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) 1998-2002 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 #include "cryptlib.h"
 134
 135 static SSL_METHOD *ssl3_get_client_method(int ver);
 136 static int ssl3_client_hello(SSL *s);
 137 static int ssl3_get_server_hello(SSL *s);
 138 static int ssl3_get_certificate_request(SSL *s);
 139 static int ca_dn_cmp(const X509_NAME * const *a,const X509_NAME * const *b);
 140 static int ssl3_get_server_done(SSL *s);
 141 static int ssl3_send_client_verify(SSL *s);
 142 static int ssl3_send_client_certificate(SSL *s);
 143 static int ssl3_send_client_key_exchange(SSL *s);
 144 static int ssl3_get_key_exchange(SSL *s);
 145 static int ssl3_get_server_certificate(SSL *s);
 146 static int ssl3_check_cert_and_algorithm(SSL *s);
 147
 148 #ifndef OPENSSL_NO_ECDH
 149 static int curve_id2nid(int curve_id);
 150 int check_srvr_ecc_cert_and_alg(X509 *x, SSL_CIPHER *cs);
 151 #endif
 152
 153 static SSL_METHOD *ssl3_get_client_method(int ver)
 154         {
 155         if (ver == SSL3_VERSION)
 156                 return(SSLv3_client_method());
 157         else
 158                 return(NULL);
 159         }
 160
 161 SSL_METHOD *SSLv3_client_method(void)
 162         {
 163         static int init=1;
 164         static SSL_METHOD SSLv3_client_data;
 165
 166         if (init)
 167                 {
 168                 CRYPTO_w_lock(CRYPTO_LOCK_SSL_METHOD);
 169
 170                 if (init)
 171                         {
 172                         memcpy((char *)&SSLv3_client_data,(char *)sslv3_base_method(),
 173                                 sizeof(SSL_METHOD));
 174                         SSLv3_client_data.ssl_connect=ssl3_connect;
 175                         SSLv3_client_data.get_ssl_method=ssl3_get_client_method;
 176                         init=0;
 177                         }
 178
 179                 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_METHOD);
 180                 }
 181         return(&SSLv3_client_data);
 182         }
 183
 184 int ssl3_connect(SSL *s)
 185         {
 186         BUF_MEM *buf;
 187         unsigned long Time=time(NULL),l;
 188         long num1;
 189         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 190         int ret= -1;
 191         int new_state,state,skip=0;;
 192
 193         RAND_add(&Time,sizeof(Time),0);
 194         ERR_clear_error();
 195         clear_sys_error();
 196
 197         if (s->info_callback != NULL)
 198                 cb=s->info_callback;
 199         else if (s->ctx->info_callback != NULL)
 200                 cb=s->ctx->info_callback;
 201
 202         s->in_handshake++;
 203         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 204
 205         for (;;)
 206                 {
 207                 state=s->state;
 208
 209                 switch(s->state)
 210                         {
 211                 case SSL_ST_RENEGOTIATE:
 212                         s->new_session=1;
 213                         s->state=SSL_ST_CONNECT;
 214                         s->ctx->stats.sess_connect_renegotiate++;
 215                         /* break */
 216                 case SSL_ST_BEFORE:
 217                 case SSL_ST_CONNECT:
 218                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 219                 case SSL_ST_OK|SSL_ST_CONNECT:
 220
 221                         s->server=0;
 222                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 223
 224                         if ((s->version & 0xff00 ) != 0x0300)
 225                                 {
 226                                 SSLerr(SSL_F_SSL3_CONNECT, ERR_R_INTERNAL_ERROR);
 227                                 ret = -1;
 228                                 goto end;
 229                                 }
 230
 231                         /* s->version=SSL3_VERSION; */
 232                         s->type=SSL_ST_CONNECT;
 233
 234                         if (s->init_buf == NULL)
 235                                 {
 236                                 if ((buf=BUF_MEM_new()) == NULL)
 237                                         {
 238                                         ret= -1;
 239                                         goto end;
 240                                         }
 241                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 242                                         {
 243                                         ret= -1;
 244                                         goto end;
 245                                         }
 246                                 s->init_buf=buf;
 247                                 }
 248
 249                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
 250
 251                         /* setup buffing BIO */
 252                         if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
 253
 254                         /* don't push the buffering BIO quite yet */
 255
 256                         ssl3_init_finished_mac(s);
 257
 258                         s->state=SSL3_ST_CW_CLNT_HELLO_A;
 259                         s->ctx->stats.sess_connect++;
 260                         s->init_num=0;
 261                         break;
 262
 263                 case SSL3_ST_CW_CLNT_HELLO_A:
 264                 case SSL3_ST_CW_CLNT_HELLO_B:
 265
 266                         s->shutdown=0;
 267                         ret=ssl3_client_hello(s);
 268                         if (ret <= 0) goto end;
 269                         s->state=SSL3_ST_CR_SRVR_HELLO_A;
 270                         s->init_num=0;
 271
 272                         /* turn on buffering for the next lot of output */
 273                         if (s->bbio != s->wbio)
 274                                 s->wbio=BIO_push(s->bbio,s->wbio);
 275
 276                         break;
 277
 278                 case SSL3_ST_CR_SRVR_HELLO_A:
 279                 case SSL3_ST_CR_SRVR_HELLO_B:
 280                         ret=ssl3_get_server_hello(s);
 281                         if (ret <= 0) goto end;
 282                         if (s->hit)
 283                                 s->state=SSL3_ST_CR_FINISHED_A;
 284                         else
 285                                 s->state=SSL3_ST_CR_CERT_A;
 286                         s->init_num=0;
 287                         break;
 288
 289                 case SSL3_ST_CR_CERT_A:
 290                 case SSL3_ST_CR_CERT_B:
 291                         /* Check if it is anon DH/ECDH */
 292                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 293                                 {
 294                                 ret=ssl3_get_server_certificate(s);
 295                                 if (ret <= 0) goto end;
 296                                 }
 297                         else
 298                                 skip=1;
 299                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 300                         s->init_num=0;
 301                         break;
 302
 303                 case SSL3_ST_CR_KEY_EXCH_A:
 304                 case SSL3_ST_CR_KEY_EXCH_B:
 305                         ret=ssl3_get_key_exchange(s);
 306                         if (ret <= 0) goto end;
 307                         s->state=SSL3_ST_CR_CERT_REQ_A;
 308                         s->init_num=0;
 309
 310                         /* at this point we check that we have the
 311                          * required stuff from the server */
 312                         if (!ssl3_check_cert_and_algorithm(s))
 313                                 {
 314                                 ret= -1;
 315                                 goto end;
 316                                 }
 317                         break;
 318
 319                 case SSL3_ST_CR_CERT_REQ_A:
 320                 case SSL3_ST_CR_CERT_REQ_B:
 321                         ret=ssl3_get_certificate_request(s);
 322                         if (ret <= 0) goto end;
 323                         s->state=SSL3_ST_CR_SRVR_DONE_A;
 324                         s->init_num=0;
 325                         break;
 326
 327                 case SSL3_ST_CR_SRVR_DONE_A:
 328                 case SSL3_ST_CR_SRVR_DONE_B:
 329                         ret=ssl3_get_server_done(s);
 330                         if (ret <= 0) goto end;
 331                         if (s->s3->tmp.cert_req)
 332                                 s->state=SSL3_ST_CW_CERT_A;
 333                         else
 334                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
 335                         s->init_num=0;
 336
 337                         break;
 338
 339                 case SSL3_ST_CW_CERT_A:
 340                 case SSL3_ST_CW_CERT_B:
 341                 case SSL3_ST_CW_CERT_C:
 342                 case SSL3_ST_CW_CERT_D:
 343                         ret=ssl3_send_client_certificate(s);
 344                         if (ret <= 0) goto end;
 345                         s->state=SSL3_ST_CW_KEY_EXCH_A;
 346                         s->init_num=0;
 347                         break;
 348
 349                 case SSL3_ST_CW_KEY_EXCH_A:
 350                 case SSL3_ST_CW_KEY_EXCH_B:
 351                         ret=ssl3_send_client_key_exchange(s);
 352                         if (ret <= 0) goto end;
 353                         l=s->s3->tmp.new_cipher->algorithms;
 354                         /* EAY EAY EAY need to check for DH fix cert
 355                          * sent back */
 356                         /* For TLS, cert_req is set to 2, so a cert chain
 357                          * of nothing is sent, but no verify packet is sent */
 358                         /* XXX: For now, we do not support client
 359                          * authentication in ECDH cipher suites with
 360                          * ECDH (rather than ECDSA) certificates.
 361                          * We need to skip the certificate verify
 362                          * message when client's ECDH public key is sent
 363                          * inside the client certificate.
 364                          */
 365                         if (s->s3->tmp.cert_req == 1)
 366                                 {
 367                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
 368                                 }
 369                         else
 370                                 {
 371                                 s->state=SSL3_ST_CW_CHANGE_A;
 372                                 s->s3->change_cipher_spec=0;
 373                                 }
 374
 375                         s->init_num=0;
 376                         break;
 377
 378                 case SSL3_ST_CW_CERT_VRFY_A:
 379                 case SSL3_ST_CW_CERT_VRFY_B:
 380                         ret=ssl3_send_client_verify(s);
 381                         if (ret <= 0) goto end;
 382                         s->state=SSL3_ST_CW_CHANGE_A;
 383                         s->init_num=0;
 384                         s->s3->change_cipher_spec=0;
 385                         break;
 386
 387                 case SSL3_ST_CW_CHANGE_A:
 388                 case SSL3_ST_CW_CHANGE_B:
 389                         ret=ssl3_send_change_cipher_spec(s,
 390                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
 391                         if (ret <= 0) goto end;
 392                         s->state=SSL3_ST_CW_FINISHED_A;
 393                         s->init_num=0;
 394
 395                         s->session->cipher=s->s3->tmp.new_cipher;
 396                         if (s->s3->tmp.new_compression == NULL)
 397                                 s->session->compress_meth=0;
 398                         else
 399                                 s->session->compress_meth=
 400                                         s->s3->tmp.new_compression->id;
 401                         if (!s->method->ssl3_enc->setup_key_block(s))
 402                                 {
 403                                 ret= -1;
 404                                 goto end;
 405                                 }
 406
 407                         if (!s->method->ssl3_enc->change_cipher_state(s,
 408                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 409                                 {
 410                                 ret= -1;
 411                                 goto end;
 412                                 }
 413
 414                         break;
 415
 416                 case SSL3_ST_CW_FINISHED_A:
 417                 case SSL3_ST_CW_FINISHED_B:
 418                         ret=ssl3_send_finished(s,
 419                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
 420                                 s->method->ssl3_enc->client_finished_label,
 421                                 s->method->ssl3_enc->client_finished_label_len);
 422                         if (ret <= 0) goto end;
 423                         s->state=SSL3_ST_CW_FLUSH;
 424
 425                         /* clear flags */
 426                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
 427                         if (s->hit)
 428                                 {
 429                                 s->s3->tmp.next_state=SSL_ST_OK;
 430                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
 431                                         {
 432                                         s->state=SSL_ST_OK;
 433                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
 434                                         s->s3->delay_buf_pop_ret=0;
 435                                         }
 436                                 }
 437                         else
 438                                 {
 439                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
 440                                 }
 441                         s->init_num=0;
 442                         break;
 443
 444                 case SSL3_ST_CR_FINISHED_A:
 445                 case SSL3_ST_CR_FINISHED_B:
 446
 447                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
 448                                 SSL3_ST_CR_FINISHED_B);
 449                         if (ret <= 0) goto end;
 450
 451                         if (s->hit)
 452                                 s->state=SSL3_ST_CW_CHANGE_A;
 453                         else
 454                                 s->state=SSL_ST_OK;
 455                         s->init_num=0;
 456                         break;
 457
 458                 case SSL3_ST_CW_FLUSH:
 459                         /* number of bytes to be flushed */
 460                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 461                         if (num1 > 0)
 462                                 {
 463                                 s->rwstate=SSL_WRITING;
 464                                 num1=BIO_flush(s->wbio);
 465                                 if (num1 <= 0) { ret= -1; goto end; }
 466                                 s->rwstate=SSL_NOTHING;
 467                                 }
 468
 469                         s->state=s->s3->tmp.next_state;
 470                         break;
 471
 472                 case SSL_ST_OK:
 473                         /* clean a few things up */
 474                         ssl3_cleanup_key_block(s);
 475
 476                         if (s->init_buf != NULL)
 477                                 {
 478                                 BUF_MEM_free(s->init_buf);
 479                                 s->init_buf=NULL;
 480                                 }
 481
 482                         /* If we are not 'joining' the last two packets,
 483                          * remove the buffering now */
 484                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 485                                 ssl_free_wbio_buffer(s);
 486                         /* else do it later in ssl3_write */
 487
 488                         s->init_num=0;
 489                         s->new_session=0;
 490
 491                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 492                         if (s->hit) s->ctx->stats.sess_hit++;
 493
 494                         ret=1;
 495                         /* s->server=0; */
 496                         s->handshake_func=ssl3_connect;
 497                         s->ctx->stats.sess_connect_good++;
 498
 499                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 500
 501                         goto end;
 502                         /* break; */
 503
 504                 default:
 505                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_UNKNOWN_STATE);
 506                         ret= -1;
 507                         goto end;
 508                         /* break; */
 509                         }
 510
 511                 /* did we do anything */
 512                 if (!s->s3->tmp.reuse_message && !skip)
 513                         {
 514                         if (s->debug)
 515                                 {
 516                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 517                                         goto end;
 518                                 }
 519
 520                         if ((cb != NULL) && (s->state != state))
 521                                 {
 522                                 new_state=s->state;
 523                                 s->state=state;
 524                                 cb(s,SSL_CB_CONNECT_LOOP,1);
 525                                 s->state=new_state;
 526                                 }
 527                         }
 528                 skip=0;
 529                 }
 530 end:
 531         s->in_handshake--;
 532         if (cb != NULL)
 533                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 534         return(ret);
 535         }
 536
 537
 538 static int ssl3_client_hello(SSL *s)
 539         {
 540         unsigned char *buf;
 541         unsigned char *p,*d;
 542         int i,j;
 543         unsigned long Time,l;
 544         SSL_COMP *comp;
 545
 546         buf=(unsigned char *)s->init_buf->data;
 547         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
 548                 {
 549                 if ((s->session == NULL) ||
 550                         (s->session->ssl_version != s->version) ||
 551                         (s->session->not_resumable))
 552                         {
 553                         if (!ssl_get_new_session(s,0))
 554                                 goto err;
 555                         }
 556                 /* else use the pre-loaded session */
 557
 558                 p=s->s3->client_random;
 559                 Time=time(NULL);                        /* Time */
 560                 l2n(Time,p);
 561                 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
 562
 563                 /* Do the message type and length last */
 564                 d=p= &(buf[4]);
 565
 566                 *(p++)=s->version>>8;
 567                 *(p++)=s->version&0xff;
 568                 s->client_version=s->version;
 569
 570                 /* Random stuff */
 571                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 572                 p+=SSL3_RANDOM_SIZE;
 573
 574                 /* Session ID */
 575                 if (s->new_session)
 576                         i=0;
 577                 else
 578                         i=s->session->session_id_length;
 579                 *(p++)=i;
 580                 if (i != 0)
 581                         {
 582                         if (i > sizeof s->session->session_id)
 583                                 {
 584                                 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 585                                 goto err;
 586                                 }
 587                         memcpy(p,s->session->session_id,i);
 588                         p+=i;
 589                         }
 590
 591                 /* Ciphers supported */
 592                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]));
 593                 if (i == 0)
 594                         {
 595                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 596                         goto err;
 597                         }
 598                 s2n(i,p);
 599                 p+=i;
 600
 601                 /* COMPRESSION */
 602                 if (s->ctx->comp_methods == NULL)
 603                         j=0;
 604                 else
 605                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
 606                 *(p++)=1+j;
 607                 for (i=0; i<j; i++)
 608                         {
 609                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
 610                         *(p++)=comp->id;
 611                         }
 612                 *(p++)=0; /* Add the NULL method */
 613
 614                 l=(p-d);
 615                 d=buf;
 616                 *(d++)=SSL3_MT_CLIENT_HELLO;
 617                 l2n3(l,d);
 618
 619                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 620                 /* number of bytes to write */
 621                 s->init_num=p-buf;
 622                 s->init_off=0;
 623                 }
 624
 625         /* SSL3_ST_CW_CLNT_HELLO_B */
 626         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 627 err:
 628         return(-1);
 629         }
 630
 631 static int ssl3_get_server_hello(SSL *s)
 632         {
 633         STACK_OF(SSL_CIPHER) *sk;
 634         SSL_CIPHER *c;
 635         unsigned char *p,*d;
 636         int i,al,ok;
 637         unsigned int j;
 638         long n;
 639         SSL_COMP *comp;
 640
 641         n=ssl3_get_message(s,
 642                 SSL3_ST_CR_SRVR_HELLO_A,
 643                 SSL3_ST_CR_SRVR_HELLO_B,
 644                 SSL3_MT_SERVER_HELLO,
 645                 300, /* ?? */
 646                 &ok);
 647
 648         if (!ok) return((int)n);
 649         d=p=(unsigned char *)s->init_msg;
 650
 651         if ((p[0] != (s->version>>8)) || (p[1] != (s->version&0xff)))
 652                 {
 653                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
 654                 s->version=(s->version&0xff00)|p[1];
 655                 al=SSL_AD_PROTOCOL_VERSION;
 656                 goto f_err;
 657                 }
 658         p+=2;
 659
 660         /* load the server hello data */
 661         /* load the server random */
 662         memcpy(s->s3->server_random,p,SSL3_RANDOM_SIZE);
 663         p+=SSL3_RANDOM_SIZE;
 664
 665         /* get the session-id */
 666         j= *(p++);
 667
 668         if ((j > sizeof s->session->session_id) || (j > SSL3_SESSION_ID_SIZE))
 669                 {
 670                 al=SSL_AD_ILLEGAL_PARAMETER;
 671                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_LONG);
 672                 goto f_err;
 673                 }
 674
 675         if (j != 0 && j == s->session->session_id_length
 676             && memcmp(p,s->session->session_id,j) == 0)
 677             {
 678             if(s->sid_ctx_length != s->session->sid_ctx_length
 679                || memcmp(s->session->sid_ctx,s->sid_ctx,s->sid_ctx_length))
 680                 {
 681                 /* actually a client application bug */
 682                 al=SSL_AD_ILLEGAL_PARAMETER;
 683                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
 684                 goto f_err;
 685                 }
 686             s->hit=1;
 687             }
 688         else    /* a miss or crap from the other end */
 689                 {
 690                 /* If we were trying for session-id reuse, make a new
 691                  * SSL_SESSION so we don't stuff up other people */
 692                 s->hit=0;
 693                 if (s->session->session_id_length > 0)
 694                         {
 695                         if (!ssl_get_new_session(s,0))
 696                                 {
 697                                 al=SSL_AD_INTERNAL_ERROR;
 698                                 goto f_err;
 699                                 }
 700                         }
 701                 s->session->session_id_length=j;
 702                 memcpy(s->session->session_id,p,j); /* j could be 0 */
 703                 }
 704         p+=j;
 705         c=ssl_get_cipher_by_char(s,p);
 706         if (c == NULL)
 707                 {
 708                 /* unknown cipher */
 709                 al=SSL_AD_ILLEGAL_PARAMETER;
 710                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNKNOWN_CIPHER_RETURNED);
 711                 goto f_err;
 712                 }
 713         p+=ssl_put_cipher_by_char(s,NULL,NULL);
 714
 715         sk=ssl_get_ciphers_by_id(s);
 716         i=sk_SSL_CIPHER_find(sk,c);
 717         if (i < 0)
 718                 {
 719                 /* we did not say we would use this cipher */
 720                 al=SSL_AD_ILLEGAL_PARAMETER;
 721                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
 722                 goto f_err;
 723                 }
 724
 725         if (s->hit && (s->session->cipher_id != c->id))
 726                 {
 727                 if (!(s->options &
 728                         SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
 729                         {
 730                         al=SSL_AD_ILLEGAL_PARAMETER;
 731                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
 732                         goto f_err;
 733                         }
 734                 }
 735         s->s3->tmp.new_cipher=c;
 736
 737         /* lets get the compression algorithm */
 738         /* COMPRESSION */
 739         j= *(p++);
 740         if (j == 0)
 741                 comp=NULL;
 742         else
 743                 comp=ssl3_comp_find(s->ctx->comp_methods,j);
 744
 745         if ((j != 0) && (comp == NULL))
 746                 {
 747                 al=SSL_AD_ILLEGAL_PARAMETER;
 748                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
 749                 goto f_err;
 750                 }
 751         else
 752                 {
 753                 s->s3->tmp.new_compression=comp;
 754                 }
 755
 756         if (p != (d+n))
 757                 {
 758                 /* wrong packet length */
 759                 al=SSL_AD_DECODE_ERROR;
 760                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
 761                 goto err;
 762                 }
 763
 764         return(1);
 765 f_err:
 766         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 767 err:
 768         return(-1);
 769         }
 770
 771 static int ssl3_get_server_certificate(SSL *s)
 772         {
 773         int al,i,ok,ret= -1;
 774         unsigned long n,nc,llen,l;
 775         X509 *x=NULL;
 776         unsigned char *p,*d,*q;
 777         STACK_OF(X509) *sk=NULL;
 778         SESS_CERT *sc;
 779         EVP_PKEY *pkey=NULL;
 780         int need_cert = 1; /* VRS: 0=> will allow null cert if auth == KRB5 */
 781
 782         n=ssl3_get_message(s,
 783                 SSL3_ST_CR_CERT_A,
 784                 SSL3_ST_CR_CERT_B,
 785                 -1,
 786                 s->max_cert_list,
 787                 &ok);
 788
 789         if (!ok) return((int)n);
 790
 791         if (s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE)
 792                 {
 793                 s->s3->tmp.reuse_message=1;
 794                 return(1);
 795                 }
 796
 797         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
 798                 {
 799                 al=SSL_AD_UNEXPECTED_MESSAGE;
 800                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
 801                 goto f_err;
 802                 }
 803         d=p=(unsigned char *)s->init_msg;
 804
 805         if ((sk=sk_X509_new_null()) == NULL)
 806                 {
 807                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
 808                 goto err;
 809                 }
 810
 811         n2l3(p,llen);
 812         if (llen+3 != n)
 813                 {
 814                 al=SSL_AD_DECODE_ERROR;
 815                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
 816                 goto f_err;
 817                 }
 818         for (nc=0; nc<llen; )
 819                 {
 820                 n2l3(p,l);
 821                 if ((l+nc+3) > llen)
 822                         {
 823                         al=SSL_AD_DECODE_ERROR;
 824                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
 825                         goto f_err;
 826                         }
 827
 828                 q=p;
 829                 x=d2i_X509(NULL,&q,l);
 830                 if (x == NULL)
 831                         {
 832                         al=SSL_AD_BAD_CERTIFICATE;
 833                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
 834                         goto f_err;
 835                         }
 836                 if (q != (p+l))
 837                         {
 838                         al=SSL_AD_DECODE_ERROR;
 839                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
 840                         goto f_err;
 841                         }
 842                 if (!sk_X509_push(sk,x))
 843                         {
 844                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
 845                         goto err;
 846                         }
 847                 x=NULL;
 848                 nc+=l+3;
 849                 p=q;
 850                 }
 851
 852         i=ssl_verify_cert_chain(s,sk);
 853         if ((s->verify_mode != SSL_VERIFY_NONE) && (!i)
 854 #ifndef OPENSSL_NO_KRB5
 855                 && (s->s3->tmp.new_cipher->algorithms & (SSL_MKEY_MASK|SSL_AUTH_MASK))
 856                 != (SSL_aKRB5|SSL_kKRB5)
 857 #endif /* OPENSSL_NO_KRB5 */
 858                 )
 859                 {
 860                 al=ssl_verify_alarm_type(s->verify_result);
 861                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
 862                 goto f_err;
 863                 }
 864         ERR_clear_error(); /* but we keep s->verify_result */
 865
 866         sc=ssl_sess_cert_new();
 867         if (sc == NULL) goto err;
 868
 869         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
 870         s->session->sess_cert=sc;
 871
 872         sc->cert_chain=sk;
 873         /* Inconsistency alert: cert_chain does include the peer's
 874          * certificate, which we don't include in s3_srvr.c */
 875         x=sk_X509_value(sk,0);
 876         sk=NULL;
 877         /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/
 878
 879         pkey=X509_get_pubkey(x);
 880
 881         /* VRS: allow null cert if auth == KRB5 */
 882         need_cert =     ((s->s3->tmp.new_cipher->algorithms
 883                         & (SSL_MKEY_MASK|SSL_AUTH_MASK))
 884                         == (SSL_aKRB5|SSL_kKRB5))? 0: 1;
 885
 886 #ifdef KSSL_DEBUG
 887         printf("pkey,x = %p, %p\n", pkey,x);
 888         printf("ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x,pkey));
 889         printf("cipher, alg, nc = %s, %lx, %d\n", s->s3->tmp.new_cipher->name,
 890                 s->s3->tmp.new_cipher->algorithms, need_cert);
 891 #endif    /* KSSL_DEBUG */
 892
 893         if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey)))
 894                 {
 895                 x=NULL;
 896                 al=SSL3_AL_FATAL;
 897                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
 898                         SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
 899                 goto f_err;
 900                 }
 901
 902         i=ssl_cert_type(x,pkey);
 903         if (need_cert && i < 0)
 904                 {
 905                 x=NULL;
 906                 al=SSL3_AL_FATAL;
 907                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
 908                         SSL_R_UNKNOWN_CERTIFICATE_TYPE);
 909                 goto f_err;
 910                 }
 911
 912         if (need_cert)
 913                 {
 914                 sc->peer_cert_type=i;
 915                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
 916                 /* Why would the following ever happen?
 917                  * We just created sc a couple of lines ago. */
 918                 if (sc->peer_pkeys[i].x509 != NULL)
 919                         X509_free(sc->peer_pkeys[i].x509);
 920                 sc->peer_pkeys[i].x509=x;
 921                 sc->peer_key= &(sc->peer_pkeys[i]);
 922
 923                 if (s->session->peer != NULL)
 924                         X509_free(s->session->peer);
 925                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
 926                 s->session->peer=x;
 927                 }
 928         else
 929                 {
 930                 sc->peer_cert_type=i;
 931                 sc->peer_key= NULL;
 932
 933                 if (s->session->peer != NULL)
 934                         X509_free(s->session->peer);
 935                 s->session->peer=NULL;
 936                 }
 937         s->session->verify_result = s->verify_result;
 938
 939         x=NULL;
 940         ret=1;
 941
 942         if (0)
 943                 {
 944 f_err:
 945                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
 946                 }
 947 err:
 948         EVP_PKEY_free(pkey);
 949         X509_free(x);
 950         sk_X509_pop_free(sk,X509_free);
 951         return(ret);
 952         }
 953
 954 static int ssl3_get_key_exchange(SSL *s)
 955         {
 956 #ifndef OPENSSL_NO_RSA
 957         unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
 958 #endif
 959         EVP_MD_CTX md_ctx;
 960         unsigned char *param,*p;
 961         int al,i,j,param_len,ok;
 962         long n,alg;
 963         EVP_PKEY *pkey=NULL;
 964 #ifndef OPENSSL_NO_RSA
 965         RSA *rsa=NULL;
 966 #endif
 967 #ifndef OPENSSL_NO_DH
 968         DH *dh=NULL;
 969 #endif
 970 #ifndef OPENSSL_NO_ECDH
 971         EC_KEY *ecdh = NULL;
 972         BN_CTX *bn_ctx = NULL;
 973         EC_POINT *srvr_ecpoint = NULL;
 974         int curve_nid = 0;
 975         int encoded_pt_len = 0;
 976 #endif
 977
 978         /* use same message size as in ssl3_get_certificate_request()
 979          * as ServerKeyExchange message may be skipped */
 980         n=ssl3_get_message(s,
 981                 SSL3_ST_CR_KEY_EXCH_A,
 982                 SSL3_ST_CR_KEY_EXCH_B,
 983                 -1,
 984                 s->max_cert_list,
 985                 &ok);
 986
 987         if (!ok) return((int)n);
 988
 989         if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
 990                 {
 991                 s->s3->tmp.reuse_message=1;
 992                 return(1);
 993                 }
 994
 995         param=p=(unsigned char *)s->init_msg;
 996
 997         if (s->session->sess_cert != NULL)
 998                 {
 999 #ifndef OPENSSL_NO_RSA
1000                 if (s->session->sess_cert->peer_rsa_tmp != NULL)
1001                         {
1002                         RSA_free(s->session->sess_cert->peer_rsa_tmp);
1003                         s->session->sess_cert->peer_rsa_tmp=NULL;
1004                         }
1005 #endif
1006 #ifndef OPENSSL_NO_DH
1007                 if (s->session->sess_cert->peer_dh_tmp)
1008                         {
1009                         DH_free(s->session->sess_cert->peer_dh_tmp);
1010                         s->session->sess_cert->peer_dh_tmp=NULL;
1011                         }
1012 #endif
1013 #ifndef OPENSSL_NO_ECDH
1014                 if (s->session->sess_cert->peer_ecdh_tmp)
1015                         {
1016                         EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp);
1017                         s->session->sess_cert->peer_ecdh_tmp=NULL;
1018                         }
1019 #endif
1020                 }
1021         else
1022                 {
1023                 s->session->sess_cert=ssl_sess_cert_new();
1024                 }
1025
1026         param_len=0;
1027         alg=s->s3->tmp.new_cipher->algorithms;
1028         EVP_MD_CTX_init(&md_ctx);
1029
1030 #ifndef OPENSSL_NO_RSA
1031         if (alg & SSL_kRSA)
1032                 {
1033                 if ((rsa=RSA_new()) == NULL)
1034                         {
1035                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1036                         goto err;
1037                         }
1038                 n2s(p,i);
1039                 param_len=i+2;
1040                 if (param_len > n)
1041                         {
1042                         al=SSL_AD_DECODE_ERROR;
1043                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
1044                         goto f_err;
1045                         }
1046                 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
1047                         {
1048                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1049                         goto err;
1050                         }
1051                 p+=i;
1052
1053                 n2s(p,i);
1054                 param_len+=i+2;
1055                 if (param_len > n)
1056                         {
1057                         al=SSL_AD_DECODE_ERROR;
1058                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
1059                         goto f_err;
1060                         }
1061                 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
1062                         {
1063                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1064                         goto err;
1065                         }
1066                 p+=i;
1067                 n-=param_len;
1068
1069                 /* this should be because we are using an export cipher */
1070                 if (alg & SSL_aRSA)
1071                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1072                 else
1073                         {
1074                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1075                         goto err;
1076                         }
1077                 s->session->sess_cert->peer_rsa_tmp=rsa;
1078                 rsa=NULL;
1079                 }
1080 #else /* OPENSSL_NO_RSA */
1081         if (0)
1082                 ;
1083 #endif
1084 #ifndef OPENSSL_NO_DH
1085         else if (alg & SSL_kEDH)
1086                 {
1087                 if ((dh=DH_new()) == NULL)
1088                         {
1089                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
1090                         goto err;
1091                         }
1092                 n2s(p,i);
1093                 param_len=i+2;
1094                 if (param_len > n)
1095                         {
1096                         al=SSL_AD_DECODE_ERROR;
1097                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
1098                         goto f_err;
1099                         }
1100                 if (!(dh->p=BN_bin2bn(p,i,NULL)))
1101                         {
1102                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1103                         goto err;
1104                         }
1105                 p+=i;
1106
1107                 n2s(p,i);
1108                 param_len+=i+2;
1109                 if (param_len > n)
1110                         {
1111                         al=SSL_AD_DECODE_ERROR;
1112                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
1113                         goto f_err;
1114                         }
1115                 if (!(dh->g=BN_bin2bn(p,i,NULL)))
1116                         {
1117                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1118                         goto err;
1119                         }
1120                 p+=i;
1121
1122                 n2s(p,i);
1123                 param_len+=i+2;
1124                 if (param_len > n)
1125                         {
1126                         al=SSL_AD_DECODE_ERROR;
1127                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
1128                         goto f_err;
1129                         }
1130                 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
1131                         {
1132                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1133                         goto err;
1134                         }
1135                 p+=i;
1136                 n-=param_len;
1137
1138 #ifndef OPENSSL_NO_RSA
1139                 if (alg & SSL_aRSA)
1140                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1141 #else
1142                 if (0)
1143                         ;
1144 #endif
1145 #ifndef OPENSSL_NO_DSA
1146                 else if (alg & SSL_aDSS)
1147                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1148 #endif
1149                 /* else anonymous DH, so no certificate or pkey. */
1150
1151                 s->session->sess_cert->peer_dh_tmp=dh;
1152                 dh=NULL;
1153                 }
1154         else if ((alg & SSL_kDHr) || (alg & SSL_kDHd))
1155                 {
1156                 al=SSL_AD_ILLEGAL_PARAMETER;
1157                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1158                 goto f_err;
1159                 }
1160 #endif /* !OPENSSL_NO_DH */
1161
1162 #ifndef OPENSSL_NO_ECDH
1163         else if (alg & SSL_kECDHE)
1164                 {
1165                 if ((ecdh=EC_KEY_new()) == NULL)
1166                         {
1167                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1168                         goto err;
1169                         }
1170
1171                 /* Extract elliptic curve parameters and the
1172                  * server's ephemeral ECDH public key.
1173                  * Keep accumulating lengths of various components in
1174                  * param_len and make sure it never exceeds n.
1175                  */
1176
1177                 /* XXX: For now we only support named (not generic) curves
1178                  * and the ECParameters in this case is just two bytes.
1179                  */
1180                 param_len=2;
1181                 if ((param_len > n) ||
1182                     (*p != NAMED_CURVE_TYPE) ||
1183                     ((curve_nid = curve_id2nid(*(p + 1))) == 0))
1184                         {
1185                         al=SSL_AD_INTERNAL_ERROR;
1186                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
1187                         goto f_err;
1188                         }
1189
1190                 if (!(ecdh->group=EC_GROUP_new_by_nid(curve_nid)))
1191                         {
1192                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1193                         goto err;
1194                         }
1195
1196                 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1197                     (EC_GROUP_get_degree(ecdh->group) > 163))
1198                         {
1199                         al=SSL_AD_EXPORT_RESTRICTION;
1200                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1201                         goto f_err;
1202                         }
1203
1204                 p+=2;
1205
1206                 /* Next, get the encoded ECPoint */
1207                 if (((srvr_ecpoint = EC_POINT_new(ecdh->group)) == NULL) ||
1208                     ((bn_ctx = BN_CTX_new()) == NULL))
1209                         {
1210                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1211                         goto err;
1212                         }
1213
1214                 encoded_pt_len = *p;  /* length of encoded point */
1215                 p+=1;
1216                 param_len += (1 + encoded_pt_len);
1217                 if ((param_len > n) ||
1218                     (EC_POINT_oct2point(ecdh->group, srvr_ecpoint,
1219                         p, encoded_pt_len, bn_ctx) == 0))
1220                         {
1221                         al=SSL_AD_DECODE_ERROR;
1222                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_ECPOINT);
1223                         goto f_err;
1224                         }
1225
1226                 n-=param_len;
1227                 p+=encoded_pt_len;
1228
1229                 /* The ECC/TLS specification does not mention
1230                  * the use of DSA to sign ECParameters in the server
1231                  * key exchange message. We do support RSA and ECDSA.
1232                  */
1233                 if (0) ;
1234 #ifndef OPENSSL_NO_RSA
1235                 else if (alg & SSL_aRSA)
1236                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1237 #endif
1238 #ifndef OPENSSL_NO_ECDSA
1239                 else if (alg & SSL_aECDSA)
1240                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1241 #endif
1242                 /* else anonymous ECDH, so no certificate or pkey. */
1243                 ecdh->pub_key = srvr_ecpoint;
1244                 s->session->sess_cert->peer_ecdh_tmp=ecdh;
1245                 ecdh=NULL;
1246                 BN_CTX_free(bn_ctx);
1247                 srvr_ecpoint = NULL;
1248                 }
1249         else if (alg & SSL_kECDH)
1250                 {
1251                 al=SSL_AD_UNEXPECTED_MESSAGE;
1252                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1253                 goto f_err;
1254                 }
1255 #endif /* !OPENSSL_NO_ECDH */
1256         if (alg & SSL_aFZA)
1257                 {
1258                 al=SSL_AD_HANDSHAKE_FAILURE;
1259                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1260                 goto f_err;
1261                 }
1262
1263
1264         /* p points to the next byte, there are 'n' bytes left */
1265
1266         /* if it was signed, check the signature */
1267         if (pkey != NULL)
1268                 {
1269                 n2s(p,i);
1270                 n-=2;
1271                 j=EVP_PKEY_size(pkey);
1272
1273                 if ((i != n) || (n > j) || (n <= 0))
1274                         {
1275                         /* wrong packet length */
1276                         al=SSL_AD_DECODE_ERROR;
1277                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1278                         goto f_err;
1279                         }
1280
1281 #ifndef OPENSSL_NO_RSA
1282                 if (pkey->type == EVP_PKEY_RSA)
1283                         {
1284                         int num;
1285
1286                         j=0;
1287                         q=md_buf;
1288                         for (num=2; num > 0; num--)
1289                                 {
1290                                 EVP_DigestInit_ex(&md_ctx,(num == 2)
1291                                         ?s->ctx->md5:s->ctx->sha1, NULL);
1292                                 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1293                                 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1294                                 EVP_DigestUpdate(&md_ctx,param,param_len);
1295                                 EVP_DigestFinal_ex(&md_ctx,q,(unsigned int *)&i);
1296                                 q+=i;
1297                                 j+=i;
1298                                 }
1299                         i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
1300                                                                 pkey->pkey.rsa);
1301                         if (i < 0)
1302                                 {
1303                                 al=SSL_AD_DECRYPT_ERROR;
1304                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1305                                 goto f_err;
1306                                 }
1307                         if (i == 0)
1308                                 {
1309                                 /* bad signature */
1310                                 al=SSL_AD_DECRYPT_ERROR;
1311                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1312                                 goto f_err;
1313                                 }
1314                         }
1315                 else
1316 #endif
1317 #ifndef OPENSSL_NO_DSA
1318                         if (pkey->type == EVP_PKEY_DSA)
1319                         {
1320                         /* lets do DSS */
1321                         EVP_VerifyInit_ex(&md_ctx,EVP_dss1(), NULL);
1322                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1323                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1324                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1325                         if (!EVP_VerifyFinal(&md_ctx,p,(int)n,pkey))
1326                                 {
1327                                 /* bad signature */
1328                                 al=SSL_AD_DECRYPT_ERROR;
1329                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1330                                 goto f_err;
1331                                 }
1332                         }
1333                 else
1334 #endif
1335 #ifndef OPENSSL_NO_ECDSA
1336                         if (pkey->type == EVP_PKEY_EC)
1337                         {
1338                         /* let's do ECDSA */
1339                         EVP_VerifyInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1340                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1341                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1342                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1343                         if (!EVP_VerifyFinal(&md_ctx,p,(int)n,pkey))
1344                                 {
1345                                 /* bad signature */
1346                                 al=SSL_AD_DECRYPT_ERROR;
1347                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1348                                 goto f_err;
1349                                 }
1350                         }
1351                 else
1352 #endif
1353                         {
1354                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1355                         goto err;
1356                         }
1357                 }
1358         else
1359                 {
1360                 /* still data left over */
1361                 if (!(alg & SSL_aNULL))
1362                         {
1363                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1364                         goto err;
1365                         }
1366                 if (n != 0)
1367                         {
1368                         al=SSL_AD_DECODE_ERROR;
1369                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
1370                         goto f_err;
1371                         }
1372                 }
1373         EVP_PKEY_free(pkey);
1374         EVP_MD_CTX_cleanup(&md_ctx);
1375         return(1);
1376 f_err:
1377         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1378 err:
1379         EVP_PKEY_free(pkey);
1380 #ifndef OPENSSL_NO_RSA
1381         if (rsa != NULL)
1382                 RSA_free(rsa);
1383 #endif
1384 #ifndef OPENSSL_NO_DH
1385         if (dh != NULL)
1386                 DH_free(dh);
1387 #endif
1388 #ifndef OPENSSL_NO_ECDH
1389         BN_CTX_free(bn_ctx);
1390         EC_POINT_free(srvr_ecpoint);
1391         if (ecdh != NULL)
1392                 EC_KEY_free(ecdh);
1393 #endif
1394         EVP_MD_CTX_cleanup(&md_ctx);
1395         return(-1);
1396         }
1397
1398 static int ssl3_get_certificate_request(SSL *s)
1399         {
1400         int ok,ret=0;
1401         unsigned long n,nc,l;
1402         unsigned int llen,ctype_num,i;
1403         X509_NAME *xn=NULL;
1404         unsigned char *p,*d,*q;
1405         STACK_OF(X509_NAME) *ca_sk=NULL;
1406
1407         n=ssl3_get_message(s,
1408                 SSL3_ST_CR_CERT_REQ_A,
1409                 SSL3_ST_CR_CERT_REQ_B,
1410                 -1,
1411                 s->max_cert_list,
1412                 &ok);
1413
1414         if (!ok) return((int)n);
1415
1416         s->s3->tmp.cert_req=0;
1417
1418         if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
1419                 {
1420                 s->s3->tmp.reuse_message=1;
1421                 return(1);
1422                 }
1423
1424         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
1425                 {
1426                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1427                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
1428                 goto err;
1429                 }
1430
1431         /* TLS does not like anon-DH with client cert */
1432         if (s->version > SSL3_VERSION)
1433                 {
1434                 l=s->s3->tmp.new_cipher->algorithms;
1435                 if (l & SSL_aNULL)
1436                         {
1437                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1438                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
1439                         goto err;
1440                         }
1441                 }
1442
1443         d=p=(unsigned char *)s->init_msg;
1444
1445         if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
1446                 {
1447                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1448                 goto err;
1449                 }
1450
1451         /* get the certificate types */
1452         ctype_num= *(p++);
1453         if (ctype_num > SSL3_CT_NUMBER)
1454                 ctype_num=SSL3_CT_NUMBER;
1455         for (i=0; i<ctype_num; i++)
1456                 s->s3->tmp.ctype[i]= p[i];
1457         p+=ctype_num;
1458
1459         /* get the CA RDNs */
1460         n2s(p,llen);
1461 #if 0
1462 {
1463 FILE *out;
1464 out=fopen("/tmp/vsign.der","w");
1465 fwrite(p,1,llen,out);
1466 fclose(out);
1467 }
1468 #endif
1469
1470         if ((llen+ctype_num+2+1) != n)
1471                 {
1472                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1473                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
1474                 goto err;
1475                 }
1476
1477         for (nc=0; nc<llen; )
1478                 {
1479                 n2s(p,l);
1480                 if ((l+nc+2) > llen)
1481                         {
1482                         if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1483                                 goto cont; /* netscape bugs */
1484                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1485                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
1486                         goto err;
1487                         }
1488
1489                 q=p;
1490
1491                 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
1492                         {
1493                         /* If netscape tolerance is on, ignore errors */
1494                         if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
1495                                 goto cont;
1496                         else
1497                                 {
1498                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1499                                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
1500                                 goto err;
1501                                 }
1502                         }
1503
1504                 if (q != (p+l))
1505                         {
1506                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1507                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
1508                         goto err;
1509                         }
1510                 if (!sk_X509_NAME_push(ca_sk,xn))
1511                         {
1512                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1513                         goto err;
1514                         }
1515
1516                 p+=l;
1517                 nc+=l+2;
1518                 }
1519
1520         if (0)
1521                 {
1522 cont:
1523                 ERR_clear_error();
1524                 }
1525
1526         /* we should setup a certificate to return.... */
1527         s->s3->tmp.cert_req=1;
1528         s->s3->tmp.ctype_num=ctype_num;
1529         if (s->s3->tmp.ca_names != NULL)
1530                 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
1531         s->s3->tmp.ca_names=ca_sk;
1532         ca_sk=NULL;
1533
1534         ret=1;
1535 err:
1536         if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
1537         return(ret);
1538         }
1539
1540 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
1541         {
1542         return(X509_NAME_cmp(*a,*b));
1543         }
1544
1545 static int ssl3_get_server_done(SSL *s)
1546         {
1547         int ok,ret=0;
1548         long n;
1549
1550         n=ssl3_get_message(s,
1551                 SSL3_ST_CR_SRVR_DONE_A,
1552                 SSL3_ST_CR_SRVR_DONE_B,
1553                 SSL3_MT_SERVER_DONE,
1554                 30, /* should be very small, like 0 :-) */
1555                 &ok);
1556
1557         if (!ok) return((int)n);
1558         if (n > 0)
1559                 {
1560                 /* should contain no data */
1561                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1562                 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
1563                 return -1;
1564                 }
1565         ret=1;
1566         return(ret);
1567         }
1568
1569 static int ssl3_send_client_key_exchange(SSL *s)
1570         {
1571         unsigned char *p,*d;
1572         int n;
1573         unsigned long l;
1574 #ifndef OPENSSL_NO_RSA
1575         unsigned char *q;
1576         EVP_PKEY *pkey=NULL;
1577 #endif
1578 #ifndef OPENSSL_NO_KRB5
1579         KSSL_ERR kssl_err;
1580 #endif /* OPENSSL_NO_KRB5 */
1581 #ifndef OPENSSL_NO_ECDH
1582         EC_KEY *clnt_ecdh = NULL;
1583         EC_POINT *srvr_ecpoint = NULL;
1584         EVP_PKEY *srvr_pub_pkey = NULL;
1585         unsigned char *encodedPoint = NULL;
1586         int encoded_pt_len = 0;
1587         BN_CTX * bn_ctx = NULL;
1588 #endif
1589
1590         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
1591                 {
1592                 d=(unsigned char *)s->init_buf->data;
1593                 p= &(d[4]);
1594
1595                 l=s->s3->tmp.new_cipher->algorithms;
1596
1597                 /* Fool emacs indentation */
1598                 if (0) {}
1599 #ifndef OPENSSL_NO_RSA
1600                 else if (l & SSL_kRSA)
1601                         {
1602                         RSA *rsa;
1603                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1604
1605                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
1606                                 rsa=s->session->sess_cert->peer_rsa_tmp;
1607                         else
1608                                 {
1609                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1610                                 if ((pkey == NULL) ||
1611                                         (pkey->type != EVP_PKEY_RSA) ||
1612                                         (pkey->pkey.rsa == NULL))
1613                                         {
1614                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1615                                         goto err;
1616                                         }
1617                                 rsa=pkey->pkey.rsa;
1618                                 EVP_PKEY_free(pkey);
1619                                 }
1620
1621                         tmp_buf[0]=s->client_version>>8;
1622                         tmp_buf[1]=s->client_version&0xff;
1623                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
1624                                         goto err;
1625
1626                         s->session->master_key_length=sizeof tmp_buf;
1627
1628                         q=p;
1629                         /* Fix buf for TLS and beyond */
1630                         if (s->version > SSL3_VERSION)
1631                                 p+=2;
1632                         n=RSA_public_encrypt(sizeof tmp_buf,
1633                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
1634 #ifdef PKCS1_CHECK
1635                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
1636                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
1637 #endif
1638                         if (n <= 0)
1639                                 {
1640                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
1641                                 goto err;
1642                                 }
1643
1644                         /* Fix buf for TLS and beyond */
1645                         if (s->version > SSL3_VERSION)
1646                                 {
1647                                 s2n(n,q);
1648                                 n+=2;
1649                                 }
1650
1651                         s->session->master_key_length=
1652                                 s->method->ssl3_enc->generate_master_secret(s,
1653                                         s->session->master_key,
1654                                         tmp_buf,sizeof tmp_buf);
1655                         memset(tmp_buf,0,sizeof tmp_buf);
1656                         }
1657 #endif
1658 #ifndef OPENSSL_NO_KRB5
1659                 else if (l & SSL_kKRB5)
1660                         {
1661                         krb5_error_code krb5rc;
1662                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
1663                         /*  krb5_data   krb5_ap_req;  */
1664                         krb5_data       *enc_ticket;
1665                         krb5_data       authenticator, *authp = NULL;
1666                         EVP_CIPHER_CTX  ciph_ctx;
1667                         EVP_CIPHER      *enc = NULL;
1668                         unsigned char   iv[EVP_MAX_IV_LENGTH];
1669                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1670                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH
1671                                                 + EVP_MAX_IV_LENGTH];
1672                         int             padl, outl = sizeof(epms);
1673
1674                         EVP_CIPHER_CTX_init(&ciph_ctx);
1675
1676 #ifdef KSSL_DEBUG
1677                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
1678                                 l, SSL_kKRB5);
1679 #endif  /* KSSL_DEBUG */
1680
1681                         authp = NULL;
1682 #ifdef KRB5SENDAUTH
1683                         if (KRB5SENDAUTH)  authp = &authenticator;
1684 #endif  /* KRB5SENDAUTH */
1685
1686                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
1687                                 &kssl_err);
1688                         enc = kssl_map_enc(kssl_ctx->enctype);
1689                         if (enc == NULL)
1690                             goto err;
1691 #ifdef KSSL_DEBUG
1692                         {
1693                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
1694                         if (krb5rc && kssl_err.text)
1695                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
1696                         }
1697 #endif  /* KSSL_DEBUG */
1698
1699                         if (krb5rc)
1700                                 {
1701                                 ssl3_send_alert(s,SSL3_AL_FATAL,
1702                                                 SSL_AD_HANDSHAKE_FAILURE);
1703                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1704                                                 kssl_err.reason);
1705                                 goto err;
1706                                 }
1707
1708                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
1709                         **  in place of RFC 2712 KerberosWrapper, as in:
1710                         **
1711                         **  Send ticket (copy to *p, set n = length)
1712                         **  n = krb5_ap_req.length;
1713                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
1714                         **  if (krb5_ap_req.data)
1715                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
1716                         **
1717                         **  Now using real RFC 2712 KerberosWrapper
1718                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
1719                         **  Note: 2712 "opaque" types are here replaced
1720                         **  with a 2-byte length followed by the value.
1721                         **  Example:
1722                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
1723                         **  Where "xx xx" = length bytes.  Shown here with
1724                         **  optional authenticator omitted.
1725                         */
1726
1727                         /*  KerberosWrapper.Ticket              */
1728                         s2n(enc_ticket->length,p);
1729                         memcpy(p, enc_ticket->data, enc_ticket->length);
1730                         p+= enc_ticket->length;
1731                         n = enc_ticket->length + 2;
1732
1733                         /*  KerberosWrapper.Authenticator       */
1734                         if (authp  &&  authp->length)
1735                                 {
1736                                 s2n(authp->length,p);
1737                                 memcpy(p, authp->data, authp->length);
1738                                 p+= authp->length;
1739                                 n+= authp->length + 2;
1740
1741                                 free(authp->data);
1742                                 authp->data = NULL;
1743                                 authp->length = 0;
1744                                 }
1745                         else
1746                                 {
1747                                 s2n(0,p);/*  null authenticator length  */
1748                                 n+=2;
1749                                 }
1750
1751                         if (RAND_bytes(tmp_buf,sizeof tmp_buf) <= 0)
1752                             goto err;
1753
1754                         /*  20010420 VRS.  Tried it this way; failed.
1755                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
1756                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
1757                         **                              kssl_ctx->length);
1758                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
1759                         */
1760
1761                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
1762                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
1763                                 kssl_ctx->key,iv);
1764                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
1765                                 sizeof tmp_buf);
1766                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
1767                         outl += padl;
1768                         if (outl > sizeof epms)
1769                                 {
1770                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1771                                 goto err;
1772                                 }
1773                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
1774
1775                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
1776                         s2n(outl,p);
1777                         memcpy(p, epms, outl);
1778                         p+=outl;
1779                         n+=outl + 2;
1780
1781                         s->session->master_key_length=
1782                                 s->method->ssl3_enc->generate_master_secret(s,
1783                                         s->session->master_key,
1784                                         tmp_buf, sizeof tmp_buf);
1785
1786                         memset(tmp_buf, 0, sizeof tmp_buf);
1787                         memset(epms, 0, outl);
1788                         }
1789 #endif
1790 #ifndef OPENSSL_NO_DH
1791                 else if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1792                         {
1793                         DH *dh_srvr,*dh_clnt;
1794
1795                         if (s->session->sess_cert->peer_dh_tmp != NULL)
1796                                 dh_srvr=s->session->sess_cert->peer_dh_tmp;
1797                         else
1798                                 {
1799                                 /* we get them from the cert */
1800                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1801                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
1802                                 goto err;
1803                                 }
1804
1805                         /* generate a new random key */
1806                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
1807                                 {
1808                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1809                                 goto err;
1810                                 }
1811                         if (!DH_generate_key(dh_clnt))
1812                                 {
1813                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1814                                 goto err;
1815                                 }
1816
1817                         /* use the 'p' output buffer for the DH key, but
1818                          * make sure to clear it out afterwards */
1819
1820                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
1821
1822                         if (n <= 0)
1823                                 {
1824                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1825                                 goto err;
1826                                 }
1827
1828                         /* generate master key from the result */
1829                         s->session->master_key_length=
1830                                 s->method->ssl3_enc->generate_master_secret(s,
1831                                         s->session->master_key,p,n);
1832                         /* clean up */
1833                         memset(p,0,n);
1834
1835                         /* send off the data */
1836                         n=BN_num_bytes(dh_clnt->pub_key);
1837                         s2n(n,p);
1838                         BN_bn2bin(dh_clnt->pub_key,p);
1839                         n+=2;
1840
1841                         DH_free(dh_clnt);
1842
1843                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
1844                         }
1845 #endif
1846
1847 #ifndef OPENSSL_NO_ECDH
1848                 else if ((l & SSL_kECDH) || (l & SSL_kECDHE))
1849                         {
1850                         EC_GROUP *srvr_group = NULL;
1851                         int ecdh_clnt_cert = 0;
1852
1853                         /* Did we send out the client's
1854                          * ECDH share for use in premaster
1855                          * computation as part of client certificate?
1856                          * If so, set ecdh_clnt_cert to 1.
1857                          */
1858                         if ((l & SSL_kECDH) && (s->cert != NULL))
1859                                 {
1860                                 /* XXX: For now, we do not support client
1861                                  * authentication using ECDH certificates.
1862                                  * To add such support, one needs to add
1863                                  * code that checks for appropriate
1864                                  * conditions and sets ecdh_clnt_cert to 1.
1865                                  * For example, the cert have an ECC
1866                                  * key on the same curve as the server's
1867                                  * and the key should be authorized for
1868                                  * key agreement.
1869                                  *
1870                                  * One also needs to add code in ssl3_connect
1871                                  * to skip sending the certificate verify
1872                                  * message.
1873                                  *
1874                                  * if ((s->cert->key->privatekey != NULL) &&
1875                                  *     (s->cert->key->privatekey->type ==
1876                                  *      EVP_PKEY_EC) && ...)
1877                                  * ecdh_clnt_cert = 1;
1878                                  */
1879                                 }
1880
1881                         if (s->session->sess_cert->peer_ecdh_tmp != NULL)
1882                                 {
1883                                 srvr_group = s->session->sess_cert-> \
1884                                     peer_ecdh_tmp->group;
1885                                 srvr_ecpoint = s->session->sess_cert-> \
1886                                     peer_ecdh_tmp->pub_key;
1887                                 }
1888                         else
1889                                 {
1890                                 /* Get the Server Public Key from Cert */
1891                                 srvr_pub_pkey = X509_get_pubkey(s->session-> \
1892                                     sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1893                                 if ((srvr_pub_pkey == NULL) ||
1894                                     (srvr_pub_pkey->type != EVP_PKEY_EC) ||
1895                                     (srvr_pub_pkey->pkey.eckey == NULL))
1896                                         {
1897                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1898                                             ERR_R_INTERNAL_ERROR);
1899                                         goto err;
1900                                         }
1901
1902                                 srvr_group = srvr_pub_pkey->pkey.eckey->group;
1903                                 srvr_ecpoint =
1904                                     srvr_pub_pkey->pkey.eckey->pub_key;
1905                                 }
1906
1907                         if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
1908                                 {
1909                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1910                                     ERR_R_INTERNAL_ERROR);
1911                                 goto err;
1912                                 }
1913
1914                         if ((clnt_ecdh=EC_KEY_new()) == NULL)
1915                                 {
1916                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1917                                 goto err;
1918                                 }
1919
1920                         clnt_ecdh->group = srvr_group;
1921                         if (ecdh_clnt_cert)
1922                                 {
1923                                 /* Reuse key info from our certificate
1924                                  * We only need our private key to perform
1925                                  * the ECDH computation.
1926                                  */
1927                                 clnt_ecdh->priv_key = BN_dup(s->cert->key-> \
1928                                     privatekey->pkey.eckey->priv_key);
1929                                 }
1930                         else
1931                                 {
1932                                 /* Generate a new ECDH key pair */
1933                                 if (!(EC_KEY_generate_key(clnt_ecdh)))
1934                                         {
1935                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
1936                                         goto err;
1937                                         }
1938                                 }
1939
1940                         /* use the 'p' output buffer for the ECDH key, but
1941                          * make sure to clear it out afterwards
1942                          */
1943
1944                         n=ECDH_compute_key(p, srvr_ecpoint, clnt_ecdh);
1945                         if (n <= 0)
1946                                 {
1947                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1948                                        ERR_R_ECDH_LIB);
1949                                 goto err;
1950                                 }
1951
1952                         /* generate master key from the result */
1953                         s->session->master_key_length = s->method->ssl3_enc \
1954                             -> generate_master_secret(s,
1955                                 s->session->master_key,
1956                                 p, n);
1957
1958                         memset(p, 0, n); /* clean up */
1959
1960                         if (ecdh_clnt_cert)
1961                                 {
1962                                 /* Send empty client key exch message */
1963                                 n = 0;
1964                                 }
1965                         else
1966                                 {
1967                                 /* First check the size of encoding and
1968                                  * allocate memory accordingly.
1969                                  */
1970                                 encoded_pt_len =
1971                                     EC_POINT_point2oct(clnt_ecdh->group,
1972                                         clnt_ecdh->pub_key,
1973                                         POINT_CONVERSION_UNCOMPRESSED,
1974                                         NULL, 0, NULL);
1975
1976                                 encodedPoint = (unsigned char *)
1977                                     OPENSSL_malloc(encoded_pt_len *
1978                                         sizeof(unsigned char));
1979                                 bn_ctx = BN_CTX_new();
1980                                 if ((encodedPoint == NULL) ||
1981                                     (bn_ctx == NULL))
1982                                         {
1983                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1984                                         goto err;
1985                                         }
1986
1987                                 /* Encode the public key */
1988                                 n = EC_POINT_point2oct(clnt_ecdh->group,
1989                                     clnt_ecdh->pub_key,
1990                                     POINT_CONVERSION_UNCOMPRESSED,
1991                                     encodedPoint, encoded_pt_len, bn_ctx);
1992
1993                                 *p = n; /* length of encoded point */
1994                                 /* Encoded point will be copied here */
1995                                 p += 1;
1996                                 /* copy the point */
1997                                 memcpy((unsigned char *)p, encodedPoint, n);
1998                                 /* increment n to account for length field */
1999                                 n += 1;
2000                                 }
2001
2002                         /* Free allocated memory */
2003                         BN_CTX_free(bn_ctx);
2004                         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2005                         if (clnt_ecdh != NULL)
2006                                 {
2007                                  /* group is shared */
2008                                  clnt_ecdh->group = NULL;
2009                                  EC_KEY_free(clnt_ecdh);
2010                                 }
2011                         EVP_PKEY_free(srvr_pub_pkey);
2012                         }
2013 #endif /* !OPENSSL_NO_ECDH */
2014                 else
2015                         {
2016                         ssl3_send_alert(s, SSL3_AL_FATAL,
2017                             SSL_AD_HANDSHAKE_FAILURE);
2018                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2019                             ERR_R_INTERNAL_ERROR);
2020                         goto err;
2021                         }
2022
2023                 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
2024                 l2n3(n,d);
2025
2026                 s->state=SSL3_ST_CW_KEY_EXCH_B;
2027                 /* number of bytes to write */
2028                 s->init_num=n+4;
2029                 s->init_off=0;
2030                 }
2031
2032         /* SSL3_ST_CW_KEY_EXCH_B */
2033         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2034 err:
2035 #ifndef OPENSSL_NO_ECDH
2036         BN_CTX_free(bn_ctx);
2037         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2038         if (clnt_ecdh != NULL)
2039                 {
2040                 /* group is shared */
2041                 clnt_ecdh->group = NULL;
2042                 EC_KEY_free(clnt_ecdh);
2043                 }
2044         EVP_PKEY_free(srvr_pub_pkey);
2045 #endif
2046         return(-1);
2047         }
2048
2049 static int ssl3_send_client_verify(SSL *s)
2050         {
2051         unsigned char *p,*d;
2052         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
2053         EVP_PKEY *pkey;
2054 #ifndef OPENSSL_NO_RSA
2055         unsigned u=0;
2056 #endif
2057         unsigned long n;
2058 #ifndef OPENSSL_NO_DSA
2059         int j;
2060 #endif
2061
2062         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
2063                 {
2064                 d=(unsigned char *)s->init_buf->data;
2065                 p= &(d[4]);
2066                 pkey=s->cert->key->privatekey;
2067
2068                 s->method->ssl3_enc->cert_verify_mac(s,&(s->s3->finish_dgst2),
2069                         &(data[MD5_DIGEST_LENGTH]));
2070
2071 #ifndef OPENSSL_NO_RSA
2072                 if (pkey->type == EVP_PKEY_RSA)
2073                         {
2074                         s->method->ssl3_enc->cert_verify_mac(s,
2075                                 &(s->s3->finish_dgst1),&(data[0]));
2076                         if (RSA_sign(NID_md5_sha1, data,
2077                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
2078                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
2079                                 {
2080                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
2081                                 goto err;
2082                                 }
2083                         s2n(u,p);
2084                         n=u+2;
2085                         }
2086                 else
2087 #endif
2088 #ifndef OPENSSL_NO_DSA
2089                         if (pkey->type == EVP_PKEY_DSA)
2090                         {
2091                         if (!DSA_sign(pkey->save_type,
2092                                 &(data[MD5_DIGEST_LENGTH]),
2093                                 SHA_DIGEST_LENGTH,&(p[2]),
2094                                 (unsigned int *)&j,pkey->pkey.dsa))
2095                                 {
2096                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
2097                                 goto err;
2098                                 }
2099                         s2n(j,p);
2100                         n=j+2;
2101                         }
2102                 else
2103 #endif
2104 #ifndef OPENSSL_NO_ECDSA
2105                         if (pkey->type == EVP_PKEY_EC)
2106                         {
2107                         if (!ECDSA_sign(pkey->save_type,
2108                                 &(data[MD5_DIGEST_LENGTH]),
2109                                 SHA_DIGEST_LENGTH,&(p[2]),
2110                                 (unsigned int *)&j,pkey->pkey.eckey))
2111                                 {
2112                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
2113                                     ERR_R_ECDSA_LIB);
2114                                 goto err;
2115                                 }
2116                         s2n(j,p);
2117                         n=j+2;
2118                         }
2119                 else
2120 #endif
2121                         {
2122                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
2123                         goto err;
2124                         }
2125                 *(d++)=SSL3_MT_CERTIFICATE_VERIFY;
2126                 l2n3(n,d);
2127
2128                 s->init_num=(int)n+4;
2129                 s->init_off=0;
2130                 }
2131         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2132 err:
2133         return(-1);
2134         }
2135
2136 static int ssl3_send_client_certificate(SSL *s)
2137         {
2138         X509 *x509=NULL;
2139         EVP_PKEY *pkey=NULL;
2140         int i;
2141         unsigned long l;
2142
2143         if (s->state == SSL3_ST_CW_CERT_A)
2144                 {
2145                 if ((s->cert == NULL) ||
2146                         (s->cert->key->x509 == NULL) ||
2147                         (s->cert->key->privatekey == NULL))
2148                         s->state=SSL3_ST_CW_CERT_B;
2149                 else
2150                         s->state=SSL3_ST_CW_CERT_C;
2151                 }
2152
2153         /* We need to get a client cert */
2154         if (s->state == SSL3_ST_CW_CERT_B)
2155                 {
2156                 /* If we get an error, we need to
2157                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
2158                  * We then get retied later */
2159                 i=0;
2160                 if (s->ctx->client_cert_cb != NULL)
2161                         i=s->ctx->client_cert_cb(s,&(x509),&(pkey));
2162                 if (i < 0)
2163                         {
2164                         s->rwstate=SSL_X509_LOOKUP;
2165                         return(-1);
2166                         }
2167                 s->rwstate=SSL_NOTHING;
2168                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
2169                         {
2170                         s->state=SSL3_ST_CW_CERT_B;
2171                         if (    !SSL_use_certificate(s,x509) ||
2172                                 !SSL_use_PrivateKey(s,pkey))
2173                                 i=0;
2174                         }
2175                 else if (i == 1)
2176                         {
2177                         i=0;
2178                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
2179                         }
2180
2181                 if (x509 != NULL) X509_free(x509);
2182                 if (pkey != NULL) EVP_PKEY_free(pkey);
2183                 if (i == 0)
2184                         {
2185                         if (s->version == SSL3_VERSION)
2186                                 {
2187                                 s->s3->tmp.cert_req=0;
2188                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
2189                                 return(1);
2190                                 }
2191                         else
2192                                 {
2193                                 s->s3->tmp.cert_req=2;
2194                                 }
2195                         }
2196
2197                 /* Ok, we have a cert */
2198                 s->state=SSL3_ST_CW_CERT_C;
2199                 }
2200
2201         if (s->state == SSL3_ST_CW_CERT_C)
2202                 {
2203                 s->state=SSL3_ST_CW_CERT_D;
2204                 l=ssl3_output_cert_chain(s,
2205                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
2206                 s->init_num=(int)l;
2207                 s->init_off=0;
2208                 }
2209         /* SSL3_ST_CW_CERT_D */
2210         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2211         }
2212
2213 #define has_bits(i,m)   (((i)&(m)) == (m))
2214
2215 static int ssl3_check_cert_and_algorithm(SSL *s)
2216         {
2217         int i,idx;
2218         long algs;
2219         EVP_PKEY *pkey=NULL;
2220         SESS_CERT *sc;
2221 #ifndef OPENSSL_NO_RSA
2222         RSA *rsa;
2223 #endif
2224 #ifndef OPENSSL_NO_DH
2225         DH *dh;
2226 #endif
2227
2228         sc=s->session->sess_cert;
2229
2230         if (sc == NULL)
2231                 {
2232                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,ERR_R_INTERNAL_ERROR);
2233                 goto err;
2234                 }
2235
2236         algs=s->s3->tmp.new_cipher->algorithms;
2237
2238         /* we don't have a certificate */
2239         if (algs & (SSL_aDH|SSL_aNULL|SSL_aKRB5))
2240                 return(1);
2241
2242 #ifndef OPENSSL_NO_RSA
2243         rsa=s->session->sess_cert->peer_rsa_tmp;
2244 #endif
2245 #ifndef OPENSSL_NO_DH
2246         dh=s->session->sess_cert->peer_dh_tmp;
2247 #endif
2248
2249         /* This is the passed certificate */
2250
2251         idx=sc->peer_cert_type;
2252 #ifndef OPENSSL_NO_ECDH
2253         if (idx == SSL_PKEY_ECC)
2254                 {
2255                 if (check_srvr_ecc_cert_and_alg(sc->peer_pkeys[idx].x509,
2256                     s->s3->tmp.new_cipher) == 0)
2257                         { /* check failed */
2258                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_BAD_ECC_CERT);
2259                         goto f_err;
2260                         }
2261                 else
2262                         {
2263                         return 1;
2264                         }
2265                 }
2266 #endif
2267         pkey=X509_get_pubkey(sc->peer_pkeys[idx].x509);
2268         i=X509_certificate_type(sc->peer_pkeys[idx].x509,pkey);
2269         EVP_PKEY_free(pkey);
2270
2271
2272         /* Check that we have a certificate if we require one */
2273         if ((algs & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
2274                 {
2275                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
2276                 goto f_err;
2277                 }
2278 #ifndef OPENSSL_NO_DSA
2279         else if ((algs & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
2280                 {
2281                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
2282                 goto f_err;
2283                 }
2284 #endif
2285 #ifndef OPENSSL_NO_RSA
2286         if ((algs & SSL_kRSA) &&
2287                 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
2288                 {
2289                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
2290                 goto f_err;
2291                 }
2292 #endif
2293 #ifndef OPENSSL_NO_DH
2294         if ((algs & SSL_kEDH) &&
2295                 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
2296                 {
2297                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
2298                 goto f_err;
2299                 }
2300         else if ((algs & SSL_kDHr) && !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
2301                 {
2302                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
2303                 goto f_err;
2304                 }
2305 #ifndef OPENSSL_NO_DSA
2306         else if ((algs & SSL_kDHd) && !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
2307                 {
2308                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
2309                 goto f_err;
2310                 }
2311 #endif
2312 #endif
2313
2314         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i,EVP_PKT_EXP))
2315                 {
2316 #ifndef OPENSSL_NO_RSA
2317                 if (algs & SSL_kRSA)
2318                         {
2319                         if (rsa == NULL
2320                             || RSA_size(rsa) > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
2321                                 {
2322                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
2323                                 goto f_err;
2324                                 }
2325                         }
2326                 else
2327 #endif
2328 #ifndef OPENSSL_NO_DH
2329                         if (algs & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2330                             {
2331                             if (dh == NULL
2332                                 || DH_size(dh) > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
2333                                 {
2334                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
2335                                 goto f_err;
2336                                 }
2337                         }
2338                 else
2339 #endif
2340                         {
2341                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
2342                         goto f_err;
2343                         }
2344                 }
2345         return(1);
2346 f_err:
2347         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
2348 err:
2349         return(0);
2350         }
2351
2352
2353 #ifndef OPENSSL_NO_ECDH
2354 /* This is the complement of nid2curve_id in s3_srvr.c. */
2355 static int curve_id2nid(int curve_id)
2356 {
2357         /* ECC curves from draft-ietf-tls-ecc-01.txt (Mar 15, 2001) */
2358         static int nid_list[26] =
2359         {
2360                 0,
2361                 NID_sect163k1, /* sect163k1 (1) */
2362                 NID_sect163r1, /* sect163r1 (2) */
2363                 NID_sect163r2, /* sect163r2 (3) */
2364                 NID_sect193r1, /* sect193r1 (4) */
2365                 NID_sect193r2, /* sect193r2 (5) */
2366                 NID_sect233k1, /* sect233k1 (6) */
2367                 NID_sect233r1, /* sect233r1 (7) */
2368                 NID_sect239k1, /* sect239k1 (8) */
2369                 NID_sect283k1, /* sect283k1 (9) */
2370                 NID_sect283r1, /* sect283r1 (10) */
2371                 NID_sect409k1, /* sect409k1 (11) */
2372                 NID_sect409r1, /* sect409r1 (12) */
2373                 NID_sect571k1, /* sect571k1 (13) */
2374                 NID_sect571r1, /* sect571r1 (14) */
2375                 NID_secp160k1, /* secp160k1 (15) */
2376                 NID_secp160r1, /* secp160r1 (16) */
2377                 NID_secp160r2, /* secp160r2 (17) */
2378                 NID_secp192k1, /* secp192k1 (18) */
2379                 NID_X9_62_prime192v1, /* secp192r1 (19) */
2380                 NID_secp224k1, /* secp224k1 (20) */
2381                 NID_secp224r1, /* secp224r1 (21) */
2382                 NID_secp256k1, /* secp256k1 (22) */
2383                 NID_X9_62_prime256v1, /* secp256r1 (23) */
2384                 NID_secp384r1, /* secp384r1 (24) */
2385                 NID_secp521r1  /* secp521r1 (25) */
2386         };
2387
2388         if ((curve_id < 1) || (curve_id > 25)) return 0;
2389
2390         return nid_list[curve_id];
2391 }
2392 #endif