crypto/openssl/ssl/s3_clnt.c

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