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) 1998-2007 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  * Copyright 2005 Nokia. All rights reserved.
 126  *
 127  * The portions of the attached software ("Contribution") is developed by
 128  * Nokia Corporation and is licensed pursuant to the OpenSSL open source
 129  * license.
 130  *
 131  * The Contribution, originally written by Mika Kousa and Pasi Eronen of
 132  * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
 133  * support (see RFC 4279) to OpenSSL.
 134  *
 135  * No patent licenses or other rights except those expressly stated in
 136  * the OpenSSL open source license shall be deemed granted or received
 137  * expressly, by implication, estoppel, or otherwise.
 138  *
 139  * No assurances are provided by Nokia that the Contribution does not
 140  * infringe the patent or other intellectual property rights of any third
 141  * party or that the license provides you with all the necessary rights
 142  * to make use of the Contribution.
 143  *
 144  * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
 145  * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
 146  * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
 147  * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
 148  * OTHERWISE.
 149  */
 150
 151 #include <stdio.h>
 152 #include "ssl_locl.h"
 153 #include "kssl_lcl.h"
 154 #include <openssl/buffer.h>
 155 #include <openssl/rand.h>
 156 #include <openssl/objects.h>
 157 #include <openssl/evp.h>
 158 #include <openssl/md5.h>
 159 #ifndef OPENSSL_NO_DH
 160 #include <openssl/dh.h>
 161 #endif
 162 #include <openssl/bn.h>
 163
 164 static const SSL_METHOD *ssl3_get_client_method(int ver);
 165 static int ca_dn_cmp(const X509_NAME * const *a,const X509_NAME * const *b);
 166
 167 static const SSL_METHOD *ssl3_get_client_method(int ver)
 168         {
 169         if (ver == SSL3_VERSION)
 170                 return(SSLv3_client_method());
 171         else
 172                 return(NULL);
 173         }
 174
 175 IMPLEMENT_ssl3_meth_func(SSLv3_client_method,
 176                         ssl_undefined_function,
 177                         ssl3_connect,
 178                         ssl3_get_client_method)
 179
 180 int ssl3_connect(SSL *s)
 181         {
 182         BUF_MEM *buf=NULL;
 183         unsigned long Time=(unsigned long)time(NULL);
 184         long num1;
 185         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 186         int ret= -1;
 187         int new_state,state,skip=0;;
 188
 189         RAND_add(&Time,sizeof(Time),0);
 190         ERR_clear_error();
 191         clear_sys_error();
 192
 193         if (s->info_callback != NULL)
 194                 cb=s->info_callback;
 195         else if (s->ctx->info_callback != NULL)
 196                 cb=s->ctx->info_callback;
 197
 198         s->in_handshake++;
 199         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 200
 201         for (;;)
 202                 {
 203                 state=s->state;
 204
 205                 switch(s->state)
 206                         {
 207                 case SSL_ST_RENEGOTIATE:
 208                         s->new_session=1;
 209                         s->state=SSL_ST_CONNECT;
 210                         s->ctx->stats.sess_connect_renegotiate++;
 211                         /* break */
 212                 case SSL_ST_BEFORE:
 213                 case SSL_ST_CONNECT:
 214                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 215                 case SSL_ST_OK|SSL_ST_CONNECT:
 216
 217                         s->server=0;
 218                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 219
 220                         if ((s->version & 0xff00 ) != 0x0300)
 221                                 {
 222                                 SSLerr(SSL_F_SSL3_CONNECT, ERR_R_INTERNAL_ERROR);
 223                                 ret = -1;
 224                                 goto end;
 225                                 }
 226
 227                         /* s->version=SSL3_VERSION; */
 228                         s->type=SSL_ST_CONNECT;
 229
 230                         if (s->init_buf == NULL)
 231                                 {
 232                                 if ((buf=BUF_MEM_new()) == NULL)
 233                                         {
 234                                         ret= -1;
 235                                         goto end;
 236                                         }
 237                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 238                                         {
 239                                         ret= -1;
 240                                         goto end;
 241                                         }
 242                                 s->init_buf=buf;
 243                                 buf=NULL;
 244                                 }
 245
 246                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
 247
 248                         /* setup buffing BIO */
 249                         if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
 250
 251                         /* don't push the buffering BIO quite yet */
 252
 253                         ssl3_init_finished_mac(s);
 254
 255                         s->state=SSL3_ST_CW_CLNT_HELLO_A;
 256                         s->ctx->stats.sess_connect++;
 257                         s->init_num=0;
 258                         break;
 259
 260                 case SSL3_ST_CW_CLNT_HELLO_A:
 261                 case SSL3_ST_CW_CLNT_HELLO_B:
 262
 263                         s->shutdown=0;
 264                         ret=ssl3_client_hello(s);
 265                         if (ret <= 0) goto end;
 266                         s->state=SSL3_ST_CR_SRVR_HELLO_A;
 267                         s->init_num=0;
 268
 269                         /* turn on buffering for the next lot of output */
 270                         if (s->bbio != s->wbio)
 271                                 s->wbio=BIO_push(s->bbio,s->wbio);
 272
 273                         break;
 274
 275                 case SSL3_ST_CR_SRVR_HELLO_A:
 276                 case SSL3_ST_CR_SRVR_HELLO_B:
 277                         ret=ssl3_get_server_hello(s);
 278                         if (ret <= 0) goto end;
 279
 280                         if (s->hit)
 281                                 s->state=SSL3_ST_CR_FINISHED_A;
 282                         else
 283                                 s->state=SSL3_ST_CR_CERT_A;
 284                         s->init_num=0;
 285                         break;
 286
 287                 case SSL3_ST_CR_CERT_A:
 288                 case SSL3_ST_CR_CERT_B:
 289                         /* Check if it is anon DH/ECDH */
 290                         /* or PSK */
 291                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
 292                             !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 293                                 {
 294                                 ret=ssl3_get_server_certificate(s);
 295                                 if (ret <= 0) goto end;
 296                                 }
 297                         else
 298                                 skip=1;
 299                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 300                         s->init_num=0;
 301                         break;
 302
 303                 case SSL3_ST_CR_KEY_EXCH_A:
 304                 case SSL3_ST_CR_KEY_EXCH_B:
 305                         ret=ssl3_get_key_exchange(s);
 306                         if (ret <= 0) goto end;
 307                         s->state=SSL3_ST_CR_CERT_REQ_A;
 308                         s->init_num=0;
 309
 310                         /* at this point we check that we have the
 311                          * required stuff from the server */
 312                         if (!ssl3_check_cert_and_algorithm(s))
 313                                 {
 314                                 ret= -1;
 315                                 goto end;
 316                                 }
 317                         break;
 318
 319                 case SSL3_ST_CR_CERT_REQ_A:
 320                 case SSL3_ST_CR_CERT_REQ_B:
 321                         ret=ssl3_get_certificate_request(s);
 322                         if (ret <= 0) goto end;
 323                         s->state=SSL3_ST_CR_SRVR_DONE_A;
 324                         s->init_num=0;
 325                         break;
 326
 327                 case SSL3_ST_CR_SRVR_DONE_A:
 328                 case SSL3_ST_CR_SRVR_DONE_B:
 329                         ret=ssl3_get_server_done(s);
 330                         if (ret <= 0) goto end;
 331                         if (s->s3->tmp.cert_req)
 332                                 s->state=SSL3_ST_CW_CERT_A;
 333                         else
 334                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
 335                         s->init_num=0;
 336
 337                         break;
 338
 339                 case SSL3_ST_CW_CERT_A:
 340                 case SSL3_ST_CW_CERT_B:
 341                 case SSL3_ST_CW_CERT_C:
 342                 case SSL3_ST_CW_CERT_D:
 343                         ret=ssl3_send_client_certificate(s);
 344                         if (ret <= 0) goto end;
 345                         s->state=SSL3_ST_CW_KEY_EXCH_A;
 346                         s->init_num=0;
 347                         break;
 348
 349                 case SSL3_ST_CW_KEY_EXCH_A:
 350                 case SSL3_ST_CW_KEY_EXCH_B:
 351                         ret=ssl3_send_client_key_exchange(s);
 352                         if (ret <= 0) goto end;
 353                         /* EAY EAY EAY need to check for DH fix cert
 354                          * sent back */
 355                         /* For TLS, cert_req is set to 2, so a cert chain
 356                          * of nothing is sent, but no verify packet is sent */
 357                         /* XXX: For now, we do not support client
 358                          * authentication in ECDH cipher suites with
 359                          * ECDH (rather than ECDSA) certificates.
 360                          * We need to skip the certificate verify
 361                          * message when client's ECDH public key is sent
 362                          * inside the client certificate.
 363                          */
 364                         if (s->s3->tmp.cert_req == 1)
 365                                 {
 366                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
 367                                 }
 368                         else
 369                                 {
 370                                 s->state=SSL3_ST_CW_CHANGE_A;
 371                                 s->s3->change_cipher_spec=0;
 372                                 }
 373
 374                         s->init_num=0;
 375                         break;
 376
 377                 case SSL3_ST_CW_CERT_VRFY_A:
 378                 case SSL3_ST_CW_CERT_VRFY_B:
 379                         ret=ssl3_send_client_verify(s);
 380                         if (ret <= 0) goto end;
 381                         s->state=SSL3_ST_CW_CHANGE_A;
 382                         s->init_num=0;
 383                         s->s3->change_cipher_spec=0;
 384                         break;
 385
 386                 case SSL3_ST_CW_CHANGE_A:
 387                 case SSL3_ST_CW_CHANGE_B:
 388                         ret=ssl3_send_change_cipher_spec(s,
 389                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
 390                         if (ret <= 0) goto end;
 391                         s->state=SSL3_ST_CW_FINISHED_A;
 392                         s->init_num=0;
 393
 394                         s->session->cipher=s->s3->tmp.new_cipher;
 395 #ifdef OPENSSL_NO_COMP
 396                         s->session->compress_meth=0;
 397 #else
 398                         if (s->s3->tmp.new_compression == NULL)
 399                                 s->session->compress_meth=0;
 400                         else
 401                                 s->session->compress_meth=
 402                                         s->s3->tmp.new_compression->id;
 403 #endif
 404                         if (!s->method->ssl3_enc->setup_key_block(s))
 405                                 {
 406                                 ret= -1;
 407                                 goto end;
 408                                 }
 409
 410                         if (!s->method->ssl3_enc->change_cipher_state(s,
 411                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 412                                 {
 413                                 ret= -1;
 414                                 goto end;
 415                                 }
 416
 417                         break;
 418
 419                 case SSL3_ST_CW_FINISHED_A:
 420                 case SSL3_ST_CW_FINISHED_B:
 421                         ret=ssl3_send_finished(s,
 422                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
 423                                 s->method->ssl3_enc->client_finished_label,
 424                                 s->method->ssl3_enc->client_finished_label_len);
 425                         if (ret <= 0) goto end;
 426                         s->state=SSL3_ST_CW_FLUSH;
 427
 428                         /* clear flags */
 429                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
 430                         if (s->hit)
 431                                 {
 432                                 s->s3->tmp.next_state=SSL_ST_OK;
 433                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
 434                                         {
 435                                         s->state=SSL_ST_OK;
 436                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
 437                                         s->s3->delay_buf_pop_ret=0;
 438                                         }
 439                                 }
 440                         else
 441                                 {
 442                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
 443                                 }
 444                         s->init_num=0;
 445                         break;
 446
 447                 case SSL3_ST_CR_FINISHED_A:
 448                 case SSL3_ST_CR_FINISHED_B:
 449
 450                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
 451                                 SSL3_ST_CR_FINISHED_B);
 452                         if (ret <= 0) goto end;
 453
 454                         if (s->hit)
 455                                 s->state=SSL3_ST_CW_CHANGE_A;
 456                         else
 457                                 s->state=SSL_ST_OK;
 458                         s->init_num=0;
 459                         break;
 460
 461                 case SSL3_ST_CW_FLUSH:
 462                         /* number of bytes to be flushed */
 463                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 464                         if (num1 > 0)
 465                                 {
 466                                 s->rwstate=SSL_WRITING;
 467                                 num1=BIO_flush(s->wbio);
 468                                 if (num1 <= 0) { ret= -1; goto end; }
 469                                 s->rwstate=SSL_NOTHING;
 470                                 }
 471
 472                         s->state=s->s3->tmp.next_state;
 473                         break;
 474
 475                 case SSL_ST_OK:
 476                         /* clean a few things up */
 477                         ssl3_cleanup_key_block(s);
 478
 479                         if (s->init_buf != NULL)
 480                                 {
 481                                 BUF_MEM_free(s->init_buf);
 482                                 s->init_buf=NULL;
 483                                 }
 484
 485                         /* If we are not 'joining' the last two packets,
 486                          * remove the buffering now */
 487                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 488                                 ssl_free_wbio_buffer(s);
 489                         /* else do it later in ssl3_write */
 490
 491                         s->init_num=0;
 492                         s->new_session=0;
 493
 494                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 495                         if (s->hit) s->ctx->stats.sess_hit++;
 496
 497                         ret=1;
 498                         /* s->server=0; */
 499                         s->handshake_func=ssl3_connect;
 500                         s->ctx->stats.sess_connect_good++;
 501
 502                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 503
 504                         goto end;
 505                         /* break; */
 506
 507                 default:
 508                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_UNKNOWN_STATE);
 509                         ret= -1;
 510                         goto end;
 511                         /* break; */
 512                         }
 513
 514                 /* did we do anything */
 515                 if (!s->s3->tmp.reuse_message && !skip)
 516                         {
 517                         if (s->debug)
 518                                 {
 519                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 520                                         goto end;
 521                                 }
 522
 523                         if ((cb != NULL) && (s->state != state))
 524                                 {
 525                                 new_state=s->state;
 526                                 s->state=state;
 527                                 cb(s,SSL_CB_CONNECT_LOOP,1);
 528                                 s->state=new_state;
 529                                 }
 530                         }
 531                 skip=0;
 532                 }
 533 end:
 534         s->in_handshake--;
 535         if (buf != NULL)
 536                 BUF_MEM_free(buf);
 537         if (cb != NULL)
 538                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 539         return(ret);
 540         }
 541
 542
 543 int ssl3_client_hello(SSL *s)
 544         {
 545         unsigned char *buf;
 546         unsigned char *p,*d;
 547         int i;
 548         unsigned long Time,l;
 549 #ifndef OPENSSL_NO_COMP
 550         int j;
 551         SSL_COMP *comp;
 552 #endif
 553
 554         buf=(unsigned char *)s->init_buf->data;
 555         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
 556                 {
 557                 if ((s->session == NULL) ||
 558                         (s->session->ssl_version != s->version) ||
 559                         (s->session->not_resumable))
 560                         {
 561                         if (!ssl_get_new_session(s,0))
 562                                 goto err;
 563                         }
 564                 /* else use the pre-loaded session */
 565
 566                 p=s->s3->client_random;
 567                 Time=(unsigned long)time(NULL);                 /* Time */
 568                 l2n(Time,p);
 569                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
 570                         goto err;
 571
 572                 /* Do the message type and length last */
 573                 d=p= &(buf[4]);
 574
 575                 *(p++)=s->version>>8;
 576                 *(p++)=s->version&0xff;
 577                 s->client_version=s->version;
 578
 579                 /* Random stuff */
 580                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 581                 p+=SSL3_RANDOM_SIZE;
 582
 583                 /* Session ID */
 584                 if (s->new_session)
 585                         i=0;
 586                 else
 587                         i=s->session->session_id_length;
 588                 *(p++)=i;
 589                 if (i != 0)
 590                         {
 591                         if (i > (int)sizeof(s->session->session_id))
 592                                 {
 593                                 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 594                                 goto err;
 595                                 }
 596                         memcpy(p,s->session->session_id,i);
 597                         p+=i;
 598                         }
 599
 600                 /* Ciphers supported */
 601                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
 602                 if (i == 0)
 603                         {
 604                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 605                         goto err;
 606                         }
 607                 s2n(i,p);
 608                 p+=i;
 609
 610                 /* COMPRESSION */
 611 #ifdef OPENSSL_NO_COMP
 612                 *(p++)=1;
 613 #else
 614
 615                 if ((s->options & SSL_OP_NO_COMPRESSION)
 616                                         || !s->ctx->comp_methods)
 617                         j=0;
 618                 else
 619                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
 620                 *(p++)=1+j;
 621                 for (i=0; i<j; i++)
 622                         {
 623                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
 624                         *(p++)=comp->id;
 625                         }
 626 #endif
 627                 *(p++)=0; /* Add the NULL method */
 628 #ifndef OPENSSL_NO_TLSEXT
 629                 if (ssl_prepare_clienthello_tlsext(s) <= 0)
 630                         {
 631                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
 632                         goto err;
 633                         }
 634                 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
 635                         {
 636                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
 637                         goto err;
 638                         }
 639 #endif
 640
 641                 l=(p-d);
 642                 d=buf;
 643                 *(d++)=SSL3_MT_CLIENT_HELLO;
 644                 l2n3(l,d);
 645
 646                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 647                 /* number of bytes to write */
 648                 s->init_num=p-buf;
 649                 s->init_off=0;
 650                 }
 651
 652         /* SSL3_ST_CW_CLNT_HELLO_B */
 653         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 654 err:
 655         return(-1);
 656         }
 657
 658 int ssl3_get_server_hello(SSL *s)
 659         {
 660         STACK_OF(SSL_CIPHER) *sk;
 661         SSL_CIPHER *c;
 662         unsigned char *p,*d;
 663         int i,al,ok;
 664         unsigned int j;
 665         long n;
 666 #ifndef OPENSSL_NO_COMP
 667         SSL_COMP *comp;
 668 #endif
 669
 670         n=s->method->ssl_get_message(s,
 671                 SSL3_ST_CR_SRVR_HELLO_A,
 672                 SSL3_ST_CR_SRVR_HELLO_B,
 673                 -1,
 674                 300, /* ?? */
 675                 &ok);
 676
 677         if (!ok) return((int)n);
 678
 679         if ( SSL_version(s) == DTLS1_VERSION)
 680                 {
 681                 if ( s->s3->tmp.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST)
 682                         {
 683                         if ( s->d1->send_cookie == 0)
 684                                 {
 685                                 s->s3->tmp.reuse_message = 1;
 686                                 return 1;
 687                                 }
 688                         else /* already sent a cookie */
 689                                 {
 690                                 al=SSL_AD_UNEXPECTED_MESSAGE;
 691                                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
 692                                 goto f_err;
 693                                 }
 694                         }
 695                 }
 696
 697         if ( s->s3->tmp.message_type != SSL3_MT_SERVER_HELLO)
 698                 {
 699                 al=SSL_AD_UNEXPECTED_MESSAGE;
 700                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
 701                 goto f_err;
 702                 }
 703
 704         d=p=(unsigned char *)s->init_msg;
 705
 706         if ((p[0] != (s->version>>8)) || (p[1] != (s->version&0xff)))
 707                 {
 708                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
 709                 s->version=(s->version&0xff00)|p[1];
 710                 al=SSL_AD_PROTOCOL_VERSION;
 711                 goto f_err;
 712                 }
 713         p+=2;
 714
 715         /* load the server hello data */
 716         /* load the server random */
 717         memcpy(s->s3->server_random,p,SSL3_RANDOM_SIZE);
 718         p+=SSL3_RANDOM_SIZE;
 719
 720         /* get the session-id */
 721         j= *(p++);
 722
 723         if ((j > sizeof s->session->session_id) || (j > SSL3_SESSION_ID_SIZE))
 724                 {
 725                 al=SSL_AD_ILLEGAL_PARAMETER;
 726                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_LONG);
 727                 goto f_err;
 728                 }
 729
 730         if (j != 0 && j == s->session->session_id_length
 731             && memcmp(p,s->session->session_id,j) == 0)
 732             {
 733             if(s->sid_ctx_length != s->session->sid_ctx_length
 734                || memcmp(s->session->sid_ctx,s->sid_ctx,s->sid_ctx_length))
 735                 {
 736                 /* actually a client application bug */
 737                 al=SSL_AD_ILLEGAL_PARAMETER;
 738                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
 739                 goto f_err;
 740                 }
 741             s->hit=1;
 742             }
 743         else    /* a miss or crap from the other end */
 744                 {
 745                 /* If we were trying for session-id reuse, make a new
 746                  * SSL_SESSION so we don't stuff up other people */
 747                 s->hit=0;
 748                 if (s->session->session_id_length > 0)
 749                         {
 750                         if (!ssl_get_new_session(s,0))
 751                                 {
 752                                 al=SSL_AD_INTERNAL_ERROR;
 753                                 goto f_err;
 754                                 }
 755                         }
 756                 s->session->session_id_length=j;
 757                 memcpy(s->session->session_id,p,j); /* j could be 0 */
 758                 }
 759         p+=j;
 760         c=ssl_get_cipher_by_char(s,p);
 761         if (c == NULL)
 762                 {
 763                 /* unknown cipher */
 764                 al=SSL_AD_ILLEGAL_PARAMETER;
 765                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNKNOWN_CIPHER_RETURNED);
 766                 goto f_err;
 767                 }
 768         p+=ssl_put_cipher_by_char(s,NULL,NULL);
 769
 770         sk=ssl_get_ciphers_by_id(s);
 771         i=sk_SSL_CIPHER_find(sk,c);
 772         if (i < 0)
 773                 {
 774                 /* we did not say we would use this cipher */
 775                 al=SSL_AD_ILLEGAL_PARAMETER;
 776                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
 777                 goto f_err;
 778                 }
 779
 780         /* Depending on the session caching (internal/external), the cipher
 781            and/or cipher_id values may not be set. Make sure that
 782            cipher_id is set and use it for comparison. */
 783         if (s->session->cipher)
 784                 s->session->cipher_id = s->session->cipher->id;
 785         if (s->hit && (s->session->cipher_id != c->id))
 786                 {
 787                 if (!(s->options &
 788                         SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
 789                         {
 790                         al=SSL_AD_ILLEGAL_PARAMETER;
 791                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
 792                         goto f_err;
 793                         }
 794                 }
 795         s->s3->tmp.new_cipher=c;
 796
 797         /* lets get the compression algorithm */
 798         /* COMPRESSION */
 799 #ifdef OPENSSL_NO_COMP
 800         if (*(p++) != 0)
 801                 {
 802                 al=SSL_AD_ILLEGAL_PARAMETER;
 803                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
 804                 goto f_err;
 805                 }
 806 #else
 807         j= *(p++);
 808         if ((j == 0) || (s->options & SSL_OP_NO_COMPRESSION))
 809                 comp=NULL;
 810         else
 811                 comp=ssl3_comp_find(s->ctx->comp_methods,j);
 812
 813         if ((j != 0) && (comp == NULL))
 814                 {
 815                 al=SSL_AD_ILLEGAL_PARAMETER;
 816                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
 817                 goto f_err;
 818                 }
 819         else
 820                 {
 821                 s->s3->tmp.new_compression=comp;
 822                 }
 823 #endif
 824 #ifndef OPENSSL_NO_TLSEXT
 825         /* TLS extensions*/
 826         if (s->version > SSL3_VERSION)
 827                 {
 828                 if (!ssl_parse_serverhello_tlsext(s,&p,d,n, &al))
 829                         {
 830                         /* 'al' set by ssl_parse_serverhello_tlsext */
 831                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_PARSE_TLSEXT);
 832                         goto f_err;
 833                         }
 834                 if (ssl_check_serverhello_tlsext(s) <= 0)
 835                         {
 836                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_SERVERHELLO_TLSEXT);
 837                                 goto err;
 838                         }
 839                 }
 840 #endif
 841
 842         if (p != (d+n))
 843                 {
 844                 /* wrong packet length */
 845                 al=SSL_AD_DECODE_ERROR;
 846                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
 847                 goto err;
 848                 }
 849
 850         return(1);
 851 f_err:
 852         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 853 err:
 854         return(-1);
 855         }
 856
 857 int ssl3_get_server_certificate(SSL *s)
 858         {
 859         int al,i,ok,ret= -1;
 860         unsigned long n,nc,llen,l;
 861         X509 *x=NULL;
 862         const unsigned char *q,*p;
 863         unsigned char *d;
 864         STACK_OF(X509) *sk=NULL;
 865         SESS_CERT *sc;
 866         EVP_PKEY *pkey=NULL;
 867         int need_cert = 1; /* VRS: 0=> will allow null cert if auth == KRB5 */
 868
 869         n=s->method->ssl_get_message(s,
 870                 SSL3_ST_CR_CERT_A,
 871                 SSL3_ST_CR_CERT_B,
 872                 -1,
 873                 s->max_cert_list,
 874                 &ok);
 875
 876         if (!ok) return((int)n);
 877
 878         if (s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE)
 879                 {
 880                 s->s3->tmp.reuse_message=1;
 881                 return(1);
 882                 }
 883
 884         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
 885                 {
 886                 al=SSL_AD_UNEXPECTED_MESSAGE;
 887                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
 888                 goto f_err;
 889                 }
 890         p=d=(unsigned char *)s->init_msg;
 891
 892         if ((sk=sk_X509_new_null()) == NULL)
 893                 {
 894                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
 895                 goto err;
 896                 }
 897
 898         n2l3(p,llen);
 899         if (llen+3 != n)
 900                 {
 901                 al=SSL_AD_DECODE_ERROR;
 902                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
 903                 goto f_err;
 904                 }
 905         for (nc=0; nc<llen; )
 906                 {
 907                 n2l3(p,l);
 908                 if ((l+nc+3) > llen)
 909                         {
 910                         al=SSL_AD_DECODE_ERROR;
 911                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
 912                         goto f_err;
 913                         }
 914
 915                 q=p;
 916                 x=d2i_X509(NULL,&q,l);
 917                 if (x == NULL)
 918                         {
 919                         al=SSL_AD_BAD_CERTIFICATE;
 920                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
 921                         goto f_err;
 922                         }
 923                 if (q != (p+l))
 924                         {
 925                         al=SSL_AD_DECODE_ERROR;
 926                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
 927                         goto f_err;
 928                         }
 929                 if (!sk_X509_push(sk,x))
 930                         {
 931                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
 932                         goto err;
 933                         }
 934                 x=NULL;
 935                 nc+=l+3;
 936                 p=q;
 937                 }
 938
 939         i=ssl_verify_cert_chain(s,sk);
 940         if ((s->verify_mode != SSL_VERIFY_NONE) && (!i)
 941 #ifndef OPENSSL_NO_KRB5
 942             && !((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
 943                  (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
 944 #endif /* OPENSSL_NO_KRB5 */
 945                 )
 946                 {
 947                 al=ssl_verify_alarm_type(s->verify_result);
 948                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
 949                 goto f_err;
 950                 }
 951         ERR_clear_error(); /* but we keep s->verify_result */
 952
 953         sc=ssl_sess_cert_new();
 954         if (sc == NULL) goto err;
 955
 956         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
 957         s->session->sess_cert=sc;
 958
 959         sc->cert_chain=sk;
 960         /* Inconsistency alert: cert_chain does include the peer's
 961          * certificate, which we don't include in s3_srvr.c */
 962         x=sk_X509_value(sk,0);
 963         sk=NULL;
 964         /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/
 965
 966         pkey=X509_get_pubkey(x);
 967
 968         /* VRS: allow null cert if auth == KRB5 */
 969         need_cert = ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
 970                     (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
 971                     ? 0 : 1;
 972
 973 #ifdef KSSL_DEBUG
 974         printf("pkey,x = %p, %p\n", pkey,x);
 975         printf("ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x,pkey));
 976         printf("cipher, alg, nc = %s, %lx, %lx, %d\n", s->s3->tmp.new_cipher->name,
 977                 s->s3->tmp.new_cipher->algorithm_mkey, s->s3->tmp.new_cipher->algorithm_auth, need_cert);
 978 #endif    /* KSSL_DEBUG */
 979
 980         if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey)))
 981                 {
 982                 x=NULL;
 983                 al=SSL3_AL_FATAL;
 984                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
 985                         SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
 986                 goto f_err;
 987                 }
 988
 989         i=ssl_cert_type(x,pkey);
 990         if (need_cert && i < 0)
 991                 {
 992                 x=NULL;
 993                 al=SSL3_AL_FATAL;
 994                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
 995                         SSL_R_UNKNOWN_CERTIFICATE_TYPE);
 996                 goto f_err;
 997                 }
 998
 999         if (need_cert)
1000                 {
1001                 sc->peer_cert_type=i;
1002                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1003                 /* Why would the following ever happen?
1004                  * We just created sc a couple of lines ago. */
1005                 if (sc->peer_pkeys[i].x509 != NULL)
1006                         X509_free(sc->peer_pkeys[i].x509);
1007                 sc->peer_pkeys[i].x509=x;
1008                 sc->peer_key= &(sc->peer_pkeys[i]);
1009
1010                 if (s->session->peer != NULL)
1011                         X509_free(s->session->peer);
1012                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1013                 s->session->peer=x;
1014                 }
1015         else
1016                 {
1017                 sc->peer_cert_type=i;
1018                 sc->peer_key= NULL;
1019
1020                 if (s->session->peer != NULL)
1021                         X509_free(s->session->peer);
1022                 s->session->peer=NULL;
1023                 }
1024         s->session->verify_result = s->verify_result;
1025
1026         x=NULL;
1027         ret=1;
1028
1029         if (0)
1030                 {
1031 f_err:
1032                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1033                 }
1034 err:
1035         EVP_PKEY_free(pkey);
1036         X509_free(x);
1037         sk_X509_pop_free(sk,X509_free);
1038         return(ret);
1039         }
1040
1041 int ssl3_get_key_exchange(SSL *s)
1042         {
1043 #ifndef OPENSSL_NO_RSA
1044         unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
1045 #endif
1046         EVP_MD_CTX md_ctx;
1047         unsigned char *param,*p;
1048         int al,i,j,param_len,ok;
1049         long n,alg_k,alg_a;
1050         EVP_PKEY *pkey=NULL;
1051 #ifndef OPENSSL_NO_RSA
1052         RSA *rsa=NULL;
1053 #endif
1054 #ifndef OPENSSL_NO_DH
1055         DH *dh=NULL;
1056 #endif
1057 #ifndef OPENSSL_NO_ECDH
1058         EC_KEY *ecdh = NULL;
1059         BN_CTX *bn_ctx = NULL;
1060         EC_POINT *srvr_ecpoint = NULL;
1061         int curve_nid = 0;
1062         int encoded_pt_len = 0;
1063 #endif
1064
1065         /* use same message size as in ssl3_get_certificate_request()
1066          * as ServerKeyExchange message may be skipped */
1067         n=s->method->ssl_get_message(s,
1068                 SSL3_ST_CR_KEY_EXCH_A,
1069                 SSL3_ST_CR_KEY_EXCH_B,
1070                 -1,
1071                 s->max_cert_list,
1072                 &ok);
1073         if (!ok) return((int)n);
1074
1075         if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
1076                 {
1077 #ifndef OPENSSL_NO_PSK
1078                 /* In plain PSK ciphersuite, ServerKeyExchange can be
1079                    omitted if no identity hint is sent. Set
1080                    session->sess_cert anyway to avoid problems
1081                    later.*/
1082                 if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)
1083                         {
1084                         s->session->sess_cert=ssl_sess_cert_new();
1085                         if (s->ctx->psk_identity_hint)
1086                                 OPENSSL_free(s->ctx->psk_identity_hint);
1087                         s->ctx->psk_identity_hint = NULL;
1088                         }
1089 #endif
1090                 s->s3->tmp.reuse_message=1;
1091                 return(1);
1092                 }
1093
1094         param=p=(unsigned char *)s->init_msg;
1095         if (s->session->sess_cert != NULL)
1096                 {
1097 #ifndef OPENSSL_NO_RSA
1098                 if (s->session->sess_cert->peer_rsa_tmp != NULL)
1099                         {
1100                         RSA_free(s->session->sess_cert->peer_rsa_tmp);
1101                         s->session->sess_cert->peer_rsa_tmp=NULL;
1102                         }
1103 #endif
1104 #ifndef OPENSSL_NO_DH
1105                 if (s->session->sess_cert->peer_dh_tmp)
1106                         {
1107                         DH_free(s->session->sess_cert->peer_dh_tmp);
1108                         s->session->sess_cert->peer_dh_tmp=NULL;
1109                         }
1110 #endif
1111 #ifndef OPENSSL_NO_ECDH
1112                 if (s->session->sess_cert->peer_ecdh_tmp)
1113                         {
1114                         EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp);
1115                         s->session->sess_cert->peer_ecdh_tmp=NULL;
1116                         }
1117 #endif
1118                 }
1119         else
1120                 {
1121                 s->session->sess_cert=ssl_sess_cert_new();
1122                 }
1123
1124         param_len=0;
1125         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
1126         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
1127         EVP_MD_CTX_init(&md_ctx);
1128
1129 #ifndef OPENSSL_NO_PSK
1130         if (alg_k & SSL_kPSK)
1131                 {
1132                 char tmp_id_hint[PSK_MAX_IDENTITY_LEN+1];
1133
1134                 al=SSL_AD_HANDSHAKE_FAILURE;
1135                 n2s(p,i);
1136                 param_len=i+2;
1137                 /* Store PSK identity hint for later use, hint is used
1138                  * in ssl3_send_client_key_exchange.  Assume that the
1139                  * maximum length of a PSK identity hint can be as
1140                  * long as the maximum length of a PSK identity. */
1141                 if (i > PSK_MAX_IDENTITY_LEN)
1142                         {
1143                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1144                                 SSL_R_DATA_LENGTH_TOO_LONG);
1145                         goto f_err;
1146                         }
1147                 if (param_len > n)
1148                         {
1149                         al=SSL_AD_DECODE_ERROR;
1150                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1151                                 SSL_R_BAD_PSK_IDENTITY_HINT_LENGTH);
1152                         goto f_err;
1153                         }
1154                 /* If received PSK identity hint contains NULL
1155                  * characters, the hint is truncated from the first
1156                  * NULL. p may not be ending with NULL, so create a
1157                  * NULL-terminated string. */
1158                 memcpy(tmp_id_hint, p, i);
1159                 memset(tmp_id_hint+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
1160                 if (s->ctx->psk_identity_hint != NULL)
1161                         OPENSSL_free(s->ctx->psk_identity_hint);
1162                 s->ctx->psk_identity_hint = BUF_strdup(tmp_id_hint);
1163                 if (s->ctx->psk_identity_hint == NULL)
1164                         {
1165                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1166                         goto f_err;
1167                         }
1168
1169                 p+=i;
1170                 n-=param_len;
1171                 }
1172         else
1173 #endif /* !OPENSSL_NO_PSK */
1174 #ifndef OPENSSL_NO_RSA
1175         if (alg_k & SSL_kRSA)
1176                 {
1177                 if ((rsa=RSA_new()) == NULL)
1178                         {
1179                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1180                         goto err;
1181                         }
1182                 n2s(p,i);
1183                 param_len=i+2;
1184                 if (param_len > n)
1185                         {
1186                         al=SSL_AD_DECODE_ERROR;
1187                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
1188                         goto f_err;
1189                         }
1190                 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
1191                         {
1192                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1193                         goto err;
1194                         }
1195                 p+=i;
1196
1197                 n2s(p,i);
1198                 param_len+=i+2;
1199                 if (param_len > n)
1200                         {
1201                         al=SSL_AD_DECODE_ERROR;
1202                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
1203                         goto f_err;
1204                         }
1205                 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
1206                         {
1207                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1208                         goto err;
1209                         }
1210                 p+=i;
1211                 n-=param_len;
1212
1213                 /* this should be because we are using an export cipher */
1214                 if (alg_a & SSL_aRSA)
1215                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1216                 else
1217                         {
1218                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1219                         goto err;
1220                         }
1221                 s->session->sess_cert->peer_rsa_tmp=rsa;
1222                 rsa=NULL;
1223                 }
1224 #else /* OPENSSL_NO_RSA */
1225         if (0)
1226                 ;
1227 #endif
1228 #ifndef OPENSSL_NO_DH
1229         else if (alg_k & SSL_kEDH)
1230                 {
1231                 if ((dh=DH_new()) == NULL)
1232                         {
1233                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
1234                         goto err;
1235                         }
1236                 n2s(p,i);
1237                 param_len=i+2;
1238                 if (param_len > n)
1239                         {
1240                         al=SSL_AD_DECODE_ERROR;
1241                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
1242                         goto f_err;
1243                         }
1244                 if (!(dh->p=BN_bin2bn(p,i,NULL)))
1245                         {
1246                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1247                         goto err;
1248                         }
1249                 p+=i;
1250
1251                 n2s(p,i);
1252                 param_len+=i+2;
1253                 if (param_len > n)
1254                         {
1255                         al=SSL_AD_DECODE_ERROR;
1256                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
1257                         goto f_err;
1258                         }
1259                 if (!(dh->g=BN_bin2bn(p,i,NULL)))
1260                         {
1261                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1262                         goto err;
1263                         }
1264                 p+=i;
1265
1266                 n2s(p,i);
1267                 param_len+=i+2;
1268                 if (param_len > n)
1269                         {
1270                         al=SSL_AD_DECODE_ERROR;
1271                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
1272                         goto f_err;
1273                         }
1274                 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
1275                         {
1276                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1277                         goto err;
1278                         }
1279                 p+=i;
1280                 n-=param_len;
1281
1282 #ifndef OPENSSL_NO_RSA
1283                 if (alg_a & SSL_aRSA)
1284                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1285 #else
1286                 if (0)
1287                         ;
1288 #endif
1289 #ifndef OPENSSL_NO_DSA
1290                 else if (alg_a & SSL_aDSS)
1291                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1292 #endif
1293                 /* else anonymous DH, so no certificate or pkey. */
1294
1295                 s->session->sess_cert->peer_dh_tmp=dh;
1296                 dh=NULL;
1297                 }
1298         else if ((alg_k & SSL_kDHr) || (alg_k & SSL_kDHd))
1299                 {
1300                 al=SSL_AD_ILLEGAL_PARAMETER;
1301                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1302                 goto f_err;
1303                 }
1304 #endif /* !OPENSSL_NO_DH */
1305
1306 #ifndef OPENSSL_NO_ECDH
1307         else if (alg_k & SSL_kEECDH)
1308                 {
1309                 EC_GROUP *ngroup;
1310                 const EC_GROUP *group;
1311
1312                 if ((ecdh=EC_KEY_new()) == NULL)
1313                         {
1314                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1315                         goto err;
1316                         }
1317
1318                 /* Extract elliptic curve parameters and the
1319                  * server's ephemeral ECDH public key.
1320                  * Keep accumulating lengths of various components in
1321                  * param_len and make sure it never exceeds n.
1322                  */
1323
1324                 /* XXX: For now we only support named (not generic) curves
1325                  * and the ECParameters in this case is just three bytes.
1326                  */
1327                 param_len=3;
1328                 if ((param_len > n) ||
1329                     (*p != NAMED_CURVE_TYPE) ||
1330                     ((curve_nid = tls1_ec_curve_id2nid(*(p + 2))) == 0))
1331                         {
1332                         al=SSL_AD_INTERNAL_ERROR;
1333                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
1334                         goto f_err;
1335                         }
1336
1337                 ngroup = EC_GROUP_new_by_curve_name(curve_nid);
1338                 if (ngroup == NULL)
1339                         {
1340                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1341                         goto err;
1342                         }
1343                 if (EC_KEY_set_group(ecdh, ngroup) == 0)
1344                         {
1345                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1346                         goto err;
1347                         }
1348                 EC_GROUP_free(ngroup);
1349
1350                 group = EC_KEY_get0_group(ecdh);
1351
1352                 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1353                     (EC_GROUP_get_degree(group) > 163))
1354                         {
1355                         al=SSL_AD_EXPORT_RESTRICTION;
1356                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1357                         goto f_err;
1358                         }
1359
1360                 p+=3;
1361
1362                 /* Next, get the encoded ECPoint */
1363                 if (((srvr_ecpoint = EC_POINT_new(group)) == NULL) ||
1364                     ((bn_ctx = BN_CTX_new()) == NULL))
1365                         {
1366                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1367                         goto err;
1368                         }
1369
1370                 encoded_pt_len = *p;  /* length of encoded point */
1371                 p+=1;
1372                 param_len += (1 + encoded_pt_len);
1373                 if ((param_len > n) ||
1374                     (EC_POINT_oct2point(group, srvr_ecpoint,
1375                         p, encoded_pt_len, bn_ctx) == 0))
1376                         {
1377                         al=SSL_AD_DECODE_ERROR;
1378                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_ECPOINT);
1379                         goto f_err;
1380                         }
1381
1382                 n-=param_len;
1383                 p+=encoded_pt_len;
1384
1385                 /* The ECC/TLS specification does not mention
1386                  * the use of DSA to sign ECParameters in the server
1387                  * key exchange message. We do support RSA and ECDSA.
1388                  */
1389                 if (0) ;
1390 #ifndef OPENSSL_NO_RSA
1391                 else if (alg_a & SSL_aRSA)
1392                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1393 #endif
1394 #ifndef OPENSSL_NO_ECDSA
1395                 else if (alg_a & SSL_aECDSA)
1396                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1397 #endif
1398                 /* else anonymous ECDH, so no certificate or pkey. */
1399                 EC_KEY_set_public_key(ecdh, srvr_ecpoint);
1400                 s->session->sess_cert->peer_ecdh_tmp=ecdh;
1401                 ecdh=NULL;
1402                 BN_CTX_free(bn_ctx);
1403                 EC_POINT_free(srvr_ecpoint);
1404                 srvr_ecpoint = NULL;
1405                 }
1406         else if (alg_k)
1407                 {
1408                 al=SSL_AD_UNEXPECTED_MESSAGE;
1409                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1410                 goto f_err;
1411                 }
1412 #endif /* !OPENSSL_NO_ECDH */
1413
1414
1415         /* p points to the next byte, there are 'n' bytes left */
1416
1417         /* if it was signed, check the signature */
1418         if (pkey != NULL)
1419                 {
1420                 n2s(p,i);
1421                 n-=2;
1422                 j=EVP_PKEY_size(pkey);
1423
1424                 if ((i != n) || (n > j) || (n <= 0))
1425                         {
1426                         /* wrong packet length */
1427                         al=SSL_AD_DECODE_ERROR;
1428                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1429                         goto f_err;
1430                         }
1431
1432 #ifndef OPENSSL_NO_RSA
1433                 if (pkey->type == EVP_PKEY_RSA)
1434                         {
1435                         int num;
1436
1437                         j=0;
1438                         q=md_buf;
1439                         for (num=2; num > 0; num--)
1440                                 {
1441                                 EVP_DigestInit_ex(&md_ctx,(num == 2)
1442                                         ?s->ctx->md5:s->ctx->sha1, NULL);
1443                                 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1444                                 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1445                                 EVP_DigestUpdate(&md_ctx,param,param_len);
1446                                 EVP_DigestFinal_ex(&md_ctx,q,(unsigned int *)&i);
1447                                 q+=i;
1448                                 j+=i;
1449                                 }
1450                         i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
1451                                                                 pkey->pkey.rsa);
1452                         if (i < 0)
1453                                 {
1454                                 al=SSL_AD_DECRYPT_ERROR;
1455                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1456                                 goto f_err;
1457                                 }
1458                         if (i == 0)
1459                                 {
1460                                 /* bad signature */
1461                                 al=SSL_AD_DECRYPT_ERROR;
1462                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1463                                 goto f_err;
1464                                 }
1465                         }
1466                 else
1467 #endif
1468 #ifndef OPENSSL_NO_DSA
1469                         if (pkey->type == EVP_PKEY_DSA)
1470                         {
1471                         /* lets do DSS */
1472                         EVP_VerifyInit_ex(&md_ctx,EVP_dss1(), NULL);
1473                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1474                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1475                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1476                         if (!EVP_VerifyFinal(&md_ctx,p,(int)n,pkey))
1477                                 {
1478                                 /* bad signature */
1479                                 al=SSL_AD_DECRYPT_ERROR;
1480                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1481                                 goto f_err;
1482                                 }
1483                         }
1484                 else
1485 #endif
1486 #ifndef OPENSSL_NO_ECDSA
1487                         if (pkey->type == EVP_PKEY_EC)
1488                         {
1489                         /* let's do ECDSA */
1490                         EVP_VerifyInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1491                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1492                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1493                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1494                         if (!EVP_VerifyFinal(&md_ctx,p,(int)n,pkey))
1495                                 {
1496                                 /* bad signature */
1497                                 al=SSL_AD_DECRYPT_ERROR;
1498                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1499                                 goto f_err;
1500                                 }
1501                         }
1502                 else
1503 #endif
1504                         {
1505                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1506                         goto err;
1507                         }
1508                 }
1509         else
1510                 {
1511                 if (!(alg_a & SSL_aNULL) && !(alg_k & SSL_kPSK))
1512                         /* aNULL or kPSK do not need public keys */
1513                         {
1514                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1515                         goto err;
1516                         }
1517                 /* still data left over */
1518                 if (n != 0)
1519                         {
1520                         al=SSL_AD_DECODE_ERROR;
1521                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
1522                         goto f_err;
1523                         }
1524                 }
1525         EVP_PKEY_free(pkey);
1526         EVP_MD_CTX_cleanup(&md_ctx);
1527         return(1);
1528 f_err:
1529         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1530 err:
1531         EVP_PKEY_free(pkey);
1532 #ifndef OPENSSL_NO_RSA
1533         if (rsa != NULL)
1534                 RSA_free(rsa);
1535 #endif
1536 #ifndef OPENSSL_NO_DH
1537         if (dh != NULL)
1538                 DH_free(dh);
1539 #endif
1540 #ifndef OPENSSL_NO_ECDH
1541         BN_CTX_free(bn_ctx);
1542         EC_POINT_free(srvr_ecpoint);
1543         if (ecdh != NULL)
1544                 EC_KEY_free(ecdh);
1545 #endif
1546         EVP_MD_CTX_cleanup(&md_ctx);
1547         return(-1);
1548         }
1549
1550 int ssl3_get_certificate_request(SSL *s)
1551         {
1552         int ok,ret=0;
1553         unsigned long n,nc,l;
1554         unsigned int llen,ctype_num,i;
1555         X509_NAME *xn=NULL;
1556         const unsigned char *p,*q;
1557         unsigned char *d;
1558         STACK_OF(X509_NAME) *ca_sk=NULL;
1559
1560         n=s->method->ssl_get_message(s,
1561                 SSL3_ST_CR_CERT_REQ_A,
1562                 SSL3_ST_CR_CERT_REQ_B,
1563                 -1,
1564                 s->max_cert_list,
1565                 &ok);
1566
1567         if (!ok) return((int)n);
1568
1569         s->s3->tmp.cert_req=0;
1570
1571         if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
1572                 {
1573                 s->s3->tmp.reuse_message=1;
1574                 return(1);
1575                 }
1576
1577         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
1578                 {
1579                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1580                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
1581                 goto err;
1582                 }
1583
1584         /* TLS does not like anon-DH with client cert */
1585         if (s->version > SSL3_VERSION)
1586                 {
1587                 if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1588                         {
1589                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1590                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
1591                         goto err;
1592                         }
1593                 }
1594
1595         p=d=(unsigned char *)s->init_msg;
1596
1597         if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
1598                 {
1599                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1600                 goto err;
1601                 }
1602
1603         /* get the certificate types */
1604         ctype_num= *(p++);
1605         if (ctype_num > SSL3_CT_NUMBER)
1606                 ctype_num=SSL3_CT_NUMBER;
1607         for (i=0; i<ctype_num; i++)
1608                 s->s3->tmp.ctype[i]= p[i];
1609         p+=ctype_num;
1610
1611         /* get the CA RDNs */
1612         n2s(p,llen);
1613 #if 0
1614 {
1615 FILE *out;
1616 out=fopen("/tmp/vsign.der","w");
1617 fwrite(p,1,llen,out);
1618 fclose(out);
1619 }
1620 #endif
1621
1622         if ((llen+ctype_num+2+1) != n)
1623                 {
1624                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1625                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
1626                 goto err;
1627                 }
1628
1629         for (nc=0; nc<llen; )
1630                 {
1631                 n2s(p,l);
1632                 if ((l+nc+2) > llen)
1633                         {
1634                         if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1635                                 goto cont; /* netscape bugs */
1636                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1637                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
1638                         goto err;
1639                         }
1640
1641                 q=p;
1642
1643                 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
1644                         {
1645                         /* If netscape tolerance is on, ignore errors */
1646                         if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
1647                                 goto cont;
1648                         else
1649                                 {
1650                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1651                                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
1652                                 goto err;
1653                                 }
1654                         }
1655
1656                 if (q != (p+l))
1657                         {
1658                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1659                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
1660                         goto err;
1661                         }
1662                 if (!sk_X509_NAME_push(ca_sk,xn))
1663                         {
1664                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1665                         goto err;
1666                         }
1667
1668                 p+=l;
1669                 nc+=l+2;
1670                 }
1671
1672         if (0)
1673                 {
1674 cont:
1675                 ERR_clear_error();
1676                 }
1677
1678         /* we should setup a certificate to return.... */
1679         s->s3->tmp.cert_req=1;
1680         s->s3->tmp.ctype_num=ctype_num;
1681         if (s->s3->tmp.ca_names != NULL)
1682                 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
1683         s->s3->tmp.ca_names=ca_sk;
1684         ca_sk=NULL;
1685
1686         ret=1;
1687 err:
1688         if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
1689         return(ret);
1690         }
1691
1692 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
1693         {
1694         return(X509_NAME_cmp(*a,*b));
1695         }
1696
1697 int ssl3_get_server_done(SSL *s)
1698         {
1699         int ok,ret=0;
1700         long n;
1701
1702         n=s->method->ssl_get_message(s,
1703                 SSL3_ST_CR_SRVR_DONE_A,
1704                 SSL3_ST_CR_SRVR_DONE_B,
1705                 SSL3_MT_SERVER_DONE,
1706                 30, /* should be very small, like 0 :-) */
1707                 &ok);
1708
1709         if (!ok) return((int)n);
1710         if (n > 0)
1711                 {
1712                 /* should contain no data */
1713                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1714                 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
1715                 return -1;
1716                 }
1717         ret=1;
1718         return(ret);
1719         }
1720
1721
1722 int ssl3_send_client_key_exchange(SSL *s)
1723         {
1724         unsigned char *p,*d;
1725         int n;
1726         unsigned long alg_k;
1727 #ifndef OPENSSL_NO_RSA
1728         unsigned char *q;
1729         EVP_PKEY *pkey=NULL;
1730 #endif
1731 #ifndef OPENSSL_NO_KRB5
1732         KSSL_ERR kssl_err;
1733 #endif /* OPENSSL_NO_KRB5 */
1734 #ifndef OPENSSL_NO_ECDH
1735         EC_KEY *clnt_ecdh = NULL;
1736         const EC_POINT *srvr_ecpoint = NULL;
1737         EVP_PKEY *srvr_pub_pkey = NULL;
1738         unsigned char *encodedPoint = NULL;
1739         int encoded_pt_len = 0;
1740         BN_CTX * bn_ctx = NULL;
1741 #endif
1742
1743         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
1744                 {
1745                 d=(unsigned char *)s->init_buf->data;
1746                 p= &(d[4]);
1747
1748                 alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
1749
1750                 /* Fool emacs indentation */
1751                 if (0) {}
1752 #ifndef OPENSSL_NO_RSA
1753                 else if (alg_k & SSL_kRSA)
1754                         {
1755                         RSA *rsa;
1756                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1757
1758                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
1759                                 rsa=s->session->sess_cert->peer_rsa_tmp;
1760                         else
1761                                 {
1762                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1763                                 if ((pkey == NULL) ||
1764                                         (pkey->type != EVP_PKEY_RSA) ||
1765                                         (pkey->pkey.rsa == NULL))
1766                                         {
1767                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1768                                         goto err;
1769                                         }
1770                                 rsa=pkey->pkey.rsa;
1771                                 EVP_PKEY_free(pkey);
1772                                 }
1773
1774                         tmp_buf[0]=s->client_version>>8;
1775                         tmp_buf[1]=s->client_version&0xff;
1776                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
1777                                         goto err;
1778
1779                         s->session->master_key_length=sizeof tmp_buf;
1780
1781                         q=p;
1782                         /* Fix buf for TLS and beyond */
1783                         if (s->version > SSL3_VERSION)
1784                                 p+=2;
1785                         n=RSA_public_encrypt(sizeof tmp_buf,
1786                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
1787 #ifdef PKCS1_CHECK
1788                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
1789                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
1790 #endif
1791                         if (n <= 0)
1792                                 {
1793                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
1794                                 goto err;
1795                                 }
1796
1797                         /* Fix buf for TLS and beyond */
1798                         if (s->version > SSL3_VERSION)
1799                                 {
1800                                 s2n(n,q);
1801                                 n+=2;
1802                                 }
1803
1804                         s->session->master_key_length=
1805                                 s->method->ssl3_enc->generate_master_secret(s,
1806                                         s->session->master_key,
1807                                         tmp_buf,sizeof tmp_buf);
1808                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
1809                         }
1810 #endif
1811 #ifndef OPENSSL_NO_KRB5
1812                 else if (alg_k & SSL_kKRB5)
1813                         {
1814                         krb5_error_code krb5rc;
1815                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
1816                         /*  krb5_data   krb5_ap_req;  */
1817                         krb5_data       *enc_ticket;
1818                         krb5_data       authenticator, *authp = NULL;
1819                         EVP_CIPHER_CTX  ciph_ctx;
1820                         EVP_CIPHER      *enc = NULL;
1821                         unsigned char   iv[EVP_MAX_IV_LENGTH];
1822                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1823                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH
1824                                                 + EVP_MAX_IV_LENGTH];
1825                         int             padl, outl = sizeof(epms);
1826
1827                         EVP_CIPHER_CTX_init(&ciph_ctx);
1828
1829 #ifdef KSSL_DEBUG
1830                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
1831                                 alg_k, SSL_kKRB5);
1832 #endif  /* KSSL_DEBUG */
1833
1834                         authp = NULL;
1835 #ifdef KRB5SENDAUTH
1836                         if (KRB5SENDAUTH)  authp = &authenticator;
1837 #endif  /* KRB5SENDAUTH */
1838
1839                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
1840                                 &kssl_err);
1841                         enc = kssl_map_enc(kssl_ctx->enctype);
1842                         if (enc == NULL)
1843                             goto err;
1844 #ifdef KSSL_DEBUG
1845                         {
1846                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
1847                         if (krb5rc && kssl_err.text)
1848                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
1849                         }
1850 #endif  /* KSSL_DEBUG */
1851
1852                         if (krb5rc)
1853                                 {
1854                                 ssl3_send_alert(s,SSL3_AL_FATAL,
1855                                                 SSL_AD_HANDSHAKE_FAILURE);
1856                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1857                                                 kssl_err.reason);
1858                                 goto err;
1859                                 }
1860
1861                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
1862                         **  in place of RFC 2712 KerberosWrapper, as in:
1863                         **
1864                         **  Send ticket (copy to *p, set n = length)
1865                         **  n = krb5_ap_req.length;
1866                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
1867                         **  if (krb5_ap_req.data)
1868                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
1869                         **
1870                         **  Now using real RFC 2712 KerberosWrapper
1871                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
1872                         **  Note: 2712 "opaque" types are here replaced
1873                         **  with a 2-byte length followed by the value.
1874                         **  Example:
1875                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
1876                         **  Where "xx xx" = length bytes.  Shown here with
1877                         **  optional authenticator omitted.
1878                         */
1879
1880                         /*  KerberosWrapper.Ticket              */
1881                         s2n(enc_ticket->length,p);
1882                         memcpy(p, enc_ticket->data, enc_ticket->length);
1883                         p+= enc_ticket->length;
1884                         n = enc_ticket->length + 2;
1885
1886                         /*  KerberosWrapper.Authenticator       */
1887                         if (authp  &&  authp->length)
1888                                 {
1889                                 s2n(authp->length,p);
1890                                 memcpy(p, authp->data, authp->length);
1891                                 p+= authp->length;
1892                                 n+= authp->length + 2;
1893
1894                                 free(authp->data);
1895                                 authp->data = NULL;
1896                                 authp->length = 0;
1897                                 }
1898                         else
1899                                 {
1900                                 s2n(0,p);/*  null authenticator length  */
1901                                 n+=2;
1902                                 }
1903
1904                             tmp_buf[0]=s->client_version>>8;
1905                             tmp_buf[1]=s->client_version&0xff;
1906                             if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
1907                                 goto err;
1908
1909                         /*  20010420 VRS.  Tried it this way; failed.
1910                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
1911                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
1912                         **                              kssl_ctx->length);
1913                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
1914                         */
1915
1916                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
1917                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
1918                                 kssl_ctx->key,iv);
1919                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
1920                                 sizeof tmp_buf);
1921                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
1922                         outl += padl;
1923                         if (outl > sizeof epms)
1924                                 {
1925                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1926                                 goto err;
1927                                 }
1928                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
1929
1930                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
1931                         s2n(outl,p);
1932                         memcpy(p, epms, outl);
1933                         p+=outl;
1934                         n+=outl + 2;
1935
1936                         s->session->master_key_length=
1937                                 s->method->ssl3_enc->generate_master_secret(s,
1938                                         s->session->master_key,
1939                                         tmp_buf, sizeof tmp_buf);
1940
1941                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
1942                         OPENSSL_cleanse(epms, outl);
1943                         }
1944 #endif
1945 #ifndef OPENSSL_NO_DH
1946                 else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1947                         {
1948                         DH *dh_srvr,*dh_clnt;
1949
1950                         if (s->session->sess_cert->peer_dh_tmp != NULL)
1951                                 dh_srvr=s->session->sess_cert->peer_dh_tmp;
1952                         else
1953                                 {
1954                                 /* we get them from the cert */
1955                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1956                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
1957                                 goto err;
1958                                 }
1959
1960                         /* generate a new random key */
1961                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
1962                                 {
1963                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1964                                 goto err;
1965                                 }
1966                         if (!DH_generate_key(dh_clnt))
1967                                 {
1968                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1969                                 goto err;
1970                                 }
1971
1972                         /* use the 'p' output buffer for the DH key, but
1973                          * make sure to clear it out afterwards */
1974
1975                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
1976
1977                         if (n <= 0)
1978                                 {
1979                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1980                                 goto err;
1981                                 }
1982
1983                         /* generate master key from the result */
1984                         s->session->master_key_length=
1985                                 s->method->ssl3_enc->generate_master_secret(s,
1986                                         s->session->master_key,p,n);
1987                         /* clean up */
1988                         memset(p,0,n);
1989
1990                         /* send off the data */
1991                         n=BN_num_bytes(dh_clnt->pub_key);
1992                         s2n(n,p);
1993                         BN_bn2bin(dh_clnt->pub_key,p);
1994                         n+=2;
1995
1996                         DH_free(dh_clnt);
1997
1998                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
1999                         }
2000 #endif
2001
2002 #ifndef OPENSSL_NO_ECDH
2003                 else if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2004                         {
2005                         const EC_GROUP *srvr_group = NULL;
2006                         EC_KEY *tkey;
2007                         int ecdh_clnt_cert = 0;
2008                         int field_size = 0;
2009
2010                         /* Did we send out the client's
2011                          * ECDH share for use in premaster
2012                          * computation as part of client certificate?
2013                          * If so, set ecdh_clnt_cert to 1.
2014                          */
2015                         if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL))
2016                                 {
2017                                 /* XXX: For now, we do not support client
2018                                  * authentication using ECDH certificates.
2019                                  * To add such support, one needs to add
2020                                  * code that checks for appropriate
2021                                  * conditions and sets ecdh_clnt_cert to 1.
2022                                  * For example, the cert have an ECC
2023                                  * key on the same curve as the server's
2024                                  * and the key should be authorized for
2025                                  * key agreement.
2026                                  *
2027                                  * One also needs to add code in ssl3_connect
2028                                  * to skip sending the certificate verify
2029                                  * message.
2030                                  *
2031                                  * if ((s->cert->key->privatekey != NULL) &&
2032                                  *     (s->cert->key->privatekey->type ==
2033                                  *      EVP_PKEY_EC) && ...)
2034                                  * ecdh_clnt_cert = 1;
2035                                  */
2036                                 }
2037
2038                         if (s->session->sess_cert->peer_ecdh_tmp != NULL)
2039                                 {
2040                                 tkey = s->session->sess_cert->peer_ecdh_tmp;
2041                                 }
2042                         else
2043                                 {
2044                                 /* Get the Server Public Key from Cert */
2045                                 srvr_pub_pkey = X509_get_pubkey(s->session-> \
2046                                     sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
2047                                 if ((srvr_pub_pkey == NULL) ||
2048                                     (srvr_pub_pkey->type != EVP_PKEY_EC) ||
2049                                     (srvr_pub_pkey->pkey.ec == NULL))
2050                                         {
2051                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2052                                             ERR_R_INTERNAL_ERROR);
2053                                         goto err;
2054                                         }
2055
2056                                 tkey = srvr_pub_pkey->pkey.ec;
2057                                 }
2058
2059                         srvr_group   = EC_KEY_get0_group(tkey);
2060                         srvr_ecpoint = EC_KEY_get0_public_key(tkey);
2061
2062                         if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
2063                                 {
2064                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2065                                     ERR_R_INTERNAL_ERROR);
2066                                 goto err;
2067                                 }
2068
2069                         if ((clnt_ecdh=EC_KEY_new()) == NULL)
2070                                 {
2071                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2072                                 goto err;
2073                                 }
2074
2075                         if (!EC_KEY_set_group(clnt_ecdh, srvr_group))
2076                                 {
2077                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2078                                 goto err;
2079                                 }
2080                         if (ecdh_clnt_cert)
2081                                 {
2082                                 /* Reuse key info from our certificate
2083                                  * We only need our private key to perform
2084                                  * the ECDH computation.
2085                                  */
2086                                 const BIGNUM *priv_key;
2087                                 tkey = s->cert->key->privatekey->pkey.ec;
2088                                 priv_key = EC_KEY_get0_private_key(tkey);
2089                                 if (priv_key == NULL)
2090                                         {
2091                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2092                                         goto err;
2093                                         }
2094                                 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key))
2095                                         {
2096                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2097                                         goto err;
2098                                         }
2099                                 }
2100                         else
2101                                 {
2102                                 /* Generate a new ECDH key pair */
2103                                 if (!(EC_KEY_generate_key(clnt_ecdh)))
2104                                         {
2105                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2106                                         goto err;
2107                                         }
2108                                 }
2109
2110                         /* use the 'p' output buffer for the ECDH key, but
2111                          * make sure to clear it out afterwards
2112                          */
2113
2114                         field_size = EC_GROUP_get_degree(srvr_group);
2115                         if (field_size <= 0)
2116                                 {
2117                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2118                                        ERR_R_ECDH_LIB);
2119                                 goto err;
2120                                 }
2121                         n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
2122                         if (n <= 0)
2123                                 {
2124                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2125                                        ERR_R_ECDH_LIB);
2126                                 goto err;
2127                                 }
2128
2129                         /* generate master key from the result */
2130                         s->session->master_key_length = s->method->ssl3_enc \
2131                             -> generate_master_secret(s,
2132                                 s->session->master_key,
2133                                 p, n);
2134
2135                         memset(p, 0, n); /* clean up */
2136
2137                         if (ecdh_clnt_cert)
2138                                 {
2139                                 /* Send empty client key exch message */
2140                                 n = 0;
2141                                 }
2142                         else
2143                                 {
2144                                 /* First check the size of encoding and
2145                                  * allocate memory accordingly.
2146                                  */
2147                                 encoded_pt_len =
2148                                     EC_POINT_point2oct(srvr_group,
2149                                         EC_KEY_get0_public_key(clnt_ecdh),
2150                                         POINT_CONVERSION_UNCOMPRESSED,
2151                                         NULL, 0, NULL);
2152
2153                                 encodedPoint = (unsigned char *)
2154                                     OPENSSL_malloc(encoded_pt_len *
2155                                         sizeof(unsigned char));
2156                                 bn_ctx = BN_CTX_new();
2157                                 if ((encodedPoint == NULL) ||
2158                                     (bn_ctx == NULL))
2159                                         {
2160                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2161                                         goto err;
2162                                         }
2163
2164                                 /* Encode the public key */
2165                                 n = EC_POINT_point2oct(srvr_group,
2166                                     EC_KEY_get0_public_key(clnt_ecdh),
2167                                     POINT_CONVERSION_UNCOMPRESSED,
2168                                     encodedPoint, encoded_pt_len, bn_ctx);
2169
2170                                 *p = n; /* length of encoded point */
2171                                 /* Encoded point will be copied here */
2172                                 p += 1;
2173                                 /* copy the point */
2174                                 memcpy((unsigned char *)p, encodedPoint, n);
2175                                 /* increment n to account for length field */
2176                                 n += 1;
2177                                 }
2178
2179                         /* Free allocated memory */
2180                         BN_CTX_free(bn_ctx);
2181                         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2182                         if (clnt_ecdh != NULL)
2183                                  EC_KEY_free(clnt_ecdh);
2184                         EVP_PKEY_free(srvr_pub_pkey);
2185                         }
2186 #endif /* !OPENSSL_NO_ECDH */
2187 #ifndef OPENSSL_NO_PSK
2188                 else if (alg_k & SSL_kPSK)
2189                         {
2190                         char identity[PSK_MAX_IDENTITY_LEN];
2191                         unsigned char *t = NULL;
2192                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
2193                         unsigned int pre_ms_len = 0, psk_len = 0;
2194                         int psk_err = 1;
2195
2196                         n = 0;
2197                         if (s->psk_client_callback == NULL)
2198                                 {
2199                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2200                                         SSL_R_PSK_NO_CLIENT_CB);
2201                                 goto err;
2202                                 }
2203
2204                         psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint,
2205                                 identity, PSK_MAX_IDENTITY_LEN,
2206                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
2207                         if (psk_len > PSK_MAX_PSK_LEN)
2208                                 {
2209                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2210                                         ERR_R_INTERNAL_ERROR);
2211                                 goto psk_err;
2212                                 }
2213                         else if (psk_len == 0)
2214                                 {
2215                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2216                                         SSL_R_PSK_IDENTITY_NOT_FOUND);
2217                                 goto psk_err;
2218                                 }
2219
2220                         /* create PSK pre_master_secret */
2221                         pre_ms_len = 2+psk_len+2+psk_len;
2222                         t = psk_or_pre_ms;
2223                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
2224                         s2n(psk_len, t);
2225                         memset(t, 0, psk_len);
2226                         t+=psk_len;
2227                         s2n(psk_len, t);
2228
2229                         if (s->session->psk_identity_hint != NULL)
2230                                 OPENSSL_free(s->session->psk_identity_hint);
2231                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
2232                         if (s->ctx->psk_identity_hint != NULL &&
2233                                 s->session->psk_identity_hint == NULL)
2234                                 {
2235                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2236                                         ERR_R_MALLOC_FAILURE);
2237                                 goto psk_err;
2238                                 }
2239
2240                         if (s->session->psk_identity != NULL)
2241                                 OPENSSL_free(s->session->psk_identity);
2242                         s->session->psk_identity = BUF_strdup(identity);
2243                         if (s->session->psk_identity == NULL)
2244                                 {
2245                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2246                                         ERR_R_MALLOC_FAILURE);
2247                                 goto psk_err;
2248                                 }
2249
2250                         s->session->master_key_length =
2251                                 s->method->ssl3_enc->generate_master_secret(s,
2252                                         s->session->master_key,
2253                                         psk_or_pre_ms, pre_ms_len);
2254                         n = strlen(identity);
2255                         s2n(n, p);
2256                         memcpy(p, identity, n);
2257                         n+=2;
2258                         psk_err = 0;
2259                 psk_err:
2260                         OPENSSL_cleanse(identity, PSK_MAX_IDENTITY_LEN);
2261                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
2262                         if (psk_err != 0)
2263                                 {
2264                                 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
2265                                 goto err;
2266                                 }
2267                         }
2268 #endif
2269                 else
2270                         {
2271                         ssl3_send_alert(s, SSL3_AL_FATAL,
2272                             SSL_AD_HANDSHAKE_FAILURE);
2273                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2274                             ERR_R_INTERNAL_ERROR);
2275                         goto err;
2276                         }
2277
2278                 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
2279                 l2n3(n,d);
2280
2281                 s->state=SSL3_ST_CW_KEY_EXCH_B;
2282                 /* number of bytes to write */
2283                 s->init_num=n+4;
2284                 s->init_off=0;
2285                 }
2286
2287         /* SSL3_ST_CW_KEY_EXCH_B */
2288         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2289 err:
2290 #ifndef OPENSSL_NO_ECDH
2291         BN_CTX_free(bn_ctx);
2292         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2293         if (clnt_ecdh != NULL)
2294                 EC_KEY_free(clnt_ecdh);
2295         EVP_PKEY_free(srvr_pub_pkey);
2296 #endif
2297         return(-1);
2298         }
2299
2300 int ssl3_send_client_verify(SSL *s)
2301         {
2302         unsigned char *p,*d;
2303         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
2304         EVP_PKEY *pkey;
2305 #ifndef OPENSSL_NO_RSA
2306         unsigned u=0;
2307 #endif
2308         unsigned long n;
2309 #if !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_ECDSA)
2310         int j;
2311 #endif
2312
2313         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
2314                 {
2315                 d=(unsigned char *)s->init_buf->data;
2316                 p= &(d[4]);
2317                 pkey=s->cert->key->privatekey;
2318
2319                 s->method->ssl3_enc->cert_verify_mac(s,&(s->s3->finish_dgst2),
2320                         &(data[MD5_DIGEST_LENGTH]));
2321
2322 #ifndef OPENSSL_NO_RSA
2323                 if (pkey->type == EVP_PKEY_RSA)
2324                         {
2325                         s->method->ssl3_enc->cert_verify_mac(s,
2326                                 &(s->s3->finish_dgst1),&(data[0]));
2327                         if (RSA_sign(NID_md5_sha1, data,
2328                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
2329                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
2330                                 {
2331                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
2332                                 goto err;
2333                                 }
2334                         s2n(u,p);
2335                         n=u+2;
2336                         }
2337                 else
2338 #endif
2339 #ifndef OPENSSL_NO_DSA
2340                         if (pkey->type == EVP_PKEY_DSA)
2341                         {
2342                         if (!DSA_sign(pkey->save_type,
2343                                 &(data[MD5_DIGEST_LENGTH]),
2344                                 SHA_DIGEST_LENGTH,&(p[2]),
2345                                 (unsigned int *)&j,pkey->pkey.dsa))
2346                                 {
2347                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
2348                                 goto err;
2349                                 }
2350                         s2n(j,p);
2351                         n=j+2;
2352                         }
2353                 else
2354 #endif
2355 #ifndef OPENSSL_NO_ECDSA
2356                         if (pkey->type == EVP_PKEY_EC)
2357                         {
2358                         if (!ECDSA_sign(pkey->save_type,
2359                                 &(data[MD5_DIGEST_LENGTH]),
2360                                 SHA_DIGEST_LENGTH,&(p[2]),
2361                                 (unsigned int *)&j,pkey->pkey.ec))
2362                                 {
2363                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
2364                                     ERR_R_ECDSA_LIB);
2365                                 goto err;
2366                                 }
2367                         s2n(j,p);
2368                         n=j+2;
2369                         }
2370                 else
2371 #endif
2372                         {
2373                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
2374                         goto err;
2375                         }
2376                 *(d++)=SSL3_MT_CERTIFICATE_VERIFY;
2377                 l2n3(n,d);
2378
2379                 s->state=SSL3_ST_CW_CERT_VRFY_B;
2380                 s->init_num=(int)n+4;
2381                 s->init_off=0;
2382                 }
2383         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2384 err:
2385         return(-1);
2386         }
2387
2388 int ssl3_send_client_certificate(SSL *s)
2389         {
2390         X509 *x509=NULL;
2391         EVP_PKEY *pkey=NULL;
2392         int i;
2393         unsigned long l;
2394
2395         if (s->state == SSL3_ST_CW_CERT_A)
2396                 {
2397                 if ((s->cert == NULL) ||
2398                         (s->cert->key->x509 == NULL) ||
2399                         (s->cert->key->privatekey == NULL))
2400                         s->state=SSL3_ST_CW_CERT_B;
2401                 else
2402                         s->state=SSL3_ST_CW_CERT_C;
2403                 }
2404
2405         /* We need to get a client cert */
2406         if (s->state == SSL3_ST_CW_CERT_B)
2407                 {
2408                 /* If we get an error, we need to
2409                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
2410                  * We then get retied later */
2411                 i=0;
2412                 if (s->ctx->client_cert_cb != NULL)
2413                         i=s->ctx->client_cert_cb(s,&(x509),&(pkey));
2414                 if (i < 0)
2415                         {
2416                         s->rwstate=SSL_X509_LOOKUP;
2417                         return(-1);
2418                         }
2419                 s->rwstate=SSL_NOTHING;
2420                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
2421                         {
2422                         s->state=SSL3_ST_CW_CERT_B;
2423                         if (    !SSL_use_certificate(s,x509) ||
2424                                 !SSL_use_PrivateKey(s,pkey))
2425                                 i=0;
2426                         }
2427                 else if (i == 1)
2428                         {
2429                         i=0;
2430                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
2431                         }
2432
2433                 if (x509 != NULL) X509_free(x509);
2434                 if (pkey != NULL) EVP_PKEY_free(pkey);
2435                 if (i == 0)
2436                         {
2437                         if (s->version == SSL3_VERSION)
2438                                 {
2439                                 s->s3->tmp.cert_req=0;
2440                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
2441                                 return(1);
2442                                 }
2443                         else
2444                                 {
2445                                 s->s3->tmp.cert_req=2;
2446                                 }
2447                         }
2448
2449                 /* Ok, we have a cert */
2450                 s->state=SSL3_ST_CW_CERT_C;
2451                 }
2452
2453         if (s->state == SSL3_ST_CW_CERT_C)
2454                 {
2455                 s->state=SSL3_ST_CW_CERT_D;
2456                 l=ssl3_output_cert_chain(s,
2457                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
2458                 s->init_num=(int)l;
2459                 s->init_off=0;
2460                 }
2461         /* SSL3_ST_CW_CERT_D */
2462         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2463         }
2464
2465 #define has_bits(i,m)   (((i)&(m)) == (m))
2466
2467 int ssl3_check_cert_and_algorithm(SSL *s)
2468         {
2469         int i,idx;
2470         long alg_k,alg_a;
2471         EVP_PKEY *pkey=NULL;
2472         SESS_CERT *sc;
2473 #ifndef OPENSSL_NO_RSA
2474         RSA *rsa;
2475 #endif
2476 #ifndef OPENSSL_NO_DH
2477         DH *dh;
2478 #endif
2479
2480         sc=s->session->sess_cert;
2481         if (sc == NULL)
2482                 {
2483                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,ERR_R_INTERNAL_ERROR);
2484                 goto err;
2485                 }
2486
2487         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2488         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
2489
2490         /* we don't have a certificate */
2491         if ((alg_a & (SSL_aDH|SSL_aNULL|SSL_aKRB5)) || (alg_k & SSL_kPSK))
2492                 return(1);
2493
2494 #ifndef OPENSSL_NO_RSA
2495         rsa=s->session->sess_cert->peer_rsa_tmp;
2496 #endif
2497 #ifndef OPENSSL_NO_DH
2498         dh=s->session->sess_cert->peer_dh_tmp;
2499 #endif
2500
2501         /* This is the passed certificate */
2502
2503         idx=sc->peer_cert_type;
2504 #ifndef OPENSSL_NO_ECDH
2505         if (idx == SSL_PKEY_ECC)
2506                 {
2507                 if (ssl_check_srvr_ecc_cert_and_alg(sc->peer_pkeys[idx].x509,
2508                     s->s3->tmp.new_cipher) == 0)
2509                         { /* check failed */
2510                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_BAD_ECC_CERT);
2511                         goto f_err;
2512                         }
2513                 else
2514                         {
2515                         return 1;
2516                         }
2517                 }
2518 #endif
2519         pkey=X509_get_pubkey(sc->peer_pkeys[idx].x509);
2520         i=X509_certificate_type(sc->peer_pkeys[idx].x509,pkey);
2521         EVP_PKEY_free(pkey);
2522
2523
2524         /* Check that we have a certificate if we require one */
2525         if ((alg_a & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
2526                 {
2527                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
2528                 goto f_err;
2529                 }
2530 #ifndef OPENSSL_NO_DSA
2531         else if ((alg_a & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
2532                 {
2533                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
2534                 goto f_err;
2535                 }
2536 #endif
2537 #ifndef OPENSSL_NO_RSA
2538         if ((alg_k & SSL_kRSA) &&
2539                 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
2540                 {
2541                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
2542                 goto f_err;
2543                 }
2544 #endif
2545 #ifndef OPENSSL_NO_DH
2546         if ((alg_k & SSL_kEDH) &&
2547                 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
2548                 {
2549                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
2550                 goto f_err;
2551                 }
2552         else if ((alg_k & SSL_kDHr) && !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
2553                 {
2554                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
2555                 goto f_err;
2556                 }
2557 #ifndef OPENSSL_NO_DSA
2558         else if ((alg_k & SSL_kDHd) && !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
2559                 {
2560                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
2561                 goto f_err;
2562                 }
2563 #endif
2564 #endif
2565
2566         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i,EVP_PKT_EXP))
2567                 {
2568 #ifndef OPENSSL_NO_RSA
2569                 if (alg_k & SSL_kRSA)
2570                         {
2571                         if (rsa == NULL
2572                             || RSA_size(rsa)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
2573                                 {
2574                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
2575                                 goto f_err;
2576                                 }
2577                         }
2578                 else
2579 #endif
2580 #ifndef OPENSSL_NO_DH
2581                         if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2582                             {
2583                             if (dh == NULL
2584                                 || DH_size(dh)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
2585                                 {
2586                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
2587                                 goto f_err;
2588                                 }
2589                         }
2590                 else
2591 #endif
2592                         {
2593                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
2594                         goto f_err;
2595                         }
2596                 }
2597         return(1);
2598 f_err:
2599         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
2600 err:
2601         return(0);
2602         }