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                                         if (!ssl3_digest_cached_records(s))
 535                                                 return -1;
 536                                 for (dgst_num=0; dgst_num<SSL_MAX_DIGEST;dgst_num++)
 537                                         if (s->s3->handshake_dgst[dgst_num])
 538                                                 {
 539                                                 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]));
 540                                                 offset+=EVP_MD_CTX_size(s->s3->handshake_dgst[dgst_num]);
 541                                                 }
 542                                 }
 543                         break;
 544
 545                 case SSL3_ST_SR_CERT_VRFY_A:
 546                 case SSL3_ST_SR_CERT_VRFY_B:
 547
 548                         /* we should decide if we expected this one */
 549                         ret=ssl3_get_cert_verify(s);
 550                         if (ret <= 0) goto end;
 551
 552                         s->state=SSL3_ST_SR_FINISHED_A;
 553                         s->init_num=0;
 554                         break;
 555
 556                 case SSL3_ST_SR_FINISHED_A:
 557                 case SSL3_ST_SR_FINISHED_B:
 558                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
 559                                 SSL3_ST_SR_FINISHED_B);
 560                         if (ret <= 0) goto end;
 561 #ifndef OPENSSL_NO_TLSEXT
 562                         if (s->tlsext_ticket_expected)
 563                                 s->state=SSL3_ST_SW_SESSION_TICKET_A;
 564                         else if (s->hit)
 565                                 s->state=SSL_ST_OK;
 566 #else
 567                         if (s->hit)
 568                                 s->state=SSL_ST_OK;
 569 #endif
 570                         else
 571                                 s->state=SSL3_ST_SW_CHANGE_A;
 572                         s->init_num=0;
 573                         break;
 574
 575 #ifndef OPENSSL_NO_TLSEXT
 576                 case SSL3_ST_SW_SESSION_TICKET_A:
 577                 case SSL3_ST_SW_SESSION_TICKET_B:
 578                         ret=ssl3_send_newsession_ticket(s);
 579                         if (ret <= 0) goto end;
 580                         s->state=SSL3_ST_SW_CHANGE_A;
 581                         s->init_num=0;
 582                         break;
 583
 584                 case SSL3_ST_SW_CERT_STATUS_A:
 585                 case SSL3_ST_SW_CERT_STATUS_B:
 586                         ret=ssl3_send_cert_status(s);
 587                         if (ret <= 0) goto end;
 588                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 589                         s->init_num=0;
 590                         break;
 591
 592 #endif
 593
 594                 case SSL3_ST_SW_CHANGE_A:
 595                 case SSL3_ST_SW_CHANGE_B:
 596
 597                         s->session->cipher=s->s3->tmp.new_cipher;
 598                         if (!s->method->ssl3_enc->setup_key_block(s))
 599                                 { ret= -1; goto end; }
 600
 601                         ret=ssl3_send_change_cipher_spec(s,
 602                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
 603
 604                         if (ret <= 0) goto end;
 605                         s->state=SSL3_ST_SW_FINISHED_A;
 606                         s->init_num=0;
 607
 608                         if (!s->method->ssl3_enc->change_cipher_state(s,
 609                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
 610                                 {
 611                                 ret= -1;
 612                                 goto end;
 613                                 }
 614
 615                         break;
 616
 617                 case SSL3_ST_SW_FINISHED_A:
 618                 case SSL3_ST_SW_FINISHED_B:
 619                         ret=ssl3_send_finished(s,
 620                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
 621                                 s->method->ssl3_enc->server_finished_label,
 622                                 s->method->ssl3_enc->server_finished_label_len);
 623                         if (ret <= 0) goto end;
 624                         s->state=SSL3_ST_SW_FLUSH;
 625                         if (s->hit)
 626                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 627                         else
 628                                 s->s3->tmp.next_state=SSL_ST_OK;
 629                         s->init_num=0;
 630                         break;
 631
 632                 case SSL_ST_OK:
 633                         /* clean a few things up */
 634                         ssl3_cleanup_key_block(s);
 635
 636                         BUF_MEM_free(s->init_buf);
 637                         s->init_buf=NULL;
 638
 639                         /* remove buffering on output */
 640                         ssl_free_wbio_buffer(s);
 641
 642                         s->init_num=0;
 643
 644                         if (s->new_session == 2) /* skipped if we just sent a HelloRequest */
 645                                 {
 646                                 /* actually not necessarily a 'new' session unless
 647                                  * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */
 648
 649                                 s->new_session=0;
 650
 651                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 652
 653                                 s->ctx->stats.sess_accept_good++;
 654                                 /* s->server=1; */
 655                                 s->handshake_func=ssl3_accept;
 656
 657                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 658                                 }
 659
 660                         ret = 1;
 661                         goto end;
 662                         /* break; */
 663
 664                 default:
 665                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
 666                         ret= -1;
 667                         goto end;
 668                         /* break; */
 669                         }
 670
 671                 if (!s->s3->tmp.reuse_message && !skip)
 672                         {
 673                         if (s->debug)
 674                                 {
 675                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 676                                         goto end;
 677                                 }
 678
 679
 680                         if ((cb != NULL) && (s->state != state))
 681                                 {
 682                                 new_state=s->state;
 683                                 s->state=state;
 684                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
 685                                 s->state=new_state;
 686                                 }
 687                         }
 688                 skip=0;
 689                 }
 690 end:
 691         /* BIO_flush(s->wbio); */
 692
 693         s->in_handshake--;
 694         if (cb != NULL)
 695                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 696         return(ret);
 697         }
 698
 699 int ssl3_send_hello_request(SSL *s)
 700         {
 701         unsigned char *p;
 702
 703         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
 704                 {
 705                 p=(unsigned char *)s->init_buf->data;
 706                 *(p++)=SSL3_MT_HELLO_REQUEST;
 707                 *(p++)=0;
 708                 *(p++)=0;
 709                 *(p++)=0;
 710
 711                 s->state=SSL3_ST_SW_HELLO_REQ_B;
 712                 /* number of bytes to write */
 713                 s->init_num=4;
 714                 s->init_off=0;
 715                 }
 716
 717         /* SSL3_ST_SW_HELLO_REQ_B */
 718         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 719         }
 720
 721 int ssl3_check_client_hello(SSL *s)
 722         {
 723         int ok;
 724         long n;
 725
 726         /* this function is called when we really expect a Certificate message,
 727          * so permit appropriate message length */
 728         n=s->method->ssl_get_message(s,
 729                 SSL3_ST_SR_CERT_A,
 730                 SSL3_ST_SR_CERT_B,
 731                 -1,
 732                 s->max_cert_list,
 733                 &ok);
 734         if (!ok) return((int)n);
 735         s->s3->tmp.reuse_message = 1;
 736         if (s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO)
 737                 {
 738                 /* Throw away what we have done so far in the current handshake,
 739                  * which will now be aborted. (A full SSL_clear would be too much.)
 740                  * I hope that tmp.dh is the only thing that may need to be cleared
 741                  * when a handshake is not completed ... */
 742 #ifndef OPENSSL_NO_DH
 743                 if (s->s3->tmp.dh != NULL)
 744                         {
 745                         DH_free(s->s3->tmp.dh);
 746                         s->s3->tmp.dh = NULL;
 747                         }
 748 #endif
 749                 return 2;
 750                 }
 751         return 1;
 752 }
 753
 754 int ssl3_get_client_hello(SSL *s)
 755         {
 756         int i,j,ok,al,ret= -1;
 757         unsigned int cookie_len;
 758         long n;
 759         unsigned long id;
 760         unsigned char *p,*d,*q;
 761         SSL_CIPHER *c;
 762 #ifndef OPENSSL_NO_COMP
 763         SSL_COMP *comp=NULL;
 764 #endif
 765         STACK_OF(SSL_CIPHER) *ciphers=NULL;
 766
 767         /* We do this so that we will respond with our native type.
 768          * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
 769          * This down switching should be handled by a different method.
 770          * If we are SSLv3, we will respond with SSLv3, even if prompted with
 771          * TLSv1.
 772          */
 773         if (s->state == SSL3_ST_SR_CLNT_HELLO_A)
 774                 {
 775                 s->state=SSL3_ST_SR_CLNT_HELLO_B;
 776                 }
 777         s->first_packet=1;
 778         n=s->method->ssl_get_message(s,
 779                 SSL3_ST_SR_CLNT_HELLO_B,
 780                 SSL3_ST_SR_CLNT_HELLO_C,
 781                 SSL3_MT_CLIENT_HELLO,
 782                 SSL3_RT_MAX_PLAIN_LENGTH,
 783                 &ok);
 784
 785         if (!ok) return((int)n);
 786         s->first_packet=0;
 787         d=p=(unsigned char *)s->init_msg;
 788
 789         /* use version from inside client hello, not from record header
 790          * (may differ: see RFC 2246, Appendix E, second paragraph) */
 791         s->client_version=(((int)p[0])<<8)|(int)p[1];
 792         p+=2;
 793
 794         if ((s->version == DTLS1_VERSION && s->client_version > s->version) ||
 795             (s->version != DTLS1_VERSION && s->client_version < s->version))
 796                 {
 797                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER);
 798                 if ((s->client_version>>8) == SSL3_VERSION_MAJOR)
 799                         {
 800                         /* similar to ssl3_get_record, send alert using remote version number */
 801                         s->version = s->client_version;
 802                         }
 803                 al = SSL_AD_PROTOCOL_VERSION;
 804                 goto f_err;
 805                 }
 806
 807         /* load the client random */
 808         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
 809         p+=SSL3_RANDOM_SIZE;
 810
 811         /* get the session-id */
 812         j= *(p++);
 813
 814         s->hit=0;
 815         /* Versions before 0.9.7 always allow session reuse during renegotiation
 816          * (i.e. when s->new_session is true), option
 817          * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is new with 0.9.7.
 818          * Maybe this optional behaviour should always have been the default,
 819          * but we cannot safely change the default behaviour (or new applications
 820          * might be written that become totally unsecure when compiled with
 821          * an earlier library version)
 822          */
 823         if ((s->new_session && (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION)))
 824                 {
 825                 if (!ssl_get_new_session(s,1))
 826                         goto err;
 827                 }
 828         else
 829                 {
 830                 i=ssl_get_prev_session(s, p, j, d + n);
 831                 if (i == 1)
 832                         { /* previous session */
 833                         s->hit=1;
 834                         }
 835                 else if (i == -1)
 836                         goto err;
 837                 else /* i == 0 */
 838                         {
 839                         if (!ssl_get_new_session(s,1))
 840                                 goto err;
 841                         }
 842                 }
 843
 844         p+=j;
 845
 846         if (s->version == DTLS1_VERSION)
 847                 {
 848                 /* cookie stuff */
 849                 cookie_len = *(p++);
 850
 851                 if ( (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) &&
 852                         s->d1->send_cookie == 0)
 853                         {
 854                         /* HelloVerifyMessage has already been sent */
 855                         if ( cookie_len != s->d1->cookie_len)
 856                                 {
 857                                 al = SSL_AD_HANDSHAKE_FAILURE;
 858                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
 859                                 goto f_err;
 860                                 }
 861                         }
 862
 863                 /*
 864                  * The ClientHello may contain a cookie even if the
 865                  * HelloVerify message has not been sent--make sure that it
 866                  * does not cause an overflow.
 867                  */
 868                 if ( cookie_len > sizeof(s->d1->rcvd_cookie))
 869                         {
 870                         /* too much data */
 871                         al = SSL_AD_DECODE_ERROR;
 872                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
 873                         goto f_err;
 874                         }
 875
 876                 /* verify the cookie if appropriate option is set. */
 877                 if ( (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) &&
 878                         cookie_len > 0)
 879                         {
 880                         memcpy(s->d1->rcvd_cookie, p, cookie_len);
 881
 882                         if ( s->ctx->app_verify_cookie_cb != NULL)
 883                                 {
 884                                 if ( s->ctx->app_verify_cookie_cb(s, s->d1->rcvd_cookie,
 885                                         cookie_len) == 0)
 886                                         {
 887                                         al=SSL_AD_HANDSHAKE_FAILURE;
 888                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
 889                                                 SSL_R_COOKIE_MISMATCH);
 890                                         goto f_err;
 891                                         }
 892                                 /* else cookie verification succeeded */
 893                                 }
 894                         else if ( memcmp(s->d1->rcvd_cookie, s->d1->cookie,
 895                                                   s->d1->cookie_len) != 0) /* default verification */
 896                                 {
 897                                         al=SSL_AD_HANDSHAKE_FAILURE;
 898                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
 899                                                 SSL_R_COOKIE_MISMATCH);
 900                                         goto f_err;
 901                                 }
 902                         }
 903
 904                 p += cookie_len;
 905                 }
 906
 907         n2s(p,i);
 908         if ((i == 0) && (j != 0))
 909                 {
 910                 /* we need a cipher if we are not resuming a session */
 911                 al=SSL_AD_ILLEGAL_PARAMETER;
 912                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
 913                 goto f_err;
 914                 }
 915         if ((p+i) >= (d+n))
 916                 {
 917                 /* not enough data */
 918                 al=SSL_AD_DECODE_ERROR;
 919                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 920                 goto f_err;
 921                 }
 922         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
 923                 == NULL))
 924                 {
 925                 goto err;
 926                 }
 927         p+=i;
 928
 929         /* If it is a hit, check that the cipher is in the list */
 930         if ((s->hit) && (i > 0))
 931                 {
 932                 j=0;
 933                 id=s->session->cipher->id;
 934
 935 #ifdef CIPHER_DEBUG
 936                 printf("client sent %d ciphers\n",sk_num(ciphers));
 937 #endif
 938                 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
 939                         {
 940                         c=sk_SSL_CIPHER_value(ciphers,i);
 941 #ifdef CIPHER_DEBUG
 942                         printf("client [%2d of %2d]:%s\n",
 943                                 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
 944 #endif
 945                         if (c->id == id)
 946                                 {
 947                                 j=1;
 948                                 break;
 949                                 }
 950                         }
 951                 if (j == 0 && (s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
 952                         {
 953                         /* Special case as client bug workaround: the previously used cipher may
 954                          * not be in the current list, the client instead might be trying to
 955                          * continue using a cipher that before wasn't chosen due to server
 956                          * preferences.  We'll have to reject the connection if the cipher is not
 957                          * enabled, though. */
 958                         c = sk_SSL_CIPHER_value(ciphers, 0);
 959                         if (sk_SSL_CIPHER_find(SSL_get_ciphers(s), c) >= 0)
 960                                 {
 961                                 s->session->cipher = c;
 962                                 j = 1;
 963                                 }
 964                         }
 965                 if (j == 0)
 966                         {
 967                         /* we need to have the cipher in the cipher
 968                          * list if we are asked to reuse it */
 969                         al=SSL_AD_ILLEGAL_PARAMETER;
 970                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
 971                         goto f_err;
 972                         }
 973                 }
 974
 975         /* compression */
 976         i= *(p++);
 977         if ((p+i) > (d+n))
 978                 {
 979                 /* not enough data */
 980                 al=SSL_AD_DECODE_ERROR;
 981                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 982                 goto f_err;
 983                 }
 984         q=p;
 985         for (j=0; j<i; j++)
 986                 {
 987                 if (p[j] == 0) break;
 988                 }
 989
 990         p+=i;
 991         if (j >= i)
 992                 {
 993                 /* no compress */
 994                 al=SSL_AD_DECODE_ERROR;
 995                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
 996                 goto f_err;
 997                 }
 998
 999 #ifndef OPENSSL_NO_TLSEXT
1000         /* TLS extensions*/
1001         if (s->version > SSL3_VERSION)
1002                 {
1003                 if (!ssl_parse_clienthello_tlsext(s,&p,d,n, &al))
1004                         {
1005                         /* 'al' set by ssl_parse_clienthello_tlsext */
1006                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_PARSE_TLSEXT);
1007                         goto f_err;
1008                         }
1009                 }
1010                 if (ssl_check_clienthello_tlsext(s) <= 0) {
1011                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
1012                         goto err;
1013                 }
1014
1015         /* Check if we want to use external pre-shared secret for this
1016          * handshake for not reused session only. We need to generate
1017          * server_random before calling tls_session_secret_cb in order to allow
1018          * SessionTicket processing to use it in key derivation. */
1019         {
1020                 unsigned long Time;
1021                 unsigned char *pos;
1022                 Time=(unsigned long)time(NULL);                 /* Time */
1023                 pos=s->s3->server_random;
1024                 l2n(Time,pos);
1025                 if (RAND_pseudo_bytes(pos,SSL3_RANDOM_SIZE-4) <= 0)
1026                         {
1027                         al=SSL_AD_INTERNAL_ERROR;
1028                         goto f_err;
1029                         }
1030         }
1031
1032         if (!s->hit && s->version >= TLS1_VERSION && s->tls_session_secret_cb)
1033                 {
1034                 SSL_CIPHER *pref_cipher=NULL;
1035
1036                 s->session->master_key_length=sizeof(s->session->master_key);
1037                 if(s->tls_session_secret_cb(s, s->session->master_key, &s->session->master_key_length,
1038                         ciphers, &pref_cipher, s->tls_session_secret_cb_arg))
1039                         {
1040                         s->hit=1;
1041                         s->session->ciphers=ciphers;
1042                         s->session->verify_result=X509_V_OK;
1043
1044                         ciphers=NULL;
1045
1046                         /* check if some cipher was preferred by call back */
1047                         pref_cipher=pref_cipher ? pref_cipher : ssl3_choose_cipher(s, s->session->ciphers, SSL_get_ciphers(s));
1048                         if (pref_cipher == NULL)
1049                                 {
1050                                 al=SSL_AD_HANDSHAKE_FAILURE;
1051                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1052                                 goto f_err;
1053                                 }
1054
1055                         s->session->cipher=pref_cipher;
1056
1057                         if (s->cipher_list)
1058                                 sk_SSL_CIPHER_free(s->cipher_list);
1059
1060                         if (s->cipher_list_by_id)
1061                                 sk_SSL_CIPHER_free(s->cipher_list_by_id);
1062
1063                         s->cipher_list = sk_SSL_CIPHER_dup(s->session->ciphers);
1064                         s->cipher_list_by_id = sk_SSL_CIPHER_dup(s->session->ciphers);
1065                         }
1066                 }
1067 #endif
1068
1069         /* Worst case, we will use the NULL compression, but if we have other
1070          * options, we will now look for them.  We have i-1 compression
1071          * algorithms from the client, starting at q. */
1072         s->s3->tmp.new_compression=NULL;
1073 #ifndef OPENSSL_NO_COMP
1074         if (!(s->options & SSL_OP_NO_COMPRESSION) && s->ctx->comp_methods)
1075                 { /* See if we have a match */
1076                 int m,nn,o,v,done=0;
1077
1078                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
1079                 for (m=0; m<nn; m++)
1080                         {
1081                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1082                         v=comp->id;
1083                         for (o=0; o<i; o++)
1084                                 {
1085                                 if (v == q[o])
1086                                         {
1087                                         done=1;
1088                                         break;
1089                                         }
1090                                 }
1091                         if (done) break;
1092                         }
1093                 if (done)
1094                         s->s3->tmp.new_compression=comp;
1095                 else
1096                         comp=NULL;
1097                 }
1098 #endif
1099
1100         /* Given s->session->ciphers and SSL_get_ciphers, we must
1101          * pick a cipher */
1102
1103         if (!s->hit)
1104                 {
1105 #ifdef OPENSSL_NO_COMP
1106                 s->session->compress_meth=0;
1107 #else
1108                 s->session->compress_meth=(comp == NULL)?0:comp->id;
1109 #endif
1110                 if (s->session->ciphers != NULL)
1111                         sk_SSL_CIPHER_free(s->session->ciphers);
1112                 s->session->ciphers=ciphers;
1113                 if (ciphers == NULL)
1114                         {
1115                         al=SSL_AD_ILLEGAL_PARAMETER;
1116                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
1117                         goto f_err;
1118                         }
1119                 ciphers=NULL;
1120                 c=ssl3_choose_cipher(s,s->session->ciphers,
1121                                      SSL_get_ciphers(s));
1122
1123                 if (c == NULL)
1124                         {
1125                         al=SSL_AD_HANDSHAKE_FAILURE;
1126                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1127                         goto f_err;
1128                         }
1129                 s->s3->tmp.new_cipher=c;
1130                 }
1131         else
1132                 {
1133                 /* Session-id reuse */
1134 #ifdef REUSE_CIPHER_BUG
1135                 STACK_OF(SSL_CIPHER) *sk;
1136                 SSL_CIPHER *nc=NULL;
1137                 SSL_CIPHER *ec=NULL;
1138
1139                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
1140                         {
1141                         sk=s->session->ciphers;
1142                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
1143                                 {
1144                                 c=sk_SSL_CIPHER_value(sk,i);
1145                                 if (c->algorithm_enc & SSL_eNULL)
1146                                         nc=c;
1147                                 if (SSL_C_IS_EXPORT(c))
1148                                         ec=c;
1149                                 }
1150                         if (nc != NULL)
1151                                 s->s3->tmp.new_cipher=nc;
1152                         else if (ec != NULL)
1153                                 s->s3->tmp.new_cipher=ec;
1154                         else
1155                                 s->s3->tmp.new_cipher=s->session->cipher;
1156                         }
1157                 else
1158 #endif
1159                 s->s3->tmp.new_cipher=s->session->cipher;
1160                 }
1161
1162         if (!ssl3_digest_cached_records(s))
1163                 goto f_err;
1164
1165         /* we now have the following setup.
1166          * client_random
1167          * cipher_list          - our prefered list of ciphers
1168          * ciphers              - the clients prefered list of ciphers
1169          * compression          - basically ignored right now
1170          * ssl version is set   - sslv3
1171          * s->session           - The ssl session has been setup.
1172          * s->hit               - session reuse flag
1173          * s->tmp.new_cipher    - the new cipher to use.
1174          */
1175
1176         ret=1;
1177         if (0)
1178                 {
1179 f_err:
1180                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1181                 }
1182 err:
1183         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
1184         return(ret);
1185         }
1186
1187 int ssl3_send_server_hello(SSL *s)
1188         {
1189         unsigned char *buf;
1190         unsigned char *p,*d;
1191         int i,sl;
1192         unsigned long l;
1193 #ifdef OPENSSL_NO_TLSEXT
1194         unsigned long Time;
1195 #endif
1196
1197         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
1198                 {
1199                 buf=(unsigned char *)s->init_buf->data;
1200 #ifdef OPENSSL_NO_TLSEXT
1201                 p=s->s3->server_random;
1202                 /* Generate server_random if it was not needed previously */
1203                 Time=(unsigned long)time(NULL);                 /* Time */
1204                 l2n(Time,p);
1205                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
1206                         return -1;
1207 #endif
1208                 /* Do the message type and length last */
1209                 d=p= &(buf[4]);
1210
1211                 *(p++)=s->version>>8;
1212                 *(p++)=s->version&0xff;
1213
1214                 /* Random stuff */
1215                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
1216                 p+=SSL3_RANDOM_SIZE;
1217
1218                 /* now in theory we have 3 options to sending back the
1219                  * session id.  If it is a re-use, we send back the
1220                  * old session-id, if it is a new session, we send
1221                  * back the new session-id or we send back a 0 length
1222                  * session-id if we want it to be single use.
1223                  * Currently I will not implement the '0' length session-id
1224                  * 12-Jan-98 - I'll now support the '0' length stuff.
1225                  *
1226                  * We also have an additional case where stateless session
1227                  * resumption is successful: we always send back the old
1228                  * session id. In this case s->hit is non zero: this can
1229                  * only happen if stateless session resumption is succesful
1230                  * if session caching is disabled so existing functionality
1231                  * is unaffected.
1232                  */
1233                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)
1234                         && !s->hit)
1235                         s->session->session_id_length=0;
1236
1237                 sl=s->session->session_id_length;
1238                 if (sl > (int)sizeof(s->session->session_id))
1239                         {
1240                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1241                         return -1;
1242                         }
1243                 *(p++)=sl;
1244                 memcpy(p,s->session->session_id,sl);
1245                 p+=sl;
1246
1247                 /* put the cipher */
1248                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
1249                 p+=i;
1250
1251                 /* put the compression method */
1252 #ifdef OPENSSL_NO_COMP
1253                         *(p++)=0;
1254 #else
1255                 if (s->s3->tmp.new_compression == NULL)
1256                         *(p++)=0;
1257                 else
1258                         *(p++)=s->s3->tmp.new_compression->id;
1259 #endif
1260 #ifndef OPENSSL_NO_TLSEXT
1261                 if (ssl_prepare_serverhello_tlsext(s) <= 0)
1262                         {
1263                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
1264                         return -1;
1265                         }
1266                 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
1267                         {
1268                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
1269                         return -1;
1270                         }
1271 #endif
1272                 /* do the header */
1273                 l=(p-d);
1274                 d=buf;
1275                 *(d++)=SSL3_MT_SERVER_HELLO;
1276                 l2n3(l,d);
1277
1278                 s->state=SSL3_ST_SW_SRVR_HELLO_B;
1279                 /* number of bytes to write */
1280                 s->init_num=p-buf;
1281                 s->init_off=0;
1282                 }
1283
1284         /* SSL3_ST_SW_SRVR_HELLO_B */
1285         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1286         }
1287
1288 int ssl3_send_server_done(SSL *s)
1289         {
1290         unsigned char *p;
1291
1292         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1293                 {
1294                 p=(unsigned char *)s->init_buf->data;
1295
1296                 /* do the header */
1297                 *(p++)=SSL3_MT_SERVER_DONE;
1298                 *(p++)=0;
1299                 *(p++)=0;
1300                 *(p++)=0;
1301
1302                 s->state=SSL3_ST_SW_SRVR_DONE_B;
1303                 /* number of bytes to write */
1304                 s->init_num=4;
1305                 s->init_off=0;
1306                 }
1307
1308         /* SSL3_ST_SW_SRVR_DONE_B */
1309         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1310         }
1311
1312 int ssl3_send_server_key_exchange(SSL *s)
1313         {
1314 #ifndef OPENSSL_NO_RSA
1315         unsigned char *q;
1316         int j,num;
1317         RSA *rsa;
1318         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1319         unsigned int u;
1320 #endif
1321 #ifndef OPENSSL_NO_DH
1322         DH *dh=NULL,*dhp;
1323 #endif
1324 #ifndef OPENSSL_NO_ECDH
1325         EC_KEY *ecdh=NULL, *ecdhp;
1326         unsigned char *encodedPoint = NULL;
1327         int encodedlen = 0;
1328         int curve_id = 0;
1329         BN_CTX *bn_ctx = NULL;
1330 #endif
1331         EVP_PKEY *pkey;
1332         unsigned char *p,*d;
1333         int al,i;
1334         unsigned long type;
1335         int n;
1336         CERT *cert;
1337         BIGNUM *r[4];
1338         int nr[4],kn;
1339         BUF_MEM *buf;
1340         EVP_MD_CTX md_ctx;
1341
1342         EVP_MD_CTX_init(&md_ctx);
1343         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1344                 {
1345                 type=s->s3->tmp.new_cipher->algorithm_mkey;
1346                 cert=s->cert;
1347
1348                 buf=s->init_buf;
1349
1350                 r[0]=r[1]=r[2]=r[3]=NULL;
1351                 n=0;
1352 #ifndef OPENSSL_NO_RSA
1353                 if (type & SSL_kRSA)
1354                         {
1355                         rsa=cert->rsa_tmp;
1356                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1357                                 {
1358                                 rsa=s->cert->rsa_tmp_cb(s,
1359                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1360                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1361                                 if(rsa == NULL)
1362                                 {
1363                                         al=SSL_AD_HANDSHAKE_FAILURE;
1364                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1365                                         goto f_err;
1366                                 }
1367                                 RSA_up_ref(rsa);
1368                                 cert->rsa_tmp=rsa;
1369                                 }
1370                         if (rsa == NULL)
1371                                 {
1372                                 al=SSL_AD_HANDSHAKE_FAILURE;
1373                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1374                                 goto f_err;
1375                                 }
1376                         r[0]=rsa->n;
1377                         r[1]=rsa->e;
1378                         s->s3->tmp.use_rsa_tmp=1;
1379                         }
1380                 else
1381 #endif
1382 #ifndef OPENSSL_NO_DH
1383                         if (type & SSL_kEDH)
1384                         {
1385                         dhp=cert->dh_tmp;
1386                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1387                                 dhp=s->cert->dh_tmp_cb(s,
1388                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1389                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1390                         if (dhp == NULL)
1391                                 {
1392                                 al=SSL_AD_HANDSHAKE_FAILURE;
1393                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1394                                 goto f_err;
1395                                 }
1396
1397                         if (s->s3->tmp.dh != NULL)
1398                                 {
1399                                 DH_free(dh);
1400                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1401                                 goto err;
1402                                 }
1403
1404                         if ((dh=DHparams_dup(dhp)) == NULL)
1405                                 {
1406                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1407                                 goto err;
1408                                 }
1409
1410                         s->s3->tmp.dh=dh;
1411                         if ((dhp->pub_key == NULL ||
1412                              dhp->priv_key == NULL ||
1413                              (s->options & SSL_OP_SINGLE_DH_USE)))
1414                                 {
1415                                 if(!DH_generate_key(dh))
1416                                     {
1417                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1418                                            ERR_R_DH_LIB);
1419                                     goto err;
1420                                     }
1421                                 }
1422                         else
1423                                 {
1424                                 dh->pub_key=BN_dup(dhp->pub_key);
1425                                 dh->priv_key=BN_dup(dhp->priv_key);
1426                                 if ((dh->pub_key == NULL) ||
1427                                         (dh->priv_key == NULL))
1428                                         {
1429                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1430                                         goto err;
1431                                         }
1432                                 }
1433                         r[0]=dh->p;
1434                         r[1]=dh->g;
1435                         r[2]=dh->pub_key;
1436                         }
1437                 else
1438 #endif
1439 #ifndef OPENSSL_NO_ECDH
1440                         if (type & SSL_kEECDH)
1441                         {
1442                         const EC_GROUP *group;
1443
1444                         ecdhp=cert->ecdh_tmp;
1445                         if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
1446                                 {
1447                                 ecdhp=s->cert->ecdh_tmp_cb(s,
1448                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1449                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1450                                 }
1451                         if (ecdhp == NULL)
1452                                 {
1453                                 al=SSL_AD_HANDSHAKE_FAILURE;
1454                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1455                                 goto f_err;
1456                                 }
1457
1458                         if (s->s3->tmp.ecdh != NULL)
1459                                 {
1460                                 EC_KEY_free(s->s3->tmp.ecdh);
1461                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1462                                 goto err;
1463                                 }
1464
1465                         /* Duplicate the ECDH structure. */
1466                         if (ecdhp == NULL)
1467                                 {
1468                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1469                                 goto err;
1470                                 }
1471                         if (!EC_KEY_up_ref(ecdhp))
1472                                 {
1473                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1474                                 goto err;
1475                                 }
1476                         ecdh = ecdhp;
1477
1478                         s->s3->tmp.ecdh=ecdh;
1479                         if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1480                             (EC_KEY_get0_private_key(ecdh) == NULL) ||
1481                             (s->options & SSL_OP_SINGLE_ECDH_USE))
1482                                 {
1483                                 if(!EC_KEY_generate_key(ecdh))
1484                                     {
1485                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1486                                     goto err;
1487                                     }
1488                                 }
1489
1490                         if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1491                             (EC_KEY_get0_public_key(ecdh)  == NULL) ||
1492                             (EC_KEY_get0_private_key(ecdh) == NULL))
1493                                 {
1494                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1495                                 goto err;
1496                                 }
1497
1498                         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1499                             (EC_GROUP_get_degree(group) > 163))
1500                                 {
1501                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1502                                 goto err;
1503                                 }
1504
1505                         /* XXX: For now, we only support ephemeral ECDH
1506                          * keys over named (not generic) curves. For
1507                          * supported named curves, curve_id is non-zero.
1508                          */
1509                         if ((curve_id =
1510                             tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1511                             == 0)
1512                                 {
1513                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1514                                 goto err;
1515                                 }
1516
1517                         /* Encode the public key.
1518                          * First check the size of encoding and
1519                          * allocate memory accordingly.
1520                          */
1521                         encodedlen = EC_POINT_point2oct(group,
1522                             EC_KEY_get0_public_key(ecdh),
1523                             POINT_CONVERSION_UNCOMPRESSED,
1524                             NULL, 0, NULL);
1525
1526                         encodedPoint = (unsigned char *)
1527                             OPENSSL_malloc(encodedlen*sizeof(unsigned char));
1528                         bn_ctx = BN_CTX_new();
1529                         if ((encodedPoint == NULL) || (bn_ctx == NULL))
1530                                 {
1531                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1532                                 goto err;
1533                                 }
1534
1535
1536                         encodedlen = EC_POINT_point2oct(group,
1537                             EC_KEY_get0_public_key(ecdh),
1538                             POINT_CONVERSION_UNCOMPRESSED,
1539                             encodedPoint, encodedlen, bn_ctx);
1540
1541                         if (encodedlen == 0)
1542                                 {
1543                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1544                                 goto err;
1545                                 }
1546
1547                         BN_CTX_free(bn_ctx);  bn_ctx=NULL;
1548
1549                         /* XXX: For now, we only support named (not
1550                          * generic) curves in ECDH ephemeral key exchanges.
1551                          * In this situation, we need four additional bytes
1552                          * to encode the entire ServerECDHParams
1553                          * structure.
1554                          */
1555                         n = 4 + encodedlen;
1556
1557                         /* We'll generate the serverKeyExchange message
1558                          * explicitly so we can set these to NULLs
1559                          */
1560                         r[0]=NULL;
1561                         r[1]=NULL;
1562                         r[2]=NULL;
1563                         r[3]=NULL;
1564                         }
1565                 else
1566 #endif /* !OPENSSL_NO_ECDH */
1567 #ifndef OPENSSL_NO_PSK
1568                         if (type & SSL_kPSK)
1569                                 {
1570                                 /* reserve size for record length and PSK identity hint*/
1571                                 n+=2+strlen(s->ctx->psk_identity_hint);
1572                                 }
1573                         else
1574 #endif /* !OPENSSL_NO_PSK */
1575                         {
1576                         al=SSL_AD_HANDSHAKE_FAILURE;
1577                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1578                         goto f_err;
1579                         }
1580                 for (i=0; r[i] != NULL; i++)
1581                         {
1582                         nr[i]=BN_num_bytes(r[i]);
1583                         n+=2+nr[i];
1584                         }
1585
1586                 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1587                         && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
1588                         {
1589                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
1590                                 == NULL)
1591                                 {
1592                                 al=SSL_AD_DECODE_ERROR;
1593                                 goto f_err;
1594                                 }
1595                         kn=EVP_PKEY_size(pkey);
1596                         }
1597                 else
1598                         {
1599                         pkey=NULL;
1600                         kn=0;
1601                         }
1602
1603                 if (!BUF_MEM_grow_clean(buf,n+4+kn))
1604                         {
1605                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1606                         goto err;
1607                         }
1608                 d=(unsigned char *)s->init_buf->data;
1609                 p= &(d[4]);
1610
1611                 for (i=0; r[i] != NULL; i++)
1612                         {
1613                         s2n(nr[i],p);
1614                         BN_bn2bin(r[i],p);
1615                         p+=nr[i];
1616                         }
1617
1618 #ifndef OPENSSL_NO_ECDH
1619                 if (type & SSL_kEECDH)
1620                         {
1621                         /* XXX: For now, we only support named (not generic) curves.
1622                          * In this situation, the serverKeyExchange message has:
1623                          * [1 byte CurveType], [2 byte CurveName]
1624                          * [1 byte length of encoded point], followed by
1625                          * the actual encoded point itself
1626                          */
1627                         *p = NAMED_CURVE_TYPE;
1628                         p += 1;
1629                         *p = 0;
1630                         p += 1;
1631                         *p = curve_id;
1632                         p += 1;
1633                         *p = encodedlen;
1634                         p += 1;
1635                         memcpy((unsigned char*)p,
1636                             (unsigned char *)encodedPoint,
1637                             encodedlen);
1638                         OPENSSL_free(encodedPoint);
1639                         p += encodedlen;
1640                         }
1641 #endif
1642
1643 #ifndef OPENSSL_NO_PSK
1644                 if (type & SSL_kPSK)
1645                         {
1646                         /* copy PSK identity hint */
1647                         s2n(strlen(s->ctx->psk_identity_hint), p);
1648                         strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
1649                         p+=strlen(s->ctx->psk_identity_hint);
1650                         }
1651 #endif
1652
1653                 /* not anonymous */
1654                 if (pkey != NULL)
1655                         {
1656                         /* n is the length of the params, they start at &(d[4])
1657                          * and p points to the space at the end. */
1658 #ifndef OPENSSL_NO_RSA
1659                         if (pkey->type == EVP_PKEY_RSA)
1660                                 {
1661                                 q=md_buf;
1662                                 j=0;
1663                                 for (num=2; num > 0; num--)
1664                                         {
1665                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1666                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1667                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1668                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1669                                         EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1670                                         EVP_DigestFinal_ex(&md_ctx,q,
1671                                                 (unsigned int *)&i);
1672                                         q+=i;
1673                                         j+=i;
1674                                         }
1675                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1676                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1677                                         {
1678                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1679                                         goto err;
1680                                         }
1681                                 s2n(u,p);
1682                                 n+=u+2;
1683                                 }
1684                         else
1685 #endif
1686 #if !defined(OPENSSL_NO_DSA)
1687                                 if (pkey->type == EVP_PKEY_DSA)
1688                                 {
1689                                 /* lets do DSS */
1690                                 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
1691                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1692                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1693                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1694                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1695                                         (unsigned int *)&i,pkey))
1696                                         {
1697                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1698                                         goto err;
1699                                         }
1700                                 s2n(i,p);
1701                                 n+=i+2;
1702                                 }
1703                         else
1704 #endif
1705 #if !defined(OPENSSL_NO_ECDSA)
1706                                 if (pkey->type == EVP_PKEY_EC)
1707                                 {
1708                                 /* let's do ECDSA */
1709                                 EVP_SignInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1710                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1711                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1712                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1713                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1714                                         (unsigned int *)&i,pkey))
1715                                         {
1716                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_ECDSA);
1717                                         goto err;
1718                                         }
1719                                 s2n(i,p);
1720                                 n+=i+2;
1721                                 }
1722                         else
1723 #endif
1724                                 {
1725                                 /* Is this error check actually needed? */
1726                                 al=SSL_AD_HANDSHAKE_FAILURE;
1727                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1728                                 goto f_err;
1729                                 }
1730                         }
1731
1732                 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
1733                 l2n3(n,d);
1734
1735                 /* we should now have things packed up, so lets send
1736                  * it off */
1737                 s->init_num=n+4;
1738                 s->init_off=0;
1739                 }
1740
1741         s->state = SSL3_ST_SW_KEY_EXCH_B;
1742         EVP_MD_CTX_cleanup(&md_ctx);
1743         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1744 f_err:
1745         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1746 err:
1747 #ifndef OPENSSL_NO_ECDH
1748         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1749         BN_CTX_free(bn_ctx);
1750 #endif
1751         EVP_MD_CTX_cleanup(&md_ctx);
1752         return(-1);
1753         }
1754
1755 int ssl3_send_certificate_request(SSL *s)
1756         {
1757         unsigned char *p,*d;
1758         int i,j,nl,off,n;
1759         STACK_OF(X509_NAME) *sk=NULL;
1760         X509_NAME *name;
1761         BUF_MEM *buf;
1762
1763         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1764                 {
1765                 buf=s->init_buf;
1766
1767                 d=p=(unsigned char *)&(buf->data[4]);
1768
1769                 /* get the list of acceptable cert types */
1770                 p++;
1771                 n=ssl3_get_req_cert_type(s,p);
1772                 d[0]=n;
1773                 p+=n;
1774                 n++;
1775
1776                 off=n;
1777                 p+=2;
1778                 n+=2;
1779
1780                 sk=SSL_get_client_CA_list(s);
1781                 nl=0;
1782                 if (sk != NULL)
1783                         {
1784                         for (i=0; i<sk_X509_NAME_num(sk); i++)
1785                                 {
1786                                 name=sk_X509_NAME_value(sk,i);
1787                                 j=i2d_X509_NAME(name,NULL);
1788                                 if (!BUF_MEM_grow_clean(buf,4+n+j+2))
1789                                         {
1790                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1791                                         goto err;
1792                                         }
1793                                 p=(unsigned char *)&(buf->data[4+n]);
1794                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1795                                         {
1796                                         s2n(j,p);
1797                                         i2d_X509_NAME(name,&p);
1798                                         n+=2+j;
1799                                         nl+=2+j;
1800                                         }
1801                                 else
1802                                         {
1803                                         d=p;
1804                                         i2d_X509_NAME(name,&p);
1805                                         j-=2; s2n(j,d); j+=2;
1806                                         n+=j;
1807                                         nl+=j;
1808                                         }
1809                                 }
1810                         }
1811                 /* else no CA names */
1812                 p=(unsigned char *)&(buf->data[4+off]);
1813                 s2n(nl,p);
1814
1815                 d=(unsigned char *)buf->data;
1816                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1817                 l2n3(n,d);
1818
1819                 /* we should now have things packed up, so lets send
1820                  * it off */
1821
1822                 s->init_num=n+4;
1823                 s->init_off=0;
1824 #ifdef NETSCAPE_HANG_BUG
1825                 p=(unsigned char *)s->init_buf->data + s->init_num;
1826
1827                 /* do the header */
1828                 *(p++)=SSL3_MT_SERVER_DONE;
1829                 *(p++)=0;
1830                 *(p++)=0;
1831                 *(p++)=0;
1832                 s->init_num += 4;
1833 #endif
1834
1835                 s->state = SSL3_ST_SW_CERT_REQ_B;
1836                 }
1837
1838         /* SSL3_ST_SW_CERT_REQ_B */
1839         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1840 err:
1841         return(-1);
1842         }
1843
1844 int ssl3_get_client_key_exchange(SSL *s)
1845         {
1846         int i,al,ok;
1847         long n;
1848         unsigned long alg_k;
1849         unsigned char *p;
1850 #ifndef OPENSSL_NO_RSA
1851         RSA *rsa=NULL;
1852         EVP_PKEY *pkey=NULL;
1853 #endif
1854 #ifndef OPENSSL_NO_DH
1855         BIGNUM *pub=NULL;
1856         DH *dh_srvr;
1857 #endif
1858 #ifndef OPENSSL_NO_KRB5
1859         KSSL_ERR kssl_err;
1860 #endif /* OPENSSL_NO_KRB5 */
1861
1862 #ifndef OPENSSL_NO_ECDH
1863         EC_KEY *srvr_ecdh = NULL;
1864         EVP_PKEY *clnt_pub_pkey = NULL;
1865         EC_POINT *clnt_ecpoint = NULL;
1866         BN_CTX *bn_ctx = NULL;
1867 #endif
1868
1869         n=s->method->ssl_get_message(s,
1870                 SSL3_ST_SR_KEY_EXCH_A,
1871                 SSL3_ST_SR_KEY_EXCH_B,
1872                 SSL3_MT_CLIENT_KEY_EXCHANGE,
1873                 2048, /* ??? */
1874                 &ok);
1875
1876         if (!ok) return((int)n);
1877         p=(unsigned char *)s->init_msg;
1878
1879         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
1880
1881 #ifndef OPENSSL_NO_RSA
1882         if (alg_k & SSL_kRSA)
1883                 {
1884                 /* FIX THIS UP EAY EAY EAY EAY */
1885                 if (s->s3->tmp.use_rsa_tmp)
1886                         {
1887                         if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
1888                                 rsa=s->cert->rsa_tmp;
1889                         /* Don't do a callback because rsa_tmp should
1890                          * be sent already */
1891                         if (rsa == NULL)
1892                                 {
1893                                 al=SSL_AD_HANDSHAKE_FAILURE;
1894                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
1895                                 goto f_err;
1896
1897                                 }
1898                         }
1899                 else
1900                         {
1901                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
1902                         if (    (pkey == NULL) ||
1903                                 (pkey->type != EVP_PKEY_RSA) ||
1904                                 (pkey->pkey.rsa == NULL))
1905                                 {
1906                                 al=SSL_AD_HANDSHAKE_FAILURE;
1907                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
1908                                 goto f_err;
1909                                 }
1910                         rsa=pkey->pkey.rsa;
1911                         }
1912
1913                 /* TLS and [incidentally] DTLS{0xFEFF} */
1914                 if (s->version > SSL3_VERSION)
1915                         {
1916                         n2s(p,i);
1917                         if (n != i+2)
1918                                 {
1919                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
1920                                         {
1921                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
1922                                         goto err;
1923                                         }
1924                                 else
1925                                         p-=2;
1926                                 }
1927                         else
1928                                 n=i;
1929                         }
1930
1931                 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
1932
1933                 al = -1;
1934
1935                 if (i != SSL_MAX_MASTER_KEY_LENGTH)
1936                         {
1937                         al=SSL_AD_DECODE_ERROR;
1938                         /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT); */
1939                         }
1940
1941                 if ((al == -1) && !((p[0] == (s->client_version>>8)) && (p[1] == (s->client_version & 0xff))))
1942                         {
1943                         /* The premaster secret must contain the same version number as the
1944                          * ClientHello to detect version rollback attacks (strangely, the
1945                          * protocol does not offer such protection for DH ciphersuites).
1946                          * However, buggy clients exist that send the negotiated protocol
1947                          * version instead if the server does not support the requested
1948                          * protocol version.
1949                          * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
1950                         if (!((s->options & SSL_OP_TLS_ROLLBACK_BUG) &&
1951                                 (p[0] == (s->version>>8)) && (p[1] == (s->version & 0xff))))
1952                                 {
1953                                 al=SSL_AD_DECODE_ERROR;
1954                                 /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER); */
1955
1956                                 /* The Klima-Pokorny-Rosa extension of Bleichenbacher's attack
1957                                  * (http://eprint.iacr.org/2003/052/) exploits the version
1958                                  * number check as a "bad version oracle" -- an alert would
1959                                  * reveal that the plaintext corresponding to some ciphertext
1960                                  * made up by the adversary is properly formatted except
1961                                  * that the version number is wrong.  To avoid such attacks,
1962                                  * we should treat this just like any other decryption error. */
1963                                 }
1964                         }
1965
1966                 if (al != -1)
1967                         {
1968                         /* Some decryption failure -- use random value instead as countermeasure
1969                          * against Bleichenbacher's attack on PKCS #1 v1.5 RSA padding
1970                          * (see RFC 2246, section 7.4.7.1). */
1971                         ERR_clear_error();
1972                         i = SSL_MAX_MASTER_KEY_LENGTH;
1973                         p[0] = s->client_version >> 8;
1974                         p[1] = s->client_version & 0xff;
1975                         if (RAND_pseudo_bytes(p+2, i-2) <= 0) /* should be RAND_bytes, but we cannot work around a failure */
1976                                 goto err;
1977                         }
1978
1979                 s->session->master_key_length=
1980                         s->method->ssl3_enc->generate_master_secret(s,
1981                                 s->session->master_key,
1982                                 p,i);
1983                 OPENSSL_cleanse(p,i);
1984                 }
1985         else
1986 #endif
1987 #ifndef OPENSSL_NO_DH
1988                 if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1989                 {
1990                 n2s(p,i);
1991                 if (n != i+2)
1992                         {
1993                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
1994                                 {
1995                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
1996                                 goto err;
1997                                 }
1998                         else
1999                                 {
2000                                 p-=2;
2001                                 i=(int)n;
2002                                 }
2003                         }
2004
2005                 if (n == 0L) /* the parameters are in the cert */
2006                         {
2007                         al=SSL_AD_HANDSHAKE_FAILURE;
2008                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_DECODE_DH_CERTS);
2009                         goto f_err;
2010                         }
2011                 else
2012                         {
2013                         if (s->s3->tmp.dh == NULL)
2014                                 {
2015                                 al=SSL_AD_HANDSHAKE_FAILURE;
2016                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
2017                                 goto f_err;
2018                                 }
2019                         else
2020                                 dh_srvr=s->s3->tmp.dh;
2021                         }
2022
2023                 pub=BN_bin2bn(p,i,NULL);
2024                 if (pub == NULL)
2025                         {
2026                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
2027                         goto err;
2028                         }
2029
2030                 i=DH_compute_key(p,pub,dh_srvr);
2031
2032                 if (i <= 0)
2033                         {
2034                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2035                         goto err;
2036                         }
2037
2038                 DH_free(s->s3->tmp.dh);
2039                 s->s3->tmp.dh=NULL;
2040
2041                 BN_clear_free(pub);
2042                 pub=NULL;
2043                 s->session->master_key_length=
2044                         s->method->ssl3_enc->generate_master_secret(s,
2045                                 s->session->master_key,p,i);
2046                 OPENSSL_cleanse(p,i);
2047                 }
2048         else
2049 #endif
2050 #ifndef OPENSSL_NO_KRB5
2051         if (alg_k & SSL_kKRB5)
2052                 {
2053                 krb5_error_code         krb5rc;
2054                 krb5_data               enc_ticket;
2055                 krb5_data               authenticator;
2056                 krb5_data               enc_pms;
2057                 KSSL_CTX                *kssl_ctx = s->kssl_ctx;
2058                 EVP_CIPHER_CTX          ciph_ctx;
2059                 EVP_CIPHER              *enc = NULL;
2060                 unsigned char           iv[EVP_MAX_IV_LENGTH];
2061                 unsigned char           pms[SSL_MAX_MASTER_KEY_LENGTH
2062                                                + EVP_MAX_BLOCK_LENGTH];
2063                 int                  padl, outl;
2064                 krb5_timestamp          authtime = 0;
2065                 krb5_ticket_times       ttimes;
2066
2067                 EVP_CIPHER_CTX_init(&ciph_ctx);
2068
2069                 if (!kssl_ctx)  kssl_ctx = kssl_ctx_new();
2070
2071                 n2s(p,i);
2072                 enc_ticket.length = i;
2073
2074                 if (n < enc_ticket.length + 6)
2075                         {
2076                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2077                                 SSL_R_DATA_LENGTH_TOO_LONG);
2078                         goto err;
2079                         }
2080
2081                 enc_ticket.data = (char *)p;
2082                 p+=enc_ticket.length;
2083
2084                 n2s(p,i);
2085                 authenticator.length = i;
2086
2087                 if (n < enc_ticket.length + authenticator.length + 6)
2088                         {
2089                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2090                                 SSL_R_DATA_LENGTH_TOO_LONG);
2091                         goto err;
2092                         }
2093
2094                 authenticator.data = (char *)p;
2095                 p+=authenticator.length;
2096
2097                 n2s(p,i);
2098                 enc_pms.length = i;
2099                 enc_pms.data = (char *)p;
2100                 p+=enc_pms.length;
2101
2102                 /* Note that the length is checked again below,
2103                 ** after decryption
2104                 */
2105                 if(enc_pms.length > sizeof pms)
2106                         {
2107                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2108                                SSL_R_DATA_LENGTH_TOO_LONG);
2109                         goto err;
2110                         }
2111
2112                 if (n != (long)(enc_ticket.length + authenticator.length +
2113                                                 enc_pms.length + 6))
2114                         {
2115                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2116                                 SSL_R_DATA_LENGTH_TOO_LONG);
2117                         goto err;
2118                         }
2119
2120                 if ((krb5rc = kssl_sget_tkt(kssl_ctx, &enc_ticket, &ttimes,
2121                                         &kssl_err)) != 0)
2122                         {
2123 #ifdef KSSL_DEBUG
2124                         printf("kssl_sget_tkt rtn %d [%d]\n",
2125                                 krb5rc, kssl_err.reason);
2126                         if (kssl_err.text)
2127                                 printf("kssl_err text= %s\n", kssl_err.text);
2128 #endif  /* KSSL_DEBUG */
2129                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2130                                 kssl_err.reason);
2131                         goto err;
2132                         }
2133
2134                 /*  Note: no authenticator is not considered an error,
2135                 **  but will return authtime == 0.
2136                 */
2137                 if ((krb5rc = kssl_check_authent(kssl_ctx, &authenticator,
2138                                         &authtime, &kssl_err)) != 0)
2139                         {
2140 #ifdef KSSL_DEBUG
2141                         printf("kssl_check_authent rtn %d [%d]\n",
2142                                 krb5rc, kssl_err.reason);
2143                         if (kssl_err.text)
2144                                 printf("kssl_err text= %s\n", kssl_err.text);
2145 #endif  /* KSSL_DEBUG */
2146                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2147                                 kssl_err.reason);
2148                         goto err;
2149                         }
2150
2151                 if ((krb5rc = kssl_validate_times(authtime, &ttimes)) != 0)
2152                         {
2153                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, krb5rc);
2154                         goto err;
2155                         }
2156
2157 #ifdef KSSL_DEBUG
2158                 kssl_ctx_show(kssl_ctx);
2159 #endif  /* KSSL_DEBUG */
2160
2161                 enc = kssl_map_enc(kssl_ctx->enctype);
2162                 if (enc == NULL)
2163                     goto err;
2164
2165                 memset(iv, 0, sizeof iv);       /* per RFC 1510 */
2166
2167                 if (!EVP_DecryptInit_ex(&ciph_ctx,enc,NULL,kssl_ctx->key,iv))
2168                         {
2169                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2170                                 SSL_R_DECRYPTION_FAILED);
2171                         goto err;
2172                         }
2173                 if (!EVP_DecryptUpdate(&ciph_ctx, pms,&outl,
2174                                         (unsigned char *)enc_pms.data, enc_pms.length))
2175                         {
2176                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2177                                 SSL_R_DECRYPTION_FAILED);
2178                         goto err;
2179                         }
2180                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2181                         {
2182                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2183                                 SSL_R_DATA_LENGTH_TOO_LONG);
2184                         goto err;
2185                         }
2186                 if (!EVP_DecryptFinal_ex(&ciph_ctx,&(pms[outl]),&padl))
2187                         {
2188                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2189                                 SSL_R_DECRYPTION_FAILED);
2190                         goto err;
2191                         }
2192                 outl += padl;
2193                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2194                         {
2195                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2196                                 SSL_R_DATA_LENGTH_TOO_LONG);
2197                         goto err;
2198                         }
2199                 if (!((p[0] == (s->client_version>>8)) && (p[1] == (s->client_version & 0xff))))
2200                     {
2201                     /* The premaster secret must contain the same version number as the
2202                      * ClientHello to detect version rollback attacks (strangely, the
2203                      * protocol does not offer such protection for DH ciphersuites).
2204                      * However, buggy clients exist that send random bytes instead of
2205                      * the protocol version.
2206                      * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients.
2207                      * (Perhaps we should have a separate BUG value for the Kerberos cipher)
2208                      */
2209                     if (!((s->options & SSL_OP_TLS_ROLLBACK_BUG) &&
2210                            (p[0] == (s->version>>8)) && (p[1] == (s->version & 0xff))))
2211                         {
2212                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2213                                SSL_AD_DECODE_ERROR);
2214                         goto err;
2215                         }
2216                     }
2217
2218                 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2219
2220                 s->session->master_key_length=
2221                         s->method->ssl3_enc->generate_master_secret(s,
2222                                 s->session->master_key, pms, outl);
2223
2224                 if (kssl_ctx->client_princ)
2225                         {
2226                         size_t len = strlen(kssl_ctx->client_princ);
2227                         if ( len < SSL_MAX_KRB5_PRINCIPAL_LENGTH )
2228                                 {
2229                                 s->session->krb5_client_princ_len = len;
2230                                 memcpy(s->session->krb5_client_princ,kssl_ctx->client_princ,len);
2231                                 }
2232                         }
2233
2234
2235                 /*  Was doing kssl_ctx_free() here,
2236                 **  but it caused problems for apache.
2237                 **  kssl_ctx = kssl_ctx_free(kssl_ctx);
2238                 **  if (s->kssl_ctx)  s->kssl_ctx = NULL;
2239                 */
2240                 }
2241         else
2242 #endif  /* OPENSSL_NO_KRB5 */
2243
2244 #ifndef OPENSSL_NO_ECDH
2245                 if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2246                 {
2247                 int ret = 1;
2248                 int field_size = 0;
2249                 const EC_KEY   *tkey;
2250                 const EC_GROUP *group;
2251                 const BIGNUM *priv_key;
2252
2253                 /* initialize structures for server's ECDH key pair */
2254                 if ((srvr_ecdh = EC_KEY_new()) == NULL)
2255                         {
2256                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2257                             ERR_R_MALLOC_FAILURE);
2258                         goto err;
2259                         }
2260
2261                 /* Let's get server private key and group information */
2262                 if (alg_k & (SSL_kECDHr|SSL_kECDHe))
2263                         {
2264                         /* use the certificate */
2265                         tkey = s->cert->pkeys[SSL_PKEY_ECC].privatekey->pkey.ec;
2266                         }
2267                 else
2268                         {
2269                         /* use the ephermeral values we saved when
2270                          * generating the ServerKeyExchange msg.
2271                          */
2272                         tkey = s->s3->tmp.ecdh;
2273                         }
2274
2275                 group    = EC_KEY_get0_group(tkey);
2276                 priv_key = EC_KEY_get0_private_key(tkey);
2277
2278                 if (!EC_KEY_set_group(srvr_ecdh, group) ||
2279                     !EC_KEY_set_private_key(srvr_ecdh, priv_key))
2280                         {
2281                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2282                                ERR_R_EC_LIB);
2283                         goto err;
2284                         }
2285
2286                 /* Let's get client's public key */
2287                 if ((clnt_ecpoint = EC_POINT_new(group)) == NULL)
2288                         {
2289                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2290                             ERR_R_MALLOC_FAILURE);
2291                         goto err;
2292                         }
2293
2294                 if (n == 0L)
2295                         {
2296                         /* Client Publickey was in Client Certificate */
2297
2298                          if (alg_k & SSL_kEECDH)
2299                                  {
2300                                  al=SSL_AD_HANDSHAKE_FAILURE;
2301                                  SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
2302                                  goto f_err;
2303                                  }
2304                         if (((clnt_pub_pkey=X509_get_pubkey(s->session->peer))
2305                             == NULL) ||
2306                             (clnt_pub_pkey->type != EVP_PKEY_EC))
2307                                 {
2308                                 /* XXX: For now, we do not support client
2309                                  * authentication using ECDH certificates
2310                                  * so this branch (n == 0L) of the code is
2311                                  * never executed. When that support is
2312                                  * added, we ought to ensure the key
2313                                  * received in the certificate is
2314                                  * authorized for key agreement.
2315                                  * ECDH_compute_key implicitly checks that
2316                                  * the two ECDH shares are for the same
2317                                  * group.
2318                                  */
2319                                 al=SSL_AD_HANDSHAKE_FAILURE;
2320                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2321                                     SSL_R_UNABLE_TO_DECODE_ECDH_CERTS);
2322                                 goto f_err;
2323                                 }
2324
2325                         if (EC_POINT_copy(clnt_ecpoint,
2326                             EC_KEY_get0_public_key(clnt_pub_pkey->pkey.ec)) == 0)
2327                                 {
2328                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2329                                         ERR_R_EC_LIB);
2330                                 goto err;
2331                                 }
2332                         ret = 2; /* Skip certificate verify processing */
2333                         }
2334                 else
2335                         {
2336                         /* Get client's public key from encoded point
2337                          * in the ClientKeyExchange message.
2338                          */
2339                         if ((bn_ctx = BN_CTX_new()) == NULL)
2340                                 {
2341                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2342                                     ERR_R_MALLOC_FAILURE);
2343                                 goto err;
2344                                 }
2345
2346                         /* Get encoded point length */
2347                         i = *p;
2348                         p += 1;
2349                         if (EC_POINT_oct2point(group,
2350                             clnt_ecpoint, p, i, bn_ctx) == 0)
2351                                 {
2352                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2353                                     ERR_R_EC_LIB);
2354                                 goto err;
2355                                 }
2356                         /* p is pointing to somewhere in the buffer
2357                          * currently, so set it to the start
2358                          */
2359                         p=(unsigned char *)s->init_buf->data;
2360                         }
2361
2362                 /* Compute the shared pre-master secret */
2363                 field_size = EC_GROUP_get_degree(group);
2364                 if (field_size <= 0)
2365                         {
2366                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2367                                ERR_R_ECDH_LIB);
2368                         goto err;
2369                         }
2370                 i = ECDH_compute_key(p, (field_size+7)/8, clnt_ecpoint, srvr_ecdh, NULL);
2371                 if (i <= 0)
2372                         {
2373                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2374                             ERR_R_ECDH_LIB);
2375                         goto err;
2376                         }
2377
2378                 EVP_PKEY_free(clnt_pub_pkey);
2379                 EC_POINT_free(clnt_ecpoint);
2380                 if (srvr_ecdh != NULL)
2381                         EC_KEY_free(srvr_ecdh);
2382                 BN_CTX_free(bn_ctx);
2383
2384                 /* Compute the master secret */
2385                 s->session->master_key_length = s->method->ssl3_enc-> \
2386                     generate_master_secret(s, s->session->master_key, p, i);
2387
2388                 OPENSSL_cleanse(p, i);
2389                 return (ret);
2390                 }
2391         else
2392 #endif
2393 #ifndef OPENSSL_NO_PSK
2394                 if (alg_k & SSL_kPSK)
2395                         {
2396                         unsigned char *t = NULL;
2397                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
2398                         unsigned int pre_ms_len = 0, psk_len = 0;
2399                         int psk_err = 1;
2400                         char tmp_id[PSK_MAX_IDENTITY_LEN+1];
2401
2402                         al=SSL_AD_HANDSHAKE_FAILURE;
2403
2404                         n2s(p,i);
2405                         if (n != i+2)
2406                                 {
2407                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2408                                         SSL_R_LENGTH_MISMATCH);
2409                                 goto psk_err;
2410                                 }
2411                         if (i > PSK_MAX_IDENTITY_LEN)
2412                                 {
2413                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2414                                         SSL_R_DATA_LENGTH_TOO_LONG);
2415                                 goto psk_err;
2416                                 }
2417                         if (s->psk_server_callback == NULL)
2418                                 {
2419                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2420                                        SSL_R_PSK_NO_SERVER_CB);
2421                                 goto psk_err;
2422                                 }
2423
2424                         /* Create guaranteed NULL-terminated identity
2425                          * string for the callback */
2426                         memcpy(tmp_id, p, i);
2427                         memset(tmp_id+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
2428                         psk_len = s->psk_server_callback(s, tmp_id,
2429                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
2430                         OPENSSL_cleanse(tmp_id, PSK_MAX_IDENTITY_LEN+1);
2431
2432                         if (psk_len > PSK_MAX_PSK_LEN)
2433                                 {
2434                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2435                                         ERR_R_INTERNAL_ERROR);
2436                                 goto psk_err;
2437                                 }
2438                         else if (psk_len == 0)
2439                                 {
2440                                 /* PSK related to the given identity not found */
2441                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2442                                        SSL_R_PSK_IDENTITY_NOT_FOUND);
2443                                 al=SSL_AD_UNKNOWN_PSK_IDENTITY;
2444                                 goto psk_err;
2445                                 }
2446
2447                         /* create PSK pre_master_secret */
2448                         pre_ms_len=2+psk_len+2+psk_len;
2449                         t = psk_or_pre_ms;
2450                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
2451                         s2n(psk_len, t);
2452                         memset(t, 0, psk_len);
2453                         t+=psk_len;
2454                         s2n(psk_len, t);
2455
2456                         if (s->session->psk_identity != NULL)
2457                                 OPENSSL_free(s->session->psk_identity);
2458                         s->session->psk_identity = BUF_strdup((char *)p);
2459                         if (s->session->psk_identity == NULL)
2460                                 {
2461                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2462                                         ERR_R_MALLOC_FAILURE);
2463                                 goto psk_err;
2464                                 }
2465
2466                         if (s->session->psk_identity_hint != NULL)
2467                                 OPENSSL_free(s->session->psk_identity_hint);
2468                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
2469                         if (s->ctx->psk_identity_hint != NULL &&
2470                                 s->session->psk_identity_hint == NULL)
2471                                 {
2472                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2473                                         ERR_R_MALLOC_FAILURE);
2474                                 goto psk_err;
2475                                 }
2476
2477                         s->session->master_key_length=
2478                                 s->method->ssl3_enc->generate_master_secret(s,
2479                                         s->session->master_key, psk_or_pre_ms, pre_ms_len);
2480                         psk_err = 0;
2481                 psk_err:
2482                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
2483                         if (psk_err != 0)
2484                                 goto f_err;
2485                         }
2486                 else
2487 #endif
2488                 if (alg_k & SSL_kGOST)
2489                 {
2490                         EVP_PKEY_CTX *pkey_ctx;
2491                         unsigned char premaster_secret[32];
2492                         size_t outlen;
2493
2494                         /* Get our certificate privatec key*/
2495                         pkey_ctx = EVP_PKEY_CTX_new(s->cert->key->privatekey,NULL);
2496                         EVP_PKEY_decrypt_init(pkey_ctx);
2497                         /* Decrypt session key */
2498                         if ((*p!=( V_ASN1_SEQUENCE| V_ASN1_CONSTRUCTED)) || p[1]!=0x81 )
2499                                 {
2500                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2501                                 goto err;
2502                                 }
2503                         if (EVP_PKEY_decrypt(pkey_ctx,premaster_secret,&outlen,p+3,p[2]) <0)
2504
2505                                 {
2506                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2507                                 goto err;
2508                                 }
2509                         /* Generate master secret */
2510                         EVP_PKEY_CTX_free(pkey_ctx);
2511                         s->session->master_key_length=
2512                                 s->method->ssl3_enc->generate_master_secret(s,
2513                                         s->session->master_key,premaster_secret,32);
2514
2515                 }
2516                 else
2517                 {
2518                 al=SSL_AD_HANDSHAKE_FAILURE;
2519                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2520                                 SSL_R_UNKNOWN_CIPHER_TYPE);
2521                 goto f_err;
2522                 }
2523
2524         return(1);
2525 f_err:
2526         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2527 #if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA) || !defined(OPENSSL_NO_ECDH)
2528 err:
2529 #endif
2530 #ifndef OPENSSL_NO_ECDH
2531         EVP_PKEY_free(clnt_pub_pkey);
2532         EC_POINT_free(clnt_ecpoint);
2533         if (srvr_ecdh != NULL)
2534                 EC_KEY_free(srvr_ecdh);
2535         BN_CTX_free(bn_ctx);
2536 #endif
2537         return(-1);
2538         }
2539
2540 int ssl3_get_cert_verify(SSL *s)
2541         {
2542         EVP_PKEY *pkey=NULL;
2543         unsigned char *p;
2544         int al,ok,ret=0;
2545         long n;
2546         int type=0,i,j;
2547         X509 *peer;
2548
2549         n=s->method->ssl_get_message(s,
2550                 SSL3_ST_SR_CERT_VRFY_A,
2551                 SSL3_ST_SR_CERT_VRFY_B,
2552                 -1,
2553                 514, /* 514? */
2554                 &ok);
2555
2556         if (!ok) return((int)n);
2557
2558         if (s->session->peer != NULL)
2559                 {
2560                 peer=s->session->peer;
2561                 pkey=X509_get_pubkey(peer);
2562                 type=X509_certificate_type(peer,pkey);
2563                 }
2564         else
2565                 {
2566                 peer=NULL;
2567                 pkey=NULL;
2568                 }
2569
2570         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
2571                 {
2572                 s->s3->tmp.reuse_message=1;
2573                 if ((peer != NULL) && (type | EVP_PKT_SIGN))
2574                         {
2575                         al=SSL_AD_UNEXPECTED_MESSAGE;
2576                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
2577                         goto f_err;
2578                         }
2579                 ret=1;
2580                 goto end;
2581                 }
2582
2583         if (peer == NULL)
2584                 {
2585                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
2586                 al=SSL_AD_UNEXPECTED_MESSAGE;
2587                 goto f_err;
2588                 }
2589
2590         if (!(type & EVP_PKT_SIGN))
2591                 {
2592                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
2593                 al=SSL_AD_ILLEGAL_PARAMETER;
2594                 goto f_err;
2595                 }
2596
2597         if (s->s3->change_cipher_spec)
2598                 {
2599                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
2600                 al=SSL_AD_UNEXPECTED_MESSAGE;
2601                 goto f_err;
2602                 }
2603
2604         /* we now have a signature that we need to verify */
2605         p=(unsigned char *)s->init_msg;
2606         /* Check for broken implementations of GOST ciphersuites */
2607         /* If key is GOST and n is exactly 64, it is bare
2608          * signature without length field */
2609         if (n==64 && (pkey->type==NID_id_GostR3410_94 ||
2610                 pkey->type == NID_id_GostR3410_2001) )
2611                 {
2612                 i=64;
2613                 }
2614         else
2615                 {
2616                 n2s(p,i);
2617                 n-=2;
2618                 if (i > n)
2619                         {
2620                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
2621                         al=SSL_AD_DECODE_ERROR;
2622                         goto f_err;
2623                         }
2624         }
2625         j=EVP_PKEY_size(pkey);
2626         if ((i > j) || (n > j) || (n <= 0))
2627                 {
2628                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
2629                 al=SSL_AD_DECODE_ERROR;
2630                 goto f_err;
2631                 }
2632
2633 #ifndef OPENSSL_NO_RSA
2634         if (pkey->type == EVP_PKEY_RSA)
2635                 {
2636                 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
2637                         MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i,
2638                                                         pkey->pkey.rsa);
2639                 if (i < 0)
2640                         {
2641                         al=SSL_AD_DECRYPT_ERROR;
2642                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
2643                         goto f_err;
2644                         }
2645                 if (i == 0)
2646                         {
2647                         al=SSL_AD_DECRYPT_ERROR;
2648                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
2649                         goto f_err;
2650                         }
2651                 }
2652         else
2653 #endif
2654 #ifndef OPENSSL_NO_DSA
2655                 if (pkey->type == EVP_PKEY_DSA)
2656                 {
2657                 j=DSA_verify(pkey->save_type,
2658                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
2659                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
2660                 if (j <= 0)
2661                         {
2662                         /* bad signature */
2663                         al=SSL_AD_DECRYPT_ERROR;
2664                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
2665                         goto f_err;
2666                         }
2667                 }
2668         else
2669 #endif
2670 #ifndef OPENSSL_NO_ECDSA
2671                 if (pkey->type == EVP_PKEY_EC)
2672                 {
2673                 j=ECDSA_verify(pkey->save_type,
2674                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
2675                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.ec);
2676                 if (j <= 0)
2677                         {
2678                         /* bad signature */
2679                         al=SSL_AD_DECRYPT_ERROR;
2680                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
2681                             SSL_R_BAD_ECDSA_SIGNATURE);
2682                         goto f_err;
2683                         }
2684                 }
2685         else
2686 #endif
2687         if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001)
2688                 {   unsigned char signature[64];
2689                         int idx;
2690                         EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new(pkey,NULL);
2691                         EVP_PKEY_verify_init(pctx);
2692                         if (i!=64) {
2693                                 fprintf(stderr,"GOST signature length is %d",i);
2694                         }
2695                         for (idx=0;idx<64;idx++) {
2696                                 signature[63-idx]=p[idx];
2697                         }
2698                         j=EVP_PKEY_verify(pctx,signature,64,s->s3->tmp.cert_verify_md,32);
2699                         EVP_PKEY_CTX_free(pctx);
2700                         if (j<=0)
2701                                 {
2702                                 al=SSL_AD_DECRYPT_ERROR;
2703                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
2704                                         SSL_R_BAD_ECDSA_SIGNATURE);
2705                                 goto f_err;
2706                                 }
2707                 }
2708         else
2709                 {
2710                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
2711                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
2712                 goto f_err;
2713                 }
2714
2715
2716         ret=1;
2717         if (0)
2718                 {
2719 f_err:
2720                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2721                 }
2722 end:
2723         EVP_PKEY_free(pkey);
2724         return(ret);
2725         }
2726
2727 int ssl3_get_client_certificate(SSL *s)
2728         {
2729         int i,ok,al,ret= -1;
2730         X509 *x=NULL;
2731         unsigned long l,nc,llen,n;
2732         const unsigned char *p,*q;
2733         unsigned char *d;
2734         STACK_OF(X509) *sk=NULL;
2735
2736         n=s->method->ssl_get_message(s,
2737                 SSL3_ST_SR_CERT_A,
2738                 SSL3_ST_SR_CERT_B,
2739                 -1,
2740                 s->max_cert_list,
2741                 &ok);
2742
2743         if (!ok) return((int)n);
2744
2745         if      (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
2746                 {
2747                 if (    (s->verify_mode & SSL_VERIFY_PEER) &&
2748                         (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
2749                         {
2750                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
2751                         al=SSL_AD_HANDSHAKE_FAILURE;
2752                         goto f_err;
2753                         }
2754                 /* If tls asked for a client cert, the client must return a 0 list */
2755                 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
2756                         {
2757                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
2758                         al=SSL_AD_UNEXPECTED_MESSAGE;
2759                         goto f_err;
2760                         }
2761                 s->s3->tmp.reuse_message=1;
2762                 return(1);
2763                 }
2764
2765         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
2766                 {
2767                 al=SSL_AD_UNEXPECTED_MESSAGE;
2768                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
2769                 goto f_err;
2770                 }
2771         p=d=(unsigned char *)s->init_msg;
2772
2773         if ((sk=sk_X509_new_null()) == NULL)
2774                 {
2775                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
2776                 goto err;
2777                 }
2778
2779         n2l3(p,llen);
2780         if (llen+3 != n)
2781                 {
2782                 al=SSL_AD_DECODE_ERROR;
2783                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
2784                 goto f_err;
2785                 }
2786         for (nc=0; nc<llen; )
2787                 {
2788                 n2l3(p,l);
2789                 if ((l+nc+3) > llen)
2790                         {
2791                         al=SSL_AD_DECODE_ERROR;
2792                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
2793                         goto f_err;
2794                         }
2795
2796                 q=p;
2797                 x=d2i_X509(NULL,&p,l);
2798                 if (x == NULL)
2799                         {
2800                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
2801                         goto err;
2802                         }
2803                 if (p != (q+l))
2804                         {
2805                         al=SSL_AD_DECODE_ERROR;
2806                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
2807                         goto f_err;
2808                         }
2809                 if (!sk_X509_push(sk,x))
2810                         {
2811                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
2812                         goto err;
2813                         }
2814                 x=NULL;
2815                 nc+=l+3;
2816                 }
2817
2818         if (sk_X509_num(sk) <= 0)
2819                 {
2820                 /* TLS does not mind 0 certs returned */
2821                 if (s->version == SSL3_VERSION)
2822                         {
2823                         al=SSL_AD_HANDSHAKE_FAILURE;
2824                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
2825                         goto f_err;
2826                         }
2827                 /* Fail for TLS only if we required a certificate */
2828                 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
2829                          (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
2830                         {
2831                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
2832                         al=SSL_AD_HANDSHAKE_FAILURE;
2833                         goto f_err;
2834                         }
2835                 }
2836         else
2837                 {
2838                 i=ssl_verify_cert_chain(s,sk);
2839                 if (!i)
2840                         {
2841                         al=ssl_verify_alarm_type(s->verify_result);
2842                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED);
2843                         goto f_err;
2844                         }
2845                 }
2846
2847         if (s->session->peer != NULL) /* This should not be needed */
2848                 X509_free(s->session->peer);
2849         s->session->peer=sk_X509_shift(sk);
2850         s->session->verify_result = s->verify_result;
2851
2852         /* With the current implementation, sess_cert will always be NULL
2853          * when we arrive here. */
2854         if (s->session->sess_cert == NULL)
2855                 {
2856                 s->session->sess_cert = ssl_sess_cert_new();
2857                 if (s->session->sess_cert == NULL)
2858                         {
2859                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
2860                         goto err;
2861                         }
2862                 }
2863         if (s->session->sess_cert->cert_chain != NULL)
2864                 sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free);
2865         s->session->sess_cert->cert_chain=sk;
2866         /* Inconsistency alert: cert_chain does *not* include the
2867          * peer's own certificate, while we do include it in s3_clnt.c */
2868
2869         sk=NULL;
2870
2871         ret=1;
2872         if (0)
2873                 {
2874 f_err:
2875                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2876                 }
2877 err:
2878         if (x != NULL) X509_free(x);
2879         if (sk != NULL) sk_X509_pop_free(sk,X509_free);
2880         return(ret);
2881         }
2882
2883 int ssl3_send_server_certificate(SSL *s)
2884         {
2885         unsigned long l;
2886         X509 *x;
2887
2888         if (s->state == SSL3_ST_SW_CERT_A)
2889                 {
2890                 x=ssl_get_server_send_cert(s);
2891                 if (x == NULL)
2892                         {
2893                         /* VRS: allow null cert if auth == KRB5 */
2894                         if ((s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5) ||
2895                             (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5))
2896                                 {
2897                                 SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
2898                                 return(0);
2899                                 }
2900                         }
2901
2902                 l=ssl3_output_cert_chain(s,x);
2903                 s->state=SSL3_ST_SW_CERT_B;
2904                 s->init_num=(int)l;
2905                 s->init_off=0;
2906                 }
2907
2908         /* SSL3_ST_SW_CERT_B */
2909         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2910         }
2911 #ifndef OPENSSL_NO_TLSEXT
2912 int ssl3_send_newsession_ticket(SSL *s)
2913         {
2914         if (s->state == SSL3_ST_SW_SESSION_TICKET_A)
2915                 {
2916                 unsigned char *p, *senc, *macstart;
2917                 int len, slen;
2918                 unsigned int hlen;
2919                 EVP_CIPHER_CTX ctx;
2920                 HMAC_CTX hctx;
2921                 unsigned char iv[EVP_MAX_IV_LENGTH];
2922                 unsigned char key_name[16];
2923
2924                 /* get session encoding length */
2925                 slen = i2d_SSL_SESSION(s->session, NULL);
2926                 /* Some length values are 16 bits, so forget it if session is
2927                  * too long
2928                  */
2929                 if (slen > 0xFF00)
2930                         return -1;
2931                 /* Grow buffer if need be: the length calculation is as
2932                  * follows 1 (size of message name) + 3 (message length
2933                  * bytes) + 4 (ticket lifetime hint) + 2 (ticket length) +
2934                  * 16 (key name) + max_iv_len (iv length) +
2935                  * session_length + max_enc_block_size (max encrypted session
2936                  * length) + max_md_size (HMAC).
2937                  */
2938                 if (!BUF_MEM_grow(s->init_buf,
2939                         26 + EVP_MAX_IV_LENGTH + EVP_MAX_BLOCK_LENGTH +
2940                         EVP_MAX_MD_SIZE + slen))
2941                         return -1;
2942                 senc = OPENSSL_malloc(slen);
2943                 if (!senc)
2944                         return -1;
2945                 p = senc;
2946                 i2d_SSL_SESSION(s->session, &p);
2947
2948                 p=(unsigned char *)s->init_buf->data;
2949                 /* do the header */
2950                 *(p++)=SSL3_MT_NEWSESSION_TICKET;
2951                 /* Skip message length for now */
2952                 p += 3;
2953                 EVP_CIPHER_CTX_init(&ctx);
2954                 HMAC_CTX_init(&hctx);
2955                 /* Initialize HMAC and cipher contexts. If callback present
2956                  * it does all the work otherwise use generated values
2957                  * from parent ctx.
2958                  */
2959                 if (s->ctx->tlsext_ticket_key_cb)
2960                         {
2961                         if (s->ctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx,
2962                                                          &hctx, 1) < 0)
2963                                 {
2964                                 OPENSSL_free(senc);
2965                                 return -1;
2966                                 }
2967                         }
2968                 else
2969                         {
2970                         RAND_pseudo_bytes(iv, 16);
2971                         EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
2972                                         s->ctx->tlsext_tick_aes_key, iv);
2973                         HMAC_Init_ex(&hctx, s->ctx->tlsext_tick_hmac_key, 16,
2974                                         tlsext_tick_md(), NULL);
2975                         memcpy(key_name, s->ctx->tlsext_tick_key_name, 16);
2976                         }
2977                 l2n(s->session->tlsext_tick_lifetime_hint, p);
2978                 /* Skip ticket length for now */
2979                 p += 2;
2980                 /* Output key name */
2981                 macstart = p;
2982                 memcpy(p, key_name, 16);
2983                 p += 16;
2984                 /* output IV */
2985                 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
2986                 p += EVP_CIPHER_CTX_iv_length(&ctx);
2987                 /* Encrypt session data */
2988                 EVP_EncryptUpdate(&ctx, p, &len, senc, slen);
2989                 p += len;
2990                 EVP_EncryptFinal(&ctx, p, &len);
2991                 p += len;
2992                 EVP_CIPHER_CTX_cleanup(&ctx);
2993
2994                 HMAC_Update(&hctx, macstart, p - macstart);
2995                 HMAC_Final(&hctx, p, &hlen);
2996                 HMAC_CTX_cleanup(&hctx);
2997
2998                 p += hlen;
2999                 /* Now write out lengths: p points to end of data written */
3000                 /* Total length */
3001                 len = p - (unsigned char *)s->init_buf->data;
3002                 p=(unsigned char *)s->init_buf->data + 1;
3003                 l2n3(len - 4, p); /* Message length */
3004                 p += 4;
3005                 s2n(len - 10, p);  /* Ticket length */
3006
3007                 /* number of bytes to write */
3008                 s->init_num= len;
3009                 s->state=SSL3_ST_SW_SESSION_TICKET_B;
3010                 s->init_off=0;
3011                 OPENSSL_free(senc);
3012                 }
3013
3014         /* SSL3_ST_SW_SESSION_TICKET_B */
3015         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3016         }
3017
3018 int ssl3_send_cert_status(SSL *s)
3019         {
3020         if (s->state == SSL3_ST_SW_CERT_STATUS_A)
3021                 {
3022                 unsigned char *p;
3023                 /* Grow buffer if need be: the length calculation is as
3024                  * follows 1 (message type) + 3 (message length) +
3025                  * 1 (ocsp response type) + 3 (ocsp response length)
3026                  * + (ocsp response)
3027                  */
3028                 if (!BUF_MEM_grow(s->init_buf, 8 + s->tlsext_ocsp_resplen))
3029                         return -1;
3030
3031                 p=(unsigned char *)s->init_buf->data;
3032
3033                 /* do the header */
3034                 *(p++)=SSL3_MT_CERTIFICATE_STATUS;
3035                 /* message length */
3036                 l2n3(s->tlsext_ocsp_resplen + 4, p);
3037                 /* status type */
3038                 *(p++)= s->tlsext_status_type;
3039                 /* length of OCSP response */
3040                 l2n3(s->tlsext_ocsp_resplen, p);
3041                 /* actual response */
3042                 memcpy(p, s->tlsext_ocsp_resp, s->tlsext_ocsp_resplen);
3043                 /* number of bytes to write */
3044                 s->init_num = 8 + s->tlsext_ocsp_resplen;
3045                 s->state=SSL3_ST_SW_CERT_STATUS_B;
3046                 s->init_off = 0;
3047                 }
3048
3049         /* SSL3_ST_SW_CERT_STATUS_B */
3050         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3051         }
3052 #endif