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 #ifndef OPENSSL_NO_TLSEXT
 148 static int ssl3_check_finished(SSL *s);
 149 #endif
 150
 151 #ifndef OPENSSL_NO_ECDH
 152 static int curve_id2nid(int curve_id);
 153 int check_srvr_ecc_cert_and_alg(X509 *x, SSL_CIPHER *cs);
 154 #endif
 155
 156 static SSL_METHOD *ssl3_get_client_method(int ver)
 157         {
 158         if (ver == SSL3_VERSION)
 159                 return(SSLv3_client_method());
 160         else
 161                 return(NULL);
 162         }
 163
 164 IMPLEMENT_ssl3_meth_func(SSLv3_client_method,
 165                         ssl_undefined_function,
 166                         ssl3_connect,
 167                         ssl3_get_client_method)
 168
 169 int ssl3_connect(SSL *s)
 170         {
 171         BUF_MEM *buf=NULL;
 172         unsigned long Time=(unsigned long)time(NULL),l;
 173         long num1;
 174         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 175         int ret= -1;
 176         int new_state,state,skip=0;
 177
 178         RAND_add(&Time,sizeof(Time),0);
 179         ERR_clear_error();
 180         clear_sys_error();
 181
 182         if (s->info_callback != NULL)
 183                 cb=s->info_callback;
 184         else if (s->ctx->info_callback != NULL)
 185                 cb=s->ctx->info_callback;
 186
 187         s->in_handshake++;
 188         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 189
 190         for (;;)
 191                 {
 192                 state=s->state;
 193
 194                 switch(s->state)
 195                         {
 196                 case SSL_ST_RENEGOTIATE:
 197                         s->new_session=1;
 198                         s->state=SSL_ST_CONNECT;
 199                         s->ctx->stats.sess_connect_renegotiate++;
 200                         /* break */
 201                 case SSL_ST_BEFORE:
 202                 case SSL_ST_CONNECT:
 203                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 204                 case SSL_ST_OK|SSL_ST_CONNECT:
 205
 206                         s->server=0;
 207                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 208
 209                         if ((s->version & 0xff00 ) != 0x0300)
 210                                 {
 211                                 SSLerr(SSL_F_SSL3_CONNECT, ERR_R_INTERNAL_ERROR);
 212                                 ret = -1;
 213                                 goto end;
 214                                 }
 215
 216                         /* s->version=SSL3_VERSION; */
 217                         s->type=SSL_ST_CONNECT;
 218
 219                         if (s->init_buf == NULL)
 220                                 {
 221                                 if ((buf=BUF_MEM_new()) == NULL)
 222                                         {
 223                                         ret= -1;
 224                                         goto end;
 225                                         }
 226                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 227                                         {
 228                                         ret= -1;
 229                                         goto end;
 230                                         }
 231                                 s->init_buf=buf;
 232                                 buf=NULL;
 233                                 }
 234
 235                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
 236
 237                         /* setup buffing BIO */
 238                         if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
 239
 240                         /* don't push the buffering BIO quite yet */
 241
 242                         ssl3_init_finished_mac(s);
 243
 244                         s->state=SSL3_ST_CW_CLNT_HELLO_A;
 245                         s->ctx->stats.sess_connect++;
 246                         s->init_num=0;
 247                         break;
 248
 249                 case SSL3_ST_CW_CLNT_HELLO_A:
 250                 case SSL3_ST_CW_CLNT_HELLO_B:
 251
 252                         s->shutdown=0;
 253                         ret=ssl3_client_hello(s);
 254                         if (ret <= 0) goto end;
 255                         s->state=SSL3_ST_CR_SRVR_HELLO_A;
 256                         s->init_num=0;
 257
 258                         /* turn on buffering for the next lot of output */
 259                         if (s->bbio != s->wbio)
 260                                 s->wbio=BIO_push(s->bbio,s->wbio);
 261
 262                         break;
 263
 264                 case SSL3_ST_CR_SRVR_HELLO_A:
 265                 case SSL3_ST_CR_SRVR_HELLO_B:
 266                         ret=ssl3_get_server_hello(s);
 267                         if (ret <= 0) goto end;
 268                         if (s->hit)
 269                                 s->state=SSL3_ST_CR_FINISHED_A;
 270                         else
 271                                 s->state=SSL3_ST_CR_CERT_A;
 272                         s->init_num=0;
 273                         break;
 274
 275                 case SSL3_ST_CR_CERT_A:
 276                 case SSL3_ST_CR_CERT_B:
 277 #ifndef OPENSSL_NO_TLSEXT
 278                         ret=ssl3_check_finished(s);
 279                         if (ret <= 0) goto end;
 280                         if (ret == 2)
 281                                 {
 282                                 s->hit = 1;
 283                                 if (s->tlsext_ticket_expected)
 284                                         s->state=SSL3_ST_CR_SESSION_TICKET_A;
 285                                 else
 286                                         s->state=SSL3_ST_CR_FINISHED_A;
 287                                 s->init_num=0;
 288                                 break;
 289                                 }
 290 #endif
 291                         /* Check if it is anon DH/ECDH */
 292                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 293                                 {
 294                                 ret=ssl3_get_server_certificate(s);
 295                                 if (ret <= 0) goto end;
 296 #ifndef OPENSSL_NO_TLSEXT
 297                                 if (s->tlsext_status_expected)
 298                                         s->state=SSL3_ST_CR_CERT_STATUS_A;
 299                                 else
 300                                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 301                                 }
 302                         else
 303                                 {
 304                                 skip = 1;
 305                                 s->state=SSL3_ST_CR_KEY_EXCH_A;
 306                                 }
 307 #else
 308                                 }
 309                         else
 310                                 skip=1;
 311
 312                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 313 #endif
 314                         s->init_num=0;
 315                         break;
 316
 317                 case SSL3_ST_CR_KEY_EXCH_A:
 318                 case SSL3_ST_CR_KEY_EXCH_B:
 319                         ret=ssl3_get_key_exchange(s);
 320                         if (ret <= 0) goto end;
 321                         s->state=SSL3_ST_CR_CERT_REQ_A;
 322                         s->init_num=0;
 323
 324                         /* at this point we check that we have the
 325                          * required stuff from the server */
 326                         if (!ssl3_check_cert_and_algorithm(s))
 327                                 {
 328                                 ret= -1;
 329                                 goto end;
 330                                 }
 331                         break;
 332
 333                 case SSL3_ST_CR_CERT_REQ_A:
 334                 case SSL3_ST_CR_CERT_REQ_B:
 335                         ret=ssl3_get_certificate_request(s);
 336                         if (ret <= 0) goto end;
 337                         s->state=SSL3_ST_CR_SRVR_DONE_A;
 338                         s->init_num=0;
 339                         break;
 340
 341                 case SSL3_ST_CR_SRVR_DONE_A:
 342                 case SSL3_ST_CR_SRVR_DONE_B:
 343                         ret=ssl3_get_server_done(s);
 344                         if (ret <= 0) goto end;
 345                         if (s->s3->tmp.cert_req)
 346                                 s->state=SSL3_ST_CW_CERT_A;
 347                         else
 348                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
 349                         s->init_num=0;
 350
 351                         break;
 352
 353                 case SSL3_ST_CW_CERT_A:
 354                 case SSL3_ST_CW_CERT_B:
 355                 case SSL3_ST_CW_CERT_C:
 356                 case SSL3_ST_CW_CERT_D:
 357                         ret=ssl3_send_client_certificate(s);
 358                         if (ret <= 0) goto end;
 359                         s->state=SSL3_ST_CW_KEY_EXCH_A;
 360                         s->init_num=0;
 361                         break;
 362
 363                 case SSL3_ST_CW_KEY_EXCH_A:
 364                 case SSL3_ST_CW_KEY_EXCH_B:
 365                         ret=ssl3_send_client_key_exchange(s);
 366                         if (ret <= 0) goto end;
 367                         l=s->s3->tmp.new_cipher->algorithms;
 368                         /* EAY EAY EAY need to check for DH fix cert
 369                          * sent back */
 370                         /* For TLS, cert_req is set to 2, so a cert chain
 371                          * of nothing is sent, but no verify packet is sent */
 372                         /* XXX: For now, we do not support client
 373                          * authentication in ECDH cipher suites with
 374                          * ECDH (rather than ECDSA) certificates.
 375                          * We need to skip the certificate verify
 376                          * message when client's ECDH public key is sent
 377                          * inside the client certificate.
 378                          */
 379                         if (s->s3->tmp.cert_req == 1)
 380                                 {
 381                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
 382                                 }
 383                         else
 384                                 {
 385                                 s->state=SSL3_ST_CW_CHANGE_A;
 386                                 s->s3->change_cipher_spec=0;
 387                                 }
 388
 389                         s->init_num=0;
 390                         break;
 391
 392                 case SSL3_ST_CW_CERT_VRFY_A:
 393                 case SSL3_ST_CW_CERT_VRFY_B:
 394                         ret=ssl3_send_client_verify(s);
 395                         if (ret <= 0) goto end;
 396                         s->state=SSL3_ST_CW_CHANGE_A;
 397                         s->init_num=0;
 398                         s->s3->change_cipher_spec=0;
 399                         break;
 400
 401                 case SSL3_ST_CW_CHANGE_A:
 402                 case SSL3_ST_CW_CHANGE_B:
 403                         ret=ssl3_send_change_cipher_spec(s,
 404                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
 405                         if (ret <= 0) goto end;
 406                         s->state=SSL3_ST_CW_FINISHED_A;
 407                         s->init_num=0;
 408
 409                         s->session->cipher=s->s3->tmp.new_cipher;
 410 #ifdef OPENSSL_NO_COMP
 411                         s->session->compress_meth=0;
 412 #else
 413                         if (s->s3->tmp.new_compression == NULL)
 414                                 s->session->compress_meth=0;
 415                         else
 416                                 s->session->compress_meth=
 417                                         s->s3->tmp.new_compression->id;
 418 #endif
 419                         if (!s->method->ssl3_enc->setup_key_block(s))
 420                                 {
 421                                 ret= -1;
 422                                 goto end;
 423                                 }
 424
 425                         if (!s->method->ssl3_enc->change_cipher_state(s,
 426                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 427                                 {
 428                                 ret= -1;
 429                                 goto end;
 430                                 }
 431
 432                         break;
 433
 434                 case SSL3_ST_CW_FINISHED_A:
 435                 case SSL3_ST_CW_FINISHED_B:
 436                         ret=ssl3_send_finished(s,
 437                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
 438                                 s->method->ssl3_enc->client_finished_label,
 439                                 s->method->ssl3_enc->client_finished_label_len);
 440                         if (ret <= 0) goto end;
 441                         s->state=SSL3_ST_CW_FLUSH;
 442
 443                         /* clear flags */
 444                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
 445                         if (s->hit)
 446                                 {
 447                                 s->s3->tmp.next_state=SSL_ST_OK;
 448                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
 449                                         {
 450                                         s->state=SSL_ST_OK;
 451                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
 452                                         s->s3->delay_buf_pop_ret=0;
 453                                         }
 454                                 }
 455                         else
 456                                 {
 457 #ifndef OPENSSL_NO_TLSEXT
 458                                 /* Allow NewSessionTicket if ticket expected */
 459                                 if (s->tlsext_ticket_expected)
 460                                         s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A;
 461                                 else
 462 #endif
 463
 464                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
 465                                 }
 466                         s->init_num=0;
 467                         break;
 468
 469 #ifndef OPENSSL_NO_TLSEXT
 470                 case SSL3_ST_CR_SESSION_TICKET_A:
 471                 case SSL3_ST_CR_SESSION_TICKET_B:
 472                         ret=ssl3_get_new_session_ticket(s);
 473                         if (ret <= 0) goto end;
 474                         s->state=SSL3_ST_CR_FINISHED_A;
 475                         s->init_num=0;
 476                 break;
 477
 478                 case SSL3_ST_CR_CERT_STATUS_A:
 479                 case SSL3_ST_CR_CERT_STATUS_B:
 480                         ret=ssl3_get_cert_status(s);
 481                         if (ret <= 0) goto end;
 482                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 483                         s->init_num=0;
 484                 break;
 485 #endif
 486
 487                 case SSL3_ST_CR_FINISHED_A:
 488                 case SSL3_ST_CR_FINISHED_B:
 489
 490                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
 491                                 SSL3_ST_CR_FINISHED_B);
 492                         if (ret <= 0) goto end;
 493
 494                         if (s->hit)
 495                                 s->state=SSL3_ST_CW_CHANGE_A;
 496                         else
 497                                 s->state=SSL_ST_OK;
 498                         s->init_num=0;
 499                         break;
 500
 501                 case SSL3_ST_CW_FLUSH:
 502                         /* number of bytes to be flushed */
 503                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 504                         if (num1 > 0)
 505                                 {
 506                                 s->rwstate=SSL_WRITING;
 507                                 num1=BIO_flush(s->wbio);
 508                                 if (num1 <= 0) { ret= -1; goto end; }
 509                                 s->rwstate=SSL_NOTHING;
 510                                 }
 511
 512                         s->state=s->s3->tmp.next_state;
 513                         break;
 514
 515                 case SSL_ST_OK:
 516                         /* clean a few things up */
 517                         ssl3_cleanup_key_block(s);
 518
 519                         if (s->init_buf != NULL)
 520                                 {
 521                                 BUF_MEM_free(s->init_buf);
 522                                 s->init_buf=NULL;
 523                                 }
 524
 525                         /* If we are not 'joining' the last two packets,
 526                          * remove the buffering now */
 527                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 528                                 ssl_free_wbio_buffer(s);
 529                         /* else do it later in ssl3_write */
 530
 531                         s->init_num=0;
 532                         s->new_session=0;
 533
 534                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 535                         if (s->hit) s->ctx->stats.sess_hit++;
 536
 537                         ret=1;
 538                         /* s->server=0; */
 539                         s->handshake_func=ssl3_connect;
 540                         s->ctx->stats.sess_connect_good++;
 541
 542                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 543
 544                         goto end;
 545                         /* break; */
 546
 547                 default:
 548                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_UNKNOWN_STATE);
 549                         ret= -1;
 550                         goto end;
 551                         /* break; */
 552                         }
 553
 554                 /* did we do anything */
 555                 if (!s->s3->tmp.reuse_message && !skip)
 556                         {
 557                         if (s->debug)
 558                                 {
 559                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 560                                         goto end;
 561                                 }
 562
 563                         if ((cb != NULL) && (s->state != state))
 564                                 {
 565                                 new_state=s->state;
 566                                 s->state=state;
 567                                 cb(s,SSL_CB_CONNECT_LOOP,1);
 568                                 s->state=new_state;
 569                                 }
 570                         }
 571                 skip=0;
 572                 }
 573 end:
 574         s->in_handshake--;
 575         if (buf != NULL)
 576                 BUF_MEM_free(buf);
 577         if (cb != NULL)
 578                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 579         return(ret);
 580         }
 581
 582
 583 int ssl3_client_hello(SSL *s)
 584         {
 585         unsigned char *buf;
 586         unsigned char *p,*d;
 587         int i;
 588         unsigned long Time,l;
 589 #ifndef OPENSSL_NO_COMP
 590         int j;
 591         SSL_COMP *comp;
 592 #endif
 593
 594         buf=(unsigned char *)s->init_buf->data;
 595         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
 596                 {
 597                 SSL_SESSION *sess = s->session;
 598                 if ((sess == NULL) ||
 599                         (sess->ssl_version != s->version) ||
 600 #ifdef OPENSSL_NO_TLSEXT
 601                         !sess->session_id_length ||
 602 #else
 603                         (!sess->session_id_length && !sess->tlsext_tick) ||
 604 #endif
 605                         (sess->not_resumable))
 606                         {
 607                         if (!ssl_get_new_session(s,0))
 608                                 goto err;
 609                         }
 610                 /* else use the pre-loaded session */
 611
 612                 p=s->s3->client_random;
 613                 Time=(unsigned long)time(NULL);                 /* Time */
 614                 l2n(Time,p);
 615                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
 616                         goto err;
 617
 618                 /* Do the message type and length last */
 619                 d=p= &(buf[4]);
 620
 621                 *(p++)=s->version>>8;
 622                 *(p++)=s->version&0xff;
 623                 s->client_version=s->version;
 624
 625                 /* Random stuff */
 626                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 627                 p+=SSL3_RANDOM_SIZE;
 628
 629                 /* Session ID */
 630                 if (s->new_session)
 631                         i=0;
 632                 else
 633                         i=s->session->session_id_length;
 634                 *(p++)=i;
 635                 if (i != 0)
 636                         {
 637                         if (i > (int)sizeof(s->session->session_id))
 638                                 {
 639                                 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 640                                 goto err;
 641                                 }
 642                         memcpy(p,s->session->session_id,i);
 643                         p+=i;
 644                         }
 645
 646                 /* Ciphers supported */
 647                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
 648                 if (i == 0)
 649                         {
 650                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 651                         goto err;
 652                         }
 653                 s2n(i,p);
 654                 p+=i;
 655
 656                 /* COMPRESSION */
 657 #ifdef OPENSSL_NO_COMP
 658                 *(p++)=1;
 659 #else
 660                 if (s->ctx->comp_methods == NULL)
 661                         j=0;
 662                 else
 663                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
 664                 *(p++)=1+j;
 665                 for (i=0; i<j; i++)
 666                         {
 667                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
 668                         *(p++)=comp->id;
 669                         }
 670 #endif
 671                 *(p++)=0; /* Add the NULL method */
 672 #ifndef OPENSSL_NO_TLSEXT
 673                 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
 674                         {
 675                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
 676                         goto err;
 677                         }
 678 #endif
 679                 l=(p-d);
 680                 d=buf;
 681                 *(d++)=SSL3_MT_CLIENT_HELLO;
 682                 l2n3(l,d);
 683
 684                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 685                 /* number of bytes to write */
 686                 s->init_num=p-buf;
 687                 s->init_off=0;
 688                 }
 689
 690         /* SSL3_ST_CW_CLNT_HELLO_B */
 691         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 692 err:
 693         return(-1);
 694         }
 695
 696 int ssl3_get_server_hello(SSL *s)
 697         {
 698         STACK_OF(SSL_CIPHER) *sk;
 699         SSL_CIPHER *c;
 700         unsigned char *p,*d;
 701         int i,al,ok;
 702         unsigned int j;
 703         long n;
 704 #ifndef OPENSSL_NO_COMP
 705         SSL_COMP *comp;
 706 #endif
 707
 708         n=s->method->ssl_get_message(s,
 709                 SSL3_ST_CR_SRVR_HELLO_A,
 710                 SSL3_ST_CR_SRVR_HELLO_B,
 711                 -1,
 712                 20000, /* ?? */
 713                 &ok);
 714
 715         if (!ok) return((int)n);
 716
 717         if ( SSL_version(s) == DTLS1_VERSION || SSL_version(s) == DTLS1_BAD_VER)
 718                 {
 719                 if ( s->s3->tmp.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST)
 720                         {
 721                         if ( s->d1->send_cookie == 0)
 722                                 {
 723                                 s->s3->tmp.reuse_message = 1;
 724                                 return 1;
 725                                 }
 726                         else /* already sent a cookie */
 727                                 {
 728                                 al=SSL_AD_UNEXPECTED_MESSAGE;
 729                                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
 730                                 goto f_err;
 731                                 }
 732                         }
 733                 }
 734
 735         if ( s->s3->tmp.message_type != SSL3_MT_SERVER_HELLO)
 736                 {
 737                 al=SSL_AD_UNEXPECTED_MESSAGE;
 738                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
 739                 goto f_err;
 740                 }
 741
 742         d=p=(unsigned char *)s->init_msg;
 743
 744         if ((p[0] != (s->version>>8)) || (p[1] != (s->version&0xff)))
 745                 {
 746                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
 747                 s->version=(s->version&0xff00)|p[1];
 748                 al=SSL_AD_PROTOCOL_VERSION;
 749                 goto f_err;
 750                 }
 751         p+=2;
 752
 753         /* load the server hello data */
 754         /* load the server random */
 755         memcpy(s->s3->server_random,p,SSL3_RANDOM_SIZE);
 756         p+=SSL3_RANDOM_SIZE;
 757
 758         /* get the session-id */
 759         j= *(p++);
 760
 761         if ((j > sizeof s->session->session_id) || (j > SSL3_SESSION_ID_SIZE))
 762                 {
 763                 al=SSL_AD_ILLEGAL_PARAMETER;
 764                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_LONG);
 765                 goto f_err;
 766                 }
 767
 768         if (j != 0 && j == s->session->session_id_length
 769             && memcmp(p,s->session->session_id,j) == 0)
 770             {
 771             if(s->sid_ctx_length != s->session->sid_ctx_length
 772                || memcmp(s->session->sid_ctx,s->sid_ctx,s->sid_ctx_length))
 773                 {
 774                 /* actually a client application bug */
 775                 al=SSL_AD_ILLEGAL_PARAMETER;
 776                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
 777                 goto f_err;
 778                 }
 779             s->hit=1;
 780             }
 781         else    /* a miss or crap from the other end */
 782                 {
 783                 /* If we were trying for session-id reuse, make a new
 784                  * SSL_SESSION so we don't stuff up other people */
 785                 s->hit=0;
 786                 if (s->session->session_id_length > 0)
 787                         {
 788                         if (!ssl_get_new_session(s,0))
 789                                 {
 790                                 al=SSL_AD_INTERNAL_ERROR;
 791                                 goto f_err;
 792                                 }
 793                         }
 794                 s->session->session_id_length=j;
 795                 memcpy(s->session->session_id,p,j); /* j could be 0 */
 796                 }
 797         p+=j;
 798         c=ssl_get_cipher_by_char(s,p);
 799         if (c == NULL)
 800                 {
 801                 /* unknown cipher */
 802                 al=SSL_AD_ILLEGAL_PARAMETER;
 803                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNKNOWN_CIPHER_RETURNED);
 804                 goto f_err;
 805                 }
 806         p+=ssl_put_cipher_by_char(s,NULL,NULL);
 807
 808         sk=ssl_get_ciphers_by_id(s);
 809         i=sk_SSL_CIPHER_find(sk,c);
 810         if (i < 0)
 811                 {
 812                 /* we did not say we would use this cipher */
 813                 al=SSL_AD_ILLEGAL_PARAMETER;
 814                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
 815                 goto f_err;
 816                 }
 817
 818         /* Depending on the session caching (internal/external), the cipher
 819            and/or cipher_id values may not be set. Make sure that
 820            cipher_id is set and use it for comparison. */
 821         if (s->session->cipher)
 822                 s->session->cipher_id = s->session->cipher->id;
 823         if (s->hit && (s->session->cipher_id != c->id))
 824                 {
 825                 if (!(s->options &
 826                         SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
 827                         {
 828                         al=SSL_AD_ILLEGAL_PARAMETER;
 829                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
 830                         goto f_err;
 831                         }
 832                 }
 833         s->s3->tmp.new_cipher=c;
 834
 835         /* lets get the compression algorithm */
 836         /* COMPRESSION */
 837 #ifdef OPENSSL_NO_COMP
 838         if (*(p++) != 0)
 839                 {
 840                 al=SSL_AD_ILLEGAL_PARAMETER;
 841                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
 842                 goto f_err;
 843                 }
 844 #else
 845         j= *(p++);
 846         if (j == 0)
 847                 comp=NULL;
 848         else
 849                 comp=ssl3_comp_find(s->ctx->comp_methods,j);
 850
 851         if ((j != 0) && (comp == NULL))
 852                 {
 853                 al=SSL_AD_ILLEGAL_PARAMETER;
 854                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
 855                 goto f_err;
 856                 }
 857         else
 858                 {
 859                 s->s3->tmp.new_compression=comp;
 860                 }
 861 #endif
 862 #ifndef OPENSSL_NO_TLSEXT
 863         /* TLS extensions*/
 864         if (s->version > SSL3_VERSION && s->version != DTLS1_VERSION && s->version != DTLS1_BAD_VER)
 865                 {
 866                 if (!ssl_parse_serverhello_tlsext(s,&p,d,n, &al))
 867                         {
 868                         /* 'al' set by ssl_parse_serverhello_tlsext */
 869                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_PARSE_TLSEXT);
 870                         goto f_err;
 871                         }
 872                 if (ssl_check_serverhello_tlsext(s) <= 0)
 873                         {
 874                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
 875                                 goto err;
 876                         }
 877                 }
 878
 879         /* DTLS extensions */
 880         if (s->version == DTLS1_VERSION || s->version == DTLS1_BAD_VER)
 881         {
 882                 if (!ssl_parse_serverhello_dtlsext(s,&p,d,n, &al))
 883                 {
 884                         /* 'al' set by ssl_parse_serverhello_dtlsext */
 885                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_PARSE_TLSEXT);
 886                         goto f_err;
 887                 }
 888         }
 889 #endif
 890
 891
 892         if (p != (d+n))
 893                 {
 894                 /* wrong packet length */
 895                 al=SSL_AD_DECODE_ERROR;
 896                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
 897                 goto err;
 898                 }
 899
 900         return(1);
 901 f_err:
 902         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 903 err:
 904         return(-1);
 905         }
 906
 907 int ssl3_get_server_certificate(SSL *s)
 908         {
 909         int al,i,ok,ret= -1;
 910         unsigned long n,nc,llen,l;
 911         X509 *x=NULL;
 912         const unsigned char *q,*p;
 913         unsigned char *d;
 914         STACK_OF(X509) *sk=NULL;
 915         SESS_CERT *sc;
 916         EVP_PKEY *pkey=NULL;
 917         int need_cert = 1; /* VRS: 0=> will allow null cert if auth == KRB5 */
 918
 919         n=s->method->ssl_get_message(s,
 920                 SSL3_ST_CR_CERT_A,
 921                 SSL3_ST_CR_CERT_B,
 922                 -1,
 923                 s->max_cert_list,
 924                 &ok);
 925
 926         if (!ok) return((int)n);
 927
 928         if ((s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) ||
 929                 ((s->s3->tmp.new_cipher->algorithms & SSL_aKRB5) &&
 930                 (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)))
 931                 {
 932                 s->s3->tmp.reuse_message=1;
 933                 return(1);
 934                 }
 935
 936         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
 937                 {
 938                 al=SSL_AD_UNEXPECTED_MESSAGE;
 939                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
 940                 goto f_err;
 941                 }
 942         p=d=(unsigned char *)s->init_msg;
 943
 944         if ((sk=sk_X509_new_null()) == NULL)
 945                 {
 946                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
 947                 goto err;
 948                 }
 949
 950         n2l3(p,llen);
 951         if (llen+3 != n)
 952                 {
 953                 al=SSL_AD_DECODE_ERROR;
 954                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
 955                 goto f_err;
 956                 }
 957         for (nc=0; nc<llen; )
 958                 {
 959                 n2l3(p,l);
 960                 if ((l+nc+3) > llen)
 961                         {
 962                         al=SSL_AD_DECODE_ERROR;
 963                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
 964                         goto f_err;
 965                         }
 966
 967                 q=p;
 968                 x=d2i_X509(NULL,&q,l);
 969                 if (x == NULL)
 970                         {
 971                         al=SSL_AD_BAD_CERTIFICATE;
 972                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
 973                         goto f_err;
 974                         }
 975                 if (q != (p+l))
 976                         {
 977                         al=SSL_AD_DECODE_ERROR;
 978                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
 979                         goto f_err;
 980                         }
 981                 if (!sk_X509_push(sk,x))
 982                         {
 983                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
 984                         goto err;
 985                         }
 986                 x=NULL;
 987                 nc+=l+3;
 988                 p=q;
 989                 }
 990
 991         i=ssl_verify_cert_chain(s,sk);
 992         if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0)
 993 #ifndef OPENSSL_NO_KRB5
 994                 && (s->s3->tmp.new_cipher->algorithms & (SSL_MKEY_MASK|SSL_AUTH_MASK))
 995                 != (SSL_aKRB5|SSL_kKRB5)
 996 #endif /* OPENSSL_NO_KRB5 */
 997                 )
 998                 {
 999                 al=ssl_verify_alarm_type(s->verify_result);
1000                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
1001                 goto f_err;
1002                 }
1003         ERR_clear_error(); /* but we keep s->verify_result */
1004
1005         sc=ssl_sess_cert_new();
1006         if (sc == NULL) goto err;
1007
1008         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
1009         s->session->sess_cert=sc;
1010
1011         sc->cert_chain=sk;
1012         /* Inconsistency alert: cert_chain does include the peer's
1013          * certificate, which we don't include in s3_srvr.c */
1014         x=sk_X509_value(sk,0);
1015         sk=NULL;
1016         /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/
1017
1018         pkey=X509_get_pubkey(x);
1019
1020         /* VRS: allow null cert if auth == KRB5 */
1021         need_cert =     ((s->s3->tmp.new_cipher->algorithms
1022                          & (SSL_MKEY_MASK|SSL_AUTH_MASK))
1023                          == (SSL_aKRB5|SSL_kKRB5))? 0: 1;
1024
1025 #ifdef KSSL_DEBUG
1026         printf("pkey,x = %p, %p\n", (void *)pkey,(void *)x);
1027         printf("ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x,pkey));
1028         printf("cipher, alg, nc = %s, %lx, %d\n", s->s3->tmp.new_cipher->name,
1029                 s->s3->tmp.new_cipher->algorithms, need_cert);
1030 #endif    /* KSSL_DEBUG */
1031
1032         if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey)))
1033                 {
1034                 x=NULL;
1035                 al=SSL3_AL_FATAL;
1036                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1037                         SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
1038                 goto f_err;
1039                 }
1040
1041         i=ssl_cert_type(x,pkey);
1042         if (need_cert && i < 0)
1043                 {
1044                 x=NULL;
1045                 al=SSL3_AL_FATAL;
1046                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1047                         SSL_R_UNKNOWN_CERTIFICATE_TYPE);
1048                 goto f_err;
1049                 }
1050
1051         if (need_cert)
1052                 {
1053                 sc->peer_cert_type=i;
1054                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1055                 /* Why would the following ever happen?
1056                  * We just created sc a couple of lines ago. */
1057                 if (sc->peer_pkeys[i].x509 != NULL)
1058                         X509_free(sc->peer_pkeys[i].x509);
1059                 sc->peer_pkeys[i].x509=x;
1060                 sc->peer_key= &(sc->peer_pkeys[i]);
1061
1062                 if (s->session->peer != NULL)
1063                         X509_free(s->session->peer);
1064                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1065                 s->session->peer=x;
1066                 }
1067         else
1068                 {
1069                 sc->peer_cert_type=i;
1070                 sc->peer_key= NULL;
1071
1072                 if (s->session->peer != NULL)
1073                         X509_free(s->session->peer);
1074                 s->session->peer=NULL;
1075                 }
1076         s->session->verify_result = s->verify_result;
1077
1078         x=NULL;
1079         ret=1;
1080
1081         if (0)
1082                 {
1083 f_err:
1084                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1085                 }
1086 err:
1087         EVP_PKEY_free(pkey);
1088         X509_free(x);
1089         sk_X509_pop_free(sk,X509_free);
1090         return(ret);
1091         }
1092
1093 int ssl3_get_key_exchange(SSL *s)
1094         {
1095 #ifndef OPENSSL_NO_RSA
1096         unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
1097 #endif
1098         EVP_MD_CTX md_ctx;
1099         unsigned char *param,*p;
1100         int al,i,j,param_len,ok;
1101         long n,alg;
1102         EVP_PKEY *pkey=NULL;
1103 #ifndef OPENSSL_NO_RSA
1104         RSA *rsa=NULL;
1105 #endif
1106 #ifndef OPENSSL_NO_DH
1107         DH *dh=NULL;
1108 #endif
1109 #ifndef OPENSSL_NO_ECDH
1110         EC_KEY *ecdh = NULL;
1111         BN_CTX *bn_ctx = NULL;
1112         EC_POINT *srvr_ecpoint = NULL;
1113         int curve_nid = 0;
1114         int encoded_pt_len = 0;
1115 #endif
1116
1117         /* use same message size as in ssl3_get_certificate_request()
1118          * as ServerKeyExchange message may be skipped */
1119         n=s->method->ssl_get_message(s,
1120                 SSL3_ST_CR_KEY_EXCH_A,
1121                 SSL3_ST_CR_KEY_EXCH_B,
1122                 -1,
1123                 s->max_cert_list,
1124                 &ok);
1125
1126         if (!ok) return((int)n);
1127
1128         if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
1129                 {
1130                 s->s3->tmp.reuse_message=1;
1131                 return(1);
1132                 }
1133
1134         param=p=(unsigned char *)s->init_msg;
1135
1136         if (s->session->sess_cert != NULL)
1137                 {
1138 #ifndef OPENSSL_NO_RSA
1139                 if (s->session->sess_cert->peer_rsa_tmp != NULL)
1140                         {
1141                         RSA_free(s->session->sess_cert->peer_rsa_tmp);
1142                         s->session->sess_cert->peer_rsa_tmp=NULL;
1143                         }
1144 #endif
1145 #ifndef OPENSSL_NO_DH
1146                 if (s->session->sess_cert->peer_dh_tmp)
1147                         {
1148                         DH_free(s->session->sess_cert->peer_dh_tmp);
1149                         s->session->sess_cert->peer_dh_tmp=NULL;
1150                         }
1151 #endif
1152 #ifndef OPENSSL_NO_ECDH
1153                 if (s->session->sess_cert->peer_ecdh_tmp)
1154                         {
1155                         EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp);
1156                         s->session->sess_cert->peer_ecdh_tmp=NULL;
1157                         }
1158 #endif
1159                 }
1160         else
1161                 {
1162                 s->session->sess_cert=ssl_sess_cert_new();
1163                 }
1164
1165         param_len=0;
1166         alg=s->s3->tmp.new_cipher->algorithms;
1167         EVP_MD_CTX_init(&md_ctx);
1168
1169 #ifndef OPENSSL_NO_RSA
1170         if (alg & SSL_kRSA)
1171                 {
1172                 if ((rsa=RSA_new()) == NULL)
1173                         {
1174                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1175                         goto err;
1176                         }
1177                 n2s(p,i);
1178                 param_len=i+2;
1179                 if (param_len > n)
1180                         {
1181                         al=SSL_AD_DECODE_ERROR;
1182                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
1183                         goto f_err;
1184                         }
1185                 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
1186                         {
1187                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1188                         goto err;
1189                         }
1190                 p+=i;
1191
1192                 n2s(p,i);
1193                 param_len+=i+2;
1194                 if (param_len > n)
1195                         {
1196                         al=SSL_AD_DECODE_ERROR;
1197                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
1198                         goto f_err;
1199                         }
1200                 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
1201                         {
1202                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1203                         goto err;
1204                         }
1205                 p+=i;
1206                 n-=param_len;
1207
1208                 /* this should be because we are using an export cipher */
1209                 if (alg & SSL_aRSA)
1210                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1211                 else
1212                         {
1213                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1214                         goto err;
1215                         }
1216                 s->session->sess_cert->peer_rsa_tmp=rsa;
1217                 rsa=NULL;
1218                 }
1219 #else /* OPENSSL_NO_RSA */
1220         if (0)
1221                 ;
1222 #endif
1223 #ifndef OPENSSL_NO_DH
1224         else if (alg & SSL_kEDH)
1225                 {
1226                 if ((dh=DH_new()) == NULL)
1227                         {
1228                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
1229                         goto err;
1230                         }
1231                 n2s(p,i);
1232                 param_len=i+2;
1233                 if (param_len > n)
1234                         {
1235                         al=SSL_AD_DECODE_ERROR;
1236                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
1237                         goto f_err;
1238                         }
1239                 if (!(dh->p=BN_bin2bn(p,i,NULL)))
1240                         {
1241                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1242                         goto err;
1243                         }
1244                 p+=i;
1245
1246                 n2s(p,i);
1247                 param_len+=i+2;
1248                 if (param_len > n)
1249                         {
1250                         al=SSL_AD_DECODE_ERROR;
1251                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
1252                         goto f_err;
1253                         }
1254                 if (!(dh->g=BN_bin2bn(p,i,NULL)))
1255                         {
1256                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1257                         goto err;
1258                         }
1259                 p+=i;
1260
1261                 n2s(p,i);
1262                 param_len+=i+2;
1263                 if (param_len > n)
1264                         {
1265                         al=SSL_AD_DECODE_ERROR;
1266                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
1267                         goto f_err;
1268                         }
1269                 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
1270                         {
1271                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1272                         goto err;
1273                         }
1274                 p+=i;
1275                 n-=param_len;
1276
1277 #ifndef OPENSSL_NO_RSA
1278                 if (alg & SSL_aRSA)
1279                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1280 #else
1281                 if (0)
1282                         ;
1283 #endif
1284 #ifndef OPENSSL_NO_DSA
1285                 else if (alg & SSL_aDSS)
1286                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1287 #endif
1288                 /* else anonymous DH, so no certificate or pkey. */
1289
1290                 s->session->sess_cert->peer_dh_tmp=dh;
1291                 dh=NULL;
1292                 }
1293         else if ((alg & SSL_kDHr) || (alg & SSL_kDHd))
1294                 {
1295                 al=SSL_AD_ILLEGAL_PARAMETER;
1296                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1297                 goto f_err;
1298                 }
1299 #endif /* !OPENSSL_NO_DH */
1300
1301 #ifndef OPENSSL_NO_ECDH
1302         else if (alg & SSL_kECDHE)
1303                 {
1304                 EC_GROUP *ngroup;
1305                 const EC_GROUP *group;
1306
1307                 if ((ecdh=EC_KEY_new()) == NULL)
1308                         {
1309                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1310                         goto err;
1311                         }
1312
1313                 /* Extract elliptic curve parameters and the
1314                  * server's ephemeral ECDH public key.
1315                  * Keep accumulating lengths of various components in
1316                  * param_len and make sure it never exceeds n.
1317                  */
1318
1319                 /* XXX: For now we only support named (not generic) curves
1320                  * and the ECParameters in this case is just three bytes.
1321                  */
1322                 param_len=3;
1323                 if ((param_len > n) ||
1324                     (*p != NAMED_CURVE_TYPE) ||
1325                     ((curve_nid = curve_id2nid(*(p + 2))) == 0))
1326                         {
1327                         al=SSL_AD_INTERNAL_ERROR;
1328                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
1329                         goto f_err;
1330                         }
1331
1332                 ngroup = EC_GROUP_new_by_curve_name(curve_nid);
1333                 if (ngroup == NULL)
1334                         {
1335                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1336                         goto err;
1337                         }
1338                 if (EC_KEY_set_group(ecdh, ngroup) == 0)
1339                         {
1340                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1341                         goto err;
1342                         }
1343                 EC_GROUP_free(ngroup);
1344
1345                 group = EC_KEY_get0_group(ecdh);
1346
1347                 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1348                     (EC_GROUP_get_degree(group) > 163))
1349                         {
1350                         al=SSL_AD_EXPORT_RESTRICTION;
1351                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1352                         goto f_err;
1353                         }
1354
1355                 p+=3;
1356
1357                 /* Next, get the encoded ECPoint */
1358                 if (((srvr_ecpoint = EC_POINT_new(group)) == NULL) ||
1359                     ((bn_ctx = BN_CTX_new()) == NULL))
1360                         {
1361                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1362                         goto err;
1363                         }
1364
1365                 encoded_pt_len = *p;  /* length of encoded point */
1366                 p+=1;
1367                 param_len += (1 + encoded_pt_len);
1368                 if ((param_len > n) ||
1369                     (EC_POINT_oct2point(group, srvr_ecpoint,
1370                         p, encoded_pt_len, bn_ctx) == 0))
1371                         {
1372                         al=SSL_AD_DECODE_ERROR;
1373                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_ECPOINT);
1374                         goto f_err;
1375                         }
1376
1377                 n-=param_len;
1378                 p+=encoded_pt_len;
1379
1380                 /* The ECC/TLS specification does not mention
1381                  * the use of DSA to sign ECParameters in the server
1382                  * key exchange message. We do support RSA and ECDSA.
1383                  */
1384                 if (0) ;
1385 #ifndef OPENSSL_NO_RSA
1386                 else if (alg & SSL_aRSA)
1387                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1388 #endif
1389 #ifndef OPENSSL_NO_ECDSA
1390                 else if (alg & SSL_aECDSA)
1391                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1392 #endif
1393                 /* else anonymous ECDH, so no certificate or pkey. */
1394                 EC_KEY_set_public_key(ecdh, srvr_ecpoint);
1395                 s->session->sess_cert->peer_ecdh_tmp=ecdh;
1396                 ecdh=NULL;
1397                 BN_CTX_free(bn_ctx);
1398                 EC_POINT_free(srvr_ecpoint);
1399                 srvr_ecpoint = NULL;
1400                 }
1401         else if (alg & SSL_kECDH)
1402                 {
1403                 al=SSL_AD_UNEXPECTED_MESSAGE;
1404                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1405                 goto f_err;
1406                 }
1407 #endif /* !OPENSSL_NO_ECDH */
1408         if (alg & SSL_aFZA)
1409                 {
1410                 al=SSL_AD_HANDSHAKE_FAILURE;
1411                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1412                 goto f_err;
1413                 }
1414
1415
1416         /* p points to the next byte, there are 'n' bytes left */
1417
1418         /* if it was signed, check the signature */
1419         if (pkey != NULL)
1420                 {
1421                 n2s(p,i);
1422                 n-=2;
1423                 j=EVP_PKEY_size(pkey);
1424
1425                 if ((i != n) || (n > j) || (n <= 0))
1426                         {
1427                         /* wrong packet length */
1428                         al=SSL_AD_DECODE_ERROR;
1429                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1430                         goto f_err;
1431                         }
1432
1433 #ifndef OPENSSL_NO_RSA
1434                 if (pkey->type == EVP_PKEY_RSA)
1435                         {
1436                         int num;
1437
1438                         j=0;
1439                         q=md_buf;
1440                         for (num=2; num > 0; num--)
1441                                 {
1442                                 EVP_MD_CTX_set_flags(&md_ctx,
1443                                         EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1444                                 EVP_DigestInit_ex(&md_ctx,(num == 2)
1445                                         ?s->ctx->md5:s->ctx->sha1, NULL);
1446                                 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1447                                 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1448                                 EVP_DigestUpdate(&md_ctx,param,param_len);
1449                                 EVP_DigestFinal_ex(&md_ctx,q,(unsigned int *)&i);
1450                                 q+=i;
1451                                 j+=i;
1452                                 }
1453                         i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
1454                                                                 pkey->pkey.rsa);
1455                         if (i < 0)
1456                                 {
1457                                 al=SSL_AD_DECRYPT_ERROR;
1458                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1459                                 goto f_err;
1460                                 }
1461                         if (i == 0)
1462                                 {
1463                                 /* bad signature */
1464                                 al=SSL_AD_DECRYPT_ERROR;
1465                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1466                                 goto f_err;
1467                                 }
1468                         }
1469                 else
1470 #endif
1471 #ifndef OPENSSL_NO_DSA
1472                         if (pkey->type == EVP_PKEY_DSA)
1473                         {
1474                         /* lets do DSS */
1475                         EVP_VerifyInit_ex(&md_ctx,EVP_dss1(), NULL);
1476                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1477                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1478                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1479                         if (EVP_VerifyFinal(&md_ctx,p,(int)n,pkey) <= 0)
1480                                 {
1481                                 /* bad signature */
1482                                 al=SSL_AD_DECRYPT_ERROR;
1483                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1484                                 goto f_err;
1485                                 }
1486                         }
1487                 else
1488 #endif
1489 #ifndef OPENSSL_NO_ECDSA
1490                         if (pkey->type == EVP_PKEY_EC)
1491                         {
1492                         /* let's do ECDSA */
1493                         EVP_VerifyInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1494                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1495                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1496                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1497                         if (EVP_VerifyFinal(&md_ctx,p,(int)n,pkey) <= 0)
1498                                 {
1499                                 /* bad signature */
1500                                 al=SSL_AD_DECRYPT_ERROR;
1501                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1502                                 goto f_err;
1503                                 }
1504                         }
1505                 else
1506 #endif
1507                         {
1508                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1509                         goto err;
1510                         }
1511                 }
1512         else
1513                 {
1514                 /* still data left over */
1515                 if (!(alg & SSL_aNULL))
1516                         {
1517                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1518                         goto err;
1519                         }
1520                 if (n != 0)
1521                         {
1522                         al=SSL_AD_DECODE_ERROR;
1523                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
1524                         goto f_err;
1525                         }
1526                 }
1527         EVP_PKEY_free(pkey);
1528         EVP_MD_CTX_cleanup(&md_ctx);
1529         return(1);
1530 f_err:
1531         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1532 err:
1533         EVP_PKEY_free(pkey);
1534 #ifndef OPENSSL_NO_RSA
1535         if (rsa != NULL)
1536                 RSA_free(rsa);
1537 #endif
1538 #ifndef OPENSSL_NO_DH
1539         if (dh != NULL)
1540                 DH_free(dh);
1541 #endif
1542 #ifndef OPENSSL_NO_ECDH
1543         BN_CTX_free(bn_ctx);
1544         EC_POINT_free(srvr_ecpoint);
1545         if (ecdh != NULL)
1546                 EC_KEY_free(ecdh);
1547 #endif
1548         EVP_MD_CTX_cleanup(&md_ctx);
1549         return(-1);
1550         }
1551
1552 int ssl3_get_certificate_request(SSL *s)
1553         {
1554         int ok,ret=0;
1555         unsigned long n,nc,l;
1556         unsigned int llen,ctype_num,i;
1557         X509_NAME *xn=NULL;
1558         const unsigned char *p,*q;
1559         unsigned char *d;
1560         STACK_OF(X509_NAME) *ca_sk=NULL;
1561
1562         n=s->method->ssl_get_message(s,
1563                 SSL3_ST_CR_CERT_REQ_A,
1564                 SSL3_ST_CR_CERT_REQ_B,
1565                 -1,
1566                 s->max_cert_list,
1567                 &ok);
1568
1569         if (!ok) return((int)n);
1570
1571         s->s3->tmp.cert_req=0;
1572
1573         if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
1574                 {
1575                 s->s3->tmp.reuse_message=1;
1576                 return(1);
1577                 }
1578
1579         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
1580                 {
1581                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1582                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
1583                 goto err;
1584                 }
1585
1586         /* TLS does not like anon-DH with client cert */
1587         if (s->version > SSL3_VERSION)
1588                 {
1589                 l=s->s3->tmp.new_cipher->algorithms;
1590                 if (l & SSL_aNULL)
1591                         {
1592                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1593                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
1594                         goto err;
1595                         }
1596                 }
1597
1598         p=d=(unsigned char *)s->init_msg;
1599
1600         if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
1601                 {
1602                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1603                 goto err;
1604                 }
1605
1606         /* get the certificate types */
1607         ctype_num= *(p++);
1608         if (ctype_num > SSL3_CT_NUMBER)
1609                 ctype_num=SSL3_CT_NUMBER;
1610         for (i=0; i<ctype_num; i++)
1611                 s->s3->tmp.ctype[i]= p[i];
1612         p+=ctype_num;
1613
1614         /* get the CA RDNs */
1615         n2s(p,llen);
1616 #if 0
1617 {
1618 FILE *out;
1619 out=fopen("/tmp/vsign.der","w");
1620 fwrite(p,1,llen,out);
1621 fclose(out);
1622 }
1623 #endif
1624
1625         if ((llen+ctype_num+2+1) != n)
1626                 {
1627                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1628                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
1629                 goto err;
1630                 }
1631
1632         for (nc=0; nc<llen; )
1633                 {
1634                 n2s(p,l);
1635                 if ((l+nc+2) > llen)
1636                         {
1637                         if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1638                                 goto cont; /* netscape bugs */
1639                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1640                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
1641                         goto err;
1642                         }
1643
1644                 q=p;
1645
1646                 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
1647                         {
1648                         /* If netscape tolerance is on, ignore errors */
1649                         if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
1650                                 goto cont;
1651                         else
1652                                 {
1653                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1654                                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
1655                                 goto err;
1656                                 }
1657                         }
1658
1659                 if (q != (p+l))
1660                         {
1661                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1662                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
1663                         goto err;
1664                         }
1665                 if (!sk_X509_NAME_push(ca_sk,xn))
1666                         {
1667                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1668                         goto err;
1669                         }
1670
1671                 p+=l;
1672                 nc+=l+2;
1673                 }
1674
1675         if (0)
1676                 {
1677 cont:
1678                 ERR_clear_error();
1679                 }
1680
1681         /* we should setup a certificate to return.... */
1682         s->s3->tmp.cert_req=1;
1683         s->s3->tmp.ctype_num=ctype_num;
1684         if (s->s3->tmp.ca_names != NULL)
1685                 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
1686         s->s3->tmp.ca_names=ca_sk;
1687         ca_sk=NULL;
1688
1689         ret=1;
1690 err:
1691         if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
1692         return(ret);
1693         }
1694
1695 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
1696         {
1697         return(X509_NAME_cmp(*a,*b));
1698         }
1699 #ifndef OPENSSL_NO_TLSEXT
1700 int ssl3_get_new_session_ticket(SSL *s)
1701         {
1702         int ok,al,ret=0, ticklen;
1703         long n;
1704         const unsigned char *p;
1705         unsigned char *d;
1706
1707         n=s->method->ssl_get_message(s,
1708                 SSL3_ST_CR_SESSION_TICKET_A,
1709                 SSL3_ST_CR_SESSION_TICKET_B,
1710                 -1,
1711                 16384,
1712                 &ok);
1713
1714         if (!ok)
1715                 return((int)n);
1716
1717         if (s->s3->tmp.message_type == SSL3_MT_FINISHED)
1718                 {
1719                 s->s3->tmp.reuse_message=1;
1720                 return(1);
1721                 }
1722         if (s->s3->tmp.message_type != SSL3_MT_NEWSESSION_TICKET)
1723                 {
1724                 al=SSL_AD_UNEXPECTED_MESSAGE;
1725                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_BAD_MESSAGE_TYPE);
1726                 goto f_err;
1727                 }
1728         if (n < 6)
1729                 {
1730                 /* need at least ticket_lifetime_hint + ticket length */
1731                 al = SSL3_AL_FATAL,SSL_AD_DECODE_ERROR;
1732                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
1733                 goto f_err;
1734                 }
1735         p=d=(unsigned char *)s->init_msg;
1736         n2l(p, s->session->tlsext_tick_lifetime_hint);
1737         n2s(p, ticklen);
1738         /* ticket_lifetime_hint + ticket_length + ticket */
1739         if (ticklen + 6 != n)
1740                 {
1741                 al = SSL3_AL_FATAL,SSL_AD_DECODE_ERROR;
1742                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
1743                 goto f_err;
1744                 }
1745         if (s->session->tlsext_tick)
1746                 {
1747                 OPENSSL_free(s->session->tlsext_tick);
1748                 s->session->tlsext_ticklen = 0;
1749                 }
1750         s->session->tlsext_tick = OPENSSL_malloc(ticklen);
1751         if (!s->session->tlsext_tick)
1752                 {
1753                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,ERR_R_MALLOC_FAILURE);
1754                 goto err;
1755                 }
1756         memcpy(s->session->tlsext_tick, p, ticklen);
1757         s->session->tlsext_ticklen = ticklen;
1758         /* There are two ways to detect a resumed ticket sesion.
1759          * One is to set an appropriate session ID and then the server
1760          * must return a match in ServerHello. This allows the normal
1761          * client session ID matching to work and we know much
1762          * earlier that the ticket has been accepted.
1763          *
1764          * The other way is to set zero length session ID when the
1765          * ticket is presented and rely on the handshake to determine
1766          * session resumption.
1767          *
1768          * We choose the former approach because this fits in with
1769          * assumptions elsewhere in OpenSSL. The session ID is set
1770          * to the SHA256 (or SHA1 is SHA256 is disabled) hash of the
1771          * ticket.
1772          */
1773         EVP_Digest(p, ticklen,
1774                         s->session->session_id, &s->session->session_id_length,
1775 #ifndef OPENSSL_NO_SHA256
1776                                                         EVP_sha256(), NULL);
1777 #else
1778                                                         EVP_sha1(), NULL);
1779 #endif
1780         ret=1;
1781         return(ret);
1782 f_err:
1783         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1784 err:
1785         return(-1);
1786         }
1787
1788 int ssl3_get_cert_status(SSL *s)
1789         {
1790         int ok, al;
1791         unsigned long resplen;
1792         long n;
1793         const unsigned char *p;
1794
1795         n=s->method->ssl_get_message(s,
1796                 SSL3_ST_CR_CERT_STATUS_A,
1797                 SSL3_ST_CR_CERT_STATUS_B,
1798                 SSL3_MT_CERTIFICATE_STATUS,
1799                 16384,
1800                 &ok);
1801
1802         if (!ok) return((int)n);
1803         if (n < 4)
1804                 {
1805                 /* need at least status type + length */
1806                 al = SSL_AD_DECODE_ERROR;
1807                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
1808                 goto f_err;
1809                 }
1810         p = (unsigned char *)s->init_msg;
1811         if (*p++ != TLSEXT_STATUSTYPE_ocsp)
1812                 {
1813                 al = SSL_AD_DECODE_ERROR;
1814                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_UNSUPPORTED_STATUS_TYPE);
1815                 goto f_err;
1816                 }
1817         n2l3(p, resplen);
1818         if (resplen + 4 != (unsigned long)n)
1819                 {
1820                 al = SSL_AD_DECODE_ERROR;
1821                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
1822                 goto f_err;
1823                 }
1824         if (s->tlsext_ocsp_resp)
1825                 OPENSSL_free(s->tlsext_ocsp_resp);
1826         s->tlsext_ocsp_resp = BUF_memdup(p, resplen);
1827         if (!s->tlsext_ocsp_resp)
1828                 {
1829                 al = SSL_AD_INTERNAL_ERROR;
1830                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
1831                 goto f_err;
1832                 }
1833         s->tlsext_ocsp_resplen = resplen;
1834         if (s->ctx->tlsext_status_cb)
1835                 {
1836                 int ret;
1837                 ret = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
1838                 if (ret == 0)
1839                         {
1840                         al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
1841                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_INVALID_STATUS_RESPONSE);
1842                         goto f_err;
1843                         }
1844                 if (ret < 0)
1845                         {
1846                         al = SSL_AD_INTERNAL_ERROR;
1847                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
1848                         goto f_err;
1849                         }
1850                 }
1851         return 1;
1852 f_err:
1853         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1854         return(-1);
1855         }
1856 #endif
1857
1858 int ssl3_get_server_done(SSL *s)
1859         {
1860         int ok,ret=0;
1861         long n;
1862
1863         n=s->method->ssl_get_message(s,
1864                 SSL3_ST_CR_SRVR_DONE_A,
1865                 SSL3_ST_CR_SRVR_DONE_B,
1866                 SSL3_MT_SERVER_DONE,
1867                 30, /* should be very small, like 0 :-) */
1868                 &ok);
1869
1870         if (!ok) return((int)n);
1871         if (n > 0)
1872                 {
1873                 /* should contain no data */
1874                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1875                 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
1876                 return -1;
1877                 }
1878         ret=1;
1879         return(ret);
1880         }
1881
1882
1883 int ssl3_send_client_key_exchange(SSL *s)
1884         {
1885         unsigned char *p,*d;
1886         int n;
1887         unsigned long l;
1888 #ifndef OPENSSL_NO_RSA
1889         unsigned char *q;
1890         EVP_PKEY *pkey=NULL;
1891 #endif
1892 #ifndef OPENSSL_NO_KRB5
1893         KSSL_ERR kssl_err;
1894 #endif /* OPENSSL_NO_KRB5 */
1895 #ifndef OPENSSL_NO_ECDH
1896         EC_KEY *clnt_ecdh = NULL;
1897         const EC_POINT *srvr_ecpoint = NULL;
1898         EVP_PKEY *srvr_pub_pkey = NULL;
1899         unsigned char *encodedPoint = NULL;
1900         int encoded_pt_len = 0;
1901         BN_CTX * bn_ctx = NULL;
1902 #endif
1903
1904         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
1905                 {
1906                 d=(unsigned char *)s->init_buf->data;
1907                 p= &(d[4]);
1908
1909                 l=s->s3->tmp.new_cipher->algorithms;
1910
1911                 /* Fool emacs indentation */
1912                 if (0) {}
1913 #ifndef OPENSSL_NO_RSA
1914                 else if (l & SSL_kRSA)
1915                         {
1916                         RSA *rsa;
1917                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1918
1919                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
1920                                 rsa=s->session->sess_cert->peer_rsa_tmp;
1921                         else
1922                                 {
1923                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1924                                 if ((pkey == NULL) ||
1925                                         (pkey->type != EVP_PKEY_RSA) ||
1926                                         (pkey->pkey.rsa == NULL))
1927                                         {
1928                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1929                                         goto err;
1930                                         }
1931                                 rsa=pkey->pkey.rsa;
1932                                 EVP_PKEY_free(pkey);
1933                                 }
1934
1935                         tmp_buf[0]=s->client_version>>8;
1936                         tmp_buf[1]=s->client_version&0xff;
1937                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
1938                                         goto err;
1939
1940                         s->session->master_key_length=sizeof tmp_buf;
1941
1942                         q=p;
1943                         /* Fix buf for TLS and beyond */
1944                         if (s->version > SSL3_VERSION)
1945                                 p+=2;
1946                         n=RSA_public_encrypt(sizeof tmp_buf,
1947                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
1948 #ifdef PKCS1_CHECK
1949                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
1950                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
1951 #endif
1952                         if (n <= 0)
1953                                 {
1954                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
1955                                 goto err;
1956                                 }
1957
1958                         /* Fix buf for TLS and beyond */
1959                         if (s->version > SSL3_VERSION)
1960                                 {
1961                                 s2n(n,q);
1962                                 n+=2;
1963                                 }
1964
1965                         s->session->master_key_length=
1966                                 s->method->ssl3_enc->generate_master_secret(s,
1967                                         s->session->master_key,
1968                                         tmp_buf,sizeof tmp_buf);
1969                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
1970                         }
1971 #endif
1972 #ifndef OPENSSL_NO_KRB5
1973                 else if (l & SSL_kKRB5)
1974                         {
1975                         krb5_error_code krb5rc;
1976                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
1977                         /*  krb5_data   krb5_ap_req;  */
1978                         krb5_data       *enc_ticket;
1979                         krb5_data       authenticator, *authp = NULL;
1980                         EVP_CIPHER_CTX  ciph_ctx;
1981                         EVP_CIPHER      *enc = NULL;
1982                         unsigned char   iv[EVP_MAX_IV_LENGTH];
1983                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1984                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH
1985                                                 + EVP_MAX_IV_LENGTH];
1986                         int             padl, outl = sizeof(epms);
1987
1988                         EVP_CIPHER_CTX_init(&ciph_ctx);
1989
1990 #ifdef KSSL_DEBUG
1991                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
1992                                 l, SSL_kKRB5);
1993 #endif  /* KSSL_DEBUG */
1994
1995                         authp = NULL;
1996 #ifdef KRB5SENDAUTH
1997                         if (KRB5SENDAUTH)  authp = &authenticator;
1998 #endif  /* KRB5SENDAUTH */
1999
2000                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
2001                                 &kssl_err);
2002                         enc = kssl_map_enc(kssl_ctx->enctype);
2003                         if (enc == NULL)
2004                             goto err;
2005 #ifdef KSSL_DEBUG
2006                         {
2007                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
2008                         if (krb5rc && kssl_err.text)
2009                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
2010                         }
2011 #endif  /* KSSL_DEBUG */
2012
2013                         if (krb5rc)
2014                                 {
2015                                 ssl3_send_alert(s,SSL3_AL_FATAL,
2016                                                 SSL_AD_HANDSHAKE_FAILURE);
2017                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2018                                                 kssl_err.reason);
2019                                 goto err;
2020                                 }
2021
2022                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
2023                         **  in place of RFC 2712 KerberosWrapper, as in:
2024                         **
2025                         **  Send ticket (copy to *p, set n = length)
2026                         **  n = krb5_ap_req.length;
2027                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
2028                         **  if (krb5_ap_req.data)
2029                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
2030                         **
2031                         **  Now using real RFC 2712 KerberosWrapper
2032                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
2033                         **  Note: 2712 "opaque" types are here replaced
2034                         **  with a 2-byte length followed by the value.
2035                         **  Example:
2036                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
2037                         **  Where "xx xx" = length bytes.  Shown here with
2038                         **  optional authenticator omitted.
2039                         */
2040
2041                         /*  KerberosWrapper.Ticket              */
2042                         s2n(enc_ticket->length,p);
2043                         memcpy(p, enc_ticket->data, enc_ticket->length);
2044                         p+= enc_ticket->length;
2045                         n = enc_ticket->length + 2;
2046
2047                         /*  KerberosWrapper.Authenticator       */
2048                         if (authp  &&  authp->length)
2049                                 {
2050                                 s2n(authp->length,p);
2051                                 memcpy(p, authp->data, authp->length);
2052                                 p+= authp->length;
2053                                 n+= authp->length + 2;
2054
2055                                 free(authp->data);
2056                                 authp->data = NULL;
2057                                 authp->length = 0;
2058                                 }
2059                         else
2060                                 {
2061                                 s2n(0,p);/*  null authenticator length  */
2062                                 n+=2;
2063                                 }
2064
2065                             tmp_buf[0]=s->client_version>>8;
2066                             tmp_buf[1]=s->client_version&0xff;
2067                             if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2068                                 goto err;
2069
2070                         /*  20010420 VRS.  Tried it this way; failed.
2071                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
2072                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
2073                         **                              kssl_ctx->length);
2074                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
2075                         */
2076
2077                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
2078                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
2079                                 kssl_ctx->key,iv);
2080                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
2081                                 sizeof tmp_buf);
2082                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
2083                         outl += padl;
2084                         if (outl > sizeof epms)
2085                                 {
2086                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2087                                 goto err;
2088                                 }
2089                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2090
2091                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
2092                         s2n(outl,p);
2093                         memcpy(p, epms, outl);
2094                         p+=outl;
2095                         n+=outl + 2;
2096
2097                         s->session->master_key_length=
2098                                 s->method->ssl3_enc->generate_master_secret(s,
2099                                         s->session->master_key,
2100                                         tmp_buf, sizeof tmp_buf);
2101
2102                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
2103                         OPENSSL_cleanse(epms, outl);
2104                         }
2105 #endif
2106 #ifndef OPENSSL_NO_DH
2107                 else if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2108                         {
2109                         DH *dh_srvr,*dh_clnt;
2110
2111                         if (s->session->sess_cert == NULL)
2112                                 {
2113                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2114                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
2115                                 goto err;
2116                                 }
2117
2118                         if (s->session->sess_cert->peer_dh_tmp != NULL)
2119                                 dh_srvr=s->session->sess_cert->peer_dh_tmp;
2120                         else
2121                                 {
2122                                 /* we get them from the cert */
2123                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
2124                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
2125                                 goto err;
2126                                 }
2127
2128                         /* generate a new random key */
2129                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
2130                                 {
2131                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2132                                 goto err;
2133                                 }
2134                         if (!DH_generate_key(dh_clnt))
2135                                 {
2136                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2137                                 goto err;
2138                                 }
2139
2140                         /* use the 'p' output buffer for the DH key, but
2141                          * make sure to clear it out afterwards */
2142
2143                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
2144
2145                         if (n <= 0)
2146                                 {
2147                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2148                                 goto err;
2149                                 }
2150
2151                         /* generate master key from the result */
2152                         s->session->master_key_length=
2153                                 s->method->ssl3_enc->generate_master_secret(s,
2154                                         s->session->master_key,p,n);
2155                         /* clean up */
2156                         memset(p,0,n);
2157
2158                         /* send off the data */
2159                         n=BN_num_bytes(dh_clnt->pub_key);
2160                         s2n(n,p);
2161                         BN_bn2bin(dh_clnt->pub_key,p);
2162                         n+=2;
2163
2164                         DH_free(dh_clnt);
2165
2166                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
2167                         }
2168 #endif
2169
2170 #ifndef OPENSSL_NO_ECDH
2171                 else if ((l & SSL_kECDH) || (l & SSL_kECDHE))
2172                         {
2173                         const EC_GROUP *srvr_group = NULL;
2174                         EC_KEY *tkey;
2175                         int ecdh_clnt_cert = 0;
2176                         int field_size = 0;
2177
2178                         /* Did we send out the client's
2179                          * ECDH share for use in premaster
2180                          * computation as part of client certificate?
2181                          * If so, set ecdh_clnt_cert to 1.
2182                          */
2183                         if ((l & SSL_kECDH) && (s->cert != NULL))
2184                                 {
2185                                 /* XXX: For now, we do not support client
2186                                  * authentication using ECDH certificates.
2187                                  * To add such support, one needs to add
2188                                  * code that checks for appropriate
2189                                  * conditions and sets ecdh_clnt_cert to 1.
2190                                  * For example, the cert have an ECC
2191                                  * key on the same curve as the server's
2192                                  * and the key should be authorized for
2193                                  * key agreement.
2194                                  *
2195                                  * One also needs to add code in ssl3_connect
2196                                  * to skip sending the certificate verify
2197                                  * message.
2198                                  *
2199                                  * if ((s->cert->key->privatekey != NULL) &&
2200                                  *     (s->cert->key->privatekey->type ==
2201                                  *      EVP_PKEY_EC) && ...)
2202                                  * ecdh_clnt_cert = 1;
2203                                  */
2204                                 }
2205
2206                         if (s->session->sess_cert->peer_ecdh_tmp != NULL)
2207                                 {
2208                                 tkey = s->session->sess_cert->peer_ecdh_tmp;
2209                                 }
2210                         else
2211                                 {
2212                                 /* Get the Server Public Key from Cert */
2213                                 srvr_pub_pkey = X509_get_pubkey(s->session-> \
2214                                     sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
2215                                 if ((srvr_pub_pkey == NULL) ||
2216                                     (srvr_pub_pkey->type != EVP_PKEY_EC) ||
2217                                     (srvr_pub_pkey->pkey.ec == NULL))
2218                                         {
2219                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2220                                             ERR_R_INTERNAL_ERROR);
2221                                         goto err;
2222                                         }
2223
2224                                 tkey = srvr_pub_pkey->pkey.ec;
2225                                 }
2226
2227                         srvr_group   = EC_KEY_get0_group(tkey);
2228                         srvr_ecpoint = EC_KEY_get0_public_key(tkey);
2229
2230                         if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
2231                                 {
2232                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2233                                     ERR_R_INTERNAL_ERROR);
2234                                 goto err;
2235                                 }
2236
2237                         if ((clnt_ecdh=EC_KEY_new()) == NULL)
2238                                 {
2239                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2240                                 goto err;
2241                                 }
2242
2243                         if (!EC_KEY_set_group(clnt_ecdh, srvr_group))
2244                                 {
2245                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2246                                 goto err;
2247                                 }
2248                         if (ecdh_clnt_cert)
2249                                 {
2250                                 /* Reuse key info from our certificate
2251                                  * We only need our private key to perform
2252                                  * the ECDH computation.
2253                                  */
2254                                 const BIGNUM *priv_key;
2255                                 tkey = s->cert->key->privatekey->pkey.ec;
2256                                 priv_key = EC_KEY_get0_private_key(tkey);
2257                                 if (priv_key == NULL)
2258                                         {
2259                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2260                                         goto err;
2261                                         }
2262                                 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key))
2263                                         {
2264                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2265                                         goto err;
2266                                         }
2267                                 }
2268                         else
2269                                 {
2270                                 /* Generate a new ECDH key pair */
2271                                 if (!(EC_KEY_generate_key(clnt_ecdh)))
2272                                         {
2273                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2274                                         goto err;
2275                                         }
2276                                 }
2277
2278                         /* use the 'p' output buffer for the ECDH key, but
2279                          * make sure to clear it out afterwards
2280                          */
2281
2282                         field_size = EC_GROUP_get_degree(srvr_group);
2283                         if (field_size <= 0)
2284                                 {
2285                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2286                                        ERR_R_ECDH_LIB);
2287                                 goto err;
2288                                 }
2289                         n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
2290                         if (n <= 0)
2291                                 {
2292                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2293                                        ERR_R_ECDH_LIB);
2294                                 goto err;
2295                                 }
2296
2297                         /* generate master key from the result */
2298                         s->session->master_key_length = s->method->ssl3_enc \
2299                             -> generate_master_secret(s,
2300                                 s->session->master_key,
2301                                 p, n);
2302
2303                         memset(p, 0, n); /* clean up */
2304
2305                         if (ecdh_clnt_cert)
2306                                 {
2307                                 /* Send empty client key exch message */
2308                                 n = 0;
2309                                 }
2310                         else
2311                                 {
2312                                 /* First check the size of encoding and
2313                                  * allocate memory accordingly.
2314                                  */
2315                                 encoded_pt_len =
2316                                     EC_POINT_point2oct(srvr_group,
2317                                         EC_KEY_get0_public_key(clnt_ecdh),
2318                                         POINT_CONVERSION_UNCOMPRESSED,
2319                                         NULL, 0, NULL);
2320
2321                                 encodedPoint = (unsigned char *)
2322                                     OPENSSL_malloc(encoded_pt_len *
2323                                         sizeof(unsigned char));
2324                                 bn_ctx = BN_CTX_new();
2325                                 if ((encodedPoint == NULL) ||
2326                                     (bn_ctx == NULL))
2327                                         {
2328                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2329                                         goto err;
2330                                         }
2331
2332                                 /* Encode the public key */
2333                                 n = EC_POINT_point2oct(srvr_group,
2334                                     EC_KEY_get0_public_key(clnt_ecdh),
2335                                     POINT_CONVERSION_UNCOMPRESSED,
2336                                     encodedPoint, encoded_pt_len, bn_ctx);
2337
2338                                 *p = n; /* length of encoded point */
2339                                 /* Encoded point will be copied here */
2340                                 p += 1;
2341                                 /* copy the point */
2342                                 memcpy((unsigned char *)p, encodedPoint, n);
2343                                 /* increment n to account for length field */
2344                                 n += 1;
2345                                 }
2346
2347                         /* Free allocated memory */
2348                         BN_CTX_free(bn_ctx);
2349                         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2350                         if (clnt_ecdh != NULL)
2351                                  EC_KEY_free(clnt_ecdh);
2352                         EVP_PKEY_free(srvr_pub_pkey);
2353                         }
2354 #endif /* !OPENSSL_NO_ECDH */
2355                 else
2356                         {
2357                         ssl3_send_alert(s, SSL3_AL_FATAL,
2358                             SSL_AD_HANDSHAKE_FAILURE);
2359                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2360                             ERR_R_INTERNAL_ERROR);
2361                         goto err;
2362                         }
2363
2364                 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
2365                 l2n3(n,d);
2366
2367                 s->state=SSL3_ST_CW_KEY_EXCH_B;
2368                 /* number of bytes to write */
2369                 s->init_num=n+4;
2370                 s->init_off=0;
2371                 }
2372
2373         /* SSL3_ST_CW_KEY_EXCH_B */
2374         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2375 err:
2376 #ifndef OPENSSL_NO_ECDH
2377         BN_CTX_free(bn_ctx);
2378         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2379         if (clnt_ecdh != NULL)
2380                 EC_KEY_free(clnt_ecdh);
2381         EVP_PKEY_free(srvr_pub_pkey);
2382 #endif
2383         return(-1);
2384         }
2385
2386 int ssl3_send_client_verify(SSL *s)
2387         {
2388         unsigned char *p,*d;
2389         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
2390         EVP_PKEY *pkey;
2391 #ifndef OPENSSL_NO_RSA
2392         unsigned u=0;
2393 #endif
2394         unsigned long n;
2395 #if !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_ECDSA)
2396         int j;
2397 #endif
2398
2399         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
2400                 {
2401                 d=(unsigned char *)s->init_buf->data;
2402                 p= &(d[4]);
2403                 pkey=s->cert->key->privatekey;
2404
2405                 s->method->ssl3_enc->cert_verify_mac(s,&(s->s3->finish_dgst2),
2406                         &(data[MD5_DIGEST_LENGTH]));
2407
2408 #ifndef OPENSSL_NO_RSA
2409                 if (pkey->type == EVP_PKEY_RSA)
2410                         {
2411                         s->method->ssl3_enc->cert_verify_mac(s,
2412                                 &(s->s3->finish_dgst1),&(data[0]));
2413                         if (RSA_sign(NID_md5_sha1, data,
2414                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
2415                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
2416                                 {
2417                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
2418                                 goto err;
2419                                 }
2420                         s2n(u,p);
2421                         n=u+2;
2422                         }
2423                 else
2424 #endif
2425 #ifndef OPENSSL_NO_DSA
2426                         if (pkey->type == EVP_PKEY_DSA)
2427                         {
2428                         if (!DSA_sign(pkey->save_type,
2429                                 &(data[MD5_DIGEST_LENGTH]),
2430                                 SHA_DIGEST_LENGTH,&(p[2]),
2431                                 (unsigned int *)&j,pkey->pkey.dsa))
2432                                 {
2433                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
2434                                 goto err;
2435                                 }
2436                         s2n(j,p);
2437                         n=j+2;
2438                         }
2439                 else
2440 #endif
2441 #ifndef OPENSSL_NO_ECDSA
2442                         if (pkey->type == EVP_PKEY_EC)
2443                         {
2444                         if (!ECDSA_sign(pkey->save_type,
2445                                 &(data[MD5_DIGEST_LENGTH]),
2446                                 SHA_DIGEST_LENGTH,&(p[2]),
2447                                 (unsigned int *)&j,pkey->pkey.ec))
2448                                 {
2449                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
2450                                     ERR_R_ECDSA_LIB);
2451                                 goto err;
2452                                 }
2453                         s2n(j,p);
2454                         n=j+2;
2455                         }
2456                 else
2457 #endif
2458                         {
2459                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
2460                         goto err;
2461                         }
2462                 *(d++)=SSL3_MT_CERTIFICATE_VERIFY;
2463                 l2n3(n,d);
2464
2465                 s->state=SSL3_ST_CW_CERT_VRFY_B;
2466                 s->init_num=(int)n+4;
2467                 s->init_off=0;
2468                 }
2469         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2470 err:
2471         return(-1);
2472         }
2473
2474 int ssl3_send_client_certificate(SSL *s)
2475         {
2476         X509 *x509=NULL;
2477         EVP_PKEY *pkey=NULL;
2478         int i;
2479         unsigned long l;
2480
2481         if (s->state == SSL3_ST_CW_CERT_A)
2482                 {
2483                 if ((s->cert == NULL) ||
2484                         (s->cert->key->x509 == NULL) ||
2485                         (s->cert->key->privatekey == NULL))
2486                         s->state=SSL3_ST_CW_CERT_B;
2487                 else
2488                         s->state=SSL3_ST_CW_CERT_C;
2489                 }
2490
2491         /* We need to get a client cert */
2492         if (s->state == SSL3_ST_CW_CERT_B)
2493                 {
2494                 /* If we get an error, we need to
2495                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
2496                  * We then get retied later */
2497                 i=0;
2498                 i = ssl_do_client_cert_cb(s, &x509, &pkey);
2499                 if (i < 0)
2500                         {
2501                         s->rwstate=SSL_X509_LOOKUP;
2502                         return(-1);
2503                         }
2504                 s->rwstate=SSL_NOTHING;
2505                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
2506                         {
2507                         s->state=SSL3_ST_CW_CERT_B;
2508                         if (    !SSL_use_certificate(s,x509) ||
2509                                 !SSL_use_PrivateKey(s,pkey))
2510                                 i=0;
2511                         }
2512                 else if (i == 1)
2513                         {
2514                         i=0;
2515                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
2516                         }
2517
2518                 if (x509 != NULL) X509_free(x509);
2519                 if (pkey != NULL) EVP_PKEY_free(pkey);
2520                 if (i == 0)
2521                         {
2522                         if (s->version == SSL3_VERSION)
2523                                 {
2524                                 s->s3->tmp.cert_req=0;
2525                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
2526                                 return(1);
2527                                 }
2528                         else
2529                                 {
2530                                 s->s3->tmp.cert_req=2;
2531                                 }
2532                         }
2533
2534                 /* Ok, we have a cert */
2535                 s->state=SSL3_ST_CW_CERT_C;
2536                 }
2537
2538         if (s->state == SSL3_ST_CW_CERT_C)
2539                 {
2540                 s->state=SSL3_ST_CW_CERT_D;
2541                 l=ssl3_output_cert_chain(s,
2542                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
2543                 s->init_num=(int)l;
2544                 s->init_off=0;
2545                 }
2546         /* SSL3_ST_CW_CERT_D */
2547         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2548         }
2549
2550 #define has_bits(i,m)   (((i)&(m)) == (m))
2551
2552 int ssl3_check_cert_and_algorithm(SSL *s)
2553         {
2554         int i,idx;
2555         long algs;
2556         EVP_PKEY *pkey=NULL;
2557         SESS_CERT *sc;
2558 #ifndef OPENSSL_NO_RSA
2559         RSA *rsa;
2560 #endif
2561 #ifndef OPENSSL_NO_DH
2562         DH *dh;
2563 #endif
2564
2565         sc=s->session->sess_cert;
2566
2567         algs=s->s3->tmp.new_cipher->algorithms;
2568
2569         /* we don't have a certificate */
2570         if (algs & (SSL_aDH|SSL_aNULL|SSL_aKRB5))
2571                 return(1);
2572
2573         if (sc == NULL)
2574                 {
2575                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,ERR_R_INTERNAL_ERROR);
2576                 goto err;
2577                 }
2578
2579 #ifndef OPENSSL_NO_RSA
2580         rsa=s->session->sess_cert->peer_rsa_tmp;
2581 #endif
2582 #ifndef OPENSSL_NO_DH
2583         dh=s->session->sess_cert->peer_dh_tmp;
2584 #endif
2585
2586         /* This is the passed certificate */
2587
2588         idx=sc->peer_cert_type;
2589 #ifndef OPENSSL_NO_ECDH
2590         if (idx == SSL_PKEY_ECC)
2591                 {
2592                 if (check_srvr_ecc_cert_and_alg(sc->peer_pkeys[idx].x509,
2593                     s->s3->tmp.new_cipher) == 0)
2594                         { /* check failed */
2595                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_BAD_ECC_CERT);
2596                         goto f_err;
2597                         }
2598                 else
2599                         {
2600                         return 1;
2601                         }
2602                 }
2603 #endif
2604         pkey=X509_get_pubkey(sc->peer_pkeys[idx].x509);
2605         i=X509_certificate_type(sc->peer_pkeys[idx].x509,pkey);
2606         EVP_PKEY_free(pkey);
2607
2608
2609         /* Check that we have a certificate if we require one */
2610         if ((algs & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
2611                 {
2612                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
2613                 goto f_err;
2614                 }
2615 #ifndef OPENSSL_NO_DSA
2616         else if ((algs & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
2617                 {
2618                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
2619                 goto f_err;
2620                 }
2621 #endif
2622 #ifndef OPENSSL_NO_RSA
2623         if ((algs & SSL_kRSA) &&
2624                 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
2625                 {
2626                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
2627                 goto f_err;
2628                 }
2629 #endif
2630 #ifndef OPENSSL_NO_DH
2631         if ((algs & SSL_kEDH) &&
2632                 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
2633                 {
2634                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
2635                 goto f_err;
2636                 }
2637         else if ((algs & SSL_kDHr) && !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
2638                 {
2639                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
2640                 goto f_err;
2641                 }
2642 #ifndef OPENSSL_NO_DSA
2643         else if ((algs & SSL_kDHd) && !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
2644                 {
2645                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
2646                 goto f_err;
2647                 }
2648 #endif
2649 #endif
2650
2651         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i,EVP_PKT_EXP))
2652                 {
2653 #ifndef OPENSSL_NO_RSA
2654                 if (algs & SSL_kRSA)
2655                         {
2656                         if (rsa == NULL
2657                             || RSA_size(rsa)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
2658                                 {
2659                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
2660                                 goto f_err;
2661                                 }
2662                         }
2663                 else
2664 #endif
2665 #ifndef OPENSSL_NO_DH
2666                         if (algs & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2667                             {
2668                             if (dh == NULL
2669                                 || DH_size(dh)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
2670                                 {
2671                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
2672                                 goto f_err;
2673                                 }
2674                         }
2675                 else
2676 #endif
2677                         {
2678                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
2679                         goto f_err;
2680                         }
2681                 }
2682         return(1);
2683 f_err:
2684         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
2685 err:
2686         return(0);
2687         }
2688
2689
2690 #ifndef OPENSSL_NO_ECDH
2691 /* This is the complement of nid2curve_id in s3_srvr.c. */
2692 static int curve_id2nid(int curve_id)
2693 {
2694         /* ECC curves from draft-ietf-tls-ecc-01.txt (Mar 15, 2001)
2695          * (no changes in draft-ietf-tls-ecc-03.txt [June 2003]) */
2696         static int nid_list[26] =
2697         {
2698                 0,
2699                 NID_sect163k1, /* sect163k1 (1) */
2700                 NID_sect163r1, /* sect163r1 (2) */
2701                 NID_sect163r2, /* sect163r2 (3) */
2702                 NID_sect193r1, /* sect193r1 (4) */
2703                 NID_sect193r2, /* sect193r2 (5) */
2704                 NID_sect233k1, /* sect233k1 (6) */
2705                 NID_sect233r1, /* sect233r1 (7) */
2706                 NID_sect239k1, /* sect239k1 (8) */
2707                 NID_sect283k1, /* sect283k1 (9) */
2708                 NID_sect283r1, /* sect283r1 (10) */
2709                 NID_sect409k1, /* sect409k1 (11) */
2710                 NID_sect409r1, /* sect409r1 (12) */
2711                 NID_sect571k1, /* sect571k1 (13) */
2712                 NID_sect571r1, /* sect571r1 (14) */
2713                 NID_secp160k1, /* secp160k1 (15) */
2714                 NID_secp160r1, /* secp160r1 (16) */
2715                 NID_secp160r2, /* secp160r2 (17) */
2716                 NID_secp192k1, /* secp192k1 (18) */
2717                 NID_X9_62_prime192v1, /* secp192r1 (19) */
2718                 NID_secp224k1, /* secp224k1 (20) */
2719                 NID_secp224r1, /* secp224r1 (21) */
2720                 NID_secp256k1, /* secp256k1 (22) */
2721                 NID_X9_62_prime256v1, /* secp256r1 (23) */
2722                 NID_secp384r1, /* secp384r1 (24) */
2723                 NID_secp521r1  /* secp521r1 (25) */
2724         };
2725
2726         if ((curve_id < 1) || (curve_id > 25)) return 0;
2727
2728         return nid_list[curve_id];
2729 }
2730 #endif
2731
2732 /* Check to see if handshake is full or resumed. Usually this is just a
2733  * case of checking to see if a cache hit has occurred. In the case of
2734  * session tickets we have to check the next message to be sure.
2735  */
2736
2737 #ifndef OPENSSL_NO_TLSEXT
2738 static int ssl3_check_finished(SSL *s)
2739         {
2740         int ok;
2741         long n;
2742         /* If we have no ticket or session ID is non-zero length (a match of
2743          * a non-zero session length would never reach here) it cannot be a
2744          * resumed session.
2745          */
2746         if (!s->session->tlsext_tick || s->session->session_id_length)
2747                 return 1;
2748         /* this function is called when we really expect a Certificate
2749          * message, so permit appropriate message length */
2750         n=s->method->ssl_get_message(s,
2751                 SSL3_ST_CR_CERT_A,
2752                 SSL3_ST_CR_CERT_B,
2753                 -1,
2754                 s->max_cert_list,
2755                 &ok);
2756         if (!ok) return((int)n);
2757         s->s3->tmp.reuse_message = 1;
2758         if ((s->s3->tmp.message_type == SSL3_MT_FINISHED)
2759                 || (s->s3->tmp.message_type == SSL3_MT_NEWSESSION_TICKET))
2760                 return 2;
2761
2762         return 1;
2763         }
2764 #endif
2765
2766 int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey)
2767         {
2768         int i = 0;
2769 #ifndef OPENSSL_NO_ENGINE
2770         if (s->ctx->client_cert_engine)
2771                 {
2772                 i = ENGINE_load_ssl_client_cert(s->ctx->client_cert_engine, s,
2773                                                 SSL_get_client_CA_list(s),
2774                                                 px509, ppkey, NULL, NULL, NULL);
2775                 if (i != 0)
2776                         return i;
2777                 }
2778 #endif
2779         if (s->ctx->client_cert_cb)
2780                 i = s->ctx->client_cert_cb(s,px509,ppkey);
2781         return i;
2782         }