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 "../crypto/constant_time_locl.h"
 158 #include <openssl/buffer.h>
 159 #include <openssl/rand.h>
 160 #include <openssl/objects.h>
 161 #include <openssl/evp.h>
 162 #include <openssl/hmac.h>
 163 #include <openssl/x509.h>
 164 #ifndef OPENSSL_NO_DH
 165 #include <openssl/dh.h>
 166 #endif
 167 #include <openssl/bn.h>
 168 #ifndef OPENSSL_NO_KRB5
 169 #include <openssl/krb5_asn.h>
 170 #endif
 171 #include <openssl/md5.h>
 172
 173 #ifndef OPENSSL_NO_SSL3_METHOD
 174 static const SSL_METHOD *ssl3_get_server_method(int ver);
 175
 176 static const SSL_METHOD *ssl3_get_server_method(int ver)
 177         {
 178         if (ver == SSL3_VERSION)
 179                 return(SSLv3_server_method());
 180         else
 181                 return(NULL);
 182         }
 183
 184 IMPLEMENT_ssl3_meth_func(SSLv3_server_method,
 185                         ssl3_accept,
 186                         ssl_undefined_function,
 187                         ssl3_get_server_method)
 188 #endif
 189
 190 #ifndef OPENSSL_NO_SRP
 191 static int ssl_check_srp_ext_ClientHello(SSL *s, int *al)
 192         {
 193         int ret = SSL_ERROR_NONE;
 194
 195         *al = SSL_AD_UNRECOGNIZED_NAME;
 196
 197         if ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP) &&
 198             (s->srp_ctx.TLS_ext_srp_username_callback != NULL))
 199                 {
 200                 if(s->srp_ctx.login == NULL)
 201                         {
 202                         /* RFC 5054 says SHOULD reject,
 203                            we do so if There is no srp login name */
 204                         ret = SSL3_AL_FATAL;
 205                         *al = SSL_AD_UNKNOWN_PSK_IDENTITY;
 206                         }
 207                 else
 208                         {
 209                         ret = SSL_srp_server_param_with_username(s,al);
 210                         }
 211                 }
 212         return ret;
 213         }
 214 #endif
 215
 216 int ssl3_accept(SSL *s)
 217         {
 218         BUF_MEM *buf;
 219         unsigned long alg_k,Time=(unsigned long)time(NULL);
 220         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 221         int ret= -1;
 222         int new_state,state,skip=0;
 223
 224         RAND_add(&Time,sizeof(Time),0);
 225         ERR_clear_error();
 226         clear_sys_error();
 227
 228         if (s->info_callback != NULL)
 229                 cb=s->info_callback;
 230         else if (s->ctx->info_callback != NULL)
 231                 cb=s->ctx->info_callback;
 232
 233         /* init things to blank */
 234         s->in_handshake++;
 235         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 236
 237         if (s->cert == NULL)
 238                 {
 239                 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
 240                 return(-1);
 241                 }
 242
 243 #ifndef OPENSSL_NO_HEARTBEATS
 244         /* If we're awaiting a HeartbeatResponse, pretend we
 245          * already got and don't await it anymore, because
 246          * Heartbeats don't make sense during handshakes anyway.
 247          */
 248         if (s->tlsext_hb_pending)
 249                 {
 250                 s->tlsext_hb_pending = 0;
 251                 s->tlsext_hb_seq++;
 252                 }
 253 #endif
 254
 255         for (;;)
 256                 {
 257                 state=s->state;
 258
 259                 switch (s->state)
 260                         {
 261                 case SSL_ST_RENEGOTIATE:
 262                         s->renegotiate=1;
 263                         /* s->state=SSL_ST_ACCEPT; */
 264
 265                 case SSL_ST_BEFORE:
 266                 case SSL_ST_ACCEPT:
 267                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 268                 case SSL_ST_OK|SSL_ST_ACCEPT:
 269
 270                         s->server=1;
 271                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 272
 273                         if ((s->version>>8) != 3)
 274                                 {
 275                                 SSLerr(SSL_F_SSL3_ACCEPT, ERR_R_INTERNAL_ERROR);
 276                                 return -1;
 277                                 }
 278                         s->type=SSL_ST_ACCEPT;
 279
 280                         if (s->init_buf == NULL)
 281                                 {
 282                                 if ((buf=BUF_MEM_new()) == NULL)
 283                                         {
 284                                         ret= -1;
 285                                         goto end;
 286                                         }
 287                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 288                                         {
 289                                         ret= -1;
 290                                         goto end;
 291                                         }
 292                                 s->init_buf=buf;
 293                                 }
 294
 295                         if (!ssl3_setup_buffers(s))
 296                                 {
 297                                 ret= -1;
 298                                 goto end;
 299                                 }
 300
 301                         s->init_num=0;
 302                         s->s3->flags &= ~SSL3_FLAGS_SGC_RESTART_DONE;
 303                         s->s3->flags &= ~TLS1_FLAGS_SKIP_CERT_VERIFY;
 304                         s->s3->flags &= ~SSL3_FLAGS_CCS_OK;
 305                         /* Should have been reset by ssl3_get_finished, too. */
 306                         s->s3->change_cipher_spec = 0;
 307
 308                         if (s->state != SSL_ST_RENEGOTIATE)
 309                                 {
 310                                 /* Ok, we now need to push on a buffering BIO so that
 311                                  * the output is sent in a way that TCP likes :-)
 312                                  */
 313                                 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
 314
 315                                 ssl3_init_finished_mac(s);
 316                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
 317                                 s->ctx->stats.sess_accept++;
 318                                 }
 319                         else if (!s->s3->send_connection_binding &&
 320                                 !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
 321                                 {
 322                                 /* Server attempting to renegotiate with
 323                                  * client that doesn't support secure
 324                                  * renegotiation.
 325                                  */
 326                                 SSLerr(SSL_F_SSL3_ACCEPT, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
 327                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
 328                                 ret = -1;
 329                                 goto end;
 330                                 }
 331                         else
 332                                 {
 333                                 /* s->state == SSL_ST_RENEGOTIATE,
 334                                  * we will just send a HelloRequest */
 335                                 s->ctx->stats.sess_accept_renegotiate++;
 336                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
 337                                 }
 338                         break;
 339
 340                 case SSL3_ST_SW_HELLO_REQ_A:
 341                 case SSL3_ST_SW_HELLO_REQ_B:
 342
 343                         s->shutdown=0;
 344                         ret=ssl3_send_hello_request(s);
 345                         if (ret <= 0) goto end;
 346                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
 347                         s->state=SSL3_ST_SW_FLUSH;
 348                         s->init_num=0;
 349
 350                         ssl3_init_finished_mac(s);
 351                         break;
 352
 353                 case SSL3_ST_SW_HELLO_REQ_C:
 354                         s->state=SSL_ST_OK;
 355                         break;
 356
 357                 case SSL3_ST_SR_CLNT_HELLO_A:
 358                 case SSL3_ST_SR_CLNT_HELLO_B:
 359                 case SSL3_ST_SR_CLNT_HELLO_C:
 360
 361                         s->shutdown=0;
 362                         ret=ssl3_get_client_hello(s);
 363                         if (ret <= 0) goto end;
 364 #ifndef OPENSSL_NO_SRP
 365                         s->state = SSL3_ST_SR_CLNT_HELLO_D;
 366                 case SSL3_ST_SR_CLNT_HELLO_D:
 367                         {
 368                         int al;
 369                         if ((ret = ssl_check_srp_ext_ClientHello(s,&al))  < 0)
 370                                         {
 371                                         /* callback indicates firther work to be done */
 372                                         s->rwstate=SSL_X509_LOOKUP;
 373                                         goto end;
 374                                         }
 375                         if (ret != SSL_ERROR_NONE)
 376                                 {
 377                                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
 378                                 /* This is not really an error but the only means to
 379                                    for a client to detect whether srp is supported. */
 380                                    if (al != TLS1_AD_UNKNOWN_PSK_IDENTITY)
 381                                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_CLIENTHELLO_TLSEXT);
 382                                 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
 383                                 ret= -1;
 384                                 goto end;
 385                                 }
 386                         }
 387 #endif
 388
 389                         s->renegotiate = 2;
 390                         s->state=SSL3_ST_SW_SRVR_HELLO_A;
 391                         s->init_num=0;
 392                         break;
 393
 394                 case SSL3_ST_SW_SRVR_HELLO_A:
 395                 case SSL3_ST_SW_SRVR_HELLO_B:
 396                         ret=ssl3_send_server_hello(s);
 397                         if (ret <= 0) goto end;
 398 #ifndef OPENSSL_NO_TLSEXT
 399                         if (s->hit)
 400                                 {
 401                                 if (s->tlsext_ticket_expected)
 402                                         s->state=SSL3_ST_SW_SESSION_TICKET_A;
 403                                 else
 404                                         s->state=SSL3_ST_SW_CHANGE_A;
 405                                 }
 406 #else
 407                         if (s->hit)
 408                                         s->state=SSL3_ST_SW_CHANGE_A;
 409 #endif
 410                         else
 411                                         s->state = SSL3_ST_SW_CERT_A;
 412                         s->init_num = 0;
 413                         break;
 414
 415                 case SSL3_ST_SW_CERT_A:
 416                 case SSL3_ST_SW_CERT_B:
 417                         /* Check if it is anon DH or anon ECDH, */
 418                         /* normal PSK or KRB5 or SRP */
 419                         if (!(s->s3->tmp.new_cipher->algorithm_auth & (SSL_aNULL|SSL_aKRB5|SSL_aSRP))
 420                                 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 421                                 {
 422                                 ret=ssl3_send_server_certificate(s);
 423                                 if (ret <= 0) goto end;
 424 #ifndef OPENSSL_NO_TLSEXT
 425                                 if (s->tlsext_status_expected)
 426                                         s->state=SSL3_ST_SW_CERT_STATUS_A;
 427                                 else
 428                                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 429                                 }
 430                         else
 431                                 {
 432                                 skip = 1;
 433                                 s->state=SSL3_ST_SW_KEY_EXCH_A;
 434                                 }
 435 #else
 436                                 }
 437                         else
 438                                 skip=1;
 439
 440                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 441 #endif
 442                         s->init_num=0;
 443                         break;
 444
 445                 case SSL3_ST_SW_KEY_EXCH_A:
 446                 case SSL3_ST_SW_KEY_EXCH_B:
 447                         alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
 448
 449                         /* clear this, it may get reset by
 450                          * send_server_key_exchange */
 451                         if ((s->options & SSL_OP_EPHEMERAL_RSA)
 452 #ifndef OPENSSL_NO_KRB5
 453                                 && !(alg_k & SSL_kKRB5)
 454 #endif /* OPENSSL_NO_KRB5 */
 455                                 )
 456                                 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
 457                                  * even when forbidden by protocol specs
 458                                  * (handshake may fail as clients are not required to
 459                                  * be able to handle this) */
 460                                 s->s3->tmp.use_rsa_tmp=1;
 461                         else
 462                                 s->s3->tmp.use_rsa_tmp=0;
 463
 464
 465                         /* only send if a DH key exchange, fortezza or
 466                          * RSA but we have a sign only certificate
 467                          *
 468                          * PSK: may send PSK identity hints
 469                          *
 470                          * For ECC ciphersuites, we send a serverKeyExchange
 471                          * message only if the cipher suite is either
 472                          * ECDH-anon or ECDHE. In other cases, the
 473                          * server certificate contains the server's
 474                          * public key for key exchange.
 475                          */
 476                         if (s->s3->tmp.use_rsa_tmp
 477                         /* PSK: send ServerKeyExchange if PSK identity
 478                          * hint if provided */
 479 #ifndef OPENSSL_NO_PSK
 480                             || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
 481 #endif
 482 #ifndef OPENSSL_NO_SRP
 483                             /* SRP: send ServerKeyExchange */
 484                             || (alg_k & SSL_kSRP)
 485 #endif
 486                             || (alg_k & SSL_kEDH)
 487                             || (alg_k & SSL_kEECDH)
 488                             || ((alg_k & SSL_kRSA)
 489                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
 490                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
 491                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
 492                                         )
 493                                     )
 494                                 )
 495                             )
 496                                 {
 497                                 ret=ssl3_send_server_key_exchange(s);
 498                                 if (ret <= 0) goto end;
 499                                 }
 500                         else
 501                                 skip=1;
 502
 503                         s->state=SSL3_ST_SW_CERT_REQ_A;
 504                         s->init_num=0;
 505                         break;
 506
 507                 case SSL3_ST_SW_CERT_REQ_A:
 508                 case SSL3_ST_SW_CERT_REQ_B:
 509                         if (/* don't request cert unless asked for it: */
 510                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
 511                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
 512                                  * don't request cert during re-negotiation: */
 513                                 ((s->session->peer != NULL) &&
 514                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
 515                                 /* never request cert in anonymous ciphersuites
 516                                  * (see section "Certificate request" in SSL 3 drafts
 517                                  * and in RFC 2246): */
 518                                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
 519                                  /* ... except when the application insists on verification
 520                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
 521                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
 522                                  /* never request cert in Kerberos ciphersuites */
 523                                 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5) ||
 524                                 /* don't request certificate for SRP auth */
 525                                 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aSRP)
 526                                 /* With normal PSK Certificates and
 527                                  * Certificate Requests are omitted */
 528                                 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 529                                 {
 530                                 /* no cert request */
 531                                 skip=1;
 532                                 s->s3->tmp.cert_request=0;
 533                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 534                                 if (s->s3->handshake_buffer)
 535                                         if (!ssl3_digest_cached_records(s))
 536                                                 return -1;
 537                                 }
 538                         else
 539                                 {
 540                                 s->s3->tmp.cert_request=1;
 541                                 ret=ssl3_send_certificate_request(s);
 542                                 if (ret <= 0) goto end;
 543 #ifndef NETSCAPE_HANG_BUG
 544                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 545 #else
 546                                 s->state=SSL3_ST_SW_FLUSH;
 547                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 548 #endif
 549                                 s->init_num=0;
 550                                 }
 551                         break;
 552
 553                 case SSL3_ST_SW_SRVR_DONE_A:
 554                 case SSL3_ST_SW_SRVR_DONE_B:
 555                         ret=ssl3_send_server_done(s);
 556                         if (ret <= 0) goto end;
 557                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 558                         s->state=SSL3_ST_SW_FLUSH;
 559                         s->init_num=0;
 560                         break;
 561
 562                 case SSL3_ST_SW_FLUSH:
 563
 564                         /* This code originally checked to see if
 565                          * any data was pending using BIO_CTRL_INFO
 566                          * and then flushed. This caused problems
 567                          * as documented in PR#1939. The proposed
 568                          * fix doesn't completely resolve this issue
 569                          * as buggy implementations of BIO_CTRL_PENDING
 570                          * still exist. So instead we just flush
 571                          * unconditionally.
 572                          */
 573
 574                         s->rwstate=SSL_WRITING;
 575                         if (BIO_flush(s->wbio) <= 0)
 576                                 {
 577                                 ret= -1;
 578                                 goto end;
 579                                 }
 580                         s->rwstate=SSL_NOTHING;
 581
 582                         s->state=s->s3->tmp.next_state;
 583                         break;
 584
 585                 case SSL3_ST_SR_CERT_A:
 586                 case SSL3_ST_SR_CERT_B:
 587                         /* Check for second client hello (MS SGC) */
 588                         ret = ssl3_check_client_hello(s);
 589                         if (ret <= 0)
 590                                 goto end;
 591                         if (ret == 2)
 592                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
 593                         else {
 594                                 if (s->s3->tmp.cert_request)
 595                                         {
 596                                         ret=ssl3_get_client_certificate(s);
 597                                         if (ret <= 0) goto end;
 598                                         }
 599                                 s->init_num=0;
 600                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
 601                         }
 602                         break;
 603
 604                 case SSL3_ST_SR_KEY_EXCH_A:
 605                 case SSL3_ST_SR_KEY_EXCH_B:
 606                         ret=ssl3_get_client_key_exchange(s);
 607                         if (ret <= 0)
 608                                 goto end;
 609                         if (ret == 2)
 610                                 {
 611                                 /* For the ECDH ciphersuites when
 612                                  * the client sends its ECDH pub key in
 613                                  * a certificate, the CertificateVerify
 614                                  * message is not sent.
 615                                  * Also for GOST ciphersuites when
 616                                  * the client uses its key from the certificate
 617                                  * for key exchange.
 618                                  */
 619 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
 620                                 s->state=SSL3_ST_SR_FINISHED_A;
 621 #else
 622                                 if (s->s3->next_proto_neg_seen)
 623                                         s->state=SSL3_ST_SR_NEXT_PROTO_A;
 624                                 else
 625                                         s->state=SSL3_ST_SR_FINISHED_A;
 626 #endif
 627                                 s->init_num = 0;
 628                                 }
 629                         else if (SSL_USE_SIGALGS(s))
 630                                 {
 631                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
 632                                 s->init_num=0;
 633                                 if (!s->session->peer)
 634                                         break;
 635                                 /* For sigalgs freeze the handshake buffer
 636                                  * at this point and digest cached records.
 637                                  */
 638                                 if (!s->s3->handshake_buffer)
 639                                         {
 640                                         SSLerr(SSL_F_SSL3_ACCEPT,ERR_R_INTERNAL_ERROR);
 641                                         return -1;
 642                                         }
 643                                 s->s3->flags |= TLS1_FLAGS_KEEP_HANDSHAKE;
 644                                 if (!ssl3_digest_cached_records(s))
 645                                         return -1;
 646                                 }
 647                         else
 648                                 {
 649                                 int offset=0;
 650                                 int dgst_num;
 651
 652                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
 653                                 s->init_num=0;
 654
 655                                 /* We need to get hashes here so if there is
 656                                  * a client cert, it can be verified
 657                                  * FIXME - digest processing for CertificateVerify
 658                                  * should be generalized. But it is next step
 659                                  */
 660                                 if (s->s3->handshake_buffer)
 661                                         if (!ssl3_digest_cached_records(s))
 662                                                 return -1;
 663                                 for (dgst_num=0; dgst_num<SSL_MAX_DIGEST;dgst_num++)
 664                                         if (s->s3->handshake_dgst[dgst_num])
 665                                                 {
 666                                                 int dgst_size;
 667
 668                                                 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]));
 669                                                 dgst_size=EVP_MD_CTX_size(s->s3->handshake_dgst[dgst_num]);
 670                                                 if (dgst_size < 0)
 671                                                         {
 672                                                         ret = -1;
 673                                                         goto end;
 674                                                         }
 675                                                 offset+=dgst_size;
 676                                                 }
 677                                 }
 678                         break;
 679
 680                 case SSL3_ST_SR_CERT_VRFY_A:
 681                 case SSL3_ST_SR_CERT_VRFY_B:
 682                         /*
 683                          * This *should* be the first time we enable CCS, but be
 684                          * extra careful about surrounding code changes. We need
 685                          * to set this here because we don't know if we're
 686                          * expecting a CertificateVerify or not.
 687                          */
 688                         if (!s->s3->change_cipher_spec)
 689                                 s->s3->flags |= SSL3_FLAGS_CCS_OK;
 690                         /* we should decide if we expected this one */
 691                         ret=ssl3_get_cert_verify(s);
 692                         if (ret <= 0) goto end;
 693
 694 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
 695                         s->state=SSL3_ST_SR_FINISHED_A;
 696 #else
 697                         if (s->s3->next_proto_neg_seen)
 698                                 s->state=SSL3_ST_SR_NEXT_PROTO_A;
 699                         else
 700                                 s->state=SSL3_ST_SR_FINISHED_A;
 701 #endif
 702                         s->init_num=0;
 703                         break;
 704
 705 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
 706                 case SSL3_ST_SR_NEXT_PROTO_A:
 707                 case SSL3_ST_SR_NEXT_PROTO_B:
 708                         /*
 709                          * Enable CCS for resumed handshakes with NPN.
 710                          * In a full handshake with NPN, we end up here through
 711                          * SSL3_ST_SR_CERT_VRFY_B, where SSL3_FLAGS_CCS_OK was
 712                          * already set. Receiving a CCS clears the flag, so make
 713                          * sure not to re-enable it to ban duplicates.
 714                          * s->s3->change_cipher_spec is set when a CCS is
 715                          * processed in s3_pkt.c, and remains set until
 716                          * the client's Finished message is read.
 717                          */
 718                         if (!s->s3->change_cipher_spec)
 719                                 s->s3->flags |= SSL3_FLAGS_CCS_OK;
 720
 721                         ret=ssl3_get_next_proto(s);
 722                         if (ret <= 0) goto end;
 723                         s->init_num = 0;
 724                         s->state=SSL3_ST_SR_FINISHED_A;
 725                         break;
 726 #endif
 727
 728                 case SSL3_ST_SR_FINISHED_A:
 729                 case SSL3_ST_SR_FINISHED_B:
 730                         /*
 731                          * Enable CCS for resumed handshakes without NPN.
 732                          * In a full handshake, we end up here through
 733                          * SSL3_ST_SR_CERT_VRFY_B, where SSL3_FLAGS_CCS_OK was
 734                          * already set. Receiving a CCS clears the flag, so make
 735                          * sure not to re-enable it to ban duplicates.
 736                          * s->s3->change_cipher_spec is set when a CCS is
 737                          * processed in s3_pkt.c, and remains set until
 738                          * the client's Finished message is read.
 739                          */
 740                         if (!s->s3->change_cipher_spec)
 741                                 s->s3->flags |= SSL3_FLAGS_CCS_OK;
 742                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
 743                                 SSL3_ST_SR_FINISHED_B);
 744                         if (ret <= 0) goto end;
 745                         if (s->hit)
 746                                 s->state=SSL_ST_OK;
 747 #ifndef OPENSSL_NO_TLSEXT
 748                         else if (s->tlsext_ticket_expected)
 749                                 s->state=SSL3_ST_SW_SESSION_TICKET_A;
 750 #endif
 751                         else
 752                                 s->state=SSL3_ST_SW_CHANGE_A;
 753                         s->init_num=0;
 754                         break;
 755
 756 #ifndef OPENSSL_NO_TLSEXT
 757                 case SSL3_ST_SW_SESSION_TICKET_A:
 758                 case SSL3_ST_SW_SESSION_TICKET_B:
 759                         ret=ssl3_send_newsession_ticket(s);
 760                         if (ret <= 0) goto end;
 761                         s->state=SSL3_ST_SW_CHANGE_A;
 762                         s->init_num=0;
 763                         break;
 764
 765                 case SSL3_ST_SW_CERT_STATUS_A:
 766                 case SSL3_ST_SW_CERT_STATUS_B:
 767                         ret=ssl3_send_cert_status(s);
 768                         if (ret <= 0) goto end;
 769                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 770                         s->init_num=0;
 771                         break;
 772
 773 #endif
 774
 775                 case SSL3_ST_SW_CHANGE_A:
 776                 case SSL3_ST_SW_CHANGE_B:
 777
 778                         s->session->cipher=s->s3->tmp.new_cipher;
 779                         if (!s->method->ssl3_enc->setup_key_block(s))
 780                                 { ret= -1; goto end; }
 781
 782                         ret=ssl3_send_change_cipher_spec(s,
 783                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
 784
 785                         if (ret <= 0) goto end;
 786                         s->state=SSL3_ST_SW_FINISHED_A;
 787                         s->init_num=0;
 788
 789                         if (!s->method->ssl3_enc->change_cipher_state(s,
 790                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
 791                                 {
 792                                 ret= -1;
 793                                 goto end;
 794                                 }
 795
 796                         break;
 797
 798                 case SSL3_ST_SW_FINISHED_A:
 799                 case SSL3_ST_SW_FINISHED_B:
 800                         ret=ssl3_send_finished(s,
 801                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
 802                                 s->method->ssl3_enc->server_finished_label,
 803                                 s->method->ssl3_enc->server_finished_label_len);
 804                         if (ret <= 0) goto end;
 805                         s->state=SSL3_ST_SW_FLUSH;
 806                         if (s->hit)
 807                                 {
 808 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
 809                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 810 #else
 811                                 if (s->s3->next_proto_neg_seen)
 812                                         {
 813                                         s->s3->tmp.next_state=SSL3_ST_SR_NEXT_PROTO_A;
 814                                         }
 815                                 else
 816                                         s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 817 #endif
 818                                 }
 819                         else
 820                                 s->s3->tmp.next_state=SSL_ST_OK;
 821                         s->init_num=0;
 822                         break;
 823
 824                 case SSL_ST_OK:
 825                         /* clean a few things up */
 826                         ssl3_cleanup_key_block(s);
 827
 828                         BUF_MEM_free(s->init_buf);
 829                         s->init_buf=NULL;
 830
 831                         /* remove buffering on output */
 832                         ssl_free_wbio_buffer(s);
 833
 834                         s->init_num=0;
 835
 836                         if (s->renegotiate == 2) /* skipped if we just sent a HelloRequest */
 837                                 {
 838                                 s->renegotiate=0;
 839                                 s->new_session=0;
 840
 841                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 842
 843                                 s->ctx->stats.sess_accept_good++;
 844                                 /* s->server=1; */
 845                                 s->handshake_func=ssl3_accept;
 846
 847                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 848                                 }
 849
 850                         ret = 1;
 851                         goto end;
 852                         /* break; */
 853
 854                 default:
 855                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
 856                         ret= -1;
 857                         goto end;
 858                         /* break; */
 859                         }
 860
 861                 if (!s->s3->tmp.reuse_message && !skip)
 862                         {
 863                         if (s->debug)
 864                                 {
 865                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 866                                         goto end;
 867                                 }
 868
 869
 870                         if ((cb != NULL) && (s->state != state))
 871                                 {
 872                                 new_state=s->state;
 873                                 s->state=state;
 874                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
 875                                 s->state=new_state;
 876                                 }
 877                         }
 878                 skip=0;
 879                 }
 880 end:
 881         /* BIO_flush(s->wbio); */
 882
 883         s->in_handshake--;
 884         if (cb != NULL)
 885                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 886         return(ret);
 887         }
 888
 889 int ssl3_send_hello_request(SSL *s)
 890         {
 891
 892         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
 893                 {
 894                 ssl_set_handshake_header(s, SSL3_MT_HELLO_REQUEST, 0);
 895                 s->state=SSL3_ST_SW_HELLO_REQ_B;
 896                 }
 897
 898         /* SSL3_ST_SW_HELLO_REQ_B */
 899         return ssl_do_write(s);
 900         }
 901
 902 int ssl3_check_client_hello(SSL *s)
 903         {
 904         int ok;
 905         long n;
 906
 907         /* this function is called when we really expect a Certificate message,
 908          * so permit appropriate message length */
 909         n=s->method->ssl_get_message(s,
 910                 SSL3_ST_SR_CERT_A,
 911                 SSL3_ST_SR_CERT_B,
 912                 -1,
 913                 s->max_cert_list,
 914                 &ok);
 915         if (!ok) return((int)n);
 916         s->s3->tmp.reuse_message = 1;
 917         if (s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO)
 918                 {
 919                 /* We only allow the client to restart the handshake once per
 920                  * negotiation. */
 921                 if (s->s3->flags & SSL3_FLAGS_SGC_RESTART_DONE)
 922                         {
 923                         SSLerr(SSL_F_SSL3_CHECK_CLIENT_HELLO, SSL_R_MULTIPLE_SGC_RESTARTS);
 924                         return -1;
 925                         }
 926                 /* Throw away what we have done so far in the current handshake,
 927                  * which will now be aborted. (A full SSL_clear would be too much.) */
 928 #ifndef OPENSSL_NO_DH
 929                 if (s->s3->tmp.dh != NULL)
 930                         {
 931                         DH_free(s->s3->tmp.dh);
 932                         s->s3->tmp.dh = NULL;
 933                         }
 934 #endif
 935 #ifndef OPENSSL_NO_ECDH
 936                 if (s->s3->tmp.ecdh != NULL)
 937                         {
 938                         EC_KEY_free(s->s3->tmp.ecdh);
 939                         s->s3->tmp.ecdh = NULL;
 940                         }
 941 #endif
 942                 s->s3->flags |= SSL3_FLAGS_SGC_RESTART_DONE;
 943                 return 2;
 944                 }
 945         return 1;
 946 }
 947
 948 int ssl3_get_client_hello(SSL *s)
 949         {
 950         int i,j,ok,al=SSL_AD_INTERNAL_ERROR,ret= -1;
 951         unsigned int cookie_len;
 952         long n;
 953         unsigned long id;
 954         unsigned char *p,*d;
 955         SSL_CIPHER *c;
 956 #ifndef OPENSSL_NO_COMP
 957         unsigned char *q;
 958         SSL_COMP *comp=NULL;
 959 #endif
 960         STACK_OF(SSL_CIPHER) *ciphers=NULL;
 961
 962         if (s->state == SSL3_ST_SR_CLNT_HELLO_C && !s->first_packet)
 963                 goto retry_cert;
 964
 965         /* We do this so that we will respond with our native type.
 966          * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
 967          * This down switching should be handled by a different method.
 968          * If we are SSLv3, we will respond with SSLv3, even if prompted with
 969          * TLSv1.
 970          */
 971         if (s->state == SSL3_ST_SR_CLNT_HELLO_A
 972                 )
 973                 {
 974                 s->state=SSL3_ST_SR_CLNT_HELLO_B;
 975                 }
 976         s->first_packet=1;
 977         n=s->method->ssl_get_message(s,
 978                 SSL3_ST_SR_CLNT_HELLO_B,
 979                 SSL3_ST_SR_CLNT_HELLO_C,
 980                 SSL3_MT_CLIENT_HELLO,
 981                 SSL3_RT_MAX_PLAIN_LENGTH,
 982                 &ok);
 983
 984         if (!ok) return((int)n);
 985         s->first_packet=0;
 986         d=p=(unsigned char *)s->init_msg;
 987
 988         /* use version from inside client hello, not from record header
 989          * (may differ: see RFC 2246, Appendix E, second paragraph) */
 990         s->client_version=(((int)p[0])<<8)|(int)p[1];
 991         p+=2;
 992
 993         if (SSL_IS_DTLS(s)  ?   (s->client_version > s->version &&
 994                                  s->method->version != DTLS_ANY_VERSION)
 995                             :   (s->client_version < s->version))
 996                 {
 997                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER);
 998                 if ((s->client_version>>8) == SSL3_VERSION_MAJOR &&
 999                         !s->enc_write_ctx && !s->write_hash)
1000                         {
1001                         /* similar to ssl3_get_record, send alert using remote version number */
1002                         s->version = s->client_version;
1003                         }
1004                 al = SSL_AD_PROTOCOL_VERSION;
1005                 goto f_err;
1006                 }
1007
1008         /* If we require cookies and this ClientHello doesn't
1009          * contain one, just return since we do not want to
1010          * allocate any memory yet. So check cookie length...
1011          */
1012         if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)
1013                 {
1014                 unsigned int session_length, cookie_length;
1015
1016                 session_length = *(p + SSL3_RANDOM_SIZE);
1017                 cookie_length = *(p + SSL3_RANDOM_SIZE + session_length + 1);
1018
1019                 if (cookie_length == 0)
1020                         return 1;
1021                 }
1022
1023         /* load the client random */
1024         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
1025         p+=SSL3_RANDOM_SIZE;
1026
1027         /* get the session-id */
1028         j= *(p++);
1029
1030         s->hit=0;
1031         /* Versions before 0.9.7 always allow clients to resume sessions in renegotiation.
1032          * 0.9.7 and later allow this by default, but optionally ignore resumption requests
1033          * with flag SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION (it's a new flag rather
1034          * than a change to default behavior so that applications relying on this for security
1035          * won't even compile against older library versions).
1036          *
1037          * 1.0.1 and later also have a function SSL_renegotiate_abbreviated() to request
1038          * renegotiation but not a new session (s->new_session remains unset): for servers,
1039          * this essentially just means that the SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
1040          * setting will be ignored.
1041          */
1042         if ((s->new_session && (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION)))
1043                 {
1044                 if (!ssl_get_new_session(s,1))
1045                         goto err;
1046                 }
1047         else
1048                 {
1049                 i=ssl_get_prev_session(s, p, j, d + n);
1050                 if (i == 1)
1051                         { /* previous session */
1052                         s->hit=1;
1053                         }
1054                 else if (i == -1)
1055                         goto err;
1056                 else /* i == 0 */
1057                         {
1058                         if (!ssl_get_new_session(s,1))
1059                                 goto err;
1060                         }
1061                 }
1062
1063         p+=j;
1064
1065         if (SSL_IS_DTLS(s))
1066                 {
1067                 /* cookie stuff */
1068                 cookie_len = *(p++);
1069
1070                 /*
1071                  * The ClientHello may contain a cookie even if the
1072                  * HelloVerify message has not been sent--make sure that it
1073                  * does not cause an overflow.
1074                  */
1075                 if ( cookie_len > sizeof(s->d1->rcvd_cookie))
1076                         {
1077                         /* too much data */
1078                         al = SSL_AD_DECODE_ERROR;
1079                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
1080                         goto f_err;
1081                         }
1082
1083                 /* verify the cookie if appropriate option is set. */
1084                 if ((SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) &&
1085                         cookie_len > 0)
1086                         {
1087                         memcpy(s->d1->rcvd_cookie, p, cookie_len);
1088
1089                         if ( s->ctx->app_verify_cookie_cb != NULL)
1090                                 {
1091                                 if ( s->ctx->app_verify_cookie_cb(s, s->d1->rcvd_cookie,
1092                                         cookie_len) == 0)
1093                                         {
1094                                         al=SSL_AD_HANDSHAKE_FAILURE;
1095                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
1096                                                 SSL_R_COOKIE_MISMATCH);
1097                                         goto f_err;
1098                                         }
1099                                 /* else cookie verification succeeded */
1100                                 }
1101                         else if ( memcmp(s->d1->rcvd_cookie, s->d1->cookie,
1102                                                   s->d1->cookie_len) != 0) /* default verification */
1103                                 {
1104                                         al=SSL_AD_HANDSHAKE_FAILURE;
1105                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
1106                                                 SSL_R_COOKIE_MISMATCH);
1107                                         goto f_err;
1108                                 }
1109                         /* Set to -2 so if successful we return 2 */
1110                         ret = -2;
1111                         }
1112
1113                 p += cookie_len;
1114                 if (s->method->version == DTLS_ANY_VERSION)
1115                         {
1116                         /* Select version to use */
1117                         if (s->client_version <= DTLS1_2_VERSION &&
1118                                 !(s->options & SSL_OP_NO_DTLSv1_2))
1119                                 {
1120                                 s->version = DTLS1_2_VERSION;
1121                                 s->method = DTLSv1_2_server_method();
1122                                 }
1123                         else if (tls1_suiteb(s))
1124                                 {
1125                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_ONLY_DTLS_1_2_ALLOWED_IN_SUITEB_MODE);
1126                                 s->version = s->client_version;
1127                                 al = SSL_AD_PROTOCOL_VERSION;
1128                                 goto f_err;
1129                                 }
1130                         else if (s->client_version <= DTLS1_VERSION &&
1131                                 !(s->options & SSL_OP_NO_DTLSv1))
1132                                 {
1133                                 s->version = DTLS1_VERSION;
1134                                 s->method = DTLSv1_server_method();
1135                                 }
1136                         else
1137                                 {
1138                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER);
1139                                 s->version = s->client_version;
1140                                 al = SSL_AD_PROTOCOL_VERSION;
1141                                 goto f_err;
1142                                 }
1143                         s->session->ssl_version = s->version;
1144                         }
1145                 }
1146
1147         n2s(p,i);
1148         if ((i == 0) && (j != 0))
1149                 {
1150                 /* we need a cipher if we are not resuming a session */
1151                 al=SSL_AD_ILLEGAL_PARAMETER;
1152                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
1153                 goto f_err;
1154                 }
1155         if ((p+i) >= (d+n))
1156                 {
1157                 /* not enough data */
1158                 al=SSL_AD_DECODE_ERROR;
1159                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
1160                 goto f_err;
1161                 }
1162         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
1163                 == NULL))
1164                 {
1165                 goto err;
1166                 }
1167         p+=i;
1168
1169         /* If it is a hit, check that the cipher is in the list */
1170         if ((s->hit) && (i > 0))
1171                 {
1172                 j=0;
1173                 id=s->session->cipher->id;
1174
1175 #ifdef CIPHER_DEBUG
1176                 printf("client sent %d ciphers\n",sk_num(ciphers));
1177 #endif
1178                 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
1179                         {
1180                         c=sk_SSL_CIPHER_value(ciphers,i);
1181 #ifdef CIPHER_DEBUG
1182                         printf("client [%2d of %2d]:%s\n",
1183                                 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
1184 #endif
1185                         if (c->id == id)
1186                                 {
1187                                 j=1;
1188                                 break;
1189                                 }
1190                         }
1191 /* Disabled because it can be used in a ciphersuite downgrade
1192  * attack: CVE-2010-4180.
1193  */
1194 #if 0
1195                 if (j == 0 && (s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
1196                         {
1197                         /* Special case as client bug workaround: the previously used cipher may
1198                          * not be in the current list, the client instead might be trying to
1199                          * continue using a cipher that before wasn't chosen due to server
1200                          * preferences.  We'll have to reject the connection if the cipher is not
1201                          * enabled, though. */
1202                         c = sk_SSL_CIPHER_value(ciphers, 0);
1203                         if (sk_SSL_CIPHER_find(SSL_get_ciphers(s), c) >= 0)
1204                                 {
1205                                 s->session->cipher = c;
1206                                 j = 1;
1207                                 }
1208                         }
1209 #endif
1210                 if (j == 0)
1211                         {
1212                         /* we need to have the cipher in the cipher
1213                          * list if we are asked to reuse it */
1214                         al=SSL_AD_ILLEGAL_PARAMETER;
1215                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
1216                         goto f_err;
1217                         }
1218                 }
1219
1220         /* compression */
1221         i= *(p++);
1222         if ((p+i) > (d+n))
1223                 {
1224                 /* not enough data */
1225                 al=SSL_AD_DECODE_ERROR;
1226                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
1227                 goto f_err;
1228                 }
1229 #ifndef OPENSSL_NO_COMP
1230         q=p;
1231 #endif
1232         for (j=0; j<i; j++)
1233                 {
1234                 if (p[j] == 0) break;
1235                 }
1236
1237         p+=i;
1238         if (j >= i)
1239                 {
1240                 /* no compress */
1241                 al=SSL_AD_DECODE_ERROR;
1242                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
1243                 goto f_err;
1244                 }
1245
1246 #ifndef OPENSSL_NO_TLSEXT
1247         /* TLS extensions*/
1248         if (s->version >= SSL3_VERSION)
1249                 {
1250                 if (!ssl_parse_clienthello_tlsext(s,&p,d,n))
1251                         {
1252                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_PARSE_TLSEXT);
1253                         goto err;
1254                         }
1255                 }
1256
1257         /* Check if we want to use external pre-shared secret for this
1258          * handshake for not reused session only. We need to generate
1259          * server_random before calling tls_session_secret_cb in order to allow
1260          * SessionTicket processing to use it in key derivation. */
1261         {
1262                 unsigned char *pos;
1263                 pos=s->s3->server_random;
1264                 if (ssl_fill_hello_random(s, 1, pos, SSL3_RANDOM_SIZE) <= 0)
1265                         {
1266                         goto f_err;
1267                         }
1268         }
1269
1270         if (!s->hit && s->version >= TLS1_VERSION && s->tls_session_secret_cb)
1271                 {
1272                 SSL_CIPHER *pref_cipher=NULL;
1273
1274                 s->session->master_key_length=sizeof(s->session->master_key);
1275                 if(s->tls_session_secret_cb(s, s->session->master_key, &s->session->master_key_length,
1276                         ciphers, &pref_cipher, s->tls_session_secret_cb_arg))
1277                         {
1278                         s->hit=1;
1279                         s->session->ciphers=ciphers;
1280                         s->session->verify_result=X509_V_OK;
1281
1282                         ciphers=NULL;
1283
1284                         /* check if some cipher was preferred by call back */
1285                         pref_cipher=pref_cipher ? pref_cipher : ssl3_choose_cipher(s, s->session->ciphers, SSL_get_ciphers(s));
1286                         if (pref_cipher == NULL)
1287                                 {
1288                                 al=SSL_AD_HANDSHAKE_FAILURE;
1289                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1290                                 goto f_err;
1291                                 }
1292
1293                         s->session->cipher=pref_cipher;
1294
1295                         if (s->cipher_list)
1296                                 sk_SSL_CIPHER_free(s->cipher_list);
1297
1298                         if (s->cipher_list_by_id)
1299                                 sk_SSL_CIPHER_free(s->cipher_list_by_id);
1300
1301                         s->cipher_list = sk_SSL_CIPHER_dup(s->session->ciphers);
1302                         s->cipher_list_by_id = sk_SSL_CIPHER_dup(s->session->ciphers);
1303                         }
1304                 }
1305 #endif
1306
1307         /* Worst case, we will use the NULL compression, but if we have other
1308          * options, we will now look for them.  We have i-1 compression
1309          * algorithms from the client, starting at q. */
1310         s->s3->tmp.new_compression=NULL;
1311 #ifndef OPENSSL_NO_COMP
1312         /* This only happens if we have a cache hit */
1313         if (s->session->compress_meth != 0)
1314                 {
1315                 int m, comp_id = s->session->compress_meth;
1316                 /* Perform sanity checks on resumed compression algorithm */
1317                 /* Can't disable compression */
1318                 if (s->options & SSL_OP_NO_COMPRESSION)
1319                         {
1320                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1321                         goto f_err;
1322                         }
1323                 /* Look for resumed compression method */
1324                 for (m = 0; m < sk_SSL_COMP_num(s->ctx->comp_methods); m++)
1325                         {
1326                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1327                         if (comp_id == comp->id)
1328                                 {
1329                                 s->s3->tmp.new_compression=comp;
1330                                 break;
1331                                 }
1332                         }
1333                 if (s->s3->tmp.new_compression == NULL)
1334                         {
1335                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INVALID_COMPRESSION_ALGORITHM);
1336                         goto f_err;
1337                         }
1338                 /* Look for resumed method in compression list */
1339                 for (m = 0; m < i; m++)
1340                         {
1341                         if (q[m] == comp_id)
1342                                 break;
1343                         }
1344                 if (m >= i)
1345                         {
1346                         al=SSL_AD_ILLEGAL_PARAMETER;
1347                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_COMPRESSSION_ALGORITHM_MISSING);
1348                         goto f_err;
1349                         }
1350                 }
1351         else if (s->hit)
1352                 comp = NULL;
1353         else if (!(s->options & SSL_OP_NO_COMPRESSION) && s->ctx->comp_methods)
1354                 { /* See if we have a match */
1355                 int m,nn,o,v,done=0;
1356
1357                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
1358                 for (m=0; m<nn; m++)
1359                         {
1360                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1361                         v=comp->id;
1362                         for (o=0; o<i; o++)
1363                                 {
1364                                 if (v == q[o])
1365                                         {
1366                                         done=1;
1367                                         break;
1368                                         }
1369                                 }
1370                         if (done) break;
1371                         }
1372                 if (done)
1373                         s->s3->tmp.new_compression=comp;
1374                 else
1375                         comp=NULL;
1376                 }
1377 #else
1378         /* If compression is disabled we'd better not try to resume a session
1379          * using compression.
1380          */
1381         if (s->session->compress_meth != 0)
1382                 {
1383                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1384                 goto f_err;
1385                 }
1386 #endif
1387
1388         /* Given s->session->ciphers and SSL_get_ciphers, we must
1389          * pick a cipher */
1390
1391         if (!s->hit)
1392                 {
1393 #ifdef OPENSSL_NO_COMP
1394                 s->session->compress_meth=0;
1395 #else
1396                 s->session->compress_meth=(comp == NULL)?0:comp->id;
1397 #endif
1398                 if (s->session->ciphers != NULL)
1399                         sk_SSL_CIPHER_free(s->session->ciphers);
1400                 s->session->ciphers=ciphers;
1401                 if (ciphers == NULL)
1402                         {
1403                         al=SSL_AD_ILLEGAL_PARAMETER;
1404                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
1405                         goto f_err;
1406                         }
1407                 ciphers=NULL;
1408                 if (!tls1_set_server_sigalgs(s))
1409                         {
1410                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT);
1411                         goto err;
1412                         }
1413                 /* Let cert callback update server certificates if required */
1414                 retry_cert:
1415                 if (s->cert->cert_cb)
1416                         {
1417                         int rv = s->cert->cert_cb(s, s->cert->cert_cb_arg);
1418                         if (rv == 0)
1419                                 {
1420                                 al=SSL_AD_INTERNAL_ERROR;
1421                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_CERT_CB_ERROR);
1422                                 goto f_err;
1423                                 }
1424                         if (rv < 0)
1425                                 {
1426                                 s->rwstate=SSL_X509_LOOKUP;
1427                                 return -1;
1428                                 }
1429                         s->rwstate = SSL_NOTHING;
1430                         }
1431                 c=ssl3_choose_cipher(s,s->session->ciphers,
1432                                      SSL_get_ciphers(s));
1433
1434                 if (c == NULL)
1435                         {
1436                         al=SSL_AD_HANDSHAKE_FAILURE;
1437                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1438                         goto f_err;
1439                         }
1440                 s->s3->tmp.new_cipher=c;
1441                 }
1442         else
1443                 {
1444                 /* Session-id reuse */
1445 #ifdef REUSE_CIPHER_BUG
1446                 STACK_OF(SSL_CIPHER) *sk;
1447                 SSL_CIPHER *nc=NULL;
1448                 SSL_CIPHER *ec=NULL;
1449
1450                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
1451                         {
1452                         sk=s->session->ciphers;
1453                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
1454                                 {
1455                                 c=sk_SSL_CIPHER_value(sk,i);
1456                                 if (c->algorithm_enc & SSL_eNULL)
1457                                         nc=c;
1458                                 if (SSL_C_IS_EXPORT(c))
1459                                         ec=c;
1460                                 }
1461                         if (nc != NULL)
1462                                 s->s3->tmp.new_cipher=nc;
1463                         else if (ec != NULL)
1464                                 s->s3->tmp.new_cipher=ec;
1465                         else
1466                                 s->s3->tmp.new_cipher=s->session->cipher;
1467                         }
1468                 else
1469 #endif
1470                 s->s3->tmp.new_cipher=s->session->cipher;
1471                 }
1472
1473         if (!SSL_USE_SIGALGS(s) || !(s->verify_mode & SSL_VERIFY_PEER))
1474                 {
1475                 if (!ssl3_digest_cached_records(s))
1476                         goto f_err;
1477                 }
1478
1479         /* we now have the following setup.
1480          * client_random
1481          * cipher_list          - our prefered list of ciphers
1482          * ciphers              - the clients prefered list of ciphers
1483          * compression          - basically ignored right now
1484          * ssl version is set   - sslv3
1485          * s->session           - The ssl session has been setup.
1486          * s->hit               - session reuse flag
1487          * s->tmp.new_cipher    - the new cipher to use.
1488          */
1489
1490         /* Handles TLS extensions that we couldn't check earlier */
1491         if (s->version >= SSL3_VERSION)
1492                 {
1493                 if (ssl_check_clienthello_tlsext_late(s) <= 0)
1494                         {
1495                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT);
1496                         goto err;
1497                         }
1498                 }
1499
1500         if (ret < 0) ret=-ret;
1501         if (0)
1502                 {
1503 f_err:
1504                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1505                 }
1506 err:
1507         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
1508         return ret < 0 ? -1 : ret;
1509         }
1510
1511 int ssl3_send_server_hello(SSL *s)
1512         {
1513         unsigned char *buf;
1514         unsigned char *p,*d;
1515         int i,sl;
1516         int al = 0;
1517         unsigned long l;
1518
1519         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
1520                 {
1521                 buf=(unsigned char *)s->init_buf->data;
1522 #ifdef OPENSSL_NO_TLSEXT
1523                 p=s->s3->server_random;
1524                 if (ssl_fill_hello_random(s, 1, p, SSL3_RANDOM_SIZE) <= 0)
1525                         return -1;
1526 #endif
1527                 /* Do the message type and length last */
1528                 d=p= ssl_handshake_start(s);
1529
1530                 *(p++)=s->version>>8;
1531                 *(p++)=s->version&0xff;
1532
1533                 /* Random stuff */
1534                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
1535                 p+=SSL3_RANDOM_SIZE;
1536
1537                 /* There are several cases for the session ID to send
1538                  * back in the server hello:
1539                  * - For session reuse from the session cache,
1540                  *   we send back the old session ID.
1541                  * - If stateless session reuse (using a session ticket)
1542                  *   is successful, we send back the client's "session ID"
1543                  *   (which doesn't actually identify the session).
1544                  * - If it is a new session, we send back the new
1545                  *   session ID.
1546                  * - However, if we want the new session to be single-use,
1547                  *   we send back a 0-length session ID.
1548                  * s->hit is non-zero in either case of session reuse,
1549                  * so the following won't overwrite an ID that we're supposed
1550                  * to send back.
1551                  */
1552                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)
1553                         && !s->hit)
1554                         s->session->session_id_length=0;
1555
1556                 sl=s->session->session_id_length;
1557                 if (sl > (int)sizeof(s->session->session_id))
1558                         {
1559                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1560                         return -1;
1561                         }
1562                 *(p++)=sl;
1563                 memcpy(p,s->session->session_id,sl);
1564                 p+=sl;
1565
1566                 /* put the cipher */
1567                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
1568                 p+=i;
1569
1570                 /* put the compression method */
1571 #ifdef OPENSSL_NO_COMP
1572                         *(p++)=0;
1573 #else
1574                 if (s->s3->tmp.new_compression == NULL)
1575                         *(p++)=0;
1576                 else
1577                         *(p++)=s->s3->tmp.new_compression->id;
1578 #endif
1579 #ifndef OPENSSL_NO_TLSEXT
1580                 if (ssl_prepare_serverhello_tlsext(s) <= 0)
1581                         {
1582                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
1583                         return -1;
1584                         }
1585                 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH, &al)) == NULL)
1586                         {
1587                         ssl3_send_alert(s, SSL3_AL_FATAL, al);
1588                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
1589                         return -1;
1590                         }
1591 #endif
1592                 /* do the header */
1593                 l=(p-d);
1594                 ssl_set_handshake_header(s, SSL3_MT_SERVER_HELLO, l);
1595                 s->state=SSL3_ST_SW_SRVR_HELLO_B;
1596                 }
1597
1598         /* SSL3_ST_SW_SRVR_HELLO_B */
1599         return ssl_do_write(s);
1600         }
1601
1602 int ssl3_send_server_done(SSL *s)
1603         {
1604
1605         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1606                 {
1607                 ssl_set_handshake_header(s, SSL3_MT_SERVER_DONE, 0);
1608                 s->state = SSL3_ST_SW_SRVR_DONE_B;
1609                 }
1610
1611         /* SSL3_ST_SW_SRVR_DONE_B */
1612         return ssl_do_write(s);
1613         }
1614
1615 int ssl3_send_server_key_exchange(SSL *s)
1616         {
1617 #ifndef OPENSSL_NO_RSA
1618         unsigned char *q;
1619         int j,num;
1620         RSA *rsa;
1621         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1622         unsigned int u;
1623 #endif
1624 #ifndef OPENSSL_NO_DH
1625         DH *dh=NULL,*dhp;
1626 #endif
1627 #ifndef OPENSSL_NO_ECDH
1628         EC_KEY *ecdh=NULL, *ecdhp;
1629         unsigned char *encodedPoint = NULL;
1630         int encodedlen = 0;
1631         int curve_id = 0;
1632         BN_CTX *bn_ctx = NULL;
1633 #endif
1634         EVP_PKEY *pkey;
1635         const EVP_MD *md = NULL;
1636         unsigned char *p,*d;
1637         int al,i;
1638         unsigned long type;
1639         int n;
1640         CERT *cert;
1641         BIGNUM *r[4];
1642         int nr[4],kn;
1643         BUF_MEM *buf;
1644         EVP_MD_CTX md_ctx;
1645
1646         EVP_MD_CTX_init(&md_ctx);
1647         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1648                 {
1649                 type=s->s3->tmp.new_cipher->algorithm_mkey;
1650                 cert=s->cert;
1651
1652                 buf=s->init_buf;
1653
1654                 r[0]=r[1]=r[2]=r[3]=NULL;
1655                 n=0;
1656 #ifndef OPENSSL_NO_RSA
1657                 if (type & SSL_kRSA)
1658                         {
1659                         rsa=cert->rsa_tmp;
1660                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1661                                 {
1662                                 rsa=s->cert->rsa_tmp_cb(s,
1663                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1664                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1665                                 if(rsa == NULL)
1666                                 {
1667                                         al=SSL_AD_HANDSHAKE_FAILURE;
1668                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1669                                         goto f_err;
1670                                 }
1671                                 RSA_up_ref(rsa);
1672                                 cert->rsa_tmp=rsa;
1673                                 }
1674                         if (rsa == NULL)
1675                                 {
1676                                 al=SSL_AD_HANDSHAKE_FAILURE;
1677                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1678                                 goto f_err;
1679                                 }
1680                         r[0]=rsa->n;
1681                         r[1]=rsa->e;
1682                         s->s3->tmp.use_rsa_tmp=1;
1683                         }
1684                 else
1685 #endif
1686 #ifndef OPENSSL_NO_DH
1687                         if (type & SSL_kEDH)
1688                         {
1689                         dhp=cert->dh_tmp;
1690                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1691                                 dhp=s->cert->dh_tmp_cb(s,
1692                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1693                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1694                         if (dhp == NULL)
1695                                 {
1696                                 al=SSL_AD_HANDSHAKE_FAILURE;
1697                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1698                                 goto f_err;
1699                                 }
1700
1701                         if (s->s3->tmp.dh != NULL)
1702                                 {
1703                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1704                                 goto err;
1705                                 }
1706
1707                         if ((dh=DHparams_dup(dhp)) == NULL)
1708                                 {
1709                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1710                                 goto err;
1711                                 }
1712
1713                         s->s3->tmp.dh=dh;
1714                         if ((dhp->pub_key == NULL ||
1715                              dhp->priv_key == NULL ||
1716                              (s->options & SSL_OP_SINGLE_DH_USE)))
1717                                 {
1718                                 if(!DH_generate_key(dh))
1719                                     {
1720                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1721                                            ERR_R_DH_LIB);
1722                                     goto err;
1723                                     }
1724                                 }
1725                         else
1726                                 {
1727                                 dh->pub_key=BN_dup(dhp->pub_key);
1728                                 dh->priv_key=BN_dup(dhp->priv_key);
1729                                 if ((dh->pub_key == NULL) ||
1730                                         (dh->priv_key == NULL))
1731                                         {
1732                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1733                                         goto err;
1734                                         }
1735                                 }
1736                         r[0]=dh->p;
1737                         r[1]=dh->g;
1738                         r[2]=dh->pub_key;
1739                         }
1740                 else
1741 #endif
1742 #ifndef OPENSSL_NO_ECDH
1743                         if (type & SSL_kEECDH)
1744                         {
1745                         const EC_GROUP *group;
1746
1747                         ecdhp=cert->ecdh_tmp;
1748                         if (s->cert->ecdh_tmp_auto)
1749                                 {
1750                                 /* Get NID of appropriate shared curve */
1751                                 int nid = tls1_shared_curve(s, -2);
1752                                 if (nid != NID_undef)
1753                                         ecdhp = EC_KEY_new_by_curve_name(nid);
1754                                 }
1755                         else if ((ecdhp == NULL) && s->cert->ecdh_tmp_cb)
1756                                 {
1757                                 ecdhp=s->cert->ecdh_tmp_cb(s,
1758                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1759                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1760                                 }
1761                         if (ecdhp == NULL)
1762                                 {
1763                                 al=SSL_AD_HANDSHAKE_FAILURE;
1764                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1765                                 goto f_err;
1766                                 }
1767
1768                         if (s->s3->tmp.ecdh != NULL)
1769                                 {
1770                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1771                                 goto err;
1772                                 }
1773
1774                         /* Duplicate the ECDH structure. */
1775                         if (ecdhp == NULL)
1776                                 {
1777                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1778                                 goto err;
1779                                 }
1780                         if (s->cert->ecdh_tmp_auto)
1781                                 ecdh = ecdhp;
1782                         else if ((ecdh = EC_KEY_dup(ecdhp)) == NULL)
1783                                 {
1784                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1785                                 goto err;
1786                                 }
1787
1788                         s->s3->tmp.ecdh=ecdh;
1789                         if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1790                             (EC_KEY_get0_private_key(ecdh) == NULL) ||
1791                             (s->options & SSL_OP_SINGLE_ECDH_USE))
1792                                 {
1793                                 if(!EC_KEY_generate_key(ecdh))
1794                                     {
1795                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1796                                     goto err;
1797                                     }
1798                                 }
1799
1800                         if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1801                             (EC_KEY_get0_public_key(ecdh)  == NULL) ||
1802                             (EC_KEY_get0_private_key(ecdh) == NULL))
1803                                 {
1804                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1805                                 goto err;
1806                                 }
1807
1808                         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1809                             (EC_GROUP_get_degree(group) > 163))
1810                                 {
1811                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1812                                 goto err;
1813                                 }
1814
1815                         /* XXX: For now, we only support ephemeral ECDH
1816                          * keys over named (not generic) curves. For
1817                          * supported named curves, curve_id is non-zero.
1818                          */
1819                         if ((curve_id =
1820                             tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1821                             == 0)
1822                                 {
1823                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1824                                 goto err;
1825                                 }
1826
1827                         /* Encode the public key.
1828                          * First check the size of encoding and
1829                          * allocate memory accordingly.
1830                          */
1831                         encodedlen = EC_POINT_point2oct(group,
1832                             EC_KEY_get0_public_key(ecdh),
1833                             POINT_CONVERSION_UNCOMPRESSED,
1834                             NULL, 0, NULL);
1835
1836                         encodedPoint = (unsigned char *)
1837                             OPENSSL_malloc(encodedlen*sizeof(unsigned char));
1838                         bn_ctx = BN_CTX_new();
1839                         if ((encodedPoint == NULL) || (bn_ctx == NULL))
1840                                 {
1841                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1842                                 goto err;
1843                                 }
1844
1845
1846                         encodedlen = EC_POINT_point2oct(group,
1847                             EC_KEY_get0_public_key(ecdh),
1848                             POINT_CONVERSION_UNCOMPRESSED,
1849                             encodedPoint, encodedlen, bn_ctx);
1850
1851                         if (encodedlen == 0)
1852                                 {
1853                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1854                                 goto err;
1855                                 }
1856
1857                         BN_CTX_free(bn_ctx);  bn_ctx=NULL;
1858
1859                         /* XXX: For now, we only support named (not
1860                          * generic) curves in ECDH ephemeral key exchanges.
1861                          * In this situation, we need four additional bytes
1862                          * to encode the entire ServerECDHParams
1863                          * structure.
1864                          */
1865                         n = 4 + encodedlen;
1866
1867                         /* We'll generate the serverKeyExchange message
1868                          * explicitly so we can set these to NULLs
1869                          */
1870                         r[0]=NULL;
1871                         r[1]=NULL;
1872                         r[2]=NULL;
1873                         r[3]=NULL;
1874                         }
1875                 else
1876 #endif /* !OPENSSL_NO_ECDH */
1877 #ifndef OPENSSL_NO_PSK
1878                         if (type & SSL_kPSK)
1879                                 {
1880                                 /* reserve size for record length and PSK identity hint*/
1881                                 n+=2+strlen(s->ctx->psk_identity_hint);
1882                                 }
1883                         else
1884 #endif /* !OPENSSL_NO_PSK */
1885 #ifndef OPENSSL_NO_SRP
1886                 if (type & SSL_kSRP)
1887                         {
1888                         if ((s->srp_ctx.N == NULL) ||
1889                                 (s->srp_ctx.g == NULL) ||
1890                                 (s->srp_ctx.s == NULL) ||
1891                                 (s->srp_ctx.B == NULL))
1892                                 {
1893                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_SRP_PARAM);
1894                                 goto err;
1895                                 }
1896                         r[0]=s->srp_ctx.N;
1897                         r[1]=s->srp_ctx.g;
1898                         r[2]=s->srp_ctx.s;
1899                         r[3]=s->srp_ctx.B;
1900                         }
1901                 else
1902 #endif
1903                         {
1904                         al=SSL_AD_HANDSHAKE_FAILURE;
1905                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1906                         goto f_err;
1907                         }
1908                 for (i=0; i < 4 && r[i] != NULL; i++)
1909                         {
1910                         nr[i]=BN_num_bytes(r[i]);
1911 #ifndef OPENSSL_NO_SRP
1912                         if ((i == 2) && (type & SSL_kSRP))
1913                                 n+=1+nr[i];
1914                         else
1915 #endif
1916                         n+=2+nr[i];
1917                         }
1918
1919                 if (!(s->s3->tmp.new_cipher->algorithm_auth & (SSL_aNULL|SSL_aSRP))
1920                         && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
1921                         {
1922                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher,&md))
1923                                 == NULL)
1924                                 {
1925                                 al=SSL_AD_DECODE_ERROR;
1926                                 goto f_err;
1927                                 }
1928                         kn=EVP_PKEY_size(pkey);
1929                         }
1930                 else
1931                         {
1932                         pkey=NULL;
1933                         kn=0;
1934                         }
1935
1936                 if (!BUF_MEM_grow_clean(buf,n+SSL_HM_HEADER_LENGTH(s)+kn))
1937                         {
1938                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1939                         goto err;
1940                         }
1941                 d = p = ssl_handshake_start(s);
1942
1943                 for (i=0; i < 4 && r[i] != NULL; i++)
1944                         {
1945 #ifndef OPENSSL_NO_SRP
1946                         if ((i == 2) && (type & SSL_kSRP))
1947                                 {
1948                                 *p = nr[i];
1949                                 p++;
1950                                 }
1951                         else
1952 #endif
1953                         s2n(nr[i],p);
1954                         BN_bn2bin(r[i],p);
1955                         p+=nr[i];
1956                         }
1957
1958 #ifndef OPENSSL_NO_ECDH
1959                 if (type & SSL_kEECDH)
1960                         {
1961                         /* XXX: For now, we only support named (not generic) curves.
1962                          * In this situation, the serverKeyExchange message has:
1963                          * [1 byte CurveType], [2 byte CurveName]
1964                          * [1 byte length of encoded point], followed by
1965                          * the actual encoded point itself
1966                          */
1967                         *p = NAMED_CURVE_TYPE;
1968                         p += 1;
1969                         *p = 0;
1970                         p += 1;
1971                         *p = curve_id;
1972                         p += 1;
1973                         *p = encodedlen;
1974                         p += 1;
1975                         memcpy((unsigned char*)p,
1976                             (unsigned char *)encodedPoint,
1977                             encodedlen);
1978                         OPENSSL_free(encodedPoint);
1979                         encodedPoint = NULL;
1980                         p += encodedlen;
1981                         }
1982 #endif
1983
1984 #ifndef OPENSSL_NO_PSK
1985                 if (type & SSL_kPSK)
1986                         {
1987                         /* copy PSK identity hint */
1988                         s2n(strlen(s->ctx->psk_identity_hint), p);
1989                         strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
1990                         p+=strlen(s->ctx->psk_identity_hint);
1991                         }
1992 #endif
1993
1994                 /* not anonymous */
1995                 if (pkey != NULL)
1996                         {
1997                         /* n is the length of the params, they start at &(d[4])
1998                          * and p points to the space at the end. */
1999 #ifndef OPENSSL_NO_RSA
2000                         if (pkey->type == EVP_PKEY_RSA && !SSL_USE_SIGALGS(s))
2001                                 {
2002                                 q=md_buf;
2003                                 j=0;
2004                                 for (num=2; num > 0; num--)
2005                                         {
2006                                         EVP_MD_CTX_set_flags(&md_ctx,
2007                                                 EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
2008                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
2009                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
2010                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
2011                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
2012                                         EVP_DigestUpdate(&md_ctx,d,n);
2013                                         EVP_DigestFinal_ex(&md_ctx,q,
2014                                                 (unsigned int *)&i);
2015                                         q+=i;
2016                                         j+=i;
2017                                         }
2018                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
2019                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
2020                                         {
2021                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
2022                                         goto err;
2023                                         }
2024                                 s2n(u,p);
2025                                 n+=u+2;
2026                                 }
2027                         else
2028 #endif
2029                         if (md)
2030                                 {
2031                                 /* send signature algorithm */
2032                                 if (SSL_USE_SIGALGS(s))
2033                                         {
2034                                         if (!tls12_get_sigandhash(p, pkey, md))
2035                                                 {
2036                                                 /* Should never happen */
2037                                                 al=SSL_AD_INTERNAL_ERROR;
2038                                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2039                                                 goto f_err;
2040                                                 }
2041                                         p+=2;
2042                                         }
2043 #ifdef SSL_DEBUG
2044                                 fprintf(stderr, "Using hash %s\n",
2045                                                         EVP_MD_name(md));
2046 #endif
2047                                 EVP_SignInit_ex(&md_ctx, md, NULL);
2048                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
2049                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
2050                                 EVP_SignUpdate(&md_ctx,d,n);
2051                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
2052                                         (unsigned int *)&i,pkey))
2053                                         {
2054                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_EVP);
2055                                         goto err;
2056                                         }
2057                                 s2n(i,p);
2058                                 n+=i+2;
2059                                 if (SSL_USE_SIGALGS(s))
2060                                         n+= 2;
2061                                 }
2062                         else
2063                                 {
2064                                 /* Is this error check actually needed? */
2065                                 al=SSL_AD_HANDSHAKE_FAILURE;
2066                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
2067                                 goto f_err;
2068                                 }
2069                         }
2070
2071                 ssl_set_handshake_header(s, SSL3_MT_SERVER_KEY_EXCHANGE, n);
2072                 }
2073
2074         s->state = SSL3_ST_SW_KEY_EXCH_B;
2075         EVP_MD_CTX_cleanup(&md_ctx);
2076         return ssl_do_write(s);
2077 f_err:
2078         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2079 err:
2080 #ifndef OPENSSL_NO_ECDH
2081         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2082         BN_CTX_free(bn_ctx);
2083 #endif
2084         EVP_MD_CTX_cleanup(&md_ctx);
2085         return(-1);
2086         }
2087
2088 int ssl3_send_certificate_request(SSL *s)
2089         {
2090         unsigned char *p,*d;
2091         int i,j,nl,off,n;
2092         STACK_OF(X509_NAME) *sk=NULL;
2093         X509_NAME *name;
2094         BUF_MEM *buf;
2095
2096         if (s->state == SSL3_ST_SW_CERT_REQ_A)
2097                 {
2098                 buf=s->init_buf;
2099
2100                 d=p=ssl_handshake_start(s);
2101
2102                 /* get the list of acceptable cert types */
2103                 p++;
2104                 n=ssl3_get_req_cert_type(s,p);
2105                 d[0]=n;
2106                 p+=n;
2107                 n++;
2108
2109                 if (SSL_USE_SIGALGS(s))
2110                         {
2111                         const unsigned char *psigs;
2112                         nl = tls12_get_psigalgs(s, &psigs);
2113                         s2n(nl, p);
2114                         memcpy(p, psigs, nl);
2115                         p += nl;
2116                         n += nl + 2;
2117                         }
2118
2119                 off=n;
2120                 p+=2;
2121                 n+=2;
2122
2123                 sk=SSL_get_client_CA_list(s);
2124                 nl=0;
2125                 if (sk != NULL)
2126                         {
2127                         for (i=0; i<sk_X509_NAME_num(sk); i++)
2128                                 {
2129                                 name=sk_X509_NAME_value(sk,i);
2130                                 j=i2d_X509_NAME(name,NULL);
2131                                 if (!BUF_MEM_grow_clean(buf,SSL_HM_HEADER_LENGTH(s)+n+j+2))
2132                                         {
2133                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
2134                                         goto err;
2135                                         }
2136                                 p = ssl_handshake_start(s) + n;
2137                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
2138                                         {
2139                                         s2n(j,p);
2140                                         i2d_X509_NAME(name,&p);
2141                                         n+=2+j;
2142                                         nl+=2+j;
2143                                         }
2144                                 else
2145                                         {
2146                                         d=p;
2147                                         i2d_X509_NAME(name,&p);
2148                                         j-=2; s2n(j,d); j+=2;
2149                                         n+=j;
2150                                         nl+=j;
2151                                         }
2152                                 }
2153                         }
2154                 /* else no CA names */
2155                 p = ssl_handshake_start(s) + off;
2156                 s2n(nl,p);
2157
2158                 ssl_set_handshake_header(s, SSL3_MT_CERTIFICATE_REQUEST, n);
2159
2160 #ifdef NETSCAPE_HANG_BUG
2161                 if (!SSL_IS_DTLS(s))
2162                         {
2163                         if (!BUF_MEM_grow_clean(buf, s->init_num + 4))
2164                                 {
2165                                 SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
2166                                 goto err;
2167                                 }
2168                         p=(unsigned char *)s->init_buf->data + s->init_num;
2169                         /* do the header */
2170                         *(p++)=SSL3_MT_SERVER_DONE;
2171                         *(p++)=0;
2172                         *(p++)=0;
2173                         *(p++)=0;
2174                         s->init_num += 4;
2175                         }
2176 #endif
2177
2178                 s->state = SSL3_ST_SW_CERT_REQ_B;
2179                 }
2180
2181         /* SSL3_ST_SW_CERT_REQ_B */
2182         return ssl_do_write(s);
2183 err:
2184         return(-1);
2185         }
2186
2187 int ssl3_get_client_key_exchange(SSL *s)
2188         {
2189         int i,al,ok;
2190         long n;
2191         unsigned long alg_k;
2192         unsigned char *p;
2193 #ifndef OPENSSL_NO_RSA
2194         RSA *rsa=NULL;
2195         EVP_PKEY *pkey=NULL;
2196 #endif
2197 #ifndef OPENSSL_NO_DH
2198         BIGNUM *pub=NULL;
2199         DH *dh_srvr, *dh_clnt = NULL;
2200 #endif
2201 #ifndef OPENSSL_NO_KRB5
2202         KSSL_ERR kssl_err;
2203 #endif /* OPENSSL_NO_KRB5 */
2204
2205 #ifndef OPENSSL_NO_ECDH
2206         EC_KEY *srvr_ecdh = NULL;
2207         EVP_PKEY *clnt_pub_pkey = NULL;
2208         EC_POINT *clnt_ecpoint = NULL;
2209         BN_CTX *bn_ctx = NULL;
2210 #endif
2211
2212         n=s->method->ssl_get_message(s,
2213                 SSL3_ST_SR_KEY_EXCH_A,
2214                 SSL3_ST_SR_KEY_EXCH_B,
2215                 SSL3_MT_CLIENT_KEY_EXCHANGE,
2216                 2048, /* ??? */
2217                 &ok);
2218
2219         if (!ok) return((int)n);
2220         p=(unsigned char *)s->init_msg;
2221
2222         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2223
2224 #ifndef OPENSSL_NO_RSA
2225         if (alg_k & SSL_kRSA)
2226                 {
2227                 unsigned char rand_premaster_secret[SSL_MAX_MASTER_KEY_LENGTH];
2228                 int decrypt_len;
2229                 unsigned char decrypt_good, version_good;
2230
2231                 /* FIX THIS UP EAY EAY EAY EAY */
2232                 if (s->s3->tmp.use_rsa_tmp)
2233                         {
2234                         if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
2235                                 rsa=s->cert->rsa_tmp;
2236                         /* Don't do a callback because rsa_tmp should
2237                          * be sent already */
2238                         if (rsa == NULL)
2239                                 {
2240                                 al=SSL_AD_HANDSHAKE_FAILURE;
2241                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
2242                                 goto f_err;
2243
2244                                 }
2245                         }
2246                 else
2247                         {
2248                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
2249                         if (    (pkey == NULL) ||
2250                                 (pkey->type != EVP_PKEY_RSA) ||
2251                                 (pkey->pkey.rsa == NULL))
2252                                 {
2253                                 al=SSL_AD_HANDSHAKE_FAILURE;
2254                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
2255                                 goto f_err;
2256                                 }
2257                         rsa=pkey->pkey.rsa;
2258                         }
2259
2260                 /* TLS and [incidentally] DTLS{0xFEFF} */
2261                 if (s->version > SSL3_VERSION && s->version != DTLS1_BAD_VER)
2262                         {
2263                         n2s(p,i);
2264                         if (n != i+2)
2265                                 {
2266                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
2267                                         {
2268                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
2269                                         goto err;
2270                                         }
2271                                 else
2272                                         p-=2;
2273                                 }
2274                         else
2275                                 n=i;
2276                         }
2277
2278                 /* We must not leak whether a decryption failure occurs because
2279                  * of Bleichenbacher's attack on PKCS #1 v1.5 RSA padding (see
2280                  * RFC 2246, section 7.4.7.1). The code follows that advice of
2281                  * the TLS RFC and generates a random premaster secret for the
2282                  * case that the decrypt fails. See
2283                  * https://tools.ietf.org/html/rfc5246#section-7.4.7.1 */
2284
2285                 /* should be RAND_bytes, but we cannot work around a failure. */
2286                 if (RAND_pseudo_bytes(rand_premaster_secret,
2287                                       sizeof(rand_premaster_secret)) <= 0)
2288                         goto err;
2289                 decrypt_len = RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
2290                 ERR_clear_error();
2291
2292                 /* decrypt_len should be SSL_MAX_MASTER_KEY_LENGTH.
2293                  * decrypt_good will be 0xff if so and zero otherwise. */
2294                 decrypt_good = constant_time_eq_int_8(decrypt_len, SSL_MAX_MASTER_KEY_LENGTH);
2295
2296                 /* If the version in the decrypted pre-master secret is correct
2297                  * then version_good will be 0xff, otherwise it'll be zero.
2298                  * The Klima-Pokorny-Rosa extension of Bleichenbacher's attack
2299                  * (http://eprint.iacr.org/2003/052/) exploits the version
2300                  * number check as a "bad version oracle". Thus version checks
2301                  * are done in constant time and are treated like any other
2302                  * decryption error. */
2303                 version_good = constant_time_eq_8(p[0], (unsigned)(s->client_version>>8));
2304                 version_good &= constant_time_eq_8(p[1], (unsigned)(s->client_version&0xff));
2305
2306                 /* The premaster secret must contain the same version number as
2307                  * the ClientHello to detect version rollback attacks
2308                  * (strangely, the protocol does not offer such protection for
2309                  * DH ciphersuites). However, buggy clients exist that send the
2310                  * negotiated protocol version instead if the server does not
2311                  * support the requested protocol version. If
2312                  * SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
2313                 if (s->options & SSL_OP_TLS_ROLLBACK_BUG)
2314                         {
2315                         unsigned char workaround_good;
2316                         workaround_good = constant_time_eq_8(p[0], (unsigned)(s->version>>8));
2317                         workaround_good &= constant_time_eq_8(p[1], (unsigned)(s->version&0xff));
2318                         version_good |= workaround_good;
2319                         }
2320
2321                 /* Both decryption and version must be good for decrypt_good
2322                  * to remain non-zero (0xff). */
2323                 decrypt_good &= version_good;
2324
2325                 /* Now copy rand_premaster_secret over p using
2326                  * decrypt_good_mask. */
2327                 for (i = 0; i < (int) sizeof(rand_premaster_secret); i++)
2328                         {
2329                         p[i] = constant_time_select_8(decrypt_good, p[i],
2330                                                       rand_premaster_secret[i]);
2331                         }
2332
2333                 s->session->master_key_length=
2334                         s->method->ssl3_enc->generate_master_secret(s,
2335                                 s->session->master_key,
2336                                 p,i);
2337                 OPENSSL_cleanse(p,i);
2338                 }
2339         else
2340 #endif
2341 #ifndef OPENSSL_NO_DH
2342                 if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2343                 {
2344                 int idx = -1;
2345                 EVP_PKEY *skey = NULL;
2346                 if (n)
2347                         n2s(p,i);
2348                 else
2349                         i = 0;
2350                 if (n && n != i+2)
2351                         {
2352                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
2353                                 {
2354                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
2355                                 goto err;
2356                                 }
2357                         else
2358                                 {
2359                                 p-=2;
2360                                 i=(int)n;
2361                                 }
2362                         }
2363                 if (alg_k & SSL_kDHr)
2364                         idx = SSL_PKEY_DH_RSA;
2365                 else if (alg_k & SSL_kDHd)
2366                         idx = SSL_PKEY_DH_DSA;
2367                 if (idx >= 0)
2368                         {
2369                         skey = s->cert->pkeys[idx].privatekey;
2370                         if ((skey == NULL) ||
2371                                 (skey->type != EVP_PKEY_DH) ||
2372                                 (skey->pkey.dh == NULL))
2373                                 {
2374                                 al=SSL_AD_HANDSHAKE_FAILURE;
2375                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
2376                                 goto f_err;
2377                                 }
2378                         dh_srvr = skey->pkey.dh;
2379                         }
2380                 else if (s->s3->tmp.dh == NULL)
2381                         {
2382                         al=SSL_AD_HANDSHAKE_FAILURE;
2383                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
2384                         goto f_err;
2385                         }
2386                 else
2387                         dh_srvr=s->s3->tmp.dh;
2388
2389                 if (n == 0L)
2390                         {
2391                         /* Get pubkey from cert */
2392                         EVP_PKEY *clkey=X509_get_pubkey(s->session->peer);
2393                         if (clkey)
2394                                 {
2395                                 if (EVP_PKEY_cmp_parameters(clkey, skey) == 1)
2396                                         dh_clnt = EVP_PKEY_get1_DH(clkey);
2397                                 }
2398                         if (dh_clnt == NULL)
2399                                 {
2400                                 al=SSL_AD_HANDSHAKE_FAILURE;
2401                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
2402                                 goto f_err;
2403                                 }
2404                         EVP_PKEY_free(clkey);
2405                         pub = dh_clnt->pub_key;
2406                         }
2407                 else
2408                         pub=BN_bin2bn(p,i,NULL);
2409                 if (pub == NULL)
2410                         {
2411                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
2412                         goto err;
2413                         }
2414
2415                 i=DH_compute_key(p,pub,dh_srvr);
2416
2417                 if (i <= 0)
2418                         {
2419                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2420                         BN_clear_free(pub);
2421                         goto err;
2422                         }
2423
2424                 DH_free(s->s3->tmp.dh);
2425                 s->s3->tmp.dh=NULL;
2426                 if (dh_clnt)
2427                         DH_free(dh_clnt);
2428                 else
2429                         BN_clear_free(pub);
2430                 pub=NULL;
2431                 s->session->master_key_length=
2432                         s->method->ssl3_enc->generate_master_secret(s,
2433                                 s->session->master_key,p,i);
2434                 OPENSSL_cleanse(p,i);
2435                 if (dh_clnt)
2436                         return 2;
2437                 }
2438         else
2439 #endif
2440 #ifndef OPENSSL_NO_KRB5
2441         if (alg_k & SSL_kKRB5)
2442                 {
2443                 krb5_error_code         krb5rc;
2444                 krb5_data               enc_ticket;
2445                 krb5_data               authenticator;
2446                 krb5_data               enc_pms;
2447                 KSSL_CTX                *kssl_ctx = s->kssl_ctx;
2448                 EVP_CIPHER_CTX          ciph_ctx;
2449                 const EVP_CIPHER        *enc = NULL;
2450                 unsigned char           iv[EVP_MAX_IV_LENGTH];
2451                 unsigned char           pms[SSL_MAX_MASTER_KEY_LENGTH
2452                                                + EVP_MAX_BLOCK_LENGTH];
2453                 int                  padl, outl;
2454                 krb5_timestamp          authtime = 0;
2455                 krb5_ticket_times       ttimes;
2456
2457                 EVP_CIPHER_CTX_init(&ciph_ctx);
2458
2459                 if (!kssl_ctx)  kssl_ctx = kssl_ctx_new();
2460
2461                 n2s(p,i);
2462                 enc_ticket.length = i;
2463
2464                 if (n < (long)(enc_ticket.length + 6))
2465                         {
2466                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2467                                 SSL_R_DATA_LENGTH_TOO_LONG);
2468                         goto err;
2469                         }
2470
2471                 enc_ticket.data = (char *)p;
2472                 p+=enc_ticket.length;
2473
2474                 n2s(p,i);
2475                 authenticator.length = i;
2476
2477                 if (n < (long)(enc_ticket.length + authenticator.length + 6))
2478                         {
2479                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2480                                 SSL_R_DATA_LENGTH_TOO_LONG);
2481                         goto err;
2482                         }
2483
2484                 authenticator.data = (char *)p;
2485                 p+=authenticator.length;
2486
2487                 n2s(p,i);
2488                 enc_pms.length = i;
2489                 enc_pms.data = (char *)p;
2490                 p+=enc_pms.length;
2491
2492                 /* Note that the length is checked again below,
2493                 ** after decryption
2494                 */
2495                 if(enc_pms.length > sizeof pms)
2496                         {
2497                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2498                                SSL_R_DATA_LENGTH_TOO_LONG);
2499                         goto err;
2500                         }
2501
2502                 if (n != (long)(enc_ticket.length + authenticator.length +
2503                                                 enc_pms.length + 6))
2504                         {
2505                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2506                                 SSL_R_DATA_LENGTH_TOO_LONG);
2507                         goto err;
2508                         }
2509
2510                 if ((krb5rc = kssl_sget_tkt(kssl_ctx, &enc_ticket, &ttimes,
2511                                         &kssl_err)) != 0)
2512                         {
2513 #ifdef KSSL_DEBUG
2514                         printf("kssl_sget_tkt rtn %d [%d]\n",
2515                                 krb5rc, kssl_err.reason);
2516                         if (kssl_err.text)
2517                                 printf("kssl_err text= %s\n", kssl_err.text);
2518 #endif  /* KSSL_DEBUG */
2519                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2520                                 kssl_err.reason);
2521                         goto err;
2522                         }
2523
2524                 /*  Note: no authenticator is not considered an error,
2525                 **  but will return authtime == 0.
2526                 */
2527                 if ((krb5rc = kssl_check_authent(kssl_ctx, &authenticator,
2528                                         &authtime, &kssl_err)) != 0)
2529                         {
2530 #ifdef KSSL_DEBUG
2531                         printf("kssl_check_authent rtn %d [%d]\n",
2532                                 krb5rc, kssl_err.reason);
2533                         if (kssl_err.text)
2534                                 printf("kssl_err text= %s\n", kssl_err.text);
2535 #endif  /* KSSL_DEBUG */
2536                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2537                                 kssl_err.reason);
2538                         goto err;
2539                         }
2540
2541                 if ((krb5rc = kssl_validate_times(authtime, &ttimes)) != 0)
2542                         {
2543                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, krb5rc);
2544                         goto err;
2545                         }
2546
2547 #ifdef KSSL_DEBUG
2548                 kssl_ctx_show(kssl_ctx);
2549 #endif  /* KSSL_DEBUG */
2550
2551                 enc = kssl_map_enc(kssl_ctx->enctype);
2552                 if (enc == NULL)
2553                     goto err;
2554
2555                 memset(iv, 0, sizeof iv);       /* per RFC 1510 */
2556
2557                 if (!EVP_DecryptInit_ex(&ciph_ctx,enc,NULL,kssl_ctx->key,iv))
2558                         {
2559                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2560                                 SSL_R_DECRYPTION_FAILED);
2561                         goto err;
2562                         }
2563                 if (!EVP_DecryptUpdate(&ciph_ctx, pms,&outl,
2564                                         (unsigned char *)enc_pms.data, enc_pms.length))
2565                         {
2566                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2567                                 SSL_R_DECRYPTION_FAILED);
2568                         goto err;
2569                         }
2570                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2571                         {
2572                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2573                                 SSL_R_DATA_LENGTH_TOO_LONG);
2574                         goto err;
2575                         }
2576                 if (!EVP_DecryptFinal_ex(&ciph_ctx,&(pms[outl]),&padl))
2577                         {
2578                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2579                                 SSL_R_DECRYPTION_FAILED);
2580                         goto err;
2581                         }
2582                 outl += padl;
2583                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2584                         {
2585                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2586                                 SSL_R_DATA_LENGTH_TOO_LONG);
2587                         goto err;
2588                         }
2589                 if (!((pms[0] == (s->client_version>>8)) && (pms[1] == (s->client_version & 0xff))))
2590                     {
2591                     /* The premaster secret must contain the same version number as the
2592                      * ClientHello to detect version rollback attacks (strangely, the
2593                      * protocol does not offer such protection for DH ciphersuites).
2594                      * However, buggy clients exist that send random bytes instead of
2595                      * the protocol version.
2596                      * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients.
2597                      * (Perhaps we should have a separate BUG value for the Kerberos cipher)
2598                      */
2599                     if (!(s->options & SSL_OP_TLS_ROLLBACK_BUG))
2600                         {
2601                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2602                                SSL_AD_DECODE_ERROR);
2603                         goto err;
2604                         }
2605                     }
2606
2607                 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2608
2609                 s->session->master_key_length=
2610                         s->method->ssl3_enc->generate_master_secret(s,
2611                                 s->session->master_key, pms, outl);
2612
2613                 if (kssl_ctx->client_princ)
2614                         {
2615                         size_t len = strlen(kssl_ctx->client_princ);
2616                         if ( len < SSL_MAX_KRB5_PRINCIPAL_LENGTH )
2617                                 {
2618                                 s->session->krb5_client_princ_len = len;
2619                                 memcpy(s->session->krb5_client_princ,kssl_ctx->client_princ,len);
2620                                 }
2621                         }
2622
2623
2624                 /*  Was doing kssl_ctx_free() here,
2625                 **  but it caused problems for apache.
2626                 **  kssl_ctx = kssl_ctx_free(kssl_ctx);
2627                 **  if (s->kssl_ctx)  s->kssl_ctx = NULL;
2628                 */
2629                 }
2630         else
2631 #endif  /* OPENSSL_NO_KRB5 */
2632
2633 #ifndef OPENSSL_NO_ECDH
2634                 if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2635                 {
2636                 int ret = 1;
2637                 int field_size = 0;
2638                 const EC_KEY   *tkey;
2639                 const EC_GROUP *group;
2640                 const BIGNUM *priv_key;
2641
2642                 /* initialize structures for server's ECDH key pair */
2643                 if ((srvr_ecdh = EC_KEY_new()) == NULL)
2644                         {
2645                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2646                             ERR_R_MALLOC_FAILURE);
2647                         goto err;
2648                         }
2649
2650                 /* Let's get server private key and group information */
2651                 if (alg_k & (SSL_kECDHr|SSL_kECDHe))
2652                         {
2653                         /* use the certificate */
2654                         tkey = s->cert->pkeys[SSL_PKEY_ECC].privatekey->pkey.ec;
2655                         }
2656                 else
2657                         {
2658                         /* use the ephermeral values we saved when
2659                          * generating the ServerKeyExchange msg.
2660                          */
2661                         tkey = s->s3->tmp.ecdh;
2662                         }
2663
2664                 group    = EC_KEY_get0_group(tkey);
2665                 priv_key = EC_KEY_get0_private_key(tkey);
2666
2667                 if (!EC_KEY_set_group(srvr_ecdh, group) ||
2668                     !EC_KEY_set_private_key(srvr_ecdh, priv_key))
2669                         {
2670                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2671                                ERR_R_EC_LIB);
2672                         goto err;
2673                         }
2674
2675                 /* Let's get client's public key */
2676                 if ((clnt_ecpoint = EC_POINT_new(group)) == NULL)
2677                         {
2678                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2679                             ERR_R_MALLOC_FAILURE);
2680                         goto err;
2681                         }
2682
2683                 if (n == 0L)
2684                         {
2685                         /* Client Publickey was in Client Certificate */
2686
2687                          if (alg_k & SSL_kEECDH)
2688                                  {
2689                                  al=SSL_AD_HANDSHAKE_FAILURE;
2690                                  SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
2691                                  goto f_err;
2692                                  }
2693                         if (((clnt_pub_pkey=X509_get_pubkey(s->session->peer))
2694                             == NULL) ||
2695                             (clnt_pub_pkey->type != EVP_PKEY_EC))
2696                                 {
2697                                 /* XXX: For now, we do not support client
2698                                  * authentication using ECDH certificates
2699                                  * so this branch (n == 0L) of the code is
2700                                  * never executed. When that support is
2701                                  * added, we ought to ensure the key
2702                                  * received in the certificate is
2703                                  * authorized for key agreement.
2704                                  * ECDH_compute_key implicitly checks that
2705                                  * the two ECDH shares are for the same
2706                                  * group.
2707                                  */
2708                                 al=SSL_AD_HANDSHAKE_FAILURE;
2709                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2710                                     SSL_R_UNABLE_TO_DECODE_ECDH_CERTS);
2711                                 goto f_err;
2712                                 }
2713
2714                         if (EC_POINT_copy(clnt_ecpoint,
2715                             EC_KEY_get0_public_key(clnt_pub_pkey->pkey.ec)) == 0)
2716                                 {
2717                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2718                                         ERR_R_EC_LIB);
2719                                 goto err;
2720                                 }
2721                         ret = 2; /* Skip certificate verify processing */
2722                         }
2723                 else
2724                         {
2725                         /* Get client's public key from encoded point
2726                          * in the ClientKeyExchange message.
2727                          */
2728                         if ((bn_ctx = BN_CTX_new()) == NULL)
2729                                 {
2730                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2731                                     ERR_R_MALLOC_FAILURE);
2732                                 goto err;
2733                                 }
2734
2735                         /* Get encoded point length */
2736                         i = *p;
2737                         p += 1;
2738                         if (n != 1 + i)
2739                                 {
2740                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2741                                     ERR_R_EC_LIB);
2742                                 goto err;
2743                                 }
2744                         if (EC_POINT_oct2point(group,
2745                             clnt_ecpoint, p, i, bn_ctx) == 0)
2746                                 {
2747                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2748                                     ERR_R_EC_LIB);
2749                                 goto err;
2750                                 }
2751                         /* p is pointing to somewhere in the buffer
2752                          * currently, so set it to the start
2753                          */
2754                         p=(unsigned char *)s->init_buf->data;
2755                         }
2756
2757                 /* Compute the shared pre-master secret */
2758                 field_size = EC_GROUP_get_degree(group);
2759                 if (field_size <= 0)
2760                         {
2761                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2762                                ERR_R_ECDH_LIB);
2763                         goto err;
2764                         }
2765                 i = ECDH_compute_key(p, (field_size+7)/8, clnt_ecpoint, srvr_ecdh, NULL);
2766                 if (i <= 0)
2767                         {
2768                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2769                             ERR_R_ECDH_LIB);
2770                         goto err;
2771                         }
2772
2773                 EVP_PKEY_free(clnt_pub_pkey);
2774                 EC_POINT_free(clnt_ecpoint);
2775                 EC_KEY_free(srvr_ecdh);
2776                 BN_CTX_free(bn_ctx);
2777                 EC_KEY_free(s->s3->tmp.ecdh);
2778                 s->s3->tmp.ecdh = NULL;
2779
2780                 /* Compute the master secret */
2781                 s->session->master_key_length = s->method->ssl3_enc-> \
2782                     generate_master_secret(s, s->session->master_key, p, i);
2783
2784                 OPENSSL_cleanse(p, i);
2785                 return (ret);
2786                 }
2787         else
2788 #endif
2789 #ifndef OPENSSL_NO_PSK
2790                 if (alg_k & SSL_kPSK)
2791                         {
2792                         unsigned char *t = NULL;
2793                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
2794                         unsigned int pre_ms_len = 0, psk_len = 0;
2795                         int psk_err = 1;
2796                         char tmp_id[PSK_MAX_IDENTITY_LEN+1];
2797
2798                         al=SSL_AD_HANDSHAKE_FAILURE;
2799
2800                         n2s(p,i);
2801                         if (n != i+2)
2802                                 {
2803                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2804                                         SSL_R_LENGTH_MISMATCH);
2805                                 goto psk_err;
2806                                 }
2807                         if (i > PSK_MAX_IDENTITY_LEN)
2808                                 {
2809                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2810                                         SSL_R_DATA_LENGTH_TOO_LONG);
2811                                 goto psk_err;
2812                                 }
2813                         if (s->psk_server_callback == NULL)
2814                                 {
2815                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2816                                        SSL_R_PSK_NO_SERVER_CB);
2817                                 goto psk_err;
2818                                 }
2819
2820                         /* Create guaranteed NULL-terminated identity
2821                          * string for the callback */
2822                         memcpy(tmp_id, p, i);
2823                         memset(tmp_id+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
2824                         psk_len = s->psk_server_callback(s, tmp_id,
2825                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
2826                         OPENSSL_cleanse(tmp_id, PSK_MAX_IDENTITY_LEN+1);
2827
2828                         if (psk_len > PSK_MAX_PSK_LEN)
2829                                 {
2830                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2831                                         ERR_R_INTERNAL_ERROR);
2832                                 goto psk_err;
2833                                 }
2834                         else if (psk_len == 0)
2835                                 {
2836                                 /* PSK related to the given identity not found */
2837                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2838                                        SSL_R_PSK_IDENTITY_NOT_FOUND);
2839                                 al=SSL_AD_UNKNOWN_PSK_IDENTITY;
2840                                 goto psk_err;
2841                                 }
2842
2843                         /* create PSK pre_master_secret */
2844                         pre_ms_len=2+psk_len+2+psk_len;
2845                         t = psk_or_pre_ms;
2846                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
2847                         s2n(psk_len, t);
2848                         memset(t, 0, psk_len);
2849                         t+=psk_len;
2850                         s2n(psk_len, t);
2851
2852                         if (s->session->psk_identity != NULL)
2853                                 OPENSSL_free(s->session->psk_identity);
2854                         s->session->psk_identity = BUF_strdup((char *)p);
2855                         if (s->session->psk_identity == NULL)
2856                                 {
2857                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2858                                         ERR_R_MALLOC_FAILURE);
2859                                 goto psk_err;
2860                                 }
2861
2862                         if (s->session->psk_identity_hint != NULL)
2863                                 OPENSSL_free(s->session->psk_identity_hint);
2864                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
2865                         if (s->ctx->psk_identity_hint != NULL &&
2866                                 s->session->psk_identity_hint == NULL)
2867                                 {
2868                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2869                                         ERR_R_MALLOC_FAILURE);
2870                                 goto psk_err;
2871                                 }
2872
2873                         s->session->master_key_length=
2874                                 s->method->ssl3_enc->generate_master_secret(s,
2875                                         s->session->master_key, psk_or_pre_ms, pre_ms_len);
2876                         psk_err = 0;
2877                 psk_err:
2878                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
2879                         if (psk_err != 0)
2880                                 goto f_err;
2881                         }
2882                 else
2883 #endif
2884 #ifndef OPENSSL_NO_SRP
2885                 if (alg_k & SSL_kSRP)
2886                         {
2887                         int param_len;
2888
2889                         n2s(p,i);
2890                         param_len=i+2;
2891                         if (param_len > n)
2892                                 {
2893                                 al=SSL_AD_DECODE_ERROR;
2894                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_SRP_A_LENGTH);
2895                                 goto f_err;
2896                                 }
2897                         if (!(s->srp_ctx.A=BN_bin2bn(p,i,NULL)))
2898                                 {
2899                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_BN_LIB);
2900                                 goto err;
2901                                 }
2902                         if (BN_ucmp(s->srp_ctx.A, s->srp_ctx.N) >= 0
2903                                 || BN_is_zero(s->srp_ctx.A))
2904                                 {
2905                                 al=SSL_AD_ILLEGAL_PARAMETER;
2906                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_SRP_PARAMETERS);
2907                                 goto f_err;
2908                                 }
2909                         if (s->session->srp_username != NULL)
2910                                 OPENSSL_free(s->session->srp_username);
2911                         s->session->srp_username = BUF_strdup(s->srp_ctx.login);
2912                         if (s->session->srp_username == NULL)
2913                                 {
2914                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2915                                         ERR_R_MALLOC_FAILURE);
2916                                 goto err;
2917                                 }
2918
2919                         if ((s->session->master_key_length = SRP_generate_server_master_secret(s,s->session->master_key))<0)
2920                                 {
2921                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2922                                 goto err;
2923                                 }
2924
2925                         p+=i;
2926                         }
2927                 else
2928 #endif  /* OPENSSL_NO_SRP */
2929                 if (alg_k & SSL_kGOST)
2930                         {
2931                         int ret = 0;
2932                         EVP_PKEY_CTX *pkey_ctx;
2933                         EVP_PKEY *client_pub_pkey = NULL, *pk = NULL;
2934                         unsigned char premaster_secret[32], *start;
2935                         size_t outlen=32, inlen;
2936                         unsigned long alg_a;
2937                         int Ttag, Tclass;
2938                         long Tlen;
2939
2940                         /* Get our certificate private key*/
2941                         alg_a = s->s3->tmp.new_cipher->algorithm_auth;
2942                         if (alg_a & SSL_aGOST94)
2943                                 pk = s->cert->pkeys[SSL_PKEY_GOST94].privatekey;
2944                         else if (alg_a & SSL_aGOST01)
2945                                 pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey;
2946
2947                         pkey_ctx = EVP_PKEY_CTX_new(pk,NULL);
2948                         EVP_PKEY_decrypt_init(pkey_ctx);
2949                         /* If client certificate is present and is of the same type, maybe
2950                          * use it for key exchange.  Don't mind errors from
2951                          * EVP_PKEY_derive_set_peer, because it is completely valid to use
2952                          * a client certificate for authorization only. */
2953                         client_pub_pkey = X509_get_pubkey(s->session->peer);
2954                         if (client_pub_pkey)
2955                                 {
2956                                 if (EVP_PKEY_derive_set_peer(pkey_ctx, client_pub_pkey) <= 0)
2957                                         ERR_clear_error();
2958                                 }
2959                         /* Decrypt session key */
2960                         if (ASN1_get_object((const unsigned char **)&p, &Tlen, &Ttag, &Tclass, n) != V_ASN1_CONSTRUCTED ||
2961                                 Ttag != V_ASN1_SEQUENCE ||
2962                                 Tclass != V_ASN1_UNIVERSAL)
2963                                 {
2964                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2965                                 goto gerr;
2966                                 }
2967                         start = p;
2968                         inlen = Tlen;
2969                         if (EVP_PKEY_decrypt(pkey_ctx,premaster_secret,&outlen,start,inlen) <=0)
2970
2971                                 {
2972                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2973                                 goto gerr;
2974                                 }
2975                         /* Generate master secret */
2976                         s->session->master_key_length=
2977                                 s->method->ssl3_enc->generate_master_secret(s,
2978                                         s->session->master_key,premaster_secret,32);
2979                         /* Check if pubkey from client certificate was used */
2980                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
2981                                 ret = 2;
2982                         else
2983                                 ret = 1;
2984                 gerr:
2985                         EVP_PKEY_free(client_pub_pkey);
2986                         EVP_PKEY_CTX_free(pkey_ctx);
2987                         if (ret)
2988                                 return ret;
2989                         else
2990                                 goto err;
2991                         }
2992                 else
2993                 {
2994                 al=SSL_AD_HANDSHAKE_FAILURE;
2995                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2996                                 SSL_R_UNKNOWN_CIPHER_TYPE);
2997                 goto f_err;
2998                 }
2999
3000         return(1);
3001 f_err:
3002         ssl3_send_alert(s,SSL3_AL_FATAL,al);
3003 #if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA) || !defined(OPENSSL_NO_ECDH) || defined(OPENSSL_NO_SRP)
3004 err:
3005 #endif
3006 #ifndef OPENSSL_NO_ECDH
3007         EVP_PKEY_free(clnt_pub_pkey);
3008         EC_POINT_free(clnt_ecpoint);
3009         if (srvr_ecdh != NULL)
3010                 EC_KEY_free(srvr_ecdh);
3011         BN_CTX_free(bn_ctx);
3012 #endif
3013         return(-1);
3014         }
3015
3016 int ssl3_get_cert_verify(SSL *s)
3017         {
3018         EVP_PKEY *pkey=NULL;
3019         unsigned char *p;
3020         int al,ok,ret=0;
3021         long n;
3022         int type=0,i,j;
3023         X509 *peer;
3024         const EVP_MD *md = NULL;
3025         EVP_MD_CTX mctx;
3026         EVP_MD_CTX_init(&mctx);
3027
3028         n=s->method->ssl_get_message(s,
3029                 SSL3_ST_SR_CERT_VRFY_A,
3030                 SSL3_ST_SR_CERT_VRFY_B,
3031                 -1,
3032                 SSL3_RT_MAX_PLAIN_LENGTH,
3033                 &ok);
3034
3035         if (!ok) return((int)n);
3036
3037         if (s->session->peer != NULL)
3038                 {
3039                 peer=s->session->peer;
3040                 pkey=X509_get_pubkey(peer);
3041                 type=X509_certificate_type(peer,pkey);
3042                 }
3043         else
3044                 {
3045                 peer=NULL;
3046                 pkey=NULL;
3047                 }
3048
3049         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
3050                 {
3051                 s->s3->tmp.reuse_message=1;
3052                 if ((peer != NULL) && (type & EVP_PKT_SIGN))
3053                         {
3054                         al=SSL_AD_UNEXPECTED_MESSAGE;
3055                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
3056                         goto f_err;
3057                         }
3058                 ret=1;
3059                 goto end;
3060                 }
3061
3062         if (peer == NULL)
3063                 {
3064                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
3065                 al=SSL_AD_UNEXPECTED_MESSAGE;
3066                 goto f_err;
3067                 }
3068
3069         if (!(type & EVP_PKT_SIGN))
3070                 {
3071                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
3072                 al=SSL_AD_ILLEGAL_PARAMETER;
3073                 goto f_err;
3074                 }
3075
3076         if (s->s3->change_cipher_spec)
3077                 {
3078                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
3079                 al=SSL_AD_UNEXPECTED_MESSAGE;
3080                 goto f_err;
3081                 }
3082
3083         /* we now have a signature that we need to verify */
3084         p=(unsigned char *)s->init_msg;
3085         /* Check for broken implementations of GOST ciphersuites */
3086         /* If key is GOST and n is exactly 64, it is bare
3087          * signature without length field */
3088         if (n==64 && (pkey->type==NID_id_GostR3410_94 ||
3089                 pkey->type == NID_id_GostR3410_2001) )
3090                 {
3091                 i=64;
3092                 }
3093         else
3094                 {
3095                 if (SSL_USE_SIGALGS(s))
3096                         {
3097                         int rv = tls12_check_peer_sigalg(&md, s, p, pkey);
3098                         if (rv == -1)
3099                                 {
3100                                 al = SSL_AD_INTERNAL_ERROR;
3101                                 goto f_err;
3102                                 }
3103                         else if (rv == 0)
3104                                 {
3105                                 al = SSL_AD_DECODE_ERROR;
3106                                 goto f_err;
3107                                 }
3108 #ifdef SSL_DEBUG
3109 fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
3110 #endif
3111                         p += 2;
3112                         n -= 2;
3113                         }
3114                 n2s(p,i);
3115                 n-=2;
3116                 if (i > n)
3117                         {
3118                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
3119                         al=SSL_AD_DECODE_ERROR;
3120                         goto f_err;
3121                         }
3122         }
3123         j=EVP_PKEY_size(pkey);
3124         if ((i > j) || (n > j) || (n <= 0))
3125                 {
3126                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
3127                 al=SSL_AD_DECODE_ERROR;
3128                 goto f_err;
3129                 }
3130
3131         if (SSL_USE_SIGALGS(s))
3132                 {
3133                 long hdatalen = 0;
3134                 void *hdata;
3135                 hdatalen = BIO_get_mem_data(s->s3->handshake_buffer, &hdata);
3136                 if (hdatalen <= 0)
3137                         {
3138                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, ERR_R_INTERNAL_ERROR);
3139                         al=SSL_AD_INTERNAL_ERROR;
3140                         goto f_err;
3141                         }
3142 #ifdef SSL_DEBUG
3143                 fprintf(stderr, "Using TLS 1.2 with client verify alg %s\n",
3144                                                         EVP_MD_name(md));
3145 #endif
3146                 if (!EVP_VerifyInit_ex(&mctx, md, NULL)
3147                         || !EVP_VerifyUpdate(&mctx, hdata, hdatalen))
3148                         {
3149                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, ERR_R_EVP_LIB);
3150                         al=SSL_AD_INTERNAL_ERROR;
3151                         goto f_err;
3152                         }
3153
3154                 if (EVP_VerifyFinal(&mctx, p , i, pkey) <= 0)
3155                         {
3156                         al=SSL_AD_DECRYPT_ERROR;
3157                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_SIGNATURE);
3158                         goto f_err;
3159                         }
3160                 }
3161         else
3162 #ifndef OPENSSL_NO_RSA
3163         if (pkey->type == EVP_PKEY_RSA)
3164                 {
3165                 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
3166                         MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i,
3167                                                         pkey->pkey.rsa);
3168                 if (i < 0)
3169                         {
3170                         al=SSL_AD_DECRYPT_ERROR;
3171                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
3172                         goto f_err;
3173                         }
3174                 if (i == 0)
3175                         {
3176                         al=SSL_AD_DECRYPT_ERROR;
3177                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
3178                         goto f_err;
3179                         }
3180                 }
3181         else
3182 #endif
3183 #ifndef OPENSSL_NO_DSA
3184                 if (pkey->type == EVP_PKEY_DSA)
3185                 {
3186                 j=DSA_verify(pkey->save_type,
3187                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
3188                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
3189                 if (j <= 0)
3190                         {
3191                         /* bad signature */
3192                         al=SSL_AD_DECRYPT_ERROR;
3193                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
3194                         goto f_err;
3195                         }
3196                 }
3197         else
3198 #endif
3199 #ifndef OPENSSL_NO_ECDSA
3200                 if (pkey->type == EVP_PKEY_EC)
3201                 {
3202                 j=ECDSA_verify(pkey->save_type,
3203                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
3204                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.ec);
3205                 if (j <= 0)
3206                         {
3207                         /* bad signature */
3208                         al=SSL_AD_DECRYPT_ERROR;
3209                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
3210                             SSL_R_BAD_ECDSA_SIGNATURE);
3211                         goto f_err;
3212                         }
3213                 }
3214         else
3215 #endif
3216         if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001)
3217                 {   unsigned char signature[64];
3218                         int idx;
3219                         EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new(pkey,NULL);
3220                         EVP_PKEY_verify_init(pctx);
3221                         if (i!=64) {
3222                                 fprintf(stderr,"GOST signature length is %d",i);
3223                         }
3224                         for (idx=0;idx<64;idx++) {
3225                                 signature[63-idx]=p[idx];
3226                         }
3227                         j=EVP_PKEY_verify(pctx,signature,64,s->s3->tmp.cert_verify_md,32);
3228                         EVP_PKEY_CTX_free(pctx);
3229                         if (j<=0)
3230                                 {
3231                                 al=SSL_AD_DECRYPT_ERROR;
3232                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
3233                                         SSL_R_BAD_ECDSA_SIGNATURE);
3234                                 goto f_err;
3235                                 }
3236                 }
3237         else
3238                 {
3239                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
3240                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
3241                 goto f_err;
3242                 }
3243
3244
3245         ret=1;
3246         if (0)
3247                 {
3248 f_err:
3249                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
3250                 }
3251 end:
3252         if (s->s3->handshake_buffer)
3253                 {
3254                 BIO_free(s->s3->handshake_buffer);
3255                 s->s3->handshake_buffer = NULL;
3256                 s->s3->flags &= ~TLS1_FLAGS_KEEP_HANDSHAKE;
3257                 }
3258         EVP_MD_CTX_cleanup(&mctx);
3259         EVP_PKEY_free(pkey);
3260         return(ret);
3261         }
3262
3263 int ssl3_get_client_certificate(SSL *s)
3264         {
3265         int i,ok,al,ret= -1;
3266         X509 *x=NULL;
3267         unsigned long l,nc,llen,n;
3268         const unsigned char *p,*q;
3269         unsigned char *d;
3270         STACK_OF(X509) *sk=NULL;
3271
3272         n=s->method->ssl_get_message(s,
3273                 SSL3_ST_SR_CERT_A,
3274                 SSL3_ST_SR_CERT_B,
3275                 -1,
3276                 s->max_cert_list,
3277                 &ok);
3278
3279         if (!ok) return((int)n);
3280
3281         if      (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
3282                 {
3283                 if (    (s->verify_mode & SSL_VERIFY_PEER) &&
3284                         (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
3285                         {
3286                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
3287                         al=SSL_AD_HANDSHAKE_FAILURE;
3288                         goto f_err;
3289                         }
3290                 /* If tls asked for a client cert, the client must return a 0 list */
3291                 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
3292                         {
3293                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
3294                         al=SSL_AD_UNEXPECTED_MESSAGE;
3295                         goto f_err;
3296                         }
3297                 s->s3->tmp.reuse_message=1;
3298                 return(1);
3299                 }
3300
3301         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
3302                 {
3303                 al=SSL_AD_UNEXPECTED_MESSAGE;
3304                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
3305                 goto f_err;
3306                 }
3307         p=d=(unsigned char *)s->init_msg;
3308
3309         if ((sk=sk_X509_new_null()) == NULL)
3310                 {
3311                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
3312                 goto err;
3313                 }
3314
3315         n2l3(p,llen);
3316         if (llen+3 != n)
3317                 {
3318                 al=SSL_AD_DECODE_ERROR;
3319                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
3320                 goto f_err;
3321                 }
3322         for (nc=0; nc<llen; )
3323                 {
3324                 n2l3(p,l);
3325                 if ((l+nc+3) > llen)
3326                         {
3327                         al=SSL_AD_DECODE_ERROR;
3328                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
3329                         goto f_err;
3330                         }
3331
3332                 q=p;
3333                 x=d2i_X509(NULL,&p,l);
3334                 if (x == NULL)
3335                         {
3336                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
3337                         goto err;
3338                         }
3339                 if (p != (q+l))
3340                         {
3341                         al=SSL_AD_DECODE_ERROR;
3342                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
3343                         goto f_err;
3344                         }
3345                 if (!sk_X509_push(sk,x))
3346                         {
3347                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
3348                         goto err;
3349                         }
3350                 x=NULL;
3351                 nc+=l+3;
3352                 }
3353
3354         if (sk_X509_num(sk) <= 0)
3355                 {
3356                 /* TLS does not mind 0 certs returned */
3357                 if (s->version == SSL3_VERSION)
3358                         {
3359                         al=SSL_AD_HANDSHAKE_FAILURE;
3360                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
3361                         goto f_err;
3362                         }
3363                 /* Fail for TLS only if we required a certificate */
3364                 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
3365                          (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
3366                         {
3367                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
3368                         al=SSL_AD_HANDSHAKE_FAILURE;
3369                         goto f_err;
3370                         }
3371                 /* No client certificate so digest cached records */
3372                 if (s->s3->handshake_buffer && !ssl3_digest_cached_records(s))
3373                         {
3374                         al=SSL_AD_INTERNAL_ERROR;
3375                         goto f_err;
3376                         }
3377                 }
3378         else
3379                 {
3380                 i=ssl_verify_cert_chain(s,sk);
3381                 if (i <= 0)
3382                         {
3383                         al=ssl_verify_alarm_type(s->verify_result);
3384                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
3385                         goto f_err;
3386                         }
3387                 }
3388
3389         if (s->session->peer != NULL) /* This should not be needed */
3390                 X509_free(s->session->peer);
3391         s->session->peer=sk_X509_shift(sk);
3392         s->session->verify_result = s->verify_result;
3393
3394         /* With the current implementation, sess_cert will always be NULL
3395          * when we arrive here. */
3396         if (s->session->sess_cert == NULL)
3397                 {
3398                 s->session->sess_cert = ssl_sess_cert_new();
3399                 if (s->session->sess_cert == NULL)
3400                         {
3401                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
3402                         goto err;
3403                         }
3404                 }
3405         if (s->session->sess_cert->cert_chain != NULL)
3406                 sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free);
3407         s->session->sess_cert->cert_chain=sk;
3408         /* Inconsistency alert: cert_chain does *not* include the
3409          * peer's own certificate, while we do include it in s3_clnt.c */
3410
3411         sk=NULL;
3412
3413         ret=1;
3414         if (0)
3415                 {
3416 f_err:
3417                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
3418                 }
3419 err:
3420         if (x != NULL) X509_free(x);
3421         if (sk != NULL) sk_X509_pop_free(sk,X509_free);
3422         return(ret);
3423         }
3424
3425 int ssl3_send_server_certificate(SSL *s)
3426         {
3427         CERT_PKEY *cpk;
3428
3429         if (s->state == SSL3_ST_SW_CERT_A)
3430                 {
3431                 cpk=ssl_get_server_send_pkey(s);
3432                 if (cpk == NULL)
3433                         {
3434                         /* VRS: allow null cert if auth == KRB5 */
3435                         if ((s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5) ||
3436                             (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5))
3437                                 {
3438                                 SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
3439                                 return(0);
3440                                 }
3441                         }
3442
3443                 ssl3_output_cert_chain(s,cpk);
3444                 s->state=SSL3_ST_SW_CERT_B;
3445                 }
3446
3447         /* SSL3_ST_SW_CERT_B */
3448         return ssl_do_write(s);
3449         }
3450
3451 #ifndef OPENSSL_NO_TLSEXT
3452 /* send a new session ticket (not necessarily for a new session) */
3453 int ssl3_send_newsession_ticket(SSL *s)
3454         {
3455         if (s->state == SSL3_ST_SW_SESSION_TICKET_A)
3456                 {
3457                 unsigned char *p, *senc, *macstart;
3458                 const unsigned char *const_p;
3459                 int len, slen_full, slen;
3460                 SSL_SESSION *sess;
3461                 unsigned int hlen;
3462                 EVP_CIPHER_CTX ctx;
3463                 HMAC_CTX hctx;
3464                 SSL_CTX *tctx = s->initial_ctx;
3465                 unsigned char iv[EVP_MAX_IV_LENGTH];
3466                 unsigned char key_name[16];
3467
3468                 /* get session encoding length */
3469                 slen_full = i2d_SSL_SESSION(s->session, NULL);
3470                 /* Some length values are 16 bits, so forget it if session is
3471                  * too long
3472                  */
3473                 if (slen_full > 0xFF00)
3474                         return -1;
3475                 senc = OPENSSL_malloc(slen_full);
3476                 if (!senc)
3477                         return -1;
3478                 p = senc;
3479                 i2d_SSL_SESSION(s->session, &p);
3480
3481                 /* create a fresh copy (not shared with other threads) to clean up */
3482                 const_p = senc;
3483                 sess = d2i_SSL_SESSION(NULL, &const_p, slen_full);
3484                 if (sess == NULL)
3485                         {
3486                         OPENSSL_free(senc);
3487                         return -1;
3488                         }
3489                 sess->session_id_length = 0; /* ID is irrelevant for the ticket */
3490
3491                 slen = i2d_SSL_SESSION(sess, NULL);
3492                 if (slen > slen_full) /* shouldn't ever happen */
3493                         {
3494                         OPENSSL_free(senc);
3495                         return -1;
3496                         }
3497                 p = senc;
3498                 i2d_SSL_SESSION(sess, &p);
3499                 SSL_SESSION_free(sess);
3500
3501                 /* Grow buffer if need be: the length calculation is as
3502                  * follows handshake_header_length +
3503                  * 4 (ticket lifetime hint) + 2 (ticket length) +
3504                  * 16 (key name) + max_iv_len (iv length) +
3505                  * session_length + max_enc_block_size (max encrypted session
3506                  * length) + max_md_size (HMAC).
3507                  */
3508                 if (!BUF_MEM_grow(s->init_buf,
3509                         SSL_HM_HEADER_LENGTH(s) + 22 + EVP_MAX_IV_LENGTH +
3510                         EVP_MAX_BLOCK_LENGTH + EVP_MAX_MD_SIZE + slen))
3511                         return -1;
3512                 p = ssl_handshake_start(s);
3513                 EVP_CIPHER_CTX_init(&ctx);
3514                 HMAC_CTX_init(&hctx);
3515                 /* Initialize HMAC and cipher contexts. If callback present
3516                  * it does all the work otherwise use generated values
3517                  * from parent ctx.
3518                  */
3519                 if (tctx->tlsext_ticket_key_cb)
3520                         {
3521                         if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx,
3522                                                          &hctx, 1) < 0)
3523                                 {
3524                                 OPENSSL_free(senc);
3525                                 return -1;
3526                                 }
3527                         }
3528                 else
3529                         {
3530                         RAND_pseudo_bytes(iv, 16);
3531                         EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
3532                                         tctx->tlsext_tick_aes_key, iv);
3533                         HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
3534                                         tlsext_tick_md(), NULL);
3535                         memcpy(key_name, tctx->tlsext_tick_key_name, 16);
3536                         }
3537
3538                 /* Ticket lifetime hint (advisory only):
3539                  * We leave this unspecified for resumed session (for simplicity),
3540                  * and guess that tickets for new sessions will live as long
3541                  * as their sessions. */
3542                 l2n(s->hit ? 0 : s->session->timeout, p);
3543
3544                 /* Skip ticket length for now */
3545                 p += 2;
3546                 /* Output key name */
3547                 macstart = p;
3548                 memcpy(p, key_name, 16);
3549                 p += 16;
3550                 /* output IV */
3551                 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
3552                 p += EVP_CIPHER_CTX_iv_length(&ctx);
3553                 /* Encrypt session data */
3554                 EVP_EncryptUpdate(&ctx, p, &len, senc, slen);
3555                 p += len;
3556                 EVP_EncryptFinal(&ctx, p, &len);
3557                 p += len;
3558                 EVP_CIPHER_CTX_cleanup(&ctx);
3559
3560                 HMAC_Update(&hctx, macstart, p - macstart);
3561                 HMAC_Final(&hctx, p, &hlen);
3562                 HMAC_CTX_cleanup(&hctx);
3563
3564                 p += hlen;
3565                 /* Now write out lengths: p points to end of data written */
3566                 /* Total length */
3567                 len = p - ssl_handshake_start(s);
3568                 ssl_set_handshake_header(s, SSL3_MT_NEWSESSION_TICKET, len);
3569                 /* Skip ticket lifetime hint */
3570                 p = ssl_handshake_start(s) + 4;
3571                 s2n(len - 6, p);
3572                 s->state=SSL3_ST_SW_SESSION_TICKET_B;
3573                 OPENSSL_free(senc);
3574                 }
3575
3576         /* SSL3_ST_SW_SESSION_TICKET_B */
3577         return ssl_do_write(s);
3578         }
3579
3580 int ssl3_send_cert_status(SSL *s)
3581         {
3582         if (s->state == SSL3_ST_SW_CERT_STATUS_A)
3583                 {
3584                 unsigned char *p;
3585                 /* Grow buffer if need be: the length calculation is as
3586                  * follows 1 (message type) + 3 (message length) +
3587                  * 1 (ocsp response type) + 3 (ocsp response length)
3588                  * + (ocsp response)
3589                  */
3590                 if (!BUF_MEM_grow(s->init_buf, 8 + s->tlsext_ocsp_resplen))
3591                         return -1;
3592
3593                 p=(unsigned char *)s->init_buf->data;
3594
3595                 /* do the header */
3596                 *(p++)=SSL3_MT_CERTIFICATE_STATUS;
3597                 /* message length */
3598                 l2n3(s->tlsext_ocsp_resplen + 4, p);
3599                 /* status type */
3600                 *(p++)= s->tlsext_status_type;
3601                 /* length of OCSP response */
3602                 l2n3(s->tlsext_ocsp_resplen, p);
3603                 /* actual response */
3604                 memcpy(p, s->tlsext_ocsp_resp, s->tlsext_ocsp_resplen);
3605                 /* number of bytes to write */
3606                 s->init_num = 8 + s->tlsext_ocsp_resplen;
3607                 s->state=SSL3_ST_SW_CERT_STATUS_B;
3608                 s->init_off = 0;
3609                 }
3610
3611         /* SSL3_ST_SW_CERT_STATUS_B */
3612         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3613         }
3614
3615 # ifndef OPENSSL_NO_NEXTPROTONEG
3616 /* ssl3_get_next_proto reads a Next Protocol Negotiation handshake message. It
3617  * sets the next_proto member in s if found */
3618 int ssl3_get_next_proto(SSL *s)
3619         {
3620         int ok;
3621         int proto_len, padding_len;
3622         long n;
3623         const unsigned char *p;
3624
3625         /* Clients cannot send a NextProtocol message if we didn't see the
3626          * extension in their ClientHello */
3627         if (!s->s3->next_proto_neg_seen)
3628                 {
3629                 SSLerr(SSL_F_SSL3_GET_NEXT_PROTO,SSL_R_GOT_NEXT_PROTO_WITHOUT_EXTENSION);
3630                 return -1;
3631                 }
3632
3633         n=s->method->ssl_get_message(s,
3634                 SSL3_ST_SR_NEXT_PROTO_A,
3635                 SSL3_ST_SR_NEXT_PROTO_B,
3636                 SSL3_MT_NEXT_PROTO,
3637                 514,  /* See the payload format below */
3638                 &ok);
3639
3640         if (!ok)
3641                 return((int)n);
3642
3643         /* s->state doesn't reflect whether ChangeCipherSpec has been received
3644          * in this handshake, but s->s3->change_cipher_spec does (will be reset
3645          * by ssl3_get_finished). */
3646         if (!s->s3->change_cipher_spec)
3647                 {
3648                 SSLerr(SSL_F_SSL3_GET_NEXT_PROTO,SSL_R_GOT_NEXT_PROTO_BEFORE_A_CCS);
3649                 return -1;
3650                 }
3651
3652         if (n < 2)
3653                 return 0;  /* The body must be > 1 bytes long */
3654
3655         p=(unsigned char *)s->init_msg;
3656
3657         /* The payload looks like:
3658          *   uint8 proto_len;
3659          *   uint8 proto[proto_len];
3660          *   uint8 padding_len;
3661          *   uint8 padding[padding_len];
3662          */
3663         proto_len = p[0];
3664         if (proto_len + 2 > s->init_num)
3665                 return 0;
3666         padding_len = p[proto_len + 1];
3667         if (proto_len + padding_len + 2 != s->init_num)
3668                 return 0;
3669
3670         s->next_proto_negotiated = OPENSSL_malloc(proto_len);
3671         if (!s->next_proto_negotiated)
3672                 {
3673                 SSLerr(SSL_F_SSL3_GET_NEXT_PROTO,ERR_R_MALLOC_FAILURE);
3674                 return 0;
3675                 }
3676         memcpy(s->next_proto_negotiated, p + 1, proto_len);
3677         s->next_proto_negotiated_len = proto_len;
3678
3679         return 1;
3680         }
3681 # endif
3682
3683 #endif