crypto/openssl-0.9/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) 1998-2005 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/hmac.h>
 136 #include <openssl/x509.h>
 137 #ifndef OPENSSL_NO_DH
 138 #include <openssl/dh.h>
 139 #endif
 140 #include <openssl/bn.h>
 141 #ifndef OPENSSL_NO_KRB5
 142 #include <openssl/krb5_asn.h>
 143 #endif
 144 #include <openssl/md5.h>
 145
 146 static SSL_METHOD *ssl3_get_server_method(int ver);
 147 #ifndef OPENSSL_NO_ECDH
 148 static int nid2curve_id(int nid);
 149 #endif
 150
 151 static SSL_METHOD *ssl3_get_server_method(int ver)
 152         {
 153         if (ver == SSL3_VERSION)
 154                 return(SSLv3_server_method());
 155         else
 156                 return(NULL);
 157         }
 158
 159 IMPLEMENT_ssl3_meth_func(SSLv3_server_method,
 160                         ssl3_accept,
 161                         ssl_undefined_function,
 162                         ssl3_get_server_method)
 163
 164 int ssl3_accept(SSL *s)
 165         {
 166         BUF_MEM *buf;
 167         unsigned long l,Time=(unsigned long)time(NULL);
 168         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 169         long num1;
 170         int ret= -1;
 171         int new_state,state,skip=0;
 172
 173         RAND_add(&Time,sizeof(Time),0);
 174         ERR_clear_error();
 175         clear_sys_error();
 176
 177         if (s->info_callback != NULL)
 178                 cb=s->info_callback;
 179         else if (s->ctx->info_callback != NULL)
 180                 cb=s->ctx->info_callback;
 181
 182         /* init things to blank */
 183         s->in_handshake++;
 184         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 185
 186         if (s->cert == NULL)
 187                 {
 188                 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
 189                 return(-1);
 190                 }
 191
 192         for (;;)
 193                 {
 194                 state=s->state;
 195
 196                 switch (s->state)
 197                         {
 198                 case SSL_ST_RENEGOTIATE:
 199                         s->new_session=1;
 200                         /* s->state=SSL_ST_ACCEPT; */
 201
 202                 case SSL_ST_BEFORE:
 203                 case SSL_ST_ACCEPT:
 204                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 205                 case SSL_ST_OK|SSL_ST_ACCEPT:
 206
 207                         s->server=1;
 208                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 209
 210                         if ((s->version>>8) != 3)
 211                                 {
 212                                 SSLerr(SSL_F_SSL3_ACCEPT, ERR_R_INTERNAL_ERROR);
 213                                 return -1;
 214                                 }
 215                         s->type=SSL_ST_ACCEPT;
 216
 217                         if (s->init_buf == NULL)
 218                                 {
 219                                 if ((buf=BUF_MEM_new()) == NULL)
 220                                         {
 221                                         ret= -1;
 222                                         goto end;
 223                                         }
 224                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 225                                         {
 226                                         ret= -1;
 227                                         goto end;
 228                                         }
 229                                 s->init_buf=buf;
 230                                 }
 231
 232                         if (!ssl3_setup_buffers(s))
 233                                 {
 234                                 ret= -1;
 235                                 goto end;
 236                                 }
 237
 238                         s->init_num=0;
 239
 240                         if (s->state != SSL_ST_RENEGOTIATE)
 241                                 {
 242                                 /* Ok, we now need to push on a buffering BIO so that
 243                                  * the output is sent in a way that TCP likes :-)
 244                                  */
 245                                 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
 246
 247                                 ssl3_init_finished_mac(s);
 248                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
 249                                 s->ctx->stats.sess_accept++;
 250                                 }
 251                         else
 252                                 {
 253                                 /* s->state == SSL_ST_RENEGOTIATE,
 254                                  * we will just send a HelloRequest */
 255                                 s->ctx->stats.sess_accept_renegotiate++;
 256                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
 257                                 }
 258                         break;
 259
 260                 case SSL3_ST_SW_HELLO_REQ_A:
 261                 case SSL3_ST_SW_HELLO_REQ_B:
 262
 263                         s->shutdown=0;
 264                         ret=ssl3_send_hello_request(s);
 265                         if (ret <= 0) goto end;
 266                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
 267                         s->state=SSL3_ST_SW_FLUSH;
 268                         s->init_num=0;
 269
 270                         ssl3_init_finished_mac(s);
 271                         break;
 272
 273                 case SSL3_ST_SW_HELLO_REQ_C:
 274                         s->state=SSL_ST_OK;
 275                         break;
 276
 277                 case SSL3_ST_SR_CLNT_HELLO_A:
 278                 case SSL3_ST_SR_CLNT_HELLO_B:
 279                 case SSL3_ST_SR_CLNT_HELLO_C:
 280
 281                         s->shutdown=0;
 282                         ret=ssl3_get_client_hello(s);
 283                         if (ret <= 0) goto end;
 284                         s->new_session = 2;
 285                         s->state=SSL3_ST_SW_SRVR_HELLO_A;
 286                         s->init_num=0;
 287                         break;
 288
 289                 case SSL3_ST_SW_SRVR_HELLO_A:
 290                 case SSL3_ST_SW_SRVR_HELLO_B:
 291                         ret=ssl3_send_server_hello(s);
 292                         if (ret <= 0) goto end;
 293
 294                         if (s->hit)
 295                                 s->state=SSL3_ST_SW_CHANGE_A;
 296                         else
 297                                 s->state=SSL3_ST_SW_CERT_A;
 298                         s->init_num=0;
 299                         break;
 300
 301                 case SSL3_ST_SW_CERT_A:
 302                 case SSL3_ST_SW_CERT_B:
 303                         /* Check if it is anon DH or anon ECDH or KRB5 */
 304                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL)
 305                                 && !(s->s3->tmp.new_cipher->algorithms & SSL_aKRB5))
 306                                 {
 307                                 ret=ssl3_send_server_certificate(s);
 308                                 if (ret <= 0) goto end;
 309                                 }
 310                         else
 311                                 skip=1;
 312                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 313                         s->init_num=0;
 314                         break;
 315
 316                 case SSL3_ST_SW_KEY_EXCH_A:
 317                 case SSL3_ST_SW_KEY_EXCH_B:
 318                         l=s->s3->tmp.new_cipher->algorithms;
 319
 320                         /* clear this, it may get reset by
 321                          * send_server_key_exchange */
 322                         if ((s->options & SSL_OP_EPHEMERAL_RSA)
 323 #ifndef OPENSSL_NO_KRB5
 324                                 && !(l & SSL_KRB5)
 325 #endif /* OPENSSL_NO_KRB5 */
 326                                 )
 327                                 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
 328                                  * even when forbidden by protocol specs
 329                                  * (handshake may fail as clients are not required to
 330                                  * be able to handle this) */
 331                                 s->s3->tmp.use_rsa_tmp=1;
 332                         else
 333                                 s->s3->tmp.use_rsa_tmp=0;
 334
 335
 336                         /* only send if a DH key exchange, fortezza or
 337                          * RSA but we have a sign only certificate
 338                          *
 339                          * For ECC ciphersuites, we send a serverKeyExchange
 340                          * message only if the cipher suite is either
 341                          * ECDH-anon or ECDHE. In other cases, the
 342                          * server certificate contains the server's
 343                          * public key for key exchange.
 344                          */
 345                         if (s->s3->tmp.use_rsa_tmp
 346                             || (l & SSL_kECDHE)
 347                             || (l & (SSL_DH|SSL_kFZA))
 348                             || ((l & SSL_kRSA)
 349                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
 350                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
 351                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
 352                                         )
 353                                     )
 354                                 )
 355                             )
 356                                 {
 357                                 ret=ssl3_send_server_key_exchange(s);
 358                                 if (ret <= 0) goto end;
 359                                 }
 360                         else
 361                                 skip=1;
 362
 363                         s->state=SSL3_ST_SW_CERT_REQ_A;
 364                         s->init_num=0;
 365                         break;
 366
 367                 case SSL3_ST_SW_CERT_REQ_A:
 368                 case SSL3_ST_SW_CERT_REQ_B:
 369                         if (/* don't request cert unless asked for it: */
 370                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
 371                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
 372                                  * don't request cert during re-negotiation: */
 373                                 ((s->session->peer != NULL) &&
 374                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
 375                                 /* never request cert in anonymous ciphersuites
 376                                  * (see section "Certificate request" in SSL 3 drafts
 377                                  * and in RFC 2246): */
 378                                 ((s->s3->tmp.new_cipher->algorithms & SSL_aNULL) &&
 379                                  /* ... except when the application insists on verification
 380                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
 381                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
 382                                  /* never request cert in Kerberos ciphersuites */
 383                                 (s->s3->tmp.new_cipher->algorithms & SSL_aKRB5))
 384                                 {
 385                                 /* no cert request */
 386                                 skip=1;
 387                                 s->s3->tmp.cert_request=0;
 388                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 389                                 }
 390                         else
 391                                 {
 392                                 s->s3->tmp.cert_request=1;
 393                                 ret=ssl3_send_certificate_request(s);
 394                                 if (ret <= 0) goto end;
 395 #ifndef NETSCAPE_HANG_BUG
 396                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 397 #else
 398                                 s->state=SSL3_ST_SW_FLUSH;
 399                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 400 #endif
 401                                 s->init_num=0;
 402                                 }
 403                         break;
 404
 405                 case SSL3_ST_SW_SRVR_DONE_A:
 406                 case SSL3_ST_SW_SRVR_DONE_B:
 407                         ret=ssl3_send_server_done(s);
 408                         if (ret <= 0) goto end;
 409                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 410                         s->state=SSL3_ST_SW_FLUSH;
 411                         s->init_num=0;
 412                         break;
 413
 414                 case SSL3_ST_SW_FLUSH:
 415                         /* number of bytes to be flushed */
 416                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 417                         if (num1 > 0)
 418                                 {
 419                                 s->rwstate=SSL_WRITING;
 420                                 num1=BIO_flush(s->wbio);
 421                                 if (num1 <= 0) { ret= -1; goto end; }
 422                                 s->rwstate=SSL_NOTHING;
 423                                 }
 424
 425                         s->state=s->s3->tmp.next_state;
 426                         break;
 427
 428                 case SSL3_ST_SR_CERT_A:
 429                 case SSL3_ST_SR_CERT_B:
 430                         /* Check for second client hello (MS SGC) */
 431                         ret = ssl3_check_client_hello(s);
 432                         if (ret <= 0)
 433                                 goto end;
 434                         if (ret == 2)
 435                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
 436                         else {
 437                                 if (s->s3->tmp.cert_request)
 438                                         {
 439                                         ret=ssl3_get_client_certificate(s);
 440                                         if (ret <= 0) goto end;
 441                                         }
 442                                 s->init_num=0;
 443                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
 444                         }
 445                         break;
 446
 447                 case SSL3_ST_SR_KEY_EXCH_A:
 448                 case SSL3_ST_SR_KEY_EXCH_B:
 449                         ret=ssl3_get_client_key_exchange(s);
 450                         if (ret <= 0)
 451                                 goto end;
 452                         if (ret == 2)
 453                                 {
 454                                 /* For the ECDH ciphersuites when
 455                                  * the client sends its ECDH pub key in
 456                                  * a certificate, the CertificateVerify
 457                                  * message is not sent.
 458                                  */
 459                                 s->state=SSL3_ST_SR_FINISHED_A;
 460                                 s->init_num = 0;
 461                                 }
 462                         else
 463                                 {
 464                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
 465                                 s->init_num=0;
 466
 467                                 /* We need to get hashes here so if there is
 468                                  * a client cert, it can be verified
 469                                  */
 470                                 s->method->ssl3_enc->cert_verify_mac(s,
 471                                     &(s->s3->finish_dgst1),
 472                                     &(s->s3->tmp.cert_verify_md[0]));
 473                                 s->method->ssl3_enc->cert_verify_mac(s,
 474                                     &(s->s3->finish_dgst2),
 475                                     &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
 476                                 }
 477                         break;
 478
 479                 case SSL3_ST_SR_CERT_VRFY_A:
 480                 case SSL3_ST_SR_CERT_VRFY_B:
 481
 482                         /* we should decide if we expected this one */
 483                         ret=ssl3_get_cert_verify(s);
 484                         if (ret <= 0) goto end;
 485
 486                         s->state=SSL3_ST_SR_FINISHED_A;
 487                         s->init_num=0;
 488                         break;
 489
 490                 case SSL3_ST_SR_FINISHED_A:
 491                 case SSL3_ST_SR_FINISHED_B:
 492                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
 493                                 SSL3_ST_SR_FINISHED_B);
 494                         if (ret <= 0) goto end;
 495                         if (s->hit)
 496                                 s->state=SSL_ST_OK;
 497 #ifndef OPENSSL_NO_TLSEXT
 498                         else if (s->tlsext_ticket_expected)
 499                                 s->state=SSL3_ST_SW_SESSION_TICKET_A;
 500 #endif
 501                         else
 502                                 s->state=SSL3_ST_SW_CHANGE_A;
 503                         s->init_num=0;
 504                         break;
 505
 506 #ifndef OPENSSL_NO_TLSEXT
 507                 case SSL3_ST_SW_SESSION_TICKET_A:
 508                 case SSL3_ST_SW_SESSION_TICKET_B:
 509                         ret=ssl3_send_newsession_ticket(s);
 510                         if (ret <= 0) goto end;
 511                         s->state=SSL3_ST_SW_CHANGE_A;
 512                         s->init_num=0;
 513                         break;
 514
 515 #endif
 516
 517                 case SSL3_ST_SW_CHANGE_A:
 518                 case SSL3_ST_SW_CHANGE_B:
 519
 520                         s->session->cipher=s->s3->tmp.new_cipher;
 521                         if (!s->method->ssl3_enc->setup_key_block(s))
 522                                 { ret= -1; goto end; }
 523
 524                         ret=ssl3_send_change_cipher_spec(s,
 525                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
 526
 527                         if (ret <= 0) goto end;
 528                         s->state=SSL3_ST_SW_FINISHED_A;
 529                         s->init_num=0;
 530
 531                         if (!s->method->ssl3_enc->change_cipher_state(s,
 532                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
 533                                 {
 534                                 ret= -1;
 535                                 goto end;
 536                                 }
 537
 538                         break;
 539
 540                 case SSL3_ST_SW_FINISHED_A:
 541                 case SSL3_ST_SW_FINISHED_B:
 542                         ret=ssl3_send_finished(s,
 543                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
 544                                 s->method->ssl3_enc->server_finished_label,
 545                                 s->method->ssl3_enc->server_finished_label_len);
 546                         if (ret <= 0) goto end;
 547                         s->state=SSL3_ST_SW_FLUSH;
 548                         if (s->hit)
 549                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 550                         else
 551                                 s->s3->tmp.next_state=SSL_ST_OK;
 552                         s->init_num=0;
 553                         break;
 554
 555                 case SSL_ST_OK:
 556                         /* clean a few things up */
 557                         ssl3_cleanup_key_block(s);
 558
 559                         BUF_MEM_free(s->init_buf);
 560                         s->init_buf=NULL;
 561
 562                         /* remove buffering on output */
 563                         ssl_free_wbio_buffer(s);
 564
 565                         s->init_num=0;
 566
 567                         if (s->new_session == 2) /* skipped if we just sent a HelloRequest */
 568                                 {
 569                                 /* actually not necessarily a 'new' session unless
 570                                  * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */
 571
 572                                 s->new_session=0;
 573
 574                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 575
 576                                 s->ctx->stats.sess_accept_good++;
 577                                 /* s->server=1; */
 578                                 s->handshake_func=ssl3_accept;
 579
 580                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 581                                 }
 582
 583                         ret = 1;
 584                         goto end;
 585                         /* break; */
 586
 587                 default:
 588                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
 589                         ret= -1;
 590                         goto end;
 591                         /* break; */
 592                         }
 593
 594                 if (!s->s3->tmp.reuse_message && !skip)
 595                         {
 596                         if (s->debug)
 597                                 {
 598                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 599                                         goto end;
 600                                 }
 601
 602
 603                         if ((cb != NULL) && (s->state != state))
 604                                 {
 605                                 new_state=s->state;
 606                                 s->state=state;
 607                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
 608                                 s->state=new_state;
 609                                 }
 610                         }
 611                 skip=0;
 612                 }
 613 end:
 614         /* BIO_flush(s->wbio); */
 615
 616         s->in_handshake--;
 617         if (cb != NULL)
 618                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 619         return(ret);
 620         }
 621
 622 int ssl3_send_hello_request(SSL *s)
 623         {
 624         unsigned char *p;
 625
 626         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
 627                 {
 628                 p=(unsigned char *)s->init_buf->data;
 629                 *(p++)=SSL3_MT_HELLO_REQUEST;
 630                 *(p++)=0;
 631                 *(p++)=0;
 632                 *(p++)=0;
 633
 634                 s->state=SSL3_ST_SW_HELLO_REQ_B;
 635                 /* number of bytes to write */
 636                 s->init_num=4;
 637                 s->init_off=0;
 638                 }
 639
 640         /* SSL3_ST_SW_HELLO_REQ_B */
 641         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 642         }
 643
 644 int ssl3_check_client_hello(SSL *s)
 645         {
 646         int ok;
 647         long n;
 648
 649         /* this function is called when we really expect a Certificate message,
 650          * so permit appropriate message length */
 651         n=s->method->ssl_get_message(s,
 652                 SSL3_ST_SR_CERT_A,
 653                 SSL3_ST_SR_CERT_B,
 654                 -1,
 655                 s->max_cert_list,
 656                 &ok);
 657         if (!ok) return((int)n);
 658         s->s3->tmp.reuse_message = 1;
 659         if (s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO)
 660                 {
 661                 /* Throw away what we have done so far in the current handshake,
 662                  * which will now be aborted. (A full SSL_clear would be too much.)
 663                  * I hope that tmp.dh is the only thing that may need to be cleared
 664                  * when a handshake is not completed ... */
 665 #ifndef OPENSSL_NO_DH
 666                 if (s->s3->tmp.dh != NULL)
 667                         {
 668                         DH_free(s->s3->tmp.dh);
 669                         s->s3->tmp.dh = NULL;
 670                         }
 671 #endif
 672                 return 2;
 673                 }
 674         return 1;
 675 }
 676
 677 int ssl3_get_client_hello(SSL *s)
 678         {
 679         int i,j,ok,al,ret= -1;
 680         unsigned int cookie_len;
 681         long n;
 682         unsigned long id;
 683         unsigned char *p,*d,*q;
 684         SSL_CIPHER *c;
 685 #ifndef OPENSSL_NO_COMP
 686         SSL_COMP *comp=NULL;
 687 #endif
 688         STACK_OF(SSL_CIPHER) *ciphers=NULL;
 689
 690         /* We do this so that we will respond with our native type.
 691          * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
 692          * This down switching should be handled by a different method.
 693          * If we are SSLv3, we will respond with SSLv3, even if prompted with
 694          * TLSv1.
 695          */
 696         if (s->state == SSL3_ST_SR_CLNT_HELLO_A)
 697                 {
 698                 s->state=SSL3_ST_SR_CLNT_HELLO_B;
 699                 }
 700         s->first_packet=1;
 701         n=s->method->ssl_get_message(s,
 702                 SSL3_ST_SR_CLNT_HELLO_B,
 703                 SSL3_ST_SR_CLNT_HELLO_C,
 704                 SSL3_MT_CLIENT_HELLO,
 705                 SSL3_RT_MAX_PLAIN_LENGTH,
 706                 &ok);
 707
 708         if (!ok) return((int)n);
 709         s->first_packet=0;
 710         d=p=(unsigned char *)s->init_msg;
 711
 712         /* use version from inside client hello, not from record header
 713          * (may differ: see RFC 2246, Appendix E, second paragraph) */
 714         s->client_version=(((int)p[0])<<8)|(int)p[1];
 715         p+=2;
 716
 717         if ((s->version == DTLS1_VERSION && s->client_version > s->version) ||
 718             (s->version != DTLS1_VERSION && s->client_version < s->version))
 719                 {
 720                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER);
 721                 if ((s->client_version>>8) == SSL3_VERSION_MAJOR)
 722                         {
 723                         /* similar to ssl3_get_record, send alert using remote version number */
 724                         s->version = s->client_version;
 725                         }
 726                 al = SSL_AD_PROTOCOL_VERSION;
 727                 goto f_err;
 728                 }
 729
 730         /* load the client random */
 731         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
 732         p+=SSL3_RANDOM_SIZE;
 733
 734         /* get the session-id */
 735         j= *(p++);
 736
 737         s->hit=0;
 738         /* Versions before 0.9.7 always allow session reuse during renegotiation
 739          * (i.e. when s->new_session is true), option
 740          * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is new with 0.9.7.
 741          * Maybe this optional behaviour should always have been the default,
 742          * but we cannot safely change the default behaviour (or new applications
 743          * might be written that become totally unsecure when compiled with
 744          * an earlier library version)
 745          */
 746         if ((s->new_session && (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION)))
 747                 {
 748                 if (!ssl_get_new_session(s,1))
 749                         goto err;
 750                 }
 751         else
 752                 {
 753                 i=ssl_get_prev_session(s, p, j, d + n);
 754                 if (i == 1)
 755                         { /* previous session */
 756                         s->hit=1;
 757                         }
 758                 else if (i == -1)
 759                         goto err;
 760                 else /* i == 0 */
 761                         {
 762                         if (!ssl_get_new_session(s,1))
 763                                 goto err;
 764                         }
 765                 }
 766
 767         p+=j;
 768
 769         if (s->version == DTLS1_VERSION)
 770                 {
 771                 /* cookie stuff */
 772                 cookie_len = *(p++);
 773
 774                 if ( (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) &&
 775                         s->d1->send_cookie == 0)
 776                         {
 777                         /* HelloVerifyMessage has already been sent */
 778                         if ( cookie_len != s->d1->cookie_len)
 779                                 {
 780                                 al = SSL_AD_HANDSHAKE_FAILURE;
 781                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
 782                                 goto f_err;
 783                                 }
 784                         }
 785
 786                 /*
 787                  * The ClientHello may contain a cookie even if the
 788                  * HelloVerify message has not been sent--make sure that it
 789                  * does not cause an overflow.
 790                  */
 791                 if ( cookie_len > sizeof(s->d1->rcvd_cookie))
 792                         {
 793                         /* too much data */
 794                         al = SSL_AD_DECODE_ERROR;
 795                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
 796                         goto f_err;
 797                         }
 798
 799                 /* verify the cookie if appropriate option is set. */
 800                 if ( (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) &&
 801                         cookie_len > 0)
 802                         {
 803                         memcpy(s->d1->rcvd_cookie, p, cookie_len);
 804
 805                         if ( s->ctx->app_verify_cookie_cb != NULL)
 806                                 {
 807                                 if ( s->ctx->app_verify_cookie_cb(s, s->d1->rcvd_cookie,
 808                                         cookie_len) == 0)
 809                                         {
 810                                         al=SSL_AD_HANDSHAKE_FAILURE;
 811                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
 812                                                 SSL_R_COOKIE_MISMATCH);
 813                                         goto f_err;
 814                                         }
 815                                 /* else cookie verification succeeded */
 816                                 }
 817                         else if ( memcmp(s->d1->rcvd_cookie, s->d1->cookie,
 818                                                   s->d1->cookie_len) != 0) /* default verification */
 819                                 {
 820                                         al=SSL_AD_HANDSHAKE_FAILURE;
 821                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
 822                                                 SSL_R_COOKIE_MISMATCH);
 823                                         goto f_err;
 824                                 }
 825                         }
 826
 827                 p += cookie_len;
 828                 }
 829
 830         n2s(p,i);
 831         if ((i == 0) && (j != 0))
 832                 {
 833                 /* we need a cipher if we are not resuming a session */
 834                 al=SSL_AD_ILLEGAL_PARAMETER;
 835                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
 836                 goto f_err;
 837                 }
 838         if ((p+i) >= (d+n))
 839                 {
 840                 /* not enough data */
 841                 al=SSL_AD_DECODE_ERROR;
 842                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 843                 goto f_err;
 844                 }
 845         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
 846                 == NULL))
 847                 {
 848                 goto err;
 849                 }
 850         p+=i;
 851
 852         /* If it is a hit, check that the cipher is in the list */
 853         if ((s->hit) && (i > 0))
 854                 {
 855                 j=0;
 856                 id=s->session->cipher->id;
 857
 858 #ifdef CIPHER_DEBUG
 859                 printf("client sent %d ciphers\n",sk_num(ciphers));
 860 #endif
 861                 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
 862                         {
 863                         c=sk_SSL_CIPHER_value(ciphers,i);
 864 #ifdef CIPHER_DEBUG
 865                         printf("client [%2d of %2d]:%s\n",
 866                                 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
 867 #endif
 868                         if (c->id == id)
 869                                 {
 870                                 j=1;
 871                                 break;
 872                                 }
 873                         }
 874                 if (j == 0)
 875                         {
 876                         if ((s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
 877                                 {
 878                                 /* Very bad for multi-threading.... */
 879                                 s->session->cipher=sk_SSL_CIPHER_value(ciphers, 0);
 880                                 }
 881                         else
 882                                 {
 883                                 /* we need to have the cipher in the cipher
 884                                  * list if we are asked to reuse it */
 885                                 al=SSL_AD_ILLEGAL_PARAMETER;
 886                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
 887                                 goto f_err;
 888                                 }
 889                         }
 890                 }
 891
 892         /* compression */
 893         i= *(p++);
 894         if ((p+i) > (d+n))
 895                 {
 896                 /* not enough data */
 897                 al=SSL_AD_DECODE_ERROR;
 898                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 899                 goto f_err;
 900                 }
 901         q=p;
 902         for (j=0; j<i; j++)
 903                 {
 904                 if (p[j] == 0) break;
 905                 }
 906
 907         p+=i;
 908         if (j >= i)
 909                 {
 910                 /* no compress */
 911                 al=SSL_AD_DECODE_ERROR;
 912                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
 913                 goto f_err;
 914                 }
 915
 916 #ifndef OPENSSL_NO_TLSEXT
 917         /* TLS extensions*/
 918         if (s->version > SSL3_VERSION)
 919                 {
 920                 if (!ssl_parse_clienthello_tlsext(s,&p,d,n, &al))
 921                         {
 922                         /* 'al' set by ssl_parse_clienthello_tlsext */
 923                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_PARSE_TLSEXT);
 924                         goto f_err;
 925                         }
 926                 }
 927                 if (ssl_check_clienthello_tlsext(s) <= 0) {
 928                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
 929                         goto err;
 930                 }
 931 #endif
 932         /* Worst case, we will use the NULL compression, but if we have other
 933          * options, we will now look for them.  We have i-1 compression
 934          * algorithms from the client, starting at q. */
 935         s->s3->tmp.new_compression=NULL;
 936 #ifndef OPENSSL_NO_COMP
 937         if (s->ctx->comp_methods != NULL)
 938                 { /* See if we have a match */
 939                 int m,nn,o,v,done=0;
 940
 941                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
 942                 for (m=0; m<nn; m++)
 943                         {
 944                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
 945                         v=comp->id;
 946                         for (o=0; o<i; o++)
 947                                 {
 948                                 if (v == q[o])
 949                                         {
 950                                         done=1;
 951                                         break;
 952                                         }
 953                                 }
 954                         if (done) break;
 955                         }
 956                 if (done)
 957                         s->s3->tmp.new_compression=comp;
 958                 else
 959                         comp=NULL;
 960                 }
 961 #endif
 962
 963         /* TLS does not mind if there is extra stuff */
 964 #if 0   /* SSL 3.0 does not mind either, so we should disable this test
 965          * (was enabled in 0.9.6d through 0.9.6j and 0.9.7 through 0.9.7b,
 966          * in earlier SSLeay/OpenSSL releases this test existed but was buggy) */
 967         if (s->version == SSL3_VERSION)
 968                 {
 969                 if (p < (d+n))
 970                         {
 971                         /* wrong number of bytes,
 972                          * there could be more to follow */
 973                         al=SSL_AD_DECODE_ERROR;
 974                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 975                         goto f_err;
 976                         }
 977                 }
 978 #endif
 979
 980         /* Given s->session->ciphers and SSL_get_ciphers, we must
 981          * pick a cipher */
 982
 983         if (!s->hit)
 984                 {
 985 #ifdef OPENSSL_NO_COMP
 986                 s->session->compress_meth=0;
 987 #else
 988                 s->session->compress_meth=(comp == NULL)?0:comp->id;
 989 #endif
 990                 if (s->session->ciphers != NULL)
 991                         sk_SSL_CIPHER_free(s->session->ciphers);
 992                 s->session->ciphers=ciphers;
 993                 if (ciphers == NULL)
 994                         {
 995                         al=SSL_AD_ILLEGAL_PARAMETER;
 996                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
 997                         goto f_err;
 998                         }
 999                 ciphers=NULL;
1000                 c=ssl3_choose_cipher(s,s->session->ciphers,
1001                                      SSL_get_ciphers(s));
1002
1003                 if (c == NULL)
1004                         {
1005                         al=SSL_AD_HANDSHAKE_FAILURE;
1006                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1007                         goto f_err;
1008                         }
1009                 s->s3->tmp.new_cipher=c;
1010                 }
1011         else
1012                 {
1013                 /* Session-id reuse */
1014 #ifdef REUSE_CIPHER_BUG
1015                 STACK_OF(SSL_CIPHER) *sk;
1016                 SSL_CIPHER *nc=NULL;
1017                 SSL_CIPHER *ec=NULL;
1018
1019                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
1020                         {
1021                         sk=s->session->ciphers;
1022                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
1023                                 {
1024                                 c=sk_SSL_CIPHER_value(sk,i);
1025                                 if (c->algorithms & SSL_eNULL)
1026                                         nc=c;
1027                                 if (SSL_C_IS_EXPORT(c))
1028                                         ec=c;
1029                                 }
1030                         if (nc != NULL)
1031                                 s->s3->tmp.new_cipher=nc;
1032                         else if (ec != NULL)
1033                                 s->s3->tmp.new_cipher=ec;
1034                         else
1035                                 s->s3->tmp.new_cipher=s->session->cipher;
1036                         }
1037                 else
1038 #endif
1039                 s->s3->tmp.new_cipher=s->session->cipher;
1040                 }
1041
1042         /* we now have the following setup.
1043          * client_random
1044          * cipher_list          - our prefered list of ciphers
1045          * ciphers              - the clients prefered list of ciphers
1046          * compression          - basically ignored right now
1047          * ssl version is set   - sslv3
1048          * s->session           - The ssl session has been setup.
1049          * s->hit               - session reuse flag
1050          * s->tmp.new_cipher    - the new cipher to use.
1051          */
1052
1053         ret=1;
1054         if (0)
1055                 {
1056 f_err:
1057                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1058                 }
1059 err:
1060         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
1061         return(ret);
1062         }
1063
1064 int ssl3_send_server_hello(SSL *s)
1065         {
1066         unsigned char *buf;
1067         unsigned char *p,*d;
1068         int i,sl;
1069         unsigned long l,Time;
1070
1071         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
1072                 {
1073                 buf=(unsigned char *)s->init_buf->data;
1074                 p=s->s3->server_random;
1075                 Time=(unsigned long)time(NULL);                 /* Time */
1076                 l2n(Time,p);
1077                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
1078                         return -1;
1079                 /* Do the message type and length last */
1080                 d=p= &(buf[4]);
1081
1082                 *(p++)=s->version>>8;
1083                 *(p++)=s->version&0xff;
1084
1085                 /* Random stuff */
1086                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
1087                 p+=SSL3_RANDOM_SIZE;
1088
1089                 /* now in theory we have 3 options to sending back the
1090                  * session id.  If it is a re-use, we send back the
1091                  * old session-id, if it is a new session, we send
1092                  * back the new session-id or we send back a 0 length
1093                  * session-id if we want it to be single use.
1094                  * Currently I will not implement the '0' length session-id
1095                  * 12-Jan-98 - I'll now support the '0' length stuff.
1096                  */
1097                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
1098                         s->session->session_id_length=0;
1099
1100                 sl=s->session->session_id_length;
1101                 if (sl > (int)sizeof(s->session->session_id))
1102                         {
1103                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1104                         return -1;
1105                         }
1106                 *(p++)=sl;
1107                 memcpy(p,s->session->session_id,sl);
1108                 p+=sl;
1109
1110                 /* put the cipher */
1111                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
1112                 p+=i;
1113
1114                 /* put the compression method */
1115 #ifdef OPENSSL_NO_COMP
1116                         *(p++)=0;
1117 #else
1118                 if (s->s3->tmp.new_compression == NULL)
1119                         *(p++)=0;
1120                 else
1121                         *(p++)=s->s3->tmp.new_compression->id;
1122 #endif
1123 #ifndef OPENSSL_NO_TLSEXT
1124                 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
1125                         {
1126                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
1127                         return -1;
1128                         }
1129 #endif
1130                 /* do the header */
1131                 l=(p-d);
1132                 d=buf;
1133                 *(d++)=SSL3_MT_SERVER_HELLO;
1134                 l2n3(l,d);
1135
1136                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
1137                 /* number of bytes to write */
1138                 s->init_num=p-buf;
1139                 s->init_off=0;
1140                 }
1141
1142         /* SSL3_ST_CW_CLNT_HELLO_B */
1143         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1144         }
1145
1146 int ssl3_send_server_done(SSL *s)
1147         {
1148         unsigned char *p;
1149
1150         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1151                 {
1152                 p=(unsigned char *)s->init_buf->data;
1153
1154                 /* do the header */
1155                 *(p++)=SSL3_MT_SERVER_DONE;
1156                 *(p++)=0;
1157                 *(p++)=0;
1158                 *(p++)=0;
1159
1160                 s->state=SSL3_ST_SW_SRVR_DONE_B;
1161                 /* number of bytes to write */
1162                 s->init_num=4;
1163                 s->init_off=0;
1164                 }
1165
1166         /* SSL3_ST_CW_CLNT_HELLO_B */
1167         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1168         }
1169
1170 int ssl3_send_server_key_exchange(SSL *s)
1171         {
1172 #ifndef OPENSSL_NO_RSA
1173         unsigned char *q;
1174         int j,num;
1175         RSA *rsa;
1176         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1177         unsigned int u;
1178 #endif
1179 #ifndef OPENSSL_NO_DH
1180         DH *dh=NULL,*dhp;
1181 #endif
1182 #ifndef OPENSSL_NO_ECDH
1183         EC_KEY *ecdh=NULL, *ecdhp;
1184         unsigned char *encodedPoint = NULL;
1185         int encodedlen = 0;
1186         int curve_id = 0;
1187         BN_CTX *bn_ctx = NULL;
1188 #endif
1189         EVP_PKEY *pkey;
1190         unsigned char *p,*d;
1191         int al,i;
1192         unsigned long type;
1193         int n;
1194         CERT *cert;
1195         BIGNUM *r[4];
1196         int nr[4],kn;
1197         BUF_MEM *buf;
1198         EVP_MD_CTX md_ctx;
1199
1200         EVP_MD_CTX_init(&md_ctx);
1201         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1202                 {
1203                 type=s->s3->tmp.new_cipher->algorithms & SSL_MKEY_MASK;
1204                 cert=s->cert;
1205
1206                 buf=s->init_buf;
1207
1208                 r[0]=r[1]=r[2]=r[3]=NULL;
1209                 n=0;
1210 #ifndef OPENSSL_NO_RSA
1211                 if (type & SSL_kRSA)
1212                         {
1213                         rsa=cert->rsa_tmp;
1214                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1215                                 {
1216                                 rsa=s->cert->rsa_tmp_cb(s,
1217                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1218                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1219                                 if(rsa == NULL)
1220                                 {
1221                                         al=SSL_AD_HANDSHAKE_FAILURE;
1222                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1223                                         goto f_err;
1224                                 }
1225                                 RSA_up_ref(rsa);
1226                                 cert->rsa_tmp=rsa;
1227                                 }
1228                         if (rsa == NULL)
1229                                 {
1230                                 al=SSL_AD_HANDSHAKE_FAILURE;
1231                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1232                                 goto f_err;
1233                                 }
1234                         r[0]=rsa->n;
1235                         r[1]=rsa->e;
1236                         s->s3->tmp.use_rsa_tmp=1;
1237                         }
1238                 else
1239 #endif
1240 #ifndef OPENSSL_NO_DH
1241                         if (type & SSL_kEDH)
1242                         {
1243                         dhp=cert->dh_tmp;
1244                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1245                                 dhp=s->cert->dh_tmp_cb(s,
1246                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1247                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1248                         if (dhp == NULL)
1249                                 {
1250                                 al=SSL_AD_HANDSHAKE_FAILURE;
1251                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1252                                 goto f_err;
1253                                 }
1254
1255                         if (s->s3->tmp.dh != NULL)
1256                                 {
1257                                 DH_free(dh);
1258                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1259                                 goto err;
1260                                 }
1261
1262                         if ((dh=DHparams_dup(dhp)) == NULL)
1263                                 {
1264                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1265                                 goto err;
1266                                 }
1267
1268                         s->s3->tmp.dh=dh;
1269                         if ((dhp->pub_key == NULL ||
1270                              dhp->priv_key == NULL ||
1271                              (s->options & SSL_OP_SINGLE_DH_USE)))
1272                                 {
1273                                 if(!DH_generate_key(dh))
1274                                     {
1275                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1276                                            ERR_R_DH_LIB);
1277                                     goto err;
1278                                     }
1279                                 }
1280                         else
1281                                 {
1282                                 dh->pub_key=BN_dup(dhp->pub_key);
1283                                 dh->priv_key=BN_dup(dhp->priv_key);
1284                                 if ((dh->pub_key == NULL) ||
1285                                         (dh->priv_key == NULL))
1286                                         {
1287                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1288                                         goto err;
1289                                         }
1290                                 }
1291                         r[0]=dh->p;
1292                         r[1]=dh->g;
1293                         r[2]=dh->pub_key;
1294                         }
1295                 else
1296 #endif
1297 #ifndef OPENSSL_NO_ECDH
1298                         if (type & SSL_kECDHE)
1299                         {
1300                         const EC_GROUP *group;
1301
1302                         ecdhp=cert->ecdh_tmp;
1303                         if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
1304                                 {
1305                                 ecdhp=s->cert->ecdh_tmp_cb(s,
1306                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1307                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1308                                 }
1309                         if (ecdhp == NULL)
1310                                 {
1311                                 al=SSL_AD_HANDSHAKE_FAILURE;
1312                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1313                                 goto f_err;
1314                                 }
1315
1316                         if (s->s3->tmp.ecdh != NULL)
1317                                 {
1318                                 EC_KEY_free(s->s3->tmp.ecdh);
1319                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1320                                 goto err;
1321                                 }
1322
1323                         /* Duplicate the ECDH structure. */
1324                         if (ecdhp == NULL)
1325                                 {
1326                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1327                                 goto err;
1328                                 }
1329                         if (!EC_KEY_up_ref(ecdhp))
1330                                 {
1331                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1332                                 goto err;
1333                                 }
1334                         ecdh = ecdhp;
1335
1336                         s->s3->tmp.ecdh=ecdh;
1337                         if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1338                             (EC_KEY_get0_private_key(ecdh) == NULL) ||
1339                             (s->options & SSL_OP_SINGLE_ECDH_USE))
1340                                 {
1341                                 if(!EC_KEY_generate_key(ecdh))
1342                                     {
1343                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1344                                     goto err;
1345                                     }
1346                                 }
1347
1348                         if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1349                             (EC_KEY_get0_public_key(ecdh)  == NULL) ||
1350                             (EC_KEY_get0_private_key(ecdh) == NULL))
1351                                 {
1352                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1353                                 goto err;
1354                                 }
1355
1356                         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1357                             (EC_GROUP_get_degree(group) > 163))
1358                                 {
1359                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1360                                 goto err;
1361                                 }
1362
1363                         /* XXX: For now, we only support ephemeral ECDH
1364                          * keys over named (not generic) curves. For
1365                          * supported named curves, curve_id is non-zero.
1366                          */
1367                         if ((curve_id =
1368                             nid2curve_id(EC_GROUP_get_curve_name(group)))
1369                             == 0)
1370                                 {
1371                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1372                                 goto err;
1373                                 }
1374
1375                         /* Encode the public key.
1376                          * First check the size of encoding and
1377                          * allocate memory accordingly.
1378                          */
1379                         encodedlen = EC_POINT_point2oct(group,
1380                             EC_KEY_get0_public_key(ecdh),
1381                             POINT_CONVERSION_UNCOMPRESSED,
1382                             NULL, 0, NULL);
1383
1384                         encodedPoint = (unsigned char *)
1385                             OPENSSL_malloc(encodedlen*sizeof(unsigned char));
1386                         bn_ctx = BN_CTX_new();
1387                         if ((encodedPoint == NULL) || (bn_ctx == NULL))
1388                                 {
1389                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1390                                 goto err;
1391                                 }
1392
1393
1394                         encodedlen = EC_POINT_point2oct(group,
1395                             EC_KEY_get0_public_key(ecdh),
1396                             POINT_CONVERSION_UNCOMPRESSED,
1397                             encodedPoint, encodedlen, bn_ctx);
1398
1399                         if (encodedlen == 0)
1400                                 {
1401                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1402                                 goto err;
1403                                 }
1404
1405                         BN_CTX_free(bn_ctx);  bn_ctx=NULL;
1406
1407                         /* XXX: For now, we only support named (not
1408                          * generic) curves in ECDH ephemeral key exchanges.
1409                          * In this situation, we need four additional bytes
1410                          * to encode the entire ServerECDHParams
1411                          * structure.
1412                          */
1413                         n = 4 + encodedlen;
1414
1415                         /* We'll generate the serverKeyExchange message
1416                          * explicitly so we can set these to NULLs
1417                          */
1418                         r[0]=NULL;
1419                         r[1]=NULL;
1420                         r[2]=NULL;
1421                         r[3]=NULL;
1422                         }
1423                 else
1424 #endif /* !OPENSSL_NO_ECDH */
1425                         {
1426                         al=SSL_AD_HANDSHAKE_FAILURE;
1427                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1428                         goto f_err;
1429                         }
1430                 for (i=0; r[i] != NULL; i++)
1431                         {
1432                         nr[i]=BN_num_bytes(r[i]);
1433                         n+=2+nr[i];
1434                         }
1435
1436                 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
1437                         {
1438                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
1439                                 == NULL)
1440                                 {
1441                                 al=SSL_AD_DECODE_ERROR;
1442                                 goto f_err;
1443                                 }
1444                         kn=EVP_PKEY_size(pkey);
1445                         }
1446                 else
1447                         {
1448                         pkey=NULL;
1449                         kn=0;
1450                         }
1451
1452                 if (!BUF_MEM_grow_clean(buf,n+4+kn))
1453                         {
1454                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1455                         goto err;
1456                         }
1457                 d=(unsigned char *)s->init_buf->data;
1458                 p= &(d[4]);
1459
1460                 for (i=0; r[i] != NULL; i++)
1461                         {
1462                         s2n(nr[i],p);
1463                         BN_bn2bin(r[i],p);
1464                         p+=nr[i];
1465                         }
1466
1467 #ifndef OPENSSL_NO_ECDH
1468                 if (type & SSL_kECDHE)
1469                         {
1470                         /* XXX: For now, we only support named (not generic) curves.
1471                          * In this situation, the serverKeyExchange message has:
1472                          * [1 byte CurveType], [2 byte CurveName]
1473                          * [1 byte length of encoded point], followed by
1474                          * the actual encoded point itself
1475                          */
1476                         *p = NAMED_CURVE_TYPE;
1477                         p += 1;
1478                         *p = 0;
1479                         p += 1;
1480                         *p = curve_id;
1481                         p += 1;
1482                         *p = encodedlen;
1483                         p += 1;
1484                         memcpy((unsigned char*)p,
1485                             (unsigned char *)encodedPoint,
1486                             encodedlen);
1487                         OPENSSL_free(encodedPoint);
1488                         p += encodedlen;
1489                         }
1490 #endif
1491
1492                 /* not anonymous */
1493                 if (pkey != NULL)
1494                         {
1495                         /* n is the length of the params, they start at &(d[4])
1496                          * and p points to the space at the end. */
1497 #ifndef OPENSSL_NO_RSA
1498                         if (pkey->type == EVP_PKEY_RSA)
1499                                 {
1500                                 q=md_buf;
1501                                 j=0;
1502                                 for (num=2; num > 0; num--)
1503                                         {
1504                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1505                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1506                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1507                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1508                                         EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1509                                         EVP_DigestFinal_ex(&md_ctx,q,
1510                                                 (unsigned int *)&i);
1511                                         q+=i;
1512                                         j+=i;
1513                                         }
1514                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1515                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1516                                         {
1517                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1518                                         goto err;
1519                                         }
1520                                 s2n(u,p);
1521                                 n+=u+2;
1522                                 }
1523                         else
1524 #endif
1525 #if !defined(OPENSSL_NO_DSA)
1526                                 if (pkey->type == EVP_PKEY_DSA)
1527                                 {
1528                                 /* lets do DSS */
1529                                 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
1530                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1531                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1532                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1533                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1534                                         (unsigned int *)&i,pkey))
1535                                         {
1536                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1537                                         goto err;
1538                                         }
1539                                 s2n(i,p);
1540                                 n+=i+2;
1541                                 }
1542                         else
1543 #endif
1544 #if !defined(OPENSSL_NO_ECDSA)
1545                                 if (pkey->type == EVP_PKEY_EC)
1546                                 {
1547                                 /* let's do ECDSA */
1548                                 EVP_SignInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1549                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1550                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1551                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1552                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1553                                         (unsigned int *)&i,pkey))
1554                                         {
1555                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_ECDSA);
1556                                         goto err;
1557                                         }
1558                                 s2n(i,p);
1559                                 n+=i+2;
1560                                 }
1561                         else
1562 #endif
1563                                 {
1564                                 /* Is this error check actually needed? */
1565                                 al=SSL_AD_HANDSHAKE_FAILURE;
1566                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1567                                 goto f_err;
1568                                 }
1569                         }
1570
1571                 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
1572                 l2n3(n,d);
1573
1574                 /* we should now have things packed up, so lets send
1575                  * it off */
1576                 s->init_num=n+4;
1577                 s->init_off=0;
1578                 }
1579
1580         s->state = SSL3_ST_SW_KEY_EXCH_B;
1581         EVP_MD_CTX_cleanup(&md_ctx);
1582         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1583 f_err:
1584         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1585 err:
1586 #ifndef OPENSSL_NO_ECDH
1587         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1588         BN_CTX_free(bn_ctx);
1589 #endif
1590         EVP_MD_CTX_cleanup(&md_ctx);
1591         return(-1);
1592         }
1593
1594 int ssl3_send_certificate_request(SSL *s)
1595         {
1596         unsigned char *p,*d;
1597         int i,j,nl,off,n;
1598         STACK_OF(X509_NAME) *sk=NULL;
1599         X509_NAME *name;
1600         BUF_MEM *buf;
1601
1602         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1603                 {
1604                 buf=s->init_buf;
1605
1606                 d=p=(unsigned char *)&(buf->data[4]);
1607
1608                 /* get the list of acceptable cert types */
1609                 p++;
1610                 n=ssl3_get_req_cert_type(s,p);
1611                 d[0]=n;
1612                 p+=n;
1613                 n++;
1614
1615                 off=n;
1616                 p+=2;
1617                 n+=2;
1618
1619                 sk=SSL_get_client_CA_list(s);
1620                 nl=0;
1621                 if (sk != NULL)
1622                         {
1623                         for (i=0; i<sk_X509_NAME_num(sk); i++)
1624                                 {
1625                                 name=sk_X509_NAME_value(sk,i);
1626                                 j=i2d_X509_NAME(name,NULL);
1627                                 if (!BUF_MEM_grow_clean(buf,4+n+j+2))
1628                                         {
1629                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1630                                         goto err;
1631                                         }
1632                                 p=(unsigned char *)&(buf->data[4+n]);
1633                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1634                                         {
1635                                         s2n(j,p);
1636                                         i2d_X509_NAME(name,&p);
1637                                         n+=2+j;
1638                                         nl+=2+j;
1639                                         }
1640                                 else
1641                                         {
1642                                         d=p;
1643                                         i2d_X509_NAME(name,&p);
1644                                         j-=2; s2n(j,d); j+=2;
1645                                         n+=j;
1646                                         nl+=j;
1647                                         }
1648                                 }
1649                         }
1650                 /* else no CA names */
1651                 p=(unsigned char *)&(buf->data[4+off]);
1652                 s2n(nl,p);
1653
1654                 d=(unsigned char *)buf->data;
1655                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1656                 l2n3(n,d);
1657
1658                 /* we should now have things packed up, so lets send
1659                  * it off */
1660
1661                 s->init_num=n+4;
1662                 s->init_off=0;
1663 #ifdef NETSCAPE_HANG_BUG
1664                 p=(unsigned char *)s->init_buf->data + s->init_num;
1665
1666                 /* do the header */
1667                 *(p++)=SSL3_MT_SERVER_DONE;
1668                 *(p++)=0;
1669                 *(p++)=0;
1670                 *(p++)=0;
1671                 s->init_num += 4;
1672 #endif
1673
1674                 s->state = SSL3_ST_SW_CERT_REQ_B;
1675                 }
1676
1677         /* SSL3_ST_SW_CERT_REQ_B */
1678         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1679 err:
1680         return(-1);
1681         }
1682
1683 int ssl3_get_client_key_exchange(SSL *s)
1684         {
1685         int i,al,ok;
1686         long n;
1687         unsigned long l;
1688         unsigned char *p;
1689 #ifndef OPENSSL_NO_RSA
1690         RSA *rsa=NULL;
1691         EVP_PKEY *pkey=NULL;
1692 #endif
1693 #ifndef OPENSSL_NO_DH
1694         BIGNUM *pub=NULL;
1695         DH *dh_srvr;
1696 #endif
1697 #ifndef OPENSSL_NO_KRB5
1698         KSSL_ERR kssl_err;
1699 #endif /* OPENSSL_NO_KRB5 */
1700
1701 #ifndef OPENSSL_NO_ECDH
1702         EC_KEY *srvr_ecdh = NULL;
1703         EVP_PKEY *clnt_pub_pkey = NULL;
1704         EC_POINT *clnt_ecpoint = NULL;
1705         BN_CTX *bn_ctx = NULL;
1706 #endif
1707
1708         n=s->method->ssl_get_message(s,
1709                 SSL3_ST_SR_KEY_EXCH_A,
1710                 SSL3_ST_SR_KEY_EXCH_B,
1711                 SSL3_MT_CLIENT_KEY_EXCHANGE,
1712                 2048, /* ??? */
1713                 &ok);
1714
1715         if (!ok) return((int)n);
1716         p=(unsigned char *)s->init_msg;
1717
1718         l=s->s3->tmp.new_cipher->algorithms;
1719
1720 #ifndef OPENSSL_NO_RSA
1721         if (l & SSL_kRSA)
1722                 {
1723                 /* FIX THIS UP EAY EAY EAY EAY */
1724                 if (s->s3->tmp.use_rsa_tmp)
1725                         {
1726                         if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
1727                                 rsa=s->cert->rsa_tmp;
1728                         /* Don't do a callback because rsa_tmp should
1729                          * be sent already */
1730                         if (rsa == NULL)
1731                                 {
1732                                 al=SSL_AD_HANDSHAKE_FAILURE;
1733                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
1734                                 goto f_err;
1735
1736                                 }
1737                         }
1738                 else
1739                         {
1740                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
1741                         if (    (pkey == NULL) ||
1742                                 (pkey->type != EVP_PKEY_RSA) ||
1743                                 (pkey->pkey.rsa == NULL))
1744                                 {
1745                                 al=SSL_AD_HANDSHAKE_FAILURE;
1746                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
1747                                 goto f_err;
1748                                 }
1749                         rsa=pkey->pkey.rsa;
1750                         }
1751
1752                 /* TLS and [incidentally] DTLS, including pre-0.9.8f */
1753                 if (s->version > SSL3_VERSION &&
1754                     s->client_version != DTLS1_BAD_VER)
1755                         {
1756                         n2s(p,i);
1757                         if (n != i+2)
1758                                 {
1759                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
1760                                         {
1761                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
1762                                         goto err;
1763                                         }
1764                                 else
1765                                         p-=2;
1766                                 }
1767                         else
1768                                 n=i;
1769                         }
1770
1771                 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
1772
1773                 al = -1;
1774
1775                 if (i != SSL_MAX_MASTER_KEY_LENGTH)
1776                         {
1777                         al=SSL_AD_DECODE_ERROR;
1778                         /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT); */
1779                         }
1780
1781                 if ((al == -1) && !((p[0] == (s->client_version>>8)) && (p[1] == (s->client_version & 0xff))))
1782                         {
1783                         /* The premaster secret must contain the same version number as the
1784                          * ClientHello to detect version rollback attacks (strangely, the
1785                          * protocol does not offer such protection for DH ciphersuites).
1786                          * However, buggy clients exist that send the negotiated protocol
1787                          * version instead if the server does not support the requested
1788                          * protocol version.
1789                          * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
1790                         if (!((s->options & SSL_OP_TLS_ROLLBACK_BUG) &&
1791                                 (p[0] == (s->version>>8)) && (p[1] == (s->version & 0xff))))
1792                                 {
1793                                 al=SSL_AD_DECODE_ERROR;
1794                                 /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER); */
1795
1796                                 /* The Klima-Pokorny-Rosa extension of Bleichenbacher's attack
1797                                  * (http://eprint.iacr.org/2003/052/) exploits the version
1798                                  * number check as a "bad version oracle" -- an alert would
1799                                  * reveal that the plaintext corresponding to some ciphertext
1800                                  * made up by the adversary is properly formatted except
1801                                  * that the version number is wrong.  To avoid such attacks,
1802                                  * we should treat this just like any other decryption error. */
1803                                 }
1804                         }
1805
1806                 if (al != -1)
1807                         {
1808                         /* Some decryption failure -- use random value instead as countermeasure
1809                          * against Bleichenbacher's attack on PKCS #1 v1.5 RSA padding
1810                          * (see RFC 2246, section 7.4.7.1). */
1811                         ERR_clear_error();
1812                         i = SSL_MAX_MASTER_KEY_LENGTH;
1813                         p[0] = s->client_version >> 8;
1814                         p[1] = s->client_version & 0xff;
1815                         if (RAND_pseudo_bytes(p+2, i-2) <= 0) /* should be RAND_bytes, but we cannot work around a failure */
1816                                 goto err;
1817                         }
1818
1819                 s->session->master_key_length=
1820                         s->method->ssl3_enc->generate_master_secret(s,
1821                                 s->session->master_key,
1822                                 p,i);
1823                 OPENSSL_cleanse(p,i);
1824                 }
1825         else
1826 #endif
1827 #ifndef OPENSSL_NO_DH
1828                 if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1829                 {
1830                 n2s(p,i);
1831                 if (n != i+2)
1832                         {
1833                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
1834                                 {
1835                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
1836                                 goto err;
1837                                 }
1838                         else
1839                                 {
1840                                 p-=2;
1841                                 i=(int)n;
1842                                 }
1843                         }
1844
1845                 if (n == 0L) /* the parameters are in the cert */
1846                         {
1847                         al=SSL_AD_HANDSHAKE_FAILURE;
1848                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_DECODE_DH_CERTS);
1849                         goto f_err;
1850                         }
1851                 else
1852                         {
1853                         if (s->s3->tmp.dh == NULL)
1854                                 {
1855                                 al=SSL_AD_HANDSHAKE_FAILURE;
1856                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1857                                 goto f_err;
1858                                 }
1859                         else
1860                                 dh_srvr=s->s3->tmp.dh;
1861                         }
1862
1863                 pub=BN_bin2bn(p,i,NULL);
1864                 if (pub == NULL)
1865                         {
1866                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
1867                         goto err;
1868                         }
1869
1870                 i=DH_compute_key(p,pub,dh_srvr);
1871
1872                 if (i <= 0)
1873                         {
1874                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1875                         goto err;
1876                         }
1877
1878                 DH_free(s->s3->tmp.dh);
1879                 s->s3->tmp.dh=NULL;
1880
1881                 BN_clear_free(pub);
1882                 pub=NULL;
1883                 s->session->master_key_length=
1884                         s->method->ssl3_enc->generate_master_secret(s,
1885                                 s->session->master_key,p,i);
1886                 OPENSSL_cleanse(p,i);
1887                 }
1888         else
1889 #endif
1890 #ifndef OPENSSL_NO_KRB5
1891         if (l & SSL_kKRB5)
1892                 {
1893                 krb5_error_code         krb5rc;
1894                 krb5_data               enc_ticket;
1895                 krb5_data               authenticator;
1896                 krb5_data               enc_pms;
1897                 KSSL_CTX                *kssl_ctx = s->kssl_ctx;
1898                 EVP_CIPHER_CTX          ciph_ctx;
1899                 EVP_CIPHER              *enc = NULL;
1900                 unsigned char           iv[EVP_MAX_IV_LENGTH];
1901                 unsigned char           pms[SSL_MAX_MASTER_KEY_LENGTH
1902                                                + EVP_MAX_BLOCK_LENGTH];
1903                 int                     padl, outl;
1904                 krb5_timestamp          authtime = 0;
1905                 krb5_ticket_times       ttimes;
1906
1907                 EVP_CIPHER_CTX_init(&ciph_ctx);
1908
1909                 if (!kssl_ctx)  kssl_ctx = kssl_ctx_new();
1910
1911                 n2s(p,i);
1912                 enc_ticket.length = i;
1913
1914                 if (n < (int)enc_ticket.length + 6)
1915                         {
1916                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1917                                 SSL_R_DATA_LENGTH_TOO_LONG);
1918                         goto err;
1919                         }
1920
1921                 enc_ticket.data = (char *)p;
1922                 p+=enc_ticket.length;
1923
1924                 n2s(p,i);
1925                 authenticator.length = i;
1926
1927                 if (n < (int)(enc_ticket.length + authenticator.length) + 6)
1928                         {
1929                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1930                                 SSL_R_DATA_LENGTH_TOO_LONG);
1931                         goto err;
1932                         }
1933
1934                 authenticator.data = (char *)p;
1935                 p+=authenticator.length;
1936
1937                 n2s(p,i);
1938                 enc_pms.length = i;
1939                 enc_pms.data = (char *)p;
1940                 p+=enc_pms.length;
1941
1942                 /* Note that the length is checked again below,
1943                 ** after decryption
1944                 */
1945                 if(enc_pms.length > sizeof pms)
1946                         {
1947                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1948                                SSL_R_DATA_LENGTH_TOO_LONG);
1949                         goto err;
1950                         }
1951
1952                 if (n != (long)(enc_ticket.length + authenticator.length +
1953                                                 enc_pms.length + 6))
1954                         {
1955                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1956                                 SSL_R_DATA_LENGTH_TOO_LONG);
1957                         goto err;
1958                         }
1959
1960                 if ((krb5rc = kssl_sget_tkt(kssl_ctx, &enc_ticket, &ttimes,
1961                                         &kssl_err)) != 0)
1962                         {
1963 #ifdef KSSL_DEBUG
1964                         printf("kssl_sget_tkt rtn %d [%d]\n",
1965                                 krb5rc, kssl_err.reason);
1966                         if (kssl_err.text)
1967                                 printf("kssl_err text= %s\n", kssl_err.text);
1968 #endif  /* KSSL_DEBUG */
1969                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1970                                 kssl_err.reason);
1971                         goto err;
1972                         }
1973
1974                 /*  Note: no authenticator is not considered an error,
1975                 **  but will return authtime == 0.
1976                 */
1977                 if ((krb5rc = kssl_check_authent(kssl_ctx, &authenticator,
1978                                         &authtime, &kssl_err)) != 0)
1979                         {
1980 #ifdef KSSL_DEBUG
1981                         printf("kssl_check_authent rtn %d [%d]\n",
1982                                 krb5rc, kssl_err.reason);
1983                         if (kssl_err.text)
1984                                 printf("kssl_err text= %s\n", kssl_err.text);
1985 #endif  /* KSSL_DEBUG */
1986                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1987                                 kssl_err.reason);
1988                         goto err;
1989                         }
1990
1991                 if ((krb5rc = kssl_validate_times(authtime, &ttimes)) != 0)
1992                         {
1993                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, krb5rc);
1994                         goto err;
1995                         }
1996
1997 #ifdef KSSL_DEBUG
1998                 kssl_ctx_show(kssl_ctx);
1999 #endif  /* KSSL_DEBUG */
2000
2001                 enc = kssl_map_enc(kssl_ctx->enctype);
2002                 if (enc == NULL)
2003                     goto err;
2004
2005                 memset(iv, 0, sizeof iv);       /* per RFC 1510 */
2006
2007                 if (!EVP_DecryptInit_ex(&ciph_ctx,enc,NULL,kssl_ctx->key,iv))
2008                         {
2009                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2010                                 SSL_R_DECRYPTION_FAILED);
2011                         goto err;
2012                         }
2013                 if (!EVP_DecryptUpdate(&ciph_ctx, pms,&outl,
2014                                         (unsigned char *)enc_pms.data, enc_pms.length))
2015                         {
2016                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2017                                 SSL_R_DECRYPTION_FAILED);
2018                         goto err;
2019                         }
2020                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2021                         {
2022                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2023                                 SSL_R_DATA_LENGTH_TOO_LONG);
2024                         goto err;
2025                         }
2026                 if (!EVP_DecryptFinal_ex(&ciph_ctx,&(pms[outl]),&padl))
2027                         {
2028                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2029                                 SSL_R_DECRYPTION_FAILED);
2030                         goto err;
2031                         }
2032                 outl += padl;
2033                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2034                         {
2035                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2036                                 SSL_R_DATA_LENGTH_TOO_LONG);
2037                         goto err;
2038                         }
2039                 if (!((pms[0] == (s->client_version>>8)) && (pms[1] == (s->client_version & 0xff))))
2040                     {
2041                     /* The premaster secret must contain the same version number as the
2042                      * ClientHello to detect version rollback attacks (strangely, the
2043                      * protocol does not offer such protection for DH ciphersuites).
2044                      * However, buggy clients exist that send random bytes instead of
2045                      * the protocol version.
2046                      * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients.
2047                      * (Perhaps we should have a separate BUG value for the Kerberos cipher)
2048                      */
2049                     if (!(s->options & SSL_OP_TLS_ROLLBACK_BUG))
2050                         {
2051                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2052                                SSL_AD_DECODE_ERROR);
2053                         goto err;
2054                         }
2055                     }
2056
2057                 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2058
2059                 s->session->master_key_length=
2060                         s->method->ssl3_enc->generate_master_secret(s,
2061                                 s->session->master_key, pms, outl);
2062
2063                 if (kssl_ctx->client_princ)
2064                         {
2065                         size_t len = strlen(kssl_ctx->client_princ);
2066                         if ( len < SSL_MAX_KRB5_PRINCIPAL_LENGTH )
2067                                 {
2068                                 s->session->krb5_client_princ_len = len;
2069                                 memcpy(s->session->krb5_client_princ,kssl_ctx->client_princ,len);
2070                                 }
2071                         }
2072
2073
2074                 /*  Was doing kssl_ctx_free() here,
2075                 **  but it caused problems for apache.
2076                 **  kssl_ctx = kssl_ctx_free(kssl_ctx);
2077                 **  if (s->kssl_ctx)  s->kssl_ctx = NULL;
2078                 */
2079                 }
2080         else
2081 #endif  /* OPENSSL_NO_KRB5 */
2082
2083 #ifndef OPENSSL_NO_ECDH
2084                 if ((l & SSL_kECDH) || (l & SSL_kECDHE))
2085                 {
2086                 int ret = 1;
2087                 int field_size = 0;
2088                 const EC_KEY   *tkey;
2089                 const EC_GROUP *group;
2090                 const BIGNUM *priv_key;
2091
2092                 /* initialize structures for server's ECDH key pair */
2093                 if ((srvr_ecdh = EC_KEY_new()) == NULL)
2094                         {
2095                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2096                             ERR_R_MALLOC_FAILURE);
2097                         goto err;
2098                         }
2099
2100                 /* Let's get server private key and group information */
2101                 if (l & SSL_kECDH)
2102                         {
2103                         /* use the certificate */
2104                         tkey = s->cert->pkeys[SSL_PKEY_ECC].privatekey->pkey.ec;
2105                         }
2106                 else
2107                         {
2108                         /* use the ephermeral values we saved when
2109                          * generating the ServerKeyExchange msg.
2110                          */
2111                         tkey = s->s3->tmp.ecdh;
2112                         }
2113
2114                 group    = EC_KEY_get0_group(tkey);
2115                 priv_key = EC_KEY_get0_private_key(tkey);
2116
2117                 if (!EC_KEY_set_group(srvr_ecdh, group) ||
2118                     !EC_KEY_set_private_key(srvr_ecdh, priv_key))
2119                         {
2120                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2121                                ERR_R_EC_LIB);
2122                         goto err;
2123                         }
2124
2125                 /* Let's get client's public key */
2126                 if ((clnt_ecpoint = EC_POINT_new(group)) == NULL)
2127                         {
2128                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2129                             ERR_R_MALLOC_FAILURE);
2130                         goto err;
2131                         }
2132
2133                 if (n == 0L)
2134                         {
2135                         /* Client Publickey was in Client Certificate */
2136
2137                          if (l & SSL_kECDHE)
2138                                  {
2139                                  al=SSL_AD_HANDSHAKE_FAILURE;
2140                                  SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
2141                                  goto f_err;
2142                                  }
2143                         if (((clnt_pub_pkey=X509_get_pubkey(s->session->peer))
2144                             == NULL) ||
2145                             (clnt_pub_pkey->type != EVP_PKEY_EC))
2146                                 {
2147                                 /* XXX: For now, we do not support client
2148                                  * authentication using ECDH certificates
2149                                  * so this branch (n == 0L) of the code is
2150                                  * never executed. When that support is
2151                                  * added, we ought to ensure the key
2152                                  * received in the certificate is
2153                                  * authorized for key agreement.
2154                                  * ECDH_compute_key implicitly checks that
2155                                  * the two ECDH shares are for the same
2156                                  * group.
2157                                  */
2158                                 al=SSL_AD_HANDSHAKE_FAILURE;
2159                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2160                                     SSL_R_UNABLE_TO_DECODE_ECDH_CERTS);
2161                                 goto f_err;
2162                                 }
2163
2164                         if (EC_POINT_copy(clnt_ecpoint,
2165                             EC_KEY_get0_public_key(clnt_pub_pkey->pkey.ec)) == 0)
2166                                 {
2167                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2168                                         ERR_R_EC_LIB);
2169                                 goto err;
2170                                 }
2171                         ret = 2; /* Skip certificate verify processing */
2172                         }
2173                 else
2174                         {
2175                         /* Get client's public key from encoded point
2176                          * in the ClientKeyExchange message.
2177                          */
2178                         if ((bn_ctx = BN_CTX_new()) == NULL)
2179                                 {
2180                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2181                                     ERR_R_MALLOC_FAILURE);
2182                                 goto err;
2183                                 }
2184
2185                         /* Get encoded point length */
2186                         i = *p;
2187                         p += 1;
2188                         if (EC_POINT_oct2point(group,
2189                             clnt_ecpoint, p, i, bn_ctx) == 0)
2190                                 {
2191                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2192                                     ERR_R_EC_LIB);
2193                                 goto err;
2194                                 }
2195                         /* p is pointing to somewhere in the buffer
2196                          * currently, so set it to the start
2197                          */
2198                         p=(unsigned char *)s->init_buf->data;
2199                         }
2200
2201                 /* Compute the shared pre-master secret */
2202                 field_size = EC_GROUP_get_degree(group);
2203                 if (field_size <= 0)
2204                         {
2205                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2206                                ERR_R_ECDH_LIB);
2207                         goto err;
2208                         }
2209                 i = ECDH_compute_key(p, (field_size+7)/8, clnt_ecpoint, srvr_ecdh, NULL);
2210                 if (i <= 0)
2211                         {
2212                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2213                             ERR_R_ECDH_LIB);
2214                         goto err;
2215                         }
2216
2217                 EVP_PKEY_free(clnt_pub_pkey);
2218                 EC_POINT_free(clnt_ecpoint);
2219                 if (srvr_ecdh != NULL)
2220                         EC_KEY_free(srvr_ecdh);
2221                 BN_CTX_free(bn_ctx);
2222
2223                 /* Compute the master secret */
2224                 s->session->master_key_length = s->method->ssl3_enc-> \
2225                     generate_master_secret(s, s->session->master_key, p, i);
2226
2227                 OPENSSL_cleanse(p, i);
2228                 return (ret);
2229                 }
2230         else
2231 #endif
2232                 {
2233                 al=SSL_AD_HANDSHAKE_FAILURE;
2234                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2235                                 SSL_R_UNKNOWN_CIPHER_TYPE);
2236                 goto f_err;
2237                 }
2238
2239         return(1);
2240 f_err:
2241         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2242 #if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA) || !defined(OPENSSL_NO_ECDH)
2243 err:
2244 #endif
2245 #ifndef OPENSSL_NO_ECDH
2246         EVP_PKEY_free(clnt_pub_pkey);
2247         EC_POINT_free(clnt_ecpoint);
2248         if (srvr_ecdh != NULL)
2249                 EC_KEY_free(srvr_ecdh);
2250         BN_CTX_free(bn_ctx);
2251 #endif
2252         return(-1);
2253         }
2254
2255 int ssl3_get_cert_verify(SSL *s)
2256         {
2257         EVP_PKEY *pkey=NULL;
2258         unsigned char *p;
2259         int al,ok,ret=0;
2260         long n;
2261         int type=0,i,j;
2262         X509 *peer;
2263
2264         n=s->method->ssl_get_message(s,
2265                 SSL3_ST_SR_CERT_VRFY_A,
2266                 SSL3_ST_SR_CERT_VRFY_B,
2267                 -1,
2268                 514, /* 514? */
2269                 &ok);
2270
2271         if (!ok) return((int)n);
2272
2273         if (s->session->peer != NULL)
2274                 {
2275                 peer=s->session->peer;
2276                 pkey=X509_get_pubkey(peer);
2277                 type=X509_certificate_type(peer,pkey);
2278                 }
2279         else
2280                 {
2281                 peer=NULL;
2282                 pkey=NULL;
2283                 }
2284
2285         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
2286                 {
2287                 s->s3->tmp.reuse_message=1;
2288                 if ((peer != NULL) && (type | EVP_PKT_SIGN))
2289                         {
2290                         al=SSL_AD_UNEXPECTED_MESSAGE;
2291                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
2292                         goto f_err;
2293                         }
2294                 ret=1;
2295                 goto end;
2296                 }
2297
2298         if (peer == NULL)
2299                 {
2300                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
2301                 al=SSL_AD_UNEXPECTED_MESSAGE;
2302                 goto f_err;
2303                 }
2304
2305         if (!(type & EVP_PKT_SIGN))
2306                 {
2307                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
2308                 al=SSL_AD_ILLEGAL_PARAMETER;
2309                 goto f_err;
2310                 }
2311
2312         if (s->s3->change_cipher_spec)
2313                 {
2314                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
2315                 al=SSL_AD_UNEXPECTED_MESSAGE;
2316                 goto f_err;
2317                 }
2318
2319         /* we now have a signature that we need to verify */
2320         p=(unsigned char *)s->init_msg;
2321         n2s(p,i);
2322         n-=2;
2323         if (i > n)
2324                 {
2325                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
2326                 al=SSL_AD_DECODE_ERROR;
2327                 goto f_err;
2328                 }
2329
2330         j=EVP_PKEY_size(pkey);
2331         if ((i > j) || (n > j) || (n <= 0))
2332                 {
2333                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
2334                 al=SSL_AD_DECODE_ERROR;
2335                 goto f_err;
2336                 }
2337
2338 #ifndef OPENSSL_NO_RSA
2339         if (pkey->type == EVP_PKEY_RSA)
2340                 {
2341                 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
2342                         MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i,
2343                                                         pkey->pkey.rsa);
2344                 if (i < 0)
2345                         {
2346                         al=SSL_AD_DECRYPT_ERROR;
2347                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
2348                         goto f_err;
2349                         }
2350                 if (i == 0)
2351                         {
2352                         al=SSL_AD_DECRYPT_ERROR;
2353                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
2354                         goto f_err;
2355                         }
2356                 }
2357         else
2358 #endif
2359 #ifndef OPENSSL_NO_DSA
2360                 if (pkey->type == EVP_PKEY_DSA)
2361                 {
2362                 j=DSA_verify(pkey->save_type,
2363                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
2364                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
2365                 if (j <= 0)
2366                         {
2367                         /* bad signature */
2368                         al=SSL_AD_DECRYPT_ERROR;
2369                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
2370                         goto f_err;
2371                         }
2372                 }
2373         else
2374 #endif
2375 #ifndef OPENSSL_NO_ECDSA
2376                 if (pkey->type == EVP_PKEY_EC)
2377                 {
2378                 j=ECDSA_verify(pkey->save_type,
2379                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
2380                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.ec);
2381                 if (j <= 0)
2382                         {
2383                         /* bad signature */
2384                         al=SSL_AD_DECRYPT_ERROR;
2385                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
2386                             SSL_R_BAD_ECDSA_SIGNATURE);
2387                         goto f_err;
2388                         }
2389                 }
2390         else
2391 #endif
2392                 {
2393                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
2394                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
2395                 goto f_err;
2396                 }
2397
2398
2399         ret=1;
2400         if (0)
2401                 {
2402 f_err:
2403                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2404                 }
2405 end:
2406         EVP_PKEY_free(pkey);
2407         return(ret);
2408         }
2409
2410 int ssl3_get_client_certificate(SSL *s)
2411         {
2412         int i,ok,al,ret= -1;
2413         X509 *x=NULL;
2414         unsigned long l,nc,llen,n;
2415         const unsigned char *p,*q;
2416         unsigned char *d;
2417         STACK_OF(X509) *sk=NULL;
2418
2419         n=s->method->ssl_get_message(s,
2420                 SSL3_ST_SR_CERT_A,
2421                 SSL3_ST_SR_CERT_B,
2422                 -1,
2423                 s->max_cert_list,
2424                 &ok);
2425
2426         if (!ok) return((int)n);
2427
2428         if      (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
2429                 {
2430                 if (    (s->verify_mode & SSL_VERIFY_PEER) &&
2431                         (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
2432                         {
2433                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
2434                         al=SSL_AD_HANDSHAKE_FAILURE;
2435                         goto f_err;
2436                         }
2437                 /* If tls asked for a client cert, the client must return a 0 list */
2438                 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
2439                         {
2440                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
2441                         al=SSL_AD_UNEXPECTED_MESSAGE;
2442                         goto f_err;
2443                         }
2444                 s->s3->tmp.reuse_message=1;
2445                 return(1);
2446                 }
2447
2448         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
2449                 {
2450                 al=SSL_AD_UNEXPECTED_MESSAGE;
2451                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
2452                 goto f_err;
2453                 }
2454         p=d=(unsigned char *)s->init_msg;
2455
2456         if ((sk=sk_X509_new_null()) == NULL)
2457                 {
2458                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
2459                 goto err;
2460                 }
2461
2462         n2l3(p,llen);
2463         if (llen+3 != n)
2464                 {
2465                 al=SSL_AD_DECODE_ERROR;
2466                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
2467                 goto f_err;
2468                 }
2469         for (nc=0; nc<llen; )
2470                 {
2471                 n2l3(p,l);
2472                 if ((l+nc+3) > llen)
2473                         {
2474                         al=SSL_AD_DECODE_ERROR;
2475                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
2476                         goto f_err;
2477                         }
2478
2479                 q=p;
2480                 x=d2i_X509(NULL,&p,l);
2481                 if (x == NULL)
2482                         {
2483                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
2484                         goto err;
2485                         }
2486                 if (p != (q+l))
2487                         {
2488                         al=SSL_AD_DECODE_ERROR;
2489                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
2490                         goto f_err;
2491                         }
2492                 if (!sk_X509_push(sk,x))
2493                         {
2494                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
2495                         goto err;
2496                         }
2497                 x=NULL;
2498                 nc+=l+3;
2499                 }
2500
2501         if (sk_X509_num(sk) <= 0)
2502                 {
2503                 /* TLS does not mind 0 certs returned */
2504                 if (s->version == SSL3_VERSION)
2505                         {
2506                         al=SSL_AD_HANDSHAKE_FAILURE;
2507                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
2508                         goto f_err;
2509                         }
2510                 /* Fail for TLS only if we required a certificate */
2511                 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
2512                          (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
2513                         {
2514                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
2515                         al=SSL_AD_HANDSHAKE_FAILURE;
2516                         goto f_err;
2517                         }
2518                 }
2519         else
2520                 {
2521                 i=ssl_verify_cert_chain(s,sk);
2522                 if (!i)
2523                         {
2524                         al=ssl_verify_alarm_type(s->verify_result);
2525                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED);
2526                         goto f_err;
2527                         }
2528                 }
2529
2530         if (s->session->peer != NULL) /* This should not be needed */
2531                 X509_free(s->session->peer);
2532         s->session->peer=sk_X509_shift(sk);
2533         s->session->verify_result = s->verify_result;
2534
2535         /* With the current implementation, sess_cert will always be NULL
2536          * when we arrive here. */
2537         if (s->session->sess_cert == NULL)
2538                 {
2539                 s->session->sess_cert = ssl_sess_cert_new();
2540                 if (s->session->sess_cert == NULL)
2541                         {
2542                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
2543                         goto err;
2544                         }
2545                 }
2546         if (s->session->sess_cert->cert_chain != NULL)
2547                 sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free);
2548         s->session->sess_cert->cert_chain=sk;
2549         /* Inconsistency alert: cert_chain does *not* include the
2550          * peer's own certificate, while we do include it in s3_clnt.c */
2551
2552         sk=NULL;
2553
2554         ret=1;
2555         if (0)
2556                 {
2557 f_err:
2558                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2559                 }
2560 err:
2561         if (x != NULL) X509_free(x);
2562         if (sk != NULL) sk_X509_pop_free(sk,X509_free);
2563         return(ret);
2564         }
2565
2566 int ssl3_send_server_certificate(SSL *s)
2567         {
2568         unsigned long l;
2569         X509 *x;
2570
2571         if (s->state == SSL3_ST_SW_CERT_A)
2572                 {
2573                 x=ssl_get_server_send_cert(s);
2574                 if (x == NULL &&
2575                         /* VRS: allow null cert if auth == KRB5 */
2576                         (s->s3->tmp.new_cipher->algorithms
2577                                 & (SSL_MKEY_MASK|SSL_AUTH_MASK))
2578                         != (SSL_aKRB5|SSL_kKRB5))
2579                         {
2580                         SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
2581                         return(0);
2582                         }
2583
2584                 l=ssl3_output_cert_chain(s,x);
2585                 s->state=SSL3_ST_SW_CERT_B;
2586                 s->init_num=(int)l;
2587                 s->init_off=0;
2588                 }
2589
2590         /* SSL3_ST_SW_CERT_B */
2591         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2592         }
2593
2594
2595 #ifndef OPENSSL_NO_ECDH
2596 /* This is the complement of curve_id2nid in s3_clnt.c. */
2597 static int nid2curve_id(int nid)
2598 {
2599         /* ECC curves from draft-ietf-tls-ecc-01.txt (Mar 15, 2001)
2600          * (no changes in draft-ietf-tls-ecc-03.txt [June 2003]) */
2601         switch (nid) {
2602         case NID_sect163k1: /* sect163k1 (1) */
2603                 return 1;
2604         case NID_sect163r1: /* sect163r1 (2) */
2605                 return 2;
2606         case NID_sect163r2: /* sect163r2 (3) */
2607                 return 3;
2608         case NID_sect193r1: /* sect193r1 (4) */
2609                 return 4;
2610         case NID_sect193r2: /* sect193r2 (5) */
2611                 return 5;
2612         case NID_sect233k1: /* sect233k1 (6) */
2613                 return 6;
2614         case NID_sect233r1: /* sect233r1 (7) */
2615                 return 7;
2616         case NID_sect239k1: /* sect239k1 (8) */
2617                 return 8;
2618         case NID_sect283k1: /* sect283k1 (9) */
2619                 return 9;
2620         case NID_sect283r1: /* sect283r1 (10) */
2621                 return 10;
2622         case NID_sect409k1: /* sect409k1 (11) */
2623                 return 11;
2624         case NID_sect409r1: /* sect409r1 (12) */
2625                 return 12;
2626         case NID_sect571k1: /* sect571k1 (13) */
2627                 return 13;
2628         case NID_sect571r1: /* sect571r1 (14) */
2629                 return 14;
2630         case NID_secp160k1: /* secp160k1 (15) */
2631                 return 15;
2632         case NID_secp160r1: /* secp160r1 (16) */
2633                 return 16;
2634         case NID_secp160r2: /* secp160r2 (17) */
2635                 return 17;
2636         case NID_secp192k1: /* secp192k1 (18) */
2637                 return 18;
2638         case NID_X9_62_prime192v1: /* secp192r1 (19) */
2639                 return 19;
2640         case NID_secp224k1: /* secp224k1 (20) */
2641                 return 20;
2642         case NID_secp224r1: /* secp224r1 (21) */
2643                 return 21;
2644         case NID_secp256k1: /* secp256k1 (22) */
2645                 return 22;
2646         case NID_X9_62_prime256v1: /* secp256r1 (23) */
2647                 return 23;
2648         case NID_secp384r1: /* secp384r1 (24) */
2649                 return 24;
2650         case NID_secp521r1:  /* secp521r1 (25) */
2651                 return 25;
2652         default:
2653                 return 0;
2654         }
2655 }
2656 #endif
2657 #ifndef OPENSSL_NO_TLSEXT
2658 int ssl3_send_newsession_ticket(SSL *s)
2659         {
2660         if (s->state == SSL3_ST_SW_SESSION_TICKET_A)
2661                 {
2662                 unsigned char *p, *senc, *macstart;
2663                 int len, slen;
2664                 unsigned int hlen;
2665                 EVP_CIPHER_CTX ctx;
2666                 HMAC_CTX hctx;
2667
2668                 /* get session encoding length */
2669                 slen = i2d_SSL_SESSION(s->session, NULL);
2670                 /* Some length values are 16 bits, so forget it if session is
2671                  * too long
2672                  */
2673                 if (slen > 0xFF00)
2674                         return -1;
2675                 /* Grow buffer if need be: the length calculation is as
2676                  * follows 1 (size of message name) + 3 (message length
2677                  * bytes) + 4 (ticket lifetime hint) + 2 (ticket length) +
2678                  * 16 (key name) + max_iv_len (iv length) +
2679                  * session_length + max_enc_block_size (max encrypted session
2680                  * length) + max_md_size (HMAC).
2681                  */
2682                 if (!BUF_MEM_grow(s->init_buf,
2683                         26 + EVP_MAX_IV_LENGTH + EVP_MAX_BLOCK_LENGTH +
2684                         EVP_MAX_MD_SIZE + slen))
2685                         return -1;
2686                 senc = OPENSSL_malloc(slen);
2687                 if (!senc)
2688                         return -1;
2689                 p = senc;
2690                 i2d_SSL_SESSION(s->session, &p);
2691
2692                 p=(unsigned char *)s->init_buf->data;
2693                 /* do the header */
2694                 *(p++)=SSL3_MT_NEWSESSION_TICKET;
2695                 /* Skip message length for now */
2696                 p += 3;
2697                 l2n(s->session->tlsext_tick_lifetime_hint, p);
2698                 /* Skip ticket length for now */
2699                 p += 2;
2700                 /* Output key name */
2701                 macstart = p;
2702                 memcpy(p, s->ctx->tlsext_tick_key_name, 16);
2703                 p += 16;
2704                 /* Generate and output IV */
2705                 RAND_pseudo_bytes(p, 16);
2706                 EVP_CIPHER_CTX_init(&ctx);
2707                 /* Encrypt session data */
2708                 EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
2709                                         s->ctx->tlsext_tick_aes_key, p);
2710                 p += 16;
2711                 EVP_EncryptUpdate(&ctx, p, &len, senc, slen);
2712                 p += len;
2713                 EVP_EncryptFinal(&ctx, p, &len);
2714                 p += len;
2715                 EVP_CIPHER_CTX_cleanup(&ctx);
2716
2717                 HMAC_CTX_init(&hctx);
2718                 HMAC_Init_ex(&hctx, s->ctx->tlsext_tick_hmac_key, 16,
2719                                 tlsext_tick_md(), NULL);
2720                 HMAC_Update(&hctx, macstart, p - macstart);
2721                 HMAC_Final(&hctx, p, &hlen);
2722                 HMAC_CTX_cleanup(&hctx);
2723
2724                 p += hlen;
2725                 /* Now write out lengths: p points to end of data written */
2726                 /* Total length */
2727                 len = p - (unsigned char *)s->init_buf->data;
2728                 p=(unsigned char *)s->init_buf->data + 1;
2729                 l2n3(len - 4, p); /* Message length */
2730                 p += 4;
2731                 s2n(len - 10, p);  /* Ticket length */
2732
2733                 /* number of bytes to write */
2734                 s->init_num= len;
2735                 s->state=SSL3_ST_SW_SESSION_TICKET_B;
2736                 s->init_off=0;
2737                 OPENSSL_free(senc);
2738                 }
2739
2740         /* SSL3_ST_SW_SESSION_TICKET_B */
2741         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2742         }
2743 #endif