ssl/s3_srvr.c

   1 /* ssl/s3_srvr.c -*- mode:C; c-file-style: "eay" -*- */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58 /* ====================================================================
  59  * Copyright (c) 1998-2007 The OpenSSL Project.  All rights reserved.
  60  *
  61  * Redistribution and use in source and binary forms, with or without
  62  * modification, are permitted provided that the following conditions
  63  * are met:
  64  *
  65  * 1. Redistributions of source code must retain the above copyright
  66  *    notice, this list of conditions and the following disclaimer.
  67  *
  68  * 2. Redistributions in binary form must reproduce the above copyright
  69  *    notice, this list of conditions and the following disclaimer in
  70  *    the documentation and/or other materials provided with the
  71  *    distribution.
  72  *
  73  * 3. All advertising materials mentioning features or use of this
  74  *    software must display the following acknowledgment:
  75  *    "This product includes software developed by the OpenSSL Project
  76  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  77  *
  78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  79  *    endorse or promote products derived from this software without
  80  *    prior written permission. For written permission, please contact
  81  *    openssl-core@openssl.org.
  82  *
  83  * 5. Products derived from this software may not be called "OpenSSL"
  84  *    nor may "OpenSSL" appear in their names without prior written
  85  *    permission of the OpenSSL Project.
  86  *
  87  * 6. Redistributions of any form whatsoever must retain the following
  88  *    acknowledgment:
  89  *    "This product includes software developed by the OpenSSL Project
  90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  91  *
  92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  95  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 103  * OF THE POSSIBILITY OF SUCH DAMAGE.
 104  * ====================================================================
 105  *
 106  * This product includes cryptographic software written by Eric Young
 107  * (eay@cryptsoft.com).  This product includes software written by Tim
 108  * Hudson (tjh@cryptsoft.com).
 109  *
 110  */
 111 /* ====================================================================
 112  * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
 113  *
 114  * Portions of the attached software ("Contribution") are developed by
 115  * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
 116  *
 117  * The Contribution is licensed pursuant to the OpenSSL open source
 118  * license provided above.
 119  *
 120  * ECC cipher suite support in OpenSSL originally written by
 121  * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories.
 122  *
 123  */
 124 /* ====================================================================
 125  * Copyright 2005 Nokia. All rights reserved.
 126  *
 127  * The portions of the attached software ("Contribution") is developed by
 128  * Nokia Corporation and is licensed pursuant to the OpenSSL open source
 129  * license.
 130  *
 131  * The Contribution, originally written by Mika Kousa and Pasi Eronen of
 132  * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
 133  * support (see RFC 4279) to OpenSSL.
 134  *
 135  * No patent licenses or other rights except those expressly stated in
 136  * the OpenSSL open source license shall be deemed granted or received
 137  * expressly, by implication, estoppel, or otherwise.
 138  *
 139  * No assurances are provided by Nokia that the Contribution does not
 140  * infringe the patent or other intellectual property rights of any third
 141  * party or that the license provides you with all the necessary rights
 142  * to make use of the Contribution.
 143  *
 144  * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
 145  * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
 146  * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
 147  * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
 148  * OTHERWISE.
 149  */
 150
 151 #define REUSE_CIPHER_BUG
 152 #define NETSCAPE_HANG_BUG
 153
 154 #include <stdio.h>
 155 #include "ssl_locl.h"
 156 #include "kssl_lcl.h"
 157 #include <openssl/buffer.h>
 158 #include <openssl/rand.h>
 159 #include <openssl/objects.h>
 160 #include <openssl/evp.h>
 161 #include <openssl/hmac.h>
 162 #include <openssl/x509.h>
 163 #ifndef OPENSSL_NO_DH
 164 #include <openssl/dh.h>
 165 #endif
 166 #include <openssl/bn.h>
 167 #ifndef OPENSSL_NO_KRB5
 168 #include <openssl/krb5_asn.h>
 169 #endif
 170 #include <openssl/md5.h>
 171
 172 static const SSL_METHOD *ssl3_get_server_method(int ver);
 173
 174 static const SSL_METHOD *ssl3_get_server_method(int ver)
 175         {
 176         if (ver == SSL3_VERSION)
 177                 return(SSLv3_server_method());
 178         else
 179                 return(NULL);
 180         }
 181
 182 #ifndef OPENSSL_NO_SRP
 183 static int ssl_check_srp_ext_ClientHello(SSL *s, int *al)
 184         {
 185         int ret = SSL_ERROR_NONE;
 186
 187         *al = SSL_AD_UNRECOGNIZED_NAME;
 188
 189         if ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP) &&
 190             (s->srp_ctx.TLS_ext_srp_username_callback != NULL))
 191                 {
 192                 if(s->srp_ctx.login == NULL)
 193                         {
 194                         /* RFC 5054 says SHOULD reject,
 195                            we do so if There is no srp login name */
 196                         ret = SSL3_AL_FATAL;
 197                         *al = SSL_AD_UNKNOWN_PSK_IDENTITY;
 198                         }
 199                 else
 200                         {
 201                         ret = SSL_srp_server_param_with_username(s,al);
 202                         }
 203                 }
 204         return ret;
 205         }
 206 #endif
 207
 208 IMPLEMENT_ssl3_meth_func(SSLv3_server_method,
 209                         ssl3_accept,
 210                         ssl_undefined_function,
 211                         ssl3_get_server_method)
 212
 213 int ssl3_accept(SSL *s)
 214         {
 215         BUF_MEM *buf;
 216         unsigned long alg_k,Time=(unsigned long)time(NULL);
 217         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 218         int ret= -1;
 219         int new_state,state,skip=0;
 220
 221         RAND_add(&Time,sizeof(Time),0);
 222         ERR_clear_error();
 223         clear_sys_error();
 224
 225         if (s->info_callback != NULL)
 226                 cb=s->info_callback;
 227         else if (s->ctx->info_callback != NULL)
 228                 cb=s->ctx->info_callback;
 229
 230         /* init things to blank */
 231         s->in_handshake++;
 232         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 233
 234         if (s->cert == NULL)
 235                 {
 236                 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
 237                 return(-1);
 238                 }
 239
 240 #ifndef OPENSSL_NO_HEARTBEATS
 241         /* If we're awaiting a HeartbeatResponse, pretend we
 242          * already got and don't await it anymore, because
 243          * Heartbeats don't make sense during handshakes anyway.
 244          */
 245         if (s->tlsext_hb_pending)
 246                 {
 247                 s->tlsext_hb_pending = 0;
 248                 s->tlsext_hb_seq++;
 249                 }
 250 #endif
 251
 252         for (;;)
 253                 {
 254                 state=s->state;
 255
 256                 switch (s->state)
 257                         {
 258                 case SSL_ST_RENEGOTIATE:
 259                         s->renegotiate=1;
 260                         /* s->state=SSL_ST_ACCEPT; */
 261
 262                 case SSL_ST_BEFORE:
 263                 case SSL_ST_ACCEPT:
 264                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 265                 case SSL_ST_OK|SSL_ST_ACCEPT:
 266
 267                         s->server=1;
 268                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 269
 270                         if ((s->version>>8) != 3)
 271                                 {
 272                                 SSLerr(SSL_F_SSL3_ACCEPT, ERR_R_INTERNAL_ERROR);
 273                                 return -1;
 274                                 }
 275                         s->type=SSL_ST_ACCEPT;
 276
 277                         if (s->init_buf == NULL)
 278                                 {
 279                                 if ((buf=BUF_MEM_new()) == NULL)
 280                                         {
 281                                         ret= -1;
 282                                         goto end;
 283                                         }
 284                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 285                                         {
 286                                         ret= -1;
 287                                         goto end;
 288                                         }
 289                                 s->init_buf=buf;
 290                                 }
 291
 292                         if (!ssl3_setup_buffers(s))
 293                                 {
 294                                 ret= -1;
 295                                 goto end;
 296                                 }
 297
 298                         s->init_num=0;
 299                         s->s3->flags &= ~SSL3_FLAGS_SGC_RESTART_DONE;
 300                         s->s3->flags &= ~TLS1_FLAGS_SKIP_CERT_VERIFY;
 301
 302                         if (s->state != SSL_ST_RENEGOTIATE)
 303                                 {
 304                                 /* Ok, we now need to push on a buffering BIO so that
 305                                  * the output is sent in a way that TCP likes :-)
 306                                  */
 307                                 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
 308
 309                                 ssl3_init_finished_mac(s);
 310                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
 311                                 s->ctx->stats.sess_accept++;
 312                                 }
 313                         else if (!s->s3->send_connection_binding &&
 314                                 !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
 315                                 {
 316                                 /* Server attempting to renegotiate with
 317                                  * client that doesn't support secure
 318                                  * renegotiation.
 319                                  */
 320                                 SSLerr(SSL_F_SSL3_ACCEPT, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
 321                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
 322                                 ret = -1;
 323                                 goto end;
 324                                 }
 325                         else
 326                                 {
 327                                 /* s->state == SSL_ST_RENEGOTIATE,
 328                                  * we will just send a HelloRequest */
 329                                 s->ctx->stats.sess_accept_renegotiate++;
 330                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
 331                                 }
 332                         break;
 333
 334                 case SSL3_ST_SW_HELLO_REQ_A:
 335                 case SSL3_ST_SW_HELLO_REQ_B:
 336
 337                         s->shutdown=0;
 338                         ret=ssl3_send_hello_request(s);
 339                         if (ret <= 0) goto end;
 340                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
 341                         s->state=SSL3_ST_SW_FLUSH;
 342                         s->init_num=0;
 343
 344                         ssl3_init_finished_mac(s);
 345                         break;
 346
 347                 case SSL3_ST_SW_HELLO_REQ_C:
 348                         s->state=SSL_ST_OK;
 349                         break;
 350
 351                 case SSL3_ST_SR_CLNT_HELLO_A:
 352                 case SSL3_ST_SR_CLNT_HELLO_B:
 353                 case SSL3_ST_SR_CLNT_HELLO_C:
 354
 355                         if (s->rwstate != SSL_X509_LOOKUP)
 356                         {
 357                                 ret=ssl3_get_client_hello(s);
 358                                 if (ret <= 0) goto end;
 359                         }
 360 #ifndef OPENSSL_NO_SRP
 361                         {
 362                         int al;
 363                         if ((ret = ssl_check_srp_ext_ClientHello(s,&al))  < 0)
 364                                         {
 365                                         /* callback indicates firther work to be done */
 366                                         s->rwstate=SSL_X509_LOOKUP;
 367                                         goto end;
 368                                         }
 369                         if (ret != SSL_ERROR_NONE)
 370                                 {
 371                                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
 372                                 /* This is not really an error but the only means to
 373                                    for a client to detect whether srp is supported. */
 374                                    if (al != TLS1_AD_UNKNOWN_PSK_IDENTITY)
 375                                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_CLIENTHELLO_TLSEXT);
 376                                 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
 377                                 ret= -1;
 378                                 goto end;
 379                                 }
 380                         }
 381 #endif
 382
 383                         s->renegotiate = 2;
 384                         s->state=SSL3_ST_SW_SRVR_HELLO_A;
 385                         s->init_num=0;
 386                         break;
 387
 388                 case SSL3_ST_SW_SRVR_HELLO_A:
 389                 case SSL3_ST_SW_SRVR_HELLO_B:
 390                         ret=ssl3_send_server_hello(s);
 391                         if (ret <= 0) goto end;
 392 #ifndef OPENSSL_NO_TLSEXT
 393                         if (s->hit)
 394                                 {
 395                                 if (s->tlsext_ticket_expected)
 396                                         s->state=SSL3_ST_SW_SESSION_TICKET_A;
 397                                 else
 398                                         s->state=SSL3_ST_SW_CHANGE_A;
 399                                 }
 400 #else
 401                         if (s->hit)
 402                                         s->state=SSL3_ST_SW_CHANGE_A;
 403 #endif
 404                         else
 405 #ifndef OPENSSL_NO_TLSEXT
 406                                 s->state = SSL3_ST_SW_SUPPLEMENTAL_DATA_A;
 407 #else
 408                         s->state = SSL3_ST_SW_CERT_A;
 409 #endif
 410                         s->init_num = 0;
 411                         break;
 412
 413 #ifndef OPENSSL_NO_TLSEXT
 414                 case SSL3_ST_SW_SUPPLEMENTAL_DATA_A:
 415                 case SSL3_ST_SW_SUPPLEMENTAL_DATA_B:
 416                         /* We promised to send an audit proof in the hello. */
 417                         if (s->s3->tlsext_authz_promised_to_client)
 418                                 {
 419                                 ret = tls1_send_server_supplemental_data(s);
 420                                 if (ret <= 0) goto end;
 421                                 }
 422                         else
 423                                 skip = 1;
 424
 425                         s->state = SSL3_ST_SW_CERT_A;
 426                         s->init_num = 0;
 427                         break;
 428 #endif
 429
 430                 case SSL3_ST_SW_CERT_A:
 431                 case SSL3_ST_SW_CERT_B:
 432                         /* Check if it is anon DH or anon ECDH, */
 433                         /* normal PSK or KRB5 or SRP */
 434                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
 435                                 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)
 436                                 && !(s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
 437                                 {
 438                                 ret=ssl3_send_server_certificate(s);
 439                                 if (ret <= 0) goto end;
 440 #ifndef OPENSSL_NO_TLSEXT
 441                                 if (s->tlsext_status_expected)
 442                                         s->state=SSL3_ST_SW_CERT_STATUS_A;
 443                                 else
 444                                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 445                                 }
 446                         else
 447                                 {
 448                                 skip = 1;
 449                                 s->state=SSL3_ST_SW_KEY_EXCH_A;
 450                                 }
 451 #else
 452                                 }
 453                         else
 454                                 skip=1;
 455
 456                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 457 #endif
 458                         s->init_num=0;
 459                         break;
 460
 461                 case SSL3_ST_SW_KEY_EXCH_A:
 462                 case SSL3_ST_SW_KEY_EXCH_B:
 463                         alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
 464
 465                         /* clear this, it may get reset by
 466                          * send_server_key_exchange */
 467                         if ((s->options & SSL_OP_EPHEMERAL_RSA)
 468 #ifndef OPENSSL_NO_KRB5
 469                                 && !(alg_k & SSL_kKRB5)
 470 #endif /* OPENSSL_NO_KRB5 */
 471                                 )
 472                                 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
 473                                  * even when forbidden by protocol specs
 474                                  * (handshake may fail as clients are not required to
 475                                  * be able to handle this) */
 476                                 s->s3->tmp.use_rsa_tmp=1;
 477                         else
 478                                 s->s3->tmp.use_rsa_tmp=0;
 479
 480
 481                         /* only send if a DH key exchange, fortezza or
 482                          * RSA but we have a sign only certificate
 483                          *
 484                          * PSK: may send PSK identity hints
 485                          *
 486                          * For ECC ciphersuites, we send a serverKeyExchange
 487                          * message only if the cipher suite is either
 488                          * ECDH-anon or ECDHE. In other cases, the
 489                          * server certificate contains the server's
 490                          * public key for key exchange.
 491                          */
 492                         if (s->s3->tmp.use_rsa_tmp
 493                         /* PSK: send ServerKeyExchange if PSK identity
 494                          * hint if provided */
 495 #ifndef OPENSSL_NO_PSK
 496                             || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
 497 #endif
 498 #ifndef OPENSSL_NO_SRP
 499                             /* SRP: send ServerKeyExchange */
 500                             || (alg_k & SSL_kSRP)
 501 #endif
 502                             || (alg_k & SSL_kEDH)
 503                             || (alg_k & SSL_kEECDH)
 504                             || ((alg_k & SSL_kRSA)
 505                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
 506                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
 507                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
 508                                         )
 509                                     )
 510                                 )
 511                             )
 512                                 {
 513                                 ret=ssl3_send_server_key_exchange(s);
 514                                 if (ret <= 0) goto end;
 515                                 }
 516                         else
 517                                 skip=1;
 518
 519                         s->state=SSL3_ST_SW_CERT_REQ_A;
 520                         s->init_num=0;
 521                         break;
 522
 523                 case SSL3_ST_SW_CERT_REQ_A:
 524                 case SSL3_ST_SW_CERT_REQ_B:
 525                         if (/* don't request cert unless asked for it: */
 526                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
 527                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
 528                                  * don't request cert during re-negotiation: */
 529                                 ((s->session->peer != NULL) &&
 530                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
 531                                 /* never request cert in anonymous ciphersuites
 532                                  * (see section "Certificate request" in SSL 3 drafts
 533                                  * and in RFC 2246): */
 534                                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
 535                                  /* ... except when the application insists on verification
 536                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
 537                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
 538                                  /* never request cert in Kerberos ciphersuites */
 539                                 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5)
 540                                 /* With normal PSK Certificates and
 541                                  * Certificate Requests are omitted */
 542                                 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 543                                 {
 544                                 /* no cert request */
 545                                 skip=1;
 546                                 s->s3->tmp.cert_request=0;
 547                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 548                                 if (s->s3->handshake_buffer)
 549                                         if (!ssl3_digest_cached_records(s))
 550                                                 return -1;
 551                                 }
 552                         else
 553                                 {
 554                                 s->s3->tmp.cert_request=1;
 555                                 ret=ssl3_send_certificate_request(s);
 556                                 if (ret <= 0) goto end;
 557 #ifndef NETSCAPE_HANG_BUG
 558                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 559 #else
 560                                 s->state=SSL3_ST_SW_FLUSH;
 561                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 562 #endif
 563                                 s->init_num=0;
 564                                 }
 565                         break;
 566
 567                 case SSL3_ST_SW_SRVR_DONE_A:
 568                 case SSL3_ST_SW_SRVR_DONE_B:
 569                         ret=ssl3_send_server_done(s);
 570                         if (ret <= 0) goto end;
 571                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 572                         s->state=SSL3_ST_SW_FLUSH;
 573                         s->init_num=0;
 574                         break;
 575
 576                 case SSL3_ST_SW_FLUSH:
 577
 578                         /* This code originally checked to see if
 579                          * any data was pending using BIO_CTRL_INFO
 580                          * and then flushed. This caused problems
 581                          * as documented in PR#1939. The proposed
 582                          * fix doesn't completely resolve this issue
 583                          * as buggy implementations of BIO_CTRL_PENDING
 584                          * still exist. So instead we just flush
 585                          * unconditionally.
 586                          */
 587
 588                         s->rwstate=SSL_WRITING;
 589                         if (BIO_flush(s->wbio) <= 0)
 590                                 {
 591                                 ret= -1;
 592                                 goto end;
 593                                 }
 594                         s->rwstate=SSL_NOTHING;
 595
 596                         s->state=s->s3->tmp.next_state;
 597                         break;
 598
 599                 case SSL3_ST_SR_CERT_A:
 600                 case SSL3_ST_SR_CERT_B:
 601                         /* Check for second client hello (MS SGC) */
 602                         ret = ssl3_check_client_hello(s);
 603                         if (ret <= 0)
 604                                 goto end;
 605                         if (ret == 2)
 606                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
 607                         else {
 608                                 if (s->s3->tmp.cert_request)
 609                                         {
 610                                         ret=ssl3_get_client_certificate(s);
 611                                         if (ret <= 0) goto end;
 612                                         }
 613                                 s->init_num=0;
 614                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
 615                         }
 616                         break;
 617
 618                 case SSL3_ST_SR_KEY_EXCH_A:
 619                 case SSL3_ST_SR_KEY_EXCH_B:
 620                         ret=ssl3_get_client_key_exchange(s);
 621                         if (ret <= 0)
 622                                 goto end;
 623                         if (ret == 2)
 624                                 {
 625                                 /* For the ECDH ciphersuites when
 626                                  * the client sends its ECDH pub key in
 627                                  * a certificate, the CertificateVerify
 628                                  * message is not sent.
 629                                  * Also for GOST ciphersuites when
 630                                  * the client uses its key from the certificate
 631                                  * for key exchange.
 632                                  */
 633 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
 634                                 s->state=SSL3_ST_SR_FINISHED_A;
 635 #else
 636                                 if (s->s3->next_proto_neg_seen)
 637                                         s->state=SSL3_ST_SR_NEXT_PROTO_A;
 638                                 else
 639                                         s->state=SSL3_ST_SR_FINISHED_A;
 640 #endif
 641                                 s->init_num = 0;
 642                                 }
 643                         else if (TLS1_get_version(s) >= TLS1_2_VERSION)
 644                                 {
 645                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
 646                                 s->init_num=0;
 647                                 if (!s->session->peer)
 648                                         break;
 649                                 /* For TLS v1.2 freeze the handshake buffer
 650                                  * at this point and digest cached records.
 651                                  */
 652                                 if (!s->s3->handshake_buffer)
 653                                         {
 654                                         SSLerr(SSL_F_SSL3_ACCEPT,ERR_R_INTERNAL_ERROR);
 655                                         return -1;
 656                                         }
 657                                 s->s3->flags |= TLS1_FLAGS_KEEP_HANDSHAKE;
 658                                 if (!ssl3_digest_cached_records(s))
 659                                         return -1;
 660                                 }
 661                         else
 662                                 {
 663                                 int offset=0;
 664                                 int dgst_num;
 665
 666                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
 667                                 s->init_num=0;
 668
 669                                 /* We need to get hashes here so if there is
 670                                  * a client cert, it can be verified
 671                                  * FIXME - digest processing for CertificateVerify
 672                                  * should be generalized. But it is next step
 673                                  */
 674                                 if (s->s3->handshake_buffer)
 675                                         if (!ssl3_digest_cached_records(s))
 676                                                 return -1;
 677                                 for (dgst_num=0; dgst_num<SSL_MAX_DIGEST;dgst_num++)
 678                                         if (s->s3->handshake_dgst[dgst_num])
 679                                                 {
 680                                                 int dgst_size;
 681
 682                                                 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]));
 683                                                 dgst_size=EVP_MD_CTX_size(s->s3->handshake_dgst[dgst_num]);
 684                                                 if (dgst_size < 0)
 685                                                         {
 686                                                         ret = -1;
 687                                                         goto end;
 688                                                         }
 689                                                 offset+=dgst_size;
 690                                                 }
 691                                 }
 692                         break;
 693
 694                 case SSL3_ST_SR_CERT_VRFY_A:
 695                 case SSL3_ST_SR_CERT_VRFY_B:
 696
 697                         /* we should decide if we expected this one */
 698                         ret=ssl3_get_cert_verify(s);
 699                         if (ret <= 0) goto end;
 700
 701 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
 702                         s->state=SSL3_ST_SR_FINISHED_A;
 703 #else
 704                         if (s->s3->next_proto_neg_seen)
 705                                 s->state=SSL3_ST_SR_NEXT_PROTO_A;
 706                         else
 707                                 s->state=SSL3_ST_SR_FINISHED_A;
 708 #endif
 709                         s->init_num=0;
 710                         break;
 711
 712 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
 713                 case SSL3_ST_SR_NEXT_PROTO_A:
 714                 case SSL3_ST_SR_NEXT_PROTO_B:
 715                         ret=ssl3_get_next_proto(s);
 716                         if (ret <= 0) goto end;
 717                         s->init_num = 0;
 718                         s->state=SSL3_ST_SR_FINISHED_A;
 719                         break;
 720 #endif
 721
 722                 case SSL3_ST_SR_FINISHED_A:
 723                 case SSL3_ST_SR_FINISHED_B:
 724                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
 725                                 SSL3_ST_SR_FINISHED_B);
 726                         if (ret <= 0) goto end;
 727                         if (s->hit)
 728                                 s->state=SSL_ST_OK;
 729 #ifndef OPENSSL_NO_TLSEXT
 730                         else if (s->tlsext_ticket_expected)
 731                                 s->state=SSL3_ST_SW_SESSION_TICKET_A;
 732 #endif
 733                         else
 734                                 s->state=SSL3_ST_SW_CHANGE_A;
 735                         s->init_num=0;
 736                         break;
 737
 738 #ifndef OPENSSL_NO_TLSEXT
 739                 case SSL3_ST_SW_SESSION_TICKET_A:
 740                 case SSL3_ST_SW_SESSION_TICKET_B:
 741                         ret=ssl3_send_newsession_ticket(s);
 742                         if (ret <= 0) goto end;
 743                         s->state=SSL3_ST_SW_CHANGE_A;
 744                         s->init_num=0;
 745                         break;
 746
 747                 case SSL3_ST_SW_CERT_STATUS_A:
 748                 case SSL3_ST_SW_CERT_STATUS_B:
 749                         ret=ssl3_send_cert_status(s);
 750                         if (ret <= 0) goto end;
 751                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 752                         s->init_num=0;
 753                         break;
 754
 755 #endif
 756
 757                 case SSL3_ST_SW_CHANGE_A:
 758                 case SSL3_ST_SW_CHANGE_B:
 759
 760                         s->session->cipher=s->s3->tmp.new_cipher;
 761                         if (!s->method->ssl3_enc->setup_key_block(s))
 762                                 { ret= -1; goto end; }
 763
 764                         ret=ssl3_send_change_cipher_spec(s,
 765                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
 766
 767                         if (ret <= 0) goto end;
 768                         s->state=SSL3_ST_SW_FINISHED_A;
 769                         s->init_num=0;
 770
 771                         if (!s->method->ssl3_enc->change_cipher_state(s,
 772                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
 773                                 {
 774                                 ret= -1;
 775                                 goto end;
 776                                 }
 777
 778                         break;
 779
 780                 case SSL3_ST_SW_FINISHED_A:
 781                 case SSL3_ST_SW_FINISHED_B:
 782                         ret=ssl3_send_finished(s,
 783                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
 784                                 s->method->ssl3_enc->server_finished_label,
 785                                 s->method->ssl3_enc->server_finished_label_len);
 786                         if (ret <= 0) goto end;
 787                         s->state=SSL3_ST_SW_FLUSH;
 788                         if (s->hit)
 789                                 {
 790 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
 791                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 792 #else
 793                                 if (s->s3->next_proto_neg_seen)
 794                                         s->s3->tmp.next_state=SSL3_ST_SR_NEXT_PROTO_A;
 795                                 else
 796                                         s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 797 #endif
 798                                 }
 799                         else
 800                                 s->s3->tmp.next_state=SSL_ST_OK;
 801                         s->init_num=0;
 802                         break;
 803
 804                 case SSL_ST_OK:
 805                         /* clean a few things up */
 806                         ssl3_cleanup_key_block(s);
 807
 808                         BUF_MEM_free(s->init_buf);
 809                         s->init_buf=NULL;
 810
 811                         /* remove buffering on output */
 812                         ssl_free_wbio_buffer(s);
 813
 814                         s->init_num=0;
 815
 816                         if (s->renegotiate == 2) /* skipped if we just sent a HelloRequest */
 817                                 {
 818                                 s->renegotiate=0;
 819                                 s->new_session=0;
 820
 821                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 822
 823                                 s->ctx->stats.sess_accept_good++;
 824                                 /* s->server=1; */
 825                                 s->handshake_func=ssl3_accept;
 826
 827                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 828                                 }
 829
 830                         ret = 1;
 831                         goto end;
 832                         /* break; */
 833
 834                 default:
 835                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
 836                         ret= -1;
 837                         goto end;
 838                         /* break; */
 839                         }
 840
 841                 if (!s->s3->tmp.reuse_message && !skip)
 842                         {
 843                         if (s->debug)
 844                                 {
 845                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 846                                         goto end;
 847                                 }
 848
 849
 850                         if ((cb != NULL) && (s->state != state))
 851                                 {
 852                                 new_state=s->state;
 853                                 s->state=state;
 854                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
 855                                 s->state=new_state;
 856                                 }
 857                         }
 858                 skip=0;
 859                 }
 860 end:
 861         /* BIO_flush(s->wbio); */
 862
 863         s->in_handshake--;
 864         if (cb != NULL)
 865                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 866         return(ret);
 867         }
 868
 869 int ssl3_send_hello_request(SSL *s)
 870         {
 871         unsigned char *p;
 872
 873         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
 874                 {
 875                 p=(unsigned char *)s->init_buf->data;
 876                 *(p++)=SSL3_MT_HELLO_REQUEST;
 877                 *(p++)=0;
 878                 *(p++)=0;
 879                 *(p++)=0;
 880
 881                 s->state=SSL3_ST_SW_HELLO_REQ_B;
 882                 /* number of bytes to write */
 883                 s->init_num=4;
 884                 s->init_off=0;
 885                 }
 886
 887         /* SSL3_ST_SW_HELLO_REQ_B */
 888         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 889         }
 890
 891 int ssl3_check_client_hello(SSL *s)
 892         {
 893         int ok;
 894         long n;
 895
 896         /* this function is called when we really expect a Certificate message,
 897          * so permit appropriate message length */
 898         n=s->method->ssl_get_message(s,
 899                 SSL3_ST_SR_CERT_A,
 900                 SSL3_ST_SR_CERT_B,
 901                 -1,
 902                 s->max_cert_list,
 903                 &ok);
 904         if (!ok) return((int)n);
 905         s->s3->tmp.reuse_message = 1;
 906         if (s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO)
 907                 {
 908                 /* We only allow the client to restart the handshake once per
 909                  * negotiation. */
 910                 if (s->s3->flags & SSL3_FLAGS_SGC_RESTART_DONE)
 911                         {
 912                         SSLerr(SSL_F_SSL3_CHECK_CLIENT_HELLO, SSL_R_MULTIPLE_SGC_RESTARTS);
 913                         return -1;
 914                         }
 915                 /* Throw away what we have done so far in the current handshake,
 916                  * which will now be aborted. (A full SSL_clear would be too much.) */
 917 #ifndef OPENSSL_NO_DH
 918                 if (s->s3->tmp.dh != NULL)
 919                         {
 920                         DH_free(s->s3->tmp.dh);
 921                         s->s3->tmp.dh = NULL;
 922                         }
 923 #endif
 924 #ifndef OPENSSL_NO_ECDH
 925                 if (s->s3->tmp.ecdh != NULL)
 926                         {
 927                         EC_KEY_free(s->s3->tmp.ecdh);
 928                         s->s3->tmp.ecdh = NULL;
 929                         }
 930 #endif
 931                 s->s3->flags |= SSL3_FLAGS_SGC_RESTART_DONE;
 932                 return 2;
 933                 }
 934         return 1;
 935 }
 936
 937 int ssl3_get_client_hello(SSL *s)
 938         {
 939         int i,j,ok,al=SSL_AD_INTERNAL_ERROR,ret= -1;
 940         unsigned int cookie_len;
 941         long n;
 942         unsigned long id;
 943         unsigned char *p,*d;
 944         SSL_CIPHER *c;
 945 #ifndef OPENSSL_NO_COMP
 946         unsigned char *q;
 947         SSL_COMP *comp=NULL;
 948 #endif
 949         STACK_OF(SSL_CIPHER) *ciphers=NULL;
 950
 951         /* We do this so that we will respond with our native type.
 952          * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
 953          * This down switching should be handled by a different method.
 954          * If we are SSLv3, we will respond with SSLv3, even if prompted with
 955          * TLSv1.
 956          */
 957         if (s->state == SSL3_ST_SR_CLNT_HELLO_A
 958                 )
 959                 {
 960                 s->state=SSL3_ST_SR_CLNT_HELLO_B;
 961                 }
 962         s->first_packet=1;
 963         n=s->method->ssl_get_message(s,
 964                 SSL3_ST_SR_CLNT_HELLO_B,
 965                 SSL3_ST_SR_CLNT_HELLO_C,
 966                 SSL3_MT_CLIENT_HELLO,
 967                 SSL3_RT_MAX_PLAIN_LENGTH,
 968                 &ok);
 969
 970         if (!ok) return((int)n);
 971         s->first_packet=0;
 972         d=p=(unsigned char *)s->init_msg;
 973
 974         /* use version from inside client hello, not from record header
 975          * (may differ: see RFC 2246, Appendix E, second paragraph) */
 976         s->client_version=(((int)p[0])<<8)|(int)p[1];
 977         p+=2;
 978
 979         if ((s->version == DTLS1_VERSION && s->client_version > s->version) ||
 980             (s->version != DTLS1_VERSION && s->client_version < s->version))
 981                 {
 982                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER);
 983                 if ((s->client_version>>8) == SSL3_VERSION_MAJOR)
 984                         {
 985                         /* similar to ssl3_get_record, send alert using remote version number */
 986                         s->version = s->client_version;
 987                         }
 988                 al = SSL_AD_PROTOCOL_VERSION;
 989                 goto f_err;
 990                 }
 991
 992         /* If we require cookies and this ClientHello doesn't
 993          * contain one, just return since we do not want to
 994          * allocate any memory yet. So check cookie length...
 995          */
 996         if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)
 997                 {
 998                 unsigned int session_length, cookie_length;
 999
1000                 session_length = *(p + SSL3_RANDOM_SIZE);
1001                 cookie_length = *(p + SSL3_RANDOM_SIZE + session_length + 1);
1002
1003                 if (cookie_length == 0)
1004                         return 1;
1005                 }
1006
1007         /* load the client random */
1008         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
1009         p+=SSL3_RANDOM_SIZE;
1010
1011         /* get the session-id */
1012         j= *(p++);
1013
1014         s->hit=0;
1015         /* Versions before 0.9.7 always allow clients to resume sessions in renegotiation.
1016          * 0.9.7 and later allow this by default, but optionally ignore resumption requests
1017          * with flag SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION (it's a new flag rather
1018          * than a change to default behavior so that applications relying on this for security
1019          * won't even compile against older library versions).
1020          *
1021          * 1.0.1 and later also have a function SSL_renegotiate_abbreviated() to request
1022          * renegotiation but not a new session (s->new_session remains unset): for servers,
1023          * this essentially just means that the SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
1024          * setting will be ignored.
1025          */
1026         if ((s->new_session && (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION)))
1027                 {
1028                 if (!ssl_get_new_session(s,1))
1029                         goto err;
1030                 }
1031         else
1032                 {
1033                 i=ssl_get_prev_session(s, p, j, d + n);
1034                 if (i == 1)
1035                         { /* previous session */
1036                         s->hit=1;
1037                         }
1038                 else if (i == -1)
1039                         goto err;
1040                 else /* i == 0 */
1041                         {
1042                         if (!ssl_get_new_session(s,1))
1043                                 goto err;
1044                         }
1045                 }
1046
1047         p+=j;
1048
1049         if (s->version == DTLS1_VERSION || s->version == DTLS1_BAD_VER)
1050                 {
1051                 /* cookie stuff */
1052                 cookie_len = *(p++);
1053
1054                 /*
1055                  * The ClientHello may contain a cookie even if the
1056                  * HelloVerify message has not been sent--make sure that it
1057                  * does not cause an overflow.
1058                  */
1059                 if ( cookie_len > sizeof(s->d1->rcvd_cookie))
1060                         {
1061                         /* too much data */
1062                         al = SSL_AD_DECODE_ERROR;
1063                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
1064                         goto f_err;
1065                         }
1066
1067                 /* verify the cookie if appropriate option is set. */
1068                 if ((SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) &&
1069                         cookie_len > 0)
1070                         {
1071                         memcpy(s->d1->rcvd_cookie, p, cookie_len);
1072
1073                         if ( s->ctx->app_verify_cookie_cb != NULL)
1074                                 {
1075                                 if ( s->ctx->app_verify_cookie_cb(s, s->d1->rcvd_cookie,
1076                                         cookie_len) == 0)
1077                                         {
1078                                         al=SSL_AD_HANDSHAKE_FAILURE;
1079                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
1080                                                 SSL_R_COOKIE_MISMATCH);
1081                                         goto f_err;
1082                                         }
1083                                 /* else cookie verification succeeded */
1084                                 }
1085                         else if ( memcmp(s->d1->rcvd_cookie, s->d1->cookie,
1086                                                   s->d1->cookie_len) != 0) /* default verification */
1087                                 {
1088                                         al=SSL_AD_HANDSHAKE_FAILURE;
1089                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
1090                                                 SSL_R_COOKIE_MISMATCH);
1091                                         goto f_err;
1092                                 }
1093
1094                         ret = 2;
1095                         }
1096
1097                 p += cookie_len;
1098                 }
1099
1100         n2s(p,i);
1101         if ((i == 0) && (j != 0))
1102                 {
1103                 /* we need a cipher if we are not resuming a session */
1104                 al=SSL_AD_ILLEGAL_PARAMETER;
1105                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
1106                 goto f_err;
1107                 }
1108         if ((p+i) >= (d+n))
1109                 {
1110                 /* not enough data */
1111                 al=SSL_AD_DECODE_ERROR;
1112                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
1113                 goto f_err;
1114                 }
1115         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
1116                 == NULL))
1117                 {
1118                 goto err;
1119                 }
1120         p+=i;
1121
1122         /* If it is a hit, check that the cipher is in the list */
1123         if ((s->hit) && (i > 0))
1124                 {
1125                 j=0;
1126                 id=s->session->cipher->id;
1127
1128 #ifdef CIPHER_DEBUG
1129                 printf("client sent %d ciphers\n",sk_num(ciphers));
1130 #endif
1131                 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
1132                         {
1133                         c=sk_SSL_CIPHER_value(ciphers,i);
1134 #ifdef CIPHER_DEBUG
1135                         printf("client [%2d of %2d]:%s\n",
1136                                 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
1137 #endif
1138                         if (c->id == id)
1139                                 {
1140                                 j=1;
1141                                 break;
1142                                 }
1143                         }
1144 /* Disabled because it can be used in a ciphersuite downgrade
1145  * attack: CVE-2010-4180.
1146  */
1147 #if 0
1148                 if (j == 0 && (s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
1149                         {
1150                         /* Special case as client bug workaround: the previously used cipher may
1151                          * not be in the current list, the client instead might be trying to
1152                          * continue using a cipher that before wasn't chosen due to server
1153                          * preferences.  We'll have to reject the connection if the cipher is not
1154                          * enabled, though. */
1155                         c = sk_SSL_CIPHER_value(ciphers, 0);
1156                         if (sk_SSL_CIPHER_find(SSL_get_ciphers(s), c) >= 0)
1157                                 {
1158                                 s->session->cipher = c;
1159                                 j = 1;
1160                                 }
1161                         }
1162 #endif
1163                 if (j == 0)
1164                         {
1165                         /* we need to have the cipher in the cipher
1166                          * list if we are asked to reuse it */
1167                         al=SSL_AD_ILLEGAL_PARAMETER;
1168                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
1169                         goto f_err;
1170                         }
1171                 }
1172
1173         /* compression */
1174         i= *(p++);
1175         if ((p+i) > (d+n))
1176                 {
1177                 /* not enough data */
1178                 al=SSL_AD_DECODE_ERROR;
1179                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
1180                 goto f_err;
1181                 }
1182 #ifndef OPENSSL_NO_COMP
1183         q=p;
1184 #endif
1185         for (j=0; j<i; j++)
1186                 {
1187                 if (p[j] == 0) break;
1188                 }
1189
1190         p+=i;
1191         if (j >= i)
1192                 {
1193                 /* no compress */
1194                 al=SSL_AD_DECODE_ERROR;
1195                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
1196                 goto f_err;
1197                 }
1198
1199 #ifndef OPENSSL_NO_TLSEXT
1200         /* TLS extensions*/
1201         if (s->version >= SSL3_VERSION)
1202                 {
1203                 if (!ssl_parse_clienthello_tlsext(s,&p,d,n))
1204                         {
1205                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_PARSE_TLSEXT);
1206                         goto err;
1207                         }
1208                 }
1209
1210         /* Check if we want to use external pre-shared secret for this
1211          * handshake for not reused session only. We need to generate
1212          * server_random before calling tls_session_secret_cb in order to allow
1213          * SessionTicket processing to use it in key derivation. */
1214         {
1215                 unsigned long Time;
1216                 unsigned char *pos;
1217                 Time=(unsigned long)time(NULL);                 /* Time */
1218                 pos=s->s3->server_random;
1219                 l2n(Time,pos);
1220                 if (RAND_pseudo_bytes(pos,SSL3_RANDOM_SIZE-4) <= 0)
1221                         {
1222                         goto f_err;
1223                         }
1224         }
1225
1226         if (!s->hit && s->version >= TLS1_VERSION && s->tls_session_secret_cb)
1227                 {
1228                 SSL_CIPHER *pref_cipher=NULL;
1229
1230                 s->session->master_key_length=sizeof(s->session->master_key);
1231                 if(s->tls_session_secret_cb(s, s->session->master_key, &s->session->master_key_length,
1232                         ciphers, &pref_cipher, s->tls_session_secret_cb_arg))
1233                         {
1234                         s->hit=1;
1235                         s->session->ciphers=ciphers;
1236                         s->session->verify_result=X509_V_OK;
1237
1238                         ciphers=NULL;
1239
1240                         /* check if some cipher was preferred by call back */
1241                         pref_cipher=pref_cipher ? pref_cipher : ssl3_choose_cipher(s, s->session->ciphers, SSL_get_ciphers(s));
1242                         if (pref_cipher == NULL)
1243                                 {
1244                                 al=SSL_AD_HANDSHAKE_FAILURE;
1245                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1246                                 goto f_err;
1247                                 }
1248
1249                         s->session->cipher=pref_cipher;
1250
1251                         if (s->cipher_list)
1252                                 sk_SSL_CIPHER_free(s->cipher_list);
1253
1254                         if (s->cipher_list_by_id)
1255                                 sk_SSL_CIPHER_free(s->cipher_list_by_id);
1256
1257                         s->cipher_list = sk_SSL_CIPHER_dup(s->session->ciphers);
1258                         s->cipher_list_by_id = sk_SSL_CIPHER_dup(s->session->ciphers);
1259                         }
1260                 }
1261 #endif
1262
1263         /* Worst case, we will use the NULL compression, but if we have other
1264          * options, we will now look for them.  We have i-1 compression
1265          * algorithms from the client, starting at q. */
1266         s->s3->tmp.new_compression=NULL;
1267 #ifndef OPENSSL_NO_COMP
1268         /* This only happens if we have a cache hit */
1269         if (s->session->compress_meth != 0)
1270                 {
1271                 int m, comp_id = s->session->compress_meth;
1272                 /* Perform sanity checks on resumed compression algorithm */
1273                 /* Can't disable compression */
1274                 if (s->options & SSL_OP_NO_COMPRESSION)
1275                         {
1276                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1277                         goto f_err;
1278                         }
1279                 /* Look for resumed compression method */
1280                 for (m = 0; m < sk_SSL_COMP_num(s->ctx->comp_methods); m++)
1281                         {
1282                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1283                         if (comp_id == comp->id)
1284                                 {
1285                                 s->s3->tmp.new_compression=comp;
1286                                 break;
1287                                 }
1288                         }
1289                 if (s->s3->tmp.new_compression == NULL)
1290                         {
1291                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INVALID_COMPRESSION_ALGORITHM);
1292                         goto f_err;
1293                         }
1294                 /* Look for resumed method in compression list */
1295                 for (m = 0; m < i; m++)
1296                         {
1297                         if (q[m] == comp_id)
1298                                 break;
1299                         }
1300                 if (m >= i)
1301                         {
1302                         al=SSL_AD_ILLEGAL_PARAMETER;
1303                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_COMPRESSSION_ALGORITHM_MISSING);
1304                         goto f_err;
1305                         }
1306                 }
1307         else if (s->hit)
1308                 comp = NULL;
1309         else if (!(s->options & SSL_OP_NO_COMPRESSION) && s->ctx->comp_methods)
1310                 { /* See if we have a match */
1311                 int m,nn,o,v,done=0;
1312
1313                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
1314                 for (m=0; m<nn; m++)
1315                         {
1316                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1317                         v=comp->id;
1318                         for (o=0; o<i; o++)
1319                                 {
1320                                 if (v == q[o])
1321                                         {
1322                                         done=1;
1323                                         break;
1324                                         }
1325                                 }
1326                         if (done) break;
1327                         }
1328                 if (done)
1329                         s->s3->tmp.new_compression=comp;
1330                 else
1331                         comp=NULL;
1332                 }
1333 #else
1334         /* If compression is disabled we'd better not try to resume a session
1335          * using compression.
1336          */
1337         if (s->session->compress_meth != 0)
1338                 {
1339                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1340                 goto f_err;
1341                 }
1342 #endif
1343
1344         /* Given s->session->ciphers and SSL_get_ciphers, we must
1345          * pick a cipher */
1346
1347         if (!s->hit)
1348                 {
1349 #ifdef OPENSSL_NO_COMP
1350                 s->session->compress_meth=0;
1351 #else
1352                 s->session->compress_meth=(comp == NULL)?0:comp->id;
1353 #endif
1354                 if (s->session->ciphers != NULL)
1355                         sk_SSL_CIPHER_free(s->session->ciphers);
1356                 s->session->ciphers=ciphers;
1357                 if (ciphers == NULL)
1358                         {
1359                         al=SSL_AD_ILLEGAL_PARAMETER;
1360                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
1361                         goto f_err;
1362                         }
1363                 ciphers=NULL;
1364                 /* Let cert callback update server certificates if required */
1365                 if (s->cert->cert_cb
1366                         && s->cert->cert_cb(s, s->cert->cert_cb_arg) <= 0)
1367                         {
1368                         al=SSL_AD_INTERNAL_ERROR;
1369                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_CERT_CB_ERROR);
1370                         goto f_err;
1371                         }
1372                 c=ssl3_choose_cipher(s,s->session->ciphers,
1373                                      SSL_get_ciphers(s));
1374
1375                 if (c == NULL)
1376                         {
1377                         al=SSL_AD_HANDSHAKE_FAILURE;
1378                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1379                         goto f_err;
1380                         }
1381                 s->s3->tmp.new_cipher=c;
1382                 /* check whether we should disable session resumption */
1383                 if (s->not_resumable_session_cb != NULL)
1384                         s->session->not_resumable=s->not_resumable_session_cb(s,
1385                                 ((c->algorithm_mkey & (SSL_kEDH | SSL_kEECDH)) != 0));
1386                 if (s->session->not_resumable)
1387                         /* do not send a session ticket */
1388                         s->tlsext_ticket_expected = 0;
1389                 }
1390         else
1391                 {
1392                 /* Session-id reuse */
1393 #ifdef REUSE_CIPHER_BUG
1394                 STACK_OF(SSL_CIPHER) *sk;
1395                 SSL_CIPHER *nc=NULL;
1396                 SSL_CIPHER *ec=NULL;
1397
1398                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
1399                         {
1400                         sk=s->session->ciphers;
1401                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
1402                                 {
1403                                 c=sk_SSL_CIPHER_value(sk,i);
1404                                 if (c->algorithm_enc & SSL_eNULL)
1405                                         nc=c;
1406                                 if (SSL_C_IS_EXPORT(c))
1407                                         ec=c;
1408                                 }
1409                         if (nc != NULL)
1410                                 s->s3->tmp.new_cipher=nc;
1411                         else if (ec != NULL)
1412                                 s->s3->tmp.new_cipher=ec;
1413                         else
1414                                 s->s3->tmp.new_cipher=s->session->cipher;
1415                         }
1416                 else
1417 #endif
1418                 s->s3->tmp.new_cipher=s->session->cipher;
1419                 }
1420
1421         if (TLS1_get_version(s) < TLS1_2_VERSION || !(s->verify_mode & SSL_VERIFY_PEER))
1422                 {
1423                 if (!ssl3_digest_cached_records(s))
1424                         goto f_err;
1425                 }
1426
1427         /* we now have the following setup.
1428          * client_random
1429          * cipher_list          - our prefered list of ciphers
1430          * ciphers              - the clients prefered list of ciphers
1431          * compression          - basically ignored right now
1432          * ssl version is set   - sslv3
1433          * s->session           - The ssl session has been setup.
1434          * s->hit               - session reuse flag
1435          * s->tmp.new_cipher    - the new cipher to use.
1436          */
1437
1438         /* Handles TLS extensions that we couldn't check earlier */
1439         if (s->version >= SSL3_VERSION)
1440                 {
1441                 if (ssl_check_clienthello_tlsext_late(s) <= 0)
1442                         {
1443                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT);
1444                         goto err;
1445                         }
1446                 }
1447
1448         if (ret < 0) ret=1;
1449         if (0)
1450                 {
1451 f_err:
1452                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1453                 }
1454 err:
1455         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
1456         return(ret);
1457         }
1458
1459 int ssl3_send_server_hello(SSL *s)
1460         {
1461         unsigned char *buf;
1462         unsigned char *p,*d;
1463         int i,sl;
1464         unsigned long l;
1465 #ifdef OPENSSL_NO_TLSEXT
1466         unsigned long Time;
1467 #endif
1468
1469         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
1470                 {
1471                 buf=(unsigned char *)s->init_buf->data;
1472 #ifdef OPENSSL_NO_TLSEXT
1473                 p=s->s3->server_random;
1474                 /* Generate server_random if it was not needed previously */
1475                 Time=(unsigned long)time(NULL);                 /* Time */
1476                 l2n(Time,p);
1477                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
1478                         return -1;
1479 #endif
1480                 /* Do the message type and length last */
1481                 d=p= &(buf[4]);
1482
1483                 *(p++)=s->version>>8;
1484                 *(p++)=s->version&0xff;
1485
1486                 /* Random stuff */
1487                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
1488                 p+=SSL3_RANDOM_SIZE;
1489
1490                 /* There are several cases for the session ID to send
1491                  * back in the server hello:
1492                  * - For session reuse from the session cache,
1493                  *   we send back the old session ID.
1494                  * - If stateless session reuse (using a session ticket)
1495                  *   is successful, we send back the client's "session ID"
1496                  *   (which doesn't actually identify the session).
1497                  * - If it is a new session, we send back the new
1498                  *   session ID.
1499                  * - However, if we want the new session to be single-use,
1500                  *   we send back a 0-length session ID.
1501                  * s->hit is non-zero in either case of session reuse,
1502                  * so the following won't overwrite an ID that we're supposed
1503                  * to send back.
1504                  */
1505                 if (s->session->not_resumable ||
1506                         (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)
1507                                 && !s->hit))
1508                         s->session->session_id_length=0;
1509
1510                 sl=s->session->session_id_length;
1511                 if (sl > (int)sizeof(s->session->session_id))
1512                         {
1513                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1514                         return -1;
1515                         }
1516                 *(p++)=sl;
1517                 memcpy(p,s->session->session_id,sl);
1518                 p+=sl;
1519
1520                 /* put the cipher */
1521                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
1522                 p+=i;
1523
1524                 /* put the compression method */
1525 #ifdef OPENSSL_NO_COMP
1526                         *(p++)=0;
1527 #else
1528                 if (s->s3->tmp.new_compression == NULL)
1529                         *(p++)=0;
1530                 else
1531                         *(p++)=s->s3->tmp.new_compression->id;
1532 #endif
1533 #ifndef OPENSSL_NO_TLSEXT
1534                 if (ssl_prepare_serverhello_tlsext(s) <= 0)
1535                         {
1536                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
1537                         return -1;
1538                         }
1539                 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
1540                         {
1541                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
1542                         return -1;
1543                         }
1544 #endif
1545                 /* do the header */
1546                 l=(p-d);
1547                 d=buf;
1548                 *(d++)=SSL3_MT_SERVER_HELLO;
1549                 l2n3(l,d);
1550
1551                 s->state=SSL3_ST_SW_SRVR_HELLO_B;
1552                 /* number of bytes to write */
1553                 s->init_num=p-buf;
1554                 s->init_off=0;
1555                 }
1556
1557         /* SSL3_ST_SW_SRVR_HELLO_B */
1558         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1559         }
1560
1561 int ssl3_send_server_done(SSL *s)
1562         {
1563         unsigned char *p;
1564
1565         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1566                 {
1567                 p=(unsigned char *)s->init_buf->data;
1568
1569                 /* do the header */
1570                 *(p++)=SSL3_MT_SERVER_DONE;
1571                 *(p++)=0;
1572                 *(p++)=0;
1573                 *(p++)=0;
1574
1575                 s->state=SSL3_ST_SW_SRVR_DONE_B;
1576                 /* number of bytes to write */
1577                 s->init_num=4;
1578                 s->init_off=0;
1579                 }
1580
1581         /* SSL3_ST_SW_SRVR_DONE_B */
1582         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1583         }
1584
1585 int ssl3_send_server_key_exchange(SSL *s)
1586         {
1587 #ifndef OPENSSL_NO_RSA
1588         unsigned char *q;
1589         int j,num;
1590         RSA *rsa;
1591         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1592         unsigned int u;
1593 #endif
1594 #ifndef OPENSSL_NO_DH
1595         DH *dh=NULL,*dhp;
1596 #endif
1597 #ifndef OPENSSL_NO_ECDH
1598         EC_KEY *ecdh=NULL, *ecdhp;
1599         unsigned char *encodedPoint = NULL;
1600         int encodedlen = 0;
1601         int curve_id = 0;
1602         BN_CTX *bn_ctx = NULL;
1603 #endif
1604         EVP_PKEY *pkey;
1605         const EVP_MD *md = NULL;
1606         unsigned char *p,*d;
1607         int al,i;
1608         unsigned long type;
1609         int n;
1610         CERT *cert;
1611         BIGNUM *r[4];
1612         int nr[4],kn;
1613         BUF_MEM *buf;
1614         EVP_MD_CTX md_ctx;
1615
1616         EVP_MD_CTX_init(&md_ctx);
1617         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1618                 {
1619                 type=s->s3->tmp.new_cipher->algorithm_mkey;
1620                 cert=s->cert;
1621
1622                 buf=s->init_buf;
1623
1624                 r[0]=r[1]=r[2]=r[3]=NULL;
1625                 n=0;
1626 #ifndef OPENSSL_NO_RSA
1627                 if (type & SSL_kRSA)
1628                         {
1629                         rsa=cert->rsa_tmp;
1630                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1631                                 {
1632                                 rsa=s->cert->rsa_tmp_cb(s,
1633                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1634                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1635                                 if(rsa == NULL)
1636                                 {
1637                                         al=SSL_AD_HANDSHAKE_FAILURE;
1638                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1639                                         goto f_err;
1640                                 }
1641                                 RSA_up_ref(rsa);
1642                                 cert->rsa_tmp=rsa;
1643                                 }
1644                         if (rsa == NULL)
1645                                 {
1646                                 al=SSL_AD_HANDSHAKE_FAILURE;
1647                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1648                                 goto f_err;
1649                                 }
1650                         r[0]=rsa->n;
1651                         r[1]=rsa->e;
1652                         s->s3->tmp.use_rsa_tmp=1;
1653                         }
1654                 else
1655 #endif
1656 #ifndef OPENSSL_NO_DH
1657                         if (type & SSL_kEDH)
1658                         {
1659                         dhp=cert->dh_tmp;
1660                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1661                                 dhp=s->cert->dh_tmp_cb(s,
1662                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1663                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1664                         if (dhp == NULL)
1665                                 {
1666                                 al=SSL_AD_HANDSHAKE_FAILURE;
1667                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1668                                 goto f_err;
1669                                 }
1670
1671                         if (s->s3->tmp.dh != NULL)
1672                                 {
1673                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1674                                 goto err;
1675                                 }
1676
1677                         if ((dh=DHparams_dup(dhp)) == NULL)
1678                                 {
1679                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1680                                 goto err;
1681                                 }
1682
1683                         s->s3->tmp.dh=dh;
1684                         if ((dhp->pub_key == NULL ||
1685                              dhp->priv_key == NULL ||
1686                              (s->options & SSL_OP_SINGLE_DH_USE)))
1687                                 {
1688                                 if(!DH_generate_key(dh))
1689                                     {
1690                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1691                                            ERR_R_DH_LIB);
1692                                     goto err;
1693                                     }
1694                                 }
1695                         else
1696                                 {
1697                                 dh->pub_key=BN_dup(dhp->pub_key);
1698                                 dh->priv_key=BN_dup(dhp->priv_key);
1699                                 if ((dh->pub_key == NULL) ||
1700                                         (dh->priv_key == NULL))
1701                                         {
1702                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1703                                         goto err;
1704                                         }
1705                                 }
1706                         r[0]=dh->p;
1707                         r[1]=dh->g;
1708                         r[2]=dh->pub_key;
1709                         }
1710                 else
1711 #endif
1712 #ifndef OPENSSL_NO_ECDH
1713                         if (type & SSL_kEECDH)
1714                         {
1715                         const EC_GROUP *group;
1716
1717                         ecdhp=cert->ecdh_tmp;
1718                         if (s->cert->ecdh_tmp_auto)
1719                                 {
1720                                 /* Get NID of appropriate shared curve */
1721                                 int nid = tls1_shared_curve(s, -2);
1722                                 if (nid != NID_undef)
1723                                         ecdhp = EC_KEY_new_by_curve_name(nid);
1724                                 }
1725                         else if ((ecdhp == NULL) && s->cert->ecdh_tmp_cb)
1726                                 {
1727                                 ecdhp=s->cert->ecdh_tmp_cb(s,
1728                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1729                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1730                                 }
1731                         if (ecdhp == NULL)
1732                                 {
1733                                 al=SSL_AD_HANDSHAKE_FAILURE;
1734                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1735                                 goto f_err;
1736                                 }
1737
1738                         if (s->s3->tmp.ecdh != NULL)
1739                                 {
1740                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1741                                 goto err;
1742                                 }
1743
1744                         /* Duplicate the ECDH structure. */
1745                         if (ecdhp == NULL)
1746                                 {
1747                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1748                                 goto err;
1749                                 }
1750                         if (s->cert->ecdh_tmp_auto)
1751                                 ecdh = ecdhp;
1752                         else if ((ecdh = EC_KEY_dup(ecdhp)) == NULL)
1753                                 {
1754                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1755                                 goto err;
1756                                 }
1757
1758                         s->s3->tmp.ecdh=ecdh;
1759                         if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1760                             (EC_KEY_get0_private_key(ecdh) == NULL) ||
1761                             (s->options & SSL_OP_SINGLE_ECDH_USE))
1762                                 {
1763                                 if(!EC_KEY_generate_key(ecdh))
1764                                     {
1765                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1766                                     goto err;
1767                                     }
1768                                 }
1769
1770                         if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1771                             (EC_KEY_get0_public_key(ecdh)  == NULL) ||
1772                             (EC_KEY_get0_private_key(ecdh) == NULL))
1773                                 {
1774                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1775                                 goto err;
1776                                 }
1777
1778                         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1779                             (EC_GROUP_get_degree(group) > 163))
1780                                 {
1781                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1782                                 goto err;
1783                                 }
1784
1785                         /* XXX: For now, we only support ephemeral ECDH
1786                          * keys over named (not generic) curves. For
1787                          * supported named curves, curve_id is non-zero.
1788                          */
1789                         if ((curve_id =
1790                             tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1791                             == 0)
1792                                 {
1793                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1794                                 goto err;
1795                                 }
1796
1797                         /* Encode the public key.
1798                          * First check the size of encoding and
1799                          * allocate memory accordingly.
1800                          */
1801                         encodedlen = EC_POINT_point2oct(group,
1802                             EC_KEY_get0_public_key(ecdh),
1803                             POINT_CONVERSION_UNCOMPRESSED,
1804                             NULL, 0, NULL);
1805
1806                         encodedPoint = (unsigned char *)
1807                             OPENSSL_malloc(encodedlen*sizeof(unsigned char));
1808                         bn_ctx = BN_CTX_new();
1809                         if ((encodedPoint == NULL) || (bn_ctx == NULL))
1810                                 {
1811                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1812                                 goto err;
1813                                 }
1814
1815
1816                         encodedlen = EC_POINT_point2oct(group,
1817                             EC_KEY_get0_public_key(ecdh),
1818                             POINT_CONVERSION_UNCOMPRESSED,
1819                             encodedPoint, encodedlen, bn_ctx);
1820
1821                         if (encodedlen == 0)
1822                                 {
1823                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1824                                 goto err;
1825                                 }
1826
1827                         BN_CTX_free(bn_ctx);  bn_ctx=NULL;
1828
1829                         /* XXX: For now, we only support named (not
1830                          * generic) curves in ECDH ephemeral key exchanges.
1831                          * In this situation, we need four additional bytes
1832                          * to encode the entire ServerECDHParams
1833                          * structure.
1834                          */
1835                         n = 4 + encodedlen;
1836
1837                         /* We'll generate the serverKeyExchange message
1838                          * explicitly so we can set these to NULLs
1839                          */
1840                         r[0]=NULL;
1841                         r[1]=NULL;
1842                         r[2]=NULL;
1843                         r[3]=NULL;
1844                         }
1845                 else
1846 #endif /* !OPENSSL_NO_ECDH */
1847 #ifndef OPENSSL_NO_PSK
1848                         if (type & SSL_kPSK)
1849                                 {
1850                                 /* reserve size for record length and PSK identity hint*/
1851                                 n+=2+strlen(s->ctx->psk_identity_hint);
1852                                 }
1853                         else
1854 #endif /* !OPENSSL_NO_PSK */
1855 #ifndef OPENSSL_NO_SRP
1856                 if (type & SSL_kSRP)
1857                         {
1858                         if ((s->srp_ctx.N == NULL) ||
1859                                 (s->srp_ctx.g == NULL) ||
1860                                 (s->srp_ctx.s == NULL) ||
1861                                 (s->srp_ctx.B == NULL))
1862                                 {
1863                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_SRP_PARAM);
1864                                 goto err;
1865                                 }
1866                         r[0]=s->srp_ctx.N;
1867                         r[1]=s->srp_ctx.g;
1868                         r[2]=s->srp_ctx.s;
1869                         r[3]=s->srp_ctx.B;
1870                         }
1871                 else
1872 #endif
1873                         {
1874                         al=SSL_AD_HANDSHAKE_FAILURE;
1875                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1876                         goto f_err;
1877                         }
1878                 for (i=0; r[i] != NULL && i<4; i++)
1879                         {
1880                         nr[i]=BN_num_bytes(r[i]);
1881 #ifndef OPENSSL_NO_SRP
1882                         if ((i == 2) && (type & SSL_kSRP))
1883                                 n+=1+nr[i];
1884                         else
1885 #endif
1886                         n+=2+nr[i];
1887                         }
1888
1889                 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1890                         && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
1891                         {
1892                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher,&md))
1893                                 == NULL)
1894                                 {
1895                                 al=SSL_AD_DECODE_ERROR;
1896                                 goto f_err;
1897                                 }
1898                         kn=EVP_PKEY_size(pkey);
1899                         }
1900                 else
1901                         {
1902                         pkey=NULL;
1903                         kn=0;
1904                         }
1905
1906                 if (!BUF_MEM_grow_clean(buf,n+4+kn))
1907                         {
1908                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1909                         goto err;
1910                         }
1911                 d=(unsigned char *)s->init_buf->data;
1912                 p= &(d[4]);
1913
1914                 for (i=0; r[i] != NULL && i<4; i++)
1915                         {
1916 #ifndef OPENSSL_NO_SRP
1917                         if ((i == 2) && (type & SSL_kSRP))
1918                                 {
1919                                 *p = nr[i];
1920                                 p++;
1921                                 }
1922                         else
1923 #endif
1924                         s2n(nr[i],p);
1925                         BN_bn2bin(r[i],p);
1926                         p+=nr[i];
1927                         }
1928
1929 #ifndef OPENSSL_NO_ECDH
1930                 if (type & SSL_kEECDH)
1931                         {
1932                         /* XXX: For now, we only support named (not generic) curves.
1933                          * In this situation, the serverKeyExchange message has:
1934                          * [1 byte CurveType], [2 byte CurveName]
1935                          * [1 byte length of encoded point], followed by
1936                          * the actual encoded point itself
1937                          */
1938                         *p = NAMED_CURVE_TYPE;
1939                         p += 1;
1940                         *p = 0;
1941                         p += 1;
1942                         *p = curve_id;
1943                         p += 1;
1944                         *p = encodedlen;
1945                         p += 1;
1946                         memcpy((unsigned char*)p,
1947                             (unsigned char *)encodedPoint,
1948                             encodedlen);
1949                         OPENSSL_free(encodedPoint);
1950                         encodedPoint = NULL;
1951                         p += encodedlen;
1952                         }
1953 #endif
1954
1955 #ifndef OPENSSL_NO_PSK
1956                 if (type & SSL_kPSK)
1957                         {
1958                         /* copy PSK identity hint */
1959                         s2n(strlen(s->ctx->psk_identity_hint), p);
1960                         strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
1961                         p+=strlen(s->ctx->psk_identity_hint);
1962                         }
1963 #endif
1964
1965                 /* not anonymous */
1966                 if (pkey != NULL)
1967                         {
1968                         /* n is the length of the params, they start at &(d[4])
1969                          * and p points to the space at the end. */
1970 #ifndef OPENSSL_NO_RSA
1971                         if (pkey->type == EVP_PKEY_RSA
1972                                         && TLS1_get_version(s) < TLS1_2_VERSION)
1973                                 {
1974                                 q=md_buf;
1975                                 j=0;
1976                                 for (num=2; num > 0; num--)
1977                                         {
1978                                         EVP_MD_CTX_set_flags(&md_ctx,
1979                                                 EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1980                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1981                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1982                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1983                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1984                                         EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1985                                         EVP_DigestFinal_ex(&md_ctx,q,
1986                                                 (unsigned int *)&i);
1987                                         q+=i;
1988                                         j+=i;
1989                                         }
1990                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1991                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1992                                         {
1993                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1994                                         goto err;
1995                                         }
1996                                 s2n(u,p);
1997                                 n+=u+2;
1998                                 }
1999                         else
2000 #endif
2001                         if (md)
2002                                 {
2003                                 /* For TLS1.2 and later send signature
2004                                  * algorithm */
2005                                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
2006                                         {
2007                                         if (!tls12_get_sigandhash(p, pkey, md))
2008                                                 {
2009                                                 /* Should never happen */
2010                                                 al=SSL_AD_INTERNAL_ERROR;
2011                                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2012                                                 goto f_err;
2013                                                 }
2014                                         p+=2;
2015                                         }
2016 #ifdef SSL_DEBUG
2017                                 fprintf(stderr, "Using hash %s\n",
2018                                                         EVP_MD_name(md));
2019 #endif
2020                                 EVP_SignInit_ex(&md_ctx, md, NULL);
2021                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
2022                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
2023                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
2024                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
2025                                         (unsigned int *)&i,pkey))
2026                                         {
2027                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_EVP);
2028                                         goto err;
2029                                         }
2030                                 s2n(i,p);
2031                                 n+=i+2;
2032                                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
2033                                         n+= 2;
2034                                 }
2035                         else
2036                                 {
2037                                 /* Is this error check actually needed? */
2038                                 al=SSL_AD_HANDSHAKE_FAILURE;
2039                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
2040                                 goto f_err;
2041                                 }
2042                         }
2043
2044                 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
2045                 l2n3(n,d);
2046
2047                 /* we should now have things packed up, so lets send
2048                  * it off */
2049                 s->init_num=n+4;
2050                 s->init_off=0;
2051                 }
2052
2053         s->state = SSL3_ST_SW_KEY_EXCH_B;
2054         EVP_MD_CTX_cleanup(&md_ctx);
2055         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2056 f_err:
2057         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2058 err:
2059 #ifndef OPENSSL_NO_ECDH
2060         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2061         BN_CTX_free(bn_ctx);
2062 #endif
2063         EVP_MD_CTX_cleanup(&md_ctx);
2064         return(-1);
2065         }
2066
2067 int ssl3_send_certificate_request(SSL *s)
2068         {
2069         unsigned char *p,*d;
2070         int i,j,nl,off,n;
2071         STACK_OF(X509_NAME) *sk=NULL;
2072         X509_NAME *name;
2073         BUF_MEM *buf;
2074
2075         if (s->state == SSL3_ST_SW_CERT_REQ_A)
2076                 {
2077                 buf=s->init_buf;
2078
2079                 d=p=(unsigned char *)&(buf->data[4]);
2080
2081                 /* get the list of acceptable cert types */
2082                 p++;
2083                 n=ssl3_get_req_cert_type(s,p);
2084                 d[0]=n;
2085                 p+=n;
2086                 n++;
2087
2088                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
2089                         {
2090                         const unsigned char *psigs;
2091                         nl = tls12_get_psigalgs(s, &psigs);
2092                         s2n(nl, p);
2093                         memcpy(p, psigs, nl);
2094                         p += nl;
2095                         n += nl + 2;
2096                         }
2097
2098                 off=n;
2099                 p+=2;
2100                 n+=2;
2101
2102                 sk=SSL_get_client_CA_list(s);
2103                 nl=0;
2104                 if (sk != NULL)
2105                         {
2106                         for (i=0; i<sk_X509_NAME_num(sk); i++)
2107                                 {
2108                                 name=sk_X509_NAME_value(sk,i);
2109                                 j=i2d_X509_NAME(name,NULL);
2110                                 if (!BUF_MEM_grow_clean(buf,4+n+j+2))
2111                                         {
2112                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
2113                                         goto err;
2114                                         }
2115                                 p=(unsigned char *)&(buf->data[4+n]);
2116                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
2117                                         {
2118                                         s2n(j,p);
2119                                         i2d_X509_NAME(name,&p);
2120                                         n+=2+j;
2121                                         nl+=2+j;
2122                                         }
2123                                 else
2124                                         {
2125                                         d=p;
2126                                         i2d_X509_NAME(name,&p);
2127                                         j-=2; s2n(j,d); j+=2;
2128                                         n+=j;
2129                                         nl+=j;
2130                                         }
2131                                 }
2132                         }
2133                 /* else no CA names */
2134                 p=(unsigned char *)&(buf->data[4+off]);
2135                 s2n(nl,p);
2136
2137                 d=(unsigned char *)buf->data;
2138                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
2139                 l2n3(n,d);
2140
2141                 /* we should now have things packed up, so lets send
2142                  * it off */
2143
2144                 s->init_num=n+4;
2145                 s->init_off=0;
2146 #ifdef NETSCAPE_HANG_BUG
2147                 p=(unsigned char *)s->init_buf->data + s->init_num;
2148
2149                 /* do the header */
2150                 *(p++)=SSL3_MT_SERVER_DONE;
2151                 *(p++)=0;
2152                 *(p++)=0;
2153                 *(p++)=0;
2154                 s->init_num += 4;
2155 #endif
2156
2157                 s->state = SSL3_ST_SW_CERT_REQ_B;
2158                 }
2159
2160         /* SSL3_ST_SW_CERT_REQ_B */
2161         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2162 err:
2163         return(-1);
2164         }
2165
2166 int ssl3_get_client_key_exchange(SSL *s)
2167         {
2168         int i,al,ok;
2169         long n;
2170         unsigned long alg_k;
2171         unsigned char *p;
2172 #ifndef OPENSSL_NO_RSA
2173         RSA *rsa=NULL;
2174         EVP_PKEY *pkey=NULL;
2175 #endif
2176 #ifndef OPENSSL_NO_DH
2177         BIGNUM *pub=NULL;
2178         DH *dh_srvr, *dh_clnt = NULL;
2179 #endif
2180 #ifndef OPENSSL_NO_KRB5
2181         KSSL_ERR kssl_err;
2182 #endif /* OPENSSL_NO_KRB5 */
2183
2184 #ifndef OPENSSL_NO_ECDH
2185         EC_KEY *srvr_ecdh = NULL;
2186         EVP_PKEY *clnt_pub_pkey = NULL;
2187         EC_POINT *clnt_ecpoint = NULL;
2188         BN_CTX *bn_ctx = NULL;
2189 #endif
2190
2191         n=s->method->ssl_get_message(s,
2192                 SSL3_ST_SR_KEY_EXCH_A,
2193                 SSL3_ST_SR_KEY_EXCH_B,
2194                 SSL3_MT_CLIENT_KEY_EXCHANGE,
2195                 2048, /* ??? */
2196                 &ok);
2197
2198         if (!ok) return((int)n);
2199         p=(unsigned char *)s->init_msg;
2200
2201         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2202
2203 #ifndef OPENSSL_NO_RSA
2204         if (alg_k & SSL_kRSA)
2205                 {
2206                 /* FIX THIS UP EAY EAY EAY EAY */
2207                 if (s->s3->tmp.use_rsa_tmp)
2208                         {
2209                         if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
2210                                 rsa=s->cert->rsa_tmp;
2211                         /* Don't do a callback because rsa_tmp should
2212                          * be sent already */
2213                         if (rsa == NULL)
2214                                 {
2215                                 al=SSL_AD_HANDSHAKE_FAILURE;
2216                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
2217                                 goto f_err;
2218
2219                                 }
2220                         }
2221                 else
2222                         {
2223                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
2224                         if (    (pkey == NULL) ||
2225                                 (pkey->type != EVP_PKEY_RSA) ||
2226                                 (pkey->pkey.rsa == NULL))
2227                                 {
2228                                 al=SSL_AD_HANDSHAKE_FAILURE;
2229                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
2230                                 goto f_err;
2231                                 }
2232                         rsa=pkey->pkey.rsa;
2233                         }
2234
2235                 /* TLS and [incidentally] DTLS{0xFEFF} */
2236                 if (s->version > SSL3_VERSION && s->version != DTLS1_BAD_VER)
2237                         {
2238                         n2s(p,i);
2239                         if (n != i+2)
2240                                 {
2241                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
2242                                         {
2243                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
2244                                         goto err;
2245                                         }
2246                                 else
2247                                         p-=2;
2248                                 }
2249                         else
2250                                 n=i;
2251                         }
2252
2253                 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
2254
2255                 al = -1;
2256
2257                 if (i != SSL_MAX_MASTER_KEY_LENGTH)
2258                         {
2259                         al=SSL_AD_DECODE_ERROR;
2260                         /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT); */
2261                         }
2262
2263                 if ((al == -1) && !((p[0] == (s->client_version>>8)) && (p[1] == (s->client_version & 0xff))))
2264                         {
2265                         /* The premaster secret must contain the same version number as the
2266                          * ClientHello to detect version rollback attacks (strangely, the
2267                          * protocol does not offer such protection for DH ciphersuites).
2268                          * However, buggy clients exist that send the negotiated protocol
2269                          * version instead if the server does not support the requested
2270                          * protocol version.
2271                          * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
2272                         if (!((s->options & SSL_OP_TLS_ROLLBACK_BUG) &&
2273                                 (p[0] == (s->version>>8)) && (p[1] == (s->version & 0xff))))
2274                                 {
2275                                 al=SSL_AD_DECODE_ERROR;
2276                                 /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER); */
2277
2278                                 /* The Klima-Pokorny-Rosa extension of Bleichenbacher's attack
2279                                  * (http://eprint.iacr.org/2003/052/) exploits the version
2280                                  * number check as a "bad version oracle" -- an alert would
2281                                  * reveal that the plaintext corresponding to some ciphertext
2282                                  * made up by the adversary is properly formatted except
2283                                  * that the version number is wrong.  To avoid such attacks,
2284                                  * we should treat this just like any other decryption error. */
2285                                 }
2286                         }
2287
2288                 if (al != -1)
2289                         {
2290                         /* Some decryption failure -- use random value instead as countermeasure
2291                          * against Bleichenbacher's attack on PKCS #1 v1.5 RSA padding
2292                          * (see RFC 2246, section 7.4.7.1). */
2293                         ERR_clear_error();
2294                         i = SSL_MAX_MASTER_KEY_LENGTH;
2295                         p[0] = s->client_version >> 8;
2296                         p[1] = s->client_version & 0xff;
2297                         if (RAND_pseudo_bytes(p+2, i-2) <= 0) /* should be RAND_bytes, but we cannot work around a failure */
2298                                 goto err;
2299                         }
2300
2301                 s->session->master_key_length=
2302                         s->method->ssl3_enc->generate_master_secret(s,
2303                                 s->session->master_key,
2304                                 p,i);
2305                 OPENSSL_cleanse(p,i);
2306                 }
2307         else
2308 #endif
2309 #ifndef OPENSSL_NO_DH
2310                 if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2311                 {
2312                 int idx = -1;
2313                 EVP_PKEY *skey = NULL;
2314                 if (n)
2315                         n2s(p,i);
2316                 else
2317                         i = 0;
2318                 if (n && n != i+2)
2319                         {
2320                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
2321                                 {
2322                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
2323                                 goto err;
2324                                 }
2325                         else
2326                                 {
2327                                 p-=2;
2328                                 i=(int)n;
2329                                 }
2330                         }
2331                 if (alg_k & SSL_kDHr)
2332                         idx = SSL_PKEY_DH_RSA;
2333                 else if (alg_k & SSL_kDHd)
2334                         idx = SSL_PKEY_DH_DSA;
2335                 if (idx >= 0)
2336                         {
2337                         skey = s->cert->pkeys[idx].privatekey;
2338                         if ((skey == NULL) ||
2339                                 (skey->type != EVP_PKEY_DH) ||
2340                                 (skey->pkey.dh == NULL))
2341                                 {
2342                                 al=SSL_AD_HANDSHAKE_FAILURE;
2343                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
2344                                 goto f_err;
2345                                 }
2346                         dh_srvr = skey->pkey.dh;
2347                         }
2348                 else if (s->s3->tmp.dh == NULL)
2349                         {
2350                         al=SSL_AD_HANDSHAKE_FAILURE;
2351                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
2352                         goto f_err;
2353                         }
2354                 else
2355                         dh_srvr=s->s3->tmp.dh;
2356
2357                 if (n == 0L)
2358                         {
2359                         /* Get pubkey from cert */
2360                         EVP_PKEY *clkey=X509_get_pubkey(s->session->peer);
2361                         if (clkey)
2362                                 {
2363                                 if (EVP_PKEY_cmp_parameters(clkey, skey) == 1)
2364                                         dh_clnt = EVP_PKEY_get1_DH(clkey);
2365                                 }
2366                         if (dh_clnt == NULL)
2367                                 {
2368                                 al=SSL_AD_HANDSHAKE_FAILURE;
2369                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
2370                                 goto f_err;
2371                                 }
2372                         EVP_PKEY_free(clkey);
2373                         pub = dh_clnt->pub_key;
2374                         }
2375                 else
2376                         pub=BN_bin2bn(p,i,NULL);
2377                 if (pub == NULL)
2378                         {
2379                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
2380                         goto err;
2381                         }
2382
2383                 i=DH_compute_key(p,pub,dh_srvr);
2384
2385                 if (i <= 0)
2386                         {
2387                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2388                         BN_clear_free(pub);
2389                         goto err;
2390                         }
2391
2392                 DH_free(s->s3->tmp.dh);
2393                 s->s3->tmp.dh=NULL;
2394                 if (dh_clnt)
2395                         DH_free(dh_clnt);
2396                 else
2397                         BN_clear_free(pub);
2398                 pub=NULL;
2399                 s->session->master_key_length=
2400                         s->method->ssl3_enc->generate_master_secret(s,
2401                                 s->session->master_key,p,i);
2402                 OPENSSL_cleanse(p,i);
2403                 if (dh_clnt)
2404                         return 2;
2405                 }
2406         else
2407 #endif
2408 #ifndef OPENSSL_NO_KRB5
2409         if (alg_k & SSL_kKRB5)
2410                 {
2411                 krb5_error_code         krb5rc;
2412                 krb5_data               enc_ticket;
2413                 krb5_data               authenticator;
2414                 krb5_data               enc_pms;
2415                 KSSL_CTX                *kssl_ctx = s->kssl_ctx;
2416                 EVP_CIPHER_CTX          ciph_ctx;
2417                 const EVP_CIPHER        *enc = NULL;
2418                 unsigned char           iv[EVP_MAX_IV_LENGTH];
2419                 unsigned char           pms[SSL_MAX_MASTER_KEY_LENGTH
2420                                                + EVP_MAX_BLOCK_LENGTH];
2421                 int                  padl, outl;
2422                 krb5_timestamp          authtime = 0;
2423                 krb5_ticket_times       ttimes;
2424
2425                 EVP_CIPHER_CTX_init(&ciph_ctx);
2426
2427                 if (!kssl_ctx)  kssl_ctx = kssl_ctx_new();
2428
2429                 n2s(p,i);
2430                 enc_ticket.length = i;
2431
2432                 if (n < (long)(enc_ticket.length + 6))
2433                         {
2434                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2435                                 SSL_R_DATA_LENGTH_TOO_LONG);
2436                         goto err;
2437                         }
2438
2439                 enc_ticket.data = (char *)p;
2440                 p+=enc_ticket.length;
2441
2442                 n2s(p,i);
2443                 authenticator.length = i;
2444
2445                 if (n < (long)(enc_ticket.length + authenticator.length + 6))
2446                         {
2447                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2448                                 SSL_R_DATA_LENGTH_TOO_LONG);
2449                         goto err;
2450                         }
2451
2452                 authenticator.data = (char *)p;
2453                 p+=authenticator.length;
2454
2455                 n2s(p,i);
2456                 enc_pms.length = i;
2457                 enc_pms.data = (char *)p;
2458                 p+=enc_pms.length;
2459
2460                 /* Note that the length is checked again below,
2461                 ** after decryption
2462                 */
2463                 if(enc_pms.length > sizeof pms)
2464                         {
2465                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2466                                SSL_R_DATA_LENGTH_TOO_LONG);
2467                         goto err;
2468                         }
2469
2470                 if (n != (long)(enc_ticket.length + authenticator.length +
2471                                                 enc_pms.length + 6))
2472                         {
2473                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2474                                 SSL_R_DATA_LENGTH_TOO_LONG);
2475                         goto err;
2476                         }
2477
2478                 if ((krb5rc = kssl_sget_tkt(kssl_ctx, &enc_ticket, &ttimes,
2479                                         &kssl_err)) != 0)
2480                         {
2481 #ifdef KSSL_DEBUG
2482                         printf("kssl_sget_tkt rtn %d [%d]\n",
2483                                 krb5rc, kssl_err.reason);
2484                         if (kssl_err.text)
2485                                 printf("kssl_err text= %s\n", kssl_err.text);
2486 #endif  /* KSSL_DEBUG */
2487                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2488                                 kssl_err.reason);
2489                         goto err;
2490                         }
2491
2492                 /*  Note: no authenticator is not considered an error,
2493                 **  but will return authtime == 0.
2494                 */
2495                 if ((krb5rc = kssl_check_authent(kssl_ctx, &authenticator,
2496                                         &authtime, &kssl_err)) != 0)
2497                         {
2498 #ifdef KSSL_DEBUG
2499                         printf("kssl_check_authent rtn %d [%d]\n",
2500                                 krb5rc, kssl_err.reason);
2501                         if (kssl_err.text)
2502                                 printf("kssl_err text= %s\n", kssl_err.text);
2503 #endif  /* KSSL_DEBUG */
2504                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2505                                 kssl_err.reason);
2506                         goto err;
2507                         }
2508
2509                 if ((krb5rc = kssl_validate_times(authtime, &ttimes)) != 0)
2510                         {
2511                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, krb5rc);
2512                         goto err;
2513                         }
2514
2515 #ifdef KSSL_DEBUG
2516                 kssl_ctx_show(kssl_ctx);
2517 #endif  /* KSSL_DEBUG */
2518
2519                 enc = kssl_map_enc(kssl_ctx->enctype);
2520                 if (enc == NULL)
2521                     goto err;
2522
2523                 memset(iv, 0, sizeof iv);       /* per RFC 1510 */
2524
2525                 if (!EVP_DecryptInit_ex(&ciph_ctx,enc,NULL,kssl_ctx->key,iv))
2526                         {
2527                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2528                                 SSL_R_DECRYPTION_FAILED);
2529                         goto err;
2530                         }
2531                 if (!EVP_DecryptUpdate(&ciph_ctx, pms,&outl,
2532                                         (unsigned char *)enc_pms.data, enc_pms.length))
2533                         {
2534                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2535                                 SSL_R_DECRYPTION_FAILED);
2536                         goto err;
2537                         }
2538                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2539                         {
2540                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2541                                 SSL_R_DATA_LENGTH_TOO_LONG);
2542                         goto err;
2543                         }
2544                 if (!EVP_DecryptFinal_ex(&ciph_ctx,&(pms[outl]),&padl))
2545                         {
2546                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2547                                 SSL_R_DECRYPTION_FAILED);
2548                         goto err;
2549                         }
2550                 outl += padl;
2551                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2552                         {
2553                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2554                                 SSL_R_DATA_LENGTH_TOO_LONG);
2555                         goto err;
2556                         }
2557                 if (!((pms[0] == (s->client_version>>8)) && (pms[1] == (s->client_version & 0xff))))
2558                     {
2559                     /* The premaster secret must contain the same version number as the
2560                      * ClientHello to detect version rollback attacks (strangely, the
2561                      * protocol does not offer such protection for DH ciphersuites).
2562                      * However, buggy clients exist that send random bytes instead of
2563                      * the protocol version.
2564                      * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients.
2565                      * (Perhaps we should have a separate BUG value for the Kerberos cipher)
2566                      */
2567                     if (!(s->options & SSL_OP_TLS_ROLLBACK_BUG))
2568                         {
2569                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2570                                SSL_AD_DECODE_ERROR);
2571                         goto err;
2572                         }
2573                     }
2574
2575                 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2576
2577                 s->session->master_key_length=
2578                         s->method->ssl3_enc->generate_master_secret(s,
2579                                 s->session->master_key, pms, outl);
2580
2581                 if (kssl_ctx->client_princ)
2582                         {
2583                         size_t len = strlen(kssl_ctx->client_princ);
2584                         if ( len < SSL_MAX_KRB5_PRINCIPAL_LENGTH )
2585                                 {
2586                                 s->session->krb5_client_princ_len = len;
2587                                 memcpy(s->session->krb5_client_princ,kssl_ctx->client_princ,len);
2588                                 }
2589                         }
2590
2591
2592                 /*  Was doing kssl_ctx_free() here,
2593                 **  but it caused problems for apache.
2594                 **  kssl_ctx = kssl_ctx_free(kssl_ctx);
2595                 **  if (s->kssl_ctx)  s->kssl_ctx = NULL;
2596                 */
2597                 }
2598         else
2599 #endif  /* OPENSSL_NO_KRB5 */
2600
2601 #ifndef OPENSSL_NO_ECDH
2602                 if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2603                 {
2604                 int ret = 1;
2605                 int field_size = 0;
2606                 const EC_KEY   *tkey;
2607                 const EC_GROUP *group;
2608                 const BIGNUM *priv_key;
2609
2610                 /* initialize structures for server's ECDH key pair */
2611                 if ((srvr_ecdh = EC_KEY_new()) == NULL)
2612                         {
2613                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2614                             ERR_R_MALLOC_FAILURE);
2615                         goto err;
2616                         }
2617
2618                 /* Let's get server private key and group information */
2619                 if (alg_k & (SSL_kECDHr|SSL_kECDHe))
2620                         {
2621                         /* use the certificate */
2622                         tkey = s->cert->pkeys[SSL_PKEY_ECC].privatekey->pkey.ec;
2623                         }
2624                 else
2625                         {
2626                         /* use the ephermeral values we saved when
2627                          * generating the ServerKeyExchange msg.
2628                          */
2629                         tkey = s->s3->tmp.ecdh;
2630                         }
2631
2632                 group    = EC_KEY_get0_group(tkey);
2633                 priv_key = EC_KEY_get0_private_key(tkey);
2634
2635                 if (!EC_KEY_set_group(srvr_ecdh, group) ||
2636                     !EC_KEY_set_private_key(srvr_ecdh, priv_key))
2637                         {
2638                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2639                                ERR_R_EC_LIB);
2640                         goto err;
2641                         }
2642
2643                 /* Let's get client's public key */
2644                 if ((clnt_ecpoint = EC_POINT_new(group)) == NULL)
2645                         {
2646                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2647                             ERR_R_MALLOC_FAILURE);
2648                         goto err;
2649                         }
2650
2651                 if (n == 0L)
2652                         {
2653                         /* Client Publickey was in Client Certificate */
2654
2655                          if (alg_k & SSL_kEECDH)
2656                                  {
2657                                  al=SSL_AD_HANDSHAKE_FAILURE;
2658                                  SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
2659                                  goto f_err;
2660                                  }
2661                         if (((clnt_pub_pkey=X509_get_pubkey(s->session->peer))
2662                             == NULL) ||
2663                             (clnt_pub_pkey->type != EVP_PKEY_EC))
2664                                 {
2665                                 /* XXX: For now, we do not support client
2666                                  * authentication using ECDH certificates
2667                                  * so this branch (n == 0L) of the code is
2668                                  * never executed. When that support is
2669                                  * added, we ought to ensure the key
2670                                  * received in the certificate is
2671                                  * authorized for key agreement.
2672                                  * ECDH_compute_key implicitly checks that
2673                                  * the two ECDH shares are for the same
2674                                  * group.
2675                                  */
2676                                 al=SSL_AD_HANDSHAKE_FAILURE;
2677                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2678                                     SSL_R_UNABLE_TO_DECODE_ECDH_CERTS);
2679                                 goto f_err;
2680                                 }
2681
2682                         if (EC_POINT_copy(clnt_ecpoint,
2683                             EC_KEY_get0_public_key(clnt_pub_pkey->pkey.ec)) == 0)
2684                                 {
2685                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2686                                         ERR_R_EC_LIB);
2687                                 goto err;
2688                                 }
2689                         ret = 2; /* Skip certificate verify processing */
2690                         }
2691                 else
2692                         {
2693                         /* Get client's public key from encoded point
2694                          * in the ClientKeyExchange message.
2695                          */
2696                         if ((bn_ctx = BN_CTX_new()) == NULL)
2697                                 {
2698                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2699                                     ERR_R_MALLOC_FAILURE);
2700                                 goto err;
2701                                 }
2702
2703                         /* Get encoded point length */
2704                         i = *p;
2705                         p += 1;
2706                         if (n != 1 + i)
2707                                 {
2708                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2709                                     ERR_R_EC_LIB);
2710                                 goto err;
2711                                 }
2712                         if (EC_POINT_oct2point(group,
2713                             clnt_ecpoint, p, i, bn_ctx) == 0)
2714                                 {
2715                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2716                                     ERR_R_EC_LIB);
2717                                 goto err;
2718                                 }
2719                         /* p is pointing to somewhere in the buffer
2720                          * currently, so set it to the start
2721                          */
2722                         p=(unsigned char *)s->init_buf->data;
2723                         }
2724
2725                 /* Compute the shared pre-master secret */
2726                 field_size = EC_GROUP_get_degree(group);
2727                 if (field_size <= 0)
2728                         {
2729                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2730                                ERR_R_ECDH_LIB);
2731                         goto err;
2732                         }
2733                 i = ECDH_compute_key(p, (field_size+7)/8, clnt_ecpoint, srvr_ecdh, NULL);
2734                 if (i <= 0)
2735                         {
2736                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2737                             ERR_R_ECDH_LIB);
2738                         goto err;
2739                         }
2740
2741                 EVP_PKEY_free(clnt_pub_pkey);
2742                 EC_POINT_free(clnt_ecpoint);
2743                 EC_KEY_free(srvr_ecdh);
2744                 BN_CTX_free(bn_ctx);
2745                 EC_KEY_free(s->s3->tmp.ecdh);
2746                 s->s3->tmp.ecdh = NULL;
2747
2748                 /* Compute the master secret */
2749                 s->session->master_key_length = s->method->ssl3_enc-> \
2750                     generate_master_secret(s, s->session->master_key, p, i);
2751
2752                 OPENSSL_cleanse(p, i);
2753                 return (ret);
2754                 }
2755         else
2756 #endif
2757 #ifndef OPENSSL_NO_PSK
2758                 if (alg_k & SSL_kPSK)
2759                         {
2760                         unsigned char *t = NULL;
2761                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
2762                         unsigned int pre_ms_len = 0, psk_len = 0;
2763                         int psk_err = 1;
2764                         char tmp_id[PSK_MAX_IDENTITY_LEN+1];
2765
2766                         al=SSL_AD_HANDSHAKE_FAILURE;
2767
2768                         n2s(p,i);
2769                         if (n != i+2)
2770                                 {
2771                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2772                                         SSL_R_LENGTH_MISMATCH);
2773                                 goto psk_err;
2774                                 }
2775                         if (i > PSK_MAX_IDENTITY_LEN)
2776                                 {
2777                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2778                                         SSL_R_DATA_LENGTH_TOO_LONG);
2779                                 goto psk_err;
2780                                 }
2781                         if (s->psk_server_callback == NULL)
2782                                 {
2783                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2784                                        SSL_R_PSK_NO_SERVER_CB);
2785                                 goto psk_err;
2786                                 }
2787
2788                         /* Create guaranteed NULL-terminated identity
2789                          * string for the callback */
2790                         memcpy(tmp_id, p, i);
2791                         memset(tmp_id+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
2792                         psk_len = s->psk_server_callback(s, tmp_id,
2793                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
2794                         OPENSSL_cleanse(tmp_id, PSK_MAX_IDENTITY_LEN+1);
2795
2796                         if (psk_len > PSK_MAX_PSK_LEN)
2797                                 {
2798                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2799                                         ERR_R_INTERNAL_ERROR);
2800                                 goto psk_err;
2801                                 }
2802                         else if (psk_len == 0)
2803                                 {
2804                                 /* PSK related to the given identity not found */
2805                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2806                                        SSL_R_PSK_IDENTITY_NOT_FOUND);
2807                                 al=SSL_AD_UNKNOWN_PSK_IDENTITY;
2808                                 goto psk_err;
2809                                 }
2810
2811                         /* create PSK pre_master_secret */
2812                         pre_ms_len=2+psk_len+2+psk_len;
2813                         t = psk_or_pre_ms;
2814                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
2815                         s2n(psk_len, t);
2816                         memset(t, 0, psk_len);
2817                         t+=psk_len;
2818                         s2n(psk_len, t);
2819
2820                         if (s->session->psk_identity != NULL)
2821                                 OPENSSL_free(s->session->psk_identity);
2822                         s->session->psk_identity = BUF_strdup((char *)p);
2823                         if (s->session->psk_identity == NULL)
2824                                 {
2825                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2826                                         ERR_R_MALLOC_FAILURE);
2827                                 goto psk_err;
2828                                 }
2829
2830                         if (s->session->psk_identity_hint != NULL)
2831                                 OPENSSL_free(s->session->psk_identity_hint);
2832                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
2833                         if (s->ctx->psk_identity_hint != NULL &&
2834                                 s->session->psk_identity_hint == NULL)
2835                                 {
2836                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2837                                         ERR_R_MALLOC_FAILURE);
2838                                 goto psk_err;
2839                                 }
2840
2841                         s->session->master_key_length=
2842                                 s->method->ssl3_enc->generate_master_secret(s,
2843                                         s->session->master_key, psk_or_pre_ms, pre_ms_len);
2844                         psk_err = 0;
2845                 psk_err:
2846                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
2847                         if (psk_err != 0)
2848                                 goto f_err;
2849                         }
2850                 else
2851 #endif
2852 #ifndef OPENSSL_NO_SRP
2853                 if (alg_k & SSL_kSRP)
2854                         {
2855                         int param_len;
2856
2857                         n2s(p,i);
2858                         param_len=i+2;
2859                         if (param_len > n)
2860                                 {
2861                                 al=SSL_AD_DECODE_ERROR;
2862                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_SRP_A_LENGTH);
2863                                 goto f_err;
2864                                 }
2865                         if (!(s->srp_ctx.A=BN_bin2bn(p,i,NULL)))
2866                                 {
2867                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_BN_LIB);
2868                                 goto err;
2869                                 }
2870                         if (s->session->srp_username != NULL)
2871                                 OPENSSL_free(s->session->srp_username);
2872                         s->session->srp_username = BUF_strdup(s->srp_ctx.login);
2873                         if (s->session->srp_username == NULL)
2874                                 {
2875                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2876                                         ERR_R_MALLOC_FAILURE);
2877                                 goto err;
2878                                 }
2879
2880                         if ((s->session->master_key_length = SRP_generate_server_master_secret(s,s->session->master_key))<0)
2881                                 {
2882                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2883                                 goto err;
2884                                 }
2885
2886                         p+=i;
2887                         }
2888                 else
2889 #endif  /* OPENSSL_NO_SRP */
2890                 if (alg_k & SSL_kGOST)
2891                         {
2892                         int ret = 0;
2893                         EVP_PKEY_CTX *pkey_ctx;
2894                         EVP_PKEY *client_pub_pkey = NULL, *pk = NULL;
2895                         unsigned char premaster_secret[32], *start;
2896                         size_t outlen=32, inlen;
2897                         unsigned long alg_a;
2898
2899                         /* Get our certificate private key*/
2900                         alg_a = s->s3->tmp.new_cipher->algorithm_auth;
2901                         if (alg_a & SSL_aGOST94)
2902                                 pk = s->cert->pkeys[SSL_PKEY_GOST94].privatekey;
2903                         else if (alg_a & SSL_aGOST01)
2904                                 pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey;
2905
2906                         pkey_ctx = EVP_PKEY_CTX_new(pk,NULL);
2907                         EVP_PKEY_decrypt_init(pkey_ctx);
2908                         /* If client certificate is present and is of the same type, maybe
2909                          * use it for key exchange.  Don't mind errors from
2910                          * EVP_PKEY_derive_set_peer, because it is completely valid to use
2911                          * a client certificate for authorization only. */
2912                         client_pub_pkey = X509_get_pubkey(s->session->peer);
2913                         if (client_pub_pkey)
2914                                 {
2915                                 if (EVP_PKEY_derive_set_peer(pkey_ctx, client_pub_pkey) <= 0)
2916                                         ERR_clear_error();
2917                                 }
2918                         /* Decrypt session key */
2919                         if ((*p!=( V_ASN1_SEQUENCE| V_ASN1_CONSTRUCTED)))
2920                                 {
2921                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2922                                 goto gerr;
2923                                 }
2924                         if (p[1] == 0x81)
2925                                 {
2926                                 start = p+3;
2927                                 inlen = p[2];
2928                                 }
2929                         else if (p[1] < 0x80)
2930                                 {
2931                                 start = p+2;
2932                                 inlen = p[1];
2933                                 }
2934                         else
2935                                 {
2936                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2937                                 goto gerr;
2938                                 }
2939                         if (EVP_PKEY_decrypt(pkey_ctx,premaster_secret,&outlen,start,inlen) <=0)
2940
2941                                 {
2942                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2943                                 goto gerr;
2944                                 }
2945                         /* Generate master secret */
2946                         s->session->master_key_length=
2947                                 s->method->ssl3_enc->generate_master_secret(s,
2948                                         s->session->master_key,premaster_secret,32);
2949                         /* Check if pubkey from client certificate was used */
2950                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
2951                                 ret = 2;
2952                         else
2953                                 ret = 1;
2954                 gerr:
2955                         EVP_PKEY_free(client_pub_pkey);
2956                         EVP_PKEY_CTX_free(pkey_ctx);
2957                         if (ret)
2958                                 return ret;
2959                         else
2960                                 goto err;
2961                         }
2962                 else
2963                 {
2964                 al=SSL_AD_HANDSHAKE_FAILURE;
2965                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2966                                 SSL_R_UNKNOWN_CIPHER_TYPE);
2967                 goto f_err;
2968                 }
2969
2970         return(1);
2971 f_err:
2972         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2973 #if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA) || !defined(OPENSSL_NO_ECDH) || defined(OPENSSL_NO_SRP)
2974 err:
2975 #endif
2976 #ifndef OPENSSL_NO_ECDH
2977         EVP_PKEY_free(clnt_pub_pkey);
2978         EC_POINT_free(clnt_ecpoint);
2979         if (srvr_ecdh != NULL)
2980                 EC_KEY_free(srvr_ecdh);
2981         BN_CTX_free(bn_ctx);
2982 #endif
2983         return(-1);
2984         }
2985
2986 int ssl3_get_cert_verify(SSL *s)
2987         {
2988         EVP_PKEY *pkey=NULL;
2989         unsigned char *p;
2990         int al,ok,ret=0;
2991         long n;
2992         int type=0,i,j;
2993         X509 *peer;
2994         const EVP_MD *md = NULL;
2995         EVP_MD_CTX mctx;
2996         EVP_MD_CTX_init(&mctx);
2997
2998         n=s->method->ssl_get_message(s,
2999                 SSL3_ST_SR_CERT_VRFY_A,
3000                 SSL3_ST_SR_CERT_VRFY_B,
3001                 -1,
3002                 516, /* Enough for 4096 bit RSA key with TLS v1.2 */
3003                 &ok);
3004
3005         if (!ok) return((int)n);
3006
3007         if (s->session->peer != NULL)
3008                 {
3009                 peer=s->session->peer;
3010                 pkey=X509_get_pubkey(peer);
3011                 type=X509_certificate_type(peer,pkey);
3012                 }
3013         else
3014                 {
3015                 peer=NULL;
3016                 pkey=NULL;
3017                 }
3018
3019         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
3020                 {
3021                 s->s3->tmp.reuse_message=1;
3022                 if ((peer != NULL) && (type & EVP_PKT_SIGN))
3023                         {
3024                         al=SSL_AD_UNEXPECTED_MESSAGE;
3025                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
3026                         goto f_err;
3027                         }
3028                 ret=1;
3029                 goto end;
3030                 }
3031
3032         if (peer == NULL)
3033                 {
3034                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
3035                 al=SSL_AD_UNEXPECTED_MESSAGE;
3036                 goto f_err;
3037                 }
3038
3039         if (!(type & EVP_PKT_SIGN))
3040                 {
3041                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
3042                 al=SSL_AD_ILLEGAL_PARAMETER;
3043                 goto f_err;
3044                 }
3045
3046         if (s->s3->change_cipher_spec)
3047                 {
3048                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
3049                 al=SSL_AD_UNEXPECTED_MESSAGE;
3050                 goto f_err;
3051                 }
3052
3053         /* we now have a signature that we need to verify */
3054         p=(unsigned char *)s->init_msg;
3055         /* Check for broken implementations of GOST ciphersuites */
3056         /* If key is GOST and n is exactly 64, it is bare
3057          * signature without length field */
3058         if (n==64 && (pkey->type==NID_id_GostR3410_94 ||
3059                 pkey->type == NID_id_GostR3410_2001) )
3060                 {
3061                 i=64;
3062                 }
3063         else
3064                 {
3065                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
3066                         {
3067                         int rv = tls12_check_peer_sigalg(&md, s, p, pkey);
3068                         if (rv == -1)
3069                                 {
3070                                 al = SSL_AD_INTERNAL_ERROR;
3071                                 goto f_err;
3072                                 }
3073                         else if (rv == 0)
3074                                 {
3075                                 al = SSL_AD_DECODE_ERROR;
3076                                 goto f_err;
3077                                 }
3078 #ifdef SSL_DEBUG
3079 fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
3080 #endif
3081                         p += 2;
3082                         n -= 2;
3083                         }
3084                 n2s(p,i);
3085                 n-=2;
3086                 if (i > n)
3087                         {
3088                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
3089                         al=SSL_AD_DECODE_ERROR;
3090                         goto f_err;
3091                         }
3092         }
3093         j=EVP_PKEY_size(pkey);
3094         if ((i > j) || (n > j) || (n <= 0))
3095                 {
3096                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
3097                 al=SSL_AD_DECODE_ERROR;
3098                 goto f_err;
3099                 }
3100
3101         if (TLS1_get_version(s) >= TLS1_2_VERSION)
3102                 {
3103                 long hdatalen = 0;
3104                 void *hdata;
3105                 hdatalen = BIO_get_mem_data(s->s3->handshake_buffer, &hdata);
3106                 if (hdatalen <= 0)
3107                         {
3108                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, ERR_R_INTERNAL_ERROR);
3109                         al=SSL_AD_INTERNAL_ERROR;
3110                         goto f_err;
3111                         }
3112 #ifdef SSL_DEBUG
3113                 fprintf(stderr, "Using TLS 1.2 with client verify alg %s\n",
3114                                                         EVP_MD_name(md));
3115 #endif
3116                 if (!EVP_VerifyInit_ex(&mctx, md, NULL)
3117                         || !EVP_VerifyUpdate(&mctx, hdata, hdatalen))
3118                         {
3119                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, ERR_R_EVP_LIB);
3120                         al=SSL_AD_INTERNAL_ERROR;
3121                         goto f_err;
3122                         }
3123
3124                 if (EVP_VerifyFinal(&mctx, p , i, pkey) <= 0)
3125                         {
3126                         al=SSL_AD_DECRYPT_ERROR;
3127                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_SIGNATURE);
3128                         goto f_err;
3129                         }
3130                 }
3131         else
3132 #ifndef OPENSSL_NO_RSA
3133         if (pkey->type == EVP_PKEY_RSA)
3134                 {
3135                 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
3136                         MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i,
3137                                                         pkey->pkey.rsa);
3138                 if (i < 0)
3139                         {
3140                         al=SSL_AD_DECRYPT_ERROR;
3141                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
3142                         goto f_err;
3143                         }
3144                 if (i == 0)
3145                         {
3146                         al=SSL_AD_DECRYPT_ERROR;
3147                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
3148                         goto f_err;
3149                         }
3150                 }
3151         else
3152 #endif
3153 #ifndef OPENSSL_NO_DSA
3154                 if (pkey->type == EVP_PKEY_DSA)
3155                 {
3156                 j=DSA_verify(pkey->save_type,
3157                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
3158                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
3159                 if (j <= 0)
3160                         {
3161                         /* bad signature */
3162                         al=SSL_AD_DECRYPT_ERROR;
3163                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
3164                         goto f_err;
3165                         }
3166                 }
3167         else
3168 #endif
3169 #ifndef OPENSSL_NO_ECDSA
3170                 if (pkey->type == EVP_PKEY_EC)
3171                 {
3172                 j=ECDSA_verify(pkey->save_type,
3173                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
3174                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.ec);
3175                 if (j <= 0)
3176                         {
3177                         /* bad signature */
3178                         al=SSL_AD_DECRYPT_ERROR;
3179                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
3180                             SSL_R_BAD_ECDSA_SIGNATURE);
3181                         goto f_err;
3182                         }
3183                 }
3184         else
3185 #endif
3186         if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001)
3187                 {   unsigned char signature[64];
3188                         int idx;
3189                         EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new(pkey,NULL);
3190                         EVP_PKEY_verify_init(pctx);
3191                         if (i!=64) {
3192                                 fprintf(stderr,"GOST signature length is %d",i);
3193                         }
3194                         for (idx=0;idx<64;idx++) {
3195                                 signature[63-idx]=p[idx];
3196                         }
3197                         j=EVP_PKEY_verify(pctx,signature,64,s->s3->tmp.cert_verify_md,32);
3198                         EVP_PKEY_CTX_free(pctx);
3199                         if (j<=0)
3200                                 {
3201                                 al=SSL_AD_DECRYPT_ERROR;
3202                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
3203                                         SSL_R_BAD_ECDSA_SIGNATURE);
3204                                 goto f_err;
3205                                 }
3206                 }
3207         else
3208                 {
3209                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
3210                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
3211                 goto f_err;
3212                 }
3213
3214
3215         ret=1;
3216         if (0)
3217                 {
3218 f_err:
3219                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
3220                 }
3221 end:
3222         if (s->s3->handshake_buffer)
3223                 {
3224                 BIO_free(s->s3->handshake_buffer);
3225                 s->s3->handshake_buffer = NULL;
3226                 s->s3->flags &= ~TLS1_FLAGS_KEEP_HANDSHAKE;
3227                 }
3228         EVP_MD_CTX_cleanup(&mctx);
3229         EVP_PKEY_free(pkey);
3230         return(ret);
3231         }
3232
3233 int ssl3_get_client_certificate(SSL *s)
3234         {
3235         int i,ok,al,ret= -1;
3236         X509 *x=NULL;
3237         unsigned long l,nc,llen,n;
3238         const unsigned char *p,*q;
3239         unsigned char *d;
3240         STACK_OF(X509) *sk=NULL;
3241
3242         n=s->method->ssl_get_message(s,
3243                 SSL3_ST_SR_CERT_A,
3244                 SSL3_ST_SR_CERT_B,
3245                 -1,
3246                 s->max_cert_list,
3247                 &ok);
3248
3249         if (!ok) return((int)n);
3250
3251         if      (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
3252                 {
3253                 if (    (s->verify_mode & SSL_VERIFY_PEER) &&
3254                         (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
3255                         {
3256                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
3257                         al=SSL_AD_HANDSHAKE_FAILURE;
3258                         goto f_err;
3259                         }
3260                 /* If tls asked for a client cert, the client must return a 0 list */
3261                 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
3262                         {
3263                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
3264                         al=SSL_AD_UNEXPECTED_MESSAGE;
3265                         goto f_err;
3266                         }
3267                 s->s3->tmp.reuse_message=1;
3268                 return(1);
3269                 }
3270
3271         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
3272                 {
3273                 al=SSL_AD_UNEXPECTED_MESSAGE;
3274                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
3275                 goto f_err;
3276                 }
3277         p=d=(unsigned char *)s->init_msg;
3278
3279         if ((sk=sk_X509_new_null()) == NULL)
3280                 {
3281                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
3282                 goto err;
3283                 }
3284
3285         n2l3(p,llen);
3286         if (llen+3 != n)
3287                 {
3288                 al=SSL_AD_DECODE_ERROR;
3289                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
3290                 goto f_err;
3291                 }
3292         for (nc=0; nc<llen; )
3293                 {
3294                 n2l3(p,l);
3295                 if ((l+nc+3) > llen)
3296                         {
3297                         al=SSL_AD_DECODE_ERROR;
3298                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
3299                         goto f_err;
3300                         }
3301
3302                 q=p;
3303                 x=d2i_X509(NULL,&p,l);
3304                 if (x == NULL)
3305                         {
3306                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
3307                         goto err;
3308                         }
3309                 if (p != (q+l))
3310                         {
3311                         al=SSL_AD_DECODE_ERROR;
3312                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
3313                         goto f_err;
3314                         }
3315                 if (!sk_X509_push(sk,x))
3316                         {
3317                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
3318                         goto err;
3319                         }
3320                 x=NULL;
3321                 nc+=l+3;
3322                 }
3323
3324         if (sk_X509_num(sk) <= 0)
3325                 {
3326                 /* TLS does not mind 0 certs returned */
3327                 if (s->version == SSL3_VERSION)
3328                         {
3329                         al=SSL_AD_HANDSHAKE_FAILURE;
3330                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
3331                         goto f_err;
3332                         }
3333                 /* Fail for TLS only if we required a certificate */
3334                 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
3335                          (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
3336                         {
3337                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
3338                         al=SSL_AD_HANDSHAKE_FAILURE;
3339                         goto f_err;
3340                         }
3341                 /* No client certificate so digest cached records */
3342                 if (s->s3->handshake_buffer && !ssl3_digest_cached_records(s))
3343                         {
3344                         al=SSL_AD_INTERNAL_ERROR;
3345                         goto f_err;
3346                         }
3347                 }
3348         else
3349                 {
3350                 i=ssl_verify_cert_chain(s,sk);
3351                 if (i <= 0)
3352                         {
3353                         al=ssl_verify_alarm_type(s->verify_result);
3354                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
3355                         goto f_err;
3356                         }
3357                 }
3358
3359         if (s->session->peer != NULL) /* This should not be needed */
3360                 X509_free(s->session->peer);
3361         s->session->peer=sk_X509_shift(sk);
3362         s->session->verify_result = s->verify_result;
3363
3364         /* With the current implementation, sess_cert will always be NULL
3365          * when we arrive here. */
3366         if (s->session->sess_cert == NULL)
3367                 {
3368                 s->session->sess_cert = ssl_sess_cert_new();
3369                 if (s->session->sess_cert == NULL)
3370                         {
3371                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
3372                         goto err;
3373                         }
3374                 }
3375         if (s->session->sess_cert->cert_chain != NULL)
3376                 sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free);
3377         s->session->sess_cert->cert_chain=sk;
3378         /* Inconsistency alert: cert_chain does *not* include the
3379          * peer's own certificate, while we do include it in s3_clnt.c */
3380
3381         sk=NULL;
3382
3383         ret=1;
3384         if (0)
3385                 {
3386 f_err:
3387                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
3388                 }
3389 err:
3390         if (x != NULL) X509_free(x);
3391         if (sk != NULL) sk_X509_pop_free(sk,X509_free);
3392         return(ret);
3393         }
3394
3395 int ssl3_send_server_certificate(SSL *s)
3396         {
3397         unsigned long l;
3398         CERT_PKEY *cpk;
3399
3400         if (s->state == SSL3_ST_SW_CERT_A)
3401                 {
3402                 cpk=ssl_get_server_send_pkey(s);
3403                 if (cpk == NULL)
3404                         {
3405                         /* VRS: allow null cert if auth == KRB5 */
3406                         if ((s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5) ||
3407                             (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5))
3408                                 {
3409                                 SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
3410                                 return(0);
3411                                 }
3412                         }
3413
3414                 l=ssl3_output_cert_chain(s,cpk);
3415                 s->state=SSL3_ST_SW_CERT_B;
3416                 s->init_num=(int)l;
3417                 s->init_off=0;
3418                 }
3419
3420         /* SSL3_ST_SW_CERT_B */
3421         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3422         }
3423
3424 #ifndef OPENSSL_NO_TLSEXT
3425 /* send a new session ticket (not necessarily for a new session) */
3426 int ssl3_send_newsession_ticket(SSL *s)
3427         {
3428         if (s->state == SSL3_ST_SW_SESSION_TICKET_A)
3429                 {
3430                 unsigned char *p, *senc, *macstart;
3431                 const unsigned char *const_p;
3432                 int len, slen_full, slen;
3433                 SSL_SESSION *sess;
3434                 unsigned int hlen;
3435                 EVP_CIPHER_CTX ctx;
3436                 HMAC_CTX hctx;
3437                 SSL_CTX *tctx = s->initial_ctx;
3438                 unsigned char iv[EVP_MAX_IV_LENGTH];
3439                 unsigned char key_name[16];
3440
3441                 /* get session encoding length */
3442                 slen_full = i2d_SSL_SESSION(s->session, NULL);
3443                 /* Some length values are 16 bits, so forget it if session is
3444                  * too long
3445                  */
3446                 if (slen_full > 0xFF00)
3447                         return -1;
3448                 senc = OPENSSL_malloc(slen_full);
3449                 if (!senc)
3450                         return -1;
3451                 p = senc;
3452                 i2d_SSL_SESSION(s->session, &p);
3453
3454                 /* create a fresh copy (not shared with other threads) to clean up */
3455                 const_p = senc;
3456                 sess = d2i_SSL_SESSION(NULL, &const_p, slen_full);
3457                 if (sess == NULL)
3458                         {
3459                         OPENSSL_free(senc);
3460                         return -1;
3461                         }
3462                 sess->session_id_length = 0; /* ID is irrelevant for the ticket */
3463
3464                 slen = i2d_SSL_SESSION(sess, NULL);
3465                 if (slen > slen_full) /* shouldn't ever happen */
3466                         {
3467                         OPENSSL_free(senc);
3468                         return -1;
3469                         }
3470                 p = senc;
3471                 i2d_SSL_SESSION(sess, &p);
3472                 SSL_SESSION_free(sess);
3473
3474                 /* Grow buffer if need be: the length calculation is as
3475                  * follows 1 (size of message name) + 3 (message length
3476                  * bytes) + 4 (ticket lifetime hint) + 2 (ticket length) +
3477                  * 16 (key name) + max_iv_len (iv length) +
3478                  * session_length + max_enc_block_size (max encrypted session
3479                  * length) + max_md_size (HMAC).
3480                  */
3481                 if (!BUF_MEM_grow(s->init_buf,
3482                         26 + EVP_MAX_IV_LENGTH + EVP_MAX_BLOCK_LENGTH +
3483                         EVP_MAX_MD_SIZE + slen))
3484                         return -1;
3485
3486                 p=(unsigned char *)s->init_buf->data;
3487                 /* do the header */
3488                 *(p++)=SSL3_MT_NEWSESSION_TICKET;
3489                 /* Skip message length for now */
3490                 p += 3;
3491                 EVP_CIPHER_CTX_init(&ctx);
3492                 HMAC_CTX_init(&hctx);
3493                 /* Initialize HMAC and cipher contexts. If callback present
3494                  * it does all the work otherwise use generated values
3495                  * from parent ctx.
3496                  */
3497                 if (tctx->tlsext_ticket_key_cb)
3498                         {
3499                         if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx,
3500                                                          &hctx, 1) < 0)
3501                                 {
3502                                 OPENSSL_free(senc);
3503                                 return -1;
3504                                 }
3505                         }
3506                 else
3507                         {
3508                         RAND_pseudo_bytes(iv, 16);
3509                         EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
3510                                         tctx->tlsext_tick_aes_key, iv);
3511                         HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
3512                                         tlsext_tick_md(), NULL);
3513                         memcpy(key_name, tctx->tlsext_tick_key_name, 16);
3514                         }
3515
3516                 /* Ticket lifetime hint (advisory only):
3517                  * We leave this unspecified for resumed session (for simplicity),
3518                  * and guess that tickets for new sessions will live as long
3519                  * as their sessions. */
3520                 l2n(s->hit ? 0 : s->session->timeout, p);
3521
3522                 /* Skip ticket length for now */
3523                 p += 2;
3524                 /* Output key name */
3525                 macstart = p;
3526                 memcpy(p, key_name, 16);
3527                 p += 16;
3528                 /* output IV */
3529                 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
3530                 p += EVP_CIPHER_CTX_iv_length(&ctx);
3531                 /* Encrypt session data */
3532                 EVP_EncryptUpdate(&ctx, p, &len, senc, slen);
3533                 p += len;
3534                 EVP_EncryptFinal(&ctx, p, &len);
3535                 p += len;
3536                 EVP_CIPHER_CTX_cleanup(&ctx);
3537
3538                 HMAC_Update(&hctx, macstart, p - macstart);
3539                 HMAC_Final(&hctx, p, &hlen);
3540                 HMAC_CTX_cleanup(&hctx);
3541
3542                 p += hlen;
3543                 /* Now write out lengths: p points to end of data written */
3544                 /* Total length */
3545                 len = p - (unsigned char *)s->init_buf->data;
3546                 p=(unsigned char *)s->init_buf->data + 1;
3547                 l2n3(len - 4, p); /* Message length */
3548                 p += 4;
3549                 s2n(len - 10, p);  /* Ticket length */
3550
3551                 /* number of bytes to write */
3552                 s->init_num= len;
3553                 s->state=SSL3_ST_SW_SESSION_TICKET_B;
3554                 s->init_off=0;
3555                 OPENSSL_free(senc);
3556                 }
3557
3558         /* SSL3_ST_SW_SESSION_TICKET_B */
3559         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3560         }
3561
3562 int ssl3_send_cert_status(SSL *s)
3563         {
3564         if (s->state == SSL3_ST_SW_CERT_STATUS_A)
3565                 {
3566                 unsigned char *p;
3567                 /* Grow buffer if need be: the length calculation is as
3568                  * follows 1 (message type) + 3 (message length) +
3569                  * 1 (ocsp response type) + 3 (ocsp response length)
3570                  * + (ocsp response)
3571                  */
3572                 if (!BUF_MEM_grow(s->init_buf, 8 + s->tlsext_ocsp_resplen))
3573                         return -1;
3574
3575                 p=(unsigned char *)s->init_buf->data;
3576
3577                 /* do the header */
3578                 *(p++)=SSL3_MT_CERTIFICATE_STATUS;
3579                 /* message length */
3580                 l2n3(s->tlsext_ocsp_resplen + 4, p);
3581                 /* status type */
3582                 *(p++)= s->tlsext_status_type;
3583                 /* length of OCSP response */
3584                 l2n3(s->tlsext_ocsp_resplen, p);
3585                 /* actual response */
3586                 memcpy(p, s->tlsext_ocsp_resp, s->tlsext_ocsp_resplen);
3587                 /* number of bytes to write */
3588                 s->init_num = 8 + s->tlsext_ocsp_resplen;
3589                 s->state=SSL3_ST_SW_CERT_STATUS_B;
3590                 s->init_off = 0;
3591                 }
3592
3593         /* SSL3_ST_SW_CERT_STATUS_B */
3594         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3595         }
3596
3597 # ifndef OPENSSL_NO_NEXTPROTONEG
3598 /* ssl3_get_next_proto reads a Next Protocol Negotiation handshake message. It
3599  * sets the next_proto member in s if found */
3600 int ssl3_get_next_proto(SSL *s)
3601         {
3602         int ok;
3603         int proto_len, padding_len;
3604         long n;
3605         const unsigned char *p;
3606
3607         /* Clients cannot send a NextProtocol message if we didn't see the
3608          * extension in their ClientHello */
3609         if (!s->s3->next_proto_neg_seen)
3610                 {
3611                 SSLerr(SSL_F_SSL3_GET_NEXT_PROTO,SSL_R_GOT_NEXT_PROTO_WITHOUT_EXTENSION);
3612                 return -1;
3613                 }
3614
3615         n=s->method->ssl_get_message(s,
3616                 SSL3_ST_SR_NEXT_PROTO_A,
3617                 SSL3_ST_SR_NEXT_PROTO_B,
3618                 SSL3_MT_NEXT_PROTO,
3619                 514,  /* See the payload format below */
3620                 &ok);
3621
3622         if (!ok)
3623                 return((int)n);
3624
3625         /* s->state doesn't reflect whether ChangeCipherSpec has been received
3626          * in this handshake, but s->s3->change_cipher_spec does (will be reset
3627          * by ssl3_get_finished). */
3628         if (!s->s3->change_cipher_spec)
3629                 {
3630                 SSLerr(SSL_F_SSL3_GET_NEXT_PROTO,SSL_R_GOT_NEXT_PROTO_BEFORE_A_CCS);
3631                 return -1;
3632                 }
3633
3634         if (n < 2)
3635                 return 0;  /* The body must be > 1 bytes long */
3636
3637         p=(unsigned char *)s->init_msg;
3638
3639         /* The payload looks like:
3640          *   uint8 proto_len;
3641          *   uint8 proto[proto_len];
3642          *   uint8 padding_len;
3643          *   uint8 padding[padding_len];
3644          */
3645         proto_len = p[0];
3646         if (proto_len + 2 > s->init_num)
3647                 return 0;
3648         padding_len = p[proto_len + 1];
3649         if (proto_len + padding_len + 2 != s->init_num)
3650                 return 0;
3651
3652         s->next_proto_negotiated = OPENSSL_malloc(proto_len);
3653         if (!s->next_proto_negotiated)
3654                 {
3655                 SSLerr(SSL_F_SSL3_GET_NEXT_PROTO,ERR_R_MALLOC_FAILURE);
3656                 return 0;
3657                 }
3658         memcpy(s->next_proto_negotiated, p + 1, proto_len);
3659         s->next_proto_negotiated_len = proto_len;
3660
3661         return 1;
3662         }
3663 # endif
3664
3665 int tls1_send_server_supplemental_data(SSL *s)
3666         {
3667         size_t length = 0;
3668         const unsigned char *authz, *orig_authz;
3669         unsigned char *p;
3670         size_t authz_length, i;
3671
3672         if (s->state != SSL3_ST_SW_SUPPLEMENTAL_DATA_A)
3673                 return ssl3_do_write(s, SSL3_RT_HANDSHAKE);
3674
3675         orig_authz = authz = ssl_get_authz_data(s, &authz_length);
3676         if (authz == NULL)
3677                 {
3678                 /* This should never occur. */
3679                 return 0;
3680                 }
3681
3682         /* First we walk over the authz data to see how long the handshake
3683          * message will be. */
3684         for (i = 0; i < authz_length; i++)
3685                 {
3686                 unsigned short len;
3687                 unsigned char type;
3688
3689                 type = *(authz++);
3690                 n2s(authz, len);
3691                 /* n2s increments authz by 2*/
3692                 i += 2;
3693
3694                 if (memchr(s->s3->tlsext_authz_client_types,
3695                            type,
3696                            s->s3->tlsext_authz_client_types_len) != NULL)
3697                         length += 1 /* authz type */ + 2 /* length */ + len;
3698
3699                 authz += len;
3700                 i += len;
3701                 }
3702
3703         length += 1 /* handshake type */ +
3704                   3 /* handshake length */ +
3705                   3 /* supplemental data length */ +
3706                   2 /* supplemental entry type */ +
3707                   2 /* supplemental entry length */;
3708
3709         if (!BUF_MEM_grow_clean(s->init_buf, length))
3710                 {
3711                 SSLerr(SSL_F_TLS1_SEND_SERVER_SUPPLEMENTAL_DATA,ERR_R_BUF_LIB);
3712                 return 0;
3713                 }
3714
3715         p = (unsigned char *)s->init_buf->data;
3716         *(p++) = SSL3_MT_SUPPLEMENTAL_DATA;
3717         /* Handshake length */
3718         l2n3(length - 4, p);
3719         /* Length of supplemental data */
3720         l2n3(length - 7, p);
3721         /* Supplemental data type */
3722         s2n(TLSEXT_SUPPLEMENTALDATATYPE_authz_data, p);
3723         /* Its length */
3724         s2n(length - 11, p);
3725
3726         authz = orig_authz;
3727
3728         /* Walk over the authz again and append the selected elements. */
3729         for (i = 0; i < authz_length; i++)
3730                 {
3731                 unsigned short len;
3732                 unsigned char type;
3733
3734                 type = *(authz++);
3735                 n2s(authz, len);
3736                 /* n2s increments authz by 2 */
3737                 i += 2;
3738
3739                 if (memchr(s->s3->tlsext_authz_client_types,
3740                            type,
3741                            s->s3->tlsext_authz_client_types_len) != NULL)
3742                         {
3743                         *(p++) = type;
3744                         s2n(len, p);
3745                         memcpy(p, authz, len);
3746                         p += len;
3747                         }
3748
3749                 authz += len;
3750                 i += len;
3751                 }
3752
3753         s->state = SSL3_ST_SW_SUPPLEMENTAL_DATA_B;
3754         s->init_num = length;
3755         s->init_off = 0;
3756
3757         return ssl3_do_write(s, SSL3_RT_HANDSHAKE);
3758         }
3759 #endif