ssl/s3_srvr.c

   1 /* ssl/s3_srvr.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58 /* ====================================================================
  59  * Copyright (c) 1998-2002 The OpenSSL Project.  All rights reserved.
  60  *
  61  * Redistribution and use in source and binary forms, with or without
  62  * modification, are permitted provided that the following conditions
  63  * are met:
  64  *
  65  * 1. Redistributions of source code must retain the above copyright
  66  *    notice, this list of conditions and the following disclaimer.
  67  *
  68  * 2. Redistributions in binary form must reproduce the above copyright
  69  *    notice, this list of conditions and the following disclaimer in
  70  *    the documentation and/or other materials provided with the
  71  *    distribution.
  72  *
  73  * 3. All advertising materials mentioning features or use of this
  74  *    software must display the following acknowledgment:
  75  *    "This product includes software developed by the OpenSSL Project
  76  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  77  *
  78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  79  *    endorse or promote products derived from this software without
  80  *    prior written permission. For written permission, please contact
  81  *    openssl-core@openssl.org.
  82  *
  83  * 5. Products derived from this software may not be called "OpenSSL"
  84  *    nor may "OpenSSL" appear in their names without prior written
  85  *    permission of the OpenSSL Project.
  86  *
  87  * 6. Redistributions of any form whatsoever must retain the following
  88  *    acknowledgment:
  89  *    "This product includes software developed by the OpenSSL Project
  90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  91  *
  92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  95  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 103  * OF THE POSSIBILITY OF SUCH DAMAGE.
 104  * ====================================================================
 105  *
 106  * This product includes cryptographic software written by Eric Young
 107  * (eay@cryptsoft.com).  This product includes software written by Tim
 108  * Hudson (tjh@cryptsoft.com).
 109  *
 110  */
 111 /* ====================================================================
 112  * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
 113  *
 114  * Portions of the attached software ("Contribution") are developed by
 115  * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
 116  *
 117  * The Contribution is licensed pursuant to the OpenSSL open source
 118  * license provided above.
 119  *
 120  * ECC cipher suite support in OpenSSL originally written by
 121  * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories.
 122  *
 123  */
 124
 125 #define REUSE_CIPHER_BUG
 126 #define NETSCAPE_HANG_BUG
 127
 128 #include <stdio.h>
 129 #include "ssl_locl.h"
 130 #include "kssl_lcl.h"
 131 #include <openssl/buffer.h>
 132 #include <openssl/rand.h>
 133 #include <openssl/objects.h>
 134 #include <openssl/evp.h>
 135 #include <openssl/x509.h>
 136 #include <openssl/krb5_asn.h>
 137 #include <openssl/md5.h>
 138 #include "cryptlib.h"
 139
 140 static SSL_METHOD *ssl3_get_server_method(int ver);
 141 static int ssl3_get_client_hello(SSL *s);
 142 static int ssl3_check_client_hello(SSL *s);
 143 static int ssl3_send_server_hello(SSL *s);
 144 static int ssl3_send_server_key_exchange(SSL *s);
 145 static int ssl3_send_certificate_request(SSL *s);
 146 static int ssl3_send_server_done(SSL *s);
 147 static int ssl3_get_client_key_exchange(SSL *s);
 148 static int ssl3_get_client_certificate(SSL *s);
 149 static int ssl3_get_cert_verify(SSL *s);
 150 static int ssl3_send_hello_request(SSL *s);
 151
 152 #ifndef OPENSSL_NO_ECDH
 153 static int nid2curve_id(int nid);
 154 #endif
 155
 156 static SSL_METHOD *ssl3_get_server_method(int ver)
 157         {
 158         if (ver == SSL3_VERSION)
 159                 return(SSLv3_server_method());
 160         else
 161                 return(NULL);
 162         }
 163
 164 SSL_METHOD *SSLv3_server_method(void)
 165         {
 166         static int init=1;
 167         static SSL_METHOD SSLv3_server_data;
 168
 169         if (init)
 170                 {
 171                 CRYPTO_w_lock(CRYPTO_LOCK_SSL_METHOD);
 172
 173                 if (init)
 174                         {
 175                         memcpy((char *)&SSLv3_server_data,(char *)sslv3_base_method(),
 176                                 sizeof(SSL_METHOD));
 177                         SSLv3_server_data.ssl_accept=ssl3_accept;
 178                         SSLv3_server_data.get_ssl_method=ssl3_get_server_method;
 179                         init=0;
 180                         }
 181
 182                 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_METHOD);
 183                 }
 184         return(&SSLv3_server_data);
 185         }
 186
 187 int ssl3_accept(SSL *s)
 188         {
 189         BUF_MEM *buf;
 190         unsigned long l,Time=time(NULL);
 191         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 192         long num1;
 193         int ret= -1;
 194         int new_state,state,skip=0;
 195
 196         RAND_add(&Time,sizeof(Time),0);
 197         ERR_clear_error();
 198         clear_sys_error();
 199
 200         if (s->info_callback != NULL)
 201                 cb=s->info_callback;
 202         else if (s->ctx->info_callback != NULL)
 203                 cb=s->ctx->info_callback;
 204
 205         /* init things to blank */
 206         s->in_handshake++;
 207         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 208
 209         if (s->cert == NULL)
 210                 {
 211                 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
 212                 return(-1);
 213                 }
 214
 215         for (;;)
 216                 {
 217                 state=s->state;
 218
 219                 switch (s->state)
 220                         {
 221                 case SSL_ST_RENEGOTIATE:
 222                         s->new_session=1;
 223                         /* s->state=SSL_ST_ACCEPT; */
 224
 225                 case SSL_ST_BEFORE:
 226                 case SSL_ST_ACCEPT:
 227                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 228                 case SSL_ST_OK|SSL_ST_ACCEPT:
 229
 230                         s->server=1;
 231                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 232
 233                         if ((s->version>>8) != 3)
 234                                 {
 235                                 SSLerr(SSL_F_SSL3_ACCEPT, ERR_R_INTERNAL_ERROR);
 236                                 return -1;
 237                                 }
 238                         s->type=SSL_ST_ACCEPT;
 239
 240                         if (s->init_buf == NULL)
 241                                 {
 242                                 if ((buf=BUF_MEM_new()) == NULL)
 243                                         {
 244                                         ret= -1;
 245                                         goto end;
 246                                         }
 247                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 248                                         {
 249                                         ret= -1;
 250                                         goto end;
 251                                         }
 252                                 s->init_buf=buf;
 253                                 }
 254
 255                         if (!ssl3_setup_buffers(s))
 256                                 {
 257                                 ret= -1;
 258                                 goto end;
 259                                 }
 260
 261                         s->init_num=0;
 262
 263                         if (s->state != SSL_ST_RENEGOTIATE)
 264                                 {
 265                                 /* Ok, we now need to push on a buffering BIO so that
 266                                  * the output is sent in a way that TCP likes :-)
 267                                  */
 268                                 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
 269
 270                                 ssl3_init_finished_mac(s);
 271                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
 272                                 s->ctx->stats.sess_accept++;
 273                                 }
 274                         else
 275                                 {
 276                                 /* s->state == SSL_ST_RENEGOTIATE,
 277                                  * we will just send a HelloRequest */
 278                                 s->ctx->stats.sess_accept_renegotiate++;
 279                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
 280                                 }
 281                         break;
 282
 283                 case SSL3_ST_SW_HELLO_REQ_A:
 284                 case SSL3_ST_SW_HELLO_REQ_B:
 285
 286                         s->shutdown=0;
 287                         ret=ssl3_send_hello_request(s);
 288                         if (ret <= 0) goto end;
 289                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
 290                         s->state=SSL3_ST_SW_FLUSH;
 291                         s->init_num=0;
 292
 293                         ssl3_init_finished_mac(s);
 294                         break;
 295
 296                 case SSL3_ST_SW_HELLO_REQ_C:
 297                         s->state=SSL_ST_OK;
 298                         break;
 299
 300                 case SSL3_ST_SR_CLNT_HELLO_A:
 301                 case SSL3_ST_SR_CLNT_HELLO_B:
 302                 case SSL3_ST_SR_CLNT_HELLO_C:
 303
 304                         s->shutdown=0;
 305                         ret=ssl3_get_client_hello(s);
 306                         if (ret <= 0) goto end;
 307                         s->new_session = 2;
 308                         s->state=SSL3_ST_SW_SRVR_HELLO_A;
 309                         s->init_num=0;
 310                         break;
 311
 312                 case SSL3_ST_SW_SRVR_HELLO_A:
 313                 case SSL3_ST_SW_SRVR_HELLO_B:
 314                         ret=ssl3_send_server_hello(s);
 315                         if (ret <= 0) goto end;
 316
 317                         if (s->hit)
 318                                 s->state=SSL3_ST_SW_CHANGE_A;
 319                         else
 320                                 s->state=SSL3_ST_SW_CERT_A;
 321                         s->init_num=0;
 322                         break;
 323
 324                 case SSL3_ST_SW_CERT_A:
 325                 case SSL3_ST_SW_CERT_B:
 326                         /* Check if it is anon DH or anon ECDH */
 327                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 328                                 {
 329                                 ret=ssl3_send_server_certificate(s);
 330                                 if (ret <= 0) goto end;
 331                                 }
 332                         else
 333                                 skip=1;
 334                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 335                         s->init_num=0;
 336                         break;
 337
 338                 case SSL3_ST_SW_KEY_EXCH_A:
 339                 case SSL3_ST_SW_KEY_EXCH_B:
 340                         l=s->s3->tmp.new_cipher->algorithms;
 341
 342                         /* clear this, it may get reset by
 343                          * send_server_key_exchange */
 344                         if ((s->options & SSL_OP_EPHEMERAL_RSA)
 345 #ifndef OPENSSL_NO_KRB5
 346                                 && !(l & SSL_KRB5)
 347 #endif /* OPENSSL_NO_KRB5 */
 348                                 )
 349                                 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
 350                                  * even when forbidden by protocol specs
 351                                  * (handshake may fail as clients are not required to
 352                                  * be able to handle this) */
 353                                 s->s3->tmp.use_rsa_tmp=1;
 354                         else
 355                                 s->s3->tmp.use_rsa_tmp=0;
 356
 357
 358                         /* only send if a DH key exchange, fortezza or
 359                          * RSA but we have a sign only certificate
 360                          *
 361                          * For ECC ciphersuites, we send a serverKeyExchange
 362                          * message only if the cipher suite is either
 363                          * ECDH-anon or ECDHE. In other cases, the
 364                          * server certificate contains the server's
 365                          * public key for key exchange.
 366                          */
 367                         if (s->s3->tmp.use_rsa_tmp
 368                             || (l & SSL_kECDHE)
 369                             || (l & (SSL_DH|SSL_kFZA))
 370                             || ((l & SSL_kRSA)
 371                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
 372                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
 373                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
 374                                         )
 375                                     )
 376                                 )
 377                             )
 378                                 {
 379                                 ret=ssl3_send_server_key_exchange(s);
 380                                 if (ret <= 0) goto end;
 381                                 }
 382                         else
 383                                 skip=1;
 384
 385                         s->state=SSL3_ST_SW_CERT_REQ_A;
 386                         s->init_num=0;
 387                         break;
 388
 389                 case SSL3_ST_SW_CERT_REQ_A:
 390                 case SSL3_ST_SW_CERT_REQ_B:
 391                         if (/* don't request cert unless asked for it: */
 392                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
 393                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
 394                                  * don't request cert during re-negotiation: */
 395                                 ((s->session->peer != NULL) &&
 396                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
 397                                 /* never request cert in anonymous ciphersuites
 398                                  * (see section "Certificate request" in SSL 3 drafts
 399                                  * and in RFC 2246): */
 400                                 ((s->s3->tmp.new_cipher->algorithms & SSL_aNULL) &&
 401                                  /* ... except when the application insists on verification
 402                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
 403                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
 404                                  /* never request cert in Kerberos ciphersuites */
 405                                 (s->s3->tmp.new_cipher->algorithms & SSL_aKRB5))
 406                                 {
 407                                 /* no cert request */
 408                                 skip=1;
 409                                 s->s3->tmp.cert_request=0;
 410                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 411                                 }
 412                         else
 413                                 {
 414                                 s->s3->tmp.cert_request=1;
 415                                 ret=ssl3_send_certificate_request(s);
 416                                 if (ret <= 0) goto end;
 417 #ifndef NETSCAPE_HANG_BUG
 418                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 419 #else
 420                                 s->state=SSL3_ST_SW_FLUSH;
 421                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 422 #endif
 423                                 s->init_num=0;
 424                                 }
 425                         break;
 426
 427                 case SSL3_ST_SW_SRVR_DONE_A:
 428                 case SSL3_ST_SW_SRVR_DONE_B:
 429                         ret=ssl3_send_server_done(s);
 430                         if (ret <= 0) goto end;
 431                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 432                         s->state=SSL3_ST_SW_FLUSH;
 433                         s->init_num=0;
 434                         break;
 435
 436                 case SSL3_ST_SW_FLUSH:
 437                         /* number of bytes to be flushed */
 438                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 439                         if (num1 > 0)
 440                                 {
 441                                 s->rwstate=SSL_WRITING;
 442                                 num1=BIO_flush(s->wbio);
 443                                 if (num1 <= 0) { ret= -1; goto end; }
 444                                 s->rwstate=SSL_NOTHING;
 445                                 }
 446
 447                         s->state=s->s3->tmp.next_state;
 448                         break;
 449
 450                 case SSL3_ST_SR_CERT_A:
 451                 case SSL3_ST_SR_CERT_B:
 452                         /* Check for second client hello (MS SGC) */
 453                         ret = ssl3_check_client_hello(s);
 454                         if (ret <= 0)
 455                                 goto end;
 456                         if (ret == 2)
 457                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
 458                         else {
 459                                 /* could be sent for a DH cert, even if we
 460                                  * have not asked for it :-) */
 461                                 ret=ssl3_get_client_certificate(s);
 462                                 if (ret <= 0) goto end;
 463                                 s->init_num=0;
 464                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
 465                         }
 466                         break;
 467
 468                 case SSL3_ST_SR_KEY_EXCH_A:
 469                 case SSL3_ST_SR_KEY_EXCH_B:
 470                         ret=ssl3_get_client_key_exchange(s);
 471                         if (ret <= 0)
 472                                 goto end;
 473                         if (ret == 2)
 474                                 {
 475                                 /* For the ECDH ciphersuites when
 476                                  * the client sends its ECDH pub key in
 477                                  * a certificate, the CertificateVerify
 478                                  * message is not sent.
 479                                  */
 480                                 s->state=SSL3_ST_SR_FINISHED_A;
 481                                 s->init_num = 0;
 482                                 }
 483                         else
 484                                 {
 485                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
 486                                 s->init_num=0;
 487
 488                                 /* We need to get hashes here so if there is
 489                                  * a client cert, it can be verified
 490                                  */
 491                                 s->method->ssl3_enc->cert_verify_mac(s,
 492                                     &(s->s3->finish_dgst1),
 493                                     &(s->s3->tmp.cert_verify_md[0]));
 494                                 s->method->ssl3_enc->cert_verify_mac(s,
 495                                     &(s->s3->finish_dgst2),
 496                                     &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
 497                                 }
 498                         break;
 499
 500                 case SSL3_ST_SR_CERT_VRFY_A:
 501                 case SSL3_ST_SR_CERT_VRFY_B:
 502
 503                         /* we should decide if we expected this one */
 504                         ret=ssl3_get_cert_verify(s);
 505                         if (ret <= 0) goto end;
 506
 507                         s->state=SSL3_ST_SR_FINISHED_A;
 508                         s->init_num=0;
 509                         break;
 510
 511                 case SSL3_ST_SR_FINISHED_A:
 512                 case SSL3_ST_SR_FINISHED_B:
 513                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
 514                                 SSL3_ST_SR_FINISHED_B);
 515                         if (ret <= 0) goto end;
 516                         if (s->hit)
 517                                 s->state=SSL_ST_OK;
 518                         else
 519                                 s->state=SSL3_ST_SW_CHANGE_A;
 520                         s->init_num=0;
 521                         break;
 522
 523                 case SSL3_ST_SW_CHANGE_A:
 524                 case SSL3_ST_SW_CHANGE_B:
 525
 526                         s->session->cipher=s->s3->tmp.new_cipher;
 527                         if (!s->method->ssl3_enc->setup_key_block(s))
 528                                 { ret= -1; goto end; }
 529
 530                         ret=ssl3_send_change_cipher_spec(s,
 531                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
 532
 533                         if (ret <= 0) goto end;
 534                         s->state=SSL3_ST_SW_FINISHED_A;
 535                         s->init_num=0;
 536
 537                         if (!s->method->ssl3_enc->change_cipher_state(s,
 538                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
 539                                 {
 540                                 ret= -1;
 541                                 goto end;
 542                                 }
 543
 544                         break;
 545
 546                 case SSL3_ST_SW_FINISHED_A:
 547                 case SSL3_ST_SW_FINISHED_B:
 548                         ret=ssl3_send_finished(s,
 549                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
 550                                 s->method->ssl3_enc->server_finished_label,
 551                                 s->method->ssl3_enc->server_finished_label_len);
 552                         if (ret <= 0) goto end;
 553                         s->state=SSL3_ST_SW_FLUSH;
 554                         if (s->hit)
 555                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 556                         else
 557                                 s->s3->tmp.next_state=SSL_ST_OK;
 558                         s->init_num=0;
 559                         break;
 560
 561                 case SSL_ST_OK:
 562                         /* clean a few things up */
 563                         ssl3_cleanup_key_block(s);
 564
 565                         BUF_MEM_free(s->init_buf);
 566                         s->init_buf=NULL;
 567
 568                         /* remove buffering on output */
 569                         ssl_free_wbio_buffer(s);
 570
 571                         s->init_num=0;
 572
 573                         if (s->new_session == 2) /* skipped if we just sent a HelloRequest */
 574                                 {
 575                                 /* actually not necessarily a 'new' session unless
 576                                  * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */
 577
 578                                 s->new_session=0;
 579
 580                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 581
 582                                 s->ctx->stats.sess_accept_good++;
 583                                 /* s->server=1; */
 584                                 s->handshake_func=ssl3_accept;
 585
 586                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 587                                 }
 588
 589                         ret = 1;
 590                         goto end;
 591                         /* break; */
 592
 593                 default:
 594                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
 595                         ret= -1;
 596                         goto end;
 597                         /* break; */
 598                         }
 599
 600                 if (!s->s3->tmp.reuse_message && !skip)
 601                         {
 602                         if (s->debug)
 603                                 {
 604                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 605                                         goto end;
 606                                 }
 607
 608
 609                         if ((cb != NULL) && (s->state != state))
 610                                 {
 611                                 new_state=s->state;
 612                                 s->state=state;
 613                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
 614                                 s->state=new_state;
 615                                 }
 616                         }
 617                 skip=0;
 618                 }
 619 end:
 620         /* BIO_flush(s->wbio); */
 621
 622         s->in_handshake--;
 623         if (cb != NULL)
 624                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 625         return(ret);
 626         }
 627
 628 static int ssl3_send_hello_request(SSL *s)
 629         {
 630         unsigned char *p;
 631
 632         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
 633                 {
 634                 p=(unsigned char *)s->init_buf->data;
 635                 *(p++)=SSL3_MT_HELLO_REQUEST;
 636                 *(p++)=0;
 637                 *(p++)=0;
 638                 *(p++)=0;
 639
 640                 s->state=SSL3_ST_SW_HELLO_REQ_B;
 641                 /* number of bytes to write */
 642                 s->init_num=4;
 643                 s->init_off=0;
 644                 }
 645
 646         /* SSL3_ST_SW_HELLO_REQ_B */
 647         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 648         }
 649
 650 static int ssl3_check_client_hello(SSL *s)
 651         {
 652         int ok;
 653         long n;
 654
 655         /* this function is called when we really expect a Certificate message,
 656          * so permit appropriate message length */
 657         n=ssl3_get_message(s,
 658                 SSL3_ST_SR_CERT_A,
 659                 SSL3_ST_SR_CERT_B,
 660                 -1,
 661                 s->max_cert_list,
 662                 &ok);
 663         if (!ok) return((int)n);
 664         s->s3->tmp.reuse_message = 1;
 665         if (s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO)
 666                 {
 667                 /* Throw away what we have done so far in the current handshake,
 668                  * which will now be aborted. (A full SSL_clear would be too much.)
 669                  * I hope that tmp.dh is the only thing that may need to be cleared
 670                  * when a handshake is not completed ... */
 671 #ifndef OPENSSL_NO_DH
 672                 if (s->s3->tmp.dh != NULL)
 673                         {
 674                         DH_free(s->s3->tmp.dh);
 675                         s->s3->tmp.dh = NULL;
 676                         }
 677 #endif
 678                 return 2;
 679                 }
 680         return 1;
 681 }
 682
 683 static int ssl3_get_client_hello(SSL *s)
 684         {
 685         int i,j,ok,al,ret= -1;
 686         long n;
 687         unsigned long id;
 688         unsigned char *p,*d,*q;
 689         SSL_CIPHER *c;
 690         SSL_COMP *comp=NULL;
 691         STACK_OF(SSL_CIPHER) *ciphers=NULL;
 692
 693         /* We do this so that we will respond with our native type.
 694          * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
 695          * This down switching should be handled by a different method.
 696          * If we are SSLv3, we will respond with SSLv3, even if prompted with
 697          * TLSv1.
 698          */
 699         if (s->state == SSL3_ST_SR_CLNT_HELLO_A)
 700                 {
 701                 s->first_packet=1;
 702                 s->state=SSL3_ST_SR_CLNT_HELLO_B;
 703                 }
 704         n=ssl3_get_message(s,
 705                 SSL3_ST_SR_CLNT_HELLO_B,
 706                 SSL3_ST_SR_CLNT_HELLO_C,
 707                 SSL3_MT_CLIENT_HELLO,
 708                 SSL3_RT_MAX_PLAIN_LENGTH,
 709                 &ok);
 710
 711         if (!ok) return((int)n);
 712         d=p=(unsigned char *)s->init_msg;
 713
 714         /* use version from inside client hello, not from record header
 715          * (may differ: see RFC 2246, Appendix E, second paragraph) */
 716         s->client_version=(((int)p[0])<<8)|(int)p[1];
 717         p+=2;
 718
 719         if (s->client_version < s->version)
 720                 {
 721                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER);
 722                 if ((s->client_version>>8) == SSL3_VERSION_MAJOR)
 723                         {
 724                         /* similar to ssl3_get_record, send alert using remote version number */
 725                         s->version = s->client_version;
 726                         }
 727                 al = SSL_AD_PROTOCOL_VERSION;
 728                 goto f_err;
 729                 }
 730
 731         /* load the client random */
 732         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
 733         p+=SSL3_RANDOM_SIZE;
 734
 735         /* get the session-id */
 736         j= *(p++);
 737
 738         s->hit=0;
 739         /* Versions before 0.9.7 always allow session reuse during renegotiation
 740          * (i.e. when s->new_session is true), option
 741          * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is new with 0.9.7.
 742          * Maybe this optional behaviour should always have been the default,
 743          * but we cannot safely change the default behaviour (or new applications
 744          * might be written that become totally unsecure when compiled with
 745          * an earlier library version)
 746          */
 747         if (j == 0 || (s->new_session && (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION)))
 748                 {
 749                 if (!ssl_get_new_session(s,1))
 750                         goto err;
 751                 }
 752         else
 753                 {
 754                 i=ssl_get_prev_session(s,p,j);
 755                 if (i == 1)
 756                         { /* previous session */
 757                         s->hit=1;
 758                         }
 759                 else if (i == -1)
 760                         goto err;
 761                 else /* i == 0 */
 762                         {
 763                         if (!ssl_get_new_session(s,1))
 764                                 goto err;
 765                         }
 766                 }
 767
 768         p+=j;
 769         n2s(p,i);
 770         if ((i == 0) && (j != 0))
 771                 {
 772                 /* we need a cipher if we are not resuming a session */
 773                 al=SSL_AD_ILLEGAL_PARAMETER;
 774                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
 775                 goto f_err;
 776                 }
 777         if ((p+i) >= (d+n))
 778                 {
 779                 /* not enough data */
 780                 al=SSL_AD_DECODE_ERROR;
 781                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 782                 goto f_err;
 783                 }
 784         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
 785                 == NULL))
 786                 {
 787                 goto err;
 788                 }
 789         p+=i;
 790
 791         /* If it is a hit, check that the cipher is in the list */
 792         if ((s->hit) && (i > 0))
 793                 {
 794                 j=0;
 795                 id=s->session->cipher->id;
 796
 797 #ifdef CIPHER_DEBUG
 798                 printf("client sent %d ciphers\n",sk_num(ciphers));
 799 #endif
 800                 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
 801                         {
 802                         c=sk_SSL_CIPHER_value(ciphers,i);
 803 #ifdef CIPHER_DEBUG
 804                         printf("client [%2d of %2d]:%s\n",
 805                                 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
 806 #endif
 807                         if (c->id == id)
 808                                 {
 809                                 j=1;
 810                                 break;
 811                                 }
 812                         }
 813                 if (j == 0)
 814                         {
 815                         if ((s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
 816                                 {
 817                                 /* Very bad for multi-threading.... */
 818                                 s->session->cipher=sk_SSL_CIPHER_value(ciphers,
 819                                                                        0);
 820                                 }
 821                         else
 822                                 {
 823                                 /* we need to have the cipher in the cipher
 824                                  * list if we are asked to reuse it */
 825                                 al=SSL_AD_ILLEGAL_PARAMETER;
 826                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
 827                                 goto f_err;
 828                                 }
 829                         }
 830                 }
 831
 832         /* compression */
 833         i= *(p++);
 834         if ((p+i) > (d+n))
 835                 {
 836                 /* not enough data */
 837                 al=SSL_AD_DECODE_ERROR;
 838                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 839                 goto f_err;
 840                 }
 841         q=p;
 842         for (j=0; j<i; j++)
 843                 {
 844                 if (p[j] == 0) break;
 845                 }
 846
 847         p+=i;
 848         if (j >= i)
 849                 {
 850                 /* no compress */
 851                 al=SSL_AD_DECODE_ERROR;
 852                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
 853                 goto f_err;
 854                 }
 855
 856         /* Worst case, we will use the NULL compression, but if we have other
 857          * options, we will now look for them.  We have i-1 compression
 858          * algorithms from the client, starting at q. */
 859         s->s3->tmp.new_compression=NULL;
 860         if (s->ctx->comp_methods != NULL)
 861                 { /* See if we have a match */
 862                 int m,nn,o,v,done=0;
 863
 864                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
 865                 for (m=0; m<nn; m++)
 866                         {
 867                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
 868                         v=comp->id;
 869                         for (o=0; o<i; o++)
 870                                 {
 871                                 if (v == q[o])
 872                                         {
 873                                         done=1;
 874                                         break;
 875                                         }
 876                                 }
 877                         if (done) break;
 878                         }
 879                 if (done)
 880                         s->s3->tmp.new_compression=comp;
 881                 else
 882                         comp=NULL;
 883                 }
 884
 885         /* TLS does not mind if there is extra stuff */
 886         if (s->version == SSL3_VERSION)
 887                 {
 888                 if (p < (d+n))
 889                         {
 890                         /* wrong number of bytes,
 891                          * there could be more to follow */
 892                         al=SSL_AD_DECODE_ERROR;
 893                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 894                         goto f_err;
 895                         }
 896                 }
 897
 898         /* Given s->session->ciphers and SSL_get_ciphers, we must
 899          * pick a cipher */
 900
 901         if (!s->hit)
 902                 {
 903                 s->session->compress_meth=(comp == NULL)?0:comp->id;
 904                 if (s->session->ciphers != NULL)
 905                         sk_SSL_CIPHER_free(s->session->ciphers);
 906                 s->session->ciphers=ciphers;
 907                 if (ciphers == NULL)
 908                         {
 909                         al=SSL_AD_ILLEGAL_PARAMETER;
 910                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
 911                         goto f_err;
 912                         }
 913                 ciphers=NULL;
 914                 c=ssl3_choose_cipher(s,s->session->ciphers,
 915                                      SSL_get_ciphers(s));
 916
 917                 if (c == NULL)
 918                         {
 919                         al=SSL_AD_HANDSHAKE_FAILURE;
 920                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
 921                         goto f_err;
 922                         }
 923                 s->s3->tmp.new_cipher=c;
 924                 }
 925         else
 926                 {
 927                 /* Session-id reuse */
 928 #ifdef REUSE_CIPHER_BUG
 929                 STACK_OF(SSL_CIPHER) *sk;
 930                 SSL_CIPHER *nc=NULL;
 931                 SSL_CIPHER *ec=NULL;
 932
 933                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
 934                         {
 935                         sk=s->session->ciphers;
 936                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
 937                                 {
 938                                 c=sk_SSL_CIPHER_value(sk,i);
 939                                 if (c->algorithms & SSL_eNULL)
 940                                         nc=c;
 941                                 if (SSL_C_IS_EXPORT(c))
 942                                         ec=c;
 943                                 }
 944                         if (nc != NULL)
 945                                 s->s3->tmp.new_cipher=nc;
 946                         else if (ec != NULL)
 947                                 s->s3->tmp.new_cipher=ec;
 948                         else
 949                                 s->s3->tmp.new_cipher=s->session->cipher;
 950                         }
 951                 else
 952 #endif
 953                 s->s3->tmp.new_cipher=s->session->cipher;
 954                 }
 955
 956         /* we now have the following setup.
 957          * client_random
 958          * cipher_list          - our prefered list of ciphers
 959          * ciphers              - the clients prefered list of ciphers
 960          * compression          - basically ignored right now
 961          * ssl version is set   - sslv3
 962          * s->session           - The ssl session has been setup.
 963          * s->hit               - session reuse flag
 964          * s->tmp.new_cipher    - the new cipher to use.
 965          */
 966
 967         ret=1;
 968         if (0)
 969                 {
 970 f_err:
 971                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
 972                 }
 973 err:
 974         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
 975         return(ret);
 976         }
 977
 978 static int ssl3_send_server_hello(SSL *s)
 979         {
 980         unsigned char *buf;
 981         unsigned char *p,*d;
 982         int i,sl;
 983         unsigned long l,Time;
 984
 985         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
 986                 {
 987                 buf=(unsigned char *)s->init_buf->data;
 988                 p=s->s3->server_random;
 989                 Time=time(NULL);                        /* Time */
 990                 l2n(Time,p);
 991                 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
 992                 /* Do the message type and length last */
 993                 d=p= &(buf[4]);
 994
 995                 *(p++)=s->version>>8;
 996                 *(p++)=s->version&0xff;
 997
 998                 /* Random stuff */
 999                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
1000                 p+=SSL3_RANDOM_SIZE;
1001
1002                 /* now in theory we have 3 options to sending back the
1003                  * session id.  If it is a re-use, we send back the
1004                  * old session-id, if it is a new session, we send
1005                  * back the new session-id or we send back a 0 length
1006                  * session-id if we want it to be single use.
1007                  * Currently I will not implement the '0' length session-id
1008                  * 12-Jan-98 - I'll now support the '0' length stuff.
1009                  */
1010                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
1011                         s->session->session_id_length=0;
1012
1013                 sl=s->session->session_id_length;
1014                 if (sl > sizeof s->session->session_id)
1015                         {
1016                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1017                         return -1;
1018                         }
1019                 *(p++)=sl;
1020                 memcpy(p,s->session->session_id,sl);
1021                 p+=sl;
1022
1023                 /* put the cipher */
1024                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
1025                 p+=i;
1026
1027                 /* put the compression method */
1028                 if (s->s3->tmp.new_compression == NULL)
1029                         *(p++)=0;
1030                 else
1031                         *(p++)=s->s3->tmp.new_compression->id;
1032
1033                 /* do the header */
1034                 l=(p-d);
1035                 d=buf;
1036                 *(d++)=SSL3_MT_SERVER_HELLO;
1037                 l2n3(l,d);
1038
1039                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
1040                 /* number of bytes to write */
1041                 s->init_num=p-buf;
1042                 s->init_off=0;
1043                 }
1044
1045         /* SSL3_ST_CW_CLNT_HELLO_B */
1046         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1047         }
1048
1049 static int ssl3_send_server_done(SSL *s)
1050         {
1051         unsigned char *p;
1052
1053         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1054                 {
1055                 p=(unsigned char *)s->init_buf->data;
1056
1057                 /* do the header */
1058                 *(p++)=SSL3_MT_SERVER_DONE;
1059                 *(p++)=0;
1060                 *(p++)=0;
1061                 *(p++)=0;
1062
1063                 s->state=SSL3_ST_SW_SRVR_DONE_B;
1064                 /* number of bytes to write */
1065                 s->init_num=4;
1066                 s->init_off=0;
1067                 }
1068
1069         /* SSL3_ST_CW_CLNT_HELLO_B */
1070         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1071         }
1072
1073 static int ssl3_send_server_key_exchange(SSL *s)
1074         {
1075 #ifndef OPENSSL_NO_RSA
1076         unsigned char *q;
1077         int j,num;
1078         RSA *rsa;
1079         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1080         unsigned int u;
1081 #endif
1082 #ifndef OPENSSL_NO_DH
1083         DH *dh=NULL,*dhp;
1084 #endif
1085 #ifndef OPENSSL_NO_ECDH
1086         EC_KEY *ecdh=NULL, *ecdhp;
1087         unsigned char *encodedPoint = NULL;
1088         int encodedlen = 0;
1089         int curve_id = 0;
1090         BN_CTX *bn_ctx = NULL;
1091 #endif
1092         EVP_PKEY *pkey;
1093         unsigned char *p,*d;
1094         int al,i;
1095         unsigned long type;
1096         int n;
1097         CERT *cert;
1098         BIGNUM *r[4];
1099         int nr[4],kn;
1100         BUF_MEM *buf;
1101         EVP_MD_CTX md_ctx;
1102
1103         EVP_MD_CTX_init(&md_ctx);
1104         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1105                 {
1106                 type=s->s3->tmp.new_cipher->algorithms & SSL_MKEY_MASK;
1107                 cert=s->cert;
1108
1109                 buf=s->init_buf;
1110
1111                 r[0]=r[1]=r[2]=r[3]=NULL;
1112                 n=0;
1113 #ifndef OPENSSL_NO_RSA
1114                 if (type & SSL_kRSA)
1115                         {
1116                         rsa=cert->rsa_tmp;
1117                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1118                                 {
1119                                 rsa=s->cert->rsa_tmp_cb(s,
1120                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1121                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1122                                 if(rsa == NULL)
1123                                 {
1124                                         al=SSL_AD_HANDSHAKE_FAILURE;
1125                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1126                                         goto f_err;
1127                                 }
1128                                 RSA_up_ref(rsa);
1129                                 cert->rsa_tmp=rsa;
1130                                 }
1131                         if (rsa == NULL)
1132                                 {
1133                                 al=SSL_AD_HANDSHAKE_FAILURE;
1134                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1135                                 goto f_err;
1136                                 }
1137                         r[0]=rsa->n;
1138                         r[1]=rsa->e;
1139                         s->s3->tmp.use_rsa_tmp=1;
1140                         }
1141                 else
1142 #endif
1143 #ifndef OPENSSL_NO_DH
1144                         if (type & SSL_kEDH)
1145                         {
1146                         dhp=cert->dh_tmp;
1147                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1148                                 dhp=s->cert->dh_tmp_cb(s,
1149                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1150                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1151                         if (dhp == NULL)
1152                                 {
1153                                 al=SSL_AD_HANDSHAKE_FAILURE;
1154                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1155                                 goto f_err;
1156                                 }
1157
1158                         if (s->s3->tmp.dh != NULL)
1159                                 {
1160                                 DH_free(dh);
1161                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1162                                 goto err;
1163                                 }
1164
1165                         if ((dh=DHparams_dup(dhp)) == NULL)
1166                                 {
1167                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1168                                 goto err;
1169                                 }
1170
1171                         s->s3->tmp.dh=dh;
1172                         if ((dhp->pub_key == NULL ||
1173                              dhp->priv_key == NULL ||
1174                              (s->options & SSL_OP_SINGLE_DH_USE)))
1175                                 {
1176                                 if(!DH_generate_key(dh))
1177                                     {
1178                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1179                                            ERR_R_DH_LIB);
1180                                     goto err;
1181                                     }
1182                                 }
1183                         else
1184                                 {
1185                                 dh->pub_key=BN_dup(dhp->pub_key);
1186                                 dh->priv_key=BN_dup(dhp->priv_key);
1187                                 if ((dh->pub_key == NULL) ||
1188                                         (dh->priv_key == NULL))
1189                                         {
1190                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1191                                         goto err;
1192                                         }
1193                                 }
1194                         r[0]=dh->p;
1195                         r[1]=dh->g;
1196                         r[2]=dh->pub_key;
1197                         }
1198                 else
1199 #endif
1200 #ifndef OPENSSL_NO_ECDH
1201                         if (type & SSL_kECDHE)
1202                         {
1203                         ecdhp=cert->ecdh_tmp;
1204                         if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
1205                                 {
1206                                 ecdhp=s->cert->ecdh_tmp_cb(s,
1207                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1208                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1209                                 }
1210                         if (ecdhp == NULL)
1211                                 {
1212                                 al=SSL_AD_HANDSHAKE_FAILURE;
1213                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1214                                 goto f_err;
1215                                 }
1216
1217                         if (s->s3->tmp.ecdh != NULL)
1218                                 {
1219                                 EC_KEY_free(s->s3->tmp.ecdh);
1220                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1221                                 goto err;
1222                                 }
1223
1224                         /* Duplicate the ECDH structure. */
1225                         if (ecdhp == NULL)
1226                                 {
1227                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1228                                 goto err;
1229                                 }
1230                         if (!EC_KEY_up_ref(ecdhp))
1231                                 {
1232                                 SSLerr(SSL_F_SSL3_CTRL,ERR_R_ECDH_LIB);
1233                                 goto err;
1234                                 }
1235                         ecdh = ecdhp;
1236
1237                         s->s3->tmp.ecdh=ecdh;
1238                         if ((ecdh->pub_key == NULL) ||
1239                             (ecdh->priv_key == NULL) ||
1240                             (s->options & SSL_OP_SINGLE_ECDH_USE))
1241                                 {
1242                                 if(!EC_KEY_generate_key(ecdh))
1243                                     {
1244                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1245                                     goto err;
1246                                     }
1247                                 }
1248
1249                         if ((ecdh->group == NULL) ||
1250                             (ecdh->pub_key == NULL) ||
1251                             (ecdh->priv_key == NULL))
1252                                 {
1253                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1254                                 goto err;
1255                                 }
1256
1257                         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1258                             (EC_GROUP_get_degree(ecdh->group) > 163))
1259                                 {
1260                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1261                                 goto err;
1262                                 }
1263
1264                         /* XXX: For now, we only support ephemeral ECDH
1265                          * keys over named (not generic) curves. For
1266                          * supported named curves, curve_id is non-zero.
1267                          */
1268                         if ((curve_id =
1269                             nid2curve_id(EC_GROUP_get_nid(ecdh->group)))
1270                             == 0)
1271                                 {
1272                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1273                                 goto err;
1274                                 }
1275
1276                         /* Encode the public key.
1277                          * First check the size of encoding and
1278                          * allocate memory accordingly.
1279                          */
1280                         encodedlen = EC_POINT_point2oct(ecdh->group,
1281                             ecdh->pub_key,
1282                             POINT_CONVERSION_UNCOMPRESSED,
1283                             NULL, 0, NULL);
1284
1285                         encodedPoint = (unsigned char *)
1286                             OPENSSL_malloc(encodedlen*sizeof(unsigned char));
1287                         bn_ctx = BN_CTX_new();
1288                         if ((encodedPoint == NULL) || (bn_ctx == NULL))
1289                                 {
1290                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1291                                 goto err;
1292                                 }
1293
1294
1295                         encodedlen = EC_POINT_point2oct(ecdh->group,
1296                             ecdh->pub_key,
1297                             POINT_CONVERSION_UNCOMPRESSED,
1298                             encodedPoint, encodedlen, bn_ctx);
1299
1300                         if (encodedlen == 0)
1301                                 {
1302                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1303                                 goto err;
1304                                 }
1305
1306                         BN_CTX_free(bn_ctx);  bn_ctx=NULL;
1307
1308                         /* XXX: For now, we only support named (not
1309                          * generic) curves in ECDH ephemeral key exchanges.
1310                          * In this situation, we need three additional bytes
1311                          * to encode the entire ServerECDHParams
1312                          * structure.
1313                          */
1314                         n = 3 + encodedlen;
1315
1316                         /* We'll generate the serverKeyExchange message
1317                          * explicitly so we can set these to NULLs
1318                          */
1319                         r[0]=NULL;
1320                         r[1]=NULL;
1321                         r[2]=NULL;
1322                         }
1323                 else
1324 #endif /* !OPENSSL_NO_ECDH */
1325                         {
1326                         al=SSL_AD_HANDSHAKE_FAILURE;
1327                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1328                         goto f_err;
1329                         }
1330                 for (i=0; r[i] != NULL; i++)
1331                         {
1332                         nr[i]=BN_num_bytes(r[i]);
1333                         n+=2+nr[i];
1334                         }
1335
1336                 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
1337                         {
1338                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
1339                                 == NULL)
1340                                 {
1341                                 al=SSL_AD_DECODE_ERROR;
1342                                 goto f_err;
1343                                 }
1344                         kn=EVP_PKEY_size(pkey);
1345                         }
1346                 else
1347                         {
1348                         pkey=NULL;
1349                         kn=0;
1350                         }
1351
1352                 if (!BUF_MEM_grow_clean(buf,n+4+kn))
1353                         {
1354                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1355                         goto err;
1356                         }
1357                 d=(unsigned char *)s->init_buf->data;
1358                 p= &(d[4]);
1359
1360                 for (i=0; r[i] != NULL; i++)
1361                         {
1362                         s2n(nr[i],p);
1363                         BN_bn2bin(r[i],p);
1364                         p+=nr[i];
1365                         }
1366
1367 #ifndef OPENSSL_NO_ECDH
1368                 if (type & SSL_kECDHE)
1369                         {
1370                         /* XXX: For now, we only support named (not generic) curves.
1371                          * In this situation, the serverKeyExchange message has:
1372                          * [1 byte CurveType], [1 byte CurveName]
1373                          * [1 byte length of encoded point], followed by
1374                          * the actual encoded point itself
1375                          */
1376                         *p = NAMED_CURVE_TYPE;
1377                         p += 1;
1378                         *p = curve_id;
1379                         p += 1;
1380                         *p = encodedlen;
1381                         p += 1;
1382                         memcpy((unsigned char*)p,
1383                             (unsigned char *)encodedPoint,
1384                             encodedlen);
1385                         OPENSSL_free(encodedPoint);
1386                         p += encodedlen;
1387                         }
1388 #endif
1389
1390                 /* not anonymous */
1391                 if (pkey != NULL)
1392                         {
1393                         /* n is the length of the params, they start at &(d[4])
1394                          * and p points to the space at the end. */
1395 #ifndef OPENSSL_NO_RSA
1396                         if (pkey->type == EVP_PKEY_RSA)
1397                                 {
1398                                 q=md_buf;
1399                                 j=0;
1400                                 for (num=2; num > 0; num--)
1401                                         {
1402                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1403                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1404                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1405                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1406                                         EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1407                                         EVP_DigestFinal_ex(&md_ctx,q,
1408                                                 (unsigned int *)&i);
1409                                         q+=i;
1410                                         j+=i;
1411                                         }
1412                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1413                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1414                                         {
1415                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1416                                         goto err;
1417                                         }
1418                                 s2n(u,p);
1419                                 n+=u+2;
1420                                 }
1421                         else
1422 #endif
1423 #if !defined(OPENSSL_NO_DSA)
1424                                 if (pkey->type == EVP_PKEY_DSA)
1425                                 {
1426                                 /* lets do DSS */
1427                                 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
1428                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1429                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1430                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1431                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1432                                         (unsigned int *)&i,pkey))
1433                                         {
1434                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1435                                         goto err;
1436                                         }
1437                                 s2n(i,p);
1438                                 n+=i+2;
1439                                 }
1440                         else
1441 #endif
1442 #if !defined(OPENSSL_NO_ECDSA)
1443                                 if (pkey->type == EVP_PKEY_EC)
1444                                 {
1445                                 /* let's do ECDSA */
1446                                 EVP_SignInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1447                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1448                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1449                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1450                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1451                                         (unsigned int *)&i,pkey))
1452                                         {
1453                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_ECDSA);
1454                                         goto err;
1455                                         }
1456                                 s2n(i,p);
1457                                 n+=i+2;
1458                                 }
1459                         else
1460 #endif
1461                                 {
1462                                 /* Is this error check actually needed? */
1463                                 al=SSL_AD_HANDSHAKE_FAILURE;
1464                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1465                                 goto f_err;
1466                                 }
1467                         }
1468
1469                 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
1470                 l2n3(n,d);
1471
1472                 /* we should now have things packed up, so lets send
1473                  * it off */
1474                 s->init_num=n+4;
1475                 s->init_off=0;
1476                 }
1477
1478         s->state = SSL3_ST_SW_KEY_EXCH_B;
1479         EVP_MD_CTX_cleanup(&md_ctx);
1480         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1481 f_err:
1482         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1483 err:
1484 #ifndef OPENSSL_NO_ECDH
1485         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1486         BN_CTX_free(bn_ctx);
1487 #endif
1488         EVP_MD_CTX_cleanup(&md_ctx);
1489         return(-1);
1490         }
1491
1492 static int ssl3_send_certificate_request(SSL *s)
1493         {
1494         unsigned char *p,*d;
1495         int i,j,nl,off,n;
1496         STACK_OF(X509_NAME) *sk=NULL;
1497         X509_NAME *name;
1498         BUF_MEM *buf;
1499
1500         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1501                 {
1502                 buf=s->init_buf;
1503
1504                 d=p=(unsigned char *)&(buf->data[4]);
1505
1506                 /* get the list of acceptable cert types */
1507                 p++;
1508                 n=ssl3_get_req_cert_type(s,p);
1509                 d[0]=n;
1510                 p+=n;
1511                 n++;
1512
1513                 off=n;
1514                 p+=2;
1515                 n+=2;
1516
1517                 sk=SSL_get_client_CA_list(s);
1518                 nl=0;
1519                 if (sk != NULL)
1520                         {
1521                         for (i=0; i<sk_X509_NAME_num(sk); i++)
1522                                 {
1523                                 name=sk_X509_NAME_value(sk,i);
1524                                 j=i2d_X509_NAME(name,NULL);
1525                                 if (!BUF_MEM_grow_clean(buf,4+n+j+2))
1526                                         {
1527                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1528                                         goto err;
1529                                         }
1530                                 p=(unsigned char *)&(buf->data[4+n]);
1531                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1532                                         {
1533                                         s2n(j,p);
1534                                         i2d_X509_NAME(name,&p);
1535                                         n+=2+j;
1536                                         nl+=2+j;
1537                                         }
1538                                 else
1539                                         {
1540                                         d=p;
1541                                         i2d_X509_NAME(name,&p);
1542                                         j-=2; s2n(j,d); j+=2;
1543                                         n+=j;
1544                                         nl+=j;
1545                                         }
1546                                 }
1547                         }
1548                 /* else no CA names */
1549                 p=(unsigned char *)&(buf->data[4+off]);
1550                 s2n(nl,p);
1551
1552                 d=(unsigned char *)buf->data;
1553                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1554                 l2n3(n,d);
1555
1556                 /* we should now have things packed up, so lets send
1557                  * it off */
1558
1559                 s->init_num=n+4;
1560                 s->init_off=0;
1561 #ifdef NETSCAPE_HANG_BUG
1562                 p=(unsigned char *)s->init_buf->data + s->init_num;
1563
1564                 /* do the header */
1565                 *(p++)=SSL3_MT_SERVER_DONE;
1566                 *(p++)=0;
1567                 *(p++)=0;
1568                 *(p++)=0;
1569                 s->init_num += 4;
1570 #endif
1571
1572                 }
1573
1574         /* SSL3_ST_SW_CERT_REQ_B */
1575         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1576 err:
1577         return(-1);
1578         }
1579
1580 static int ssl3_get_client_key_exchange(SSL *s)
1581         {
1582         int i,al,ok;
1583         long n;
1584         unsigned long l;
1585         unsigned char *p;
1586 #ifndef OPENSSL_NO_RSA
1587         RSA *rsa=NULL;
1588         EVP_PKEY *pkey=NULL;
1589 #endif
1590 #ifndef OPENSSL_NO_DH
1591         BIGNUM *pub=NULL;
1592         DH *dh_srvr;
1593 #endif
1594 #ifndef OPENSSL_NO_KRB5
1595         KSSL_ERR kssl_err;
1596 #endif /* OPENSSL_NO_KRB5 */
1597
1598 #ifndef OPENSSL_NO_ECDH
1599         EC_KEY *srvr_ecdh = NULL;
1600         EVP_PKEY *clnt_pub_pkey = NULL;
1601         EC_POINT *clnt_ecpoint = NULL;
1602         BN_CTX *bn_ctx = NULL;
1603 #endif
1604
1605         n=ssl3_get_message(s,
1606                 SSL3_ST_SR_KEY_EXCH_A,
1607                 SSL3_ST_SR_KEY_EXCH_B,
1608                 SSL3_MT_CLIENT_KEY_EXCHANGE,
1609                 2048, /* ??? */
1610                 &ok);
1611
1612         if (!ok) return((int)n);
1613         p=(unsigned char *)s->init_msg;
1614
1615         l=s->s3->tmp.new_cipher->algorithms;
1616
1617 #ifndef OPENSSL_NO_RSA
1618         if (l & SSL_kRSA)
1619                 {
1620                 /* FIX THIS UP EAY EAY EAY EAY */
1621                 if (s->s3->tmp.use_rsa_tmp)
1622                         {
1623                         if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
1624                                 rsa=s->cert->rsa_tmp;
1625                         /* Don't do a callback because rsa_tmp should
1626                          * be sent already */
1627                         if (rsa == NULL)
1628                                 {
1629                                 al=SSL_AD_HANDSHAKE_FAILURE;
1630                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
1631                                 goto f_err;
1632
1633                                 }
1634                         }
1635                 else
1636                         {
1637                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
1638                         if (    (pkey == NULL) ||
1639                                 (pkey->type != EVP_PKEY_RSA) ||
1640                                 (pkey->pkey.rsa == NULL))
1641                                 {
1642                                 al=SSL_AD_HANDSHAKE_FAILURE;
1643                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
1644                                 goto f_err;
1645                                 }
1646                         rsa=pkey->pkey.rsa;
1647                         }
1648
1649                 /* TLS */
1650                 if (s->version > SSL3_VERSION)
1651                         {
1652                         n2s(p,i);
1653                         if (n != i+2)
1654                                 {
1655                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
1656                                         {
1657                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
1658                                         goto err;
1659                                         }
1660                                 else
1661                                         p-=2;
1662                                 }
1663                         else
1664                                 n=i;
1665                         }
1666
1667                 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
1668
1669                 al = -1;
1670
1671                 if (i != SSL_MAX_MASTER_KEY_LENGTH)
1672                         {
1673                         al=SSL_AD_DECODE_ERROR;
1674                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1675                         }
1676
1677                 if ((al == -1) && !((p[0] == (s->client_version>>8)) && (p[1] == (s->client_version & 0xff))))
1678                         {
1679                         /* The premaster secret must contain the same version number as the
1680                          * ClientHello to detect version rollback attacks (strangely, the
1681                          * protocol does not offer such protection for DH ciphersuites).
1682                          * However, buggy clients exist that send the negotiated protocol
1683                          * version instead if the server does not support the requested
1684                          * protocol version.
1685                          * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
1686                         if (!((s->options & SSL_OP_TLS_ROLLBACK_BUG) &&
1687                                 (p[0] == (s->version>>8)) && (p[1] == (s->version & 0xff))))
1688                                 {
1689                                 al=SSL_AD_DECODE_ERROR;
1690                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER);
1691                                 goto f_err;
1692                                 }
1693                         }
1694
1695                 if (al != -1)
1696                         {
1697 #if 0
1698                         goto f_err;
1699 #else
1700                         /* Some decryption failure -- use random value instead as countermeasure
1701                          * against Bleichenbacher's attack on PKCS #1 v1.5 RSA padding
1702                          * (see RFC 2246, section 7.4.7.1).
1703                          * But note that due to length and protocol version checking, the
1704                          * attack is impractical anyway (see section 5 in D. Bleichenbacher:
1705                          * "Chosen Ciphertext Attacks Against Protocols Based on the RSA
1706                          * Encryption Standard PKCS #1", CRYPTO '98, LNCS 1462, pp. 1-12).
1707                          */
1708                         ERR_clear_error();
1709                         i = SSL_MAX_MASTER_KEY_LENGTH;
1710                         p[0] = s->client_version >> 8;
1711                         p[1] = s->client_version & 0xff;
1712                         RAND_pseudo_bytes(p+2, i-2); /* should be RAND_bytes, but we cannot work around a failure */
1713 #endif
1714                         }
1715
1716                 s->session->master_key_length=
1717                         s->method->ssl3_enc->generate_master_secret(s,
1718                                 s->session->master_key,
1719                                 p,i);
1720                 OPENSSL_cleanse(p,i);
1721                 }
1722         else
1723 #endif
1724 #ifndef OPENSSL_NO_DH
1725                 if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1726                 {
1727                 n2s(p,i);
1728                 if (n != i+2)
1729                         {
1730                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
1731                                 {
1732                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
1733                                 goto err;
1734                                 }
1735                         else
1736                                 {
1737                                 p-=2;
1738                                 i=(int)n;
1739                                 }
1740                         }
1741
1742                 if (n == 0L) /* the parameters are in the cert */
1743                         {
1744                         al=SSL_AD_HANDSHAKE_FAILURE;
1745                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_DECODE_DH_CERTS);
1746                         goto f_err;
1747                         }
1748                 else
1749                         {
1750                         if (s->s3->tmp.dh == NULL)
1751                                 {
1752                                 al=SSL_AD_HANDSHAKE_FAILURE;
1753                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1754                                 goto f_err;
1755                                 }
1756                         else
1757                                 dh_srvr=s->s3->tmp.dh;
1758                         }
1759
1760                 pub=BN_bin2bn(p,i,NULL);
1761                 if (pub == NULL)
1762                         {
1763                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
1764                         goto err;
1765                         }
1766
1767                 i=DH_compute_key(p,pub,dh_srvr);
1768
1769                 if (i <= 0)
1770                         {
1771                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1772                         goto err;
1773                         }
1774
1775                 DH_free(s->s3->tmp.dh);
1776                 s->s3->tmp.dh=NULL;
1777
1778                 BN_clear_free(pub);
1779                 pub=NULL;
1780                 s->session->master_key_length=
1781                         s->method->ssl3_enc->generate_master_secret(s,
1782                                 s->session->master_key,p,i);
1783                 OPENSSL_cleanse(p,i);
1784                 }
1785         else
1786 #endif
1787 #ifndef OPENSSL_NO_KRB5
1788         if (l & SSL_kKRB5)
1789                 {
1790                 krb5_error_code         krb5rc;
1791                 krb5_data               enc_ticket;
1792                 krb5_data               authenticator;
1793                 krb5_data               enc_pms;
1794                 KSSL_CTX                *kssl_ctx = s->kssl_ctx;
1795                 EVP_CIPHER_CTX          ciph_ctx;
1796                 EVP_CIPHER              *enc = NULL;
1797                 unsigned char           iv[EVP_MAX_IV_LENGTH];
1798                 unsigned char           pms[SSL_MAX_MASTER_KEY_LENGTH
1799                                                + EVP_MAX_BLOCK_LENGTH];
1800                 int                     padl, outl;
1801                 krb5_timestamp          authtime = 0;
1802                 krb5_ticket_times       ttimes;
1803
1804                 EVP_CIPHER_CTX_init(&ciph_ctx);
1805
1806                 if (!kssl_ctx)  kssl_ctx = kssl_ctx_new();
1807
1808                 n2s(p,i);
1809                 enc_ticket.length = i;
1810                 enc_ticket.data = (char *)p;
1811                 p+=enc_ticket.length;
1812
1813                 n2s(p,i);
1814                 authenticator.length = i;
1815                 authenticator.data = (char *)p;
1816                 p+=authenticator.length;
1817
1818                 n2s(p,i);
1819                 enc_pms.length = i;
1820                 enc_pms.data = (char *)p;
1821                 p+=enc_pms.length;
1822
1823                 /* Note that the length is checked again below,
1824                 ** after decryption
1825                 */
1826                 if(enc_pms.length > sizeof pms)
1827                         {
1828                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1829                                SSL_R_DATA_LENGTH_TOO_LONG);
1830                         goto err;
1831                         }
1832
1833                 if (n != enc_ticket.length + authenticator.length +
1834                                                 enc_pms.length + 6)
1835                         {
1836                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1837                                 SSL_R_DATA_LENGTH_TOO_LONG);
1838                         goto err;
1839                         }
1840
1841                 if ((krb5rc = kssl_sget_tkt(kssl_ctx, &enc_ticket, &ttimes,
1842                                         &kssl_err)) != 0)
1843                         {
1844 #ifdef KSSL_DEBUG
1845                         printf("kssl_sget_tkt rtn %d [%d]\n",
1846                                 krb5rc, kssl_err.reason);
1847                         if (kssl_err.text)
1848                                 printf("kssl_err text= %s\n", kssl_err.text);
1849 #endif  /* KSSL_DEBUG */
1850                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1851                                 kssl_err.reason);
1852                         goto err;
1853                         }
1854
1855                 /*  Note: no authenticator is not considered an error,
1856                 **  but will return authtime == 0.
1857                 */
1858                 if ((krb5rc = kssl_check_authent(kssl_ctx, &authenticator,
1859                                         &authtime, &kssl_err)) != 0)
1860                         {
1861 #ifdef KSSL_DEBUG
1862                         printf("kssl_check_authent rtn %d [%d]\n",
1863                                 krb5rc, kssl_err.reason);
1864                         if (kssl_err.text)
1865                                 printf("kssl_err text= %s\n", kssl_err.text);
1866 #endif  /* KSSL_DEBUG */
1867                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1868                                 kssl_err.reason);
1869                         goto err;
1870                         }
1871
1872                 if ((krb5rc = kssl_validate_times(authtime, &ttimes)) != 0)
1873                         {
1874                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, krb5rc);
1875                         goto err;
1876                         }
1877
1878 #ifdef KSSL_DEBUG
1879                 kssl_ctx_show(kssl_ctx);
1880 #endif  /* KSSL_DEBUG */
1881
1882                 enc = kssl_map_enc(kssl_ctx->enctype);
1883                 if (enc == NULL)
1884                     goto err;
1885
1886                 memset(iv, 0, sizeof iv);       /* per RFC 1510 */
1887
1888                 if (!EVP_DecryptInit_ex(&ciph_ctx,enc,NULL,kssl_ctx->key,iv))
1889                         {
1890                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1891                                 SSL_R_DECRYPTION_FAILED);
1892                         goto err;
1893                         }
1894                 if (!EVP_DecryptUpdate(&ciph_ctx, pms,&outl,
1895                                         (unsigned char *)enc_pms.data, enc_pms.length))
1896                         {
1897                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1898                                 SSL_R_DECRYPTION_FAILED);
1899                         goto err;
1900                         }
1901                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
1902                         {
1903                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1904                                 SSL_R_DATA_LENGTH_TOO_LONG);
1905                         goto err;
1906                         }
1907                 if (!EVP_DecryptFinal_ex(&ciph_ctx,&(pms[outl]),&padl))
1908                         {
1909                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1910                                 SSL_R_DECRYPTION_FAILED);
1911                         goto err;
1912                         }
1913                 outl += padl;
1914                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
1915                         {
1916                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1917                                 SSL_R_DATA_LENGTH_TOO_LONG);
1918                         goto err;
1919                         }
1920                 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
1921
1922                 s->session->master_key_length=
1923                         s->method->ssl3_enc->generate_master_secret(s,
1924                                 s->session->master_key, pms, outl);
1925
1926                 if (kssl_ctx->client_princ)
1927                         {
1928                         int len = strlen(kssl_ctx->client_princ);
1929                         if ( len < SSL_MAX_KRB5_PRINCIPAL_LENGTH )
1930                                 {
1931                                 s->session->krb5_client_princ_len = len;
1932                                 memcpy(s->session->krb5_client_princ,kssl_ctx->client_princ,len);
1933                                 }
1934                         }
1935
1936
1937                 /*  Was doing kssl_ctx_free() here,
1938                 **  but it caused problems for apache.
1939                 **  kssl_ctx = kssl_ctx_free(kssl_ctx);
1940                 **  if (s->kssl_ctx)  s->kssl_ctx = NULL;
1941                 */
1942                 }
1943         else
1944 #endif  /* OPENSSL_NO_KRB5 */
1945
1946 #ifndef OPENSSL_NO_ECDH
1947                 if ((l & SSL_kECDH) || (l & SSL_kECDHE))
1948                 {
1949                 int ret = 1;
1950
1951                 /* initialize structures for server's ECDH key pair */
1952                 if ((srvr_ecdh = EC_KEY_new()) == NULL)
1953                         {
1954                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1955                             ERR_R_MALLOC_FAILURE);
1956                         goto err;
1957                         }
1958
1959                 /* Let's get server private key and group information */
1960                 if (l & SSL_kECDH)
1961                         {
1962                         /* use the certificate */
1963                         srvr_ecdh->group = s->cert->key->privatekey-> \
1964                             pkey.eckey->group;
1965                         srvr_ecdh->priv_key = s->cert->key->privatekey-> \
1966                             pkey.eckey->priv_key;
1967                         }
1968                 else
1969                         {
1970                         /* use the ephermeral values we saved when
1971                          * generating the ServerKeyExchange msg.
1972                          */
1973                         srvr_ecdh->group = s->s3->tmp.ecdh->group;
1974                         srvr_ecdh->priv_key = s->s3->tmp.ecdh->priv_key;
1975                         }
1976
1977                 /* Let's get client's public key */
1978                 if ((clnt_ecpoint = EC_POINT_new(srvr_ecdh->group))
1979                     == NULL)
1980                         {
1981                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1982                             ERR_R_MALLOC_FAILURE);
1983                         goto err;
1984                         }
1985
1986                 if (n == 0L)
1987                         {
1988                         /* Client Publickey was in Client Certificate */
1989
1990                          if (l & SSL_kECDHE)
1991                                  {
1992                                  al=SSL_AD_HANDSHAKE_FAILURE;
1993                                  SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1994                                  goto f_err;
1995                                  }
1996                         if (((clnt_pub_pkey=X509_get_pubkey(s->session->peer))
1997                             == NULL) ||
1998                             (clnt_pub_pkey->type != EVP_PKEY_EC))
1999                                 {
2000                                 /* XXX: For now, we do not support client
2001                                  * authentication using ECDH certificates
2002                                  * so this branch (n == 0L) of the code is
2003                                  * never executed. When that support is
2004                                  * added, we ought to ensure the key
2005                                  * received in the certificate is
2006                                  * authorized for key agreement.
2007                                  * ECDH_compute_key implicitly checks that
2008                                  * the two ECDH shares are for the same
2009                                  * group.
2010                                  */
2011                                 al=SSL_AD_HANDSHAKE_FAILURE;
2012                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2013                                     SSL_R_UNABLE_TO_DECODE_ECDH_CERTS);
2014                                 goto f_err;
2015                                 }
2016
2017                         EC_POINT_copy(clnt_ecpoint,
2018                             clnt_pub_pkey->pkey.eckey->pub_key);
2019                         ret = 2; /* Skip certificate verify processing */
2020                         }
2021                 else
2022                         {
2023                         /* Get client's public key from encoded point
2024                          * in the ClientKeyExchange message.
2025                          */
2026                         if ((bn_ctx = BN_CTX_new()) == NULL)
2027                                 {
2028                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2029                                     ERR_R_MALLOC_FAILURE);
2030                                 goto err;
2031                                 }
2032
2033                         /* Get encoded point length */
2034                         i = *p;
2035                         p += 1;
2036                         if (EC_POINT_oct2point(srvr_ecdh->group,
2037                             clnt_ecpoint, p, i, bn_ctx) == 0)
2038                                 {
2039                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2040                                     ERR_R_EC_LIB);
2041                                 goto err;
2042                                 }
2043                         /* p is pointing to somewhere in the buffer
2044                          * currently, so set it to the start
2045                          */
2046                         p=(unsigned char *)s->init_buf->data;
2047                         }
2048
2049                 /* Compute the shared pre-master secret */
2050                 i = ECDH_compute_key(p, clnt_ecpoint, srvr_ecdh);
2051                 if (i <= 0)
2052                         {
2053                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2054                             ERR_R_ECDH_LIB);
2055                         goto err;
2056                         }
2057
2058                 EVP_PKEY_free(clnt_pub_pkey);
2059                 EC_POINT_free(clnt_ecpoint);
2060                 if (srvr_ecdh != NULL)
2061                         {
2062                         srvr_ecdh->priv_key = NULL;
2063                         srvr_ecdh->group = NULL;
2064                         EC_KEY_free(srvr_ecdh);
2065                         }
2066                 BN_CTX_free(bn_ctx);
2067
2068                 /* Compute the master secret */
2069                 s->session->master_key_length = s->method->ssl3_enc-> \
2070                     generate_master_secret(s, s->session->master_key, p, i);
2071
2072                 OPENSSL_cleanse(p, i);
2073                 return (ret);
2074                 }
2075         else
2076 #endif
2077                 {
2078                 al=SSL_AD_HANDSHAKE_FAILURE;
2079                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2080                                 SSL_R_UNKNOWN_CIPHER_TYPE);
2081                 goto f_err;
2082                 }
2083
2084         return(1);
2085 f_err:
2086         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2087 #if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA) || !defined(OPENSSL_NO_ECDH)
2088 err:
2089 #endif
2090 #ifndef OPENSSL_NO_ECDH
2091         EVP_PKEY_free(clnt_pub_pkey);
2092         EC_POINT_free(clnt_ecpoint);
2093         if (srvr_ecdh != NULL)
2094                 {
2095                 srvr_ecdh->priv_key = NULL;
2096                 srvr_ecdh->group = NULL;
2097                 EC_KEY_free(srvr_ecdh);
2098                 }
2099         BN_CTX_free(bn_ctx);
2100 #endif
2101         return(-1);
2102         }
2103
2104 static int ssl3_get_cert_verify(SSL *s)
2105         {
2106         EVP_PKEY *pkey=NULL;
2107         unsigned char *p;
2108         int al,ok,ret=0;
2109         long n;
2110         int type=0,i,j;
2111         X509 *peer;
2112
2113         n=ssl3_get_message(s,
2114                 SSL3_ST_SR_CERT_VRFY_A,
2115                 SSL3_ST_SR_CERT_VRFY_B,
2116                 -1,
2117                 514, /* 514? */
2118                 &ok);
2119
2120         if (!ok) return((int)n);
2121
2122         if (s->session->peer != NULL)
2123                 {
2124                 peer=s->session->peer;
2125                 pkey=X509_get_pubkey(peer);
2126                 type=X509_certificate_type(peer,pkey);
2127                 }
2128         else
2129                 {
2130                 peer=NULL;
2131                 pkey=NULL;
2132                 }
2133
2134         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
2135                 {
2136                 s->s3->tmp.reuse_message=1;
2137                 if ((peer != NULL) && (type | EVP_PKT_SIGN))
2138                         {
2139                         al=SSL_AD_UNEXPECTED_MESSAGE;
2140                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
2141                         goto f_err;
2142                         }
2143                 ret=1;
2144                 goto end;
2145                 }
2146
2147         if (peer == NULL)
2148                 {
2149                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
2150                 al=SSL_AD_UNEXPECTED_MESSAGE;
2151                 goto f_err;
2152                 }
2153
2154         if (!(type & EVP_PKT_SIGN))
2155                 {
2156                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
2157                 al=SSL_AD_ILLEGAL_PARAMETER;
2158                 goto f_err;
2159                 }
2160
2161         if (s->s3->change_cipher_spec)
2162                 {
2163                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
2164                 al=SSL_AD_UNEXPECTED_MESSAGE;
2165                 goto f_err;
2166                 }
2167
2168         /* we now have a signature that we need to verify */
2169         p=(unsigned char *)s->init_msg;
2170         n2s(p,i);
2171         n-=2;
2172         if (i > n)
2173                 {
2174                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
2175                 al=SSL_AD_DECODE_ERROR;
2176                 goto f_err;
2177                 }
2178
2179         j=EVP_PKEY_size(pkey);
2180         if ((i > j) || (n > j) || (n <= 0))
2181                 {
2182                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
2183                 al=SSL_AD_DECODE_ERROR;
2184                 goto f_err;
2185                 }
2186
2187 #ifndef OPENSSL_NO_RSA
2188         if (pkey->type == EVP_PKEY_RSA)
2189                 {
2190                 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
2191                         MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i,
2192                                                         pkey->pkey.rsa);
2193                 if (i < 0)
2194                         {
2195                         al=SSL_AD_DECRYPT_ERROR;
2196                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
2197                         goto f_err;
2198                         }
2199                 if (i == 0)
2200                         {
2201                         al=SSL_AD_DECRYPT_ERROR;
2202                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
2203                         goto f_err;
2204                         }
2205                 }
2206         else
2207 #endif
2208 #ifndef OPENSSL_NO_DSA
2209                 if (pkey->type == EVP_PKEY_DSA)
2210                 {
2211                 j=DSA_verify(pkey->save_type,
2212                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
2213                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
2214                 if (j <= 0)
2215                         {
2216                         /* bad signature */
2217                         al=SSL_AD_DECRYPT_ERROR;
2218                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
2219                         goto f_err;
2220                         }
2221                 }
2222         else
2223 #endif
2224 #ifndef OPENSSL_NO_ECDSA
2225                 if (pkey->type == EVP_PKEY_EC)
2226                 {
2227                 j=ECDSA_verify(pkey->save_type,
2228                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
2229                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.eckey);
2230                 if (j <= 0)
2231                         {
2232                         /* bad signature */
2233                         al=SSL_AD_DECRYPT_ERROR;
2234                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
2235                             SSL_R_BAD_ECDSA_SIGNATURE);
2236                         goto f_err;
2237                         }
2238                 }
2239         else
2240 #endif
2241                 {
2242                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
2243                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
2244                 goto f_err;
2245                 }
2246
2247
2248         ret=1;
2249         if (0)
2250                 {
2251 f_err:
2252                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2253                 }
2254 end:
2255         EVP_PKEY_free(pkey);
2256         return(ret);
2257         }
2258
2259 static int ssl3_get_client_certificate(SSL *s)
2260         {
2261         int i,ok,al,ret= -1;
2262         X509 *x=NULL;
2263         unsigned long l,nc,llen,n;
2264         unsigned char *p,*d,*q;
2265         STACK_OF(X509) *sk=NULL;
2266
2267         n=ssl3_get_message(s,
2268                 SSL3_ST_SR_CERT_A,
2269                 SSL3_ST_SR_CERT_B,
2270                 -1,
2271                 s->max_cert_list,
2272                 &ok);
2273
2274         if (!ok) return((int)n);
2275
2276         if      (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
2277                 {
2278                 if (    (s->verify_mode & SSL_VERIFY_PEER) &&
2279                         (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
2280                         {
2281                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
2282                         al=SSL_AD_HANDSHAKE_FAILURE;
2283                         goto f_err;
2284                         }
2285                 /* If tls asked for a client cert, the client must return a 0 list */
2286                 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
2287                         {
2288                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
2289                         al=SSL_AD_UNEXPECTED_MESSAGE;
2290                         goto f_err;
2291                         }
2292                 s->s3->tmp.reuse_message=1;
2293                 return(1);
2294                 }
2295
2296         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
2297                 {
2298                 al=SSL_AD_UNEXPECTED_MESSAGE;
2299                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
2300                 goto f_err;
2301                 }
2302         d=p=(unsigned char *)s->init_msg;
2303
2304         if ((sk=sk_X509_new_null()) == NULL)
2305                 {
2306                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
2307                 goto err;
2308                 }
2309
2310         n2l3(p,llen);
2311         if (llen+3 != n)
2312                 {
2313                 al=SSL_AD_DECODE_ERROR;
2314                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
2315                 goto f_err;
2316                 }
2317         for (nc=0; nc<llen; )
2318                 {
2319                 n2l3(p,l);
2320                 if ((l+nc+3) > llen)
2321                         {
2322                         al=SSL_AD_DECODE_ERROR;
2323                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
2324                         goto f_err;
2325                         }
2326
2327                 q=p;
2328                 x=d2i_X509(NULL,&p,l);
2329                 if (x == NULL)
2330                         {
2331                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
2332                         goto err;
2333                         }
2334                 if (p != (q+l))
2335                         {
2336                         al=SSL_AD_DECODE_ERROR;
2337                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
2338                         goto f_err;
2339                         }
2340                 if (!sk_X509_push(sk,x))
2341                         {
2342                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
2343                         goto err;
2344                         }
2345                 x=NULL;
2346                 nc+=l+3;
2347                 }
2348
2349         if (sk_X509_num(sk) <= 0)
2350                 {
2351                 /* TLS does not mind 0 certs returned */
2352                 if (s->version == SSL3_VERSION)
2353                         {
2354                         al=SSL_AD_HANDSHAKE_FAILURE;
2355                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
2356                         goto f_err;
2357                         }
2358                 /* Fail for TLS only if we required a certificate */
2359                 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
2360                          (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
2361                         {
2362                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
2363                         al=SSL_AD_HANDSHAKE_FAILURE;
2364                         goto f_err;
2365                         }
2366                 }
2367         else
2368                 {
2369                 i=ssl_verify_cert_chain(s,sk);
2370                 if (!i)
2371                         {
2372                         al=ssl_verify_alarm_type(s->verify_result);
2373                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED);
2374                         goto f_err;
2375                         }
2376                 }
2377
2378         if (s->session->peer != NULL) /* This should not be needed */
2379                 X509_free(s->session->peer);
2380         s->session->peer=sk_X509_shift(sk);
2381         s->session->verify_result = s->verify_result;
2382
2383         /* With the current implementation, sess_cert will always be NULL
2384          * when we arrive here. */
2385         if (s->session->sess_cert == NULL)
2386                 {
2387                 s->session->sess_cert = ssl_sess_cert_new();
2388                 if (s->session->sess_cert == NULL)
2389                         {
2390                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
2391                         goto err;
2392                         }
2393                 }
2394         if (s->session->sess_cert->cert_chain != NULL)
2395                 sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free);
2396         s->session->sess_cert->cert_chain=sk;
2397         /* Inconsistency alert: cert_chain does *not* include the
2398          * peer's own certificate, while we do include it in s3_clnt.c */
2399
2400         sk=NULL;
2401
2402         ret=1;
2403         if (0)
2404                 {
2405 f_err:
2406                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2407                 }
2408 err:
2409         if (x != NULL) X509_free(x);
2410         if (sk != NULL) sk_X509_pop_free(sk,X509_free);
2411         return(ret);
2412         }
2413
2414 int ssl3_send_server_certificate(SSL *s)
2415         {
2416         unsigned long l;
2417         X509 *x;
2418
2419         if (s->state == SSL3_ST_SW_CERT_A)
2420                 {
2421                 x=ssl_get_server_send_cert(s);
2422                 if (x == NULL &&
2423                         /* VRS: allow null cert if auth == KRB5 */
2424                         (s->s3->tmp.new_cipher->algorithms
2425                                 & (SSL_MKEY_MASK|SSL_AUTH_MASK))
2426                         != (SSL_aKRB5|SSL_kKRB5))
2427                         {
2428                         SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
2429                         return(0);
2430                         }
2431
2432                 l=ssl3_output_cert_chain(s,x);
2433                 s->state=SSL3_ST_SW_CERT_B;
2434                 s->init_num=(int)l;
2435                 s->init_off=0;
2436                 }
2437
2438         /* SSL3_ST_SW_CERT_B */
2439         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2440         }
2441
2442
2443 #ifndef OPENSSL_NO_ECDH
2444 /* This is the complement of curve_id2nid in s3_clnt.c. */
2445 static int nid2curve_id(int nid)
2446 {
2447         /* ECC curves from draft-ietf-tls-ecc-01.txt (Mar 15, 2001) */
2448         switch (nid) {
2449         case NID_sect163k1: /* sect163k1 (1) */
2450                 return 1;
2451         case NID_sect163r1: /* sect163r1 (2) */
2452                 return 2;
2453         case NID_sect163r2: /* sect163r2 (3) */
2454                 return 3;
2455         case NID_sect193r1: /* sect193r1 (4) */
2456                 return 4;
2457         case NID_sect193r2: /* sect193r2 (5) */
2458                 return 5;
2459         case NID_sect233k1: /* sect233k1 (6) */
2460                 return 6;
2461         case NID_sect233r1: /* sect233r1 (7) */
2462                 return 7;
2463         case NID_sect239k1: /* sect239k1 (8) */
2464                 return 8;
2465         case NID_sect283k1: /* sect283k1 (9) */
2466                 return 9;
2467         case NID_sect283r1: /* sect283r1 (10) */
2468                 return 10;
2469         case NID_sect409k1: /* sect409k1 (11) */
2470                 return 11;
2471         case NID_sect409r1: /* sect409r1 (12) */
2472                 return 12;
2473         case NID_sect571k1: /* sect571k1 (13) */
2474                 return 13;
2475         case NID_sect571r1: /* sect571r1 (14) */
2476                 return 14;
2477         case NID_secp160k1: /* secp160k1 (15) */
2478                 return 15;
2479         case NID_secp160r1: /* secp160r1 (16) */
2480                 return 16;
2481         case NID_secp160r2: /* secp160r2 (17) */
2482                 return 17;
2483         case NID_secp192k1: /* secp192k1 (18) */
2484                 return 18;
2485         case NID_X9_62_prime192v1: /* secp192r1 (19) */
2486                 return 19;
2487         case NID_secp224k1: /* secp224k1 (20) */
2488                 return 20;
2489         case NID_secp224r1: /* secp224r1 (21) */
2490                 return 21;
2491         case NID_secp256k1: /* secp256k1 (22) */
2492                 return 22;
2493         case NID_X9_62_prime256v1: /* secp256r1 (23) */
2494                 return 23;
2495         case NID_secp384r1: /* secp384r1 (24) */
2496                 return 24;
2497         case NID_secp521r1:  /* secp521r1 (25) */
2498                 return 25;
2499         default:
2500                 return 0;
2501         }
2502 }
2503 #endif