crypto/openssl-0.9/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                 {
 826                 s->s3->tmp.reuse_message=1;
 827                 return(1);
 828                 }
 829
 830         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
 831                 {
 832                 al=SSL_AD_UNEXPECTED_MESSAGE;
 833                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
 834                 goto f_err;
 835                 }
 836         p=d=(unsigned char *)s->init_msg;
 837
 838         if ((sk=sk_X509_new_null()) == NULL)
 839                 {
 840                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
 841                 goto err;
 842                 }
 843
 844         n2l3(p,llen);
 845         if (llen+3 != n)
 846                 {
 847                 al=SSL_AD_DECODE_ERROR;
 848                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
 849                 goto f_err;
 850                 }
 851         for (nc=0; nc<llen; )
 852                 {
 853                 n2l3(p,l);
 854                 if ((l+nc+3) > llen)
 855                         {
 856                         al=SSL_AD_DECODE_ERROR;
 857                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
 858                         goto f_err;
 859                         }
 860
 861                 q=p;
 862                 x=d2i_X509(NULL,&q,l);
 863                 if (x == NULL)
 864                         {
 865                         al=SSL_AD_BAD_CERTIFICATE;
 866                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
 867                         goto f_err;
 868                         }
 869                 if (q != (p+l))
 870                         {
 871                         al=SSL_AD_DECODE_ERROR;
 872                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
 873                         goto f_err;
 874                         }
 875                 if (!sk_X509_push(sk,x))
 876                         {
 877                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
 878                         goto err;
 879                         }
 880                 x=NULL;
 881                 nc+=l+3;
 882                 p=q;
 883                 }
 884
 885         i=ssl_verify_cert_chain(s,sk);
 886         if ((s->verify_mode != SSL_VERIFY_NONE) && (!i)
 887 #ifndef OPENSSL_NO_KRB5
 888                 && (s->s3->tmp.new_cipher->algorithms & (SSL_MKEY_MASK|SSL_AUTH_MASK))
 889                 != (SSL_aKRB5|SSL_kKRB5)
 890 #endif /* OPENSSL_NO_KRB5 */
 891                 )
 892                 {
 893                 al=ssl_verify_alarm_type(s->verify_result);
 894                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
 895                 goto f_err;
 896                 }
 897         ERR_clear_error(); /* but we keep s->verify_result */
 898
 899         sc=ssl_sess_cert_new();
 900         if (sc == NULL) goto err;
 901
 902         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
 903         s->session->sess_cert=sc;
 904
 905         sc->cert_chain=sk;
 906         /* Inconsistency alert: cert_chain does include the peer's
 907          * certificate, which we don't include in s3_srvr.c */
 908         x=sk_X509_value(sk,0);
 909         sk=NULL;
 910         /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/
 911
 912         pkey=X509_get_pubkey(x);
 913
 914         /* VRS: allow null cert if auth == KRB5 */
 915         need_cert =     ((s->s3->tmp.new_cipher->algorithms
 916                          & (SSL_MKEY_MASK|SSL_AUTH_MASK))
 917                          == (SSL_aKRB5|SSL_kKRB5))? 0: 1;
 918
 919 #ifdef KSSL_DEBUG
 920         printf("pkey,x = %p, %p\n", pkey,x);
 921         printf("ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x,pkey));
 922         printf("cipher, alg, nc = %s, %lx, %d\n", s->s3->tmp.new_cipher->name,
 923                 s->s3->tmp.new_cipher->algorithms, need_cert);
 924 #endif    /* KSSL_DEBUG */
 925
 926         if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey)))
 927                 {
 928                 x=NULL;
 929                 al=SSL3_AL_FATAL;
 930                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
 931                         SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
 932                 goto f_err;
 933                 }
 934
 935         i=ssl_cert_type(x,pkey);
 936         if (need_cert && i < 0)
 937                 {
 938                 x=NULL;
 939                 al=SSL3_AL_FATAL;
 940                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
 941                         SSL_R_UNKNOWN_CERTIFICATE_TYPE);
 942                 goto f_err;
 943                 }
 944
 945         if (need_cert)
 946                 {
 947                 sc->peer_cert_type=i;
 948                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
 949                 /* Why would the following ever happen?
 950                  * We just created sc a couple of lines ago. */
 951                 if (sc->peer_pkeys[i].x509 != NULL)
 952                         X509_free(sc->peer_pkeys[i].x509);
 953                 sc->peer_pkeys[i].x509=x;
 954                 sc->peer_key= &(sc->peer_pkeys[i]);
 955
 956                 if (s->session->peer != NULL)
 957                         X509_free(s->session->peer);
 958                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
 959                 s->session->peer=x;
 960                 }
 961         else
 962                 {
 963                 sc->peer_cert_type=i;
 964                 sc->peer_key= NULL;
 965
 966                 if (s->session->peer != NULL)
 967                         X509_free(s->session->peer);
 968                 s->session->peer=NULL;
 969                 }
 970         s->session->verify_result = s->verify_result;
 971
 972         x=NULL;
 973         ret=1;
 974
 975         if (0)
 976                 {
 977 f_err:
 978                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
 979                 }
 980 err:
 981         EVP_PKEY_free(pkey);
 982         X509_free(x);
 983         sk_X509_pop_free(sk,X509_free);
 984         return(ret);
 985         }
 986
 987 int ssl3_get_key_exchange(SSL *s)
 988         {
 989 #ifndef OPENSSL_NO_RSA
 990         unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
 991 #endif
 992         EVP_MD_CTX md_ctx;
 993         unsigned char *param,*p;
 994         int al,i,j,param_len,ok;
 995         long n,alg;
 996         EVP_PKEY *pkey=NULL;
 997 #ifndef OPENSSL_NO_RSA
 998         RSA *rsa=NULL;
 999 #endif
1000 #ifndef OPENSSL_NO_DH
1001         DH *dh=NULL;
1002 #endif
1003 #ifndef OPENSSL_NO_ECDH
1004         EC_KEY *ecdh = NULL;
1005         BN_CTX *bn_ctx = NULL;
1006         EC_POINT *srvr_ecpoint = NULL;
1007         int curve_nid = 0;
1008         int encoded_pt_len = 0;
1009 #endif
1010
1011         /* use same message size as in ssl3_get_certificate_request()
1012          * as ServerKeyExchange message may be skipped */
1013         n=s->method->ssl_get_message(s,
1014                 SSL3_ST_CR_KEY_EXCH_A,
1015                 SSL3_ST_CR_KEY_EXCH_B,
1016                 -1,
1017                 s->max_cert_list,
1018                 &ok);
1019
1020         if (!ok) return((int)n);
1021
1022         if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
1023                 {
1024                 s->s3->tmp.reuse_message=1;
1025                 return(1);
1026                 }
1027
1028         param=p=(unsigned char *)s->init_msg;
1029
1030         if (s->session->sess_cert != NULL)
1031                 {
1032 #ifndef OPENSSL_NO_RSA
1033                 if (s->session->sess_cert->peer_rsa_tmp != NULL)
1034                         {
1035                         RSA_free(s->session->sess_cert->peer_rsa_tmp);
1036                         s->session->sess_cert->peer_rsa_tmp=NULL;
1037                         }
1038 #endif
1039 #ifndef OPENSSL_NO_DH
1040                 if (s->session->sess_cert->peer_dh_tmp)
1041                         {
1042                         DH_free(s->session->sess_cert->peer_dh_tmp);
1043                         s->session->sess_cert->peer_dh_tmp=NULL;
1044                         }
1045 #endif
1046 #ifndef OPENSSL_NO_ECDH
1047                 if (s->session->sess_cert->peer_ecdh_tmp)
1048                         {
1049                         EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp);
1050                         s->session->sess_cert->peer_ecdh_tmp=NULL;
1051                         }
1052 #endif
1053                 }
1054         else
1055                 {
1056                 s->session->sess_cert=ssl_sess_cert_new();
1057                 }
1058
1059         param_len=0;
1060         alg=s->s3->tmp.new_cipher->algorithms;
1061         EVP_MD_CTX_init(&md_ctx);
1062
1063 #ifndef OPENSSL_NO_RSA
1064         if (alg & SSL_kRSA)
1065                 {
1066                 if ((rsa=RSA_new()) == NULL)
1067                         {
1068                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1069                         goto err;
1070                         }
1071                 n2s(p,i);
1072                 param_len=i+2;
1073                 if (param_len > n)
1074                         {
1075                         al=SSL_AD_DECODE_ERROR;
1076                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
1077                         goto f_err;
1078                         }
1079                 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
1080                         {
1081                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1082                         goto err;
1083                         }
1084                 p+=i;
1085
1086                 n2s(p,i);
1087                 param_len+=i+2;
1088                 if (param_len > n)
1089                         {
1090                         al=SSL_AD_DECODE_ERROR;
1091                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
1092                         goto f_err;
1093                         }
1094                 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
1095                         {
1096                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1097                         goto err;
1098                         }
1099                 p+=i;
1100                 n-=param_len;
1101
1102                 /* this should be because we are using an export cipher */
1103                 if (alg & SSL_aRSA)
1104                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1105                 else
1106                         {
1107                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1108                         goto err;
1109                         }
1110                 s->session->sess_cert->peer_rsa_tmp=rsa;
1111                 rsa=NULL;
1112                 }
1113 #else /* OPENSSL_NO_RSA */
1114         if (0)
1115                 ;
1116 #endif
1117 #ifndef OPENSSL_NO_DH
1118         else if (alg & SSL_kEDH)
1119                 {
1120                 if ((dh=DH_new()) == NULL)
1121                         {
1122                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
1123                         goto err;
1124                         }
1125                 n2s(p,i);
1126                 param_len=i+2;
1127                 if (param_len > n)
1128                         {
1129                         al=SSL_AD_DECODE_ERROR;
1130                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
1131                         goto f_err;
1132                         }
1133                 if (!(dh->p=BN_bin2bn(p,i,NULL)))
1134                         {
1135                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1136                         goto err;
1137                         }
1138                 p+=i;
1139
1140                 n2s(p,i);
1141                 param_len+=i+2;
1142                 if (param_len > n)
1143                         {
1144                         al=SSL_AD_DECODE_ERROR;
1145                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
1146                         goto f_err;
1147                         }
1148                 if (!(dh->g=BN_bin2bn(p,i,NULL)))
1149                         {
1150                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1151                         goto err;
1152                         }
1153                 p+=i;
1154
1155                 n2s(p,i);
1156                 param_len+=i+2;
1157                 if (param_len > n)
1158                         {
1159                         al=SSL_AD_DECODE_ERROR;
1160                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
1161                         goto f_err;
1162                         }
1163                 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
1164                         {
1165                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1166                         goto err;
1167                         }
1168                 p+=i;
1169                 n-=param_len;
1170
1171 #ifndef OPENSSL_NO_RSA
1172                 if (alg & SSL_aRSA)
1173                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1174 #else
1175                 if (0)
1176                         ;
1177 #endif
1178 #ifndef OPENSSL_NO_DSA
1179                 else if (alg & SSL_aDSS)
1180                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1181 #endif
1182                 /* else anonymous DH, so no certificate or pkey. */
1183
1184                 s->session->sess_cert->peer_dh_tmp=dh;
1185                 dh=NULL;
1186                 }
1187         else if ((alg & SSL_kDHr) || (alg & SSL_kDHd))
1188                 {
1189                 al=SSL_AD_ILLEGAL_PARAMETER;
1190                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1191                 goto f_err;
1192                 }
1193 #endif /* !OPENSSL_NO_DH */
1194
1195 #ifndef OPENSSL_NO_ECDH
1196         else if (alg & SSL_kECDHE)
1197                 {
1198                 EC_GROUP *ngroup;
1199                 const EC_GROUP *group;
1200
1201                 if ((ecdh=EC_KEY_new()) == NULL)
1202                         {
1203                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1204                         goto err;
1205                         }
1206
1207                 /* Extract elliptic curve parameters and the
1208                  * server's ephemeral ECDH public key.
1209                  * Keep accumulating lengths of various components in
1210                  * param_len and make sure it never exceeds n.
1211                  */
1212
1213                 /* XXX: For now we only support named (not generic) curves
1214                  * and the ECParameters in this case is just three bytes.
1215                  */
1216                 param_len=3;
1217                 if ((param_len > n) ||
1218                     (*p != NAMED_CURVE_TYPE) ||
1219                     ((curve_nid = curve_id2nid(*(p + 2))) == 0))
1220                         {
1221                         al=SSL_AD_INTERNAL_ERROR;
1222                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
1223                         goto f_err;
1224                         }
1225
1226                 ngroup = EC_GROUP_new_by_curve_name(curve_nid);
1227                 if (ngroup == NULL)
1228                         {
1229                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1230                         goto err;
1231                         }
1232                 if (EC_KEY_set_group(ecdh, ngroup) == 0)
1233                         {
1234                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1235                         goto err;
1236                         }
1237                 EC_GROUP_free(ngroup);
1238
1239                 group = EC_KEY_get0_group(ecdh);
1240
1241                 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1242                     (EC_GROUP_get_degree(group) > 163))
1243                         {
1244                         al=SSL_AD_EXPORT_RESTRICTION;
1245                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1246                         goto f_err;
1247                         }
1248
1249                 p+=3;
1250
1251                 /* Next, get the encoded ECPoint */
1252                 if (((srvr_ecpoint = EC_POINT_new(group)) == NULL) ||
1253                     ((bn_ctx = BN_CTX_new()) == NULL))
1254                         {
1255                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1256                         goto err;
1257                         }
1258
1259                 encoded_pt_len = *p;  /* length of encoded point */
1260                 p+=1;
1261                 param_len += (1 + encoded_pt_len);
1262                 if ((param_len > n) ||
1263                     (EC_POINT_oct2point(group, srvr_ecpoint,
1264                         p, encoded_pt_len, bn_ctx) == 0))
1265                         {
1266                         al=SSL_AD_DECODE_ERROR;
1267                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_ECPOINT);
1268                         goto f_err;
1269                         }
1270
1271                 n-=param_len;
1272                 p+=encoded_pt_len;
1273
1274                 /* The ECC/TLS specification does not mention
1275                  * the use of DSA to sign ECParameters in the server
1276                  * key exchange message. We do support RSA and ECDSA.
1277                  */
1278                 if (0) ;
1279 #ifndef OPENSSL_NO_RSA
1280                 else if (alg & SSL_aRSA)
1281                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1282 #endif
1283 #ifndef OPENSSL_NO_ECDSA
1284                 else if (alg & SSL_aECDSA)
1285                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1286 #endif
1287                 /* else anonymous ECDH, so no certificate or pkey. */
1288                 EC_KEY_set_public_key(ecdh, srvr_ecpoint);
1289                 s->session->sess_cert->peer_ecdh_tmp=ecdh;
1290                 ecdh=NULL;
1291                 BN_CTX_free(bn_ctx);
1292                 EC_POINT_free(srvr_ecpoint);
1293                 srvr_ecpoint = NULL;
1294                 }
1295         else if (alg & SSL_kECDH)
1296                 {
1297                 al=SSL_AD_UNEXPECTED_MESSAGE;
1298                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1299                 goto f_err;
1300                 }
1301 #endif /* !OPENSSL_NO_ECDH */
1302         if (alg & SSL_aFZA)
1303                 {
1304                 al=SSL_AD_HANDSHAKE_FAILURE;
1305                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1306                 goto f_err;
1307                 }
1308
1309
1310         /* p points to the next byte, there are 'n' bytes left */
1311
1312         /* if it was signed, check the signature */
1313         if (pkey != NULL)
1314                 {
1315                 n2s(p,i);
1316                 n-=2;
1317                 j=EVP_PKEY_size(pkey);
1318
1319                 if ((i != n) || (n > j) || (n <= 0))
1320                         {
1321                         /* wrong packet length */
1322                         al=SSL_AD_DECODE_ERROR;
1323                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1324                         goto f_err;
1325                         }
1326
1327 #ifndef OPENSSL_NO_RSA
1328                 if (pkey->type == EVP_PKEY_RSA)
1329                         {
1330                         int num;
1331
1332                         j=0;
1333                         q=md_buf;
1334                         for (num=2; num > 0; num--)
1335                                 {
1336                                 EVP_DigestInit_ex(&md_ctx,(num == 2)
1337                                         ?s->ctx->md5:s->ctx->sha1, NULL);
1338                                 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1339                                 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1340                                 EVP_DigestUpdate(&md_ctx,param,param_len);
1341                                 EVP_DigestFinal_ex(&md_ctx,q,(unsigned int *)&i);
1342                                 q+=i;
1343                                 j+=i;
1344                                 }
1345                         i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
1346                                                                 pkey->pkey.rsa);
1347                         if (i < 0)
1348                                 {
1349                                 al=SSL_AD_DECRYPT_ERROR;
1350                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1351                                 goto f_err;
1352                                 }
1353                         if (i == 0)
1354                                 {
1355                                 /* bad signature */
1356                                 al=SSL_AD_DECRYPT_ERROR;
1357                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1358                                 goto f_err;
1359                                 }
1360                         }
1361                 else
1362 #endif
1363 #ifndef OPENSSL_NO_DSA
1364                         if (pkey->type == EVP_PKEY_DSA)
1365                         {
1366                         /* lets do DSS */
1367                         EVP_VerifyInit_ex(&md_ctx,EVP_dss1(), NULL);
1368                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1369                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1370                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1371                         if (!EVP_VerifyFinal(&md_ctx,p,(int)n,pkey))
1372                                 {
1373                                 /* bad signature */
1374                                 al=SSL_AD_DECRYPT_ERROR;
1375                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1376                                 goto f_err;
1377                                 }
1378                         }
1379                 else
1380 #endif
1381 #ifndef OPENSSL_NO_ECDSA
1382                         if (pkey->type == EVP_PKEY_EC)
1383                         {
1384                         /* let's do ECDSA */
1385                         EVP_VerifyInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1386                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1387                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1388                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1389                         if (!EVP_VerifyFinal(&md_ctx,p,(int)n,pkey))
1390                                 {
1391                                 /* bad signature */
1392                                 al=SSL_AD_DECRYPT_ERROR;
1393                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1394                                 goto f_err;
1395                                 }
1396                         }
1397                 else
1398 #endif
1399                         {
1400                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1401                         goto err;
1402                         }
1403                 }
1404         else
1405                 {
1406                 /* still data left over */
1407                 if (!(alg & SSL_aNULL))
1408                         {
1409                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1410                         goto err;
1411                         }
1412                 if (n != 0)
1413                         {
1414                         al=SSL_AD_DECODE_ERROR;
1415                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
1416                         goto f_err;
1417                         }
1418                 }
1419         EVP_PKEY_free(pkey);
1420         EVP_MD_CTX_cleanup(&md_ctx);
1421         return(1);
1422 f_err:
1423         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1424 err:
1425         EVP_PKEY_free(pkey);
1426 #ifndef OPENSSL_NO_RSA
1427         if (rsa != NULL)
1428                 RSA_free(rsa);
1429 #endif
1430 #ifndef OPENSSL_NO_DH
1431         if (dh != NULL)
1432                 DH_free(dh);
1433 #endif
1434 #ifndef OPENSSL_NO_ECDH
1435         BN_CTX_free(bn_ctx);
1436         EC_POINT_free(srvr_ecpoint);
1437         if (ecdh != NULL)
1438                 EC_KEY_free(ecdh);
1439 #endif
1440         EVP_MD_CTX_cleanup(&md_ctx);
1441         return(-1);
1442         }
1443
1444 int ssl3_get_certificate_request(SSL *s)
1445         {
1446         int ok,ret=0;
1447         unsigned long n,nc,l;
1448         unsigned int llen,ctype_num,i;
1449         X509_NAME *xn=NULL;
1450         const unsigned char *p,*q;
1451         unsigned char *d;
1452         STACK_OF(X509_NAME) *ca_sk=NULL;
1453
1454         n=s->method->ssl_get_message(s,
1455                 SSL3_ST_CR_CERT_REQ_A,
1456                 SSL3_ST_CR_CERT_REQ_B,
1457                 -1,
1458                 s->max_cert_list,
1459                 &ok);
1460
1461         if (!ok) return((int)n);
1462
1463         s->s3->tmp.cert_req=0;
1464
1465         if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
1466                 {
1467                 s->s3->tmp.reuse_message=1;
1468                 return(1);
1469                 }
1470
1471         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
1472                 {
1473                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1474                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
1475                 goto err;
1476                 }
1477
1478         /* TLS does not like anon-DH with client cert */
1479         if (s->version > SSL3_VERSION)
1480                 {
1481                 l=s->s3->tmp.new_cipher->algorithms;
1482                 if (l & SSL_aNULL)
1483                         {
1484                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1485                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
1486                         goto err;
1487                         }
1488                 }
1489
1490         p=d=(unsigned char *)s->init_msg;
1491
1492         if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
1493                 {
1494                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1495                 goto err;
1496                 }
1497
1498         /* get the certificate types */
1499         ctype_num= *(p++);
1500         if (ctype_num > SSL3_CT_NUMBER)
1501                 ctype_num=SSL3_CT_NUMBER;
1502         for (i=0; i<ctype_num; i++)
1503                 s->s3->tmp.ctype[i]= p[i];
1504         p+=ctype_num;
1505
1506         /* get the CA RDNs */
1507         n2s(p,llen);
1508 #if 0
1509 {
1510 FILE *out;
1511 out=fopen("/tmp/vsign.der","w");
1512 fwrite(p,1,llen,out);
1513 fclose(out);
1514 }
1515 #endif
1516
1517         if ((llen+ctype_num+2+1) != n)
1518                 {
1519                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1520                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
1521                 goto err;
1522                 }
1523
1524         for (nc=0; nc<llen; )
1525                 {
1526                 n2s(p,l);
1527                 if ((l+nc+2) > llen)
1528                         {
1529                         if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1530                                 goto cont; /* netscape bugs */
1531                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1532                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
1533                         goto err;
1534                         }
1535
1536                 q=p;
1537
1538                 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
1539                         {
1540                         /* If netscape tolerance is on, ignore errors */
1541                         if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
1542                                 goto cont;
1543                         else
1544                                 {
1545                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1546                                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
1547                                 goto err;
1548                                 }
1549                         }
1550
1551                 if (q != (p+l))
1552                         {
1553                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1554                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
1555                         goto err;
1556                         }
1557                 if (!sk_X509_NAME_push(ca_sk,xn))
1558                         {
1559                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1560                         goto err;
1561                         }
1562
1563                 p+=l;
1564                 nc+=l+2;
1565                 }
1566
1567         if (0)
1568                 {
1569 cont:
1570                 ERR_clear_error();
1571                 }
1572
1573         /* we should setup a certificate to return.... */
1574         s->s3->tmp.cert_req=1;
1575         s->s3->tmp.ctype_num=ctype_num;
1576         if (s->s3->tmp.ca_names != NULL)
1577                 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
1578         s->s3->tmp.ca_names=ca_sk;
1579         ca_sk=NULL;
1580
1581         ret=1;
1582 err:
1583         if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
1584         return(ret);
1585         }
1586
1587 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
1588         {
1589         return(X509_NAME_cmp(*a,*b));
1590         }
1591
1592 int ssl3_get_server_done(SSL *s)
1593         {
1594         int ok,ret=0;
1595         long n;
1596
1597         n=s->method->ssl_get_message(s,
1598                 SSL3_ST_CR_SRVR_DONE_A,
1599                 SSL3_ST_CR_SRVR_DONE_B,
1600                 SSL3_MT_SERVER_DONE,
1601                 30, /* should be very small, like 0 :-) */
1602                 &ok);
1603
1604         if (!ok) return((int)n);
1605         if (n > 0)
1606                 {
1607                 /* should contain no data */
1608                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1609                 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
1610                 return -1;
1611                 }
1612         ret=1;
1613         return(ret);
1614         }
1615
1616
1617 int ssl3_send_client_key_exchange(SSL *s)
1618         {
1619         unsigned char *p,*d;
1620         int n;
1621         unsigned long l;
1622 #ifndef OPENSSL_NO_RSA
1623         unsigned char *q;
1624         EVP_PKEY *pkey=NULL;
1625 #endif
1626 #ifndef OPENSSL_NO_KRB5
1627         KSSL_ERR kssl_err;
1628 #endif /* OPENSSL_NO_KRB5 */
1629 #ifndef OPENSSL_NO_ECDH
1630         EC_KEY *clnt_ecdh = NULL;
1631         const EC_POINT *srvr_ecpoint = NULL;
1632         EVP_PKEY *srvr_pub_pkey = NULL;
1633         unsigned char *encodedPoint = NULL;
1634         int encoded_pt_len = 0;
1635         BN_CTX * bn_ctx = NULL;
1636 #endif
1637
1638         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
1639                 {
1640                 d=(unsigned char *)s->init_buf->data;
1641                 p= &(d[4]);
1642
1643                 l=s->s3->tmp.new_cipher->algorithms;
1644
1645                 /* Fool emacs indentation */
1646                 if (0) {}
1647 #ifndef OPENSSL_NO_RSA
1648                 else if (l & SSL_kRSA)
1649                         {
1650                         RSA *rsa;
1651                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1652
1653                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
1654                                 rsa=s->session->sess_cert->peer_rsa_tmp;
1655                         else
1656                                 {
1657                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1658                                 if ((pkey == NULL) ||
1659                                         (pkey->type != EVP_PKEY_RSA) ||
1660                                         (pkey->pkey.rsa == NULL))
1661                                         {
1662                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1663                                         goto err;
1664                                         }
1665                                 rsa=pkey->pkey.rsa;
1666                                 EVP_PKEY_free(pkey);
1667                                 }
1668
1669                         tmp_buf[0]=s->client_version>>8;
1670                         tmp_buf[1]=s->client_version&0xff;
1671                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
1672                                         goto err;
1673
1674                         s->session->master_key_length=sizeof tmp_buf;
1675
1676                         q=p;
1677                         /* Fix buf for TLS and beyond */
1678                         if (s->version > SSL3_VERSION)
1679                                 p+=2;
1680                         n=RSA_public_encrypt(sizeof tmp_buf,
1681                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
1682 #ifdef PKCS1_CHECK
1683                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
1684                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
1685 #endif
1686                         if (n <= 0)
1687                                 {
1688                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
1689                                 goto err;
1690                                 }
1691
1692                         /* Fix buf for TLS and beyond */
1693                         if (s->version > SSL3_VERSION)
1694                                 {
1695                                 s2n(n,q);
1696                                 n+=2;
1697                                 }
1698
1699                         s->session->master_key_length=
1700                                 s->method->ssl3_enc->generate_master_secret(s,
1701                                         s->session->master_key,
1702                                         tmp_buf,sizeof tmp_buf);
1703                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
1704                         }
1705 #endif
1706 #ifndef OPENSSL_NO_KRB5
1707                 else if (l & SSL_kKRB5)
1708                         {
1709                         krb5_error_code krb5rc;
1710                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
1711                         /*  krb5_data   krb5_ap_req;  */
1712                         krb5_data       *enc_ticket;
1713                         krb5_data       authenticator, *authp = NULL;
1714                         EVP_CIPHER_CTX  ciph_ctx;
1715                         EVP_CIPHER      *enc = NULL;
1716                         unsigned char   iv[EVP_MAX_IV_LENGTH];
1717                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1718                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH
1719                                                 + EVP_MAX_IV_LENGTH];
1720                         int             padl, outl = sizeof(epms);
1721
1722                         EVP_CIPHER_CTX_init(&ciph_ctx);
1723
1724 #ifdef KSSL_DEBUG
1725                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
1726                                 l, SSL_kKRB5);
1727 #endif  /* KSSL_DEBUG */
1728
1729                         authp = NULL;
1730 #ifdef KRB5SENDAUTH
1731                         if (KRB5SENDAUTH)  authp = &authenticator;
1732 #endif  /* KRB5SENDAUTH */
1733
1734                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
1735                                 &kssl_err);
1736                         enc = kssl_map_enc(kssl_ctx->enctype);
1737                         if (enc == NULL)
1738                             goto err;
1739 #ifdef KSSL_DEBUG
1740                         {
1741                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
1742                         if (krb5rc && kssl_err.text)
1743                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
1744                         }
1745 #endif  /* KSSL_DEBUG */
1746
1747                         if (krb5rc)
1748                                 {
1749                                 ssl3_send_alert(s,SSL3_AL_FATAL,
1750                                                 SSL_AD_HANDSHAKE_FAILURE);
1751                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1752                                                 kssl_err.reason);
1753                                 goto err;
1754                                 }
1755
1756                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
1757                         **  in place of RFC 2712 KerberosWrapper, as in:
1758                         **
1759                         **  Send ticket (copy to *p, set n = length)
1760                         **  n = krb5_ap_req.length;
1761                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
1762                         **  if (krb5_ap_req.data)
1763                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
1764                         **
1765                         **  Now using real RFC 2712 KerberosWrapper
1766                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
1767                         **  Note: 2712 "opaque" types are here replaced
1768                         **  with a 2-byte length followed by the value.
1769                         **  Example:
1770                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
1771                         **  Where "xx xx" = length bytes.  Shown here with
1772                         **  optional authenticator omitted.
1773                         */
1774
1775                         /*  KerberosWrapper.Ticket              */
1776                         s2n(enc_ticket->length,p);
1777                         memcpy(p, enc_ticket->data, enc_ticket->length);
1778                         p+= enc_ticket->length;
1779                         n = enc_ticket->length + 2;
1780
1781                         /*  KerberosWrapper.Authenticator       */
1782                         if (authp  &&  authp->length)
1783                                 {
1784                                 s2n(authp->length,p);
1785                                 memcpy(p, authp->data, authp->length);
1786                                 p+= authp->length;
1787                                 n+= authp->length + 2;
1788
1789                                 free(authp->data);
1790                                 authp->data = NULL;
1791                                 authp->length = 0;
1792                                 }
1793                         else
1794                                 {
1795                                 s2n(0,p);/*  null authenticator length  */
1796                                 n+=2;
1797                                 }
1798
1799                             tmp_buf[0]=s->client_version>>8;
1800                             tmp_buf[1]=s->client_version&0xff;
1801                             if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
1802                                 goto err;
1803
1804                         /*  20010420 VRS.  Tried it this way; failed.
1805                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
1806                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
1807                         **                              kssl_ctx->length);
1808                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
1809                         */
1810
1811                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
1812                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
1813                                 kssl_ctx->key,iv);
1814                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
1815                                 sizeof tmp_buf);
1816                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
1817                         outl += padl;
1818                         if (outl > sizeof epms)
1819                                 {
1820                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1821                                 goto err;
1822                                 }
1823                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
1824
1825                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
1826                         s2n(outl,p);
1827                         memcpy(p, epms, outl);
1828                         p+=outl;
1829                         n+=outl + 2;
1830
1831                         s->session->master_key_length=
1832                                 s->method->ssl3_enc->generate_master_secret(s,
1833                                         s->session->master_key,
1834                                         tmp_buf, sizeof tmp_buf);
1835
1836                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
1837                         OPENSSL_cleanse(epms, outl);
1838                         }
1839 #endif
1840 #ifndef OPENSSL_NO_DH
1841                 else if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1842                         {
1843                         DH *dh_srvr,*dh_clnt;
1844
1845                         if (s->session->sess_cert->peer_dh_tmp != NULL)
1846                                 dh_srvr=s->session->sess_cert->peer_dh_tmp;
1847                         else
1848                                 {
1849                                 /* we get them from the cert */
1850                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1851                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
1852                                 goto err;
1853                                 }
1854
1855                         /* generate a new random key */
1856                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
1857                                 {
1858                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1859                                 goto err;
1860                                 }
1861                         if (!DH_generate_key(dh_clnt))
1862                                 {
1863                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1864                                 goto err;
1865                                 }
1866
1867                         /* use the 'p' output buffer for the DH key, but
1868                          * make sure to clear it out afterwards */
1869
1870                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
1871
1872                         if (n <= 0)
1873                                 {
1874                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1875                                 goto err;
1876                                 }
1877
1878                         /* generate master key from the result */
1879                         s->session->master_key_length=
1880                                 s->method->ssl3_enc->generate_master_secret(s,
1881                                         s->session->master_key,p,n);
1882                         /* clean up */
1883                         memset(p,0,n);
1884
1885                         /* send off the data */
1886                         n=BN_num_bytes(dh_clnt->pub_key);
1887                         s2n(n,p);
1888                         BN_bn2bin(dh_clnt->pub_key,p);
1889                         n+=2;
1890
1891                         DH_free(dh_clnt);
1892
1893                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
1894                         }
1895 #endif
1896
1897 #ifndef OPENSSL_NO_ECDH
1898                 else if ((l & SSL_kECDH) || (l & SSL_kECDHE))
1899                         {
1900                         const EC_GROUP *srvr_group = NULL;
1901                         EC_KEY *tkey;
1902                         int ecdh_clnt_cert = 0;
1903                         int field_size = 0;
1904
1905                         /* Did we send out the client's
1906                          * ECDH share for use in premaster
1907                          * computation as part of client certificate?
1908                          * If so, set ecdh_clnt_cert to 1.
1909                          */
1910                         if ((l & SSL_kECDH) && (s->cert != NULL))
1911                                 {
1912                                 /* XXX: For now, we do not support client
1913                                  * authentication using ECDH certificates.
1914                                  * To add such support, one needs to add
1915                                  * code that checks for appropriate
1916                                  * conditions and sets ecdh_clnt_cert to 1.
1917                                  * For example, the cert have an ECC
1918                                  * key on the same curve as the server's
1919                                  * and the key should be authorized for
1920                                  * key agreement.
1921                                  *
1922                                  * One also needs to add code in ssl3_connect
1923                                  * to skip sending the certificate verify
1924                                  * message.
1925                                  *
1926                                  * if ((s->cert->key->privatekey != NULL) &&
1927                                  *     (s->cert->key->privatekey->type ==
1928                                  *      EVP_PKEY_EC) && ...)
1929                                  * ecdh_clnt_cert = 1;
1930                                  */
1931                                 }
1932
1933                         if (s->session->sess_cert->peer_ecdh_tmp != NULL)
1934                                 {
1935                                 tkey = s->session->sess_cert->peer_ecdh_tmp;
1936                                 }
1937                         else
1938                                 {
1939                                 /* Get the Server Public Key from Cert */
1940                                 srvr_pub_pkey = X509_get_pubkey(s->session-> \
1941                                     sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1942                                 if ((srvr_pub_pkey == NULL) ||
1943                                     (srvr_pub_pkey->type != EVP_PKEY_EC) ||
1944                                     (srvr_pub_pkey->pkey.ec == NULL))
1945                                         {
1946                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1947                                             ERR_R_INTERNAL_ERROR);
1948                                         goto err;
1949                                         }
1950
1951                                 tkey = srvr_pub_pkey->pkey.ec;
1952                                 }
1953
1954                         srvr_group   = EC_KEY_get0_group(tkey);
1955                         srvr_ecpoint = EC_KEY_get0_public_key(tkey);
1956
1957                         if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
1958                                 {
1959                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1960                                     ERR_R_INTERNAL_ERROR);
1961                                 goto err;
1962                                 }
1963
1964                         if ((clnt_ecdh=EC_KEY_new()) == NULL)
1965                                 {
1966                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1967                                 goto err;
1968                                 }
1969
1970                         if (!EC_KEY_set_group(clnt_ecdh, srvr_group))
1971                                 {
1972                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
1973                                 goto err;
1974                                 }
1975                         if (ecdh_clnt_cert)
1976                                 {
1977                                 /* Reuse key info from our certificate
1978                                  * We only need our private key to perform
1979                                  * the ECDH computation.
1980                                  */
1981                                 const BIGNUM *priv_key;
1982                                 tkey = s->cert->key->privatekey->pkey.ec;
1983                                 priv_key = EC_KEY_get0_private_key(tkey);
1984                                 if (priv_key == NULL)
1985                                         {
1986                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1987                                         goto err;
1988                                         }
1989                                 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key))
1990                                         {
1991                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
1992                                         goto err;
1993                                         }
1994                                 }
1995                         else
1996                                 {
1997                                 /* Generate a new ECDH key pair */
1998                                 if (!(EC_KEY_generate_key(clnt_ecdh)))
1999                                         {
2000                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2001                                         goto err;
2002                                         }
2003                                 }
2004
2005                         /* use the 'p' output buffer for the ECDH key, but
2006                          * make sure to clear it out afterwards
2007                          */
2008
2009                         field_size = EC_GROUP_get_degree(srvr_group);
2010                         if (field_size <= 0)
2011                                 {
2012                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2013                                        ERR_R_ECDH_LIB);
2014                                 goto err;
2015                                 }
2016                         n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
2017                         if (n <= 0)
2018                                 {
2019                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2020                                        ERR_R_ECDH_LIB);
2021                                 goto err;
2022                                 }
2023
2024                         /* generate master key from the result */
2025                         s->session->master_key_length = s->method->ssl3_enc \
2026                             -> generate_master_secret(s,
2027                                 s->session->master_key,
2028                                 p, n);
2029
2030                         memset(p, 0, n); /* clean up */
2031
2032                         if (ecdh_clnt_cert)
2033                                 {
2034                                 /* Send empty client key exch message */
2035                                 n = 0;
2036                                 }
2037                         else
2038                                 {
2039                                 /* First check the size of encoding and
2040                                  * allocate memory accordingly.
2041                                  */
2042                                 encoded_pt_len =
2043                                     EC_POINT_point2oct(srvr_group,
2044                                         EC_KEY_get0_public_key(clnt_ecdh),
2045                                         POINT_CONVERSION_UNCOMPRESSED,
2046                                         NULL, 0, NULL);
2047
2048                                 encodedPoint = (unsigned char *)
2049                                     OPENSSL_malloc(encoded_pt_len *
2050                                         sizeof(unsigned char));
2051                                 bn_ctx = BN_CTX_new();
2052                                 if ((encodedPoint == NULL) ||
2053                                     (bn_ctx == NULL))
2054                                         {
2055                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2056                                         goto err;
2057                                         }
2058
2059                                 /* Encode the public key */
2060                                 n = EC_POINT_point2oct(srvr_group,
2061                                     EC_KEY_get0_public_key(clnt_ecdh),
2062                                     POINT_CONVERSION_UNCOMPRESSED,
2063                                     encodedPoint, encoded_pt_len, bn_ctx);
2064
2065                                 *p = n; /* length of encoded point */
2066                                 /* Encoded point will be copied here */
2067                                 p += 1;
2068                                 /* copy the point */
2069                                 memcpy((unsigned char *)p, encodedPoint, n);
2070                                 /* increment n to account for length field */
2071                                 n += 1;
2072                                 }
2073
2074                         /* Free allocated memory */
2075                         BN_CTX_free(bn_ctx);
2076                         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2077                         if (clnt_ecdh != NULL)
2078                                  EC_KEY_free(clnt_ecdh);
2079                         EVP_PKEY_free(srvr_pub_pkey);
2080                         }
2081 #endif /* !OPENSSL_NO_ECDH */
2082                 else
2083                         {
2084                         ssl3_send_alert(s, SSL3_AL_FATAL,
2085                             SSL_AD_HANDSHAKE_FAILURE);
2086                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2087                             ERR_R_INTERNAL_ERROR);
2088                         goto err;
2089                         }
2090
2091                 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
2092                 l2n3(n,d);
2093
2094                 s->state=SSL3_ST_CW_KEY_EXCH_B;
2095                 /* number of bytes to write */
2096                 s->init_num=n+4;
2097                 s->init_off=0;
2098                 }
2099
2100         /* SSL3_ST_CW_KEY_EXCH_B */
2101         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2102 err:
2103 #ifndef OPENSSL_NO_ECDH
2104         BN_CTX_free(bn_ctx);
2105         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2106         if (clnt_ecdh != NULL)
2107                 EC_KEY_free(clnt_ecdh);
2108         EVP_PKEY_free(srvr_pub_pkey);
2109 #endif
2110         return(-1);
2111         }
2112
2113 int ssl3_send_client_verify(SSL *s)
2114         {
2115         unsigned char *p,*d;
2116         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
2117         EVP_PKEY *pkey;
2118 #ifndef OPENSSL_NO_RSA
2119         unsigned u=0;
2120 #endif
2121         unsigned long n;
2122 #if !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_ECDSA)
2123         int j;
2124 #endif
2125
2126         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
2127                 {
2128                 d=(unsigned char *)s->init_buf->data;
2129                 p= &(d[4]);
2130                 pkey=s->cert->key->privatekey;
2131
2132                 s->method->ssl3_enc->cert_verify_mac(s,&(s->s3->finish_dgst2),
2133                         &(data[MD5_DIGEST_LENGTH]));
2134
2135 #ifndef OPENSSL_NO_RSA
2136                 if (pkey->type == EVP_PKEY_RSA)
2137                         {
2138                         s->method->ssl3_enc->cert_verify_mac(s,
2139                                 &(s->s3->finish_dgst1),&(data[0]));
2140                         if (RSA_sign(NID_md5_sha1, data,
2141                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
2142                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
2143                                 {
2144                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
2145                                 goto err;
2146                                 }
2147                         s2n(u,p);
2148                         n=u+2;
2149                         }
2150                 else
2151 #endif
2152 #ifndef OPENSSL_NO_DSA
2153                         if (pkey->type == EVP_PKEY_DSA)
2154                         {
2155                         if (!DSA_sign(pkey->save_type,
2156                                 &(data[MD5_DIGEST_LENGTH]),
2157                                 SHA_DIGEST_LENGTH,&(p[2]),
2158                                 (unsigned int *)&j,pkey->pkey.dsa))
2159                                 {
2160                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
2161                                 goto err;
2162                                 }
2163                         s2n(j,p);
2164                         n=j+2;
2165                         }
2166                 else
2167 #endif
2168 #ifndef OPENSSL_NO_ECDSA
2169                         if (pkey->type == EVP_PKEY_EC)
2170                         {
2171                         if (!ECDSA_sign(pkey->save_type,
2172                                 &(data[MD5_DIGEST_LENGTH]),
2173                                 SHA_DIGEST_LENGTH,&(p[2]),
2174                                 (unsigned int *)&j,pkey->pkey.ec))
2175                                 {
2176                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
2177                                     ERR_R_ECDSA_LIB);
2178                                 goto err;
2179                                 }
2180                         s2n(j,p);
2181                         n=j+2;
2182                         }
2183                 else
2184 #endif
2185                         {
2186                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
2187                         goto err;
2188                         }
2189                 *(d++)=SSL3_MT_CERTIFICATE_VERIFY;
2190                 l2n3(n,d);
2191
2192                 s->state=SSL3_ST_CW_CERT_VRFY_B;
2193                 s->init_num=(int)n+4;
2194                 s->init_off=0;
2195                 }
2196         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2197 err:
2198         return(-1);
2199         }
2200
2201 int ssl3_send_client_certificate(SSL *s)
2202         {
2203         X509 *x509=NULL;
2204         EVP_PKEY *pkey=NULL;
2205         int i;
2206         unsigned long l;
2207
2208         if (s->state == SSL3_ST_CW_CERT_A)
2209                 {
2210                 if ((s->cert == NULL) ||
2211                         (s->cert->key->x509 == NULL) ||
2212                         (s->cert->key->privatekey == NULL))
2213                         s->state=SSL3_ST_CW_CERT_B;
2214                 else
2215                         s->state=SSL3_ST_CW_CERT_C;
2216                 }
2217
2218         /* We need to get a client cert */
2219         if (s->state == SSL3_ST_CW_CERT_B)
2220                 {
2221                 /* If we get an error, we need to
2222                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
2223                  * We then get retied later */
2224                 i=0;
2225                 if (s->ctx->client_cert_cb != NULL)
2226                         i=s->ctx->client_cert_cb(s,&(x509),&(pkey));
2227                 if (i < 0)
2228                         {
2229                         s->rwstate=SSL_X509_LOOKUP;
2230                         return(-1);
2231                         }
2232                 s->rwstate=SSL_NOTHING;
2233                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
2234                         {
2235                         s->state=SSL3_ST_CW_CERT_B;
2236                         if (    !SSL_use_certificate(s,x509) ||
2237                                 !SSL_use_PrivateKey(s,pkey))
2238                                 i=0;
2239                         }
2240                 else if (i == 1)
2241                         {
2242                         i=0;
2243                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
2244                         }
2245
2246                 if (x509 != NULL) X509_free(x509);
2247                 if (pkey != NULL) EVP_PKEY_free(pkey);
2248                 if (i == 0)
2249                         {
2250                         if (s->version == SSL3_VERSION)
2251                                 {
2252                                 s->s3->tmp.cert_req=0;
2253                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
2254                                 return(1);
2255                                 }
2256                         else
2257                                 {
2258                                 s->s3->tmp.cert_req=2;
2259                                 }
2260                         }
2261
2262                 /* Ok, we have a cert */
2263                 s->state=SSL3_ST_CW_CERT_C;
2264                 }
2265
2266         if (s->state == SSL3_ST_CW_CERT_C)
2267                 {
2268                 s->state=SSL3_ST_CW_CERT_D;
2269                 l=ssl3_output_cert_chain(s,
2270                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
2271                 s->init_num=(int)l;
2272                 s->init_off=0;
2273                 }
2274         /* SSL3_ST_CW_CERT_D */
2275         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2276         }
2277
2278 #define has_bits(i,m)   (((i)&(m)) == (m))
2279
2280 int ssl3_check_cert_and_algorithm(SSL *s)
2281         {
2282         int i,idx;
2283         long algs;
2284         EVP_PKEY *pkey=NULL;
2285         SESS_CERT *sc;
2286 #ifndef OPENSSL_NO_RSA
2287         RSA *rsa;
2288 #endif
2289 #ifndef OPENSSL_NO_DH
2290         DH *dh;
2291 #endif
2292
2293         sc=s->session->sess_cert;
2294
2295         if (sc == NULL)
2296                 {
2297                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,ERR_R_INTERNAL_ERROR);
2298                 goto err;
2299                 }
2300
2301         algs=s->s3->tmp.new_cipher->algorithms;
2302
2303         /* we don't have a certificate */
2304         if (algs & (SSL_aDH|SSL_aNULL|SSL_aKRB5))
2305                 return(1);
2306
2307 #ifndef OPENSSL_NO_RSA
2308         rsa=s->session->sess_cert->peer_rsa_tmp;
2309 #endif
2310 #ifndef OPENSSL_NO_DH
2311         dh=s->session->sess_cert->peer_dh_tmp;
2312 #endif
2313
2314         /* This is the passed certificate */
2315
2316         idx=sc->peer_cert_type;
2317 #ifndef OPENSSL_NO_ECDH
2318         if (idx == SSL_PKEY_ECC)
2319                 {
2320                 if (check_srvr_ecc_cert_and_alg(sc->peer_pkeys[idx].x509,
2321                     s->s3->tmp.new_cipher) == 0)
2322                         { /* check failed */
2323                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_BAD_ECC_CERT);
2324                         goto f_err;
2325                         }
2326                 else
2327                         {
2328                         return 1;
2329                         }
2330                 }
2331 #endif
2332         pkey=X509_get_pubkey(sc->peer_pkeys[idx].x509);
2333         i=X509_certificate_type(sc->peer_pkeys[idx].x509,pkey);
2334         EVP_PKEY_free(pkey);
2335
2336
2337         /* Check that we have a certificate if we require one */
2338         if ((algs & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
2339                 {
2340                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
2341                 goto f_err;
2342                 }
2343 #ifndef OPENSSL_NO_DSA
2344         else if ((algs & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
2345                 {
2346                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
2347                 goto f_err;
2348                 }
2349 #endif
2350 #ifndef OPENSSL_NO_RSA
2351         if ((algs & SSL_kRSA) &&
2352                 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
2353                 {
2354                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
2355                 goto f_err;
2356                 }
2357 #endif
2358 #ifndef OPENSSL_NO_DH
2359         if ((algs & SSL_kEDH) &&
2360                 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
2361                 {
2362                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
2363                 goto f_err;
2364                 }
2365         else if ((algs & SSL_kDHr) && !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
2366                 {
2367                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
2368                 goto f_err;
2369                 }
2370 #ifndef OPENSSL_NO_DSA
2371         else if ((algs & SSL_kDHd) && !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
2372                 {
2373                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
2374                 goto f_err;
2375                 }
2376 #endif
2377 #endif
2378
2379         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i,EVP_PKT_EXP))
2380                 {
2381 #ifndef OPENSSL_NO_RSA
2382                 if (algs & SSL_kRSA)
2383                         {
2384                         if (rsa == NULL
2385                             || RSA_size(rsa)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
2386                                 {
2387                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
2388                                 goto f_err;
2389                                 }
2390                         }
2391                 else
2392 #endif
2393 #ifndef OPENSSL_NO_DH
2394                         if (algs & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2395                             {
2396                             if (dh == NULL
2397                                 || DH_size(dh)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
2398                                 {
2399                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
2400                                 goto f_err;
2401                                 }
2402                         }
2403                 else
2404 #endif
2405                         {
2406                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
2407                         goto f_err;
2408                         }
2409                 }
2410         return(1);
2411 f_err:
2412         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
2413 err:
2414         return(0);
2415         }
2416
2417
2418 #ifndef OPENSSL_NO_ECDH
2419 /* This is the complement of nid2curve_id in s3_srvr.c. */
2420 static int curve_id2nid(int curve_id)
2421 {
2422         /* ECC curves from draft-ietf-tls-ecc-01.txt (Mar 15, 2001)
2423          * (no changes in draft-ietf-tls-ecc-03.txt [June 2003]) */
2424         static int nid_list[26] =
2425         {
2426                 0,
2427                 NID_sect163k1, /* sect163k1 (1) */
2428                 NID_sect163r1, /* sect163r1 (2) */
2429                 NID_sect163r2, /* sect163r2 (3) */
2430                 NID_sect193r1, /* sect193r1 (4) */
2431                 NID_sect193r2, /* sect193r2 (5) */
2432                 NID_sect233k1, /* sect233k1 (6) */
2433                 NID_sect233r1, /* sect233r1 (7) */
2434                 NID_sect239k1, /* sect239k1 (8) */
2435                 NID_sect283k1, /* sect283k1 (9) */
2436                 NID_sect283r1, /* sect283r1 (10) */
2437                 NID_sect409k1, /* sect409k1 (11) */
2438                 NID_sect409r1, /* sect409r1 (12) */
2439                 NID_sect571k1, /* sect571k1 (13) */
2440                 NID_sect571r1, /* sect571r1 (14) */
2441                 NID_secp160k1, /* secp160k1 (15) */
2442                 NID_secp160r1, /* secp160r1 (16) */
2443                 NID_secp160r2, /* secp160r2 (17) */
2444                 NID_secp192k1, /* secp192k1 (18) */
2445                 NID_X9_62_prime192v1, /* secp192r1 (19) */
2446                 NID_secp224k1, /* secp224k1 (20) */
2447                 NID_secp224r1, /* secp224r1 (21) */
2448                 NID_secp256k1, /* secp256k1 (22) */
2449                 NID_X9_62_prime256v1, /* secp256r1 (23) */
2450                 NID_secp384r1, /* secp384r1 (24) */
2451                 NID_secp521r1  /* secp521r1 (25) */
2452         };
2453
2454         if ((curve_id < 1) || (curve_id > 25)) return 0;
2455
2456         return nid_list[curve_id];
2457 }
2458 #endif