ssl/s3_clnt.c

   1 /* ssl/s3_clnt.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58 /* ====================================================================
  59  * Copyright (c) 1998-2003 The OpenSSL Project.  All rights reserved.
  60  *
  61  * Redistribution and use in source and binary forms, with or without
  62  * modification, are permitted provided that the following conditions
  63  * are met:
  64  *
  65  * 1. Redistributions of source code must retain the above copyright
  66  *    notice, this list of conditions and the following disclaimer.
  67  *
  68  * 2. Redistributions in binary form must reproduce the above copyright
  69  *    notice, this list of conditions and the following disclaimer in
  70  *    the documentation and/or other materials provided with the
  71  *    distribution.
  72  *
  73  * 3. All advertising materials mentioning features or use of this
  74  *    software must display the following acknowledgment:
  75  *    "This product includes software developed by the OpenSSL Project
  76  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  77  *
  78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  79  *    endorse or promote products derived from this software without
  80  *    prior written permission. For written permission, please contact
  81  *    openssl-core@openssl.org.
  82  *
  83  * 5. Products derived from this software may not be called "OpenSSL"
  84  *    nor may "OpenSSL" appear in their names without prior written
  85  *    permission of the OpenSSL Project.
  86  *
  87  * 6. Redistributions of any form whatsoever must retain the following
  88  *    acknowledgment:
  89  *    "This product includes software developed by the OpenSSL Project
  90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  91  *
  92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  95  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 103  * OF THE POSSIBILITY OF SUCH DAMAGE.
 104  * ====================================================================
 105  *
 106  * This product includes cryptographic software written by Eric Young
 107  * (eay@cryptsoft.com).  This product includes software written by Tim
 108  * Hudson (tjh@cryptsoft.com).
 109  *
 110  */
 111 /* ====================================================================
 112  * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
 113  *
 114  * Portions of the attached software ("Contribution") are developed by
 115  * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
 116  *
 117  * The Contribution is licensed pursuant to the OpenSSL open source
 118  * license provided above.
 119  *
 120  * ECC cipher suite support in OpenSSL originally written by
 121  * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories.
 122  *
 123  */
 124
 125 #include <stdio.h>
 126 #include "ssl_locl.h"
 127 #include "kssl_lcl.h"
 128 #include <openssl/buffer.h>
 129 #include <openssl/rand.h>
 130 #include <openssl/objects.h>
 131 #include <openssl/evp.h>
 132 #include <openssl/md5.h>
 133 #ifndef OPENSSL_NO_DH
 134 #include <openssl/dh.h>
 135 #endif
 136 #include <openssl/bn.h>
 137
 138 static 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 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                         if (s->hit)
 259                                 s->state=SSL3_ST_CR_FINISHED_A;
 260                         else
 261                                 s->state=SSL3_ST_CR_CERT_A;
 262                         s->init_num=0;
 263                         break;
 264
 265                 case SSL3_ST_CR_CERT_A:
 266                 case SSL3_ST_CR_CERT_B:
 267                         /* Check if it is anon DH/ECDH */
 268                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 269                                 {
 270                                 ret=ssl3_get_server_certificate(s);
 271                                 if (ret <= 0) goto end;
 272                                 }
 273                         else
 274                                 skip=1;
 275                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 276                         s->init_num=0;
 277                         break;
 278
 279                 case SSL3_ST_CR_KEY_EXCH_A:
 280                 case SSL3_ST_CR_KEY_EXCH_B:
 281                         ret=ssl3_get_key_exchange(s);
 282                         if (ret <= 0) goto end;
 283                         s->state=SSL3_ST_CR_CERT_REQ_A;
 284                         s->init_num=0;
 285
 286                         /* at this point we check that we have the
 287                          * required stuff from the server */
 288                         if (!ssl3_check_cert_and_algorithm(s))
 289                                 {
 290                                 ret= -1;
 291                                 goto end;
 292                                 }
 293                         break;
 294
 295                 case SSL3_ST_CR_CERT_REQ_A:
 296                 case SSL3_ST_CR_CERT_REQ_B:
 297                         ret=ssl3_get_certificate_request(s);
 298                         if (ret <= 0) goto end;
 299                         s->state=SSL3_ST_CR_SRVR_DONE_A;
 300                         s->init_num=0;
 301                         break;
 302
 303                 case SSL3_ST_CR_SRVR_DONE_A:
 304                 case SSL3_ST_CR_SRVR_DONE_B:
 305                         ret=ssl3_get_server_done(s);
 306                         if (ret <= 0) goto end;
 307                         if (s->s3->tmp.cert_req)
 308                                 s->state=SSL3_ST_CW_CERT_A;
 309                         else
 310                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
 311                         s->init_num=0;
 312
 313                         break;
 314
 315                 case SSL3_ST_CW_CERT_A:
 316                 case SSL3_ST_CW_CERT_B:
 317                 case SSL3_ST_CW_CERT_C:
 318                 case SSL3_ST_CW_CERT_D:
 319                         ret=ssl3_send_client_certificate(s);
 320                         if (ret <= 0) goto end;
 321                         s->state=SSL3_ST_CW_KEY_EXCH_A;
 322                         s->init_num=0;
 323                         break;
 324
 325                 case SSL3_ST_CW_KEY_EXCH_A:
 326                 case SSL3_ST_CW_KEY_EXCH_B:
 327                         ret=ssl3_send_client_key_exchange(s);
 328                         if (ret <= 0) goto end;
 329                         l=s->s3->tmp.new_cipher->algorithms;
 330                         /* EAY EAY EAY need to check for DH fix cert
 331                          * sent back */
 332                         /* For TLS, cert_req is set to 2, so a cert chain
 333                          * of nothing is sent, but no verify packet is sent */
 334                         /* XXX: For now, we do not support client
 335                          * authentication in ECDH cipher suites with
 336                          * ECDH (rather than ECDSA) certificates.
 337                          * We need to skip the certificate verify
 338                          * message when client's ECDH public key is sent
 339                          * inside the client certificate.
 340                          */
 341                         if (s->s3->tmp.cert_req == 1)
 342                                 {
 343                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
 344                                 }
 345                         else
 346                                 {
 347                                 s->state=SSL3_ST_CW_CHANGE_A;
 348                                 s->s3->change_cipher_spec=0;
 349                                 }
 350
 351                         s->init_num=0;
 352                         break;
 353
 354                 case SSL3_ST_CW_CERT_VRFY_A:
 355                 case SSL3_ST_CW_CERT_VRFY_B:
 356                         ret=ssl3_send_client_verify(s);
 357                         if (ret <= 0) goto end;
 358                         s->state=SSL3_ST_CW_CHANGE_A;
 359                         s->init_num=0;
 360                         s->s3->change_cipher_spec=0;
 361                         break;
 362
 363                 case SSL3_ST_CW_CHANGE_A:
 364                 case SSL3_ST_CW_CHANGE_B:
 365                         ret=ssl3_send_change_cipher_spec(s,
 366                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
 367                         if (ret <= 0) goto end;
 368                         s->state=SSL3_ST_CW_FINISHED_A;
 369                         s->init_num=0;
 370
 371                         s->session->cipher=s->s3->tmp.new_cipher;
 372 #ifdef OPENSSL_NO_COMP
 373                         s->session->compress_meth=0;
 374 #else
 375                         if (s->s3->tmp.new_compression == NULL)
 376                                 s->session->compress_meth=0;
 377                         else
 378                                 s->session->compress_meth=
 379                                         s->s3->tmp.new_compression->id;
 380 #endif
 381                         if (!s->method->ssl3_enc->setup_key_block(s))
 382                                 {
 383                                 ret= -1;
 384                                 goto end;
 385                                 }
 386
 387                         if (!s->method->ssl3_enc->change_cipher_state(s,
 388                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 389                                 {
 390                                 ret= -1;
 391                                 goto end;
 392                                 }
 393
 394                         break;
 395
 396                 case SSL3_ST_CW_FINISHED_A:
 397                 case SSL3_ST_CW_FINISHED_B:
 398                         ret=ssl3_send_finished(s,
 399                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
 400                                 s->method->ssl3_enc->client_finished_label,
 401                                 s->method->ssl3_enc->client_finished_label_len);
 402                         if (ret <= 0) goto end;
 403                         s->state=SSL3_ST_CW_FLUSH;
 404
 405                         /* clear flags */
 406                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
 407                         if (s->hit)
 408                                 {
 409                                 s->s3->tmp.next_state=SSL_ST_OK;
 410                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
 411                                         {
 412                                         s->state=SSL_ST_OK;
 413                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
 414                                         s->s3->delay_buf_pop_ret=0;
 415                                         }
 416                                 }
 417                         else
 418                                 {
 419                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
 420                                 }
 421                         s->init_num=0;
 422                         break;
 423
 424                 case SSL3_ST_CR_FINISHED_A:
 425                 case SSL3_ST_CR_FINISHED_B:
 426
 427                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
 428                                 SSL3_ST_CR_FINISHED_B);
 429                         if (ret <= 0) goto end;
 430
 431                         if (s->hit)
 432                                 s->state=SSL3_ST_CW_CHANGE_A;
 433                         else
 434                                 s->state=SSL_ST_OK;
 435                         s->init_num=0;
 436                         break;
 437
 438                 case SSL3_ST_CW_FLUSH:
 439                         /* number of bytes to be flushed */
 440                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 441                         if (num1 > 0)
 442                                 {
 443                                 s->rwstate=SSL_WRITING;
 444                                 num1=BIO_flush(s->wbio);
 445                                 if (num1 <= 0) { ret= -1; goto end; }
 446                                 s->rwstate=SSL_NOTHING;
 447                                 }
 448
 449                         s->state=s->s3->tmp.next_state;
 450                         break;
 451
 452                 case SSL_ST_OK:
 453                         /* clean a few things up */
 454                         ssl3_cleanup_key_block(s);
 455
 456                         if (s->init_buf != NULL)
 457                                 {
 458                                 BUF_MEM_free(s->init_buf);
 459                                 s->init_buf=NULL;
 460                                 }
 461
 462                         /* If we are not 'joining' the last two packets,
 463                          * remove the buffering now */
 464                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 465                                 ssl_free_wbio_buffer(s);
 466                         /* else do it later in ssl3_write */
 467
 468                         s->init_num=0;
 469                         s->new_session=0;
 470
 471                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 472                         if (s->hit) s->ctx->stats.sess_hit++;
 473
 474                         ret=1;
 475                         /* s->server=0; */
 476                         s->handshake_func=ssl3_connect;
 477                         s->ctx->stats.sess_connect_good++;
 478
 479                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 480
 481                         goto end;
 482                         /* break; */
 483
 484                 default:
 485                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_UNKNOWN_STATE);
 486                         ret= -1;
 487                         goto end;
 488                         /* break; */
 489                         }
 490
 491                 /* did we do anything */
 492                 if (!s->s3->tmp.reuse_message && !skip)
 493                         {
 494                         if (s->debug)
 495                                 {
 496                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 497                                         goto end;
 498                                 }
 499
 500                         if ((cb != NULL) && (s->state != state))
 501                                 {
 502                                 new_state=s->state;
 503                                 s->state=state;
 504                                 cb(s,SSL_CB_CONNECT_LOOP,1);
 505                                 s->state=new_state;
 506                                 }
 507                         }
 508                 skip=0;
 509                 }
 510 end:
 511         s->in_handshake--;
 512         if (buf != NULL)
 513                 BUF_MEM_free(buf);
 514         if (cb != NULL)
 515                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 516         return(ret);
 517         }
 518
 519
 520 int ssl3_client_hello(SSL *s)
 521         {
 522         unsigned char *buf;
 523         unsigned char *p,*d;
 524         int i;
 525         unsigned long Time,l;
 526 #ifndef OPENSSL_NO_COMP
 527         int j;
 528         SSL_COMP *comp;
 529 #endif
 530
 531         buf=(unsigned char *)s->init_buf->data;
 532         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
 533                 {
 534                 if ((s->session == NULL) ||
 535                         (s->session->ssl_version != s->version) ||
 536                         (s->session->not_resumable))
 537                         {
 538                         if (!ssl_get_new_session(s,0))
 539                                 goto err;
 540                         }
 541                 /* else use the pre-loaded session */
 542
 543                 p=s->s3->client_random;
 544                 Time=(unsigned long)time(NULL);                 /* Time */
 545                 l2n(Time,p);
 546                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
 547                         goto err;
 548
 549                 /* Do the message type and length last */
 550                 d=p= &(buf[4]);
 551
 552                 *(p++)=s->version>>8;
 553                 *(p++)=s->version&0xff;
 554                 s->client_version=s->version;
 555
 556                 /* Random stuff */
 557                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 558                 p+=SSL3_RANDOM_SIZE;
 559
 560                 /* Session ID */
 561                 if (s->new_session)
 562                         i=0;
 563                 else
 564                         i=s->session->session_id_length;
 565                 *(p++)=i;
 566                 if (i != 0)
 567                         {
 568                         if (i > (int)sizeof(s->session->session_id))
 569                                 {
 570                                 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 571                                 goto err;
 572                                 }
 573                         memcpy(p,s->session->session_id,i);
 574                         p+=i;
 575                         }
 576
 577                 /* Ciphers supported */
 578                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
 579                 if (i == 0)
 580                         {
 581                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 582                         goto err;
 583                         }
 584                 s2n(i,p);
 585                 p+=i;
 586
 587                 /* COMPRESSION */
 588 #ifdef OPENSSL_NO_COMP
 589                 *(p++)=1;
 590 #else
 591                 if (s->ctx->comp_methods == NULL)
 592                         j=0;
 593                 else
 594                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
 595                 *(p++)=1+j;
 596                 for (i=0; i<j; i++)
 597                         {
 598                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
 599                         *(p++)=comp->id;
 600                         }
 601 #endif
 602                 *(p++)=0; /* Add the NULL method */
 603
 604                 l=(p-d);
 605                 d=buf;
 606                 *(d++)=SSL3_MT_CLIENT_HELLO;
 607                 l2n3(l,d);
 608
 609                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 610                 /* number of bytes to write */
 611                 s->init_num=p-buf;
 612                 s->init_off=0;
 613                 }
 614
 615         /* SSL3_ST_CW_CLNT_HELLO_B */
 616         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 617 err:
 618         return(-1);
 619         }
 620
 621 int ssl3_get_server_hello(SSL *s)
 622         {
 623         STACK_OF(SSL_CIPHER) *sk;
 624         SSL_CIPHER *c;
 625         unsigned char *p,*d;
 626         int i,al,ok;
 627         unsigned int j;
 628         long n;
 629 #ifndef OPENSSL_NO_COMP
 630         SSL_COMP *comp;
 631 #endif
 632
 633         n=s->method->ssl_get_message(s,
 634                 SSL3_ST_CR_SRVR_HELLO_A,
 635                 SSL3_ST_CR_SRVR_HELLO_B,
 636                 -1,
 637                 300, /* ?? */
 638                 &ok);
 639
 640         if (!ok) return((int)n);
 641
 642         if ( SSL_version(s) == DTLS1_VERSION)
 643                 {
 644                 if ( s->s3->tmp.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST)
 645                         {
 646                         if ( s->d1->send_cookie == 0)
 647                                 {
 648                                 s->s3->tmp.reuse_message = 1;
 649                                 return 1;
 650                                 }
 651                         else /* already sent a cookie */
 652                                 {
 653                                 al=SSL_AD_UNEXPECTED_MESSAGE;
 654                                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
 655                                 goto f_err;
 656                                 }
 657                         }
 658                 }
 659
 660         if ( s->s3->tmp.message_type != SSL3_MT_SERVER_HELLO)
 661                 {
 662                 al=SSL_AD_UNEXPECTED_MESSAGE;
 663                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
 664                 goto f_err;
 665                 }
 666
 667         d=p=(unsigned char *)s->init_msg;
 668
 669         if ((p[0] != (s->version>>8)) || (p[1] != (s->version&0xff)))
 670                 {
 671                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
 672                 s->version=(s->version&0xff00)|p[1];
 673                 al=SSL_AD_PROTOCOL_VERSION;
 674                 goto f_err;
 675                 }
 676         p+=2;
 677
 678         /* load the server hello data */
 679         /* load the server random */
 680         memcpy(s->s3->server_random,p,SSL3_RANDOM_SIZE);
 681         p+=SSL3_RANDOM_SIZE;
 682
 683         /* get the session-id */
 684         j= *(p++);
 685
 686         if ((j > sizeof s->session->session_id) || (j > SSL3_SESSION_ID_SIZE))
 687                 {
 688                 al=SSL_AD_ILLEGAL_PARAMETER;
 689                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_LONG);
 690                 goto f_err;
 691                 }
 692
 693         if (j != 0 && j == s->session->session_id_length
 694             && memcmp(p,s->session->session_id,j) == 0)
 695             {
 696             if(s->sid_ctx_length != s->session->sid_ctx_length
 697                || memcmp(s->session->sid_ctx,s->sid_ctx,s->sid_ctx_length))
 698                 {
 699                 /* actually a client application bug */
 700                 al=SSL_AD_ILLEGAL_PARAMETER;
 701                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
 702                 goto f_err;
 703                 }
 704             s->hit=1;
 705             }
 706         else    /* a miss or crap from the other end */
 707                 {
 708                 /* If we were trying for session-id reuse, make a new
 709                  * SSL_SESSION so we don't stuff up other people */
 710                 s->hit=0;
 711                 if (s->session->session_id_length > 0)
 712                         {
 713                         if (!ssl_get_new_session(s,0))
 714                                 {
 715                                 al=SSL_AD_INTERNAL_ERROR;
 716                                 goto f_err;
 717                                 }
 718                         }
 719                 s->session->session_id_length=j;
 720                 memcpy(s->session->session_id,p,j); /* j could be 0 */
 721                 }
 722         p+=j;
 723         c=ssl_get_cipher_by_char(s,p);
 724         if (c == NULL)
 725                 {
 726                 /* unknown cipher */
 727                 al=SSL_AD_ILLEGAL_PARAMETER;
 728                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNKNOWN_CIPHER_RETURNED);
 729                 goto f_err;
 730                 }
 731         p+=ssl_put_cipher_by_char(s,NULL,NULL);
 732
 733         sk=ssl_get_ciphers_by_id(s);
 734         i=sk_SSL_CIPHER_find(sk,c);
 735         if (i < 0)
 736                 {
 737                 /* we did not say we would use this cipher */
 738                 al=SSL_AD_ILLEGAL_PARAMETER;
 739                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
 740                 goto f_err;
 741                 }
 742
 743         /* Depending on the session caching (internal/external), the cipher
 744            and/or cipher_id values may not be set. Make sure that
 745            cipher_id is set and use it for comparison. */
 746         if (s->session->cipher)
 747                 s->session->cipher_id = s->session->cipher->id;
 748         if (s->hit && (s->session->cipher_id != c->id))
 749                 {
 750                 if (!(s->options &
 751                         SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
 752                         {
 753                         al=SSL_AD_ILLEGAL_PARAMETER;
 754                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
 755                         goto f_err;
 756                         }
 757                 }
 758         s->s3->tmp.new_cipher=c;
 759
 760         /* lets get the compression algorithm */
 761         /* COMPRESSION */
 762 #ifdef OPENSSL_NO_COMP
 763         if (*(p++) != 0)
 764                 {
 765                 al=SSL_AD_ILLEGAL_PARAMETER;
 766                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
 767                 goto f_err;
 768                 }
 769 #else
 770         j= *(p++);
 771         if (j == 0)
 772                 comp=NULL;
 773         else
 774                 comp=ssl3_comp_find(s->ctx->comp_methods,j);
 775
 776         if ((j != 0) && (comp == NULL))
 777                 {
 778                 al=SSL_AD_ILLEGAL_PARAMETER;
 779                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
 780                 goto f_err;
 781                 }
 782         else
 783                 {
 784                 s->s3->tmp.new_compression=comp;
 785                 }
 786 #endif
 787
 788         if (p != (d+n))
 789                 {
 790                 /* wrong packet length */
 791                 al=SSL_AD_DECODE_ERROR;
 792                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
 793                 goto err;
 794                 }
 795
 796         return(1);
 797 f_err:
 798         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 799 err:
 800         return(-1);
 801         }
 802
 803 int ssl3_get_server_certificate(SSL *s)
 804         {
 805         int al,i,ok,ret= -1;
 806         unsigned long n,nc,llen,l;
 807         X509 *x=NULL;
 808         const unsigned char *q,*p;
 809         unsigned char *d;
 810         STACK_OF(X509) *sk=NULL;
 811         SESS_CERT *sc;
 812         EVP_PKEY *pkey=NULL;
 813         int need_cert = 1; /* VRS: 0=> will allow null cert if auth == KRB5 */
 814
 815         n=s->method->ssl_get_message(s,
 816                 SSL3_ST_CR_CERT_A,
 817                 SSL3_ST_CR_CERT_B,
 818                 -1,
 819                 s->max_cert_list,
 820                 &ok);
 821
 822         if (!ok) return((int)n);
 823
 824         if ((s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) ||
 825                 ((s->s3->tmp.new_cipher->algorithms & SSL_aKRB5) &&
 826                 (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)))
 827                 {
 828                 s->s3->tmp.reuse_message=1;
 829                 return(1);
 830                 }
 831
 832         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
 833                 {
 834                 al=SSL_AD_UNEXPECTED_MESSAGE;
 835                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
 836                 goto f_err;
 837                 }
 838         p=d=(unsigned char *)s->init_msg;
 839
 840         if ((sk=sk_X509_new_null()) == NULL)
 841                 {
 842                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
 843                 goto err;
 844                 }
 845
 846         n2l3(p,llen);
 847         if (llen+3 != n)
 848                 {
 849                 al=SSL_AD_DECODE_ERROR;
 850                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
 851                 goto f_err;
 852                 }
 853         for (nc=0; nc<llen; )
 854                 {
 855                 n2l3(p,l);
 856                 if ((l+nc+3) > llen)
 857                         {
 858                         al=SSL_AD_DECODE_ERROR;
 859                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
 860                         goto f_err;
 861                         }
 862
 863                 q=p;
 864                 x=d2i_X509(NULL,&q,l);
 865                 if (x == NULL)
 866                         {
 867                         al=SSL_AD_BAD_CERTIFICATE;
 868                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
 869                         goto f_err;
 870                         }
 871                 if (q != (p+l))
 872                         {
 873                         al=SSL_AD_DECODE_ERROR;
 874                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
 875                         goto f_err;
 876                         }
 877                 if (!sk_X509_push(sk,x))
 878                         {
 879                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
 880                         goto err;
 881                         }
 882                 x=NULL;
 883                 nc+=l+3;
 884                 p=q;
 885                 }
 886
 887         i=ssl_verify_cert_chain(s,sk);
 888         if ((s->verify_mode != SSL_VERIFY_NONE) && (!i)
 889 #ifndef OPENSSL_NO_KRB5
 890                 && (s->s3->tmp.new_cipher->algorithms & (SSL_MKEY_MASK|SSL_AUTH_MASK))
 891                 != (SSL_aKRB5|SSL_kKRB5)
 892 #endif /* OPENSSL_NO_KRB5 */
 893                 )
 894                 {
 895                 al=ssl_verify_alarm_type(s->verify_result);
 896                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
 897                 goto f_err;
 898                 }
 899         ERR_clear_error(); /* but we keep s->verify_result */
 900
 901         sc=ssl_sess_cert_new();
 902         if (sc == NULL) goto err;
 903
 904         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
 905         s->session->sess_cert=sc;
 906
 907         sc->cert_chain=sk;
 908         /* Inconsistency alert: cert_chain does include the peer's
 909          * certificate, which we don't include in s3_srvr.c */
 910         x=sk_X509_value(sk,0);
 911         sk=NULL;
 912         /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/
 913
 914         pkey=X509_get_pubkey(x);
 915
 916         /* VRS: allow null cert if auth == KRB5 */
 917         need_cert =     ((s->s3->tmp.new_cipher->algorithms
 918                          & (SSL_MKEY_MASK|SSL_AUTH_MASK))
 919                          == (SSL_aKRB5|SSL_kKRB5))? 0: 1;
 920
 921 #ifdef KSSL_DEBUG
 922         printf("pkey,x = %p, %p\n", pkey,x);
 923         printf("ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x,pkey));
 924         printf("cipher, alg, nc = %s, %lx, %d\n", s->s3->tmp.new_cipher->name,
 925                 s->s3->tmp.new_cipher->algorithms, need_cert);
 926 #endif    /* KSSL_DEBUG */
 927
 928         if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey)))
 929                 {
 930                 x=NULL;
 931                 al=SSL3_AL_FATAL;
 932                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
 933                         SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
 934                 goto f_err;
 935                 }
 936
 937         i=ssl_cert_type(x,pkey);
 938         if (need_cert && i < 0)
 939                 {
 940                 x=NULL;
 941                 al=SSL3_AL_FATAL;
 942                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
 943                         SSL_R_UNKNOWN_CERTIFICATE_TYPE);
 944                 goto f_err;
 945                 }
 946
 947         if (need_cert)
 948                 {
 949                 sc->peer_cert_type=i;
 950                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
 951                 /* Why would the following ever happen?
 952                  * We just created sc a couple of lines ago. */
 953                 if (sc->peer_pkeys[i].x509 != NULL)
 954                         X509_free(sc->peer_pkeys[i].x509);
 955                 sc->peer_pkeys[i].x509=x;
 956                 sc->peer_key= &(sc->peer_pkeys[i]);
 957
 958                 if (s->session->peer != NULL)
 959                         X509_free(s->session->peer);
 960                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
 961                 s->session->peer=x;
 962                 }
 963         else
 964                 {
 965                 sc->peer_cert_type=i;
 966                 sc->peer_key= NULL;
 967
 968                 if (s->session->peer != NULL)
 969                         X509_free(s->session->peer);
 970                 s->session->peer=NULL;
 971                 }
 972         s->session->verify_result = s->verify_result;
 973
 974         x=NULL;
 975         ret=1;
 976
 977         if (0)
 978                 {
 979 f_err:
 980                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
 981                 }
 982 err:
 983         EVP_PKEY_free(pkey);
 984         X509_free(x);
 985         sk_X509_pop_free(sk,X509_free);
 986         return(ret);
 987         }
 988
 989 int ssl3_get_key_exchange(SSL *s)
 990         {
 991 #ifndef OPENSSL_NO_RSA
 992         unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
 993 #endif
 994         EVP_MD_CTX md_ctx;
 995         unsigned char *param,*p;
 996         int al,i,j,param_len,ok;
 997         long n,alg;
 998         EVP_PKEY *pkey=NULL;
 999 #ifndef OPENSSL_NO_RSA
1000         RSA *rsa=NULL;
1001 #endif
1002 #ifndef OPENSSL_NO_DH
1003         DH *dh=NULL;
1004 #endif
1005 #ifndef OPENSSL_NO_ECDH
1006         EC_KEY *ecdh = NULL;
1007         BN_CTX *bn_ctx = NULL;
1008         EC_POINT *srvr_ecpoint = NULL;
1009         int curve_nid = 0;
1010         int encoded_pt_len = 0;
1011 #endif
1012
1013         /* use same message size as in ssl3_get_certificate_request()
1014          * as ServerKeyExchange message may be skipped */
1015         n=s->method->ssl_get_message(s,
1016                 SSL3_ST_CR_KEY_EXCH_A,
1017                 SSL3_ST_CR_KEY_EXCH_B,
1018                 -1,
1019                 s->max_cert_list,
1020                 &ok);
1021
1022         if (!ok) return((int)n);
1023
1024         if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
1025                 {
1026                 s->s3->tmp.reuse_message=1;
1027                 return(1);
1028                 }
1029
1030         param=p=(unsigned char *)s->init_msg;
1031
1032         if (s->session->sess_cert != NULL)
1033                 {
1034 #ifndef OPENSSL_NO_RSA
1035                 if (s->session->sess_cert->peer_rsa_tmp != NULL)
1036                         {
1037                         RSA_free(s->session->sess_cert->peer_rsa_tmp);
1038                         s->session->sess_cert->peer_rsa_tmp=NULL;
1039                         }
1040 #endif
1041 #ifndef OPENSSL_NO_DH
1042                 if (s->session->sess_cert->peer_dh_tmp)
1043                         {
1044                         DH_free(s->session->sess_cert->peer_dh_tmp);
1045                         s->session->sess_cert->peer_dh_tmp=NULL;
1046                         }
1047 #endif
1048 #ifndef OPENSSL_NO_ECDH
1049                 if (s->session->sess_cert->peer_ecdh_tmp)
1050                         {
1051                         EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp);
1052                         s->session->sess_cert->peer_ecdh_tmp=NULL;
1053                         }
1054 #endif
1055                 }
1056         else
1057                 {
1058                 s->session->sess_cert=ssl_sess_cert_new();
1059                 }
1060
1061         param_len=0;
1062         alg=s->s3->tmp.new_cipher->algorithms;
1063         EVP_MD_CTX_init(&md_ctx);
1064
1065 #ifndef OPENSSL_NO_RSA
1066         if (alg & SSL_kRSA)
1067                 {
1068                 if ((rsa=RSA_new()) == NULL)
1069                         {
1070                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1071                         goto err;
1072                         }
1073                 n2s(p,i);
1074                 param_len=i+2;
1075                 if (param_len > n)
1076                         {
1077                         al=SSL_AD_DECODE_ERROR;
1078                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
1079                         goto f_err;
1080                         }
1081                 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
1082                         {
1083                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1084                         goto err;
1085                         }
1086                 p+=i;
1087
1088                 n2s(p,i);
1089                 param_len+=i+2;
1090                 if (param_len > n)
1091                         {
1092                         al=SSL_AD_DECODE_ERROR;
1093                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
1094                         goto f_err;
1095                         }
1096                 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
1097                         {
1098                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1099                         goto err;
1100                         }
1101                 p+=i;
1102                 n-=param_len;
1103
1104                 /* this should be because we are using an export cipher */
1105                 if (alg & SSL_aRSA)
1106                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1107                 else
1108                         {
1109                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1110                         goto err;
1111                         }
1112                 s->session->sess_cert->peer_rsa_tmp=rsa;
1113                 rsa=NULL;
1114                 }
1115 #else /* OPENSSL_NO_RSA */
1116         if (0)
1117                 ;
1118 #endif
1119 #ifndef OPENSSL_NO_DH
1120         else if (alg & SSL_kEDH)
1121                 {
1122                 if ((dh=DH_new()) == NULL)
1123                         {
1124                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
1125                         goto err;
1126                         }
1127                 n2s(p,i);
1128                 param_len=i+2;
1129                 if (param_len > n)
1130                         {
1131                         al=SSL_AD_DECODE_ERROR;
1132                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
1133                         goto f_err;
1134                         }
1135                 if (!(dh->p=BN_bin2bn(p,i,NULL)))
1136                         {
1137                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1138                         goto err;
1139                         }
1140                 p+=i;
1141
1142                 n2s(p,i);
1143                 param_len+=i+2;
1144                 if (param_len > n)
1145                         {
1146                         al=SSL_AD_DECODE_ERROR;
1147                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
1148                         goto f_err;
1149                         }
1150                 if (!(dh->g=BN_bin2bn(p,i,NULL)))
1151                         {
1152                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1153                         goto err;
1154                         }
1155                 p+=i;
1156
1157                 n2s(p,i);
1158                 param_len+=i+2;
1159                 if (param_len > n)
1160                         {
1161                         al=SSL_AD_DECODE_ERROR;
1162                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
1163                         goto f_err;
1164                         }
1165                 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
1166                         {
1167                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1168                         goto err;
1169                         }
1170                 p+=i;
1171                 n-=param_len;
1172
1173 #ifndef OPENSSL_NO_RSA
1174                 if (alg & SSL_aRSA)
1175                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1176 #else
1177                 if (0)
1178                         ;
1179 #endif
1180 #ifndef OPENSSL_NO_DSA
1181                 else if (alg & SSL_aDSS)
1182                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1183 #endif
1184                 /* else anonymous DH, so no certificate or pkey. */
1185
1186                 s->session->sess_cert->peer_dh_tmp=dh;
1187                 dh=NULL;
1188                 }
1189         else if ((alg & SSL_kDHr) || (alg & SSL_kDHd))
1190                 {
1191                 al=SSL_AD_ILLEGAL_PARAMETER;
1192                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1193                 goto f_err;
1194                 }
1195 #endif /* !OPENSSL_NO_DH */
1196
1197 #ifndef OPENSSL_NO_ECDH
1198         else if (alg & SSL_kECDHE)
1199                 {
1200                 EC_GROUP *ngroup;
1201                 const EC_GROUP *group;
1202
1203                 if ((ecdh=EC_KEY_new()) == NULL)
1204                         {
1205                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1206                         goto err;
1207                         }
1208
1209                 /* Extract elliptic curve parameters and the
1210                  * server's ephemeral ECDH public key.
1211                  * Keep accumulating lengths of various components in
1212                  * param_len and make sure it never exceeds n.
1213                  */
1214
1215                 /* XXX: For now we only support named (not generic) curves
1216                  * and the ECParameters in this case is just three bytes.
1217                  */
1218                 param_len=3;
1219                 if ((param_len > n) ||
1220                     (*p != NAMED_CURVE_TYPE) ||
1221                     ((curve_nid = curve_id2nid(*(p + 2))) == 0))
1222                         {
1223                         al=SSL_AD_INTERNAL_ERROR;
1224                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
1225                         goto f_err;
1226                         }
1227
1228                 ngroup = EC_GROUP_new_by_curve_name(curve_nid);
1229                 if (ngroup == NULL)
1230                         {
1231                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1232                         goto err;
1233                         }
1234                 if (EC_KEY_set_group(ecdh, ngroup) == 0)
1235                         {
1236                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1237                         goto err;
1238                         }
1239                 EC_GROUP_free(ngroup);
1240
1241                 group = EC_KEY_get0_group(ecdh);
1242
1243                 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1244                     (EC_GROUP_get_degree(group) > 163))
1245                         {
1246                         al=SSL_AD_EXPORT_RESTRICTION;
1247                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1248                         goto f_err;
1249                         }
1250
1251                 p+=3;
1252
1253                 /* Next, get the encoded ECPoint */
1254                 if (((srvr_ecpoint = EC_POINT_new(group)) == NULL) ||
1255                     ((bn_ctx = BN_CTX_new()) == NULL))
1256                         {
1257                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1258                         goto err;
1259                         }
1260
1261                 encoded_pt_len = *p;  /* length of encoded point */
1262                 p+=1;
1263                 param_len += (1 + encoded_pt_len);
1264                 if ((param_len > n) ||
1265                     (EC_POINT_oct2point(group, srvr_ecpoint,
1266                         p, encoded_pt_len, bn_ctx) == 0))
1267                         {
1268                         al=SSL_AD_DECODE_ERROR;
1269                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_ECPOINT);
1270                         goto f_err;
1271                         }
1272
1273                 n-=param_len;
1274                 p+=encoded_pt_len;
1275
1276                 /* The ECC/TLS specification does not mention
1277                  * the use of DSA to sign ECParameters in the server
1278                  * key exchange message. We do support RSA and ECDSA.
1279                  */
1280                 if (0) ;
1281 #ifndef OPENSSL_NO_RSA
1282                 else if (alg & SSL_aRSA)
1283                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1284 #endif
1285 #ifndef OPENSSL_NO_ECDSA
1286                 else if (alg & SSL_aECDSA)
1287                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1288 #endif
1289                 /* else anonymous ECDH, so no certificate or pkey. */
1290                 EC_KEY_set_public_key(ecdh, srvr_ecpoint);
1291                 s->session->sess_cert->peer_ecdh_tmp=ecdh;
1292                 ecdh=NULL;
1293                 BN_CTX_free(bn_ctx);
1294                 EC_POINT_free(srvr_ecpoint);
1295                 srvr_ecpoint = NULL;
1296                 }
1297         else if (alg & SSL_kECDH)
1298                 {
1299                 al=SSL_AD_UNEXPECTED_MESSAGE;
1300                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1301                 goto f_err;
1302                 }
1303 #endif /* !OPENSSL_NO_ECDH */
1304         if (alg & SSL_aFZA)
1305                 {
1306                 al=SSL_AD_HANDSHAKE_FAILURE;
1307                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1308                 goto f_err;
1309                 }
1310
1311
1312         /* p points to the next byte, there are 'n' bytes left */
1313
1314         /* if it was signed, check the signature */
1315         if (pkey != NULL)
1316                 {
1317                 n2s(p,i);
1318                 n-=2;
1319                 j=EVP_PKEY_size(pkey);
1320
1321                 if ((i != n) || (n > j) || (n <= 0))
1322                         {
1323                         /* wrong packet length */
1324                         al=SSL_AD_DECODE_ERROR;
1325                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1326                         goto f_err;
1327                         }
1328
1329 #ifndef OPENSSL_NO_RSA
1330                 if (pkey->type == EVP_PKEY_RSA)
1331                         {
1332                         int num;
1333
1334                         j=0;
1335                         q=md_buf;
1336                         for (num=2; num > 0; num--)
1337                                 {
1338                                 EVP_DigestInit_ex(&md_ctx,(num == 2)
1339                                         ?s->ctx->md5:s->ctx->sha1, NULL);
1340                                 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1341                                 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1342                                 EVP_DigestUpdate(&md_ctx,param,param_len);
1343                                 EVP_DigestFinal_ex(&md_ctx,q,(unsigned int *)&i);
1344                                 q+=i;
1345                                 j+=i;
1346                                 }
1347                         i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
1348                                                                 pkey->pkey.rsa);
1349                         if (i < 0)
1350                                 {
1351                                 al=SSL_AD_DECRYPT_ERROR;
1352                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1353                                 goto f_err;
1354                                 }
1355                         if (i == 0)
1356                                 {
1357                                 /* bad signature */
1358                                 al=SSL_AD_DECRYPT_ERROR;
1359                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1360                                 goto f_err;
1361                                 }
1362                         }
1363                 else
1364 #endif
1365 #ifndef OPENSSL_NO_DSA
1366                         if (pkey->type == EVP_PKEY_DSA)
1367                         {
1368                         /* lets do DSS */
1369                         EVP_VerifyInit_ex(&md_ctx,EVP_dss1(), NULL);
1370                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1371                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1372                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1373                         if (!EVP_VerifyFinal(&md_ctx,p,(int)n,pkey))
1374                                 {
1375                                 /* bad signature */
1376                                 al=SSL_AD_DECRYPT_ERROR;
1377                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1378                                 goto f_err;
1379                                 }
1380                         }
1381                 else
1382 #endif
1383 #ifndef OPENSSL_NO_ECDSA
1384                         if (pkey->type == EVP_PKEY_EC)
1385                         {
1386                         /* let's do ECDSA */
1387                         EVP_VerifyInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1388                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1389                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1390                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1391                         if (!EVP_VerifyFinal(&md_ctx,p,(int)n,pkey))
1392                                 {
1393                                 /* bad signature */
1394                                 al=SSL_AD_DECRYPT_ERROR;
1395                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1396                                 goto f_err;
1397                                 }
1398                         }
1399                 else
1400 #endif
1401                         {
1402                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1403                         goto err;
1404                         }
1405                 }
1406         else
1407                 {
1408                 /* still data left over */
1409                 if (!(alg & SSL_aNULL))
1410                         {
1411                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1412                         goto err;
1413                         }
1414                 if (n != 0)
1415                         {
1416                         al=SSL_AD_DECODE_ERROR;
1417                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
1418                         goto f_err;
1419                         }
1420                 }
1421         EVP_PKEY_free(pkey);
1422         EVP_MD_CTX_cleanup(&md_ctx);
1423         return(1);
1424 f_err:
1425         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1426 err:
1427         EVP_PKEY_free(pkey);
1428 #ifndef OPENSSL_NO_RSA
1429         if (rsa != NULL)
1430                 RSA_free(rsa);
1431 #endif
1432 #ifndef OPENSSL_NO_DH
1433         if (dh != NULL)
1434                 DH_free(dh);
1435 #endif
1436 #ifndef OPENSSL_NO_ECDH
1437         BN_CTX_free(bn_ctx);
1438         EC_POINT_free(srvr_ecpoint);
1439         if (ecdh != NULL)
1440                 EC_KEY_free(ecdh);
1441 #endif
1442         EVP_MD_CTX_cleanup(&md_ctx);
1443         return(-1);
1444         }
1445
1446 int ssl3_get_certificate_request(SSL *s)
1447         {
1448         int ok,ret=0;
1449         unsigned long n,nc,l;
1450         unsigned int llen,ctype_num,i;
1451         X509_NAME *xn=NULL;
1452         const unsigned char *p,*q;
1453         unsigned char *d;
1454         STACK_OF(X509_NAME) *ca_sk=NULL;
1455
1456         n=s->method->ssl_get_message(s,
1457                 SSL3_ST_CR_CERT_REQ_A,
1458                 SSL3_ST_CR_CERT_REQ_B,
1459                 -1,
1460                 s->max_cert_list,
1461                 &ok);
1462
1463         if (!ok) return((int)n);
1464
1465         s->s3->tmp.cert_req=0;
1466
1467         if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
1468                 {
1469                 s->s3->tmp.reuse_message=1;
1470                 return(1);
1471                 }
1472
1473         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
1474                 {
1475                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1476                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
1477                 goto err;
1478                 }
1479
1480         /* TLS does not like anon-DH with client cert */
1481         if (s->version > SSL3_VERSION)
1482                 {
1483                 l=s->s3->tmp.new_cipher->algorithms;
1484                 if (l & SSL_aNULL)
1485                         {
1486                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1487                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
1488                         goto err;
1489                         }
1490                 }
1491
1492         p=d=(unsigned char *)s->init_msg;
1493
1494         if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
1495                 {
1496                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1497                 goto err;
1498                 }
1499
1500         /* get the certificate types */
1501         ctype_num= *(p++);
1502         if (ctype_num > SSL3_CT_NUMBER)
1503                 ctype_num=SSL3_CT_NUMBER;
1504         for (i=0; i<ctype_num; i++)
1505                 s->s3->tmp.ctype[i]= p[i];
1506         p+=ctype_num;
1507
1508         /* get the CA RDNs */
1509         n2s(p,llen);
1510 #if 0
1511 {
1512 FILE *out;
1513 out=fopen("/tmp/vsign.der","w");
1514 fwrite(p,1,llen,out);
1515 fclose(out);
1516 }
1517 #endif
1518
1519         if ((llen+ctype_num+2+1) != n)
1520                 {
1521                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1522                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
1523                 goto err;
1524                 }
1525
1526         for (nc=0; nc<llen; )
1527                 {
1528                 n2s(p,l);
1529                 if ((l+nc+2) > llen)
1530                         {
1531                         if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1532                                 goto cont; /* netscape bugs */
1533                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1534                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
1535                         goto err;
1536                         }
1537
1538                 q=p;
1539
1540                 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
1541                         {
1542                         /* If netscape tolerance is on, ignore errors */
1543                         if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
1544                                 goto cont;
1545                         else
1546                                 {
1547                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1548                                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
1549                                 goto err;
1550                                 }
1551                         }
1552
1553                 if (q != (p+l))
1554                         {
1555                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1556                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
1557                         goto err;
1558                         }
1559                 if (!sk_X509_NAME_push(ca_sk,xn))
1560                         {
1561                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1562                         goto err;
1563                         }
1564
1565                 p+=l;
1566                 nc+=l+2;
1567                 }
1568
1569         if (0)
1570                 {
1571 cont:
1572                 ERR_clear_error();
1573                 }
1574
1575         /* we should setup a certificate to return.... */
1576         s->s3->tmp.cert_req=1;
1577         s->s3->tmp.ctype_num=ctype_num;
1578         if (s->s3->tmp.ca_names != NULL)
1579                 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
1580         s->s3->tmp.ca_names=ca_sk;
1581         ca_sk=NULL;
1582
1583         ret=1;
1584 err:
1585         if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
1586         return(ret);
1587         }
1588
1589 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
1590         {
1591         return(X509_NAME_cmp(*a,*b));
1592         }
1593
1594 int ssl3_get_server_done(SSL *s)
1595         {
1596         int ok,ret=0;
1597         long n;
1598
1599         n=s->method->ssl_get_message(s,
1600                 SSL3_ST_CR_SRVR_DONE_A,
1601                 SSL3_ST_CR_SRVR_DONE_B,
1602                 SSL3_MT_SERVER_DONE,
1603                 30, /* should be very small, like 0 :-) */
1604                 &ok);
1605
1606         if (!ok) return((int)n);
1607         if (n > 0)
1608                 {
1609                 /* should contain no data */
1610                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1611                 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
1612                 return -1;
1613                 }
1614         ret=1;
1615         return(ret);
1616         }
1617
1618
1619 int ssl3_send_client_key_exchange(SSL *s)
1620         {
1621         unsigned char *p,*d;
1622         int n;
1623         unsigned long l;
1624 #ifndef OPENSSL_NO_RSA
1625         unsigned char *q;
1626         EVP_PKEY *pkey=NULL;
1627 #endif
1628 #ifndef OPENSSL_NO_KRB5
1629         KSSL_ERR kssl_err;
1630 #endif /* OPENSSL_NO_KRB5 */
1631 #ifndef OPENSSL_NO_ECDH
1632         EC_KEY *clnt_ecdh = NULL;
1633         const EC_POINT *srvr_ecpoint = NULL;
1634         EVP_PKEY *srvr_pub_pkey = NULL;
1635         unsigned char *encodedPoint = NULL;
1636         int encoded_pt_len = 0;
1637         BN_CTX * bn_ctx = NULL;
1638 #endif
1639
1640         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
1641                 {
1642                 d=(unsigned char *)s->init_buf->data;
1643                 p= &(d[4]);
1644
1645                 l=s->s3->tmp.new_cipher->algorithms;
1646
1647                 /* Fool emacs indentation */
1648                 if (0) {}
1649 #ifndef OPENSSL_NO_RSA
1650                 else if (l & SSL_kRSA)
1651                         {
1652                         RSA *rsa;
1653                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1654
1655                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
1656                                 rsa=s->session->sess_cert->peer_rsa_tmp;
1657                         else
1658                                 {
1659                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1660                                 if ((pkey == NULL) ||
1661                                         (pkey->type != EVP_PKEY_RSA) ||
1662                                         (pkey->pkey.rsa == NULL))
1663                                         {
1664                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1665                                         goto err;
1666                                         }
1667                                 rsa=pkey->pkey.rsa;
1668                                 EVP_PKEY_free(pkey);
1669                                 }
1670
1671                         tmp_buf[0]=s->client_version>>8;
1672                         tmp_buf[1]=s->client_version&0xff;
1673                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
1674                                         goto err;
1675
1676                         s->session->master_key_length=sizeof tmp_buf;
1677
1678                         q=p;
1679                         /* Fix buf for TLS and beyond */
1680                         if (s->version > SSL3_VERSION)
1681                                 p+=2;
1682                         n=RSA_public_encrypt(sizeof tmp_buf,
1683                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
1684 #ifdef PKCS1_CHECK
1685                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
1686                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
1687 #endif
1688                         if (n <= 0)
1689                                 {
1690                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
1691                                 goto err;
1692                                 }
1693
1694                         /* Fix buf for TLS and beyond */
1695                         if (s->version > SSL3_VERSION)
1696                                 {
1697                                 s2n(n,q);
1698                                 n+=2;
1699                                 }
1700
1701                         s->session->master_key_length=
1702                                 s->method->ssl3_enc->generate_master_secret(s,
1703                                         s->session->master_key,
1704                                         tmp_buf,sizeof tmp_buf);
1705                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
1706                         }
1707 #endif
1708 #ifndef OPENSSL_NO_KRB5
1709                 else if (l & SSL_kKRB5)
1710                         {
1711                         krb5_error_code krb5rc;
1712                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
1713                         /*  krb5_data   krb5_ap_req;  */
1714                         krb5_data       *enc_ticket;
1715                         krb5_data       authenticator, *authp = NULL;
1716                         EVP_CIPHER_CTX  ciph_ctx;
1717                         EVP_CIPHER      *enc = NULL;
1718                         unsigned char   iv[EVP_MAX_IV_LENGTH];
1719                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1720                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH
1721                                                 + EVP_MAX_IV_LENGTH];
1722                         int             padl, outl = sizeof(epms);
1723
1724                         EVP_CIPHER_CTX_init(&ciph_ctx);
1725
1726 #ifdef KSSL_DEBUG
1727                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
1728                                 l, SSL_kKRB5);
1729 #endif  /* KSSL_DEBUG */
1730
1731                         authp = NULL;
1732 #ifdef KRB5SENDAUTH
1733                         if (KRB5SENDAUTH)  authp = &authenticator;
1734 #endif  /* KRB5SENDAUTH */
1735
1736                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
1737                                 &kssl_err);
1738                         enc = kssl_map_enc(kssl_ctx->enctype);
1739                         if (enc == NULL)
1740                             goto err;
1741 #ifdef KSSL_DEBUG
1742                         {
1743                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
1744                         if (krb5rc && kssl_err.text)
1745                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
1746                         }
1747 #endif  /* KSSL_DEBUG */
1748
1749                         if (krb5rc)
1750                                 {
1751                                 ssl3_send_alert(s,SSL3_AL_FATAL,
1752                                                 SSL_AD_HANDSHAKE_FAILURE);
1753                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1754                                                 kssl_err.reason);
1755                                 goto err;
1756                                 }
1757
1758                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
1759                         **  in place of RFC 2712 KerberosWrapper, as in:
1760                         **
1761                         **  Send ticket (copy to *p, set n = length)
1762                         **  n = krb5_ap_req.length;
1763                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
1764                         **  if (krb5_ap_req.data)
1765                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
1766                         **
1767                         **  Now using real RFC 2712 KerberosWrapper
1768                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
1769                         **  Note: 2712 "opaque" types are here replaced
1770                         **  with a 2-byte length followed by the value.
1771                         **  Example:
1772                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
1773                         **  Where "xx xx" = length bytes.  Shown here with
1774                         **  optional authenticator omitted.
1775                         */
1776
1777                         /*  KerberosWrapper.Ticket              */
1778                         s2n(enc_ticket->length,p);
1779                         memcpy(p, enc_ticket->data, enc_ticket->length);
1780                         p+= enc_ticket->length;
1781                         n = enc_ticket->length + 2;
1782
1783                         /*  KerberosWrapper.Authenticator       */
1784                         if (authp  &&  authp->length)
1785                                 {
1786                                 s2n(authp->length,p);
1787                                 memcpy(p, authp->data, authp->length);
1788                                 p+= authp->length;
1789                                 n+= authp->length + 2;
1790
1791                                 free(authp->data);
1792                                 authp->data = NULL;
1793                                 authp->length = 0;
1794                                 }
1795                         else
1796                                 {
1797                                 s2n(0,p);/*  null authenticator length  */
1798                                 n+=2;
1799                                 }
1800
1801                             tmp_buf[0]=s->client_version>>8;
1802                             tmp_buf[1]=s->client_version&0xff;
1803                             if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
1804                                 goto err;
1805
1806                         /*  20010420 VRS.  Tried it this way; failed.
1807                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
1808                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
1809                         **                              kssl_ctx->length);
1810                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
1811                         */
1812
1813                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
1814                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
1815                                 kssl_ctx->key,iv);
1816                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
1817                                 sizeof tmp_buf);
1818                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
1819                         outl += padl;
1820                         if (outl > sizeof epms)
1821                                 {
1822                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1823                                 goto err;
1824                                 }
1825                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
1826
1827                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
1828                         s2n(outl,p);
1829                         memcpy(p, epms, outl);
1830                         p+=outl;
1831                         n+=outl + 2;
1832
1833                         s->session->master_key_length=
1834                                 s->method->ssl3_enc->generate_master_secret(s,
1835                                         s->session->master_key,
1836                                         tmp_buf, sizeof tmp_buf);
1837
1838                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
1839                         OPENSSL_cleanse(epms, outl);
1840                         }
1841 #endif
1842 #ifndef OPENSSL_NO_DH
1843                 else if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1844                         {
1845                         DH *dh_srvr,*dh_clnt;
1846
1847                         if (s->session->sess_cert->peer_dh_tmp != NULL)
1848                                 dh_srvr=s->session->sess_cert->peer_dh_tmp;
1849                         else
1850                                 {
1851                                 /* we get them from the cert */
1852                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1853                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
1854                                 goto err;
1855                                 }
1856
1857                         /* generate a new random key */
1858                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
1859                                 {
1860                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1861                                 goto err;
1862                                 }
1863                         if (!DH_generate_key(dh_clnt))
1864                                 {
1865                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1866                                 goto err;
1867                                 }
1868
1869                         /* use the 'p' output buffer for the DH key, but
1870                          * make sure to clear it out afterwards */
1871
1872                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
1873
1874                         if (n <= 0)
1875                                 {
1876                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1877                                 goto err;
1878                                 }
1879
1880                         /* generate master key from the result */
1881                         s->session->master_key_length=
1882                                 s->method->ssl3_enc->generate_master_secret(s,
1883                                         s->session->master_key,p,n);
1884                         /* clean up */
1885                         memset(p,0,n);
1886
1887                         /* send off the data */
1888                         n=BN_num_bytes(dh_clnt->pub_key);
1889                         s2n(n,p);
1890                         BN_bn2bin(dh_clnt->pub_key,p);
1891                         n+=2;
1892
1893                         DH_free(dh_clnt);
1894
1895                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
1896                         }
1897 #endif
1898
1899 #ifndef OPENSSL_NO_ECDH
1900                 else if ((l & SSL_kECDH) || (l & SSL_kECDHE))
1901                         {
1902                         const EC_GROUP *srvr_group = NULL;
1903                         EC_KEY *tkey;
1904                         int ecdh_clnt_cert = 0;
1905                         int field_size = 0;
1906
1907                         /* Did we send out the client's
1908                          * ECDH share for use in premaster
1909                          * computation as part of client certificate?
1910                          * If so, set ecdh_clnt_cert to 1.
1911                          */
1912                         if ((l & SSL_kECDH) && (s->cert != NULL))
1913                                 {
1914                                 /* XXX: For now, we do not support client
1915                                  * authentication using ECDH certificates.
1916                                  * To add such support, one needs to add
1917                                  * code that checks for appropriate
1918                                  * conditions and sets ecdh_clnt_cert to 1.
1919                                  * For example, the cert have an ECC
1920                                  * key on the same curve as the server's
1921                                  * and the key should be authorized for
1922                                  * key agreement.
1923                                  *
1924                                  * One also needs to add code in ssl3_connect
1925                                  * to skip sending the certificate verify
1926                                  * message.
1927                                  *
1928                                  * if ((s->cert->key->privatekey != NULL) &&
1929                                  *     (s->cert->key->privatekey->type ==
1930                                  *      EVP_PKEY_EC) && ...)
1931                                  * ecdh_clnt_cert = 1;
1932                                  */
1933                                 }
1934
1935                         if (s->session->sess_cert->peer_ecdh_tmp != NULL)
1936                                 {
1937                                 tkey = s->session->sess_cert->peer_ecdh_tmp;
1938                                 }
1939                         else
1940                                 {
1941                                 /* Get the Server Public Key from Cert */
1942                                 srvr_pub_pkey = X509_get_pubkey(s->session-> \
1943                                     sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1944                                 if ((srvr_pub_pkey == NULL) ||
1945                                     (srvr_pub_pkey->type != EVP_PKEY_EC) ||
1946                                     (srvr_pub_pkey->pkey.ec == NULL))
1947                                         {
1948                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1949                                             ERR_R_INTERNAL_ERROR);
1950                                         goto err;
1951                                         }
1952
1953                                 tkey = srvr_pub_pkey->pkey.ec;
1954                                 }
1955
1956                         srvr_group   = EC_KEY_get0_group(tkey);
1957                         srvr_ecpoint = EC_KEY_get0_public_key(tkey);
1958
1959                         if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
1960                                 {
1961                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1962                                     ERR_R_INTERNAL_ERROR);
1963                                 goto err;
1964                                 }
1965
1966                         if ((clnt_ecdh=EC_KEY_new()) == NULL)
1967                                 {
1968                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1969                                 goto err;
1970                                 }
1971
1972                         if (!EC_KEY_set_group(clnt_ecdh, srvr_group))
1973                                 {
1974                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
1975                                 goto err;
1976                                 }
1977                         if (ecdh_clnt_cert)
1978                                 {
1979                                 /* Reuse key info from our certificate
1980                                  * We only need our private key to perform
1981                                  * the ECDH computation.
1982                                  */
1983                                 const BIGNUM *priv_key;
1984                                 tkey = s->cert->key->privatekey->pkey.ec;
1985                                 priv_key = EC_KEY_get0_private_key(tkey);
1986                                 if (priv_key == NULL)
1987                                         {
1988                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1989                                         goto err;
1990                                         }
1991                                 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key))
1992                                         {
1993                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
1994                                         goto err;
1995                                         }
1996                                 }
1997                         else
1998                                 {
1999                                 /* Generate a new ECDH key pair */
2000                                 if (!(EC_KEY_generate_key(clnt_ecdh)))
2001                                         {
2002                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2003                                         goto err;
2004                                         }
2005                                 }
2006
2007                         /* use the 'p' output buffer for the ECDH key, but
2008                          * make sure to clear it out afterwards
2009                          */
2010
2011                         field_size = EC_GROUP_get_degree(srvr_group);
2012                         if (field_size <= 0)
2013                                 {
2014                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2015                                        ERR_R_ECDH_LIB);
2016                                 goto err;
2017                                 }
2018                         n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
2019                         if (n <= 0)
2020                                 {
2021                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2022                                        ERR_R_ECDH_LIB);
2023                                 goto err;
2024                                 }
2025
2026                         /* generate master key from the result */
2027                         s->session->master_key_length = s->method->ssl3_enc \
2028                             -> generate_master_secret(s,
2029                                 s->session->master_key,
2030                                 p, n);
2031
2032                         memset(p, 0, n); /* clean up */
2033
2034                         if (ecdh_clnt_cert)
2035                                 {
2036                                 /* Send empty client key exch message */
2037                                 n = 0;
2038                                 }
2039                         else
2040                                 {
2041                                 /* First check the size of encoding and
2042                                  * allocate memory accordingly.
2043                                  */
2044                                 encoded_pt_len =
2045                                     EC_POINT_point2oct(srvr_group,
2046                                         EC_KEY_get0_public_key(clnt_ecdh),
2047                                         POINT_CONVERSION_UNCOMPRESSED,
2048                                         NULL, 0, NULL);
2049
2050                                 encodedPoint = (unsigned char *)
2051                                     OPENSSL_malloc(encoded_pt_len *
2052                                         sizeof(unsigned char));
2053                                 bn_ctx = BN_CTX_new();
2054                                 if ((encodedPoint == NULL) ||
2055                                     (bn_ctx == NULL))
2056                                         {
2057                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2058                                         goto err;
2059                                         }
2060
2061                                 /* Encode the public key */
2062                                 n = EC_POINT_point2oct(srvr_group,
2063                                     EC_KEY_get0_public_key(clnt_ecdh),
2064                                     POINT_CONVERSION_UNCOMPRESSED,
2065                                     encodedPoint, encoded_pt_len, bn_ctx);
2066
2067                                 *p = n; /* length of encoded point */
2068                                 /* Encoded point will be copied here */
2069                                 p += 1;
2070                                 /* copy the point */
2071                                 memcpy((unsigned char *)p, encodedPoint, n);
2072                                 /* increment n to account for length field */
2073                                 n += 1;
2074                                 }
2075
2076                         /* Free allocated memory */
2077                         BN_CTX_free(bn_ctx);
2078                         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2079                         if (clnt_ecdh != NULL)
2080                                  EC_KEY_free(clnt_ecdh);
2081                         EVP_PKEY_free(srvr_pub_pkey);
2082                         }
2083 #endif /* !OPENSSL_NO_ECDH */
2084                 else
2085                         {
2086                         ssl3_send_alert(s, SSL3_AL_FATAL,
2087                             SSL_AD_HANDSHAKE_FAILURE);
2088                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2089                             ERR_R_INTERNAL_ERROR);
2090                         goto err;
2091                         }
2092
2093                 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
2094                 l2n3(n,d);
2095
2096                 s->state=SSL3_ST_CW_KEY_EXCH_B;
2097                 /* number of bytes to write */
2098                 s->init_num=n+4;
2099                 s->init_off=0;
2100                 }
2101
2102         /* SSL3_ST_CW_KEY_EXCH_B */
2103         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2104 err:
2105 #ifndef OPENSSL_NO_ECDH
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 #endif
2112         return(-1);
2113         }
2114
2115 int ssl3_send_client_verify(SSL *s)
2116         {
2117         unsigned char *p,*d;
2118         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
2119         EVP_PKEY *pkey;
2120 #ifndef OPENSSL_NO_RSA
2121         unsigned u=0;
2122 #endif
2123         unsigned long n;
2124 #if !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_ECDSA)
2125         int j;
2126 #endif
2127
2128         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
2129                 {
2130                 d=(unsigned char *)s->init_buf->data;
2131                 p= &(d[4]);
2132                 pkey=s->cert->key->privatekey;
2133
2134                 s->method->ssl3_enc->cert_verify_mac(s,&(s->s3->finish_dgst2),
2135                         &(data[MD5_DIGEST_LENGTH]));
2136
2137 #ifndef OPENSSL_NO_RSA
2138                 if (pkey->type == EVP_PKEY_RSA)
2139                         {
2140                         s->method->ssl3_enc->cert_verify_mac(s,
2141                                 &(s->s3->finish_dgst1),&(data[0]));
2142                         if (RSA_sign(NID_md5_sha1, data,
2143                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
2144                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
2145                                 {
2146                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
2147                                 goto err;
2148                                 }
2149                         s2n(u,p);
2150                         n=u+2;
2151                         }
2152                 else
2153 #endif
2154 #ifndef OPENSSL_NO_DSA
2155                         if (pkey->type == EVP_PKEY_DSA)
2156                         {
2157                         if (!DSA_sign(pkey->save_type,
2158                                 &(data[MD5_DIGEST_LENGTH]),
2159                                 SHA_DIGEST_LENGTH,&(p[2]),
2160                                 (unsigned int *)&j,pkey->pkey.dsa))
2161                                 {
2162                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
2163                                 goto err;
2164                                 }
2165                         s2n(j,p);
2166                         n=j+2;
2167                         }
2168                 else
2169 #endif
2170 #ifndef OPENSSL_NO_ECDSA
2171                         if (pkey->type == EVP_PKEY_EC)
2172                         {
2173                         if (!ECDSA_sign(pkey->save_type,
2174                                 &(data[MD5_DIGEST_LENGTH]),
2175                                 SHA_DIGEST_LENGTH,&(p[2]),
2176                                 (unsigned int *)&j,pkey->pkey.ec))
2177                                 {
2178                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
2179                                     ERR_R_ECDSA_LIB);
2180                                 goto err;
2181                                 }
2182                         s2n(j,p);
2183                         n=j+2;
2184                         }
2185                 else
2186 #endif
2187                         {
2188                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
2189                         goto err;
2190                         }
2191                 *(d++)=SSL3_MT_CERTIFICATE_VERIFY;
2192                 l2n3(n,d);
2193
2194                 s->state=SSL3_ST_CW_CERT_VRFY_B;
2195                 s->init_num=(int)n+4;
2196                 s->init_off=0;
2197                 }
2198         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2199 err:
2200         return(-1);
2201         }
2202
2203 int ssl3_send_client_certificate(SSL *s)
2204         {
2205         X509 *x509=NULL;
2206         EVP_PKEY *pkey=NULL;
2207         int i;
2208         unsigned long l;
2209
2210         if (s->state == SSL3_ST_CW_CERT_A)
2211                 {
2212                 if ((s->cert == NULL) ||
2213                         (s->cert->key->x509 == NULL) ||
2214                         (s->cert->key->privatekey == NULL))
2215                         s->state=SSL3_ST_CW_CERT_B;
2216                 else
2217                         s->state=SSL3_ST_CW_CERT_C;
2218                 }
2219
2220         /* We need to get a client cert */
2221         if (s->state == SSL3_ST_CW_CERT_B)
2222                 {
2223                 /* If we get an error, we need to
2224                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
2225                  * We then get retied later */
2226                 i=0;
2227                 if (s->ctx->client_cert_cb != NULL)
2228                         i=s->ctx->client_cert_cb(s,&(x509),&(pkey));
2229                 if (i < 0)
2230                         {
2231                         s->rwstate=SSL_X509_LOOKUP;
2232                         return(-1);
2233                         }
2234                 s->rwstate=SSL_NOTHING;
2235                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
2236                         {
2237                         s->state=SSL3_ST_CW_CERT_B;
2238                         if (    !SSL_use_certificate(s,x509) ||
2239                                 !SSL_use_PrivateKey(s,pkey))
2240                                 i=0;
2241                         }
2242                 else if (i == 1)
2243                         {
2244                         i=0;
2245                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
2246                         }
2247
2248                 if (x509 != NULL) X509_free(x509);
2249                 if (pkey != NULL) EVP_PKEY_free(pkey);
2250                 if (i == 0)
2251                         {
2252                         if (s->version == SSL3_VERSION)
2253                                 {
2254                                 s->s3->tmp.cert_req=0;
2255                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
2256                                 return(1);
2257                                 }
2258                         else
2259                                 {
2260                                 s->s3->tmp.cert_req=2;
2261                                 }
2262                         }
2263
2264                 /* Ok, we have a cert */
2265                 s->state=SSL3_ST_CW_CERT_C;
2266                 }
2267
2268         if (s->state == SSL3_ST_CW_CERT_C)
2269                 {
2270                 s->state=SSL3_ST_CW_CERT_D;
2271                 l=ssl3_output_cert_chain(s,
2272                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
2273                 s->init_num=(int)l;
2274                 s->init_off=0;
2275                 }
2276         /* SSL3_ST_CW_CERT_D */
2277         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2278         }
2279
2280 #define has_bits(i,m)   (((i)&(m)) == (m))
2281
2282 int ssl3_check_cert_and_algorithm(SSL *s)
2283         {
2284         int i,idx;
2285         long algs;
2286         EVP_PKEY *pkey=NULL;
2287         SESS_CERT *sc;
2288 #ifndef OPENSSL_NO_RSA
2289         RSA *rsa;
2290 #endif
2291 #ifndef OPENSSL_NO_DH
2292         DH *dh;
2293 #endif
2294
2295         sc=s->session->sess_cert;
2296
2297         algs=s->s3->tmp.new_cipher->algorithms;
2298
2299         /* we don't have a certificate */
2300         if (algs & (SSL_aDH|SSL_aNULL|SSL_aKRB5))
2301                 return(1);
2302
2303         if (sc == NULL)
2304                 {
2305                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,ERR_R_INTERNAL_ERROR);
2306                 goto err;
2307                 }
2308
2309 #ifndef OPENSSL_NO_RSA
2310         rsa=s->session->sess_cert->peer_rsa_tmp;
2311 #endif
2312 #ifndef OPENSSL_NO_DH
2313         dh=s->session->sess_cert->peer_dh_tmp;
2314 #endif
2315
2316         /* This is the passed certificate */
2317
2318         idx=sc->peer_cert_type;
2319 #ifndef OPENSSL_NO_ECDH
2320         if (idx == SSL_PKEY_ECC)
2321                 {
2322                 if (check_srvr_ecc_cert_and_alg(sc->peer_pkeys[idx].x509,
2323                     s->s3->tmp.new_cipher) == 0)
2324                         { /* check failed */
2325                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_BAD_ECC_CERT);
2326                         goto f_err;
2327                         }
2328                 else
2329                         {
2330                         return 1;
2331                         }
2332                 }
2333 #endif
2334         pkey=X509_get_pubkey(sc->peer_pkeys[idx].x509);
2335         i=X509_certificate_type(sc->peer_pkeys[idx].x509,pkey);
2336         EVP_PKEY_free(pkey);
2337
2338
2339         /* Check that we have a certificate if we require one */
2340         if ((algs & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
2341                 {
2342                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
2343                 goto f_err;
2344                 }
2345 #ifndef OPENSSL_NO_DSA
2346         else if ((algs & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
2347                 {
2348                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
2349                 goto f_err;
2350                 }
2351 #endif
2352 #ifndef OPENSSL_NO_RSA
2353         if ((algs & SSL_kRSA) &&
2354                 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
2355                 {
2356                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
2357                 goto f_err;
2358                 }
2359 #endif
2360 #ifndef OPENSSL_NO_DH
2361         if ((algs & SSL_kEDH) &&
2362                 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
2363                 {
2364                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
2365                 goto f_err;
2366                 }
2367         else if ((algs & SSL_kDHr) && !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
2368                 {
2369                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
2370                 goto f_err;
2371                 }
2372 #ifndef OPENSSL_NO_DSA
2373         else if ((algs & SSL_kDHd) && !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
2374                 {
2375                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
2376                 goto f_err;
2377                 }
2378 #endif
2379 #endif
2380
2381         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i,EVP_PKT_EXP))
2382                 {
2383 #ifndef OPENSSL_NO_RSA
2384                 if (algs & SSL_kRSA)
2385                         {
2386                         if (rsa == NULL
2387                             || RSA_size(rsa)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
2388                                 {
2389                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
2390                                 goto f_err;
2391                                 }
2392                         }
2393                 else
2394 #endif
2395 #ifndef OPENSSL_NO_DH
2396                         if (algs & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2397                             {
2398                             if (dh == NULL
2399                                 || DH_size(dh)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
2400                                 {
2401                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
2402                                 goto f_err;
2403                                 }
2404                         }
2405                 else
2406 #endif
2407                         {
2408                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
2409                         goto f_err;
2410                         }
2411                 }
2412         return(1);
2413 f_err:
2414         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
2415 err:
2416         return(0);
2417         }
2418
2419
2420 #ifndef OPENSSL_NO_ECDH
2421 /* This is the complement of nid2curve_id in s3_srvr.c. */
2422 static int curve_id2nid(int curve_id)
2423 {
2424         /* ECC curves from draft-ietf-tls-ecc-01.txt (Mar 15, 2001)
2425          * (no changes in draft-ietf-tls-ecc-03.txt [June 2003]) */
2426         static int nid_list[26] =
2427         {
2428                 0,
2429                 NID_sect163k1, /* sect163k1 (1) */
2430                 NID_sect163r1, /* sect163r1 (2) */
2431                 NID_sect163r2, /* sect163r2 (3) */
2432                 NID_sect193r1, /* sect193r1 (4) */
2433                 NID_sect193r2, /* sect193r2 (5) */
2434                 NID_sect233k1, /* sect233k1 (6) */
2435                 NID_sect233r1, /* sect233r1 (7) */
2436                 NID_sect239k1, /* sect239k1 (8) */
2437                 NID_sect283k1, /* sect283k1 (9) */
2438                 NID_sect283r1, /* sect283r1 (10) */
2439                 NID_sect409k1, /* sect409k1 (11) */
2440                 NID_sect409r1, /* sect409r1 (12) */
2441                 NID_sect571k1, /* sect571k1 (13) */
2442                 NID_sect571r1, /* sect571r1 (14) */
2443                 NID_secp160k1, /* secp160k1 (15) */
2444                 NID_secp160r1, /* secp160r1 (16) */
2445                 NID_secp160r2, /* secp160r2 (17) */
2446                 NID_secp192k1, /* secp192k1 (18) */
2447                 NID_X9_62_prime192v1, /* secp192r1 (19) */
2448                 NID_secp224k1, /* secp224k1 (20) */
2449                 NID_secp224r1, /* secp224r1 (21) */
2450                 NID_secp256k1, /* secp256k1 (22) */
2451                 NID_X9_62_prime256v1, /* secp256r1 (23) */
2452                 NID_secp384r1, /* secp384r1 (24) */
2453                 NID_secp521r1  /* secp521r1 (25) */
2454         };
2455
2456         if ((curve_id < 1) || (curve_id > 25)) return 0;
2457
2458         return nid_list[curve_id];
2459 }
2460 #endif