ssl/s3_clnt.c

   1 /* ssl/s3_clnt.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58 /* ====================================================================
  59  * Copyright (c) 1998-2003 The OpenSSL Project.  All rights reserved.
  60  *
  61  * Redistribution and use in source and binary forms, with or without
  62  * modification, are permitted provided that the following conditions
  63  * are met:
  64  *
  65  * 1. Redistributions of source code must retain the above copyright
  66  *    notice, this list of conditions and the following disclaimer.
  67  *
  68  * 2. Redistributions in binary form must reproduce the above copyright
  69  *    notice, this list of conditions and the following disclaimer in
  70  *    the documentation and/or other materials provided with the
  71  *    distribution.
  72  *
  73  * 3. All advertising materials mentioning features or use of this
  74  *    software must display the following acknowledgment:
  75  *    "This product includes software developed by the OpenSSL Project
  76  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  77  *
  78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  79  *    endorse or promote products derived from this software without
  80  *    prior written permission. For written permission, please contact
  81  *    openssl-core@openssl.org.
  82  *
  83  * 5. Products derived from this software may not be called "OpenSSL"
  84  *    nor may "OpenSSL" appear in their names without prior written
  85  *    permission of the OpenSSL Project.
  86  *
  87  * 6. Redistributions of any form whatsoever must retain the following
  88  *    acknowledgment:
  89  *    "This product includes software developed by the OpenSSL Project
  90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  91  *
  92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  95  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 103  * OF THE POSSIBILITY OF SUCH DAMAGE.
 104  * ====================================================================
 105  *
 106  * This product includes cryptographic software written by Eric Young
 107  * (eay@cryptsoft.com).  This product includes software written by Tim
 108  * Hudson (tjh@cryptsoft.com).
 109  *
 110  */
 111 /* ====================================================================
 112  * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
 113  *
 114  * Portions of the attached software ("Contribution") are developed by
 115  * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
 116  *
 117  * The Contribution is licensed pursuant to the OpenSSL open source
 118  * license provided above.
 119  *
 120  * ECC cipher suite support in OpenSSL originally written by
 121  * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories.
 122  *
 123  */
 124
 125 #include <stdio.h>
 126 #include "ssl_locl.h"
 127 #include "kssl_lcl.h"
 128 #include <openssl/buffer.h>
 129 #include <openssl/rand.h>
 130 #include <openssl/objects.h>
 131 #include <openssl/evp.h>
 132 #include <openssl/md5.h>
 133
 134 static SSL_METHOD *ssl3_get_client_method(int ver);
 135 static int ssl3_client_hello(SSL *s);
 136 static int ssl3_get_server_hello(SSL *s);
 137 static int ssl3_get_certificate_request(SSL *s);
 138 static int ca_dn_cmp(const X509_NAME * const *a,const X509_NAME * const *b);
 139 static int ssl3_get_server_done(SSL *s);
 140 static int ssl3_send_client_verify(SSL *s);
 141 static int ssl3_send_client_certificate(SSL *s);
 142 static int ssl3_send_client_key_exchange(SSL *s);
 143 static int ssl3_get_key_exchange(SSL *s);
 144 static int ssl3_get_server_certificate(SSL *s);
 145 static int ssl3_check_cert_and_algorithm(SSL *s);
 146
 147 #ifndef OPENSSL_NO_ECDH
 148 static int curve_id2nid(int curve_id);
 149 int check_srvr_ecc_cert_and_alg(X509 *x, SSL_CIPHER *cs);
 150 #endif
 151
 152 static SSL_METHOD *ssl3_get_client_method(int ver)
 153         {
 154         if (ver == SSL3_VERSION)
 155                 return(SSLv3_client_method());
 156         else
 157                 return(NULL);
 158         }
 159
 160 SSL_METHOD *SSLv3_client_method(void)
 161         {
 162         static int init=1;
 163         static SSL_METHOD SSLv3_client_data;
 164
 165         if (init)
 166                 {
 167                 CRYPTO_w_lock(CRYPTO_LOCK_SSL_METHOD);
 168
 169                 if (init)
 170                         {
 171                         memcpy((char *)&SSLv3_client_data,(char *)sslv3_base_method(),
 172                                 sizeof(SSL_METHOD));
 173                         SSLv3_client_data.ssl_connect=ssl3_connect;
 174                         SSLv3_client_data.get_ssl_method=ssl3_get_client_method;
 175                         init=0;
 176                         }
 177
 178                 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_METHOD);
 179                 }
 180         return(&SSLv3_client_data);
 181         }
 182
 183 int ssl3_connect(SSL *s)
 184         {
 185         BUF_MEM *buf=NULL;
 186         unsigned long Time=time(NULL),l;
 187         long num1;
 188         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 189         int ret= -1;
 190         int new_state,state,skip=0;;
 191
 192         RAND_add(&Time,sizeof(Time),0);
 193         ERR_clear_error();
 194         clear_sys_error();
 195
 196         if (s->info_callback != NULL)
 197                 cb=s->info_callback;
 198         else if (s->ctx->info_callback != NULL)
 199                 cb=s->ctx->info_callback;
 200
 201         s->in_handshake++;
 202         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 203
 204         for (;;)
 205                 {
 206                 state=s->state;
 207
 208                 switch(s->state)
 209                         {
 210                 case SSL_ST_RENEGOTIATE:
 211                         s->new_session=1;
 212                         s->state=SSL_ST_CONNECT;
 213                         s->ctx->stats.sess_connect_renegotiate++;
 214                         /* break */
 215                 case SSL_ST_BEFORE:
 216                 case SSL_ST_CONNECT:
 217                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 218                 case SSL_ST_OK|SSL_ST_CONNECT:
 219
 220                         s->server=0;
 221                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 222
 223                         if ((s->version & 0xff00 ) != 0x0300)
 224                                 {
 225                                 SSLerr(SSL_F_SSL3_CONNECT, ERR_R_INTERNAL_ERROR);
 226                                 ret = -1;
 227                                 goto end;
 228                                 }
 229
 230                         /* s->version=SSL3_VERSION; */
 231                         s->type=SSL_ST_CONNECT;
 232
 233                         if (s->init_buf == NULL)
 234                                 {
 235                                 if ((buf=BUF_MEM_new()) == NULL)
 236                                         {
 237                                         ret= -1;
 238                                         goto end;
 239                                         }
 240                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 241                                         {
 242                                         ret= -1;
 243                                         goto end;
 244                                         }
 245                                 s->init_buf=buf;
 246                                 buf=NULL;
 247                                 }
 248
 249                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
 250
 251                         /* setup buffing BIO */
 252                         if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
 253
 254                         /* don't push the buffering BIO quite yet */
 255
 256                         ssl3_init_finished_mac(s);
 257
 258                         s->state=SSL3_ST_CW_CLNT_HELLO_A;
 259                         s->ctx->stats.sess_connect++;
 260                         s->init_num=0;
 261                         break;
 262
 263                 case SSL3_ST_CW_CLNT_HELLO_A:
 264                 case SSL3_ST_CW_CLNT_HELLO_B:
 265
 266                         s->shutdown=0;
 267                         ret=ssl3_client_hello(s);
 268                         if (ret <= 0) goto end;
 269                         s->state=SSL3_ST_CR_SRVR_HELLO_A;
 270                         s->init_num=0;
 271
 272                         /* turn on buffering for the next lot of output */
 273                         if (s->bbio != s->wbio)
 274                                 s->wbio=BIO_push(s->bbio,s->wbio);
 275
 276                         break;
 277
 278                 case SSL3_ST_CR_SRVR_HELLO_A:
 279                 case SSL3_ST_CR_SRVR_HELLO_B:
 280                         ret=ssl3_get_server_hello(s);
 281                         if (ret <= 0) goto end;
 282                         if (s->hit)
 283                                 s->state=SSL3_ST_CR_FINISHED_A;
 284                         else
 285                                 s->state=SSL3_ST_CR_CERT_A;
 286                         s->init_num=0;
 287                         break;
 288
 289                 case SSL3_ST_CR_CERT_A:
 290                 case SSL3_ST_CR_CERT_B:
 291                         /* Check if it is anon DH/ECDH */
 292                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 293                                 {
 294                                 ret=ssl3_get_server_certificate(s);
 295                                 if (ret <= 0) goto end;
 296                                 }
 297                         else
 298                                 skip=1;
 299                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 300                         s->init_num=0;
 301                         break;
 302
 303                 case SSL3_ST_CR_KEY_EXCH_A:
 304                 case SSL3_ST_CR_KEY_EXCH_B:
 305                         ret=ssl3_get_key_exchange(s);
 306                         if (ret <= 0) goto end;
 307                         s->state=SSL3_ST_CR_CERT_REQ_A;
 308                         s->init_num=0;
 309
 310                         /* at this point we check that we have the
 311                          * required stuff from the server */
 312                         if (!ssl3_check_cert_and_algorithm(s))
 313                                 {
 314                                 ret= -1;
 315                                 goto end;
 316                                 }
 317                         break;
 318
 319                 case SSL3_ST_CR_CERT_REQ_A:
 320                 case SSL3_ST_CR_CERT_REQ_B:
 321                         ret=ssl3_get_certificate_request(s);
 322                         if (ret <= 0) goto end;
 323                         s->state=SSL3_ST_CR_SRVR_DONE_A;
 324                         s->init_num=0;
 325                         break;
 326
 327                 case SSL3_ST_CR_SRVR_DONE_A:
 328                 case SSL3_ST_CR_SRVR_DONE_B:
 329                         ret=ssl3_get_server_done(s);
 330                         if (ret <= 0) goto end;
 331                         if (s->s3->tmp.cert_req)
 332                                 s->state=SSL3_ST_CW_CERT_A;
 333                         else
 334                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
 335                         s->init_num=0;
 336
 337                         break;
 338
 339                 case SSL3_ST_CW_CERT_A:
 340                 case SSL3_ST_CW_CERT_B:
 341                 case SSL3_ST_CW_CERT_C:
 342                 case SSL3_ST_CW_CERT_D:
 343                         ret=ssl3_send_client_certificate(s);
 344                         if (ret <= 0) goto end;
 345                         s->state=SSL3_ST_CW_KEY_EXCH_A;
 346                         s->init_num=0;
 347                         break;
 348
 349                 case SSL3_ST_CW_KEY_EXCH_A:
 350                 case SSL3_ST_CW_KEY_EXCH_B:
 351                         ret=ssl3_send_client_key_exchange(s);
 352                         if (ret <= 0) goto end;
 353                         l=s->s3->tmp.new_cipher->algorithms;
 354                         /* EAY EAY EAY need to check for DH fix cert
 355                          * sent back */
 356                         /* For TLS, cert_req is set to 2, so a cert chain
 357                          * of nothing is sent, but no verify packet is sent */
 358                         /* XXX: For now, we do not support client
 359                          * authentication in ECDH cipher suites with
 360                          * ECDH (rather than ECDSA) certificates.
 361                          * We need to skip the certificate verify
 362                          * message when client's ECDH public key is sent
 363                          * inside the client certificate.
 364                          */
 365                         if (s->s3->tmp.cert_req == 1)
 366                                 {
 367                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
 368                                 }
 369                         else
 370                                 {
 371                                 s->state=SSL3_ST_CW_CHANGE_A;
 372                                 s->s3->change_cipher_spec=0;
 373                                 }
 374
 375                         s->init_num=0;
 376                         break;
 377
 378                 case SSL3_ST_CW_CERT_VRFY_A:
 379                 case SSL3_ST_CW_CERT_VRFY_B:
 380                         ret=ssl3_send_client_verify(s);
 381                         if (ret <= 0) goto end;
 382                         s->state=SSL3_ST_CW_CHANGE_A;
 383                         s->init_num=0;
 384                         s->s3->change_cipher_spec=0;
 385                         break;
 386
 387                 case SSL3_ST_CW_CHANGE_A:
 388                 case SSL3_ST_CW_CHANGE_B:
 389                         ret=ssl3_send_change_cipher_spec(s,
 390                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
 391                         if (ret <= 0) goto end;
 392                         s->state=SSL3_ST_CW_FINISHED_A;
 393                         s->init_num=0;
 394
 395                         s->session->cipher=s->s3->tmp.new_cipher;
 396                         if (s->s3->tmp.new_compression == NULL)
 397                                 s->session->compress_meth=0;
 398                         else
 399                                 s->session->compress_meth=
 400                                         s->s3->tmp.new_compression->id;
 401                         if (!s->method->ssl3_enc->setup_key_block(s))
 402                                 {
 403                                 ret= -1;
 404                                 goto end;
 405                                 }
 406
 407                         if (!s->method->ssl3_enc->change_cipher_state(s,
 408                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 409                                 {
 410                                 ret= -1;
 411                                 goto end;
 412                                 }
 413
 414                         break;
 415
 416                 case SSL3_ST_CW_FINISHED_A:
 417                 case SSL3_ST_CW_FINISHED_B:
 418                         ret=ssl3_send_finished(s,
 419                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
 420                                 s->method->ssl3_enc->client_finished_label,
 421                                 s->method->ssl3_enc->client_finished_label_len);
 422                         if (ret <= 0) goto end;
 423                         s->state=SSL3_ST_CW_FLUSH;
 424
 425                         /* clear flags */
 426                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
 427                         if (s->hit)
 428                                 {
 429                                 s->s3->tmp.next_state=SSL_ST_OK;
 430                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
 431                                         {
 432                                         s->state=SSL_ST_OK;
 433                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
 434                                         s->s3->delay_buf_pop_ret=0;
 435                                         }
 436                                 }
 437                         else
 438                                 {
 439                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
 440                                 }
 441                         s->init_num=0;
 442                         break;
 443
 444                 case SSL3_ST_CR_FINISHED_A:
 445                 case SSL3_ST_CR_FINISHED_B:
 446
 447                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
 448                                 SSL3_ST_CR_FINISHED_B);
 449                         if (ret <= 0) goto end;
 450
 451                         if (s->hit)
 452                                 s->state=SSL3_ST_CW_CHANGE_A;
 453                         else
 454                                 s->state=SSL_ST_OK;
 455                         s->init_num=0;
 456                         break;
 457
 458                 case SSL3_ST_CW_FLUSH:
 459                         /* number of bytes to be flushed */
 460                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 461                         if (num1 > 0)
 462                                 {
 463                                 s->rwstate=SSL_WRITING;
 464                                 num1=BIO_flush(s->wbio);
 465                                 if (num1 <= 0) { ret= -1; goto end; }
 466                                 s->rwstate=SSL_NOTHING;
 467                                 }
 468
 469                         s->state=s->s3->tmp.next_state;
 470                         break;
 471
 472                 case SSL_ST_OK:
 473                         /* clean a few things up */
 474                         ssl3_cleanup_key_block(s);
 475
 476                         if (s->init_buf != NULL)
 477                                 {
 478                                 BUF_MEM_free(s->init_buf);
 479                                 s->init_buf=NULL;
 480                                 }
 481
 482                         /* If we are not 'joining' the last two packets,
 483                          * remove the buffering now */
 484                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 485                                 ssl_free_wbio_buffer(s);
 486                         /* else do it later in ssl3_write */
 487
 488                         s->init_num=0;
 489                         s->new_session=0;
 490
 491                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 492                         if (s->hit) s->ctx->stats.sess_hit++;
 493
 494                         ret=1;
 495                         /* s->server=0; */
 496                         s->handshake_func=ssl3_connect;
 497                         s->ctx->stats.sess_connect_good++;
 498
 499                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 500
 501                         goto end;
 502                         /* break; */
 503
 504                 default:
 505                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_UNKNOWN_STATE);
 506                         ret= -1;
 507                         goto end;
 508                         /* break; */
 509                         }
 510
 511                 /* did we do anything */
 512                 if (!s->s3->tmp.reuse_message && !skip)
 513                         {
 514                         if (s->debug)
 515                                 {
 516                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 517                                         goto end;
 518                                 }
 519
 520                         if ((cb != NULL) && (s->state != state))
 521                                 {
 522                                 new_state=s->state;
 523                                 s->state=state;
 524                                 cb(s,SSL_CB_CONNECT_LOOP,1);
 525                                 s->state=new_state;
 526                                 }
 527                         }
 528                 skip=0;
 529                 }
 530 end:
 531         s->in_handshake--;
 532         if (buf != NULL)
 533                 BUF_MEM_free(buf);
 534         if (cb != NULL)
 535                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 536         return(ret);
 537         }
 538
 539
 540 static int ssl3_client_hello(SSL *s)
 541         {
 542         unsigned char *buf;
 543         unsigned char *p,*d;
 544         int i,j;
 545         unsigned long Time,l;
 546         SSL_COMP *comp;
 547
 548         buf=(unsigned char *)s->init_buf->data;
 549         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
 550                 {
 551                 if ((s->session == NULL) ||
 552                         (s->session->ssl_version != s->version) ||
 553                         (s->session->not_resumable))
 554                         {
 555                         if (!ssl_get_new_session(s,0))
 556                                 goto err;
 557                         }
 558                 /* else use the pre-loaded session */
 559
 560                 p=s->s3->client_random;
 561                 Time=time(NULL);                        /* Time */
 562                 l2n(Time,p);
 563                 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
 564
 565                 /* Do the message type and length last */
 566                 d=p= &(buf[4]);
 567
 568                 *(p++)=s->version>>8;
 569                 *(p++)=s->version&0xff;
 570                 s->client_version=s->version;
 571
 572                 /* Random stuff */
 573                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 574                 p+=SSL3_RANDOM_SIZE;
 575
 576                 /* Session ID */
 577                 if (s->new_session)
 578                         i=0;
 579                 else
 580                         i=s->session->session_id_length;
 581                 *(p++)=i;
 582                 if (i != 0)
 583                         {
 584                         if (i > (int)sizeof(s->session->session_id))
 585                                 {
 586                                 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 587                                 goto err;
 588                                 }
 589                         memcpy(p,s->session->session_id,i);
 590                         p+=i;
 591                         }
 592
 593                 /* Ciphers supported */
 594                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]));
 595                 if (i == 0)
 596                         {
 597                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 598                         goto err;
 599                         }
 600                 s2n(i,p);
 601                 p+=i;
 602
 603                 /* COMPRESSION */
 604                 if (s->ctx->comp_methods == NULL)
 605                         j=0;
 606                 else
 607                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
 608                 *(p++)=1+j;
 609                 for (i=0; i<j; i++)
 610                         {
 611                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
 612                         *(p++)=comp->id;
 613                         }
 614                 *(p++)=0; /* Add the NULL method */
 615
 616                 l=(p-d);
 617                 d=buf;
 618                 *(d++)=SSL3_MT_CLIENT_HELLO;
 619                 l2n3(l,d);
 620
 621                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 622                 /* number of bytes to write */
 623                 s->init_num=p-buf;
 624                 s->init_off=0;
 625                 }
 626
 627         /* SSL3_ST_CW_CLNT_HELLO_B */
 628         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 629 err:
 630         return(-1);
 631         }
 632
 633 static int ssl3_get_server_hello(SSL *s)
 634         {
 635         STACK_OF(SSL_CIPHER) *sk;
 636         SSL_CIPHER *c;
 637         unsigned char *p,*d;
 638         int i,al,ok;
 639         unsigned int j;
 640         long n;
 641         SSL_COMP *comp;
 642
 643         n=ssl3_get_message(s,
 644                 SSL3_ST_CR_SRVR_HELLO_A,
 645                 SSL3_ST_CR_SRVR_HELLO_B,
 646                 SSL3_MT_SERVER_HELLO,
 647                 300, /* ?? */
 648                 &ok);
 649
 650         if (!ok) return((int)n);
 651         d=p=(unsigned char *)s->init_msg;
 652
 653         if ((p[0] != (s->version>>8)) || (p[1] != (s->version&0xff)))
 654                 {
 655                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
 656                 s->version=(s->version&0xff00)|p[1];
 657                 al=SSL_AD_PROTOCOL_VERSION;
 658                 goto f_err;
 659                 }
 660         p+=2;
 661
 662         /* load the server hello data */
 663         /* load the server random */
 664         memcpy(s->s3->server_random,p,SSL3_RANDOM_SIZE);
 665         p+=SSL3_RANDOM_SIZE;
 666
 667         /* get the session-id */
 668         j= *(p++);
 669
 670         if ((j > sizeof s->session->session_id) || (j > SSL3_SESSION_ID_SIZE))
 671                 {
 672                 al=SSL_AD_ILLEGAL_PARAMETER;
 673                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_LONG);
 674                 goto f_err;
 675                 }
 676
 677         if (j != 0 && j == s->session->session_id_length
 678             && memcmp(p,s->session->session_id,j) == 0)
 679             {
 680             if(s->sid_ctx_length != s->session->sid_ctx_length
 681                || memcmp(s->session->sid_ctx,s->sid_ctx,s->sid_ctx_length))
 682                 {
 683                 /* actually a client application bug */
 684                 al=SSL_AD_ILLEGAL_PARAMETER;
 685                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
 686                 goto f_err;
 687                 }
 688             s->hit=1;
 689             }
 690         else    /* a miss or crap from the other end */
 691                 {
 692                 /* If we were trying for session-id reuse, make a new
 693                  * SSL_SESSION so we don't stuff up other people */
 694                 s->hit=0;
 695                 if (s->session->session_id_length > 0)
 696                         {
 697                         if (!ssl_get_new_session(s,0))
 698                                 {
 699                                 al=SSL_AD_INTERNAL_ERROR;
 700                                 goto f_err;
 701                                 }
 702                         }
 703                 s->session->session_id_length=j;
 704                 memcpy(s->session->session_id,p,j); /* j could be 0 */
 705                 }
 706         p+=j;
 707         c=ssl_get_cipher_by_char(s,p);
 708         if (c == NULL)
 709                 {
 710                 /* unknown cipher */
 711                 al=SSL_AD_ILLEGAL_PARAMETER;
 712                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNKNOWN_CIPHER_RETURNED);
 713                 goto f_err;
 714                 }
 715         p+=ssl_put_cipher_by_char(s,NULL,NULL);
 716
 717         sk=ssl_get_ciphers_by_id(s);
 718         i=sk_SSL_CIPHER_find(sk,c);
 719         if (i < 0)
 720                 {
 721                 /* we did not say we would use this cipher */
 722                 al=SSL_AD_ILLEGAL_PARAMETER;
 723                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
 724                 goto f_err;
 725                 }
 726
 727         /* Depending on the session caching (internal/external), the cipher
 728            and/or cipher_id values may not be set. Make sure that
 729            cipher_id is set and use it for comparison. */
 730         if (s->session->cipher)
 731                 s->session->cipher_id = s->session->cipher->id;
 732         if (s->hit && (s->session->cipher_id != c->id))
 733                 {
 734                 if (!(s->options &
 735                         SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
 736                         {
 737                         al=SSL_AD_ILLEGAL_PARAMETER;
 738                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
 739                         goto f_err;
 740                         }
 741                 }
 742         s->s3->tmp.new_cipher=c;
 743
 744         /* lets get the compression algorithm */
 745         /* COMPRESSION */
 746         j= *(p++);
 747         if (j == 0)
 748                 comp=NULL;
 749         else
 750                 comp=ssl3_comp_find(s->ctx->comp_methods,j);
 751
 752         if ((j != 0) && (comp == NULL))
 753                 {
 754                 al=SSL_AD_ILLEGAL_PARAMETER;
 755                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
 756                 goto f_err;
 757                 }
 758         else
 759                 {
 760                 s->s3->tmp.new_compression=comp;
 761                 }
 762
 763         if (p != (d+n))
 764                 {
 765                 /* wrong packet length */
 766                 al=SSL_AD_DECODE_ERROR;
 767                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
 768                 goto err;
 769                 }
 770
 771         return(1);
 772 f_err:
 773         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 774 err:
 775         return(-1);
 776         }
 777
 778 static int ssl3_get_server_certificate(SSL *s)
 779         {
 780         int al,i,ok,ret= -1;
 781         unsigned long n,nc,llen,l;
 782         X509 *x=NULL;
 783         unsigned char *p,*d,*q;
 784         STACK_OF(X509) *sk=NULL;
 785         SESS_CERT *sc;
 786         EVP_PKEY *pkey=NULL;
 787         int need_cert = 1; /* VRS: 0=> will allow null cert if auth == KRB5 */
 788
 789         n=ssl3_get_message(s,
 790                 SSL3_ST_CR_CERT_A,
 791                 SSL3_ST_CR_CERT_B,
 792                 -1,
 793                 s->max_cert_list,
 794                 &ok);
 795
 796         if (!ok) return((int)n);
 797
 798         if (s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE)
 799                 {
 800                 s->s3->tmp.reuse_message=1;
 801                 return(1);
 802                 }
 803
 804         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
 805                 {
 806                 al=SSL_AD_UNEXPECTED_MESSAGE;
 807                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
 808                 goto f_err;
 809                 }
 810         d=p=(unsigned char *)s->init_msg;
 811
 812         if ((sk=sk_X509_new_null()) == NULL)
 813                 {
 814                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
 815                 goto err;
 816                 }
 817
 818         n2l3(p,llen);
 819         if (llen+3 != n)
 820                 {
 821                 al=SSL_AD_DECODE_ERROR;
 822                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
 823                 goto f_err;
 824                 }
 825         for (nc=0; nc<llen; )
 826                 {
 827                 n2l3(p,l);
 828                 if ((l+nc+3) > llen)
 829                         {
 830                         al=SSL_AD_DECODE_ERROR;
 831                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
 832                         goto f_err;
 833                         }
 834
 835                 q=p;
 836                 x=d2i_X509(NULL,&q,l);
 837                 if (x == NULL)
 838                         {
 839                         al=SSL_AD_BAD_CERTIFICATE;
 840                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
 841                         goto f_err;
 842                         }
 843                 if (q != (p+l))
 844                         {
 845                         al=SSL_AD_DECODE_ERROR;
 846                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
 847                         goto f_err;
 848                         }
 849                 if (!sk_X509_push(sk,x))
 850                         {
 851                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
 852                         goto err;
 853                         }
 854                 x=NULL;
 855                 nc+=l+3;
 856                 p=q;
 857                 }
 858
 859         i=ssl_verify_cert_chain(s,sk);
 860         if ((s->verify_mode != SSL_VERIFY_NONE) && (!i)
 861 #ifndef OPENSSL_NO_KRB5
 862                 && (s->s3->tmp.new_cipher->algorithms & (SSL_MKEY_MASK|SSL_AUTH_MASK))
 863                 != (SSL_aKRB5|SSL_kKRB5)
 864 #endif /* OPENSSL_NO_KRB5 */
 865                 )
 866                 {
 867                 al=ssl_verify_alarm_type(s->verify_result);
 868                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
 869                 goto f_err;
 870                 }
 871         ERR_clear_error(); /* but we keep s->verify_result */
 872
 873         sc=ssl_sess_cert_new();
 874         if (sc == NULL) goto err;
 875
 876         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
 877         s->session->sess_cert=sc;
 878
 879         sc->cert_chain=sk;
 880         /* Inconsistency alert: cert_chain does include the peer's
 881          * certificate, which we don't include in s3_srvr.c */
 882         x=sk_X509_value(sk,0);
 883         sk=NULL;
 884         /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/
 885
 886         pkey=X509_get_pubkey(x);
 887
 888         /* VRS: allow null cert if auth == KRB5 */
 889         need_cert =     ((s->s3->tmp.new_cipher->algorithms
 890                          & (SSL_MKEY_MASK|SSL_AUTH_MASK))
 891                          == (SSL_aKRB5|SSL_kKRB5))? 0: 1;
 892
 893 #ifdef KSSL_DEBUG
 894         printf("pkey,x = %p, %p\n", pkey,x);
 895         printf("ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x,pkey));
 896         printf("cipher, alg, nc = %s, %lx, %d\n", s->s3->tmp.new_cipher->name,
 897                 s->s3->tmp.new_cipher->algorithms, need_cert);
 898 #endif    /* KSSL_DEBUG */
 899
 900         if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey)))
 901                 {
 902                 x=NULL;
 903                 al=SSL3_AL_FATAL;
 904                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
 905                         SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
 906                 goto f_err;
 907                 }
 908
 909         i=ssl_cert_type(x,pkey);
 910         if (need_cert && i < 0)
 911                 {
 912                 x=NULL;
 913                 al=SSL3_AL_FATAL;
 914                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
 915                         SSL_R_UNKNOWN_CERTIFICATE_TYPE);
 916                 goto f_err;
 917                 }
 918
 919         if (need_cert)
 920                 {
 921                 sc->peer_cert_type=i;
 922                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
 923                 /* Why would the following ever happen?
 924                  * We just created sc a couple of lines ago. */
 925                 if (sc->peer_pkeys[i].x509 != NULL)
 926                         X509_free(sc->peer_pkeys[i].x509);
 927                 sc->peer_pkeys[i].x509=x;
 928                 sc->peer_key= &(sc->peer_pkeys[i]);
 929
 930                 if (s->session->peer != NULL)
 931                         X509_free(s->session->peer);
 932                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
 933                 s->session->peer=x;
 934                 }
 935         else
 936                 {
 937                 sc->peer_cert_type=i;
 938                 sc->peer_key= NULL;
 939
 940                 if (s->session->peer != NULL)
 941                         X509_free(s->session->peer);
 942                 s->session->peer=NULL;
 943                 }
 944         s->session->verify_result = s->verify_result;
 945
 946         x=NULL;
 947         ret=1;
 948
 949         if (0)
 950                 {
 951 f_err:
 952                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
 953                 }
 954 err:
 955         EVP_PKEY_free(pkey);
 956         X509_free(x);
 957         sk_X509_pop_free(sk,X509_free);
 958         return(ret);
 959         }
 960
 961 static int ssl3_get_key_exchange(SSL *s)
 962         {
 963 #ifndef OPENSSL_NO_RSA
 964         unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
 965 #endif
 966         EVP_MD_CTX md_ctx;
 967         unsigned char *param,*p;
 968         int al,i,j,param_len,ok;
 969         long n,alg;
 970         EVP_PKEY *pkey=NULL;
 971 #ifndef OPENSSL_NO_RSA
 972         RSA *rsa=NULL;
 973 #endif
 974 #ifndef OPENSSL_NO_DH
 975         DH *dh=NULL;
 976 #endif
 977 #ifndef OPENSSL_NO_ECDH
 978         EC_KEY *ecdh = NULL;
 979         BN_CTX *bn_ctx = NULL;
 980         EC_POINT *srvr_ecpoint = NULL;
 981         int curve_nid = 0;
 982         int encoded_pt_len = 0;
 983 #endif
 984
 985         /* use same message size as in ssl3_get_certificate_request()
 986          * as ServerKeyExchange message may be skipped */
 987         n=ssl3_get_message(s,
 988                 SSL3_ST_CR_KEY_EXCH_A,
 989                 SSL3_ST_CR_KEY_EXCH_B,
 990                 -1,
 991                 s->max_cert_list,
 992                 &ok);
 993
 994         if (!ok) return((int)n);
 995
 996         if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
 997                 {
 998                 s->s3->tmp.reuse_message=1;
 999                 return(1);
1000                 }
1001
1002         param=p=(unsigned char *)s->init_msg;
1003
1004         if (s->session->sess_cert != NULL)
1005                 {
1006 #ifndef OPENSSL_NO_RSA
1007                 if (s->session->sess_cert->peer_rsa_tmp != NULL)
1008                         {
1009                         RSA_free(s->session->sess_cert->peer_rsa_tmp);
1010                         s->session->sess_cert->peer_rsa_tmp=NULL;
1011                         }
1012 #endif
1013 #ifndef OPENSSL_NO_DH
1014                 if (s->session->sess_cert->peer_dh_tmp)
1015                         {
1016                         DH_free(s->session->sess_cert->peer_dh_tmp);
1017                         s->session->sess_cert->peer_dh_tmp=NULL;
1018                         }
1019 #endif
1020 #ifndef OPENSSL_NO_ECDH
1021                 if (s->session->sess_cert->peer_ecdh_tmp)
1022                         {
1023                         EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp);
1024                         s->session->sess_cert->peer_ecdh_tmp=NULL;
1025                         }
1026 #endif
1027                 }
1028         else
1029                 {
1030                 s->session->sess_cert=ssl_sess_cert_new();
1031                 }
1032
1033         param_len=0;
1034         alg=s->s3->tmp.new_cipher->algorithms;
1035         EVP_MD_CTX_init(&md_ctx);
1036
1037 #ifndef OPENSSL_NO_RSA
1038         if (alg & SSL_kRSA)
1039                 {
1040                 if ((rsa=RSA_new()) == NULL)
1041                         {
1042                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1043                         goto err;
1044                         }
1045                 n2s(p,i);
1046                 param_len=i+2;
1047                 if (param_len > n)
1048                         {
1049                         al=SSL_AD_DECODE_ERROR;
1050                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
1051                         goto f_err;
1052                         }
1053                 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
1054                         {
1055                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1056                         goto err;
1057                         }
1058                 p+=i;
1059
1060                 n2s(p,i);
1061                 param_len+=i+2;
1062                 if (param_len > n)
1063                         {
1064                         al=SSL_AD_DECODE_ERROR;
1065                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
1066                         goto f_err;
1067                         }
1068                 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
1069                         {
1070                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1071                         goto err;
1072                         }
1073                 p+=i;
1074                 n-=param_len;
1075
1076                 /* this should be because we are using an export cipher */
1077                 if (alg & SSL_aRSA)
1078                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1079                 else
1080                         {
1081                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1082                         goto err;
1083                         }
1084                 s->session->sess_cert->peer_rsa_tmp=rsa;
1085                 rsa=NULL;
1086                 }
1087 #else /* OPENSSL_NO_RSA */
1088         if (0)
1089                 ;
1090 #endif
1091 #ifndef OPENSSL_NO_DH
1092         else if (alg & SSL_kEDH)
1093                 {
1094                 if ((dh=DH_new()) == NULL)
1095                         {
1096                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
1097                         goto err;
1098                         }
1099                 n2s(p,i);
1100                 param_len=i+2;
1101                 if (param_len > n)
1102                         {
1103                         al=SSL_AD_DECODE_ERROR;
1104                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
1105                         goto f_err;
1106                         }
1107                 if (!(dh->p=BN_bin2bn(p,i,NULL)))
1108                         {
1109                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1110                         goto err;
1111                         }
1112                 p+=i;
1113
1114                 n2s(p,i);
1115                 param_len+=i+2;
1116                 if (param_len > n)
1117                         {
1118                         al=SSL_AD_DECODE_ERROR;
1119                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
1120                         goto f_err;
1121                         }
1122                 if (!(dh->g=BN_bin2bn(p,i,NULL)))
1123                         {
1124                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1125                         goto err;
1126                         }
1127                 p+=i;
1128
1129                 n2s(p,i);
1130                 param_len+=i+2;
1131                 if (param_len > n)
1132                         {
1133                         al=SSL_AD_DECODE_ERROR;
1134                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
1135                         goto f_err;
1136                         }
1137                 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
1138                         {
1139                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1140                         goto err;
1141                         }
1142                 p+=i;
1143                 n-=param_len;
1144
1145 #ifndef OPENSSL_NO_RSA
1146                 if (alg & SSL_aRSA)
1147                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1148 #else
1149                 if (0)
1150                         ;
1151 #endif
1152 #ifndef OPENSSL_NO_DSA
1153                 else if (alg & SSL_aDSS)
1154                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1155 #endif
1156                 /* else anonymous DH, so no certificate or pkey. */
1157
1158                 s->session->sess_cert->peer_dh_tmp=dh;
1159                 dh=NULL;
1160                 }
1161         else if ((alg & SSL_kDHr) || (alg & SSL_kDHd))
1162                 {
1163                 al=SSL_AD_ILLEGAL_PARAMETER;
1164                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1165                 goto f_err;
1166                 }
1167 #endif /* !OPENSSL_NO_DH */
1168
1169 #ifndef OPENSSL_NO_ECDH
1170         else if (alg & SSL_kECDHE)
1171                 {
1172                 if ((ecdh=EC_KEY_new()) == NULL)
1173                         {
1174                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1175                         goto err;
1176                         }
1177
1178                 /* Extract elliptic curve parameters and the
1179                  * server's ephemeral ECDH public key.
1180                  * Keep accumulating lengths of various components in
1181                  * param_len and make sure it never exceeds n.
1182                  */
1183
1184                 /* XXX: For now we only support named (not generic) curves
1185                  * and the ECParameters in this case is just two bytes.
1186                  */
1187                 param_len=2;
1188                 if ((param_len > n) ||
1189                     (*p != NAMED_CURVE_TYPE) ||
1190                     ((curve_nid = curve_id2nid(*(p + 1))) == 0))
1191                         {
1192                         al=SSL_AD_INTERNAL_ERROR;
1193                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
1194                         goto f_err;
1195                         }
1196
1197                 if (!(ecdh->group=EC_GROUP_new_by_nid(curve_nid)))
1198                         {
1199                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1200                         goto err;
1201                         }
1202
1203                 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1204                     (EC_GROUP_get_degree(ecdh->group) > 163))
1205                         {
1206                         al=SSL_AD_EXPORT_RESTRICTION;
1207                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1208                         goto f_err;
1209                         }
1210
1211                 p+=2;
1212
1213                 /* Next, get the encoded ECPoint */
1214                 if (((srvr_ecpoint = EC_POINT_new(ecdh->group)) == NULL) ||
1215                     ((bn_ctx = BN_CTX_new()) == NULL))
1216                         {
1217                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1218                         goto err;
1219                         }
1220
1221                 encoded_pt_len = *p;  /* length of encoded point */
1222                 p+=1;
1223                 param_len += (1 + encoded_pt_len);
1224                 if ((param_len > n) ||
1225                     (EC_POINT_oct2point(ecdh->group, srvr_ecpoint,
1226                         p, encoded_pt_len, bn_ctx) == 0))
1227                         {
1228                         al=SSL_AD_DECODE_ERROR;
1229                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_ECPOINT);
1230                         goto f_err;
1231                         }
1232
1233                 n-=param_len;
1234                 p+=encoded_pt_len;
1235
1236                 /* The ECC/TLS specification does not mention
1237                  * the use of DSA to sign ECParameters in the server
1238                  * key exchange message. We do support RSA and ECDSA.
1239                  */
1240                 if (0) ;
1241 #ifndef OPENSSL_NO_RSA
1242                 else if (alg & SSL_aRSA)
1243                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1244 #endif
1245 #ifndef OPENSSL_NO_ECDSA
1246                 else if (alg & SSL_aECDSA)
1247                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1248 #endif
1249                 /* else anonymous ECDH, so no certificate or pkey. */
1250                 ecdh->pub_key = srvr_ecpoint;
1251                 s->session->sess_cert->peer_ecdh_tmp=ecdh;
1252                 ecdh=NULL;
1253                 BN_CTX_free(bn_ctx);
1254                 srvr_ecpoint = NULL;
1255                 }
1256         else if (alg & SSL_kECDH)
1257                 {
1258                 al=SSL_AD_UNEXPECTED_MESSAGE;
1259                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1260                 goto f_err;
1261                 }
1262 #endif /* !OPENSSL_NO_ECDH */
1263         if (alg & SSL_aFZA)
1264                 {
1265                 al=SSL_AD_HANDSHAKE_FAILURE;
1266                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1267                 goto f_err;
1268                 }
1269
1270
1271         /* p points to the next byte, there are 'n' bytes left */
1272
1273         /* if it was signed, check the signature */
1274         if (pkey != NULL)
1275                 {
1276                 n2s(p,i);
1277                 n-=2;
1278                 j=EVP_PKEY_size(pkey);
1279
1280                 if ((i != n) || (n > j) || (n <= 0))
1281                         {
1282                         /* wrong packet length */
1283                         al=SSL_AD_DECODE_ERROR;
1284                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1285                         goto f_err;
1286                         }
1287
1288 #ifndef OPENSSL_NO_RSA
1289                 if (pkey->type == EVP_PKEY_RSA)
1290                         {
1291                         int num;
1292
1293                         j=0;
1294                         q=md_buf;
1295                         for (num=2; num > 0; num--)
1296                                 {
1297                                 EVP_DigestInit_ex(&md_ctx,(num == 2)
1298                                         ?s->ctx->md5:s->ctx->sha1, NULL);
1299                                 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1300                                 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1301                                 EVP_DigestUpdate(&md_ctx,param,param_len);
1302                                 EVP_DigestFinal_ex(&md_ctx,q,(unsigned int *)&i);
1303                                 q+=i;
1304                                 j+=i;
1305                                 }
1306                         i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
1307                                                                 pkey->pkey.rsa);
1308                         if (i < 0)
1309                                 {
1310                                 al=SSL_AD_DECRYPT_ERROR;
1311                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1312                                 goto f_err;
1313                                 }
1314                         if (i == 0)
1315                                 {
1316                                 /* bad signature */
1317                                 al=SSL_AD_DECRYPT_ERROR;
1318                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1319                                 goto f_err;
1320                                 }
1321                         }
1322                 else
1323 #endif
1324 #ifndef OPENSSL_NO_DSA
1325                         if (pkey->type == EVP_PKEY_DSA)
1326                         {
1327                         /* lets do DSS */
1328                         EVP_VerifyInit_ex(&md_ctx,EVP_dss1(), NULL);
1329                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1330                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1331                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1332                         if (!EVP_VerifyFinal(&md_ctx,p,(int)n,pkey))
1333                                 {
1334                                 /* bad signature */
1335                                 al=SSL_AD_DECRYPT_ERROR;
1336                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1337                                 goto f_err;
1338                                 }
1339                         }
1340                 else
1341 #endif
1342 #ifndef OPENSSL_NO_ECDSA
1343                         if (pkey->type == EVP_PKEY_EC)
1344                         {
1345                         /* let's do ECDSA */
1346                         EVP_VerifyInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1347                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1348                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1349                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1350                         if (!EVP_VerifyFinal(&md_ctx,p,(int)n,pkey))
1351                                 {
1352                                 /* bad signature */
1353                                 al=SSL_AD_DECRYPT_ERROR;
1354                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1355                                 goto f_err;
1356                                 }
1357                         }
1358                 else
1359 #endif
1360                         {
1361                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1362                         goto err;
1363                         }
1364                 }
1365         else
1366                 {
1367                 /* still data left over */
1368                 if (!(alg & SSL_aNULL))
1369                         {
1370                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1371                         goto err;
1372                         }
1373                 if (n != 0)
1374                         {
1375                         al=SSL_AD_DECODE_ERROR;
1376                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
1377                         goto f_err;
1378                         }
1379                 }
1380         EVP_PKEY_free(pkey);
1381         EVP_MD_CTX_cleanup(&md_ctx);
1382         return(1);
1383 f_err:
1384         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1385 err:
1386         EVP_PKEY_free(pkey);
1387 #ifndef OPENSSL_NO_RSA
1388         if (rsa != NULL)
1389                 RSA_free(rsa);
1390 #endif
1391 #ifndef OPENSSL_NO_DH
1392         if (dh != NULL)
1393                 DH_free(dh);
1394 #endif
1395 #ifndef OPENSSL_NO_ECDH
1396         BN_CTX_free(bn_ctx);
1397         EC_POINT_free(srvr_ecpoint);
1398         if (ecdh != NULL)
1399                 EC_KEY_free(ecdh);
1400 #endif
1401         EVP_MD_CTX_cleanup(&md_ctx);
1402         return(-1);
1403         }
1404
1405 static int ssl3_get_certificate_request(SSL *s)
1406         {
1407         int ok,ret=0;
1408         unsigned long n,nc,l;
1409         unsigned int llen,ctype_num,i;
1410         X509_NAME *xn=NULL;
1411         unsigned char *p,*d,*q;
1412         STACK_OF(X509_NAME) *ca_sk=NULL;
1413
1414         n=ssl3_get_message(s,
1415                 SSL3_ST_CR_CERT_REQ_A,
1416                 SSL3_ST_CR_CERT_REQ_B,
1417                 -1,
1418                 s->max_cert_list,
1419                 &ok);
1420
1421         if (!ok) return((int)n);
1422
1423         s->s3->tmp.cert_req=0;
1424
1425         if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
1426                 {
1427                 s->s3->tmp.reuse_message=1;
1428                 return(1);
1429                 }
1430
1431         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
1432                 {
1433                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1434                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
1435                 goto err;
1436                 }
1437
1438         /* TLS does not like anon-DH with client cert */
1439         if (s->version > SSL3_VERSION)
1440                 {
1441                 l=s->s3->tmp.new_cipher->algorithms;
1442                 if (l & SSL_aNULL)
1443                         {
1444                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1445                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
1446                         goto err;
1447                         }
1448                 }
1449
1450         d=p=(unsigned char *)s->init_msg;
1451
1452         if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
1453                 {
1454                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1455                 goto err;
1456                 }
1457
1458         /* get the certificate types */
1459         ctype_num= *(p++);
1460         if (ctype_num > SSL3_CT_NUMBER)
1461                 ctype_num=SSL3_CT_NUMBER;
1462         for (i=0; i<ctype_num; i++)
1463                 s->s3->tmp.ctype[i]= p[i];
1464         p+=ctype_num;
1465
1466         /* get the CA RDNs */
1467         n2s(p,llen);
1468 #if 0
1469 {
1470 FILE *out;
1471 out=fopen("/tmp/vsign.der","w");
1472 fwrite(p,1,llen,out);
1473 fclose(out);
1474 }
1475 #endif
1476
1477         if ((llen+ctype_num+2+1) != n)
1478                 {
1479                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1480                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
1481                 goto err;
1482                 }
1483
1484         for (nc=0; nc<llen; )
1485                 {
1486                 n2s(p,l);
1487                 if ((l+nc+2) > llen)
1488                         {
1489                         if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1490                                 goto cont; /* netscape bugs */
1491                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1492                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
1493                         goto err;
1494                         }
1495
1496                 q=p;
1497
1498                 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
1499                         {
1500                         /* If netscape tolerance is on, ignore errors */
1501                         if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
1502                                 goto cont;
1503                         else
1504                                 {
1505                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1506                                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
1507                                 goto err;
1508                                 }
1509                         }
1510
1511                 if (q != (p+l))
1512                         {
1513                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1514                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
1515                         goto err;
1516                         }
1517                 if (!sk_X509_NAME_push(ca_sk,xn))
1518                         {
1519                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1520                         goto err;
1521                         }
1522
1523                 p+=l;
1524                 nc+=l+2;
1525                 }
1526
1527         if (0)
1528                 {
1529 cont:
1530                 ERR_clear_error();
1531                 }
1532
1533         /* we should setup a certificate to return.... */
1534         s->s3->tmp.cert_req=1;
1535         s->s3->tmp.ctype_num=ctype_num;
1536         if (s->s3->tmp.ca_names != NULL)
1537                 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
1538         s->s3->tmp.ca_names=ca_sk;
1539         ca_sk=NULL;
1540
1541         ret=1;
1542 err:
1543         if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
1544         return(ret);
1545         }
1546
1547 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
1548         {
1549         return(X509_NAME_cmp(*a,*b));
1550         }
1551
1552 static int ssl3_get_server_done(SSL *s)
1553         {
1554         int ok,ret=0;
1555         long n;
1556
1557         n=ssl3_get_message(s,
1558                 SSL3_ST_CR_SRVR_DONE_A,
1559                 SSL3_ST_CR_SRVR_DONE_B,
1560                 SSL3_MT_SERVER_DONE,
1561                 30, /* should be very small, like 0 :-) */
1562                 &ok);
1563
1564         if (!ok) return((int)n);
1565         if (n > 0)
1566                 {
1567                 /* should contain no data */
1568                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1569                 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
1570                 return -1;
1571                 }
1572         ret=1;
1573         return(ret);
1574         }
1575
1576
1577 static const int KDF1_SHA1_len = 20;
1578 static void *KDF1_SHA1(void *in, size_t inlen, void *out, size_t outlen)
1579         {
1580 #ifndef OPENSSL_NO_SHA
1581         if (outlen != SHA_DIGEST_LENGTH)
1582                 return NULL;
1583         return SHA1(in, inlen, out);
1584 #else
1585         return NULL;
1586 #endif
1587         }
1588
1589 static int ssl3_send_client_key_exchange(SSL *s)
1590         {
1591         unsigned char *p,*d;
1592         int n;
1593         unsigned long l;
1594 #ifndef OPENSSL_NO_RSA
1595         unsigned char *q;
1596         EVP_PKEY *pkey=NULL;
1597 #endif
1598 #ifndef OPENSSL_NO_KRB5
1599         KSSL_ERR kssl_err;
1600 #endif /* OPENSSL_NO_KRB5 */
1601 #ifndef OPENSSL_NO_ECDH
1602         EC_KEY *clnt_ecdh = NULL;
1603         EC_POINT *srvr_ecpoint = NULL;
1604         EVP_PKEY *srvr_pub_pkey = NULL;
1605         unsigned char *encodedPoint = NULL;
1606         int encoded_pt_len = 0;
1607         BN_CTX * bn_ctx = NULL;
1608 #endif
1609
1610         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
1611                 {
1612                 d=(unsigned char *)s->init_buf->data;
1613                 p= &(d[4]);
1614
1615                 l=s->s3->tmp.new_cipher->algorithms;
1616
1617                 /* Fool emacs indentation */
1618                 if (0) {}
1619 #ifndef OPENSSL_NO_RSA
1620                 else if (l & SSL_kRSA)
1621                         {
1622                         RSA *rsa;
1623                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1624
1625                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
1626                                 rsa=s->session->sess_cert->peer_rsa_tmp;
1627                         else
1628                                 {
1629                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1630                                 if ((pkey == NULL) ||
1631                                         (pkey->type != EVP_PKEY_RSA) ||
1632                                         (pkey->pkey.rsa == NULL))
1633                                         {
1634                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1635                                         goto err;
1636                                         }
1637                                 rsa=pkey->pkey.rsa;
1638                                 EVP_PKEY_free(pkey);
1639                                 }
1640
1641                         tmp_buf[0]=s->client_version>>8;
1642                         tmp_buf[1]=s->client_version&0xff;
1643                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
1644                                         goto err;
1645
1646                         s->session->master_key_length=sizeof tmp_buf;
1647
1648                         q=p;
1649                         /* Fix buf for TLS and beyond */
1650                         if (s->version > SSL3_VERSION)
1651                                 p+=2;
1652                         n=RSA_public_encrypt(sizeof tmp_buf,
1653                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
1654 #ifdef PKCS1_CHECK
1655                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
1656                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
1657 #endif
1658                         if (n <= 0)
1659                                 {
1660                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
1661                                 goto err;
1662                                 }
1663
1664                         /* Fix buf for TLS and beyond */
1665                         if (s->version > SSL3_VERSION)
1666                                 {
1667                                 s2n(n,q);
1668                                 n+=2;
1669                                 }
1670
1671                         s->session->master_key_length=
1672                                 s->method->ssl3_enc->generate_master_secret(s,
1673                                         s->session->master_key,
1674                                         tmp_buf,sizeof tmp_buf);
1675                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
1676                         }
1677 #endif
1678 #ifndef OPENSSL_NO_KRB5
1679                 else if (l & SSL_kKRB5)
1680                         {
1681                         krb5_error_code krb5rc;
1682                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
1683                         /*  krb5_data   krb5_ap_req;  */
1684                         krb5_data       *enc_ticket;
1685                         krb5_data       authenticator, *authp = NULL;
1686                         EVP_CIPHER_CTX  ciph_ctx;
1687                         EVP_CIPHER      *enc = NULL;
1688                         unsigned char   iv[EVP_MAX_IV_LENGTH];
1689                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1690                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH
1691                                                 + EVP_MAX_IV_LENGTH];
1692                         int             padl, outl = sizeof(epms);
1693
1694                         EVP_CIPHER_CTX_init(&ciph_ctx);
1695
1696 #ifdef KSSL_DEBUG
1697                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
1698                                 l, SSL_kKRB5);
1699 #endif  /* KSSL_DEBUG */
1700
1701                         authp = NULL;
1702 #ifdef KRB5SENDAUTH
1703                         if (KRB5SENDAUTH)  authp = &authenticator;
1704 #endif  /* KRB5SENDAUTH */
1705
1706                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
1707                                 &kssl_err);
1708                         enc = kssl_map_enc(kssl_ctx->enctype);
1709                         if (enc == NULL)
1710                             goto err;
1711 #ifdef KSSL_DEBUG
1712                         {
1713                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
1714                         if (krb5rc && kssl_err.text)
1715                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
1716                         }
1717 #endif  /* KSSL_DEBUG */
1718
1719                         if (krb5rc)
1720                                 {
1721                                 ssl3_send_alert(s,SSL3_AL_FATAL,
1722                                                 SSL_AD_HANDSHAKE_FAILURE);
1723                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1724                                                 kssl_err.reason);
1725                                 goto err;
1726                                 }
1727
1728                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
1729                         **  in place of RFC 2712 KerberosWrapper, as in:
1730                         **
1731                         **  Send ticket (copy to *p, set n = length)
1732                         **  n = krb5_ap_req.length;
1733                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
1734                         **  if (krb5_ap_req.data)
1735                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
1736                         **
1737                         **  Now using real RFC 2712 KerberosWrapper
1738                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
1739                         **  Note: 2712 "opaque" types are here replaced
1740                         **  with a 2-byte length followed by the value.
1741                         **  Example:
1742                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
1743                         **  Where "xx xx" = length bytes.  Shown here with
1744                         **  optional authenticator omitted.
1745                         */
1746
1747                         /*  KerberosWrapper.Ticket              */
1748                         s2n(enc_ticket->length,p);
1749                         memcpy(p, enc_ticket->data, enc_ticket->length);
1750                         p+= enc_ticket->length;
1751                         n = enc_ticket->length + 2;
1752
1753                         /*  KerberosWrapper.Authenticator       */
1754                         if (authp  &&  authp->length)
1755                                 {
1756                                 s2n(authp->length,p);
1757                                 memcpy(p, authp->data, authp->length);
1758                                 p+= authp->length;
1759                                 n+= authp->length + 2;
1760
1761                                 free(authp->data);
1762                                 authp->data = NULL;
1763                                 authp->length = 0;
1764                                 }
1765                         else
1766                                 {
1767                                 s2n(0,p);/*  null authenticator length  */
1768                                 n+=2;
1769                                 }
1770
1771                         if (RAND_bytes(tmp_buf,sizeof tmp_buf) <= 0)
1772                             goto err;
1773
1774                         /*  20010420 VRS.  Tried it this way; failed.
1775                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
1776                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
1777                         **                              kssl_ctx->length);
1778                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
1779                         */
1780
1781                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
1782                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
1783                                 kssl_ctx->key,iv);
1784                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
1785                                 sizeof tmp_buf);
1786                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
1787                         outl += padl;
1788                         if (outl > sizeof epms)
1789                                 {
1790                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1791                                 goto err;
1792                                 }
1793                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
1794
1795                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
1796                         s2n(outl,p);
1797                         memcpy(p, epms, outl);
1798                         p+=outl;
1799                         n+=outl + 2;
1800
1801                         s->session->master_key_length=
1802                                 s->method->ssl3_enc->generate_master_secret(s,
1803                                         s->session->master_key,
1804                                         tmp_buf, sizeof tmp_buf);
1805
1806                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
1807                         OPENSSL_cleanse(epms, outl);
1808                         }
1809 #endif
1810 #ifndef OPENSSL_NO_DH
1811                 else if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1812                         {
1813                         DH *dh_srvr,*dh_clnt;
1814
1815                         if (s->session->sess_cert->peer_dh_tmp != NULL)
1816                                 dh_srvr=s->session->sess_cert->peer_dh_tmp;
1817                         else
1818                                 {
1819                                 /* we get them from the cert */
1820                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1821                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
1822                                 goto err;
1823                                 }
1824
1825                         /* generate a new random key */
1826                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
1827                                 {
1828                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1829                                 goto err;
1830                                 }
1831                         if (!DH_generate_key(dh_clnt))
1832                                 {
1833                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1834                                 goto err;
1835                                 }
1836
1837                         /* use the 'p' output buffer for the DH key, but
1838                          * make sure to clear it out afterwards */
1839
1840                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
1841
1842                         if (n <= 0)
1843                                 {
1844                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1845                                 goto err;
1846                                 }
1847
1848                         /* generate master key from the result */
1849                         s->session->master_key_length=
1850                                 s->method->ssl3_enc->generate_master_secret(s,
1851                                         s->session->master_key,p,n);
1852                         /* clean up */
1853                         memset(p,0,n);
1854
1855                         /* send off the data */
1856                         n=BN_num_bytes(dh_clnt->pub_key);
1857                         s2n(n,p);
1858                         BN_bn2bin(dh_clnt->pub_key,p);
1859                         n+=2;
1860
1861                         DH_free(dh_clnt);
1862
1863                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
1864                         }
1865 #endif
1866
1867 #ifndef OPENSSL_NO_ECDH
1868                 else if ((l & SSL_kECDH) || (l & SSL_kECDHE))
1869                         {
1870                         EC_GROUP *srvr_group = NULL;
1871                         int ecdh_clnt_cert = 0;
1872                         int field_size = 0;
1873
1874                         /* Did we send out the client's
1875                          * ECDH share for use in premaster
1876                          * computation as part of client certificate?
1877                          * If so, set ecdh_clnt_cert to 1.
1878                          */
1879                         if ((l & SSL_kECDH) && (s->cert != NULL))
1880                                 {
1881                                 /* XXX: For now, we do not support client
1882                                  * authentication using ECDH certificates.
1883                                  * To add such support, one needs to add
1884                                  * code that checks for appropriate
1885                                  * conditions and sets ecdh_clnt_cert to 1.
1886                                  * For example, the cert have an ECC
1887                                  * key on the same curve as the server's
1888                                  * and the key should be authorized for
1889                                  * key agreement.
1890                                  *
1891                                  * One also needs to add code in ssl3_connect
1892                                  * to skip sending the certificate verify
1893                                  * message.
1894                                  *
1895                                  * if ((s->cert->key->privatekey != NULL) &&
1896                                  *     (s->cert->key->privatekey->type ==
1897                                  *      EVP_PKEY_EC) && ...)
1898                                  * ecdh_clnt_cert = 1;
1899                                  */
1900                                 }
1901
1902                         if (s->session->sess_cert->peer_ecdh_tmp != NULL)
1903                                 {
1904                                 srvr_group = s->session->sess_cert-> \
1905                                     peer_ecdh_tmp->group;
1906                                 srvr_ecpoint = s->session->sess_cert-> \
1907                                     peer_ecdh_tmp->pub_key;
1908                                 }
1909                         else
1910                                 {
1911                                 /* Get the Server Public Key from Cert */
1912                                 srvr_pub_pkey = X509_get_pubkey(s->session-> \
1913                                     sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1914                                 if ((srvr_pub_pkey == NULL) ||
1915                                     (srvr_pub_pkey->type != EVP_PKEY_EC) ||
1916                                     (srvr_pub_pkey->pkey.eckey == NULL))
1917                                         {
1918                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1919                                             ERR_R_INTERNAL_ERROR);
1920                                         goto err;
1921                                         }
1922
1923                                 srvr_group = srvr_pub_pkey->pkey.eckey->group;
1924                                 srvr_ecpoint =
1925                                     srvr_pub_pkey->pkey.eckey->pub_key;
1926                                 }
1927
1928                         if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
1929                                 {
1930                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1931                                     ERR_R_INTERNAL_ERROR);
1932                                 goto err;
1933                                 }
1934
1935                         if ((clnt_ecdh=EC_KEY_new()) == NULL)
1936                                 {
1937                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1938                                 goto err;
1939                                 }
1940
1941                         clnt_ecdh->group = srvr_group;
1942                         if (ecdh_clnt_cert)
1943                                 {
1944                                 /* Reuse key info from our certificate
1945                                  * We only need our private key to perform
1946                                  * the ECDH computation.
1947                                  */
1948                                 clnt_ecdh->priv_key = BN_dup(s->cert->key-> \
1949                                     privatekey->pkey.eckey->priv_key);
1950                                 }
1951                         else
1952                                 {
1953                                 /* Generate a new ECDH key pair */
1954                                 if (!(EC_KEY_generate_key(clnt_ecdh)))
1955                                         {
1956                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
1957                                         goto err;
1958                                         }
1959                                 }
1960
1961                         /* use the 'p' output buffer for the ECDH key, but
1962                          * make sure to clear it out afterwards
1963                          */
1964
1965                         field_size = EC_GROUP_get_degree(clnt_ecdh->group);
1966                         if (field_size <= 0)
1967                                 {
1968                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1969                                        ERR_R_ECDH_LIB);
1970                                 goto err;
1971                                 }
1972                         /* If field size is not more than 24 octets, then use SHA-1 hash of result;
1973                          * otherwise, use result (see section 4.8 of draft-ietf-tls-ecc-03.txt;
1974                          * this is new with this version of the Internet Draft).
1975                          */
1976                         if (field_size <= 24 * 8)
1977                                 n=ECDH_compute_key(p, KDF1_SHA1_len, srvr_ecpoint, clnt_ecdh, KDF1_SHA1);
1978                         else
1979                                 n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
1980                         if (n <= 0)
1981                                 {
1982                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1983                                        ERR_R_ECDH_LIB);
1984                                 goto err;
1985                                 }
1986
1987                         /* generate master key from the result */
1988                         s->session->master_key_length = s->method->ssl3_enc \
1989                             -> generate_master_secret(s,
1990                                 s->session->master_key,
1991                                 p, n);
1992
1993                         memset(p, 0, n); /* clean up */
1994
1995                         if (ecdh_clnt_cert)
1996                                 {
1997                                 /* Send empty client key exch message */
1998                                 n = 0;
1999                                 }
2000                         else
2001                                 {
2002                                 /* First check the size of encoding and
2003                                  * allocate memory accordingly.
2004                                  */
2005                                 encoded_pt_len =
2006                                     EC_POINT_point2oct(clnt_ecdh->group,
2007                                         clnt_ecdh->pub_key,
2008                                         POINT_CONVERSION_UNCOMPRESSED,
2009                                         NULL, 0, NULL);
2010
2011                                 encodedPoint = (unsigned char *)
2012                                     OPENSSL_malloc(encoded_pt_len *
2013                                         sizeof(unsigned char));
2014                                 bn_ctx = BN_CTX_new();
2015                                 if ((encodedPoint == NULL) ||
2016                                     (bn_ctx == NULL))
2017                                         {
2018                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2019                                         goto err;
2020                                         }
2021
2022                                 /* Encode the public key */
2023                                 n = EC_POINT_point2oct(clnt_ecdh->group,
2024                                     clnt_ecdh->pub_key,
2025                                     POINT_CONVERSION_UNCOMPRESSED,
2026                                     encodedPoint, encoded_pt_len, bn_ctx);
2027
2028                                 *p = n; /* length of encoded point */
2029                                 /* Encoded point will be copied here */
2030                                 p += 1;
2031                                 /* copy the point */
2032                                 memcpy((unsigned char *)p, encodedPoint, n);
2033                                 /* increment n to account for length field */
2034                                 n += 1;
2035                                 }
2036
2037                         /* Free allocated memory */
2038                         BN_CTX_free(bn_ctx);
2039                         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2040                         if (clnt_ecdh != NULL)
2041                                 {
2042                                  /* group is shared */
2043                                  clnt_ecdh->group = NULL;
2044                                  EC_KEY_free(clnt_ecdh);
2045                                 }
2046                         EVP_PKEY_free(srvr_pub_pkey);
2047                         }
2048 #endif /* !OPENSSL_NO_ECDH */
2049                 else
2050                         {
2051                         ssl3_send_alert(s, SSL3_AL_FATAL,
2052                             SSL_AD_HANDSHAKE_FAILURE);
2053                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2054                             ERR_R_INTERNAL_ERROR);
2055                         goto err;
2056                         }
2057
2058                 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
2059                 l2n3(n,d);
2060
2061                 s->state=SSL3_ST_CW_KEY_EXCH_B;
2062                 /* number of bytes to write */
2063                 s->init_num=n+4;
2064                 s->init_off=0;
2065                 }
2066
2067         /* SSL3_ST_CW_KEY_EXCH_B */
2068         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2069 err:
2070 #ifndef OPENSSL_NO_ECDH
2071         BN_CTX_free(bn_ctx);
2072         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2073         if (clnt_ecdh != NULL)
2074                 {
2075                 /* group is shared */
2076                 clnt_ecdh->group = NULL;
2077                 EC_KEY_free(clnt_ecdh);
2078                 }
2079         EVP_PKEY_free(srvr_pub_pkey);
2080 #endif
2081         return(-1);
2082         }
2083
2084 static int ssl3_send_client_verify(SSL *s)
2085         {
2086         unsigned char *p,*d;
2087         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
2088         EVP_PKEY *pkey;
2089 #ifndef OPENSSL_NO_RSA
2090         unsigned u=0;
2091 #endif
2092         unsigned long n;
2093 #ifndef OPENSSL_NO_DSA
2094         int j;
2095 #endif
2096
2097         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
2098                 {
2099                 d=(unsigned char *)s->init_buf->data;
2100                 p= &(d[4]);
2101                 pkey=s->cert->key->privatekey;
2102
2103                 s->method->ssl3_enc->cert_verify_mac(s,&(s->s3->finish_dgst2),
2104                         &(data[MD5_DIGEST_LENGTH]));
2105
2106 #ifndef OPENSSL_NO_RSA
2107                 if (pkey->type == EVP_PKEY_RSA)
2108                         {
2109                         s->method->ssl3_enc->cert_verify_mac(s,
2110                                 &(s->s3->finish_dgst1),&(data[0]));
2111                         if (RSA_sign(NID_md5_sha1, data,
2112                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
2113                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
2114                                 {
2115                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
2116                                 goto err;
2117                                 }
2118                         s2n(u,p);
2119                         n=u+2;
2120                         }
2121                 else
2122 #endif
2123 #ifndef OPENSSL_NO_DSA
2124                         if (pkey->type == EVP_PKEY_DSA)
2125                         {
2126                         if (!DSA_sign(pkey->save_type,
2127                                 &(data[MD5_DIGEST_LENGTH]),
2128                                 SHA_DIGEST_LENGTH,&(p[2]),
2129                                 (unsigned int *)&j,pkey->pkey.dsa))
2130                                 {
2131                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
2132                                 goto err;
2133                                 }
2134                         s2n(j,p);
2135                         n=j+2;
2136                         }
2137                 else
2138 #endif
2139 #ifndef OPENSSL_NO_ECDSA
2140                         if (pkey->type == EVP_PKEY_EC)
2141                         {
2142                         if (!ECDSA_sign(pkey->save_type,
2143                                 &(data[MD5_DIGEST_LENGTH]),
2144                                 SHA_DIGEST_LENGTH,&(p[2]),
2145                                 (unsigned int *)&j,pkey->pkey.eckey))
2146                                 {
2147                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
2148                                     ERR_R_ECDSA_LIB);
2149                                 goto err;
2150                                 }
2151                         s2n(j,p);
2152                         n=j+2;
2153                         }
2154                 else
2155 #endif
2156                         {
2157                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
2158                         goto err;
2159                         }
2160                 *(d++)=SSL3_MT_CERTIFICATE_VERIFY;
2161                 l2n3(n,d);
2162
2163                 s->state=SSL3_ST_CW_CERT_VRFY_B;
2164                 s->init_num=(int)n+4;
2165                 s->init_off=0;
2166                 }
2167         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2168 err:
2169         return(-1);
2170         }
2171
2172 static int ssl3_send_client_certificate(SSL *s)
2173         {
2174         X509 *x509=NULL;
2175         EVP_PKEY *pkey=NULL;
2176         int i;
2177         unsigned long l;
2178
2179         if (s->state == SSL3_ST_CW_CERT_A)
2180                 {
2181                 if ((s->cert == NULL) ||
2182                         (s->cert->key->x509 == NULL) ||
2183                         (s->cert->key->privatekey == NULL))
2184                         s->state=SSL3_ST_CW_CERT_B;
2185                 else
2186                         s->state=SSL3_ST_CW_CERT_C;
2187                 }
2188
2189         /* We need to get a client cert */
2190         if (s->state == SSL3_ST_CW_CERT_B)
2191                 {
2192                 /* If we get an error, we need to
2193                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
2194                  * We then get retied later */
2195                 i=0;
2196                 if (s->ctx->client_cert_cb != NULL)
2197                         i=s->ctx->client_cert_cb(s,&(x509),&(pkey));
2198                 if (i < 0)
2199                         {
2200                         s->rwstate=SSL_X509_LOOKUP;
2201                         return(-1);
2202                         }
2203                 s->rwstate=SSL_NOTHING;
2204                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
2205                         {
2206                         s->state=SSL3_ST_CW_CERT_B;
2207                         if (    !SSL_use_certificate(s,x509) ||
2208                                 !SSL_use_PrivateKey(s,pkey))
2209                                 i=0;
2210                         }
2211                 else if (i == 1)
2212                         {
2213                         i=0;
2214                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
2215                         }
2216
2217                 if (x509 != NULL) X509_free(x509);
2218                 if (pkey != NULL) EVP_PKEY_free(pkey);
2219                 if (i == 0)
2220                         {
2221                         if (s->version == SSL3_VERSION)
2222                                 {
2223                                 s->s3->tmp.cert_req=0;
2224                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
2225                                 return(1);
2226                                 }
2227                         else
2228                                 {
2229                                 s->s3->tmp.cert_req=2;
2230                                 }
2231                         }
2232
2233                 /* Ok, we have a cert */
2234                 s->state=SSL3_ST_CW_CERT_C;
2235                 }
2236
2237         if (s->state == SSL3_ST_CW_CERT_C)
2238                 {
2239                 s->state=SSL3_ST_CW_CERT_D;
2240                 l=ssl3_output_cert_chain(s,
2241                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
2242                 s->init_num=(int)l;
2243                 s->init_off=0;
2244                 }
2245         /* SSL3_ST_CW_CERT_D */
2246         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2247         }
2248
2249 #define has_bits(i,m)   (((i)&(m)) == (m))
2250
2251 static int ssl3_check_cert_and_algorithm(SSL *s)
2252         {
2253         int i,idx;
2254         long algs;
2255         EVP_PKEY *pkey=NULL;
2256         SESS_CERT *sc;
2257 #ifndef OPENSSL_NO_RSA
2258         RSA *rsa;
2259 #endif
2260 #ifndef OPENSSL_NO_DH
2261         DH *dh;
2262 #endif
2263
2264         sc=s->session->sess_cert;
2265
2266         if (sc == NULL)
2267                 {
2268                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,ERR_R_INTERNAL_ERROR);
2269                 goto err;
2270                 }
2271
2272         algs=s->s3->tmp.new_cipher->algorithms;
2273
2274         /* we don't have a certificate */
2275         if (algs & (SSL_aDH|SSL_aNULL|SSL_aKRB5))
2276                 return(1);
2277
2278 #ifndef OPENSSL_NO_RSA
2279         rsa=s->session->sess_cert->peer_rsa_tmp;
2280 #endif
2281 #ifndef OPENSSL_NO_DH
2282         dh=s->session->sess_cert->peer_dh_tmp;
2283 #endif
2284
2285         /* This is the passed certificate */
2286
2287         idx=sc->peer_cert_type;
2288 #ifndef OPENSSL_NO_ECDH
2289         if (idx == SSL_PKEY_ECC)
2290                 {
2291                 if (check_srvr_ecc_cert_and_alg(sc->peer_pkeys[idx].x509,
2292                     s->s3->tmp.new_cipher) == 0)
2293                         { /* check failed */
2294                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_BAD_ECC_CERT);
2295                         goto f_err;
2296                         }
2297                 else
2298                         {
2299                         return 1;
2300                         }
2301                 }
2302 #endif
2303         pkey=X509_get_pubkey(sc->peer_pkeys[idx].x509);
2304         i=X509_certificate_type(sc->peer_pkeys[idx].x509,pkey);
2305         EVP_PKEY_free(pkey);
2306
2307
2308         /* Check that we have a certificate if we require one */
2309         if ((algs & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
2310                 {
2311                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
2312                 goto f_err;
2313                 }
2314 #ifndef OPENSSL_NO_DSA
2315         else if ((algs & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
2316                 {
2317                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
2318                 goto f_err;
2319                 }
2320 #endif
2321 #ifndef OPENSSL_NO_RSA
2322         if ((algs & SSL_kRSA) &&
2323                 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
2324                 {
2325                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
2326                 goto f_err;
2327                 }
2328 #endif
2329 #ifndef OPENSSL_NO_DH
2330         if ((algs & SSL_kEDH) &&
2331                 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
2332                 {
2333                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
2334                 goto f_err;
2335                 }
2336         else if ((algs & SSL_kDHr) && !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
2337                 {
2338                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
2339                 goto f_err;
2340                 }
2341 #ifndef OPENSSL_NO_DSA
2342         else if ((algs & SSL_kDHd) && !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
2343                 {
2344                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
2345                 goto f_err;
2346                 }
2347 #endif
2348 #endif
2349
2350         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i,EVP_PKT_EXP))
2351                 {
2352 #ifndef OPENSSL_NO_RSA
2353                 if (algs & SSL_kRSA)
2354                         {
2355                         if (rsa == NULL
2356                             || RSA_size(rsa)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
2357                                 {
2358                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
2359                                 goto f_err;
2360                                 }
2361                         }
2362                 else
2363 #endif
2364 #ifndef OPENSSL_NO_DH
2365                         if (algs & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2366                             {
2367                             if (dh == NULL
2368                                 || DH_size(dh)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
2369                                 {
2370                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
2371                                 goto f_err;
2372                                 }
2373                         }
2374                 else
2375 #endif
2376                         {
2377                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
2378                         goto f_err;
2379                         }
2380                 }
2381         return(1);
2382 f_err:
2383         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
2384 err:
2385         return(0);
2386         }
2387
2388
2389 #ifndef OPENSSL_NO_ECDH
2390 /* This is the complement of nid2curve_id in s3_srvr.c. */
2391 static int curve_id2nid(int curve_id)
2392 {
2393         /* ECC curves from draft-ietf-tls-ecc-01.txt (Mar 15, 2001)
2394          * (no changes in draft-ietf-tls-ecc-03.txt [June 2003]) */
2395         static int nid_list[26] =
2396         {
2397                 0,
2398                 NID_sect163k1, /* sect163k1 (1) */
2399                 NID_sect163r1, /* sect163r1 (2) */
2400                 NID_sect163r2, /* sect163r2 (3) */
2401                 NID_sect193r1, /* sect193r1 (4) */
2402                 NID_sect193r2, /* sect193r2 (5) */
2403                 NID_sect233k1, /* sect233k1 (6) */
2404                 NID_sect233r1, /* sect233r1 (7) */
2405                 NID_sect239k1, /* sect239k1 (8) */
2406                 NID_sect283k1, /* sect283k1 (9) */
2407                 NID_sect283r1, /* sect283r1 (10) */
2408                 NID_sect409k1, /* sect409k1 (11) */
2409                 NID_sect409r1, /* sect409r1 (12) */
2410                 NID_sect571k1, /* sect571k1 (13) */
2411                 NID_sect571r1, /* sect571r1 (14) */
2412                 NID_secp160k1, /* secp160k1 (15) */
2413                 NID_secp160r1, /* secp160r1 (16) */
2414                 NID_secp160r2, /* secp160r2 (17) */
2415                 NID_secp192k1, /* secp192k1 (18) */
2416                 NID_X9_62_prime192v1, /* secp192r1 (19) */
2417                 NID_secp224k1, /* secp224k1 (20) */
2418                 NID_secp224r1, /* secp224r1 (21) */
2419                 NID_secp256k1, /* secp256k1 (22) */
2420                 NID_X9_62_prime256v1, /* secp256r1 (23) */
2421                 NID_secp384r1, /* secp384r1 (24) */
2422                 NID_secp521r1  /* secp521r1 (25) */
2423         };
2424
2425         if ((curve_id < 1) || (curve_id > 25)) return 0;
2426
2427         return nid_list[curve_id];
2428 }
2429 #endif