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) 1998-2006 The OpenSSL Project.  All rights reserved.
  60  *
  61  * Redistribution and use in source and binary forms, with or without
  62  * modification, are permitted provided that the following conditions
  63  * are met:
  64  *
  65  * 1. Redistributions of source code must retain the above copyright
  66  *    notice, this list of conditions and the following disclaimer.
  67  *
  68  * 2. Redistributions in binary form must reproduce the above copyright
  69  *    notice, this list of conditions and the following disclaimer in
  70  *    the documentation and/or other materials provided with the
  71  *    distribution.
  72  *
  73  * 3. All advertising materials mentioning features or use of this
  74  *    software must display the following acknowledgment:
  75  *    "This product includes software developed by the OpenSSL Project
  76  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  77  *
  78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  79  *    endorse or promote products derived from this software without
  80  *    prior written permission. For written permission, please contact
  81  *    openssl-core@openssl.org.
  82  *
  83  * 5. Products derived from this software may not be called "OpenSSL"
  84  *    nor may "OpenSSL" appear in their names without prior written
  85  *    permission of the OpenSSL Project.
  86  *
  87  * 6. Redistributions of any form whatsoever must retain the following
  88  *    acknowledgment:
  89  *    "This product includes software developed by the OpenSSL Project
  90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  91  *
  92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  95  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 103  * OF THE POSSIBILITY OF SUCH DAMAGE.
 104  * ====================================================================
 105  *
 106  * This product includes cryptographic software written by Eric Young
 107  * (eay@cryptsoft.com).  This product includes software written by Tim
 108  * Hudson (tjh@cryptsoft.com).
 109  *
 110  */
 111 /* ====================================================================
 112  * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
 113  *
 114  * Portions of the attached software ("Contribution") are developed by
 115  * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
 116  *
 117  * The Contribution is licensed pursuant to the OpenSSL open source
 118  * license provided above.
 119  *
 120  * ECC cipher suite support in OpenSSL originally written by
 121  * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories.
 122  *
 123  */
 124
 125 #include <stdio.h>
 126 #include "ssl_locl.h"
 127 #include "kssl_lcl.h"
 128 #include <openssl/buffer.h>
 129 #include <openssl/rand.h>
 130 #include <openssl/objects.h>
 131 #include <openssl/evp.h>
 132 #include <openssl/md5.h>
 133 #ifndef OPENSSL_NO_DH
 134 #include <openssl/dh.h>
 135 #endif
 136 #include <openssl/bn.h>
 137
 138 static const SSL_METHOD *ssl3_get_client_method(int ver);
 139 static int ca_dn_cmp(const X509_NAME * const *a,const X509_NAME * const *b);
 140
 141 #ifndef OPENSSL_NO_ECDH
 142 static int curve_id2nid(int curve_id);
 143 int check_srvr_ecc_cert_and_alg(X509 *x, SSL_CIPHER *cs);
 144 #endif
 145
 146 static const SSL_METHOD *ssl3_get_client_method(int ver)
 147         {
 148         if (ver == SSL3_VERSION)
 149                 return(SSLv3_client_method());
 150         else
 151                 return(NULL);
 152         }
 153
 154 IMPLEMENT_ssl3_meth_func(SSLv3_client_method,
 155                         ssl_undefined_function,
 156                         ssl3_connect,
 157                         ssl3_get_client_method)
 158
 159 int ssl3_connect(SSL *s)
 160         {
 161         BUF_MEM *buf=NULL;
 162         unsigned long Time=(unsigned long)time(NULL),l;
 163         long num1;
 164         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 165         int ret= -1;
 166         int new_state,state,skip=0;;
 167
 168         RAND_add(&Time,sizeof(Time),0);
 169         ERR_clear_error();
 170         clear_sys_error();
 171
 172         if (s->info_callback != NULL)
 173                 cb=s->info_callback;
 174         else if (s->ctx->info_callback != NULL)
 175                 cb=s->ctx->info_callback;
 176
 177         s->in_handshake++;
 178         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 179
 180         for (;;)
 181                 {
 182                 state=s->state;
 183
 184                 switch(s->state)
 185                         {
 186                 case SSL_ST_RENEGOTIATE:
 187                         s->new_session=1;
 188                         s->state=SSL_ST_CONNECT;
 189                         s->ctx->stats.sess_connect_renegotiate++;
 190                         /* break */
 191                 case SSL_ST_BEFORE:
 192                 case SSL_ST_CONNECT:
 193                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 194                 case SSL_ST_OK|SSL_ST_CONNECT:
 195
 196                         s->server=0;
 197                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 198
 199                         if ((s->version & 0xff00 ) != 0x0300)
 200                                 {
 201                                 SSLerr(SSL_F_SSL3_CONNECT, ERR_R_INTERNAL_ERROR);
 202                                 ret = -1;
 203                                 goto end;
 204                                 }
 205
 206                         /* s->version=SSL3_VERSION; */
 207                         s->type=SSL_ST_CONNECT;
 208
 209                         if (s->init_buf == NULL)
 210                                 {
 211                                 if ((buf=BUF_MEM_new()) == NULL)
 212                                         {
 213                                         ret= -1;
 214                                         goto end;
 215                                         }
 216                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 217                                         {
 218                                         ret= -1;
 219                                         goto end;
 220                                         }
 221                                 s->init_buf=buf;
 222                                 buf=NULL;
 223                                 }
 224
 225                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
 226
 227                         /* setup buffing BIO */
 228                         if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
 229
 230                         /* don't push the buffering BIO quite yet */
 231
 232                         ssl3_init_finished_mac(s);
 233
 234                         s->state=SSL3_ST_CW_CLNT_HELLO_A;
 235                         s->ctx->stats.sess_connect++;
 236                         s->init_num=0;
 237                         break;
 238
 239                 case SSL3_ST_CW_CLNT_HELLO_A:
 240                 case SSL3_ST_CW_CLNT_HELLO_B:
 241
 242                         s->shutdown=0;
 243                         ret=ssl3_client_hello(s);
 244                         if (ret <= 0) goto end;
 245                         s->state=SSL3_ST_CR_SRVR_HELLO_A;
 246                         s->init_num=0;
 247
 248                         /* turn on buffering for the next lot of output */
 249                         if (s->bbio != s->wbio)
 250                                 s->wbio=BIO_push(s->bbio,s->wbio);
 251
 252                         break;
 253
 254                 case SSL3_ST_CR_SRVR_HELLO_A:
 255                 case SSL3_ST_CR_SRVR_HELLO_B:
 256                         ret=ssl3_get_server_hello(s);
 257                         if (ret <= 0) goto end;
 258 #ifndef OPENSSL_NO_TLSEXT
 259                         {
 260                                 int al;
 261                                 if (ssl_check_tlsext(s,&al) <= 0)
 262                                         {
 263                                         ssl3_send_alert(s,SSL3_AL_FATAL,al); /* XXX does this *have* to be fatal? */
 264                                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_SERVERHELLO_TLS_EXT);
 265                                         ret = -1;
 266                                         goto end;
 267                                         }
 268                         }
 269 #endif
 270                         if (s->hit)
 271                                 s->state=SSL3_ST_CR_FINISHED_A;
 272                         else
 273                                 s->state=SSL3_ST_CR_CERT_A;
 274                         s->init_num=0;
 275                         break;
 276
 277                 case SSL3_ST_CR_CERT_A:
 278                 case SSL3_ST_CR_CERT_B:
 279                         /* Check if it is anon DH/ECDH */
 280                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 281                                 {
 282                                 ret=ssl3_get_server_certificate(s);
 283                                 if (ret <= 0) goto end;
 284                                 }
 285                         else
 286                                 skip=1;
 287                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 288                         s->init_num=0;
 289                         break;
 290
 291                 case SSL3_ST_CR_KEY_EXCH_A:
 292                 case SSL3_ST_CR_KEY_EXCH_B:
 293                         ret=ssl3_get_key_exchange(s);
 294                         if (ret <= 0) goto end;
 295                         s->state=SSL3_ST_CR_CERT_REQ_A;
 296                         s->init_num=0;
 297
 298                         /* at this point we check that we have the
 299                          * required stuff from the server */
 300                         if (!ssl3_check_cert_and_algorithm(s))
 301                                 {
 302                                 ret= -1;
 303                                 goto end;
 304                                 }
 305                         break;
 306
 307                 case SSL3_ST_CR_CERT_REQ_A:
 308                 case SSL3_ST_CR_CERT_REQ_B:
 309                         ret=ssl3_get_certificate_request(s);
 310                         if (ret <= 0) goto end;
 311                         s->state=SSL3_ST_CR_SRVR_DONE_A;
 312                         s->init_num=0;
 313                         break;
 314
 315                 case SSL3_ST_CR_SRVR_DONE_A:
 316                 case SSL3_ST_CR_SRVR_DONE_B:
 317                         ret=ssl3_get_server_done(s);
 318                         if (ret <= 0) goto end;
 319                         if (s->s3->tmp.cert_req)
 320                                 s->state=SSL3_ST_CW_CERT_A;
 321                         else
 322                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
 323                         s->init_num=0;
 324
 325                         break;
 326
 327                 case SSL3_ST_CW_CERT_A:
 328                 case SSL3_ST_CW_CERT_B:
 329                 case SSL3_ST_CW_CERT_C:
 330                 case SSL3_ST_CW_CERT_D:
 331                         ret=ssl3_send_client_certificate(s);
 332                         if (ret <= 0) goto end;
 333                         s->state=SSL3_ST_CW_KEY_EXCH_A;
 334                         s->init_num=0;
 335                         break;
 336
 337                 case SSL3_ST_CW_KEY_EXCH_A:
 338                 case SSL3_ST_CW_KEY_EXCH_B:
 339                         ret=ssl3_send_client_key_exchange(s);
 340                         if (ret <= 0) goto end;
 341                         l=s->s3->tmp.new_cipher->algorithms;
 342                         /* EAY EAY EAY need to check for DH fix cert
 343                          * sent back */
 344                         /* For TLS, cert_req is set to 2, so a cert chain
 345                          * of nothing is sent, but no verify packet is sent */
 346                         /* XXX: For now, we do not support client
 347                          * authentication in ECDH cipher suites with
 348                          * ECDH (rather than ECDSA) certificates.
 349                          * We need to skip the certificate verify
 350                          * message when client's ECDH public key is sent
 351                          * inside the client certificate.
 352                          */
 353                         if (s->s3->tmp.cert_req == 1)
 354                                 {
 355                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
 356                                 }
 357                         else
 358                                 {
 359                                 s->state=SSL3_ST_CW_CHANGE_A;
 360                                 s->s3->change_cipher_spec=0;
 361                                 }
 362
 363                         s->init_num=0;
 364                         break;
 365
 366                 case SSL3_ST_CW_CERT_VRFY_A:
 367                 case SSL3_ST_CW_CERT_VRFY_B:
 368                         ret=ssl3_send_client_verify(s);
 369                         if (ret <= 0) goto end;
 370                         s->state=SSL3_ST_CW_CHANGE_A;
 371                         s->init_num=0;
 372                         s->s3->change_cipher_spec=0;
 373                         break;
 374
 375                 case SSL3_ST_CW_CHANGE_A:
 376                 case SSL3_ST_CW_CHANGE_B:
 377                         ret=ssl3_send_change_cipher_spec(s,
 378                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
 379                         if (ret <= 0) goto end;
 380                         s->state=SSL3_ST_CW_FINISHED_A;
 381                         s->init_num=0;
 382
 383                         s->session->cipher=s->s3->tmp.new_cipher;
 384 #ifdef OPENSSL_NO_COMP
 385                         s->session->compress_meth=0;
 386 #else
 387                         if (s->s3->tmp.new_compression == NULL)
 388                                 s->session->compress_meth=0;
 389                         else
 390                                 s->session->compress_meth=
 391                                         s->s3->tmp.new_compression->id;
 392 #endif
 393                         if (!s->method->ssl3_enc->setup_key_block(s))
 394                                 {
 395                                 ret= -1;
 396                                 goto end;
 397                                 }
 398
 399                         if (!s->method->ssl3_enc->change_cipher_state(s,
 400                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 401                                 {
 402                                 ret= -1;
 403                                 goto end;
 404                                 }
 405
 406                         break;
 407
 408                 case SSL3_ST_CW_FINISHED_A:
 409                 case SSL3_ST_CW_FINISHED_B:
 410                         ret=ssl3_send_finished(s,
 411                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
 412                                 s->method->ssl3_enc->client_finished_label,
 413                                 s->method->ssl3_enc->client_finished_label_len);
 414                         if (ret <= 0) goto end;
 415                         s->state=SSL3_ST_CW_FLUSH;
 416
 417                         /* clear flags */
 418                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
 419                         if (s->hit)
 420                                 {
 421                                 s->s3->tmp.next_state=SSL_ST_OK;
 422                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
 423                                         {
 424                                         s->state=SSL_ST_OK;
 425                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
 426                                         s->s3->delay_buf_pop_ret=0;
 427                                         }
 428                                 }
 429                         else
 430                                 {
 431                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
 432                                 }
 433                         s->init_num=0;
 434                         break;
 435
 436                 case SSL3_ST_CR_FINISHED_A:
 437                 case SSL3_ST_CR_FINISHED_B:
 438
 439                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
 440                                 SSL3_ST_CR_FINISHED_B);
 441                         if (ret <= 0) goto end;
 442
 443                         if (s->hit)
 444                                 s->state=SSL3_ST_CW_CHANGE_A;
 445                         else
 446                                 s->state=SSL_ST_OK;
 447                         s->init_num=0;
 448                         break;
 449
 450                 case SSL3_ST_CW_FLUSH:
 451                         /* number of bytes to be flushed */
 452                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 453                         if (num1 > 0)
 454                                 {
 455                                 s->rwstate=SSL_WRITING;
 456                                 num1=BIO_flush(s->wbio);
 457                                 if (num1 <= 0) { ret= -1; goto end; }
 458                                 s->rwstate=SSL_NOTHING;
 459                                 }
 460
 461                         s->state=s->s3->tmp.next_state;
 462                         break;
 463
 464                 case SSL_ST_OK:
 465                         /* clean a few things up */
 466                         ssl3_cleanup_key_block(s);
 467
 468                         if (s->init_buf != NULL)
 469                                 {
 470                                 BUF_MEM_free(s->init_buf);
 471                                 s->init_buf=NULL;
 472                                 }
 473
 474                         /* If we are not 'joining' the last two packets,
 475                          * remove the buffering now */
 476                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 477                                 ssl_free_wbio_buffer(s);
 478                         /* else do it later in ssl3_write */
 479
 480                         s->init_num=0;
 481                         s->new_session=0;
 482
 483                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 484                         if (s->hit) s->ctx->stats.sess_hit++;
 485
 486                         ret=1;
 487                         /* s->server=0; */
 488                         s->handshake_func=ssl3_connect;
 489                         s->ctx->stats.sess_connect_good++;
 490
 491                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 492
 493                         goto end;
 494                         /* break; */
 495
 496                 default:
 497                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_UNKNOWN_STATE);
 498                         ret= -1;
 499                         goto end;
 500                         /* break; */
 501                         }
 502
 503                 /* did we do anything */
 504                 if (!s->s3->tmp.reuse_message && !skip)
 505                         {
 506                         if (s->debug)
 507                                 {
 508                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 509                                         goto end;
 510                                 }
 511
 512                         if ((cb != NULL) && (s->state != state))
 513                                 {
 514                                 new_state=s->state;
 515                                 s->state=state;
 516                                 cb(s,SSL_CB_CONNECT_LOOP,1);
 517                                 s->state=new_state;
 518                                 }
 519                         }
 520                 skip=0;
 521                 }
 522 end:
 523         s->in_handshake--;
 524         if (buf != NULL)
 525                 BUF_MEM_free(buf);
 526         if (cb != NULL)
 527                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 528         return(ret);
 529         }
 530
 531
 532 int ssl3_client_hello(SSL *s)
 533         {
 534         unsigned char *buf;
 535         unsigned char *p,*d;
 536         int i;
 537         unsigned long Time,l;
 538 #ifndef OPENSSL_NO_COMP
 539         int j;
 540         SSL_COMP *comp;
 541 #endif
 542
 543         buf=(unsigned char *)s->init_buf->data;
 544         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
 545                 {
 546                 if ((s->session == NULL) ||
 547                         (s->session->ssl_version != s->version) ||
 548                         (s->session->not_resumable))
 549                         {
 550                         if (!ssl_get_new_session(s,0))
 551                                 goto err;
 552                         }
 553                 /* else use the pre-loaded session */
 554
 555                 p=s->s3->client_random;
 556                 Time=(unsigned long)time(NULL);                 /* Time */
 557                 l2n(Time,p);
 558                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
 559                         goto err;
 560
 561                 /* Do the message type and length last */
 562                 d=p= &(buf[4]);
 563
 564                 *(p++)=s->version>>8;
 565                 *(p++)=s->version&0xff;
 566                 s->client_version=s->version;
 567
 568                 /* Random stuff */
 569                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 570                 p+=SSL3_RANDOM_SIZE;
 571
 572                 /* Session ID */
 573                 if (s->new_session)
 574                         i=0;
 575                 else
 576                         i=s->session->session_id_length;
 577                 *(p++)=i;
 578                 if (i != 0)
 579                         {
 580                         if (i > (int)sizeof(s->session->session_id))
 581                                 {
 582                                 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 583                                 goto err;
 584                                 }
 585                         memcpy(p,s->session->session_id,i);
 586                         p+=i;
 587                         }
 588
 589                 /* Ciphers supported */
 590                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
 591                 if (i == 0)
 592                         {
 593                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 594                         goto err;
 595                         }
 596                 s2n(i,p);
 597                 p+=i;
 598
 599                 /* COMPRESSION */
 600 #ifdef OPENSSL_NO_COMP
 601                 *(p++)=1;
 602 #else
 603
 604                 if ((s->options & SSL_OP_NO_COMPRESSION)
 605                                         || !s->ctx->comp_methods)
 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 #endif
 616                 *(p++)=0; /* Add the NULL method */
 617 #ifndef OPENSSL_NO_TLSEXT
 618                 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
 619                         {
 620                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
 621                         goto err;
 622                         }
 623 #endif
 624
 625                 l=(p-d);
 626                 d=buf;
 627                 *(d++)=SSL3_MT_CLIENT_HELLO;
 628                 l2n3(l,d);
 629
 630                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 631                 /* number of bytes to write */
 632                 s->init_num=p-buf;
 633                 s->init_off=0;
 634                 }
 635
 636         /* SSL3_ST_CW_CLNT_HELLO_B */
 637         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 638 err:
 639         return(-1);
 640         }
 641
 642 int ssl3_get_server_hello(SSL *s)
 643         {
 644         STACK_OF(SSL_CIPHER) *sk;
 645         SSL_CIPHER *c;
 646         unsigned char *p,*d;
 647         int i,al,ok;
 648         unsigned int j;
 649         long n;
 650 #ifndef OPENSSL_NO_COMP
 651         SSL_COMP *comp;
 652 #endif
 653
 654         n=s->method->ssl_get_message(s,
 655                 SSL3_ST_CR_SRVR_HELLO_A,
 656                 SSL3_ST_CR_SRVR_HELLO_B,
 657                 -1,
 658                 300, /* ?? */
 659                 &ok);
 660
 661         if (!ok) return((int)n);
 662
 663         if ( SSL_version(s) == DTLS1_VERSION)
 664                 {
 665                 if ( s->s3->tmp.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST)
 666                         {
 667                         if ( s->d1->send_cookie == 0)
 668                                 {
 669                                 s->s3->tmp.reuse_message = 1;
 670                                 return 1;
 671                                 }
 672                         else /* already sent a cookie */
 673                                 {
 674                                 al=SSL_AD_UNEXPECTED_MESSAGE;
 675                                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
 676                                 goto f_err;
 677                                 }
 678                         }
 679                 }
 680
 681         if ( s->s3->tmp.message_type != SSL3_MT_SERVER_HELLO)
 682                 {
 683                 al=SSL_AD_UNEXPECTED_MESSAGE;
 684                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
 685                 goto f_err;
 686                 }
 687
 688         d=p=(unsigned char *)s->init_msg;
 689
 690         if ((p[0] != (s->version>>8)) || (p[1] != (s->version&0xff)))
 691                 {
 692                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
 693                 s->version=(s->version&0xff00)|p[1];
 694                 al=SSL_AD_PROTOCOL_VERSION;
 695                 goto f_err;
 696                 }
 697         p+=2;
 698
 699         /* load the server hello data */
 700         /* load the server random */
 701         memcpy(s->s3->server_random,p,SSL3_RANDOM_SIZE);
 702         p+=SSL3_RANDOM_SIZE;
 703
 704         /* get the session-id */
 705         j= *(p++);
 706
 707         if ((j > sizeof s->session->session_id) || (j > SSL3_SESSION_ID_SIZE))
 708                 {
 709                 al=SSL_AD_ILLEGAL_PARAMETER;
 710                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_LONG);
 711                 goto f_err;
 712                 }
 713
 714         if (j != 0 && j == s->session->session_id_length
 715             && memcmp(p,s->session->session_id,j) == 0)
 716             {
 717             if(s->sid_ctx_length != s->session->sid_ctx_length
 718                || memcmp(s->session->sid_ctx,s->sid_ctx,s->sid_ctx_length))
 719                 {
 720                 /* actually a client application bug */
 721                 al=SSL_AD_ILLEGAL_PARAMETER;
 722                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
 723                 goto f_err;
 724                 }
 725             s->hit=1;
 726             }
 727         else    /* a miss or crap from the other end */
 728                 {
 729                 /* If we were trying for session-id reuse, make a new
 730                  * SSL_SESSION so we don't stuff up other people */
 731                 s->hit=0;
 732                 if (s->session->session_id_length > 0)
 733                         {
 734                         if (!ssl_get_new_session(s,0))
 735                                 {
 736                                 al=SSL_AD_INTERNAL_ERROR;
 737                                 goto f_err;
 738                                 }
 739                         }
 740                 s->session->session_id_length=j;
 741                 memcpy(s->session->session_id,p,j); /* j could be 0 */
 742                 }
 743         p+=j;
 744         c=ssl_get_cipher_by_char(s,p);
 745         if (c == NULL)
 746                 {
 747                 /* unknown cipher */
 748                 al=SSL_AD_ILLEGAL_PARAMETER;
 749                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNKNOWN_CIPHER_RETURNED);
 750                 goto f_err;
 751                 }
 752         p+=ssl_put_cipher_by_char(s,NULL,NULL);
 753
 754         sk=ssl_get_ciphers_by_id(s);
 755         i=sk_SSL_CIPHER_find(sk,c);
 756         if (i < 0)
 757                 {
 758                 /* we did not say we would use this cipher */
 759                 al=SSL_AD_ILLEGAL_PARAMETER;
 760                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
 761                 goto f_err;
 762                 }
 763
 764         /* Depending on the session caching (internal/external), the cipher
 765            and/or cipher_id values may not be set. Make sure that
 766            cipher_id is set and use it for comparison. */
 767         if (s->session->cipher)
 768                 s->session->cipher_id = s->session->cipher->id;
 769         if (s->hit && (s->session->cipher_id != c->id))
 770                 {
 771                 if (!(s->options &
 772                         SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
 773                         {
 774                         al=SSL_AD_ILLEGAL_PARAMETER;
 775                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
 776                         goto f_err;
 777                         }
 778                 }
 779         s->s3->tmp.new_cipher=c;
 780
 781         /* lets get the compression algorithm */
 782         /* COMPRESSION */
 783 #ifdef OPENSSL_NO_COMP
 784         if (*(p++) != 0)
 785                 {
 786                 al=SSL_AD_ILLEGAL_PARAMETER;
 787                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
 788                 goto f_err;
 789                 }
 790 #else
 791         j= *(p++);
 792         if ((j == 0) || (s->options & SSL_OP_NO_COMPRESSION))
 793                 comp=NULL;
 794         else
 795                 comp=ssl3_comp_find(s->ctx->comp_methods,j);
 796
 797         if ((j != 0) && (comp == NULL))
 798                 {
 799                 al=SSL_AD_ILLEGAL_PARAMETER;
 800                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
 801                 goto f_err;
 802                 }
 803         else
 804                 {
 805                 s->s3->tmp.new_compression=comp;
 806                 }
 807 #endif
 808 #ifndef OPENSSL_NO_TLSEXT
 809         /* TLS extensions*/
 810         if (s->version > SSL3_VERSION)
 811                 {
 812                 if (!ssl_parse_serverhello_tlsext(s,&p,d,n, &al))
 813                         {
 814                         /* 'al' set by ssl_parse_serverhello_tlsext */
 815                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_PARSE_TLS_EXT);
 816                         goto f_err;
 817                         }
 818                 }
 819 #endif
 820
 821         if (p != (d+n))
 822                 {
 823                 /* wrong packet length */
 824                 al=SSL_AD_DECODE_ERROR;
 825                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
 826                 goto err;
 827                 }
 828
 829         return(1);
 830 f_err:
 831         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 832 err:
 833         return(-1);
 834         }
 835
 836 int ssl3_get_server_certificate(SSL *s)
 837         {
 838         int al,i,ok,ret= -1;
 839         unsigned long n,nc,llen,l;
 840         X509 *x=NULL;
 841         const unsigned char *q,*p;
 842         unsigned char *d;
 843         STACK_OF(X509) *sk=NULL;
 844         SESS_CERT *sc;
 845         EVP_PKEY *pkey=NULL;
 846         int need_cert = 1; /* VRS: 0=> will allow null cert if auth == KRB5 */
 847
 848         n=s->method->ssl_get_message(s,
 849                 SSL3_ST_CR_CERT_A,
 850                 SSL3_ST_CR_CERT_B,
 851                 -1,
 852                 s->max_cert_list,
 853                 &ok);
 854
 855         if (!ok) return((int)n);
 856
 857         if (s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE)
 858                 {
 859                 s->s3->tmp.reuse_message=1;
 860                 return(1);
 861                 }
 862
 863         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
 864                 {
 865                 al=SSL_AD_UNEXPECTED_MESSAGE;
 866                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
 867                 goto f_err;
 868                 }
 869         p=d=(unsigned char *)s->init_msg;
 870
 871         if ((sk=sk_X509_new_null()) == NULL)
 872                 {
 873                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
 874                 goto err;
 875                 }
 876
 877         n2l3(p,llen);
 878         if (llen+3 != n)
 879                 {
 880                 al=SSL_AD_DECODE_ERROR;
 881                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
 882                 goto f_err;
 883                 }
 884         for (nc=0; nc<llen; )
 885                 {
 886                 n2l3(p,l);
 887                 if ((l+nc+3) > llen)
 888                         {
 889                         al=SSL_AD_DECODE_ERROR;
 890                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
 891                         goto f_err;
 892                         }
 893
 894                 q=p;
 895                 x=d2i_X509(NULL,&q,l);
 896                 if (x == NULL)
 897                         {
 898                         al=SSL_AD_BAD_CERTIFICATE;
 899                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
 900                         goto f_err;
 901                         }
 902                 if (q != (p+l))
 903                         {
 904                         al=SSL_AD_DECODE_ERROR;
 905                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
 906                         goto f_err;
 907                         }
 908                 if (!sk_X509_push(sk,x))
 909                         {
 910                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
 911                         goto err;
 912                         }
 913                 x=NULL;
 914                 nc+=l+3;
 915                 p=q;
 916                 }
 917
 918         i=ssl_verify_cert_chain(s,sk);
 919         if ((s->verify_mode != SSL_VERIFY_NONE) && (!i)
 920 #ifndef OPENSSL_NO_KRB5
 921                 && (s->s3->tmp.new_cipher->algorithms & (SSL_MKEY_MASK|SSL_AUTH_MASK))
 922                 != (SSL_aKRB5|SSL_kKRB5)
 923 #endif /* OPENSSL_NO_KRB5 */
 924                 )
 925                 {
 926                 al=ssl_verify_alarm_type(s->verify_result);
 927                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
 928                 goto f_err;
 929                 }
 930         ERR_clear_error(); /* but we keep s->verify_result */
 931
 932         sc=ssl_sess_cert_new();
 933         if (sc == NULL) goto err;
 934
 935         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
 936         s->session->sess_cert=sc;
 937
 938         sc->cert_chain=sk;
 939         /* Inconsistency alert: cert_chain does include the peer's
 940          * certificate, which we don't include in s3_srvr.c */
 941         x=sk_X509_value(sk,0);
 942         sk=NULL;
 943         /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/
 944
 945         pkey=X509_get_pubkey(x);
 946
 947         /* VRS: allow null cert if auth == KRB5 */
 948         need_cert =     ((s->s3->tmp.new_cipher->algorithms
 949                          & (SSL_MKEY_MASK|SSL_AUTH_MASK))
 950                          == (SSL_aKRB5|SSL_kKRB5))? 0: 1;
 951
 952 #ifdef KSSL_DEBUG
 953         printf("pkey,x = %p, %p\n", pkey,x);
 954         printf("ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x,pkey));
 955         printf("cipher, alg, nc = %s, %lx, %d\n", s->s3->tmp.new_cipher->name,
 956                 s->s3->tmp.new_cipher->algorithms, need_cert);
 957 #endif    /* KSSL_DEBUG */
 958
 959         if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey)))
 960                 {
 961                 x=NULL;
 962                 al=SSL3_AL_FATAL;
 963                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
 964                         SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
 965                 goto f_err;
 966                 }
 967
 968         i=ssl_cert_type(x,pkey);
 969         if (need_cert && i < 0)
 970                 {
 971                 x=NULL;
 972                 al=SSL3_AL_FATAL;
 973                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
 974                         SSL_R_UNKNOWN_CERTIFICATE_TYPE);
 975                 goto f_err;
 976                 }
 977
 978         if (need_cert)
 979                 {
 980                 sc->peer_cert_type=i;
 981                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
 982                 /* Why would the following ever happen?
 983                  * We just created sc a couple of lines ago. */
 984                 if (sc->peer_pkeys[i].x509 != NULL)
 985                         X509_free(sc->peer_pkeys[i].x509);
 986                 sc->peer_pkeys[i].x509=x;
 987                 sc->peer_key= &(sc->peer_pkeys[i]);
 988
 989                 if (s->session->peer != NULL)
 990                         X509_free(s->session->peer);
 991                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
 992                 s->session->peer=x;
 993                 }
 994         else
 995                 {
 996                 sc->peer_cert_type=i;
 997                 sc->peer_key= NULL;
 998
 999                 if (s->session->peer != NULL)
1000                         X509_free(s->session->peer);
1001                 s->session->peer=NULL;
1002                 }
1003         s->session->verify_result = s->verify_result;
1004
1005         x=NULL;
1006         ret=1;
1007
1008         if (0)
1009                 {
1010 f_err:
1011                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1012                 }
1013 err:
1014         EVP_PKEY_free(pkey);
1015         X509_free(x);
1016         sk_X509_pop_free(sk,X509_free);
1017         return(ret);
1018         }
1019
1020 int ssl3_get_key_exchange(SSL *s)
1021         {
1022 #ifndef OPENSSL_NO_RSA
1023         unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
1024 #endif
1025         EVP_MD_CTX md_ctx;
1026         unsigned char *param,*p;
1027         int al,i,j,param_len,ok;
1028         long n,alg;
1029         EVP_PKEY *pkey=NULL;
1030 #ifndef OPENSSL_NO_RSA
1031         RSA *rsa=NULL;
1032 #endif
1033 #ifndef OPENSSL_NO_DH
1034         DH *dh=NULL;
1035 #endif
1036 #ifndef OPENSSL_NO_ECDH
1037         EC_KEY *ecdh = NULL;
1038         BN_CTX *bn_ctx = NULL;
1039         EC_POINT *srvr_ecpoint = NULL;
1040         int curve_nid = 0;
1041         int encoded_pt_len = 0;
1042 #endif
1043
1044         /* use same message size as in ssl3_get_certificate_request()
1045          * as ServerKeyExchange message may be skipped */
1046         n=s->method->ssl_get_message(s,
1047                 SSL3_ST_CR_KEY_EXCH_A,
1048                 SSL3_ST_CR_KEY_EXCH_B,
1049                 -1,
1050                 s->max_cert_list,
1051                 &ok);
1052
1053         if (!ok) return((int)n);
1054
1055         if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
1056                 {
1057                 s->s3->tmp.reuse_message=1;
1058                 return(1);
1059                 }
1060
1061         param=p=(unsigned char *)s->init_msg;
1062
1063         if (s->session->sess_cert != NULL)
1064                 {
1065 #ifndef OPENSSL_NO_RSA
1066                 if (s->session->sess_cert->peer_rsa_tmp != NULL)
1067                         {
1068                         RSA_free(s->session->sess_cert->peer_rsa_tmp);
1069                         s->session->sess_cert->peer_rsa_tmp=NULL;
1070                         }
1071 #endif
1072 #ifndef OPENSSL_NO_DH
1073                 if (s->session->sess_cert->peer_dh_tmp)
1074                         {
1075                         DH_free(s->session->sess_cert->peer_dh_tmp);
1076                         s->session->sess_cert->peer_dh_tmp=NULL;
1077                         }
1078 #endif
1079 #ifndef OPENSSL_NO_ECDH
1080                 if (s->session->sess_cert->peer_ecdh_tmp)
1081                         {
1082                         EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp);
1083                         s->session->sess_cert->peer_ecdh_tmp=NULL;
1084                         }
1085 #endif
1086                 }
1087         else
1088                 {
1089                 s->session->sess_cert=ssl_sess_cert_new();
1090                 }
1091
1092         param_len=0;
1093         alg=s->s3->tmp.new_cipher->algorithms;
1094         EVP_MD_CTX_init(&md_ctx);
1095
1096 #ifndef OPENSSL_NO_RSA
1097         if (alg & SSL_kRSA)
1098                 {
1099                 if ((rsa=RSA_new()) == NULL)
1100                         {
1101                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1102                         goto err;
1103                         }
1104                 n2s(p,i);
1105                 param_len=i+2;
1106                 if (param_len > n)
1107                         {
1108                         al=SSL_AD_DECODE_ERROR;
1109                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
1110                         goto f_err;
1111                         }
1112                 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
1113                         {
1114                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1115                         goto err;
1116                         }
1117                 p+=i;
1118
1119                 n2s(p,i);
1120                 param_len+=i+2;
1121                 if (param_len > n)
1122                         {
1123                         al=SSL_AD_DECODE_ERROR;
1124                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
1125                         goto f_err;
1126                         }
1127                 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
1128                         {
1129                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1130                         goto err;
1131                         }
1132                 p+=i;
1133                 n-=param_len;
1134
1135                 /* this should be because we are using an export cipher */
1136                 if (alg & SSL_aRSA)
1137                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1138                 else
1139                         {
1140                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1141                         goto err;
1142                         }
1143                 s->session->sess_cert->peer_rsa_tmp=rsa;
1144                 rsa=NULL;
1145                 }
1146 #else /* OPENSSL_NO_RSA */
1147         if (0)
1148                 ;
1149 #endif
1150 #ifndef OPENSSL_NO_DH
1151         else if (alg & SSL_kEDH)
1152                 {
1153                 if ((dh=DH_new()) == NULL)
1154                         {
1155                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
1156                         goto err;
1157                         }
1158                 n2s(p,i);
1159                 param_len=i+2;
1160                 if (param_len > n)
1161                         {
1162                         al=SSL_AD_DECODE_ERROR;
1163                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
1164                         goto f_err;
1165                         }
1166                 if (!(dh->p=BN_bin2bn(p,i,NULL)))
1167                         {
1168                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1169                         goto err;
1170                         }
1171                 p+=i;
1172
1173                 n2s(p,i);
1174                 param_len+=i+2;
1175                 if (param_len > n)
1176                         {
1177                         al=SSL_AD_DECODE_ERROR;
1178                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
1179                         goto f_err;
1180                         }
1181                 if (!(dh->g=BN_bin2bn(p,i,NULL)))
1182                         {
1183                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1184                         goto err;
1185                         }
1186                 p+=i;
1187
1188                 n2s(p,i);
1189                 param_len+=i+2;
1190                 if (param_len > n)
1191                         {
1192                         al=SSL_AD_DECODE_ERROR;
1193                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
1194                         goto f_err;
1195                         }
1196                 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
1197                         {
1198                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1199                         goto err;
1200                         }
1201                 p+=i;
1202                 n-=param_len;
1203
1204 #ifndef OPENSSL_NO_RSA
1205                 if (alg & SSL_aRSA)
1206                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1207 #else
1208                 if (0)
1209                         ;
1210 #endif
1211 #ifndef OPENSSL_NO_DSA
1212                 else if (alg & SSL_aDSS)
1213                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1214 #endif
1215                 /* else anonymous DH, so no certificate or pkey. */
1216
1217                 s->session->sess_cert->peer_dh_tmp=dh;
1218                 dh=NULL;
1219                 }
1220         else if ((alg & SSL_kDHr) || (alg & SSL_kDHd))
1221                 {
1222                 al=SSL_AD_ILLEGAL_PARAMETER;
1223                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1224                 goto f_err;
1225                 }
1226 #endif /* !OPENSSL_NO_DH */
1227
1228 #ifndef OPENSSL_NO_ECDH
1229         else if (alg & SSL_kECDHE)
1230                 {
1231                 EC_GROUP *ngroup;
1232                 const EC_GROUP *group;
1233
1234                 if ((ecdh=EC_KEY_new()) == NULL)
1235                         {
1236                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1237                         goto err;
1238                         }
1239
1240                 /* Extract elliptic curve parameters and the
1241                  * server's ephemeral ECDH public key.
1242                  * Keep accumulating lengths of various components in
1243                  * param_len and make sure it never exceeds n.
1244                  */
1245
1246                 /* XXX: For now we only support named (not generic) curves
1247                  * and the ECParameters in this case is just three bytes.
1248                  */
1249                 param_len=3;
1250                 if ((param_len > n) ||
1251                     (*p != NAMED_CURVE_TYPE) ||
1252                     ((curve_nid = curve_id2nid(*(p + 2))) == 0))
1253                         {
1254                         al=SSL_AD_INTERNAL_ERROR;
1255                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
1256                         goto f_err;
1257                         }
1258
1259                 ngroup = EC_GROUP_new_by_curve_name(curve_nid);
1260                 if (ngroup == NULL)
1261                         {
1262                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1263                         goto err;
1264                         }
1265                 if (EC_KEY_set_group(ecdh, ngroup) == 0)
1266                         {
1267                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1268                         goto err;
1269                         }
1270                 EC_GROUP_free(ngroup);
1271
1272                 group = EC_KEY_get0_group(ecdh);
1273
1274                 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1275                     (EC_GROUP_get_degree(group) > 163))
1276                         {
1277                         al=SSL_AD_EXPORT_RESTRICTION;
1278                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1279                         goto f_err;
1280                         }
1281
1282                 p+=3;
1283
1284                 /* Next, get the encoded ECPoint */
1285                 if (((srvr_ecpoint = EC_POINT_new(group)) == NULL) ||
1286                     ((bn_ctx = BN_CTX_new()) == NULL))
1287                         {
1288                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1289                         goto err;
1290                         }
1291
1292                 encoded_pt_len = *p;  /* length of encoded point */
1293                 p+=1;
1294                 param_len += (1 + encoded_pt_len);
1295                 if ((param_len > n) ||
1296                     (EC_POINT_oct2point(group, srvr_ecpoint,
1297                         p, encoded_pt_len, bn_ctx) == 0))
1298                         {
1299                         al=SSL_AD_DECODE_ERROR;
1300                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_ECPOINT);
1301                         goto f_err;
1302                         }
1303
1304                 n-=param_len;
1305                 p+=encoded_pt_len;
1306
1307                 /* The ECC/TLS specification does not mention
1308                  * the use of DSA to sign ECParameters in the server
1309                  * key exchange message. We do support RSA and ECDSA.
1310                  */
1311                 if (0) ;
1312 #ifndef OPENSSL_NO_RSA
1313                 else if (alg & SSL_aRSA)
1314                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1315 #endif
1316 #ifndef OPENSSL_NO_ECDSA
1317                 else if (alg & SSL_aECDSA)
1318                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1319 #endif
1320                 /* else anonymous ECDH, so no certificate or pkey. */
1321                 EC_KEY_set_public_key(ecdh, srvr_ecpoint);
1322                 s->session->sess_cert->peer_ecdh_tmp=ecdh;
1323                 ecdh=NULL;
1324                 BN_CTX_free(bn_ctx);
1325                 EC_POINT_free(srvr_ecpoint);
1326                 srvr_ecpoint = NULL;
1327                 }
1328         else if (alg & SSL_kECDH)
1329                 {
1330                 al=SSL_AD_UNEXPECTED_MESSAGE;
1331                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1332                 goto f_err;
1333                 }
1334 #endif /* !OPENSSL_NO_ECDH */
1335         if (alg & SSL_aFZA)
1336                 {
1337                 al=SSL_AD_HANDSHAKE_FAILURE;
1338                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1339                 goto f_err;
1340                 }
1341
1342
1343         /* p points to the next byte, there are 'n' bytes left */
1344
1345         /* if it was signed, check the signature */
1346         if (pkey != NULL)
1347                 {
1348                 n2s(p,i);
1349                 n-=2;
1350                 j=EVP_PKEY_size(pkey);
1351
1352                 if ((i != n) || (n > j) || (n <= 0))
1353                         {
1354                         /* wrong packet length */
1355                         al=SSL_AD_DECODE_ERROR;
1356                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1357                         goto f_err;
1358                         }
1359
1360 #ifndef OPENSSL_NO_RSA
1361                 if (pkey->type == EVP_PKEY_RSA)
1362                         {
1363                         int num;
1364
1365                         j=0;
1366                         q=md_buf;
1367                         for (num=2; num > 0; num--)
1368                                 {
1369                                 EVP_DigestInit_ex(&md_ctx,(num == 2)
1370                                         ?s->ctx->md5:s->ctx->sha1, NULL);
1371                                 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1372                                 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1373                                 EVP_DigestUpdate(&md_ctx,param,param_len);
1374                                 EVP_DigestFinal_ex(&md_ctx,q,(unsigned int *)&i);
1375                                 q+=i;
1376                                 j+=i;
1377                                 }
1378                         i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
1379                                                                 pkey->pkey.rsa);
1380                         if (i < 0)
1381                                 {
1382                                 al=SSL_AD_DECRYPT_ERROR;
1383                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1384                                 goto f_err;
1385                                 }
1386                         if (i == 0)
1387                                 {
1388                                 /* bad signature */
1389                                 al=SSL_AD_DECRYPT_ERROR;
1390                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1391                                 goto f_err;
1392                                 }
1393                         }
1394                 else
1395 #endif
1396 #ifndef OPENSSL_NO_DSA
1397                         if (pkey->type == EVP_PKEY_DSA)
1398                         {
1399                         /* lets do DSS */
1400                         EVP_VerifyInit_ex(&md_ctx,EVP_dss1(), NULL);
1401                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1402                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1403                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1404                         if (!EVP_VerifyFinal(&md_ctx,p,(int)n,pkey))
1405                                 {
1406                                 /* bad signature */
1407                                 al=SSL_AD_DECRYPT_ERROR;
1408                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1409                                 goto f_err;
1410                                 }
1411                         }
1412                 else
1413 #endif
1414 #ifndef OPENSSL_NO_ECDSA
1415                         if (pkey->type == EVP_PKEY_EC)
1416                         {
1417                         /* let's do ECDSA */
1418                         EVP_VerifyInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1419                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1420                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1421                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1422                         if (!EVP_VerifyFinal(&md_ctx,p,(int)n,pkey))
1423                                 {
1424                                 /* bad signature */
1425                                 al=SSL_AD_DECRYPT_ERROR;
1426                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1427                                 goto f_err;
1428                                 }
1429                         }
1430                 else
1431 #endif
1432                         {
1433                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1434                         goto err;
1435                         }
1436                 }
1437         else
1438                 {
1439                 /* still data left over */
1440                 if (!(alg & SSL_aNULL))
1441                         {
1442                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1443                         goto err;
1444                         }
1445                 if (n != 0)
1446                         {
1447                         al=SSL_AD_DECODE_ERROR;
1448                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
1449                         goto f_err;
1450                         }
1451                 }
1452         EVP_PKEY_free(pkey);
1453         EVP_MD_CTX_cleanup(&md_ctx);
1454         return(1);
1455 f_err:
1456         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1457 err:
1458         EVP_PKEY_free(pkey);
1459 #ifndef OPENSSL_NO_RSA
1460         if (rsa != NULL)
1461                 RSA_free(rsa);
1462 #endif
1463 #ifndef OPENSSL_NO_DH
1464         if (dh != NULL)
1465                 DH_free(dh);
1466 #endif
1467 #ifndef OPENSSL_NO_ECDH
1468         BN_CTX_free(bn_ctx);
1469         EC_POINT_free(srvr_ecpoint);
1470         if (ecdh != NULL)
1471                 EC_KEY_free(ecdh);
1472 #endif
1473         EVP_MD_CTX_cleanup(&md_ctx);
1474         return(-1);
1475         }
1476
1477 int ssl3_get_certificate_request(SSL *s)
1478         {
1479         int ok,ret=0;
1480         unsigned long n,nc,l;
1481         unsigned int llen,ctype_num,i;
1482         X509_NAME *xn=NULL;
1483         const unsigned char *p,*q;
1484         unsigned char *d;
1485         STACK_OF(X509_NAME) *ca_sk=NULL;
1486
1487         n=s->method->ssl_get_message(s,
1488                 SSL3_ST_CR_CERT_REQ_A,
1489                 SSL3_ST_CR_CERT_REQ_B,
1490                 -1,
1491                 s->max_cert_list,
1492                 &ok);
1493
1494         if (!ok) return((int)n);
1495
1496         s->s3->tmp.cert_req=0;
1497
1498         if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
1499                 {
1500                 s->s3->tmp.reuse_message=1;
1501                 return(1);
1502                 }
1503
1504         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
1505                 {
1506                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1507                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
1508                 goto err;
1509                 }
1510
1511         /* TLS does not like anon-DH with client cert */
1512         if (s->version > SSL3_VERSION)
1513                 {
1514                 l=s->s3->tmp.new_cipher->algorithms;
1515                 if (l & SSL_aNULL)
1516                         {
1517                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1518                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
1519                         goto err;
1520                         }
1521                 }
1522
1523         p=d=(unsigned char *)s->init_msg;
1524
1525         if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
1526                 {
1527                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1528                 goto err;
1529                 }
1530
1531         /* get the certificate types */
1532         ctype_num= *(p++);
1533         if (ctype_num > SSL3_CT_NUMBER)
1534                 ctype_num=SSL3_CT_NUMBER;
1535         for (i=0; i<ctype_num; i++)
1536                 s->s3->tmp.ctype[i]= p[i];
1537         p+=ctype_num;
1538
1539         /* get the CA RDNs */
1540         n2s(p,llen);
1541 #if 0
1542 {
1543 FILE *out;
1544 out=fopen("/tmp/vsign.der","w");
1545 fwrite(p,1,llen,out);
1546 fclose(out);
1547 }
1548 #endif
1549
1550         if ((llen+ctype_num+2+1) != n)
1551                 {
1552                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1553                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
1554                 goto err;
1555                 }
1556
1557         for (nc=0; nc<llen; )
1558                 {
1559                 n2s(p,l);
1560                 if ((l+nc+2) > llen)
1561                         {
1562                         if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1563                                 goto cont; /* netscape bugs */
1564                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1565                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
1566                         goto err;
1567                         }
1568
1569                 q=p;
1570
1571                 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
1572                         {
1573                         /* If netscape tolerance is on, ignore errors */
1574                         if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
1575                                 goto cont;
1576                         else
1577                                 {
1578                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1579                                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
1580                                 goto err;
1581                                 }
1582                         }
1583
1584                 if (q != (p+l))
1585                         {
1586                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1587                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
1588                         goto err;
1589                         }
1590                 if (!sk_X509_NAME_push(ca_sk,xn))
1591                         {
1592                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1593                         goto err;
1594                         }
1595
1596                 p+=l;
1597                 nc+=l+2;
1598                 }
1599
1600         if (0)
1601                 {
1602 cont:
1603                 ERR_clear_error();
1604                 }
1605
1606         /* we should setup a certificate to return.... */
1607         s->s3->tmp.cert_req=1;
1608         s->s3->tmp.ctype_num=ctype_num;
1609         if (s->s3->tmp.ca_names != NULL)
1610                 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
1611         s->s3->tmp.ca_names=ca_sk;
1612         ca_sk=NULL;
1613
1614         ret=1;
1615 err:
1616         if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
1617         return(ret);
1618         }
1619
1620 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
1621         {
1622         return(X509_NAME_cmp(*a,*b));
1623         }
1624
1625 int ssl3_get_server_done(SSL *s)
1626         {
1627         int ok,ret=0;
1628         long n;
1629
1630         n=s->method->ssl_get_message(s,
1631                 SSL3_ST_CR_SRVR_DONE_A,
1632                 SSL3_ST_CR_SRVR_DONE_B,
1633                 SSL3_MT_SERVER_DONE,
1634                 30, /* should be very small, like 0 :-) */
1635                 &ok);
1636
1637         if (!ok) return((int)n);
1638         if (n > 0)
1639                 {
1640                 /* should contain no data */
1641                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1642                 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
1643                 return -1;
1644                 }
1645         ret=1;
1646         return(ret);
1647         }
1648
1649
1650 int ssl3_send_client_key_exchange(SSL *s)
1651         {
1652         unsigned char *p,*d;
1653         int n;
1654         unsigned long l;
1655 #ifndef OPENSSL_NO_RSA
1656         unsigned char *q;
1657         EVP_PKEY *pkey=NULL;
1658 #endif
1659 #ifndef OPENSSL_NO_KRB5
1660         KSSL_ERR kssl_err;
1661 #endif /* OPENSSL_NO_KRB5 */
1662 #ifndef OPENSSL_NO_ECDH
1663         EC_KEY *clnt_ecdh = NULL;
1664         const EC_POINT *srvr_ecpoint = NULL;
1665         EVP_PKEY *srvr_pub_pkey = NULL;
1666         unsigned char *encodedPoint = NULL;
1667         int encoded_pt_len = 0;
1668         BN_CTX * bn_ctx = NULL;
1669 #endif
1670
1671         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
1672                 {
1673                 d=(unsigned char *)s->init_buf->data;
1674                 p= &(d[4]);
1675
1676                 l=s->s3->tmp.new_cipher->algorithms;
1677
1678                 /* Fool emacs indentation */
1679                 if (0) {}
1680 #ifndef OPENSSL_NO_RSA
1681                 else if (l & SSL_kRSA)
1682                         {
1683                         RSA *rsa;
1684                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1685
1686                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
1687                                 rsa=s->session->sess_cert->peer_rsa_tmp;
1688                         else
1689                                 {
1690                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1691                                 if ((pkey == NULL) ||
1692                                         (pkey->type != EVP_PKEY_RSA) ||
1693                                         (pkey->pkey.rsa == NULL))
1694                                         {
1695                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1696                                         goto err;
1697                                         }
1698                                 rsa=pkey->pkey.rsa;
1699                                 EVP_PKEY_free(pkey);
1700                                 }
1701
1702                         tmp_buf[0]=s->client_version>>8;
1703                         tmp_buf[1]=s->client_version&0xff;
1704                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
1705                                         goto err;
1706
1707                         s->session->master_key_length=sizeof tmp_buf;
1708
1709                         q=p;
1710                         /* Fix buf for TLS and beyond */
1711                         if (s->version > SSL3_VERSION)
1712                                 p+=2;
1713                         n=RSA_public_encrypt(sizeof tmp_buf,
1714                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
1715 #ifdef PKCS1_CHECK
1716                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
1717                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
1718 #endif
1719                         if (n <= 0)
1720                                 {
1721                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
1722                                 goto err;
1723                                 }
1724
1725                         /* Fix buf for TLS and beyond */
1726                         if (s->version > SSL3_VERSION)
1727                                 {
1728                                 s2n(n,q);
1729                                 n+=2;
1730                                 }
1731
1732                         s->session->master_key_length=
1733                                 s->method->ssl3_enc->generate_master_secret(s,
1734                                         s->session->master_key,
1735                                         tmp_buf,sizeof tmp_buf);
1736                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
1737                         }
1738 #endif
1739 #ifndef OPENSSL_NO_KRB5
1740                 else if (l & SSL_kKRB5)
1741                         {
1742                         krb5_error_code krb5rc;
1743                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
1744                         /*  krb5_data   krb5_ap_req;  */
1745                         krb5_data       *enc_ticket;
1746                         krb5_data       authenticator, *authp = NULL;
1747                         EVP_CIPHER_CTX  ciph_ctx;
1748                         EVP_CIPHER      *enc = NULL;
1749                         unsigned char   iv[EVP_MAX_IV_LENGTH];
1750                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1751                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH
1752                                                 + EVP_MAX_IV_LENGTH];
1753                         int             padl, outl = sizeof(epms);
1754
1755                         EVP_CIPHER_CTX_init(&ciph_ctx);
1756
1757 #ifdef KSSL_DEBUG
1758                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
1759                                 l, SSL_kKRB5);
1760 #endif  /* KSSL_DEBUG */
1761
1762                         authp = NULL;
1763 #ifdef KRB5SENDAUTH
1764                         if (KRB5SENDAUTH)  authp = &authenticator;
1765 #endif  /* KRB5SENDAUTH */
1766
1767                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
1768                                 &kssl_err);
1769                         enc = kssl_map_enc(kssl_ctx->enctype);
1770                         if (enc == NULL)
1771                             goto err;
1772 #ifdef KSSL_DEBUG
1773                         {
1774                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
1775                         if (krb5rc && kssl_err.text)
1776                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
1777                         }
1778 #endif  /* KSSL_DEBUG */
1779
1780                         if (krb5rc)
1781                                 {
1782                                 ssl3_send_alert(s,SSL3_AL_FATAL,
1783                                                 SSL_AD_HANDSHAKE_FAILURE);
1784                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1785                                                 kssl_err.reason);
1786                                 goto err;
1787                                 }
1788
1789                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
1790                         **  in place of RFC 2712 KerberosWrapper, as in:
1791                         **
1792                         **  Send ticket (copy to *p, set n = length)
1793                         **  n = krb5_ap_req.length;
1794                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
1795                         **  if (krb5_ap_req.data)
1796                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
1797                         **
1798                         **  Now using real RFC 2712 KerberosWrapper
1799                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
1800                         **  Note: 2712 "opaque" types are here replaced
1801                         **  with a 2-byte length followed by the value.
1802                         **  Example:
1803                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
1804                         **  Where "xx xx" = length bytes.  Shown here with
1805                         **  optional authenticator omitted.
1806                         */
1807
1808                         /*  KerberosWrapper.Ticket              */
1809                         s2n(enc_ticket->length,p);
1810                         memcpy(p, enc_ticket->data, enc_ticket->length);
1811                         p+= enc_ticket->length;
1812                         n = enc_ticket->length + 2;
1813
1814                         /*  KerberosWrapper.Authenticator       */
1815                         if (authp  &&  authp->length)
1816                                 {
1817                                 s2n(authp->length,p);
1818                                 memcpy(p, authp->data, authp->length);
1819                                 p+= authp->length;
1820                                 n+= authp->length + 2;
1821
1822                                 free(authp->data);
1823                                 authp->data = NULL;
1824                                 authp->length = 0;
1825                                 }
1826                         else
1827                                 {
1828                                 s2n(0,p);/*  null authenticator length  */
1829                                 n+=2;
1830                                 }
1831
1832                         if (RAND_bytes(tmp_buf,sizeof tmp_buf) <= 0)
1833                             goto err;
1834
1835                         /*  20010420 VRS.  Tried it this way; failed.
1836                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
1837                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
1838                         **                              kssl_ctx->length);
1839                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
1840                         */
1841
1842                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
1843                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
1844                                 kssl_ctx->key,iv);
1845                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
1846                                 sizeof tmp_buf);
1847                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
1848                         outl += padl;
1849                         if (outl > sizeof epms)
1850                                 {
1851                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1852                                 goto err;
1853                                 }
1854                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
1855
1856                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
1857                         s2n(outl,p);
1858                         memcpy(p, epms, outl);
1859                         p+=outl;
1860                         n+=outl + 2;
1861
1862                         s->session->master_key_length=
1863                                 s->method->ssl3_enc->generate_master_secret(s,
1864                                         s->session->master_key,
1865                                         tmp_buf, sizeof tmp_buf);
1866
1867                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
1868                         OPENSSL_cleanse(epms, outl);
1869                         }
1870 #endif
1871 #ifndef OPENSSL_NO_DH
1872                 else if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1873                         {
1874                         DH *dh_srvr,*dh_clnt;
1875
1876                         if (s->session->sess_cert->peer_dh_tmp != NULL)
1877                                 dh_srvr=s->session->sess_cert->peer_dh_tmp;
1878                         else
1879                                 {
1880                                 /* we get them from the cert */
1881                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1882                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
1883                                 goto err;
1884                                 }
1885
1886                         /* generate a new random key */
1887                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
1888                                 {
1889                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1890                                 goto err;
1891                                 }
1892                         if (!DH_generate_key(dh_clnt))
1893                                 {
1894                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1895                                 goto err;
1896                                 }
1897
1898                         /* use the 'p' output buffer for the DH key, but
1899                          * make sure to clear it out afterwards */
1900
1901                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
1902
1903                         if (n <= 0)
1904                                 {
1905                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1906                                 goto err;
1907                                 }
1908
1909                         /* generate master key from the result */
1910                         s->session->master_key_length=
1911                                 s->method->ssl3_enc->generate_master_secret(s,
1912                                         s->session->master_key,p,n);
1913                         /* clean up */
1914                         memset(p,0,n);
1915
1916                         /* send off the data */
1917                         n=BN_num_bytes(dh_clnt->pub_key);
1918                         s2n(n,p);
1919                         BN_bn2bin(dh_clnt->pub_key,p);
1920                         n+=2;
1921
1922                         DH_free(dh_clnt);
1923
1924                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
1925                         }
1926 #endif
1927
1928 #ifndef OPENSSL_NO_ECDH
1929                 else if ((l & SSL_kECDH) || (l & SSL_kECDHE))
1930                         {
1931                         const EC_GROUP *srvr_group = NULL;
1932                         EC_KEY *tkey;
1933                         int ecdh_clnt_cert = 0;
1934                         int field_size = 0;
1935
1936                         /* Did we send out the client's
1937                          * ECDH share for use in premaster
1938                          * computation as part of client certificate?
1939                          * If so, set ecdh_clnt_cert to 1.
1940                          */
1941                         if ((l & SSL_kECDH) && (s->cert != NULL))
1942                                 {
1943                                 /* XXX: For now, we do not support client
1944                                  * authentication using ECDH certificates.
1945                                  * To add such support, one needs to add
1946                                  * code that checks for appropriate
1947                                  * conditions and sets ecdh_clnt_cert to 1.
1948                                  * For example, the cert have an ECC
1949                                  * key on the same curve as the server's
1950                                  * and the key should be authorized for
1951                                  * key agreement.
1952                                  *
1953                                  * One also needs to add code in ssl3_connect
1954                                  * to skip sending the certificate verify
1955                                  * message.
1956                                  *
1957                                  * if ((s->cert->key->privatekey != NULL) &&
1958                                  *     (s->cert->key->privatekey->type ==
1959                                  *      EVP_PKEY_EC) && ...)
1960                                  * ecdh_clnt_cert = 1;
1961                                  */
1962                                 }
1963
1964                         if (s->session->sess_cert->peer_ecdh_tmp != NULL)
1965                                 {
1966                                 tkey = s->session->sess_cert->peer_ecdh_tmp;
1967                                 }
1968                         else
1969                                 {
1970                                 /* Get the Server Public Key from Cert */
1971                                 srvr_pub_pkey = X509_get_pubkey(s->session-> \
1972                                     sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1973                                 if ((srvr_pub_pkey == NULL) ||
1974                                     (srvr_pub_pkey->type != EVP_PKEY_EC) ||
1975                                     (srvr_pub_pkey->pkey.ec == NULL))
1976                                         {
1977                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1978                                             ERR_R_INTERNAL_ERROR);
1979                                         goto err;
1980                                         }
1981
1982                                 tkey = srvr_pub_pkey->pkey.ec;
1983                                 }
1984
1985                         srvr_group   = EC_KEY_get0_group(tkey);
1986                         srvr_ecpoint = EC_KEY_get0_public_key(tkey);
1987
1988                         if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
1989                                 {
1990                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1991                                     ERR_R_INTERNAL_ERROR);
1992                                 goto err;
1993                                 }
1994
1995                         if ((clnt_ecdh=EC_KEY_new()) == NULL)
1996                                 {
1997                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1998                                 goto err;
1999                                 }
2000
2001                         if (!EC_KEY_set_group(clnt_ecdh, srvr_group))
2002                                 {
2003                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2004                                 goto err;
2005                                 }
2006                         if (ecdh_clnt_cert)
2007                                 {
2008                                 /* Reuse key info from our certificate
2009                                  * We only need our private key to perform
2010                                  * the ECDH computation.
2011                                  */
2012                                 const BIGNUM *priv_key;
2013                                 tkey = s->cert->key->privatekey->pkey.ec;
2014                                 priv_key = EC_KEY_get0_private_key(tkey);
2015                                 if (priv_key == NULL)
2016                                         {
2017                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2018                                         goto err;
2019                                         }
2020                                 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key))
2021                                         {
2022                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2023                                         goto err;
2024                                         }
2025                                 }
2026                         else
2027                                 {
2028                                 /* Generate a new ECDH key pair */
2029                                 if (!(EC_KEY_generate_key(clnt_ecdh)))
2030                                         {
2031                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2032                                         goto err;
2033                                         }
2034                                 }
2035
2036                         /* use the 'p' output buffer for the ECDH key, but
2037                          * make sure to clear it out afterwards
2038                          */
2039
2040                         field_size = EC_GROUP_get_degree(srvr_group);
2041                         if (field_size <= 0)
2042                                 {
2043                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2044                                        ERR_R_ECDH_LIB);
2045                                 goto err;
2046                                 }
2047                         n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
2048                         if (n <= 0)
2049                                 {
2050                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2051                                        ERR_R_ECDH_LIB);
2052                                 goto err;
2053                                 }
2054
2055                         /* generate master key from the result */
2056                         s->session->master_key_length = s->method->ssl3_enc \
2057                             -> generate_master_secret(s,
2058                                 s->session->master_key,
2059                                 p, n);
2060
2061                         memset(p, 0, n); /* clean up */
2062
2063                         if (ecdh_clnt_cert)
2064                                 {
2065                                 /* Send empty client key exch message */
2066                                 n = 0;
2067                                 }
2068                         else
2069                                 {
2070                                 /* First check the size of encoding and
2071                                  * allocate memory accordingly.
2072                                  */
2073                                 encoded_pt_len =
2074                                     EC_POINT_point2oct(srvr_group,
2075                                         EC_KEY_get0_public_key(clnt_ecdh),
2076                                         POINT_CONVERSION_UNCOMPRESSED,
2077                                         NULL, 0, NULL);
2078
2079                                 encodedPoint = (unsigned char *)
2080                                     OPENSSL_malloc(encoded_pt_len *
2081                                         sizeof(unsigned char));
2082                                 bn_ctx = BN_CTX_new();
2083                                 if ((encodedPoint == NULL) ||
2084                                     (bn_ctx == NULL))
2085                                         {
2086                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2087                                         goto err;
2088                                         }
2089
2090                                 /* Encode the public key */
2091                                 n = EC_POINT_point2oct(srvr_group,
2092                                     EC_KEY_get0_public_key(clnt_ecdh),
2093                                     POINT_CONVERSION_UNCOMPRESSED,
2094                                     encodedPoint, encoded_pt_len, bn_ctx);
2095
2096                                 *p = n; /* length of encoded point */
2097                                 /* Encoded point will be copied here */
2098                                 p += 1;
2099                                 /* copy the point */
2100                                 memcpy((unsigned char *)p, encodedPoint, n);
2101                                 /* increment n to account for length field */
2102                                 n += 1;
2103                                 }
2104
2105                         /* Free allocated memory */
2106                         BN_CTX_free(bn_ctx);
2107                         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2108                         if (clnt_ecdh != NULL)
2109                                  EC_KEY_free(clnt_ecdh);
2110                         EVP_PKEY_free(srvr_pub_pkey);
2111                         }
2112 #endif /* !OPENSSL_NO_ECDH */
2113                 else
2114                         {
2115                         ssl3_send_alert(s, SSL3_AL_FATAL,
2116                             SSL_AD_HANDSHAKE_FAILURE);
2117                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2118                             ERR_R_INTERNAL_ERROR);
2119                         goto err;
2120                         }
2121
2122                 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
2123                 l2n3(n,d);
2124
2125                 s->state=SSL3_ST_CW_KEY_EXCH_B;
2126                 /* number of bytes to write */
2127                 s->init_num=n+4;
2128                 s->init_off=0;
2129                 }
2130
2131         /* SSL3_ST_CW_KEY_EXCH_B */
2132         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2133 err:
2134 #ifndef OPENSSL_NO_ECDH
2135         BN_CTX_free(bn_ctx);
2136         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2137         if (clnt_ecdh != NULL)
2138                 EC_KEY_free(clnt_ecdh);
2139         EVP_PKEY_free(srvr_pub_pkey);
2140 #endif
2141         return(-1);
2142         }
2143
2144 int ssl3_send_client_verify(SSL *s)
2145         {
2146         unsigned char *p,*d;
2147         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
2148         EVP_PKEY *pkey;
2149 #ifndef OPENSSL_NO_RSA
2150         unsigned u=0;
2151 #endif
2152         unsigned long n;
2153 #if !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_ECDSA)
2154         int j;
2155 #endif
2156
2157         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
2158                 {
2159                 d=(unsigned char *)s->init_buf->data;
2160                 p= &(d[4]);
2161                 pkey=s->cert->key->privatekey;
2162
2163                 s->method->ssl3_enc->cert_verify_mac(s,&(s->s3->finish_dgst2),
2164                         &(data[MD5_DIGEST_LENGTH]));
2165
2166 #ifndef OPENSSL_NO_RSA
2167                 if (pkey->type == EVP_PKEY_RSA)
2168                         {
2169                         s->method->ssl3_enc->cert_verify_mac(s,
2170                                 &(s->s3->finish_dgst1),&(data[0]));
2171                         if (RSA_sign(NID_md5_sha1, data,
2172                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
2173                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
2174                                 {
2175                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
2176                                 goto err;
2177                                 }
2178                         s2n(u,p);
2179                         n=u+2;
2180                         }
2181                 else
2182 #endif
2183 #ifndef OPENSSL_NO_DSA
2184                         if (pkey->type == EVP_PKEY_DSA)
2185                         {
2186                         if (!DSA_sign(pkey->save_type,
2187                                 &(data[MD5_DIGEST_LENGTH]),
2188                                 SHA_DIGEST_LENGTH,&(p[2]),
2189                                 (unsigned int *)&j,pkey->pkey.dsa))
2190                                 {
2191                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
2192                                 goto err;
2193                                 }
2194                         s2n(j,p);
2195                         n=j+2;
2196                         }
2197                 else
2198 #endif
2199 #ifndef OPENSSL_NO_ECDSA
2200                         if (pkey->type == EVP_PKEY_EC)
2201                         {
2202                         if (!ECDSA_sign(pkey->save_type,
2203                                 &(data[MD5_DIGEST_LENGTH]),
2204                                 SHA_DIGEST_LENGTH,&(p[2]),
2205                                 (unsigned int *)&j,pkey->pkey.ec))
2206                                 {
2207                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
2208                                     ERR_R_ECDSA_LIB);
2209                                 goto err;
2210                                 }
2211                         s2n(j,p);
2212                         n=j+2;
2213                         }
2214                 else
2215 #endif
2216                         {
2217                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
2218                         goto err;
2219                         }
2220                 *(d++)=SSL3_MT_CERTIFICATE_VERIFY;
2221                 l2n3(n,d);
2222
2223                 s->state=SSL3_ST_CW_CERT_VRFY_B;
2224                 s->init_num=(int)n+4;
2225                 s->init_off=0;
2226                 }
2227         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2228 err:
2229         return(-1);
2230         }
2231
2232 int ssl3_send_client_certificate(SSL *s)
2233         {
2234         X509 *x509=NULL;
2235         EVP_PKEY *pkey=NULL;
2236         int i;
2237         unsigned long l;
2238
2239         if (s->state == SSL3_ST_CW_CERT_A)
2240                 {
2241                 if ((s->cert == NULL) ||
2242                         (s->cert->key->x509 == NULL) ||
2243                         (s->cert->key->privatekey == NULL))
2244                         s->state=SSL3_ST_CW_CERT_B;
2245                 else
2246                         s->state=SSL3_ST_CW_CERT_C;
2247                 }
2248
2249         /* We need to get a client cert */
2250         if (s->state == SSL3_ST_CW_CERT_B)
2251                 {
2252                 /* If we get an error, we need to
2253                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
2254                  * We then get retied later */
2255                 i=0;
2256                 if (s->ctx->client_cert_cb != NULL)
2257                         i=s->ctx->client_cert_cb(s,&(x509),&(pkey));
2258                 if (i < 0)
2259                         {
2260                         s->rwstate=SSL_X509_LOOKUP;
2261                         return(-1);
2262                         }
2263                 s->rwstate=SSL_NOTHING;
2264                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
2265                         {
2266                         s->state=SSL3_ST_CW_CERT_B;
2267                         if (    !SSL_use_certificate(s,x509) ||
2268                                 !SSL_use_PrivateKey(s,pkey))
2269                                 i=0;
2270                         }
2271                 else if (i == 1)
2272                         {
2273                         i=0;
2274                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
2275                         }
2276
2277                 if (x509 != NULL) X509_free(x509);
2278                 if (pkey != NULL) EVP_PKEY_free(pkey);
2279                 if (i == 0)
2280                         {
2281                         if (s->version == SSL3_VERSION)
2282                                 {
2283                                 s->s3->tmp.cert_req=0;
2284                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
2285                                 return(1);
2286                                 }
2287                         else
2288                                 {
2289                                 s->s3->tmp.cert_req=2;
2290                                 }
2291                         }
2292
2293                 /* Ok, we have a cert */
2294                 s->state=SSL3_ST_CW_CERT_C;
2295                 }
2296
2297         if (s->state == SSL3_ST_CW_CERT_C)
2298                 {
2299                 s->state=SSL3_ST_CW_CERT_D;
2300                 l=ssl3_output_cert_chain(s,
2301                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
2302                 s->init_num=(int)l;
2303                 s->init_off=0;
2304                 }
2305         /* SSL3_ST_CW_CERT_D */
2306         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2307         }
2308
2309 #define has_bits(i,m)   (((i)&(m)) == (m))
2310
2311 int ssl3_check_cert_and_algorithm(SSL *s)
2312         {
2313         int i,idx;
2314         long algs;
2315         EVP_PKEY *pkey=NULL;
2316         SESS_CERT *sc;
2317 #ifndef OPENSSL_NO_RSA
2318         RSA *rsa;
2319 #endif
2320 #ifndef OPENSSL_NO_DH
2321         DH *dh;
2322 #endif
2323
2324         sc=s->session->sess_cert;
2325
2326         if (sc == NULL)
2327                 {
2328                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,ERR_R_INTERNAL_ERROR);
2329                 goto err;
2330                 }
2331
2332         algs=s->s3->tmp.new_cipher->algorithms;
2333
2334         /* we don't have a certificate */
2335         if (algs & (SSL_aDH|SSL_aNULL|SSL_aKRB5))
2336                 return(1);
2337
2338 #ifndef OPENSSL_NO_RSA
2339         rsa=s->session->sess_cert->peer_rsa_tmp;
2340 #endif
2341 #ifndef OPENSSL_NO_DH
2342         dh=s->session->sess_cert->peer_dh_tmp;
2343 #endif
2344
2345         /* This is the passed certificate */
2346
2347         idx=sc->peer_cert_type;
2348 #ifndef OPENSSL_NO_ECDH
2349         if (idx == SSL_PKEY_ECC)
2350                 {
2351                 if (check_srvr_ecc_cert_and_alg(sc->peer_pkeys[idx].x509,
2352                     s->s3->tmp.new_cipher) == 0)
2353                         { /* check failed */
2354                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_BAD_ECC_CERT);
2355                         goto f_err;
2356                         }
2357                 else
2358                         {
2359                         return 1;
2360                         }
2361                 }
2362 #endif
2363         pkey=X509_get_pubkey(sc->peer_pkeys[idx].x509);
2364         i=X509_certificate_type(sc->peer_pkeys[idx].x509,pkey);
2365         EVP_PKEY_free(pkey);
2366
2367
2368         /* Check that we have a certificate if we require one */
2369         if ((algs & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
2370                 {
2371                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
2372                 goto f_err;
2373                 }
2374 #ifndef OPENSSL_NO_DSA
2375         else if ((algs & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
2376                 {
2377                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
2378                 goto f_err;
2379                 }
2380 #endif
2381 #ifndef OPENSSL_NO_RSA
2382         if ((algs & SSL_kRSA) &&
2383                 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
2384                 {
2385                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
2386                 goto f_err;
2387                 }
2388 #endif
2389 #ifndef OPENSSL_NO_DH
2390         if ((algs & SSL_kEDH) &&
2391                 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
2392                 {
2393                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
2394                 goto f_err;
2395                 }
2396         else if ((algs & SSL_kDHr) && !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
2397                 {
2398                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
2399                 goto f_err;
2400                 }
2401 #ifndef OPENSSL_NO_DSA
2402         else if ((algs & SSL_kDHd) && !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
2403                 {
2404                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
2405                 goto f_err;
2406                 }
2407 #endif
2408 #endif
2409
2410         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i,EVP_PKT_EXP))
2411                 {
2412 #ifndef OPENSSL_NO_RSA
2413                 if (algs & SSL_kRSA)
2414                         {
2415                         if (rsa == NULL
2416                             || RSA_size(rsa)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
2417                                 {
2418                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
2419                                 goto f_err;
2420                                 }
2421                         }
2422                 else
2423 #endif
2424 #ifndef OPENSSL_NO_DH
2425                         if (algs & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2426                             {
2427                             if (dh == NULL
2428                                 || DH_size(dh)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
2429                                 {
2430                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
2431                                 goto f_err;
2432                                 }
2433                         }
2434                 else
2435 #endif
2436                         {
2437                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
2438                         goto f_err;
2439                         }
2440                 }
2441         return(1);
2442 f_err:
2443         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
2444 err:
2445         return(0);
2446         }
2447
2448
2449 #ifndef OPENSSL_NO_ECDH
2450 /* This is the complement of nid2curve_id in s3_srvr.c. */
2451 static int curve_id2nid(int curve_id)
2452 {
2453         /* ECC curves from draft-ietf-tls-ecc-01.txt (Mar 15, 2001)
2454          * (no changes in draft-ietf-tls-ecc-03.txt [June 2003]) */
2455         static int nid_list[26] =
2456         {
2457                 0,
2458                 NID_sect163k1, /* sect163k1 (1) */
2459                 NID_sect163r1, /* sect163r1 (2) */
2460                 NID_sect163r2, /* sect163r2 (3) */
2461                 NID_sect193r1, /* sect193r1 (4) */
2462                 NID_sect193r2, /* sect193r2 (5) */
2463                 NID_sect233k1, /* sect233k1 (6) */
2464                 NID_sect233r1, /* sect233r1 (7) */
2465                 NID_sect239k1, /* sect239k1 (8) */
2466                 NID_sect283k1, /* sect283k1 (9) */
2467                 NID_sect283r1, /* sect283r1 (10) */
2468                 NID_sect409k1, /* sect409k1 (11) */
2469                 NID_sect409r1, /* sect409r1 (12) */
2470                 NID_sect571k1, /* sect571k1 (13) */
2471                 NID_sect571r1, /* sect571r1 (14) */
2472                 NID_secp160k1, /* secp160k1 (15) */
2473                 NID_secp160r1, /* secp160r1 (16) */
2474                 NID_secp160r2, /* secp160r2 (17) */
2475                 NID_secp192k1, /* secp192k1 (18) */
2476                 NID_X9_62_prime192v1, /* secp192r1 (19) */
2477                 NID_secp224k1, /* secp224k1 (20) */
2478                 NID_secp224r1, /* secp224r1 (21) */
2479                 NID_secp256k1, /* secp256k1 (22) */
2480                 NID_X9_62_prime256v1, /* secp256r1 (23) */
2481                 NID_secp384r1, /* secp384r1 (24) */
2482                 NID_secp521r1  /* secp521r1 (25) */
2483         };
2484
2485         if ((curve_id < 1) || (curve_id > 25)) return 0;
2486
2487         return nid_list[curve_id];
2488 }
2489 #endif