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                                         BUF_MEM_free(buf);
 290                                         ret= -1;
 291                                         goto end;
 292                                         }
 293                                 s->init_buf=buf;
 294                                 }
 295
 296                         if (!ssl3_setup_buffers(s))
 297                                 {
 298                                 ret= -1;
 299                                 goto end;
 300                                 }
 301
 302                         s->init_num=0;
 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                         /*
 450                          * clear this, it may get reset by
 451                          * send_server_key_exchange
 452                          */
 453                         s->s3->tmp.use_rsa_tmp=0;
 454
 455
 456                         /* only send if a DH key exchange, fortezza or
 457                          * RSA but we have a sign only certificate
 458                          *
 459                          * PSK: may send PSK identity hints
 460                          *
 461                          * For ECC ciphersuites, we send a serverKeyExchange
 462                          * message only if the cipher suite is either
 463                          * ECDH-anon or ECDHE. In other cases, the
 464                          * server certificate contains the server's
 465                          * public key for key exchange.
 466                          */
 467                         if (0
 468                         /* PSK: send ServerKeyExchange if PSK identity
 469                          * hint if provided */
 470 #ifndef OPENSSL_NO_PSK
 471                             || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
 472 #endif
 473 #ifndef OPENSSL_NO_SRP
 474                             /* SRP: send ServerKeyExchange */
 475                             || (alg_k & SSL_kSRP)
 476 #endif
 477                             || (alg_k & SSL_kEDH)
 478                             || (alg_k & SSL_kEECDH)
 479                             || ((alg_k & SSL_kRSA)
 480                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
 481                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
 482                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
 483                                         )
 484                                     )
 485                                 )
 486                             )
 487                                 {
 488                                 ret=ssl3_send_server_key_exchange(s);
 489                                 if (ret <= 0) goto end;
 490                                 }
 491                         else
 492                                 skip=1;
 493
 494                         s->state=SSL3_ST_SW_CERT_REQ_A;
 495                         s->init_num=0;
 496                         break;
 497
 498                 case SSL3_ST_SW_CERT_REQ_A:
 499                 case SSL3_ST_SW_CERT_REQ_B:
 500                         if (/* don't request cert unless asked for it: */
 501                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
 502                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
 503                                  * don't request cert during re-negotiation: */
 504                                 ((s->session->peer != NULL) &&
 505                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
 506                                 /* never request cert in anonymous ciphersuites
 507                                  * (see section "Certificate request" in SSL 3 drafts
 508                                  * and in RFC 2246): */
 509                                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
 510                                  /* ... except when the application insists on verification
 511                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
 512                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
 513                                  /* never request cert in Kerberos ciphersuites */
 514                                 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5) ||
 515                                 /* don't request certificate for SRP auth */
 516                                 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aSRP)
 517                                 /* With normal PSK Certificates and
 518                                  * Certificate Requests are omitted */
 519                                 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 520                                 {
 521                                 /* no cert request */
 522                                 skip=1;
 523                                 s->s3->tmp.cert_request=0;
 524                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 525                                 if (s->s3->handshake_buffer)
 526                                         if (!ssl3_digest_cached_records(s))
 527                                                 return -1;
 528                                 }
 529                         else
 530                                 {
 531                                 s->s3->tmp.cert_request=1;
 532                                 ret=ssl3_send_certificate_request(s);
 533                                 if (ret <= 0) goto end;
 534 #ifndef NETSCAPE_HANG_BUG
 535                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 536 #else
 537                                 s->state=SSL3_ST_SW_FLUSH;
 538                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 539 #endif
 540                                 s->init_num=0;
 541                                 }
 542                         break;
 543
 544                 case SSL3_ST_SW_SRVR_DONE_A:
 545                 case SSL3_ST_SW_SRVR_DONE_B:
 546                         ret=ssl3_send_server_done(s);
 547                         if (ret <= 0) goto end;
 548                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 549                         s->state=SSL3_ST_SW_FLUSH;
 550                         s->init_num=0;
 551                         break;
 552
 553                 case SSL3_ST_SW_FLUSH:
 554
 555                         /* This code originally checked to see if
 556                          * any data was pending using BIO_CTRL_INFO
 557                          * and then flushed. This caused problems
 558                          * as documented in PR#1939. The proposed
 559                          * fix doesn't completely resolve this issue
 560                          * as buggy implementations of BIO_CTRL_PENDING
 561                          * still exist. So instead we just flush
 562                          * unconditionally.
 563                          */
 564
 565                         s->rwstate=SSL_WRITING;
 566                         if (BIO_flush(s->wbio) <= 0)
 567                                 {
 568                                 ret= -1;
 569                                 goto end;
 570                                 }
 571                         s->rwstate=SSL_NOTHING;
 572
 573                         s->state=s->s3->tmp.next_state;
 574                         break;
 575
 576                 case SSL3_ST_SR_CERT_A:
 577                 case SSL3_ST_SR_CERT_B:
 578                         if (s->s3->tmp.cert_request)
 579                                 {
 580                                 ret=ssl3_get_client_certificate(s);
 581                                 if (ret <= 0) goto end;
 582                                 }
 583                         s->init_num=0;
 584                         s->state=SSL3_ST_SR_KEY_EXCH_A;
 585                         break;
 586
 587                 case SSL3_ST_SR_KEY_EXCH_A:
 588                 case SSL3_ST_SR_KEY_EXCH_B:
 589                         ret=ssl3_get_client_key_exchange(s);
 590                         if (ret <= 0)
 591                                 goto end;
 592                         if (ret == 2)
 593                                 {
 594                                 /* For the ECDH ciphersuites when
 595                                  * the client sends its ECDH pub key in
 596                                  * a certificate, the CertificateVerify
 597                                  * message is not sent.
 598                                  * Also for GOST ciphersuites when
 599                                  * the client uses its key from the certificate
 600                                  * for key exchange.
 601                                  */
 602 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
 603                                 s->state=SSL3_ST_SR_FINISHED_A;
 604 #else
 605                                 if (s->s3->next_proto_neg_seen)
 606                                         s->state=SSL3_ST_SR_NEXT_PROTO_A;
 607                                 else
 608                                         s->state=SSL3_ST_SR_FINISHED_A;
 609 #endif
 610                                 s->init_num = 0;
 611                                 }
 612                         else if (SSL_USE_SIGALGS(s))
 613                                 {
 614                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
 615                                 s->init_num=0;
 616                                 if (!s->session->peer)
 617                                         break;
 618                                 /* For sigalgs freeze the handshake buffer
 619                                  * at this point and digest cached records.
 620                                  */
 621                                 if (!s->s3->handshake_buffer)
 622                                         {
 623                                         SSLerr(SSL_F_SSL3_ACCEPT,ERR_R_INTERNAL_ERROR);
 624                                         return -1;
 625                                         }
 626                                 s->s3->flags |= TLS1_FLAGS_KEEP_HANDSHAKE;
 627                                 if (!ssl3_digest_cached_records(s))
 628                                         return -1;
 629                                 }
 630                         else
 631                                 {
 632                                 int offset=0;
 633                                 int dgst_num;
 634
 635                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
 636                                 s->init_num=0;
 637
 638                                 /* We need to get hashes here so if there is
 639                                  * a client cert, it can be verified
 640                                  * FIXME - digest processing for CertificateVerify
 641                                  * should be generalized. But it is next step
 642                                  */
 643                                 if (s->s3->handshake_buffer)
 644                                         if (!ssl3_digest_cached_records(s))
 645                                                 return -1;
 646                                 for (dgst_num=0; dgst_num<SSL_MAX_DIGEST;dgst_num++)
 647                                         if (s->s3->handshake_dgst[dgst_num])
 648                                                 {
 649                                                 int dgst_size;
 650
 651                                                 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]));
 652                                                 dgst_size=EVP_MD_CTX_size(s->s3->handshake_dgst[dgst_num]);
 653                                                 if (dgst_size < 0)
 654                                                         {
 655                                                         ret = -1;
 656                                                         goto end;
 657                                                         }
 658                                                 offset+=dgst_size;
 659                                                 }
 660                                 }
 661                         break;
 662
 663                 case SSL3_ST_SR_CERT_VRFY_A:
 664                 case SSL3_ST_SR_CERT_VRFY_B:
 665                         /*
 666                          * This *should* be the first time we enable CCS, but be
 667                          * extra careful about surrounding code changes. We need
 668                          * to set this here because we don't know if we're
 669                          * expecting a CertificateVerify or not.
 670                          */
 671                         if (!s->s3->change_cipher_spec)
 672                                 s->s3->flags |= SSL3_FLAGS_CCS_OK;
 673                         /* we should decide if we expected this one */
 674                         ret=ssl3_get_cert_verify(s);
 675                         if (ret <= 0) goto end;
 676
 677 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
 678                         s->state=SSL3_ST_SR_FINISHED_A;
 679 #else
 680                         if (s->s3->next_proto_neg_seen)
 681                                 s->state=SSL3_ST_SR_NEXT_PROTO_A;
 682                         else
 683                                 s->state=SSL3_ST_SR_FINISHED_A;
 684 #endif
 685                         s->init_num=0;
 686                         break;
 687
 688 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
 689                 case SSL3_ST_SR_NEXT_PROTO_A:
 690                 case SSL3_ST_SR_NEXT_PROTO_B:
 691                         /*
 692                          * Enable CCS for resumed handshakes with NPN.
 693                          * In a full handshake with NPN, we end up here through
 694                          * SSL3_ST_SR_CERT_VRFY_B, where SSL3_FLAGS_CCS_OK was
 695                          * already set. Receiving a CCS clears the flag, so make
 696                          * sure not to re-enable it to ban duplicates.
 697                          * s->s3->change_cipher_spec is set when a CCS is
 698                          * processed in s3_pkt.c, and remains set until
 699                          * the client's Finished message is read.
 700                          */
 701                         if (!s->s3->change_cipher_spec)
 702                                 s->s3->flags |= SSL3_FLAGS_CCS_OK;
 703
 704                         ret=ssl3_get_next_proto(s);
 705                         if (ret <= 0) goto end;
 706                         s->init_num = 0;
 707                         s->state=SSL3_ST_SR_FINISHED_A;
 708                         break;
 709 #endif
 710
 711                 case SSL3_ST_SR_FINISHED_A:
 712                 case SSL3_ST_SR_FINISHED_B:
 713                         /*
 714                          * Enable CCS for resumed handshakes without NPN.
 715                          * In a full handshake, we end up here through
 716                          * SSL3_ST_SR_CERT_VRFY_B, where SSL3_FLAGS_CCS_OK was
 717                          * already set. Receiving a CCS clears the flag, so make
 718                          * sure not to re-enable it to ban duplicates.
 719                          * s->s3->change_cipher_spec is set when a CCS is
 720                          * processed in s3_pkt.c, and remains set until
 721                          * the client's Finished message is read.
 722                          */
 723                         if (!s->s3->change_cipher_spec)
 724                                 s->s3->flags |= SSL3_FLAGS_CCS_OK;
 725                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
 726                                 SSL3_ST_SR_FINISHED_B);
 727                         if (ret <= 0) goto end;
 728                         if (s->hit)
 729                                 s->state=SSL_ST_OK;
 730 #ifndef OPENSSL_NO_TLSEXT
 731                         else if (s->tlsext_ticket_expected)
 732                                 s->state=SSL3_ST_SW_SESSION_TICKET_A;
 733 #endif
 734                         else
 735                                 s->state=SSL3_ST_SW_CHANGE_A;
 736                         s->init_num=0;
 737                         break;
 738
 739 #ifndef OPENSSL_NO_TLSEXT
 740                 case SSL3_ST_SW_SESSION_TICKET_A:
 741                 case SSL3_ST_SW_SESSION_TICKET_B:
 742                         ret=ssl3_send_newsession_ticket(s);
 743                         if (ret <= 0) goto end;
 744                         s->state=SSL3_ST_SW_CHANGE_A;
 745                         s->init_num=0;
 746                         break;
 747
 748                 case SSL3_ST_SW_CERT_STATUS_A:
 749                 case SSL3_ST_SW_CERT_STATUS_B:
 750                         ret=ssl3_send_cert_status(s);
 751                         if (ret <= 0) goto end;
 752                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 753                         s->init_num=0;
 754                         break;
 755
 756 #endif
 757
 758                 case SSL3_ST_SW_CHANGE_A:
 759                 case SSL3_ST_SW_CHANGE_B:
 760
 761                         s->session->cipher=s->s3->tmp.new_cipher;
 762                         if (!s->method->ssl3_enc->setup_key_block(s))
 763                                 { ret= -1; goto end; }
 764
 765                         ret=ssl3_send_change_cipher_spec(s,
 766                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
 767
 768                         if (ret <= 0) goto end;
 769                         s->state=SSL3_ST_SW_FINISHED_A;
 770                         s->init_num=0;
 771
 772                         if (!s->method->ssl3_enc->change_cipher_state(s,
 773                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
 774                                 {
 775                                 ret= -1;
 776                                 goto end;
 777                                 }
 778
 779                         break;
 780
 781                 case SSL3_ST_SW_FINISHED_A:
 782                 case SSL3_ST_SW_FINISHED_B:
 783                         ret=ssl3_send_finished(s,
 784                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
 785                                 s->method->ssl3_enc->server_finished_label,
 786                                 s->method->ssl3_enc->server_finished_label_len);
 787                         if (ret <= 0) goto end;
 788                         s->state=SSL3_ST_SW_FLUSH;
 789                         if (s->hit)
 790                                 {
 791 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
 792                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 793 #else
 794                                 if (s->s3->next_proto_neg_seen)
 795                                         {
 796                                         s->s3->tmp.next_state=SSL3_ST_SR_NEXT_PROTO_A;
 797                                         }
 798                                 else
 799                                         s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 800 #endif
 801                                 }
 802                         else
 803                                 s->s3->tmp.next_state=SSL_ST_OK;
 804                         s->init_num=0;
 805                         break;
 806
 807                 case SSL_ST_OK:
 808                         /* clean a few things up */
 809                         ssl3_cleanup_key_block(s);
 810
 811                         BUF_MEM_free(s->init_buf);
 812                         s->init_buf=NULL;
 813
 814                         /* remove buffering on output */
 815                         ssl_free_wbio_buffer(s);
 816
 817                         s->init_num=0;
 818
 819                         if (s->renegotiate == 2) /* skipped if we just sent a HelloRequest */
 820                                 {
 821                                 s->renegotiate=0;
 822                                 s->new_session=0;
 823
 824                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 825
 826                                 s->ctx->stats.sess_accept_good++;
 827                                 /* s->server=1; */
 828                                 s->handshake_func=ssl3_accept;
 829
 830                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 831                                 }
 832
 833                         ret = 1;
 834                         goto end;
 835                         /* break; */
 836
 837                 default:
 838                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
 839                         ret= -1;
 840                         goto end;
 841                         /* break; */
 842                         }
 843
 844                 if (!s->s3->tmp.reuse_message && !skip)
 845                         {
 846                         if (s->debug)
 847                                 {
 848                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 849                                         goto end;
 850                                 }
 851
 852
 853                         if ((cb != NULL) && (s->state != state))
 854                                 {
 855                                 new_state=s->state;
 856                                 s->state=state;
 857                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
 858                                 s->state=new_state;
 859                                 }
 860                         }
 861                 skip=0;
 862                 }
 863 end:
 864         /* BIO_flush(s->wbio); */
 865
 866         s->in_handshake--;
 867         if (cb != NULL)
 868                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 869         return(ret);
 870         }
 871
 872 int ssl3_send_hello_request(SSL *s)
 873         {
 874
 875         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
 876                 {
 877                 ssl_set_handshake_header(s, SSL3_MT_HELLO_REQUEST, 0);
 878                 s->state=SSL3_ST_SW_HELLO_REQ_B;
 879                 }
 880
 881         /* SSL3_ST_SW_HELLO_REQ_B */
 882         return ssl_do_write(s);
 883         }
 884
 885 int ssl3_get_client_hello(SSL *s)
 886         {
 887         int i,j,ok,al=SSL_AD_INTERNAL_ERROR,ret= -1;
 888         unsigned int cookie_len;
 889         long n;
 890         unsigned long id;
 891         unsigned char *p,*d;
 892         SSL_CIPHER *c;
 893 #ifndef OPENSSL_NO_COMP
 894         unsigned char *q;
 895         SSL_COMP *comp=NULL;
 896 #endif
 897         STACK_OF(SSL_CIPHER) *ciphers=NULL;
 898
 899         if (s->state == SSL3_ST_SR_CLNT_HELLO_C && !s->first_packet)
 900                 goto retry_cert;
 901
 902         /* We do this so that we will respond with our native type.
 903          * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
 904          * This down switching should be handled by a different method.
 905          * If we are SSLv3, we will respond with SSLv3, even if prompted with
 906          * TLSv1.
 907          */
 908         if (s->state == SSL3_ST_SR_CLNT_HELLO_A
 909                 )
 910                 {
 911                 s->state=SSL3_ST_SR_CLNT_HELLO_B;
 912                 }
 913         s->first_packet=1;
 914         n=s->method->ssl_get_message(s,
 915                 SSL3_ST_SR_CLNT_HELLO_B,
 916                 SSL3_ST_SR_CLNT_HELLO_C,
 917                 SSL3_MT_CLIENT_HELLO,
 918                 SSL3_RT_MAX_PLAIN_LENGTH,
 919                 &ok);
 920
 921         if (!ok) return((int)n);
 922         s->first_packet=0;
 923         d=p=(unsigned char *)s->init_msg;
 924
 925         /* use version from inside client hello, not from record header
 926          * (may differ: see RFC 2246, Appendix E, second paragraph) */
 927         s->client_version=(((int)p[0])<<8)|(int)p[1];
 928         p+=2;
 929
 930         if (SSL_IS_DTLS(s)  ?   (s->client_version > s->version &&
 931                                  s->method->version != DTLS_ANY_VERSION)
 932                             :   (s->client_version < s->version))
 933                 {
 934                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER);
 935                 if ((s->client_version>>8) == SSL3_VERSION_MAJOR &&
 936                         !s->enc_write_ctx && !s->write_hash)
 937                         {
 938                         /* similar to ssl3_get_record, send alert using remote version number */
 939                         s->version = s->client_version;
 940                         }
 941                 al = SSL_AD_PROTOCOL_VERSION;
 942                 goto f_err;
 943                 }
 944
 945         /* If we require cookies and this ClientHello doesn't
 946          * contain one, just return since we do not want to
 947          * allocate any memory yet. So check cookie length...
 948          */
 949         if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)
 950                 {
 951                 unsigned int session_length, cookie_length;
 952
 953                 session_length = *(p + SSL3_RANDOM_SIZE);
 954                 cookie_length = *(p + SSL3_RANDOM_SIZE + session_length + 1);
 955
 956                 if (cookie_length == 0)
 957                         return 1;
 958                 }
 959
 960         /* load the client random */
 961         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
 962         p+=SSL3_RANDOM_SIZE;
 963
 964         /* get the session-id */
 965         j= *(p++);
 966
 967         s->hit=0;
 968         /* Versions before 0.9.7 always allow clients to resume sessions in renegotiation.
 969          * 0.9.7 and later allow this by default, but optionally ignore resumption requests
 970          * with flag SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION (it's a new flag rather
 971          * than a change to default behavior so that applications relying on this for security
 972          * won't even compile against older library versions).
 973          *
 974          * 1.0.1 and later also have a function SSL_renegotiate_abbreviated() to request
 975          * renegotiation but not a new session (s->new_session remains unset): for servers,
 976          * this essentially just means that the SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
 977          * setting will be ignored.
 978          */
 979         if ((s->new_session && (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION)))
 980                 {
 981                 if (!ssl_get_new_session(s,1))
 982                         goto err;
 983                 }
 984         else
 985                 {
 986                 i=ssl_get_prev_session(s, p, j, d + n);
 987                 /*
 988                  * Only resume if the session's version matches the negotiated
 989                  * version.
 990                  * RFC 5246 does not provide much useful advice on resumption
 991                  * with a different protocol version. It doesn't forbid it but
 992                  * the sanity of such behaviour would be questionable.
 993                  * In practice, clients do not accept a version mismatch and
 994                  * will abort the handshake with an error.
 995                  */
 996                 if (i == 1 && s->version == s->session->ssl_version)
 997                         { /* previous session */
 998                         s->hit=1;
 999                         }
1000                 else if (i == -1)
1001                         goto err;
1002                 else /* i == 0 */
1003                         {
1004                         if (!ssl_get_new_session(s,1))
1005                                 goto err;
1006                         }
1007                 }
1008
1009         p+=j;
1010
1011         if (SSL_IS_DTLS(s))
1012                 {
1013                 /* cookie stuff */
1014                 cookie_len = *(p++);
1015
1016                 /*
1017                  * The ClientHello may contain a cookie even if the
1018                  * HelloVerify message has not been sent--make sure that it
1019                  * does not cause an overflow.
1020                  */
1021                 if ( cookie_len > sizeof(s->d1->rcvd_cookie))
1022                         {
1023                         /* too much data */
1024                         al = SSL_AD_DECODE_ERROR;
1025                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
1026                         goto f_err;
1027                         }
1028
1029                 /* verify the cookie if appropriate option is set. */
1030                 if ((SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) &&
1031                         cookie_len > 0)
1032                         {
1033                         memcpy(s->d1->rcvd_cookie, p, cookie_len);
1034
1035                         if ( s->ctx->app_verify_cookie_cb != NULL)
1036                                 {
1037                                 if ( s->ctx->app_verify_cookie_cb(s, s->d1->rcvd_cookie,
1038                                         cookie_len) == 0)
1039                                         {
1040                                         al=SSL_AD_HANDSHAKE_FAILURE;
1041                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
1042                                                 SSL_R_COOKIE_MISMATCH);
1043                                         goto f_err;
1044                                         }
1045                                 /* else cookie verification succeeded */
1046                                 }
1047                         /* default verification */
1048                         else if ( memcmp(s->d1->rcvd_cookie, s->d1->cookie,
1049                                                   s->d1->cookie_len) != 0)
1050                                 {
1051                                         al=SSL_AD_HANDSHAKE_FAILURE;
1052                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
1053                                                 SSL_R_COOKIE_MISMATCH);
1054                                         goto f_err;
1055                                 }
1056                         /* Set to -2 so if successful we return 2 */
1057                         ret = -2;
1058                         }
1059
1060                 p += cookie_len;
1061                 if (s->method->version == DTLS_ANY_VERSION)
1062                         {
1063                         /* Select version to use */
1064                         if (s->client_version <= DTLS1_2_VERSION &&
1065                                 !(s->options & SSL_OP_NO_DTLSv1_2))
1066                                 {
1067                                 s->version = DTLS1_2_VERSION;
1068                                 s->method = DTLSv1_2_server_method();
1069                                 }
1070                         else if (tls1_suiteb(s))
1071                                 {
1072                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_ONLY_DTLS_1_2_ALLOWED_IN_SUITEB_MODE);
1073                                 s->version = s->client_version;
1074                                 al = SSL_AD_PROTOCOL_VERSION;
1075                                 goto f_err;
1076                                 }
1077                         else if (s->client_version <= DTLS1_VERSION &&
1078                                 !(s->options & SSL_OP_NO_DTLSv1))
1079                                 {
1080                                 s->version = DTLS1_VERSION;
1081                                 s->method = DTLSv1_server_method();
1082                                 }
1083                         else
1084                                 {
1085                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER);
1086                                 s->version = s->client_version;
1087                                 al = SSL_AD_PROTOCOL_VERSION;
1088                                 goto f_err;
1089                                 }
1090                         s->session->ssl_version = s->version;
1091                         }
1092                 }
1093
1094         n2s(p,i);
1095         if ((i == 0) && (j != 0))
1096                 {
1097                 /* we need a cipher if we are not resuming a session */
1098                 al=SSL_AD_ILLEGAL_PARAMETER;
1099                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
1100                 goto f_err;
1101                 }
1102         if ((p+i) >= (d+n))
1103                 {
1104                 /* not enough data */
1105                 al=SSL_AD_DECODE_ERROR;
1106                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
1107                 goto f_err;
1108                 }
1109         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
1110                 == NULL))
1111                 {
1112                 goto err;
1113                 }
1114         p+=i;
1115
1116         /* If it is a hit, check that the cipher is in the list */
1117         if ((s->hit) && (i > 0))
1118                 {
1119                 j=0;
1120                 id=s->session->cipher->id;
1121
1122 #ifdef CIPHER_DEBUG
1123                 fprintf(stderr,"client sent %d ciphers\n",sk_SSL_CIPHER_num(ciphers));
1124 #endif
1125                 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
1126                         {
1127                         c=sk_SSL_CIPHER_value(ciphers,i);
1128 #ifdef CIPHER_DEBUG
1129                         fprintf(stderr,"client [%2d of %2d]:%s\n",
1130                                 i,sk_SSL_CIPHER_num(ciphers),
1131                                 SSL_CIPHER_get_name(c));
1132 #endif
1133                         if (c->id == id)
1134                                 {
1135                                 j=1;
1136                                 break;
1137                                 }
1138                         }
1139 /* Disabled because it can be used in a ciphersuite downgrade
1140  * attack: CVE-2010-4180.
1141  */
1142 #if 0
1143                 if (j == 0 && (s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
1144                         {
1145                         /* Special case as client bug workaround: the previously used cipher may
1146                          * not be in the current list, the client instead might be trying to
1147                          * continue using a cipher that before wasn't chosen due to server
1148                          * preferences.  We'll have to reject the connection if the cipher is not
1149                          * enabled, though. */
1150                         c = sk_SSL_CIPHER_value(ciphers, 0);
1151                         if (sk_SSL_CIPHER_find(SSL_get_ciphers(s), c) >= 0)
1152                                 {
1153                                 s->session->cipher = c;
1154                                 j = 1;
1155                                 }
1156                         }
1157 #endif
1158                 if (j == 0)
1159                         {
1160                         /* we need to have the cipher in the cipher
1161                          * list if we are asked to reuse it */
1162                         al=SSL_AD_ILLEGAL_PARAMETER;
1163                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
1164                         goto f_err;
1165                         }
1166                 }
1167
1168         /* compression */
1169         i= *(p++);
1170         if ((p+i) > (d+n))
1171                 {
1172                 /* not enough data */
1173                 al=SSL_AD_DECODE_ERROR;
1174                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
1175                 goto f_err;
1176                 }
1177 #ifndef OPENSSL_NO_COMP
1178         q=p;
1179 #endif
1180         for (j=0; j<i; j++)
1181                 {
1182                 if (p[j] == 0) break;
1183                 }
1184
1185         p+=i;
1186         if (j >= i)
1187                 {
1188                 /* no compress */
1189                 al=SSL_AD_DECODE_ERROR;
1190                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
1191                 goto f_err;
1192                 }
1193
1194 #ifndef OPENSSL_NO_TLSEXT
1195         /* TLS extensions*/
1196         if (s->version >= SSL3_VERSION)
1197                 {
1198                 if (!ssl_parse_clienthello_tlsext(s,&p,d,n))
1199                         {
1200                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_PARSE_TLSEXT);
1201                         goto err;
1202                         }
1203                 }
1204
1205         /* Check if we want to use external pre-shared secret for this
1206          * handshake for not reused session only. We need to generate
1207          * server_random before calling tls_session_secret_cb in order to allow
1208          * SessionTicket processing to use it in key derivation. */
1209         {
1210                 unsigned char *pos;
1211                 pos=s->s3->server_random;
1212                 if (ssl_fill_hello_random(s, 1, pos, SSL3_RANDOM_SIZE) <= 0)
1213                         {
1214                         goto f_err;
1215                         }
1216         }
1217
1218         if (!s->hit && s->version >= TLS1_VERSION && s->tls_session_secret_cb)
1219                 {
1220                 SSL_CIPHER *pref_cipher=NULL;
1221
1222                 s->session->master_key_length=sizeof(s->session->master_key);
1223                 if(s->tls_session_secret_cb(s, s->session->master_key, &s->session->master_key_length,
1224                         ciphers, &pref_cipher, s->tls_session_secret_cb_arg))
1225                         {
1226                         s->hit=1;
1227                         s->session->ciphers=ciphers;
1228                         s->session->verify_result=X509_V_OK;
1229
1230                         ciphers=NULL;
1231
1232                         /* check if some cipher was preferred by call back */
1233                         pref_cipher=pref_cipher ? pref_cipher : ssl3_choose_cipher(s, s->session->ciphers, SSL_get_ciphers(s));
1234                         if (pref_cipher == NULL)
1235                                 {
1236                                 al=SSL_AD_HANDSHAKE_FAILURE;
1237                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1238                                 goto f_err;
1239                                 }
1240
1241                         s->session->cipher=pref_cipher;
1242
1243                         if (s->cipher_list)
1244                                 sk_SSL_CIPHER_free(s->cipher_list);
1245
1246                         if (s->cipher_list_by_id)
1247                                 sk_SSL_CIPHER_free(s->cipher_list_by_id);
1248
1249                         s->cipher_list = sk_SSL_CIPHER_dup(s->session->ciphers);
1250                         s->cipher_list_by_id = sk_SSL_CIPHER_dup(s->session->ciphers);
1251                         }
1252                 }
1253 #endif
1254
1255         /* Worst case, we will use the NULL compression, but if we have other
1256          * options, we will now look for them.  We have i-1 compression
1257          * algorithms from the client, starting at q. */
1258         s->s3->tmp.new_compression=NULL;
1259 #ifndef OPENSSL_NO_COMP
1260         /* This only happens if we have a cache hit */
1261         if (s->session->compress_meth != 0)
1262                 {
1263                 int m, comp_id = s->session->compress_meth;
1264                 /* Perform sanity checks on resumed compression algorithm */
1265                 /* Can't disable compression */
1266                 if (s->options & SSL_OP_NO_COMPRESSION)
1267                         {
1268                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1269                         goto f_err;
1270                         }
1271                 /* Look for resumed compression method */
1272                 for (m = 0; m < sk_SSL_COMP_num(s->ctx->comp_methods); m++)
1273                         {
1274                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1275                         if (comp_id == comp->id)
1276                                 {
1277                                 s->s3->tmp.new_compression=comp;
1278                                 break;
1279                                 }
1280                         }
1281                 if (s->s3->tmp.new_compression == NULL)
1282                         {
1283                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INVALID_COMPRESSION_ALGORITHM);
1284                         goto f_err;
1285                         }
1286                 /* Look for resumed method in compression list */
1287                 for (m = 0; m < i; m++)
1288                         {
1289                         if (q[m] == comp_id)
1290                                 break;
1291                         }
1292                 if (m >= i)
1293                         {
1294                         al=SSL_AD_ILLEGAL_PARAMETER;
1295                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_COMPRESSSION_ALGORITHM_MISSING);
1296                         goto f_err;
1297                         }
1298                 }
1299         else if (s->hit)
1300                 comp = NULL;
1301         else if (!(s->options & SSL_OP_NO_COMPRESSION) && s->ctx->comp_methods)
1302                 {
1303                 /* See if we have a match */
1304                 int m,nn,o,v,done=0;
1305
1306                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
1307                 for (m=0; m<nn; m++)
1308                         {
1309                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1310                         v=comp->id;
1311                         for (o=0; o<i; o++)
1312                                 {
1313                                 if (v == q[o])
1314                                         {
1315                                         done=1;
1316                                         break;
1317                                         }
1318                                 }
1319                         if (done) break;
1320                         }
1321                 if (done)
1322                         s->s3->tmp.new_compression=comp;
1323                 else
1324                         comp=NULL;
1325                 }
1326 #else
1327         /* If compression is disabled we'd better not try to resume a session
1328          * using compression.
1329          */
1330         if (s->session->compress_meth != 0)
1331                 {
1332                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1333                 goto f_err;
1334                 }
1335 #endif
1336
1337         /* Given s->session->ciphers and SSL_get_ciphers, we must
1338          * pick a cipher */
1339
1340         if (!s->hit)
1341                 {
1342 #ifdef OPENSSL_NO_COMP
1343                 s->session->compress_meth=0;
1344 #else
1345                 s->session->compress_meth=(comp == NULL)?0:comp->id;
1346 #endif
1347                 if (s->session->ciphers != NULL)
1348                         sk_SSL_CIPHER_free(s->session->ciphers);
1349                 s->session->ciphers=ciphers;
1350                 if (ciphers == NULL)
1351                         {
1352                         al=SSL_AD_ILLEGAL_PARAMETER;
1353                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
1354                         goto f_err;
1355                         }
1356                 ciphers=NULL;
1357                 if (!tls1_set_server_sigalgs(s))
1358                         {
1359                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT);
1360                         goto err;
1361                         }
1362                 /* Let cert callback update server certificates if required */
1363                 retry_cert:
1364                 if (s->cert->cert_cb)
1365                         {
1366                         int rv = s->cert->cert_cb(s, s->cert->cert_cb_arg);
1367                         if (rv == 0)
1368                                 {
1369                                 al=SSL_AD_INTERNAL_ERROR;
1370                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_CERT_CB_ERROR);
1371                                 goto f_err;
1372                                 }
1373                         if (rv < 0)
1374                                 {
1375                                 s->rwstate=SSL_X509_LOOKUP;
1376                                 return -1;
1377                                 }
1378                         s->rwstate = SSL_NOTHING;
1379                         }
1380                 c=ssl3_choose_cipher(s,s->session->ciphers,
1381                                      SSL_get_ciphers(s));
1382
1383                 if (c == NULL)
1384                         {
1385                         al=SSL_AD_HANDSHAKE_FAILURE;
1386                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1387                         goto f_err;
1388                         }
1389                 s->s3->tmp.new_cipher=c;
1390                 }
1391         else
1392                 {
1393                 /* Session-id reuse */
1394 #ifdef REUSE_CIPHER_BUG
1395                 STACK_OF(SSL_CIPHER) *sk;
1396                 SSL_CIPHER *nc=NULL;
1397                 SSL_CIPHER *ec=NULL;
1398
1399                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
1400                         {
1401                         sk=s->session->ciphers;
1402                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
1403                                 {
1404                                 c=sk_SSL_CIPHER_value(sk,i);
1405                                 if (c->algorithm_enc & SSL_eNULL)
1406                                         nc=c;
1407                                 if (SSL_C_IS_EXPORT(c))
1408                                         ec=c;
1409                                 }
1410                         if (nc != NULL)
1411                                 s->s3->tmp.new_cipher=nc;
1412                         else if (ec != NULL)
1413                                 s->s3->tmp.new_cipher=ec;
1414                         else
1415                                 s->s3->tmp.new_cipher=s->session->cipher;
1416                         }
1417                 else
1418 #endif
1419                 s->s3->tmp.new_cipher=s->session->cipher;
1420                 }
1421
1422         if (!SSL_USE_SIGALGS(s) || !(s->verify_mode & SSL_VERIFY_PEER))
1423                 {
1424                 if (!ssl3_digest_cached_records(s))
1425                         goto f_err;
1426                 }
1427
1428         /*-
1429          * we now have the following setup.
1430          * client_random
1431          * cipher_list          - our prefered list of ciphers
1432          * ciphers              - the clients prefered list of ciphers
1433          * compression          - basically ignored right now
1434          * ssl version is set   - sslv3
1435          * s->session           - The ssl session has been setup.
1436          * s->hit               - session reuse flag
1437          * s->tmp.new_cipher    - the new cipher to use.
1438          */
1439
1440         /* Handles TLS extensions that we couldn't check earlier */
1441         if (s->version >= SSL3_VERSION)
1442                 {
1443                 if (ssl_check_clienthello_tlsext_late(s) <= 0)
1444                         {
1445                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT);
1446                         goto err;
1447                         }
1448                 }
1449
1450         if (ret < 0) ret=-ret;
1451         if (0)
1452                 {
1453 f_err:
1454                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1455                 }
1456 err:
1457         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
1458         return ret < 0 ? -1 : ret;
1459         }
1460
1461 int ssl3_send_server_hello(SSL *s)
1462         {
1463         unsigned char *buf;
1464         unsigned char *p,*d;
1465         int i,sl;
1466         int al = 0;
1467         unsigned long l;
1468
1469         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
1470                 {
1471                 buf=(unsigned char *)s->init_buf->data;
1472 #ifdef OPENSSL_NO_TLSEXT
1473                 p=s->s3->server_random;
1474                 if (ssl_fill_hello_random(s, 1, p, SSL3_RANDOM_SIZE) <= 0)
1475                         return -1;
1476 #endif
1477                 /* Do the message type and length last */
1478                 d=p= ssl_handshake_start(s);
1479
1480                 *(p++)=s->version>>8;
1481                 *(p++)=s->version&0xff;
1482
1483                 /* Random stuff */
1484                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
1485                 p+=SSL3_RANDOM_SIZE;
1486
1487                 /*-
1488                  * There are several cases for the session ID to send
1489                  * back in the server hello:
1490                  * - For session reuse from the session cache,
1491                  *   we send back the old session ID.
1492                  * - If stateless session reuse (using a session ticket)
1493                  *   is successful, we send back the client's "session ID"
1494                  *   (which doesn't actually identify the session).
1495                  * - If it is a new session, we send back the new
1496                  *   session ID.
1497                  * - However, if we want the new session to be single-use,
1498                  *   we send back a 0-length session ID.
1499                  * s->hit is non-zero in either case of session reuse,
1500                  * so the following won't overwrite an ID that we're supposed
1501                  * to send back.
1502                  */
1503                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)
1504                         && !s->hit)
1505                         s->session->session_id_length=0;
1506
1507                 sl=s->session->session_id_length;
1508                 if (sl > (int)sizeof(s->session->session_id))
1509                         {
1510                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1511                         return -1;
1512                         }
1513                 *(p++)=sl;
1514                 memcpy(p,s->session->session_id,sl);
1515                 p+=sl;
1516
1517                 /* put the cipher */
1518                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
1519                 p+=i;
1520
1521                 /* put the compression method */
1522 #ifdef OPENSSL_NO_COMP
1523                         *(p++)=0;
1524 #else
1525                 if (s->s3->tmp.new_compression == NULL)
1526                         *(p++)=0;
1527                 else
1528                         *(p++)=s->s3->tmp.new_compression->id;
1529 #endif
1530 #ifndef OPENSSL_NO_TLSEXT
1531                 if (ssl_prepare_serverhello_tlsext(s) <= 0)
1532                         {
1533                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
1534                         return -1;
1535                         }
1536                 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH, &al)) == NULL)
1537                         {
1538                         ssl3_send_alert(s, SSL3_AL_FATAL, al);
1539                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
1540                         return -1;
1541                         }
1542 #endif
1543                 /* do the header */
1544                 l=(p-d);
1545                 ssl_set_handshake_header(s, SSL3_MT_SERVER_HELLO, l);
1546                 s->state=SSL3_ST_SW_SRVR_HELLO_B;
1547                 }
1548
1549         /* SSL3_ST_SW_SRVR_HELLO_B */
1550         return ssl_do_write(s);
1551         }
1552
1553 int ssl3_send_server_done(SSL *s)
1554         {
1555
1556         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1557                 {
1558                 ssl_set_handshake_header(s, SSL3_MT_SERVER_DONE, 0);
1559                 s->state = SSL3_ST_SW_SRVR_DONE_B;
1560                 }
1561
1562         /* SSL3_ST_SW_SRVR_DONE_B */
1563         return ssl_do_write(s);
1564         }
1565
1566 int ssl3_send_server_key_exchange(SSL *s)
1567         {
1568 #ifndef OPENSSL_NO_RSA
1569         unsigned char *q;
1570         int j,num;
1571         RSA *rsa;
1572         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1573         unsigned int u;
1574 #endif
1575 #ifndef OPENSSL_NO_DH
1576         DH *dh=NULL,*dhp;
1577 #endif
1578 #ifndef OPENSSL_NO_ECDH
1579         EC_KEY *ecdh=NULL, *ecdhp;
1580         unsigned char *encodedPoint = NULL;
1581         int encodedlen = 0;
1582         int curve_id = 0;
1583         BN_CTX *bn_ctx = NULL;
1584 #endif
1585         EVP_PKEY *pkey;
1586         const EVP_MD *md = NULL;
1587         unsigned char *p,*d;
1588         int al,i;
1589         unsigned long type;
1590         int n;
1591         CERT *cert;
1592         BIGNUM *r[4];
1593         int nr[4],kn;
1594         BUF_MEM *buf;
1595         EVP_MD_CTX md_ctx;
1596
1597         EVP_MD_CTX_init(&md_ctx);
1598         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1599                 {
1600                 type=s->s3->tmp.new_cipher->algorithm_mkey;
1601                 cert=s->cert;
1602
1603                 buf=s->init_buf;
1604
1605                 r[0]=r[1]=r[2]=r[3]=NULL;
1606                 n=0;
1607 #ifndef OPENSSL_NO_RSA
1608                 if (type & SSL_kRSA)
1609                         {
1610                         rsa=cert->rsa_tmp;
1611                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1612                                 {
1613                                 rsa=s->cert->rsa_tmp_cb(s,
1614                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1615                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1616                                 if(rsa == NULL)
1617                                 {
1618                                         al=SSL_AD_HANDSHAKE_FAILURE;
1619                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1620                                         goto f_err;
1621                                 }
1622                                 RSA_up_ref(rsa);
1623                                 cert->rsa_tmp=rsa;
1624                                 }
1625                         if (rsa == NULL)
1626                                 {
1627                                 al=SSL_AD_HANDSHAKE_FAILURE;
1628                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1629                                 goto f_err;
1630                                 }
1631                         r[0]=rsa->n;
1632                         r[1]=rsa->e;
1633                         s->s3->tmp.use_rsa_tmp=1;
1634                         }
1635                 else
1636 #endif
1637 #ifndef OPENSSL_NO_DH
1638                         if (type & SSL_kEDH)
1639                         {
1640                         dhp=cert->dh_tmp;
1641                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1642                                 dhp=s->cert->dh_tmp_cb(s,
1643                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1644                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1645                         if (dhp == NULL)
1646                                 {
1647                                 al=SSL_AD_HANDSHAKE_FAILURE;
1648                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1649                                 goto f_err;
1650                                 }
1651
1652                         if (s->s3->tmp.dh != NULL)
1653                                 {
1654                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1655                                 goto err;
1656                                 }
1657
1658                         if ((dh=DHparams_dup(dhp)) == NULL)
1659                                 {
1660                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1661                                 goto err;
1662                                 }
1663
1664                         s->s3->tmp.dh=dh;
1665                         if ((dhp->pub_key == NULL ||
1666                              dhp->priv_key == NULL ||
1667                              (s->options & SSL_OP_SINGLE_DH_USE)))
1668                                 {
1669                                 if(!DH_generate_key(dh))
1670                                     {
1671                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1672                                            ERR_R_DH_LIB);
1673                                     goto err;
1674                                     }
1675                                 }
1676                         else
1677                                 {
1678                                 dh->pub_key=BN_dup(dhp->pub_key);
1679                                 dh->priv_key=BN_dup(dhp->priv_key);
1680                                 if ((dh->pub_key == NULL) ||
1681                                         (dh->priv_key == NULL))
1682                                         {
1683                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1684                                         goto err;
1685                                         }
1686                                 }
1687                         r[0]=dh->p;
1688                         r[1]=dh->g;
1689                         r[2]=dh->pub_key;
1690                         }
1691                 else
1692 #endif
1693 #ifndef OPENSSL_NO_ECDH
1694                         if (type & SSL_kEECDH)
1695                         {
1696                         const EC_GROUP *group;
1697
1698                         ecdhp=cert->ecdh_tmp;
1699                         if (s->cert->ecdh_tmp_auto)
1700                                 {
1701                                 /* Get NID of appropriate shared curve */
1702                                 int nid = tls1_shared_curve(s, -2);
1703                                 if (nid != NID_undef)
1704                                         ecdhp = EC_KEY_new_by_curve_name(nid);
1705                                 }
1706                         else if ((ecdhp == NULL) && s->cert->ecdh_tmp_cb)
1707                                 {
1708                                 ecdhp=s->cert->ecdh_tmp_cb(s,
1709                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1710                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1711                                 }
1712                         if (ecdhp == NULL)
1713                                 {
1714                                 al=SSL_AD_HANDSHAKE_FAILURE;
1715                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1716                                 goto f_err;
1717                                 }
1718
1719                         if (s->s3->tmp.ecdh != NULL)
1720                                 {
1721                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1722                                 goto err;
1723                                 }
1724
1725                         /* Duplicate the ECDH structure. */
1726                         if (ecdhp == NULL)
1727                                 {
1728                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1729                                 goto err;
1730                                 }
1731                         if (s->cert->ecdh_tmp_auto)
1732                                 ecdh = ecdhp;
1733                         else if ((ecdh = EC_KEY_dup(ecdhp)) == NULL)
1734                                 {
1735                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1736                                 goto err;
1737                                 }
1738
1739                         s->s3->tmp.ecdh=ecdh;
1740                         if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1741                             (EC_KEY_get0_private_key(ecdh) == NULL) ||
1742                             (s->options & SSL_OP_SINGLE_ECDH_USE))
1743                                 {
1744                                 if(!EC_KEY_generate_key(ecdh))
1745                                     {
1746                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1747                                     goto err;
1748                                     }
1749                                 }
1750
1751                         if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1752                             (EC_KEY_get0_public_key(ecdh)  == NULL) ||
1753                             (EC_KEY_get0_private_key(ecdh) == NULL))
1754                                 {
1755                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1756                                 goto err;
1757                                 }
1758
1759                         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1760                             (EC_GROUP_get_degree(group) > 163))
1761                                 {
1762                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1763                                 goto err;
1764                                 }
1765
1766                         /* XXX: For now, we only support ephemeral ECDH
1767                          * keys over named (not generic) curves. For
1768                          * supported named curves, curve_id is non-zero.
1769                          */
1770                         if ((curve_id =
1771                             tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1772                             == 0)
1773                                 {
1774                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1775                                 goto err;
1776                                 }
1777
1778                         /* Encode the public key.
1779                          * First check the size of encoding and
1780                          * allocate memory accordingly.
1781                          */
1782                         encodedlen = EC_POINT_point2oct(group,
1783                             EC_KEY_get0_public_key(ecdh),
1784                             POINT_CONVERSION_UNCOMPRESSED,
1785                             NULL, 0, NULL);
1786
1787                         encodedPoint = (unsigned char *)
1788                             OPENSSL_malloc(encodedlen*sizeof(unsigned char));
1789                         bn_ctx = BN_CTX_new();
1790                         if ((encodedPoint == NULL) || (bn_ctx == NULL))
1791                                 {
1792                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1793                                 goto err;
1794                                 }
1795
1796
1797                         encodedlen = EC_POINT_point2oct(group,
1798                             EC_KEY_get0_public_key(ecdh),
1799                             POINT_CONVERSION_UNCOMPRESSED,
1800                             encodedPoint, encodedlen, bn_ctx);
1801
1802                         if (encodedlen == 0)
1803                                 {
1804                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1805                                 goto err;
1806                                 }
1807
1808                         BN_CTX_free(bn_ctx);  bn_ctx=NULL;
1809
1810                         /* XXX: For now, we only support named (not
1811                          * generic) curves in ECDH ephemeral key exchanges.
1812                          * In this situation, we need four additional bytes
1813                          * to encode the entire ServerECDHParams
1814                          * structure.
1815                          */
1816                         n = 4 + encodedlen;
1817
1818                         /* We'll generate the serverKeyExchange message
1819                          * explicitly so we can set these to NULLs
1820                          */
1821                         r[0]=NULL;
1822                         r[1]=NULL;
1823                         r[2]=NULL;
1824                         r[3]=NULL;
1825                         }
1826                 else
1827 #endif /* !OPENSSL_NO_ECDH */
1828 #ifndef OPENSSL_NO_PSK
1829                         if (type & SSL_kPSK)
1830                                 {
1831                                 /* reserve size for record length and PSK identity hint*/
1832                                 n+=2+strlen(s->ctx->psk_identity_hint);
1833                                 }
1834                         else
1835 #endif /* !OPENSSL_NO_PSK */
1836 #ifndef OPENSSL_NO_SRP
1837                 if (type & SSL_kSRP)
1838                         {
1839                         if ((s->srp_ctx.N == NULL) ||
1840                                 (s->srp_ctx.g == NULL) ||
1841                                 (s->srp_ctx.s == NULL) ||
1842                                 (s->srp_ctx.B == NULL))
1843                                 {
1844                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_SRP_PARAM);
1845                                 goto err;
1846                                 }
1847                         r[0]=s->srp_ctx.N;
1848                         r[1]=s->srp_ctx.g;
1849                         r[2]=s->srp_ctx.s;
1850                         r[3]=s->srp_ctx.B;
1851                         }
1852                 else
1853 #endif
1854                         {
1855                         al=SSL_AD_HANDSHAKE_FAILURE;
1856                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1857                         goto f_err;
1858                         }
1859                 for (i=0; i < 4 && r[i] != NULL; i++)
1860                         {
1861                         nr[i]=BN_num_bytes(r[i]);
1862 #ifndef OPENSSL_NO_SRP
1863                         if ((i == 2) && (type & SSL_kSRP))
1864                                 n+=1+nr[i];
1865                         else
1866 #endif
1867                         n+=2+nr[i];
1868                         }
1869
1870                 if (!(s->s3->tmp.new_cipher->algorithm_auth & (SSL_aNULL|SSL_aSRP))
1871                         && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
1872                         {
1873                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher,&md))
1874                                 == NULL)
1875                                 {
1876                                 al=SSL_AD_DECODE_ERROR;
1877                                 goto f_err;
1878                                 }
1879                         kn=EVP_PKEY_size(pkey);
1880                         }
1881                 else
1882                         {
1883                         pkey=NULL;
1884                         kn=0;
1885                         }
1886
1887                 if (!BUF_MEM_grow_clean(buf,n+SSL_HM_HEADER_LENGTH(s)+kn))
1888                         {
1889                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1890                         goto err;
1891                         }
1892                 d = p = ssl_handshake_start(s);
1893
1894                 for (i=0; i < 4 && r[i] != NULL; i++)
1895                         {
1896 #ifndef OPENSSL_NO_SRP
1897                         if ((i == 2) && (type & SSL_kSRP))
1898                                 {
1899                                 *p = nr[i];
1900                                 p++;
1901                                 }
1902                         else
1903 #endif
1904                         s2n(nr[i],p);
1905                         BN_bn2bin(r[i],p);
1906                         p+=nr[i];
1907                         }
1908
1909 #ifndef OPENSSL_NO_ECDH
1910                 if (type & SSL_kEECDH)
1911                         {
1912                         /* XXX: For now, we only support named (not generic) curves.
1913                          * In this situation, the serverKeyExchange message has:
1914                          * [1 byte CurveType], [2 byte CurveName]
1915                          * [1 byte length of encoded point], followed by
1916                          * the actual encoded point itself
1917                          */
1918                         *p = NAMED_CURVE_TYPE;
1919                         p += 1;
1920                         *p = 0;
1921                         p += 1;
1922                         *p = curve_id;
1923                         p += 1;
1924                         *p = encodedlen;
1925                         p += 1;
1926                         memcpy((unsigned char*)p,
1927                             (unsigned char *)encodedPoint,
1928                             encodedlen);
1929                         OPENSSL_free(encodedPoint);
1930                         encodedPoint = NULL;
1931                         p += encodedlen;
1932                         }
1933 #endif
1934
1935 #ifndef OPENSSL_NO_PSK
1936                 if (type & SSL_kPSK)
1937                         {
1938                         /* copy PSK identity hint */
1939                         s2n(strlen(s->ctx->psk_identity_hint), p);
1940                         strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
1941                         p+=strlen(s->ctx->psk_identity_hint);
1942                         }
1943 #endif
1944
1945                 /* not anonymous */
1946                 if (pkey != NULL)
1947                         {
1948                         /* n is the length of the params, they start at &(d[4])
1949                          * and p points to the space at the end. */
1950 #ifndef OPENSSL_NO_RSA
1951                         if (pkey->type == EVP_PKEY_RSA && !SSL_USE_SIGALGS(s))
1952                                 {
1953                                 q=md_buf;
1954                                 j=0;
1955                                 for (num=2; num > 0; num--)
1956                                         {
1957                                         EVP_MD_CTX_set_flags(&md_ctx,
1958                                                 EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1959                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1960                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1961                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1962                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1963                                         EVP_DigestUpdate(&md_ctx,d,n);
1964                                         EVP_DigestFinal_ex(&md_ctx,q,
1965                                                 (unsigned int *)&i);
1966                                         q+=i;
1967                                         j+=i;
1968                                         }
1969                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1970                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1971                                         {
1972                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1973                                         goto err;
1974                                         }
1975                                 s2n(u,p);
1976                                 n+=u+2;
1977                                 }
1978                         else
1979 #endif
1980                         if (md)
1981                                 {
1982                                 /* send signature algorithm */
1983                                 if (SSL_USE_SIGALGS(s))
1984                                         {
1985                                         if (!tls12_get_sigandhash(p, pkey, md))
1986                                                 {
1987                                                 /* Should never happen */
1988                                                 al=SSL_AD_INTERNAL_ERROR;
1989                                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1990                                                 goto f_err;
1991                                                 }
1992                                         p+=2;
1993                                         }
1994 #ifdef SSL_DEBUG
1995                                 fprintf(stderr, "Using hash %s\n",
1996                                                         EVP_MD_name(md));
1997 #endif
1998                                 EVP_SignInit_ex(&md_ctx, md, NULL);
1999                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
2000                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
2001                                 EVP_SignUpdate(&md_ctx,d,n);
2002                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
2003                                         (unsigned int *)&i,pkey))
2004                                         {
2005                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_EVP);
2006                                         goto err;
2007                                         }
2008                                 s2n(i,p);
2009                                 n+=i+2;
2010                                 if (SSL_USE_SIGALGS(s))
2011                                         n+= 2;
2012                                 }
2013                         else
2014                                 {
2015                                 /* Is this error check actually needed? */
2016                                 al=SSL_AD_HANDSHAKE_FAILURE;
2017                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
2018                                 goto f_err;
2019                                 }
2020                         }
2021
2022                 ssl_set_handshake_header(s, SSL3_MT_SERVER_KEY_EXCHANGE, n);
2023                 }
2024
2025         s->state = SSL3_ST_SW_KEY_EXCH_B;
2026         EVP_MD_CTX_cleanup(&md_ctx);
2027         return ssl_do_write(s);
2028 f_err:
2029         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2030 err:
2031 #ifndef OPENSSL_NO_ECDH
2032         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2033         BN_CTX_free(bn_ctx);
2034 #endif
2035         EVP_MD_CTX_cleanup(&md_ctx);
2036         return(-1);
2037         }
2038
2039 int ssl3_send_certificate_request(SSL *s)
2040         {
2041         unsigned char *p,*d;
2042         int i,j,nl,off,n;
2043         STACK_OF(X509_NAME) *sk=NULL;
2044         X509_NAME *name;
2045         BUF_MEM *buf;
2046
2047         if (s->state == SSL3_ST_SW_CERT_REQ_A)
2048                 {
2049                 buf=s->init_buf;
2050
2051                 d=p=ssl_handshake_start(s);
2052
2053                 /* get the list of acceptable cert types */
2054                 p++;
2055                 n=ssl3_get_req_cert_type(s,p);
2056                 d[0]=n;
2057                 p+=n;
2058                 n++;
2059
2060                 if (SSL_USE_SIGALGS(s))
2061                         {
2062                         const unsigned char *psigs;
2063                         nl = tls12_get_psigalgs(s, &psigs);
2064                         s2n(nl, p);
2065                         memcpy(p, psigs, nl);
2066                         p += nl;
2067                         n += nl + 2;
2068                         }
2069
2070                 off=n;
2071                 p+=2;
2072                 n+=2;
2073
2074                 sk=SSL_get_client_CA_list(s);
2075                 nl=0;
2076                 if (sk != NULL)
2077                         {
2078                         for (i=0; i<sk_X509_NAME_num(sk); i++)
2079                                 {
2080                                 name=sk_X509_NAME_value(sk,i);
2081                                 j=i2d_X509_NAME(name,NULL);
2082                                 if (!BUF_MEM_grow_clean(buf,SSL_HM_HEADER_LENGTH(s)+n+j+2))
2083                                         {
2084                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
2085                                         goto err;
2086                                         }
2087                                 p = ssl_handshake_start(s) + n;
2088                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
2089                                         {
2090                                         s2n(j,p);
2091                                         i2d_X509_NAME(name,&p);
2092                                         n+=2+j;
2093                                         nl+=2+j;
2094                                         }
2095                                 else
2096                                         {
2097                                         d=p;
2098                                         i2d_X509_NAME(name,&p);
2099                                         j-=2; s2n(j,d); j+=2;
2100                                         n+=j;
2101                                         nl+=j;
2102                                         }
2103                                 }
2104                         }
2105                 /* else no CA names */
2106                 p = ssl_handshake_start(s) + off;
2107                 s2n(nl,p);
2108
2109                 ssl_set_handshake_header(s, SSL3_MT_CERTIFICATE_REQUEST, n);
2110
2111 #ifdef NETSCAPE_HANG_BUG
2112                 if (!SSL_IS_DTLS(s))
2113                         {
2114                         if (!BUF_MEM_grow_clean(buf, s->init_num + 4))
2115                                 {
2116                                 SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
2117                                 goto err;
2118                                 }
2119                         p=(unsigned char *)s->init_buf->data + s->init_num;
2120                         /* do the header */
2121                         *(p++)=SSL3_MT_SERVER_DONE;
2122                         *(p++)=0;
2123                         *(p++)=0;
2124                         *(p++)=0;
2125                         s->init_num += 4;
2126                         }
2127 #endif
2128
2129                 s->state = SSL3_ST_SW_CERT_REQ_B;
2130                 }
2131
2132         /* SSL3_ST_SW_CERT_REQ_B */
2133         return ssl_do_write(s);
2134 err:
2135         return(-1);
2136         }
2137
2138 int ssl3_get_client_key_exchange(SSL *s)
2139         {
2140         int i,al,ok;
2141         long n;
2142         unsigned long alg_k;
2143         unsigned char *p;
2144 #ifndef OPENSSL_NO_RSA
2145         RSA *rsa=NULL;
2146         EVP_PKEY *pkey=NULL;
2147 #endif
2148 #ifndef OPENSSL_NO_DH
2149         BIGNUM *pub=NULL;
2150         DH *dh_srvr, *dh_clnt = NULL;
2151 #endif
2152 #ifndef OPENSSL_NO_KRB5
2153         KSSL_ERR kssl_err;
2154 #endif /* OPENSSL_NO_KRB5 */
2155
2156 #ifndef OPENSSL_NO_ECDH
2157         EC_KEY *srvr_ecdh = NULL;
2158         EVP_PKEY *clnt_pub_pkey = NULL;
2159         EC_POINT *clnt_ecpoint = NULL;
2160         BN_CTX *bn_ctx = NULL;
2161 #endif
2162
2163         n=s->method->ssl_get_message(s,
2164                 SSL3_ST_SR_KEY_EXCH_A,
2165                 SSL3_ST_SR_KEY_EXCH_B,
2166                 SSL3_MT_CLIENT_KEY_EXCHANGE,
2167                 2048,
2168                 &ok);
2169
2170         if (!ok) return((int)n);
2171         p=(unsigned char *)s->init_msg;
2172
2173         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2174
2175 #ifndef OPENSSL_NO_RSA
2176         if (alg_k & SSL_kRSA)
2177                 {
2178                 unsigned char rand_premaster_secret[SSL_MAX_MASTER_KEY_LENGTH];
2179                 int decrypt_len;
2180                 unsigned char decrypt_good, version_good;
2181                 size_t j;
2182
2183                 /* FIX THIS UP EAY EAY EAY EAY */
2184                 if (s->s3->tmp.use_rsa_tmp)
2185                         {
2186                         if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
2187                                 rsa=s->cert->rsa_tmp;
2188                         /* Don't do a callback because rsa_tmp should
2189                          * be sent already */
2190                         if (rsa == NULL)
2191                                 {
2192                                 al=SSL_AD_HANDSHAKE_FAILURE;
2193                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
2194                                 goto f_err;
2195
2196                                 }
2197                         }
2198                 else
2199                         {
2200                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
2201                         if (    (pkey == NULL) ||
2202                                 (pkey->type != EVP_PKEY_RSA) ||
2203                                 (pkey->pkey.rsa == NULL))
2204                                 {
2205                                 al=SSL_AD_HANDSHAKE_FAILURE;
2206                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
2207                                 goto f_err;
2208                                 }
2209                         rsa=pkey->pkey.rsa;
2210                         }
2211
2212                 /* TLS and [incidentally] DTLS{0xFEFF} */
2213                 if (s->version > SSL3_VERSION && s->version != DTLS1_BAD_VER)
2214                         {
2215                         n2s(p,i);
2216                         if (n != i+2)
2217                                 {
2218                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
2219                                         {
2220                                         al = SSL_AD_DECODE_ERROR;
2221                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
2222                                         goto f_err;
2223                                         }
2224                                 else
2225                                         p-=2;
2226                                 }
2227                         else
2228                                 n=i;
2229                         }
2230
2231                 /*
2232                  * Reject overly short RSA ciphertext because we want to be sure
2233                  * that the buffer size makes it safe to iterate over the entire
2234                  * size of a premaster secret (SSL_MAX_MASTER_KEY_LENGTH). The
2235                  * actual expected size is larger due to RSA padding, but the
2236                  * bound is sufficient to be safe.
2237                  */
2238                 if (n < SSL_MAX_MASTER_KEY_LENGTH)
2239                         {
2240                         al = SSL_AD_DECRYPT_ERROR;
2241                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
2242                         goto f_err;
2243                         }
2244
2245                 /* We must not leak whether a decryption failure occurs because
2246                  * of Bleichenbacher's attack on PKCS #1 v1.5 RSA padding (see
2247                  * RFC 2246, section 7.4.7.1). The code follows that advice of
2248                  * the TLS RFC and generates a random premaster secret for the
2249                  * case that the decrypt fails. See
2250                  * https://tools.ietf.org/html/rfc5246#section-7.4.7.1 */
2251
2252                 /* should be RAND_bytes, but we cannot work around a failure. */
2253                 if (RAND_pseudo_bytes(rand_premaster_secret,
2254                                       sizeof(rand_premaster_secret)) <= 0)
2255                         goto err;
2256                 decrypt_len = RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
2257                 ERR_clear_error();
2258
2259                 /* decrypt_len should be SSL_MAX_MASTER_KEY_LENGTH.
2260                  * decrypt_good will be 0xff if so and zero otherwise. */
2261                 decrypt_good = constant_time_eq_int_8(decrypt_len, SSL_MAX_MASTER_KEY_LENGTH);
2262
2263                 /* If the version in the decrypted pre-master secret is correct
2264                  * then version_good will be 0xff, otherwise it'll be zero.
2265                  * The Klima-Pokorny-Rosa extension of Bleichenbacher's attack
2266                  * (http://eprint.iacr.org/2003/052/) exploits the version
2267                  * number check as a "bad version oracle". Thus version checks
2268                  * are done in constant time and are treated like any other
2269                  * decryption error. */
2270                 version_good = constant_time_eq_8(p[0], (unsigned)(s->client_version>>8));
2271                 version_good &= constant_time_eq_8(p[1], (unsigned)(s->client_version&0xff));
2272
2273                 /* The premaster secret must contain the same version number as
2274                  * the ClientHello to detect version rollback attacks
2275                  * (strangely, the protocol does not offer such protection for
2276                  * DH ciphersuites). However, buggy clients exist that send the
2277                  * negotiated protocol version instead if the server does not
2278                  * support the requested protocol version. If
2279                  * SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
2280                 if (s->options & SSL_OP_TLS_ROLLBACK_BUG)
2281                         {
2282                         unsigned char workaround_good;
2283                         workaround_good = constant_time_eq_8(p[0], (unsigned)(s->version>>8));
2284                         workaround_good &= constant_time_eq_8(p[1], (unsigned)(s->version&0xff));
2285                         version_good |= workaround_good;
2286                         }
2287
2288                 /* Both decryption and version must be good for decrypt_good
2289                  * to remain non-zero (0xff). */
2290                 decrypt_good &= version_good;
2291
2292                 /*
2293                  * Now copy rand_premaster_secret over from p using
2294                  * decrypt_good_mask. If decryption failed, then p does not
2295                  * contain valid plaintext, however, a check above guarantees
2296                  * it is still sufficiently large to read from.
2297                  */
2298                 for (j = 0; j < sizeof(rand_premaster_secret); j++)
2299                         {
2300                         p[j] = constant_time_select_8(decrypt_good, p[j],
2301                                                       rand_premaster_secret[j]);
2302                         }
2303
2304                 s->session->master_key_length=
2305                         s->method->ssl3_enc->generate_master_secret(s,
2306                                 s->session->master_key,
2307                                 p,sizeof(rand_premaster_secret));
2308                 OPENSSL_cleanse(p,sizeof(rand_premaster_secret));
2309                 }
2310         else
2311 #endif
2312 #ifndef OPENSSL_NO_DH
2313                 if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2314                 {
2315                 int idx = -1;
2316                 EVP_PKEY *skey = NULL;
2317                 if (n)
2318                         n2s(p,i);
2319                 else
2320                         i = 0;
2321                 if (n && n != i+2)
2322                         {
2323                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
2324                                 {
2325                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
2326                                 goto err;
2327                                 }
2328                         else
2329                                 {
2330                                 p-=2;
2331                                 i=(int)n;
2332                                 }
2333                         }
2334                 if (alg_k & SSL_kDHr)
2335                         idx = SSL_PKEY_DH_RSA;
2336                 else if (alg_k & SSL_kDHd)
2337                         idx = SSL_PKEY_DH_DSA;
2338                 if (idx >= 0)
2339                         {
2340                         skey = s->cert->pkeys[idx].privatekey;
2341                         if ((skey == NULL) ||
2342                                 (skey->type != EVP_PKEY_DH) ||
2343                                 (skey->pkey.dh == NULL))
2344                                 {
2345                                 al=SSL_AD_HANDSHAKE_FAILURE;
2346                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
2347                                 goto f_err;
2348                                 }
2349                         dh_srvr = skey->pkey.dh;
2350                         }
2351                 else if (s->s3->tmp.dh == NULL)
2352                         {
2353                         al=SSL_AD_HANDSHAKE_FAILURE;
2354                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
2355                         goto f_err;
2356                         }
2357                 else
2358                         dh_srvr=s->s3->tmp.dh;
2359
2360                 if (n == 0L)
2361                         {
2362                         /* Get pubkey from cert */
2363                         EVP_PKEY *clkey=X509_get_pubkey(s->session->peer);
2364                         if (clkey)
2365                                 {
2366                                 if (EVP_PKEY_cmp_parameters(clkey, skey) == 1)
2367                                         dh_clnt = EVP_PKEY_get1_DH(clkey);
2368                                 }
2369                         if (dh_clnt == NULL)
2370                                 {
2371                                 al=SSL_AD_HANDSHAKE_FAILURE;
2372                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
2373                                 goto f_err;
2374                                 }
2375                         EVP_PKEY_free(clkey);
2376                         pub = dh_clnt->pub_key;
2377                         }
2378                 else
2379                         pub=BN_bin2bn(p,i,NULL);
2380                 if (pub == NULL)
2381                         {
2382                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
2383                         goto err;
2384                         }
2385
2386                 i=DH_compute_key(p,pub,dh_srvr);
2387
2388                 if (i <= 0)
2389                         {
2390                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2391                         BN_clear_free(pub);
2392                         goto err;
2393                         }
2394
2395                 DH_free(s->s3->tmp.dh);
2396                 s->s3->tmp.dh=NULL;
2397                 if (dh_clnt)
2398                         DH_free(dh_clnt);
2399                 else
2400                         BN_clear_free(pub);
2401                 pub=NULL;
2402                 s->session->master_key_length=
2403                         s->method->ssl3_enc->generate_master_secret(s,
2404                                 s->session->master_key,p,i);
2405                 OPENSSL_cleanse(p,i);
2406                 if (dh_clnt)
2407                         return 2;
2408                 }
2409         else
2410 #endif
2411 #ifndef OPENSSL_NO_KRB5
2412         if (alg_k & SSL_kKRB5)
2413                 {
2414                 krb5_error_code         krb5rc;
2415                 krb5_data               enc_ticket;
2416                 krb5_data               authenticator;
2417                 krb5_data               enc_pms;
2418                 KSSL_CTX                *kssl_ctx = s->kssl_ctx;
2419                 EVP_CIPHER_CTX          ciph_ctx;
2420                 const EVP_CIPHER        *enc = NULL;
2421                 unsigned char           iv[EVP_MAX_IV_LENGTH];
2422                 unsigned char           pms[SSL_MAX_MASTER_KEY_LENGTH
2423                                                + EVP_MAX_BLOCK_LENGTH];
2424                 int                  padl, outl;
2425                 krb5_timestamp          authtime = 0;
2426                 krb5_ticket_times       ttimes;
2427
2428                 EVP_CIPHER_CTX_init(&ciph_ctx);
2429
2430                 if (!kssl_ctx)  kssl_ctx = kssl_ctx_new();
2431
2432                 n2s(p,i);
2433                 enc_ticket.length = i;
2434
2435                 if (n < (long)(enc_ticket.length + 6))
2436                         {
2437                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2438                                 SSL_R_DATA_LENGTH_TOO_LONG);
2439                         goto err;
2440                         }
2441
2442                 enc_ticket.data = (char *)p;
2443                 p+=enc_ticket.length;
2444
2445                 n2s(p,i);
2446                 authenticator.length = i;
2447
2448                 if (n < (long)(enc_ticket.length + authenticator.length + 6))
2449                         {
2450                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2451                                 SSL_R_DATA_LENGTH_TOO_LONG);
2452                         goto err;
2453                         }
2454
2455                 authenticator.data = (char *)p;
2456                 p+=authenticator.length;
2457
2458                 n2s(p,i);
2459                 enc_pms.length = i;
2460                 enc_pms.data = (char *)p;
2461                 p+=enc_pms.length;
2462
2463                 /* Note that the length is checked again below,
2464                 ** after decryption
2465                 */
2466                 if(enc_pms.length > sizeof pms)
2467                         {
2468                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2469                                SSL_R_DATA_LENGTH_TOO_LONG);
2470                         goto err;
2471                         }
2472
2473                 if (n != (long)(enc_ticket.length + authenticator.length +
2474                                                 enc_pms.length + 6))
2475                         {
2476                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2477                                 SSL_R_DATA_LENGTH_TOO_LONG);
2478                         goto err;
2479                         }
2480
2481                 if ((krb5rc = kssl_sget_tkt(kssl_ctx, &enc_ticket, &ttimes,
2482                                         &kssl_err)) != 0)
2483                         {
2484 #ifdef KSSL_DEBUG
2485                         fprintf(stderr,"kssl_sget_tkt rtn %d [%d]\n",
2486                                 krb5rc, kssl_err.reason);
2487                         if (kssl_err.text)
2488                                 fprintf(stderr,"kssl_err text= %s\n", kssl_err.text);
2489 #endif  /* KSSL_DEBUG */
2490                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2491                                 kssl_err.reason);
2492                         goto err;
2493                         }
2494
2495                 /*  Note: no authenticator is not considered an error,
2496                 **  but will return authtime == 0.
2497                 */
2498                 if ((krb5rc = kssl_check_authent(kssl_ctx, &authenticator,
2499                                         &authtime, &kssl_err)) != 0)
2500                         {
2501 #ifdef KSSL_DEBUG
2502                         fprintf(stderr,"kssl_check_authent rtn %d [%d]\n",
2503                                 krb5rc, kssl_err.reason);
2504                         if (kssl_err.text)
2505                                 fprintf(stderr,"kssl_err text= %s\n", kssl_err.text);
2506 #endif  /* KSSL_DEBUG */
2507                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2508                                 kssl_err.reason);
2509                         goto err;
2510                         }
2511
2512                 if ((krb5rc = kssl_validate_times(authtime, &ttimes)) != 0)
2513                         {
2514                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, krb5rc);
2515                         goto err;
2516                         }
2517
2518 #ifdef KSSL_DEBUG
2519                 kssl_ctx_show(kssl_ctx);
2520 #endif  /* KSSL_DEBUG */
2521
2522                 enc = kssl_map_enc(kssl_ctx->enctype);
2523                 if (enc == NULL)
2524                     goto err;
2525
2526                 memset(iv, 0, sizeof iv);       /* per RFC 1510 */
2527
2528                 if (!EVP_DecryptInit_ex(&ciph_ctx,enc,NULL,kssl_ctx->key,iv))
2529                         {
2530                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2531                                 SSL_R_DECRYPTION_FAILED);
2532                         goto err;
2533                         }
2534                 if (!EVP_DecryptUpdate(&ciph_ctx, pms,&outl,
2535                                         (unsigned char *)enc_pms.data, enc_pms.length))
2536                         {
2537                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2538                                 SSL_R_DECRYPTION_FAILED);
2539                         goto err;
2540                         }
2541                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2542                         {
2543                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2544                                 SSL_R_DATA_LENGTH_TOO_LONG);
2545                         goto err;
2546                         }
2547                 if (!EVP_DecryptFinal_ex(&ciph_ctx,&(pms[outl]),&padl))
2548                         {
2549                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2550                                 SSL_R_DECRYPTION_FAILED);
2551                         goto err;
2552                         }
2553                 outl += padl;
2554                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2555                         {
2556                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2557                                 SSL_R_DATA_LENGTH_TOO_LONG);
2558                         goto err;
2559                         }
2560                 if (!((pms[0] == (s->client_version>>8)) && (pms[1] == (s->client_version & 0xff))))
2561                     {
2562                     /* The premaster secret must contain the same version number as the
2563                      * ClientHello to detect version rollback attacks (strangely, the
2564                      * protocol does not offer such protection for DH ciphersuites).
2565                      * However, buggy clients exist that send random bytes instead of
2566                      * the protocol version.
2567                      * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients.
2568                      * (Perhaps we should have a separate BUG value for the Kerberos cipher)
2569                      */
2570                     if (!(s->options & SSL_OP_TLS_ROLLBACK_BUG))
2571                         {
2572                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2573                                SSL_AD_DECODE_ERROR);
2574                         goto err;
2575                         }
2576                     }
2577
2578                 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2579
2580                 s->session->master_key_length=
2581                         s->method->ssl3_enc->generate_master_secret(s,
2582                                 s->session->master_key, pms, outl);
2583
2584                 if (kssl_ctx->client_princ)
2585                         {
2586                         size_t len = strlen(kssl_ctx->client_princ);
2587                         if ( len < SSL_MAX_KRB5_PRINCIPAL_LENGTH )
2588                                 {
2589                                 s->session->krb5_client_princ_len = len;
2590                                 memcpy(s->session->krb5_client_princ,kssl_ctx->client_princ,len);
2591                                 }
2592                         }
2593
2594
2595                 /*- Was doing kssl_ctx_free() here,
2596                  *  but it caused problems for apache.
2597                  *  kssl_ctx = kssl_ctx_free(kssl_ctx);
2598                  *  if (s->kssl_ctx)  s->kssl_ctx = NULL;
2599                  */
2600                 }
2601         else
2602 #endif  /* OPENSSL_NO_KRB5 */
2603
2604 #ifndef OPENSSL_NO_ECDH
2605                 if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2606                 {
2607                 int ret = 1;
2608                 int field_size = 0;
2609                 const EC_KEY   *tkey;
2610                 const EC_GROUP *group;
2611                 const BIGNUM *priv_key;
2612
2613                 /* initialize structures for server's ECDH key pair */
2614                 if ((srvr_ecdh = EC_KEY_new()) == NULL)
2615                         {
2616                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2617                             ERR_R_MALLOC_FAILURE);
2618                         goto err;
2619                         }
2620
2621                 /* Let's get server private key and group information */
2622                 if (alg_k & (SSL_kECDHr|SSL_kECDHe))
2623                         {
2624                         /* use the certificate */
2625                         tkey = s->cert->pkeys[SSL_PKEY_ECC].privatekey->pkey.ec;
2626                         }
2627                 else
2628                         {
2629                         /* use the ephermeral values we saved when
2630                          * generating the ServerKeyExchange msg.
2631                          */
2632                         tkey = s->s3->tmp.ecdh;
2633                         }
2634
2635                 group    = EC_KEY_get0_group(tkey);
2636                 priv_key = EC_KEY_get0_private_key(tkey);
2637
2638                 if (!EC_KEY_set_group(srvr_ecdh, group) ||
2639                     !EC_KEY_set_private_key(srvr_ecdh, priv_key))
2640                         {
2641                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2642                                ERR_R_EC_LIB);
2643                         goto err;
2644                         }
2645
2646                 /* Let's get client's public key */
2647                 if ((clnt_ecpoint = EC_POINT_new(group)) == NULL)
2648                         {
2649                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2650                             ERR_R_MALLOC_FAILURE);
2651                         goto err;
2652                         }
2653
2654                 if (n == 0L)
2655                         {
2656                         /* Client Publickey was in Client Certificate */
2657
2658                          if (alg_k & SSL_kEECDH)
2659                                  {
2660                                  al=SSL_AD_HANDSHAKE_FAILURE;
2661                                  SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
2662                                  goto f_err;
2663                                  }
2664                         if (((clnt_pub_pkey=X509_get_pubkey(s->session->peer))
2665                             == NULL) ||
2666                             (clnt_pub_pkey->type != EVP_PKEY_EC))
2667                                 {
2668                                 /* XXX: For now, we do not support client
2669                                  * authentication using ECDH certificates
2670                                  * so this branch (n == 0L) of the code is
2671                                  * never executed. When that support is
2672                                  * added, we ought to ensure the key
2673                                  * received in the certificate is
2674                                  * authorized for key agreement.
2675                                  * ECDH_compute_key implicitly checks that
2676                                  * the two ECDH shares are for the same
2677                                  * group.
2678                                  */
2679                                 al=SSL_AD_HANDSHAKE_FAILURE;
2680                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2681                                     SSL_R_UNABLE_TO_DECODE_ECDH_CERTS);
2682                                 goto f_err;
2683                                 }
2684
2685                         if (EC_POINT_copy(clnt_ecpoint,
2686                             EC_KEY_get0_public_key(clnt_pub_pkey->pkey.ec)) == 0)
2687                                 {
2688                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2689                                         ERR_R_EC_LIB);
2690                                 goto err;
2691                                 }
2692                         ret = 2; /* Skip certificate verify processing */
2693                         }
2694                 else
2695                         {
2696                         /* Get client's public key from encoded point
2697                          * in the ClientKeyExchange message.
2698                          */
2699                         if ((bn_ctx = BN_CTX_new()) == NULL)
2700                                 {
2701                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2702                                     ERR_R_MALLOC_FAILURE);
2703                                 goto err;
2704                                 }
2705
2706                         /* Get encoded point length */
2707                         i = *p;
2708                         p += 1;
2709                         if (n != 1 + i)
2710                                 {
2711                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2712                                     ERR_R_EC_LIB);
2713                                 goto err;
2714                                 }
2715                         if (EC_POINT_oct2point(group,
2716                             clnt_ecpoint, p, i, bn_ctx) == 0)
2717                                 {
2718                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2719                                     ERR_R_EC_LIB);
2720                                 goto err;
2721                                 }
2722                         /* p is pointing to somewhere in the buffer
2723                          * currently, so set it to the start
2724                          */
2725                         p=(unsigned char *)s->init_buf->data;
2726                         }
2727
2728                 /* Compute the shared pre-master secret */
2729                 field_size = EC_GROUP_get_degree(group);
2730                 if (field_size <= 0)
2731                         {
2732                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2733                                ERR_R_ECDH_LIB);
2734                         goto err;
2735                         }
2736                 i = ECDH_compute_key(p, (field_size+7)/8, clnt_ecpoint, srvr_ecdh, NULL);
2737                 if (i <= 0)
2738                         {
2739                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2740                             ERR_R_ECDH_LIB);
2741                         goto err;
2742                         }
2743
2744                 EVP_PKEY_free(clnt_pub_pkey);
2745                 EC_POINT_free(clnt_ecpoint);
2746                 EC_KEY_free(srvr_ecdh);
2747                 BN_CTX_free(bn_ctx);
2748                 EC_KEY_free(s->s3->tmp.ecdh);
2749                 s->s3->tmp.ecdh = NULL;
2750
2751                 /* Compute the master secret */
2752                 s->session->master_key_length = s->method->ssl3_enc-> \
2753                     generate_master_secret(s, s->session->master_key, p, i);
2754
2755                 OPENSSL_cleanse(p, i);
2756                 return (ret);
2757                 }
2758         else
2759 #endif
2760 #ifndef OPENSSL_NO_PSK
2761                 if (alg_k & SSL_kPSK)
2762                         {
2763                         unsigned char *t = NULL;
2764                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
2765                         unsigned int pre_ms_len = 0, psk_len = 0;
2766                         int psk_err = 1;
2767                         char tmp_id[PSK_MAX_IDENTITY_LEN+1];
2768
2769                         al=SSL_AD_HANDSHAKE_FAILURE;
2770
2771                         n2s(p,i);
2772                         if (n != i+2)
2773                                 {
2774                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2775                                         SSL_R_LENGTH_MISMATCH);
2776                                 goto psk_err;
2777                                 }
2778                         if (i > PSK_MAX_IDENTITY_LEN)
2779                                 {
2780                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2781                                         SSL_R_DATA_LENGTH_TOO_LONG);
2782                                 goto psk_err;
2783                                 }
2784                         if (s->psk_server_callback == NULL)
2785                                 {
2786                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2787                                        SSL_R_PSK_NO_SERVER_CB);
2788                                 goto psk_err;
2789                                 }
2790
2791                         /* Create guaranteed NULL-terminated identity
2792                          * string for the callback */
2793                         memcpy(tmp_id, p, i);
2794                         memset(tmp_id+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
2795                         psk_len = s->psk_server_callback(s, tmp_id,
2796                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
2797                         OPENSSL_cleanse(tmp_id, PSK_MAX_IDENTITY_LEN+1);
2798
2799                         if (psk_len > PSK_MAX_PSK_LEN)
2800                                 {
2801                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2802                                         ERR_R_INTERNAL_ERROR);
2803                                 goto psk_err;
2804                                 }
2805                         else if (psk_len == 0)
2806                                 {
2807                                 /* PSK related to the given identity not found */
2808                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2809                                        SSL_R_PSK_IDENTITY_NOT_FOUND);
2810                                 al=SSL_AD_UNKNOWN_PSK_IDENTITY;
2811                                 goto psk_err;
2812                                 }
2813
2814                         /* create PSK pre_master_secret */
2815                         pre_ms_len=2+psk_len+2+psk_len;
2816                         t = psk_or_pre_ms;
2817                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
2818                         s2n(psk_len, t);
2819                         memset(t, 0, psk_len);
2820                         t+=psk_len;
2821                         s2n(psk_len, t);
2822
2823                         if (s->session->psk_identity != NULL)
2824                                 OPENSSL_free(s->session->psk_identity);
2825                         s->session->psk_identity = BUF_strdup((char *)p);
2826                         if (s->session->psk_identity == NULL)
2827                                 {
2828                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2829                                         ERR_R_MALLOC_FAILURE);
2830                                 goto psk_err;
2831                                 }
2832
2833                         if (s->session->psk_identity_hint != NULL)
2834                                 OPENSSL_free(s->session->psk_identity_hint);
2835                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
2836                         if (s->ctx->psk_identity_hint != NULL &&
2837                                 s->session->psk_identity_hint == NULL)
2838                                 {
2839                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2840                                         ERR_R_MALLOC_FAILURE);
2841                                 goto psk_err;
2842                                 }
2843
2844                         s->session->master_key_length=
2845                                 s->method->ssl3_enc->generate_master_secret(s,
2846                                         s->session->master_key, psk_or_pre_ms, pre_ms_len);
2847                         psk_err = 0;
2848                 psk_err:
2849                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
2850                         if (psk_err != 0)
2851                                 goto f_err;
2852                         }
2853                 else
2854 #endif
2855 #ifndef OPENSSL_NO_SRP
2856                 if (alg_k & SSL_kSRP)
2857                         {
2858                         int param_len;
2859
2860                         n2s(p,i);
2861                         param_len=i+2;
2862                         if (param_len > n)
2863                                 {
2864                                 al=SSL_AD_DECODE_ERROR;
2865                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_SRP_A_LENGTH);
2866                                 goto f_err;
2867                                 }
2868                         if (!(s->srp_ctx.A=BN_bin2bn(p,i,NULL)))
2869                                 {
2870                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_BN_LIB);
2871                                 goto err;
2872                                 }
2873                         if (BN_ucmp(s->srp_ctx.A, s->srp_ctx.N) >= 0
2874                                 || BN_is_zero(s->srp_ctx.A))
2875                                 {
2876                                 al=SSL_AD_ILLEGAL_PARAMETER;
2877                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_SRP_PARAMETERS);
2878                                 goto f_err;
2879                                 }
2880                         if (s->session->srp_username != NULL)
2881                                 OPENSSL_free(s->session->srp_username);
2882                         s->session->srp_username = BUF_strdup(s->srp_ctx.login);
2883                         if (s->session->srp_username == NULL)
2884                                 {
2885                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2886                                         ERR_R_MALLOC_FAILURE);
2887                                 goto err;
2888                                 }
2889
2890                         if ((s->session->master_key_length = SRP_generate_server_master_secret(s,s->session->master_key))<0)
2891                                 {
2892                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2893                                 goto err;
2894                                 }
2895
2896                         p+=i;
2897                         }
2898                 else
2899 #endif  /* OPENSSL_NO_SRP */
2900                 if (alg_k & SSL_kGOST)
2901                         {
2902                         int ret = 0;
2903                         EVP_PKEY_CTX *pkey_ctx;
2904                         EVP_PKEY *client_pub_pkey = NULL, *pk = NULL;
2905                         unsigned char premaster_secret[32], *start;
2906                         size_t outlen=32, inlen;
2907                         unsigned long alg_a;
2908                         int Ttag, Tclass;
2909                         long Tlen;
2910
2911                         /* Get our certificate private key*/
2912                         alg_a = s->s3->tmp.new_cipher->algorithm_auth;
2913                         if (alg_a & SSL_aGOST94)
2914                                 pk = s->cert->pkeys[SSL_PKEY_GOST94].privatekey;
2915                         else if (alg_a & SSL_aGOST01)
2916                                 pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey;
2917
2918                         pkey_ctx = EVP_PKEY_CTX_new(pk,NULL);
2919                         EVP_PKEY_decrypt_init(pkey_ctx);
2920                         /* If client certificate is present and is of the same type, maybe
2921                          * use it for key exchange.  Don't mind errors from
2922                          * EVP_PKEY_derive_set_peer, because it is completely valid to use
2923                          * a client certificate for authorization only. */
2924                         client_pub_pkey = X509_get_pubkey(s->session->peer);
2925                         if (client_pub_pkey)
2926                                 {
2927                                 if (EVP_PKEY_derive_set_peer(pkey_ctx, client_pub_pkey) <= 0)
2928                                         ERR_clear_error();
2929                                 }
2930                         /* Decrypt session key */
2931                         if (ASN1_get_object((const unsigned char **)&p, &Tlen, &Ttag, &Tclass, n) != V_ASN1_CONSTRUCTED ||
2932                                 Ttag != V_ASN1_SEQUENCE ||
2933                                 Tclass != V_ASN1_UNIVERSAL)
2934                                 {
2935                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2936                                 goto gerr;
2937                                 }
2938                         start = p;
2939                         inlen = Tlen;
2940                         if (EVP_PKEY_decrypt(pkey_ctx,premaster_secret,&outlen,start,inlen) <=0)
2941
2942                                 {
2943                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2944                                 goto gerr;
2945                                 }
2946                         /* Generate master secret */
2947                         s->session->master_key_length=
2948                                 s->method->ssl3_enc->generate_master_secret(s,
2949                                         s->session->master_key,premaster_secret,32);
2950                         /* Check if pubkey from client certificate was used */
2951                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
2952                                 ret = 2;
2953                         else
2954                                 ret = 1;
2955                 gerr:
2956                         EVP_PKEY_free(client_pub_pkey);
2957                         EVP_PKEY_CTX_free(pkey_ctx);
2958                         if (ret)
2959                                 return ret;
2960                         else
2961                                 goto err;
2962                         }
2963                 else
2964                 {
2965                 al=SSL_AD_HANDSHAKE_FAILURE;
2966                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2967                                 SSL_R_UNKNOWN_CIPHER_TYPE);
2968                 goto f_err;
2969                 }
2970
2971         return(1);
2972 f_err:
2973         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2974 #if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA) || !defined(OPENSSL_NO_ECDH) || defined(OPENSSL_NO_SRP)
2975 err:
2976 #endif
2977 #ifndef OPENSSL_NO_ECDH
2978         EVP_PKEY_free(clnt_pub_pkey);
2979         EC_POINT_free(clnt_ecpoint);
2980         if (srvr_ecdh != NULL)
2981                 EC_KEY_free(srvr_ecdh);
2982         BN_CTX_free(bn_ctx);
2983 #endif
2984         return(-1);
2985         }
2986
2987 int ssl3_get_cert_verify(SSL *s)
2988         {
2989         EVP_PKEY *pkey=NULL;
2990         unsigned char *p;
2991         int al,ok,ret=0;
2992         long n;
2993         int type=0,i,j;
2994         X509 *peer;
2995         const EVP_MD *md = NULL;
2996         EVP_MD_CTX mctx;
2997         EVP_MD_CTX_init(&mctx);
2998
2999         n=s->method->ssl_get_message(s,
3000                 SSL3_ST_SR_CERT_VRFY_A,
3001                 SSL3_ST_SR_CERT_VRFY_B,
3002                 -1,
3003                 SSL3_RT_MAX_PLAIN_LENGTH,
3004                 &ok);
3005
3006         if (!ok) return((int)n);
3007
3008         if (s->session->peer != NULL)
3009                 {
3010                 peer=s->session->peer;
3011                 pkey=X509_get_pubkey(peer);
3012                 type=X509_certificate_type(peer,pkey);
3013                 }
3014         else
3015                 {
3016                 peer=NULL;
3017                 pkey=NULL;
3018                 }
3019
3020         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
3021                 {
3022                 s->s3->tmp.reuse_message=1;
3023                 if (peer != NULL)
3024                         {
3025                         al=SSL_AD_UNEXPECTED_MESSAGE;
3026                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
3027                         goto f_err;
3028                         }
3029                 ret=1;
3030                 goto end;
3031                 }
3032
3033         if (peer == NULL)
3034                 {
3035                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
3036                 al=SSL_AD_UNEXPECTED_MESSAGE;
3037                 goto f_err;
3038                 }
3039
3040         if (!(type & EVP_PKT_SIGN))
3041                 {
3042                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
3043                 al=SSL_AD_ILLEGAL_PARAMETER;
3044                 goto f_err;
3045                 }
3046
3047         if (s->s3->change_cipher_spec)
3048                 {
3049                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
3050                 al=SSL_AD_UNEXPECTED_MESSAGE;
3051                 goto f_err;
3052                 }
3053
3054         /* we now have a signature that we need to verify */
3055         p=(unsigned char *)s->init_msg;
3056         /* Check for broken implementations of GOST ciphersuites */
3057         /* If key is GOST and n is exactly 64, it is bare
3058          * signature without length field */
3059         if (n==64 && (pkey->type==NID_id_GostR3410_94 ||
3060                 pkey->type == NID_id_GostR3410_2001) )
3061                 {
3062                 i=64;
3063                 }
3064         else
3065                 {
3066                 if (SSL_USE_SIGALGS(s))
3067                         {
3068                         int rv = tls12_check_peer_sigalg(&md, s, p, pkey);
3069                         if (rv == -1)
3070                                 {
3071                                 al = SSL_AD_INTERNAL_ERROR;
3072                                 goto f_err;
3073                                 }
3074                         else if (rv == 0)
3075                                 {
3076                                 al = SSL_AD_DECODE_ERROR;
3077                                 goto f_err;
3078                                 }
3079 #ifdef SSL_DEBUG
3080 fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
3081 #endif
3082                         p += 2;
3083                         n -= 2;
3084                         }
3085                 n2s(p,i);
3086                 n-=2;
3087                 if (i > n)
3088                         {
3089                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
3090                         al=SSL_AD_DECODE_ERROR;
3091                         goto f_err;
3092                         }
3093         }
3094         j=EVP_PKEY_size(pkey);
3095         if ((i > j) || (n > j) || (n <= 0))
3096                 {
3097                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
3098                 al=SSL_AD_DECODE_ERROR;
3099                 goto f_err;
3100                 }
3101
3102         if (SSL_USE_SIGALGS(s))
3103                 {
3104                 long hdatalen = 0;
3105                 void *hdata;
3106                 hdatalen = BIO_get_mem_data(s->s3->handshake_buffer, &hdata);
3107                 if (hdatalen <= 0)
3108                         {
3109                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, ERR_R_INTERNAL_ERROR);
3110                         al=SSL_AD_INTERNAL_ERROR;
3111                         goto f_err;
3112                         }
3113 #ifdef SSL_DEBUG
3114                 fprintf(stderr, "Using TLS 1.2 with client verify alg %s\n",
3115                                                         EVP_MD_name(md));
3116 #endif
3117                 if (!EVP_VerifyInit_ex(&mctx, md, NULL)
3118                         || !EVP_VerifyUpdate(&mctx, hdata, hdatalen))
3119                         {
3120                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, ERR_R_EVP_LIB);
3121                         al=SSL_AD_INTERNAL_ERROR;
3122                         goto f_err;
3123                         }
3124
3125                 if (EVP_VerifyFinal(&mctx, p , i, pkey) <= 0)
3126                         {
3127                         al=SSL_AD_DECRYPT_ERROR;
3128                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_SIGNATURE);
3129                         goto f_err;
3130                         }
3131                 }
3132         else
3133 #ifndef OPENSSL_NO_RSA
3134         if (pkey->type == EVP_PKEY_RSA)
3135                 {
3136                 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
3137                         MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i,
3138                                                         pkey->pkey.rsa);
3139                 if (i < 0)
3140                         {
3141                         al=SSL_AD_DECRYPT_ERROR;
3142                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
3143                         goto f_err;
3144                         }
3145                 if (i == 0)
3146                         {
3147                         al=SSL_AD_DECRYPT_ERROR;
3148                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
3149                         goto f_err;
3150                         }
3151                 }
3152         else
3153 #endif
3154 #ifndef OPENSSL_NO_DSA
3155                 if (pkey->type == EVP_PKEY_DSA)
3156                 {
3157                 j=DSA_verify(pkey->save_type,
3158                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
3159                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
3160                 if (j <= 0)
3161                         {
3162                         /* bad signature */
3163                         al=SSL_AD_DECRYPT_ERROR;
3164                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
3165                         goto f_err;
3166                         }
3167                 }
3168         else
3169 #endif
3170 #ifndef OPENSSL_NO_ECDSA
3171                 if (pkey->type == EVP_PKEY_EC)
3172                 {
3173                 j=ECDSA_verify(pkey->save_type,
3174                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
3175                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.ec);
3176                 if (j <= 0)
3177                         {
3178                         /* bad signature */
3179                         al=SSL_AD_DECRYPT_ERROR;
3180                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
3181                             SSL_R_BAD_ECDSA_SIGNATURE);
3182                         goto f_err;
3183                         }
3184                 }
3185         else
3186 #endif
3187         if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001)
3188                 {   unsigned char signature[64];
3189                         int idx;
3190                         EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new(pkey,NULL);
3191                         EVP_PKEY_verify_init(pctx);
3192                         if (i!=64) {
3193                                 fprintf(stderr,"GOST signature length is %d",i);
3194                         }
3195                         for (idx=0;idx<64;idx++) {
3196                                 signature[63-idx]=p[idx];
3197                         }
3198                         j=EVP_PKEY_verify(pctx,signature,64,s->s3->tmp.cert_verify_md,32);
3199                         EVP_PKEY_CTX_free(pctx);
3200                         if (j<=0)
3201                                 {
3202                                 al=SSL_AD_DECRYPT_ERROR;
3203                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
3204                                         SSL_R_BAD_ECDSA_SIGNATURE);
3205                                 goto f_err;
3206                                 }
3207                 }
3208         else
3209                 {
3210                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
3211                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
3212                 goto f_err;
3213                 }
3214
3215
3216         ret=1;
3217         if (0)
3218                 {
3219 f_err:
3220                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
3221                 }
3222 end:
3223         if (s->s3->handshake_buffer)
3224                 {
3225                 BIO_free(s->s3->handshake_buffer);
3226                 s->s3->handshake_buffer = NULL;
3227                 s->s3->flags &= ~TLS1_FLAGS_KEEP_HANDSHAKE;
3228                 }
3229         EVP_MD_CTX_cleanup(&mctx);
3230         EVP_PKEY_free(pkey);
3231         return(ret);
3232         }
3233
3234 int ssl3_get_client_certificate(SSL *s)
3235         {
3236         int i,ok,al,ret= -1;
3237         X509 *x=NULL;
3238         unsigned long l,nc,llen,n;
3239         const unsigned char *p,*q;
3240         unsigned char *d;
3241         STACK_OF(X509) *sk=NULL;
3242
3243         n=s->method->ssl_get_message(s,
3244                 SSL3_ST_SR_CERT_A,
3245                 SSL3_ST_SR_CERT_B,
3246                 -1,
3247                 s->max_cert_list,
3248                 &ok);
3249
3250         if (!ok) return((int)n);
3251
3252         if      (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
3253                 {
3254                 if (    (s->verify_mode & SSL_VERIFY_PEER) &&
3255                         (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
3256                         {
3257                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
3258                         al=SSL_AD_HANDSHAKE_FAILURE;
3259                         goto f_err;
3260                         }
3261                 /* If tls asked for a client cert, the client must return a 0 list */
3262                 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
3263                         {
3264                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
3265                         al=SSL_AD_UNEXPECTED_MESSAGE;
3266                         goto f_err;
3267                         }
3268                 s->s3->tmp.reuse_message=1;
3269                 return(1);
3270                 }
3271
3272         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
3273                 {
3274                 al=SSL_AD_UNEXPECTED_MESSAGE;
3275                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
3276                 goto f_err;
3277                 }
3278         p=d=(unsigned char *)s->init_msg;
3279
3280         if ((sk=sk_X509_new_null()) == NULL)
3281                 {
3282                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
3283                 goto err;
3284                 }
3285
3286         n2l3(p,llen);
3287         if (llen+3 != n)
3288                 {
3289                 al=SSL_AD_DECODE_ERROR;
3290                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
3291                 goto f_err;
3292                 }
3293         for (nc=0; nc<llen; )
3294                 {
3295                 n2l3(p,l);
3296                 if ((l+nc+3) > llen)
3297                         {
3298                         al=SSL_AD_DECODE_ERROR;
3299                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
3300                         goto f_err;
3301                         }
3302
3303                 q=p;
3304                 x=d2i_X509(NULL,&p,l);
3305                 if (x == NULL)
3306                         {
3307                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
3308                         goto err;
3309                         }
3310                 if (p != (q+l))
3311                         {
3312                         al=SSL_AD_DECODE_ERROR;
3313                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
3314                         goto f_err;
3315                         }
3316                 if (!sk_X509_push(sk,x))
3317                         {
3318                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
3319                         goto err;
3320                         }
3321                 x=NULL;
3322                 nc+=l+3;
3323                 }
3324
3325         if (sk_X509_num(sk) <= 0)
3326                 {
3327                 /* TLS does not mind 0 certs returned */
3328                 if (s->version == SSL3_VERSION)
3329                         {
3330                         al=SSL_AD_HANDSHAKE_FAILURE;
3331                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
3332                         goto f_err;
3333                         }
3334                 /* Fail for TLS only if we required a certificate */
3335                 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
3336                          (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
3337                         {
3338                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
3339                         al=SSL_AD_HANDSHAKE_FAILURE;
3340                         goto f_err;
3341                         }
3342                 /* No client certificate so digest cached records */
3343                 if (s->s3->handshake_buffer && !ssl3_digest_cached_records(s))
3344                         {
3345                         al=SSL_AD_INTERNAL_ERROR;
3346                         goto f_err;
3347                         }
3348                 }
3349         else
3350                 {
3351                 i=ssl_verify_cert_chain(s,sk);
3352                 if (i <= 0)
3353                         {
3354                         al=ssl_verify_alarm_type(s->verify_result);
3355                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
3356                         goto f_err;
3357                         }
3358                 }
3359
3360         if (s->session->peer != NULL) /* This should not be needed */
3361                 X509_free(s->session->peer);
3362         s->session->peer=sk_X509_shift(sk);
3363         s->session->verify_result = s->verify_result;
3364
3365         /* With the current implementation, sess_cert will always be NULL
3366          * when we arrive here. */
3367         if (s->session->sess_cert == NULL)
3368                 {
3369                 s->session->sess_cert = ssl_sess_cert_new();
3370                 if (s->session->sess_cert == NULL)
3371                         {
3372                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
3373                         goto err;
3374                         }
3375                 }
3376         if (s->session->sess_cert->cert_chain != NULL)
3377                 sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free);
3378         s->session->sess_cert->cert_chain=sk;
3379         /* Inconsistency alert: cert_chain does *not* include the
3380          * peer's own certificate, while we do include it in s3_clnt.c */
3381
3382         sk=NULL;
3383
3384         ret=1;
3385         if (0)
3386                 {
3387 f_err:
3388                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
3389                 }
3390 err:
3391         if (x != NULL) X509_free(x);
3392         if (sk != NULL) sk_X509_pop_free(sk,X509_free);
3393         return(ret);
3394         }
3395
3396 int ssl3_send_server_certificate(SSL *s)
3397         {
3398         CERT_PKEY *cpk;
3399
3400         if (s->state == SSL3_ST_SW_CERT_A)
3401                 {
3402                 cpk=ssl_get_server_send_pkey(s);
3403                 if (cpk == NULL)
3404                         {
3405                         /* VRS: allow null cert if auth == KRB5 */
3406                         if ((s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5) ||
3407                             (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5))
3408                                 {
3409                                 SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
3410                                 return(0);
3411                                 }
3412                         }
3413
3414                 if (!ssl3_output_cert_chain(s,cpk))
3415                         {
3416                         SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
3417                         return(0);
3418                         }
3419                 s->state=SSL3_ST_SW_CERT_B;
3420                 }
3421
3422         /* SSL3_ST_SW_CERT_B */
3423         return ssl_do_write(s);
3424         }
3425
3426 #ifndef OPENSSL_NO_TLSEXT
3427 /* send a new session ticket (not necessarily for a new session) */
3428 int ssl3_send_newsession_ticket(SSL *s)
3429         {
3430         if (s->state == SSL3_ST_SW_SESSION_TICKET_A)
3431                 {
3432                 unsigned char *p, *senc, *macstart;
3433                 const unsigned char *const_p;
3434                 int len, slen_full, slen;
3435                 SSL_SESSION *sess;
3436                 unsigned int hlen;
3437                 EVP_CIPHER_CTX ctx;
3438                 HMAC_CTX hctx;
3439                 SSL_CTX *tctx = s->initial_ctx;
3440                 unsigned char iv[EVP_MAX_IV_LENGTH];
3441                 unsigned char key_name[16];
3442
3443                 /* get session encoding length */
3444                 slen_full = i2d_SSL_SESSION(s->session, NULL);
3445                 /* Some length values are 16 bits, so forget it if session is
3446                  * too long
3447                  */
3448                 if (slen_full > 0xFF00)
3449                         return -1;
3450                 senc = OPENSSL_malloc(slen_full);
3451                 if (!senc)
3452                         return -1;
3453                 p = senc;
3454                 i2d_SSL_SESSION(s->session, &p);
3455
3456                 /* create a fresh copy (not shared with other threads) to clean up */
3457                 const_p = senc;
3458                 sess = d2i_SSL_SESSION(NULL, &const_p, slen_full);
3459                 if (sess == NULL)
3460                         {
3461                         OPENSSL_free(senc);
3462                         return -1;
3463                         }
3464                 sess->session_id_length = 0; /* ID is irrelevant for the ticket */
3465
3466                 slen = i2d_SSL_SESSION(sess, NULL);
3467                 if (slen > slen_full) /* shouldn't ever happen */
3468                         {
3469                         OPENSSL_free(senc);
3470                         return -1;
3471                         }
3472                 p = senc;
3473                 i2d_SSL_SESSION(sess, &p);
3474                 SSL_SESSION_free(sess);
3475
3476                 /*-
3477                  * Grow buffer if need be: the length calculation is as
3478                  * follows handshake_header_length +
3479                  * 4 (ticket lifetime hint) + 2 (ticket length) +
3480                  * 16 (key name) + max_iv_len (iv length) +
3481                  * session_length + max_enc_block_size (max encrypted session
3482                  * length) + max_md_size (HMAC).
3483                  */
3484                 if (!BUF_MEM_grow(s->init_buf,
3485                         SSL_HM_HEADER_LENGTH(s) + 22 + EVP_MAX_IV_LENGTH +
3486                         EVP_MAX_BLOCK_LENGTH + EVP_MAX_MD_SIZE + slen))
3487                         return -1;
3488                 p = ssl_handshake_start(s);
3489                 EVP_CIPHER_CTX_init(&ctx);
3490                 HMAC_CTX_init(&hctx);
3491                 /* Initialize HMAC and cipher contexts. If callback present
3492                  * it does all the work otherwise use generated values
3493                  * from parent ctx.
3494                  */
3495                 if (tctx->tlsext_ticket_key_cb)
3496                         {
3497                         if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx,
3498                                                          &hctx, 1) < 0)
3499                                 {
3500                                 OPENSSL_free(senc);
3501                                 return -1;
3502                                 }
3503                         }
3504                 else
3505                         {
3506                         RAND_pseudo_bytes(iv, 16);
3507                         EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
3508                                         tctx->tlsext_tick_aes_key, iv);
3509                         HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
3510                                         tlsext_tick_md(), NULL);
3511                         memcpy(key_name, tctx->tlsext_tick_key_name, 16);
3512                         }
3513
3514                 /* Ticket lifetime hint (advisory only):
3515                  * We leave this unspecified for resumed session (for simplicity),
3516                  * and guess that tickets for new sessions will live as long
3517                  * as their sessions. */
3518                 l2n(s->hit ? 0 : s->session->timeout, p);
3519
3520                 /* Skip ticket length for now */
3521                 p += 2;
3522                 /* Output key name */
3523                 macstart = p;
3524                 memcpy(p, key_name, 16);
3525                 p += 16;
3526                 /* output IV */
3527                 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
3528                 p += EVP_CIPHER_CTX_iv_length(&ctx);
3529                 /* Encrypt session data */
3530                 EVP_EncryptUpdate(&ctx, p, &len, senc, slen);
3531                 p += len;
3532                 EVP_EncryptFinal(&ctx, p, &len);
3533                 p += len;
3534                 EVP_CIPHER_CTX_cleanup(&ctx);
3535
3536                 HMAC_Update(&hctx, macstart, p - macstart);
3537                 HMAC_Final(&hctx, p, &hlen);
3538                 HMAC_CTX_cleanup(&hctx);
3539
3540                 p += hlen;
3541                 /* Now write out lengths: p points to end of data written */
3542                 /* Total length */
3543                 len = p - ssl_handshake_start(s);
3544                 ssl_set_handshake_header(s, SSL3_MT_NEWSESSION_TICKET, len);
3545                 /* Skip ticket lifetime hint */
3546                 p = ssl_handshake_start(s) + 4;
3547                 s2n(len - 6, p);
3548                 s->state=SSL3_ST_SW_SESSION_TICKET_B;
3549                 OPENSSL_free(senc);
3550                 }
3551
3552         /* SSL3_ST_SW_SESSION_TICKET_B */
3553         return ssl_do_write(s);
3554         }
3555
3556 int ssl3_send_cert_status(SSL *s)
3557         {
3558         if (s->state == SSL3_ST_SW_CERT_STATUS_A)
3559                 {
3560                 unsigned char *p;
3561                 /*-
3562                  * Grow buffer if need be: the length calculation is as
3563                  * follows 1 (message type) + 3 (message length) +
3564                  * 1 (ocsp response type) + 3 (ocsp response length)
3565                  * + (ocsp response)
3566                  */
3567                 if (!BUF_MEM_grow(s->init_buf, 8 + s->tlsext_ocsp_resplen))
3568                         return -1;
3569
3570                 p=(unsigned char *)s->init_buf->data;
3571
3572                 /* do the header */
3573                 *(p++)=SSL3_MT_CERTIFICATE_STATUS;
3574                 /* message length */
3575                 l2n3(s->tlsext_ocsp_resplen + 4, p);
3576                 /* status type */
3577                 *(p++)= s->tlsext_status_type;
3578                 /* length of OCSP response */
3579                 l2n3(s->tlsext_ocsp_resplen, p);
3580                 /* actual response */
3581                 memcpy(p, s->tlsext_ocsp_resp, s->tlsext_ocsp_resplen);
3582                 /* number of bytes to write */
3583                 s->init_num = 8 + s->tlsext_ocsp_resplen;
3584                 s->state=SSL3_ST_SW_CERT_STATUS_B;
3585                 s->init_off = 0;
3586                 }
3587
3588         /* SSL3_ST_SW_CERT_STATUS_B */
3589         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3590         }
3591
3592 # ifndef OPENSSL_NO_NEXTPROTONEG
3593 /* ssl3_get_next_proto reads a Next Protocol Negotiation handshake message. It
3594  * sets the next_proto member in s if found */
3595 int ssl3_get_next_proto(SSL *s)
3596         {
3597         int ok;
3598         int proto_len, padding_len;
3599         long n;
3600         const unsigned char *p;
3601
3602         /* Clients cannot send a NextProtocol message if we didn't see the
3603          * extension in their ClientHello */
3604         if (!s->s3->next_proto_neg_seen)
3605                 {
3606                 SSLerr(SSL_F_SSL3_GET_NEXT_PROTO,SSL_R_GOT_NEXT_PROTO_WITHOUT_EXTENSION);
3607                 return -1;
3608                 }
3609
3610         /* See the payload format below */
3611         n=s->method->ssl_get_message(s,
3612                 SSL3_ST_SR_NEXT_PROTO_A,
3613                 SSL3_ST_SR_NEXT_PROTO_B,
3614                 SSL3_MT_NEXT_PROTO,
3615                 514,
3616                 &ok);
3617
3618         if (!ok)
3619                 return((int)n);
3620
3621         /* s->state doesn't reflect whether ChangeCipherSpec has been received
3622          * in this handshake, but s->s3->change_cipher_spec does (will be reset
3623          * by ssl3_get_finished). */
3624         if (!s->s3->change_cipher_spec)
3625                 {
3626                 SSLerr(SSL_F_SSL3_GET_NEXT_PROTO,SSL_R_GOT_NEXT_PROTO_BEFORE_A_CCS);
3627                 return -1;
3628                 }
3629
3630         if (n < 2)
3631                 return 0;  /* The body must be > 1 bytes long */
3632
3633         p=(unsigned char *)s->init_msg;
3634
3635         /*-
3636          * The payload looks like:
3637          *   uint8 proto_len;
3638          *   uint8 proto[proto_len];
3639          *   uint8 padding_len;
3640          *   uint8 padding[padding_len];
3641          */
3642         proto_len = p[0];
3643         if (proto_len + 2 > s->init_num)
3644                 return 0;
3645         padding_len = p[proto_len + 1];
3646         if (proto_len + padding_len + 2 != s->init_num)
3647                 return 0;
3648
3649         s->next_proto_negotiated = OPENSSL_malloc(proto_len);
3650         if (!s->next_proto_negotiated)
3651                 {
3652                 SSLerr(SSL_F_SSL3_GET_NEXT_PROTO,ERR_R_MALLOC_FAILURE);
3653                 return 0;
3654                 }
3655         memcpy(s->next_proto_negotiated, p + 1, proto_len);
3656         s->next_proto_negotiated_len = proto_len;
3657
3658         return 1;
3659         }
3660 # endif
3661
3662 #endif