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 &= ~SSL3_FLAGS_SGC_RESTART_DONE;
 304                         s->s3->flags &= ~TLS1_FLAGS_SKIP_CERT_VERIFY;
 305                         s->s3->flags &= ~SSL3_FLAGS_CCS_OK;
 306                         /* Should have been reset by ssl3_get_finished, too. */
 307                         s->s3->change_cipher_spec = 0;
 308
 309                         if (s->state != SSL_ST_RENEGOTIATE)
 310                                 {
 311                                 /* Ok, we now need to push on a buffering BIO so that
 312                                  * the output is sent in a way that TCP likes :-)
 313                                  */
 314                                 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
 315
 316                                 ssl3_init_finished_mac(s);
 317                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
 318                                 s->ctx->stats.sess_accept++;
 319                                 }
 320                         else if (!s->s3->send_connection_binding &&
 321                                 !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
 322                                 {
 323                                 /* Server attempting to renegotiate with
 324                                  * client that doesn't support secure
 325                                  * renegotiation.
 326                                  */
 327                                 SSLerr(SSL_F_SSL3_ACCEPT, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
 328                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
 329                                 ret = -1;
 330                                 goto end;
 331                                 }
 332                         else
 333                                 {
 334                                 /* s->state == SSL_ST_RENEGOTIATE,
 335                                  * we will just send a HelloRequest */
 336                                 s->ctx->stats.sess_accept_renegotiate++;
 337                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
 338                                 }
 339                         break;
 340
 341                 case SSL3_ST_SW_HELLO_REQ_A:
 342                 case SSL3_ST_SW_HELLO_REQ_B:
 343
 344                         s->shutdown=0;
 345                         ret=ssl3_send_hello_request(s);
 346                         if (ret <= 0) goto end;
 347                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
 348                         s->state=SSL3_ST_SW_FLUSH;
 349                         s->init_num=0;
 350
 351                         ssl3_init_finished_mac(s);
 352                         break;
 353
 354                 case SSL3_ST_SW_HELLO_REQ_C:
 355                         s->state=SSL_ST_OK;
 356                         break;
 357
 358                 case SSL3_ST_SR_CLNT_HELLO_A:
 359                 case SSL3_ST_SR_CLNT_HELLO_B:
 360                 case SSL3_ST_SR_CLNT_HELLO_C:
 361
 362                         s->shutdown=0;
 363                         ret=ssl3_get_client_hello(s);
 364                         if (ret <= 0) goto end;
 365 #ifndef OPENSSL_NO_SRP
 366                         s->state = SSL3_ST_SR_CLNT_HELLO_D;
 367                 case SSL3_ST_SR_CLNT_HELLO_D:
 368                         {
 369                         int al;
 370                         if ((ret = ssl_check_srp_ext_ClientHello(s,&al))  < 0)
 371                                         {
 372                                         /* callback indicates firther work to be done */
 373                                         s->rwstate=SSL_X509_LOOKUP;
 374                                         goto end;
 375                                         }
 376                         if (ret != SSL_ERROR_NONE)
 377                                 {
 378                                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
 379                                 /* This is not really an error but the only means to
 380                                    for a client to detect whether srp is supported. */
 381                                    if (al != TLS1_AD_UNKNOWN_PSK_IDENTITY)
 382                                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_CLIENTHELLO_TLSEXT);
 383                                 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
 384                                 ret= -1;
 385                                 goto end;
 386                                 }
 387                         }
 388 #endif
 389
 390                         s->renegotiate = 2;
 391                         s->state=SSL3_ST_SW_SRVR_HELLO_A;
 392                         s->init_num=0;
 393                         break;
 394
 395                 case SSL3_ST_SW_SRVR_HELLO_A:
 396                 case SSL3_ST_SW_SRVR_HELLO_B:
 397                         ret=ssl3_send_server_hello(s);
 398                         if (ret <= 0) goto end;
 399 #ifndef OPENSSL_NO_TLSEXT
 400                         if (s->hit)
 401                                 {
 402                                 if (s->tlsext_ticket_expected)
 403                                         s->state=SSL3_ST_SW_SESSION_TICKET_A;
 404                                 else
 405                                         s->state=SSL3_ST_SW_CHANGE_A;
 406                                 }
 407 #else
 408                         if (s->hit)
 409                                         s->state=SSL3_ST_SW_CHANGE_A;
 410 #endif
 411                         else
 412                                         s->state = SSL3_ST_SW_CERT_A;
 413                         s->init_num = 0;
 414                         break;
 415
 416                 case SSL3_ST_SW_CERT_A:
 417                 case SSL3_ST_SW_CERT_B:
 418                         /* Check if it is anon DH or anon ECDH, */
 419                         /* normal PSK or KRB5 or SRP */
 420                         if (!(s->s3->tmp.new_cipher->algorithm_auth & (SSL_aNULL|SSL_aKRB5|SSL_aSRP))
 421                                 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 422                                 {
 423                                 ret=ssl3_send_server_certificate(s);
 424                                 if (ret <= 0) goto end;
 425 #ifndef OPENSSL_NO_TLSEXT
 426                                 if (s->tlsext_status_expected)
 427                                         s->state=SSL3_ST_SW_CERT_STATUS_A;
 428                                 else
 429                                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 430                                 }
 431                         else
 432                                 {
 433                                 skip = 1;
 434                                 s->state=SSL3_ST_SW_KEY_EXCH_A;
 435                                 }
 436 #else
 437                                 }
 438                         else
 439                                 skip=1;
 440
 441                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 442 #endif
 443                         s->init_num=0;
 444                         break;
 445
 446                 case SSL3_ST_SW_KEY_EXCH_A:
 447                 case SSL3_ST_SW_KEY_EXCH_B:
 448                         alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
 449
 450                         /* clear this, it may get reset by
 451                          * send_server_key_exchange */
 452                         if ((s->options & SSL_OP_EPHEMERAL_RSA)
 453 #ifndef OPENSSL_NO_KRB5
 454                                 && !(alg_k & SSL_kKRB5)
 455 #endif /* OPENSSL_NO_KRB5 */
 456                                 )
 457                                 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
 458                                  * even when forbidden by protocol specs
 459                                  * (handshake may fail as clients are not required to
 460                                  * be able to handle this) */
 461                                 s->s3->tmp.use_rsa_tmp=1;
 462                         else
 463                                 s->s3->tmp.use_rsa_tmp=0;
 464
 465
 466                         /* only send if a DH key exchange, fortezza or
 467                          * RSA but we have a sign only certificate
 468                          *
 469                          * PSK: may send PSK identity hints
 470                          *
 471                          * For ECC ciphersuites, we send a serverKeyExchange
 472                          * message only if the cipher suite is either
 473                          * ECDH-anon or ECDHE. In other cases, the
 474                          * server certificate contains the server's
 475                          * public key for key exchange.
 476                          */
 477                         if (s->s3->tmp.use_rsa_tmp
 478                         /* PSK: send ServerKeyExchange if PSK identity
 479                          * hint if provided */
 480 #ifndef OPENSSL_NO_PSK
 481                             || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
 482 #endif
 483 #ifndef OPENSSL_NO_SRP
 484                             /* SRP: send ServerKeyExchange */
 485                             || (alg_k & SSL_kSRP)
 486 #endif
 487                             || (alg_k & SSL_kEDH)
 488                             || (alg_k & SSL_kEECDH)
 489                             || ((alg_k & SSL_kRSA)
 490                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
 491                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
 492                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
 493                                         )
 494                                     )
 495                                 )
 496                             )
 497                                 {
 498                                 ret=ssl3_send_server_key_exchange(s);
 499                                 if (ret <= 0) goto end;
 500                                 }
 501                         else
 502                                 skip=1;
 503
 504                         s->state=SSL3_ST_SW_CERT_REQ_A;
 505                         s->init_num=0;
 506                         break;
 507
 508                 case SSL3_ST_SW_CERT_REQ_A:
 509                 case SSL3_ST_SW_CERT_REQ_B:
 510                         if (/* don't request cert unless asked for it: */
 511                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
 512                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
 513                                  * don't request cert during re-negotiation: */
 514                                 ((s->session->peer != NULL) &&
 515                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
 516                                 /* never request cert in anonymous ciphersuites
 517                                  * (see section "Certificate request" in SSL 3 drafts
 518                                  * and in RFC 2246): */
 519                                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
 520                                  /* ... except when the application insists on verification
 521                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
 522                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
 523                                  /* never request cert in Kerberos ciphersuites */
 524                                 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5) ||
 525                                 /* don't request certificate for SRP auth */
 526                                 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aSRP)
 527                                 /* With normal PSK Certificates and
 528                                  * Certificate Requests are omitted */
 529                                 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 530                                 {
 531                                 /* no cert request */
 532                                 skip=1;
 533                                 s->s3->tmp.cert_request=0;
 534                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 535                                 if (s->s3->handshake_buffer)
 536                                         if (!ssl3_digest_cached_records(s))
 537                                                 return -1;
 538                                 }
 539                         else
 540                                 {
 541                                 s->s3->tmp.cert_request=1;
 542                                 ret=ssl3_send_certificate_request(s);
 543                                 if (ret <= 0) goto end;
 544 #ifndef NETSCAPE_HANG_BUG
 545                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 546 #else
 547                                 s->state=SSL3_ST_SW_FLUSH;
 548                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 549 #endif
 550                                 s->init_num=0;
 551                                 }
 552                         break;
 553
 554                 case SSL3_ST_SW_SRVR_DONE_A:
 555                 case SSL3_ST_SW_SRVR_DONE_B:
 556                         ret=ssl3_send_server_done(s);
 557                         if (ret <= 0) goto end;
 558                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 559                         s->state=SSL3_ST_SW_FLUSH;
 560                         s->init_num=0;
 561                         break;
 562
 563                 case SSL3_ST_SW_FLUSH:
 564
 565                         /* This code originally checked to see if
 566                          * any data was pending using BIO_CTRL_INFO
 567                          * and then flushed. This caused problems
 568                          * as documented in PR#1939. The proposed
 569                          * fix doesn't completely resolve this issue
 570                          * as buggy implementations of BIO_CTRL_PENDING
 571                          * still exist. So instead we just flush
 572                          * unconditionally.
 573                          */
 574
 575                         s->rwstate=SSL_WRITING;
 576                         if (BIO_flush(s->wbio) <= 0)
 577                                 {
 578                                 ret= -1;
 579                                 goto end;
 580                                 }
 581                         s->rwstate=SSL_NOTHING;
 582
 583                         s->state=s->s3->tmp.next_state;
 584                         break;
 585
 586                 case SSL3_ST_SR_CERT_A:
 587                 case SSL3_ST_SR_CERT_B:
 588                         /* Check for second client hello (MS SGC) */
 589                         ret = ssl3_check_client_hello(s);
 590                         if (ret <= 0)
 591                                 goto end;
 592                         if (ret == 2)
 593                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
 594                         else {
 595                                 if (s->s3->tmp.cert_request)
 596                                         {
 597                                         ret=ssl3_get_client_certificate(s);
 598                                         if (ret <= 0) goto end;
 599                                         }
 600                                 s->init_num=0;
 601                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
 602                         }
 603                         break;
 604
 605                 case SSL3_ST_SR_KEY_EXCH_A:
 606                 case SSL3_ST_SR_KEY_EXCH_B:
 607                         ret=ssl3_get_client_key_exchange(s);
 608                         if (ret <= 0)
 609                                 goto end;
 610                         if (ret == 2)
 611                                 {
 612                                 /* For the ECDH ciphersuites when
 613                                  * the client sends its ECDH pub key in
 614                                  * a certificate, the CertificateVerify
 615                                  * message is not sent.
 616                                  * Also for GOST ciphersuites when
 617                                  * the client uses its key from the certificate
 618                                  * for key exchange.
 619                                  */
 620 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
 621                                 s->state=SSL3_ST_SR_FINISHED_A;
 622 #else
 623                                 if (s->s3->next_proto_neg_seen)
 624                                         s->state=SSL3_ST_SR_NEXT_PROTO_A;
 625                                 else
 626                                         s->state=SSL3_ST_SR_FINISHED_A;
 627 #endif
 628                                 s->init_num = 0;
 629                                 }
 630                         else if (SSL_USE_SIGALGS(s))
 631                                 {
 632                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
 633                                 s->init_num=0;
 634                                 if (!s->session->peer)
 635                                         break;
 636                                 /* For sigalgs freeze the handshake buffer
 637                                  * at this point and digest cached records.
 638                                  */
 639                                 if (!s->s3->handshake_buffer)
 640                                         {
 641                                         SSLerr(SSL_F_SSL3_ACCEPT,ERR_R_INTERNAL_ERROR);
 642                                         return -1;
 643                                         }
 644                                 s->s3->flags |= TLS1_FLAGS_KEEP_HANDSHAKE;
 645                                 if (!ssl3_digest_cached_records(s))
 646                                         return -1;
 647                                 }
 648                         else
 649                                 {
 650                                 int offset=0;
 651                                 int dgst_num;
 652
 653                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
 654                                 s->init_num=0;
 655
 656                                 /* We need to get hashes here so if there is
 657                                  * a client cert, it can be verified
 658                                  * FIXME - digest processing for CertificateVerify
 659                                  * should be generalized. But it is next step
 660                                  */
 661                                 if (s->s3->handshake_buffer)
 662                                         if (!ssl3_digest_cached_records(s))
 663                                                 return -1;
 664                                 for (dgst_num=0; dgst_num<SSL_MAX_DIGEST;dgst_num++)
 665                                         if (s->s3->handshake_dgst[dgst_num])
 666                                                 {
 667                                                 int dgst_size;
 668
 669                                                 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]));
 670                                                 dgst_size=EVP_MD_CTX_size(s->s3->handshake_dgst[dgst_num]);
 671                                                 if (dgst_size < 0)
 672                                                         {
 673                                                         ret = -1;
 674                                                         goto end;
 675                                                         }
 676                                                 offset+=dgst_size;
 677                                                 }
 678                                 }
 679                         break;
 680
 681                 case SSL3_ST_SR_CERT_VRFY_A:
 682                 case SSL3_ST_SR_CERT_VRFY_B:
 683                         /*
 684                          * This *should* be the first time we enable CCS, but be
 685                          * extra careful about surrounding code changes. We need
 686                          * to set this here because we don't know if we're
 687                          * expecting a CertificateVerify or not.
 688                          */
 689                         if (!s->s3->change_cipher_spec)
 690                                 s->s3->flags |= SSL3_FLAGS_CCS_OK;
 691                         /* we should decide if we expected this one */
 692                         ret=ssl3_get_cert_verify(s);
 693                         if (ret <= 0) goto end;
 694
 695 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
 696                         s->state=SSL3_ST_SR_FINISHED_A;
 697 #else
 698                         if (s->s3->next_proto_neg_seen)
 699                                 s->state=SSL3_ST_SR_NEXT_PROTO_A;
 700                         else
 701                                 s->state=SSL3_ST_SR_FINISHED_A;
 702 #endif
 703                         s->init_num=0;
 704                         break;
 705
 706 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
 707                 case SSL3_ST_SR_NEXT_PROTO_A:
 708                 case SSL3_ST_SR_NEXT_PROTO_B:
 709                         /*
 710                          * Enable CCS for resumed handshakes with NPN.
 711                          * In a full handshake with NPN, we end up here through
 712                          * SSL3_ST_SR_CERT_VRFY_B, where SSL3_FLAGS_CCS_OK was
 713                          * already set. Receiving a CCS clears the flag, so make
 714                          * sure not to re-enable it to ban duplicates.
 715                          * s->s3->change_cipher_spec is set when a CCS is
 716                          * processed in s3_pkt.c, and remains set until
 717                          * the client's Finished message is read.
 718                          */
 719                         if (!s->s3->change_cipher_spec)
 720                                 s->s3->flags |= SSL3_FLAGS_CCS_OK;
 721
 722                         ret=ssl3_get_next_proto(s);
 723                         if (ret <= 0) goto end;
 724                         s->init_num = 0;
 725                         s->state=SSL3_ST_SR_FINISHED_A;
 726                         break;
 727 #endif
 728
 729                 case SSL3_ST_SR_FINISHED_A:
 730                 case SSL3_ST_SR_FINISHED_B:
 731                         /*
 732                          * Enable CCS for resumed handshakes without NPN.
 733                          * In a full handshake, we end up here through
 734                          * SSL3_ST_SR_CERT_VRFY_B, where SSL3_FLAGS_CCS_OK was
 735                          * already set. Receiving a CCS clears the flag, so make
 736                          * sure not to re-enable it to ban duplicates.
 737                          * s->s3->change_cipher_spec is set when a CCS is
 738                          * processed in s3_pkt.c, and remains set until
 739                          * the client's Finished message is read.
 740                          */
 741                         if (!s->s3->change_cipher_spec)
 742                                 s->s3->flags |= SSL3_FLAGS_CCS_OK;
 743                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
 744                                 SSL3_ST_SR_FINISHED_B);
 745                         if (ret <= 0) goto end;
 746                         if (s->hit)
 747                                 s->state=SSL_ST_OK;
 748 #ifndef OPENSSL_NO_TLSEXT
 749                         else if (s->tlsext_ticket_expected)
 750                                 s->state=SSL3_ST_SW_SESSION_TICKET_A;
 751 #endif
 752                         else
 753                                 s->state=SSL3_ST_SW_CHANGE_A;
 754                         s->init_num=0;
 755                         break;
 756
 757 #ifndef OPENSSL_NO_TLSEXT
 758                 case SSL3_ST_SW_SESSION_TICKET_A:
 759                 case SSL3_ST_SW_SESSION_TICKET_B:
 760                         ret=ssl3_send_newsession_ticket(s);
 761                         if (ret <= 0) goto end;
 762                         s->state=SSL3_ST_SW_CHANGE_A;
 763                         s->init_num=0;
 764                         break;
 765
 766                 case SSL3_ST_SW_CERT_STATUS_A:
 767                 case SSL3_ST_SW_CERT_STATUS_B:
 768                         ret=ssl3_send_cert_status(s);
 769                         if (ret <= 0) goto end;
 770                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 771                         s->init_num=0;
 772                         break;
 773
 774 #endif
 775
 776                 case SSL3_ST_SW_CHANGE_A:
 777                 case SSL3_ST_SW_CHANGE_B:
 778
 779                         s->session->cipher=s->s3->tmp.new_cipher;
 780                         if (!s->method->ssl3_enc->setup_key_block(s))
 781                                 { ret= -1; goto end; }
 782
 783                         ret=ssl3_send_change_cipher_spec(s,
 784                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
 785
 786                         if (ret <= 0) goto end;
 787                         s->state=SSL3_ST_SW_FINISHED_A;
 788                         s->init_num=0;
 789
 790                         if (!s->method->ssl3_enc->change_cipher_state(s,
 791                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
 792                                 {
 793                                 ret= -1;
 794                                 goto end;
 795                                 }
 796
 797                         break;
 798
 799                 case SSL3_ST_SW_FINISHED_A:
 800                 case SSL3_ST_SW_FINISHED_B:
 801                         ret=ssl3_send_finished(s,
 802                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
 803                                 s->method->ssl3_enc->server_finished_label,
 804                                 s->method->ssl3_enc->server_finished_label_len);
 805                         if (ret <= 0) goto end;
 806                         s->state=SSL3_ST_SW_FLUSH;
 807                         if (s->hit)
 808                                 {
 809 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
 810                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 811 #else
 812                                 if (s->s3->next_proto_neg_seen)
 813                                         {
 814                                         s->s3->tmp.next_state=SSL3_ST_SR_NEXT_PROTO_A;
 815                                         }
 816                                 else
 817                                         s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 818 #endif
 819                                 }
 820                         else
 821                                 s->s3->tmp.next_state=SSL_ST_OK;
 822                         s->init_num=0;
 823                         break;
 824
 825                 case SSL_ST_OK:
 826                         /* clean a few things up */
 827                         ssl3_cleanup_key_block(s);
 828
 829                         BUF_MEM_free(s->init_buf);
 830                         s->init_buf=NULL;
 831
 832                         /* remove buffering on output */
 833                         ssl_free_wbio_buffer(s);
 834
 835                         s->init_num=0;
 836
 837                         if (s->renegotiate == 2) /* skipped if we just sent a HelloRequest */
 838                                 {
 839                                 s->renegotiate=0;
 840                                 s->new_session=0;
 841
 842                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 843
 844                                 s->ctx->stats.sess_accept_good++;
 845                                 /* s->server=1; */
 846                                 s->handshake_func=ssl3_accept;
 847
 848                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 849                                 }
 850
 851                         ret = 1;
 852                         goto end;
 853                         /* break; */
 854
 855                 default:
 856                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
 857                         ret= -1;
 858                         goto end;
 859                         /* break; */
 860                         }
 861
 862                 if (!s->s3->tmp.reuse_message && !skip)
 863                         {
 864                         if (s->debug)
 865                                 {
 866                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 867                                         goto end;
 868                                 }
 869
 870
 871                         if ((cb != NULL) && (s->state != state))
 872                                 {
 873                                 new_state=s->state;
 874                                 s->state=state;
 875                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
 876                                 s->state=new_state;
 877                                 }
 878                         }
 879                 skip=0;
 880                 }
 881 end:
 882         /* BIO_flush(s->wbio); */
 883
 884         s->in_handshake--;
 885         if (cb != NULL)
 886                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 887         return(ret);
 888         }
 889
 890 int ssl3_send_hello_request(SSL *s)
 891         {
 892
 893         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
 894                 {
 895                 ssl_set_handshake_header(s, SSL3_MT_HELLO_REQUEST, 0);
 896                 s->state=SSL3_ST_SW_HELLO_REQ_B;
 897                 }
 898
 899         /* SSL3_ST_SW_HELLO_REQ_B */
 900         return ssl_do_write(s);
 901         }
 902
 903 int ssl3_check_client_hello(SSL *s)
 904         {
 905         int ok;
 906         long n;
 907
 908         /* this function is called when we really expect a Certificate message,
 909          * so permit appropriate message length */
 910         n=s->method->ssl_get_message(s,
 911                 SSL3_ST_SR_CERT_A,
 912                 SSL3_ST_SR_CERT_B,
 913                 -1,
 914                 s->max_cert_list,
 915                 &ok);
 916         if (!ok) return((int)n);
 917         s->s3->tmp.reuse_message = 1;
 918         if (s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO)
 919                 {
 920                 /* We only allow the client to restart the handshake once per
 921                  * negotiation. */
 922                 if (s->s3->flags & SSL3_FLAGS_SGC_RESTART_DONE)
 923                         {
 924                         SSLerr(SSL_F_SSL3_CHECK_CLIENT_HELLO, SSL_R_MULTIPLE_SGC_RESTARTS);
 925                         return -1;
 926                         }
 927                 /* Throw away what we have done so far in the current handshake,
 928                  * which will now be aborted. (A full SSL_clear would be too much.) */
 929 #ifndef OPENSSL_NO_DH
 930                 if (s->s3->tmp.dh != NULL)
 931                         {
 932                         DH_free(s->s3->tmp.dh);
 933                         s->s3->tmp.dh = NULL;
 934                         }
 935 #endif
 936 #ifndef OPENSSL_NO_ECDH
 937                 if (s->s3->tmp.ecdh != NULL)
 938                         {
 939                         EC_KEY_free(s->s3->tmp.ecdh);
 940                         s->s3->tmp.ecdh = NULL;
 941                         }
 942 #endif
 943                 s->s3->flags |= SSL3_FLAGS_SGC_RESTART_DONE;
 944                 return 2;
 945                 }
 946         return 1;
 947 }
 948
 949 int ssl3_get_client_hello(SSL *s)
 950         {
 951         int i,j,ok,al=SSL_AD_INTERNAL_ERROR,ret= -1;
 952         unsigned int cookie_len;
 953         long n;
 954         unsigned long id;
 955         unsigned char *p,*d;
 956         SSL_CIPHER *c;
 957 #ifndef OPENSSL_NO_COMP
 958         unsigned char *q;
 959         SSL_COMP *comp=NULL;
 960 #endif
 961         STACK_OF(SSL_CIPHER) *ciphers=NULL;
 962
 963         if (s->state == SSL3_ST_SR_CLNT_HELLO_C && !s->first_packet)
 964                 goto retry_cert;
 965
 966         /* We do this so that we will respond with our native type.
 967          * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
 968          * This down switching should be handled by a different method.
 969          * If we are SSLv3, we will respond with SSLv3, even if prompted with
 970          * TLSv1.
 971          */
 972         if (s->state == SSL3_ST_SR_CLNT_HELLO_A
 973                 )
 974                 {
 975                 s->state=SSL3_ST_SR_CLNT_HELLO_B;
 976                 }
 977         s->first_packet=1;
 978         n=s->method->ssl_get_message(s,
 979                 SSL3_ST_SR_CLNT_HELLO_B,
 980                 SSL3_ST_SR_CLNT_HELLO_C,
 981                 SSL3_MT_CLIENT_HELLO,
 982                 SSL3_RT_MAX_PLAIN_LENGTH,
 983                 &ok);
 984
 985         if (!ok) return((int)n);
 986         s->first_packet=0;
 987         d=p=(unsigned char *)s->init_msg;
 988
 989         /* use version from inside client hello, not from record header
 990          * (may differ: see RFC 2246, Appendix E, second paragraph) */
 991         s->client_version=(((int)p[0])<<8)|(int)p[1];
 992         p+=2;
 993
 994         if (SSL_IS_DTLS(s)  ?   (s->client_version > s->version &&
 995                                  s->method->version != DTLS_ANY_VERSION)
 996                             :   (s->client_version < s->version))
 997                 {
 998                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER);
 999                 if ((s->client_version>>8) == SSL3_VERSION_MAJOR &&
1000                         !s->enc_write_ctx && !s->write_hash)
1001                         {
1002                         /* similar to ssl3_get_record, send alert using remote version number */
1003                         s->version = s->client_version;
1004                         }
1005                 al = SSL_AD_PROTOCOL_VERSION;
1006                 goto f_err;
1007                 }
1008
1009         /* If we require cookies and this ClientHello doesn't
1010          * contain one, just return since we do not want to
1011          * allocate any memory yet. So check cookie length...
1012          */
1013         if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)
1014                 {
1015                 unsigned int session_length, cookie_length;
1016
1017                 session_length = *(p + SSL3_RANDOM_SIZE);
1018                 cookie_length = *(p + SSL3_RANDOM_SIZE + session_length + 1);
1019
1020                 if (cookie_length == 0)
1021                         return 1;
1022                 }
1023
1024         /* load the client random */
1025         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
1026         p+=SSL3_RANDOM_SIZE;
1027
1028         /* get the session-id */
1029         j= *(p++);
1030
1031         s->hit=0;
1032         /* Versions before 0.9.7 always allow clients to resume sessions in renegotiation.
1033          * 0.9.7 and later allow this by default, but optionally ignore resumption requests
1034          * with flag SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION (it's a new flag rather
1035          * than a change to default behavior so that applications relying on this for security
1036          * won't even compile against older library versions).
1037          *
1038          * 1.0.1 and later also have a function SSL_renegotiate_abbreviated() to request
1039          * renegotiation but not a new session (s->new_session remains unset): for servers,
1040          * this essentially just means that the SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
1041          * setting will be ignored.
1042          */
1043         if ((s->new_session && (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION)))
1044                 {
1045                 if (!ssl_get_new_session(s,1))
1046                         goto err;
1047                 }
1048         else
1049                 {
1050                 i=ssl_get_prev_session(s, p, j, d + n);
1051                 /*
1052                  * Only resume if the session's version matches the negotiated
1053                  * version.
1054                  * RFC 5246 does not provide much useful advice on resumption
1055                  * with a different protocol version. It doesn't forbid it but
1056                  * the sanity of such behaviour would be questionable.
1057                  * In practice, clients do not accept a version mismatch and
1058                  * will abort the handshake with an error.
1059                  */
1060                 if (i == 1 && s->version == s->session->ssl_version)
1061                         { /* previous session */
1062                         s->hit=1;
1063                         }
1064                 else if (i == -1)
1065                         goto err;
1066                 else /* i == 0 */
1067                         {
1068                         if (!ssl_get_new_session(s,1))
1069                                 goto err;
1070                         }
1071                 }
1072
1073         p+=j;
1074
1075         if (SSL_IS_DTLS(s))
1076                 {
1077                 /* cookie stuff */
1078                 cookie_len = *(p++);
1079
1080                 /*
1081                  * The ClientHello may contain a cookie even if the
1082                  * HelloVerify message has not been sent--make sure that it
1083                  * does not cause an overflow.
1084                  */
1085                 if ( cookie_len > sizeof(s->d1->rcvd_cookie))
1086                         {
1087                         /* too much data */
1088                         al = SSL_AD_DECODE_ERROR;
1089                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
1090                         goto f_err;
1091                         }
1092
1093                 /* verify the cookie if appropriate option is set. */
1094                 if ((SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) &&
1095                         cookie_len > 0)
1096                         {
1097                         memcpy(s->d1->rcvd_cookie, p, cookie_len);
1098
1099                         if ( s->ctx->app_verify_cookie_cb != NULL)
1100                                 {
1101                                 if ( s->ctx->app_verify_cookie_cb(s, s->d1->rcvd_cookie,
1102                                         cookie_len) == 0)
1103                                         {
1104                                         al=SSL_AD_HANDSHAKE_FAILURE;
1105                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
1106                                                 SSL_R_COOKIE_MISMATCH);
1107                                         goto f_err;
1108                                         }
1109                                 /* else cookie verification succeeded */
1110                                 }
1111                         else if ( memcmp(s->d1->rcvd_cookie, s->d1->cookie,
1112                                                   s->d1->cookie_len) != 0) /* default verification */
1113                                 {
1114                                         al=SSL_AD_HANDSHAKE_FAILURE;
1115                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
1116                                                 SSL_R_COOKIE_MISMATCH);
1117                                         goto f_err;
1118                                 }
1119                         /* Set to -2 so if successful we return 2 */
1120                         ret = -2;
1121                         }
1122
1123                 p += cookie_len;
1124                 if (s->method->version == DTLS_ANY_VERSION)
1125                         {
1126                         /* Select version to use */
1127                         if (s->client_version <= DTLS1_2_VERSION &&
1128                                 !(s->options & SSL_OP_NO_DTLSv1_2))
1129                                 {
1130                                 s->version = DTLS1_2_VERSION;
1131                                 s->method = DTLSv1_2_server_method();
1132                                 }
1133                         else if (tls1_suiteb(s))
1134                                 {
1135                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_ONLY_DTLS_1_2_ALLOWED_IN_SUITEB_MODE);
1136                                 s->version = s->client_version;
1137                                 al = SSL_AD_PROTOCOL_VERSION;
1138                                 goto f_err;
1139                                 }
1140                         else if (s->client_version <= DTLS1_VERSION &&
1141                                 !(s->options & SSL_OP_NO_DTLSv1))
1142                                 {
1143                                 s->version = DTLS1_VERSION;
1144                                 s->method = DTLSv1_server_method();
1145                                 }
1146                         else
1147                                 {
1148                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER);
1149                                 s->version = s->client_version;
1150                                 al = SSL_AD_PROTOCOL_VERSION;
1151                                 goto f_err;
1152                                 }
1153                         s->session->ssl_version = s->version;
1154                         }
1155                 }
1156
1157         n2s(p,i);
1158         if ((i == 0) && (j != 0))
1159                 {
1160                 /* we need a cipher if we are not resuming a session */
1161                 al=SSL_AD_ILLEGAL_PARAMETER;
1162                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
1163                 goto f_err;
1164                 }
1165         if ((p+i) >= (d+n))
1166                 {
1167                 /* not enough data */
1168                 al=SSL_AD_DECODE_ERROR;
1169                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
1170                 goto f_err;
1171                 }
1172         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
1173                 == NULL))
1174                 {
1175                 goto err;
1176                 }
1177         p+=i;
1178
1179         /* If it is a hit, check that the cipher is in the list */
1180         if ((s->hit) && (i > 0))
1181                 {
1182                 j=0;
1183                 id=s->session->cipher->id;
1184
1185 #ifdef CIPHER_DEBUG
1186                 fprintf(stderr,"client sent %d ciphers\n",sk_SSL_CIPHER_num(ciphers));
1187 #endif
1188                 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
1189                         {
1190                         c=sk_SSL_CIPHER_value(ciphers,i);
1191 #ifdef CIPHER_DEBUG
1192                         fprintf(stderr,"client [%2d of %2d]:%s\n",
1193                                 i,sk_SSL_CIPHER_num(ciphers),
1194                                 SSL_CIPHER_get_name(c));
1195 #endif
1196                         if (c->id == id)
1197                                 {
1198                                 j=1;
1199                                 break;
1200                                 }
1201                         }
1202 /* Disabled because it can be used in a ciphersuite downgrade
1203  * attack: CVE-2010-4180.
1204  */
1205 #if 0
1206                 if (j == 0 && (s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
1207                         {
1208                         /* Special case as client bug workaround: the previously used cipher may
1209                          * not be in the current list, the client instead might be trying to
1210                          * continue using a cipher that before wasn't chosen due to server
1211                          * preferences.  We'll have to reject the connection if the cipher is not
1212                          * enabled, though. */
1213                         c = sk_SSL_CIPHER_value(ciphers, 0);
1214                         if (sk_SSL_CIPHER_find(SSL_get_ciphers(s), c) >= 0)
1215                                 {
1216                                 s->session->cipher = c;
1217                                 j = 1;
1218                                 }
1219                         }
1220 #endif
1221                 if (j == 0)
1222                         {
1223                         /* we need to have the cipher in the cipher
1224                          * list if we are asked to reuse it */
1225                         al=SSL_AD_ILLEGAL_PARAMETER;
1226                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
1227                         goto f_err;
1228                         }
1229                 }
1230
1231         /* compression */
1232         i= *(p++);
1233         if ((p+i) > (d+n))
1234                 {
1235                 /* not enough data */
1236                 al=SSL_AD_DECODE_ERROR;
1237                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
1238                 goto f_err;
1239                 }
1240 #ifndef OPENSSL_NO_COMP
1241         q=p;
1242 #endif
1243         for (j=0; j<i; j++)
1244                 {
1245                 if (p[j] == 0) break;
1246                 }
1247
1248         p+=i;
1249         if (j >= i)
1250                 {
1251                 /* no compress */
1252                 al=SSL_AD_DECODE_ERROR;
1253                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
1254                 goto f_err;
1255                 }
1256
1257 #ifndef OPENSSL_NO_TLSEXT
1258         /* TLS extensions*/
1259         if (s->version >= SSL3_VERSION)
1260                 {
1261                 if (!ssl_parse_clienthello_tlsext(s,&p,d,n))
1262                         {
1263                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_PARSE_TLSEXT);
1264                         goto err;
1265                         }
1266                 }
1267
1268         /* Check if we want to use external pre-shared secret for this
1269          * handshake for not reused session only. We need to generate
1270          * server_random before calling tls_session_secret_cb in order to allow
1271          * SessionTicket processing to use it in key derivation. */
1272         {
1273                 unsigned char *pos;
1274                 pos=s->s3->server_random;
1275                 if (ssl_fill_hello_random(s, 1, pos, SSL3_RANDOM_SIZE) <= 0)
1276                         {
1277                         goto f_err;
1278                         }
1279         }
1280
1281         if (!s->hit && s->version >= TLS1_VERSION && s->tls_session_secret_cb)
1282                 {
1283                 SSL_CIPHER *pref_cipher=NULL;
1284
1285                 s->session->master_key_length=sizeof(s->session->master_key);
1286                 if(s->tls_session_secret_cb(s, s->session->master_key, &s->session->master_key_length,
1287                         ciphers, &pref_cipher, s->tls_session_secret_cb_arg))
1288                         {
1289                         s->hit=1;
1290                         s->session->ciphers=ciphers;
1291                         s->session->verify_result=X509_V_OK;
1292
1293                         ciphers=NULL;
1294
1295                         /* check if some cipher was preferred by call back */
1296                         pref_cipher=pref_cipher ? pref_cipher : ssl3_choose_cipher(s, s->session->ciphers, SSL_get_ciphers(s));
1297                         if (pref_cipher == NULL)
1298                                 {
1299                                 al=SSL_AD_HANDSHAKE_FAILURE;
1300                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1301                                 goto f_err;
1302                                 }
1303
1304                         s->session->cipher=pref_cipher;
1305
1306                         if (s->cipher_list)
1307                                 sk_SSL_CIPHER_free(s->cipher_list);
1308
1309                         if (s->cipher_list_by_id)
1310                                 sk_SSL_CIPHER_free(s->cipher_list_by_id);
1311
1312                         s->cipher_list = sk_SSL_CIPHER_dup(s->session->ciphers);
1313                         s->cipher_list_by_id = sk_SSL_CIPHER_dup(s->session->ciphers);
1314                         }
1315                 }
1316 #endif
1317
1318         /* Worst case, we will use the NULL compression, but if we have other
1319          * options, we will now look for them.  We have i-1 compression
1320          * algorithms from the client, starting at q. */
1321         s->s3->tmp.new_compression=NULL;
1322 #ifndef OPENSSL_NO_COMP
1323         /* This only happens if we have a cache hit */
1324         if (s->session->compress_meth != 0)
1325                 {
1326                 int m, comp_id = s->session->compress_meth;
1327                 /* Perform sanity checks on resumed compression algorithm */
1328                 /* Can't disable compression */
1329                 if (s->options & SSL_OP_NO_COMPRESSION)
1330                         {
1331                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1332                         goto f_err;
1333                         }
1334                 /* Look for resumed compression method */
1335                 for (m = 0; m < sk_SSL_COMP_num(s->ctx->comp_methods); m++)
1336                         {
1337                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1338                         if (comp_id == comp->id)
1339                                 {
1340                                 s->s3->tmp.new_compression=comp;
1341                                 break;
1342                                 }
1343                         }
1344                 if (s->s3->tmp.new_compression == NULL)
1345                         {
1346                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INVALID_COMPRESSION_ALGORITHM);
1347                         goto f_err;
1348                         }
1349                 /* Look for resumed method in compression list */
1350                 for (m = 0; m < i; m++)
1351                         {
1352                         if (q[m] == comp_id)
1353                                 break;
1354                         }
1355                 if (m >= i)
1356                         {
1357                         al=SSL_AD_ILLEGAL_PARAMETER;
1358                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_COMPRESSSION_ALGORITHM_MISSING);
1359                         goto f_err;
1360                         }
1361                 }
1362         else if (s->hit)
1363                 comp = NULL;
1364         else if (!(s->options & SSL_OP_NO_COMPRESSION) && s->ctx->comp_methods)
1365                 { /* See if we have a match */
1366                 int m,nn,o,v,done=0;
1367
1368                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
1369                 for (m=0; m<nn; m++)
1370                         {
1371                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1372                         v=comp->id;
1373                         for (o=0; o<i; o++)
1374                                 {
1375                                 if (v == q[o])
1376                                         {
1377                                         done=1;
1378                                         break;
1379                                         }
1380                                 }
1381                         if (done) break;
1382                         }
1383                 if (done)
1384                         s->s3->tmp.new_compression=comp;
1385                 else
1386                         comp=NULL;
1387                 }
1388 #else
1389         /* If compression is disabled we'd better not try to resume a session
1390          * using compression.
1391          */
1392         if (s->session->compress_meth != 0)
1393                 {
1394                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1395                 goto f_err;
1396                 }
1397 #endif
1398
1399         /* Given s->session->ciphers and SSL_get_ciphers, we must
1400          * pick a cipher */
1401
1402         if (!s->hit)
1403                 {
1404 #ifdef OPENSSL_NO_COMP
1405                 s->session->compress_meth=0;
1406 #else
1407                 s->session->compress_meth=(comp == NULL)?0:comp->id;
1408 #endif
1409                 if (s->session->ciphers != NULL)
1410                         sk_SSL_CIPHER_free(s->session->ciphers);
1411                 s->session->ciphers=ciphers;
1412                 if (ciphers == NULL)
1413                         {
1414                         al=SSL_AD_ILLEGAL_PARAMETER;
1415                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
1416                         goto f_err;
1417                         }
1418                 ciphers=NULL;
1419                 if (!tls1_set_server_sigalgs(s))
1420                         {
1421                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT);
1422                         goto err;
1423                         }
1424                 /* Let cert callback update server certificates if required */
1425                 retry_cert:
1426                 if (s->cert->cert_cb)
1427                         {
1428                         int rv = s->cert->cert_cb(s, s->cert->cert_cb_arg);
1429                         if (rv == 0)
1430                                 {
1431                                 al=SSL_AD_INTERNAL_ERROR;
1432                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_CERT_CB_ERROR);
1433                                 goto f_err;
1434                                 }
1435                         if (rv < 0)
1436                                 {
1437                                 s->rwstate=SSL_X509_LOOKUP;
1438                                 return -1;
1439                                 }
1440                         s->rwstate = SSL_NOTHING;
1441                         }
1442                 c=ssl3_choose_cipher(s,s->session->ciphers,
1443                                      SSL_get_ciphers(s));
1444
1445                 if (c == NULL)
1446                         {
1447                         al=SSL_AD_HANDSHAKE_FAILURE;
1448                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1449                         goto f_err;
1450                         }
1451                 s->s3->tmp.new_cipher=c;
1452                 }
1453         else
1454                 {
1455                 /* Session-id reuse */
1456 #ifdef REUSE_CIPHER_BUG
1457                 STACK_OF(SSL_CIPHER) *sk;
1458                 SSL_CIPHER *nc=NULL;
1459                 SSL_CIPHER *ec=NULL;
1460
1461                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
1462                         {
1463                         sk=s->session->ciphers;
1464                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
1465                                 {
1466                                 c=sk_SSL_CIPHER_value(sk,i);
1467                                 if (c->algorithm_enc & SSL_eNULL)
1468                                         nc=c;
1469                                 if (SSL_C_IS_EXPORT(c))
1470                                         ec=c;
1471                                 }
1472                         if (nc != NULL)
1473                                 s->s3->tmp.new_cipher=nc;
1474                         else if (ec != NULL)
1475                                 s->s3->tmp.new_cipher=ec;
1476                         else
1477                                 s->s3->tmp.new_cipher=s->session->cipher;
1478                         }
1479                 else
1480 #endif
1481                 s->s3->tmp.new_cipher=s->session->cipher;
1482                 }
1483
1484         if (!SSL_USE_SIGALGS(s) || !(s->verify_mode & SSL_VERIFY_PEER))
1485                 {
1486                 if (!ssl3_digest_cached_records(s))
1487                         goto f_err;
1488                 }
1489
1490         /* we now have the following setup.
1491          * client_random
1492          * cipher_list          - our prefered list of ciphers
1493          * ciphers              - the clients prefered list of ciphers
1494          * compression          - basically ignored right now
1495          * ssl version is set   - sslv3
1496          * s->session           - The ssl session has been setup.
1497          * s->hit               - session reuse flag
1498          * s->tmp.new_cipher    - the new cipher to use.
1499          */
1500
1501         /* Handles TLS extensions that we couldn't check earlier */
1502         if (s->version >= SSL3_VERSION)
1503                 {
1504                 if (ssl_check_clienthello_tlsext_late(s) <= 0)
1505                         {
1506                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT);
1507                         goto err;
1508                         }
1509                 }
1510
1511         if (ret < 0) ret=-ret;
1512         if (0)
1513                 {
1514 f_err:
1515                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1516                 }
1517 err:
1518         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
1519         return ret < 0 ? -1 : ret;
1520         }
1521
1522 int ssl3_send_server_hello(SSL *s)
1523         {
1524         unsigned char *buf;
1525         unsigned char *p,*d;
1526         int i,sl;
1527         int al = 0;
1528         unsigned long l;
1529
1530         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
1531                 {
1532                 buf=(unsigned char *)s->init_buf->data;
1533 #ifdef OPENSSL_NO_TLSEXT
1534                 p=s->s3->server_random;
1535                 if (ssl_fill_hello_random(s, 1, p, SSL3_RANDOM_SIZE) <= 0)
1536                         return -1;
1537 #endif
1538                 /* Do the message type and length last */
1539                 d=p= ssl_handshake_start(s);
1540
1541                 *(p++)=s->version>>8;
1542                 *(p++)=s->version&0xff;
1543
1544                 /* Random stuff */
1545                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
1546                 p+=SSL3_RANDOM_SIZE;
1547
1548                 /* There are several cases for the session ID to send
1549                  * back in the server hello:
1550                  * - For session reuse from the session cache,
1551                  *   we send back the old session ID.
1552                  * - If stateless session reuse (using a session ticket)
1553                  *   is successful, we send back the client's "session ID"
1554                  *   (which doesn't actually identify the session).
1555                  * - If it is a new session, we send back the new
1556                  *   session ID.
1557                  * - However, if we want the new session to be single-use,
1558                  *   we send back a 0-length session ID.
1559                  * s->hit is non-zero in either case of session reuse,
1560                  * so the following won't overwrite an ID that we're supposed
1561                  * to send back.
1562                  */
1563                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)
1564                         && !s->hit)
1565                         s->session->session_id_length=0;
1566
1567                 sl=s->session->session_id_length;
1568                 if (sl > (int)sizeof(s->session->session_id))
1569                         {
1570                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1571                         return -1;
1572                         }
1573                 *(p++)=sl;
1574                 memcpy(p,s->session->session_id,sl);
1575                 p+=sl;
1576
1577                 /* put the cipher */
1578                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
1579                 p+=i;
1580
1581                 /* put the compression method */
1582 #ifdef OPENSSL_NO_COMP
1583                         *(p++)=0;
1584 #else
1585                 if (s->s3->tmp.new_compression == NULL)
1586                         *(p++)=0;
1587                 else
1588                         *(p++)=s->s3->tmp.new_compression->id;
1589 #endif
1590 #ifndef OPENSSL_NO_TLSEXT
1591                 if (ssl_prepare_serverhello_tlsext(s) <= 0)
1592                         {
1593                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
1594                         return -1;
1595                         }
1596                 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH, &al)) == NULL)
1597                         {
1598                         ssl3_send_alert(s, SSL3_AL_FATAL, al);
1599                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
1600                         return -1;
1601                         }
1602 #endif
1603                 /* do the header */
1604                 l=(p-d);
1605                 ssl_set_handshake_header(s, SSL3_MT_SERVER_HELLO, l);
1606                 s->state=SSL3_ST_SW_SRVR_HELLO_B;
1607                 }
1608
1609         /* SSL3_ST_SW_SRVR_HELLO_B */
1610         return ssl_do_write(s);
1611         }
1612
1613 int ssl3_send_server_done(SSL *s)
1614         {
1615
1616         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1617                 {
1618                 ssl_set_handshake_header(s, SSL3_MT_SERVER_DONE, 0);
1619                 s->state = SSL3_ST_SW_SRVR_DONE_B;
1620                 }
1621
1622         /* SSL3_ST_SW_SRVR_DONE_B */
1623         return ssl_do_write(s);
1624         }
1625
1626 int ssl3_send_server_key_exchange(SSL *s)
1627         {
1628 #ifndef OPENSSL_NO_RSA
1629         unsigned char *q;
1630         int j,num;
1631         RSA *rsa;
1632         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1633         unsigned int u;
1634 #endif
1635 #ifndef OPENSSL_NO_DH
1636         DH *dh=NULL,*dhp;
1637 #endif
1638 #ifndef OPENSSL_NO_ECDH
1639         EC_KEY *ecdh=NULL, *ecdhp;
1640         unsigned char *encodedPoint = NULL;
1641         int encodedlen = 0;
1642         int curve_id = 0;
1643         BN_CTX *bn_ctx = NULL;
1644 #endif
1645         EVP_PKEY *pkey;
1646         const EVP_MD *md = NULL;
1647         unsigned char *p,*d;
1648         int al,i;
1649         unsigned long type;
1650         int n;
1651         CERT *cert;
1652         BIGNUM *r[4];
1653         int nr[4],kn;
1654         BUF_MEM *buf;
1655         EVP_MD_CTX md_ctx;
1656
1657         EVP_MD_CTX_init(&md_ctx);
1658         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1659                 {
1660                 type=s->s3->tmp.new_cipher->algorithm_mkey;
1661                 cert=s->cert;
1662
1663                 buf=s->init_buf;
1664
1665                 r[0]=r[1]=r[2]=r[3]=NULL;
1666                 n=0;
1667 #ifndef OPENSSL_NO_RSA
1668                 if (type & SSL_kRSA)
1669                         {
1670                         rsa=cert->rsa_tmp;
1671                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1672                                 {
1673                                 rsa=s->cert->rsa_tmp_cb(s,
1674                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1675                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1676                                 if(rsa == NULL)
1677                                 {
1678                                         al=SSL_AD_HANDSHAKE_FAILURE;
1679                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1680                                         goto f_err;
1681                                 }
1682                                 RSA_up_ref(rsa);
1683                                 cert->rsa_tmp=rsa;
1684                                 }
1685                         if (rsa == NULL)
1686                                 {
1687                                 al=SSL_AD_HANDSHAKE_FAILURE;
1688                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1689                                 goto f_err;
1690                                 }
1691                         r[0]=rsa->n;
1692                         r[1]=rsa->e;
1693                         s->s3->tmp.use_rsa_tmp=1;
1694                         }
1695                 else
1696 #endif
1697 #ifndef OPENSSL_NO_DH
1698                         if (type & SSL_kEDH)
1699                         {
1700                         dhp=cert->dh_tmp;
1701                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1702                                 dhp=s->cert->dh_tmp_cb(s,
1703                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1704                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1705                         if (dhp == NULL)
1706                                 {
1707                                 al=SSL_AD_HANDSHAKE_FAILURE;
1708                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1709                                 goto f_err;
1710                                 }
1711
1712                         if (s->s3->tmp.dh != NULL)
1713                                 {
1714                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1715                                 goto err;
1716                                 }
1717
1718                         if ((dh=DHparams_dup(dhp)) == NULL)
1719                                 {
1720                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1721                                 goto err;
1722                                 }
1723
1724                         s->s3->tmp.dh=dh;
1725                         if ((dhp->pub_key == NULL ||
1726                              dhp->priv_key == NULL ||
1727                              (s->options & SSL_OP_SINGLE_DH_USE)))
1728                                 {
1729                                 if(!DH_generate_key(dh))
1730                                     {
1731                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1732                                            ERR_R_DH_LIB);
1733                                     goto err;
1734                                     }
1735                                 }
1736                         else
1737                                 {
1738                                 dh->pub_key=BN_dup(dhp->pub_key);
1739                                 dh->priv_key=BN_dup(dhp->priv_key);
1740                                 if ((dh->pub_key == NULL) ||
1741                                         (dh->priv_key == NULL))
1742                                         {
1743                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1744                                         goto err;
1745                                         }
1746                                 }
1747                         r[0]=dh->p;
1748                         r[1]=dh->g;
1749                         r[2]=dh->pub_key;
1750                         }
1751                 else
1752 #endif
1753 #ifndef OPENSSL_NO_ECDH
1754                         if (type & SSL_kEECDH)
1755                         {
1756                         const EC_GROUP *group;
1757
1758                         ecdhp=cert->ecdh_tmp;
1759                         if (s->cert->ecdh_tmp_auto)
1760                                 {
1761                                 /* Get NID of appropriate shared curve */
1762                                 int nid = tls1_shared_curve(s, -2);
1763                                 if (nid != NID_undef)
1764                                         ecdhp = EC_KEY_new_by_curve_name(nid);
1765                                 }
1766                         else if ((ecdhp == NULL) && s->cert->ecdh_tmp_cb)
1767                                 {
1768                                 ecdhp=s->cert->ecdh_tmp_cb(s,
1769                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1770                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1771                                 }
1772                         if (ecdhp == NULL)
1773                                 {
1774                                 al=SSL_AD_HANDSHAKE_FAILURE;
1775                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1776                                 goto f_err;
1777                                 }
1778
1779                         if (s->s3->tmp.ecdh != NULL)
1780                                 {
1781                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1782                                 goto err;
1783                                 }
1784
1785                         /* Duplicate the ECDH structure. */
1786                         if (ecdhp == NULL)
1787                                 {
1788                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1789                                 goto err;
1790                                 }
1791                         if (s->cert->ecdh_tmp_auto)
1792                                 ecdh = ecdhp;
1793                         else if ((ecdh = EC_KEY_dup(ecdhp)) == NULL)
1794                                 {
1795                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1796                                 goto err;
1797                                 }
1798
1799                         s->s3->tmp.ecdh=ecdh;
1800                         if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1801                             (EC_KEY_get0_private_key(ecdh) == NULL) ||
1802                             (s->options & SSL_OP_SINGLE_ECDH_USE))
1803                                 {
1804                                 if(!EC_KEY_generate_key(ecdh))
1805                                     {
1806                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1807                                     goto err;
1808                                     }
1809                                 }
1810
1811                         if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1812                             (EC_KEY_get0_public_key(ecdh)  == NULL) ||
1813                             (EC_KEY_get0_private_key(ecdh) == NULL))
1814                                 {
1815                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1816                                 goto err;
1817                                 }
1818
1819                         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1820                             (EC_GROUP_get_degree(group) > 163))
1821                                 {
1822                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1823                                 goto err;
1824                                 }
1825
1826                         /* XXX: For now, we only support ephemeral ECDH
1827                          * keys over named (not generic) curves. For
1828                          * supported named curves, curve_id is non-zero.
1829                          */
1830                         if ((curve_id =
1831                             tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1832                             == 0)
1833                                 {
1834                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1835                                 goto err;
1836                                 }
1837
1838                         /* Encode the public key.
1839                          * First check the size of encoding and
1840                          * allocate memory accordingly.
1841                          */
1842                         encodedlen = EC_POINT_point2oct(group,
1843                             EC_KEY_get0_public_key(ecdh),
1844                             POINT_CONVERSION_UNCOMPRESSED,
1845                             NULL, 0, NULL);
1846
1847                         encodedPoint = (unsigned char *)
1848                             OPENSSL_malloc(encodedlen*sizeof(unsigned char));
1849                         bn_ctx = BN_CTX_new();
1850                         if ((encodedPoint == NULL) || (bn_ctx == NULL))
1851                                 {
1852                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1853                                 goto err;
1854                                 }
1855
1856
1857                         encodedlen = EC_POINT_point2oct(group,
1858                             EC_KEY_get0_public_key(ecdh),
1859                             POINT_CONVERSION_UNCOMPRESSED,
1860                             encodedPoint, encodedlen, bn_ctx);
1861
1862                         if (encodedlen == 0)
1863                                 {
1864                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1865                                 goto err;
1866                                 }
1867
1868                         BN_CTX_free(bn_ctx);  bn_ctx=NULL;
1869
1870                         /* XXX: For now, we only support named (not
1871                          * generic) curves in ECDH ephemeral key exchanges.
1872                          * In this situation, we need four additional bytes
1873                          * to encode the entire ServerECDHParams
1874                          * structure.
1875                          */
1876                         n = 4 + encodedlen;
1877
1878                         /* We'll generate the serverKeyExchange message
1879                          * explicitly so we can set these to NULLs
1880                          */
1881                         r[0]=NULL;
1882                         r[1]=NULL;
1883                         r[2]=NULL;
1884                         r[3]=NULL;
1885                         }
1886                 else
1887 #endif /* !OPENSSL_NO_ECDH */
1888 #ifndef OPENSSL_NO_PSK
1889                         if (type & SSL_kPSK)
1890                                 {
1891                                 /* reserve size for record length and PSK identity hint*/
1892                                 n+=2+strlen(s->ctx->psk_identity_hint);
1893                                 }
1894                         else
1895 #endif /* !OPENSSL_NO_PSK */
1896 #ifndef OPENSSL_NO_SRP
1897                 if (type & SSL_kSRP)
1898                         {
1899                         if ((s->srp_ctx.N == NULL) ||
1900                                 (s->srp_ctx.g == NULL) ||
1901                                 (s->srp_ctx.s == NULL) ||
1902                                 (s->srp_ctx.B == NULL))
1903                                 {
1904                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_SRP_PARAM);
1905                                 goto err;
1906                                 }
1907                         r[0]=s->srp_ctx.N;
1908                         r[1]=s->srp_ctx.g;
1909                         r[2]=s->srp_ctx.s;
1910                         r[3]=s->srp_ctx.B;
1911                         }
1912                 else
1913 #endif
1914                         {
1915                         al=SSL_AD_HANDSHAKE_FAILURE;
1916                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1917                         goto f_err;
1918                         }
1919                 for (i=0; i < 4 && r[i] != NULL; i++)
1920                         {
1921                         nr[i]=BN_num_bytes(r[i]);
1922 #ifndef OPENSSL_NO_SRP
1923                         if ((i == 2) && (type & SSL_kSRP))
1924                                 n+=1+nr[i];
1925                         else
1926 #endif
1927                         n+=2+nr[i];
1928                         }
1929
1930                 if (!(s->s3->tmp.new_cipher->algorithm_auth & (SSL_aNULL|SSL_aSRP))
1931                         && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
1932                         {
1933                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher,&md))
1934                                 == NULL)
1935                                 {
1936                                 al=SSL_AD_DECODE_ERROR;
1937                                 goto f_err;
1938                                 }
1939                         kn=EVP_PKEY_size(pkey);
1940                         }
1941                 else
1942                         {
1943                         pkey=NULL;
1944                         kn=0;
1945                         }
1946
1947                 if (!BUF_MEM_grow_clean(buf,n+SSL_HM_HEADER_LENGTH(s)+kn))
1948                         {
1949                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1950                         goto err;
1951                         }
1952                 d = p = ssl_handshake_start(s);
1953
1954                 for (i=0; i < 4 && r[i] != NULL; i++)
1955                         {
1956 #ifndef OPENSSL_NO_SRP
1957                         if ((i == 2) && (type & SSL_kSRP))
1958                                 {
1959                                 *p = nr[i];
1960                                 p++;
1961                                 }
1962                         else
1963 #endif
1964                         s2n(nr[i],p);
1965                         BN_bn2bin(r[i],p);
1966                         p+=nr[i];
1967                         }
1968
1969 #ifndef OPENSSL_NO_ECDH
1970                 if (type & SSL_kEECDH)
1971                         {
1972                         /* XXX: For now, we only support named (not generic) curves.
1973                          * In this situation, the serverKeyExchange message has:
1974                          * [1 byte CurveType], [2 byte CurveName]
1975                          * [1 byte length of encoded point], followed by
1976                          * the actual encoded point itself
1977                          */
1978                         *p = NAMED_CURVE_TYPE;
1979                         p += 1;
1980                         *p = 0;
1981                         p += 1;
1982                         *p = curve_id;
1983                         p += 1;
1984                         *p = encodedlen;
1985                         p += 1;
1986                         memcpy((unsigned char*)p,
1987                             (unsigned char *)encodedPoint,
1988                             encodedlen);
1989                         OPENSSL_free(encodedPoint);
1990                         encodedPoint = NULL;
1991                         p += encodedlen;
1992                         }
1993 #endif
1994
1995 #ifndef OPENSSL_NO_PSK
1996                 if (type & SSL_kPSK)
1997                         {
1998                         /* copy PSK identity hint */
1999                         s2n(strlen(s->ctx->psk_identity_hint), p);
2000                         strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
2001                         p+=strlen(s->ctx->psk_identity_hint);
2002                         }
2003 #endif
2004
2005                 /* not anonymous */
2006                 if (pkey != NULL)
2007                         {
2008                         /* n is the length of the params, they start at &(d[4])
2009                          * and p points to the space at the end. */
2010 #ifndef OPENSSL_NO_RSA
2011                         if (pkey->type == EVP_PKEY_RSA && !SSL_USE_SIGALGS(s))
2012                                 {
2013                                 q=md_buf;
2014                                 j=0;
2015                                 for (num=2; num > 0; num--)
2016                                         {
2017                                         EVP_MD_CTX_set_flags(&md_ctx,
2018                                                 EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
2019                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
2020                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
2021                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
2022                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
2023                                         EVP_DigestUpdate(&md_ctx,d,n);
2024                                         EVP_DigestFinal_ex(&md_ctx,q,
2025                                                 (unsigned int *)&i);
2026                                         q+=i;
2027                                         j+=i;
2028                                         }
2029                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
2030                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
2031                                         {
2032                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
2033                                         goto err;
2034                                         }
2035                                 s2n(u,p);
2036                                 n+=u+2;
2037                                 }
2038                         else
2039 #endif
2040                         if (md)
2041                                 {
2042                                 /* send signature algorithm */
2043                                 if (SSL_USE_SIGALGS(s))
2044                                         {
2045                                         if (!tls12_get_sigandhash(p, pkey, md))
2046                                                 {
2047                                                 /* Should never happen */
2048                                                 al=SSL_AD_INTERNAL_ERROR;
2049                                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2050                                                 goto f_err;
2051                                                 }
2052                                         p+=2;
2053                                         }
2054 #ifdef SSL_DEBUG
2055                                 fprintf(stderr, "Using hash %s\n",
2056                                                         EVP_MD_name(md));
2057 #endif
2058                                 EVP_SignInit_ex(&md_ctx, md, NULL);
2059                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
2060                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
2061                                 EVP_SignUpdate(&md_ctx,d,n);
2062                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
2063                                         (unsigned int *)&i,pkey))
2064                                         {
2065                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_EVP);
2066                                         goto err;
2067                                         }
2068                                 s2n(i,p);
2069                                 n+=i+2;
2070                                 if (SSL_USE_SIGALGS(s))
2071                                         n+= 2;
2072                                 }
2073                         else
2074                                 {
2075                                 /* Is this error check actually needed? */
2076                                 al=SSL_AD_HANDSHAKE_FAILURE;
2077                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
2078                                 goto f_err;
2079                                 }
2080                         }
2081
2082                 ssl_set_handshake_header(s, SSL3_MT_SERVER_KEY_EXCHANGE, n);
2083                 }
2084
2085         s->state = SSL3_ST_SW_KEY_EXCH_B;
2086         EVP_MD_CTX_cleanup(&md_ctx);
2087         return ssl_do_write(s);
2088 f_err:
2089         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2090 err:
2091 #ifndef OPENSSL_NO_ECDH
2092         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2093         BN_CTX_free(bn_ctx);
2094 #endif
2095         EVP_MD_CTX_cleanup(&md_ctx);
2096         return(-1);
2097         }
2098
2099 int ssl3_send_certificate_request(SSL *s)
2100         {
2101         unsigned char *p,*d;
2102         int i,j,nl,off,n;
2103         STACK_OF(X509_NAME) *sk=NULL;
2104         X509_NAME *name;
2105         BUF_MEM *buf;
2106
2107         if (s->state == SSL3_ST_SW_CERT_REQ_A)
2108                 {
2109                 buf=s->init_buf;
2110
2111                 d=p=ssl_handshake_start(s);
2112
2113                 /* get the list of acceptable cert types */
2114                 p++;
2115                 n=ssl3_get_req_cert_type(s,p);
2116                 d[0]=n;
2117                 p+=n;
2118                 n++;
2119
2120                 if (SSL_USE_SIGALGS(s))
2121                         {
2122                         const unsigned char *psigs;
2123                         nl = tls12_get_psigalgs(s, &psigs);
2124                         s2n(nl, p);
2125                         memcpy(p, psigs, nl);
2126                         p += nl;
2127                         n += nl + 2;
2128                         }
2129
2130                 off=n;
2131                 p+=2;
2132                 n+=2;
2133
2134                 sk=SSL_get_client_CA_list(s);
2135                 nl=0;
2136                 if (sk != NULL)
2137                         {
2138                         for (i=0; i<sk_X509_NAME_num(sk); i++)
2139                                 {
2140                                 name=sk_X509_NAME_value(sk,i);
2141                                 j=i2d_X509_NAME(name,NULL);
2142                                 if (!BUF_MEM_grow_clean(buf,SSL_HM_HEADER_LENGTH(s)+n+j+2))
2143                                         {
2144                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
2145                                         goto err;
2146                                         }
2147                                 p = ssl_handshake_start(s) + n;
2148                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
2149                                         {
2150                                         s2n(j,p);
2151                                         i2d_X509_NAME(name,&p);
2152                                         n+=2+j;
2153                                         nl+=2+j;
2154                                         }
2155                                 else
2156                                         {
2157                                         d=p;
2158                                         i2d_X509_NAME(name,&p);
2159                                         j-=2; s2n(j,d); j+=2;
2160                                         n+=j;
2161                                         nl+=j;
2162                                         }
2163                                 }
2164                         }
2165                 /* else no CA names */
2166                 p = ssl_handshake_start(s) + off;
2167                 s2n(nl,p);
2168
2169                 ssl_set_handshake_header(s, SSL3_MT_CERTIFICATE_REQUEST, n);
2170
2171 #ifdef NETSCAPE_HANG_BUG
2172                 if (!SSL_IS_DTLS(s))
2173                         {
2174                         if (!BUF_MEM_grow_clean(buf, s->init_num + 4))
2175                                 {
2176                                 SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
2177                                 goto err;
2178                                 }
2179                         p=(unsigned char *)s->init_buf->data + s->init_num;
2180                         /* do the header */
2181                         *(p++)=SSL3_MT_SERVER_DONE;
2182                         *(p++)=0;
2183                         *(p++)=0;
2184                         *(p++)=0;
2185                         s->init_num += 4;
2186                         }
2187 #endif
2188
2189                 s->state = SSL3_ST_SW_CERT_REQ_B;
2190                 }
2191
2192         /* SSL3_ST_SW_CERT_REQ_B */
2193         return ssl_do_write(s);
2194 err:
2195         return(-1);
2196         }
2197
2198 int ssl3_get_client_key_exchange(SSL *s)
2199         {
2200         int i,al,ok;
2201         long n;
2202         unsigned long alg_k;
2203         unsigned char *p;
2204 #ifndef OPENSSL_NO_RSA
2205         RSA *rsa=NULL;
2206         EVP_PKEY *pkey=NULL;
2207 #endif
2208 #ifndef OPENSSL_NO_DH
2209         BIGNUM *pub=NULL;
2210         DH *dh_srvr, *dh_clnt = NULL;
2211 #endif
2212 #ifndef OPENSSL_NO_KRB5
2213         KSSL_ERR kssl_err;
2214 #endif /* OPENSSL_NO_KRB5 */
2215
2216 #ifndef OPENSSL_NO_ECDH
2217         EC_KEY *srvr_ecdh = NULL;
2218         EVP_PKEY *clnt_pub_pkey = NULL;
2219         EC_POINT *clnt_ecpoint = NULL;
2220         BN_CTX *bn_ctx = NULL;
2221 #endif
2222
2223         n=s->method->ssl_get_message(s,
2224                 SSL3_ST_SR_KEY_EXCH_A,
2225                 SSL3_ST_SR_KEY_EXCH_B,
2226                 SSL3_MT_CLIENT_KEY_EXCHANGE,
2227                 2048, /* ??? */
2228                 &ok);
2229
2230         if (!ok) return((int)n);
2231         p=(unsigned char *)s->init_msg;
2232
2233         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2234
2235 #ifndef OPENSSL_NO_RSA
2236         if (alg_k & SSL_kRSA)
2237                 {
2238                 unsigned char rand_premaster_secret[SSL_MAX_MASTER_KEY_LENGTH];
2239                 int decrypt_len;
2240                 unsigned char decrypt_good, version_good;
2241                 size_t j;
2242
2243                 /* FIX THIS UP EAY EAY EAY EAY */
2244                 if (s->s3->tmp.use_rsa_tmp)
2245                         {
2246                         if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
2247                                 rsa=s->cert->rsa_tmp;
2248                         /* Don't do a callback because rsa_tmp should
2249                          * be sent already */
2250                         if (rsa == NULL)
2251                                 {
2252                                 al=SSL_AD_HANDSHAKE_FAILURE;
2253                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
2254                                 goto f_err;
2255
2256                                 }
2257                         }
2258                 else
2259                         {
2260                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
2261                         if (    (pkey == NULL) ||
2262                                 (pkey->type != EVP_PKEY_RSA) ||
2263                                 (pkey->pkey.rsa == NULL))
2264                                 {
2265                                 al=SSL_AD_HANDSHAKE_FAILURE;
2266                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
2267                                 goto f_err;
2268                                 }
2269                         rsa=pkey->pkey.rsa;
2270                         }
2271
2272                 /* TLS and [incidentally] DTLS{0xFEFF} */
2273                 if (s->version > SSL3_VERSION && s->version != DTLS1_BAD_VER)
2274                         {
2275                         n2s(p,i);
2276                         if (n != i+2)
2277                                 {
2278                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
2279                                         {
2280                                         al = SSL_AD_DECODE_ERROR;
2281                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
2282                                         goto f_err;
2283                                         }
2284                                 else
2285                                         p-=2;
2286                                 }
2287                         else
2288                                 n=i;
2289                         }
2290
2291                 /*
2292                  * Reject overly short RSA ciphertext because we want to be sure
2293                  * that the buffer size makes it safe to iterate over the entire
2294                  * size of a premaster secret (SSL_MAX_MASTER_KEY_LENGTH). The
2295                  * actual expected size is larger due to RSA padding, but the
2296                  * bound is sufficient to be safe.
2297                  */
2298                 if (n < SSL_MAX_MASTER_KEY_LENGTH)
2299                         {
2300                         al = SSL_AD_DECRYPT_ERROR;
2301                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
2302                         goto f_err;
2303                         }
2304
2305                 /* We must not leak whether a decryption failure occurs because
2306                  * of Bleichenbacher's attack on PKCS #1 v1.5 RSA padding (see
2307                  * RFC 2246, section 7.4.7.1). The code follows that advice of
2308                  * the TLS RFC and generates a random premaster secret for the
2309                  * case that the decrypt fails. See
2310                  * https://tools.ietf.org/html/rfc5246#section-7.4.7.1 */
2311
2312                 /* should be RAND_bytes, but we cannot work around a failure. */
2313                 if (RAND_pseudo_bytes(rand_premaster_secret,
2314                                       sizeof(rand_premaster_secret)) <= 0)
2315                         goto err;
2316                 decrypt_len = RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
2317                 ERR_clear_error();
2318
2319                 /* decrypt_len should be SSL_MAX_MASTER_KEY_LENGTH.
2320                  * decrypt_good will be 0xff if so and zero otherwise. */
2321                 decrypt_good = constant_time_eq_int_8(decrypt_len, SSL_MAX_MASTER_KEY_LENGTH);
2322
2323                 /* If the version in the decrypted pre-master secret is correct
2324                  * then version_good will be 0xff, otherwise it'll be zero.
2325                  * The Klima-Pokorny-Rosa extension of Bleichenbacher's attack
2326                  * (http://eprint.iacr.org/2003/052/) exploits the version
2327                  * number check as a "bad version oracle". Thus version checks
2328                  * are done in constant time and are treated like any other
2329                  * decryption error. */
2330                 version_good = constant_time_eq_8(p[0], (unsigned)(s->client_version>>8));
2331                 version_good &= constant_time_eq_8(p[1], (unsigned)(s->client_version&0xff));
2332
2333                 /* The premaster secret must contain the same version number as
2334                  * the ClientHello to detect version rollback attacks
2335                  * (strangely, the protocol does not offer such protection for
2336                  * DH ciphersuites). However, buggy clients exist that send the
2337                  * negotiated protocol version instead if the server does not
2338                  * support the requested protocol version. If
2339                  * SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
2340                 if (s->options & SSL_OP_TLS_ROLLBACK_BUG)
2341                         {
2342                         unsigned char workaround_good;
2343                         workaround_good = constant_time_eq_8(p[0], (unsigned)(s->version>>8));
2344                         workaround_good &= constant_time_eq_8(p[1], (unsigned)(s->version&0xff));
2345                         version_good |= workaround_good;
2346                         }
2347
2348                 /* Both decryption and version must be good for decrypt_good
2349                  * to remain non-zero (0xff). */
2350                 decrypt_good &= version_good;
2351
2352                 /*
2353                  * Now copy rand_premaster_secret over from p using
2354                  * decrypt_good_mask. If decryption failed, then p does not
2355                  * contain valid plaintext, however, a check above guarantees
2356                  * it is still sufficiently large to read from.
2357                  */
2358                 for (j = 0; j < sizeof(rand_premaster_secret); j++)
2359                         {
2360                         p[j] = constant_time_select_8(decrypt_good, p[j],
2361                                                       rand_premaster_secret[j]);
2362                         }
2363
2364                 s->session->master_key_length=
2365                         s->method->ssl3_enc->generate_master_secret(s,
2366                                 s->session->master_key,
2367                                 p,sizeof(rand_premaster_secret));
2368                 OPENSSL_cleanse(p,sizeof(rand_premaster_secret));
2369                 }
2370         else
2371 #endif
2372 #ifndef OPENSSL_NO_DH
2373                 if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2374                 {
2375                 int idx = -1;
2376                 EVP_PKEY *skey = NULL;
2377                 if (n)
2378                         n2s(p,i);
2379                 else
2380                         i = 0;
2381                 if (n && n != i+2)
2382                         {
2383                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
2384                                 {
2385                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
2386                                 goto err;
2387                                 }
2388                         else
2389                                 {
2390                                 p-=2;
2391                                 i=(int)n;
2392                                 }
2393                         }
2394                 if (alg_k & SSL_kDHr)
2395                         idx = SSL_PKEY_DH_RSA;
2396                 else if (alg_k & SSL_kDHd)
2397                         idx = SSL_PKEY_DH_DSA;
2398                 if (idx >= 0)
2399                         {
2400                         skey = s->cert->pkeys[idx].privatekey;
2401                         if ((skey == NULL) ||
2402                                 (skey->type != EVP_PKEY_DH) ||
2403                                 (skey->pkey.dh == NULL))
2404                                 {
2405                                 al=SSL_AD_HANDSHAKE_FAILURE;
2406                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
2407                                 goto f_err;
2408                                 }
2409                         dh_srvr = skey->pkey.dh;
2410                         }
2411                 else if (s->s3->tmp.dh == NULL)
2412                         {
2413                         al=SSL_AD_HANDSHAKE_FAILURE;
2414                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
2415                         goto f_err;
2416                         }
2417                 else
2418                         dh_srvr=s->s3->tmp.dh;
2419
2420                 if (n == 0L)
2421                         {
2422                         /* Get pubkey from cert */
2423                         EVP_PKEY *clkey=X509_get_pubkey(s->session->peer);
2424                         if (clkey)
2425                                 {
2426                                 if (EVP_PKEY_cmp_parameters(clkey, skey) == 1)
2427                                         dh_clnt = EVP_PKEY_get1_DH(clkey);
2428                                 }
2429                         if (dh_clnt == NULL)
2430                                 {
2431                                 al=SSL_AD_HANDSHAKE_FAILURE;
2432                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
2433                                 goto f_err;
2434                                 }
2435                         EVP_PKEY_free(clkey);
2436                         pub = dh_clnt->pub_key;
2437                         }
2438                 else
2439                         pub=BN_bin2bn(p,i,NULL);
2440                 if (pub == NULL)
2441                         {
2442                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
2443                         goto err;
2444                         }
2445
2446                 i=DH_compute_key(p,pub,dh_srvr);
2447
2448                 if (i <= 0)
2449                         {
2450                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2451                         BN_clear_free(pub);
2452                         goto err;
2453                         }
2454
2455                 DH_free(s->s3->tmp.dh);
2456                 s->s3->tmp.dh=NULL;
2457                 if (dh_clnt)
2458                         DH_free(dh_clnt);
2459                 else
2460                         BN_clear_free(pub);
2461                 pub=NULL;
2462                 s->session->master_key_length=
2463                         s->method->ssl3_enc->generate_master_secret(s,
2464                                 s->session->master_key,p,i);
2465                 OPENSSL_cleanse(p,i);
2466                 if (dh_clnt)
2467                         return 2;
2468                 }
2469         else
2470 #endif
2471 #ifndef OPENSSL_NO_KRB5
2472         if (alg_k & SSL_kKRB5)
2473                 {
2474                 krb5_error_code         krb5rc;
2475                 krb5_data               enc_ticket;
2476                 krb5_data               authenticator;
2477                 krb5_data               enc_pms;
2478                 KSSL_CTX                *kssl_ctx = s->kssl_ctx;
2479                 EVP_CIPHER_CTX          ciph_ctx;
2480                 const EVP_CIPHER        *enc = NULL;
2481                 unsigned char           iv[EVP_MAX_IV_LENGTH];
2482                 unsigned char           pms[SSL_MAX_MASTER_KEY_LENGTH
2483                                                + EVP_MAX_BLOCK_LENGTH];
2484                 int                  padl, outl;
2485                 krb5_timestamp          authtime = 0;
2486                 krb5_ticket_times       ttimes;
2487
2488                 EVP_CIPHER_CTX_init(&ciph_ctx);
2489
2490                 if (!kssl_ctx)  kssl_ctx = kssl_ctx_new();
2491
2492                 n2s(p,i);
2493                 enc_ticket.length = i;
2494
2495                 if (n < (long)(enc_ticket.length + 6))
2496                         {
2497                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2498                                 SSL_R_DATA_LENGTH_TOO_LONG);
2499                         goto err;
2500                         }
2501
2502                 enc_ticket.data = (char *)p;
2503                 p+=enc_ticket.length;
2504
2505                 n2s(p,i);
2506                 authenticator.length = i;
2507
2508                 if (n < (long)(enc_ticket.length + authenticator.length + 6))
2509                         {
2510                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2511                                 SSL_R_DATA_LENGTH_TOO_LONG);
2512                         goto err;
2513                         }
2514
2515                 authenticator.data = (char *)p;
2516                 p+=authenticator.length;
2517
2518                 n2s(p,i);
2519                 enc_pms.length = i;
2520                 enc_pms.data = (char *)p;
2521                 p+=enc_pms.length;
2522
2523                 /* Note that the length is checked again below,
2524                 ** after decryption
2525                 */
2526                 if(enc_pms.length > sizeof pms)
2527                         {
2528                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2529                                SSL_R_DATA_LENGTH_TOO_LONG);
2530                         goto err;
2531                         }
2532
2533                 if (n != (long)(enc_ticket.length + authenticator.length +
2534                                                 enc_pms.length + 6))
2535                         {
2536                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2537                                 SSL_R_DATA_LENGTH_TOO_LONG);
2538                         goto err;
2539                         }
2540
2541                 if ((krb5rc = kssl_sget_tkt(kssl_ctx, &enc_ticket, &ttimes,
2542                                         &kssl_err)) != 0)
2543                         {
2544 #ifdef KSSL_DEBUG
2545                         printf("kssl_sget_tkt rtn %d [%d]\n",
2546                                 krb5rc, kssl_err.reason);
2547                         if (kssl_err.text)
2548                                 printf("kssl_err text= %s\n", kssl_err.text);
2549 #endif  /* KSSL_DEBUG */
2550                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2551                                 kssl_err.reason);
2552                         goto err;
2553                         }
2554
2555                 /*  Note: no authenticator is not considered an error,
2556                 **  but will return authtime == 0.
2557                 */
2558                 if ((krb5rc = kssl_check_authent(kssl_ctx, &authenticator,
2559                                         &authtime, &kssl_err)) != 0)
2560                         {
2561 #ifdef KSSL_DEBUG
2562                         printf("kssl_check_authent rtn %d [%d]\n",
2563                                 krb5rc, kssl_err.reason);
2564                         if (kssl_err.text)
2565                                 printf("kssl_err text= %s\n", kssl_err.text);
2566 #endif  /* KSSL_DEBUG */
2567                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2568                                 kssl_err.reason);
2569                         goto err;
2570                         }
2571
2572                 if ((krb5rc = kssl_validate_times(authtime, &ttimes)) != 0)
2573                         {
2574                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, krb5rc);
2575                         goto err;
2576                         }
2577
2578 #ifdef KSSL_DEBUG
2579                 kssl_ctx_show(kssl_ctx);
2580 #endif  /* KSSL_DEBUG */
2581
2582                 enc = kssl_map_enc(kssl_ctx->enctype);
2583                 if (enc == NULL)
2584                     goto err;
2585
2586                 memset(iv, 0, sizeof iv);       /* per RFC 1510 */
2587
2588                 if (!EVP_DecryptInit_ex(&ciph_ctx,enc,NULL,kssl_ctx->key,iv))
2589                         {
2590                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2591                                 SSL_R_DECRYPTION_FAILED);
2592                         goto err;
2593                         }
2594                 if (!EVP_DecryptUpdate(&ciph_ctx, pms,&outl,
2595                                         (unsigned char *)enc_pms.data, enc_pms.length))
2596                         {
2597                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2598                                 SSL_R_DECRYPTION_FAILED);
2599                         goto err;
2600                         }
2601                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2602                         {
2603                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2604                                 SSL_R_DATA_LENGTH_TOO_LONG);
2605                         goto err;
2606                         }
2607                 if (!EVP_DecryptFinal_ex(&ciph_ctx,&(pms[outl]),&padl))
2608                         {
2609                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2610                                 SSL_R_DECRYPTION_FAILED);
2611                         goto err;
2612                         }
2613                 outl += padl;
2614                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2615                         {
2616                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2617                                 SSL_R_DATA_LENGTH_TOO_LONG);
2618                         goto err;
2619                         }
2620                 if (!((pms[0] == (s->client_version>>8)) && (pms[1] == (s->client_version & 0xff))))
2621                     {
2622                     /* The premaster secret must contain the same version number as the
2623                      * ClientHello to detect version rollback attacks (strangely, the
2624                      * protocol does not offer such protection for DH ciphersuites).
2625                      * However, buggy clients exist that send random bytes instead of
2626                      * the protocol version.
2627                      * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients.
2628                      * (Perhaps we should have a separate BUG value for the Kerberos cipher)
2629                      */
2630                     if (!(s->options & SSL_OP_TLS_ROLLBACK_BUG))
2631                         {
2632                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2633                                SSL_AD_DECODE_ERROR);
2634                         goto err;
2635                         }
2636                     }
2637
2638                 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2639
2640                 s->session->master_key_length=
2641                         s->method->ssl3_enc->generate_master_secret(s,
2642                                 s->session->master_key, pms, outl);
2643
2644                 if (kssl_ctx->client_princ)
2645                         {
2646                         size_t len = strlen(kssl_ctx->client_princ);
2647                         if ( len < SSL_MAX_KRB5_PRINCIPAL_LENGTH )
2648                                 {
2649                                 s->session->krb5_client_princ_len = len;
2650                                 memcpy(s->session->krb5_client_princ,kssl_ctx->client_princ,len);
2651                                 }
2652                         }
2653
2654
2655                 /*  Was doing kssl_ctx_free() here,
2656                 **  but it caused problems for apache.
2657                 **  kssl_ctx = kssl_ctx_free(kssl_ctx);
2658                 **  if (s->kssl_ctx)  s->kssl_ctx = NULL;
2659                 */
2660                 }
2661         else
2662 #endif  /* OPENSSL_NO_KRB5 */
2663
2664 #ifndef OPENSSL_NO_ECDH
2665                 if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2666                 {
2667                 int ret = 1;
2668                 int field_size = 0;
2669                 const EC_KEY   *tkey;
2670                 const EC_GROUP *group;
2671                 const BIGNUM *priv_key;
2672
2673                 /* initialize structures for server's ECDH key pair */
2674                 if ((srvr_ecdh = EC_KEY_new()) == NULL)
2675                         {
2676                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2677                             ERR_R_MALLOC_FAILURE);
2678                         goto err;
2679                         }
2680
2681                 /* Let's get server private key and group information */
2682                 if (alg_k & (SSL_kECDHr|SSL_kECDHe))
2683                         {
2684                         /* use the certificate */
2685                         tkey = s->cert->pkeys[SSL_PKEY_ECC].privatekey->pkey.ec;
2686                         }
2687                 else
2688                         {
2689                         /* use the ephermeral values we saved when
2690                          * generating the ServerKeyExchange msg.
2691                          */
2692                         tkey = s->s3->tmp.ecdh;
2693                         }
2694
2695                 group    = EC_KEY_get0_group(tkey);
2696                 priv_key = EC_KEY_get0_private_key(tkey);
2697
2698                 if (!EC_KEY_set_group(srvr_ecdh, group) ||
2699                     !EC_KEY_set_private_key(srvr_ecdh, priv_key))
2700                         {
2701                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2702                                ERR_R_EC_LIB);
2703                         goto err;
2704                         }
2705
2706                 /* Let's get client's public key */
2707                 if ((clnt_ecpoint = EC_POINT_new(group)) == NULL)
2708                         {
2709                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2710                             ERR_R_MALLOC_FAILURE);
2711                         goto err;
2712                         }
2713
2714                 if (n == 0L)
2715                         {
2716                         /* Client Publickey was in Client Certificate */
2717
2718                          if (alg_k & SSL_kEECDH)
2719                                  {
2720                                  al=SSL_AD_HANDSHAKE_FAILURE;
2721                                  SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
2722                                  goto f_err;
2723                                  }
2724                         if (((clnt_pub_pkey=X509_get_pubkey(s->session->peer))
2725                             == NULL) ||
2726                             (clnt_pub_pkey->type != EVP_PKEY_EC))
2727                                 {
2728                                 /* XXX: For now, we do not support client
2729                                  * authentication using ECDH certificates
2730                                  * so this branch (n == 0L) of the code is
2731                                  * never executed. When that support is
2732                                  * added, we ought to ensure the key
2733                                  * received in the certificate is
2734                                  * authorized for key agreement.
2735                                  * ECDH_compute_key implicitly checks that
2736                                  * the two ECDH shares are for the same
2737                                  * group.
2738                                  */
2739                                 al=SSL_AD_HANDSHAKE_FAILURE;
2740                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2741                                     SSL_R_UNABLE_TO_DECODE_ECDH_CERTS);
2742                                 goto f_err;
2743                                 }
2744
2745                         if (EC_POINT_copy(clnt_ecpoint,
2746                             EC_KEY_get0_public_key(clnt_pub_pkey->pkey.ec)) == 0)
2747                                 {
2748                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2749                                         ERR_R_EC_LIB);
2750                                 goto err;
2751                                 }
2752                         ret = 2; /* Skip certificate verify processing */
2753                         }
2754                 else
2755                         {
2756                         /* Get client's public key from encoded point
2757                          * in the ClientKeyExchange message.
2758                          */
2759                         if ((bn_ctx = BN_CTX_new()) == NULL)
2760                                 {
2761                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2762                                     ERR_R_MALLOC_FAILURE);
2763                                 goto err;
2764                                 }
2765
2766                         /* Get encoded point length */
2767                         i = *p;
2768                         p += 1;
2769                         if (n != 1 + i)
2770                                 {
2771                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2772                                     ERR_R_EC_LIB);
2773                                 goto err;
2774                                 }
2775                         if (EC_POINT_oct2point(group,
2776                             clnt_ecpoint, p, i, bn_ctx) == 0)
2777                                 {
2778                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2779                                     ERR_R_EC_LIB);
2780                                 goto err;
2781                                 }
2782                         /* p is pointing to somewhere in the buffer
2783                          * currently, so set it to the start
2784                          */
2785                         p=(unsigned char *)s->init_buf->data;
2786                         }
2787
2788                 /* Compute the shared pre-master secret */
2789                 field_size = EC_GROUP_get_degree(group);
2790                 if (field_size <= 0)
2791                         {
2792                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2793                                ERR_R_ECDH_LIB);
2794                         goto err;
2795                         }
2796                 i = ECDH_compute_key(p, (field_size+7)/8, clnt_ecpoint, srvr_ecdh, NULL);
2797                 if (i <= 0)
2798                         {
2799                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2800                             ERR_R_ECDH_LIB);
2801                         goto err;
2802                         }
2803
2804                 EVP_PKEY_free(clnt_pub_pkey);
2805                 EC_POINT_free(clnt_ecpoint);
2806                 EC_KEY_free(srvr_ecdh);
2807                 BN_CTX_free(bn_ctx);
2808                 EC_KEY_free(s->s3->tmp.ecdh);
2809                 s->s3->tmp.ecdh = NULL;
2810
2811                 /* Compute the master secret */
2812                 s->session->master_key_length = s->method->ssl3_enc-> \
2813                     generate_master_secret(s, s->session->master_key, p, i);
2814
2815                 OPENSSL_cleanse(p, i);
2816                 return (ret);
2817                 }
2818         else
2819 #endif
2820 #ifndef OPENSSL_NO_PSK
2821                 if (alg_k & SSL_kPSK)
2822                         {
2823                         unsigned char *t = NULL;
2824                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
2825                         unsigned int pre_ms_len = 0, psk_len = 0;
2826                         int psk_err = 1;
2827                         char tmp_id[PSK_MAX_IDENTITY_LEN+1];
2828
2829                         al=SSL_AD_HANDSHAKE_FAILURE;
2830
2831                         n2s(p,i);
2832                         if (n != i+2)
2833                                 {
2834                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2835                                         SSL_R_LENGTH_MISMATCH);
2836                                 goto psk_err;
2837                                 }
2838                         if (i > PSK_MAX_IDENTITY_LEN)
2839                                 {
2840                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2841                                         SSL_R_DATA_LENGTH_TOO_LONG);
2842                                 goto psk_err;
2843                                 }
2844                         if (s->psk_server_callback == NULL)
2845                                 {
2846                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2847                                        SSL_R_PSK_NO_SERVER_CB);
2848                                 goto psk_err;
2849                                 }
2850
2851                         /* Create guaranteed NULL-terminated identity
2852                          * string for the callback */
2853                         memcpy(tmp_id, p, i);
2854                         memset(tmp_id+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
2855                         psk_len = s->psk_server_callback(s, tmp_id,
2856                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
2857                         OPENSSL_cleanse(tmp_id, PSK_MAX_IDENTITY_LEN+1);
2858
2859                         if (psk_len > PSK_MAX_PSK_LEN)
2860                                 {
2861                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2862                                         ERR_R_INTERNAL_ERROR);
2863                                 goto psk_err;
2864                                 }
2865                         else if (psk_len == 0)
2866                                 {
2867                                 /* PSK related to the given identity not found */
2868                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2869                                        SSL_R_PSK_IDENTITY_NOT_FOUND);
2870                                 al=SSL_AD_UNKNOWN_PSK_IDENTITY;
2871                                 goto psk_err;
2872                                 }
2873
2874                         /* create PSK pre_master_secret */
2875                         pre_ms_len=2+psk_len+2+psk_len;
2876                         t = psk_or_pre_ms;
2877                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
2878                         s2n(psk_len, t);
2879                         memset(t, 0, psk_len);
2880                         t+=psk_len;
2881                         s2n(psk_len, t);
2882
2883                         if (s->session->psk_identity != NULL)
2884                                 OPENSSL_free(s->session->psk_identity);
2885                         s->session->psk_identity = BUF_strdup((char *)p);
2886                         if (s->session->psk_identity == NULL)
2887                                 {
2888                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2889                                         ERR_R_MALLOC_FAILURE);
2890                                 goto psk_err;
2891                                 }
2892
2893                         if (s->session->psk_identity_hint != NULL)
2894                                 OPENSSL_free(s->session->psk_identity_hint);
2895                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
2896                         if (s->ctx->psk_identity_hint != NULL &&
2897                                 s->session->psk_identity_hint == NULL)
2898                                 {
2899                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2900                                         ERR_R_MALLOC_FAILURE);
2901                                 goto psk_err;
2902                                 }
2903
2904                         s->session->master_key_length=
2905                                 s->method->ssl3_enc->generate_master_secret(s,
2906                                         s->session->master_key, psk_or_pre_ms, pre_ms_len);
2907                         psk_err = 0;
2908                 psk_err:
2909                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
2910                         if (psk_err != 0)
2911                                 goto f_err;
2912                         }
2913                 else
2914 #endif
2915 #ifndef OPENSSL_NO_SRP
2916                 if (alg_k & SSL_kSRP)
2917                         {
2918                         int param_len;
2919
2920                         n2s(p,i);
2921                         param_len=i+2;
2922                         if (param_len > n)
2923                                 {
2924                                 al=SSL_AD_DECODE_ERROR;
2925                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_SRP_A_LENGTH);
2926                                 goto f_err;
2927                                 }
2928                         if (!(s->srp_ctx.A=BN_bin2bn(p,i,NULL)))
2929                                 {
2930                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_BN_LIB);
2931                                 goto err;
2932                                 }
2933                         if (BN_ucmp(s->srp_ctx.A, s->srp_ctx.N) >= 0
2934                                 || BN_is_zero(s->srp_ctx.A))
2935                                 {
2936                                 al=SSL_AD_ILLEGAL_PARAMETER;
2937                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_SRP_PARAMETERS);
2938                                 goto f_err;
2939                                 }
2940                         if (s->session->srp_username != NULL)
2941                                 OPENSSL_free(s->session->srp_username);
2942                         s->session->srp_username = BUF_strdup(s->srp_ctx.login);
2943                         if (s->session->srp_username == NULL)
2944                                 {
2945                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2946                                         ERR_R_MALLOC_FAILURE);
2947                                 goto err;
2948                                 }
2949
2950                         if ((s->session->master_key_length = SRP_generate_server_master_secret(s,s->session->master_key))<0)
2951                                 {
2952                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2953                                 goto err;
2954                                 }
2955
2956                         p+=i;
2957                         }
2958                 else
2959 #endif  /* OPENSSL_NO_SRP */
2960                 if (alg_k & SSL_kGOST)
2961                         {
2962                         int ret = 0;
2963                         EVP_PKEY_CTX *pkey_ctx;
2964                         EVP_PKEY *client_pub_pkey = NULL, *pk = NULL;
2965                         unsigned char premaster_secret[32], *start;
2966                         size_t outlen=32, inlen;
2967                         unsigned long alg_a;
2968                         int Ttag, Tclass;
2969                         long Tlen;
2970
2971                         /* Get our certificate private key*/
2972                         alg_a = s->s3->tmp.new_cipher->algorithm_auth;
2973                         if (alg_a & SSL_aGOST94)
2974                                 pk = s->cert->pkeys[SSL_PKEY_GOST94].privatekey;
2975                         else if (alg_a & SSL_aGOST01)
2976                                 pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey;
2977
2978                         pkey_ctx = EVP_PKEY_CTX_new(pk,NULL);
2979                         EVP_PKEY_decrypt_init(pkey_ctx);
2980                         /* If client certificate is present and is of the same type, maybe
2981                          * use it for key exchange.  Don't mind errors from
2982                          * EVP_PKEY_derive_set_peer, because it is completely valid to use
2983                          * a client certificate for authorization only. */
2984                         client_pub_pkey = X509_get_pubkey(s->session->peer);
2985                         if (client_pub_pkey)
2986                                 {
2987                                 if (EVP_PKEY_derive_set_peer(pkey_ctx, client_pub_pkey) <= 0)
2988                                         ERR_clear_error();
2989                                 }
2990                         /* Decrypt session key */
2991                         if (ASN1_get_object((const unsigned char **)&p, &Tlen, &Ttag, &Tclass, n) != V_ASN1_CONSTRUCTED ||
2992                                 Ttag != V_ASN1_SEQUENCE ||
2993                                 Tclass != V_ASN1_UNIVERSAL)
2994                                 {
2995                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2996                                 goto gerr;
2997                                 }
2998                         start = p;
2999                         inlen = Tlen;
3000                         if (EVP_PKEY_decrypt(pkey_ctx,premaster_secret,&outlen,start,inlen) <=0)
3001
3002                                 {
3003                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
3004                                 goto gerr;
3005                                 }
3006                         /* Generate master secret */
3007                         s->session->master_key_length=
3008                                 s->method->ssl3_enc->generate_master_secret(s,
3009                                         s->session->master_key,premaster_secret,32);
3010                         /* Check if pubkey from client certificate was used */
3011                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
3012                                 ret = 2;
3013                         else
3014                                 ret = 1;
3015                 gerr:
3016                         EVP_PKEY_free(client_pub_pkey);
3017                         EVP_PKEY_CTX_free(pkey_ctx);
3018                         if (ret)
3019                                 return ret;
3020                         else
3021                                 goto err;
3022                         }
3023                 else
3024                 {
3025                 al=SSL_AD_HANDSHAKE_FAILURE;
3026                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
3027                                 SSL_R_UNKNOWN_CIPHER_TYPE);
3028                 goto f_err;
3029                 }
3030
3031         return(1);
3032 f_err:
3033         ssl3_send_alert(s,SSL3_AL_FATAL,al);
3034 #if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA) || !defined(OPENSSL_NO_ECDH) || defined(OPENSSL_NO_SRP)
3035 err:
3036 #endif
3037 #ifndef OPENSSL_NO_ECDH
3038         EVP_PKEY_free(clnt_pub_pkey);
3039         EC_POINT_free(clnt_ecpoint);
3040         if (srvr_ecdh != NULL)
3041                 EC_KEY_free(srvr_ecdh);
3042         BN_CTX_free(bn_ctx);
3043 #endif
3044         return(-1);
3045         }
3046
3047 int ssl3_get_cert_verify(SSL *s)
3048         {
3049         EVP_PKEY *pkey=NULL;
3050         unsigned char *p;
3051         int al,ok,ret=0;
3052         long n;
3053         int type=0,i,j;
3054         X509 *peer;
3055         const EVP_MD *md = NULL;
3056         EVP_MD_CTX mctx;
3057         EVP_MD_CTX_init(&mctx);
3058
3059         n=s->method->ssl_get_message(s,
3060                 SSL3_ST_SR_CERT_VRFY_A,
3061                 SSL3_ST_SR_CERT_VRFY_B,
3062                 -1,
3063                 SSL3_RT_MAX_PLAIN_LENGTH,
3064                 &ok);
3065
3066         if (!ok) return((int)n);
3067
3068         if (s->session->peer != NULL)
3069                 {
3070                 peer=s->session->peer;
3071                 pkey=X509_get_pubkey(peer);
3072                 type=X509_certificate_type(peer,pkey);
3073                 }
3074         else
3075                 {
3076                 peer=NULL;
3077                 pkey=NULL;
3078                 }
3079
3080         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
3081                 {
3082                 s->s3->tmp.reuse_message=1;
3083                 if ((peer != NULL) && (type & EVP_PKT_SIGN))
3084                         {
3085                         al=SSL_AD_UNEXPECTED_MESSAGE;
3086                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
3087                         goto f_err;
3088                         }
3089                 ret=1;
3090                 goto end;
3091                 }
3092
3093         if (peer == NULL)
3094                 {
3095                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
3096                 al=SSL_AD_UNEXPECTED_MESSAGE;
3097                 goto f_err;
3098                 }
3099
3100         if (!(type & EVP_PKT_SIGN))
3101                 {
3102                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
3103                 al=SSL_AD_ILLEGAL_PARAMETER;
3104                 goto f_err;
3105                 }
3106
3107         if (s->s3->change_cipher_spec)
3108                 {
3109                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
3110                 al=SSL_AD_UNEXPECTED_MESSAGE;
3111                 goto f_err;
3112                 }
3113
3114         /* we now have a signature that we need to verify */
3115         p=(unsigned char *)s->init_msg;
3116         /* Check for broken implementations of GOST ciphersuites */
3117         /* If key is GOST and n is exactly 64, it is bare
3118          * signature without length field */
3119         if (n==64 && (pkey->type==NID_id_GostR3410_94 ||
3120                 pkey->type == NID_id_GostR3410_2001) )
3121                 {
3122                 i=64;
3123                 }
3124         else
3125                 {
3126                 if (SSL_USE_SIGALGS(s))
3127                         {
3128                         int rv = tls12_check_peer_sigalg(&md, s, p, pkey);
3129                         if (rv == -1)
3130                                 {
3131                                 al = SSL_AD_INTERNAL_ERROR;
3132                                 goto f_err;
3133                                 }
3134                         else if (rv == 0)
3135                                 {
3136                                 al = SSL_AD_DECODE_ERROR;
3137                                 goto f_err;
3138                                 }
3139 #ifdef SSL_DEBUG
3140 fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
3141 #endif
3142                         p += 2;
3143                         n -= 2;
3144                         }
3145                 n2s(p,i);
3146                 n-=2;
3147                 if (i > n)
3148                         {
3149                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
3150                         al=SSL_AD_DECODE_ERROR;
3151                         goto f_err;
3152                         }
3153         }
3154         j=EVP_PKEY_size(pkey);
3155         if ((i > j) || (n > j) || (n <= 0))
3156                 {
3157                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
3158                 al=SSL_AD_DECODE_ERROR;
3159                 goto f_err;
3160                 }
3161
3162         if (SSL_USE_SIGALGS(s))
3163                 {
3164                 long hdatalen = 0;
3165                 void *hdata;
3166                 hdatalen = BIO_get_mem_data(s->s3->handshake_buffer, &hdata);
3167                 if (hdatalen <= 0)
3168                         {
3169                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, ERR_R_INTERNAL_ERROR);
3170                         al=SSL_AD_INTERNAL_ERROR;
3171                         goto f_err;
3172                         }
3173 #ifdef SSL_DEBUG
3174                 fprintf(stderr, "Using TLS 1.2 with client verify alg %s\n",
3175                                                         EVP_MD_name(md));
3176 #endif
3177                 if (!EVP_VerifyInit_ex(&mctx, md, NULL)
3178                         || !EVP_VerifyUpdate(&mctx, hdata, hdatalen))
3179                         {
3180                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, ERR_R_EVP_LIB);
3181                         al=SSL_AD_INTERNAL_ERROR;
3182                         goto f_err;
3183                         }
3184
3185                 if (EVP_VerifyFinal(&mctx, p , i, pkey) <= 0)
3186                         {
3187                         al=SSL_AD_DECRYPT_ERROR;
3188                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_SIGNATURE);
3189                         goto f_err;
3190                         }
3191                 }
3192         else
3193 #ifndef OPENSSL_NO_RSA
3194         if (pkey->type == EVP_PKEY_RSA)
3195                 {
3196                 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
3197                         MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i,
3198                                                         pkey->pkey.rsa);
3199                 if (i < 0)
3200                         {
3201                         al=SSL_AD_DECRYPT_ERROR;
3202                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
3203                         goto f_err;
3204                         }
3205                 if (i == 0)
3206                         {
3207                         al=SSL_AD_DECRYPT_ERROR;
3208                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
3209                         goto f_err;
3210                         }
3211                 }
3212         else
3213 #endif
3214 #ifndef OPENSSL_NO_DSA
3215                 if (pkey->type == EVP_PKEY_DSA)
3216                 {
3217                 j=DSA_verify(pkey->save_type,
3218                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
3219                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
3220                 if (j <= 0)
3221                         {
3222                         /* bad signature */
3223                         al=SSL_AD_DECRYPT_ERROR;
3224                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
3225                         goto f_err;
3226                         }
3227                 }
3228         else
3229 #endif
3230 #ifndef OPENSSL_NO_ECDSA
3231                 if (pkey->type == EVP_PKEY_EC)
3232                 {
3233                 j=ECDSA_verify(pkey->save_type,
3234                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
3235                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.ec);
3236                 if (j <= 0)
3237                         {
3238                         /* bad signature */
3239                         al=SSL_AD_DECRYPT_ERROR;
3240                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
3241                             SSL_R_BAD_ECDSA_SIGNATURE);
3242                         goto f_err;
3243                         }
3244                 }
3245         else
3246 #endif
3247         if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001)
3248                 {   unsigned char signature[64];
3249                         int idx;
3250                         EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new(pkey,NULL);
3251                         EVP_PKEY_verify_init(pctx);
3252                         if (i!=64) {
3253                                 fprintf(stderr,"GOST signature length is %d",i);
3254                         }
3255                         for (idx=0;idx<64;idx++) {
3256                                 signature[63-idx]=p[idx];
3257                         }
3258                         j=EVP_PKEY_verify(pctx,signature,64,s->s3->tmp.cert_verify_md,32);
3259                         EVP_PKEY_CTX_free(pctx);
3260                         if (j<=0)
3261                                 {
3262                                 al=SSL_AD_DECRYPT_ERROR;
3263                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
3264                                         SSL_R_BAD_ECDSA_SIGNATURE);
3265                                 goto f_err;
3266                                 }
3267                 }
3268         else
3269                 {
3270                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
3271                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
3272                 goto f_err;
3273                 }
3274
3275
3276         ret=1;
3277         if (0)
3278                 {
3279 f_err:
3280                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
3281                 }
3282 end:
3283         if (s->s3->handshake_buffer)
3284                 {
3285                 BIO_free(s->s3->handshake_buffer);
3286                 s->s3->handshake_buffer = NULL;
3287                 s->s3->flags &= ~TLS1_FLAGS_KEEP_HANDSHAKE;
3288                 }
3289         EVP_MD_CTX_cleanup(&mctx);
3290         EVP_PKEY_free(pkey);
3291         return(ret);
3292         }
3293
3294 int ssl3_get_client_certificate(SSL *s)
3295         {
3296         int i,ok,al,ret= -1;
3297         X509 *x=NULL;
3298         unsigned long l,nc,llen,n;
3299         const unsigned char *p,*q;
3300         unsigned char *d;
3301         STACK_OF(X509) *sk=NULL;
3302
3303         n=s->method->ssl_get_message(s,
3304                 SSL3_ST_SR_CERT_A,
3305                 SSL3_ST_SR_CERT_B,
3306                 -1,
3307                 s->max_cert_list,
3308                 &ok);
3309
3310         if (!ok) return((int)n);
3311
3312         if      (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
3313                 {
3314                 if (    (s->verify_mode & SSL_VERIFY_PEER) &&
3315                         (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
3316                         {
3317                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
3318                         al=SSL_AD_HANDSHAKE_FAILURE;
3319                         goto f_err;
3320                         }
3321                 /* If tls asked for a client cert, the client must return a 0 list */
3322                 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
3323                         {
3324                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
3325                         al=SSL_AD_UNEXPECTED_MESSAGE;
3326                         goto f_err;
3327                         }
3328                 s->s3->tmp.reuse_message=1;
3329                 return(1);
3330                 }
3331
3332         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
3333                 {
3334                 al=SSL_AD_UNEXPECTED_MESSAGE;
3335                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
3336                 goto f_err;
3337                 }
3338         p=d=(unsigned char *)s->init_msg;
3339
3340         if ((sk=sk_X509_new_null()) == NULL)
3341                 {
3342                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
3343                 goto err;
3344                 }
3345
3346         n2l3(p,llen);
3347         if (llen+3 != n)
3348                 {
3349                 al=SSL_AD_DECODE_ERROR;
3350                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
3351                 goto f_err;
3352                 }
3353         for (nc=0; nc<llen; )
3354                 {
3355                 n2l3(p,l);
3356                 if ((l+nc+3) > llen)
3357                         {
3358                         al=SSL_AD_DECODE_ERROR;
3359                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
3360                         goto f_err;
3361                         }
3362
3363                 q=p;
3364                 x=d2i_X509(NULL,&p,l);
3365                 if (x == NULL)
3366                         {
3367                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
3368                         goto err;
3369                         }
3370                 if (p != (q+l))
3371                         {
3372                         al=SSL_AD_DECODE_ERROR;
3373                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
3374                         goto f_err;
3375                         }
3376                 if (!sk_X509_push(sk,x))
3377                         {
3378                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
3379                         goto err;
3380                         }
3381                 x=NULL;
3382                 nc+=l+3;
3383                 }
3384
3385         if (sk_X509_num(sk) <= 0)
3386                 {
3387                 /* TLS does not mind 0 certs returned */
3388                 if (s->version == SSL3_VERSION)
3389                         {
3390                         al=SSL_AD_HANDSHAKE_FAILURE;
3391                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
3392                         goto f_err;
3393                         }
3394                 /* Fail for TLS only if we required a certificate */
3395                 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
3396                          (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
3397                         {
3398                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
3399                         al=SSL_AD_HANDSHAKE_FAILURE;
3400                         goto f_err;
3401                         }
3402                 /* No client certificate so digest cached records */
3403                 if (s->s3->handshake_buffer && !ssl3_digest_cached_records(s))
3404                         {
3405                         al=SSL_AD_INTERNAL_ERROR;
3406                         goto f_err;
3407                         }
3408                 }
3409         else
3410                 {
3411                 i=ssl_verify_cert_chain(s,sk);
3412                 if (i <= 0)
3413                         {
3414                         al=ssl_verify_alarm_type(s->verify_result);
3415                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
3416                         goto f_err;
3417                         }
3418                 }
3419
3420         if (s->session->peer != NULL) /* This should not be needed */
3421                 X509_free(s->session->peer);
3422         s->session->peer=sk_X509_shift(sk);
3423         s->session->verify_result = s->verify_result;
3424
3425         /* With the current implementation, sess_cert will always be NULL
3426          * when we arrive here. */
3427         if (s->session->sess_cert == NULL)
3428                 {
3429                 s->session->sess_cert = ssl_sess_cert_new();
3430                 if (s->session->sess_cert == NULL)
3431                         {
3432                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
3433                         goto err;
3434                         }
3435                 }
3436         if (s->session->sess_cert->cert_chain != NULL)
3437                 sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free);
3438         s->session->sess_cert->cert_chain=sk;
3439         /* Inconsistency alert: cert_chain does *not* include the
3440          * peer's own certificate, while we do include it in s3_clnt.c */
3441
3442         sk=NULL;
3443
3444         ret=1;
3445         if (0)
3446                 {
3447 f_err:
3448                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
3449                 }
3450 err:
3451         if (x != NULL) X509_free(x);
3452         if (sk != NULL) sk_X509_pop_free(sk,X509_free);
3453         return(ret);
3454         }
3455
3456 int ssl3_send_server_certificate(SSL *s)
3457         {
3458         CERT_PKEY *cpk;
3459
3460         if (s->state == SSL3_ST_SW_CERT_A)
3461                 {
3462                 cpk=ssl_get_server_send_pkey(s);
3463                 if (cpk == NULL)
3464                         {
3465                         /* VRS: allow null cert if auth == KRB5 */
3466                         if ((s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5) ||
3467                             (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5))
3468                                 {
3469                                 SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
3470                                 return(0);
3471                                 }
3472                         }
3473
3474                 if (!ssl3_output_cert_chain(s,cpk))
3475                         {
3476                         SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
3477                         return(0);
3478                         }
3479                 s->state=SSL3_ST_SW_CERT_B;
3480                 }
3481
3482         /* SSL3_ST_SW_CERT_B */
3483         return ssl_do_write(s);
3484         }
3485
3486 #ifndef OPENSSL_NO_TLSEXT
3487 /* send a new session ticket (not necessarily for a new session) */
3488 int ssl3_send_newsession_ticket(SSL *s)
3489         {
3490         if (s->state == SSL3_ST_SW_SESSION_TICKET_A)
3491                 {
3492                 unsigned char *p, *senc, *macstart;
3493                 const unsigned char *const_p;
3494                 int len, slen_full, slen;
3495                 SSL_SESSION *sess;
3496                 unsigned int hlen;
3497                 EVP_CIPHER_CTX ctx;
3498                 HMAC_CTX hctx;
3499                 SSL_CTX *tctx = s->initial_ctx;
3500                 unsigned char iv[EVP_MAX_IV_LENGTH];
3501                 unsigned char key_name[16];
3502
3503                 /* get session encoding length */
3504                 slen_full = i2d_SSL_SESSION(s->session, NULL);
3505                 /* Some length values are 16 bits, so forget it if session is
3506                  * too long
3507                  */
3508                 if (slen_full > 0xFF00)
3509                         return -1;
3510                 senc = OPENSSL_malloc(slen_full);
3511                 if (!senc)
3512                         return -1;
3513                 p = senc;
3514                 i2d_SSL_SESSION(s->session, &p);
3515
3516                 /* create a fresh copy (not shared with other threads) to clean up */
3517                 const_p = senc;
3518                 sess = d2i_SSL_SESSION(NULL, &const_p, slen_full);
3519                 if (sess == NULL)
3520                         {
3521                         OPENSSL_free(senc);
3522                         return -1;
3523                         }
3524                 sess->session_id_length = 0; /* ID is irrelevant for the ticket */
3525
3526                 slen = i2d_SSL_SESSION(sess, NULL);
3527                 if (slen > slen_full) /* shouldn't ever happen */
3528                         {
3529                         OPENSSL_free(senc);
3530                         return -1;
3531                         }
3532                 p = senc;
3533                 i2d_SSL_SESSION(sess, &p);
3534                 SSL_SESSION_free(sess);
3535
3536                 /* Grow buffer if need be: the length calculation is as
3537                  * follows handshake_header_length +
3538                  * 4 (ticket lifetime hint) + 2 (ticket length) +
3539                  * 16 (key name) + max_iv_len (iv length) +
3540                  * session_length + max_enc_block_size (max encrypted session
3541                  * length) + max_md_size (HMAC).
3542                  */
3543                 if (!BUF_MEM_grow(s->init_buf,
3544                         SSL_HM_HEADER_LENGTH(s) + 22 + EVP_MAX_IV_LENGTH +
3545                         EVP_MAX_BLOCK_LENGTH + EVP_MAX_MD_SIZE + slen))
3546                         return -1;
3547                 p = ssl_handshake_start(s);
3548                 EVP_CIPHER_CTX_init(&ctx);
3549                 HMAC_CTX_init(&hctx);
3550                 /* Initialize HMAC and cipher contexts. If callback present
3551                  * it does all the work otherwise use generated values
3552                  * from parent ctx.
3553                  */
3554                 if (tctx->tlsext_ticket_key_cb)
3555                         {
3556                         if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx,
3557                                                          &hctx, 1) < 0)
3558                                 {
3559                                 OPENSSL_free(senc);
3560                                 return -1;
3561                                 }
3562                         }
3563                 else
3564                         {
3565                         RAND_pseudo_bytes(iv, 16);
3566                         EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
3567                                         tctx->tlsext_tick_aes_key, iv);
3568                         HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
3569                                         tlsext_tick_md(), NULL);
3570                         memcpy(key_name, tctx->tlsext_tick_key_name, 16);
3571                         }
3572
3573                 /* Ticket lifetime hint (advisory only):
3574                  * We leave this unspecified for resumed session (for simplicity),
3575                  * and guess that tickets for new sessions will live as long
3576                  * as their sessions. */
3577                 l2n(s->hit ? 0 : s->session->timeout, p);
3578
3579                 /* Skip ticket length for now */
3580                 p += 2;
3581                 /* Output key name */
3582                 macstart = p;
3583                 memcpy(p, key_name, 16);
3584                 p += 16;
3585                 /* output IV */
3586                 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
3587                 p += EVP_CIPHER_CTX_iv_length(&ctx);
3588                 /* Encrypt session data */
3589                 EVP_EncryptUpdate(&ctx, p, &len, senc, slen);
3590                 p += len;
3591                 EVP_EncryptFinal(&ctx, p, &len);
3592                 p += len;
3593                 EVP_CIPHER_CTX_cleanup(&ctx);
3594
3595                 HMAC_Update(&hctx, macstart, p - macstart);
3596                 HMAC_Final(&hctx, p, &hlen);
3597                 HMAC_CTX_cleanup(&hctx);
3598
3599                 p += hlen;
3600                 /* Now write out lengths: p points to end of data written */
3601                 /* Total length */
3602                 len = p - ssl_handshake_start(s);
3603                 ssl_set_handshake_header(s, SSL3_MT_NEWSESSION_TICKET, len);
3604                 /* Skip ticket lifetime hint */
3605                 p = ssl_handshake_start(s) + 4;
3606                 s2n(len - 6, p);
3607                 s->state=SSL3_ST_SW_SESSION_TICKET_B;
3608                 OPENSSL_free(senc);
3609                 }
3610
3611         /* SSL3_ST_SW_SESSION_TICKET_B */
3612         return ssl_do_write(s);
3613         }
3614
3615 int ssl3_send_cert_status(SSL *s)
3616         {
3617         if (s->state == SSL3_ST_SW_CERT_STATUS_A)
3618                 {
3619                 unsigned char *p;
3620                 /* Grow buffer if need be: the length calculation is as
3621                  * follows 1 (message type) + 3 (message length) +
3622                  * 1 (ocsp response type) + 3 (ocsp response length)
3623                  * + (ocsp response)
3624                  */
3625                 if (!BUF_MEM_grow(s->init_buf, 8 + s->tlsext_ocsp_resplen))
3626                         return -1;
3627
3628                 p=(unsigned char *)s->init_buf->data;
3629
3630                 /* do the header */
3631                 *(p++)=SSL3_MT_CERTIFICATE_STATUS;
3632                 /* message length */
3633                 l2n3(s->tlsext_ocsp_resplen + 4, p);
3634                 /* status type */
3635                 *(p++)= s->tlsext_status_type;
3636                 /* length of OCSP response */
3637                 l2n3(s->tlsext_ocsp_resplen, p);
3638                 /* actual response */
3639                 memcpy(p, s->tlsext_ocsp_resp, s->tlsext_ocsp_resplen);
3640                 /* number of bytes to write */
3641                 s->init_num = 8 + s->tlsext_ocsp_resplen;
3642                 s->state=SSL3_ST_SW_CERT_STATUS_B;
3643                 s->init_off = 0;
3644                 }
3645
3646         /* SSL3_ST_SW_CERT_STATUS_B */
3647         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3648         }
3649
3650 # ifndef OPENSSL_NO_NEXTPROTONEG
3651 /* ssl3_get_next_proto reads a Next Protocol Negotiation handshake message. It
3652  * sets the next_proto member in s if found */
3653 int ssl3_get_next_proto(SSL *s)
3654         {
3655         int ok;
3656         int proto_len, padding_len;
3657         long n;
3658         const unsigned char *p;
3659
3660         /* Clients cannot send a NextProtocol message if we didn't see the
3661          * extension in their ClientHello */
3662         if (!s->s3->next_proto_neg_seen)
3663                 {
3664                 SSLerr(SSL_F_SSL3_GET_NEXT_PROTO,SSL_R_GOT_NEXT_PROTO_WITHOUT_EXTENSION);
3665                 return -1;
3666                 }
3667
3668         n=s->method->ssl_get_message(s,
3669                 SSL3_ST_SR_NEXT_PROTO_A,
3670                 SSL3_ST_SR_NEXT_PROTO_B,
3671                 SSL3_MT_NEXT_PROTO,
3672                 514,  /* See the payload format below */
3673                 &ok);
3674
3675         if (!ok)
3676                 return((int)n);
3677
3678         /* s->state doesn't reflect whether ChangeCipherSpec has been received
3679          * in this handshake, but s->s3->change_cipher_spec does (will be reset
3680          * by ssl3_get_finished). */
3681         if (!s->s3->change_cipher_spec)
3682                 {
3683                 SSLerr(SSL_F_SSL3_GET_NEXT_PROTO,SSL_R_GOT_NEXT_PROTO_BEFORE_A_CCS);
3684                 return -1;
3685                 }
3686
3687         if (n < 2)
3688                 return 0;  /* The body must be > 1 bytes long */
3689
3690         p=(unsigned char *)s->init_msg;
3691
3692         /* The payload looks like:
3693          *   uint8 proto_len;
3694          *   uint8 proto[proto_len];
3695          *   uint8 padding_len;
3696          *   uint8 padding[padding_len];
3697          */
3698         proto_len = p[0];
3699         if (proto_len + 2 > s->init_num)
3700                 return 0;
3701         padding_len = p[proto_len + 1];
3702         if (proto_len + padding_len + 2 != s->init_num)
3703                 return 0;
3704
3705         s->next_proto_negotiated = OPENSSL_malloc(proto_len);
3706         if (!s->next_proto_negotiated)
3707                 {
3708                 SSLerr(SSL_F_SSL3_GET_NEXT_PROTO,ERR_R_MALLOC_FAILURE);
3709                 return 0;
3710                 }
3711         memcpy(s->next_proto_negotiated, p + 1, proto_len);
3712         s->next_proto_negotiated_len = proto_len;
3713
3714         return 1;
3715         }
3716 # endif
3717
3718 #endif