ssl/s3_clnt.c

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