crypto/openssl-0.9/ssl/s3_clnt.c

   1 /* ssl/s3_clnt.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58 /* ====================================================================
  59  * Copyright (c) 1998-2003 The OpenSSL Project.  All rights reserved.
  60  *
  61  * Redistribution and use in source and binary forms, with or without
  62  * modification, are permitted provided that the following conditions
  63  * are met:
  64  *
  65  * 1. Redistributions of source code must retain the above copyright
  66  *    notice, this list of conditions and the following disclaimer.
  67  *
  68  * 2. Redistributions in binary form must reproduce the above copyright
  69  *    notice, this list of conditions and the following disclaimer in
  70  *    the documentation and/or other materials provided with the
  71  *    distribution.
  72  *
  73  * 3. All advertising materials mentioning features or use of this
  74  *    software must display the following acknowledgment:
  75  *    "This product includes software developed by the OpenSSL Project
  76  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  77  *
  78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  79  *    endorse or promote products derived from this software without
  80  *    prior written permission. For written permission, please contact
  81  *    openssl-core@openssl.org.
  82  *
  83  * 5. Products derived from this software may not be called "OpenSSL"
  84  *    nor may "OpenSSL" appear in their names without prior written
  85  *    permission of the OpenSSL Project.
  86  *
  87  * 6. Redistributions of any form whatsoever must retain the following
  88  *    acknowledgment:
  89  *    "This product includes software developed by the OpenSSL Project
  90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  91  *
  92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  95  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 103  * OF THE POSSIBILITY OF SUCH DAMAGE.
 104  * ====================================================================
 105  *
 106  * This product includes cryptographic software written by Eric Young
 107  * (eay@cryptsoft.com).  This product includes software written by Tim
 108  * Hudson (tjh@cryptsoft.com).
 109  *
 110  */
 111 /* ====================================================================
 112  * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
 113  *
 114  * Portions of the attached software ("Contribution") are developed by
 115  * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
 116  *
 117  * The Contribution is licensed pursuant to the OpenSSL open source
 118  * license provided above.
 119  *
 120  * ECC cipher suite support in OpenSSL originally written by
 121  * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories.
 122  *
 123  */
 124
 125 #include <stdio.h>
 126 #include "ssl_locl.h"
 127 #include "kssl_lcl.h"
 128 #include <openssl/buffer.h>
 129 #include <openssl/rand.h>
 130 #include <openssl/objects.h>
 131 #include <openssl/evp.h>
 132 #include <openssl/md5.h>
 133 #ifndef OPENSSL_NO_DH
 134 #include <openssl/dh.h>
 135 #endif
 136 #include <openssl/bn.h>
 137
 138 static SSL_METHOD *ssl3_get_client_method(int ver);
 139 static int ca_dn_cmp(const X509_NAME * const *a,const X509_NAME * const *b);
 140 #ifndef OPENSSL_NO_TLSEXT
 141 static int ssl3_check_finished(SSL *s);
 142 #endif
 143
 144 #ifndef OPENSSL_NO_ECDH
 145 static int curve_id2nid(int curve_id);
 146 int check_srvr_ecc_cert_and_alg(X509 *x, SSL_CIPHER *cs);
 147 #endif
 148
 149 static SSL_METHOD *ssl3_get_client_method(int ver)
 150         {
 151         if (ver == SSL3_VERSION)
 152                 return(SSLv3_client_method());
 153         else
 154                 return(NULL);
 155         }
 156
 157 IMPLEMENT_ssl3_meth_func(SSLv3_client_method,
 158                         ssl_undefined_function,
 159                         ssl3_connect,
 160                         ssl3_get_client_method)
 161
 162 int ssl3_connect(SSL *s)
 163         {
 164         BUF_MEM *buf=NULL;
 165         unsigned long Time=(unsigned long)time(NULL),l;
 166         long num1;
 167         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 168         int ret= -1;
 169         int new_state,state,skip=0;;
 170
 171         RAND_add(&Time,sizeof(Time),0);
 172         ERR_clear_error();
 173         clear_sys_error();
 174
 175         if (s->info_callback != NULL)
 176                 cb=s->info_callback;
 177         else if (s->ctx->info_callback != NULL)
 178                 cb=s->ctx->info_callback;
 179
 180         s->in_handshake++;
 181         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 182
 183         for (;;)
 184                 {
 185                 state=s->state;
 186
 187                 switch(s->state)
 188                         {
 189                 case SSL_ST_RENEGOTIATE:
 190                         s->new_session=1;
 191                         s->state=SSL_ST_CONNECT;
 192                         s->ctx->stats.sess_connect_renegotiate++;
 193                         /* break */
 194                 case SSL_ST_BEFORE:
 195                 case SSL_ST_CONNECT:
 196                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 197                 case SSL_ST_OK|SSL_ST_CONNECT:
 198
 199                         s->server=0;
 200                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 201
 202                         if ((s->version & 0xff00 ) != 0x0300)
 203                                 {
 204                                 SSLerr(SSL_F_SSL3_CONNECT, ERR_R_INTERNAL_ERROR);
 205                                 ret = -1;
 206                                 goto end;
 207                                 }
 208
 209                         /* s->version=SSL3_VERSION; */
 210                         s->type=SSL_ST_CONNECT;
 211
 212                         if (s->init_buf == NULL)
 213                                 {
 214                                 if ((buf=BUF_MEM_new()) == NULL)
 215                                         {
 216                                         ret= -1;
 217                                         goto end;
 218                                         }
 219                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 220                                         {
 221                                         ret= -1;
 222                                         goto end;
 223                                         }
 224                                 s->init_buf=buf;
 225                                 buf=NULL;
 226                                 }
 227
 228                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
 229
 230                         /* setup buffing BIO */
 231                         if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
 232
 233                         /* don't push the buffering BIO quite yet */
 234
 235                         ssl3_init_finished_mac(s);
 236
 237                         s->state=SSL3_ST_CW_CLNT_HELLO_A;
 238                         s->ctx->stats.sess_connect++;
 239                         s->init_num=0;
 240                         break;
 241
 242                 case SSL3_ST_CW_CLNT_HELLO_A:
 243                 case SSL3_ST_CW_CLNT_HELLO_B:
 244
 245                         s->shutdown=0;
 246                         ret=ssl3_client_hello(s);
 247                         if (ret <= 0) goto end;
 248                         s->state=SSL3_ST_CR_SRVR_HELLO_A;
 249                         s->init_num=0;
 250
 251                         /* turn on buffering for the next lot of output */
 252                         if (s->bbio != s->wbio)
 253                                 s->wbio=BIO_push(s->bbio,s->wbio);
 254
 255                         break;
 256
 257                 case SSL3_ST_CR_SRVR_HELLO_A:
 258                 case SSL3_ST_CR_SRVR_HELLO_B:
 259                         ret=ssl3_get_server_hello(s);
 260                         if (ret <= 0) goto end;
 261                         if (s->hit)
 262                                 s->state=SSL3_ST_CR_FINISHED_A;
 263                         else
 264                                 s->state=SSL3_ST_CR_CERT_A;
 265                         s->init_num=0;
 266                         break;
 267
 268                 case SSL3_ST_CR_CERT_A:
 269                 case SSL3_ST_CR_CERT_B:
 270 #ifndef OPENSSL_NO_TLSEXT
 271                         ret=ssl3_check_finished(s);
 272                         if (ret <= 0) goto end;
 273                         if (ret == 2)
 274                                 {
 275                                 s->hit = 1;
 276                                 s->state=SSL3_ST_CR_FINISHED_A;
 277                                 s->init_num=0;
 278                                 break;
 279                                 }
 280 #endif
 281                         /* Check if it is anon DH/ECDH */
 282                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 283                                 {
 284                                 ret=ssl3_get_server_certificate(s);
 285                                 if (ret <= 0) goto end;
 286                                 }
 287                         else
 288                                 skip=1;
 289                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 290                         s->init_num=0;
 291                         break;
 292
 293                 case SSL3_ST_CR_KEY_EXCH_A:
 294                 case SSL3_ST_CR_KEY_EXCH_B:
 295                         ret=ssl3_get_key_exchange(s);
 296                         if (ret <= 0) goto end;
 297                         s->state=SSL3_ST_CR_CERT_REQ_A;
 298                         s->init_num=0;
 299
 300                         /* at this point we check that we have the
 301                          * required stuff from the server */
 302                         if (!ssl3_check_cert_and_algorithm(s))
 303                                 {
 304                                 ret= -1;
 305                                 goto end;
 306                                 }
 307                         break;
 308
 309                 case SSL3_ST_CR_CERT_REQ_A:
 310                 case SSL3_ST_CR_CERT_REQ_B:
 311                         ret=ssl3_get_certificate_request(s);
 312                         if (ret <= 0) goto end;
 313                         s->state=SSL3_ST_CR_SRVR_DONE_A;
 314                         s->init_num=0;
 315                         break;
 316
 317                 case SSL3_ST_CR_SRVR_DONE_A:
 318                 case SSL3_ST_CR_SRVR_DONE_B:
 319                         ret=ssl3_get_server_done(s);
 320                         if (ret <= 0) goto end;
 321                         if (s->s3->tmp.cert_req)
 322                                 s->state=SSL3_ST_CW_CERT_A;
 323                         else
 324                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
 325                         s->init_num=0;
 326
 327                         break;
 328
 329                 case SSL3_ST_CW_CERT_A:
 330                 case SSL3_ST_CW_CERT_B:
 331                 case SSL3_ST_CW_CERT_C:
 332                 case SSL3_ST_CW_CERT_D:
 333                         ret=ssl3_send_client_certificate(s);
 334                         if (ret <= 0) goto end;
 335                         s->state=SSL3_ST_CW_KEY_EXCH_A;
 336                         s->init_num=0;
 337                         break;
 338
 339                 case SSL3_ST_CW_KEY_EXCH_A:
 340                 case SSL3_ST_CW_KEY_EXCH_B:
 341                         ret=ssl3_send_client_key_exchange(s);
 342                         if (ret <= 0) goto end;
 343                         l=s->s3->tmp.new_cipher->algorithms;
 344                         /* EAY EAY EAY need to check for DH fix cert
 345                          * sent back */
 346                         /* For TLS, cert_req is set to 2, so a cert chain
 347                          * of nothing is sent, but no verify packet is sent */
 348                         /* XXX: For now, we do not support client
 349                          * authentication in ECDH cipher suites with
 350                          * ECDH (rather than ECDSA) certificates.
 351                          * We need to skip the certificate verify
 352                          * message when client's ECDH public key is sent
 353                          * inside the client certificate.
 354                          */
 355                         if (s->s3->tmp.cert_req == 1)
 356                                 {
 357                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
 358                                 }
 359                         else
 360                                 {
 361                                 s->state=SSL3_ST_CW_CHANGE_A;
 362                                 s->s3->change_cipher_spec=0;
 363                                 }
 364
 365                         s->init_num=0;
 366                         break;
 367
 368                 case SSL3_ST_CW_CERT_VRFY_A:
 369                 case SSL3_ST_CW_CERT_VRFY_B:
 370                         ret=ssl3_send_client_verify(s);
 371                         if (ret <= 0) goto end;
 372                         s->state=SSL3_ST_CW_CHANGE_A;
 373                         s->init_num=0;
 374                         s->s3->change_cipher_spec=0;
 375                         break;
 376
 377                 case SSL3_ST_CW_CHANGE_A:
 378                 case SSL3_ST_CW_CHANGE_B:
 379                         ret=ssl3_send_change_cipher_spec(s,
 380                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
 381                         if (ret <= 0) goto end;
 382                         s->state=SSL3_ST_CW_FINISHED_A;
 383                         s->init_num=0;
 384
 385                         s->session->cipher=s->s3->tmp.new_cipher;
 386 #ifdef OPENSSL_NO_COMP
 387                         s->session->compress_meth=0;
 388 #else
 389                         if (s->s3->tmp.new_compression == NULL)
 390                                 s->session->compress_meth=0;
 391                         else
 392                                 s->session->compress_meth=
 393                                         s->s3->tmp.new_compression->id;
 394 #endif
 395                         if (!s->method->ssl3_enc->setup_key_block(s))
 396                                 {
 397                                 ret= -1;
 398                                 goto end;
 399                                 }
 400
 401                         if (!s->method->ssl3_enc->change_cipher_state(s,
 402                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 403                                 {
 404                                 ret= -1;
 405                                 goto end;
 406                                 }
 407
 408                         break;
 409
 410                 case SSL3_ST_CW_FINISHED_A:
 411                 case SSL3_ST_CW_FINISHED_B:
 412                         ret=ssl3_send_finished(s,
 413                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
 414                                 s->method->ssl3_enc->client_finished_label,
 415                                 s->method->ssl3_enc->client_finished_label_len);
 416                         if (ret <= 0) goto end;
 417                         s->state=SSL3_ST_CW_FLUSH;
 418
 419                         /* clear flags */
 420                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
 421                         if (s->hit)
 422                                 {
 423                                 s->s3->tmp.next_state=SSL_ST_OK;
 424                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
 425                                         {
 426                                         s->state=SSL_ST_OK;
 427                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
 428                                         s->s3->delay_buf_pop_ret=0;
 429                                         }
 430                                 }
 431                         else
 432                                 {
 433 #ifndef OPENSSL_NO_TLSEXT
 434                                 /* Allow NewSessionTicket if ticket expected */
 435                                 if (s->tlsext_ticket_expected)
 436                                         s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A;
 437                                 else
 438 #endif
 439
 440                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
 441                                 }
 442                         s->init_num=0;
 443                         break;
 444
 445 #ifndef OPENSSL_NO_TLSEXT
 446                 case SSL3_ST_CR_SESSION_TICKET_A:
 447                 case SSL3_ST_CR_SESSION_TICKET_B:
 448                         ret=ssl3_get_new_session_ticket(s);
 449                         if (ret <= 0) goto end;
 450                         s->state=SSL3_ST_CR_FINISHED_A;
 451                         s->init_num=0;
 452                 break;
 453 #endif
 454
 455                 case SSL3_ST_CR_FINISHED_A:
 456                 case SSL3_ST_CR_FINISHED_B:
 457
 458                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
 459                                 SSL3_ST_CR_FINISHED_B);
 460                         if (ret <= 0) goto end;
 461
 462                         if (s->hit)
 463                                 s->state=SSL3_ST_CW_CHANGE_A;
 464                         else
 465                                 s->state=SSL_ST_OK;
 466                         s->init_num=0;
 467                         break;
 468
 469                 case SSL3_ST_CW_FLUSH:
 470                         /* number of bytes to be flushed */
 471                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 472                         if (num1 > 0)
 473                                 {
 474                                 s->rwstate=SSL_WRITING;
 475                                 num1=BIO_flush(s->wbio);
 476                                 if (num1 <= 0) { ret= -1; goto end; }
 477                                 s->rwstate=SSL_NOTHING;
 478                                 }
 479
 480                         s->state=s->s3->tmp.next_state;
 481                         break;
 482
 483                 case SSL_ST_OK:
 484                         /* clean a few things up */
 485                         ssl3_cleanup_key_block(s);
 486
 487                         if (s->init_buf != NULL)
 488                                 {
 489                                 BUF_MEM_free(s->init_buf);
 490                                 s->init_buf=NULL;
 491                                 }
 492
 493                         /* If we are not 'joining' the last two packets,
 494                          * remove the buffering now */
 495                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 496                                 ssl_free_wbio_buffer(s);
 497                         /* else do it later in ssl3_write */
 498
 499                         s->init_num=0;
 500                         s->new_session=0;
 501
 502                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 503                         if (s->hit) s->ctx->stats.sess_hit++;
 504
 505                         ret=1;
 506                         /* s->server=0; */
 507                         s->handshake_func=ssl3_connect;
 508                         s->ctx->stats.sess_connect_good++;
 509
 510                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 511
 512                         goto end;
 513                         /* break; */
 514
 515                 default:
 516                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_UNKNOWN_STATE);
 517                         ret= -1;
 518                         goto end;
 519                         /* break; */
 520                         }
 521
 522                 /* did we do anything */
 523                 if (!s->s3->tmp.reuse_message && !skip)
 524                         {
 525                         if (s->debug)
 526                                 {
 527                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 528                                         goto end;
 529                                 }
 530
 531                         if ((cb != NULL) && (s->state != state))
 532                                 {
 533                                 new_state=s->state;
 534                                 s->state=state;
 535                                 cb(s,SSL_CB_CONNECT_LOOP,1);
 536                                 s->state=new_state;
 537                                 }
 538                         }
 539                 skip=0;
 540                 }
 541 end:
 542         s->in_handshake--;
 543         if (buf != NULL)
 544                 BUF_MEM_free(buf);
 545         if (cb != NULL)
 546                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 547         return(ret);
 548         }
 549
 550
 551 int ssl3_client_hello(SSL *s)
 552         {
 553         unsigned char *buf;
 554         unsigned char *p,*d;
 555         int i;
 556         unsigned long Time,l;
 557 #ifndef OPENSSL_NO_COMP
 558         int j;
 559         SSL_COMP *comp;
 560 #endif
 561
 562         buf=(unsigned char *)s->init_buf->data;
 563         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
 564                 {
 565                 if ((s->session == NULL) ||
 566                         (s->session->ssl_version != s->version) ||
 567                         (s->session->not_resumable))
 568                         {
 569                         if (!ssl_get_new_session(s,0))
 570                                 goto err;
 571                         }
 572                 /* else use the pre-loaded session */
 573
 574                 p=s->s3->client_random;
 575                 Time=(unsigned long)time(NULL);                 /* Time */
 576                 l2n(Time,p);
 577                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
 578                         goto err;
 579
 580                 /* Do the message type and length last */
 581                 d=p= &(buf[4]);
 582
 583                 *(p++)=s->version>>8;
 584                 *(p++)=s->version&0xff;
 585                 s->client_version=s->version;
 586
 587                 /* Random stuff */
 588                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 589                 p+=SSL3_RANDOM_SIZE;
 590
 591                 /* Session ID */
 592                 if (s->new_session)
 593                         i=0;
 594                 else
 595                         i=s->session->session_id_length;
 596                 *(p++)=i;
 597                 if (i != 0)
 598                         {
 599                         if (i > (int)sizeof(s->session->session_id))
 600                                 {
 601                                 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 602                                 goto err;
 603                                 }
 604                         memcpy(p,s->session->session_id,i);
 605                         p+=i;
 606                         }
 607
 608                 /* Ciphers supported */
 609                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
 610                 if (i == 0)
 611                         {
 612                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 613                         goto err;
 614                         }
 615                 s2n(i,p);
 616                 p+=i;
 617
 618                 /* COMPRESSION */
 619 #ifdef OPENSSL_NO_COMP
 620                 *(p++)=1;
 621 #else
 622                 if (s->ctx->comp_methods == NULL)
 623                         j=0;
 624                 else
 625                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
 626                 *(p++)=1+j;
 627                 for (i=0; i<j; i++)
 628                         {
 629                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
 630                         *(p++)=comp->id;
 631                         }
 632 #endif
 633                 *(p++)=0; /* Add the NULL method */
 634 #ifndef OPENSSL_NO_TLSEXT
 635                 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
 636                         {
 637                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
 638                         goto err;
 639                         }
 640 #endif
 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                 20000, /* ?? */
 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)
 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_GET_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
 837                                 goto err;
 838                         }
 839                 }
 840 #endif
 841
 842
 843         if (p != (d+n))
 844                 {
 845                 /* wrong packet length */
 846                 al=SSL_AD_DECODE_ERROR;
 847                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
 848                 goto err;
 849                 }
 850
 851         return(1);
 852 f_err:
 853         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 854 err:
 855         return(-1);
 856         }
 857
 858 int ssl3_get_server_certificate(SSL *s)
 859         {
 860         int al,i,ok,ret= -1;
 861         unsigned long n,nc,llen,l;
 862         X509 *x=NULL;
 863         const unsigned char *q,*p;
 864         unsigned char *d;
 865         STACK_OF(X509) *sk=NULL;
 866         SESS_CERT *sc;
 867         EVP_PKEY *pkey=NULL;
 868         int need_cert = 1; /* VRS: 0=> will allow null cert if auth == KRB5 */
 869
 870         n=s->method->ssl_get_message(s,
 871                 SSL3_ST_CR_CERT_A,
 872                 SSL3_ST_CR_CERT_B,
 873                 -1,
 874                 s->max_cert_list,
 875                 &ok);
 876
 877         if (!ok) return((int)n);
 878
 879         if ((s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) ||
 880                 ((s->s3->tmp.new_cipher->algorithms & SSL_aKRB5) &&
 881                 (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)))
 882                 {
 883                 s->s3->tmp.reuse_message=1;
 884                 return(1);
 885                 }
 886
 887         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
 888                 {
 889                 al=SSL_AD_UNEXPECTED_MESSAGE;
 890                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
 891                 goto f_err;
 892                 }
 893         p=d=(unsigned char *)s->init_msg;
 894
 895         if ((sk=sk_X509_new_null()) == NULL)
 896                 {
 897                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
 898                 goto err;
 899                 }
 900
 901         n2l3(p,llen);
 902         if (llen+3 != n)
 903                 {
 904                 al=SSL_AD_DECODE_ERROR;
 905                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
 906                 goto f_err;
 907                 }
 908         for (nc=0; nc<llen; )
 909                 {
 910                 n2l3(p,l);
 911                 if ((l+nc+3) > llen)
 912                         {
 913                         al=SSL_AD_DECODE_ERROR;
 914                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
 915                         goto f_err;
 916                         }
 917
 918                 q=p;
 919                 x=d2i_X509(NULL,&q,l);
 920                 if (x == NULL)
 921                         {
 922                         al=SSL_AD_BAD_CERTIFICATE;
 923                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
 924                         goto f_err;
 925                         }
 926                 if (q != (p+l))
 927                         {
 928                         al=SSL_AD_DECODE_ERROR;
 929                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
 930                         goto f_err;
 931                         }
 932                 if (!sk_X509_push(sk,x))
 933                         {
 934                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
 935                         goto err;
 936                         }
 937                 x=NULL;
 938                 nc+=l+3;
 939                 p=q;
 940                 }
 941
 942         i=ssl_verify_cert_chain(s,sk);
 943         if ((s->verify_mode != SSL_VERIFY_NONE) && (!i)
 944 #ifndef OPENSSL_NO_KRB5
 945                 && (s->s3->tmp.new_cipher->algorithms & (SSL_MKEY_MASK|SSL_AUTH_MASK))
 946                 != (SSL_aKRB5|SSL_kKRB5)
 947 #endif /* OPENSSL_NO_KRB5 */
 948                 )
 949                 {
 950                 al=ssl_verify_alarm_type(s->verify_result);
 951                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
 952                 goto f_err;
 953                 }
 954         ERR_clear_error(); /* but we keep s->verify_result */
 955
 956         sc=ssl_sess_cert_new();
 957         if (sc == NULL) goto err;
 958
 959         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
 960         s->session->sess_cert=sc;
 961
 962         sc->cert_chain=sk;
 963         /* Inconsistency alert: cert_chain does include the peer's
 964          * certificate, which we don't include in s3_srvr.c */
 965         x=sk_X509_value(sk,0);
 966         sk=NULL;
 967         /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/
 968
 969         pkey=X509_get_pubkey(x);
 970
 971         /* VRS: allow null cert if auth == KRB5 */
 972         need_cert =     ((s->s3->tmp.new_cipher->algorithms
 973                          & (SSL_MKEY_MASK|SSL_AUTH_MASK))
 974                          == (SSL_aKRB5|SSL_kKRB5))? 0: 1;
 975
 976 #ifdef KSSL_DEBUG
 977         printf("pkey,x = %p, %p\n", pkey,x);
 978         printf("ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x,pkey));
 979         printf("cipher, alg, nc = %s, %lx, %d\n", s->s3->tmp.new_cipher->name,
 980                 s->s3->tmp.new_cipher->algorithms, need_cert);
 981 #endif    /* KSSL_DEBUG */
 982
 983         if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey)))
 984                 {
 985                 x=NULL;
 986                 al=SSL3_AL_FATAL;
 987                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
 988                         SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
 989                 goto f_err;
 990                 }
 991
 992         i=ssl_cert_type(x,pkey);
 993         if (need_cert && i < 0)
 994                 {
 995                 x=NULL;
 996                 al=SSL3_AL_FATAL;
 997                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
 998                         SSL_R_UNKNOWN_CERTIFICATE_TYPE);
 999                 goto f_err;
1000                 }
1001
1002         if (need_cert)
1003                 {
1004                 sc->peer_cert_type=i;
1005                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1006                 /* Why would the following ever happen?
1007                  * We just created sc a couple of lines ago. */
1008                 if (sc->peer_pkeys[i].x509 != NULL)
1009                         X509_free(sc->peer_pkeys[i].x509);
1010                 sc->peer_pkeys[i].x509=x;
1011                 sc->peer_key= &(sc->peer_pkeys[i]);
1012
1013                 if (s->session->peer != NULL)
1014                         X509_free(s->session->peer);
1015                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1016                 s->session->peer=x;
1017                 }
1018         else
1019                 {
1020                 sc->peer_cert_type=i;
1021                 sc->peer_key= NULL;
1022
1023                 if (s->session->peer != NULL)
1024                         X509_free(s->session->peer);
1025                 s->session->peer=NULL;
1026                 }
1027         s->session->verify_result = s->verify_result;
1028
1029         x=NULL;
1030         ret=1;
1031
1032         if (0)
1033                 {
1034 f_err:
1035                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1036                 }
1037 err:
1038         EVP_PKEY_free(pkey);
1039         X509_free(x);
1040         sk_X509_pop_free(sk,X509_free);
1041         return(ret);
1042         }
1043
1044 int ssl3_get_key_exchange(SSL *s)
1045         {
1046 #ifndef OPENSSL_NO_RSA
1047         unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
1048 #endif
1049         EVP_MD_CTX md_ctx;
1050         unsigned char *param,*p;
1051         int al,i,j,param_len,ok;
1052         long n,alg;
1053         EVP_PKEY *pkey=NULL;
1054 #ifndef OPENSSL_NO_RSA
1055         RSA *rsa=NULL;
1056 #endif
1057 #ifndef OPENSSL_NO_DH
1058         DH *dh=NULL;
1059 #endif
1060 #ifndef OPENSSL_NO_ECDH
1061         EC_KEY *ecdh = NULL;
1062         BN_CTX *bn_ctx = NULL;
1063         EC_POINT *srvr_ecpoint = NULL;
1064         int curve_nid = 0;
1065         int encoded_pt_len = 0;
1066 #endif
1067
1068         /* use same message size as in ssl3_get_certificate_request()
1069          * as ServerKeyExchange message may be skipped */
1070         n=s->method->ssl_get_message(s,
1071                 SSL3_ST_CR_KEY_EXCH_A,
1072                 SSL3_ST_CR_KEY_EXCH_B,
1073                 -1,
1074                 s->max_cert_list,
1075                 &ok);
1076
1077         if (!ok) return((int)n);
1078
1079         if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
1080                 {
1081                 s->s3->tmp.reuse_message=1;
1082                 return(1);
1083                 }
1084
1085         param=p=(unsigned char *)s->init_msg;
1086
1087         if (s->session->sess_cert != NULL)
1088                 {
1089 #ifndef OPENSSL_NO_RSA
1090                 if (s->session->sess_cert->peer_rsa_tmp != NULL)
1091                         {
1092                         RSA_free(s->session->sess_cert->peer_rsa_tmp);
1093                         s->session->sess_cert->peer_rsa_tmp=NULL;
1094                         }
1095 #endif
1096 #ifndef OPENSSL_NO_DH
1097                 if (s->session->sess_cert->peer_dh_tmp)
1098                         {
1099                         DH_free(s->session->sess_cert->peer_dh_tmp);
1100                         s->session->sess_cert->peer_dh_tmp=NULL;
1101                         }
1102 #endif
1103 #ifndef OPENSSL_NO_ECDH
1104                 if (s->session->sess_cert->peer_ecdh_tmp)
1105                         {
1106                         EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp);
1107                         s->session->sess_cert->peer_ecdh_tmp=NULL;
1108                         }
1109 #endif
1110                 }
1111         else
1112                 {
1113                 s->session->sess_cert=ssl_sess_cert_new();
1114                 }
1115
1116         param_len=0;
1117         alg=s->s3->tmp.new_cipher->algorithms;
1118         EVP_MD_CTX_init(&md_ctx);
1119
1120 #ifndef OPENSSL_NO_RSA
1121         if (alg & SSL_kRSA)
1122                 {
1123                 if ((rsa=RSA_new()) == NULL)
1124                         {
1125                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1126                         goto err;
1127                         }
1128                 n2s(p,i);
1129                 param_len=i+2;
1130                 if (param_len > n)
1131                         {
1132                         al=SSL_AD_DECODE_ERROR;
1133                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
1134                         goto f_err;
1135                         }
1136                 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
1137                         {
1138                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1139                         goto err;
1140                         }
1141                 p+=i;
1142
1143                 n2s(p,i);
1144                 param_len+=i+2;
1145                 if (param_len > n)
1146                         {
1147                         al=SSL_AD_DECODE_ERROR;
1148                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
1149                         goto f_err;
1150                         }
1151                 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
1152                         {
1153                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1154                         goto err;
1155                         }
1156                 p+=i;
1157                 n-=param_len;
1158
1159                 /* this should be because we are using an export cipher */
1160                 if (alg & SSL_aRSA)
1161                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1162                 else
1163                         {
1164                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1165                         goto err;
1166                         }
1167                 s->session->sess_cert->peer_rsa_tmp=rsa;
1168                 rsa=NULL;
1169                 }
1170 #else /* OPENSSL_NO_RSA */
1171         if (0)
1172                 ;
1173 #endif
1174 #ifndef OPENSSL_NO_DH
1175         else if (alg & SSL_kEDH)
1176                 {
1177                 if ((dh=DH_new()) == NULL)
1178                         {
1179                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
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_DH_P_LENGTH);
1188                         goto f_err;
1189                         }
1190                 if (!(dh->p=BN_bin2bn(p,i,NULL)))
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_DH_G_LENGTH);
1203                         goto f_err;
1204                         }
1205                 if (!(dh->g=BN_bin2bn(p,i,NULL)))
1206                         {
1207                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1208                         goto err;
1209                         }
1210                 p+=i;
1211
1212                 n2s(p,i);
1213                 param_len+=i+2;
1214                 if (param_len > n)
1215                         {
1216                         al=SSL_AD_DECODE_ERROR;
1217                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
1218                         goto f_err;
1219                         }
1220                 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
1221                         {
1222                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1223                         goto err;
1224                         }
1225                 p+=i;
1226                 n-=param_len;
1227
1228 #ifndef OPENSSL_NO_RSA
1229                 if (alg & SSL_aRSA)
1230                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1231 #else
1232                 if (0)
1233                         ;
1234 #endif
1235 #ifndef OPENSSL_NO_DSA
1236                 else if (alg & SSL_aDSS)
1237                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1238 #endif
1239                 /* else anonymous DH, so no certificate or pkey. */
1240
1241                 s->session->sess_cert->peer_dh_tmp=dh;
1242                 dh=NULL;
1243                 }
1244         else if ((alg & SSL_kDHr) || (alg & SSL_kDHd))
1245                 {
1246                 al=SSL_AD_ILLEGAL_PARAMETER;
1247                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1248                 goto f_err;
1249                 }
1250 #endif /* !OPENSSL_NO_DH */
1251
1252 #ifndef OPENSSL_NO_ECDH
1253         else if (alg & SSL_kECDHE)
1254                 {
1255                 EC_GROUP *ngroup;
1256                 const EC_GROUP *group;
1257
1258                 if ((ecdh=EC_KEY_new()) == NULL)
1259                         {
1260                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1261                         goto err;
1262                         }
1263
1264                 /* Extract elliptic curve parameters and the
1265                  * server's ephemeral ECDH public key.
1266                  * Keep accumulating lengths of various components in
1267                  * param_len and make sure it never exceeds n.
1268                  */
1269
1270                 /* XXX: For now we only support named (not generic) curves
1271                  * and the ECParameters in this case is just three bytes.
1272                  */
1273                 param_len=3;
1274                 if ((param_len > n) ||
1275                     (*p != NAMED_CURVE_TYPE) ||
1276                     ((curve_nid = curve_id2nid(*(p + 2))) == 0))
1277                         {
1278                         al=SSL_AD_INTERNAL_ERROR;
1279                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
1280                         goto f_err;
1281                         }
1282
1283                 ngroup = EC_GROUP_new_by_curve_name(curve_nid);
1284                 if (ngroup == NULL)
1285                         {
1286                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1287                         goto err;
1288                         }
1289                 if (EC_KEY_set_group(ecdh, ngroup) == 0)
1290                         {
1291                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1292                         goto err;
1293                         }
1294                 EC_GROUP_free(ngroup);
1295
1296                 group = EC_KEY_get0_group(ecdh);
1297
1298                 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1299                     (EC_GROUP_get_degree(group) > 163))
1300                         {
1301                         al=SSL_AD_EXPORT_RESTRICTION;
1302                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1303                         goto f_err;
1304                         }
1305
1306                 p+=3;
1307
1308                 /* Next, get the encoded ECPoint */
1309                 if (((srvr_ecpoint = EC_POINT_new(group)) == NULL) ||
1310                     ((bn_ctx = BN_CTX_new()) == NULL))
1311                         {
1312                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1313                         goto err;
1314                         }
1315
1316                 encoded_pt_len = *p;  /* length of encoded point */
1317                 p+=1;
1318                 param_len += (1 + encoded_pt_len);
1319                 if ((param_len > n) ||
1320                     (EC_POINT_oct2point(group, srvr_ecpoint,
1321                         p, encoded_pt_len, bn_ctx) == 0))
1322                         {
1323                         al=SSL_AD_DECODE_ERROR;
1324                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_ECPOINT);
1325                         goto f_err;
1326                         }
1327
1328                 n-=param_len;
1329                 p+=encoded_pt_len;
1330
1331                 /* The ECC/TLS specification does not mention
1332                  * the use of DSA to sign ECParameters in the server
1333                  * key exchange message. We do support RSA and ECDSA.
1334                  */
1335                 if (0) ;
1336 #ifndef OPENSSL_NO_RSA
1337                 else if (alg & SSL_aRSA)
1338                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1339 #endif
1340 #ifndef OPENSSL_NO_ECDSA
1341                 else if (alg & SSL_aECDSA)
1342                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1343 #endif
1344                 /* else anonymous ECDH, so no certificate or pkey. */
1345                 EC_KEY_set_public_key(ecdh, srvr_ecpoint);
1346                 s->session->sess_cert->peer_ecdh_tmp=ecdh;
1347                 ecdh=NULL;
1348                 BN_CTX_free(bn_ctx);
1349                 EC_POINT_free(srvr_ecpoint);
1350                 srvr_ecpoint = NULL;
1351                 }
1352         else if (alg & SSL_kECDH)
1353                 {
1354                 al=SSL_AD_UNEXPECTED_MESSAGE;
1355                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1356                 goto f_err;
1357                 }
1358 #endif /* !OPENSSL_NO_ECDH */
1359         if (alg & SSL_aFZA)
1360                 {
1361                 al=SSL_AD_HANDSHAKE_FAILURE;
1362                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1363                 goto f_err;
1364                 }
1365
1366
1367         /* p points to the next byte, there are 'n' bytes left */
1368
1369         /* if it was signed, check the signature */
1370         if (pkey != NULL)
1371                 {
1372                 n2s(p,i);
1373                 n-=2;
1374                 j=EVP_PKEY_size(pkey);
1375
1376                 if ((i != n) || (n > j) || (n <= 0))
1377                         {
1378                         /* wrong packet length */
1379                         al=SSL_AD_DECODE_ERROR;
1380                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1381                         goto f_err;
1382                         }
1383
1384 #ifndef OPENSSL_NO_RSA
1385                 if (pkey->type == EVP_PKEY_RSA)
1386                         {
1387                         int num;
1388
1389                         j=0;
1390                         q=md_buf;
1391                         for (num=2; num > 0; num--)
1392                                 {
1393                                 EVP_DigestInit_ex(&md_ctx,(num == 2)
1394                                         ?s->ctx->md5:s->ctx->sha1, NULL);
1395                                 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1396                                 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1397                                 EVP_DigestUpdate(&md_ctx,param,param_len);
1398                                 EVP_DigestFinal_ex(&md_ctx,q,(unsigned int *)&i);
1399                                 q+=i;
1400                                 j+=i;
1401                                 }
1402                         i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
1403                                                                 pkey->pkey.rsa);
1404                         if (i < 0)
1405                                 {
1406                                 al=SSL_AD_DECRYPT_ERROR;
1407                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1408                                 goto f_err;
1409                                 }
1410                         if (i == 0)
1411                                 {
1412                                 /* bad signature */
1413                                 al=SSL_AD_DECRYPT_ERROR;
1414                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1415                                 goto f_err;
1416                                 }
1417                         }
1418                 else
1419 #endif
1420 #ifndef OPENSSL_NO_DSA
1421                         if (pkey->type == EVP_PKEY_DSA)
1422                         {
1423                         /* lets do DSS */
1424                         EVP_VerifyInit_ex(&md_ctx,EVP_dss1(), NULL);
1425                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1426                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1427                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1428                         if (!EVP_VerifyFinal(&md_ctx,p,(int)n,pkey))
1429                                 {
1430                                 /* bad signature */
1431                                 al=SSL_AD_DECRYPT_ERROR;
1432                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1433                                 goto f_err;
1434                                 }
1435                         }
1436                 else
1437 #endif
1438 #ifndef OPENSSL_NO_ECDSA
1439                         if (pkey->type == EVP_PKEY_EC)
1440                         {
1441                         /* let's do ECDSA */
1442                         EVP_VerifyInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1443                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1444                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1445                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1446                         if (!EVP_VerifyFinal(&md_ctx,p,(int)n,pkey))
1447                                 {
1448                                 /* bad signature */
1449                                 al=SSL_AD_DECRYPT_ERROR;
1450                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1451                                 goto f_err;
1452                                 }
1453                         }
1454                 else
1455 #endif
1456                         {
1457                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1458                         goto err;
1459                         }
1460                 }
1461         else
1462                 {
1463                 /* still data left over */
1464                 if (!(alg & SSL_aNULL))
1465                         {
1466                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1467                         goto err;
1468                         }
1469                 if (n != 0)
1470                         {
1471                         al=SSL_AD_DECODE_ERROR;
1472                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
1473                         goto f_err;
1474                         }
1475                 }
1476         EVP_PKEY_free(pkey);
1477         EVP_MD_CTX_cleanup(&md_ctx);
1478         return(1);
1479 f_err:
1480         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1481 err:
1482         EVP_PKEY_free(pkey);
1483 #ifndef OPENSSL_NO_RSA
1484         if (rsa != NULL)
1485                 RSA_free(rsa);
1486 #endif
1487 #ifndef OPENSSL_NO_DH
1488         if (dh != NULL)
1489                 DH_free(dh);
1490 #endif
1491 #ifndef OPENSSL_NO_ECDH
1492         BN_CTX_free(bn_ctx);
1493         EC_POINT_free(srvr_ecpoint);
1494         if (ecdh != NULL)
1495                 EC_KEY_free(ecdh);
1496 #endif
1497         EVP_MD_CTX_cleanup(&md_ctx);
1498         return(-1);
1499         }
1500
1501 int ssl3_get_certificate_request(SSL *s)
1502         {
1503         int ok,ret=0;
1504         unsigned long n,nc,l;
1505         unsigned int llen,ctype_num,i;
1506         X509_NAME *xn=NULL;
1507         const unsigned char *p,*q;
1508         unsigned char *d;
1509         STACK_OF(X509_NAME) *ca_sk=NULL;
1510
1511         n=s->method->ssl_get_message(s,
1512                 SSL3_ST_CR_CERT_REQ_A,
1513                 SSL3_ST_CR_CERT_REQ_B,
1514                 -1,
1515                 s->max_cert_list,
1516                 &ok);
1517
1518         if (!ok) return((int)n);
1519
1520         s->s3->tmp.cert_req=0;
1521
1522         if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
1523                 {
1524                 s->s3->tmp.reuse_message=1;
1525                 return(1);
1526                 }
1527
1528         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
1529                 {
1530                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1531                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
1532                 goto err;
1533                 }
1534
1535         /* TLS does not like anon-DH with client cert */
1536         if (s->version > SSL3_VERSION)
1537                 {
1538                 l=s->s3->tmp.new_cipher->algorithms;
1539                 if (l & SSL_aNULL)
1540                         {
1541                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1542                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
1543                         goto err;
1544                         }
1545                 }
1546
1547         p=d=(unsigned char *)s->init_msg;
1548
1549         if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
1550                 {
1551                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1552                 goto err;
1553                 }
1554
1555         /* get the certificate types */
1556         ctype_num= *(p++);
1557         if (ctype_num > SSL3_CT_NUMBER)
1558                 ctype_num=SSL3_CT_NUMBER;
1559         for (i=0; i<ctype_num; i++)
1560                 s->s3->tmp.ctype[i]= p[i];
1561         p+=ctype_num;
1562
1563         /* get the CA RDNs */
1564         n2s(p,llen);
1565 #if 0
1566 {
1567 FILE *out;
1568 out=fopen("/tmp/vsign.der","w");
1569 fwrite(p,1,llen,out);
1570 fclose(out);
1571 }
1572 #endif
1573
1574         if ((llen+ctype_num+2+1) != n)
1575                 {
1576                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1577                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
1578                 goto err;
1579                 }
1580
1581         for (nc=0; nc<llen; )
1582                 {
1583                 n2s(p,l);
1584                 if ((l+nc+2) > llen)
1585                         {
1586                         if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1587                                 goto cont; /* netscape bugs */
1588                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1589                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
1590                         goto err;
1591                         }
1592
1593                 q=p;
1594
1595                 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
1596                         {
1597                         /* If netscape tolerance is on, ignore errors */
1598                         if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
1599                                 goto cont;
1600                         else
1601                                 {
1602                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1603                                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
1604                                 goto err;
1605                                 }
1606                         }
1607
1608                 if (q != (p+l))
1609                         {
1610                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1611                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
1612                         goto err;
1613                         }
1614                 if (!sk_X509_NAME_push(ca_sk,xn))
1615                         {
1616                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1617                         goto err;
1618                         }
1619
1620                 p+=l;
1621                 nc+=l+2;
1622                 }
1623
1624         if (0)
1625                 {
1626 cont:
1627                 ERR_clear_error();
1628                 }
1629
1630         /* we should setup a certificate to return.... */
1631         s->s3->tmp.cert_req=1;
1632         s->s3->tmp.ctype_num=ctype_num;
1633         if (s->s3->tmp.ca_names != NULL)
1634                 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
1635         s->s3->tmp.ca_names=ca_sk;
1636         ca_sk=NULL;
1637
1638         ret=1;
1639 err:
1640         if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
1641         return(ret);
1642         }
1643
1644 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
1645         {
1646         return(X509_NAME_cmp(*a,*b));
1647         }
1648 #ifndef OPENSSL_NO_TLSEXT
1649 int ssl3_get_new_session_ticket(SSL *s)
1650         {
1651         int ok,al,ret=0, ticklen;
1652         long n;
1653         const unsigned char *p;
1654         unsigned char *d;
1655
1656         n=s->method->ssl_get_message(s,
1657                 SSL3_ST_CR_SESSION_TICKET_A,
1658                 SSL3_ST_CR_SESSION_TICKET_B,
1659                 -1,
1660                 16384,
1661                 &ok);
1662
1663         if (!ok)
1664                 return((int)n);
1665
1666         if (s->s3->tmp.message_type == SSL3_MT_FINISHED)
1667                 {
1668                 s->s3->tmp.reuse_message=1;
1669                 return(1);
1670                 }
1671         if (s->s3->tmp.message_type != SSL3_MT_NEWSESSION_TICKET)
1672                 {
1673                 al=SSL_AD_UNEXPECTED_MESSAGE;
1674                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_BAD_MESSAGE_TYPE);
1675                 goto f_err;
1676                 }
1677         if (n < 6)
1678                 {
1679                 /* need at least ticket_lifetime_hint + ticket length */
1680                 al = SSL3_AL_FATAL,SSL_AD_DECODE_ERROR;
1681                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
1682                 goto f_err;
1683                 }
1684         p=d=(unsigned char *)s->init_msg;
1685         n2l(p, s->session->tlsext_tick_lifetime_hint);
1686         n2s(p, ticklen);
1687         /* ticket_lifetime_hint + ticket_length + ticket */
1688         if (ticklen + 6 != n)
1689                 {
1690                 al = SSL3_AL_FATAL,SSL_AD_DECODE_ERROR;
1691                 SSLerr(SSL_F_SSL3_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
1692                 goto f_err;
1693                 }
1694         if (s->session->tlsext_tick)
1695                 {
1696                 OPENSSL_free(s->session->tlsext_tick);
1697                 s->session->tlsext_ticklen = 0;
1698                 }
1699         s->session->tlsext_tick = OPENSSL_malloc(ticklen);
1700         if (!s->session->tlsext_tick)
1701                 {
1702                 SSLerr(SSL_F_SSL3_NEW_SESSION_TICKET,ERR_R_MALLOC_FAILURE);
1703                 goto err;
1704                 }
1705         memcpy(s->session->tlsext_tick, p, ticklen);
1706         s->session->tlsext_ticklen = ticklen;
1707
1708         ret=1;
1709         return(ret);
1710 f_err:
1711         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1712 err:
1713         return(-1);
1714         }
1715 #endif
1716
1717 int ssl3_get_server_done(SSL *s)
1718         {
1719         int ok,ret=0;
1720         long n;
1721
1722         n=s->method->ssl_get_message(s,
1723                 SSL3_ST_CR_SRVR_DONE_A,
1724                 SSL3_ST_CR_SRVR_DONE_B,
1725                 SSL3_MT_SERVER_DONE,
1726                 30, /* should be very small, like 0 :-) */
1727                 &ok);
1728
1729         if (!ok) return((int)n);
1730         if (n > 0)
1731                 {
1732                 /* should contain no data */
1733                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1734                 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
1735                 return -1;
1736                 }
1737         ret=1;
1738         return(ret);
1739         }
1740
1741
1742 int ssl3_send_client_key_exchange(SSL *s)
1743         {
1744         unsigned char *p,*d;
1745         int n;
1746         unsigned long l;
1747 #ifndef OPENSSL_NO_RSA
1748         unsigned char *q;
1749         EVP_PKEY *pkey=NULL;
1750 #endif
1751 #ifndef OPENSSL_NO_KRB5
1752         KSSL_ERR kssl_err;
1753 #endif /* OPENSSL_NO_KRB5 */
1754 #ifndef OPENSSL_NO_ECDH
1755         EC_KEY *clnt_ecdh = NULL;
1756         const EC_POINT *srvr_ecpoint = NULL;
1757         EVP_PKEY *srvr_pub_pkey = NULL;
1758         unsigned char *encodedPoint = NULL;
1759         int encoded_pt_len = 0;
1760         BN_CTX * bn_ctx = NULL;
1761 #endif
1762
1763         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
1764                 {
1765                 d=(unsigned char *)s->init_buf->data;
1766                 p= &(d[4]);
1767
1768                 l=s->s3->tmp.new_cipher->algorithms;
1769
1770                 /* Fool emacs indentation */
1771                 if (0) {}
1772 #ifndef OPENSSL_NO_RSA
1773                 else if (l & SSL_kRSA)
1774                         {
1775                         RSA *rsa;
1776                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1777
1778                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
1779                                 rsa=s->session->sess_cert->peer_rsa_tmp;
1780                         else
1781                                 {
1782                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1783                                 if ((pkey == NULL) ||
1784                                         (pkey->type != EVP_PKEY_RSA) ||
1785                                         (pkey->pkey.rsa == NULL))
1786                                         {
1787                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1788                                         goto err;
1789                                         }
1790                                 rsa=pkey->pkey.rsa;
1791                                 EVP_PKEY_free(pkey);
1792                                 }
1793
1794                         tmp_buf[0]=s->client_version>>8;
1795                         tmp_buf[1]=s->client_version&0xff;
1796                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
1797                                         goto err;
1798
1799                         s->session->master_key_length=sizeof tmp_buf;
1800
1801                         q=p;
1802                         /* Fix buf for TLS and beyond */
1803                         if (s->version > SSL3_VERSION)
1804                                 p+=2;
1805                         n=RSA_public_encrypt(sizeof tmp_buf,
1806                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
1807 #ifdef PKCS1_CHECK
1808                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
1809                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
1810 #endif
1811                         if (n <= 0)
1812                                 {
1813                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
1814                                 goto err;
1815                                 }
1816
1817                         /* Fix buf for TLS and beyond */
1818                         if (s->version > SSL3_VERSION)
1819                                 {
1820                                 s2n(n,q);
1821                                 n+=2;
1822                                 }
1823
1824                         s->session->master_key_length=
1825                                 s->method->ssl3_enc->generate_master_secret(s,
1826                                         s->session->master_key,
1827                                         tmp_buf,sizeof tmp_buf);
1828                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
1829                         }
1830 #endif
1831 #ifndef OPENSSL_NO_KRB5
1832                 else if (l & SSL_kKRB5)
1833                         {
1834                         krb5_error_code krb5rc;
1835                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
1836                         /*  krb5_data   krb5_ap_req;  */
1837                         krb5_data       *enc_ticket;
1838                         krb5_data       authenticator, *authp = NULL;
1839                         EVP_CIPHER_CTX  ciph_ctx;
1840                         EVP_CIPHER      *enc = NULL;
1841                         unsigned char   iv[EVP_MAX_IV_LENGTH];
1842                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1843                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH
1844                                                 + EVP_MAX_IV_LENGTH];
1845                         int             padl, outl = sizeof(epms);
1846
1847                         EVP_CIPHER_CTX_init(&ciph_ctx);
1848
1849 #ifdef KSSL_DEBUG
1850                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
1851                                 l, SSL_kKRB5);
1852 #endif  /* KSSL_DEBUG */
1853
1854                         authp = NULL;
1855 #ifdef KRB5SENDAUTH
1856                         if (KRB5SENDAUTH)  authp = &authenticator;
1857 #endif  /* KRB5SENDAUTH */
1858
1859                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
1860                                 &kssl_err);
1861                         enc = kssl_map_enc(kssl_ctx->enctype);
1862                         if (enc == NULL)
1863                             goto err;
1864 #ifdef KSSL_DEBUG
1865                         {
1866                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
1867                         if (krb5rc && kssl_err.text)
1868                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
1869                         }
1870 #endif  /* KSSL_DEBUG */
1871
1872                         if (krb5rc)
1873                                 {
1874                                 ssl3_send_alert(s,SSL3_AL_FATAL,
1875                                                 SSL_AD_HANDSHAKE_FAILURE);
1876                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1877                                                 kssl_err.reason);
1878                                 goto err;
1879                                 }
1880
1881                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
1882                         **  in place of RFC 2712 KerberosWrapper, as in:
1883                         **
1884                         **  Send ticket (copy to *p, set n = length)
1885                         **  n = krb5_ap_req.length;
1886                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
1887                         **  if (krb5_ap_req.data)
1888                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
1889                         **
1890                         **  Now using real RFC 2712 KerberosWrapper
1891                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
1892                         **  Note: 2712 "opaque" types are here replaced
1893                         **  with a 2-byte length followed by the value.
1894                         **  Example:
1895                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
1896                         **  Where "xx xx" = length bytes.  Shown here with
1897                         **  optional authenticator omitted.
1898                         */
1899
1900                         /*  KerberosWrapper.Ticket              */
1901                         s2n(enc_ticket->length,p);
1902                         memcpy(p, enc_ticket->data, enc_ticket->length);
1903                         p+= enc_ticket->length;
1904                         n = enc_ticket->length + 2;
1905
1906                         /*  KerberosWrapper.Authenticator       */
1907                         if (authp  &&  authp->length)
1908                                 {
1909                                 s2n(authp->length,p);
1910                                 memcpy(p, authp->data, authp->length);
1911                                 p+= authp->length;
1912                                 n+= authp->length + 2;
1913
1914                                 free(authp->data);
1915                                 authp->data = NULL;
1916                                 authp->length = 0;
1917                                 }
1918                         else
1919                                 {
1920                                 s2n(0,p);/*  null authenticator length  */
1921                                 n+=2;
1922                                 }
1923
1924                             tmp_buf[0]=s->client_version>>8;
1925                             tmp_buf[1]=s->client_version&0xff;
1926                             if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
1927                                 goto err;
1928
1929                         /*  20010420 VRS.  Tried it this way; failed.
1930                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
1931                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
1932                         **                              kssl_ctx->length);
1933                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
1934                         */
1935
1936                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
1937                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
1938                                 kssl_ctx->key,iv);
1939                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
1940                                 sizeof tmp_buf);
1941                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
1942                         outl += padl;
1943                         if (outl > sizeof epms)
1944                                 {
1945                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1946                                 goto err;
1947                                 }
1948                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
1949
1950                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
1951                         s2n(outl,p);
1952                         memcpy(p, epms, outl);
1953                         p+=outl;
1954                         n+=outl + 2;
1955
1956                         s->session->master_key_length=
1957                                 s->method->ssl3_enc->generate_master_secret(s,
1958                                         s->session->master_key,
1959                                         tmp_buf, sizeof tmp_buf);
1960
1961                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
1962                         OPENSSL_cleanse(epms, outl);
1963                         }
1964 #endif
1965 #ifndef OPENSSL_NO_DH
1966                 else if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1967                         {
1968                         DH *dh_srvr,*dh_clnt;
1969
1970                         if (s->session->sess_cert->peer_dh_tmp != NULL)
1971                                 dh_srvr=s->session->sess_cert->peer_dh_tmp;
1972                         else
1973                                 {
1974                                 /* we get them from the cert */
1975                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1976                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
1977                                 goto err;
1978                                 }
1979
1980                         /* generate a new random key */
1981                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
1982                                 {
1983                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1984                                 goto err;
1985                                 }
1986                         if (!DH_generate_key(dh_clnt))
1987                                 {
1988                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1989                                 goto err;
1990                                 }
1991
1992                         /* use the 'p' output buffer for the DH key, but
1993                          * make sure to clear it out afterwards */
1994
1995                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
1996
1997                         if (n <= 0)
1998                                 {
1999                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2000                                 goto err;
2001                                 }
2002
2003                         /* generate master key from the result */
2004                         s->session->master_key_length=
2005                                 s->method->ssl3_enc->generate_master_secret(s,
2006                                         s->session->master_key,p,n);
2007                         /* clean up */
2008                         memset(p,0,n);
2009
2010                         /* send off the data */
2011                         n=BN_num_bytes(dh_clnt->pub_key);
2012                         s2n(n,p);
2013                         BN_bn2bin(dh_clnt->pub_key,p);
2014                         n+=2;
2015
2016                         DH_free(dh_clnt);
2017
2018                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
2019                         }
2020 #endif
2021
2022 #ifndef OPENSSL_NO_ECDH
2023                 else if ((l & SSL_kECDH) || (l & SSL_kECDHE))
2024                         {
2025                         const EC_GROUP *srvr_group = NULL;
2026                         EC_KEY *tkey;
2027                         int ecdh_clnt_cert = 0;
2028                         int field_size = 0;
2029
2030                         /* Did we send out the client's
2031                          * ECDH share for use in premaster
2032                          * computation as part of client certificate?
2033                          * If so, set ecdh_clnt_cert to 1.
2034                          */
2035                         if ((l & SSL_kECDH) && (s->cert != NULL))
2036                                 {
2037                                 /* XXX: For now, we do not support client
2038                                  * authentication using ECDH certificates.
2039                                  * To add such support, one needs to add
2040                                  * code that checks for appropriate
2041                                  * conditions and sets ecdh_clnt_cert to 1.
2042                                  * For example, the cert have an ECC
2043                                  * key on the same curve as the server's
2044                                  * and the key should be authorized for
2045                                  * key agreement.
2046                                  *
2047                                  * One also needs to add code in ssl3_connect
2048                                  * to skip sending the certificate verify
2049                                  * message.
2050                                  *
2051                                  * if ((s->cert->key->privatekey != NULL) &&
2052                                  *     (s->cert->key->privatekey->type ==
2053                                  *      EVP_PKEY_EC) && ...)
2054                                  * ecdh_clnt_cert = 1;
2055                                  */
2056                                 }
2057
2058                         if (s->session->sess_cert->peer_ecdh_tmp != NULL)
2059                                 {
2060                                 tkey = s->session->sess_cert->peer_ecdh_tmp;
2061                                 }
2062                         else
2063                                 {
2064                                 /* Get the Server Public Key from Cert */
2065                                 srvr_pub_pkey = X509_get_pubkey(s->session-> \
2066                                     sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
2067                                 if ((srvr_pub_pkey == NULL) ||
2068                                     (srvr_pub_pkey->type != EVP_PKEY_EC) ||
2069                                     (srvr_pub_pkey->pkey.ec == NULL))
2070                                         {
2071                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2072                                             ERR_R_INTERNAL_ERROR);
2073                                         goto err;
2074                                         }
2075
2076                                 tkey = srvr_pub_pkey->pkey.ec;
2077                                 }
2078
2079                         srvr_group   = EC_KEY_get0_group(tkey);
2080                         srvr_ecpoint = EC_KEY_get0_public_key(tkey);
2081
2082                         if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
2083                                 {
2084                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2085                                     ERR_R_INTERNAL_ERROR);
2086                                 goto err;
2087                                 }
2088
2089                         if ((clnt_ecdh=EC_KEY_new()) == NULL)
2090                                 {
2091                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2092                                 goto err;
2093                                 }
2094
2095                         if (!EC_KEY_set_group(clnt_ecdh, srvr_group))
2096                                 {
2097                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2098                                 goto err;
2099                                 }
2100                         if (ecdh_clnt_cert)
2101                                 {
2102                                 /* Reuse key info from our certificate
2103                                  * We only need our private key to perform
2104                                  * the ECDH computation.
2105                                  */
2106                                 const BIGNUM *priv_key;
2107                                 tkey = s->cert->key->privatekey->pkey.ec;
2108                                 priv_key = EC_KEY_get0_private_key(tkey);
2109                                 if (priv_key == NULL)
2110                                         {
2111                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2112                                         goto err;
2113                                         }
2114                                 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key))
2115                                         {
2116                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2117                                         goto err;
2118                                         }
2119                                 }
2120                         else
2121                                 {
2122                                 /* Generate a new ECDH key pair */
2123                                 if (!(EC_KEY_generate_key(clnt_ecdh)))
2124                                         {
2125                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2126                                         goto err;
2127                                         }
2128                                 }
2129
2130                         /* use the 'p' output buffer for the ECDH key, but
2131                          * make sure to clear it out afterwards
2132                          */
2133
2134                         field_size = EC_GROUP_get_degree(srvr_group);
2135                         if (field_size <= 0)
2136                                 {
2137                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2138                                        ERR_R_ECDH_LIB);
2139                                 goto err;
2140                                 }
2141                         n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
2142                         if (n <= 0)
2143                                 {
2144                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2145                                        ERR_R_ECDH_LIB);
2146                                 goto err;
2147                                 }
2148
2149                         /* generate master key from the result */
2150                         s->session->master_key_length = s->method->ssl3_enc \
2151                             -> generate_master_secret(s,
2152                                 s->session->master_key,
2153                                 p, n);
2154
2155                         memset(p, 0, n); /* clean up */
2156
2157                         if (ecdh_clnt_cert)
2158                                 {
2159                                 /* Send empty client key exch message */
2160                                 n = 0;
2161                                 }
2162                         else
2163                                 {
2164                                 /* First check the size of encoding and
2165                                  * allocate memory accordingly.
2166                                  */
2167                                 encoded_pt_len =
2168                                     EC_POINT_point2oct(srvr_group,
2169                                         EC_KEY_get0_public_key(clnt_ecdh),
2170                                         POINT_CONVERSION_UNCOMPRESSED,
2171                                         NULL, 0, NULL);
2172
2173                                 encodedPoint = (unsigned char *)
2174                                     OPENSSL_malloc(encoded_pt_len *
2175                                         sizeof(unsigned char));
2176                                 bn_ctx = BN_CTX_new();
2177                                 if ((encodedPoint == NULL) ||
2178                                     (bn_ctx == NULL))
2179                                         {
2180                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2181                                         goto err;
2182                                         }
2183
2184                                 /* Encode the public key */
2185                                 n = EC_POINT_point2oct(srvr_group,
2186                                     EC_KEY_get0_public_key(clnt_ecdh),
2187                                     POINT_CONVERSION_UNCOMPRESSED,
2188                                     encodedPoint, encoded_pt_len, bn_ctx);
2189
2190                                 *p = n; /* length of encoded point */
2191                                 /* Encoded point will be copied here */
2192                                 p += 1;
2193                                 /* copy the point */
2194                                 memcpy((unsigned char *)p, encodedPoint, n);
2195                                 /* increment n to account for length field */
2196                                 n += 1;
2197                                 }
2198
2199                         /* Free allocated memory */
2200                         BN_CTX_free(bn_ctx);
2201                         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2202                         if (clnt_ecdh != NULL)
2203                                  EC_KEY_free(clnt_ecdh);
2204                         EVP_PKEY_free(srvr_pub_pkey);
2205                         }
2206 #endif /* !OPENSSL_NO_ECDH */
2207                 else
2208                         {
2209                         ssl3_send_alert(s, SSL3_AL_FATAL,
2210                             SSL_AD_HANDSHAKE_FAILURE);
2211                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2212                             ERR_R_INTERNAL_ERROR);
2213                         goto err;
2214                         }
2215
2216                 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
2217                 l2n3(n,d);
2218
2219                 s->state=SSL3_ST_CW_KEY_EXCH_B;
2220                 /* number of bytes to write */
2221                 s->init_num=n+4;
2222                 s->init_off=0;
2223                 }
2224
2225         /* SSL3_ST_CW_KEY_EXCH_B */
2226         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2227 err:
2228 #ifndef OPENSSL_NO_ECDH
2229         BN_CTX_free(bn_ctx);
2230         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2231         if (clnt_ecdh != NULL)
2232                 EC_KEY_free(clnt_ecdh);
2233         EVP_PKEY_free(srvr_pub_pkey);
2234 #endif
2235         return(-1);
2236         }
2237
2238 int ssl3_send_client_verify(SSL *s)
2239         {
2240         unsigned char *p,*d;
2241         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
2242         EVP_PKEY *pkey;
2243 #ifndef OPENSSL_NO_RSA
2244         unsigned u=0;
2245 #endif
2246         unsigned long n;
2247 #if !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_ECDSA)
2248         int j;
2249 #endif
2250
2251         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
2252                 {
2253                 d=(unsigned char *)s->init_buf->data;
2254                 p= &(d[4]);
2255                 pkey=s->cert->key->privatekey;
2256
2257                 s->method->ssl3_enc->cert_verify_mac(s,&(s->s3->finish_dgst2),
2258                         &(data[MD5_DIGEST_LENGTH]));
2259
2260 #ifndef OPENSSL_NO_RSA
2261                 if (pkey->type == EVP_PKEY_RSA)
2262                         {
2263                         s->method->ssl3_enc->cert_verify_mac(s,
2264                                 &(s->s3->finish_dgst1),&(data[0]));
2265                         if (RSA_sign(NID_md5_sha1, data,
2266                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
2267                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
2268                                 {
2269                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
2270                                 goto err;
2271                                 }
2272                         s2n(u,p);
2273                         n=u+2;
2274                         }
2275                 else
2276 #endif
2277 #ifndef OPENSSL_NO_DSA
2278                         if (pkey->type == EVP_PKEY_DSA)
2279                         {
2280                         if (!DSA_sign(pkey->save_type,
2281                                 &(data[MD5_DIGEST_LENGTH]),
2282                                 SHA_DIGEST_LENGTH,&(p[2]),
2283                                 (unsigned int *)&j,pkey->pkey.dsa))
2284                                 {
2285                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
2286                                 goto err;
2287                                 }
2288                         s2n(j,p);
2289                         n=j+2;
2290                         }
2291                 else
2292 #endif
2293 #ifndef OPENSSL_NO_ECDSA
2294                         if (pkey->type == EVP_PKEY_EC)
2295                         {
2296                         if (!ECDSA_sign(pkey->save_type,
2297                                 &(data[MD5_DIGEST_LENGTH]),
2298                                 SHA_DIGEST_LENGTH,&(p[2]),
2299                                 (unsigned int *)&j,pkey->pkey.ec))
2300                                 {
2301                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
2302                                     ERR_R_ECDSA_LIB);
2303                                 goto err;
2304                                 }
2305                         s2n(j,p);
2306                         n=j+2;
2307                         }
2308                 else
2309 #endif
2310                         {
2311                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
2312                         goto err;
2313                         }
2314                 *(d++)=SSL3_MT_CERTIFICATE_VERIFY;
2315                 l2n3(n,d);
2316
2317                 s->state=SSL3_ST_CW_CERT_VRFY_B;
2318                 s->init_num=(int)n+4;
2319                 s->init_off=0;
2320                 }
2321         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2322 err:
2323         return(-1);
2324         }
2325
2326 int ssl3_send_client_certificate(SSL *s)
2327         {
2328         X509 *x509=NULL;
2329         EVP_PKEY *pkey=NULL;
2330         int i;
2331         unsigned long l;
2332
2333         if (s->state == SSL3_ST_CW_CERT_A)
2334                 {
2335                 if ((s->cert == NULL) ||
2336                         (s->cert->key->x509 == NULL) ||
2337                         (s->cert->key->privatekey == NULL))
2338                         s->state=SSL3_ST_CW_CERT_B;
2339                 else
2340                         s->state=SSL3_ST_CW_CERT_C;
2341                 }
2342
2343         /* We need to get a client cert */
2344         if (s->state == SSL3_ST_CW_CERT_B)
2345                 {
2346                 /* If we get an error, we need to
2347                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
2348                  * We then get retied later */
2349                 i=0;
2350                 if (s->ctx->client_cert_cb != NULL)
2351                         i=s->ctx->client_cert_cb(s,&(x509),&(pkey));
2352                 if (i < 0)
2353                         {
2354                         s->rwstate=SSL_X509_LOOKUP;
2355                         return(-1);
2356                         }
2357                 s->rwstate=SSL_NOTHING;
2358                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
2359                         {
2360                         s->state=SSL3_ST_CW_CERT_B;
2361                         if (    !SSL_use_certificate(s,x509) ||
2362                                 !SSL_use_PrivateKey(s,pkey))
2363                                 i=0;
2364                         }
2365                 else if (i == 1)
2366                         {
2367                         i=0;
2368                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
2369                         }
2370
2371                 if (x509 != NULL) X509_free(x509);
2372                 if (pkey != NULL) EVP_PKEY_free(pkey);
2373                 if (i == 0)
2374                         {
2375                         if (s->version == SSL3_VERSION)
2376                                 {
2377                                 s->s3->tmp.cert_req=0;
2378                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
2379                                 return(1);
2380                                 }
2381                         else
2382                                 {
2383                                 s->s3->tmp.cert_req=2;
2384                                 }
2385                         }
2386
2387                 /* Ok, we have a cert */
2388                 s->state=SSL3_ST_CW_CERT_C;
2389                 }
2390
2391         if (s->state == SSL3_ST_CW_CERT_C)
2392                 {
2393                 s->state=SSL3_ST_CW_CERT_D;
2394                 l=ssl3_output_cert_chain(s,
2395                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
2396                 s->init_num=(int)l;
2397                 s->init_off=0;
2398                 }
2399         /* SSL3_ST_CW_CERT_D */
2400         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2401         }
2402
2403 #define has_bits(i,m)   (((i)&(m)) == (m))
2404
2405 int ssl3_check_cert_and_algorithm(SSL *s)
2406         {
2407         int i,idx;
2408         long algs;
2409         EVP_PKEY *pkey=NULL;
2410         SESS_CERT *sc;
2411 #ifndef OPENSSL_NO_RSA
2412         RSA *rsa;
2413 #endif
2414 #ifndef OPENSSL_NO_DH
2415         DH *dh;
2416 #endif
2417
2418         sc=s->session->sess_cert;
2419
2420         algs=s->s3->tmp.new_cipher->algorithms;
2421
2422         /* we don't have a certificate */
2423         if (algs & (SSL_aDH|SSL_aNULL|SSL_aKRB5))
2424                 return(1);
2425
2426         if (sc == NULL)
2427                 {
2428                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,ERR_R_INTERNAL_ERROR);
2429                 goto err;
2430                 }
2431
2432 #ifndef OPENSSL_NO_RSA
2433         rsa=s->session->sess_cert->peer_rsa_tmp;
2434 #endif
2435 #ifndef OPENSSL_NO_DH
2436         dh=s->session->sess_cert->peer_dh_tmp;
2437 #endif
2438
2439         /* This is the passed certificate */
2440
2441         idx=sc->peer_cert_type;
2442 #ifndef OPENSSL_NO_ECDH
2443         if (idx == SSL_PKEY_ECC)
2444                 {
2445                 if (check_srvr_ecc_cert_and_alg(sc->peer_pkeys[idx].x509,
2446                     s->s3->tmp.new_cipher) == 0)
2447                         { /* check failed */
2448                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_BAD_ECC_CERT);
2449                         goto f_err;
2450                         }
2451                 else
2452                         {
2453                         return 1;
2454                         }
2455                 }
2456 #endif
2457         pkey=X509_get_pubkey(sc->peer_pkeys[idx].x509);
2458         i=X509_certificate_type(sc->peer_pkeys[idx].x509,pkey);
2459         EVP_PKEY_free(pkey);
2460
2461
2462         /* Check that we have a certificate if we require one */
2463         if ((algs & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
2464                 {
2465                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
2466                 goto f_err;
2467                 }
2468 #ifndef OPENSSL_NO_DSA
2469         else if ((algs & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
2470                 {
2471                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
2472                 goto f_err;
2473                 }
2474 #endif
2475 #ifndef OPENSSL_NO_RSA
2476         if ((algs & SSL_kRSA) &&
2477                 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
2478                 {
2479                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
2480                 goto f_err;
2481                 }
2482 #endif
2483 #ifndef OPENSSL_NO_DH
2484         if ((algs & SSL_kEDH) &&
2485                 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
2486                 {
2487                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
2488                 goto f_err;
2489                 }
2490         else if ((algs & SSL_kDHr) && !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
2491                 {
2492                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
2493                 goto f_err;
2494                 }
2495 #ifndef OPENSSL_NO_DSA
2496         else if ((algs & SSL_kDHd) && !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
2497                 {
2498                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
2499                 goto f_err;
2500                 }
2501 #endif
2502 #endif
2503
2504         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i,EVP_PKT_EXP))
2505                 {
2506 #ifndef OPENSSL_NO_RSA
2507                 if (algs & SSL_kRSA)
2508                         {
2509                         if (rsa == NULL
2510                             || RSA_size(rsa)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
2511                                 {
2512                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
2513                                 goto f_err;
2514                                 }
2515                         }
2516                 else
2517 #endif
2518 #ifndef OPENSSL_NO_DH
2519                         if (algs & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2520                             {
2521                             if (dh == NULL
2522                                 || DH_size(dh)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
2523                                 {
2524                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
2525                                 goto f_err;
2526                                 }
2527                         }
2528                 else
2529 #endif
2530                         {
2531                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
2532                         goto f_err;
2533                         }
2534                 }
2535         return(1);
2536 f_err:
2537         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
2538 err:
2539         return(0);
2540         }
2541
2542
2543 #ifndef OPENSSL_NO_ECDH
2544 /* This is the complement of nid2curve_id in s3_srvr.c. */
2545 static int curve_id2nid(int curve_id)
2546 {
2547         /* ECC curves from draft-ietf-tls-ecc-01.txt (Mar 15, 2001)
2548          * (no changes in draft-ietf-tls-ecc-03.txt [June 2003]) */
2549         static int nid_list[26] =
2550         {
2551                 0,
2552                 NID_sect163k1, /* sect163k1 (1) */
2553                 NID_sect163r1, /* sect163r1 (2) */
2554                 NID_sect163r2, /* sect163r2 (3) */
2555                 NID_sect193r1, /* sect193r1 (4) */
2556                 NID_sect193r2, /* sect193r2 (5) */
2557                 NID_sect233k1, /* sect233k1 (6) */
2558                 NID_sect233r1, /* sect233r1 (7) */
2559                 NID_sect239k1, /* sect239k1 (8) */
2560                 NID_sect283k1, /* sect283k1 (9) */
2561                 NID_sect283r1, /* sect283r1 (10) */
2562                 NID_sect409k1, /* sect409k1 (11) */
2563                 NID_sect409r1, /* sect409r1 (12) */
2564                 NID_sect571k1, /* sect571k1 (13) */
2565                 NID_sect571r1, /* sect571r1 (14) */
2566                 NID_secp160k1, /* secp160k1 (15) */
2567                 NID_secp160r1, /* secp160r1 (16) */
2568                 NID_secp160r2, /* secp160r2 (17) */
2569                 NID_secp192k1, /* secp192k1 (18) */
2570                 NID_X9_62_prime192v1, /* secp192r1 (19) */
2571                 NID_secp224k1, /* secp224k1 (20) */
2572                 NID_secp224r1, /* secp224r1 (21) */
2573                 NID_secp256k1, /* secp256k1 (22) */
2574                 NID_X9_62_prime256v1, /* secp256r1 (23) */
2575                 NID_secp384r1, /* secp384r1 (24) */
2576                 NID_secp521r1  /* secp521r1 (25) */
2577         };
2578
2579         if ((curve_id < 1) || (curve_id > 25)) return 0;
2580
2581         return nid_list[curve_id];
2582 }
2583 #endif
2584
2585 /* Check to see if handshake is full or resumed. Usually this is just a
2586  * case of checking to see if a cache hit has occurred. In the case of
2587  * session tickets we have to check the next message to be sure.
2588  */
2589
2590 #ifndef OPENSSL_NO_TLSEXT
2591 static int ssl3_check_finished(SSL *s)
2592         {
2593         int ok;
2594         long n;
2595         if (!s->session->tlsext_tick)
2596                 return 1;
2597         /* this function is called when we really expect a Certificate
2598          * message, so permit appropriate message length */
2599         n=s->method->ssl_get_message(s,
2600                 SSL3_ST_CR_CERT_A,
2601                 SSL3_ST_CR_CERT_B,
2602                 -1,
2603                 s->max_cert_list,
2604                 &ok);
2605         if (!ok) return((int)n);
2606         s->s3->tmp.reuse_message = 1;
2607         if ((s->s3->tmp.message_type == SSL3_MT_FINISHED)
2608                 || (s->s3->tmp.message_type == SSL3_MT_NEWSESSION_TICKET))
2609                 return 2;
2610
2611         return 1;
2612         }
2613 #endif