crypto/openssl-0.9.7d/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 #define REUSE_CIPHER_BUG
 113 #define NETSCAPE_HANG_BUG
 114
 115
 116 #include <stdio.h>
 117 #include "ssl_locl.h"
 118 #include "kssl_lcl.h"
 119 #include <openssl/buffer.h>
 120 #include <openssl/rand.h>
 121 #include <openssl/objects.h>
 122 #include <openssl/evp.h>
 123 #include <openssl/x509.h>
 124 #ifndef OPENSSL_NO_KRB5
 125 #include <openssl/krb5_asn.h>
 126 #endif
 127 #include <openssl/md5.h>
 128
 129 static SSL_METHOD *ssl3_get_server_method(int ver);
 130 static int ssl3_get_client_hello(SSL *s);
 131 static int ssl3_check_client_hello(SSL *s);
 132 static int ssl3_send_server_hello(SSL *s);
 133 static int ssl3_send_server_key_exchange(SSL *s);
 134 static int ssl3_send_certificate_request(SSL *s);
 135 static int ssl3_send_server_done(SSL *s);
 136 static int ssl3_get_client_key_exchange(SSL *s);
 137 static int ssl3_get_client_certificate(SSL *s);
 138 static int ssl3_get_cert_verify(SSL *s);
 139 static int ssl3_send_hello_request(SSL *s);
 140
 141 static SSL_METHOD *ssl3_get_server_method(int ver)
 142         {
 143         if (ver == SSL3_VERSION)
 144                 return(SSLv3_server_method());
 145         else
 146                 return(NULL);
 147         }
 148
 149 SSL_METHOD *SSLv3_server_method(void)
 150         {
 151         static int init=1;
 152         static SSL_METHOD SSLv3_server_data;
 153
 154         if (init)
 155                 {
 156                 CRYPTO_w_lock(CRYPTO_LOCK_SSL_METHOD);
 157
 158                 if (init)
 159                         {
 160                         memcpy((char *)&SSLv3_server_data,(char *)sslv3_base_method(),
 161                                 sizeof(SSL_METHOD));
 162                         SSLv3_server_data.ssl_accept=ssl3_accept;
 163                         SSLv3_server_data.get_ssl_method=ssl3_get_server_method;
 164                         init=0;
 165                         }
 166
 167                 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_METHOD);
 168                 }
 169         return(&SSLv3_server_data);
 170         }
 171
 172 int ssl3_accept(SSL *s)
 173         {
 174         BUF_MEM *buf;
 175         unsigned long l,Time=time(NULL);
 176         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 177         long num1;
 178         int ret= -1;
 179         int new_state,state,skip=0;
 180
 181         RAND_add(&Time,sizeof(Time),0);
 182         ERR_clear_error();
 183         clear_sys_error();
 184
 185         if (s->info_callback != NULL)
 186                 cb=s->info_callback;
 187         else if (s->ctx->info_callback != NULL)
 188                 cb=s->ctx->info_callback;
 189
 190         /* init things to blank */
 191         s->in_handshake++;
 192         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 193
 194         if (s->cert == NULL)
 195                 {
 196                 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
 197                 return(-1);
 198                 }
 199
 200         for (;;)
 201                 {
 202                 state=s->state;
 203
 204                 switch (s->state)
 205                         {
 206                 case SSL_ST_RENEGOTIATE:
 207                         s->new_session=1;
 208                         /* s->state=SSL_ST_ACCEPT; */
 209
 210                 case SSL_ST_BEFORE:
 211                 case SSL_ST_ACCEPT:
 212                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 213                 case SSL_ST_OK|SSL_ST_ACCEPT:
 214
 215                         s->server=1;
 216                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 217
 218                         if ((s->version>>8) != 3)
 219                                 {
 220                                 SSLerr(SSL_F_SSL3_ACCEPT, ERR_R_INTERNAL_ERROR);
 221                                 return -1;
 222                                 }
 223                         s->type=SSL_ST_ACCEPT;
 224
 225                         if (s->init_buf == NULL)
 226                                 {
 227                                 if ((buf=BUF_MEM_new()) == NULL)
 228                                         {
 229                                         ret= -1;
 230                                         goto end;
 231                                         }
 232                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 233                                         {
 234                                         ret= -1;
 235                                         goto end;
 236                                         }
 237                                 s->init_buf=buf;
 238                                 }
 239
 240                         if (!ssl3_setup_buffers(s))
 241                                 {
 242                                 ret= -1;
 243                                 goto end;
 244                                 }
 245
 246                         s->init_num=0;
 247
 248                         if (s->state != SSL_ST_RENEGOTIATE)
 249                                 {
 250                                 /* Ok, we now need to push on a buffering BIO so that
 251                                  * the output is sent in a way that TCP likes :-)
 252                                  */
 253                                 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
 254
 255                                 ssl3_init_finished_mac(s);
 256                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
 257                                 s->ctx->stats.sess_accept++;
 258                                 }
 259                         else
 260                                 {
 261                                 /* s->state == SSL_ST_RENEGOTIATE,
 262                                  * we will just send a HelloRequest */
 263                                 s->ctx->stats.sess_accept_renegotiate++;
 264                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
 265                                 }
 266                         break;
 267
 268                 case SSL3_ST_SW_HELLO_REQ_A:
 269                 case SSL3_ST_SW_HELLO_REQ_B:
 270
 271                         s->shutdown=0;
 272                         ret=ssl3_send_hello_request(s);
 273                         if (ret <= 0) goto end;
 274                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
 275                         s->state=SSL3_ST_SW_FLUSH;
 276                         s->init_num=0;
 277
 278                         ssl3_init_finished_mac(s);
 279                         break;
 280
 281                 case SSL3_ST_SW_HELLO_REQ_C:
 282                         s->state=SSL_ST_OK;
 283                         break;
 284
 285                 case SSL3_ST_SR_CLNT_HELLO_A:
 286                 case SSL3_ST_SR_CLNT_HELLO_B:
 287                 case SSL3_ST_SR_CLNT_HELLO_C:
 288
 289                         s->shutdown=0;
 290                         ret=ssl3_get_client_hello(s);
 291                         if (ret <= 0) goto end;
 292                         s->new_session = 2;
 293                         s->state=SSL3_ST_SW_SRVR_HELLO_A;
 294                         s->init_num=0;
 295                         break;
 296
 297                 case SSL3_ST_SW_SRVR_HELLO_A:
 298                 case SSL3_ST_SW_SRVR_HELLO_B:
 299                         ret=ssl3_send_server_hello(s);
 300                         if (ret <= 0) goto end;
 301
 302                         if (s->hit)
 303                                 s->state=SSL3_ST_SW_CHANGE_A;
 304                         else
 305                                 s->state=SSL3_ST_SW_CERT_A;
 306                         s->init_num=0;
 307                         break;
 308
 309                 case SSL3_ST_SW_CERT_A:
 310                 case SSL3_ST_SW_CERT_B:
 311                         /* Check if it is anon DH */
 312                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 313                                 {
 314                                 ret=ssl3_send_server_certificate(s);
 315                                 if (ret <= 0) goto end;
 316                                 }
 317                         else
 318                                 skip=1;
 319                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 320                         s->init_num=0;
 321                         break;
 322
 323                 case SSL3_ST_SW_KEY_EXCH_A:
 324                 case SSL3_ST_SW_KEY_EXCH_B:
 325                         l=s->s3->tmp.new_cipher->algorithms;
 326
 327                         /* clear this, it may get reset by
 328                          * send_server_key_exchange */
 329                         if ((s->options & SSL_OP_EPHEMERAL_RSA)
 330 #ifndef OPENSSL_NO_KRB5
 331                                 && !(l & SSL_KRB5)
 332 #endif /* OPENSSL_NO_KRB5 */
 333                                 )
 334                                 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
 335                                  * even when forbidden by protocol specs
 336                                  * (handshake may fail as clients are not required to
 337                                  * be able to handle this) */
 338                                 s->s3->tmp.use_rsa_tmp=1;
 339                         else
 340                                 s->s3->tmp.use_rsa_tmp=0;
 341
 342                         /* only send if a DH key exchange, fortezza or
 343                          * RSA but we have a sign only certificate */
 344                         if (s->s3->tmp.use_rsa_tmp
 345                             || (l & (SSL_DH|SSL_kFZA))
 346                             || ((l & SSL_kRSA)
 347                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
 348                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
 349                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
 350                                         )
 351                                     )
 352                                 )
 353                             )
 354                                 {
 355                                 ret=ssl3_send_server_key_exchange(s);
 356                                 if (ret <= 0) goto end;
 357                                 }
 358                         else
 359                                 skip=1;
 360
 361                         s->state=SSL3_ST_SW_CERT_REQ_A;
 362                         s->init_num=0;
 363                         break;
 364
 365                 case SSL3_ST_SW_CERT_REQ_A:
 366                 case SSL3_ST_SW_CERT_REQ_B:
 367                         if (/* don't request cert unless asked for it: */
 368                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
 369                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
 370                                  * don't request cert during re-negotiation: */
 371                                 ((s->session->peer != NULL) &&
 372                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
 373                                 /* never request cert in anonymous ciphersuites
 374                                  * (see section "Certificate request" in SSL 3 drafts
 375                                  * and in RFC 2246): */
 376                                 ((s->s3->tmp.new_cipher->algorithms & SSL_aNULL) &&
 377                                  /* ... except when the application insists on verification
 378                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
 379                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
 380                                  /* never request cert in Kerberos ciphersuites */
 381                                 (s->s3->tmp.new_cipher->algorithms & SSL_aKRB5))
 382                                 {
 383                                 /* no cert request */
 384                                 skip=1;
 385                                 s->s3->tmp.cert_request=0;
 386                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 387                                 }
 388                         else
 389                                 {
 390                                 s->s3->tmp.cert_request=1;
 391                                 ret=ssl3_send_certificate_request(s);
 392                                 if (ret <= 0) goto end;
 393 #ifndef NETSCAPE_HANG_BUG
 394                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 395 #else
 396                                 s->state=SSL3_ST_SW_FLUSH;
 397                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 398 #endif
 399                                 s->init_num=0;
 400                                 }
 401                         break;
 402
 403                 case SSL3_ST_SW_SRVR_DONE_A:
 404                 case SSL3_ST_SW_SRVR_DONE_B:
 405                         ret=ssl3_send_server_done(s);
 406                         if (ret <= 0) goto end;
 407                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 408                         s->state=SSL3_ST_SW_FLUSH;
 409                         s->init_num=0;
 410                         break;
 411
 412                 case SSL3_ST_SW_FLUSH:
 413                         /* number of bytes to be flushed */
 414                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 415                         if (num1 > 0)
 416                                 {
 417                                 s->rwstate=SSL_WRITING;
 418                                 num1=BIO_flush(s->wbio);
 419                                 if (num1 <= 0) { ret= -1; goto end; }
 420                                 s->rwstate=SSL_NOTHING;
 421                                 }
 422
 423                         s->state=s->s3->tmp.next_state;
 424                         break;
 425
 426                 case SSL3_ST_SR_CERT_A:
 427                 case SSL3_ST_SR_CERT_B:
 428                         /* Check for second client hello (MS SGC) */
 429                         ret = ssl3_check_client_hello(s);
 430                         if (ret <= 0)
 431                                 goto end;
 432                         if (ret == 2)
 433                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
 434                         else {
 435                                 if (s->s3->tmp.cert_request)
 436                                         {
 437                                         ret=ssl3_get_client_certificate(s);
 438                                         if (ret <= 0) goto end;
 439                                         }
 440                                 s->init_num=0;
 441                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
 442                         }
 443                         break;
 444
 445                 case SSL3_ST_SR_KEY_EXCH_A:
 446                 case SSL3_ST_SR_KEY_EXCH_B:
 447                         ret=ssl3_get_client_key_exchange(s);
 448                         if (ret <= 0) goto end;
 449                         s->state=SSL3_ST_SR_CERT_VRFY_A;
 450                         s->init_num=0;
 451
 452                         /* We need to get hashes here so if there is
 453                          * a client cert, it can be verified */
 454                         s->method->ssl3_enc->cert_verify_mac(s,
 455                                 &(s->s3->finish_dgst1),
 456                                 &(s->s3->tmp.cert_verify_md[0]));
 457                         s->method->ssl3_enc->cert_verify_mac(s,
 458                                 &(s->s3->finish_dgst2),
 459                                 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
 460
 461                         break;
 462
 463                 case SSL3_ST_SR_CERT_VRFY_A:
 464                 case SSL3_ST_SR_CERT_VRFY_B:
 465
 466                         /* we should decide if we expected this one */
 467                         ret=ssl3_get_cert_verify(s);
 468                         if (ret <= 0) goto end;
 469
 470                         s->state=SSL3_ST_SR_FINISHED_A;
 471                         s->init_num=0;
 472                         break;
 473
 474                 case SSL3_ST_SR_FINISHED_A:
 475                 case SSL3_ST_SR_FINISHED_B:
 476                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
 477                                 SSL3_ST_SR_FINISHED_B);
 478                         if (ret <= 0) goto end;
 479                         if (s->hit)
 480                                 s->state=SSL_ST_OK;
 481                         else
 482                                 s->state=SSL3_ST_SW_CHANGE_A;
 483                         s->init_num=0;
 484                         break;
 485
 486                 case SSL3_ST_SW_CHANGE_A:
 487                 case SSL3_ST_SW_CHANGE_B:
 488
 489                         s->session->cipher=s->s3->tmp.new_cipher;
 490                         if (!s->method->ssl3_enc->setup_key_block(s))
 491                                 { ret= -1; goto end; }
 492
 493                         ret=ssl3_send_change_cipher_spec(s,
 494                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
 495
 496                         if (ret <= 0) goto end;
 497                         s->state=SSL3_ST_SW_FINISHED_A;
 498                         s->init_num=0;
 499
 500                         if (!s->method->ssl3_enc->change_cipher_state(s,
 501                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
 502                                 {
 503                                 ret= -1;
 504                                 goto end;
 505                                 }
 506
 507                         break;
 508
 509                 case SSL3_ST_SW_FINISHED_A:
 510                 case SSL3_ST_SW_FINISHED_B:
 511                         ret=ssl3_send_finished(s,
 512                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
 513                                 s->method->ssl3_enc->server_finished_label,
 514                                 s->method->ssl3_enc->server_finished_label_len);
 515                         if (ret <= 0) goto end;
 516                         s->state=SSL3_ST_SW_FLUSH;
 517                         if (s->hit)
 518                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 519                         else
 520                                 s->s3->tmp.next_state=SSL_ST_OK;
 521                         s->init_num=0;
 522                         break;
 523
 524                 case SSL_ST_OK:
 525                         /* clean a few things up */
 526                         ssl3_cleanup_key_block(s);
 527
 528                         BUF_MEM_free(s->init_buf);
 529                         s->init_buf=NULL;
 530
 531                         /* remove buffering on output */
 532                         ssl_free_wbio_buffer(s);
 533
 534                         s->init_num=0;
 535
 536                         if (s->new_session == 2) /* skipped if we just sent a HelloRequest */
 537                                 {
 538                                 /* actually not necessarily a 'new' session unless
 539                                  * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */
 540
 541                                 s->new_session=0;
 542
 543                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 544
 545                                 s->ctx->stats.sess_accept_good++;
 546                                 /* s->server=1; */
 547                                 s->handshake_func=ssl3_accept;
 548
 549                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 550                                 }
 551
 552                         ret = 1;
 553                         goto end;
 554                         /* break; */
 555
 556                 default:
 557                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
 558                         ret= -1;
 559                         goto end;
 560                         /* break; */
 561                         }
 562
 563                 if (!s->s3->tmp.reuse_message && !skip)
 564                         {
 565                         if (s->debug)
 566                                 {
 567                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 568                                         goto end;
 569                                 }
 570
 571
 572                         if ((cb != NULL) && (s->state != state))
 573                                 {
 574                                 new_state=s->state;
 575                                 s->state=state;
 576                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
 577                                 s->state=new_state;
 578                                 }
 579                         }
 580                 skip=0;
 581                 }
 582 end:
 583         /* BIO_flush(s->wbio); */
 584
 585         s->in_handshake--;
 586         if (cb != NULL)
 587                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 588         return(ret);
 589         }
 590
 591 static int ssl3_send_hello_request(SSL *s)
 592         {
 593         unsigned char *p;
 594
 595         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
 596                 {
 597                 p=(unsigned char *)s->init_buf->data;
 598                 *(p++)=SSL3_MT_HELLO_REQUEST;
 599                 *(p++)=0;
 600                 *(p++)=0;
 601                 *(p++)=0;
 602
 603                 s->state=SSL3_ST_SW_HELLO_REQ_B;
 604                 /* number of bytes to write */
 605                 s->init_num=4;
 606                 s->init_off=0;
 607                 }
 608
 609         /* SSL3_ST_SW_HELLO_REQ_B */
 610         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 611         }
 612
 613 static int ssl3_check_client_hello(SSL *s)
 614         {
 615         int ok;
 616         long n;
 617
 618         /* this function is called when we really expect a Certificate message,
 619          * so permit appropriate message length */
 620         n=ssl3_get_message(s,
 621                 SSL3_ST_SR_CERT_A,
 622                 SSL3_ST_SR_CERT_B,
 623                 -1,
 624                 s->max_cert_list,
 625                 &ok);
 626         if (!ok) return((int)n);
 627         s->s3->tmp.reuse_message = 1;
 628         if (s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO)
 629                 {
 630                 /* Throw away what we have done so far in the current handshake,
 631                  * which will now be aborted. (A full SSL_clear would be too much.)
 632                  * I hope that tmp.dh is the only thing that may need to be cleared
 633                  * when a handshake is not completed ... */
 634 #ifndef OPENSSL_NO_DH
 635                 if (s->s3->tmp.dh != NULL)
 636                         {
 637                         DH_free(s->s3->tmp.dh);
 638                         s->s3->tmp.dh = NULL;
 639                         }
 640 #endif
 641                 return 2;
 642                 }
 643         return 1;
 644 }
 645
 646 static int ssl3_get_client_hello(SSL *s)
 647         {
 648         int i,j,ok,al,ret= -1;
 649         long n;
 650         unsigned long id;
 651         unsigned char *p,*d,*q;
 652         SSL_CIPHER *c;
 653         SSL_COMP *comp=NULL;
 654         STACK_OF(SSL_CIPHER) *ciphers=NULL;
 655
 656         /* We do this so that we will respond with our native type.
 657          * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
 658          * This down switching should be handled by a different method.
 659          * If we are SSLv3, we will respond with SSLv3, even if prompted with
 660          * TLSv1.
 661          */
 662         if (s->state == SSL3_ST_SR_CLNT_HELLO_A)
 663                 {
 664                 s->first_packet=1;
 665                 s->state=SSL3_ST_SR_CLNT_HELLO_B;
 666                 }
 667         n=ssl3_get_message(s,
 668                 SSL3_ST_SR_CLNT_HELLO_B,
 669                 SSL3_ST_SR_CLNT_HELLO_C,
 670                 SSL3_MT_CLIENT_HELLO,
 671                 SSL3_RT_MAX_PLAIN_LENGTH,
 672                 &ok);
 673
 674         if (!ok) return((int)n);
 675         d=p=(unsigned char *)s->init_msg;
 676
 677         /* use version from inside client hello, not from record header
 678          * (may differ: see RFC 2246, Appendix E, second paragraph) */
 679         s->client_version=(((int)p[0])<<8)|(int)p[1];
 680         p+=2;
 681
 682         if (s->client_version < s->version)
 683                 {
 684                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER);
 685                 if ((s->client_version>>8) == SSL3_VERSION_MAJOR)
 686                         {
 687                         /* similar to ssl3_get_record, send alert using remote version number */
 688                         s->version = s->client_version;
 689                         }
 690                 al = SSL_AD_PROTOCOL_VERSION;
 691                 goto f_err;
 692                 }
 693
 694         /* load the client random */
 695         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
 696         p+=SSL3_RANDOM_SIZE;
 697
 698         /* get the session-id */
 699         j= *(p++);
 700
 701         s->hit=0;
 702         /* Versions before 0.9.7 always allow session reuse during renegotiation
 703          * (i.e. when s->new_session is true), option
 704          * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is new with 0.9.7.
 705          * Maybe this optional behaviour should always have been the default,
 706          * but we cannot safely change the default behaviour (or new applications
 707          * might be written that become totally unsecure when compiled with
 708          * an earlier library version)
 709          */
 710         if (j == 0 || (s->new_session && (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION)))
 711                 {
 712                 if (!ssl_get_new_session(s,1))
 713                         goto err;
 714                 }
 715         else
 716                 {
 717                 i=ssl_get_prev_session(s,p,j);
 718                 if (i == 1)
 719                         { /* previous session */
 720                         s->hit=1;
 721                         }
 722                 else if (i == -1)
 723                         goto err;
 724                 else /* i == 0 */
 725                         {
 726                         if (!ssl_get_new_session(s,1))
 727                                 goto err;
 728                         }
 729                 }
 730
 731         p+=j;
 732         n2s(p,i);
 733         if ((i == 0) && (j != 0))
 734                 {
 735                 /* we need a cipher if we are not resuming a session */
 736                 al=SSL_AD_ILLEGAL_PARAMETER;
 737                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
 738                 goto f_err;
 739                 }
 740         if ((p+i) >= (d+n))
 741                 {
 742                 /* not enough data */
 743                 al=SSL_AD_DECODE_ERROR;
 744                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 745                 goto f_err;
 746                 }
 747         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
 748                 == NULL))
 749                 {
 750                 goto err;
 751                 }
 752         p+=i;
 753
 754         /* If it is a hit, check that the cipher is in the list */
 755         if ((s->hit) && (i > 0))
 756                 {
 757                 j=0;
 758                 id=s->session->cipher->id;
 759
 760 #ifdef CIPHER_DEBUG
 761                 printf("client sent %d ciphers\n",sk_num(ciphers));
 762 #endif
 763                 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
 764                         {
 765                         c=sk_SSL_CIPHER_value(ciphers,i);
 766 #ifdef CIPHER_DEBUG
 767                         printf("client [%2d of %2d]:%s\n",
 768                                 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
 769 #endif
 770                         if (c->id == id)
 771                                 {
 772                                 j=1;
 773                                 break;
 774                                 }
 775                         }
 776                 if (j == 0)
 777                         {
 778                         if ((s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
 779                                 {
 780                                 /* Very bad for multi-threading.... */
 781                                 s->session->cipher=sk_SSL_CIPHER_value(ciphers,
 782                                                                        0);
 783                                 }
 784                         else
 785                                 {
 786                                 /* we need to have the cipher in the cipher
 787                                  * list if we are asked to reuse it */
 788                                 al=SSL_AD_ILLEGAL_PARAMETER;
 789                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
 790                                 goto f_err;
 791                                 }
 792                         }
 793                 }
 794
 795         /* compression */
 796         i= *(p++);
 797         if ((p+i) > (d+n))
 798                 {
 799                 /* not enough data */
 800                 al=SSL_AD_DECODE_ERROR;
 801                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 802                 goto f_err;
 803                 }
 804         q=p;
 805         for (j=0; j<i; j++)
 806                 {
 807                 if (p[j] == 0) break;
 808                 }
 809
 810         p+=i;
 811         if (j >= i)
 812                 {
 813                 /* no compress */
 814                 al=SSL_AD_DECODE_ERROR;
 815                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
 816                 goto f_err;
 817                 }
 818
 819         /* Worst case, we will use the NULL compression, but if we have other
 820          * options, we will now look for them.  We have i-1 compression
 821          * algorithms from the client, starting at q. */
 822         s->s3->tmp.new_compression=NULL;
 823         if (s->ctx->comp_methods != NULL)
 824                 { /* See if we have a match */
 825                 int m,nn,o,v,done=0;
 826
 827                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
 828                 for (m=0; m<nn; m++)
 829                         {
 830                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
 831                         v=comp->id;
 832                         for (o=0; o<i; o++)
 833                                 {
 834                                 if (v == q[o])
 835                                         {
 836                                         done=1;
 837                                         break;
 838                                         }
 839                                 }
 840                         if (done) break;
 841                         }
 842                 if (done)
 843                         s->s3->tmp.new_compression=comp;
 844                 else
 845                         comp=NULL;
 846                 }
 847
 848         /* TLS does not mind if there is extra stuff */
 849 #if 0   /* SSL 3.0 does not mind either, so we should disable this test
 850          * (was enabled in 0.9.6d through 0.9.6j and 0.9.7 through 0.9.7b,
 851          * in earlier SSLeay/OpenSSL releases this test existed but was buggy) */
 852         if (s->version == SSL3_VERSION)
 853                 {
 854                 if (p < (d+n))
 855                         {
 856                         /* wrong number of bytes,
 857                          * there could be more to follow */
 858                         al=SSL_AD_DECODE_ERROR;
 859                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 860                         goto f_err;
 861                         }
 862                 }
 863 #endif
 864
 865         /* Given s->session->ciphers and SSL_get_ciphers, we must
 866          * pick a cipher */
 867
 868         if (!s->hit)
 869                 {
 870                 s->session->compress_meth=(comp == NULL)?0:comp->id;
 871                 if (s->session->ciphers != NULL)
 872                         sk_SSL_CIPHER_free(s->session->ciphers);
 873                 s->session->ciphers=ciphers;
 874                 if (ciphers == NULL)
 875                         {
 876                         al=SSL_AD_ILLEGAL_PARAMETER;
 877                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
 878                         goto f_err;
 879                         }
 880                 ciphers=NULL;
 881                 c=ssl3_choose_cipher(s,s->session->ciphers,
 882                                      SSL_get_ciphers(s));
 883
 884                 if (c == NULL)
 885                         {
 886                         al=SSL_AD_HANDSHAKE_FAILURE;
 887                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
 888                         goto f_err;
 889                         }
 890                 s->s3->tmp.new_cipher=c;
 891                 }
 892         else
 893                 {
 894                 /* Session-id reuse */
 895 #ifdef REUSE_CIPHER_BUG
 896                 STACK_OF(SSL_CIPHER) *sk;
 897                 SSL_CIPHER *nc=NULL;
 898                 SSL_CIPHER *ec=NULL;
 899
 900                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
 901                         {
 902                         sk=s->session->ciphers;
 903                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
 904                                 {
 905                                 c=sk_SSL_CIPHER_value(sk,i);
 906                                 if (c->algorithms & SSL_eNULL)
 907                                         nc=c;
 908                                 if (SSL_C_IS_EXPORT(c))
 909                                         ec=c;
 910                                 }
 911                         if (nc != NULL)
 912                                 s->s3->tmp.new_cipher=nc;
 913                         else if (ec != NULL)
 914                                 s->s3->tmp.new_cipher=ec;
 915                         else
 916                                 s->s3->tmp.new_cipher=s->session->cipher;
 917                         }
 918                 else
 919 #endif
 920                 s->s3->tmp.new_cipher=s->session->cipher;
 921                 }
 922
 923         /* we now have the following setup.
 924          * client_random
 925          * cipher_list          - our prefered list of ciphers
 926          * ciphers              - the clients prefered list of ciphers
 927          * compression          - basically ignored right now
 928          * ssl version is set   - sslv3
 929          * s->session           - The ssl session has been setup.
 930          * s->hit               - session reuse flag
 931          * s->tmp.new_cipher    - the new cipher to use.
 932          */
 933
 934         ret=1;
 935         if (0)
 936                 {
 937 f_err:
 938                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
 939                 }
 940 err:
 941         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
 942         return(ret);
 943         }
 944
 945 static int ssl3_send_server_hello(SSL *s)
 946         {
 947         unsigned char *buf;
 948         unsigned char *p,*d;
 949         int i,sl;
 950         unsigned long l,Time;
 951
 952         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
 953                 {
 954                 buf=(unsigned char *)s->init_buf->data;
 955                 p=s->s3->server_random;
 956                 Time=time(NULL);                        /* Time */
 957                 l2n(Time,p);
 958                 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
 959                 /* Do the message type and length last */
 960                 d=p= &(buf[4]);
 961
 962                 *(p++)=s->version>>8;
 963                 *(p++)=s->version&0xff;
 964
 965                 /* Random stuff */
 966                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 967                 p+=SSL3_RANDOM_SIZE;
 968
 969                 /* now in theory we have 3 options to sending back the
 970                  * session id.  If it is a re-use, we send back the
 971                  * old session-id, if it is a new session, we send
 972                  * back the new session-id or we send back a 0 length
 973                  * session-id if we want it to be single use.
 974                  * Currently I will not implement the '0' length session-id
 975                  * 12-Jan-98 - I'll now support the '0' length stuff.
 976                  */
 977                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
 978                         s->session->session_id_length=0;
 979
 980                 sl=s->session->session_id_length;
 981                 if (sl > sizeof s->session->session_id)
 982                         {
 983                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
 984                         return -1;
 985                         }
 986                 *(p++)=sl;
 987                 memcpy(p,s->session->session_id,sl);
 988                 p+=sl;
 989
 990                 /* put the cipher */
 991                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
 992                 p+=i;
 993
 994                 /* put the compression method */
 995                 if (s->s3->tmp.new_compression == NULL)
 996                         *(p++)=0;
 997                 else
 998                         *(p++)=s->s3->tmp.new_compression->id;
 999
1000                 /* do the header */
1001                 l=(p-d);
1002                 d=buf;
1003                 *(d++)=SSL3_MT_SERVER_HELLO;
1004                 l2n3(l,d);
1005
1006                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
1007                 /* number of bytes to write */
1008                 s->init_num=p-buf;
1009                 s->init_off=0;
1010                 }
1011
1012         /* SSL3_ST_CW_CLNT_HELLO_B */
1013         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1014         }
1015
1016 static int ssl3_send_server_done(SSL *s)
1017         {
1018         unsigned char *p;
1019
1020         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1021                 {
1022                 p=(unsigned char *)s->init_buf->data;
1023
1024                 /* do the header */
1025                 *(p++)=SSL3_MT_SERVER_DONE;
1026                 *(p++)=0;
1027                 *(p++)=0;
1028                 *(p++)=0;
1029
1030                 s->state=SSL3_ST_SW_SRVR_DONE_B;
1031                 /* number of bytes to write */
1032                 s->init_num=4;
1033                 s->init_off=0;
1034                 }
1035
1036         /* SSL3_ST_CW_CLNT_HELLO_B */
1037         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1038         }
1039
1040 static int ssl3_send_server_key_exchange(SSL *s)
1041         {
1042 #ifndef OPENSSL_NO_RSA
1043         unsigned char *q;
1044         int j,num;
1045         RSA *rsa;
1046         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1047         unsigned int u;
1048 #endif
1049 #ifndef OPENSSL_NO_DH
1050         DH *dh=NULL,*dhp;
1051 #endif
1052         EVP_PKEY *pkey;
1053         unsigned char *p,*d;
1054         int al,i;
1055         unsigned long type;
1056         int n;
1057         CERT *cert;
1058         BIGNUM *r[4];
1059         int nr[4],kn;
1060         BUF_MEM *buf;
1061         EVP_MD_CTX md_ctx;
1062
1063         EVP_MD_CTX_init(&md_ctx);
1064         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1065                 {
1066                 type=s->s3->tmp.new_cipher->algorithms & SSL_MKEY_MASK;
1067                 cert=s->cert;
1068
1069                 buf=s->init_buf;
1070
1071                 r[0]=r[1]=r[2]=r[3]=NULL;
1072                 n=0;
1073 #ifndef OPENSSL_NO_RSA
1074                 if (type & SSL_kRSA)
1075                         {
1076                         rsa=cert->rsa_tmp;
1077                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1078                                 {
1079                                 rsa=s->cert->rsa_tmp_cb(s,
1080                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1081                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1082                                 if(rsa == NULL)
1083                                 {
1084                                         al=SSL_AD_HANDSHAKE_FAILURE;
1085                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1086                                         goto f_err;
1087                                 }
1088                                 RSA_up_ref(rsa);
1089                                 cert->rsa_tmp=rsa;
1090                                 }
1091                         if (rsa == NULL)
1092                                 {
1093                                 al=SSL_AD_HANDSHAKE_FAILURE;
1094                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1095                                 goto f_err;
1096                                 }
1097                         r[0]=rsa->n;
1098                         r[1]=rsa->e;
1099                         s->s3->tmp.use_rsa_tmp=1;
1100                         }
1101                 else
1102 #endif
1103 #ifndef OPENSSL_NO_DH
1104                         if (type & SSL_kEDH)
1105                         {
1106                         dhp=cert->dh_tmp;
1107                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1108                                 dhp=s->cert->dh_tmp_cb(s,
1109                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1110                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1111                         if (dhp == NULL)
1112                                 {
1113                                 al=SSL_AD_HANDSHAKE_FAILURE;
1114                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1115                                 goto f_err;
1116                                 }
1117
1118                         if (s->s3->tmp.dh != NULL)
1119                                 {
1120                                 DH_free(dh);
1121                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1122                                 goto err;
1123                                 }
1124
1125                         if ((dh=DHparams_dup(dhp)) == NULL)
1126                                 {
1127                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1128                                 goto err;
1129                                 }
1130
1131                         s->s3->tmp.dh=dh;
1132                         if ((dhp->pub_key == NULL ||
1133                              dhp->priv_key == NULL ||
1134                              (s->options & SSL_OP_SINGLE_DH_USE)))
1135                                 {
1136                                 if(!DH_generate_key(dh))
1137                                     {
1138                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1139                                            ERR_R_DH_LIB);
1140                                     goto err;
1141                                     }
1142                                 }
1143                         else
1144                                 {
1145                                 dh->pub_key=BN_dup(dhp->pub_key);
1146                                 dh->priv_key=BN_dup(dhp->priv_key);
1147                                 if ((dh->pub_key == NULL) ||
1148                                         (dh->priv_key == NULL))
1149                                         {
1150                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1151                                         goto err;
1152                                         }
1153                                 }
1154                         r[0]=dh->p;
1155                         r[1]=dh->g;
1156                         r[2]=dh->pub_key;
1157                         }
1158                 else
1159 #endif
1160                         {
1161                         al=SSL_AD_HANDSHAKE_FAILURE;
1162                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1163                         goto f_err;
1164                         }
1165                 for (i=0; r[i] != NULL; i++)
1166                         {
1167                         nr[i]=BN_num_bytes(r[i]);
1168                         n+=2+nr[i];
1169                         }
1170
1171                 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
1172                         {
1173                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
1174                                 == NULL)
1175                                 {
1176                                 al=SSL_AD_DECODE_ERROR;
1177                                 goto f_err;
1178                                 }
1179                         kn=EVP_PKEY_size(pkey);
1180                         }
1181                 else
1182                         {
1183                         pkey=NULL;
1184                         kn=0;
1185                         }
1186
1187                 if (!BUF_MEM_grow_clean(buf,n+4+kn))
1188                         {
1189                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1190                         goto err;
1191                         }
1192                 d=(unsigned char *)s->init_buf->data;
1193                 p= &(d[4]);
1194
1195                 for (i=0; r[i] != NULL; i++)
1196                         {
1197                         s2n(nr[i],p);
1198                         BN_bn2bin(r[i],p);
1199                         p+=nr[i];
1200                         }
1201
1202                 /* not anonymous */
1203                 if (pkey != NULL)
1204                         {
1205                         /* n is the length of the params, they start at &(d[4])
1206                          * and p points to the space at the end. */
1207 #ifndef OPENSSL_NO_RSA
1208                         if (pkey->type == EVP_PKEY_RSA)
1209                                 {
1210                                 q=md_buf;
1211                                 j=0;
1212                                 for (num=2; num > 0; num--)
1213                                         {
1214                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1215                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1216                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1217                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1218                                         EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1219                                         EVP_DigestFinal_ex(&md_ctx,q,
1220                                                 (unsigned int *)&i);
1221                                         q+=i;
1222                                         j+=i;
1223                                         }
1224                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1225                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1226                                         {
1227                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1228                                         goto err;
1229                                         }
1230                                 s2n(u,p);
1231                                 n+=u+2;
1232                                 }
1233                         else
1234 #endif
1235 #if !defined(OPENSSL_NO_DSA)
1236                                 if (pkey->type == EVP_PKEY_DSA)
1237                                 {
1238                                 /* lets do DSS */
1239                                 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
1240                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1241                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1242                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1243                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1244                                         (unsigned int *)&i,pkey))
1245                                         {
1246                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1247                                         goto err;
1248                                         }
1249                                 s2n(i,p);
1250                                 n+=i+2;
1251                                 }
1252                         else
1253 #endif
1254                                 {
1255                                 /* Is this error check actually needed? */
1256                                 al=SSL_AD_HANDSHAKE_FAILURE;
1257                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1258                                 goto f_err;
1259                                 }
1260                         }
1261
1262                 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
1263                 l2n3(n,d);
1264
1265                 /* we should now have things packed up, so lets send
1266                  * it off */
1267                 s->init_num=n+4;
1268                 s->init_off=0;
1269                 }
1270
1271         s->state = SSL3_ST_SW_KEY_EXCH_B;
1272         EVP_MD_CTX_cleanup(&md_ctx);
1273         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1274 f_err:
1275         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1276 err:
1277         EVP_MD_CTX_cleanup(&md_ctx);
1278         return(-1);
1279         }
1280
1281 static int ssl3_send_certificate_request(SSL *s)
1282         {
1283         unsigned char *p,*d;
1284         int i,j,nl,off,n;
1285         STACK_OF(X509_NAME) *sk=NULL;
1286         X509_NAME *name;
1287         BUF_MEM *buf;
1288
1289         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1290                 {
1291                 buf=s->init_buf;
1292
1293                 d=p=(unsigned char *)&(buf->data[4]);
1294
1295                 /* get the list of acceptable cert types */
1296                 p++;
1297                 n=ssl3_get_req_cert_type(s,p);
1298                 d[0]=n;
1299                 p+=n;
1300                 n++;
1301
1302                 off=n;
1303                 p+=2;
1304                 n+=2;
1305
1306                 sk=SSL_get_client_CA_list(s);
1307                 nl=0;
1308                 if (sk != NULL)
1309                         {
1310                         for (i=0; i<sk_X509_NAME_num(sk); i++)
1311                                 {
1312                                 name=sk_X509_NAME_value(sk,i);
1313                                 j=i2d_X509_NAME(name,NULL);
1314                                 if (!BUF_MEM_grow_clean(buf,4+n+j+2))
1315                                         {
1316                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1317                                         goto err;
1318                                         }
1319                                 p=(unsigned char *)&(buf->data[4+n]);
1320                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1321                                         {
1322                                         s2n(j,p);
1323                                         i2d_X509_NAME(name,&p);
1324                                         n+=2+j;
1325                                         nl+=2+j;
1326                                         }
1327                                 else
1328                                         {
1329                                         d=p;
1330                                         i2d_X509_NAME(name,&p);
1331                                         j-=2; s2n(j,d); j+=2;
1332                                         n+=j;
1333                                         nl+=j;
1334                                         }
1335                                 }
1336                         }
1337                 /* else no CA names */
1338                 p=(unsigned char *)&(buf->data[4+off]);
1339                 s2n(nl,p);
1340
1341                 d=(unsigned char *)buf->data;
1342                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1343                 l2n3(n,d);
1344
1345                 /* we should now have things packed up, so lets send
1346                  * it off */
1347
1348                 s->init_num=n+4;
1349                 s->init_off=0;
1350 #ifdef NETSCAPE_HANG_BUG
1351                 p=(unsigned char *)s->init_buf->data + s->init_num;
1352
1353                 /* do the header */
1354                 *(p++)=SSL3_MT_SERVER_DONE;
1355                 *(p++)=0;
1356                 *(p++)=0;
1357                 *(p++)=0;
1358                 s->init_num += 4;
1359 #endif
1360
1361                 s->state = SSL3_ST_SW_CERT_REQ_B;
1362                 }
1363
1364         /* SSL3_ST_SW_CERT_REQ_B */
1365         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1366 err:
1367         return(-1);
1368         }
1369
1370 static int ssl3_get_client_key_exchange(SSL *s)
1371         {
1372         int i,al,ok;
1373         long n;
1374         unsigned long l;
1375         unsigned char *p;
1376 #ifndef OPENSSL_NO_RSA
1377         RSA *rsa=NULL;
1378         EVP_PKEY *pkey=NULL;
1379 #endif
1380 #ifndef OPENSSL_NO_DH
1381         BIGNUM *pub=NULL;
1382         DH *dh_srvr;
1383 #endif
1384 #ifndef OPENSSL_NO_KRB5
1385         KSSL_ERR kssl_err;
1386 #endif /* OPENSSL_NO_KRB5 */
1387
1388         n=ssl3_get_message(s,
1389                 SSL3_ST_SR_KEY_EXCH_A,
1390                 SSL3_ST_SR_KEY_EXCH_B,
1391                 SSL3_MT_CLIENT_KEY_EXCHANGE,
1392                 2048, /* ??? */
1393                 &ok);
1394
1395         if (!ok) return((int)n);
1396         p=(unsigned char *)s->init_msg;
1397
1398         l=s->s3->tmp.new_cipher->algorithms;
1399
1400 #ifndef OPENSSL_NO_RSA
1401         if (l & SSL_kRSA)
1402                 {
1403                 /* FIX THIS UP EAY EAY EAY EAY */
1404                 if (s->s3->tmp.use_rsa_tmp)
1405                         {
1406                         if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
1407                                 rsa=s->cert->rsa_tmp;
1408                         /* Don't do a callback because rsa_tmp should
1409                          * be sent already */
1410                         if (rsa == NULL)
1411                                 {
1412                                 al=SSL_AD_HANDSHAKE_FAILURE;
1413                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
1414                                 goto f_err;
1415
1416                                 }
1417                         }
1418                 else
1419                         {
1420                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
1421                         if (    (pkey == NULL) ||
1422                                 (pkey->type != EVP_PKEY_RSA) ||
1423                                 (pkey->pkey.rsa == NULL))
1424                                 {
1425                                 al=SSL_AD_HANDSHAKE_FAILURE;
1426                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
1427                                 goto f_err;
1428                                 }
1429                         rsa=pkey->pkey.rsa;
1430                         }
1431
1432                 /* TLS */
1433                 if (s->version > SSL3_VERSION)
1434                         {
1435                         n2s(p,i);
1436                         if (n != i+2)
1437                                 {
1438                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
1439                                         {
1440                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
1441                                         goto err;
1442                                         }
1443                                 else
1444                                         p-=2;
1445                                 }
1446                         else
1447                                 n=i;
1448                         }
1449
1450                 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
1451
1452                 al = -1;
1453
1454                 if (i != SSL_MAX_MASTER_KEY_LENGTH)
1455                         {
1456                         al=SSL_AD_DECODE_ERROR;
1457                         /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT); */
1458                         }
1459
1460                 if ((al == -1) && !((p[0] == (s->client_version>>8)) && (p[1] == (s->client_version & 0xff))))
1461                         {
1462                         /* The premaster secret must contain the same version number as the
1463                          * ClientHello to detect version rollback attacks (strangely, the
1464                          * protocol does not offer such protection for DH ciphersuites).
1465                          * However, buggy clients exist that send the negotiated protocol
1466                          * version instead if the server does not support the requested
1467                          * protocol version.
1468                          * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
1469                         if (!((s->options & SSL_OP_TLS_ROLLBACK_BUG) &&
1470                                 (p[0] == (s->version>>8)) && (p[1] == (s->version & 0xff))))
1471                                 {
1472                                 al=SSL_AD_DECODE_ERROR;
1473                                 /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER); */
1474
1475                                 /* The Klima-Pokorny-Rosa extension of Bleichenbacher's attack
1476                                  * (http://eprint.iacr.org/2003/052/) exploits the version
1477                                  * number check as a "bad version oracle" -- an alert would
1478                                  * reveal that the plaintext corresponding to some ciphertext
1479                                  * made up by the adversary is properly formatted except
1480                                  * that the version number is wrong.  To avoid such attacks,
1481                                  * we should treat this just like any other decryption error. */
1482                                 }
1483                         }
1484
1485                 if (al != -1)
1486                         {
1487                         /* Some decryption failure -- use random value instead as countermeasure
1488                          * against Bleichenbacher's attack on PKCS #1 v1.5 RSA padding
1489                          * (see RFC 2246, section 7.4.7.1). */
1490                         ERR_clear_error();
1491                         i = SSL_MAX_MASTER_KEY_LENGTH;
1492                         p[0] = s->client_version >> 8;
1493                         p[1] = s->client_version & 0xff;
1494                         RAND_pseudo_bytes(p+2, i-2); /* should be RAND_bytes, but we cannot work around a failure */
1495                         }
1496
1497                 s->session->master_key_length=
1498                         s->method->ssl3_enc->generate_master_secret(s,
1499                                 s->session->master_key,
1500                                 p,i);
1501                 OPENSSL_cleanse(p,i);
1502                 }
1503         else
1504 #endif
1505 #ifndef OPENSSL_NO_DH
1506                 if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1507                 {
1508                 n2s(p,i);
1509                 if (n != i+2)
1510                         {
1511                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
1512                                 {
1513                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
1514                                 goto err;
1515                                 }
1516                         else
1517                                 {
1518                                 p-=2;
1519                                 i=(int)n;
1520                                 }
1521                         }
1522
1523                 if (n == 0L) /* the parameters are in the cert */
1524                         {
1525                         al=SSL_AD_HANDSHAKE_FAILURE;
1526                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_DECODE_DH_CERTS);
1527                         goto f_err;
1528                         }
1529                 else
1530                         {
1531                         if (s->s3->tmp.dh == NULL)
1532                                 {
1533                                 al=SSL_AD_HANDSHAKE_FAILURE;
1534                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1535                                 goto f_err;
1536                                 }
1537                         else
1538                                 dh_srvr=s->s3->tmp.dh;
1539                         }
1540
1541                 pub=BN_bin2bn(p,i,NULL);
1542                 if (pub == NULL)
1543                         {
1544                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
1545                         goto err;
1546                         }
1547
1548                 i=DH_compute_key(p,pub,dh_srvr);
1549
1550                 if (i <= 0)
1551                         {
1552                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1553                         goto err;
1554                         }
1555
1556                 DH_free(s->s3->tmp.dh);
1557                 s->s3->tmp.dh=NULL;
1558
1559                 BN_clear_free(pub);
1560                 pub=NULL;
1561                 s->session->master_key_length=
1562                         s->method->ssl3_enc->generate_master_secret(s,
1563                                 s->session->master_key,p,i);
1564                 OPENSSL_cleanse(p,i);
1565                 }
1566         else
1567 #endif
1568 #ifndef OPENSSL_NO_KRB5
1569         if (l & SSL_kKRB5)
1570                 {
1571                 krb5_error_code         krb5rc;
1572                 krb5_data               enc_ticket;
1573                 krb5_data               authenticator;
1574                 krb5_data               enc_pms;
1575                 KSSL_CTX                *kssl_ctx = s->kssl_ctx;
1576                 EVP_CIPHER_CTX          ciph_ctx;
1577                 EVP_CIPHER              *enc = NULL;
1578                 unsigned char           iv[EVP_MAX_IV_LENGTH];
1579                 unsigned char           pms[SSL_MAX_MASTER_KEY_LENGTH
1580                                                + EVP_MAX_BLOCK_LENGTH];
1581                 int                     padl, outl;
1582                 krb5_timestamp          authtime = 0;
1583                 krb5_ticket_times       ttimes;
1584
1585                 EVP_CIPHER_CTX_init(&ciph_ctx);
1586
1587                 if (!kssl_ctx)  kssl_ctx = kssl_ctx_new();
1588
1589                 n2s(p,i);
1590                 enc_ticket.length = i;
1591
1592                 if (n < enc_ticket.length + 6)
1593                         {
1594                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1595                                 SSL_R_DATA_LENGTH_TOO_LONG);
1596                         goto err;
1597                         }
1598
1599                 enc_ticket.data = (char *)p;
1600                 p+=enc_ticket.length;
1601
1602                 n2s(p,i);
1603                 authenticator.length = i;
1604
1605                 if (n < enc_ticket.length + authenticator.length + 6)
1606                         {
1607                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1608                                 SSL_R_DATA_LENGTH_TOO_LONG);
1609                         goto err;
1610                         }
1611
1612                 authenticator.data = (char *)p;
1613                 p+=authenticator.length;
1614
1615                 n2s(p,i);
1616                 enc_pms.length = i;
1617                 enc_pms.data = (char *)p;
1618                 p+=enc_pms.length;
1619
1620                 /* Note that the length is checked again below,
1621                 ** after decryption
1622                 */
1623                 if(enc_pms.length > sizeof pms)
1624                         {
1625                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1626                                SSL_R_DATA_LENGTH_TOO_LONG);
1627                         goto err;
1628                         }
1629
1630                 if (n != enc_ticket.length + authenticator.length +
1631                                                 enc_pms.length + 6)
1632                         {
1633                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1634                                 SSL_R_DATA_LENGTH_TOO_LONG);
1635                         goto err;
1636                         }
1637
1638                 if ((krb5rc = kssl_sget_tkt(kssl_ctx, &enc_ticket, &ttimes,
1639                                         &kssl_err)) != 0)
1640                         {
1641 #ifdef KSSL_DEBUG
1642                         printf("kssl_sget_tkt rtn %d [%d]\n",
1643                                 krb5rc, kssl_err.reason);
1644                         if (kssl_err.text)
1645                                 printf("kssl_err text= %s\n", kssl_err.text);
1646 #endif  /* KSSL_DEBUG */
1647                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1648                                 kssl_err.reason);
1649                         goto err;
1650                         }
1651
1652                 /*  Note: no authenticator is not considered an error,
1653                 **  but will return authtime == 0.
1654                 */
1655                 if ((krb5rc = kssl_check_authent(kssl_ctx, &authenticator,
1656                                         &authtime, &kssl_err)) != 0)
1657                         {
1658 #ifdef KSSL_DEBUG
1659                         printf("kssl_check_authent rtn %d [%d]\n",
1660                                 krb5rc, kssl_err.reason);
1661                         if (kssl_err.text)
1662                                 printf("kssl_err text= %s\n", kssl_err.text);
1663 #endif  /* KSSL_DEBUG */
1664                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1665                                 kssl_err.reason);
1666                         goto err;
1667                         }
1668
1669                 if ((krb5rc = kssl_validate_times(authtime, &ttimes)) != 0)
1670                         {
1671                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, krb5rc);
1672                         goto err;
1673                         }
1674
1675 #ifdef KSSL_DEBUG
1676                 kssl_ctx_show(kssl_ctx);
1677 #endif  /* KSSL_DEBUG */
1678
1679                 enc = kssl_map_enc(kssl_ctx->enctype);
1680                 if (enc == NULL)
1681                     goto err;
1682
1683                 memset(iv, 0, sizeof iv);       /* per RFC 1510 */
1684
1685                 if (!EVP_DecryptInit_ex(&ciph_ctx,enc,NULL,kssl_ctx->key,iv))
1686                         {
1687                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1688                                 SSL_R_DECRYPTION_FAILED);
1689                         goto err;
1690                         }
1691                 if (!EVP_DecryptUpdate(&ciph_ctx, pms,&outl,
1692                                         (unsigned char *)enc_pms.data, enc_pms.length))
1693                         {
1694                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1695                                 SSL_R_DECRYPTION_FAILED);
1696                         goto err;
1697                         }
1698                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
1699                         {
1700                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1701                                 SSL_R_DATA_LENGTH_TOO_LONG);
1702                         goto err;
1703                         }
1704                 if (!EVP_DecryptFinal_ex(&ciph_ctx,&(pms[outl]),&padl))
1705                         {
1706                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1707                                 SSL_R_DECRYPTION_FAILED);
1708                         goto err;
1709                         }
1710                 outl += padl;
1711                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
1712                         {
1713                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1714                                 SSL_R_DATA_LENGTH_TOO_LONG);
1715                         goto err;
1716                         }
1717                 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
1718
1719                 s->session->master_key_length=
1720                         s->method->ssl3_enc->generate_master_secret(s,
1721                                 s->session->master_key, pms, outl);
1722
1723                 if (kssl_ctx->client_princ)
1724                         {
1725                         int len = strlen(kssl_ctx->client_princ);
1726                         if ( len < SSL_MAX_KRB5_PRINCIPAL_LENGTH )
1727                                 {
1728                                 s->session->krb5_client_princ_len = len;
1729                                 memcpy(s->session->krb5_client_princ,kssl_ctx->client_princ,len);
1730                                 }
1731                         }
1732
1733
1734                 /*  Was doing kssl_ctx_free() here,
1735                 **  but it caused problems for apache.
1736                 **  kssl_ctx = kssl_ctx_free(kssl_ctx);
1737                 **  if (s->kssl_ctx)  s->kssl_ctx = NULL;
1738                 */
1739                 }
1740         else
1741 #endif  /* OPENSSL_NO_KRB5 */
1742                 {
1743                 al=SSL_AD_HANDSHAKE_FAILURE;
1744                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1745                                 SSL_R_UNKNOWN_CIPHER_TYPE);
1746                 goto f_err;
1747                 }
1748
1749         return(1);
1750 f_err:
1751         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1752 #if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA)
1753 err:
1754 #endif
1755         return(-1);
1756         }
1757
1758 static int ssl3_get_cert_verify(SSL *s)
1759         {
1760         EVP_PKEY *pkey=NULL;
1761         unsigned char *p;
1762         int al,ok,ret=0;
1763         long n;
1764         int type=0,i,j;
1765         X509 *peer;
1766
1767         n=ssl3_get_message(s,
1768                 SSL3_ST_SR_CERT_VRFY_A,
1769                 SSL3_ST_SR_CERT_VRFY_B,
1770                 -1,
1771                 514, /* 514? */
1772                 &ok);
1773
1774         if (!ok) return((int)n);
1775
1776         if (s->session->peer != NULL)
1777                 {
1778                 peer=s->session->peer;
1779                 pkey=X509_get_pubkey(peer);
1780                 type=X509_certificate_type(peer,pkey);
1781                 }
1782         else
1783                 {
1784                 peer=NULL;
1785                 pkey=NULL;
1786                 }
1787
1788         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
1789                 {
1790                 s->s3->tmp.reuse_message=1;
1791                 if ((peer != NULL) && (type | EVP_PKT_SIGN))
1792                         {
1793                         al=SSL_AD_UNEXPECTED_MESSAGE;
1794                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
1795                         goto f_err;
1796                         }
1797                 ret=1;
1798                 goto end;
1799                 }
1800
1801         if (peer == NULL)
1802                 {
1803                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
1804                 al=SSL_AD_UNEXPECTED_MESSAGE;
1805                 goto f_err;
1806                 }
1807
1808         if (!(type & EVP_PKT_SIGN))
1809                 {
1810                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
1811                 al=SSL_AD_ILLEGAL_PARAMETER;
1812                 goto f_err;
1813                 }
1814
1815         if (s->s3->change_cipher_spec)
1816                 {
1817                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
1818                 al=SSL_AD_UNEXPECTED_MESSAGE;
1819                 goto f_err;
1820                 }
1821
1822         /* we now have a signature that we need to verify */
1823         p=(unsigned char *)s->init_msg;
1824         n2s(p,i);
1825         n-=2;
1826         if (i > n)
1827                 {
1828                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
1829                 al=SSL_AD_DECODE_ERROR;
1830                 goto f_err;
1831                 }
1832
1833         j=EVP_PKEY_size(pkey);
1834         if ((i > j) || (n > j) || (n <= 0))
1835                 {
1836                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
1837                 al=SSL_AD_DECODE_ERROR;
1838                 goto f_err;
1839                 }
1840
1841 #ifndef OPENSSL_NO_RSA
1842         if (pkey->type == EVP_PKEY_RSA)
1843                 {
1844                 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
1845                         MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i,
1846                                                         pkey->pkey.rsa);
1847                 if (i < 0)
1848                         {
1849                         al=SSL_AD_DECRYPT_ERROR;
1850                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
1851                         goto f_err;
1852                         }
1853                 if (i == 0)
1854                         {
1855                         al=SSL_AD_DECRYPT_ERROR;
1856                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
1857                         goto f_err;
1858                         }
1859                 }
1860         else
1861 #endif
1862 #ifndef OPENSSL_NO_DSA
1863                 if (pkey->type == EVP_PKEY_DSA)
1864                 {
1865                 j=DSA_verify(pkey->save_type,
1866                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
1867                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
1868                 if (j <= 0)
1869                         {
1870                         /* bad signature */
1871                         al=SSL_AD_DECRYPT_ERROR;
1872                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
1873                         goto f_err;
1874                         }
1875                 }
1876         else
1877 #endif
1878                 {
1879                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
1880                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
1881                 goto f_err;
1882                 }
1883
1884
1885         ret=1;
1886         if (0)
1887                 {
1888 f_err:
1889                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1890                 }
1891 end:
1892         EVP_PKEY_free(pkey);
1893         return(ret);
1894         }
1895
1896 static int ssl3_get_client_certificate(SSL *s)
1897         {
1898         int i,ok,al,ret= -1;
1899         X509 *x=NULL;
1900         unsigned long l,nc,llen,n;
1901         unsigned char *p,*d,*q;
1902         STACK_OF(X509) *sk=NULL;
1903
1904         n=ssl3_get_message(s,
1905                 SSL3_ST_SR_CERT_A,
1906                 SSL3_ST_SR_CERT_B,
1907                 -1,
1908                 s->max_cert_list,
1909                 &ok);
1910
1911         if (!ok) return((int)n);
1912
1913         if      (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
1914                 {
1915                 if (    (s->verify_mode & SSL_VERIFY_PEER) &&
1916                         (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
1917                         {
1918                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
1919                         al=SSL_AD_HANDSHAKE_FAILURE;
1920                         goto f_err;
1921                         }
1922                 /* If tls asked for a client cert, the client must return a 0 list */
1923                 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
1924                         {
1925                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
1926                         al=SSL_AD_UNEXPECTED_MESSAGE;
1927                         goto f_err;
1928                         }
1929                 s->s3->tmp.reuse_message=1;
1930                 return(1);
1931                 }
1932
1933         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
1934                 {
1935                 al=SSL_AD_UNEXPECTED_MESSAGE;
1936                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
1937                 goto f_err;
1938                 }
1939         d=p=(unsigned char *)s->init_msg;
1940
1941         if ((sk=sk_X509_new_null()) == NULL)
1942                 {
1943                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1944                 goto err;
1945                 }
1946
1947         n2l3(p,llen);
1948         if (llen+3 != n)
1949                 {
1950                 al=SSL_AD_DECODE_ERROR;
1951                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
1952                 goto f_err;
1953                 }
1954         for (nc=0; nc<llen; )
1955                 {
1956                 n2l3(p,l);
1957                 if ((l+nc+3) > llen)
1958                         {
1959                         al=SSL_AD_DECODE_ERROR;
1960                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1961                         goto f_err;
1962                         }
1963
1964                 q=p;
1965                 x=d2i_X509(NULL,&p,l);
1966                 if (x == NULL)
1967                         {
1968                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
1969                         goto err;
1970                         }
1971                 if (p != (q+l))
1972                         {
1973                         al=SSL_AD_DECODE_ERROR;
1974                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1975                         goto f_err;
1976                         }
1977                 if (!sk_X509_push(sk,x))
1978                         {
1979                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1980                         goto err;
1981                         }
1982                 x=NULL;
1983                 nc+=l+3;
1984                 }
1985
1986         if (sk_X509_num(sk) <= 0)
1987                 {
1988                 /* TLS does not mind 0 certs returned */
1989                 if (s->version == SSL3_VERSION)
1990                         {
1991                         al=SSL_AD_HANDSHAKE_FAILURE;
1992                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
1993                         goto f_err;
1994                         }
1995                 /* Fail for TLS only if we required a certificate */
1996                 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
1997                          (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
1998                         {
1999                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
2000                         al=SSL_AD_HANDSHAKE_FAILURE;
2001                         goto f_err;
2002                         }
2003                 }
2004         else
2005                 {
2006                 i=ssl_verify_cert_chain(s,sk);
2007                 if (!i)
2008                         {
2009                         al=ssl_verify_alarm_type(s->verify_result);
2010                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED);
2011                         goto f_err;
2012                         }
2013                 }
2014
2015         if (s->session->peer != NULL) /* This should not be needed */
2016                 X509_free(s->session->peer);
2017         s->session->peer=sk_X509_shift(sk);
2018         s->session->verify_result = s->verify_result;
2019
2020         /* With the current implementation, sess_cert will always be NULL
2021          * when we arrive here. */
2022         if (s->session->sess_cert == NULL)
2023                 {
2024                 s->session->sess_cert = ssl_sess_cert_new();
2025                 if (s->session->sess_cert == NULL)
2026                         {
2027                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
2028                         goto err;
2029                         }
2030                 }
2031         if (s->session->sess_cert->cert_chain != NULL)
2032                 sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free);
2033         s->session->sess_cert->cert_chain=sk;
2034         /* Inconsistency alert: cert_chain does *not* include the
2035          * peer's own certificate, while we do include it in s3_clnt.c */
2036
2037         sk=NULL;
2038
2039         ret=1;
2040         if (0)
2041                 {
2042 f_err:
2043                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2044                 }
2045 err:
2046         if (x != NULL) X509_free(x);
2047         if (sk != NULL) sk_X509_pop_free(sk,X509_free);
2048         return(ret);
2049         }
2050
2051 int ssl3_send_server_certificate(SSL *s)
2052         {
2053         unsigned long l;
2054         X509 *x;
2055
2056         if (s->state == SSL3_ST_SW_CERT_A)
2057                 {
2058                 x=ssl_get_server_send_cert(s);
2059                 if (x == NULL &&
2060                         /* VRS: allow null cert if auth == KRB5 */
2061                         (s->s3->tmp.new_cipher->algorithms
2062                                 & (SSL_MKEY_MASK|SSL_AUTH_MASK))
2063                         != (SSL_aKRB5|SSL_kKRB5))
2064                         {
2065                         SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
2066                         return(0);
2067                         }
2068
2069                 l=ssl3_output_cert_chain(s,x);
2070                 s->state=SSL3_ST_SW_CERT_B;
2071                 s->init_num=(int)l;
2072                 s->init_off=0;
2073                 }
2074
2075         /* SSL3_ST_SW_CERT_B */
2076         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2077         }