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  * In addition, Sun covenants to all licensees who provide a reciprocal
 121  * covenant with respect to their own patents if any, not to sue under
 122  * current and future patent claims necessarily infringed by the making,
 123  * using, practicing, selling, offering for sale and/or otherwise
 124  * disposing of the Contribution as delivered hereunder
 125  * (or portions thereof), provided that such covenant shall not apply:
 126  *  1) for code that a licensee deletes from the Contribution;
 127  *  2) separates from the Contribution; or
 128  *  3) for infringements caused by:
 129  *       i) the modification of the Contribution or
 130  *      ii) the combination of the  Contribution with other software or
 131  *          devices where such combination causes the infringement.
 132  *
 133  * ECC cipher suite support in OpenSSL originally written by
 134  * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories.
 135  *
 136  */
 137
 138 #include <stdio.h>
 139 #include "ssl_locl.h"
 140 #include "kssl_lcl.h"
 141 #include <openssl/buffer.h>
 142 #include <openssl/rand.h>
 143 #include <openssl/objects.h>
 144 #include <openssl/evp.h>
 145 #include <openssl/md5.h>
 146 #include "cryptlib.h"
 147
 148 static SSL_METHOD *ssl3_get_client_method(int ver);
 149 static int ssl3_client_hello(SSL *s);
 150 static int ssl3_get_server_hello(SSL *s);
 151 static int ssl3_get_certificate_request(SSL *s);
 152 static int ca_dn_cmp(const X509_NAME * const *a,const X509_NAME * const *b);
 153 static int ssl3_get_server_done(SSL *s);
 154 static int ssl3_send_client_verify(SSL *s);
 155 static int ssl3_send_client_certificate(SSL *s);
 156 static int ssl3_send_client_key_exchange(SSL *s);
 157 static int ssl3_get_key_exchange(SSL *s);
 158 static int ssl3_get_server_certificate(SSL *s);
 159 static int ssl3_check_cert_and_algorithm(SSL *s);
 160
 161 #ifndef OPENSSL_NO_ECDH
 162 static int curve_id2nid(int curve_id);
 163 int check_srvr_ecc_cert_and_alg(X509 *x, SSL_CIPHER *cs);
 164 #endif
 165
 166 static SSL_METHOD *ssl3_get_client_method(int ver)
 167         {
 168         if (ver == SSL3_VERSION)
 169                 return(SSLv3_client_method());
 170         else
 171                 return(NULL);
 172         }
 173
 174 SSL_METHOD *SSLv3_client_method(void)
 175         {
 176         static int init=1;
 177         static SSL_METHOD SSLv3_client_data;
 178
 179         if (init)
 180                 {
 181                 CRYPTO_w_lock(CRYPTO_LOCK_SSL_METHOD);
 182
 183                 memcpy((char *)&SSLv3_client_data,(char *)sslv3_base_method(),
 184                         sizeof(SSL_METHOD));
 185                 SSLv3_client_data.ssl_connect=ssl3_connect;
 186                 SSLv3_client_data.get_ssl_method=ssl3_get_client_method;
 187                 init=0;
 188
 189                 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_METHOD);
 190                 }
 191         return(&SSLv3_client_data);
 192         }
 193
 194 int ssl3_connect(SSL *s)
 195         {
 196         BUF_MEM *buf;
 197         unsigned long Time=time(NULL),l;
 198         long num1;
 199         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 200         int ret= -1;
 201         int new_state,state,skip=0;;
 202
 203         RAND_add(&Time,sizeof(Time),0);
 204         ERR_clear_error();
 205         clear_sys_error();
 206
 207         if (s->info_callback != NULL)
 208                 cb=s->info_callback;
 209         else if (s->ctx->info_callback != NULL)
 210                 cb=s->ctx->info_callback;
 211
 212         s->in_handshake++;
 213         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 214
 215         for (;;)
 216                 {
 217                 state=s->state;
 218
 219                 switch(s->state)
 220                         {
 221                 case SSL_ST_RENEGOTIATE:
 222                         s->new_session=1;
 223                         s->state=SSL_ST_CONNECT;
 224                         s->ctx->stats.sess_connect_renegotiate++;
 225                         /* break */
 226                 case SSL_ST_BEFORE:
 227                 case SSL_ST_CONNECT:
 228                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 229                 case SSL_ST_OK|SSL_ST_CONNECT:
 230
 231                         s->server=0;
 232                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 233
 234                         if ((s->version & 0xff00 ) != 0x0300)
 235                                 {
 236                                 SSLerr(SSL_F_SSL3_CONNECT, ERR_R_INTERNAL_ERROR);
 237                                 ret = -1;
 238                                 goto end;
 239                                 }
 240
 241                         /* s->version=SSL3_VERSION; */
 242                         s->type=SSL_ST_CONNECT;
 243
 244                         if (s->init_buf == NULL)
 245                                 {
 246                                 if ((buf=BUF_MEM_new()) == NULL)
 247                                         {
 248                                         ret= -1;
 249                                         goto end;
 250                                         }
 251                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 252                                         {
 253                                         ret= -1;
 254                                         goto end;
 255                                         }
 256                                 s->init_buf=buf;
 257                                 }
 258
 259                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
 260
 261                         /* setup buffing BIO */
 262                         if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
 263
 264                         /* don't push the buffering BIO quite yet */
 265
 266                         ssl3_init_finished_mac(s);
 267
 268                         s->state=SSL3_ST_CW_CLNT_HELLO_A;
 269                         s->ctx->stats.sess_connect++;
 270                         s->init_num=0;
 271                         break;
 272
 273                 case SSL3_ST_CW_CLNT_HELLO_A:
 274                 case SSL3_ST_CW_CLNT_HELLO_B:
 275
 276                         s->shutdown=0;
 277                         ret=ssl3_client_hello(s);
 278                         if (ret <= 0) goto end;
 279                         s->state=SSL3_ST_CR_SRVR_HELLO_A;
 280                         s->init_num=0;
 281
 282                         /* turn on buffering for the next lot of output */
 283                         if (s->bbio != s->wbio)
 284                                 s->wbio=BIO_push(s->bbio,s->wbio);
 285
 286                         break;
 287
 288                 case SSL3_ST_CR_SRVR_HELLO_A:
 289                 case SSL3_ST_CR_SRVR_HELLO_B:
 290                         ret=ssl3_get_server_hello(s);
 291                         if (ret <= 0) goto end;
 292                         if (s->hit)
 293                                 s->state=SSL3_ST_CR_FINISHED_A;
 294                         else
 295                                 s->state=SSL3_ST_CR_CERT_A;
 296                         s->init_num=0;
 297                         break;
 298
 299                 case SSL3_ST_CR_CERT_A:
 300                 case SSL3_ST_CR_CERT_B:
 301                         /* Check if it is anon DH/ECDH */
 302                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 303                                 {
 304                                 ret=ssl3_get_server_certificate(s);
 305                                 if (ret <= 0) goto end;
 306                                 }
 307                         else
 308                                 skip=1;
 309                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 310                         s->init_num=0;
 311                         break;
 312
 313                 case SSL3_ST_CR_KEY_EXCH_A:
 314                 case SSL3_ST_CR_KEY_EXCH_B:
 315                         ret=ssl3_get_key_exchange(s);
 316                         if (ret <= 0) goto end;
 317                         s->state=SSL3_ST_CR_CERT_REQ_A;
 318                         s->init_num=0;
 319
 320                         /* at this point we check that we have the
 321                          * required stuff from the server */
 322                         if (!ssl3_check_cert_and_algorithm(s))
 323                                 {
 324                                 ret= -1;
 325                                 goto end;
 326                                 }
 327                         break;
 328
 329                 case SSL3_ST_CR_CERT_REQ_A:
 330                 case SSL3_ST_CR_CERT_REQ_B:
 331                         ret=ssl3_get_certificate_request(s);
 332                         if (ret <= 0) goto end;
 333                         s->state=SSL3_ST_CR_SRVR_DONE_A;
 334                         s->init_num=0;
 335                         break;
 336
 337                 case SSL3_ST_CR_SRVR_DONE_A:
 338                 case SSL3_ST_CR_SRVR_DONE_B:
 339                         ret=ssl3_get_server_done(s);
 340                         if (ret <= 0) goto end;
 341                         if (s->s3->tmp.cert_req)
 342                                 s->state=SSL3_ST_CW_CERT_A;
 343                         else
 344                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
 345                         s->init_num=0;
 346
 347                         break;
 348
 349                 case SSL3_ST_CW_CERT_A:
 350                 case SSL3_ST_CW_CERT_B:
 351                 case SSL3_ST_CW_CERT_C:
 352                 case SSL3_ST_CW_CERT_D:
 353                         ret=ssl3_send_client_certificate(s);
 354                         if (ret <= 0) goto end;
 355                         s->state=SSL3_ST_CW_KEY_EXCH_A;
 356                         s->init_num=0;
 357                         break;
 358
 359                 case SSL3_ST_CW_KEY_EXCH_A:
 360                 case SSL3_ST_CW_KEY_EXCH_B:
 361                         ret=ssl3_send_client_key_exchange(s);
 362                         if (ret <= 0) goto end;
 363                         l=s->s3->tmp.new_cipher->algorithms;
 364                         /* EAY EAY EAY need to check for DH fix cert
 365                          * sent back */
 366                         /* For TLS, cert_req is set to 2, so a cert chain
 367                          * of nothing is sent, but no verify packet is sent */
 368                         /* XXX: For now, we do not support client
 369                          * authentication in ECDH cipher suites with
 370                          * ECDH (rather than ECDSA) certificates.
 371                          * We need to skip the certificate verify
 372                          * message when client's ECDH public key is sent
 373                          * inside the client certificate.
 374                          */
 375                         if (s->s3->tmp.cert_req == 1)
 376                                 {
 377                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
 378                                 }
 379                         else
 380                                 {
 381                                 s->state=SSL3_ST_CW_CHANGE_A;
 382                                 s->s3->change_cipher_spec=0;
 383                                 }
 384
 385                         s->init_num=0;
 386                         break;
 387
 388                 case SSL3_ST_CW_CERT_VRFY_A:
 389                 case SSL3_ST_CW_CERT_VRFY_B:
 390                         ret=ssl3_send_client_verify(s);
 391                         if (ret <= 0) goto end;
 392                         s->state=SSL3_ST_CW_CHANGE_A;
 393                         s->init_num=0;
 394                         s->s3->change_cipher_spec=0;
 395                         break;
 396
 397                 case SSL3_ST_CW_CHANGE_A:
 398                 case SSL3_ST_CW_CHANGE_B:
 399                         ret=ssl3_send_change_cipher_spec(s,
 400                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
 401                         if (ret <= 0) goto end;
 402                         s->state=SSL3_ST_CW_FINISHED_A;
 403                         s->init_num=0;
 404
 405                         s->session->cipher=s->s3->tmp.new_cipher;
 406                         if (s->s3->tmp.new_compression == NULL)
 407                                 s->session->compress_meth=0;
 408                         else
 409                                 s->session->compress_meth=
 410                                         s->s3->tmp.new_compression->id;
 411                         if (!s->method->ssl3_enc->setup_key_block(s))
 412                                 {
 413                                 ret= -1;
 414                                 goto end;
 415                                 }
 416
 417                         if (!s->method->ssl3_enc->change_cipher_state(s,
 418                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 419                                 {
 420                                 ret= -1;
 421                                 goto end;
 422                                 }
 423
 424                         break;
 425
 426                 case SSL3_ST_CW_FINISHED_A:
 427                 case SSL3_ST_CW_FINISHED_B:
 428                         ret=ssl3_send_finished(s,
 429                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
 430                                 s->method->ssl3_enc->client_finished_label,
 431                                 s->method->ssl3_enc->client_finished_label_len);
 432                         if (ret <= 0) goto end;
 433                         s->state=SSL3_ST_CW_FLUSH;
 434
 435                         /* clear flags */
 436                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
 437                         if (s->hit)
 438                                 {
 439                                 s->s3->tmp.next_state=SSL_ST_OK;
 440                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
 441                                         {
 442                                         s->state=SSL_ST_OK;
 443                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
 444                                         s->s3->delay_buf_pop_ret=0;
 445                                         }
 446                                 }
 447                         else
 448                                 {
 449                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
 450                                 }
 451                         s->init_num=0;
 452                         break;
 453
 454                 case SSL3_ST_CR_FINISHED_A:
 455                 case SSL3_ST_CR_FINISHED_B:
 456
 457                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
 458                                 SSL3_ST_CR_FINISHED_B);
 459                         if (ret <= 0) goto end;
 460
 461                         if (s->hit)
 462                                 s->state=SSL3_ST_CW_CHANGE_A;
 463                         else
 464                                 s->state=SSL_ST_OK;
 465                         s->init_num=0;
 466                         break;
 467
 468                 case SSL3_ST_CW_FLUSH:
 469                         /* number of bytes to be flushed */
 470                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 471                         if (num1 > 0)
 472                                 {
 473                                 s->rwstate=SSL_WRITING;
 474                                 num1=BIO_flush(s->wbio);
 475                                 if (num1 <= 0) { ret= -1; goto end; }
 476                                 s->rwstate=SSL_NOTHING;
 477                                 }
 478
 479                         s->state=s->s3->tmp.next_state;
 480                         break;
 481
 482                 case SSL_ST_OK:
 483                         /* clean a few things up */
 484                         ssl3_cleanup_key_block(s);
 485
 486                         if (s->init_buf != NULL)
 487                                 {
 488                                 BUF_MEM_free(s->init_buf);
 489                                 s->init_buf=NULL;
 490                                 }
 491
 492                         /* If we are not 'joining' the last two packets,
 493                          * remove the buffering now */
 494                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 495                                 ssl_free_wbio_buffer(s);
 496                         /* else do it later in ssl3_write */
 497
 498                         s->init_num=0;
 499                         s->new_session=0;
 500
 501                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 502                         if (s->hit) s->ctx->stats.sess_hit++;
 503
 504                         ret=1;
 505                         /* s->server=0; */
 506                         s->handshake_func=ssl3_connect;
 507                         s->ctx->stats.sess_connect_good++;
 508
 509                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 510
 511                         goto end;
 512                         /* break; */
 513
 514                 default:
 515                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_UNKNOWN_STATE);
 516                         ret= -1;
 517                         goto end;
 518                         /* break; */
 519                         }
 520
 521                 /* did we do anything */
 522                 if (!s->s3->tmp.reuse_message && !skip)
 523                         {
 524                         if (s->debug)
 525                                 {
 526                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 527                                         goto end;
 528                                 }
 529
 530                         if ((cb != NULL) && (s->state != state))
 531                                 {
 532                                 new_state=s->state;
 533                                 s->state=state;
 534                                 cb(s,SSL_CB_CONNECT_LOOP,1);
 535                                 s->state=new_state;
 536                                 }
 537                         }
 538                 skip=0;
 539                 }
 540 end:
 541         s->in_handshake--;
 542         if (cb != NULL)
 543                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 544         return(ret);
 545         }
 546
 547
 548 static int ssl3_client_hello(SSL *s)
 549         {
 550         unsigned char *buf;
 551         unsigned char *p,*d;
 552         int i,j;
 553         unsigned long Time,l;
 554         SSL_COMP *comp;
 555
 556         buf=(unsigned char *)s->init_buf->data;
 557         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
 558                 {
 559                 if ((s->session == NULL) ||
 560                         (s->session->ssl_version != s->version) ||
 561                         (s->session->not_resumable))
 562                         {
 563                         if (!ssl_get_new_session(s,0))
 564                                 goto err;
 565                         }
 566                 /* else use the pre-loaded session */
 567
 568                 p=s->s3->client_random;
 569                 Time=time(NULL);                        /* Time */
 570                 l2n(Time,p);
 571                 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
 572
 573                 /* Do the message type and length last */
 574                 d=p= &(buf[4]);
 575
 576                 *(p++)=s->version>>8;
 577                 *(p++)=s->version&0xff;
 578                 s->client_version=s->version;
 579
 580                 /* Random stuff */
 581                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 582                 p+=SSL3_RANDOM_SIZE;
 583
 584                 /* Session ID */
 585                 if (s->new_session)
 586                         i=0;
 587                 else
 588                         i=s->session->session_id_length;
 589                 *(p++)=i;
 590                 if (i != 0)
 591                         {
 592                         if (i > sizeof s->session->session_id)
 593                                 {
 594                                 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 595                                 goto err;
 596                                 }
 597                         memcpy(p,s->session->session_id,i);
 598                         p+=i;
 599                         }
 600
 601                 /* Ciphers supported */
 602                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]));
 603                 if (i == 0)
 604                         {
 605                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 606                         goto err;
 607                         }
 608                 s2n(i,p);
 609                 p+=i;
 610
 611                 /* COMPRESSION */
 612                 if (s->ctx->comp_methods == NULL)
 613                         j=0;
 614                 else
 615                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
 616                 *(p++)=1+j;
 617                 for (i=0; i<j; i++)
 618                         {
 619                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
 620                         *(p++)=comp->id;
 621                         }
 622                 *(p++)=0; /* Add the NULL method */
 623
 624                 l=(p-d);
 625                 d=buf;
 626                 *(d++)=SSL3_MT_CLIENT_HELLO;
 627                 l2n3(l,d);
 628
 629                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 630                 /* number of bytes to write */
 631                 s->init_num=p-buf;
 632                 s->init_off=0;
 633                 }
 634
 635         /* SSL3_ST_CW_CLNT_HELLO_B */
 636         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 637 err:
 638         return(-1);
 639         }
 640
 641 static int ssl3_get_server_hello(SSL *s)
 642         {
 643         STACK_OF(SSL_CIPHER) *sk;
 644         SSL_CIPHER *c;
 645         unsigned char *p,*d;
 646         int i,al,ok;
 647         unsigned int j;
 648         long n;
 649         SSL_COMP *comp;
 650
 651         n=ssl3_get_message(s,
 652                 SSL3_ST_CR_SRVR_HELLO_A,
 653                 SSL3_ST_CR_SRVR_HELLO_B,
 654                 SSL3_MT_SERVER_HELLO,
 655                 300, /* ?? */
 656                 &ok);
 657
 658         if (!ok) return((int)n);
 659         d=p=(unsigned char *)s->init_msg;
 660
 661         if ((p[0] != (s->version>>8)) || (p[1] != (s->version&0xff)))
 662                 {
 663                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
 664                 s->version=(s->version&0xff00)|p[1];
 665                 al=SSL_AD_PROTOCOL_VERSION;
 666                 goto f_err;
 667                 }
 668         p+=2;
 669
 670         /* load the server hello data */
 671         /* load the server random */
 672         memcpy(s->s3->server_random,p,SSL3_RANDOM_SIZE);
 673         p+=SSL3_RANDOM_SIZE;
 674
 675         /* get the session-id */
 676         j= *(p++);
 677
 678         if ((j > sizeof s->session->session_id) || (j > SSL3_SESSION_ID_SIZE))
 679                 {
 680                 al=SSL_AD_ILLEGAL_PARAMETER;
 681                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_LONG);
 682                 goto f_err;
 683                 }
 684         if (j != 0 && j == s->session->session_id_length
 685             && memcmp(p,s->session->session_id,j) == 0)
 686             {
 687             if(s->sid_ctx_length != s->session->sid_ctx_length
 688                || memcmp(s->session->sid_ctx,s->sid_ctx,s->sid_ctx_length))
 689                 {
 690                 /* actually a client application bug */
 691                 al=SSL_AD_ILLEGAL_PARAMETER;
 692                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
 693                 goto f_err;
 694                 }
 695             s->hit=1;
 696             }
 697         else    /* a miss or crap from the other end */
 698                 {
 699                 /* If we were trying for session-id reuse, make a new
 700                  * SSL_SESSION so we don't stuff up other people */
 701                 s->hit=0;
 702                 if (s->session->session_id_length > 0)
 703                         {
 704                         if (!ssl_get_new_session(s,0))
 705                                 {
 706                                 al=SSL_AD_INTERNAL_ERROR;
 707                                 goto f_err;
 708                                 }
 709                         }
 710                 s->session->session_id_length=j;
 711                 memcpy(s->session->session_id,p,j); /* j could be 0 */
 712                 }
 713         p+=j;
 714         c=ssl_get_cipher_by_char(s,p);
 715         if (c == NULL)
 716                 {
 717                 /* unknown cipher */
 718                 al=SSL_AD_ILLEGAL_PARAMETER;
 719                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNKNOWN_CIPHER_RETURNED);
 720                 goto f_err;
 721                 }
 722         p+=ssl_put_cipher_by_char(s,NULL,NULL);
 723
 724         sk=ssl_get_ciphers_by_id(s);
 725         i=sk_SSL_CIPHER_find(sk,c);
 726         if (i < 0)
 727                 {
 728                 /* we did not say we would use this cipher */
 729                 al=SSL_AD_ILLEGAL_PARAMETER;
 730                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
 731                 goto f_err;
 732                 }
 733
 734         if (s->hit && (s->session->cipher != c))
 735                 {
 736                 if (!(s->options &
 737                         SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
 738                         {
 739                         al=SSL_AD_ILLEGAL_PARAMETER;
 740                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
 741                         goto f_err;
 742                         }
 743                 }
 744         s->s3->tmp.new_cipher=c;
 745
 746         /* lets get the compression algorithm */
 747         /* COMPRESSION */
 748         j= *(p++);
 749         if (j == 0)
 750                 comp=NULL;
 751         else
 752                 comp=ssl3_comp_find(s->ctx->comp_methods,j);
 753
 754         if ((j != 0) && (comp == NULL))
 755                 {
 756                 al=SSL_AD_ILLEGAL_PARAMETER;
 757                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
 758                 goto f_err;
 759                 }
 760         else
 761                 {
 762                 s->s3->tmp.new_compression=comp;
 763                 }
 764
 765         if (p != (d+n))
 766                 {
 767                 /* wrong packet length */
 768                 al=SSL_AD_DECODE_ERROR;
 769                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
 770                 goto err;
 771                 }
 772
 773         return(1);
 774 f_err:
 775         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 776 err:
 777         return(-1);
 778         }
 779
 780 static int ssl3_get_server_certificate(SSL *s)
 781         {
 782         int al,i,ok,ret= -1;
 783         unsigned long n,nc,llen,l;
 784         X509 *x=NULL;
 785         unsigned char *p,*d,*q;
 786         STACK_OF(X509) *sk=NULL;
 787         SESS_CERT *sc;
 788         EVP_PKEY *pkey=NULL;
 789         int need_cert = 1; /* VRS: 0=> will allow null cert if auth == KRB5 */
 790
 791         n=ssl3_get_message(s,
 792                 SSL3_ST_CR_CERT_A,
 793                 SSL3_ST_CR_CERT_B,
 794                 -1,
 795                 s->max_cert_list,
 796                 &ok);
 797
 798         if (!ok) return((int)n);
 799
 800         if (s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE)
 801                 {
 802                 s->s3->tmp.reuse_message=1;
 803                 return(1);
 804                 }
 805
 806         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
 807                 {
 808                 al=SSL_AD_UNEXPECTED_MESSAGE;
 809                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
 810                 goto f_err;
 811                 }
 812         d=p=(unsigned char *)s->init_msg;
 813
 814         if ((sk=sk_X509_new_null()) == NULL)
 815                 {
 816                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
 817                 goto err;
 818                 }
 819
 820         n2l3(p,llen);
 821         if (llen+3 != n)
 822                 {
 823                 al=SSL_AD_DECODE_ERROR;
 824                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
 825                 goto f_err;
 826                 }
 827         for (nc=0; nc<llen; )
 828                 {
 829                 n2l3(p,l);
 830                 if ((l+nc+3) > llen)
 831                         {
 832                         al=SSL_AD_DECODE_ERROR;
 833                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
 834                         goto f_err;
 835                         }
 836
 837                 q=p;
 838                 x=d2i_X509(NULL,&q,l);
 839                 if (x == NULL)
 840                         {
 841                         al=SSL_AD_BAD_CERTIFICATE;
 842                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
 843                         goto f_err;
 844                         }
 845                 if (q != (p+l))
 846                         {
 847                         al=SSL_AD_DECODE_ERROR;
 848                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
 849                         goto f_err;
 850                         }
 851                 if (!sk_X509_push(sk,x))
 852                         {
 853                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
 854                         goto err;
 855                         }
 856                 x=NULL;
 857                 nc+=l+3;
 858                 p=q;
 859                 }
 860
 861         i=ssl_verify_cert_chain(s,sk);
 862         if ((s->verify_mode != SSL_VERIFY_NONE) && (!i)
 863 #ifndef OPENSSL_NO_KRB5
 864                 && (s->s3->tmp.new_cipher->algorithms & (SSL_MKEY_MASK|SSL_AUTH_MASK))
 865                 != (SSL_aKRB5|SSL_kKRB5)
 866 #endif /* OPENSSL_NO_KRB5 */
 867                 )
 868                 {
 869                 al=ssl_verify_alarm_type(s->verify_result);
 870                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
 871                 goto f_err;
 872                 }
 873         ERR_clear_error(); /* but we keep s->verify_result */
 874
 875         sc=ssl_sess_cert_new();
 876         if (sc == NULL) goto err;
 877
 878         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
 879         s->session->sess_cert=sc;
 880
 881         sc->cert_chain=sk;
 882         /* Inconsistency alert: cert_chain does include the peer's
 883          * certificate, which we don't include in s3_srvr.c */
 884         x=sk_X509_value(sk,0);
 885         sk=NULL;
 886         /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/
 887
 888         pkey=X509_get_pubkey(x);
 889
 890         /* VRS: allow null cert if auth == KRB5 */
 891         need_cert =     ((s->s3->tmp.new_cipher->algorithms
 892                         & (SSL_MKEY_MASK|SSL_AUTH_MASK))
 893                         == (SSL_aKRB5|SSL_kKRB5))? 0: 1;
 894
 895 #ifdef KSSL_DEBUG
 896         printf("pkey,x = %p, %p\n", pkey,x);
 897         printf("ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x,pkey));
 898         printf("cipher, alg, nc = %s, %lx, %d\n", s->s3->tmp.new_cipher->name,
 899                 s->s3->tmp.new_cipher->algorithms, need_cert);
 900 #endif    /* KSSL_DEBUG */
 901
 902         if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey)))
 903                 {
 904                 x=NULL;
 905                 al=SSL3_AL_FATAL;
 906                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
 907                         SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
 908                 goto f_err;
 909                 }
 910
 911         i=ssl_cert_type(x,pkey);
 912         if (need_cert && i < 0)
 913                 {
 914                 x=NULL;
 915                 al=SSL3_AL_FATAL;
 916                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
 917                         SSL_R_UNKNOWN_CERTIFICATE_TYPE);
 918                 goto f_err;
 919                 }
 920
 921         if (need_cert)
 922                 {
 923                 sc->peer_cert_type=i;
 924                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
 925                 /* Why would the following ever happen?
 926                  * We just created sc a couple of lines ago. */
 927                 if (sc->peer_pkeys[i].x509 != NULL)
 928                         X509_free(sc->peer_pkeys[i].x509);
 929                 sc->peer_pkeys[i].x509=x;
 930                 sc->peer_key= &(sc->peer_pkeys[i]);
 931
 932                 if (s->session->peer != NULL)
 933                         X509_free(s->session->peer);
 934                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
 935                 s->session->peer=x;
 936                 }
 937         else
 938                 {
 939                 sc->peer_cert_type=i;
 940                 sc->peer_key= NULL;
 941
 942                 if (s->session->peer != NULL)
 943                         X509_free(s->session->peer);
 944                 s->session->peer=NULL;
 945                 }
 946         s->session->verify_result = s->verify_result;
 947
 948         x=NULL;
 949         ret=1;
 950
 951         if (0)
 952                 {
 953 f_err:
 954                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
 955                 }
 956 err:
 957         EVP_PKEY_free(pkey);
 958         X509_free(x);
 959         sk_X509_pop_free(sk,X509_free);
 960         return(ret);
 961         }
 962
 963 static int ssl3_get_key_exchange(SSL *s)
 964         {
 965 #ifndef OPENSSL_NO_RSA
 966         unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
 967 #endif
 968         EVP_MD_CTX md_ctx;
 969         unsigned char *param,*p;
 970         int al,i,j,param_len,ok;
 971         long n,alg;
 972         EVP_PKEY *pkey=NULL;
 973 #ifndef OPENSSL_NO_RSA
 974         RSA *rsa=NULL;
 975 #endif
 976 #ifndef OPENSSL_NO_DH
 977         DH *dh=NULL;
 978 #endif
 979 #ifndef OPENSSL_NO_ECDH
 980         EC_KEY *ecdh = NULL;
 981         BN_CTX *bn_ctx = NULL;
 982         EC_POINT *srvr_ecpoint = NULL;
 983         int curve_nid = 0;
 984         int encoded_pt_len = 0;
 985 #endif
 986
 987         /* use same message size as in ssl3_get_certificate_request()
 988          * as ServerKeyExchange message may be skipped */
 989         n=ssl3_get_message(s,
 990                 SSL3_ST_CR_KEY_EXCH_A,
 991                 SSL3_ST_CR_KEY_EXCH_B,
 992                 -1,
 993                 s->max_cert_list,
 994                 &ok);
 995
 996         if (!ok) return((int)n);
 997
 998         if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
 999                 {
1000                 s->s3->tmp.reuse_message=1;
1001                 return(1);
1002                 }
1003
1004         param=p=(unsigned char *)s->init_msg;
1005
1006         if (s->session->sess_cert != NULL)
1007                 {
1008 #ifndef OPENSSL_NO_RSA
1009                 if (s->session->sess_cert->peer_rsa_tmp != NULL)
1010                         {
1011                         RSA_free(s->session->sess_cert->peer_rsa_tmp);
1012                         s->session->sess_cert->peer_rsa_tmp=NULL;
1013                         }
1014 #endif
1015 #ifndef OPENSSL_NO_DH
1016                 if (s->session->sess_cert->peer_dh_tmp)
1017                         {
1018                         DH_free(s->session->sess_cert->peer_dh_tmp);
1019                         s->session->sess_cert->peer_dh_tmp=NULL;
1020                         }
1021 #endif
1022 #ifndef OPENSSL_NO_ECDH
1023                 if (s->session->sess_cert->peer_ecdh_tmp)
1024                         {
1025                         EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp);
1026                         s->session->sess_cert->peer_ecdh_tmp=NULL;
1027                         }
1028 #endif
1029                 }
1030         else
1031                 {
1032                 s->session->sess_cert=ssl_sess_cert_new();
1033                 }
1034
1035         param_len=0;
1036         alg=s->s3->tmp.new_cipher->algorithms;
1037         EVP_MD_CTX_init(&md_ctx);
1038
1039 #ifndef OPENSSL_NO_RSA
1040         if (alg & SSL_kRSA)
1041                 {
1042                 if ((rsa=RSA_new()) == NULL)
1043                         {
1044                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1045                         goto err;
1046                         }
1047                 n2s(p,i);
1048                 param_len=i+2;
1049                 if (param_len > n)
1050                         {
1051                         al=SSL_AD_DECODE_ERROR;
1052                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
1053                         goto f_err;
1054                         }
1055                 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
1056                         {
1057                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1058                         goto err;
1059                         }
1060                 p+=i;
1061
1062                 n2s(p,i);
1063                 param_len+=i+2;
1064                 if (param_len > n)
1065                         {
1066                         al=SSL_AD_DECODE_ERROR;
1067                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
1068                         goto f_err;
1069                         }
1070                 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
1071                         {
1072                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1073                         goto err;
1074                         }
1075                 p+=i;
1076                 n-=param_len;
1077
1078                 /* this should be because we are using an export cipher */
1079                 if (alg & SSL_aRSA)
1080                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1081                 else
1082                         {
1083                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1084                         goto err;
1085                         }
1086                 s->session->sess_cert->peer_rsa_tmp=rsa;
1087                 rsa=NULL;
1088                 }
1089 #else /* OPENSSL_NO_RSA */
1090         if (0)
1091                 ;
1092 #endif
1093 #ifndef OPENSSL_NO_DH
1094         else if (alg & SSL_kEDH)
1095                 {
1096                 if ((dh=DH_new()) == NULL)
1097                         {
1098                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
1099                         goto err;
1100                         }
1101                 n2s(p,i);
1102                 param_len=i+2;
1103                 if (param_len > n)
1104                         {
1105                         al=SSL_AD_DECODE_ERROR;
1106                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
1107                         goto f_err;
1108                         }
1109                 if (!(dh->p=BN_bin2bn(p,i,NULL)))
1110                         {
1111                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1112                         goto err;
1113                         }
1114                 p+=i;
1115
1116                 n2s(p,i);
1117                 param_len+=i+2;
1118                 if (param_len > n)
1119                         {
1120                         al=SSL_AD_DECODE_ERROR;
1121                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
1122                         goto f_err;
1123                         }
1124                 if (!(dh->g=BN_bin2bn(p,i,NULL)))
1125                         {
1126                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1127                         goto err;
1128                         }
1129                 p+=i;
1130
1131                 n2s(p,i);
1132                 param_len+=i+2;
1133                 if (param_len > n)
1134                         {
1135                         al=SSL_AD_DECODE_ERROR;
1136                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
1137                         goto f_err;
1138                         }
1139                 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
1140                         {
1141                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1142                         goto err;
1143                         }
1144                 p+=i;
1145                 n-=param_len;
1146
1147 #ifndef OPENSSL_NO_RSA
1148                 if (alg & SSL_aRSA)
1149                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1150 #else
1151                 if (0)
1152                         ;
1153 #endif
1154 #ifndef OPENSSL_NO_DSA
1155                 else if (alg & SSL_aDSS)
1156                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1157 #endif
1158                 /* else anonymous DH, so no certificate or pkey. */
1159
1160                 s->session->sess_cert->peer_dh_tmp=dh;
1161                 dh=NULL;
1162                 }
1163         else if ((alg & SSL_kDHr) || (alg & SSL_kDHd))
1164                 {
1165                 al=SSL_AD_ILLEGAL_PARAMETER;
1166                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1167                 goto f_err;
1168                 }
1169 #endif /* !OPENSSL_NO_DH */
1170
1171 #ifndef OPENSSL_NO_ECDH
1172         else if (alg & SSL_kECDHE)
1173                 {
1174                 if ((ecdh=EC_KEY_new()) == NULL)
1175                         {
1176                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1177                         goto err;
1178                         }
1179
1180                 /* Extract elliptic curve parameters and the
1181                  * server's ephemeral ECDH public key.
1182                  * Keep accumulating lengths of various components in
1183                  * param_len and make sure it never exceeds n.
1184                  */
1185
1186                 /* XXX: For now we only support named (not generic) curves
1187                  * and the ECParameters in this case is just two bytes.
1188                  */
1189                 param_len=2;
1190                 if ((param_len > n) ||
1191                     (*p != NAMED_CURVE_TYPE) ||
1192                     ((curve_nid = curve_id2nid(*(p + 1))) == 0))
1193                         {
1194                         al=SSL_AD_INTERNAL_ERROR;
1195                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
1196                         goto f_err;
1197                         }
1198
1199                 if (!(ecdh->group=EC_GROUP_new_by_nid(curve_nid)))
1200                         {
1201                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1202                         goto err;
1203                         }
1204
1205                 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1206                     (EC_GROUP_get_degree(ecdh->group) > 163))
1207                         {
1208                         al=SSL_AD_EXPORT_RESTRICTION;
1209                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1210                         goto f_err;
1211                         }
1212
1213                 p+=2;
1214
1215                 /* Next, get the encoded ECPoint */
1216                 if (((srvr_ecpoint = EC_POINT_new(ecdh->group)) == NULL) ||
1217                     ((bn_ctx = BN_CTX_new()) == NULL))
1218                         {
1219                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1220                         goto err;
1221                         }
1222
1223                 encoded_pt_len = *p;  /* length of encoded point */
1224                 p+=1;
1225                 param_len += (1 + encoded_pt_len);
1226                 if ((param_len > n) ||
1227                     (EC_POINT_oct2point(ecdh->group, srvr_ecpoint,
1228                         p, encoded_pt_len, bn_ctx) == 0))
1229                         {
1230                         al=SSL_AD_DECODE_ERROR;
1231                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_ECPOINT);
1232                         goto f_err;
1233                         }
1234
1235                 n-=param_len;
1236                 p+=encoded_pt_len;
1237
1238                 /* The ECC/TLS specification does not mention
1239                  * the use of DSA to sign ECParameters in the server
1240                  * key exchange message. We do support RSA and ECDSA.
1241                  */
1242                 if (0) ;
1243 #ifndef OPENSSL_NO_RSA
1244                 else if (alg & SSL_aRSA)
1245                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1246 #endif
1247 #ifndef OPENSSL_NO_ECDSA
1248                 else if (alg & SSL_aECDSA)
1249                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1250 #endif
1251                 /* else anonymous ECDH, so no certificate or pkey. */
1252                 ecdh->pub_key = srvr_ecpoint;
1253                 s->session->sess_cert->peer_ecdh_tmp=ecdh;
1254                 ecdh=NULL;
1255                 BN_CTX_free(bn_ctx);
1256                 srvr_ecpoint = NULL;
1257                 }
1258         else if (alg & SSL_kECDH)
1259                 {
1260                 al=SSL_AD_UNEXPECTED_MESSAGE;
1261                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1262                 goto f_err;
1263                 }
1264 #endif /* !OPENSSL_NO_ECDH */
1265         if (alg & SSL_aFZA)
1266                 {
1267                 al=SSL_AD_HANDSHAKE_FAILURE;
1268                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1269                 goto f_err;
1270                 }
1271
1272
1273         /* p points to the next byte, there are 'n' bytes left */
1274
1275         /* if it was signed, check the signature */
1276         if (pkey != NULL)
1277                 {
1278                 n2s(p,i);
1279                 n-=2;
1280                 j=EVP_PKEY_size(pkey);
1281
1282                 if ((i != n) || (n > j) || (n <= 0))
1283                         {
1284                         /* wrong packet length */
1285                         al=SSL_AD_DECODE_ERROR;
1286                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1287                         goto f_err;
1288                         }
1289
1290 #ifndef OPENSSL_NO_RSA
1291                 if (pkey->type == EVP_PKEY_RSA)
1292                         {
1293                         int num;
1294
1295                         j=0;
1296                         q=md_buf;
1297                         for (num=2; num > 0; num--)
1298                                 {
1299                                 EVP_DigestInit_ex(&md_ctx,(num == 2)
1300                                         ?s->ctx->md5:s->ctx->sha1, NULL);
1301                                 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1302                                 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1303                                 EVP_DigestUpdate(&md_ctx,param,param_len);
1304                                 EVP_DigestFinal_ex(&md_ctx,q,(unsigned int *)&i);
1305                                 q+=i;
1306                                 j+=i;
1307                                 }
1308                         i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
1309                                                                 pkey->pkey.rsa);
1310                         if (i < 0)
1311                                 {
1312                                 al=SSL_AD_DECRYPT_ERROR;
1313                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1314                                 goto f_err;
1315                                 }
1316                         if (i == 0)
1317                                 {
1318                                 /* bad signature */
1319                                 al=SSL_AD_DECRYPT_ERROR;
1320                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1321                                 goto f_err;
1322                                 }
1323                         }
1324                 else
1325 #endif
1326 #ifndef OPENSSL_NO_DSA
1327                         if (pkey->type == EVP_PKEY_DSA)
1328                         {
1329                         /* lets do DSS */
1330                         EVP_VerifyInit_ex(&md_ctx,EVP_dss1(), NULL);
1331                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1332                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1333                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1334                         if (!EVP_VerifyFinal(&md_ctx,p,(int)n,pkey))
1335                                 {
1336                                 /* bad signature */
1337                                 al=SSL_AD_DECRYPT_ERROR;
1338                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1339                                 goto f_err;
1340                                 }
1341                         }
1342                 else
1343 #endif
1344 #ifndef OPENSSL_NO_ECDSA
1345                         if (pkey->type == EVP_PKEY_EC)
1346                         {
1347                         /* let's do ECDSA */
1348                         EVP_VerifyInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1349                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1350                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1351                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1352                         if (!EVP_VerifyFinal(&md_ctx,p,(int)n,pkey))
1353                                 {
1354                                 /* bad signature */
1355                                 al=SSL_AD_DECRYPT_ERROR;
1356                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1357                                 goto f_err;
1358                                 }
1359                         }
1360                 else
1361 #endif
1362                         {
1363                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1364                         goto err;
1365                         }
1366                 }
1367         else
1368                 {
1369                 /* still data left over */
1370                 if (!(alg & SSL_aNULL))
1371                         {
1372                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1373                         goto err;
1374                         }
1375                 if (n != 0)
1376                         {
1377                         al=SSL_AD_DECODE_ERROR;
1378                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
1379                         goto f_err;
1380                         }
1381                 }
1382         EVP_PKEY_free(pkey);
1383         EVP_MD_CTX_cleanup(&md_ctx);
1384         return(1);
1385 f_err:
1386         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1387 err:
1388         EVP_PKEY_free(pkey);
1389 #ifndef OPENSSL_NO_RSA
1390         if (rsa != NULL)
1391                 RSA_free(rsa);
1392 #endif
1393 #ifndef OPENSSL_NO_DH
1394         if (dh != NULL)
1395                 DH_free(dh);
1396 #endif
1397 #ifndef OPENSSL_NO_ECDH
1398         BN_CTX_free(bn_ctx);
1399         EC_POINT_free(srvr_ecpoint);
1400         if (ecdh != NULL)
1401                 EC_KEY_free(ecdh);
1402 #endif
1403         EVP_MD_CTX_cleanup(&md_ctx);
1404         return(-1);
1405         }
1406
1407 static int ssl3_get_certificate_request(SSL *s)
1408         {
1409         int ok,ret=0;
1410         unsigned long n,nc,l;
1411         unsigned int llen,ctype_num,i;
1412         X509_NAME *xn=NULL;
1413         unsigned char *p,*d,*q;
1414         STACK_OF(X509_NAME) *ca_sk=NULL;
1415
1416         n=ssl3_get_message(s,
1417                 SSL3_ST_CR_CERT_REQ_A,
1418                 SSL3_ST_CR_CERT_REQ_B,
1419                 -1,
1420                 s->max_cert_list,
1421                 &ok);
1422
1423         if (!ok) return((int)n);
1424
1425         s->s3->tmp.cert_req=0;
1426
1427         if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
1428                 {
1429                 s->s3->tmp.reuse_message=1;
1430                 return(1);
1431                 }
1432
1433         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
1434                 {
1435                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1436                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
1437                 goto err;
1438                 }
1439
1440         /* TLS does not like anon-DH with client cert */
1441         if (s->version > SSL3_VERSION)
1442                 {
1443                 l=s->s3->tmp.new_cipher->algorithms;
1444                 if (l & SSL_aNULL)
1445                         {
1446                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1447                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
1448                         goto err;
1449                         }
1450                 }
1451
1452         d=p=(unsigned char *)s->init_msg;
1453
1454         if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
1455                 {
1456                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1457                 goto err;
1458                 }
1459
1460         /* get the certificate types */
1461         ctype_num= *(p++);
1462         if (ctype_num > SSL3_CT_NUMBER)
1463                 ctype_num=SSL3_CT_NUMBER;
1464         for (i=0; i<ctype_num; i++)
1465                 s->s3->tmp.ctype[i]= p[i];
1466         p+=ctype_num;
1467
1468         /* get the CA RDNs */
1469         n2s(p,llen);
1470 #if 0
1471 {
1472 FILE *out;
1473 out=fopen("/tmp/vsign.der","w");
1474 fwrite(p,1,llen,out);
1475 fclose(out);
1476 }
1477 #endif
1478
1479         if ((llen+ctype_num+2+1) != n)
1480                 {
1481                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1482                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
1483                 goto err;
1484                 }
1485
1486         for (nc=0; nc<llen; )
1487                 {
1488                 n2s(p,l);
1489                 if ((l+nc+2) > llen)
1490                         {
1491                         if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1492                                 goto cont; /* netscape bugs */
1493                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1494                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
1495                         goto err;
1496                         }
1497
1498                 q=p;
1499
1500                 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
1501                         {
1502                         /* If netscape tolerance is on, ignore errors */
1503                         if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
1504                                 goto cont;
1505                         else
1506                                 {
1507                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1508                                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
1509                                 goto err;
1510                                 }
1511                         }
1512
1513                 if (q != (p+l))
1514                         {
1515                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1516                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
1517                         goto err;
1518                         }
1519                 if (!sk_X509_NAME_push(ca_sk,xn))
1520                         {
1521                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1522                         goto err;
1523                         }
1524
1525                 p+=l;
1526                 nc+=l+2;
1527                 }
1528
1529         if (0)
1530                 {
1531 cont:
1532                 ERR_clear_error();
1533                 }
1534
1535         /* we should setup a certificate to return.... */
1536         s->s3->tmp.cert_req=1;
1537         s->s3->tmp.ctype_num=ctype_num;
1538         if (s->s3->tmp.ca_names != NULL)
1539                 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
1540         s->s3->tmp.ca_names=ca_sk;
1541         ca_sk=NULL;
1542
1543         ret=1;
1544 err:
1545         if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
1546         return(ret);
1547         }
1548
1549 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
1550         {
1551         return(X509_NAME_cmp(*a,*b));
1552         }
1553
1554 static int ssl3_get_server_done(SSL *s)
1555         {
1556         int ok,ret=0;
1557         long n;
1558
1559         n=ssl3_get_message(s,
1560                 SSL3_ST_CR_SRVR_DONE_A,
1561                 SSL3_ST_CR_SRVR_DONE_B,
1562                 SSL3_MT_SERVER_DONE,
1563                 30, /* should be very small, like 0 :-) */
1564                 &ok);
1565
1566         if (!ok) return((int)n);
1567         if (n > 0)
1568                 {
1569                 /* should contain no data */
1570                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1571                 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
1572                 return -1;
1573                 }
1574         ret=1;
1575         return(ret);
1576         }
1577
1578 static int ssl3_send_client_key_exchange(SSL *s)
1579         {
1580         unsigned char *p,*d;
1581         int n;
1582         unsigned long l;
1583 #ifndef OPENSSL_NO_RSA
1584         unsigned char *q;
1585         EVP_PKEY *pkey=NULL;
1586 #endif
1587 #ifndef OPENSSL_NO_KRB5
1588         KSSL_ERR kssl_err;
1589 #endif /* OPENSSL_NO_KRB5 */
1590 #ifndef OPENSSL_NO_ECDH
1591         EC_KEY *clnt_ecdh = NULL;
1592         EC_POINT *srvr_ecpoint = NULL;
1593         EVP_PKEY *srvr_pub_pkey = NULL;
1594         unsigned char *encodedPoint = NULL;
1595         int encoded_pt_len = 0;
1596         BN_CTX * bn_ctx = NULL;
1597 #endif
1598
1599         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
1600                 {
1601                 d=(unsigned char *)s->init_buf->data;
1602                 p= &(d[4]);
1603
1604                 l=s->s3->tmp.new_cipher->algorithms;
1605
1606                 /* Fool emacs indentation */
1607                 if (0) {}
1608 #ifndef OPENSSL_NO_RSA
1609                 else if (l & SSL_kRSA)
1610                         {
1611                         RSA *rsa;
1612                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1613
1614                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
1615                                 rsa=s->session->sess_cert->peer_rsa_tmp;
1616                         else
1617                                 {
1618                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1619                                 if ((pkey == NULL) ||
1620                                         (pkey->type != EVP_PKEY_RSA) ||
1621                                         (pkey->pkey.rsa == NULL))
1622                                         {
1623                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1624                                         goto err;
1625                                         }
1626                                 rsa=pkey->pkey.rsa;
1627                                 EVP_PKEY_free(pkey);
1628                                 }
1629
1630                         tmp_buf[0]=s->client_version>>8;
1631                         tmp_buf[1]=s->client_version&0xff;
1632                         if (RAND_bytes(&(tmp_buf[2]),SSL_MAX_MASTER_KEY_LENGTH-2) <= 0)
1633                                         goto err;
1634
1635                         s->session->master_key_length=SSL_MAX_MASTER_KEY_LENGTH;
1636
1637                         q=p;
1638                         /* Fix buf for TLS and beyond */
1639                         if (s->version > SSL3_VERSION)
1640                                 p+=2;
1641                         n=RSA_public_encrypt(SSL_MAX_MASTER_KEY_LENGTH,
1642                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
1643 #ifdef PKCS1_CHECK
1644                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
1645                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
1646 #endif
1647                         if (n <= 0)
1648                                 {
1649                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
1650                                 goto err;
1651                                 }
1652
1653                         /* Fix buf for TLS and beyond */
1654                         if (s->version > SSL3_VERSION)
1655                                 {
1656                                 s2n(n,q);
1657                                 n+=2;
1658                                 }
1659
1660                         s->session->master_key_length=
1661                                 s->method->ssl3_enc->generate_master_secret(s,
1662                                         s->session->master_key,
1663                                         tmp_buf,SSL_MAX_MASTER_KEY_LENGTH);
1664                         memset(tmp_buf,0,SSL_MAX_MASTER_KEY_LENGTH);
1665                         }
1666 #endif
1667 #ifndef OPENSSL_NO_KRB5
1668                 else if (l & SSL_kKRB5)
1669                         {
1670                         krb5_error_code krb5rc;
1671                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
1672                         /*  krb5_data   krb5_ap_req;  */
1673                         krb5_data       *enc_ticket;
1674                         krb5_data       authenticator, *authp = NULL;
1675                         EVP_CIPHER_CTX  ciph_ctx;
1676                         EVP_CIPHER      *enc = NULL;
1677                         unsigned char   iv[EVP_MAX_IV_LENGTH];
1678                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1679                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH
1680                                                 + EVP_MAX_IV_LENGTH];
1681                         int             padl, outl = sizeof(epms);
1682
1683                         EVP_CIPHER_CTX_init(&ciph_ctx);
1684
1685 #ifdef KSSL_DEBUG
1686                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
1687                                 l, SSL_kKRB5);
1688 #endif  /* KSSL_DEBUG */
1689
1690                         authp = NULL;
1691 #ifdef KRB5SENDAUTH
1692                         if (KRB5SENDAUTH)  authp = &authenticator;
1693 #endif  /* KRB5SENDAUTH */
1694
1695                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
1696                                 &kssl_err);
1697                         enc = kssl_map_enc(kssl_ctx->enctype);
1698                         if (enc == NULL)
1699                             goto err;
1700 #ifdef KSSL_DEBUG
1701                         {
1702                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
1703                         if (krb5rc && kssl_err.text)
1704                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
1705                         }
1706 #endif  /* KSSL_DEBUG */
1707
1708                         if (krb5rc)
1709                                 {
1710                                 ssl3_send_alert(s,SSL3_AL_FATAL,
1711                                                 SSL_AD_HANDSHAKE_FAILURE);
1712                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1713                                                 kssl_err.reason);
1714                                 goto err;
1715                                 }
1716
1717                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
1718                         **  in place of RFC 2712 KerberosWrapper, as in:
1719                         **
1720                         **  Send ticket (copy to *p, set n = length)
1721                         **  n = krb5_ap_req.length;
1722                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
1723                         **  if (krb5_ap_req.data)
1724                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
1725                         **
1726                         **  Now using real RFC 2712 KerberosWrapper
1727                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
1728                         **  Note: 2712 "opaque" types are here replaced
1729                         **  with a 2-byte length followed by the value.
1730                         **  Example:
1731                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
1732                         **  Where "xx xx" = length bytes.  Shown here with
1733                         **  optional authenticator omitted.
1734                         */
1735
1736                         /*  KerberosWrapper.Ticket              */
1737                         s2n(enc_ticket->length,p);
1738                         memcpy(p, enc_ticket->data, enc_ticket->length);
1739                         p+= enc_ticket->length;
1740                         n = enc_ticket->length + 2;
1741
1742                         /*  KerberosWrapper.Authenticator       */
1743                         if (authp  &&  authp->length)
1744                                 {
1745                                 s2n(authp->length,p);
1746                                 memcpy(p, authp->data, authp->length);
1747                                 p+= authp->length;
1748                                 n+= authp->length + 2;
1749
1750                                 free(authp->data);
1751                                 authp->data = NULL;
1752                                 authp->length = 0;
1753                                 }
1754                         else
1755                                 {
1756                                 s2n(0,p);/*  null authenticator length  */
1757                                 n+=2;
1758                                 }
1759
1760                         if (RAND_bytes(tmp_buf,SSL_MAX_MASTER_KEY_LENGTH) <= 0)
1761                             goto err;
1762
1763                         /*  20010420 VRS.  Tried it this way; failed.
1764                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
1765                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
1766                         **                              kssl_ctx->length);
1767                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
1768                         */
1769
1770                         memset(iv, 0, EVP_MAX_IV_LENGTH);  /* per RFC 1510 */
1771                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
1772                                 kssl_ctx->key,iv);
1773                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
1774                                 SSL_MAX_MASTER_KEY_LENGTH);
1775                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
1776                         outl += padl;
1777                         if (outl > sizeof epms)
1778                                 {
1779                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1780                                 goto err;
1781                                 }
1782                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
1783
1784                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
1785                         s2n(outl,p);
1786                         memcpy(p, epms, outl);
1787                         p+=outl;
1788                         n+=outl + 2;
1789
1790                         s->session->master_key_length=
1791                                 s->method->ssl3_enc->generate_master_secret(s,
1792                                         s->session->master_key,
1793                                         tmp_buf, SSL_MAX_MASTER_KEY_LENGTH);
1794
1795                         memset(tmp_buf, 0, SSL_MAX_MASTER_KEY_LENGTH);
1796                         memset(epms, 0, outl);
1797                         }
1798 #endif
1799 #ifndef OPENSSL_NO_DH
1800                 else if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1801                         {
1802                         DH *dh_srvr,*dh_clnt;
1803
1804                         if (s->session->sess_cert->peer_dh_tmp != NULL)
1805                                 dh_srvr=s->session->sess_cert->peer_dh_tmp;
1806                         else
1807                                 {
1808                                 /* we get them from the cert */
1809                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1810                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
1811                                 goto err;
1812                                 }
1813
1814                         /* generate a new random key */
1815                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
1816                                 {
1817                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1818                                 goto err;
1819                                 }
1820                         if (!DH_generate_key(dh_clnt))
1821                                 {
1822                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1823                                 goto err;
1824                                 }
1825
1826                         /* use the 'p' output buffer for the DH key, but
1827                          * make sure to clear it out afterwards */
1828
1829                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
1830
1831                         if (n <= 0)
1832                                 {
1833                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1834                                 goto err;
1835                                 }
1836
1837                         /* generate master key from the result */
1838                         s->session->master_key_length=
1839                                 s->method->ssl3_enc->generate_master_secret(s,
1840                                         s->session->master_key,p,n);
1841                         /* clean up */
1842                         memset(p,0,n);
1843
1844                         /* send off the data */
1845                         n=BN_num_bytes(dh_clnt->pub_key);
1846                         s2n(n,p);
1847                         BN_bn2bin(dh_clnt->pub_key,p);
1848                         n+=2;
1849
1850                         DH_free(dh_clnt);
1851
1852                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
1853                         }
1854 #endif
1855
1856 #ifndef OPENSSL_NO_ECDH
1857                 else if ((l & SSL_kECDH) || (l & SSL_kECDHE))
1858                         {
1859                         EC_GROUP *srvr_group = NULL;
1860                         int ecdh_clnt_cert = 0;
1861
1862                         /* Did we send out the client's
1863                          * ECDH share for use in premaster
1864                          * computation as part of client certificate?
1865                          * If so, set ecdh_clnt_cert to 1.
1866                          */
1867                         if ((l & SSL_kECDH) && (s->cert != NULL))
1868                                 {
1869                                 /* XXX: For now, we do not support client
1870                                  * authentication using ECDH certificates.
1871                                  * To add such support, one needs to add
1872                                  * code that checks for appropriate
1873                                  * conditions and sets ecdh_clnt_cert to 1.
1874                                  * For example, the cert have an ECC
1875                                  * key on the same curve as the server's
1876                                  * and the key should be authorized for
1877                                  * key agreement.
1878                                  *
1879                                  * One also needs to add code in ssl3_connect
1880                                  * to skip sending the certificate verify
1881                                  * message.
1882                                  *
1883                                  * if ((s->cert->key->privatekey != NULL) &&
1884                                  *     (s->cert->key->privatekey->type ==
1885                                  *      EVP_PKEY_EC) && ...)
1886                                  * ecdh_clnt_cert = 1;
1887                                  */
1888                                 }
1889
1890                         if (s->session->sess_cert->peer_ecdh_tmp != NULL)
1891                                 {
1892                                 srvr_group = s->session->sess_cert-> \
1893                                     peer_ecdh_tmp->group;
1894                                 srvr_ecpoint = s->session->sess_cert-> \
1895                                     peer_ecdh_tmp->pub_key;
1896                                 }
1897                         else
1898                                 {
1899                                 /* Get the Server Public Key from Cert */
1900                                 srvr_pub_pkey = X509_get_pubkey(s->session-> \
1901                                     sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1902                                 if ((srvr_pub_pkey == NULL) ||
1903                                     (srvr_pub_pkey->type != EVP_PKEY_EC) ||
1904                                     (srvr_pub_pkey->pkey.eckey == NULL))
1905                                         {
1906                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1907                                             ERR_R_INTERNAL_ERROR);
1908                                         goto err;
1909                                         }
1910
1911                                 srvr_group = srvr_pub_pkey->pkey.eckey->group;
1912                                 srvr_ecpoint =
1913                                     srvr_pub_pkey->pkey.eckey->pub_key;
1914                                 }
1915
1916                         if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
1917                                 {
1918                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1919                                     ERR_R_INTERNAL_ERROR);
1920                                 goto err;
1921                                 }
1922
1923                         if ((clnt_ecdh=EC_KEY_new()) == NULL)
1924                                 {
1925                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1926                                 goto err;
1927                                 }
1928
1929                         clnt_ecdh->group = srvr_group;
1930                         if (ecdh_clnt_cert)
1931                                 {
1932                                 /* Reuse key info from our certificate
1933                                  * We only need our private key to perform
1934                                  * the ECDH computation.
1935                                  */
1936                                 clnt_ecdh->priv_key = BN_dup(s->cert->key-> \
1937                                     privatekey->pkey.eckey->priv_key);
1938                                 }
1939                         else
1940                                 {
1941                                 /* Generate a new ECDH key pair */
1942                                 if (!(EC_KEY_generate_key(clnt_ecdh)))
1943                                         {
1944                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
1945                                         goto err;
1946                                         }
1947                                 }
1948
1949                         /* use the 'p' output buffer for the ECDH key, but
1950                          * make sure to clear it out afterwards
1951                          */
1952
1953                         n=ECDH_compute_key(p, srvr_ecpoint, clnt_ecdh);
1954                         if (n <= 0)
1955                                 {
1956                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1957                                        ERR_R_ECDH_LIB);
1958                                 goto err;
1959                                 }
1960
1961                         /* generate master key from the result */
1962                         s->session->master_key_length = s->method->ssl3_enc \
1963                             -> generate_master_secret(s,
1964                                 s->session->master_key,
1965                                 p, n);
1966
1967                         memset(p, 0, n); /* clean up */
1968
1969                         if (ecdh_clnt_cert)
1970                                 {
1971                                 /* Send empty client key exch message */
1972                                 n = 0;
1973                                 }
1974                         else
1975                                 {
1976                                 /* First check the size of encoding and
1977                                  * allocate memory accordingly.
1978                                  */
1979                                 encoded_pt_len =
1980                                     EC_POINT_point2oct(clnt_ecdh->group,
1981                                         clnt_ecdh->pub_key,
1982                                         POINT_CONVERSION_UNCOMPRESSED,
1983                                         NULL, 0, NULL);
1984
1985                                 encodedPoint = (unsigned char *)
1986                                     OPENSSL_malloc(encoded_pt_len *
1987                                         sizeof(unsigned char));
1988                                 bn_ctx = BN_CTX_new();
1989                                 if ((encodedPoint == NULL) ||
1990                                     (bn_ctx == NULL))
1991                                         {
1992                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1993                                         goto err;
1994                                         }
1995
1996                                 /* Encode the public key */
1997                                 n = EC_POINT_point2oct(clnt_ecdh->group,
1998                                     clnt_ecdh->pub_key,
1999                                     POINT_CONVERSION_UNCOMPRESSED,
2000                                     encodedPoint, encoded_pt_len, bn_ctx);
2001
2002                                 *p = n; /* length of encoded point */
2003                                 /* Encoded point will be copied here */
2004                                 p += 1;
2005                                 /* copy the point */
2006                                 memcpy((unsigned char *)p, encodedPoint, n);
2007                                 /* increment n to account for length field */
2008                                 n += 1;
2009                                 }
2010
2011                         /* Free allocated memory */
2012                         BN_CTX_free(bn_ctx);
2013                         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2014                         if (clnt_ecdh != NULL)
2015                                 {
2016                                  /* group is shared */
2017                                  clnt_ecdh->group = NULL;
2018                                  EC_KEY_free(clnt_ecdh);
2019                                 }
2020                         EVP_PKEY_free(srvr_pub_pkey);
2021                         }
2022 #endif /* !OPENSSL_NO_ECDH */
2023                 else
2024                         {
2025                         ssl3_send_alert(s, SSL3_AL_FATAL,
2026                             SSL_AD_HANDSHAKE_FAILURE);
2027                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2028                             ERR_R_INTERNAL_ERROR);
2029                         goto err;
2030                         }
2031
2032                 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
2033                 l2n3(n,d);
2034
2035                 s->state=SSL3_ST_CW_KEY_EXCH_B;
2036                 /* number of bytes to write */
2037                 s->init_num=n+4;
2038                 s->init_off=0;
2039                 }
2040
2041         /* SSL3_ST_CW_KEY_EXCH_B */
2042         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2043 err:
2044 #ifndef OPENSSL_NO_ECDH
2045         BN_CTX_free(bn_ctx);
2046         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2047         if (clnt_ecdh != NULL)
2048                 {
2049                 /* group is shared */
2050                 clnt_ecdh->group = NULL;
2051                 EC_KEY_free(clnt_ecdh);
2052                 }
2053         EVP_PKEY_free(srvr_pub_pkey);
2054 #endif
2055         return(-1);
2056         }
2057
2058 static int ssl3_send_client_verify(SSL *s)
2059         {
2060         unsigned char *p,*d;
2061         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
2062         EVP_PKEY *pkey;
2063 #ifndef OPENSSL_NO_RSA
2064         unsigned u=0;
2065 #endif
2066         unsigned long n;
2067 #ifndef OPENSSL_NO_DSA
2068         int j;
2069 #endif
2070
2071         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
2072                 {
2073                 d=(unsigned char *)s->init_buf->data;
2074                 p= &(d[4]);
2075                 pkey=s->cert->key->privatekey;
2076
2077                 s->method->ssl3_enc->cert_verify_mac(s,&(s->s3->finish_dgst2),
2078                         &(data[MD5_DIGEST_LENGTH]));
2079
2080 #ifndef OPENSSL_NO_RSA
2081                 if (pkey->type == EVP_PKEY_RSA)
2082                         {
2083                         s->method->ssl3_enc->cert_verify_mac(s,
2084                                 &(s->s3->finish_dgst1),&(data[0]));
2085                         if (RSA_sign(NID_md5_sha1, data,
2086                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
2087                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
2088                                 {
2089                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
2090                                 goto err;
2091                                 }
2092                         s2n(u,p);
2093                         n=u+2;
2094                         }
2095                 else
2096 #endif
2097 #ifndef OPENSSL_NO_DSA
2098                         if (pkey->type == EVP_PKEY_DSA)
2099                         {
2100                         if (!DSA_sign(pkey->save_type,
2101                                 &(data[MD5_DIGEST_LENGTH]),
2102                                 SHA_DIGEST_LENGTH,&(p[2]),
2103                                 (unsigned int *)&j,pkey->pkey.dsa))
2104                                 {
2105                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
2106                                 goto err;
2107                                 }
2108                         s2n(j,p);
2109                         n=j+2;
2110                         }
2111                 else
2112 #endif
2113 #ifndef OPENSSL_NO_ECDSA
2114                         if (pkey->type == EVP_PKEY_EC)
2115                         {
2116                         if (!ECDSA_sign(pkey->save_type,
2117                                 &(data[MD5_DIGEST_LENGTH]),
2118                                 SHA_DIGEST_LENGTH,&(p[2]),
2119                                 (unsigned int *)&j,pkey->pkey.eckey))
2120                                 {
2121                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
2122                                     ERR_R_ECDSA_LIB);
2123                                 goto err;
2124                                 }
2125                         s2n(j,p);
2126                         n=j+2;
2127                         }
2128                 else
2129 #endif
2130                         {
2131                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
2132                         goto err;
2133                         }
2134                 *(d++)=SSL3_MT_CERTIFICATE_VERIFY;
2135                 l2n3(n,d);
2136
2137                 s->init_num=(int)n+4;
2138                 s->init_off=0;
2139                 }
2140         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2141 err:
2142         return(-1);
2143         }
2144
2145 static int ssl3_send_client_certificate(SSL *s)
2146         {
2147         X509 *x509=NULL;
2148         EVP_PKEY *pkey=NULL;
2149         int i;
2150         unsigned long l;
2151
2152         if (s->state == SSL3_ST_CW_CERT_A)
2153                 {
2154                 if ((s->cert == NULL) ||
2155                         (s->cert->key->x509 == NULL) ||
2156                         (s->cert->key->privatekey == NULL))
2157                         s->state=SSL3_ST_CW_CERT_B;
2158                 else
2159                         s->state=SSL3_ST_CW_CERT_C;
2160                 }
2161
2162         /* We need to get a client cert */
2163         if (s->state == SSL3_ST_CW_CERT_B)
2164                 {
2165                 /* If we get an error, we need to
2166                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
2167                  * We then get retied later */
2168                 i=0;
2169                 if (s->ctx->client_cert_cb != NULL)
2170                         i=s->ctx->client_cert_cb(s,&(x509),&(pkey));
2171                 if (i < 0)
2172                         {
2173                         s->rwstate=SSL_X509_LOOKUP;
2174                         return(-1);
2175                         }
2176                 s->rwstate=SSL_NOTHING;
2177                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
2178                         {
2179                         s->state=SSL3_ST_CW_CERT_B;
2180                         if (    !SSL_use_certificate(s,x509) ||
2181                                 !SSL_use_PrivateKey(s,pkey))
2182                                 i=0;
2183                         }
2184                 else if (i == 1)
2185                         {
2186                         i=0;
2187                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
2188                         }
2189
2190                 if (x509 != NULL) X509_free(x509);
2191                 if (pkey != NULL) EVP_PKEY_free(pkey);
2192                 if (i == 0)
2193                         {
2194                         if (s->version == SSL3_VERSION)
2195                                 {
2196                                 s->s3->tmp.cert_req=0;
2197                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
2198                                 return(1);
2199                                 }
2200                         else
2201                                 {
2202                                 s->s3->tmp.cert_req=2;
2203                                 }
2204                         }
2205
2206                 /* Ok, we have a cert */
2207                 s->state=SSL3_ST_CW_CERT_C;
2208                 }
2209
2210         if (s->state == SSL3_ST_CW_CERT_C)
2211                 {
2212                 s->state=SSL3_ST_CW_CERT_D;
2213                 l=ssl3_output_cert_chain(s,
2214                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
2215                 s->init_num=(int)l;
2216                 s->init_off=0;
2217                 }
2218         /* SSL3_ST_CW_CERT_D */
2219         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2220         }
2221
2222 #define has_bits(i,m)   (((i)&(m)) == (m))
2223
2224 static int ssl3_check_cert_and_algorithm(SSL *s)
2225         {
2226         int i,idx;
2227         long algs;
2228         EVP_PKEY *pkey=NULL;
2229         SESS_CERT *sc;
2230 #ifndef OPENSSL_NO_RSA
2231         RSA *rsa;
2232 #endif
2233 #ifndef OPENSSL_NO_DH
2234         DH *dh;
2235 #endif
2236
2237         sc=s->session->sess_cert;
2238
2239         if (sc == NULL)
2240                 {
2241                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,ERR_R_INTERNAL_ERROR);
2242                 goto err;
2243                 }
2244
2245         algs=s->s3->tmp.new_cipher->algorithms;
2246
2247         /* we don't have a certificate */
2248         if (algs & (SSL_aDH|SSL_aNULL|SSL_aKRB5))
2249                 return(1);
2250
2251 #ifndef OPENSSL_NO_RSA
2252         rsa=s->session->sess_cert->peer_rsa_tmp;
2253 #endif
2254 #ifndef OPENSSL_NO_DH
2255         dh=s->session->sess_cert->peer_dh_tmp;
2256 #endif
2257
2258         /* This is the passed certificate */
2259
2260         idx=sc->peer_cert_type;
2261 #ifndef OPENSSL_NO_ECDH
2262         if (idx == SSL_PKEY_ECC)
2263                 {
2264                 if (check_srvr_ecc_cert_and_alg(sc->peer_pkeys[idx].x509,
2265                     s->s3->tmp.new_cipher) == 0)
2266                         { /* check failed */
2267                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_BAD_ECC_CERT);
2268                         goto f_err;
2269                         }
2270                 else
2271                         {
2272                         return 1;
2273                         }
2274                 }
2275 #endif
2276         pkey=X509_get_pubkey(sc->peer_pkeys[idx].x509);
2277         i=X509_certificate_type(sc->peer_pkeys[idx].x509,pkey);
2278         EVP_PKEY_free(pkey);
2279
2280
2281         /* Check that we have a certificate if we require one */
2282         if ((algs & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
2283                 {
2284                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
2285                 goto f_err;
2286                 }
2287 #ifndef OPENSSL_NO_DSA
2288         else if ((algs & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
2289                 {
2290                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
2291                 goto f_err;
2292                 }
2293 #endif
2294 #ifndef OPENSSL_NO_RSA
2295         if ((algs & SSL_kRSA) &&
2296                 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
2297                 {
2298                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
2299                 goto f_err;
2300                 }
2301 #endif
2302 #ifndef OPENSSL_NO_DH
2303         if ((algs & SSL_kEDH) &&
2304                 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
2305                 {
2306                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
2307                 goto f_err;
2308                 }
2309         else if ((algs & SSL_kDHr) && !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
2310                 {
2311                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
2312                 goto f_err;
2313                 }
2314 #ifndef OPENSSL_NO_DSA
2315         else if ((algs & SSL_kDHd) && !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
2316                 {
2317                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
2318                 goto f_err;
2319                 }
2320 #endif
2321 #endif
2322
2323         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i,EVP_PKT_EXP))
2324                 {
2325 #ifndef OPENSSL_NO_RSA
2326                 if (algs & SSL_kRSA)
2327                         {
2328                         if (rsa == NULL
2329                             || RSA_size(rsa) > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
2330                                 {
2331                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
2332                                 goto f_err;
2333                                 }
2334                         }
2335                 else
2336 #endif
2337 #ifndef OPENSSL_NO_DH
2338                         if (algs & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2339                             {
2340                             if (dh == NULL
2341                                 || DH_size(dh) > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
2342                                 {
2343                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
2344                                 goto f_err;
2345                                 }
2346                         }
2347                 else
2348 #endif
2349                         {
2350                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
2351                         goto f_err;
2352                         }
2353                 }
2354         return(1);
2355 f_err:
2356         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
2357 err:
2358         return(0);
2359         }
2360
2361
2362 #ifndef OPENSSL_NO_ECDH
2363 /* This is the complement of nid2curve_id in s3_srvr.c. */
2364 static int curve_id2nid(int curve_id)
2365 {
2366         /* ECC curves from draft-ietf-tls-ecc-01.txt (Mar 15, 2001) */
2367         static int nid_list[26] =
2368         {
2369                 0,
2370                 NID_sect163k1, /* sect163k1 (1) */
2371                 NID_sect163r1, /* sect163r1 (2) */
2372                 NID_sect163r2, /* sect163r2 (3) */
2373                 NID_sect193r1, /* sect193r1 (4) */
2374                 NID_sect193r2, /* sect193r2 (5) */
2375                 NID_sect233k1, /* sect233k1 (6) */
2376                 NID_sect233r1, /* sect233r1 (7) */
2377                 NID_sect239k1, /* sect239k1 (8) */
2378                 NID_sect283k1, /* sect283k1 (9) */
2379                 NID_sect283r1, /* sect283r1 (10) */
2380                 NID_sect409k1, /* sect409k1 (11) */
2381                 NID_sect409r1, /* sect409r1 (12) */
2382                 NID_sect571k1, /* sect571k1 (13) */
2383                 NID_sect571r1, /* sect571r1 (14) */
2384                 NID_secp160k1, /* secp160k1 (15) */
2385                 NID_secp160r1, /* secp160r1 (16) */
2386                 NID_secp160r2, /* secp160r2 (17) */
2387                 NID_secp192k1, /* secp192k1 (18) */
2388                 NID_X9_62_prime192v1, /* secp192r1 (19) */
2389                 NID_secp224k1, /* secp224k1 (20) */
2390                 NID_secp224r1, /* secp224r1 (21) */
2391                 NID_secp256k1, /* secp256k1 (22) */
2392                 NID_X9_62_prime256v1, /* secp256r1 (23) */
2393                 NID_secp384r1, /* secp384r1 (24) */
2394                 NID_secp521r1  /* secp521r1 (25) */
2395         };
2396
2397         if ((curve_id < 1) || (curve_id > 25)) return 0;
2398
2399         return nid_list[curve_id];
2400 }
2401 #endif