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)
 951                         {
 952                         if ((s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
 953                                 {
 954                                 /* Very bad for multi-threading.... */
 955                                 s->session->cipher=sk_SSL_CIPHER_value(ciphers, 0);
 956                                 }
 957                         else
 958                                 {
 959                                 /* we need to have the cipher in the cipher
 960                                  * list if we are asked to reuse it */
 961                                 al=SSL_AD_ILLEGAL_PARAMETER;
 962                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
 963                                 goto f_err;
 964                                 }
 965                         }
 966                 }
 967
 968         /* compression */
 969         i= *(p++);
 970         if ((p+i) > (d+n))
 971                 {
 972                 /* not enough data */
 973                 al=SSL_AD_DECODE_ERROR;
 974                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 975                 goto f_err;
 976                 }
 977         q=p;
 978         for (j=0; j<i; j++)
 979                 {
 980                 if (p[j] == 0) break;
 981                 }
 982
 983         p+=i;
 984         if (j >= i)
 985                 {
 986                 /* no compress */
 987                 al=SSL_AD_DECODE_ERROR;
 988                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
 989                 goto f_err;
 990                 }
 991
 992 #ifndef OPENSSL_NO_TLSEXT
 993         /* TLS extensions*/
 994         if (s->version > SSL3_VERSION)
 995                 {
 996                 if (!ssl_parse_clienthello_tlsext(s,&p,d,n, &al))
 997                         {
 998                         /* 'al' set by ssl_parse_clienthello_tlsext */
 999                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_PARSE_TLSEXT);
1000                         goto f_err;
1001                         }
1002                 }
1003                 if (ssl_check_clienthello_tlsext(s) <= 0) {
1004                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
1005                         goto err;
1006                 }
1007 #endif
1008
1009         /* Worst case, we will use the NULL compression, but if we have other
1010          * options, we will now look for them.  We have i-1 compression
1011          * algorithms from the client, starting at q. */
1012         s->s3->tmp.new_compression=NULL;
1013 #ifndef OPENSSL_NO_COMP
1014         if (!(s->options & SSL_OP_NO_COMPRESSION) && s->ctx->comp_methods)
1015                 { /* See if we have a match */
1016                 int m,nn,o,v,done=0;
1017
1018                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
1019                 for (m=0; m<nn; m++)
1020                         {
1021                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1022                         v=comp->id;
1023                         for (o=0; o<i; o++)
1024                                 {
1025                                 if (v == q[o])
1026                                         {
1027                                         done=1;
1028                                         break;
1029                                         }
1030                                 }
1031                         if (done) break;
1032                         }
1033                 if (done)
1034                         s->s3->tmp.new_compression=comp;
1035                 else
1036                         comp=NULL;
1037                 }
1038 #endif
1039
1040         /* Given s->session->ciphers and SSL_get_ciphers, we must
1041          * pick a cipher */
1042
1043         if (!s->hit)
1044                 {
1045 #ifdef OPENSSL_NO_COMP
1046                 s->session->compress_meth=0;
1047 #else
1048                 s->session->compress_meth=(comp == NULL)?0:comp->id;
1049 #endif
1050                 if (s->session->ciphers != NULL)
1051                         sk_SSL_CIPHER_free(s->session->ciphers);
1052                 s->session->ciphers=ciphers;
1053                 if (ciphers == NULL)
1054                         {
1055                         al=SSL_AD_ILLEGAL_PARAMETER;
1056                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
1057                         goto f_err;
1058                         }
1059                 ciphers=NULL;
1060                 c=ssl3_choose_cipher(s,s->session->ciphers,
1061                                      SSL_get_ciphers(s));
1062
1063                 if (c == NULL)
1064                         {
1065                         al=SSL_AD_HANDSHAKE_FAILURE;
1066                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1067                         goto f_err;
1068                         }
1069                 s->s3->tmp.new_cipher=c;
1070                 }
1071         else
1072                 {
1073                 /* Session-id reuse */
1074 #ifdef REUSE_CIPHER_BUG
1075                 STACK_OF(SSL_CIPHER) *sk;
1076                 SSL_CIPHER *nc=NULL;
1077                 SSL_CIPHER *ec=NULL;
1078
1079                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
1080                         {
1081                         sk=s->session->ciphers;
1082                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
1083                                 {
1084                                 c=sk_SSL_CIPHER_value(sk,i);
1085                                 if (c->algorithm_enc & SSL_eNULL)
1086                                         nc=c;
1087                                 if (SSL_C_IS_EXPORT(c))
1088                                         ec=c;
1089                                 }
1090                         if (nc != NULL)
1091                                 s->s3->tmp.new_cipher=nc;
1092                         else if (ec != NULL)
1093                                 s->s3->tmp.new_cipher=ec;
1094                         else
1095                                 s->s3->tmp.new_cipher=s->session->cipher;
1096                         }
1097                 else
1098 #endif
1099                 s->s3->tmp.new_cipher=s->session->cipher;
1100                 }
1101
1102         ssl3_digest_cached_records(s);
1103
1104         /* we now have the following setup.
1105          * client_random
1106          * cipher_list          - our prefered list of ciphers
1107          * ciphers              - the clients prefered list of ciphers
1108          * compression          - basically ignored right now
1109          * ssl version is set   - sslv3
1110          * s->session           - The ssl session has been setup.
1111          * s->hit               - session reuse flag
1112          * s->tmp.new_cipher    - the new cipher to use.
1113          */
1114
1115         ret=1;
1116         if (0)
1117                 {
1118 f_err:
1119                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1120                 }
1121 err:
1122         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
1123         return(ret);
1124         }
1125
1126 int ssl3_send_server_hello(SSL *s)
1127         {
1128         unsigned char *buf;
1129         unsigned char *p,*d;
1130         int i,sl;
1131         unsigned long l,Time;
1132
1133         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
1134                 {
1135                 buf=(unsigned char *)s->init_buf->data;
1136                 p=s->s3->server_random;
1137                 Time=(unsigned long)time(NULL);                 /* Time */
1138                 l2n(Time,p);
1139                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
1140                         return -1;
1141                 /* Do the message type and length last */
1142                 d=p= &(buf[4]);
1143
1144                 *(p++)=s->version>>8;
1145                 *(p++)=s->version&0xff;
1146
1147                 /* Random stuff */
1148                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
1149                 p+=SSL3_RANDOM_SIZE;
1150
1151                 /* now in theory we have 3 options to sending back the
1152                  * session id.  If it is a re-use, we send back the
1153                  * old session-id, if it is a new session, we send
1154                  * back the new session-id or we send back a 0 length
1155                  * session-id if we want it to be single use.
1156                  * Currently I will not implement the '0' length session-id
1157                  * 12-Jan-98 - I'll now support the '0' length stuff.
1158                  *
1159                  * We also have an additional case where stateless session
1160                  * resumption is successful: we always send back the old
1161                  * session id. In this case s->hit is non zero: this can
1162                  * only happen if stateless session resumption is succesful
1163                  * if session caching is disabled so existing functionality
1164                  * is unaffected.
1165                  */
1166                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)
1167                         && !s->hit)
1168                         s->session->session_id_length=0;
1169
1170                 sl=s->session->session_id_length;
1171                 if (sl > (int)sizeof(s->session->session_id))
1172                         {
1173                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1174                         return -1;
1175                         }
1176                 *(p++)=sl;
1177                 memcpy(p,s->session->session_id,sl);
1178                 p+=sl;
1179
1180                 /* put the cipher */
1181                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
1182                 p+=i;
1183
1184                 /* put the compression method */
1185 #ifdef OPENSSL_NO_COMP
1186                         *(p++)=0;
1187 #else
1188                 if (s->s3->tmp.new_compression == NULL)
1189                         *(p++)=0;
1190                 else
1191                         *(p++)=s->s3->tmp.new_compression->id;
1192 #endif
1193 #ifndef OPENSSL_NO_TLSEXT
1194                 if (ssl_prepare_serverhello_tlsext(s) <= 0)
1195                         {
1196                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
1197                         return -1;
1198                         }
1199                 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
1200                         {
1201                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
1202                         return -1;
1203                         }
1204 #endif
1205                 /* do the header */
1206                 l=(p-d);
1207                 d=buf;
1208                 *(d++)=SSL3_MT_SERVER_HELLO;
1209                 l2n3(l,d);
1210
1211                 s->state=SSL3_ST_SW_CLNT_HELLO_B;
1212                 /* number of bytes to write */
1213                 s->init_num=p-buf;
1214                 s->init_off=0;
1215                 }
1216
1217         /* SSL3_ST_SW_CLNT_HELLO_B */
1218         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1219         }
1220
1221 int ssl3_send_server_done(SSL *s)
1222         {
1223         unsigned char *p;
1224
1225         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1226                 {
1227                 p=(unsigned char *)s->init_buf->data;
1228
1229                 /* do the header */
1230                 *(p++)=SSL3_MT_SERVER_DONE;
1231                 *(p++)=0;
1232                 *(p++)=0;
1233                 *(p++)=0;
1234
1235                 s->state=SSL3_ST_SW_SRVR_DONE_B;
1236                 /* number of bytes to write */
1237                 s->init_num=4;
1238                 s->init_off=0;
1239                 }
1240
1241         /* SSL3_ST_SW_SRVR_DONE_B */
1242         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1243         }
1244
1245 int ssl3_send_server_key_exchange(SSL *s)
1246         {
1247 #ifndef OPENSSL_NO_RSA
1248         unsigned char *q;
1249         int j,num;
1250         RSA *rsa;
1251         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1252         unsigned int u;
1253 #endif
1254 #ifndef OPENSSL_NO_DH
1255         DH *dh=NULL,*dhp;
1256 #endif
1257 #ifndef OPENSSL_NO_ECDH
1258         EC_KEY *ecdh=NULL, *ecdhp;
1259         unsigned char *encodedPoint = NULL;
1260         int encodedlen = 0;
1261         int curve_id = 0;
1262         BN_CTX *bn_ctx = NULL;
1263 #endif
1264         EVP_PKEY *pkey;
1265         unsigned char *p,*d;
1266         int al,i;
1267         unsigned long type;
1268         int n;
1269         CERT *cert;
1270         BIGNUM *r[4];
1271         int nr[4],kn;
1272         BUF_MEM *buf;
1273         EVP_MD_CTX md_ctx;
1274
1275         EVP_MD_CTX_init(&md_ctx);
1276         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1277                 {
1278                 type=s->s3->tmp.new_cipher->algorithm_mkey;
1279                 cert=s->cert;
1280
1281                 buf=s->init_buf;
1282
1283                 r[0]=r[1]=r[2]=r[3]=NULL;
1284                 n=0;
1285 #ifndef OPENSSL_NO_RSA
1286                 if (type & SSL_kRSA)
1287                         {
1288                         rsa=cert->rsa_tmp;
1289                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1290                                 {
1291                                 rsa=s->cert->rsa_tmp_cb(s,
1292                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1293                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1294                                 if(rsa == NULL)
1295                                 {
1296                                         al=SSL_AD_HANDSHAKE_FAILURE;
1297                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1298                                         goto f_err;
1299                                 }
1300                                 RSA_up_ref(rsa);
1301                                 cert->rsa_tmp=rsa;
1302                                 }
1303                         if (rsa == NULL)
1304                                 {
1305                                 al=SSL_AD_HANDSHAKE_FAILURE;
1306                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1307                                 goto f_err;
1308                                 }
1309                         r[0]=rsa->n;
1310                         r[1]=rsa->e;
1311                         s->s3->tmp.use_rsa_tmp=1;
1312                         }
1313                 else
1314 #endif
1315 #ifndef OPENSSL_NO_DH
1316                         if (type & SSL_kEDH)
1317                         {
1318                         dhp=cert->dh_tmp;
1319                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1320                                 dhp=s->cert->dh_tmp_cb(s,
1321                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1322                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1323                         if (dhp == NULL)
1324                                 {
1325                                 al=SSL_AD_HANDSHAKE_FAILURE;
1326                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1327                                 goto f_err;
1328                                 }
1329
1330                         if (s->s3->tmp.dh != NULL)
1331                                 {
1332                                 DH_free(dh);
1333                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1334                                 goto err;
1335                                 }
1336
1337                         if ((dh=DHparams_dup(dhp)) == NULL)
1338                                 {
1339                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1340                                 goto err;
1341                                 }
1342
1343                         s->s3->tmp.dh=dh;
1344                         if ((dhp->pub_key == NULL ||
1345                              dhp->priv_key == NULL ||
1346                              (s->options & SSL_OP_SINGLE_DH_USE)))
1347                                 {
1348                                 if(!DH_generate_key(dh))
1349                                     {
1350                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1351                                            ERR_R_DH_LIB);
1352                                     goto err;
1353                                     }
1354                                 }
1355                         else
1356                                 {
1357                                 dh->pub_key=BN_dup(dhp->pub_key);
1358                                 dh->priv_key=BN_dup(dhp->priv_key);
1359                                 if ((dh->pub_key == NULL) ||
1360                                         (dh->priv_key == NULL))
1361                                         {
1362                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1363                                         goto err;
1364                                         }
1365                                 }
1366                         r[0]=dh->p;
1367                         r[1]=dh->g;
1368                         r[2]=dh->pub_key;
1369                         }
1370                 else
1371 #endif
1372 #ifndef OPENSSL_NO_ECDH
1373                         if (type & SSL_kEECDH)
1374                         {
1375                         const EC_GROUP *group;
1376
1377                         ecdhp=cert->ecdh_tmp;
1378                         if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
1379                                 {
1380                                 ecdhp=s->cert->ecdh_tmp_cb(s,
1381                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1382                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1383                                 }
1384                         if (ecdhp == NULL)
1385                                 {
1386                                 al=SSL_AD_HANDSHAKE_FAILURE;
1387                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1388                                 goto f_err;
1389                                 }
1390
1391                         if (s->s3->tmp.ecdh != NULL)
1392                                 {
1393                                 EC_KEY_free(s->s3->tmp.ecdh);
1394                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1395                                 goto err;
1396                                 }
1397
1398                         /* Duplicate the ECDH structure. */
1399                         if (ecdhp == NULL)
1400                                 {
1401                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1402                                 goto err;
1403                                 }
1404                         if (!EC_KEY_up_ref(ecdhp))
1405                                 {
1406                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1407                                 goto err;
1408                                 }
1409                         ecdh = ecdhp;
1410
1411                         s->s3->tmp.ecdh=ecdh;
1412                         if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1413                             (EC_KEY_get0_private_key(ecdh) == NULL) ||
1414                             (s->options & SSL_OP_SINGLE_ECDH_USE))
1415                                 {
1416                                 if(!EC_KEY_generate_key(ecdh))
1417                                     {
1418                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1419                                     goto err;
1420                                     }
1421                                 }
1422
1423                         if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1424                             (EC_KEY_get0_public_key(ecdh)  == NULL) ||
1425                             (EC_KEY_get0_private_key(ecdh) == NULL))
1426                                 {
1427                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1428                                 goto err;
1429                                 }
1430
1431                         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1432                             (EC_GROUP_get_degree(group) > 163))
1433                                 {
1434                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1435                                 goto err;
1436                                 }
1437
1438                         /* XXX: For now, we only support ephemeral ECDH
1439                          * keys over named (not generic) curves. For
1440                          * supported named curves, curve_id is non-zero.
1441                          */
1442                         if ((curve_id =
1443                             tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1444                             == 0)
1445                                 {
1446                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1447                                 goto err;
1448                                 }
1449
1450                         /* Encode the public key.
1451                          * First check the size of encoding and
1452                          * allocate memory accordingly.
1453                          */
1454                         encodedlen = EC_POINT_point2oct(group,
1455                             EC_KEY_get0_public_key(ecdh),
1456                             POINT_CONVERSION_UNCOMPRESSED,
1457                             NULL, 0, NULL);
1458
1459                         encodedPoint = (unsigned char *)
1460                             OPENSSL_malloc(encodedlen*sizeof(unsigned char));
1461                         bn_ctx = BN_CTX_new();
1462                         if ((encodedPoint == NULL) || (bn_ctx == NULL))
1463                                 {
1464                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1465                                 goto err;
1466                                 }
1467
1468
1469                         encodedlen = EC_POINT_point2oct(group,
1470                             EC_KEY_get0_public_key(ecdh),
1471                             POINT_CONVERSION_UNCOMPRESSED,
1472                             encodedPoint, encodedlen, bn_ctx);
1473
1474                         if (encodedlen == 0)
1475                                 {
1476                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1477                                 goto err;
1478                                 }
1479
1480                         BN_CTX_free(bn_ctx);  bn_ctx=NULL;
1481
1482                         /* XXX: For now, we only support named (not
1483                          * generic) curves in ECDH ephemeral key exchanges.
1484                          * In this situation, we need four additional bytes
1485                          * to encode the entire ServerECDHParams
1486                          * structure.
1487                          */
1488                         n = 4 + encodedlen;
1489
1490                         /* We'll generate the serverKeyExchange message
1491                          * explicitly so we can set these to NULLs
1492                          */
1493                         r[0]=NULL;
1494                         r[1]=NULL;
1495                         r[2]=NULL;
1496                         r[3]=NULL;
1497                         }
1498                 else
1499 #endif /* !OPENSSL_NO_ECDH */
1500 #ifndef OPENSSL_NO_PSK
1501                         if (type & SSL_kPSK)
1502                                 {
1503                                 /* reserve size for record length and PSK identity hint*/
1504                                 n+=2+strlen(s->ctx->psk_identity_hint);
1505                                 }
1506                         else
1507 #endif /* !OPENSSL_NO_PSK */
1508                         {
1509                         al=SSL_AD_HANDSHAKE_FAILURE;
1510                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1511                         goto f_err;
1512                         }
1513                 for (i=0; r[i] != NULL; i++)
1514                         {
1515                         nr[i]=BN_num_bytes(r[i]);
1516                         n+=2+nr[i];
1517                         }
1518
1519                 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1520                         && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
1521                         {
1522                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
1523                                 == NULL)
1524                                 {
1525                                 al=SSL_AD_DECODE_ERROR;
1526                                 goto f_err;
1527                                 }
1528                         kn=EVP_PKEY_size(pkey);
1529                         }
1530                 else
1531                         {
1532                         pkey=NULL;
1533                         kn=0;
1534                         }
1535
1536                 if (!BUF_MEM_grow_clean(buf,n+4+kn))
1537                         {
1538                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1539                         goto err;
1540                         }
1541                 d=(unsigned char *)s->init_buf->data;
1542                 p= &(d[4]);
1543
1544                 for (i=0; r[i] != NULL; i++)
1545                         {
1546                         s2n(nr[i],p);
1547                         BN_bn2bin(r[i],p);
1548                         p+=nr[i];
1549                         }
1550
1551 #ifndef OPENSSL_NO_ECDH
1552                 if (type & SSL_kEECDH)
1553                         {
1554                         /* XXX: For now, we only support named (not generic) curves.
1555                          * In this situation, the serverKeyExchange message has:
1556                          * [1 byte CurveType], [2 byte CurveName]
1557                          * [1 byte length of encoded point], followed by
1558                          * the actual encoded point itself
1559                          */
1560                         *p = NAMED_CURVE_TYPE;
1561                         p += 1;
1562                         *p = 0;
1563                         p += 1;
1564                         *p = curve_id;
1565                         p += 1;
1566                         *p = encodedlen;
1567                         p += 1;
1568                         memcpy((unsigned char*)p,
1569                             (unsigned char *)encodedPoint,
1570                             encodedlen);
1571                         OPENSSL_free(encodedPoint);
1572                         p += encodedlen;
1573                         }
1574 #endif
1575
1576 #ifndef OPENSSL_NO_PSK
1577                 if (type & SSL_kPSK)
1578                         {
1579                         /* copy PSK identity hint */
1580                         s2n(strlen(s->ctx->psk_identity_hint), p);
1581                         strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
1582                         p+=strlen(s->ctx->psk_identity_hint);
1583                         }
1584 #endif
1585
1586                 /* not anonymous */
1587                 if (pkey != NULL)
1588                         {
1589                         /* n is the length of the params, they start at &(d[4])
1590                          * and p points to the space at the end. */
1591 #ifndef OPENSSL_NO_RSA
1592                         if (pkey->type == EVP_PKEY_RSA)
1593                                 {
1594                                 q=md_buf;
1595                                 j=0;
1596                                 for (num=2; num > 0; num--)
1597                                         {
1598                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1599                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1600                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1601                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1602                                         EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1603                                         EVP_DigestFinal_ex(&md_ctx,q,
1604                                                 (unsigned int *)&i);
1605                                         q+=i;
1606                                         j+=i;
1607                                         }
1608                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1609                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1610                                         {
1611                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1612                                         goto err;
1613                                         }
1614                                 s2n(u,p);
1615                                 n+=u+2;
1616                                 }
1617                         else
1618 #endif
1619 #if !defined(OPENSSL_NO_DSA)
1620                                 if (pkey->type == EVP_PKEY_DSA)
1621                                 {
1622                                 /* lets do DSS */
1623                                 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
1624                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1625                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1626                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1627                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1628                                         (unsigned int *)&i,pkey))
1629                                         {
1630                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1631                                         goto err;
1632                                         }
1633                                 s2n(i,p);
1634                                 n+=i+2;
1635                                 }
1636                         else
1637 #endif
1638 #if !defined(OPENSSL_NO_ECDSA)
1639                                 if (pkey->type == EVP_PKEY_EC)
1640                                 {
1641                                 /* let's do ECDSA */
1642                                 EVP_SignInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1643                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1644                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1645                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1646                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1647                                         (unsigned int *)&i,pkey))
1648                                         {
1649                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_ECDSA);
1650                                         goto err;
1651                                         }
1652                                 s2n(i,p);
1653                                 n+=i+2;
1654                                 }
1655                         else
1656 #endif
1657                                 {
1658                                 /* Is this error check actually needed? */
1659                                 al=SSL_AD_HANDSHAKE_FAILURE;
1660                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1661                                 goto f_err;
1662                                 }
1663                         }
1664
1665                 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
1666                 l2n3(n,d);
1667
1668                 /* we should now have things packed up, so lets send
1669                  * it off */
1670                 s->init_num=n+4;
1671                 s->init_off=0;
1672                 }
1673
1674         s->state = SSL3_ST_SW_KEY_EXCH_B;
1675         EVP_MD_CTX_cleanup(&md_ctx);
1676         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1677 f_err:
1678         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1679 err:
1680 #ifndef OPENSSL_NO_ECDH
1681         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1682         BN_CTX_free(bn_ctx);
1683 #endif
1684         EVP_MD_CTX_cleanup(&md_ctx);
1685         return(-1);
1686         }
1687
1688 int ssl3_send_certificate_request(SSL *s)
1689         {
1690         unsigned char *p,*d;
1691         int i,j,nl,off,n;
1692         STACK_OF(X509_NAME) *sk=NULL;
1693         X509_NAME *name;
1694         BUF_MEM *buf;
1695
1696         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1697                 {
1698                 buf=s->init_buf;
1699
1700                 d=p=(unsigned char *)&(buf->data[4]);
1701
1702                 /* get the list of acceptable cert types */
1703                 p++;
1704                 n=ssl3_get_req_cert_type(s,p);
1705                 d[0]=n;
1706                 p+=n;
1707                 n++;
1708
1709                 off=n;
1710                 p+=2;
1711                 n+=2;
1712
1713                 sk=SSL_get_client_CA_list(s);
1714                 nl=0;
1715                 if (sk != NULL)
1716                         {
1717                         for (i=0; i<sk_X509_NAME_num(sk); i++)
1718                                 {
1719                                 name=sk_X509_NAME_value(sk,i);
1720                                 j=i2d_X509_NAME(name,NULL);
1721                                 if (!BUF_MEM_grow_clean(buf,4+n+j+2))
1722                                         {
1723                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1724                                         goto err;
1725                                         }
1726                                 p=(unsigned char *)&(buf->data[4+n]);
1727                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1728                                         {
1729                                         s2n(j,p);
1730                                         i2d_X509_NAME(name,&p);
1731                                         n+=2+j;
1732                                         nl+=2+j;
1733                                         }
1734                                 else
1735                                         {
1736                                         d=p;
1737                                         i2d_X509_NAME(name,&p);
1738                                         j-=2; s2n(j,d); j+=2;
1739                                         n+=j;
1740                                         nl+=j;
1741                                         }
1742                                 }
1743                         }
1744                 /* else no CA names */
1745                 p=(unsigned char *)&(buf->data[4+off]);
1746                 s2n(nl,p);
1747
1748                 d=(unsigned char *)buf->data;
1749                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1750                 l2n3(n,d);
1751
1752                 /* we should now have things packed up, so lets send
1753                  * it off */
1754
1755                 s->init_num=n+4;
1756                 s->init_off=0;
1757 #ifdef NETSCAPE_HANG_BUG
1758                 p=(unsigned char *)s->init_buf->data + s->init_num;
1759
1760                 /* do the header */
1761                 *(p++)=SSL3_MT_SERVER_DONE;
1762                 *(p++)=0;
1763                 *(p++)=0;
1764                 *(p++)=0;
1765                 s->init_num += 4;
1766 #endif
1767
1768                 s->state = SSL3_ST_SW_CERT_REQ_B;
1769                 }
1770
1771         /* SSL3_ST_SW_CERT_REQ_B */
1772         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1773 err:
1774         return(-1);
1775         }
1776
1777 int ssl3_get_client_key_exchange(SSL *s)
1778         {
1779         int i,al,ok;
1780         long n;
1781         unsigned long alg_k;
1782         unsigned char *p;
1783 #ifndef OPENSSL_NO_RSA
1784         RSA *rsa=NULL;
1785         EVP_PKEY *pkey=NULL;
1786 #endif
1787 #ifndef OPENSSL_NO_DH
1788         BIGNUM *pub=NULL;
1789         DH *dh_srvr;
1790 #endif
1791 #ifndef OPENSSL_NO_KRB5
1792         KSSL_ERR kssl_err;
1793 #endif /* OPENSSL_NO_KRB5 */
1794
1795 #ifndef OPENSSL_NO_ECDH
1796         EC_KEY *srvr_ecdh = NULL;
1797         EVP_PKEY *clnt_pub_pkey = NULL;
1798         EC_POINT *clnt_ecpoint = NULL;
1799         BN_CTX *bn_ctx = NULL;
1800 #endif
1801
1802         n=s->method->ssl_get_message(s,
1803                 SSL3_ST_SR_KEY_EXCH_A,
1804                 SSL3_ST_SR_KEY_EXCH_B,
1805                 SSL3_MT_CLIENT_KEY_EXCHANGE,
1806                 2048, /* ??? */
1807                 &ok);
1808
1809         if (!ok) return((int)n);
1810         p=(unsigned char *)s->init_msg;
1811
1812         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
1813
1814 #ifndef OPENSSL_NO_RSA
1815         if (alg_k & SSL_kRSA)
1816                 {
1817                 /* FIX THIS UP EAY EAY EAY EAY */
1818                 if (s->s3->tmp.use_rsa_tmp)
1819                         {
1820                         if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
1821                                 rsa=s->cert->rsa_tmp;
1822                         /* Don't do a callback because rsa_tmp should
1823                          * be sent already */
1824                         if (rsa == NULL)
1825                                 {
1826                                 al=SSL_AD_HANDSHAKE_FAILURE;
1827                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
1828                                 goto f_err;
1829
1830                                 }
1831                         }
1832                 else
1833                         {
1834                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
1835                         if (    (pkey == NULL) ||
1836                                 (pkey->type != EVP_PKEY_RSA) ||
1837                                 (pkey->pkey.rsa == NULL))
1838                                 {
1839                                 al=SSL_AD_HANDSHAKE_FAILURE;
1840                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
1841                                 goto f_err;
1842                                 }
1843                         rsa=pkey->pkey.rsa;
1844                         }
1845
1846                 /* TLS and [incidentally] DTLS{0xFEFF} */
1847                 if (s->version > SSL3_VERSION)
1848                         {
1849                         n2s(p,i);
1850                         if (n != i+2)
1851                                 {
1852                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
1853                                         {
1854                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
1855                                         goto err;
1856                                         }
1857                                 else
1858                                         p-=2;
1859                                 }
1860                         else
1861                                 n=i;
1862                         }
1863
1864                 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
1865
1866                 al = -1;
1867
1868                 if (i != SSL_MAX_MASTER_KEY_LENGTH)
1869                         {
1870                         al=SSL_AD_DECODE_ERROR;
1871                         /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT); */
1872                         }
1873
1874                 if ((al == -1) && !((p[0] == (s->client_version>>8)) && (p[1] == (s->client_version & 0xff))))
1875                         {
1876                         /* The premaster secret must contain the same version number as the
1877                          * ClientHello to detect version rollback attacks (strangely, the
1878                          * protocol does not offer such protection for DH ciphersuites).
1879                          * However, buggy clients exist that send the negotiated protocol
1880                          * version instead if the server does not support the requested
1881                          * protocol version.
1882                          * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
1883                         if (!((s->options & SSL_OP_TLS_ROLLBACK_BUG) &&
1884                                 (p[0] == (s->version>>8)) && (p[1] == (s->version & 0xff))))
1885                                 {
1886                                 al=SSL_AD_DECODE_ERROR;
1887                                 /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER); */
1888
1889                                 /* The Klima-Pokorny-Rosa extension of Bleichenbacher's attack
1890                                  * (http://eprint.iacr.org/2003/052/) exploits the version
1891                                  * number check as a "bad version oracle" -- an alert would
1892                                  * reveal that the plaintext corresponding to some ciphertext
1893                                  * made up by the adversary is properly formatted except
1894                                  * that the version number is wrong.  To avoid such attacks,
1895                                  * we should treat this just like any other decryption error. */
1896                                 }
1897                         }
1898
1899                 if (al != -1)
1900                         {
1901                         /* Some decryption failure -- use random value instead as countermeasure
1902                          * against Bleichenbacher's attack on PKCS #1 v1.5 RSA padding
1903                          * (see RFC 2246, section 7.4.7.1). */
1904                         ERR_clear_error();
1905                         i = SSL_MAX_MASTER_KEY_LENGTH;
1906                         p[0] = s->client_version >> 8;
1907                         p[1] = s->client_version & 0xff;
1908                         if (RAND_pseudo_bytes(p+2, i-2) <= 0) /* should be RAND_bytes, but we cannot work around a failure */
1909                                 goto err;
1910                         }
1911
1912                 s->session->master_key_length=
1913                         s->method->ssl3_enc->generate_master_secret(s,
1914                                 s->session->master_key,
1915                                 p,i);
1916                 OPENSSL_cleanse(p,i);
1917                 }
1918         else
1919 #endif
1920 #ifndef OPENSSL_NO_DH
1921                 if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1922                 {
1923                 n2s(p,i);
1924                 if (n != i+2)
1925                         {
1926                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
1927                                 {
1928                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
1929                                 goto err;
1930                                 }
1931                         else
1932                                 {
1933                                 p-=2;
1934                                 i=(int)n;
1935                                 }
1936                         }
1937
1938                 if (n == 0L) /* the parameters are in the cert */
1939                         {
1940                         al=SSL_AD_HANDSHAKE_FAILURE;
1941                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_DECODE_DH_CERTS);
1942                         goto f_err;
1943                         }
1944                 else
1945                         {
1946                         if (s->s3->tmp.dh == NULL)
1947                                 {
1948                                 al=SSL_AD_HANDSHAKE_FAILURE;
1949                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1950                                 goto f_err;
1951                                 }
1952                         else
1953                                 dh_srvr=s->s3->tmp.dh;
1954                         }
1955
1956                 pub=BN_bin2bn(p,i,NULL);
1957                 if (pub == NULL)
1958                         {
1959                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
1960                         goto err;
1961                         }
1962
1963                 i=DH_compute_key(p,pub,dh_srvr);
1964
1965                 if (i <= 0)
1966                         {
1967                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1968                         goto err;
1969                         }
1970
1971                 DH_free(s->s3->tmp.dh);
1972                 s->s3->tmp.dh=NULL;
1973
1974                 BN_clear_free(pub);
1975                 pub=NULL;
1976                 s->session->master_key_length=
1977                         s->method->ssl3_enc->generate_master_secret(s,
1978                                 s->session->master_key,p,i);
1979                 OPENSSL_cleanse(p,i);
1980                 }
1981         else
1982 #endif
1983 #ifndef OPENSSL_NO_KRB5
1984         if (alg_k & SSL_kKRB5)
1985                 {
1986                 krb5_error_code         krb5rc;
1987                 krb5_data               enc_ticket;
1988                 krb5_data               authenticator;
1989                 krb5_data               enc_pms;
1990                 KSSL_CTX                *kssl_ctx = s->kssl_ctx;
1991                 EVP_CIPHER_CTX          ciph_ctx;
1992                 EVP_CIPHER              *enc = NULL;
1993                 unsigned char           iv[EVP_MAX_IV_LENGTH];
1994                 unsigned char           pms[SSL_MAX_MASTER_KEY_LENGTH
1995                                                + EVP_MAX_BLOCK_LENGTH];
1996                 int                  padl, outl;
1997                 krb5_timestamp          authtime = 0;
1998                 krb5_ticket_times       ttimes;
1999
2000                 EVP_CIPHER_CTX_init(&ciph_ctx);
2001
2002                 if (!kssl_ctx)  kssl_ctx = kssl_ctx_new();
2003
2004                 n2s(p,i);
2005                 enc_ticket.length = i;
2006
2007                 if (n < enc_ticket.length + 6)
2008                         {
2009                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2010                                 SSL_R_DATA_LENGTH_TOO_LONG);
2011                         goto err;
2012                         }
2013
2014                 enc_ticket.data = (char *)p;
2015                 p+=enc_ticket.length;
2016
2017                 n2s(p,i);
2018                 authenticator.length = i;
2019
2020                 if (n < enc_ticket.length + authenticator.length + 6)
2021                         {
2022                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2023                                 SSL_R_DATA_LENGTH_TOO_LONG);
2024                         goto err;
2025                         }
2026
2027                 authenticator.data = (char *)p;
2028                 p+=authenticator.length;
2029
2030                 n2s(p,i);
2031                 enc_pms.length = i;
2032                 enc_pms.data = (char *)p;
2033                 p+=enc_pms.length;
2034
2035                 /* Note that the length is checked again below,
2036                 ** after decryption
2037                 */
2038                 if(enc_pms.length > sizeof pms)
2039                         {
2040                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2041                                SSL_R_DATA_LENGTH_TOO_LONG);
2042                         goto err;
2043                         }
2044
2045                 if (n != (long)(enc_ticket.length + authenticator.length +
2046                                                 enc_pms.length + 6))
2047                         {
2048                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2049                                 SSL_R_DATA_LENGTH_TOO_LONG);
2050                         goto err;
2051                         }
2052
2053                 if ((krb5rc = kssl_sget_tkt(kssl_ctx, &enc_ticket, &ttimes,
2054                                         &kssl_err)) != 0)
2055                         {
2056 #ifdef KSSL_DEBUG
2057                         printf("kssl_sget_tkt rtn %d [%d]\n",
2058                                 krb5rc, kssl_err.reason);
2059                         if (kssl_err.text)
2060                                 printf("kssl_err text= %s\n", kssl_err.text);
2061 #endif  /* KSSL_DEBUG */
2062                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2063                                 kssl_err.reason);
2064                         goto err;
2065                         }
2066
2067                 /*  Note: no authenticator is not considered an error,
2068                 **  but will return authtime == 0.
2069                 */
2070                 if ((krb5rc = kssl_check_authent(kssl_ctx, &authenticator,
2071                                         &authtime, &kssl_err)) != 0)
2072                         {
2073 #ifdef KSSL_DEBUG
2074                         printf("kssl_check_authent rtn %d [%d]\n",
2075                                 krb5rc, kssl_err.reason);
2076                         if (kssl_err.text)
2077                                 printf("kssl_err text= %s\n", kssl_err.text);
2078 #endif  /* KSSL_DEBUG */
2079                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2080                                 kssl_err.reason);
2081                         goto err;
2082                         }
2083
2084                 if ((krb5rc = kssl_validate_times(authtime, &ttimes)) != 0)
2085                         {
2086                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, krb5rc);
2087                         goto err;
2088                         }
2089
2090 #ifdef KSSL_DEBUG
2091                 kssl_ctx_show(kssl_ctx);
2092 #endif  /* KSSL_DEBUG */
2093
2094                 enc = kssl_map_enc(kssl_ctx->enctype);
2095                 if (enc == NULL)
2096                     goto err;
2097
2098                 memset(iv, 0, sizeof iv);       /* per RFC 1510 */
2099
2100                 if (!EVP_DecryptInit_ex(&ciph_ctx,enc,NULL,kssl_ctx->key,iv))
2101                         {
2102                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2103                                 SSL_R_DECRYPTION_FAILED);
2104                         goto err;
2105                         }
2106                 if (!EVP_DecryptUpdate(&ciph_ctx, pms,&outl,
2107                                         (unsigned char *)enc_pms.data, enc_pms.length))
2108                         {
2109                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2110                                 SSL_R_DECRYPTION_FAILED);
2111                         goto err;
2112                         }
2113                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2114                         {
2115                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2116                                 SSL_R_DATA_LENGTH_TOO_LONG);
2117                         goto err;
2118                         }
2119                 if (!EVP_DecryptFinal_ex(&ciph_ctx,&(pms[outl]),&padl))
2120                         {
2121                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2122                                 SSL_R_DECRYPTION_FAILED);
2123                         goto err;
2124                         }
2125                 outl += padl;
2126                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2127                         {
2128                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2129                                 SSL_R_DATA_LENGTH_TOO_LONG);
2130                         goto err;
2131                         }
2132                 if (!((p[0] == (s->client_version>>8)) && (p[1] == (s->client_version & 0xff))))
2133                     {
2134                     /* The premaster secret must contain the same version number as the
2135                      * ClientHello to detect version rollback attacks (strangely, the
2136                      * protocol does not offer such protection for DH ciphersuites).
2137                      * However, buggy clients exist that send random bytes instead of
2138                      * the protocol version.
2139                      * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients.
2140                      * (Perhaps we should have a separate BUG value for the Kerberos cipher)
2141                      */
2142                     if (!((s->options & SSL_OP_TLS_ROLLBACK_BUG) &&
2143                            (p[0] == (s->version>>8)) && (p[1] == (s->version & 0xff))))
2144                         {
2145                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2146                                SSL_AD_DECODE_ERROR);
2147                         goto err;
2148                         }
2149                     }
2150
2151                 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2152
2153                 s->session->master_key_length=
2154                         s->method->ssl3_enc->generate_master_secret(s,
2155                                 s->session->master_key, pms, outl);
2156
2157                 if (kssl_ctx->client_princ)
2158                         {
2159                         size_t len = strlen(kssl_ctx->client_princ);
2160                         if ( len < SSL_MAX_KRB5_PRINCIPAL_LENGTH )
2161                                 {
2162                                 s->session->krb5_client_princ_len = len;
2163                                 memcpy(s->session->krb5_client_princ,kssl_ctx->client_princ,len);
2164                                 }
2165                         }
2166
2167
2168                 /*  Was doing kssl_ctx_free() here,
2169                 **  but it caused problems for apache.
2170                 **  kssl_ctx = kssl_ctx_free(kssl_ctx);
2171                 **  if (s->kssl_ctx)  s->kssl_ctx = NULL;
2172                 */
2173                 }
2174         else
2175 #endif  /* OPENSSL_NO_KRB5 */
2176
2177 #ifndef OPENSSL_NO_ECDH
2178                 if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2179                 {
2180                 int ret = 1;
2181                 int field_size = 0;
2182                 const EC_KEY   *tkey;
2183                 const EC_GROUP *group;
2184                 const BIGNUM *priv_key;
2185
2186                 /* initialize structures for server's ECDH key pair */
2187                 if ((srvr_ecdh = EC_KEY_new()) == NULL)
2188                         {
2189                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2190                             ERR_R_MALLOC_FAILURE);
2191                         goto err;
2192                         }
2193
2194                 /* Let's get server private key and group information */
2195                 if (alg_k & (SSL_kECDHr|SSL_kECDHe))
2196                         {
2197                         /* use the certificate */
2198                         tkey = s->cert->pkeys[SSL_PKEY_ECC].privatekey->pkey.ec;
2199                         }
2200                 else
2201                         {
2202                         /* use the ephermeral values we saved when
2203                          * generating the ServerKeyExchange msg.
2204                          */
2205                         tkey = s->s3->tmp.ecdh;
2206                         }
2207
2208                 group    = EC_KEY_get0_group(tkey);
2209                 priv_key = EC_KEY_get0_private_key(tkey);
2210
2211                 if (!EC_KEY_set_group(srvr_ecdh, group) ||
2212                     !EC_KEY_set_private_key(srvr_ecdh, priv_key))
2213                         {
2214                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2215                                ERR_R_EC_LIB);
2216                         goto err;
2217                         }
2218
2219                 /* Let's get client's public key */
2220                 if ((clnt_ecpoint = EC_POINT_new(group)) == NULL)
2221                         {
2222                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2223                             ERR_R_MALLOC_FAILURE);
2224                         goto err;
2225                         }
2226
2227                 if (n == 0L)
2228                         {
2229                         /* Client Publickey was in Client Certificate */
2230
2231                          if (alg_k & SSL_kEECDH)
2232                                  {
2233                                  al=SSL_AD_HANDSHAKE_FAILURE;
2234                                  SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
2235                                  goto f_err;
2236                                  }
2237                         if (((clnt_pub_pkey=X509_get_pubkey(s->session->peer))
2238                             == NULL) ||
2239                             (clnt_pub_pkey->type != EVP_PKEY_EC))
2240                                 {
2241                                 /* XXX: For now, we do not support client
2242                                  * authentication using ECDH certificates
2243                                  * so this branch (n == 0L) of the code is
2244                                  * never executed. When that support is
2245                                  * added, we ought to ensure the key
2246                                  * received in the certificate is
2247                                  * authorized for key agreement.
2248                                  * ECDH_compute_key implicitly checks that
2249                                  * the two ECDH shares are for the same
2250                                  * group.
2251                                  */
2252                                 al=SSL_AD_HANDSHAKE_FAILURE;
2253                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2254                                     SSL_R_UNABLE_TO_DECODE_ECDH_CERTS);
2255                                 goto f_err;
2256                                 }
2257
2258                         if (EC_POINT_copy(clnt_ecpoint,
2259                             EC_KEY_get0_public_key(clnt_pub_pkey->pkey.ec)) == 0)
2260                                 {
2261                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2262                                         ERR_R_EC_LIB);
2263                                 goto err;
2264                                 }
2265                         ret = 2; /* Skip certificate verify processing */
2266                         }
2267                 else
2268                         {
2269                         /* Get client's public key from encoded point
2270                          * in the ClientKeyExchange message.
2271                          */
2272                         if ((bn_ctx = BN_CTX_new()) == NULL)
2273                                 {
2274                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2275                                     ERR_R_MALLOC_FAILURE);
2276                                 goto err;
2277                                 }
2278
2279                         /* Get encoded point length */
2280                         i = *p;
2281                         p += 1;
2282                         if (EC_POINT_oct2point(group,
2283                             clnt_ecpoint, p, i, bn_ctx) == 0)
2284                                 {
2285                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2286                                     ERR_R_EC_LIB);
2287                                 goto err;
2288                                 }
2289                         /* p is pointing to somewhere in the buffer
2290                          * currently, so set it to the start
2291                          */
2292                         p=(unsigned char *)s->init_buf->data;
2293                         }
2294
2295                 /* Compute the shared pre-master secret */
2296                 field_size = EC_GROUP_get_degree(group);
2297                 if (field_size <= 0)
2298                         {
2299                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2300                                ERR_R_ECDH_LIB);
2301                         goto err;
2302                         }
2303                 i = ECDH_compute_key(p, (field_size+7)/8, clnt_ecpoint, srvr_ecdh, NULL);
2304                 if (i <= 0)
2305                         {
2306                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2307                             ERR_R_ECDH_LIB);
2308                         goto err;
2309                         }
2310
2311                 EVP_PKEY_free(clnt_pub_pkey);
2312                 EC_POINT_free(clnt_ecpoint);
2313                 if (srvr_ecdh != NULL)
2314                         EC_KEY_free(srvr_ecdh);
2315                 BN_CTX_free(bn_ctx);
2316
2317                 /* Compute the master secret */
2318                 s->session->master_key_length = s->method->ssl3_enc-> \
2319                     generate_master_secret(s, s->session->master_key, p, i);
2320
2321                 OPENSSL_cleanse(p, i);
2322                 return (ret);
2323                 }
2324         else
2325 #endif
2326 #ifndef OPENSSL_NO_PSK
2327                 if (alg_k & SSL_kPSK)
2328                         {
2329                         unsigned char *t = NULL;
2330                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
2331                         unsigned int pre_ms_len = 0, psk_len = 0;
2332                         int psk_err = 1;
2333                         char tmp_id[PSK_MAX_IDENTITY_LEN+1];
2334
2335                         al=SSL_AD_HANDSHAKE_FAILURE;
2336
2337                         n2s(p,i);
2338                         if (n != i+2)
2339                                 {
2340                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2341                                         SSL_R_LENGTH_MISMATCH);
2342                                 goto psk_err;
2343                                 }
2344                         if (i > PSK_MAX_IDENTITY_LEN)
2345                                 {
2346                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2347                                         SSL_R_DATA_LENGTH_TOO_LONG);
2348                                 goto psk_err;
2349                                 }
2350                         if (s->psk_server_callback == NULL)
2351                                 {
2352                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2353                                        SSL_R_PSK_NO_SERVER_CB);
2354                                 goto psk_err;
2355                                 }
2356
2357                         /* Create guaranteed NULL-terminated identity
2358                          * string for the callback */
2359                         memcpy(tmp_id, p, i);
2360                         memset(tmp_id+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
2361                         psk_len = s->psk_server_callback(s, tmp_id,
2362                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
2363                         OPENSSL_cleanse(tmp_id, PSK_MAX_IDENTITY_LEN+1);
2364
2365                         if (psk_len > PSK_MAX_PSK_LEN)
2366                                 {
2367                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2368                                         ERR_R_INTERNAL_ERROR);
2369                                 goto psk_err;
2370                                 }
2371                         else if (psk_len == 0)
2372                                 {
2373                                 /* PSK related to the given identity not found */
2374                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2375                                        SSL_R_PSK_IDENTITY_NOT_FOUND);
2376                                 al=SSL_AD_UNKNOWN_PSK_IDENTITY;
2377                                 goto psk_err;
2378                                 }
2379
2380                         /* create PSK pre_master_secret */
2381                         pre_ms_len=2+psk_len+2+psk_len;
2382                         t = psk_or_pre_ms;
2383                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
2384                         s2n(psk_len, t);
2385                         memset(t, 0, psk_len);
2386                         t+=psk_len;
2387                         s2n(psk_len, t);
2388
2389                         if (s->session->psk_identity != NULL)
2390                                 OPENSSL_free(s->session->psk_identity);
2391                         s->session->psk_identity = BUF_strdup((char *)p);
2392                         if (s->session->psk_identity == NULL)
2393                                 {
2394                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2395                                         ERR_R_MALLOC_FAILURE);
2396                                 goto psk_err;
2397                                 }
2398
2399                         if (s->session->psk_identity_hint != NULL)
2400                                 OPENSSL_free(s->session->psk_identity_hint);
2401                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
2402                         if (s->ctx->psk_identity_hint != NULL &&
2403                                 s->session->psk_identity_hint == NULL)
2404                                 {
2405                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2406                                         ERR_R_MALLOC_FAILURE);
2407                                 goto psk_err;
2408                                 }
2409
2410                         s->session->master_key_length=
2411                                 s->method->ssl3_enc->generate_master_secret(s,
2412                                         s->session->master_key, psk_or_pre_ms, pre_ms_len);
2413                         psk_err = 0;
2414                 psk_err:
2415                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
2416                         if (psk_err != 0)
2417                                 goto f_err;
2418                         }
2419                 else
2420 #endif
2421                 if (alg_k & SSL_kGOST)
2422                 {
2423                         EVP_PKEY_CTX *pkey_ctx;
2424                         unsigned char premaster_secret[32];
2425                         size_t outlen;
2426
2427                         /* Get our certificate privatec key*/
2428                         pkey_ctx = EVP_PKEY_CTX_new(s->cert->key->privatekey,NULL);
2429                         EVP_PKEY_decrypt_init(pkey_ctx);
2430                         /* Decrypt session key */
2431                         if ((*p!=( V_ASN1_SEQUENCE| V_ASN1_CONSTRUCTED)) || p[1]!=0x81 )
2432                                 {
2433                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2434                                 goto err;
2435                                 }
2436                         if (EVP_PKEY_decrypt(pkey_ctx,premaster_secret,&outlen,p+3,p[2]) <0)
2437
2438                                 {
2439                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2440                                 goto err;
2441                                 }
2442                         /* Generate master secret */
2443                         EVP_PKEY_CTX_free(pkey_ctx);
2444                         s->session->master_key_length=
2445                                 s->method->ssl3_enc->generate_master_secret(s,
2446                                         s->session->master_key,premaster_secret,32);
2447
2448                 }
2449                 else
2450                 {
2451                 al=SSL_AD_HANDSHAKE_FAILURE;
2452                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2453                                 SSL_R_UNKNOWN_CIPHER_TYPE);
2454                 goto f_err;
2455                 }
2456
2457         return(1);
2458 f_err:
2459         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2460 #if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA) || !defined(OPENSSL_NO_ECDH)
2461 err:
2462 #endif
2463 #ifndef OPENSSL_NO_ECDH
2464         EVP_PKEY_free(clnt_pub_pkey);
2465         EC_POINT_free(clnt_ecpoint);
2466         if (srvr_ecdh != NULL)
2467                 EC_KEY_free(srvr_ecdh);
2468         BN_CTX_free(bn_ctx);
2469 #endif
2470         return(-1);
2471         }
2472
2473 int ssl3_get_cert_verify(SSL *s)
2474         {
2475         EVP_PKEY *pkey=NULL;
2476         unsigned char *p;
2477         int al,ok,ret=0;
2478         long n;
2479         int type=0,i,j;
2480         X509 *peer;
2481
2482         n=s->method->ssl_get_message(s,
2483                 SSL3_ST_SR_CERT_VRFY_A,
2484                 SSL3_ST_SR_CERT_VRFY_B,
2485                 -1,
2486                 514, /* 514? */
2487                 &ok);
2488
2489         if (!ok) return((int)n);
2490
2491         if (s->session->peer != NULL)
2492                 {
2493                 peer=s->session->peer;
2494                 pkey=X509_get_pubkey(peer);
2495                 type=X509_certificate_type(peer,pkey);
2496                 }
2497         else
2498                 {
2499                 peer=NULL;
2500                 pkey=NULL;
2501                 }
2502
2503         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
2504                 {
2505                 s->s3->tmp.reuse_message=1;
2506                 if ((peer != NULL) && (type | EVP_PKT_SIGN))
2507                         {
2508                         al=SSL_AD_UNEXPECTED_MESSAGE;
2509                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
2510                         goto f_err;
2511                         }
2512                 ret=1;
2513                 goto end;
2514                 }
2515
2516         if (peer == NULL)
2517                 {
2518                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
2519                 al=SSL_AD_UNEXPECTED_MESSAGE;
2520                 goto f_err;
2521                 }
2522
2523         if (!(type & EVP_PKT_SIGN))
2524                 {
2525                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
2526                 al=SSL_AD_ILLEGAL_PARAMETER;
2527                 goto f_err;
2528                 }
2529
2530         if (s->s3->change_cipher_spec)
2531                 {
2532                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
2533                 al=SSL_AD_UNEXPECTED_MESSAGE;
2534                 goto f_err;
2535                 }
2536
2537         /* we now have a signature that we need to verify */
2538         p=(unsigned char *)s->init_msg;
2539         /* Check for broken implementations of GOST ciphersuites */
2540         /* If key is GOST and n is exactly 64, it is bare
2541          * signature without length field */
2542         if (n==64 && (pkey->type==NID_id_GostR3410_94 ||
2543                 pkey->type == NID_id_GostR3410_2001) )
2544                 {
2545                 i=64;
2546                 }
2547         else
2548                 {
2549                 n2s(p,i);
2550                 n-=2;
2551                 if (i > n)
2552                         {
2553                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
2554                         al=SSL_AD_DECODE_ERROR;
2555                         goto f_err;
2556                         }
2557         }
2558         j=EVP_PKEY_size(pkey);
2559         if ((i > j) || (n > j) || (n <= 0))
2560                 {
2561                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
2562                 al=SSL_AD_DECODE_ERROR;
2563                 goto f_err;
2564                 }
2565
2566 #ifndef OPENSSL_NO_RSA
2567         if (pkey->type == EVP_PKEY_RSA)
2568                 {
2569                 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
2570                         MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i,
2571                                                         pkey->pkey.rsa);
2572                 if (i < 0)
2573                         {
2574                         al=SSL_AD_DECRYPT_ERROR;
2575                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
2576                         goto f_err;
2577                         }
2578                 if (i == 0)
2579                         {
2580                         al=SSL_AD_DECRYPT_ERROR;
2581                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
2582                         goto f_err;
2583                         }
2584                 }
2585         else
2586 #endif
2587 #ifndef OPENSSL_NO_DSA
2588                 if (pkey->type == EVP_PKEY_DSA)
2589                 {
2590                 j=DSA_verify(pkey->save_type,
2591                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
2592                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
2593                 if (j <= 0)
2594                         {
2595                         /* bad signature */
2596                         al=SSL_AD_DECRYPT_ERROR;
2597                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
2598                         goto f_err;
2599                         }
2600                 }
2601         else
2602 #endif
2603 #ifndef OPENSSL_NO_ECDSA
2604                 if (pkey->type == EVP_PKEY_EC)
2605                 {
2606                 j=ECDSA_verify(pkey->save_type,
2607                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
2608                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.ec);
2609                 if (j <= 0)
2610                         {
2611                         /* bad signature */
2612                         al=SSL_AD_DECRYPT_ERROR;
2613                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
2614                             SSL_R_BAD_ECDSA_SIGNATURE);
2615                         goto f_err;
2616                         }
2617                 }
2618         else
2619 #endif
2620         if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001)
2621                 {   unsigned char signature[64];
2622                         int idx;
2623                         EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new(pkey,NULL);
2624                         EVP_PKEY_verify_init(pctx);
2625                         if (i!=64) {
2626                                 fprintf(stderr,"GOST signature length is %d",i);
2627                         }
2628                         for (idx=0;idx<64;idx++) {
2629                                 signature[63-idx]=p[idx];
2630                         }
2631                         j=EVP_PKEY_verify(pctx,signature,64,s->s3->tmp.cert_verify_md,32);
2632                         EVP_PKEY_CTX_free(pctx);
2633                         if (j<=0)
2634                                 {
2635                                 al=SSL_AD_DECRYPT_ERROR;
2636                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
2637                                         SSL_R_BAD_ECDSA_SIGNATURE);
2638                                 goto f_err;
2639                                 }
2640                 }
2641         else
2642                 {
2643                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
2644                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
2645                 goto f_err;
2646                 }
2647
2648
2649         ret=1;
2650         if (0)
2651                 {
2652 f_err:
2653                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2654                 }
2655 end:
2656         EVP_PKEY_free(pkey);
2657         return(ret);
2658         }
2659
2660 int ssl3_get_client_certificate(SSL *s)
2661         {
2662         int i,ok,al,ret= -1;
2663         X509 *x=NULL;
2664         unsigned long l,nc,llen,n;
2665         const unsigned char *p,*q;
2666         unsigned char *d;
2667         STACK_OF(X509) *sk=NULL;
2668
2669         n=s->method->ssl_get_message(s,
2670                 SSL3_ST_SR_CERT_A,
2671                 SSL3_ST_SR_CERT_B,
2672                 -1,
2673                 s->max_cert_list,
2674                 &ok);
2675
2676         if (!ok) return((int)n);
2677
2678         if      (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
2679                 {
2680                 if (    (s->verify_mode & SSL_VERIFY_PEER) &&
2681                         (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
2682                         {
2683                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
2684                         al=SSL_AD_HANDSHAKE_FAILURE;
2685                         goto f_err;
2686                         }
2687                 /* If tls asked for a client cert, the client must return a 0 list */
2688                 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
2689                         {
2690                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
2691                         al=SSL_AD_UNEXPECTED_MESSAGE;
2692                         goto f_err;
2693                         }
2694                 s->s3->tmp.reuse_message=1;
2695                 return(1);
2696                 }
2697
2698         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
2699                 {
2700                 al=SSL_AD_UNEXPECTED_MESSAGE;
2701                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
2702                 goto f_err;
2703                 }
2704         p=d=(unsigned char *)s->init_msg;
2705
2706         if ((sk=sk_X509_new_null()) == NULL)
2707                 {
2708                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
2709                 goto err;
2710                 }
2711
2712         n2l3(p,llen);
2713         if (llen+3 != n)
2714                 {
2715                 al=SSL_AD_DECODE_ERROR;
2716                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
2717                 goto f_err;
2718                 }
2719         for (nc=0; nc<llen; )
2720                 {
2721                 n2l3(p,l);
2722                 if ((l+nc+3) > llen)
2723                         {
2724                         al=SSL_AD_DECODE_ERROR;
2725                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
2726                         goto f_err;
2727                         }
2728
2729                 q=p;
2730                 x=d2i_X509(NULL,&p,l);
2731                 if (x == NULL)
2732                         {
2733                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
2734                         goto err;
2735                         }
2736                 if (p != (q+l))
2737                         {
2738                         al=SSL_AD_DECODE_ERROR;
2739                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
2740                         goto f_err;
2741                         }
2742                 if (!sk_X509_push(sk,x))
2743                         {
2744                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
2745                         goto err;
2746                         }
2747                 x=NULL;
2748                 nc+=l+3;
2749                 }
2750
2751         if (sk_X509_num(sk) <= 0)
2752                 {
2753                 /* TLS does not mind 0 certs returned */
2754                 if (s->version == SSL3_VERSION)
2755                         {
2756                         al=SSL_AD_HANDSHAKE_FAILURE;
2757                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
2758                         goto f_err;
2759                         }
2760                 /* Fail for TLS only if we required a certificate */
2761                 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
2762                          (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
2763                         {
2764                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
2765                         al=SSL_AD_HANDSHAKE_FAILURE;
2766                         goto f_err;
2767                         }
2768                 }
2769         else
2770                 {
2771                 i=ssl_verify_cert_chain(s,sk);
2772                 if (!i)
2773                         {
2774                         al=ssl_verify_alarm_type(s->verify_result);
2775                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED);
2776                         goto f_err;
2777                         }
2778                 }
2779
2780         if (s->session->peer != NULL) /* This should not be needed */
2781                 X509_free(s->session->peer);
2782         s->session->peer=sk_X509_shift(sk);
2783         s->session->verify_result = s->verify_result;
2784
2785         /* With the current implementation, sess_cert will always be NULL
2786          * when we arrive here. */
2787         if (s->session->sess_cert == NULL)
2788                 {
2789                 s->session->sess_cert = ssl_sess_cert_new();
2790                 if (s->session->sess_cert == NULL)
2791                         {
2792                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
2793                         goto err;
2794                         }
2795                 }
2796         if (s->session->sess_cert->cert_chain != NULL)
2797                 sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free);
2798         s->session->sess_cert->cert_chain=sk;
2799         /* Inconsistency alert: cert_chain does *not* include the
2800          * peer's own certificate, while we do include it in s3_clnt.c */
2801
2802         sk=NULL;
2803
2804         ret=1;
2805         if (0)
2806                 {
2807 f_err:
2808                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2809                 }
2810 err:
2811         if (x != NULL) X509_free(x);
2812         if (sk != NULL) sk_X509_pop_free(sk,X509_free);
2813         return(ret);
2814         }
2815
2816 int ssl3_send_server_certificate(SSL *s)
2817         {
2818         unsigned long l;
2819         X509 *x;
2820
2821         if (s->state == SSL3_ST_SW_CERT_A)
2822                 {
2823                 x=ssl_get_server_send_cert(s);
2824                 if (x == NULL)
2825                         {
2826                         /* VRS: allow null cert if auth == KRB5 */
2827                         if ((s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5) ||
2828                             (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5))
2829                                 {
2830                                 SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
2831                                 return(0);
2832                                 }
2833                         }
2834
2835                 l=ssl3_output_cert_chain(s,x);
2836                 s->state=SSL3_ST_SW_CERT_B;
2837                 s->init_num=(int)l;
2838                 s->init_off=0;
2839                 }
2840
2841         /* SSL3_ST_SW_CERT_B */
2842         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2843         }
2844 #ifndef OPENSSL_NO_TLSEXT
2845 int ssl3_send_newsession_ticket(SSL *s)
2846         {
2847         if (s->state == SSL3_ST_SW_SESSION_TICKET_A)
2848                 {
2849                 unsigned char *p, *senc, *macstart;
2850                 int len, slen;
2851                 unsigned int hlen;
2852                 EVP_CIPHER_CTX ctx;
2853                 HMAC_CTX hctx;
2854                 unsigned char iv[EVP_MAX_IV_LENGTH];
2855                 unsigned char key_name[16];
2856
2857                 /* get session encoding length */
2858                 slen = i2d_SSL_SESSION(s->session, NULL);
2859                 /* Some length values are 16 bits, so forget it if session is
2860                  * too long
2861                  */
2862                 if (slen > 0xFF00)
2863                         return -1;
2864                 /* Grow buffer if need be: the length calculation is as
2865                  * follows 1 (size of message name) + 3 (message length
2866                  * bytes) + 4 (ticket lifetime hint) + 2 (ticket length) +
2867                  * 16 (key name) + max_iv_len (iv length) +
2868                  * session_length + max_enc_block_size (max encrypted session
2869                  * length) + max_md_size (HMAC).
2870                  */
2871                 if (!BUF_MEM_grow(s->init_buf,
2872                         26 + EVP_MAX_IV_LENGTH + EVP_MAX_BLOCK_LENGTH +
2873                         EVP_MAX_MD_SIZE + slen))
2874                         return -1;
2875                 senc = OPENSSL_malloc(slen);
2876                 if (!senc)
2877                         return -1;
2878                 p = senc;
2879                 i2d_SSL_SESSION(s->session, &p);
2880
2881                 p=(unsigned char *)s->init_buf->data;
2882                 /* do the header */
2883                 *(p++)=SSL3_MT_NEWSESSION_TICKET;
2884                 /* Skip message length for now */
2885                 p += 3;
2886                 EVP_CIPHER_CTX_init(&ctx);
2887                 HMAC_CTX_init(&hctx);
2888                 /* Initialize HMAC and cipher contexts. If callback present
2889                  * it does all the work otherwise use generated values
2890                  * from parent ctx.
2891                  */
2892                 if (s->ctx->tlsext_ticket_key_cb)
2893                         {
2894                         if (s->ctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx,
2895                                                          &hctx, 1) < 0)
2896                                 {
2897                                 OPENSSL_free(senc);
2898                                 return -1;
2899                                 }
2900                         }
2901                 else
2902                         {
2903                         RAND_pseudo_bytes(iv, 16);
2904                         EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
2905                                         s->ctx->tlsext_tick_aes_key, iv);
2906                         HMAC_Init_ex(&hctx, s->ctx->tlsext_tick_hmac_key, 16,
2907                                         tlsext_tick_md(), NULL);
2908                         memcpy(key_name, s->ctx->tlsext_tick_key_name, 16);
2909                         }
2910                 l2n(s->session->tlsext_tick_lifetime_hint, p);
2911                 /* Skip ticket length for now */
2912                 p += 2;
2913                 /* Output key name */
2914                 macstart = p;
2915                 memcpy(p, key_name, 16);
2916                 p += 16;
2917                 /* output IV */
2918                 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
2919                 p += EVP_CIPHER_CTX_iv_length(&ctx);
2920                 /* Encrypt session data */
2921                 EVP_EncryptUpdate(&ctx, p, &len, senc, slen);
2922                 p += len;
2923                 EVP_EncryptFinal(&ctx, p, &len);
2924                 p += len;
2925                 EVP_CIPHER_CTX_cleanup(&ctx);
2926
2927                 HMAC_Update(&hctx, macstart, p - macstart);
2928                 HMAC_Final(&hctx, p, &hlen);
2929                 HMAC_CTX_cleanup(&hctx);
2930
2931                 p += hlen;
2932                 /* Now write out lengths: p points to end of data written */
2933                 /* Total length */
2934                 len = p - (unsigned char *)s->init_buf->data;
2935                 p=(unsigned char *)s->init_buf->data + 1;
2936                 l2n3(len - 4, p); /* Message length */
2937                 p += 4;
2938                 s2n(len - 10, p);  /* Ticket length */
2939
2940                 /* number of bytes to write */
2941                 s->init_num= len;
2942                 s->state=SSL3_ST_SW_SESSION_TICKET_B;
2943                 s->init_off=0;
2944                 OPENSSL_free(senc);
2945                 }
2946
2947         /* SSL3_ST_SW_SESSION_TICKET_B */
2948         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2949         }
2950
2951 int ssl3_send_cert_status(SSL *s)
2952         {
2953         if (s->state == SSL3_ST_SW_CERT_STATUS_A)
2954                 {
2955                 unsigned char *p;
2956                 /* Grow buffer if need be: the length calculation is as
2957                  * follows 1 (message type) + 3 (message length) +
2958                  * 1 (ocsp response type) + 3 (ocsp response length)
2959                  * + (ocsp response)
2960                  */
2961                 if (!BUF_MEM_grow(s->init_buf, 8 + s->tlsext_ocsp_resplen))
2962                         return -1;
2963
2964                 p=(unsigned char *)s->init_buf->data;
2965
2966                 /* do the header */
2967                 *(p++)=SSL3_MT_CERTIFICATE_STATUS;
2968                 /* message length */
2969                 l2n3(s->tlsext_ocsp_resplen + 4, p);
2970                 /* status type */
2971                 *(p++)= s->tlsext_status_type;
2972                 /* length of OCSP response */
2973                 l2n3(s->tlsext_ocsp_resplen, p);
2974                 /* actual response */
2975                 memcpy(p, s->tlsext_ocsp_resp, s->tlsext_ocsp_resplen);
2976                 /* number of bytes to write */
2977                 s->init_num = 8 + s->tlsext_ocsp_resplen;
2978                 s->state=SSL3_ST_SW_CERT_STATUS_B;
2979                 s->init_off = 0;
2980                 }
2981
2982         /* SSL3_ST_SW_CERT_STATUS_B */
2983         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2984         }
2985 #endif