ssl/s3_srvr.c

   1 /* ssl/s3_srvr.c -*- mode:C; c-file-style: "eay" -*- */
   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) 1998-2007 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  * Copyright 2005 Nokia. All rights reserved.
 126  *
 127  * The portions of the attached software ("Contribution") is developed by
 128  * Nokia Corporation and is licensed pursuant to the OpenSSL open source
 129  * license.
 130  *
 131  * The Contribution, originally written by Mika Kousa and Pasi Eronen of
 132  * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
 133  * support (see RFC 4279) to OpenSSL.
 134  *
 135  * No patent licenses or other rights except those expressly stated in
 136  * the OpenSSL open source license shall be deemed granted or received
 137  * expressly, by implication, estoppel, or otherwise.
 138  *
 139  * No assurances are provided by Nokia that the Contribution does not
 140  * infringe the patent or other intellectual property rights of any third
 141  * party or that the license provides you with all the necessary rights
 142  * to make use of the Contribution.
 143  *
 144  * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
 145  * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
 146  * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
 147  * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
 148  * OTHERWISE.
 149  */
 150
 151 #define REUSE_CIPHER_BUG
 152 #define NETSCAPE_HANG_BUG
 153
 154 #include <stdio.h>
 155 #include "ssl_locl.h"
 156 #include "kssl_lcl.h"
 157 #include <openssl/buffer.h>
 158 #include <openssl/rand.h>
 159 #include <openssl/objects.h>
 160 #include <openssl/evp.h>
 161 #include <openssl/hmac.h>
 162 #include <openssl/x509.h>
 163 #ifndef OPENSSL_NO_DH
 164 #include <openssl/dh.h>
 165 #endif
 166 #include <openssl/bn.h>
 167 #ifndef OPENSSL_NO_KRB5
 168 #include <openssl/krb5_asn.h>
 169 #endif
 170 #include <openssl/md5.h>
 171
 172 static const SSL_METHOD *ssl3_get_server_method(int ver);
 173
 174 static const SSL_METHOD *ssl3_get_server_method(int ver)
 175         {
 176         if (ver == SSL3_VERSION)
 177                 return(SSLv3_server_method());
 178         else
 179                 return(NULL);
 180         }
 181
 182 IMPLEMENT_ssl3_meth_func(SSLv3_server_method,
 183                         ssl3_accept,
 184                         ssl_undefined_function,
 185                         ssl3_get_server_method)
 186
 187 int ssl3_accept(SSL *s)
 188         {
 189         BUF_MEM *buf;
 190         unsigned long alg_k,Time=(unsigned long)time(NULL);
 191         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 192         long num1;
 193         int ret= -1;
 194         int new_state,state,skip=0;
 195
 196         RAND_add(&Time,sizeof(Time),0);
 197         ERR_clear_error();
 198         clear_sys_error();
 199
 200         if (s->info_callback != NULL)
 201                 cb=s->info_callback;
 202         else if (s->ctx->info_callback != NULL)
 203                 cb=s->ctx->info_callback;
 204
 205         /* init things to blank */
 206         s->in_handshake++;
 207         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 208
 209         if (s->cert == NULL)
 210                 {
 211                 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
 212                 return(-1);
 213                 }
 214
 215         for (;;)
 216                 {
 217                 state=s->state;
 218
 219                 switch (s->state)
 220                         {
 221                 case SSL_ST_RENEGOTIATE:
 222                         s->new_session=1;
 223                         /* s->state=SSL_ST_ACCEPT; */
 224
 225                 case SSL_ST_BEFORE:
 226                 case SSL_ST_ACCEPT:
 227                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 228                 case SSL_ST_OK|SSL_ST_ACCEPT:
 229
 230                         s->server=1;
 231                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 232
 233                         if ((s->version>>8) != 3)
 234                                 {
 235                                 SSLerr(SSL_F_SSL3_ACCEPT, ERR_R_INTERNAL_ERROR);
 236                                 return -1;
 237                                 }
 238                         s->type=SSL_ST_ACCEPT;
 239
 240                         if (s->init_buf == NULL)
 241                                 {
 242                                 if ((buf=BUF_MEM_new()) == NULL)
 243                                         {
 244                                         ret= -1;
 245                                         goto end;
 246                                         }
 247                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 248                                         {
 249                                         ret= -1;
 250                                         goto end;
 251                                         }
 252                                 s->init_buf=buf;
 253                                 }
 254
 255                         if (!ssl3_setup_buffers(s))
 256                                 {
 257                                 ret= -1;
 258                                 goto end;
 259                                 }
 260
 261                         s->init_num=0;
 262
 263                         if (s->state != SSL_ST_RENEGOTIATE)
 264                                 {
 265                                 /* Ok, we now need to push on a buffering BIO so that
 266                                  * the output is sent in a way that TCP likes :-)
 267                                  */
 268                                 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
 269
 270                                 ssl3_init_finished_mac(s);
 271                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
 272                                 s->ctx->stats.sess_accept++;
 273                                 }
 274                         else
 275                                 {
 276                                 /* s->state == SSL_ST_RENEGOTIATE,
 277                                  * we will just send a HelloRequest */
 278                                 s->ctx->stats.sess_accept_renegotiate++;
 279                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
 280                                 }
 281                         break;
 282
 283                 case SSL3_ST_SW_HELLO_REQ_A:
 284                 case SSL3_ST_SW_HELLO_REQ_B:
 285
 286                         s->shutdown=0;
 287                         ret=ssl3_send_hello_request(s);
 288                         if (ret <= 0) goto end;
 289                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
 290                         s->state=SSL3_ST_SW_FLUSH;
 291                         s->init_num=0;
 292
 293                         ssl3_init_finished_mac(s);
 294                         break;
 295
 296                 case SSL3_ST_SW_HELLO_REQ_C:
 297                         s->state=SSL_ST_OK;
 298                         break;
 299
 300                 case SSL3_ST_SR_CLNT_HELLO_A:
 301                 case SSL3_ST_SR_CLNT_HELLO_B:
 302                 case SSL3_ST_SR_CLNT_HELLO_C:
 303
 304                         s->shutdown=0;
 305                         ret=ssl3_get_client_hello(s);
 306                         if (ret <= 0) goto end;
 307
 308                         s->new_session = 2;
 309                         s->state=SSL3_ST_SW_SRVR_HELLO_A;
 310                         s->init_num=0;
 311                         break;
 312
 313                 case SSL3_ST_SW_SRVR_HELLO_A:
 314                 case SSL3_ST_SW_SRVR_HELLO_B:
 315                         ret=ssl3_send_server_hello(s);
 316                         if (ret <= 0) goto end;
 317 #ifndef OPENSSL_NO_TLSEXT
 318                         if (s->hit)
 319                                 {
 320                                 if (s->tlsext_ticket_expected)
 321                                         s->state=SSL3_ST_SW_SESSION_TICKET_A;
 322                                 else
 323                                         s->state=SSL3_ST_SW_CHANGE_A;
 324                                 }
 325 #else
 326                         if (s->hit)
 327                                         s->state=SSL3_ST_SW_CHANGE_A;
 328 #endif
 329                         else
 330                                 s->state=SSL3_ST_SW_CERT_A;
 331                         s->init_num=0;
 332                         break;
 333
 334                 case SSL3_ST_SW_CERT_A:
 335                 case SSL3_ST_SW_CERT_B:
 336                         /* Check if it is anon DH or anon ECDH, */
 337                         /* normal PSK or KRB5 */
 338                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
 339                                 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)
 340                                 && !(s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
 341                                 {
 342                                 ret=ssl3_send_server_certificate(s);
 343                                 if (ret <= 0) goto end;
 344 #ifndef OPENSSL_NO_TLSEXT
 345                                 if (s->tlsext_status_expected)
 346                                         s->state=SSL3_ST_SW_CERT_STATUS_A;
 347                                 else
 348                                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 349                                 }
 350                         else
 351                                 {
 352                                 skip = 1;
 353                                 s->state=SSL3_ST_SW_KEY_EXCH_A;
 354                                 }
 355 #else
 356                                 }
 357                         else
 358                                 skip=1;
 359
 360                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 361 #endif
 362                         s->init_num=0;
 363                         break;
 364
 365                 case SSL3_ST_SW_KEY_EXCH_A:
 366                 case SSL3_ST_SW_KEY_EXCH_B:
 367                         alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
 368
 369                         /* clear this, it may get reset by
 370                          * send_server_key_exchange */
 371                         if ((s->options & SSL_OP_EPHEMERAL_RSA)
 372 #ifndef OPENSSL_NO_KRB5
 373                                 && !(alg_k & SSL_kKRB5)
 374 #endif /* OPENSSL_NO_KRB5 */
 375                                 )
 376                                 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
 377                                  * even when forbidden by protocol specs
 378                                  * (handshake may fail as clients are not required to
 379                                  * be able to handle this) */
 380                                 s->s3->tmp.use_rsa_tmp=1;
 381                         else
 382                                 s->s3->tmp.use_rsa_tmp=0;
 383
 384
 385                         /* only send if a DH key exchange, fortezza or
 386                          * RSA but we have a sign only certificate
 387                          *
 388                          * PSK: may send PSK identity hints
 389                          *
 390                          * For ECC ciphersuites, we send a serverKeyExchange
 391                          * message only if the cipher suite is either
 392                          * ECDH-anon or ECDHE. In other cases, the
 393                          * server certificate contains the server's
 394                          * public key for key exchange.
 395                          */
 396                         if (s->s3->tmp.use_rsa_tmp
 397                         /* PSK: send ServerKeyExchange if PSK identity
 398                          * hint if provided */
 399 #ifndef OPENSSL_NO_PSK
 400                             || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
 401 #endif
 402                             || (alg_k & (SSL_kDHr|SSL_kDHd|SSL_kEDH))
 403                             || (alg_k & SSL_kEECDH)
 404                             || ((alg_k & SSL_kRSA)
 405                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
 406                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
 407                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
 408                                         )
 409                                     )
 410                                 )
 411                             )
 412                                 {
 413                                 ret=ssl3_send_server_key_exchange(s);
 414                                 if (ret <= 0) goto end;
 415                                 }
 416                         else
 417                                 skip=1;
 418
 419                         s->state=SSL3_ST_SW_CERT_REQ_A;
 420                         s->init_num=0;
 421                         break;
 422
 423                 case SSL3_ST_SW_CERT_REQ_A:
 424                 case SSL3_ST_SW_CERT_REQ_B:
 425                         if (/* don't request cert unless asked for it: */
 426                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
 427                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
 428                                  * don't request cert during re-negotiation: */
 429                                 ((s->session->peer != NULL) &&
 430                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
 431                                 /* never request cert in anonymous ciphersuites
 432                                  * (see section "Certificate request" in SSL 3 drafts
 433                                  * and in RFC 2246): */
 434                                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
 435                                  /* ... except when the application insists on verification
 436                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
 437                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
 438                                  /* never request cert in Kerberos ciphersuites */
 439                                 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5)
 440                                 /* With normal PSK Certificates and
 441                                  * Certificate Requests are omitted */
 442                                 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 443                                 {
 444                                 /* no cert request */
 445                                 skip=1;
 446                                 s->s3->tmp.cert_request=0;
 447                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 448                                 }
 449                         else
 450                                 {
 451                                 s->s3->tmp.cert_request=1;
 452                                 ret=ssl3_send_certificate_request(s);
 453                                 if (ret <= 0) goto end;
 454 #ifndef NETSCAPE_HANG_BUG
 455                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 456 #else
 457                                 s->state=SSL3_ST_SW_FLUSH;
 458                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 459 #endif
 460                                 s->init_num=0;
 461                                 }
 462                         break;
 463
 464                 case SSL3_ST_SW_SRVR_DONE_A:
 465                 case SSL3_ST_SW_SRVR_DONE_B:
 466                         ret=ssl3_send_server_done(s);
 467                         if (ret <= 0) goto end;
 468                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 469                         s->state=SSL3_ST_SW_FLUSH;
 470                         s->init_num=0;
 471                         break;
 472
 473                 case SSL3_ST_SW_FLUSH:
 474                         /* number of bytes to be flushed */
 475                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 476                         if (num1 > 0)
 477                                 {
 478                                 s->rwstate=SSL_WRITING;
 479                                 num1=BIO_flush(s->wbio);
 480                                 if (num1 <= 0) { ret= -1; goto end; }
 481                                 s->rwstate=SSL_NOTHING;
 482                                 }
 483
 484                         s->state=s->s3->tmp.next_state;
 485                         break;
 486
 487                 case SSL3_ST_SR_CERT_A:
 488                 case SSL3_ST_SR_CERT_B:
 489                         /* Check for second client hello (MS SGC) */
 490                         ret = ssl3_check_client_hello(s);
 491                         if (ret <= 0)
 492                                 goto end;
 493                         if (ret == 2)
 494                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
 495                         else {
 496                                 if (s->s3->tmp.cert_request)
 497                                         {
 498                                         ret=ssl3_get_client_certificate(s);
 499                                         if (ret <= 0) goto end;
 500                                         }
 501                                 s->init_num=0;
 502                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
 503                         }
 504                         break;
 505
 506                 case SSL3_ST_SR_KEY_EXCH_A:
 507                 case SSL3_ST_SR_KEY_EXCH_B:
 508                         ret=ssl3_get_client_key_exchange(s);
 509                         if (ret <= 0)
 510                                 goto end;
 511                         if (ret == 2)
 512                                 {
 513                                 /* For the ECDH ciphersuites when
 514                                  * the client sends its ECDH pub key in
 515                                  * a certificate, the CertificateVerify
 516                                  * message is not sent.
 517                                  */
 518                                 s->state=SSL3_ST_SR_FINISHED_A;
 519                                 s->init_num = 0;
 520                                 }
 521                         else
 522                                 {
 523                                 int offset=0;
 524                                 int dgst_num;
 525                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
 526                                 s->init_num=0;
 527
 528                                 /* We need to get hashes here so if there is
 529                                  * a client cert, it can be verified
 530                                  * FIXME - digest processing for CertificateVerify
 531                                  * should be generalized. But it is next step
 532                                  */
 533                                 if (s->s3->handshake_buffer)
 534                                         ssl3_digest_cached_records(s);
 535                                 for (dgst_num=0; dgst_num<SSL_MAX_DIGEST;dgst_num++)
 536                                         if (s->s3->handshake_dgst[dgst_num])
 537                                                 {
 538                                                 s->method->ssl3_enc->cert_verify_mac(s,EVP_MD_CTX_type(s->s3->handshake_dgst[dgst_num]),&(s->s3->tmp.cert_verify_md[offset]));
 539                                                 offset+=EVP_MD_CTX_size(s->s3->handshake_dgst[dgst_num]);
 540                                                 }
 541                                 }
 542                         break;
 543
 544                 case SSL3_ST_SR_CERT_VRFY_A:
 545                 case SSL3_ST_SR_CERT_VRFY_B:
 546
 547                         /* we should decide if we expected this one */
 548                         ret=ssl3_get_cert_verify(s);
 549                         if (ret <= 0) goto end;
 550
 551                         s->state=SSL3_ST_SR_FINISHED_A;
 552                         s->init_num=0;
 553                         break;
 554
 555                 case SSL3_ST_SR_FINISHED_A:
 556                 case SSL3_ST_SR_FINISHED_B:
 557                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
 558                                 SSL3_ST_SR_FINISHED_B);
 559                         if (ret <= 0) goto end;
 560 #ifndef OPENSSL_NO_TLSEXT
 561                         if (s->tlsext_ticket_expected)
 562                                 s->state=SSL3_ST_SW_SESSION_TICKET_A;
 563                         else if (s->hit)
 564                                 s->state=SSL_ST_OK;
 565 #else
 566                         if (s->hit)
 567                                 s->state=SSL_ST_OK;
 568 #endif
 569                         else
 570                                 s->state=SSL3_ST_SW_CHANGE_A;
 571                         s->init_num=0;
 572                         break;
 573
 574 #ifndef OPENSSL_NO_TLSEXT
 575                 case SSL3_ST_SW_SESSION_TICKET_A:
 576                 case SSL3_ST_SW_SESSION_TICKET_B:
 577                         ret=ssl3_send_newsession_ticket(s);
 578                         if (ret <= 0) goto end;
 579                         s->state=SSL3_ST_SW_CHANGE_A;
 580                         s->init_num=0;
 581                         break;
 582
 583                 case SSL3_ST_SW_CERT_STATUS_A:
 584                 case SSL3_ST_SW_CERT_STATUS_B:
 585                         ret=ssl3_send_cert_status(s);
 586                         if (ret <= 0) goto end;
 587                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 588                         s->init_num=0;
 589                         break;
 590
 591 #endif
 592
 593                 case SSL3_ST_SW_CHANGE_A:
 594                 case SSL3_ST_SW_CHANGE_B:
 595
 596                         s->session->cipher=s->s3->tmp.new_cipher;
 597                         if (!s->method->ssl3_enc->setup_key_block(s))
 598                                 { ret= -1; goto end; }
 599
 600                         ret=ssl3_send_change_cipher_spec(s,
 601                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
 602
 603                         if (ret <= 0) goto end;
 604                         s->state=SSL3_ST_SW_FINISHED_A;
 605                         s->init_num=0;
 606
 607                         if (!s->method->ssl3_enc->change_cipher_state(s,
 608                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
 609                                 {
 610                                 ret= -1;
 611                                 goto end;
 612                                 }
 613
 614                         break;
 615
 616                 case SSL3_ST_SW_FINISHED_A:
 617                 case SSL3_ST_SW_FINISHED_B:
 618                         ret=ssl3_send_finished(s,
 619                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
 620                                 s->method->ssl3_enc->server_finished_label,
 621                                 s->method->ssl3_enc->server_finished_label_len);
 622                         if (ret <= 0) goto end;
 623                         s->state=SSL3_ST_SW_FLUSH;
 624                         if (s->hit)
 625                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 626                         else
 627                                 s->s3->tmp.next_state=SSL_ST_OK;
 628                         s->init_num=0;
 629                         break;
 630
 631                 case SSL_ST_OK:
 632                         /* clean a few things up */
 633                         ssl3_cleanup_key_block(s);
 634
 635                         BUF_MEM_free(s->init_buf);
 636                         s->init_buf=NULL;
 637
 638                         /* remove buffering on output */
 639                         ssl_free_wbio_buffer(s);
 640
 641                         s->init_num=0;
 642
 643                         if (s->new_session == 2) /* skipped if we just sent a HelloRequest */
 644                                 {
 645                                 /* actually not necessarily a 'new' session unless
 646                                  * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */
 647
 648                                 s->new_session=0;
 649
 650                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 651
 652                                 s->ctx->stats.sess_accept_good++;
 653                                 /* s->server=1; */
 654                                 s->handshake_func=ssl3_accept;
 655
 656                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 657                                 }
 658
 659                         ret = 1;
 660                         goto end;
 661                         /* break; */
 662
 663                 default:
 664                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
 665                         ret= -1;
 666                         goto end;
 667                         /* break; */
 668                         }
 669
 670                 if (!s->s3->tmp.reuse_message && !skip)
 671                         {
 672                         if (s->debug)
 673                                 {
 674                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 675                                         goto end;
 676                                 }
 677
 678
 679                         if ((cb != NULL) && (s->state != state))
 680                                 {
 681                                 new_state=s->state;
 682                                 s->state=state;
 683                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
 684                                 s->state=new_state;
 685                                 }
 686                         }
 687                 skip=0;
 688                 }
 689 end:
 690         /* BIO_flush(s->wbio); */
 691
 692         s->in_handshake--;
 693         if (cb != NULL)
 694                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 695         return(ret);
 696         }
 697
 698 int ssl3_send_hello_request(SSL *s)
 699         {
 700         unsigned char *p;
 701
 702         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
 703                 {
 704                 p=(unsigned char *)s->init_buf->data;
 705                 *(p++)=SSL3_MT_HELLO_REQUEST;
 706                 *(p++)=0;
 707                 *(p++)=0;
 708                 *(p++)=0;
 709
 710                 s->state=SSL3_ST_SW_HELLO_REQ_B;
 711                 /* number of bytes to write */
 712                 s->init_num=4;
 713                 s->init_off=0;
 714                 }
 715
 716         /* SSL3_ST_SW_HELLO_REQ_B */
 717         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 718         }
 719
 720 int ssl3_check_client_hello(SSL *s)
 721         {
 722         int ok;
 723         long n;
 724
 725         /* this function is called when we really expect a Certificate message,
 726          * so permit appropriate message length */
 727         n=s->method->ssl_get_message(s,
 728                 SSL3_ST_SR_CERT_A,
 729                 SSL3_ST_SR_CERT_B,
 730                 -1,
 731                 s->max_cert_list,
 732                 &ok);
 733         if (!ok) return((int)n);
 734         s->s3->tmp.reuse_message = 1;
 735         if (s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO)
 736                 {
 737                 /* Throw away what we have done so far in the current handshake,
 738                  * which will now be aborted. (A full SSL_clear would be too much.)
 739                  * I hope that tmp.dh is the only thing that may need to be cleared
 740                  * when a handshake is not completed ... */
 741 #ifndef OPENSSL_NO_DH
 742                 if (s->s3->tmp.dh != NULL)
 743                         {
 744                         DH_free(s->s3->tmp.dh);
 745                         s->s3->tmp.dh = NULL;
 746                         }
 747 #endif
 748                 return 2;
 749                 }
 750         return 1;
 751 }
 752
 753 int ssl3_get_client_hello(SSL *s)
 754         {
 755         int i,j,ok,al,ret= -1;
 756         unsigned int cookie_len;
 757         long n;
 758         unsigned long id;
 759         unsigned char *p,*d,*q;
 760         SSL_CIPHER *c;
 761 #ifndef OPENSSL_NO_COMP
 762         SSL_COMP *comp=NULL;
 763 #endif
 764         STACK_OF(SSL_CIPHER) *ciphers=NULL;
 765
 766         /* We do this so that we will respond with our native type.
 767          * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
 768          * This down switching should be handled by a different method.
 769          * If we are SSLv3, we will respond with SSLv3, even if prompted with
 770          * TLSv1.
 771          */
 772         if (s->state == SSL3_ST_SR_CLNT_HELLO_A)
 773                 {
 774                 s->state=SSL3_ST_SR_CLNT_HELLO_B;
 775                 }
 776         s->first_packet=1;
 777         n=s->method->ssl_get_message(s,
 778                 SSL3_ST_SR_CLNT_HELLO_B,
 779                 SSL3_ST_SR_CLNT_HELLO_C,
 780                 SSL3_MT_CLIENT_HELLO,
 781                 SSL3_RT_MAX_PLAIN_LENGTH,
 782                 &ok);
 783
 784         if (!ok) return((int)n);
 785         s->first_packet=0;
 786         d=p=(unsigned char *)s->init_msg;
 787
 788         /* use version from inside client hello, not from record header
 789          * (may differ: see RFC 2246, Appendix E, second paragraph) */
 790         s->client_version=(((int)p[0])<<8)|(int)p[1];
 791         p+=2;
 792
 793         if ((s->version == DTLS1_VERSION && s->client_version > s->version) ||
 794             (s->version != DTLS1_VERSION && s->client_version < s->version))
 795                 {
 796                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER);
 797                 if ((s->client_version>>8) == SSL3_VERSION_MAJOR)
 798                         {
 799                         /* similar to ssl3_get_record, send alert using remote version number */
 800                         s->version = s->client_version;
 801                         }
 802                 al = SSL_AD_PROTOCOL_VERSION;
 803                 goto f_err;
 804                 }
 805
 806         /* load the client random */
 807         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
 808         p+=SSL3_RANDOM_SIZE;
 809
 810         /* get the session-id */
 811         j= *(p++);
 812
 813         s->hit=0;
 814         /* Versions before 0.9.7 always allow session reuse during renegotiation
 815          * (i.e. when s->new_session is true), option
 816          * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is new with 0.9.7.
 817          * Maybe this optional behaviour should always have been the default,
 818          * but we cannot safely change the default behaviour (or new applications
 819          * might be written that become totally unsecure when compiled with
 820          * an earlier library version)
 821          */
 822         if ((s->new_session && (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION)))
 823                 {
 824                 if (!ssl_get_new_session(s,1))
 825                         goto err;
 826                 }
 827         else
 828                 {
 829                 i=ssl_get_prev_session(s, p, j, d + n);
 830                 if (i == 1)
 831                         { /* previous session */
 832                         s->hit=1;
 833                         }
 834                 else if (i == -1)
 835                         goto err;
 836                 else /* i == 0 */
 837                         {
 838                         if (!ssl_get_new_session(s,1))
 839                                 goto err;
 840                         }
 841                 }
 842
 843         p+=j;
 844
 845         if (s->version == DTLS1_VERSION)
 846                 {
 847                 /* cookie stuff */
 848                 cookie_len = *(p++);
 849
 850                 if ( (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) &&
 851                         s->d1->send_cookie == 0)
 852                         {
 853                         /* HelloVerifyMessage has already been sent */
 854                         if ( cookie_len != s->d1->cookie_len)
 855                                 {
 856                                 al = SSL_AD_HANDSHAKE_FAILURE;
 857                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
 858                                 goto f_err;
 859                                 }
 860                         }
 861
 862                 /*
 863                  * The ClientHello may contain a cookie even if the
 864                  * HelloVerify message has not been sent--make sure that it
 865                  * does not cause an overflow.
 866                  */
 867                 if ( cookie_len > sizeof(s->d1->rcvd_cookie))
 868                         {
 869                         /* too much data */
 870                         al = SSL_AD_DECODE_ERROR;
 871                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
 872                         goto f_err;
 873                         }
 874
 875                 /* verify the cookie if appropriate option is set. */
 876                 if ( (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) &&
 877                         cookie_len > 0)
 878                         {
 879                         memcpy(s->d1->rcvd_cookie, p, cookie_len);
 880
 881                         if ( s->ctx->app_verify_cookie_cb != NULL)
 882                                 {
 883                                 if ( s->ctx->app_verify_cookie_cb(s, s->d1->rcvd_cookie,
 884                                         cookie_len) == 0)
 885                                         {
 886                                         al=SSL_AD_HANDSHAKE_FAILURE;
 887                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
 888                                                 SSL_R_COOKIE_MISMATCH);
 889                                         goto f_err;
 890                                         }
 891                                 /* else cookie verification succeeded */
 892                                 }
 893                         else if ( memcmp(s->d1->rcvd_cookie, s->d1->cookie,
 894                                                   s->d1->cookie_len) != 0) /* default verification */
 895                                 {
 896                                         al=SSL_AD_HANDSHAKE_FAILURE;
 897                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
 898                                                 SSL_R_COOKIE_MISMATCH);
 899                                         goto f_err;
 900                                 }
 901                         }
 902
 903                 p += cookie_len;
 904                 }
 905
 906         n2s(p,i);
 907         if ((i == 0) && (j != 0))
 908                 {
 909                 /* we need a cipher if we are not resuming a session */
 910                 al=SSL_AD_ILLEGAL_PARAMETER;
 911                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
 912                 goto f_err;
 913                 }
 914         if ((p+i) >= (d+n))
 915                 {
 916                 /* not enough data */
 917                 al=SSL_AD_DECODE_ERROR;
 918                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 919                 goto f_err;
 920                 }
 921         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
 922                 == NULL))
 923                 {
 924                 goto err;
 925                 }
 926         p+=i;
 927
 928         /* If it is a hit, check that the cipher is in the list */
 929         if ((s->hit) && (i > 0))
 930                 {
 931                 j=0;
 932                 id=s->session->cipher->id;
 933
 934 #ifdef CIPHER_DEBUG
 935                 printf("client sent %d ciphers\n",sk_num(ciphers));
 936 #endif
 937                 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
 938                         {
 939                         c=sk_SSL_CIPHER_value(ciphers,i);
 940 #ifdef CIPHER_DEBUG
 941                         printf("client [%2d of %2d]:%s\n",
 942                                 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
 943 #endif
 944                         if (c->id == id)
 945                                 {
 946                                 j=1;
 947                                 break;
 948                                 }
 949                         }
 950                 if (j == 0 && (s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
 951                         {
 952                         /* Special case as client bug workaround: the previously used cipher may
 953                          * not be in the current list, the client instead might be trying to
 954                          * continue using a cipher that before wasn't chosen due to server
 955                          * preferences.  We'll have to reject the connection if the cipher is not
 956                          * enabled, though. */
 957                         c = sk_SSL_CIPHER_value(ciphers, 0);
 958                         if (sk_SSL_CIPHER_find(SSL_get_ciphers(s), c) >= 0)
 959                                 {
 960                                 s->session->cipher = c;
 961                                 j = 1;
 962                                 }
 963                         }
 964                 if (j == 0)
 965                         {
 966                         /* we need to have the cipher in the cipher
 967                          * list if we are asked to reuse it */
 968                         al=SSL_AD_ILLEGAL_PARAMETER;
 969                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
 970                         goto f_err;
 971                         }
 972                 }
 973
 974         /* compression */
 975         i= *(p++);
 976         if ((p+i) > (d+n))
 977                 {
 978                 /* not enough data */
 979                 al=SSL_AD_DECODE_ERROR;
 980                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 981                 goto f_err;
 982                 }
 983         q=p;
 984         for (j=0; j<i; j++)
 985                 {
 986                 if (p[j] == 0) break;
 987                 }
 988
 989         p+=i;
 990         if (j >= i)
 991                 {
 992                 /* no compress */
 993                 al=SSL_AD_DECODE_ERROR;
 994                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
 995                 goto f_err;
 996                 }
 997
 998 #ifndef OPENSSL_NO_TLSEXT
 999         /* TLS extensions*/
1000         if (s->version > SSL3_VERSION)
1001                 {
1002                 if (!ssl_parse_clienthello_tlsext(s,&p,d,n, &al))
1003                         {
1004                         /* 'al' set by ssl_parse_clienthello_tlsext */
1005                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_PARSE_TLSEXT);
1006                         goto f_err;
1007                         }
1008                 }
1009                 if (ssl_check_clienthello_tlsext(s) <= 0) {
1010                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
1011                         goto err;
1012                 }
1013 #endif
1014
1015         /* Worst case, we will use the NULL compression, but if we have other
1016          * options, we will now look for them.  We have i-1 compression
1017          * algorithms from the client, starting at q. */
1018         s->s3->tmp.new_compression=NULL;
1019 #ifndef OPENSSL_NO_COMP
1020         if (!(s->options & SSL_OP_NO_COMPRESSION) && s->ctx->comp_methods)
1021                 { /* See if we have a match */
1022                 int m,nn,o,v,done=0;
1023
1024                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
1025                 for (m=0; m<nn; m++)
1026                         {
1027                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1028                         v=comp->id;
1029                         for (o=0; o<i; o++)
1030                                 {
1031                                 if (v == q[o])
1032                                         {
1033                                         done=1;
1034                                         break;
1035                                         }
1036                                 }
1037                         if (done) break;
1038                         }
1039                 if (done)
1040                         s->s3->tmp.new_compression=comp;
1041                 else
1042                         comp=NULL;
1043                 }
1044 #endif
1045
1046         /* Given s->session->ciphers and SSL_get_ciphers, we must
1047          * pick a cipher */
1048
1049         if (!s->hit)
1050                 {
1051 #ifdef OPENSSL_NO_COMP
1052                 s->session->compress_meth=0;
1053 #else
1054                 s->session->compress_meth=(comp == NULL)?0:comp->id;
1055 #endif
1056                 if (s->session->ciphers != NULL)
1057                         sk_SSL_CIPHER_free(s->session->ciphers);
1058                 s->session->ciphers=ciphers;
1059                 if (ciphers == NULL)
1060                         {
1061                         al=SSL_AD_ILLEGAL_PARAMETER;
1062                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
1063                         goto f_err;
1064                         }
1065                 ciphers=NULL;
1066                 c=ssl3_choose_cipher(s,s->session->ciphers,
1067                                      SSL_get_ciphers(s));
1068
1069                 if (c == NULL)
1070                         {
1071                         al=SSL_AD_HANDSHAKE_FAILURE;
1072                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1073                         goto f_err;
1074                         }
1075                 s->s3->tmp.new_cipher=c;
1076                 }
1077         else
1078                 {
1079                 /* Session-id reuse */
1080 #ifdef REUSE_CIPHER_BUG
1081                 STACK_OF(SSL_CIPHER) *sk;
1082                 SSL_CIPHER *nc=NULL;
1083                 SSL_CIPHER *ec=NULL;
1084
1085                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
1086                         {
1087                         sk=s->session->ciphers;
1088                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
1089                                 {
1090                                 c=sk_SSL_CIPHER_value(sk,i);
1091                                 if (c->algorithm_enc & SSL_eNULL)
1092                                         nc=c;
1093                                 if (SSL_C_IS_EXPORT(c))
1094                                         ec=c;
1095                                 }
1096                         if (nc != NULL)
1097                                 s->s3->tmp.new_cipher=nc;
1098                         else if (ec != NULL)
1099                                 s->s3->tmp.new_cipher=ec;
1100                         else
1101                                 s->s3->tmp.new_cipher=s->session->cipher;
1102                         }
1103                 else
1104 #endif
1105                 s->s3->tmp.new_cipher=s->session->cipher;
1106                 }
1107
1108         ssl3_digest_cached_records(s);
1109
1110         /* we now have the following setup.
1111          * client_random
1112          * cipher_list          - our prefered list of ciphers
1113          * ciphers              - the clients prefered list of ciphers
1114          * compression          - basically ignored right now
1115          * ssl version is set   - sslv3
1116          * s->session           - The ssl session has been setup.
1117          * s->hit               - session reuse flag
1118          * s->tmp.new_cipher    - the new cipher to use.
1119          */
1120
1121         ret=1;
1122         if (0)
1123                 {
1124 f_err:
1125                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1126                 }
1127 err:
1128         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
1129         return(ret);
1130         }
1131
1132 int ssl3_send_server_hello(SSL *s)
1133         {
1134         unsigned char *buf;
1135         unsigned char *p,*d;
1136         int i,sl;
1137         unsigned long l,Time;
1138
1139         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
1140                 {
1141                 buf=(unsigned char *)s->init_buf->data;
1142                 p=s->s3->server_random;
1143                 Time=(unsigned long)time(NULL);                 /* Time */
1144                 l2n(Time,p);
1145                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
1146                         return -1;
1147                 /* Do the message type and length last */
1148                 d=p= &(buf[4]);
1149
1150                 *(p++)=s->version>>8;
1151                 *(p++)=s->version&0xff;
1152
1153                 /* Random stuff */
1154                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
1155                 p+=SSL3_RANDOM_SIZE;
1156
1157                 /* now in theory we have 3 options to sending back the
1158                  * session id.  If it is a re-use, we send back the
1159                  * old session-id, if it is a new session, we send
1160                  * back the new session-id or we send back a 0 length
1161                  * session-id if we want it to be single use.
1162                  * Currently I will not implement the '0' length session-id
1163                  * 12-Jan-98 - I'll now support the '0' length stuff.
1164                  *
1165                  * We also have an additional case where stateless session
1166                  * resumption is successful: we always send back the old
1167                  * session id. In this case s->hit is non zero: this can
1168                  * only happen if stateless session resumption is succesful
1169                  * if session caching is disabled so existing functionality
1170                  * is unaffected.
1171                  */
1172                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)
1173                         && !s->hit)
1174                         s->session->session_id_length=0;
1175
1176                 sl=s->session->session_id_length;
1177                 if (sl > (int)sizeof(s->session->session_id))
1178                         {
1179                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1180                         return -1;
1181                         }
1182                 *(p++)=sl;
1183                 memcpy(p,s->session->session_id,sl);
1184                 p+=sl;
1185
1186                 /* put the cipher */
1187                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
1188                 p+=i;
1189
1190                 /* put the compression method */
1191 #ifdef OPENSSL_NO_COMP
1192                         *(p++)=0;
1193 #else
1194                 if (s->s3->tmp.new_compression == NULL)
1195                         *(p++)=0;
1196                 else
1197                         *(p++)=s->s3->tmp.new_compression->id;
1198 #endif
1199 #ifndef OPENSSL_NO_TLSEXT
1200                 if (ssl_prepare_serverhello_tlsext(s) <= 0)
1201                         {
1202                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
1203                         return -1;
1204                         }
1205                 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
1206                         {
1207                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
1208                         return -1;
1209                         }
1210 #endif
1211                 /* do the header */
1212                 l=(p-d);
1213                 d=buf;
1214                 *(d++)=SSL3_MT_SERVER_HELLO;
1215                 l2n3(l,d);
1216
1217                 s->state=SSL3_ST_SW_SRVR_HELLO_B;
1218                 /* number of bytes to write */
1219                 s->init_num=p-buf;
1220                 s->init_off=0;
1221                 }
1222
1223         /* SSL3_ST_SW_SRVR_HELLO_B */
1224         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1225         }
1226
1227 int ssl3_send_server_done(SSL *s)
1228         {
1229         unsigned char *p;
1230
1231         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1232                 {
1233                 p=(unsigned char *)s->init_buf->data;
1234
1235                 /* do the header */
1236                 *(p++)=SSL3_MT_SERVER_DONE;
1237                 *(p++)=0;
1238                 *(p++)=0;
1239                 *(p++)=0;
1240
1241                 s->state=SSL3_ST_SW_SRVR_DONE_B;
1242                 /* number of bytes to write */
1243                 s->init_num=4;
1244                 s->init_off=0;
1245                 }
1246
1247         /* SSL3_ST_SW_SRVR_DONE_B */
1248         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1249         }
1250
1251 int ssl3_send_server_key_exchange(SSL *s)
1252         {
1253 #ifndef OPENSSL_NO_RSA
1254         unsigned char *q;
1255         int j,num;
1256         RSA *rsa;
1257         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1258         unsigned int u;
1259 #endif
1260 #ifndef OPENSSL_NO_DH
1261         DH *dh=NULL,*dhp;
1262 #endif
1263 #ifndef OPENSSL_NO_ECDH
1264         EC_KEY *ecdh=NULL, *ecdhp;
1265         unsigned char *encodedPoint = NULL;
1266         int encodedlen = 0;
1267         int curve_id = 0;
1268         BN_CTX *bn_ctx = NULL;
1269 #endif
1270         EVP_PKEY *pkey;
1271         unsigned char *p,*d;
1272         int al,i;
1273         unsigned long type;
1274         int n;
1275         CERT *cert;
1276         BIGNUM *r[4];
1277         int nr[4],kn;
1278         BUF_MEM *buf;
1279         EVP_MD_CTX md_ctx;
1280
1281         EVP_MD_CTX_init(&md_ctx);
1282         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1283                 {
1284                 type=s->s3->tmp.new_cipher->algorithm_mkey;
1285                 cert=s->cert;
1286
1287                 buf=s->init_buf;
1288
1289                 r[0]=r[1]=r[2]=r[3]=NULL;
1290                 n=0;
1291 #ifndef OPENSSL_NO_RSA
1292                 if (type & SSL_kRSA)
1293                         {
1294                         rsa=cert->rsa_tmp;
1295                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1296                                 {
1297                                 rsa=s->cert->rsa_tmp_cb(s,
1298                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1299                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1300                                 if(rsa == NULL)
1301                                 {
1302                                         al=SSL_AD_HANDSHAKE_FAILURE;
1303                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1304                                         goto f_err;
1305                                 }
1306                                 RSA_up_ref(rsa);
1307                                 cert->rsa_tmp=rsa;
1308                                 }
1309                         if (rsa == NULL)
1310                                 {
1311                                 al=SSL_AD_HANDSHAKE_FAILURE;
1312                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1313                                 goto f_err;
1314                                 }
1315                         r[0]=rsa->n;
1316                         r[1]=rsa->e;
1317                         s->s3->tmp.use_rsa_tmp=1;
1318                         }
1319                 else
1320 #endif
1321 #ifndef OPENSSL_NO_DH
1322                         if (type & SSL_kEDH)
1323                         {
1324                         dhp=cert->dh_tmp;
1325                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1326                                 dhp=s->cert->dh_tmp_cb(s,
1327                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1328                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1329                         if (dhp == NULL)
1330                                 {
1331                                 al=SSL_AD_HANDSHAKE_FAILURE;
1332                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1333                                 goto f_err;
1334                                 }
1335
1336                         if (s->s3->tmp.dh != NULL)
1337                                 {
1338                                 DH_free(dh);
1339                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1340                                 goto err;
1341                                 }
1342
1343                         if ((dh=DHparams_dup(dhp)) == NULL)
1344                                 {
1345                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1346                                 goto err;
1347                                 }
1348
1349                         s->s3->tmp.dh=dh;
1350                         if ((dhp->pub_key == NULL ||
1351                              dhp->priv_key == NULL ||
1352                              (s->options & SSL_OP_SINGLE_DH_USE)))
1353                                 {
1354                                 if(!DH_generate_key(dh))
1355                                     {
1356                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1357                                            ERR_R_DH_LIB);
1358                                     goto err;
1359                                     }
1360                                 }
1361                         else
1362                                 {
1363                                 dh->pub_key=BN_dup(dhp->pub_key);
1364                                 dh->priv_key=BN_dup(dhp->priv_key);
1365                                 if ((dh->pub_key == NULL) ||
1366                                         (dh->priv_key == NULL))
1367                                         {
1368                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1369                                         goto err;
1370                                         }
1371                                 }
1372                         r[0]=dh->p;
1373                         r[1]=dh->g;
1374                         r[2]=dh->pub_key;
1375                         }
1376                 else
1377 #endif
1378 #ifndef OPENSSL_NO_ECDH
1379                         if (type & SSL_kEECDH)
1380                         {
1381                         const EC_GROUP *group;
1382
1383                         ecdhp=cert->ecdh_tmp;
1384                         if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
1385                                 {
1386                                 ecdhp=s->cert->ecdh_tmp_cb(s,
1387                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1388                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1389                                 }
1390                         if (ecdhp == NULL)
1391                                 {
1392                                 al=SSL_AD_HANDSHAKE_FAILURE;
1393                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1394                                 goto f_err;
1395                                 }
1396
1397                         if (s->s3->tmp.ecdh != NULL)
1398                                 {
1399                                 EC_KEY_free(s->s3->tmp.ecdh);
1400                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1401                                 goto err;
1402                                 }
1403
1404                         /* Duplicate the ECDH structure. */
1405                         if (ecdhp == NULL)
1406                                 {
1407                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1408                                 goto err;
1409                                 }
1410                         if (!EC_KEY_up_ref(ecdhp))
1411                                 {
1412                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1413                                 goto err;
1414                                 }
1415                         ecdh = ecdhp;
1416
1417                         s->s3->tmp.ecdh=ecdh;
1418                         if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1419                             (EC_KEY_get0_private_key(ecdh) == NULL) ||
1420                             (s->options & SSL_OP_SINGLE_ECDH_USE))
1421                                 {
1422                                 if(!EC_KEY_generate_key(ecdh))
1423                                     {
1424                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1425                                     goto err;
1426                                     }
1427                                 }
1428
1429                         if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1430                             (EC_KEY_get0_public_key(ecdh)  == NULL) ||
1431                             (EC_KEY_get0_private_key(ecdh) == NULL))
1432                                 {
1433                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1434                                 goto err;
1435                                 }
1436
1437                         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1438                             (EC_GROUP_get_degree(group) > 163))
1439                                 {
1440                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1441                                 goto err;
1442                                 }
1443
1444                         /* XXX: For now, we only support ephemeral ECDH
1445                          * keys over named (not generic) curves. For
1446                          * supported named curves, curve_id is non-zero.
1447                          */
1448                         if ((curve_id =
1449                             tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1450                             == 0)
1451                                 {
1452                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1453                                 goto err;
1454                                 }
1455
1456                         /* Encode the public key.
1457                          * First check the size of encoding and
1458                          * allocate memory accordingly.
1459                          */
1460                         encodedlen = EC_POINT_point2oct(group,
1461                             EC_KEY_get0_public_key(ecdh),
1462                             POINT_CONVERSION_UNCOMPRESSED,
1463                             NULL, 0, NULL);
1464
1465                         encodedPoint = (unsigned char *)
1466                             OPENSSL_malloc(encodedlen*sizeof(unsigned char));
1467                         bn_ctx = BN_CTX_new();
1468                         if ((encodedPoint == NULL) || (bn_ctx == NULL))
1469                                 {
1470                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1471                                 goto err;
1472                                 }
1473
1474
1475                         encodedlen = EC_POINT_point2oct(group,
1476                             EC_KEY_get0_public_key(ecdh),
1477                             POINT_CONVERSION_UNCOMPRESSED,
1478                             encodedPoint, encodedlen, bn_ctx);
1479
1480                         if (encodedlen == 0)
1481                                 {
1482                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1483                                 goto err;
1484                                 }
1485
1486                         BN_CTX_free(bn_ctx);  bn_ctx=NULL;
1487
1488                         /* XXX: For now, we only support named (not
1489                          * generic) curves in ECDH ephemeral key exchanges.
1490                          * In this situation, we need four additional bytes
1491                          * to encode the entire ServerECDHParams
1492                          * structure.
1493                          */
1494                         n = 4 + encodedlen;
1495
1496                         /* We'll generate the serverKeyExchange message
1497                          * explicitly so we can set these to NULLs
1498                          */
1499                         r[0]=NULL;
1500                         r[1]=NULL;
1501                         r[2]=NULL;
1502                         r[3]=NULL;
1503                         }
1504                 else
1505 #endif /* !OPENSSL_NO_ECDH */
1506 #ifndef OPENSSL_NO_PSK
1507                         if (type & SSL_kPSK)
1508                                 {
1509                                 /* reserve size for record length and PSK identity hint*/
1510                                 n+=2+strlen(s->ctx->psk_identity_hint);
1511                                 }
1512                         else
1513 #endif /* !OPENSSL_NO_PSK */
1514                         {
1515                         al=SSL_AD_HANDSHAKE_FAILURE;
1516                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1517                         goto f_err;
1518                         }
1519                 for (i=0; r[i] != NULL; i++)
1520                         {
1521                         nr[i]=BN_num_bytes(r[i]);
1522                         n+=2+nr[i];
1523                         }
1524
1525                 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1526                         && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
1527                         {
1528                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
1529                                 == NULL)
1530                                 {
1531                                 al=SSL_AD_DECODE_ERROR;
1532                                 goto f_err;
1533                                 }
1534                         kn=EVP_PKEY_size(pkey);
1535                         }
1536                 else
1537                         {
1538                         pkey=NULL;
1539                         kn=0;
1540                         }
1541
1542                 if (!BUF_MEM_grow_clean(buf,n+4+kn))
1543                         {
1544                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1545                         goto err;
1546                         }
1547                 d=(unsigned char *)s->init_buf->data;
1548                 p= &(d[4]);
1549
1550                 for (i=0; r[i] != NULL; i++)
1551                         {
1552                         s2n(nr[i],p);
1553                         BN_bn2bin(r[i],p);
1554                         p+=nr[i];
1555                         }
1556
1557 #ifndef OPENSSL_NO_ECDH
1558                 if (type & SSL_kEECDH)
1559                         {
1560                         /* XXX: For now, we only support named (not generic) curves.
1561                          * In this situation, the serverKeyExchange message has:
1562                          * [1 byte CurveType], [2 byte CurveName]
1563                          * [1 byte length of encoded point], followed by
1564                          * the actual encoded point itself
1565                          */
1566                         *p = NAMED_CURVE_TYPE;
1567                         p += 1;
1568                         *p = 0;
1569                         p += 1;
1570                         *p = curve_id;
1571                         p += 1;
1572                         *p = encodedlen;
1573                         p += 1;
1574                         memcpy((unsigned char*)p,
1575                             (unsigned char *)encodedPoint,
1576                             encodedlen);
1577                         OPENSSL_free(encodedPoint);
1578                         p += encodedlen;
1579                         }
1580 #endif
1581
1582 #ifndef OPENSSL_NO_PSK
1583                 if (type & SSL_kPSK)
1584                         {
1585                         /* copy PSK identity hint */
1586                         s2n(strlen(s->ctx->psk_identity_hint), p);
1587                         strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
1588                         p+=strlen(s->ctx->psk_identity_hint);
1589                         }
1590 #endif
1591
1592                 /* not anonymous */
1593                 if (pkey != NULL)
1594                         {
1595                         /* n is the length of the params, they start at &(d[4])
1596                          * and p points to the space at the end. */
1597 #ifndef OPENSSL_NO_RSA
1598                         if (pkey->type == EVP_PKEY_RSA)
1599                                 {
1600                                 q=md_buf;
1601                                 j=0;
1602                                 for (num=2; num > 0; num--)
1603                                         {
1604                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1605                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1606                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1607                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1608                                         EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1609                                         EVP_DigestFinal_ex(&md_ctx,q,
1610                                                 (unsigned int *)&i);
1611                                         q+=i;
1612                                         j+=i;
1613                                         }
1614                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1615                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1616                                         {
1617                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1618                                         goto err;
1619                                         }
1620                                 s2n(u,p);
1621                                 n+=u+2;
1622                                 }
1623                         else
1624 #endif
1625 #if !defined(OPENSSL_NO_DSA)
1626                                 if (pkey->type == EVP_PKEY_DSA)
1627                                 {
1628                                 /* lets do DSS */
1629                                 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
1630                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1631                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1632                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1633                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1634                                         (unsigned int *)&i,pkey))
1635                                         {
1636                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1637                                         goto err;
1638                                         }
1639                                 s2n(i,p);
1640                                 n+=i+2;
1641                                 }
1642                         else
1643 #endif
1644 #if !defined(OPENSSL_NO_ECDSA)
1645                                 if (pkey->type == EVP_PKEY_EC)
1646                                 {
1647                                 /* let's do ECDSA */
1648                                 EVP_SignInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1649                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1650                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1651                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1652                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1653                                         (unsigned int *)&i,pkey))
1654                                         {
1655                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_ECDSA);
1656                                         goto err;
1657                                         }
1658                                 s2n(i,p);
1659                                 n+=i+2;
1660                                 }
1661                         else
1662 #endif
1663                                 {
1664                                 /* Is this error check actually needed? */
1665                                 al=SSL_AD_HANDSHAKE_FAILURE;
1666                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1667                                 goto f_err;
1668                                 }
1669                         }
1670
1671                 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
1672                 l2n3(n,d);
1673
1674                 /* we should now have things packed up, so lets send
1675                  * it off */
1676                 s->init_num=n+4;
1677                 s->init_off=0;
1678                 }
1679
1680         s->state = SSL3_ST_SW_KEY_EXCH_B;
1681         EVP_MD_CTX_cleanup(&md_ctx);
1682         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1683 f_err:
1684         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1685 err:
1686 #ifndef OPENSSL_NO_ECDH
1687         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1688         BN_CTX_free(bn_ctx);
1689 #endif
1690         EVP_MD_CTX_cleanup(&md_ctx);
1691         return(-1);
1692         }
1693
1694 int ssl3_send_certificate_request(SSL *s)
1695         {
1696         unsigned char *p,*d;
1697         int i,j,nl,off,n;
1698         STACK_OF(X509_NAME) *sk=NULL;
1699         X509_NAME *name;
1700         BUF_MEM *buf;
1701
1702         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1703                 {
1704                 buf=s->init_buf;
1705
1706                 d=p=(unsigned char *)&(buf->data[4]);
1707
1708                 /* get the list of acceptable cert types */
1709                 p++;
1710                 n=ssl3_get_req_cert_type(s,p);
1711                 d[0]=n;
1712                 p+=n;
1713                 n++;
1714
1715                 off=n;
1716                 p+=2;
1717                 n+=2;
1718
1719                 sk=SSL_get_client_CA_list(s);
1720                 nl=0;
1721                 if (sk != NULL)
1722                         {
1723                         for (i=0; i<sk_X509_NAME_num(sk); i++)
1724                                 {
1725                                 name=sk_X509_NAME_value(sk,i);
1726                                 j=i2d_X509_NAME(name,NULL);
1727                                 if (!BUF_MEM_grow_clean(buf,4+n+j+2))
1728                                         {
1729                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1730                                         goto err;
1731                                         }
1732                                 p=(unsigned char *)&(buf->data[4+n]);
1733                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1734                                         {
1735                                         s2n(j,p);
1736                                         i2d_X509_NAME(name,&p);
1737                                         n+=2+j;
1738                                         nl+=2+j;
1739                                         }
1740                                 else
1741                                         {
1742                                         d=p;
1743                                         i2d_X509_NAME(name,&p);
1744                                         j-=2; s2n(j,d); j+=2;
1745                                         n+=j;
1746                                         nl+=j;
1747                                         }
1748                                 }
1749                         }
1750                 /* else no CA names */
1751                 p=(unsigned char *)&(buf->data[4+off]);
1752                 s2n(nl,p);
1753
1754                 d=(unsigned char *)buf->data;
1755                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1756                 l2n3(n,d);
1757
1758                 /* we should now have things packed up, so lets send
1759                  * it off */
1760
1761                 s->init_num=n+4;
1762                 s->init_off=0;
1763 #ifdef NETSCAPE_HANG_BUG
1764                 p=(unsigned char *)s->init_buf->data + s->init_num;
1765
1766                 /* do the header */
1767                 *(p++)=SSL3_MT_SERVER_DONE;
1768                 *(p++)=0;
1769                 *(p++)=0;
1770                 *(p++)=0;
1771                 s->init_num += 4;
1772 #endif
1773
1774                 s->state = SSL3_ST_SW_CERT_REQ_B;
1775                 }
1776
1777         /* SSL3_ST_SW_CERT_REQ_B */
1778         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1779 err:
1780         return(-1);
1781         }
1782
1783 int ssl3_get_client_key_exchange(SSL *s)
1784         {
1785         int i,al,ok;
1786         long n;
1787         unsigned long alg_k;
1788         unsigned char *p;
1789 #ifndef OPENSSL_NO_RSA
1790         RSA *rsa=NULL;
1791         EVP_PKEY *pkey=NULL;
1792 #endif
1793 #ifndef OPENSSL_NO_DH
1794         BIGNUM *pub=NULL;
1795         DH *dh_srvr;
1796 #endif
1797 #ifndef OPENSSL_NO_KRB5
1798         KSSL_ERR kssl_err;
1799 #endif /* OPENSSL_NO_KRB5 */
1800
1801 #ifndef OPENSSL_NO_ECDH
1802         EC_KEY *srvr_ecdh = NULL;
1803         EVP_PKEY *clnt_pub_pkey = NULL;
1804         EC_POINT *clnt_ecpoint = NULL;
1805         BN_CTX *bn_ctx = NULL;
1806 #endif
1807
1808         n=s->method->ssl_get_message(s,
1809                 SSL3_ST_SR_KEY_EXCH_A,
1810                 SSL3_ST_SR_KEY_EXCH_B,
1811                 SSL3_MT_CLIENT_KEY_EXCHANGE,
1812                 2048, /* ??? */
1813                 &ok);
1814
1815         if (!ok) return((int)n);
1816         p=(unsigned char *)s->init_msg;
1817
1818         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
1819
1820 #ifndef OPENSSL_NO_RSA
1821         if (alg_k & SSL_kRSA)
1822                 {
1823                 /* FIX THIS UP EAY EAY EAY EAY */
1824                 if (s->s3->tmp.use_rsa_tmp)
1825                         {
1826                         if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
1827                                 rsa=s->cert->rsa_tmp;
1828                         /* Don't do a callback because rsa_tmp should
1829                          * be sent already */
1830                         if (rsa == NULL)
1831                                 {
1832                                 al=SSL_AD_HANDSHAKE_FAILURE;
1833                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
1834                                 goto f_err;
1835
1836                                 }
1837                         }
1838                 else
1839                         {
1840                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
1841                         if (    (pkey == NULL) ||
1842                                 (pkey->type != EVP_PKEY_RSA) ||
1843                                 (pkey->pkey.rsa == NULL))
1844                                 {
1845                                 al=SSL_AD_HANDSHAKE_FAILURE;
1846                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
1847                                 goto f_err;
1848                                 }
1849                         rsa=pkey->pkey.rsa;
1850                         }
1851
1852                 /* TLS and [incidentally] DTLS{0xFEFF} */
1853                 if (s->version > SSL3_VERSION)
1854                         {
1855                         n2s(p,i);
1856                         if (n != i+2)
1857                                 {
1858                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
1859                                         {
1860                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
1861                                         goto err;
1862                                         }
1863                                 else
1864                                         p-=2;
1865                                 }
1866                         else
1867                                 n=i;
1868                         }
1869
1870                 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
1871
1872                 al = -1;
1873
1874                 if (i != SSL_MAX_MASTER_KEY_LENGTH)
1875                         {
1876                         al=SSL_AD_DECODE_ERROR;
1877                         /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT); */
1878                         }
1879
1880                 if ((al == -1) && !((p[0] == (s->client_version>>8)) && (p[1] == (s->client_version & 0xff))))
1881                         {
1882                         /* The premaster secret must contain the same version number as the
1883                          * ClientHello to detect version rollback attacks (strangely, the
1884                          * protocol does not offer such protection for DH ciphersuites).
1885                          * However, buggy clients exist that send the negotiated protocol
1886                          * version instead if the server does not support the requested
1887                          * protocol version.
1888                          * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
1889                         if (!((s->options & SSL_OP_TLS_ROLLBACK_BUG) &&
1890                                 (p[0] == (s->version>>8)) && (p[1] == (s->version & 0xff))))
1891                                 {
1892                                 al=SSL_AD_DECODE_ERROR;
1893                                 /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER); */
1894
1895                                 /* The Klima-Pokorny-Rosa extension of Bleichenbacher's attack
1896                                  * (http://eprint.iacr.org/2003/052/) exploits the version
1897                                  * number check as a "bad version oracle" -- an alert would
1898                                  * reveal that the plaintext corresponding to some ciphertext
1899                                  * made up by the adversary is properly formatted except
1900                                  * that the version number is wrong.  To avoid such attacks,
1901                                  * we should treat this just like any other decryption error. */
1902                                 }
1903                         }
1904
1905                 if (al != -1)
1906                         {
1907                         /* Some decryption failure -- use random value instead as countermeasure
1908                          * against Bleichenbacher's attack on PKCS #1 v1.5 RSA padding
1909                          * (see RFC 2246, section 7.4.7.1). */
1910                         ERR_clear_error();
1911                         i = SSL_MAX_MASTER_KEY_LENGTH;
1912                         p[0] = s->client_version >> 8;
1913                         p[1] = s->client_version & 0xff;
1914                         if (RAND_pseudo_bytes(p+2, i-2) <= 0) /* should be RAND_bytes, but we cannot work around a failure */
1915                                 goto err;
1916                         }
1917
1918                 s->session->master_key_length=
1919                         s->method->ssl3_enc->generate_master_secret(s,
1920                                 s->session->master_key,
1921                                 p,i);
1922                 OPENSSL_cleanse(p,i);
1923                 }
1924         else
1925 #endif
1926 #ifndef OPENSSL_NO_DH
1927                 if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1928                 {
1929                 n2s(p,i);
1930                 if (n != i+2)
1931                         {
1932                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
1933                                 {
1934                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
1935                                 goto err;
1936                                 }
1937                         else
1938                                 {
1939                                 p-=2;
1940                                 i=(int)n;
1941                                 }
1942                         }
1943
1944                 if (n == 0L) /* the parameters are in the cert */
1945                         {
1946                         al=SSL_AD_HANDSHAKE_FAILURE;
1947                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_DECODE_DH_CERTS);
1948                         goto f_err;
1949                         }
1950                 else
1951                         {
1952                         if (s->s3->tmp.dh == NULL)
1953                                 {
1954                                 al=SSL_AD_HANDSHAKE_FAILURE;
1955                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1956                                 goto f_err;
1957                                 }
1958                         else
1959                                 dh_srvr=s->s3->tmp.dh;
1960                         }
1961
1962                 pub=BN_bin2bn(p,i,NULL);
1963                 if (pub == NULL)
1964                         {
1965                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
1966                         goto err;
1967                         }
1968
1969                 i=DH_compute_key(p,pub,dh_srvr);
1970
1971                 if (i <= 0)
1972                         {
1973                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1974                         goto err;
1975                         }
1976
1977                 DH_free(s->s3->tmp.dh);
1978                 s->s3->tmp.dh=NULL;
1979
1980                 BN_clear_free(pub);
1981                 pub=NULL;
1982                 s->session->master_key_length=
1983                         s->method->ssl3_enc->generate_master_secret(s,
1984                                 s->session->master_key,p,i);
1985                 OPENSSL_cleanse(p,i);
1986                 }
1987         else
1988 #endif
1989 #ifndef OPENSSL_NO_KRB5
1990         if (alg_k & SSL_kKRB5)
1991                 {
1992                 krb5_error_code         krb5rc;
1993                 krb5_data               enc_ticket;
1994                 krb5_data               authenticator;
1995                 krb5_data               enc_pms;
1996                 KSSL_CTX                *kssl_ctx = s->kssl_ctx;
1997                 EVP_CIPHER_CTX          ciph_ctx;
1998                 EVP_CIPHER              *enc = NULL;
1999                 unsigned char           iv[EVP_MAX_IV_LENGTH];
2000                 unsigned char           pms[SSL_MAX_MASTER_KEY_LENGTH
2001                                                + EVP_MAX_BLOCK_LENGTH];
2002                 int                  padl, outl;
2003                 krb5_timestamp          authtime = 0;
2004                 krb5_ticket_times       ttimes;
2005
2006                 EVP_CIPHER_CTX_init(&ciph_ctx);
2007
2008                 if (!kssl_ctx)  kssl_ctx = kssl_ctx_new();
2009
2010                 n2s(p,i);
2011                 enc_ticket.length = i;
2012
2013                 if (n < enc_ticket.length + 6)
2014                         {
2015                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2016                                 SSL_R_DATA_LENGTH_TOO_LONG);
2017                         goto err;
2018                         }
2019
2020                 enc_ticket.data = (char *)p;
2021                 p+=enc_ticket.length;
2022
2023                 n2s(p,i);
2024                 authenticator.length = i;
2025
2026                 if (n < enc_ticket.length + authenticator.length + 6)
2027                         {
2028                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2029                                 SSL_R_DATA_LENGTH_TOO_LONG);
2030                         goto err;
2031                         }
2032
2033                 authenticator.data = (char *)p;
2034                 p+=authenticator.length;
2035
2036                 n2s(p,i);
2037                 enc_pms.length = i;
2038                 enc_pms.data = (char *)p;
2039                 p+=enc_pms.length;
2040
2041                 /* Note that the length is checked again below,
2042                 ** after decryption
2043                 */
2044                 if(enc_pms.length > sizeof pms)
2045                         {
2046                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2047                                SSL_R_DATA_LENGTH_TOO_LONG);
2048                         goto err;
2049                         }
2050
2051                 if (n != (long)(enc_ticket.length + authenticator.length +
2052                                                 enc_pms.length + 6))
2053                         {
2054                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2055                                 SSL_R_DATA_LENGTH_TOO_LONG);
2056                         goto err;
2057                         }
2058
2059                 if ((krb5rc = kssl_sget_tkt(kssl_ctx, &enc_ticket, &ttimes,
2060                                         &kssl_err)) != 0)
2061                         {
2062 #ifdef KSSL_DEBUG
2063                         printf("kssl_sget_tkt rtn %d [%d]\n",
2064                                 krb5rc, kssl_err.reason);
2065                         if (kssl_err.text)
2066                                 printf("kssl_err text= %s\n", kssl_err.text);
2067 #endif  /* KSSL_DEBUG */
2068                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2069                                 kssl_err.reason);
2070                         goto err;
2071                         }
2072
2073                 /*  Note: no authenticator is not considered an error,
2074                 **  but will return authtime == 0.
2075                 */
2076                 if ((krb5rc = kssl_check_authent(kssl_ctx, &authenticator,
2077                                         &authtime, &kssl_err)) != 0)
2078                         {
2079 #ifdef KSSL_DEBUG
2080                         printf("kssl_check_authent rtn %d [%d]\n",
2081                                 krb5rc, kssl_err.reason);
2082                         if (kssl_err.text)
2083                                 printf("kssl_err text= %s\n", kssl_err.text);
2084 #endif  /* KSSL_DEBUG */
2085                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2086                                 kssl_err.reason);
2087                         goto err;
2088                         }
2089
2090                 if ((krb5rc = kssl_validate_times(authtime, &ttimes)) != 0)
2091                         {
2092                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, krb5rc);
2093                         goto err;
2094                         }
2095
2096 #ifdef KSSL_DEBUG
2097                 kssl_ctx_show(kssl_ctx);
2098 #endif  /* KSSL_DEBUG */
2099
2100                 enc = kssl_map_enc(kssl_ctx->enctype);
2101                 if (enc == NULL)
2102                     goto err;
2103
2104                 memset(iv, 0, sizeof iv);       /* per RFC 1510 */
2105
2106                 if (!EVP_DecryptInit_ex(&ciph_ctx,enc,NULL,kssl_ctx->key,iv))
2107                         {
2108                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2109                                 SSL_R_DECRYPTION_FAILED);
2110                         goto err;
2111                         }
2112                 if (!EVP_DecryptUpdate(&ciph_ctx, pms,&outl,
2113                                         (unsigned char *)enc_pms.data, enc_pms.length))
2114                         {
2115                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2116                                 SSL_R_DECRYPTION_FAILED);
2117                         goto err;
2118                         }
2119                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2120                         {
2121                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2122                                 SSL_R_DATA_LENGTH_TOO_LONG);
2123                         goto err;
2124                         }
2125                 if (!EVP_DecryptFinal_ex(&ciph_ctx,&(pms[outl]),&padl))
2126                         {
2127                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2128                                 SSL_R_DECRYPTION_FAILED);
2129                         goto err;
2130                         }
2131                 outl += padl;
2132                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2133                         {
2134                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2135                                 SSL_R_DATA_LENGTH_TOO_LONG);
2136                         goto err;
2137                         }
2138                 if (!((p[0] == (s->client_version>>8)) && (p[1] == (s->client_version & 0xff))))
2139                     {
2140                     /* The premaster secret must contain the same version number as the
2141                      * ClientHello to detect version rollback attacks (strangely, the
2142                      * protocol does not offer such protection for DH ciphersuites).
2143                      * However, buggy clients exist that send random bytes instead of
2144                      * the protocol version.
2145                      * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients.
2146                      * (Perhaps we should have a separate BUG value for the Kerberos cipher)
2147                      */
2148                     if (!((s->options & SSL_OP_TLS_ROLLBACK_BUG) &&
2149                            (p[0] == (s->version>>8)) && (p[1] == (s->version & 0xff))))
2150                         {
2151                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2152                                SSL_AD_DECODE_ERROR);
2153                         goto err;
2154                         }
2155                     }
2156
2157                 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2158
2159                 s->session->master_key_length=
2160                         s->method->ssl3_enc->generate_master_secret(s,
2161                                 s->session->master_key, pms, outl);
2162
2163                 if (kssl_ctx->client_princ)
2164                         {
2165                         size_t len = strlen(kssl_ctx->client_princ);
2166                         if ( len < SSL_MAX_KRB5_PRINCIPAL_LENGTH )
2167                                 {
2168                                 s->session->krb5_client_princ_len = len;
2169                                 memcpy(s->session->krb5_client_princ,kssl_ctx->client_princ,len);
2170                                 }
2171                         }
2172
2173
2174                 /*  Was doing kssl_ctx_free() here,
2175                 **  but it caused problems for apache.
2176                 **  kssl_ctx = kssl_ctx_free(kssl_ctx);
2177                 **  if (s->kssl_ctx)  s->kssl_ctx = NULL;
2178                 */
2179                 }
2180         else
2181 #endif  /* OPENSSL_NO_KRB5 */
2182
2183 #ifndef OPENSSL_NO_ECDH
2184                 if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2185                 {
2186                 int ret = 1;
2187                 int field_size = 0;
2188                 const EC_KEY   *tkey;
2189                 const EC_GROUP *group;
2190                 const BIGNUM *priv_key;
2191
2192                 /* initialize structures for server's ECDH key pair */
2193                 if ((srvr_ecdh = EC_KEY_new()) == NULL)
2194                         {
2195                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2196                             ERR_R_MALLOC_FAILURE);
2197                         goto err;
2198                         }
2199
2200                 /* Let's get server private key and group information */
2201                 if (alg_k & (SSL_kECDHr|SSL_kECDHe))
2202                         {
2203                         /* use the certificate */
2204                         tkey = s->cert->pkeys[SSL_PKEY_ECC].privatekey->pkey.ec;
2205                         }
2206                 else
2207                         {
2208                         /* use the ephermeral values we saved when
2209                          * generating the ServerKeyExchange msg.
2210                          */
2211                         tkey = s->s3->tmp.ecdh;
2212                         }
2213
2214                 group    = EC_KEY_get0_group(tkey);
2215                 priv_key = EC_KEY_get0_private_key(tkey);
2216
2217                 if (!EC_KEY_set_group(srvr_ecdh, group) ||
2218                     !EC_KEY_set_private_key(srvr_ecdh, priv_key))
2219                         {
2220                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2221                                ERR_R_EC_LIB);
2222                         goto err;
2223                         }
2224
2225                 /* Let's get client's public key */
2226                 if ((clnt_ecpoint = EC_POINT_new(group)) == NULL)
2227                         {
2228                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2229                             ERR_R_MALLOC_FAILURE);
2230                         goto err;
2231                         }
2232
2233                 if (n == 0L)
2234                         {
2235                         /* Client Publickey was in Client Certificate */
2236
2237                          if (alg_k & SSL_kEECDH)
2238                                  {
2239                                  al=SSL_AD_HANDSHAKE_FAILURE;
2240                                  SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
2241                                  goto f_err;
2242                                  }
2243                         if (((clnt_pub_pkey=X509_get_pubkey(s->session->peer))
2244                             == NULL) ||
2245                             (clnt_pub_pkey->type != EVP_PKEY_EC))
2246                                 {
2247                                 /* XXX: For now, we do not support client
2248                                  * authentication using ECDH certificates
2249                                  * so this branch (n == 0L) of the code is
2250                                  * never executed. When that support is
2251                                  * added, we ought to ensure the key
2252                                  * received in the certificate is
2253                                  * authorized for key agreement.
2254                                  * ECDH_compute_key implicitly checks that
2255                                  * the two ECDH shares are for the same
2256                                  * group.
2257                                  */
2258                                 al=SSL_AD_HANDSHAKE_FAILURE;
2259                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2260                                     SSL_R_UNABLE_TO_DECODE_ECDH_CERTS);
2261                                 goto f_err;
2262                                 }
2263
2264                         if (EC_POINT_copy(clnt_ecpoint,
2265                             EC_KEY_get0_public_key(clnt_pub_pkey->pkey.ec)) == 0)
2266                                 {
2267                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2268                                         ERR_R_EC_LIB);
2269                                 goto err;
2270                                 }
2271                         ret = 2; /* Skip certificate verify processing */
2272                         }
2273                 else
2274                         {
2275                         /* Get client's public key from encoded point
2276                          * in the ClientKeyExchange message.
2277                          */
2278                         if ((bn_ctx = BN_CTX_new()) == NULL)
2279                                 {
2280                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2281                                     ERR_R_MALLOC_FAILURE);
2282                                 goto err;
2283                                 }
2284
2285                         /* Get encoded point length */
2286                         i = *p;
2287                         p += 1;
2288                         if (EC_POINT_oct2point(group,
2289                             clnt_ecpoint, p, i, bn_ctx) == 0)
2290                                 {
2291                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2292                                     ERR_R_EC_LIB);
2293                                 goto err;
2294                                 }
2295                         /* p is pointing to somewhere in the buffer
2296                          * currently, so set it to the start
2297                          */
2298                         p=(unsigned char *)s->init_buf->data;
2299                         }
2300
2301                 /* Compute the shared pre-master secret */
2302                 field_size = EC_GROUP_get_degree(group);
2303                 if (field_size <= 0)
2304                         {
2305                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2306                                ERR_R_ECDH_LIB);
2307                         goto err;
2308                         }
2309                 i = ECDH_compute_key(p, (field_size+7)/8, clnt_ecpoint, srvr_ecdh, NULL);
2310                 if (i <= 0)
2311                         {
2312                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2313                             ERR_R_ECDH_LIB);
2314                         goto err;
2315                         }
2316
2317                 EVP_PKEY_free(clnt_pub_pkey);
2318                 EC_POINT_free(clnt_ecpoint);
2319                 if (srvr_ecdh != NULL)
2320                         EC_KEY_free(srvr_ecdh);
2321                 BN_CTX_free(bn_ctx);
2322
2323                 /* Compute the master secret */
2324                 s->session->master_key_length = s->method->ssl3_enc-> \
2325                     generate_master_secret(s, s->session->master_key, p, i);
2326
2327                 OPENSSL_cleanse(p, i);
2328                 return (ret);
2329                 }
2330         else
2331 #endif
2332 #ifndef OPENSSL_NO_PSK
2333                 if (alg_k & SSL_kPSK)
2334                         {
2335                         unsigned char *t = NULL;
2336                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
2337                         unsigned int pre_ms_len = 0, psk_len = 0;
2338                         int psk_err = 1;
2339                         char tmp_id[PSK_MAX_IDENTITY_LEN+1];
2340
2341                         al=SSL_AD_HANDSHAKE_FAILURE;
2342
2343                         n2s(p,i);
2344                         if (n != i+2)
2345                                 {
2346                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2347                                         SSL_R_LENGTH_MISMATCH);
2348                                 goto psk_err;
2349                                 }
2350                         if (i > PSK_MAX_IDENTITY_LEN)
2351                                 {
2352                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2353                                         SSL_R_DATA_LENGTH_TOO_LONG);
2354                                 goto psk_err;
2355                                 }
2356                         if (s->psk_server_callback == NULL)
2357                                 {
2358                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2359                                        SSL_R_PSK_NO_SERVER_CB);
2360                                 goto psk_err;
2361                                 }
2362
2363                         /* Create guaranteed NULL-terminated identity
2364                          * string for the callback */
2365                         memcpy(tmp_id, p, i);
2366                         memset(tmp_id+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
2367                         psk_len = s->psk_server_callback(s, tmp_id,
2368                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
2369                         OPENSSL_cleanse(tmp_id, PSK_MAX_IDENTITY_LEN+1);
2370
2371                         if (psk_len > PSK_MAX_PSK_LEN)
2372                                 {
2373                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2374                                         ERR_R_INTERNAL_ERROR);
2375                                 goto psk_err;
2376                                 }
2377                         else if (psk_len == 0)
2378                                 {
2379                                 /* PSK related to the given identity not found */
2380                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2381                                        SSL_R_PSK_IDENTITY_NOT_FOUND);
2382                                 al=SSL_AD_UNKNOWN_PSK_IDENTITY;
2383                                 goto psk_err;
2384                                 }
2385
2386                         /* create PSK pre_master_secret */
2387                         pre_ms_len=2+psk_len+2+psk_len;
2388                         t = psk_or_pre_ms;
2389                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
2390                         s2n(psk_len, t);
2391                         memset(t, 0, psk_len);
2392                         t+=psk_len;
2393                         s2n(psk_len, t);
2394
2395                         if (s->session->psk_identity != NULL)
2396                                 OPENSSL_free(s->session->psk_identity);
2397                         s->session->psk_identity = BUF_strdup((char *)p);
2398                         if (s->session->psk_identity == NULL)
2399                                 {
2400                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2401                                         ERR_R_MALLOC_FAILURE);
2402                                 goto psk_err;
2403                                 }
2404
2405                         if (s->session->psk_identity_hint != NULL)
2406                                 OPENSSL_free(s->session->psk_identity_hint);
2407                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
2408                         if (s->ctx->psk_identity_hint != NULL &&
2409                                 s->session->psk_identity_hint == NULL)
2410                                 {
2411                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2412                                         ERR_R_MALLOC_FAILURE);
2413                                 goto psk_err;
2414                                 }
2415
2416                         s->session->master_key_length=
2417                                 s->method->ssl3_enc->generate_master_secret(s,
2418                                         s->session->master_key, psk_or_pre_ms, pre_ms_len);
2419                         psk_err = 0;
2420                 psk_err:
2421                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
2422                         if (psk_err != 0)
2423                                 goto f_err;
2424                         }
2425                 else
2426 #endif
2427                 if (alg_k & SSL_kGOST)
2428                 {
2429                         EVP_PKEY_CTX *pkey_ctx;
2430                         unsigned char premaster_secret[32];
2431                         size_t outlen;
2432
2433                         /* Get our certificate privatec key*/
2434                         pkey_ctx = EVP_PKEY_CTX_new(s->cert->key->privatekey,NULL);
2435                         EVP_PKEY_decrypt_init(pkey_ctx);
2436                         /* Decrypt session key */
2437                         if ((*p!=( V_ASN1_SEQUENCE| V_ASN1_CONSTRUCTED)) || p[1]!=0x81 )
2438                                 {
2439                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2440                                 goto err;
2441                                 }
2442                         if (EVP_PKEY_decrypt(pkey_ctx,premaster_secret,&outlen,p+3,p[2]) <0)
2443
2444                                 {
2445                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2446                                 goto err;
2447                                 }
2448                         /* Generate master secret */
2449                         EVP_PKEY_CTX_free(pkey_ctx);
2450                         s->session->master_key_length=
2451                                 s->method->ssl3_enc->generate_master_secret(s,
2452                                         s->session->master_key,premaster_secret,32);
2453
2454                 }
2455                 else
2456                 {
2457                 al=SSL_AD_HANDSHAKE_FAILURE;
2458                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2459                                 SSL_R_UNKNOWN_CIPHER_TYPE);
2460                 goto f_err;
2461                 }
2462
2463         return(1);
2464 f_err:
2465         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2466 #if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA) || !defined(OPENSSL_NO_ECDH)
2467 err:
2468 #endif
2469 #ifndef OPENSSL_NO_ECDH
2470         EVP_PKEY_free(clnt_pub_pkey);
2471         EC_POINT_free(clnt_ecpoint);
2472         if (srvr_ecdh != NULL)
2473                 EC_KEY_free(srvr_ecdh);
2474         BN_CTX_free(bn_ctx);
2475 #endif
2476         return(-1);
2477         }
2478
2479 int ssl3_get_cert_verify(SSL *s)
2480         {
2481         EVP_PKEY *pkey=NULL;
2482         unsigned char *p;
2483         int al,ok,ret=0;
2484         long n;
2485         int type=0,i,j;
2486         X509 *peer;
2487
2488         n=s->method->ssl_get_message(s,
2489                 SSL3_ST_SR_CERT_VRFY_A,
2490                 SSL3_ST_SR_CERT_VRFY_B,
2491                 -1,
2492                 514, /* 514? */
2493                 &ok);
2494
2495         if (!ok) return((int)n);
2496
2497         if (s->session->peer != NULL)
2498                 {
2499                 peer=s->session->peer;
2500                 pkey=X509_get_pubkey(peer);
2501                 type=X509_certificate_type(peer,pkey);
2502                 }
2503         else
2504                 {
2505                 peer=NULL;
2506                 pkey=NULL;
2507                 }
2508
2509         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
2510                 {
2511                 s->s3->tmp.reuse_message=1;
2512                 if ((peer != NULL) && (type | EVP_PKT_SIGN))
2513                         {
2514                         al=SSL_AD_UNEXPECTED_MESSAGE;
2515                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
2516                         goto f_err;
2517                         }
2518                 ret=1;
2519                 goto end;
2520                 }
2521
2522         if (peer == NULL)
2523                 {
2524                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
2525                 al=SSL_AD_UNEXPECTED_MESSAGE;
2526                 goto f_err;
2527                 }
2528
2529         if (!(type & EVP_PKT_SIGN))
2530                 {
2531                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
2532                 al=SSL_AD_ILLEGAL_PARAMETER;
2533                 goto f_err;
2534                 }
2535
2536         if (s->s3->change_cipher_spec)
2537                 {
2538                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
2539                 al=SSL_AD_UNEXPECTED_MESSAGE;
2540                 goto f_err;
2541                 }
2542
2543         /* we now have a signature that we need to verify */
2544         p=(unsigned char *)s->init_msg;
2545         /* Check for broken implementations of GOST ciphersuites */
2546         /* If key is GOST and n is exactly 64, it is bare
2547          * signature without length field */
2548         if (n==64 && (pkey->type==NID_id_GostR3410_94 ||
2549                 pkey->type == NID_id_GostR3410_2001) )
2550                 {
2551                 i=64;
2552                 }
2553         else
2554                 {
2555                 n2s(p,i);
2556                 n-=2;
2557                 if (i > n)
2558                         {
2559                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
2560                         al=SSL_AD_DECODE_ERROR;
2561                         goto f_err;
2562                         }
2563         }
2564         j=EVP_PKEY_size(pkey);
2565         if ((i > j) || (n > j) || (n <= 0))
2566                 {
2567                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
2568                 al=SSL_AD_DECODE_ERROR;
2569                 goto f_err;
2570                 }
2571
2572 #ifndef OPENSSL_NO_RSA
2573         if (pkey->type == EVP_PKEY_RSA)
2574                 {
2575                 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
2576                         MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i,
2577                                                         pkey->pkey.rsa);
2578                 if (i < 0)
2579                         {
2580                         al=SSL_AD_DECRYPT_ERROR;
2581                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
2582                         goto f_err;
2583                         }
2584                 if (i == 0)
2585                         {
2586                         al=SSL_AD_DECRYPT_ERROR;
2587                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
2588                         goto f_err;
2589                         }
2590                 }
2591         else
2592 #endif
2593 #ifndef OPENSSL_NO_DSA
2594                 if (pkey->type == EVP_PKEY_DSA)
2595                 {
2596                 j=DSA_verify(pkey->save_type,
2597                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
2598                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
2599                 if (j <= 0)
2600                         {
2601                         /* bad signature */
2602                         al=SSL_AD_DECRYPT_ERROR;
2603                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
2604                         goto f_err;
2605                         }
2606                 }
2607         else
2608 #endif
2609 #ifndef OPENSSL_NO_ECDSA
2610                 if (pkey->type == EVP_PKEY_EC)
2611                 {
2612                 j=ECDSA_verify(pkey->save_type,
2613                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
2614                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.ec);
2615                 if (j <= 0)
2616                         {
2617                         /* bad signature */
2618                         al=SSL_AD_DECRYPT_ERROR;
2619                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
2620                             SSL_R_BAD_ECDSA_SIGNATURE);
2621                         goto f_err;
2622                         }
2623                 }
2624         else
2625 #endif
2626         if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001)
2627                 {   unsigned char signature[64];
2628                         int idx;
2629                         EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new(pkey,NULL);
2630                         EVP_PKEY_verify_init(pctx);
2631                         if (i!=64) {
2632                                 fprintf(stderr,"GOST signature length is %d",i);
2633                         }
2634                         for (idx=0;idx<64;idx++) {
2635                                 signature[63-idx]=p[idx];
2636                         }
2637                         j=EVP_PKEY_verify(pctx,signature,64,s->s3->tmp.cert_verify_md,32);
2638                         EVP_PKEY_CTX_free(pctx);
2639                         if (j<=0)
2640                                 {
2641                                 al=SSL_AD_DECRYPT_ERROR;
2642                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
2643                                         SSL_R_BAD_ECDSA_SIGNATURE);
2644                                 goto f_err;
2645                                 }
2646                 }
2647         else
2648                 {
2649                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
2650                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
2651                 goto f_err;
2652                 }
2653
2654
2655         ret=1;
2656         if (0)
2657                 {
2658 f_err:
2659                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2660                 }
2661 end:
2662         EVP_PKEY_free(pkey);
2663         return(ret);
2664         }
2665
2666 int ssl3_get_client_certificate(SSL *s)
2667         {
2668         int i,ok,al,ret= -1;
2669         X509 *x=NULL;
2670         unsigned long l,nc,llen,n;
2671         const unsigned char *p,*q;
2672         unsigned char *d;
2673         STACK_OF(X509) *sk=NULL;
2674
2675         n=s->method->ssl_get_message(s,
2676                 SSL3_ST_SR_CERT_A,
2677                 SSL3_ST_SR_CERT_B,
2678                 -1,
2679                 s->max_cert_list,
2680                 &ok);
2681
2682         if (!ok) return((int)n);
2683
2684         if      (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
2685                 {
2686                 if (    (s->verify_mode & SSL_VERIFY_PEER) &&
2687                         (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
2688                         {
2689                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
2690                         al=SSL_AD_HANDSHAKE_FAILURE;
2691                         goto f_err;
2692                         }
2693                 /* If tls asked for a client cert, the client must return a 0 list */
2694                 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
2695                         {
2696                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
2697                         al=SSL_AD_UNEXPECTED_MESSAGE;
2698                         goto f_err;
2699                         }
2700                 s->s3->tmp.reuse_message=1;
2701                 return(1);
2702                 }
2703
2704         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
2705                 {
2706                 al=SSL_AD_UNEXPECTED_MESSAGE;
2707                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
2708                 goto f_err;
2709                 }
2710         p=d=(unsigned char *)s->init_msg;
2711
2712         if ((sk=sk_X509_new_null()) == NULL)
2713                 {
2714                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
2715                 goto err;
2716                 }
2717
2718         n2l3(p,llen);
2719         if (llen+3 != n)
2720                 {
2721                 al=SSL_AD_DECODE_ERROR;
2722                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
2723                 goto f_err;
2724                 }
2725         for (nc=0; nc<llen; )
2726                 {
2727                 n2l3(p,l);
2728                 if ((l+nc+3) > llen)
2729                         {
2730                         al=SSL_AD_DECODE_ERROR;
2731                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
2732                         goto f_err;
2733                         }
2734
2735                 q=p;
2736                 x=d2i_X509(NULL,&p,l);
2737                 if (x == NULL)
2738                         {
2739                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
2740                         goto err;
2741                         }
2742                 if (p != (q+l))
2743                         {
2744                         al=SSL_AD_DECODE_ERROR;
2745                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
2746                         goto f_err;
2747                         }
2748                 if (!sk_X509_push(sk,x))
2749                         {
2750                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
2751                         goto err;
2752                         }
2753                 x=NULL;
2754                 nc+=l+3;
2755                 }
2756
2757         if (sk_X509_num(sk) <= 0)
2758                 {
2759                 /* TLS does not mind 0 certs returned */
2760                 if (s->version == SSL3_VERSION)
2761                         {
2762                         al=SSL_AD_HANDSHAKE_FAILURE;
2763                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
2764                         goto f_err;
2765                         }
2766                 /* Fail for TLS only if we required a certificate */
2767                 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
2768                          (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
2769                         {
2770                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
2771                         al=SSL_AD_HANDSHAKE_FAILURE;
2772                         goto f_err;
2773                         }
2774                 }
2775         else
2776                 {
2777                 i=ssl_verify_cert_chain(s,sk);
2778                 if (!i)
2779                         {
2780                         al=ssl_verify_alarm_type(s->verify_result);
2781                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED);
2782                         goto f_err;
2783                         }
2784                 }
2785
2786         if (s->session->peer != NULL) /* This should not be needed */
2787                 X509_free(s->session->peer);
2788         s->session->peer=sk_X509_shift(sk);
2789         s->session->verify_result = s->verify_result;
2790
2791         /* With the current implementation, sess_cert will always be NULL
2792          * when we arrive here. */
2793         if (s->session->sess_cert == NULL)
2794                 {
2795                 s->session->sess_cert = ssl_sess_cert_new();
2796                 if (s->session->sess_cert == NULL)
2797                         {
2798                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
2799                         goto err;
2800                         }
2801                 }
2802         if (s->session->sess_cert->cert_chain != NULL)
2803                 sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free);
2804         s->session->sess_cert->cert_chain=sk;
2805         /* Inconsistency alert: cert_chain does *not* include the
2806          * peer's own certificate, while we do include it in s3_clnt.c */
2807
2808         sk=NULL;
2809
2810         ret=1;
2811         if (0)
2812                 {
2813 f_err:
2814                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2815                 }
2816 err:
2817         if (x != NULL) X509_free(x);
2818         if (sk != NULL) sk_X509_pop_free(sk,X509_free);
2819         return(ret);
2820         }
2821
2822 int ssl3_send_server_certificate(SSL *s)
2823         {
2824         unsigned long l;
2825         X509 *x;
2826
2827         if (s->state == SSL3_ST_SW_CERT_A)
2828                 {
2829                 x=ssl_get_server_send_cert(s);
2830                 if (x == NULL)
2831                         {
2832                         /* VRS: allow null cert if auth == KRB5 */
2833                         if ((s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5) ||
2834                             (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5))
2835                                 {
2836                                 SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
2837                                 return(0);
2838                                 }
2839                         }
2840
2841                 l=ssl3_output_cert_chain(s,x);
2842                 s->state=SSL3_ST_SW_CERT_B;
2843                 s->init_num=(int)l;
2844                 s->init_off=0;
2845                 }
2846
2847         /* SSL3_ST_SW_CERT_B */
2848         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2849         }
2850 #ifndef OPENSSL_NO_TLSEXT
2851 int ssl3_send_newsession_ticket(SSL *s)
2852         {
2853         if (s->state == SSL3_ST_SW_SESSION_TICKET_A)
2854                 {
2855                 unsigned char *p, *senc, *macstart;
2856                 int len, slen;
2857                 unsigned int hlen;
2858                 EVP_CIPHER_CTX ctx;
2859                 HMAC_CTX hctx;
2860                 unsigned char iv[EVP_MAX_IV_LENGTH];
2861                 unsigned char key_name[16];
2862
2863                 /* get session encoding length */
2864                 slen = i2d_SSL_SESSION(s->session, NULL);
2865                 /* Some length values are 16 bits, so forget it if session is
2866                  * too long
2867                  */
2868                 if (slen > 0xFF00)
2869                         return -1;
2870                 /* Grow buffer if need be: the length calculation is as
2871                  * follows 1 (size of message name) + 3 (message length
2872                  * bytes) + 4 (ticket lifetime hint) + 2 (ticket length) +
2873                  * 16 (key name) + max_iv_len (iv length) +
2874                  * session_length + max_enc_block_size (max encrypted session
2875                  * length) + max_md_size (HMAC).
2876                  */
2877                 if (!BUF_MEM_grow(s->init_buf,
2878                         26 + EVP_MAX_IV_LENGTH + EVP_MAX_BLOCK_LENGTH +
2879                         EVP_MAX_MD_SIZE + slen))
2880                         return -1;
2881                 senc = OPENSSL_malloc(slen);
2882                 if (!senc)
2883                         return -1;
2884                 p = senc;
2885                 i2d_SSL_SESSION(s->session, &p);
2886
2887                 p=(unsigned char *)s->init_buf->data;
2888                 /* do the header */
2889                 *(p++)=SSL3_MT_NEWSESSION_TICKET;
2890                 /* Skip message length for now */
2891                 p += 3;
2892                 EVP_CIPHER_CTX_init(&ctx);
2893                 HMAC_CTX_init(&hctx);
2894                 /* Initialize HMAC and cipher contexts. If callback present
2895                  * it does all the work otherwise use generated values
2896                  * from parent ctx.
2897                  */
2898                 if (s->ctx->tlsext_ticket_key_cb)
2899                         {
2900                         if (s->ctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx,
2901                                                          &hctx, 1) < 0)
2902                                 {
2903                                 OPENSSL_free(senc);
2904                                 return -1;
2905                                 }
2906                         }
2907                 else
2908                         {
2909                         RAND_pseudo_bytes(iv, 16);
2910                         EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
2911                                         s->ctx->tlsext_tick_aes_key, iv);
2912                         HMAC_Init_ex(&hctx, s->ctx->tlsext_tick_hmac_key, 16,
2913                                         tlsext_tick_md(), NULL);
2914                         memcpy(key_name, s->ctx->tlsext_tick_key_name, 16);
2915                         }
2916                 l2n(s->session->tlsext_tick_lifetime_hint, p);
2917                 /* Skip ticket length for now */
2918                 p += 2;
2919                 /* Output key name */
2920                 macstart = p;
2921                 memcpy(p, key_name, 16);
2922                 p += 16;
2923                 /* output IV */
2924                 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
2925                 p += EVP_CIPHER_CTX_iv_length(&ctx);
2926                 /* Encrypt session data */
2927                 EVP_EncryptUpdate(&ctx, p, &len, senc, slen);
2928                 p += len;
2929                 EVP_EncryptFinal(&ctx, p, &len);
2930                 p += len;
2931                 EVP_CIPHER_CTX_cleanup(&ctx);
2932
2933                 HMAC_Update(&hctx, macstart, p - macstart);
2934                 HMAC_Final(&hctx, p, &hlen);
2935                 HMAC_CTX_cleanup(&hctx);
2936
2937                 p += hlen;
2938                 /* Now write out lengths: p points to end of data written */
2939                 /* Total length */
2940                 len = p - (unsigned char *)s->init_buf->data;
2941                 p=(unsigned char *)s->init_buf->data + 1;
2942                 l2n3(len - 4, p); /* Message length */
2943                 p += 4;
2944                 s2n(len - 10, p);  /* Ticket length */
2945
2946                 /* number of bytes to write */
2947                 s->init_num= len;
2948                 s->state=SSL3_ST_SW_SESSION_TICKET_B;
2949                 s->init_off=0;
2950                 OPENSSL_free(senc);
2951                 }
2952
2953         /* SSL3_ST_SW_SESSION_TICKET_B */
2954         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2955         }
2956
2957 int ssl3_send_cert_status(SSL *s)
2958         {
2959         if (s->state == SSL3_ST_SW_CERT_STATUS_A)
2960                 {
2961                 unsigned char *p;
2962                 /* Grow buffer if need be: the length calculation is as
2963                  * follows 1 (message type) + 3 (message length) +
2964                  * 1 (ocsp response type) + 3 (ocsp response length)
2965                  * + (ocsp response)
2966                  */
2967                 if (!BUF_MEM_grow(s->init_buf, 8 + s->tlsext_ocsp_resplen))
2968                         return -1;
2969
2970                 p=(unsigned char *)s->init_buf->data;
2971
2972                 /* do the header */
2973                 *(p++)=SSL3_MT_CERTIFICATE_STATUS;
2974                 /* message length */
2975                 l2n3(s->tlsext_ocsp_resplen + 4, p);
2976                 /* status type */
2977                 *(p++)= s->tlsext_status_type;
2978                 /* length of OCSP response */
2979                 l2n3(s->tlsext_ocsp_resplen, p);
2980                 /* actual response */
2981                 memcpy(p, s->tlsext_ocsp_resp, s->tlsext_ocsp_resplen);
2982                 /* number of bytes to write */
2983                 s->init_num = 8 + s->tlsext_ocsp_resplen;
2984                 s->state=SSL3_ST_SW_CERT_STATUS_B;
2985                 s->init_off = 0;
2986                 }
2987
2988         /* SSL3_ST_SW_CERT_STATUS_B */
2989         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2990         }
2991 #endif