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         int ret= -1;
 193         int new_state,state,skip=0;
 194
 195         RAND_add(&Time,sizeof(Time),0);
 196         ERR_clear_error();
 197         clear_sys_error();
 198
 199         if (s->info_callback != NULL)
 200                 cb=s->info_callback;
 201         else if (s->ctx->info_callback != NULL)
 202                 cb=s->ctx->info_callback;
 203
 204         /* init things to blank */
 205         s->in_handshake++;
 206         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 207
 208         if (s->cert == NULL)
 209                 {
 210                 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
 211                 return(-1);
 212                 }
 213
 214         for (;;)
 215                 {
 216                 state=s->state;
 217
 218                 switch (s->state)
 219                         {
 220                 case SSL_ST_RENEGOTIATE:
 221                         s->new_session=1;
 222                         /* s->state=SSL_ST_ACCEPT; */
 223
 224                 case SSL_ST_BEFORE:
 225                 case SSL_ST_ACCEPT:
 226                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 227                 case SSL_ST_OK|SSL_ST_ACCEPT:
 228
 229                         s->server=1;
 230                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 231
 232                         if ((s->version>>8) != 3)
 233                                 {
 234                                 SSLerr(SSL_F_SSL3_ACCEPT, ERR_R_INTERNAL_ERROR);
 235                                 return -1;
 236                                 }
 237                         s->type=SSL_ST_ACCEPT;
 238
 239                         if (s->init_buf == NULL)
 240                                 {
 241                                 if ((buf=BUF_MEM_new()) == NULL)
 242                                         {
 243                                         ret= -1;
 244                                         goto end;
 245                                         }
 246                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 247                                         {
 248                                         ret= -1;
 249                                         goto end;
 250                                         }
 251                                 s->init_buf=buf;
 252                                 }
 253
 254                         if (!ssl3_setup_buffers(s))
 255                                 {
 256                                 ret= -1;
 257                                 goto end;
 258                                 }
 259
 260                         s->init_num=0;
 261
 262                         if (s->state != SSL_ST_RENEGOTIATE)
 263                                 {
 264                                 /* Ok, we now need to push on a buffering BIO so that
 265                                  * the output is sent in a way that TCP likes :-)
 266                                  */
 267                                 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
 268
 269                                 ssl3_init_finished_mac(s);
 270                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
 271                                 s->ctx->stats.sess_accept++;
 272                                 }
 273                         else if (!s->s3->send_connection_binding &&
 274                                 !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
 275                                 {
 276                                 /* Server attempting to renegotiate with
 277                                  * client that doesn't support secure
 278                                  * renegotiation.
 279                                  */
 280                                 SSLerr(SSL_F_SSL3_ACCEPT, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
 281                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
 282                                 ret = -1;
 283                                 goto end;
 284                                 }
 285                         else
 286                                 {
 287                                 /* s->state == SSL_ST_RENEGOTIATE,
 288                                  * we will just send a HelloRequest */
 289                                 s->ctx->stats.sess_accept_renegotiate++;
 290                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
 291                                 }
 292                         break;
 293
 294                 case SSL3_ST_SW_HELLO_REQ_A:
 295                 case SSL3_ST_SW_HELLO_REQ_B:
 296
 297                         s->shutdown=0;
 298                         ret=ssl3_send_hello_request(s);
 299                         if (ret <= 0) goto end;
 300                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
 301                         s->state=SSL3_ST_SW_FLUSH;
 302                         s->init_num=0;
 303
 304                         ssl3_init_finished_mac(s);
 305                         break;
 306
 307                 case SSL3_ST_SW_HELLO_REQ_C:
 308                         s->state=SSL_ST_OK;
 309                         break;
 310
 311                 case SSL3_ST_SR_CLNT_HELLO_A:
 312                 case SSL3_ST_SR_CLNT_HELLO_B:
 313                 case SSL3_ST_SR_CLNT_HELLO_C:
 314
 315                         s->shutdown=0;
 316                         ret=ssl3_get_client_hello(s);
 317                         if (ret <= 0) goto end;
 318
 319                         s->new_session = 2;
 320                         s->state=SSL3_ST_SW_SRVR_HELLO_A;
 321                         s->init_num=0;
 322                         break;
 323
 324                 case SSL3_ST_SW_SRVR_HELLO_A:
 325                 case SSL3_ST_SW_SRVR_HELLO_B:
 326                         ret=ssl3_send_server_hello(s);
 327                         if (ret <= 0) goto end;
 328 #ifndef OPENSSL_NO_TLSEXT
 329                         if (s->hit)
 330                                 {
 331                                 if (s->tlsext_ticket_expected)
 332                                         s->state=SSL3_ST_SW_SESSION_TICKET_A;
 333                                 else
 334                                         s->state=SSL3_ST_SW_CHANGE_A;
 335                                 }
 336 #else
 337                         if (s->hit)
 338                                         s->state=SSL3_ST_SW_CHANGE_A;
 339 #endif
 340                         else
 341                                 s->state=SSL3_ST_SW_CERT_A;
 342                         s->init_num=0;
 343                         break;
 344
 345                 case SSL3_ST_SW_CERT_A:
 346                 case SSL3_ST_SW_CERT_B:
 347                         /* Check if it is anon DH or anon ECDH, */
 348                         /* normal PSK or KRB5 */
 349                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
 350                                 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)
 351                                 && !(s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
 352                                 {
 353                                 ret=ssl3_send_server_certificate(s);
 354                                 if (ret <= 0) goto end;
 355 #ifndef OPENSSL_NO_TLSEXT
 356                                 if (s->tlsext_status_expected)
 357                                         s->state=SSL3_ST_SW_CERT_STATUS_A;
 358                                 else
 359                                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 360                                 }
 361                         else
 362                                 {
 363                                 skip = 1;
 364                                 s->state=SSL3_ST_SW_KEY_EXCH_A;
 365                                 }
 366 #else
 367                                 }
 368                         else
 369                                 skip=1;
 370
 371                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 372 #endif
 373                         s->init_num=0;
 374                         break;
 375
 376                 case SSL3_ST_SW_KEY_EXCH_A:
 377                 case SSL3_ST_SW_KEY_EXCH_B:
 378                         alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
 379
 380                         /* clear this, it may get reset by
 381                          * send_server_key_exchange */
 382                         if ((s->options & SSL_OP_EPHEMERAL_RSA)
 383 #ifndef OPENSSL_NO_KRB5
 384                                 && !(alg_k & SSL_kKRB5)
 385 #endif /* OPENSSL_NO_KRB5 */
 386                                 )
 387                                 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
 388                                  * even when forbidden by protocol specs
 389                                  * (handshake may fail as clients are not required to
 390                                  * be able to handle this) */
 391                                 s->s3->tmp.use_rsa_tmp=1;
 392                         else
 393                                 s->s3->tmp.use_rsa_tmp=0;
 394
 395
 396                         /* only send if a DH key exchange, fortezza or
 397                          * RSA but we have a sign only certificate
 398                          *
 399                          * PSK: may send PSK identity hints
 400                          *
 401                          * For ECC ciphersuites, we send a serverKeyExchange
 402                          * message only if the cipher suite is either
 403                          * ECDH-anon or ECDHE. In other cases, the
 404                          * server certificate contains the server's
 405                          * public key for key exchange.
 406                          */
 407                         if (s->s3->tmp.use_rsa_tmp
 408                         /* PSK: send ServerKeyExchange if PSK identity
 409                          * hint if provided */
 410 #ifndef OPENSSL_NO_PSK
 411                             || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
 412 #endif
 413                             || (alg_k & (SSL_kDHr|SSL_kDHd|SSL_kEDH))
 414                             || (alg_k & SSL_kEECDH)
 415                             || ((alg_k & SSL_kRSA)
 416                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
 417                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
 418                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
 419                                         )
 420                                     )
 421                                 )
 422                             )
 423                                 {
 424                                 ret=ssl3_send_server_key_exchange(s);
 425                                 if (ret <= 0) goto end;
 426                                 }
 427                         else
 428                                 skip=1;
 429
 430                         s->state=SSL3_ST_SW_CERT_REQ_A;
 431                         s->init_num=0;
 432                         break;
 433
 434                 case SSL3_ST_SW_CERT_REQ_A:
 435                 case SSL3_ST_SW_CERT_REQ_B:
 436                         if (/* don't request cert unless asked for it: */
 437                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
 438                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
 439                                  * don't request cert during re-negotiation: */
 440                                 ((s->session->peer != NULL) &&
 441                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
 442                                 /* never request cert in anonymous ciphersuites
 443                                  * (see section "Certificate request" in SSL 3 drafts
 444                                  * and in RFC 2246): */
 445                                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
 446                                  /* ... except when the application insists on verification
 447                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
 448                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
 449                                  /* never request cert in Kerberos ciphersuites */
 450                                 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5)
 451                                 /* With normal PSK Certificates and
 452                                  * Certificate Requests are omitted */
 453                                 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 454                                 {
 455                                 /* no cert request */
 456                                 skip=1;
 457                                 s->s3->tmp.cert_request=0;
 458                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 459                                 }
 460                         else
 461                                 {
 462                                 s->s3->tmp.cert_request=1;
 463                                 ret=ssl3_send_certificate_request(s);
 464                                 if (ret <= 0) goto end;
 465 #ifndef NETSCAPE_HANG_BUG
 466                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 467 #else
 468                                 s->state=SSL3_ST_SW_FLUSH;
 469                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 470 #endif
 471                                 s->init_num=0;
 472                                 }
 473                         break;
 474
 475                 case SSL3_ST_SW_SRVR_DONE_A:
 476                 case SSL3_ST_SW_SRVR_DONE_B:
 477                         ret=ssl3_send_server_done(s);
 478                         if (ret <= 0) goto end;
 479                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 480                         s->state=SSL3_ST_SW_FLUSH;
 481                         s->init_num=0;
 482                         break;
 483
 484                 case SSL3_ST_SW_FLUSH:
 485
 486                         /* This code originally checked to see if
 487                          * any data was pending using BIO_CTRL_INFO
 488                          * and then flushed. This caused problems
 489                          * as documented in PR#1939. The proposed
 490                          * fix doesn't completely resolve this issue
 491                          * as buggy implementations of BIO_CTRL_PENDING
 492                          * still exist. So instead we just flush
 493                          * unconditionally.
 494                          */
 495
 496                         s->rwstate=SSL_WRITING;
 497                         if (BIO_flush(s->wbio) <= 0)
 498                                 {
 499                                 ret= -1;
 500                                 goto end;
 501                                 }
 502                         s->rwstate=SSL_NOTHING;
 503
 504                         s->state=s->s3->tmp.next_state;
 505                         break;
 506
 507                 case SSL3_ST_SR_CERT_A:
 508                 case SSL3_ST_SR_CERT_B:
 509                         /* Check for second client hello (MS SGC) */
 510                         ret = ssl3_check_client_hello(s);
 511                         if (ret <= 0)
 512                                 goto end;
 513                         if (ret == 2)
 514                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
 515                         else {
 516                                 if (s->s3->tmp.cert_request)
 517                                         {
 518                                         ret=ssl3_get_client_certificate(s);
 519                                         if (ret <= 0) goto end;
 520                                         }
 521                                 s->init_num=0;
 522                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
 523                         }
 524                         break;
 525
 526                 case SSL3_ST_SR_KEY_EXCH_A:
 527                 case SSL3_ST_SR_KEY_EXCH_B:
 528                         ret=ssl3_get_client_key_exchange(s);
 529                         if (ret <= 0)
 530                                 goto end;
 531                         if (ret == 2)
 532                                 {
 533                                 /* For the ECDH ciphersuites when
 534                                  * the client sends its ECDH pub key in
 535                                  * a certificate, the CertificateVerify
 536                                  * message is not sent.
 537                                  * Also for GOST ciphersuites when
 538                                  * the client uses its key from the certificate
 539                                  * for key exchange.
 540                                  */
 541                                 s->state=SSL3_ST_SR_FINISHED_A;
 542                                 s->init_num = 0;
 543                                 }
 544                         else
 545                                 {
 546                                 int offset=0;
 547                                 int dgst_num;
 548
 549                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
 550                                 s->init_num=0;
 551
 552                                 /* We need to get hashes here so if there is
 553                                  * a client cert, it can be verified
 554                                  * FIXME - digest processing for CertificateVerify
 555                                  * should be generalized. But it is next step
 556                                  */
 557                                 if (s->s3->handshake_buffer)
 558                                         if (!ssl3_digest_cached_records(s))
 559                                                 return -1;
 560                                 for (dgst_num=0; dgst_num<SSL_MAX_DIGEST;dgst_num++)
 561                                         if (s->s3->handshake_dgst[dgst_num])
 562                                                 {
 563                                                 int dgst_size;
 564
 565                                                 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]));
 566                                                 dgst_size=EVP_MD_CTX_size(s->s3->handshake_dgst[dgst_num]);
 567                                                 if (dgst_size < 0)
 568                                                         {
 569                                                         ret = -1;
 570                                                         goto end;
 571                                                         }
 572                                                 offset+=dgst_size;
 573                                                 }
 574                                 }
 575                         break;
 576
 577                 case SSL3_ST_SR_CERT_VRFY_A:
 578                 case SSL3_ST_SR_CERT_VRFY_B:
 579
 580                         /* we should decide if we expected this one */
 581                         ret=ssl3_get_cert_verify(s);
 582                         if (ret <= 0) goto end;
 583
 584                         s->state=SSL3_ST_SR_FINISHED_A;
 585                         s->init_num=0;
 586                         break;
 587
 588                 case SSL3_ST_SR_FINISHED_A:
 589                 case SSL3_ST_SR_FINISHED_B:
 590                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
 591                                 SSL3_ST_SR_FINISHED_B);
 592                         if (ret <= 0) goto end;
 593 #ifndef OPENSSL_NO_TLSEXT
 594                         if (s->tlsext_ticket_expected)
 595                                 s->state=SSL3_ST_SW_SESSION_TICKET_A;
 596                         else if (s->hit)
 597                                 s->state=SSL_ST_OK;
 598 #else
 599                         if (s->hit)
 600                                 s->state=SSL_ST_OK;
 601 #endif
 602                         else
 603                                 s->state=SSL3_ST_SW_CHANGE_A;
 604                         s->init_num=0;
 605                         break;
 606
 607 #ifndef OPENSSL_NO_TLSEXT
 608                 case SSL3_ST_SW_SESSION_TICKET_A:
 609                 case SSL3_ST_SW_SESSION_TICKET_B:
 610                         ret=ssl3_send_newsession_ticket(s);
 611                         if (ret <= 0) goto end;
 612                         s->state=SSL3_ST_SW_CHANGE_A;
 613                         s->init_num=0;
 614                         break;
 615
 616                 case SSL3_ST_SW_CERT_STATUS_A:
 617                 case SSL3_ST_SW_CERT_STATUS_B:
 618                         ret=ssl3_send_cert_status(s);
 619                         if (ret <= 0) goto end;
 620                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 621                         s->init_num=0;
 622                         break;
 623
 624 #endif
 625
 626                 case SSL3_ST_SW_CHANGE_A:
 627                 case SSL3_ST_SW_CHANGE_B:
 628
 629                         s->session->cipher=s->s3->tmp.new_cipher;
 630                         if (!s->method->ssl3_enc->setup_key_block(s))
 631                                 { ret= -1; goto end; }
 632
 633                         ret=ssl3_send_change_cipher_spec(s,
 634                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
 635
 636                         if (ret <= 0) goto end;
 637                         s->state=SSL3_ST_SW_FINISHED_A;
 638                         s->init_num=0;
 639
 640                         if (!s->method->ssl3_enc->change_cipher_state(s,
 641                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
 642                                 {
 643                                 ret= -1;
 644                                 goto end;
 645                                 }
 646
 647                         break;
 648
 649                 case SSL3_ST_SW_FINISHED_A:
 650                 case SSL3_ST_SW_FINISHED_B:
 651                         ret=ssl3_send_finished(s,
 652                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
 653                                 s->method->ssl3_enc->server_finished_label,
 654                                 s->method->ssl3_enc->server_finished_label_len);
 655                         if (ret <= 0) goto end;
 656                         s->state=SSL3_ST_SW_FLUSH;
 657                         if (s->hit)
 658                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 659                         else
 660                                 s->s3->tmp.next_state=SSL_ST_OK;
 661                         s->init_num=0;
 662                         break;
 663
 664                 case SSL_ST_OK:
 665                         /* clean a few things up */
 666                         ssl3_cleanup_key_block(s);
 667
 668                         BUF_MEM_free(s->init_buf);
 669                         s->init_buf=NULL;
 670
 671                         /* remove buffering on output */
 672                         ssl_free_wbio_buffer(s);
 673
 674                         s->init_num=0;
 675
 676                         if (s->new_session == 2) /* skipped if we just sent a HelloRequest */
 677                                 {
 678                                 /* actually not necessarily a 'new' session unless
 679                                  * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */
 680
 681                                 s->new_session=0;
 682
 683                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 684
 685                                 s->ctx->stats.sess_accept_good++;
 686                                 /* s->server=1; */
 687                                 s->handshake_func=ssl3_accept;
 688
 689                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 690                                 }
 691
 692                         ret = 1;
 693                         goto end;
 694                         /* break; */
 695
 696                 default:
 697                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
 698                         ret= -1;
 699                         goto end;
 700                         /* break; */
 701                         }
 702
 703                 if (!s->s3->tmp.reuse_message && !skip)
 704                         {
 705                         if (s->debug)
 706                                 {
 707                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 708                                         goto end;
 709                                 }
 710
 711
 712                         if ((cb != NULL) && (s->state != state))
 713                                 {
 714                                 new_state=s->state;
 715                                 s->state=state;
 716                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
 717                                 s->state=new_state;
 718                                 }
 719                         }
 720                 skip=0;
 721                 }
 722 end:
 723         /* BIO_flush(s->wbio); */
 724
 725         s->in_handshake--;
 726         if (cb != NULL)
 727                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 728         return(ret);
 729         }
 730
 731 int ssl3_send_hello_request(SSL *s)
 732         {
 733         unsigned char *p;
 734
 735         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
 736                 {
 737                 p=(unsigned char *)s->init_buf->data;
 738                 *(p++)=SSL3_MT_HELLO_REQUEST;
 739                 *(p++)=0;
 740                 *(p++)=0;
 741                 *(p++)=0;
 742
 743                 s->state=SSL3_ST_SW_HELLO_REQ_B;
 744                 /* number of bytes to write */
 745                 s->init_num=4;
 746                 s->init_off=0;
 747                 }
 748
 749         /* SSL3_ST_SW_HELLO_REQ_B */
 750         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 751         }
 752
 753 int ssl3_check_client_hello(SSL *s)
 754         {
 755         int ok;
 756         long n;
 757
 758         /* this function is called when we really expect a Certificate message,
 759          * so permit appropriate message length */
 760         n=s->method->ssl_get_message(s,
 761                 SSL3_ST_SR_CERT_A,
 762                 SSL3_ST_SR_CERT_B,
 763                 -1,
 764                 s->max_cert_list,
 765                 &ok);
 766         if (!ok) return((int)n);
 767         s->s3->tmp.reuse_message = 1;
 768         if (s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO)
 769                 {
 770                 /* Throw away what we have done so far in the current handshake,
 771                  * which will now be aborted. (A full SSL_clear would be too much.)
 772                  * I hope that tmp.dh is the only thing that may need to be cleared
 773                  * when a handshake is not completed ... */
 774 #ifndef OPENSSL_NO_DH
 775                 if (s->s3->tmp.dh != NULL)
 776                         {
 777                         DH_free(s->s3->tmp.dh);
 778                         s->s3->tmp.dh = NULL;
 779                         }
 780 #endif
 781                 return 2;
 782                 }
 783         return 1;
 784 }
 785
 786 int ssl3_get_client_hello(SSL *s)
 787         {
 788         int i,j,ok,al,ret= -1;
 789         unsigned int cookie_len;
 790         long n;
 791         unsigned long id;
 792         unsigned char *p,*d,*q;
 793         SSL_CIPHER *c;
 794 #ifndef OPENSSL_NO_COMP
 795         SSL_COMP *comp=NULL;
 796 #endif
 797         STACK_OF(SSL_CIPHER) *ciphers=NULL;
 798
 799         /* We do this so that we will respond with our native type.
 800          * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
 801          * This down switching should be handled by a different method.
 802          * If we are SSLv3, we will respond with SSLv3, even if prompted with
 803          * TLSv1.
 804          */
 805         if (s->state == SSL3_ST_SR_CLNT_HELLO_A)
 806                 {
 807                 s->state=SSL3_ST_SR_CLNT_HELLO_B;
 808                 }
 809         s->first_packet=1;
 810         n=s->method->ssl_get_message(s,
 811                 SSL3_ST_SR_CLNT_HELLO_B,
 812                 SSL3_ST_SR_CLNT_HELLO_C,
 813                 SSL3_MT_CLIENT_HELLO,
 814                 SSL3_RT_MAX_PLAIN_LENGTH,
 815                 &ok);
 816
 817         if (!ok) return((int)n);
 818         s->first_packet=0;
 819         d=p=(unsigned char *)s->init_msg;
 820
 821         /* use version from inside client hello, not from record header
 822          * (may differ: see RFC 2246, Appendix E, second paragraph) */
 823         s->client_version=(((int)p[0])<<8)|(int)p[1];
 824         p+=2;
 825
 826         if ((s->version == DTLS1_VERSION && s->client_version > s->version) ||
 827             (s->version != DTLS1_VERSION && s->client_version < s->version))
 828                 {
 829                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER);
 830                 if ((s->client_version>>8) == SSL3_VERSION_MAJOR)
 831                         {
 832                         /* similar to ssl3_get_record, send alert using remote version number */
 833                         s->version = s->client_version;
 834                         }
 835                 al = SSL_AD_PROTOCOL_VERSION;
 836                 goto f_err;
 837                 }
 838
 839         /* If we require cookies and this ClientHello doesn't
 840          * contain one, just return since we do not want to
 841          * allocate any memory yet. So check cookie length...
 842          */
 843         if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)
 844                 {
 845                 unsigned int session_length, cookie_length;
 846
 847                 session_length = *(p + SSL3_RANDOM_SIZE);
 848                 cookie_length = *(p + SSL3_RANDOM_SIZE + session_length + 1);
 849
 850                 if (cookie_length == 0)
 851                         return 1;
 852                 }
 853
 854         /* load the client random */
 855         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
 856         p+=SSL3_RANDOM_SIZE;
 857
 858         /* get the session-id */
 859         j= *(p++);
 860
 861         s->hit=0;
 862         /* Versions before 0.9.7 always allow session reuse during renegotiation
 863          * (i.e. when s->new_session is true), option
 864          * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is new with 0.9.7.
 865          * Maybe this optional behaviour should always have been the default,
 866          * but we cannot safely change the default behaviour (or new applications
 867          * might be written that become totally unsecure when compiled with
 868          * an earlier library version)
 869          */
 870         if ((s->new_session && (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION)))
 871                 {
 872                 if (!ssl_get_new_session(s,1))
 873                         goto err;
 874                 }
 875         else
 876                 {
 877                 i=ssl_get_prev_session(s, p, j, d + n);
 878                 if (i == 1)
 879                         { /* previous session */
 880                         s->hit=1;
 881                         }
 882                 else if (i == -1)
 883                         goto err;
 884                 else /* i == 0 */
 885                         {
 886                         if (!ssl_get_new_session(s,1))
 887                                 goto err;
 888                         }
 889                 }
 890
 891         p+=j;
 892
 893         if (s->version == DTLS1_VERSION || s->version == DTLS1_BAD_VER)
 894                 {
 895                 /* cookie stuff */
 896                 cookie_len = *(p++);
 897
 898                 /*
 899                  * The ClientHello may contain a cookie even if the
 900                  * HelloVerify message has not been sent--make sure that it
 901                  * does not cause an overflow.
 902                  */
 903                 if ( cookie_len > sizeof(s->d1->rcvd_cookie))
 904                         {
 905                         /* too much data */
 906                         al = SSL_AD_DECODE_ERROR;
 907                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
 908                         goto f_err;
 909                         }
 910
 911                 /* verify the cookie if appropriate option is set. */
 912                 if ((SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) &&
 913                         cookie_len > 0)
 914                         {
 915                         memcpy(s->d1->rcvd_cookie, p, cookie_len);
 916
 917                         if ( s->ctx->app_verify_cookie_cb != NULL)
 918                                 {
 919                                 if ( s->ctx->app_verify_cookie_cb(s, s->d1->rcvd_cookie,
 920                                         cookie_len) == 0)
 921                                         {
 922                                         al=SSL_AD_HANDSHAKE_FAILURE;
 923                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
 924                                                 SSL_R_COOKIE_MISMATCH);
 925                                         goto f_err;
 926                                         }
 927                                 /* else cookie verification succeeded */
 928                                 }
 929                         else if ( memcmp(s->d1->rcvd_cookie, s->d1->cookie,
 930                                                   s->d1->cookie_len) != 0) /* default verification */
 931                                 {
 932                                         al=SSL_AD_HANDSHAKE_FAILURE;
 933                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
 934                                                 SSL_R_COOKIE_MISMATCH);
 935                                         goto f_err;
 936                                 }
 937
 938                         ret = 2;
 939                         }
 940
 941                 p += cookie_len;
 942                 }
 943
 944         n2s(p,i);
 945         if ((i == 0) && (j != 0))
 946                 {
 947                 /* we need a cipher if we are not resuming a session */
 948                 al=SSL_AD_ILLEGAL_PARAMETER;
 949                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
 950                 goto f_err;
 951                 }
 952         if ((p+i) >= (d+n))
 953                 {
 954                 /* not enough data */
 955                 al=SSL_AD_DECODE_ERROR;
 956                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 957                 goto f_err;
 958                 }
 959         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
 960                 == NULL))
 961                 {
 962                 goto err;
 963                 }
 964         p+=i;
 965
 966         /* If it is a hit, check that the cipher is in the list */
 967         if ((s->hit) && (i > 0))
 968                 {
 969                 j=0;
 970                 id=s->session->cipher->id;
 971
 972 #ifdef CIPHER_DEBUG
 973                 printf("client sent %d ciphers\n",sk_num(ciphers));
 974 #endif
 975                 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
 976                         {
 977                         c=sk_SSL_CIPHER_value(ciphers,i);
 978 #ifdef CIPHER_DEBUG
 979                         printf("client [%2d of %2d]:%s\n",
 980                                 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
 981 #endif
 982                         if (c->id == id)
 983                                 {
 984                                 j=1;
 985                                 break;
 986                                 }
 987                         }
 988                 if (j == 0 && (s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
 989                         {
 990                         /* Special case as client bug workaround: the previously used cipher may
 991                          * not be in the current list, the client instead might be trying to
 992                          * continue using a cipher that before wasn't chosen due to server
 993                          * preferences.  We'll have to reject the connection if the cipher is not
 994                          * enabled, though. */
 995                         c = sk_SSL_CIPHER_value(ciphers, 0);
 996                         if (sk_SSL_CIPHER_find(SSL_get_ciphers(s), c) >= 0)
 997                                 {
 998                                 s->session->cipher = c;
 999                                 j = 1;
1000                                 }
1001                         }
1002                 if (j == 0)
1003                         {
1004                         /* we need to have the cipher in the cipher
1005                          * list if we are asked to reuse it */
1006                         al=SSL_AD_ILLEGAL_PARAMETER;
1007                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
1008                         goto f_err;
1009                         }
1010                 }
1011
1012         /* compression */
1013         i= *(p++);
1014         if ((p+i) > (d+n))
1015                 {
1016                 /* not enough data */
1017                 al=SSL_AD_DECODE_ERROR;
1018                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
1019                 goto f_err;
1020                 }
1021         q=p;
1022         for (j=0; j<i; j++)
1023                 {
1024                 if (p[j] == 0) break;
1025                 }
1026
1027         p+=i;
1028         if (j >= i)
1029                 {
1030                 /* no compress */
1031                 al=SSL_AD_DECODE_ERROR;
1032                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
1033                 goto f_err;
1034                 }
1035
1036 #ifndef OPENSSL_NO_TLSEXT
1037         /* TLS extensions*/
1038         if (s->version >= SSL3_VERSION)
1039                 {
1040                 if (!ssl_parse_clienthello_tlsext(s,&p,d,n, &al))
1041                         {
1042                         /* 'al' set by ssl_parse_clienthello_tlsext */
1043                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_PARSE_TLSEXT);
1044                         goto f_err;
1045                         }
1046                 }
1047                 if (ssl_check_clienthello_tlsext(s) <= 0) {
1048                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
1049                         goto err;
1050                 }
1051
1052         /* Check if we want to use external pre-shared secret for this
1053          * handshake for not reused session only. We need to generate
1054          * server_random before calling tls_session_secret_cb in order to allow
1055          * SessionTicket processing to use it in key derivation. */
1056         {
1057                 unsigned long Time;
1058                 unsigned char *pos;
1059                 Time=(unsigned long)time(NULL);                 /* Time */
1060                 pos=s->s3->server_random;
1061                 l2n(Time,pos);
1062                 if (RAND_pseudo_bytes(pos,SSL3_RANDOM_SIZE-4) <= 0)
1063                         {
1064                         al=SSL_AD_INTERNAL_ERROR;
1065                         goto f_err;
1066                         }
1067         }
1068
1069         if (!s->hit && s->version >= TLS1_VERSION && s->tls_session_secret_cb)
1070                 {
1071                 SSL_CIPHER *pref_cipher=NULL;
1072
1073                 s->session->master_key_length=sizeof(s->session->master_key);
1074                 if(s->tls_session_secret_cb(s, s->session->master_key, &s->session->master_key_length,
1075                         ciphers, &pref_cipher, s->tls_session_secret_cb_arg))
1076                         {
1077                         s->hit=1;
1078                         s->session->ciphers=ciphers;
1079                         s->session->verify_result=X509_V_OK;
1080
1081                         ciphers=NULL;
1082
1083                         /* check if some cipher was preferred by call back */
1084                         pref_cipher=pref_cipher ? pref_cipher : ssl3_choose_cipher(s, s->session->ciphers, SSL_get_ciphers(s));
1085                         if (pref_cipher == NULL)
1086                                 {
1087                                 al=SSL_AD_HANDSHAKE_FAILURE;
1088                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1089                                 goto f_err;
1090                                 }
1091
1092                         s->session->cipher=pref_cipher;
1093
1094                         if (s->cipher_list)
1095                                 sk_SSL_CIPHER_free(s->cipher_list);
1096
1097                         if (s->cipher_list_by_id)
1098                                 sk_SSL_CIPHER_free(s->cipher_list_by_id);
1099
1100                         s->cipher_list = sk_SSL_CIPHER_dup(s->session->ciphers);
1101                         s->cipher_list_by_id = sk_SSL_CIPHER_dup(s->session->ciphers);
1102                         }
1103                 }
1104 #endif
1105
1106         /* Worst case, we will use the NULL compression, but if we have other
1107          * options, we will now look for them.  We have i-1 compression
1108          * algorithms from the client, starting at q. */
1109         s->s3->tmp.new_compression=NULL;
1110 #ifndef OPENSSL_NO_COMP
1111         /* This only happens if we have a cache hit */
1112         if (s->session->compress_meth != 0)
1113                 {
1114                 int m, comp_id = s->session->compress_meth;
1115                 /* Perform sanity checks on resumed compression algorithm */
1116                 /* Can't disable compression */
1117                 if (s->options & SSL_OP_NO_COMPRESSION)
1118                         {
1119                         al=SSL_AD_INTERNAL_ERROR;
1120                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1121                         goto f_err;
1122                         }
1123                 /* Look for resumed compression method */
1124                 for (m = 0; m < sk_SSL_COMP_num(s->ctx->comp_methods); m++)
1125                         {
1126                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1127                         if (comp_id == comp->id)
1128                                 {
1129                                 s->s3->tmp.new_compression=comp;
1130                                 break;
1131                                 }
1132                         }
1133                 if (s->s3->tmp.new_compression == NULL)
1134                         {
1135                         al=SSL_AD_INTERNAL_ERROR;
1136                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INVALID_COMPRESSION_ALGORITHM);
1137                         goto f_err;
1138                         }
1139                 /* Look for resumed method in compression list */
1140                 for (m = 0; m < i; m++)
1141                         {
1142                         if (q[m] == comp_id)
1143                                 break;
1144                         }
1145                 if (m >= i)
1146                         {
1147                         al=SSL_AD_ILLEGAL_PARAMETER;
1148                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_COMPRESSSION_ALGORITHM_MISSING);
1149                         goto f_err;
1150                         }
1151                 }
1152         else if (s->hit)
1153                 comp = NULL;
1154         else if (!(s->options & SSL_OP_NO_COMPRESSION) && s->ctx->comp_methods)
1155                 { /* See if we have a match */
1156                 int m,nn,o,v,done=0;
1157
1158                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
1159                 for (m=0; m<nn; m++)
1160                         {
1161                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1162                         v=comp->id;
1163                         for (o=0; o<i; o++)
1164                                 {
1165                                 if (v == q[o])
1166                                         {
1167                                         done=1;
1168                                         break;
1169                                         }
1170                                 }
1171                         if (done) break;
1172                         }
1173                 if (done)
1174                         s->s3->tmp.new_compression=comp;
1175                 else
1176                         comp=NULL;
1177                 }
1178 #else
1179         /* If compression is disabled we'd better not try to resume a session
1180          * using compression.
1181          */
1182         if (s->session->compress_meth != 0)
1183                 {
1184                 al=SSL_AD_INTERNAL_ERROR;
1185                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1186                 goto f_err;
1187                 }
1188 #endif
1189
1190         /* Given s->session->ciphers and SSL_get_ciphers, we must
1191          * pick a cipher */
1192
1193         if (!s->hit)
1194                 {
1195 #ifdef OPENSSL_NO_COMP
1196                 s->session->compress_meth=0;
1197 #else
1198                 s->session->compress_meth=(comp == NULL)?0:comp->id;
1199 #endif
1200                 if (s->session->ciphers != NULL)
1201                         sk_SSL_CIPHER_free(s->session->ciphers);
1202                 s->session->ciphers=ciphers;
1203                 if (ciphers == NULL)
1204                         {
1205                         al=SSL_AD_ILLEGAL_PARAMETER;
1206                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
1207                         goto f_err;
1208                         }
1209                 ciphers=NULL;
1210                 c=ssl3_choose_cipher(s,s->session->ciphers,
1211                                      SSL_get_ciphers(s));
1212
1213                 if (c == NULL)
1214                         {
1215                         al=SSL_AD_HANDSHAKE_FAILURE;
1216                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1217                         goto f_err;
1218                         }
1219                 s->s3->tmp.new_cipher=c;
1220                 }
1221         else
1222                 {
1223                 /* Session-id reuse */
1224 #ifdef REUSE_CIPHER_BUG
1225                 STACK_OF(SSL_CIPHER) *sk;
1226                 SSL_CIPHER *nc=NULL;
1227                 SSL_CIPHER *ec=NULL;
1228
1229                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
1230                         {
1231                         sk=s->session->ciphers;
1232                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
1233                                 {
1234                                 c=sk_SSL_CIPHER_value(sk,i);
1235                                 if (c->algorithm_enc & SSL_eNULL)
1236                                         nc=c;
1237                                 if (SSL_C_IS_EXPORT(c))
1238                                         ec=c;
1239                                 }
1240                         if (nc != NULL)
1241                                 s->s3->tmp.new_cipher=nc;
1242                         else if (ec != NULL)
1243                                 s->s3->tmp.new_cipher=ec;
1244                         else
1245                                 s->s3->tmp.new_cipher=s->session->cipher;
1246                         }
1247                 else
1248 #endif
1249                 s->s3->tmp.new_cipher=s->session->cipher;
1250                 }
1251
1252         if (!ssl3_digest_cached_records(s))
1253                 goto f_err;
1254
1255         /* we now have the following setup.
1256          * client_random
1257          * cipher_list          - our prefered list of ciphers
1258          * ciphers              - the clients prefered list of ciphers
1259          * compression          - basically ignored right now
1260          * ssl version is set   - sslv3
1261          * s->session           - The ssl session has been setup.
1262          * s->hit               - session reuse flag
1263          * s->tmp.new_cipher    - the new cipher to use.
1264          */
1265
1266         if (ret < 0) ret=1;
1267         if (0)
1268                 {
1269 f_err:
1270                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1271                 }
1272 err:
1273         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
1274         return(ret);
1275         }
1276
1277 int ssl3_send_server_hello(SSL *s)
1278         {
1279         unsigned char *buf;
1280         unsigned char *p,*d;
1281         int i,sl;
1282         unsigned long l;
1283 #ifdef OPENSSL_NO_TLSEXT
1284         unsigned long Time;
1285 #endif
1286
1287         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
1288                 {
1289                 buf=(unsigned char *)s->init_buf->data;
1290 #ifdef OPENSSL_NO_TLSEXT
1291                 p=s->s3->server_random;
1292                 /* Generate server_random if it was not needed previously */
1293                 Time=(unsigned long)time(NULL);                 /* Time */
1294                 l2n(Time,p);
1295                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
1296                         return -1;
1297 #endif
1298                 /* Do the message type and length last */
1299                 d=p= &(buf[4]);
1300
1301                 *(p++)=s->version>>8;
1302                 *(p++)=s->version&0xff;
1303
1304                 /* Random stuff */
1305                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
1306                 p+=SSL3_RANDOM_SIZE;
1307
1308                 /* now in theory we have 3 options to sending back the
1309                  * session id.  If it is a re-use, we send back the
1310                  * old session-id, if it is a new session, we send
1311                  * back the new session-id or we send back a 0 length
1312                  * session-id if we want it to be single use.
1313                  * Currently I will not implement the '0' length session-id
1314                  * 12-Jan-98 - I'll now support the '0' length stuff.
1315                  *
1316                  * We also have an additional case where stateless session
1317                  * resumption is successful: we always send back the old
1318                  * session id. In this case s->hit is non zero: this can
1319                  * only happen if stateless session resumption is succesful
1320                  * if session caching is disabled so existing functionality
1321                  * is unaffected.
1322                  */
1323                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)
1324                         && !s->hit)
1325                         s->session->session_id_length=0;
1326
1327                 sl=s->session->session_id_length;
1328                 if (sl > (int)sizeof(s->session->session_id))
1329                         {
1330                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1331                         return -1;
1332                         }
1333                 *(p++)=sl;
1334                 memcpy(p,s->session->session_id,sl);
1335                 p+=sl;
1336
1337                 /* put the cipher */
1338                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
1339                 p+=i;
1340
1341                 /* put the compression method */
1342 #ifdef OPENSSL_NO_COMP
1343                         *(p++)=0;
1344 #else
1345                 if (s->s3->tmp.new_compression == NULL)
1346                         *(p++)=0;
1347                 else
1348                         *(p++)=s->s3->tmp.new_compression->id;
1349 #endif
1350 #ifndef OPENSSL_NO_TLSEXT
1351                 if (ssl_prepare_serverhello_tlsext(s) <= 0)
1352                         {
1353                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
1354                         return -1;
1355                         }
1356                 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
1357                         {
1358                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
1359                         return -1;
1360                         }
1361 #endif
1362                 /* do the header */
1363                 l=(p-d);
1364                 d=buf;
1365                 *(d++)=SSL3_MT_SERVER_HELLO;
1366                 l2n3(l,d);
1367
1368                 s->state=SSL3_ST_SW_SRVR_HELLO_B;
1369                 /* number of bytes to write */
1370                 s->init_num=p-buf;
1371                 s->init_off=0;
1372                 }
1373
1374         /* SSL3_ST_SW_SRVR_HELLO_B */
1375         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1376         }
1377
1378 int ssl3_send_server_done(SSL *s)
1379         {
1380         unsigned char *p;
1381
1382         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1383                 {
1384                 p=(unsigned char *)s->init_buf->data;
1385
1386                 /* do the header */
1387                 *(p++)=SSL3_MT_SERVER_DONE;
1388                 *(p++)=0;
1389                 *(p++)=0;
1390                 *(p++)=0;
1391
1392                 s->state=SSL3_ST_SW_SRVR_DONE_B;
1393                 /* number of bytes to write */
1394                 s->init_num=4;
1395                 s->init_off=0;
1396                 }
1397
1398         /* SSL3_ST_SW_SRVR_DONE_B */
1399         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1400         }
1401
1402 int ssl3_send_server_key_exchange(SSL *s)
1403         {
1404 #ifndef OPENSSL_NO_RSA
1405         unsigned char *q;
1406         int j,num;
1407         RSA *rsa;
1408         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1409         unsigned int u;
1410 #endif
1411 #ifndef OPENSSL_NO_DH
1412         DH *dh=NULL,*dhp;
1413 #endif
1414 #ifndef OPENSSL_NO_ECDH
1415         EC_KEY *ecdh=NULL, *ecdhp;
1416         unsigned char *encodedPoint = NULL;
1417         int encodedlen = 0;
1418         int curve_id = 0;
1419         BN_CTX *bn_ctx = NULL;
1420 #endif
1421         EVP_PKEY *pkey;
1422         unsigned char *p,*d;
1423         int al,i;
1424         unsigned long type;
1425         int n;
1426         CERT *cert;
1427         BIGNUM *r[4];
1428         int nr[4],kn;
1429         BUF_MEM *buf;
1430         EVP_MD_CTX md_ctx;
1431
1432         EVP_MD_CTX_init(&md_ctx);
1433         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1434                 {
1435                 type=s->s3->tmp.new_cipher->algorithm_mkey;
1436                 cert=s->cert;
1437
1438                 buf=s->init_buf;
1439
1440                 r[0]=r[1]=r[2]=r[3]=NULL;
1441                 n=0;
1442 #ifndef OPENSSL_NO_RSA
1443                 if (type & SSL_kRSA)
1444                         {
1445                         rsa=cert->rsa_tmp;
1446                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1447                                 {
1448                                 rsa=s->cert->rsa_tmp_cb(s,
1449                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1450                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1451                                 if(rsa == NULL)
1452                                 {
1453                                         al=SSL_AD_HANDSHAKE_FAILURE;
1454                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1455                                         goto f_err;
1456                                 }
1457                                 RSA_up_ref(rsa);
1458                                 cert->rsa_tmp=rsa;
1459                                 }
1460                         if (rsa == NULL)
1461                                 {
1462                                 al=SSL_AD_HANDSHAKE_FAILURE;
1463                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1464                                 goto f_err;
1465                                 }
1466                         r[0]=rsa->n;
1467                         r[1]=rsa->e;
1468                         s->s3->tmp.use_rsa_tmp=1;
1469                         }
1470                 else
1471 #endif
1472 #ifndef OPENSSL_NO_DH
1473                         if (type & SSL_kEDH)
1474                         {
1475                         dhp=cert->dh_tmp;
1476                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1477                                 dhp=s->cert->dh_tmp_cb(s,
1478                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1479                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1480                         if (dhp == NULL)
1481                                 {
1482                                 al=SSL_AD_HANDSHAKE_FAILURE;
1483                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1484                                 goto f_err;
1485                                 }
1486
1487                         if (s->s3->tmp.dh != NULL)
1488                                 {
1489                                 DH_free(dh);
1490                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1491                                 goto err;
1492                                 }
1493
1494                         if ((dh=DHparams_dup(dhp)) == NULL)
1495                                 {
1496                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1497                                 goto err;
1498                                 }
1499
1500                         s->s3->tmp.dh=dh;
1501                         if ((dhp->pub_key == NULL ||
1502                              dhp->priv_key == NULL ||
1503                              (s->options & SSL_OP_SINGLE_DH_USE)))
1504                                 {
1505                                 if(!DH_generate_key(dh))
1506                                     {
1507                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1508                                            ERR_R_DH_LIB);
1509                                     goto err;
1510                                     }
1511                                 }
1512                         else
1513                                 {
1514                                 dh->pub_key=BN_dup(dhp->pub_key);
1515                                 dh->priv_key=BN_dup(dhp->priv_key);
1516                                 if ((dh->pub_key == NULL) ||
1517                                         (dh->priv_key == NULL))
1518                                         {
1519                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1520                                         goto err;
1521                                         }
1522                                 }
1523                         r[0]=dh->p;
1524                         r[1]=dh->g;
1525                         r[2]=dh->pub_key;
1526                         }
1527                 else
1528 #endif
1529 #ifndef OPENSSL_NO_ECDH
1530                         if (type & SSL_kEECDH)
1531                         {
1532                         const EC_GROUP *group;
1533
1534                         ecdhp=cert->ecdh_tmp;
1535                         if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
1536                                 {
1537                                 ecdhp=s->cert->ecdh_tmp_cb(s,
1538                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1539                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1540                                 }
1541                         if (ecdhp == NULL)
1542                                 {
1543                                 al=SSL_AD_HANDSHAKE_FAILURE;
1544                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1545                                 goto f_err;
1546                                 }
1547
1548                         if (s->s3->tmp.ecdh != NULL)
1549                                 {
1550                                 EC_KEY_free(s->s3->tmp.ecdh);
1551                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1552                                 goto err;
1553                                 }
1554
1555                         /* Duplicate the ECDH structure. */
1556                         if (ecdhp == NULL)
1557                                 {
1558                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1559                                 goto err;
1560                                 }
1561                         if (!EC_KEY_up_ref(ecdhp))
1562                                 {
1563                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1564                                 goto err;
1565                                 }
1566                         ecdh = ecdhp;
1567
1568                         s->s3->tmp.ecdh=ecdh;
1569                         if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1570                             (EC_KEY_get0_private_key(ecdh) == NULL) ||
1571                             (s->options & SSL_OP_SINGLE_ECDH_USE))
1572                                 {
1573                                 if(!EC_KEY_generate_key(ecdh))
1574                                     {
1575                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1576                                     goto err;
1577                                     }
1578                                 }
1579
1580                         if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1581                             (EC_KEY_get0_public_key(ecdh)  == NULL) ||
1582                             (EC_KEY_get0_private_key(ecdh) == NULL))
1583                                 {
1584                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1585                                 goto err;
1586                                 }
1587
1588                         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1589                             (EC_GROUP_get_degree(group) > 163))
1590                                 {
1591                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1592                                 goto err;
1593                                 }
1594
1595                         /* XXX: For now, we only support ephemeral ECDH
1596                          * keys over named (not generic) curves. For
1597                          * supported named curves, curve_id is non-zero.
1598                          */
1599                         if ((curve_id =
1600                             tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1601                             == 0)
1602                                 {
1603                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1604                                 goto err;
1605                                 }
1606
1607                         /* Encode the public key.
1608                          * First check the size of encoding and
1609                          * allocate memory accordingly.
1610                          */
1611                         encodedlen = EC_POINT_point2oct(group,
1612                             EC_KEY_get0_public_key(ecdh),
1613                             POINT_CONVERSION_UNCOMPRESSED,
1614                             NULL, 0, NULL);
1615
1616                         encodedPoint = (unsigned char *)
1617                             OPENSSL_malloc(encodedlen*sizeof(unsigned char));
1618                         bn_ctx = BN_CTX_new();
1619                         if ((encodedPoint == NULL) || (bn_ctx == NULL))
1620                                 {
1621                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1622                                 goto err;
1623                                 }
1624
1625
1626                         encodedlen = EC_POINT_point2oct(group,
1627                             EC_KEY_get0_public_key(ecdh),
1628                             POINT_CONVERSION_UNCOMPRESSED,
1629                             encodedPoint, encodedlen, bn_ctx);
1630
1631                         if (encodedlen == 0)
1632                                 {
1633                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1634                                 goto err;
1635                                 }
1636
1637                         BN_CTX_free(bn_ctx);  bn_ctx=NULL;
1638
1639                         /* XXX: For now, we only support named (not
1640                          * generic) curves in ECDH ephemeral key exchanges.
1641                          * In this situation, we need four additional bytes
1642                          * to encode the entire ServerECDHParams
1643                          * structure.
1644                          */
1645                         n = 4 + encodedlen;
1646
1647                         /* We'll generate the serverKeyExchange message
1648                          * explicitly so we can set these to NULLs
1649                          */
1650                         r[0]=NULL;
1651                         r[1]=NULL;
1652                         r[2]=NULL;
1653                         r[3]=NULL;
1654                         }
1655                 else
1656 #endif /* !OPENSSL_NO_ECDH */
1657 #ifndef OPENSSL_NO_PSK
1658                         if (type & SSL_kPSK)
1659                                 {
1660                                 /* reserve size for record length and PSK identity hint*/
1661                                 n+=2+strlen(s->ctx->psk_identity_hint);
1662                                 }
1663                         else
1664 #endif /* !OPENSSL_NO_PSK */
1665                         {
1666                         al=SSL_AD_HANDSHAKE_FAILURE;
1667                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1668                         goto f_err;
1669                         }
1670                 for (i=0; r[i] != NULL; i++)
1671                         {
1672                         nr[i]=BN_num_bytes(r[i]);
1673                         n+=2+nr[i];
1674                         }
1675
1676                 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1677                         && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
1678                         {
1679                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
1680                                 == NULL)
1681                                 {
1682                                 al=SSL_AD_DECODE_ERROR;
1683                                 goto f_err;
1684                                 }
1685                         kn=EVP_PKEY_size(pkey);
1686                         }
1687                 else
1688                         {
1689                         pkey=NULL;
1690                         kn=0;
1691                         }
1692
1693                 if (!BUF_MEM_grow_clean(buf,n+4+kn))
1694                         {
1695                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1696                         goto err;
1697                         }
1698                 d=(unsigned char *)s->init_buf->data;
1699                 p= &(d[4]);
1700
1701                 for (i=0; r[i] != NULL; i++)
1702                         {
1703                         s2n(nr[i],p);
1704                         BN_bn2bin(r[i],p);
1705                         p+=nr[i];
1706                         }
1707
1708 #ifndef OPENSSL_NO_ECDH
1709                 if (type & SSL_kEECDH)
1710                         {
1711                         /* XXX: For now, we only support named (not generic) curves.
1712                          * In this situation, the serverKeyExchange message has:
1713                          * [1 byte CurveType], [2 byte CurveName]
1714                          * [1 byte length of encoded point], followed by
1715                          * the actual encoded point itself
1716                          */
1717                         *p = NAMED_CURVE_TYPE;
1718                         p += 1;
1719                         *p = 0;
1720                         p += 1;
1721                         *p = curve_id;
1722                         p += 1;
1723                         *p = encodedlen;
1724                         p += 1;
1725                         memcpy((unsigned char*)p,
1726                             (unsigned char *)encodedPoint,
1727                             encodedlen);
1728                         OPENSSL_free(encodedPoint);
1729                         p += encodedlen;
1730                         }
1731 #endif
1732
1733 #ifndef OPENSSL_NO_PSK
1734                 if (type & SSL_kPSK)
1735                         {
1736                         /* copy PSK identity hint */
1737                         s2n(strlen(s->ctx->psk_identity_hint), p);
1738                         strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
1739                         p+=strlen(s->ctx->psk_identity_hint);
1740                         }
1741 #endif
1742
1743                 /* not anonymous */
1744                 if (pkey != NULL)
1745                         {
1746                         /* n is the length of the params, they start at &(d[4])
1747                          * and p points to the space at the end. */
1748 #ifndef OPENSSL_NO_RSA
1749                         if (pkey->type == EVP_PKEY_RSA)
1750                                 {
1751                                 q=md_buf;
1752                                 j=0;
1753                                 for (num=2; num > 0; num--)
1754                                         {
1755                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1756                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1757                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1758                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1759                                         EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1760                                         EVP_DigestFinal_ex(&md_ctx,q,
1761                                                 (unsigned int *)&i);
1762                                         q+=i;
1763                                         j+=i;
1764                                         }
1765                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1766                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1767                                         {
1768                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1769                                         goto err;
1770                                         }
1771                                 s2n(u,p);
1772                                 n+=u+2;
1773                                 }
1774                         else
1775 #endif
1776 #if !defined(OPENSSL_NO_DSA)
1777                                 if (pkey->type == EVP_PKEY_DSA)
1778                                 {
1779                                 /* lets do DSS */
1780                                 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
1781                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1782                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1783                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1784                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1785                                         (unsigned int *)&i,pkey))
1786                                         {
1787                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1788                                         goto err;
1789                                         }
1790                                 s2n(i,p);
1791                                 n+=i+2;
1792                                 }
1793                         else
1794 #endif
1795 #if !defined(OPENSSL_NO_ECDSA)
1796                                 if (pkey->type == EVP_PKEY_EC)
1797                                 {
1798                                 /* let's do ECDSA */
1799                                 EVP_SignInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1800                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1801                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1802                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1803                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1804                                         (unsigned int *)&i,pkey))
1805                                         {
1806                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_ECDSA);
1807                                         goto err;
1808                                         }
1809                                 s2n(i,p);
1810                                 n+=i+2;
1811                                 }
1812                         else
1813 #endif
1814                                 {
1815                                 /* Is this error check actually needed? */
1816                                 al=SSL_AD_HANDSHAKE_FAILURE;
1817                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1818                                 goto f_err;
1819                                 }
1820                         }
1821
1822                 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
1823                 l2n3(n,d);
1824
1825                 /* we should now have things packed up, so lets send
1826                  * it off */
1827                 s->init_num=n+4;
1828                 s->init_off=0;
1829                 }
1830
1831         s->state = SSL3_ST_SW_KEY_EXCH_B;
1832         EVP_MD_CTX_cleanup(&md_ctx);
1833         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1834 f_err:
1835         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1836 err:
1837 #ifndef OPENSSL_NO_ECDH
1838         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1839         BN_CTX_free(bn_ctx);
1840 #endif
1841         EVP_MD_CTX_cleanup(&md_ctx);
1842         return(-1);
1843         }
1844
1845 int ssl3_send_certificate_request(SSL *s)
1846         {
1847         unsigned char *p,*d;
1848         int i,j,nl,off,n;
1849         STACK_OF(X509_NAME) *sk=NULL;
1850         X509_NAME *name;
1851         BUF_MEM *buf;
1852
1853         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1854                 {
1855                 buf=s->init_buf;
1856
1857                 d=p=(unsigned char *)&(buf->data[4]);
1858
1859                 /* get the list of acceptable cert types */
1860                 p++;
1861                 n=ssl3_get_req_cert_type(s,p);
1862                 d[0]=n;
1863                 p+=n;
1864                 n++;
1865
1866                 off=n;
1867                 p+=2;
1868                 n+=2;
1869
1870                 sk=SSL_get_client_CA_list(s);
1871                 nl=0;
1872                 if (sk != NULL)
1873                         {
1874                         for (i=0; i<sk_X509_NAME_num(sk); i++)
1875                                 {
1876                                 name=sk_X509_NAME_value(sk,i);
1877                                 j=i2d_X509_NAME(name,NULL);
1878                                 if (!BUF_MEM_grow_clean(buf,4+n+j+2))
1879                                         {
1880                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1881                                         goto err;
1882                                         }
1883                                 p=(unsigned char *)&(buf->data[4+n]);
1884                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1885                                         {
1886                                         s2n(j,p);
1887                                         i2d_X509_NAME(name,&p);
1888                                         n+=2+j;
1889                                         nl+=2+j;
1890                                         }
1891                                 else
1892                                         {
1893                                         d=p;
1894                                         i2d_X509_NAME(name,&p);
1895                                         j-=2; s2n(j,d); j+=2;
1896                                         n+=j;
1897                                         nl+=j;
1898                                         }
1899                                 }
1900                         }
1901                 /* else no CA names */
1902                 p=(unsigned char *)&(buf->data[4+off]);
1903                 s2n(nl,p);
1904
1905                 d=(unsigned char *)buf->data;
1906                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1907                 l2n3(n,d);
1908
1909                 /* we should now have things packed up, so lets send
1910                  * it off */
1911
1912                 s->init_num=n+4;
1913                 s->init_off=0;
1914 #ifdef NETSCAPE_HANG_BUG
1915                 p=(unsigned char *)s->init_buf->data + s->init_num;
1916
1917                 /* do the header */
1918                 *(p++)=SSL3_MT_SERVER_DONE;
1919                 *(p++)=0;
1920                 *(p++)=0;
1921                 *(p++)=0;
1922                 s->init_num += 4;
1923 #endif
1924
1925                 s->state = SSL3_ST_SW_CERT_REQ_B;
1926                 }
1927
1928         /* SSL3_ST_SW_CERT_REQ_B */
1929         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1930 err:
1931         return(-1);
1932         }
1933
1934 int ssl3_get_client_key_exchange(SSL *s)
1935         {
1936         int i,al,ok;
1937         long n;
1938         unsigned long alg_k;
1939         unsigned char *p;
1940 #ifndef OPENSSL_NO_RSA
1941         RSA *rsa=NULL;
1942         EVP_PKEY *pkey=NULL;
1943 #endif
1944 #ifndef OPENSSL_NO_DH
1945         BIGNUM *pub=NULL;
1946         DH *dh_srvr;
1947 #endif
1948 #ifndef OPENSSL_NO_KRB5
1949         KSSL_ERR kssl_err;
1950 #endif /* OPENSSL_NO_KRB5 */
1951
1952 #ifndef OPENSSL_NO_ECDH
1953         EC_KEY *srvr_ecdh = NULL;
1954         EVP_PKEY *clnt_pub_pkey = NULL;
1955         EC_POINT *clnt_ecpoint = NULL;
1956         BN_CTX *bn_ctx = NULL;
1957 #endif
1958
1959         n=s->method->ssl_get_message(s,
1960                 SSL3_ST_SR_KEY_EXCH_A,
1961                 SSL3_ST_SR_KEY_EXCH_B,
1962                 SSL3_MT_CLIENT_KEY_EXCHANGE,
1963                 2048, /* ??? */
1964                 &ok);
1965
1966         if (!ok) return((int)n);
1967         p=(unsigned char *)s->init_msg;
1968
1969         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
1970
1971 #ifndef OPENSSL_NO_RSA
1972         if (alg_k & SSL_kRSA)
1973                 {
1974                 /* FIX THIS UP EAY EAY EAY EAY */
1975                 if (s->s3->tmp.use_rsa_tmp)
1976                         {
1977                         if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
1978                                 rsa=s->cert->rsa_tmp;
1979                         /* Don't do a callback because rsa_tmp should
1980                          * be sent already */
1981                         if (rsa == NULL)
1982                                 {
1983                                 al=SSL_AD_HANDSHAKE_FAILURE;
1984                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
1985                                 goto f_err;
1986
1987                                 }
1988                         }
1989                 else
1990                         {
1991                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
1992                         if (    (pkey == NULL) ||
1993                                 (pkey->type != EVP_PKEY_RSA) ||
1994                                 (pkey->pkey.rsa == NULL))
1995                                 {
1996                                 al=SSL_AD_HANDSHAKE_FAILURE;
1997                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
1998                                 goto f_err;
1999                                 }
2000                         rsa=pkey->pkey.rsa;
2001                         }
2002
2003                 /* TLS and [incidentally] DTLS{0xFEFF} */
2004                 if (s->version > SSL3_VERSION && s->version != DTLS1_BAD_VER)
2005                         {
2006                         n2s(p,i);
2007                         if (n != i+2)
2008                                 {
2009                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
2010                                         {
2011                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
2012                                         goto err;
2013                                         }
2014                                 else
2015                                         p-=2;
2016                                 }
2017                         else
2018                                 n=i;
2019                         }
2020
2021                 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
2022
2023                 al = -1;
2024
2025                 if (i != SSL_MAX_MASTER_KEY_LENGTH)
2026                         {
2027                         al=SSL_AD_DECODE_ERROR;
2028                         /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT); */
2029                         }
2030
2031                 if ((al == -1) && !((p[0] == (s->client_version>>8)) && (p[1] == (s->client_version & 0xff))))
2032                         {
2033                         /* The premaster secret must contain the same version number as the
2034                          * ClientHello to detect version rollback attacks (strangely, the
2035                          * protocol does not offer such protection for DH ciphersuites).
2036                          * However, buggy clients exist that send the negotiated protocol
2037                          * version instead if the server does not support the requested
2038                          * protocol version.
2039                          * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
2040                         if (!((s->options & SSL_OP_TLS_ROLLBACK_BUG) &&
2041                                 (p[0] == (s->version>>8)) && (p[1] == (s->version & 0xff))))
2042                                 {
2043                                 al=SSL_AD_DECODE_ERROR;
2044                                 /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER); */
2045
2046                                 /* The Klima-Pokorny-Rosa extension of Bleichenbacher's attack
2047                                  * (http://eprint.iacr.org/2003/052/) exploits the version
2048                                  * number check as a "bad version oracle" -- an alert would
2049                                  * reveal that the plaintext corresponding to some ciphertext
2050                                  * made up by the adversary is properly formatted except
2051                                  * that the version number is wrong.  To avoid such attacks,
2052                                  * we should treat this just like any other decryption error. */
2053                                 }
2054                         }
2055
2056                 if (al != -1)
2057                         {
2058                         /* Some decryption failure -- use random value instead as countermeasure
2059                          * against Bleichenbacher's attack on PKCS #1 v1.5 RSA padding
2060                          * (see RFC 2246, section 7.4.7.1). */
2061                         ERR_clear_error();
2062                         i = SSL_MAX_MASTER_KEY_LENGTH;
2063                         p[0] = s->client_version >> 8;
2064                         p[1] = s->client_version & 0xff;
2065                         if (RAND_pseudo_bytes(p+2, i-2) <= 0) /* should be RAND_bytes, but we cannot work around a failure */
2066                                 goto err;
2067                         }
2068
2069                 s->session->master_key_length=
2070                         s->method->ssl3_enc->generate_master_secret(s,
2071                                 s->session->master_key,
2072                                 p,i);
2073                 OPENSSL_cleanse(p,i);
2074                 }
2075         else
2076 #endif
2077 #ifndef OPENSSL_NO_DH
2078                 if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2079                 {
2080                 n2s(p,i);
2081                 if (n != i+2)
2082                         {
2083                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
2084                                 {
2085                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
2086                                 goto err;
2087                                 }
2088                         else
2089                                 {
2090                                 p-=2;
2091                                 i=(int)n;
2092                                 }
2093                         }
2094
2095                 if (n == 0L) /* the parameters are in the cert */
2096                         {
2097                         al=SSL_AD_HANDSHAKE_FAILURE;
2098                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_DECODE_DH_CERTS);
2099                         goto f_err;
2100                         }
2101                 else
2102                         {
2103                         if (s->s3->tmp.dh == NULL)
2104                                 {
2105                                 al=SSL_AD_HANDSHAKE_FAILURE;
2106                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
2107                                 goto f_err;
2108                                 }
2109                         else
2110                                 dh_srvr=s->s3->tmp.dh;
2111                         }
2112
2113                 pub=BN_bin2bn(p,i,NULL);
2114                 if (pub == NULL)
2115                         {
2116                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
2117                         goto err;
2118                         }
2119
2120                 i=DH_compute_key(p,pub,dh_srvr);
2121
2122                 if (i <= 0)
2123                         {
2124                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2125                         goto err;
2126                         }
2127
2128                 DH_free(s->s3->tmp.dh);
2129                 s->s3->tmp.dh=NULL;
2130
2131                 BN_clear_free(pub);
2132                 pub=NULL;
2133                 s->session->master_key_length=
2134                         s->method->ssl3_enc->generate_master_secret(s,
2135                                 s->session->master_key,p,i);
2136                 OPENSSL_cleanse(p,i);
2137                 }
2138         else
2139 #endif
2140 #ifndef OPENSSL_NO_KRB5
2141         if (alg_k & SSL_kKRB5)
2142                 {
2143                 krb5_error_code         krb5rc;
2144                 krb5_data               enc_ticket;
2145                 krb5_data               authenticator;
2146                 krb5_data               enc_pms;
2147                 KSSL_CTX                *kssl_ctx = s->kssl_ctx;
2148                 EVP_CIPHER_CTX          ciph_ctx;
2149                 const EVP_CIPHER        *enc = NULL;
2150                 unsigned char           iv[EVP_MAX_IV_LENGTH];
2151                 unsigned char           pms[SSL_MAX_MASTER_KEY_LENGTH
2152                                                + EVP_MAX_BLOCK_LENGTH];
2153                 int                  padl, outl;
2154                 krb5_timestamp          authtime = 0;
2155                 krb5_ticket_times       ttimes;
2156
2157                 EVP_CIPHER_CTX_init(&ciph_ctx);
2158
2159                 if (!kssl_ctx)  kssl_ctx = kssl_ctx_new();
2160
2161                 n2s(p,i);
2162                 enc_ticket.length = i;
2163
2164                 if (n < (long)(enc_ticket.length + 6))
2165                         {
2166                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2167                                 SSL_R_DATA_LENGTH_TOO_LONG);
2168                         goto err;
2169                         }
2170
2171                 enc_ticket.data = (char *)p;
2172                 p+=enc_ticket.length;
2173
2174                 n2s(p,i);
2175                 authenticator.length = i;
2176
2177                 if (n < (long)(enc_ticket.length + authenticator.length + 6))
2178                         {
2179                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2180                                 SSL_R_DATA_LENGTH_TOO_LONG);
2181                         goto err;
2182                         }
2183
2184                 authenticator.data = (char *)p;
2185                 p+=authenticator.length;
2186
2187                 n2s(p,i);
2188                 enc_pms.length = i;
2189                 enc_pms.data = (char *)p;
2190                 p+=enc_pms.length;
2191
2192                 /* Note that the length is checked again below,
2193                 ** after decryption
2194                 */
2195                 if(enc_pms.length > sizeof pms)
2196                         {
2197                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2198                                SSL_R_DATA_LENGTH_TOO_LONG);
2199                         goto err;
2200                         }
2201
2202                 if (n != (long)(enc_ticket.length + authenticator.length +
2203                                                 enc_pms.length + 6))
2204                         {
2205                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2206                                 SSL_R_DATA_LENGTH_TOO_LONG);
2207                         goto err;
2208                         }
2209
2210                 if ((krb5rc = kssl_sget_tkt(kssl_ctx, &enc_ticket, &ttimes,
2211                                         &kssl_err)) != 0)
2212                         {
2213 #ifdef KSSL_DEBUG
2214                         printf("kssl_sget_tkt rtn %d [%d]\n",
2215                                 krb5rc, kssl_err.reason);
2216                         if (kssl_err.text)
2217                                 printf("kssl_err text= %s\n", kssl_err.text);
2218 #endif  /* KSSL_DEBUG */
2219                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2220                                 kssl_err.reason);
2221                         goto err;
2222                         }
2223
2224                 /*  Note: no authenticator is not considered an error,
2225                 **  but will return authtime == 0.
2226                 */
2227                 if ((krb5rc = kssl_check_authent(kssl_ctx, &authenticator,
2228                                         &authtime, &kssl_err)) != 0)
2229                         {
2230 #ifdef KSSL_DEBUG
2231                         printf("kssl_check_authent rtn %d [%d]\n",
2232                                 krb5rc, kssl_err.reason);
2233                         if (kssl_err.text)
2234                                 printf("kssl_err text= %s\n", kssl_err.text);
2235 #endif  /* KSSL_DEBUG */
2236                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2237                                 kssl_err.reason);
2238                         goto err;
2239                         }
2240
2241                 if ((krb5rc = kssl_validate_times(authtime, &ttimes)) != 0)
2242                         {
2243                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, krb5rc);
2244                         goto err;
2245                         }
2246
2247 #ifdef KSSL_DEBUG
2248                 kssl_ctx_show(kssl_ctx);
2249 #endif  /* KSSL_DEBUG */
2250
2251                 enc = kssl_map_enc(kssl_ctx->enctype);
2252                 if (enc == NULL)
2253                     goto err;
2254
2255                 memset(iv, 0, sizeof iv);       /* per RFC 1510 */
2256
2257                 if (!EVP_DecryptInit_ex(&ciph_ctx,enc,NULL,kssl_ctx->key,iv))
2258                         {
2259                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2260                                 SSL_R_DECRYPTION_FAILED);
2261                         goto err;
2262                         }
2263                 if (!EVP_DecryptUpdate(&ciph_ctx, pms,&outl,
2264                                         (unsigned char *)enc_pms.data, enc_pms.length))
2265                         {
2266                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2267                                 SSL_R_DECRYPTION_FAILED);
2268                         goto err;
2269                         }
2270                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2271                         {
2272                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2273                                 SSL_R_DATA_LENGTH_TOO_LONG);
2274                         goto err;
2275                         }
2276                 if (!EVP_DecryptFinal_ex(&ciph_ctx,&(pms[outl]),&padl))
2277                         {
2278                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2279                                 SSL_R_DECRYPTION_FAILED);
2280                         goto err;
2281                         }
2282                 outl += padl;
2283                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2284                         {
2285                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2286                                 SSL_R_DATA_LENGTH_TOO_LONG);
2287                         goto err;
2288                         }
2289                 if (!((p[0] == (s->client_version>>8)) && (p[1] == (s->client_version & 0xff))))
2290                     {
2291                     /* The premaster secret must contain the same version number as the
2292                      * ClientHello to detect version rollback attacks (strangely, the
2293                      * protocol does not offer such protection for DH ciphersuites).
2294                      * However, buggy clients exist that send random bytes instead of
2295                      * the protocol version.
2296                      * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients.
2297                      * (Perhaps we should have a separate BUG value for the Kerberos cipher)
2298                      */
2299                     if (!((s->options & SSL_OP_TLS_ROLLBACK_BUG) &&
2300                            (p[0] == (s->version>>8)) && (p[1] == (s->version & 0xff))))
2301                         {
2302                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2303                                SSL_AD_DECODE_ERROR);
2304                         goto err;
2305                         }
2306                     }
2307
2308                 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2309
2310                 s->session->master_key_length=
2311                         s->method->ssl3_enc->generate_master_secret(s,
2312                                 s->session->master_key, pms, outl);
2313
2314                 if (kssl_ctx->client_princ)
2315                         {
2316                         size_t len = strlen(kssl_ctx->client_princ);
2317                         if ( len < SSL_MAX_KRB5_PRINCIPAL_LENGTH )
2318                                 {
2319                                 s->session->krb5_client_princ_len = len;
2320                                 memcpy(s->session->krb5_client_princ,kssl_ctx->client_princ,len);
2321                                 }
2322                         }
2323
2324
2325                 /*  Was doing kssl_ctx_free() here,
2326                 **  but it caused problems for apache.
2327                 **  kssl_ctx = kssl_ctx_free(kssl_ctx);
2328                 **  if (s->kssl_ctx)  s->kssl_ctx = NULL;
2329                 */
2330                 }
2331         else
2332 #endif  /* OPENSSL_NO_KRB5 */
2333
2334 #ifndef OPENSSL_NO_ECDH
2335                 if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2336                 {
2337                 int ret = 1;
2338                 int field_size = 0;
2339                 const EC_KEY   *tkey;
2340                 const EC_GROUP *group;
2341                 const BIGNUM *priv_key;
2342
2343                 /* initialize structures for server's ECDH key pair */
2344                 if ((srvr_ecdh = EC_KEY_new()) == NULL)
2345                         {
2346                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2347                             ERR_R_MALLOC_FAILURE);
2348                         goto err;
2349                         }
2350
2351                 /* Let's get server private key and group information */
2352                 if (alg_k & (SSL_kECDHr|SSL_kECDHe))
2353                         {
2354                         /* use the certificate */
2355                         tkey = s->cert->pkeys[SSL_PKEY_ECC].privatekey->pkey.ec;
2356                         }
2357                 else
2358                         {
2359                         /* use the ephermeral values we saved when
2360                          * generating the ServerKeyExchange msg.
2361                          */
2362                         tkey = s->s3->tmp.ecdh;
2363                         }
2364
2365                 group    = EC_KEY_get0_group(tkey);
2366                 priv_key = EC_KEY_get0_private_key(tkey);
2367
2368                 if (!EC_KEY_set_group(srvr_ecdh, group) ||
2369                     !EC_KEY_set_private_key(srvr_ecdh, priv_key))
2370                         {
2371                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2372                                ERR_R_EC_LIB);
2373                         goto err;
2374                         }
2375
2376                 /* Let's get client's public key */
2377                 if ((clnt_ecpoint = EC_POINT_new(group)) == NULL)
2378                         {
2379                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2380                             ERR_R_MALLOC_FAILURE);
2381                         goto err;
2382                         }
2383
2384                 if (n == 0L)
2385                         {
2386                         /* Client Publickey was in Client Certificate */
2387
2388                          if (alg_k & SSL_kEECDH)
2389                                  {
2390                                  al=SSL_AD_HANDSHAKE_FAILURE;
2391                                  SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
2392                                  goto f_err;
2393                                  }
2394                         if (((clnt_pub_pkey=X509_get_pubkey(s->session->peer))
2395                             == NULL) ||
2396                             (clnt_pub_pkey->type != EVP_PKEY_EC))
2397                                 {
2398                                 /* XXX: For now, we do not support client
2399                                  * authentication using ECDH certificates
2400                                  * so this branch (n == 0L) of the code is
2401                                  * never executed. When that support is
2402                                  * added, we ought to ensure the key
2403                                  * received in the certificate is
2404                                  * authorized for key agreement.
2405                                  * ECDH_compute_key implicitly checks that
2406                                  * the two ECDH shares are for the same
2407                                  * group.
2408                                  */
2409                                 al=SSL_AD_HANDSHAKE_FAILURE;
2410                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2411                                     SSL_R_UNABLE_TO_DECODE_ECDH_CERTS);
2412                                 goto f_err;
2413                                 }
2414
2415                         if (EC_POINT_copy(clnt_ecpoint,
2416                             EC_KEY_get0_public_key(clnt_pub_pkey->pkey.ec)) == 0)
2417                                 {
2418                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2419                                         ERR_R_EC_LIB);
2420                                 goto err;
2421                                 }
2422                         ret = 2; /* Skip certificate verify processing */
2423                         }
2424                 else
2425                         {
2426                         /* Get client's public key from encoded point
2427                          * in the ClientKeyExchange message.
2428                          */
2429                         if ((bn_ctx = BN_CTX_new()) == NULL)
2430                                 {
2431                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2432                                     ERR_R_MALLOC_FAILURE);
2433                                 goto err;
2434                                 }
2435
2436                         /* Get encoded point length */
2437                         i = *p;
2438                         p += 1;
2439                         if (EC_POINT_oct2point(group,
2440                             clnt_ecpoint, p, i, bn_ctx) == 0)
2441                                 {
2442                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2443                                     ERR_R_EC_LIB);
2444                                 goto err;
2445                                 }
2446                         /* p is pointing to somewhere in the buffer
2447                          * currently, so set it to the start
2448                          */
2449                         p=(unsigned char *)s->init_buf->data;
2450                         }
2451
2452                 /* Compute the shared pre-master secret */
2453                 field_size = EC_GROUP_get_degree(group);
2454                 if (field_size <= 0)
2455                         {
2456                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2457                                ERR_R_ECDH_LIB);
2458                         goto err;
2459                         }
2460                 i = ECDH_compute_key(p, (field_size+7)/8, clnt_ecpoint, srvr_ecdh, NULL);
2461                 if (i <= 0)
2462                         {
2463                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2464                             ERR_R_ECDH_LIB);
2465                         goto err;
2466                         }
2467
2468                 EVP_PKEY_free(clnt_pub_pkey);
2469                 EC_POINT_free(clnt_ecpoint);
2470                 EC_KEY_free(srvr_ecdh);
2471                 BN_CTX_free(bn_ctx);
2472                 EC_KEY_free(s->s3->tmp.ecdh);
2473                 s->s3->tmp.ecdh = NULL;
2474
2475                 /* Compute the master secret */
2476                 s->session->master_key_length = s->method->ssl3_enc-> \
2477                     generate_master_secret(s, s->session->master_key, p, i);
2478
2479                 OPENSSL_cleanse(p, i);
2480                 return (ret);
2481                 }
2482         else
2483 #endif
2484 #ifndef OPENSSL_NO_PSK
2485                 if (alg_k & SSL_kPSK)
2486                         {
2487                         unsigned char *t = NULL;
2488                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
2489                         unsigned int pre_ms_len = 0, psk_len = 0;
2490                         int psk_err = 1;
2491                         char tmp_id[PSK_MAX_IDENTITY_LEN+1];
2492
2493                         al=SSL_AD_HANDSHAKE_FAILURE;
2494
2495                         n2s(p,i);
2496                         if (n != i+2)
2497                                 {
2498                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2499                                         SSL_R_LENGTH_MISMATCH);
2500                                 goto psk_err;
2501                                 }
2502                         if (i > PSK_MAX_IDENTITY_LEN)
2503                                 {
2504                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2505                                         SSL_R_DATA_LENGTH_TOO_LONG);
2506                                 goto psk_err;
2507                                 }
2508                         if (s->psk_server_callback == NULL)
2509                                 {
2510                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2511                                        SSL_R_PSK_NO_SERVER_CB);
2512                                 goto psk_err;
2513                                 }
2514
2515                         /* Create guaranteed NULL-terminated identity
2516                          * string for the callback */
2517                         memcpy(tmp_id, p, i);
2518                         memset(tmp_id+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
2519                         psk_len = s->psk_server_callback(s, tmp_id,
2520                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
2521                         OPENSSL_cleanse(tmp_id, PSK_MAX_IDENTITY_LEN+1);
2522
2523                         if (psk_len > PSK_MAX_PSK_LEN)
2524                                 {
2525                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2526                                         ERR_R_INTERNAL_ERROR);
2527                                 goto psk_err;
2528                                 }
2529                         else if (psk_len == 0)
2530                                 {
2531                                 /* PSK related to the given identity not found */
2532                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2533                                        SSL_R_PSK_IDENTITY_NOT_FOUND);
2534                                 al=SSL_AD_UNKNOWN_PSK_IDENTITY;
2535                                 goto psk_err;
2536                                 }
2537
2538                         /* create PSK pre_master_secret */
2539                         pre_ms_len=2+psk_len+2+psk_len;
2540                         t = psk_or_pre_ms;
2541                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
2542                         s2n(psk_len, t);
2543                         memset(t, 0, psk_len);
2544                         t+=psk_len;
2545                         s2n(psk_len, t);
2546
2547                         if (s->session->psk_identity != NULL)
2548                                 OPENSSL_free(s->session->psk_identity);
2549                         s->session->psk_identity = BUF_strdup((char *)p);
2550                         if (s->session->psk_identity == NULL)
2551                                 {
2552                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2553                                         ERR_R_MALLOC_FAILURE);
2554                                 goto psk_err;
2555                                 }
2556
2557                         if (s->session->psk_identity_hint != NULL)
2558                                 OPENSSL_free(s->session->psk_identity_hint);
2559                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
2560                         if (s->ctx->psk_identity_hint != NULL &&
2561                                 s->session->psk_identity_hint == NULL)
2562                                 {
2563                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2564                                         ERR_R_MALLOC_FAILURE);
2565                                 goto psk_err;
2566                                 }
2567
2568                         s->session->master_key_length=
2569                                 s->method->ssl3_enc->generate_master_secret(s,
2570                                         s->session->master_key, psk_or_pre_ms, pre_ms_len);
2571                         psk_err = 0;
2572                 psk_err:
2573                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
2574                         if (psk_err != 0)
2575                                 goto f_err;
2576                         }
2577                 else
2578 #endif
2579                 if (alg_k & SSL_kGOST)
2580                         {
2581                         int ret = 0;
2582                         EVP_PKEY_CTX *pkey_ctx;
2583                         EVP_PKEY *client_pub_pkey = NULL;
2584                         unsigned char premaster_secret[32], *start;
2585                         size_t outlen=32, inlen;
2586
2587                         /* Get our certificate private key*/
2588                         pkey_ctx = EVP_PKEY_CTX_new(s->cert->key->privatekey,NULL);
2589                         EVP_PKEY_decrypt_init(pkey_ctx);
2590                         /* If client certificate is present and is of the same type, maybe
2591                          * use it for key exchange.  Don't mind errors from
2592                          * EVP_PKEY_derive_set_peer, because it is completely valid to use
2593                          * a client certificate for authorization only. */
2594                         client_pub_pkey = X509_get_pubkey(s->session->peer);
2595                         if (client_pub_pkey)
2596                                 {
2597                                 if (EVP_PKEY_derive_set_peer(pkey_ctx, client_pub_pkey) <= 0)
2598                                         ERR_clear_error();
2599                                 }
2600                         /* Decrypt session key */
2601                         if ((*p!=( V_ASN1_SEQUENCE| V_ASN1_CONSTRUCTED)))
2602                                 {
2603                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2604                                 goto gerr;
2605                                 }
2606                         if (p[1] == 0x81)
2607                                 {
2608                                 start = p+3;
2609                                 inlen = p[2];
2610                                 }
2611                         else if (p[1] < 0x80)
2612                                 {
2613                                 start = p+2;
2614                                 inlen = p[1];
2615                                 }
2616                         else
2617                                 {
2618                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2619                                 goto gerr;
2620                                 }
2621                         if (EVP_PKEY_decrypt(pkey_ctx,premaster_secret,&outlen,start,inlen) <=0)
2622
2623                                 {
2624                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2625                                 goto gerr;
2626                                 }
2627                         /* Generate master secret */
2628                         s->session->master_key_length=
2629                                 s->method->ssl3_enc->generate_master_secret(s,
2630                                         s->session->master_key,premaster_secret,32);
2631                         /* Check if pubkey from client certificate was used */
2632                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
2633                                 ret = 2;
2634                         else
2635                                 ret = 1;
2636                 gerr:
2637                         EVP_PKEY_free(client_pub_pkey);
2638                         EVP_PKEY_CTX_free(pkey_ctx);
2639                         if (ret)
2640                                 return ret;
2641                         else
2642                                 goto err;
2643                         }
2644                 else
2645                 {
2646                 al=SSL_AD_HANDSHAKE_FAILURE;
2647                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2648                                 SSL_R_UNKNOWN_CIPHER_TYPE);
2649                 goto f_err;
2650                 }
2651
2652         return(1);
2653 f_err:
2654         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2655 #if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA) || !defined(OPENSSL_NO_ECDH)
2656 err:
2657 #endif
2658 #ifndef OPENSSL_NO_ECDH
2659         EVP_PKEY_free(clnt_pub_pkey);
2660         EC_POINT_free(clnt_ecpoint);
2661         if (srvr_ecdh != NULL)
2662                 EC_KEY_free(srvr_ecdh);
2663         BN_CTX_free(bn_ctx);
2664 #endif
2665         return(-1);
2666         }
2667
2668 int ssl3_get_cert_verify(SSL *s)
2669         {
2670         EVP_PKEY *pkey=NULL;
2671         unsigned char *p;
2672         int al,ok,ret=0;
2673         long n;
2674         int type=0,i,j;
2675         X509 *peer;
2676
2677         n=s->method->ssl_get_message(s,
2678                 SSL3_ST_SR_CERT_VRFY_A,
2679                 SSL3_ST_SR_CERT_VRFY_B,
2680                 -1,
2681                 514, /* 514? */
2682                 &ok);
2683
2684         if (!ok) return((int)n);
2685
2686         if (s->session->peer != NULL)
2687                 {
2688                 peer=s->session->peer;
2689                 pkey=X509_get_pubkey(peer);
2690                 type=X509_certificate_type(peer,pkey);
2691                 }
2692         else
2693                 {
2694                 peer=NULL;
2695                 pkey=NULL;
2696                 }
2697
2698         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
2699                 {
2700                 s->s3->tmp.reuse_message=1;
2701                 if ((peer != NULL) && (type | EVP_PKT_SIGN))
2702                         {
2703                         al=SSL_AD_UNEXPECTED_MESSAGE;
2704                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
2705                         goto f_err;
2706                         }
2707                 ret=1;
2708                 goto end;
2709                 }
2710
2711         if (peer == NULL)
2712                 {
2713                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
2714                 al=SSL_AD_UNEXPECTED_MESSAGE;
2715                 goto f_err;
2716                 }
2717
2718         if (!(type & EVP_PKT_SIGN))
2719                 {
2720                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
2721                 al=SSL_AD_ILLEGAL_PARAMETER;
2722                 goto f_err;
2723                 }
2724
2725         if (s->s3->change_cipher_spec)
2726                 {
2727                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
2728                 al=SSL_AD_UNEXPECTED_MESSAGE;
2729                 goto f_err;
2730                 }
2731
2732         /* we now have a signature that we need to verify */
2733         p=(unsigned char *)s->init_msg;
2734         /* Check for broken implementations of GOST ciphersuites */
2735         /* If key is GOST and n is exactly 64, it is bare
2736          * signature without length field */
2737         if (n==64 && (pkey->type==NID_id_GostR3410_94 ||
2738                 pkey->type == NID_id_GostR3410_2001) )
2739                 {
2740                 i=64;
2741                 }
2742         else
2743                 {
2744                 n2s(p,i);
2745                 n-=2;
2746                 if (i > n)
2747                         {
2748                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
2749                         al=SSL_AD_DECODE_ERROR;
2750                         goto f_err;
2751                         }
2752         }
2753         j=EVP_PKEY_size(pkey);
2754         if ((i > j) || (n > j) || (n <= 0))
2755                 {
2756                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
2757                 al=SSL_AD_DECODE_ERROR;
2758                 goto f_err;
2759                 }
2760
2761 #ifndef OPENSSL_NO_RSA
2762         if (pkey->type == EVP_PKEY_RSA)
2763                 {
2764                 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
2765                         MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i,
2766                                                         pkey->pkey.rsa);
2767                 if (i < 0)
2768                         {
2769                         al=SSL_AD_DECRYPT_ERROR;
2770                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
2771                         goto f_err;
2772                         }
2773                 if (i == 0)
2774                         {
2775                         al=SSL_AD_DECRYPT_ERROR;
2776                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
2777                         goto f_err;
2778                         }
2779                 }
2780         else
2781 #endif
2782 #ifndef OPENSSL_NO_DSA
2783                 if (pkey->type == EVP_PKEY_DSA)
2784                 {
2785                 j=DSA_verify(pkey->save_type,
2786                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
2787                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
2788                 if (j <= 0)
2789                         {
2790                         /* bad signature */
2791                         al=SSL_AD_DECRYPT_ERROR;
2792                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
2793                         goto f_err;
2794                         }
2795                 }
2796         else
2797 #endif
2798 #ifndef OPENSSL_NO_ECDSA
2799                 if (pkey->type == EVP_PKEY_EC)
2800                 {
2801                 j=ECDSA_verify(pkey->save_type,
2802                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
2803                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.ec);
2804                 if (j <= 0)
2805                         {
2806                         /* bad signature */
2807                         al=SSL_AD_DECRYPT_ERROR;
2808                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
2809                             SSL_R_BAD_ECDSA_SIGNATURE);
2810                         goto f_err;
2811                         }
2812                 }
2813         else
2814 #endif
2815         if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001)
2816                 {   unsigned char signature[64];
2817                         int idx;
2818                         EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new(pkey,NULL);
2819                         EVP_PKEY_verify_init(pctx);
2820                         if (i!=64) {
2821                                 fprintf(stderr,"GOST signature length is %d",i);
2822                         }
2823                         for (idx=0;idx<64;idx++) {
2824                                 signature[63-idx]=p[idx];
2825                         }
2826                         j=EVP_PKEY_verify(pctx,signature,64,s->s3->tmp.cert_verify_md,32);
2827                         EVP_PKEY_CTX_free(pctx);
2828                         if (j<=0)
2829                                 {
2830                                 al=SSL_AD_DECRYPT_ERROR;
2831                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
2832                                         SSL_R_BAD_ECDSA_SIGNATURE);
2833                                 goto f_err;
2834                                 }
2835                 }
2836         else
2837                 {
2838                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
2839                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
2840                 goto f_err;
2841                 }
2842
2843
2844         ret=1;
2845         if (0)
2846                 {
2847 f_err:
2848                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2849                 }
2850 end:
2851         EVP_PKEY_free(pkey);
2852         return(ret);
2853         }
2854
2855 int ssl3_get_client_certificate(SSL *s)
2856         {
2857         int i,ok,al,ret= -1;
2858         X509 *x=NULL;
2859         unsigned long l,nc,llen,n;
2860         const unsigned char *p,*q;
2861         unsigned char *d;
2862         STACK_OF(X509) *sk=NULL;
2863
2864         n=s->method->ssl_get_message(s,
2865                 SSL3_ST_SR_CERT_A,
2866                 SSL3_ST_SR_CERT_B,
2867                 -1,
2868                 s->max_cert_list,
2869                 &ok);
2870
2871         if (!ok) return((int)n);
2872
2873         if      (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
2874                 {
2875                 if (    (s->verify_mode & SSL_VERIFY_PEER) &&
2876                         (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
2877                         {
2878                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
2879                         al=SSL_AD_HANDSHAKE_FAILURE;
2880                         goto f_err;
2881                         }
2882                 /* If tls asked for a client cert, the client must return a 0 list */
2883                 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
2884                         {
2885                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
2886                         al=SSL_AD_UNEXPECTED_MESSAGE;
2887                         goto f_err;
2888                         }
2889                 s->s3->tmp.reuse_message=1;
2890                 return(1);
2891                 }
2892
2893         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
2894                 {
2895                 al=SSL_AD_UNEXPECTED_MESSAGE;
2896                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
2897                 goto f_err;
2898                 }
2899         p=d=(unsigned char *)s->init_msg;
2900
2901         if ((sk=sk_X509_new_null()) == NULL)
2902                 {
2903                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
2904                 goto err;
2905                 }
2906
2907         n2l3(p,llen);
2908         if (llen+3 != n)
2909                 {
2910                 al=SSL_AD_DECODE_ERROR;
2911                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
2912                 goto f_err;
2913                 }
2914         for (nc=0; nc<llen; )
2915                 {
2916                 n2l3(p,l);
2917                 if ((l+nc+3) > llen)
2918                         {
2919                         al=SSL_AD_DECODE_ERROR;
2920                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
2921                         goto f_err;
2922                         }
2923
2924                 q=p;
2925                 x=d2i_X509(NULL,&p,l);
2926                 if (x == NULL)
2927                         {
2928                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
2929                         goto err;
2930                         }
2931                 if (p != (q+l))
2932                         {
2933                         al=SSL_AD_DECODE_ERROR;
2934                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
2935                         goto f_err;
2936                         }
2937                 if (!sk_X509_push(sk,x))
2938                         {
2939                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
2940                         goto err;
2941                         }
2942                 x=NULL;
2943                 nc+=l+3;
2944                 }
2945
2946         if (sk_X509_num(sk) <= 0)
2947                 {
2948                 /* TLS does not mind 0 certs returned */
2949                 if (s->version == SSL3_VERSION)
2950                         {
2951                         al=SSL_AD_HANDSHAKE_FAILURE;
2952                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
2953                         goto f_err;
2954                         }
2955                 /* Fail for TLS only if we required a certificate */
2956                 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
2957                          (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
2958                         {
2959                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
2960                         al=SSL_AD_HANDSHAKE_FAILURE;
2961                         goto f_err;
2962                         }
2963                 }
2964         else
2965                 {
2966                 i=ssl_verify_cert_chain(s,sk);
2967                 if (i <= 0)
2968                         {
2969                         al=ssl_verify_alarm_type(s->verify_result);
2970                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED);
2971                         goto f_err;
2972                         }
2973                 }
2974
2975         if (s->session->peer != NULL) /* This should not be needed */
2976                 X509_free(s->session->peer);
2977         s->session->peer=sk_X509_shift(sk);
2978         s->session->verify_result = s->verify_result;
2979
2980         /* With the current implementation, sess_cert will always be NULL
2981          * when we arrive here. */
2982         if (s->session->sess_cert == NULL)
2983                 {
2984                 s->session->sess_cert = ssl_sess_cert_new();
2985                 if (s->session->sess_cert == NULL)
2986                         {
2987                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
2988                         goto err;
2989                         }
2990                 }
2991         if (s->session->sess_cert->cert_chain != NULL)
2992                 sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free);
2993         s->session->sess_cert->cert_chain=sk;
2994         /* Inconsistency alert: cert_chain does *not* include the
2995          * peer's own certificate, while we do include it in s3_clnt.c */
2996
2997         sk=NULL;
2998
2999         ret=1;
3000         if (0)
3001                 {
3002 f_err:
3003                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
3004                 }
3005 err:
3006         if (x != NULL) X509_free(x);
3007         if (sk != NULL) sk_X509_pop_free(sk,X509_free);
3008         return(ret);
3009         }
3010
3011 int ssl3_send_server_certificate(SSL *s)
3012         {
3013         unsigned long l;
3014         X509 *x;
3015
3016         if (s->state == SSL3_ST_SW_CERT_A)
3017                 {
3018                 x=ssl_get_server_send_cert(s);
3019                 if (x == NULL)
3020                         {
3021                         /* VRS: allow null cert if auth == KRB5 */
3022                         if ((s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5) ||
3023                             (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5))
3024                                 {
3025                                 SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
3026                                 return(0);
3027                                 }
3028                         }
3029
3030                 l=ssl3_output_cert_chain(s,x);
3031                 s->state=SSL3_ST_SW_CERT_B;
3032                 s->init_num=(int)l;
3033                 s->init_off=0;
3034                 }
3035
3036         /* SSL3_ST_SW_CERT_B */
3037         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3038         }
3039 #ifndef OPENSSL_NO_TLSEXT
3040 int ssl3_send_newsession_ticket(SSL *s)
3041         {
3042         if (s->state == SSL3_ST_SW_SESSION_TICKET_A)
3043                 {
3044                 unsigned char *p, *senc, *macstart;
3045                 int len, slen;
3046                 unsigned int hlen;
3047                 EVP_CIPHER_CTX ctx;
3048                 HMAC_CTX hctx;
3049                 SSL_CTX *tctx = s->initial_ctx;
3050                 unsigned char iv[EVP_MAX_IV_LENGTH];
3051                 unsigned char key_name[16];
3052
3053                 /* get session encoding length */
3054                 slen = i2d_SSL_SESSION(s->session, NULL);
3055                 /* Some length values are 16 bits, so forget it if session is
3056                  * too long
3057                  */
3058                 if (slen > 0xFF00)
3059                         return -1;
3060                 /* Grow buffer if need be: the length calculation is as
3061                  * follows 1 (size of message name) + 3 (message length
3062                  * bytes) + 4 (ticket lifetime hint) + 2 (ticket length) +
3063                  * 16 (key name) + max_iv_len (iv length) +
3064                  * session_length + max_enc_block_size (max encrypted session
3065                  * length) + max_md_size (HMAC).
3066                  */
3067                 if (!BUF_MEM_grow(s->init_buf,
3068                         26 + EVP_MAX_IV_LENGTH + EVP_MAX_BLOCK_LENGTH +
3069                         EVP_MAX_MD_SIZE + slen))
3070                         return -1;
3071                 senc = OPENSSL_malloc(slen);
3072                 if (!senc)
3073                         return -1;
3074                 p = senc;
3075                 i2d_SSL_SESSION(s->session, &p);
3076
3077                 p=(unsigned char *)s->init_buf->data;
3078                 /* do the header */
3079                 *(p++)=SSL3_MT_NEWSESSION_TICKET;
3080                 /* Skip message length for now */
3081                 p += 3;
3082                 EVP_CIPHER_CTX_init(&ctx);
3083                 HMAC_CTX_init(&hctx);
3084                 /* Initialize HMAC and cipher contexts. If callback present
3085                  * it does all the work otherwise use generated values
3086                  * from parent ctx.
3087                  */
3088                 if (tctx->tlsext_ticket_key_cb)
3089                         {
3090                         if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx,
3091                                                          &hctx, 1) < 0)
3092                                 {
3093                                 OPENSSL_free(senc);
3094                                 return -1;
3095                                 }
3096                         }
3097                 else
3098                         {
3099                         RAND_pseudo_bytes(iv, 16);
3100                         EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
3101                                         tctx->tlsext_tick_aes_key, iv);
3102                         HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
3103                                         tlsext_tick_md(), NULL);
3104                         memcpy(key_name, tctx->tlsext_tick_key_name, 16);
3105                         }
3106                 l2n(s->session->tlsext_tick_lifetime_hint, p);
3107                 /* Skip ticket length for now */
3108                 p += 2;
3109                 /* Output key name */
3110                 macstart = p;
3111                 memcpy(p, key_name, 16);
3112                 p += 16;
3113                 /* output IV */
3114                 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
3115                 p += EVP_CIPHER_CTX_iv_length(&ctx);
3116                 /* Encrypt session data */
3117                 EVP_EncryptUpdate(&ctx, p, &len, senc, slen);
3118                 p += len;
3119                 EVP_EncryptFinal(&ctx, p, &len);
3120                 p += len;
3121                 EVP_CIPHER_CTX_cleanup(&ctx);
3122
3123                 HMAC_Update(&hctx, macstart, p - macstart);
3124                 HMAC_Final(&hctx, p, &hlen);
3125                 HMAC_CTX_cleanup(&hctx);
3126
3127                 p += hlen;
3128                 /* Now write out lengths: p points to end of data written */
3129                 /* Total length */
3130                 len = p - (unsigned char *)s->init_buf->data;
3131                 p=(unsigned char *)s->init_buf->data + 1;
3132                 l2n3(len - 4, p); /* Message length */
3133                 p += 4;
3134                 s2n(len - 10, p);  /* Ticket length */
3135
3136                 /* number of bytes to write */
3137                 s->init_num= len;
3138                 s->state=SSL3_ST_SW_SESSION_TICKET_B;
3139                 s->init_off=0;
3140                 OPENSSL_free(senc);
3141                 }
3142
3143         /* SSL3_ST_SW_SESSION_TICKET_B */
3144         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3145         }
3146
3147 int ssl3_send_cert_status(SSL *s)
3148         {
3149         if (s->state == SSL3_ST_SW_CERT_STATUS_A)
3150                 {
3151                 unsigned char *p;
3152                 /* Grow buffer if need be: the length calculation is as
3153                  * follows 1 (message type) + 3 (message length) +
3154                  * 1 (ocsp response type) + 3 (ocsp response length)
3155                  * + (ocsp response)
3156                  */
3157                 if (!BUF_MEM_grow(s->init_buf, 8 + s->tlsext_ocsp_resplen))
3158                         return -1;
3159
3160                 p=(unsigned char *)s->init_buf->data;
3161
3162                 /* do the header */
3163                 *(p++)=SSL3_MT_CERTIFICATE_STATUS;
3164                 /* message length */
3165                 l2n3(s->tlsext_ocsp_resplen + 4, p);
3166                 /* status type */
3167                 *(p++)= s->tlsext_status_type;
3168                 /* length of OCSP response */
3169                 l2n3(s->tlsext_ocsp_resplen, p);
3170                 /* actual response */
3171                 memcpy(p, s->tlsext_ocsp_resp, s->tlsext_ocsp_resplen);
3172                 /* number of bytes to write */
3173                 s->init_num = 8 + s->tlsext_ocsp_resplen;
3174                 s->state=SSL3_ST_SW_CERT_STATUS_B;
3175                 s->init_off = 0;
3176                 }
3177
3178         /* SSL3_ST_SW_CERT_STATUS_B */
3179         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3180         }
3181 #endif