ssl/s3_srvr.c

   1 /* ssl/s3_srvr.c -*- mode:C; c-file-style: "eay" -*- */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58 /* ====================================================================
  59  * Copyright (c) 1998-2007 The OpenSSL Project.  All rights reserved.
  60  *
  61  * Redistribution and use in source and binary forms, with or without
  62  * modification, are permitted provided that the following conditions
  63  * are met:
  64  *
  65  * 1. Redistributions of source code must retain the above copyright
  66  *    notice, this list of conditions and the following disclaimer.
  67  *
  68  * 2. Redistributions in binary form must reproduce the above copyright
  69  *    notice, this list of conditions and the following disclaimer in
  70  *    the documentation and/or other materials provided with the
  71  *    distribution.
  72  *
  73  * 3. All advertising materials mentioning features or use of this
  74  *    software must display the following acknowledgment:
  75  *    "This product includes software developed by the OpenSSL Project
  76  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  77  *
  78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  79  *    endorse or promote products derived from this software without
  80  *    prior written permission. For written permission, please contact
  81  *    openssl-core@openssl.org.
  82  *
  83  * 5. Products derived from this software may not be called "OpenSSL"
  84  *    nor may "OpenSSL" appear in their names without prior written
  85  *    permission of the OpenSSL Project.
  86  *
  87  * 6. Redistributions of any form whatsoever must retain the following
  88  *    acknowledgment:
  89  *    "This product includes software developed by the OpenSSL Project
  90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  91  *
  92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  95  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 103  * OF THE POSSIBILITY OF SUCH DAMAGE.
 104  * ====================================================================
 105  *
 106  * This product includes cryptographic software written by Eric Young
 107  * (eay@cryptsoft.com).  This product includes software written by Tim
 108  * Hudson (tjh@cryptsoft.com).
 109  *
 110  */
 111 /* ====================================================================
 112  * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
 113  *
 114  * Portions of the attached software ("Contribution") are developed by
 115  * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
 116  *
 117  * The Contribution is licensed pursuant to the OpenSSL open source
 118  * license provided above.
 119  *
 120  * ECC cipher suite support in OpenSSL originally written by
 121  * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories.
 122  *
 123  */
 124 /* ====================================================================
 125  * Copyright 2005 Nokia. All rights reserved.
 126  *
 127  * The portions of the attached software ("Contribution") is developed by
 128  * Nokia Corporation and is licensed pursuant to the OpenSSL open source
 129  * license.
 130  *
 131  * The Contribution, originally written by Mika Kousa and Pasi Eronen of
 132  * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
 133  * support (see RFC 4279) to OpenSSL.
 134  *
 135  * No patent licenses or other rights except those expressly stated in
 136  * the OpenSSL open source license shall be deemed granted or received
 137  * expressly, by implication, estoppel, or otherwise.
 138  *
 139  * No assurances are provided by Nokia that the Contribution does not
 140  * infringe the patent or other intellectual property rights of any third
 141  * party or that the license provides you with all the necessary rights
 142  * to make use of the Contribution.
 143  *
 144  * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
 145  * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
 146  * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
 147  * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
 148  * OTHERWISE.
 149  */
 150
 151 #define REUSE_CIPHER_BUG
 152 #define NETSCAPE_HANG_BUG
 153
 154 #include <stdio.h>
 155 #include "ssl_locl.h"
 156 #include "kssl_lcl.h"
 157 #include "../crypto/constant_time_locl.h"
 158 #include <openssl/buffer.h>
 159 #include <openssl/rand.h>
 160 #include <openssl/objects.h>
 161 #include <openssl/evp.h>
 162 #include <openssl/hmac.h>
 163 #include <openssl/x509.h>
 164 #ifndef OPENSSL_NO_DH
 165 #include <openssl/dh.h>
 166 #endif
 167 #include <openssl/bn.h>
 168 #ifndef OPENSSL_NO_KRB5
 169 #include <openssl/krb5_asn.h>
 170 #endif
 171 #include <openssl/md5.h>
 172
 173 #ifndef OPENSSL_NO_SSL3_METHOD
 174 static const SSL_METHOD *ssl3_get_server_method(int ver);
 175
 176 static const SSL_METHOD *ssl3_get_server_method(int ver)
 177         {
 178         if (ver == SSL3_VERSION)
 179                 return(SSLv3_server_method());
 180         else
 181                 return(NULL);
 182         }
 183
 184 IMPLEMENT_ssl3_meth_func(SSLv3_server_method,
 185                         ssl3_accept,
 186                         ssl_undefined_function,
 187                         ssl3_get_server_method)
 188 #endif
 189
 190 #ifndef OPENSSL_NO_SRP
 191 static int ssl_check_srp_ext_ClientHello(SSL *s, int *al)
 192         {
 193         int ret = SSL_ERROR_NONE;
 194
 195         *al = SSL_AD_UNRECOGNIZED_NAME;
 196
 197         if ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP) &&
 198             (s->srp_ctx.TLS_ext_srp_username_callback != NULL))
 199                 {
 200                 if(s->srp_ctx.login == NULL)
 201                         {
 202                         /* RFC 5054 says SHOULD reject,
 203                            we do so if There is no srp login name */
 204                         ret = SSL3_AL_FATAL;
 205                         *al = SSL_AD_UNKNOWN_PSK_IDENTITY;
 206                         }
 207                 else
 208                         {
 209                         ret = SSL_srp_server_param_with_username(s,al);
 210                         }
 211                 }
 212         return ret;
 213         }
 214 #endif
 215
 216 int ssl3_accept(SSL *s)
 217         {
 218         BUF_MEM *buf;
 219         unsigned long alg_k,Time=(unsigned long)time(NULL);
 220         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 221         int ret= -1;
 222         int new_state,state,skip=0;
 223
 224         RAND_add(&Time,sizeof(Time),0);
 225         ERR_clear_error();
 226         clear_sys_error();
 227
 228         if (s->info_callback != NULL)
 229                 cb=s->info_callback;
 230         else if (s->ctx->info_callback != NULL)
 231                 cb=s->ctx->info_callback;
 232
 233         /* init things to blank */
 234         s->in_handshake++;
 235         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 236
 237         if (s->cert == NULL)
 238                 {
 239                 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
 240                 return(-1);
 241                 }
 242
 243 #ifndef OPENSSL_NO_HEARTBEATS
 244         /* If we're awaiting a HeartbeatResponse, pretend we
 245          * already got and don't await it anymore, because
 246          * Heartbeats don't make sense during handshakes anyway.
 247          */
 248         if (s->tlsext_hb_pending)
 249                 {
 250                 s->tlsext_hb_pending = 0;
 251                 s->tlsext_hb_seq++;
 252                 }
 253 #endif
 254
 255         for (;;)
 256                 {
 257                 state=s->state;
 258
 259                 switch (s->state)
 260                         {
 261                 case SSL_ST_RENEGOTIATE:
 262                         s->renegotiate=1;
 263                         /* s->state=SSL_ST_ACCEPT; */
 264
 265                 case SSL_ST_BEFORE:
 266                 case SSL_ST_ACCEPT:
 267                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 268                 case SSL_ST_OK|SSL_ST_ACCEPT:
 269
 270                         s->server=1;
 271                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 272
 273                         if ((s->version>>8) != 3)
 274                                 {
 275                                 SSLerr(SSL_F_SSL3_ACCEPT, ERR_R_INTERNAL_ERROR);
 276                                 return -1;
 277                                 }
 278
 279                         if (!ssl_security(s, SSL_SECOP_VERSION, 0,
 280                                                         s->version, NULL))
 281                                 {
 282                                 SSLerr(SSL_F_SSL3_ACCEPT, SSL_R_VERSION_TOO_LOW);
 283                                 return -1;
 284                                 }
 285
 286                         s->type=SSL_ST_ACCEPT;
 287
 288                         if (s->init_buf == NULL)
 289                                 {
 290                                 if ((buf=BUF_MEM_new()) == NULL)
 291                                         {
 292                                         ret= -1;
 293                                         goto end;
 294                                         }
 295                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 296                                         {
 297                                         BUF_MEM_free(buf);
 298                                         ret= -1;
 299                                         goto end;
 300                                         }
 301                                 s->init_buf=buf;
 302                                 }
 303
 304                         if (!ssl3_setup_buffers(s))
 305                                 {
 306                                 ret= -1;
 307                                 goto end;
 308                                 }
 309
 310                         s->init_num=0;
 311                         s->s3->flags &= ~TLS1_FLAGS_SKIP_CERT_VERIFY;
 312                         s->s3->flags &= ~SSL3_FLAGS_CCS_OK;
 313                         /* Should have been reset by ssl3_get_finished, too. */
 314                         s->s3->change_cipher_spec = 0;
 315
 316                         if (s->state != SSL_ST_RENEGOTIATE)
 317                                 {
 318                                 /* Ok, we now need to push on a buffering BIO so that
 319                                  * the output is sent in a way that TCP likes :-)
 320                                  */
 321                                 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
 322
 323                                 ssl3_init_finished_mac(s);
 324                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
 325                                 s->ctx->stats.sess_accept++;
 326                                 }
 327                         else if (!s->s3->send_connection_binding &&
 328                                 !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
 329                                 {
 330                                 /* Server attempting to renegotiate with
 331                                  * client that doesn't support secure
 332                                  * renegotiation.
 333                                  */
 334                                 SSLerr(SSL_F_SSL3_ACCEPT, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
 335                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
 336                                 ret = -1;
 337                                 goto end;
 338                                 }
 339                         else
 340                                 {
 341                                 /* s->state == SSL_ST_RENEGOTIATE,
 342                                  * we will just send a HelloRequest */
 343                                 s->ctx->stats.sess_accept_renegotiate++;
 344                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
 345                                 }
 346                         break;
 347
 348                 case SSL3_ST_SW_HELLO_REQ_A:
 349                 case SSL3_ST_SW_HELLO_REQ_B:
 350
 351                         s->shutdown=0;
 352                         ret=ssl3_send_hello_request(s);
 353                         if (ret <= 0) goto end;
 354                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
 355                         s->state=SSL3_ST_SW_FLUSH;
 356                         s->init_num=0;
 357
 358                         ssl3_init_finished_mac(s);
 359                         break;
 360
 361                 case SSL3_ST_SW_HELLO_REQ_C:
 362                         s->state=SSL_ST_OK;
 363                         break;
 364
 365                 case SSL3_ST_SR_CLNT_HELLO_A:
 366                 case SSL3_ST_SR_CLNT_HELLO_B:
 367                 case SSL3_ST_SR_CLNT_HELLO_C:
 368
 369                         ret=ssl3_get_client_hello(s);
 370                         if (ret <= 0) goto end;
 371 #ifndef OPENSSL_NO_SRP
 372                         s->state = SSL3_ST_SR_CLNT_HELLO_D;
 373                 case SSL3_ST_SR_CLNT_HELLO_D:
 374                         {
 375                         int al;
 376                         if ((ret = ssl_check_srp_ext_ClientHello(s,&al))  < 0)
 377                                         {
 378                                         /* callback indicates firther work to be done */
 379                                         s->rwstate=SSL_X509_LOOKUP;
 380                                         goto end;
 381                                         }
 382                         if (ret != SSL_ERROR_NONE)
 383                                 {
 384                                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
 385                                 /* This is not really an error but the only means to
 386                                    for a client to detect whether srp is supported. */
 387                                    if (al != TLS1_AD_UNKNOWN_PSK_IDENTITY)
 388                                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_CLIENTHELLO_TLSEXT);
 389                                 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
 390                                 ret= -1;
 391                                 goto end;
 392                                 }
 393                         }
 394 #endif
 395
 396                         s->renegotiate = 2;
 397                         s->state=SSL3_ST_SW_SRVR_HELLO_A;
 398                         s->init_num=0;
 399                         break;
 400
 401                 case SSL3_ST_SW_SRVR_HELLO_A:
 402                 case SSL3_ST_SW_SRVR_HELLO_B:
 403                         ret=ssl3_send_server_hello(s);
 404                         if (ret <= 0) goto end;
 405 #ifndef OPENSSL_NO_TLSEXT
 406                         if (s->hit)
 407                                 {
 408                                 if (s->tlsext_ticket_expected)
 409                                         s->state=SSL3_ST_SW_SESSION_TICKET_A;
 410                                 else
 411                                         s->state=SSL3_ST_SW_CHANGE_A;
 412                                 }
 413 #else
 414                         if (s->hit)
 415                                         s->state=SSL3_ST_SW_CHANGE_A;
 416 #endif
 417                         else
 418                                         s->state = SSL3_ST_SW_CERT_A;
 419                         s->init_num = 0;
 420                         break;
 421
 422                 case SSL3_ST_SW_CERT_A:
 423                 case SSL3_ST_SW_CERT_B:
 424                         /* Check if it is anon DH or anon ECDH, */
 425                         /* normal PSK or KRB5 or SRP */
 426                         if (!(s->s3->tmp.new_cipher->algorithm_auth & (SSL_aNULL|SSL_aKRB5|SSL_aSRP))
 427                                 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 428                                 {
 429                                 ret=ssl3_send_server_certificate(s);
 430                                 if (ret <= 0) goto end;
 431 #ifndef OPENSSL_NO_TLSEXT
 432                                 if (s->tlsext_status_expected)
 433                                         s->state=SSL3_ST_SW_CERT_STATUS_A;
 434                                 else
 435                                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 436                                 }
 437                         else
 438                                 {
 439                                 skip = 1;
 440                                 s->state=SSL3_ST_SW_KEY_EXCH_A;
 441                                 }
 442 #else
 443                                 }
 444                         else
 445                                 skip=1;
 446
 447                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 448 #endif
 449                         s->init_num=0;
 450                         break;
 451
 452                 case SSL3_ST_SW_KEY_EXCH_A:
 453                 case SSL3_ST_SW_KEY_EXCH_B:
 454                         alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
 455
 456                         /*
 457                          * clear this, it may get reset by
 458                          * send_server_key_exchange
 459                          */
 460                         s->s3->tmp.use_rsa_tmp=0;
 461
 462
 463                         /* only send if a DH key exchange, fortezza or
 464                          * RSA but we have a sign only certificate
 465                          *
 466                          * PSK: may send PSK identity hints
 467                          *
 468                          * For ECC ciphersuites, we send a serverKeyExchange
 469                          * message only if the cipher suite is either
 470                          * ECDH-anon or ECDHE. In other cases, the
 471                          * server certificate contains the server's
 472                          * public key for key exchange.
 473                          */
 474                         if (0
 475                         /* PSK: send ServerKeyExchange if PSK identity
 476                          * hint if provided */
 477 #ifndef OPENSSL_NO_PSK
 478                             || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
 479 #endif
 480 #ifndef OPENSSL_NO_SRP
 481                             /* SRP: send ServerKeyExchange */
 482                             || (alg_k & SSL_kSRP)
 483 #endif
 484                             || (alg_k & SSL_kDHE)
 485                             || (alg_k & SSL_kECDHE)
 486                             || ((alg_k & SSL_kRSA)
 487                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
 488                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
 489                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
 490                                         )
 491                                     )
 492                                 )
 493                             )
 494                                 {
 495                                 ret=ssl3_send_server_key_exchange(s);
 496                                 if (ret <= 0) goto end;
 497                                 }
 498                         else
 499                                 skip=1;
 500
 501                         s->state=SSL3_ST_SW_CERT_REQ_A;
 502                         s->init_num=0;
 503                         break;
 504
 505                 case SSL3_ST_SW_CERT_REQ_A:
 506                 case SSL3_ST_SW_CERT_REQ_B:
 507                         if (/* don't request cert unless asked for it: */
 508                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
 509                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
 510                                  * don't request cert during re-negotiation: */
 511                                 ((s->session->peer != NULL) &&
 512                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
 513                                 /* never request cert in anonymous ciphersuites
 514                                  * (see section "Certificate request" in SSL 3 drafts
 515                                  * and in RFC 2246): */
 516                                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
 517                                  /* ... except when the application insists on verification
 518                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
 519                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
 520                                  /* never request cert in Kerberos ciphersuites */
 521                                 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5) ||
 522                                 /* don't request certificate for SRP auth */
 523                                 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aSRP)
 524                                 /* With normal PSK Certificates and
 525                                  * Certificate Requests are omitted */
 526                                 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 527                                 {
 528                                 /* no cert request */
 529                                 skip=1;
 530                                 s->s3->tmp.cert_request=0;
 531                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 532                                 if (s->s3->handshake_buffer)
 533                                         if (!ssl3_digest_cached_records(s))
 534                                                 return -1;
 535                                 }
 536                         else
 537                                 {
 538                                 s->s3->tmp.cert_request=1;
 539                                 ret=ssl3_send_certificate_request(s);
 540                                 if (ret <= 0) goto end;
 541 #ifndef NETSCAPE_HANG_BUG
 542                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 543 #else
 544                                 s->state=SSL3_ST_SW_FLUSH;
 545                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 546 #endif
 547                                 s->init_num=0;
 548                                 }
 549                         break;
 550
 551                 case SSL3_ST_SW_SRVR_DONE_A:
 552                 case SSL3_ST_SW_SRVR_DONE_B:
 553                         ret=ssl3_send_server_done(s);
 554                         if (ret <= 0) goto end;
 555                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 556                         s->state=SSL3_ST_SW_FLUSH;
 557                         s->init_num=0;
 558                         break;
 559
 560                 case SSL3_ST_SW_FLUSH:
 561
 562                         /* This code originally checked to see if
 563                          * any data was pending using BIO_CTRL_INFO
 564                          * and then flushed. This caused problems
 565                          * as documented in PR#1939. The proposed
 566                          * fix doesn't completely resolve this issue
 567                          * as buggy implementations of BIO_CTRL_PENDING
 568                          * still exist. So instead we just flush
 569                          * unconditionally.
 570                          */
 571
 572                         s->rwstate=SSL_WRITING;
 573                         if (BIO_flush(s->wbio) <= 0)
 574                                 {
 575                                 ret= -1;
 576                                 goto end;
 577                                 }
 578                         s->rwstate=SSL_NOTHING;
 579
 580                         s->state=s->s3->tmp.next_state;
 581                         break;
 582
 583                 case SSL3_ST_SR_CERT_A:
 584                 case SSL3_ST_SR_CERT_B:
 585                         if (s->s3->tmp.cert_request)
 586                                 {
 587                                 ret=ssl3_get_client_certificate(s);
 588                                 if (ret <= 0) goto end;
 589                                 }
 590                         s->init_num=0;
 591                         s->state=SSL3_ST_SR_KEY_EXCH_A;
 592                         break;
 593
 594                 case SSL3_ST_SR_KEY_EXCH_A:
 595                 case SSL3_ST_SR_KEY_EXCH_B:
 596                         ret=ssl3_get_client_key_exchange(s);
 597                         if (ret <= 0)
 598                                 goto end;
 599                         if (ret == 2)
 600                                 {
 601                                 /* For the ECDH ciphersuites when
 602                                  * the client sends its ECDH pub key in
 603                                  * a certificate, the CertificateVerify
 604                                  * message is not sent.
 605                                  * Also for GOST ciphersuites when
 606                                  * the client uses its key from the certificate
 607                                  * for key exchange.
 608                                  */
 609 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
 610                                 s->state=SSL3_ST_SR_FINISHED_A;
 611 #else
 612                                 if (s->s3->next_proto_neg_seen)
 613                                         s->state=SSL3_ST_SR_NEXT_PROTO_A;
 614                                 else
 615                                         s->state=SSL3_ST_SR_FINISHED_A;
 616 #endif
 617                                 s->init_num = 0;
 618                                 }
 619                         else if (SSL_USE_SIGALGS(s))
 620                                 {
 621                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
 622                                 s->init_num=0;
 623                                 if (!s->session->peer)
 624                                         break;
 625                                 /* For sigalgs freeze the handshake buffer
 626                                  * at this point and digest cached records.
 627                                  */
 628                                 if (!s->s3->handshake_buffer)
 629                                         {
 630                                         SSLerr(SSL_F_SSL3_ACCEPT,ERR_R_INTERNAL_ERROR);
 631                                         return -1;
 632                                         }
 633                                 s->s3->flags |= TLS1_FLAGS_KEEP_HANDSHAKE;
 634                                 if (!ssl3_digest_cached_records(s))
 635                                         return -1;
 636                                 }
 637                         else
 638                                 {
 639                                 int offset=0;
 640                                 int dgst_num;
 641
 642                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
 643                                 s->init_num=0;
 644
 645                                 /* We need to get hashes here so if there is
 646                                  * a client cert, it can be verified
 647                                  * FIXME - digest processing for CertificateVerify
 648                                  * should be generalized. But it is next step
 649                                  */
 650                                 if (s->s3->handshake_buffer)
 651                                         if (!ssl3_digest_cached_records(s))
 652                                                 return -1;
 653                                 for (dgst_num=0; dgst_num<SSL_MAX_DIGEST;dgst_num++)
 654                                         if (s->s3->handshake_dgst[dgst_num])
 655                                                 {
 656                                                 int dgst_size;
 657
 658                                                 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]));
 659                                                 dgst_size=EVP_MD_CTX_size(s->s3->handshake_dgst[dgst_num]);
 660                                                 if (dgst_size < 0)
 661                                                         {
 662                                                         ret = -1;
 663                                                         goto end;
 664                                                         }
 665                                                 offset+=dgst_size;
 666                                                 }
 667                                 }
 668                         break;
 669
 670                 case SSL3_ST_SR_CERT_VRFY_A:
 671                 case SSL3_ST_SR_CERT_VRFY_B:
 672                         /*
 673                          * This *should* be the first time we enable CCS, but be
 674                          * extra careful about surrounding code changes. We need
 675                          * to set this here because we don't know if we're
 676                          * expecting a CertificateVerify or not.
 677                          */
 678                         if (!s->s3->change_cipher_spec)
 679                                 s->s3->flags |= SSL3_FLAGS_CCS_OK;
 680                         /* we should decide if we expected this one */
 681                         ret=ssl3_get_cert_verify(s);
 682                         if (ret <= 0) goto end;
 683
 684 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
 685                         s->state=SSL3_ST_SR_FINISHED_A;
 686 #else
 687                         if (s->s3->next_proto_neg_seen)
 688                                 s->state=SSL3_ST_SR_NEXT_PROTO_A;
 689                         else
 690                                 s->state=SSL3_ST_SR_FINISHED_A;
 691 #endif
 692                         s->init_num=0;
 693                         break;
 694
 695 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
 696                 case SSL3_ST_SR_NEXT_PROTO_A:
 697                 case SSL3_ST_SR_NEXT_PROTO_B:
 698                         /*
 699                          * Enable CCS for resumed handshakes with NPN.
 700                          * In a full handshake with NPN, we end up here through
 701                          * SSL3_ST_SR_CERT_VRFY_B, where SSL3_FLAGS_CCS_OK was
 702                          * already set. Receiving a CCS clears the flag, so make
 703                          * sure not to re-enable it to ban duplicates.
 704                          * s->s3->change_cipher_spec is set when a CCS is
 705                          * processed in s3_pkt.c, and remains set until
 706                          * the client's Finished message is read.
 707                          */
 708                         if (!s->s3->change_cipher_spec)
 709                                 s->s3->flags |= SSL3_FLAGS_CCS_OK;
 710
 711                         ret=ssl3_get_next_proto(s);
 712                         if (ret <= 0) goto end;
 713                         s->init_num = 0;
 714                         s->state=SSL3_ST_SR_FINISHED_A;
 715                         break;
 716 #endif
 717
 718                 case SSL3_ST_SR_FINISHED_A:
 719                 case SSL3_ST_SR_FINISHED_B:
 720                         /*
 721                          * Enable CCS for resumed handshakes without NPN.
 722                          * In a full handshake, we end up here through
 723                          * SSL3_ST_SR_CERT_VRFY_B, where SSL3_FLAGS_CCS_OK was
 724                          * already set. Receiving a CCS clears the flag, so make
 725                          * sure not to re-enable it to ban duplicates.
 726                          * s->s3->change_cipher_spec is set when a CCS is
 727                          * processed in s3_pkt.c, and remains set until
 728                          * the client's Finished message is read.
 729                          */
 730                         if (!s->s3->change_cipher_spec)
 731                                 s->s3->flags |= SSL3_FLAGS_CCS_OK;
 732                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
 733                                 SSL3_ST_SR_FINISHED_B);
 734                         if (ret <= 0) goto end;
 735                         if (s->hit)
 736                                 s->state=SSL_ST_OK;
 737 #ifndef OPENSSL_NO_TLSEXT
 738                         else if (s->tlsext_ticket_expected)
 739                                 s->state=SSL3_ST_SW_SESSION_TICKET_A;
 740 #endif
 741                         else
 742                                 s->state=SSL3_ST_SW_CHANGE_A;
 743                         s->init_num=0;
 744                         break;
 745
 746 #ifndef OPENSSL_NO_TLSEXT
 747                 case SSL3_ST_SW_SESSION_TICKET_A:
 748                 case SSL3_ST_SW_SESSION_TICKET_B:
 749                         ret=ssl3_send_newsession_ticket(s);
 750                         if (ret <= 0) goto end;
 751                         s->state=SSL3_ST_SW_CHANGE_A;
 752                         s->init_num=0;
 753                         break;
 754
 755                 case SSL3_ST_SW_CERT_STATUS_A:
 756                 case SSL3_ST_SW_CERT_STATUS_B:
 757                         ret=ssl3_send_cert_status(s);
 758                         if (ret <= 0) goto end;
 759                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 760                         s->init_num=0;
 761                         break;
 762
 763 #endif
 764
 765                 case SSL3_ST_SW_CHANGE_A:
 766                 case SSL3_ST_SW_CHANGE_B:
 767
 768                         s->session->cipher=s->s3->tmp.new_cipher;
 769                         if (!s->method->ssl3_enc->setup_key_block(s))
 770                                 { ret= -1; goto end; }
 771
 772                         ret=ssl3_send_change_cipher_spec(s,
 773                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
 774
 775                         if (ret <= 0) goto end;
 776                         s->state=SSL3_ST_SW_FINISHED_A;
 777                         s->init_num=0;
 778
 779                         if (!s->method->ssl3_enc->change_cipher_state(s,
 780                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
 781                                 {
 782                                 ret= -1;
 783                                 goto end;
 784                                 }
 785
 786                         break;
 787
 788                 case SSL3_ST_SW_FINISHED_A:
 789                 case SSL3_ST_SW_FINISHED_B:
 790                         ret=ssl3_send_finished(s,
 791                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
 792                                 s->method->ssl3_enc->server_finished_label,
 793                                 s->method->ssl3_enc->server_finished_label_len);
 794                         if (ret <= 0) goto end;
 795                         s->state=SSL3_ST_SW_FLUSH;
 796                         if (s->hit)
 797                                 {
 798 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
 799                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 800 #else
 801                                 if (s->s3->next_proto_neg_seen)
 802                                         {
 803                                         s->s3->tmp.next_state=SSL3_ST_SR_NEXT_PROTO_A;
 804                                         }
 805                                 else
 806                                         s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 807 #endif
 808                                 }
 809                         else
 810                                 s->s3->tmp.next_state=SSL_ST_OK;
 811                         s->init_num=0;
 812                         break;
 813
 814                 case SSL_ST_OK:
 815                         /* clean a few things up */
 816                         ssl3_cleanup_key_block(s);
 817
 818                         BUF_MEM_free(s->init_buf);
 819                         s->init_buf=NULL;
 820
 821                         /* remove buffering on output */
 822                         ssl_free_wbio_buffer(s);
 823
 824                         s->init_num=0;
 825
 826                         if (s->renegotiate == 2) /* skipped if we just sent a HelloRequest */
 827                                 {
 828                                 s->renegotiate=0;
 829                                 s->new_session=0;
 830
 831                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 832
 833                                 s->ctx->stats.sess_accept_good++;
 834                                 /* s->server=1; */
 835                                 s->handshake_func=ssl3_accept;
 836
 837                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 838                                 }
 839
 840                         ret = 1;
 841                         goto end;
 842                         /* break; */
 843
 844                 default:
 845                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
 846                         ret= -1;
 847                         goto end;
 848                         /* break; */
 849                         }
 850
 851                 if (!s->s3->tmp.reuse_message && !skip)
 852                         {
 853                         if (s->debug)
 854                                 {
 855                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 856                                         goto end;
 857                                 }
 858
 859
 860                         if ((cb != NULL) && (s->state != state))
 861                                 {
 862                                 new_state=s->state;
 863                                 s->state=state;
 864                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
 865                                 s->state=new_state;
 866                                 }
 867                         }
 868                 skip=0;
 869                 }
 870 end:
 871         /* BIO_flush(s->wbio); */
 872
 873         s->in_handshake--;
 874         if (cb != NULL)
 875                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 876         return(ret);
 877         }
 878
 879 int ssl3_send_hello_request(SSL *s)
 880         {
 881
 882         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
 883                 {
 884                 ssl_set_handshake_header(s, SSL3_MT_HELLO_REQUEST, 0);
 885                 s->state=SSL3_ST_SW_HELLO_REQ_B;
 886                 }
 887
 888         /* SSL3_ST_SW_HELLO_REQ_B */
 889         return ssl_do_write(s);
 890         }
 891
 892 int ssl3_get_client_hello(SSL *s)
 893         {
 894         int i,j,ok,al=SSL_AD_INTERNAL_ERROR,ret= -1;
 895         unsigned int cookie_len;
 896         long n;
 897         unsigned long id;
 898         unsigned char *p,*d;
 899         SSL_CIPHER *c;
 900 #ifndef OPENSSL_NO_COMP
 901         unsigned char *q;
 902         SSL_COMP *comp=NULL;
 903 #endif
 904         STACK_OF(SSL_CIPHER) *ciphers=NULL;
 905
 906         if (s->state == SSL3_ST_SR_CLNT_HELLO_C && !s->first_packet)
 907                 goto retry_cert;
 908
 909         /* We do this so that we will respond with our native type.
 910          * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
 911          * This down switching should be handled by a different method.
 912          * If we are SSLv3, we will respond with SSLv3, even if prompted with
 913          * TLSv1.
 914          */
 915         if (s->state == SSL3_ST_SR_CLNT_HELLO_A
 916                 )
 917                 {
 918                 s->state=SSL3_ST_SR_CLNT_HELLO_B;
 919                 }
 920         s->first_packet=1;
 921         n=s->method->ssl_get_message(s,
 922                 SSL3_ST_SR_CLNT_HELLO_B,
 923                 SSL3_ST_SR_CLNT_HELLO_C,
 924                 SSL3_MT_CLIENT_HELLO,
 925                 SSL3_RT_MAX_PLAIN_LENGTH,
 926                 &ok);
 927
 928         if (!ok) return((int)n);
 929         s->first_packet=0;
 930         d=p=(unsigned char *)s->init_msg;
 931
 932         /* use version from inside client hello, not from record header
 933          * (may differ: see RFC 2246, Appendix E, second paragraph) */
 934         s->client_version=(((int)p[0])<<8)|(int)p[1];
 935         p+=2;
 936
 937         if (SSL_IS_DTLS(s)  ?   (s->client_version > s->version &&
 938                                  s->method->version != DTLS_ANY_VERSION)
 939                             :   (s->client_version < s->version))
 940                 {
 941                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER);
 942                 if ((s->client_version>>8) == SSL3_VERSION_MAJOR &&
 943                         !s->enc_write_ctx && !s->write_hash)
 944                         {
 945                         /* similar to ssl3_get_record, send alert using remote version number */
 946                         s->version = s->client_version;
 947                         }
 948                 al = SSL_AD_PROTOCOL_VERSION;
 949                 goto f_err;
 950                 }
 951
 952         /* If we require cookies and this ClientHello doesn't
 953          * contain one, just return since we do not want to
 954          * allocate any memory yet. So check cookie length...
 955          */
 956         if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)
 957                 {
 958                 unsigned int session_length, cookie_length;
 959
 960                 session_length = *(p + SSL3_RANDOM_SIZE);
 961                 cookie_length = *(p + SSL3_RANDOM_SIZE + session_length + 1);
 962
 963                 if (cookie_length == 0)
 964                         return 1;
 965                 }
 966
 967         /* load the client random */
 968         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
 969         p+=SSL3_RANDOM_SIZE;
 970
 971         /* get the session-id */
 972         j= *(p++);
 973
 974         s->hit=0;
 975         /* Versions before 0.9.7 always allow clients to resume sessions in renegotiation.
 976          * 0.9.7 and later allow this by default, but optionally ignore resumption requests
 977          * with flag SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION (it's a new flag rather
 978          * than a change to default behavior so that applications relying on this for security
 979          * won't even compile against older library versions).
 980          *
 981          * 1.0.1 and later also have a function SSL_renegotiate_abbreviated() to request
 982          * renegotiation but not a new session (s->new_session remains unset): for servers,
 983          * this essentially just means that the SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
 984          * setting will be ignored.
 985          */
 986         if ((s->new_session && (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION)))
 987                 {
 988                 if (!ssl_get_new_session(s,1))
 989                         goto err;
 990                 }
 991         else
 992                 {
 993                 i=ssl_get_prev_session(s, p, j, d + n);
 994                 /*
 995                  * Only resume if the session's version matches the negotiated
 996                  * version.
 997                  * RFC 5246 does not provide much useful advice on resumption
 998                  * with a different protocol version. It doesn't forbid it but
 999                  * the sanity of such behaviour would be questionable.
1000                  * In practice, clients do not accept a version mismatch and
1001                  * will abort the handshake with an error.
1002                  */
1003                 if (i == 1 && s->version == s->session->ssl_version)
1004                         { /* previous session */
1005                         s->hit=1;
1006                         }
1007                 else if (i == -1)
1008                         goto err;
1009                 else /* i == 0 */
1010                         {
1011                         if (!ssl_get_new_session(s,1))
1012                                 goto err;
1013                         }
1014                 }
1015
1016         p+=j;
1017
1018         if (SSL_IS_DTLS(s))
1019                 {
1020                 /* cookie stuff */
1021                 cookie_len = *(p++);
1022
1023                 /*
1024                  * The ClientHello may contain a cookie even if the
1025                  * HelloVerify message has not been sent--make sure that it
1026                  * does not cause an overflow.
1027                  */
1028                 if ( cookie_len > sizeof(s->d1->rcvd_cookie))
1029                         {
1030                         /* too much data */
1031                         al = SSL_AD_DECODE_ERROR;
1032                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
1033                         goto f_err;
1034                         }
1035
1036                 /* verify the cookie if appropriate option is set. */
1037                 if ((SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) &&
1038                         cookie_len > 0)
1039                         {
1040                         memcpy(s->d1->rcvd_cookie, p, cookie_len);
1041
1042                         if ( s->ctx->app_verify_cookie_cb != NULL)
1043                                 {
1044                                 if ( s->ctx->app_verify_cookie_cb(s, s->d1->rcvd_cookie,
1045                                         cookie_len) == 0)
1046                                         {
1047                                         al=SSL_AD_HANDSHAKE_FAILURE;
1048                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
1049                                                 SSL_R_COOKIE_MISMATCH);
1050                                         goto f_err;
1051                                         }
1052                                 /* else cookie verification succeeded */
1053                                 }
1054                         /* default verification */
1055                         else if ( memcmp(s->d1->rcvd_cookie, s->d1->cookie,
1056                                                   s->d1->cookie_len) != 0)
1057                                 {
1058                                         al=SSL_AD_HANDSHAKE_FAILURE;
1059                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
1060                                                 SSL_R_COOKIE_MISMATCH);
1061                                         goto f_err;
1062                                 }
1063                         /* Set to -2 so if successful we return 2 */
1064                         ret = -2;
1065                         }
1066
1067                 p += cookie_len;
1068                 if (s->method->version == DTLS_ANY_VERSION)
1069                         {
1070                         /* Select version to use */
1071                         if (s->client_version <= DTLS1_2_VERSION &&
1072                                 !(s->options & SSL_OP_NO_DTLSv1_2))
1073                                 {
1074                                 s->version = DTLS1_2_VERSION;
1075                                 s->method = DTLSv1_2_server_method();
1076                                 }
1077                         else if (tls1_suiteb(s))
1078                                 {
1079                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_ONLY_DTLS_1_2_ALLOWED_IN_SUITEB_MODE);
1080                                 s->version = s->client_version;
1081                                 al = SSL_AD_PROTOCOL_VERSION;
1082                                 goto f_err;
1083                                 }
1084                         else if (s->client_version <= DTLS1_VERSION &&
1085                                 !(s->options & SSL_OP_NO_DTLSv1))
1086                                 {
1087                                 s->version = DTLS1_VERSION;
1088                                 s->method = DTLSv1_server_method();
1089                                 }
1090                         else
1091                                 {
1092                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER);
1093                                 s->version = s->client_version;
1094                                 al = SSL_AD_PROTOCOL_VERSION;
1095                                 goto f_err;
1096                                 }
1097                         s->session->ssl_version = s->version;
1098                         }
1099                 }
1100
1101         n2s(p,i);
1102         if ((i == 0) && (j != 0))
1103                 {
1104                 /* we need a cipher if we are not resuming a session */
1105                 al=SSL_AD_ILLEGAL_PARAMETER;
1106                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
1107                 goto f_err;
1108                 }
1109         if ((p+i) >= (d+n))
1110                 {
1111                 /* not enough data */
1112                 al=SSL_AD_DECODE_ERROR;
1113                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
1114                 goto f_err;
1115                 }
1116         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
1117                 == NULL))
1118                 {
1119                 goto err;
1120                 }
1121         p+=i;
1122
1123         /* If it is a hit, check that the cipher is in the list */
1124         if ((s->hit) && (i > 0))
1125                 {
1126                 j=0;
1127                 id=s->session->cipher->id;
1128
1129 #ifdef CIPHER_DEBUG
1130                 fprintf(stderr,"client sent %d ciphers\n",sk_SSL_CIPHER_num(ciphers));
1131 #endif
1132                 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
1133                         {
1134                         c=sk_SSL_CIPHER_value(ciphers,i);
1135 #ifdef CIPHER_DEBUG
1136                         fprintf(stderr,"client [%2d of %2d]:%s\n",
1137                                 i,sk_SSL_CIPHER_num(ciphers),
1138                                 SSL_CIPHER_get_name(c));
1139 #endif
1140                         if (c->id == id)
1141                                 {
1142                                 j=1;
1143                                 break;
1144                                 }
1145                         }
1146 /* Disabled because it can be used in a ciphersuite downgrade
1147  * attack: CVE-2010-4180.
1148  */
1149 #if 0
1150                 if (j == 0 && (s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
1151                         {
1152                         /* Special case as client bug workaround: the previously used cipher may
1153                          * not be in the current list, the client instead might be trying to
1154                          * continue using a cipher that before wasn't chosen due to server
1155                          * preferences.  We'll have to reject the connection if the cipher is not
1156                          * enabled, though. */
1157                         c = sk_SSL_CIPHER_value(ciphers, 0);
1158                         if (sk_SSL_CIPHER_find(SSL_get_ciphers(s), c) >= 0)
1159                                 {
1160                                 s->session->cipher = c;
1161                                 j = 1;
1162                                 }
1163                         }
1164 #endif
1165                 if (j == 0)
1166                         {
1167                         /* we need to have the cipher in the cipher
1168                          * list if we are asked to reuse it */
1169                         al=SSL_AD_ILLEGAL_PARAMETER;
1170                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
1171                         goto f_err;
1172                         }
1173                 }
1174
1175         /* compression */
1176         i= *(p++);
1177         if ((p+i) > (d+n))
1178                 {
1179                 /* not enough data */
1180                 al=SSL_AD_DECODE_ERROR;
1181                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
1182                 goto f_err;
1183                 }
1184 #ifndef OPENSSL_NO_COMP
1185         q=p;
1186 #endif
1187         for (j=0; j<i; j++)
1188                 {
1189                 if (p[j] == 0) break;
1190                 }
1191
1192         p+=i;
1193         if (j >= i)
1194                 {
1195                 /* no compress */
1196                 al=SSL_AD_DECODE_ERROR;
1197                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
1198                 goto f_err;
1199                 }
1200
1201 #ifndef OPENSSL_NO_TLSEXT
1202         /* TLS extensions*/
1203         if (s->version >= SSL3_VERSION)
1204                 {
1205                 if (!ssl_parse_clienthello_tlsext(s,&p,d,n))
1206                         {
1207                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_PARSE_TLSEXT);
1208                         goto err;
1209                         }
1210                 }
1211
1212         /* Check if we want to use external pre-shared secret for this
1213          * handshake for not reused session only. We need to generate
1214          * server_random before calling tls_session_secret_cb in order to allow
1215          * SessionTicket processing to use it in key derivation. */
1216         {
1217                 unsigned char *pos;
1218                 pos=s->s3->server_random;
1219                 if (ssl_fill_hello_random(s, 1, pos, SSL3_RANDOM_SIZE) <= 0)
1220                         {
1221                         goto f_err;
1222                         }
1223         }
1224
1225         if (!s->hit && s->version >= TLS1_VERSION && s->tls_session_secret_cb)
1226                 {
1227                 SSL_CIPHER *pref_cipher=NULL;
1228
1229                 s->session->master_key_length=sizeof(s->session->master_key);
1230                 if(s->tls_session_secret_cb(s, s->session->master_key, &s->session->master_key_length,
1231                         ciphers, &pref_cipher, s->tls_session_secret_cb_arg))
1232                         {
1233                         s->hit=1;
1234                         s->session->ciphers=ciphers;
1235                         s->session->verify_result=X509_V_OK;
1236
1237                         ciphers=NULL;
1238
1239                         /* check if some cipher was preferred by call back */
1240                         pref_cipher=pref_cipher ? pref_cipher : ssl3_choose_cipher(s, s->session->ciphers, SSL_get_ciphers(s));
1241                         if (pref_cipher == NULL)
1242                                 {
1243                                 al=SSL_AD_HANDSHAKE_FAILURE;
1244                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1245                                 goto f_err;
1246                                 }
1247
1248                         s->session->cipher=pref_cipher;
1249
1250                         if (s->cipher_list)
1251                                 sk_SSL_CIPHER_free(s->cipher_list);
1252
1253                         if (s->cipher_list_by_id)
1254                                 sk_SSL_CIPHER_free(s->cipher_list_by_id);
1255
1256                         s->cipher_list = sk_SSL_CIPHER_dup(s->session->ciphers);
1257                         s->cipher_list_by_id = sk_SSL_CIPHER_dup(s->session->ciphers);
1258                         }
1259                 }
1260 #endif
1261
1262         /* Worst case, we will use the NULL compression, but if we have other
1263          * options, we will now look for them.  We have i-1 compression
1264          * algorithms from the client, starting at q. */
1265         s->s3->tmp.new_compression=NULL;
1266 #ifndef OPENSSL_NO_COMP
1267         /* This only happens if we have a cache hit */
1268         if (s->session->compress_meth != 0)
1269                 {
1270                 int m, comp_id = s->session->compress_meth;
1271                 /* Perform sanity checks on resumed compression algorithm */
1272                 /* Can't disable compression */
1273                 if (!ssl_allow_compression(s))
1274                         {
1275                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1276                         goto f_err;
1277                         }
1278                 /* Look for resumed compression method */
1279                 for (m = 0; m < sk_SSL_COMP_num(s->ctx->comp_methods); m++)
1280                         {
1281                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1282                         if (comp_id == comp->id)
1283                                 {
1284                                 s->s3->tmp.new_compression=comp;
1285                                 break;
1286                                 }
1287                         }
1288                 if (s->s3->tmp.new_compression == NULL)
1289                         {
1290                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INVALID_COMPRESSION_ALGORITHM);
1291                         goto f_err;
1292                         }
1293                 /* Look for resumed method in compression list */
1294                 for (m = 0; m < i; m++)
1295                         {
1296                         if (q[m] == comp_id)
1297                                 break;
1298                         }
1299                 if (m >= i)
1300                         {
1301                         al=SSL_AD_ILLEGAL_PARAMETER;
1302                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_COMPRESSSION_ALGORITHM_MISSING);
1303                         goto f_err;
1304                         }
1305                 }
1306         else if (s->hit)
1307                 comp = NULL;
1308         else if (ssl_allow_compression(s) && s->ctx->comp_methods)
1309                 { /* See if we have a match */
1310                 int m,nn,o,v,done=0;
1311
1312                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
1313                 for (m=0; m<nn; m++)
1314                         {
1315                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1316                         v=comp->id;
1317                         for (o=0; o<i; o++)
1318                                 {
1319                                 if (v == q[o])
1320                                         {
1321                                         done=1;
1322                                         break;
1323                                         }
1324                                 }
1325                         if (done) break;
1326                         }
1327                 if (done)
1328                         s->s3->tmp.new_compression=comp;
1329                 else
1330                         comp=NULL;
1331                 }
1332 #else
1333         /* If compression is disabled we'd better not try to resume a session
1334          * using compression.
1335          */
1336         if (s->session->compress_meth != 0)
1337                 {
1338                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1339                 goto f_err;
1340                 }
1341 #endif
1342
1343         /* Given s->session->ciphers and SSL_get_ciphers, we must
1344          * pick a cipher */
1345
1346         if (!s->hit)
1347                 {
1348 #ifdef OPENSSL_NO_COMP
1349                 s->session->compress_meth=0;
1350 #else
1351                 s->session->compress_meth=(comp == NULL)?0:comp->id;
1352 #endif
1353                 if (s->session->ciphers != NULL)
1354                         sk_SSL_CIPHER_free(s->session->ciphers);
1355                 s->session->ciphers=ciphers;
1356                 if (ciphers == NULL)
1357                         {
1358                         al=SSL_AD_ILLEGAL_PARAMETER;
1359                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
1360                         goto f_err;
1361                         }
1362                 ciphers=NULL;
1363                 if (!tls1_set_server_sigalgs(s))
1364                         {
1365                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT);
1366                         goto err;
1367                         }
1368                 /* Let cert callback update server certificates if required */
1369                 retry_cert:
1370                 if (s->cert->cert_cb)
1371                         {
1372                         int rv = s->cert->cert_cb(s, s->cert->cert_cb_arg);
1373                         if (rv == 0)
1374                                 {
1375                                 al=SSL_AD_INTERNAL_ERROR;
1376                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_CERT_CB_ERROR);
1377                                 goto f_err;
1378                                 }
1379                         if (rv < 0)
1380                                 {
1381                                 s->rwstate=SSL_X509_LOOKUP;
1382                                 return -1;
1383                                 }
1384                         s->rwstate = SSL_NOTHING;
1385                         }
1386                 c=ssl3_choose_cipher(s,s->session->ciphers,
1387                                      SSL_get_ciphers(s));
1388
1389                 if (c == NULL)
1390                         {
1391                         al=SSL_AD_HANDSHAKE_FAILURE;
1392                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1393                         goto f_err;
1394                         }
1395                 s->s3->tmp.new_cipher=c;
1396                 /* check whether we should disable session resumption */
1397                 if (s->not_resumable_session_cb != NULL)
1398                         s->session->not_resumable=s->not_resumable_session_cb(s,
1399                                 ((c->algorithm_mkey & (SSL_kDHE | SSL_kECDHE)) != 0));
1400                 if (s->session->not_resumable)
1401                         /* do not send a session ticket */
1402                         s->tlsext_ticket_expected = 0;
1403                 }
1404         else
1405                 {
1406                 /* Session-id reuse */
1407 #ifdef REUSE_CIPHER_BUG
1408                 STACK_OF(SSL_CIPHER) *sk;
1409                 SSL_CIPHER *nc=NULL;
1410                 SSL_CIPHER *ec=NULL;
1411
1412                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
1413                         {
1414                         sk=s->session->ciphers;
1415                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
1416                                 {
1417                                 c=sk_SSL_CIPHER_value(sk,i);
1418                                 if (c->algorithm_enc & SSL_eNULL)
1419                                         nc=c;
1420                                 if (SSL_C_IS_EXPORT(c))
1421                                         ec=c;
1422                                 }
1423                         if (nc != NULL)
1424                                 s->s3->tmp.new_cipher=nc;
1425                         else if (ec != NULL)
1426                                 s->s3->tmp.new_cipher=ec;
1427                         else
1428                                 s->s3->tmp.new_cipher=s->session->cipher;
1429                         }
1430                 else
1431 #endif
1432                 s->s3->tmp.new_cipher=s->session->cipher;
1433                 }
1434
1435         if (!SSL_USE_SIGALGS(s) || !(s->verify_mode & SSL_VERIFY_PEER))
1436                 {
1437                 if (!ssl3_digest_cached_records(s))
1438                         goto f_err;
1439                 }
1440
1441         /*-
1442          * we now have the following setup.
1443          * client_random
1444          * cipher_list          - our prefered list of ciphers
1445          * ciphers              - the clients prefered list of ciphers
1446          * compression          - basically ignored right now
1447          * ssl version is set   - sslv3
1448          * s->session           - The ssl session has been setup.
1449          * s->hit               - session reuse flag
1450          * s->s3->tmp.new_cipher- the new cipher to use.
1451          */
1452
1453         /* Handles TLS extensions that we couldn't check earlier */
1454         if (s->version >= SSL3_VERSION)
1455                 {
1456                 if (ssl_check_clienthello_tlsext_late(s) <= 0)
1457                         {
1458                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT);
1459                         goto err;
1460                         }
1461                 }
1462
1463         if (ret < 0) ret=-ret;
1464         if (0)
1465                 {
1466 f_err:
1467                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1468                 }
1469 err:
1470         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
1471         return ret < 0 ? -1 : ret;
1472         }
1473
1474 int ssl3_send_server_hello(SSL *s)
1475         {
1476         unsigned char *buf;
1477         unsigned char *p,*d;
1478         int i,sl;
1479         int al = 0;
1480         unsigned long l;
1481
1482         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
1483                 {
1484                 buf=(unsigned char *)s->init_buf->data;
1485 #ifdef OPENSSL_NO_TLSEXT
1486                 p=s->s3->server_random;
1487                 if (ssl_fill_hello_random(s, 1, p, SSL3_RANDOM_SIZE) <= 0)
1488                         return -1;
1489 #endif
1490                 /* Do the message type and length last */
1491                 d=p= ssl_handshake_start(s);
1492
1493                 *(p++)=s->version>>8;
1494                 *(p++)=s->version&0xff;
1495
1496                 /* Random stuff */
1497                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
1498                 p+=SSL3_RANDOM_SIZE;
1499
1500                 /*-
1501                  * There are several cases for the session ID to send
1502                  * back in the server hello:
1503                  * - For session reuse from the session cache,
1504                  *   we send back the old session ID.
1505                  * - If stateless session reuse (using a session ticket)
1506                  *   is successful, we send back the client's "session ID"
1507                  *   (which doesn't actually identify the session).
1508                  * - If it is a new session, we send back the new
1509                  *   session ID.
1510                  * - However, if we want the new session to be single-use,
1511                  *   we send back a 0-length session ID.
1512                  * s->hit is non-zero in either case of session reuse,
1513                  * so the following won't overwrite an ID that we're supposed
1514                  * to send back.
1515                  */
1516                 if (s->session->not_resumable ||
1517                         (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)
1518                                 && !s->hit))
1519                         s->session->session_id_length=0;
1520
1521                 sl=s->session->session_id_length;
1522                 if (sl > (int)sizeof(s->session->session_id))
1523                         {
1524                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1525                         return -1;
1526                         }
1527                 *(p++)=sl;
1528                 memcpy(p,s->session->session_id,sl);
1529                 p+=sl;
1530
1531                 /* put the cipher */
1532                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
1533                 p+=i;
1534
1535                 /* put the compression method */
1536 #ifdef OPENSSL_NO_COMP
1537                         *(p++)=0;
1538 #else
1539                 if (s->s3->tmp.new_compression == NULL)
1540                         *(p++)=0;
1541                 else
1542                         *(p++)=s->s3->tmp.new_compression->id;
1543 #endif
1544 #ifndef OPENSSL_NO_TLSEXT
1545                 if (ssl_prepare_serverhello_tlsext(s) <= 0)
1546                         {
1547                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
1548                         return -1;
1549                         }
1550                 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH, &al)) == NULL)
1551                         {
1552                         ssl3_send_alert(s, SSL3_AL_FATAL, al);
1553                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
1554                         return -1;
1555                         }
1556 #endif
1557                 /* do the header */
1558                 l=(p-d);
1559                 ssl_set_handshake_header(s, SSL3_MT_SERVER_HELLO, l);
1560                 s->state=SSL3_ST_SW_SRVR_HELLO_B;
1561                 }
1562
1563         /* SSL3_ST_SW_SRVR_HELLO_B */
1564         return ssl_do_write(s);
1565         }
1566
1567 int ssl3_send_server_done(SSL *s)
1568         {
1569
1570         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1571                 {
1572                 ssl_set_handshake_header(s, SSL3_MT_SERVER_DONE, 0);
1573                 s->state = SSL3_ST_SW_SRVR_DONE_B;
1574                 }
1575
1576         /* SSL3_ST_SW_SRVR_DONE_B */
1577         return ssl_do_write(s);
1578         }
1579
1580 int ssl3_send_server_key_exchange(SSL *s)
1581         {
1582 #ifndef OPENSSL_NO_RSA
1583         unsigned char *q;
1584         int j,num;
1585         RSA *rsa;
1586         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1587         unsigned int u;
1588 #endif
1589 #ifndef OPENSSL_NO_DH
1590         DH *dh=NULL,*dhp;
1591 #endif
1592 #ifndef OPENSSL_NO_ECDH
1593         EC_KEY *ecdh=NULL, *ecdhp;
1594         unsigned char *encodedPoint = NULL;
1595         int encodedlen = 0;
1596         int curve_id = 0;
1597         BN_CTX *bn_ctx = NULL;
1598 #endif
1599         EVP_PKEY *pkey;
1600         const EVP_MD *md = NULL;
1601         unsigned char *p,*d;
1602         int al,i;
1603         unsigned long type;
1604         int n;
1605         CERT *cert;
1606         BIGNUM *r[4];
1607         int nr[4],kn;
1608         BUF_MEM *buf;
1609         EVP_MD_CTX md_ctx;
1610
1611         EVP_MD_CTX_init(&md_ctx);
1612         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1613                 {
1614                 type=s->s3->tmp.new_cipher->algorithm_mkey;
1615                 cert=s->cert;
1616
1617                 buf=s->init_buf;
1618
1619                 r[0]=r[1]=r[2]=r[3]=NULL;
1620                 n=0;
1621 #ifndef OPENSSL_NO_RSA
1622                 if (type & SSL_kRSA)
1623                         {
1624                         rsa=cert->rsa_tmp;
1625                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1626                                 {
1627                                 rsa=s->cert->rsa_tmp_cb(s,
1628                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1629                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1630                                 if(rsa == NULL)
1631                                 {
1632                                         al=SSL_AD_HANDSHAKE_FAILURE;
1633                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1634                                         goto f_err;
1635                                 }
1636                                 RSA_up_ref(rsa);
1637                                 cert->rsa_tmp=rsa;
1638                                 }
1639                         if (rsa == NULL)
1640                                 {
1641                                 al=SSL_AD_HANDSHAKE_FAILURE;
1642                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1643                                 goto f_err;
1644                                 }
1645                         r[0]=rsa->n;
1646                         r[1]=rsa->e;
1647                         s->s3->tmp.use_rsa_tmp=1;
1648                         }
1649                 else
1650 #endif
1651 #ifndef OPENSSL_NO_DH
1652                         if (type & SSL_kDHE)
1653                         {
1654                         if (s->cert->dh_tmp_auto)
1655                                 {
1656                                 dhp = ssl_get_auto_dh(s);
1657                                 if (dhp == NULL)
1658                                         {
1659                                         al=SSL_AD_INTERNAL_ERROR;
1660                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1661                                         goto f_err;
1662                                         }
1663                                 }
1664                         else
1665                                 dhp=cert->dh_tmp;
1666                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1667                                 dhp=s->cert->dh_tmp_cb(s,
1668                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1669                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1670                         if (dhp == NULL)
1671                                 {
1672                                 al=SSL_AD_HANDSHAKE_FAILURE;
1673                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1674                                 goto f_err;
1675                                 }
1676                         if (!ssl_security(s, SSL_SECOP_TMP_DH,
1677                                                 DH_security_bits(dhp), 0, dhp))
1678                                 {
1679                                 al=SSL_AD_HANDSHAKE_FAILURE;
1680                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_DH_KEY_TOO_SMALL);
1681                                 goto f_err;
1682                                 }
1683                         if (s->s3->tmp.dh != NULL)
1684                                 {
1685                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1686                                 goto err;
1687                                 }
1688
1689                         if (s->cert->dh_tmp_auto)
1690                                 dh = dhp;
1691                         else if ((dh=DHparams_dup(dhp)) == NULL)
1692                                 {
1693                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1694                                 goto err;
1695                                 }
1696
1697                         s->s3->tmp.dh=dh;
1698                         if ((dhp->pub_key == NULL ||
1699                              dhp->priv_key == NULL ||
1700                              (s->options & SSL_OP_SINGLE_DH_USE)))
1701                                 {
1702                                 if(!DH_generate_key(dh))
1703                                     {
1704                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1705                                            ERR_R_DH_LIB);
1706                                     goto err;
1707                                     }
1708                                 }
1709                         else
1710                                 {
1711                                 dh->pub_key=BN_dup(dhp->pub_key);
1712                                 dh->priv_key=BN_dup(dhp->priv_key);
1713                                 if ((dh->pub_key == NULL) ||
1714                                         (dh->priv_key == NULL))
1715                                         {
1716                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1717                                         goto err;
1718                                         }
1719                                 }
1720                         r[0]=dh->p;
1721                         r[1]=dh->g;
1722                         r[2]=dh->pub_key;
1723                         }
1724                 else
1725 #endif
1726 #ifndef OPENSSL_NO_ECDH
1727                         if (type & SSL_kECDHE)
1728                         {
1729                         const EC_GROUP *group;
1730
1731                         ecdhp=cert->ecdh_tmp;
1732                         if (s->cert->ecdh_tmp_auto)
1733                                 {
1734                                 /* Get NID of appropriate shared curve */
1735                                 int nid = tls1_shared_curve(s, -2);
1736                                 if (nid != NID_undef)
1737                                         ecdhp = EC_KEY_new_by_curve_name(nid);
1738                                 }
1739                         else if ((ecdhp == NULL) && s->cert->ecdh_tmp_cb)
1740                                 {
1741                                 ecdhp=s->cert->ecdh_tmp_cb(s,
1742                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1743                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1744                                 }
1745                         if (ecdhp == NULL)
1746                                 {
1747                                 al=SSL_AD_HANDSHAKE_FAILURE;
1748                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1749                                 goto f_err;
1750                                 }
1751
1752                         if (s->s3->tmp.ecdh != NULL)
1753                                 {
1754                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1755                                 goto err;
1756                                 }
1757
1758                         /* Duplicate the ECDH structure. */
1759                         if (ecdhp == NULL)
1760                                 {
1761                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1762                                 goto err;
1763                                 }
1764                         if (s->cert->ecdh_tmp_auto)
1765                                 ecdh = ecdhp;
1766                         else if ((ecdh = EC_KEY_dup(ecdhp)) == NULL)
1767                                 {
1768                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1769                                 goto err;
1770                                 }
1771
1772                         s->s3->tmp.ecdh=ecdh;
1773                         if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1774                             (EC_KEY_get0_private_key(ecdh) == NULL) ||
1775                             (s->options & SSL_OP_SINGLE_ECDH_USE))
1776                                 {
1777                                 if(!EC_KEY_generate_key(ecdh))
1778                                     {
1779                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1780                                     goto err;
1781                                     }
1782                                 }
1783
1784                         if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1785                             (EC_KEY_get0_public_key(ecdh)  == NULL) ||
1786                             (EC_KEY_get0_private_key(ecdh) == NULL))
1787                                 {
1788                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1789                                 goto err;
1790                                 }
1791
1792                         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1793                             (EC_GROUP_get_degree(group) > 163))
1794                                 {
1795                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1796                                 goto err;
1797                                 }
1798
1799                         /* XXX: For now, we only support ephemeral ECDH
1800                          * keys over named (not generic) curves. For
1801                          * supported named curves, curve_id is non-zero.
1802                          */
1803                         if ((curve_id =
1804                             tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1805                             == 0)
1806                                 {
1807                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1808                                 goto err;
1809                                 }
1810
1811                         /* Encode the public key.
1812                          * First check the size of encoding and
1813                          * allocate memory accordingly.
1814                          */
1815                         encodedlen = EC_POINT_point2oct(group,
1816                             EC_KEY_get0_public_key(ecdh),
1817                             POINT_CONVERSION_UNCOMPRESSED,
1818                             NULL, 0, NULL);
1819
1820                         encodedPoint = (unsigned char *)
1821                             OPENSSL_malloc(encodedlen*sizeof(unsigned char));
1822                         bn_ctx = BN_CTX_new();
1823                         if ((encodedPoint == NULL) || (bn_ctx == NULL))
1824                                 {
1825                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1826                                 goto err;
1827                                 }
1828
1829
1830                         encodedlen = EC_POINT_point2oct(group,
1831                             EC_KEY_get0_public_key(ecdh),
1832                             POINT_CONVERSION_UNCOMPRESSED,
1833                             encodedPoint, encodedlen, bn_ctx);
1834
1835                         if (encodedlen == 0)
1836                                 {
1837                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1838                                 goto err;
1839                                 }
1840
1841                         BN_CTX_free(bn_ctx);  bn_ctx=NULL;
1842
1843                         /* XXX: For now, we only support named (not
1844                          * generic) curves in ECDH ephemeral key exchanges.
1845                          * In this situation, we need four additional bytes
1846                          * to encode the entire ServerECDHParams
1847                          * structure.
1848                          */
1849                         n = 4 + encodedlen;
1850
1851                         /* We'll generate the serverKeyExchange message
1852                          * explicitly so we can set these to NULLs
1853                          */
1854                         r[0]=NULL;
1855                         r[1]=NULL;
1856                         r[2]=NULL;
1857                         r[3]=NULL;
1858                         }
1859                 else
1860 #endif /* !OPENSSL_NO_ECDH */
1861 #ifndef OPENSSL_NO_PSK
1862                         if (type & SSL_kPSK)
1863                                 {
1864                                 /* reserve size for record length and PSK identity hint*/
1865                                 n+=2+strlen(s->ctx->psk_identity_hint);
1866                                 }
1867                         else
1868 #endif /* !OPENSSL_NO_PSK */
1869 #ifndef OPENSSL_NO_SRP
1870                 if (type & SSL_kSRP)
1871                         {
1872                         if ((s->srp_ctx.N == NULL) ||
1873                                 (s->srp_ctx.g == NULL) ||
1874                                 (s->srp_ctx.s == NULL) ||
1875                                 (s->srp_ctx.B == NULL))
1876                                 {
1877                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_SRP_PARAM);
1878                                 goto err;
1879                                 }
1880                         r[0]=s->srp_ctx.N;
1881                         r[1]=s->srp_ctx.g;
1882                         r[2]=s->srp_ctx.s;
1883                         r[3]=s->srp_ctx.B;
1884                         }
1885                 else
1886 #endif
1887                         {
1888                         al=SSL_AD_HANDSHAKE_FAILURE;
1889                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1890                         goto f_err;
1891                         }
1892                 for (i=0; i < 4 && r[i] != NULL; i++)
1893                         {
1894                         nr[i]=BN_num_bytes(r[i]);
1895 #ifndef OPENSSL_NO_SRP
1896                         if ((i == 2) && (type & SSL_kSRP))
1897                                 n+=1+nr[i];
1898                         else
1899 #endif
1900                         n+=2+nr[i];
1901                         }
1902
1903                 if (!(s->s3->tmp.new_cipher->algorithm_auth & (SSL_aNULL|SSL_aSRP))
1904                         && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
1905                         {
1906                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher,&md))
1907                                 == NULL)
1908                                 {
1909                                 al=SSL_AD_DECODE_ERROR;
1910                                 goto f_err;
1911                                 }
1912                         kn=EVP_PKEY_size(pkey);
1913                         }
1914                 else
1915                         {
1916                         pkey=NULL;
1917                         kn=0;
1918                         }
1919
1920                 if (!BUF_MEM_grow_clean(buf,n+SSL_HM_HEADER_LENGTH(s)+kn))
1921                         {
1922                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1923                         goto err;
1924                         }
1925                 d = p = ssl_handshake_start(s);
1926
1927                 for (i=0; i < 4 && r[i] != NULL; i++)
1928                         {
1929 #ifndef OPENSSL_NO_SRP
1930                         if ((i == 2) && (type & SSL_kSRP))
1931                                 {
1932                                 *p = nr[i];
1933                                 p++;
1934                                 }
1935                         else
1936 #endif
1937                         s2n(nr[i],p);
1938                         BN_bn2bin(r[i],p);
1939                         p+=nr[i];
1940                         }
1941
1942 #ifndef OPENSSL_NO_ECDH
1943                 if (type & SSL_kECDHE)
1944                         {
1945                         /* XXX: For now, we only support named (not generic) curves.
1946                          * In this situation, the serverKeyExchange message has:
1947                          * [1 byte CurveType], [2 byte CurveName]
1948                          * [1 byte length of encoded point], followed by
1949                          * the actual encoded point itself
1950                          */
1951                         *p = NAMED_CURVE_TYPE;
1952                         p += 1;
1953                         *p = 0;
1954                         p += 1;
1955                         *p = curve_id;
1956                         p += 1;
1957                         *p = encodedlen;
1958                         p += 1;
1959                         memcpy((unsigned char*)p,
1960                             (unsigned char *)encodedPoint,
1961                             encodedlen);
1962                         OPENSSL_free(encodedPoint);
1963                         encodedPoint = NULL;
1964                         p += encodedlen;
1965                         }
1966 #endif
1967
1968 #ifndef OPENSSL_NO_PSK
1969                 if (type & SSL_kPSK)
1970                         {
1971                         /* copy PSK identity hint */
1972                         s2n(strlen(s->ctx->psk_identity_hint), p);
1973                         strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
1974                         p+=strlen(s->ctx->psk_identity_hint);
1975                         }
1976 #endif
1977
1978                 /* not anonymous */
1979                 if (pkey != NULL)
1980                         {
1981                         /* n is the length of the params, they start at &(d[4])
1982                          * and p points to the space at the end. */
1983 #ifndef OPENSSL_NO_RSA
1984                         if (pkey->type == EVP_PKEY_RSA && !SSL_USE_SIGALGS(s))
1985                                 {
1986                                 q=md_buf;
1987                                 j=0;
1988                                 for (num=2; num > 0; num--)
1989                                         {
1990                                         EVP_MD_CTX_set_flags(&md_ctx,
1991                                                 EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1992                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1993                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1994                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1995                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1996                                         EVP_DigestUpdate(&md_ctx,d,n);
1997                                         EVP_DigestFinal_ex(&md_ctx,q,
1998                                                 (unsigned int *)&i);
1999                                         q+=i;
2000                                         j+=i;
2001                                         }
2002                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
2003                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
2004                                         {
2005                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
2006                                         goto err;
2007                                         }
2008                                 s2n(u,p);
2009                                 n+=u+2;
2010                                 }
2011                         else
2012 #endif
2013                         if (md)
2014                                 {
2015                                 /* send signature algorithm */
2016                                 if (SSL_USE_SIGALGS(s))
2017                                         {
2018                                         if (!tls12_get_sigandhash(p, pkey, md))
2019                                                 {
2020                                                 /* Should never happen */
2021                                                 al=SSL_AD_INTERNAL_ERROR;
2022                                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2023                                                 goto f_err;
2024                                                 }
2025                                         p+=2;
2026                                         }
2027 #ifdef SSL_DEBUG
2028                                 fprintf(stderr, "Using hash %s\n",
2029                                                         EVP_MD_name(md));
2030 #endif
2031                                 EVP_SignInit_ex(&md_ctx, md, NULL);
2032                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
2033                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
2034                                 EVP_SignUpdate(&md_ctx,d,n);
2035                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
2036                                         (unsigned int *)&i,pkey))
2037                                         {
2038                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_EVP);
2039                                         goto err;
2040                                         }
2041                                 s2n(i,p);
2042                                 n+=i+2;
2043                                 if (SSL_USE_SIGALGS(s))
2044                                         n+= 2;
2045                                 }
2046                         else
2047                                 {
2048                                 /* Is this error check actually needed? */
2049                                 al=SSL_AD_HANDSHAKE_FAILURE;
2050                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
2051                                 goto f_err;
2052                                 }
2053                         }
2054
2055                 ssl_set_handshake_header(s, SSL3_MT_SERVER_KEY_EXCHANGE, n);
2056                 }
2057
2058         s->state = SSL3_ST_SW_KEY_EXCH_B;
2059         EVP_MD_CTX_cleanup(&md_ctx);
2060         return ssl_do_write(s);
2061 f_err:
2062         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2063 err:
2064 #ifndef OPENSSL_NO_ECDH
2065         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2066         BN_CTX_free(bn_ctx);
2067 #endif
2068         EVP_MD_CTX_cleanup(&md_ctx);
2069         return(-1);
2070         }
2071
2072 int ssl3_send_certificate_request(SSL *s)
2073         {
2074         unsigned char *p,*d;
2075         int i,j,nl,off,n;
2076         STACK_OF(X509_NAME) *sk=NULL;
2077         X509_NAME *name;
2078         BUF_MEM *buf;
2079
2080         if (s->state == SSL3_ST_SW_CERT_REQ_A)
2081                 {
2082                 buf=s->init_buf;
2083
2084                 d=p=ssl_handshake_start(s);
2085
2086                 /* get the list of acceptable cert types */
2087                 p++;
2088                 n=ssl3_get_req_cert_type(s,p);
2089                 d[0]=n;
2090                 p+=n;
2091                 n++;
2092
2093                 if (SSL_USE_SIGALGS(s))
2094                         {
2095                         const unsigned char *psigs;
2096                         unsigned char *etmp = p;
2097                         nl = tls12_get_psigalgs(s, &psigs);
2098                         /* Skip over length for now */
2099                         p += 2;
2100                         nl = tls12_copy_sigalgs(s, p, psigs, nl);
2101                         /* Now fill in length */
2102                         s2n(nl, etmp);
2103                         p += nl;
2104                         n += nl + 2;
2105                         }
2106
2107                 off=n;
2108                 p+=2;
2109                 n+=2;
2110
2111                 sk=SSL_get_client_CA_list(s);
2112                 nl=0;
2113                 if (sk != NULL)
2114                         {
2115                         for (i=0; i<sk_X509_NAME_num(sk); i++)
2116                                 {
2117                                 name=sk_X509_NAME_value(sk,i);
2118                                 j=i2d_X509_NAME(name,NULL);
2119                                 if (!BUF_MEM_grow_clean(buf,SSL_HM_HEADER_LENGTH(s)+n+j+2))
2120                                         {
2121                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
2122                                         goto err;
2123                                         }
2124                                 p = ssl_handshake_start(s) + n;
2125                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
2126                                         {
2127                                         s2n(j,p);
2128                                         i2d_X509_NAME(name,&p);
2129                                         n+=2+j;
2130                                         nl+=2+j;
2131                                         }
2132                                 else
2133                                         {
2134                                         d=p;
2135                                         i2d_X509_NAME(name,&p);
2136                                         j-=2; s2n(j,d); j+=2;
2137                                         n+=j;
2138                                         nl+=j;
2139                                         }
2140                                 }
2141                         }
2142                 /* else no CA names */
2143                 p = ssl_handshake_start(s) + off;
2144                 s2n(nl,p);
2145
2146                 ssl_set_handshake_header(s, SSL3_MT_CERTIFICATE_REQUEST, n);
2147
2148 #ifdef NETSCAPE_HANG_BUG
2149                 if (!SSL_IS_DTLS(s))
2150                         {
2151                         if (!BUF_MEM_grow_clean(buf, s->init_num + 4))
2152                                 {
2153                                 SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
2154                                 goto err;
2155                                 }
2156                         p=(unsigned char *)s->init_buf->data + s->init_num;
2157                         /* do the header */
2158                         *(p++)=SSL3_MT_SERVER_DONE;
2159                         *(p++)=0;
2160                         *(p++)=0;
2161                         *(p++)=0;
2162                         s->init_num += 4;
2163                         }
2164 #endif
2165
2166                 s->state = SSL3_ST_SW_CERT_REQ_B;
2167                 }
2168
2169         /* SSL3_ST_SW_CERT_REQ_B */
2170         return ssl_do_write(s);
2171 err:
2172         return(-1);
2173         }
2174
2175 int ssl3_get_client_key_exchange(SSL *s)
2176         {
2177         int i,al,ok;
2178         long n;
2179         unsigned long alg_k;
2180         unsigned char *p;
2181 #ifndef OPENSSL_NO_RSA
2182         RSA *rsa=NULL;
2183         EVP_PKEY *pkey=NULL;
2184 #endif
2185 #ifndef OPENSSL_NO_DH
2186         BIGNUM *pub=NULL;
2187         DH *dh_srvr, *dh_clnt = NULL;
2188 #endif
2189 #ifndef OPENSSL_NO_KRB5
2190         KSSL_ERR kssl_err;
2191 #endif /* OPENSSL_NO_KRB5 */
2192
2193 #ifndef OPENSSL_NO_ECDH
2194         EC_KEY *srvr_ecdh = NULL;
2195         EVP_PKEY *clnt_pub_pkey = NULL;
2196         EC_POINT *clnt_ecpoint = NULL;
2197         BN_CTX *bn_ctx = NULL;
2198 #endif
2199
2200         n=s->method->ssl_get_message(s,
2201                 SSL3_ST_SR_KEY_EXCH_A,
2202                 SSL3_ST_SR_KEY_EXCH_B,
2203                 SSL3_MT_CLIENT_KEY_EXCHANGE,
2204                 2048,
2205                 &ok);
2206
2207         if (!ok) return((int)n);
2208         p=(unsigned char *)s->init_msg;
2209
2210         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2211
2212 #ifndef OPENSSL_NO_RSA
2213         if (alg_k & SSL_kRSA)
2214                 {
2215                 unsigned char rand_premaster_secret[SSL_MAX_MASTER_KEY_LENGTH];
2216                 int decrypt_len;
2217                 unsigned char decrypt_good, version_good;
2218                 size_t j;
2219
2220                 /* FIX THIS UP EAY EAY EAY EAY */
2221                 if (s->s3->tmp.use_rsa_tmp)
2222                         {
2223                         if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
2224                                 rsa=s->cert->rsa_tmp;
2225                         /* Don't do a callback because rsa_tmp should
2226                          * be sent already */
2227                         if (rsa == NULL)
2228                                 {
2229                                 al=SSL_AD_HANDSHAKE_FAILURE;
2230                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
2231                                 goto f_err;
2232
2233                                 }
2234                         }
2235                 else
2236                         {
2237                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
2238                         if (    (pkey == NULL) ||
2239                                 (pkey->type != EVP_PKEY_RSA) ||
2240                                 (pkey->pkey.rsa == NULL))
2241                                 {
2242                                 al=SSL_AD_HANDSHAKE_FAILURE;
2243                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
2244                                 goto f_err;
2245                                 }
2246                         rsa=pkey->pkey.rsa;
2247                         }
2248
2249                 /* TLS and [incidentally] DTLS{0xFEFF} */
2250                 if (s->version > SSL3_VERSION && s->version != DTLS1_BAD_VER)
2251                         {
2252                         n2s(p,i);
2253                         if (n != i+2)
2254                                 {
2255                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
2256                                         {
2257                                         al = SSL_AD_DECODE_ERROR;
2258                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
2259                                         goto f_err;
2260                                         }
2261                                 else
2262                                         p-=2;
2263                                 }
2264                         else
2265                                 n=i;
2266                         }
2267
2268                 /*
2269                  * Reject overly short RSA ciphertext because we want to be sure
2270                  * that the buffer size makes it safe to iterate over the entire
2271                  * size of a premaster secret (SSL_MAX_MASTER_KEY_LENGTH). The
2272                  * actual expected size is larger due to RSA padding, but the
2273                  * bound is sufficient to be safe.
2274                  */
2275                 if (n < SSL_MAX_MASTER_KEY_LENGTH)
2276                         {
2277                         al = SSL_AD_DECRYPT_ERROR;
2278                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
2279                         goto f_err;
2280                         }
2281
2282                 /* We must not leak whether a decryption failure occurs because
2283                  * of Bleichenbacher's attack on PKCS #1 v1.5 RSA padding (see
2284                  * RFC 2246, section 7.4.7.1). The code follows that advice of
2285                  * the TLS RFC and generates a random premaster secret for the
2286                  * case that the decrypt fails. See
2287                  * https://tools.ietf.org/html/rfc5246#section-7.4.7.1 */
2288
2289                 /* should be RAND_bytes, but we cannot work around a failure. */
2290                 if (RAND_pseudo_bytes(rand_premaster_secret,
2291                                       sizeof(rand_premaster_secret)) <= 0)
2292                         goto err;
2293                 decrypt_len = RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
2294                 ERR_clear_error();
2295
2296                 /* decrypt_len should be SSL_MAX_MASTER_KEY_LENGTH.
2297                  * decrypt_good will be 0xff if so and zero otherwise. */
2298                 decrypt_good = constant_time_eq_int_8(decrypt_len, SSL_MAX_MASTER_KEY_LENGTH);
2299
2300                 /* If the version in the decrypted pre-master secret is correct
2301                  * then version_good will be 0xff, otherwise it'll be zero.
2302                  * The Klima-Pokorny-Rosa extension of Bleichenbacher's attack
2303                  * (http://eprint.iacr.org/2003/052/) exploits the version
2304                  * number check as a "bad version oracle". Thus version checks
2305                  * are done in constant time and are treated like any other
2306                  * decryption error. */
2307                 version_good = constant_time_eq_8(p[0], (unsigned)(s->client_version>>8));
2308                 version_good &= constant_time_eq_8(p[1], (unsigned)(s->client_version&0xff));
2309
2310                 /* The premaster secret must contain the same version number as
2311                  * the ClientHello to detect version rollback attacks
2312                  * (strangely, the protocol does not offer such protection for
2313                  * DH ciphersuites). However, buggy clients exist that send the
2314                  * negotiated protocol version instead if the server does not
2315                  * support the requested protocol version. If
2316                  * SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
2317                 if (s->options & SSL_OP_TLS_ROLLBACK_BUG)
2318                         {
2319                         unsigned char workaround_good;
2320                         workaround_good = constant_time_eq_8(p[0], (unsigned)(s->version>>8));
2321                         workaround_good &= constant_time_eq_8(p[1], (unsigned)(s->version&0xff));
2322                         version_good |= workaround_good;
2323                         }
2324
2325                 /* Both decryption and version must be good for decrypt_good
2326                  * to remain non-zero (0xff). */
2327                 decrypt_good &= version_good;
2328
2329                 /*
2330                  * Now copy rand_premaster_secret over from p using
2331                  * decrypt_good_mask. If decryption failed, then p does not
2332                  * contain valid plaintext, however, a check above guarantees
2333                  * it is still sufficiently large to read from.
2334                  */
2335                 for (j = 0; j < sizeof(rand_premaster_secret); j++)
2336                         {
2337                         p[j] = constant_time_select_8(decrypt_good, p[j],
2338                                                       rand_premaster_secret[j]);
2339                         }
2340
2341                 s->session->master_key_length=
2342                         s->method->ssl3_enc->generate_master_secret(s,
2343                                 s->session->master_key,
2344                                 p,sizeof(rand_premaster_secret));
2345                 OPENSSL_cleanse(p,sizeof(rand_premaster_secret));
2346                 }
2347         else
2348 #endif
2349 #ifndef OPENSSL_NO_DH
2350                 if (alg_k & (SSL_kDHE|SSL_kDHr|SSL_kDHd))
2351                 {
2352                 int idx = -1;
2353                 EVP_PKEY *skey = NULL;
2354                 if (n)
2355                         n2s(p,i);
2356                 else
2357                         i = 0;
2358                 if (n && n != i+2)
2359                         {
2360                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
2361                                 {
2362                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
2363                                 goto err;
2364                                 }
2365                         else
2366                                 {
2367                                 p-=2;
2368                                 i=(int)n;
2369                                 }
2370                         }
2371                 if (alg_k & SSL_kDHr)
2372                         idx = SSL_PKEY_DH_RSA;
2373                 else if (alg_k & SSL_kDHd)
2374                         idx = SSL_PKEY_DH_DSA;
2375                 if (idx >= 0)
2376                         {
2377                         skey = s->cert->pkeys[idx].privatekey;
2378                         if ((skey == NULL) ||
2379                                 (skey->type != EVP_PKEY_DH) ||
2380                                 (skey->pkey.dh == NULL))
2381                                 {
2382                                 al=SSL_AD_HANDSHAKE_FAILURE;
2383                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
2384                                 goto f_err;
2385                                 }
2386                         dh_srvr = skey->pkey.dh;
2387                         }
2388                 else if (s->s3->tmp.dh == NULL)
2389                         {
2390                         al=SSL_AD_HANDSHAKE_FAILURE;
2391                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
2392                         goto f_err;
2393                         }
2394                 else
2395                         dh_srvr=s->s3->tmp.dh;
2396
2397                 if (n == 0L)
2398                         {
2399                         /* Get pubkey from cert */
2400                         EVP_PKEY *clkey=X509_get_pubkey(s->session->peer);
2401                         if (clkey)
2402                                 {
2403                                 if (EVP_PKEY_cmp_parameters(clkey, skey) == 1)
2404                                         dh_clnt = EVP_PKEY_get1_DH(clkey);
2405                                 }
2406                         if (dh_clnt == NULL)
2407                                 {
2408                                 al=SSL_AD_HANDSHAKE_FAILURE;
2409                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
2410                                 goto f_err;
2411                                 }
2412                         EVP_PKEY_free(clkey);
2413                         pub = dh_clnt->pub_key;
2414                         }
2415                 else
2416                         pub=BN_bin2bn(p,i,NULL);
2417                 if (pub == NULL)
2418                         {
2419                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
2420                         goto err;
2421                         }
2422
2423                 i=DH_compute_key(p,pub,dh_srvr);
2424
2425                 if (i <= 0)
2426                         {
2427                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2428                         BN_clear_free(pub);
2429                         goto err;
2430                         }
2431
2432                 DH_free(s->s3->tmp.dh);
2433                 s->s3->tmp.dh=NULL;
2434                 if (dh_clnt)
2435                         DH_free(dh_clnt);
2436                 else
2437                         BN_clear_free(pub);
2438                 pub=NULL;
2439                 s->session->master_key_length=
2440                         s->method->ssl3_enc->generate_master_secret(s,
2441                                 s->session->master_key,p,i);
2442                 OPENSSL_cleanse(p,i);
2443                 if (dh_clnt)
2444                         return 2;
2445                 }
2446         else
2447 #endif
2448 #ifndef OPENSSL_NO_KRB5
2449         if (alg_k & SSL_kKRB5)
2450                 {
2451                 krb5_error_code         krb5rc;
2452                 krb5_data               enc_ticket;
2453                 krb5_data               authenticator;
2454                 krb5_data               enc_pms;
2455                 KSSL_CTX                *kssl_ctx = s->kssl_ctx;
2456                 EVP_CIPHER_CTX          ciph_ctx;
2457                 const EVP_CIPHER        *enc = NULL;
2458                 unsigned char           iv[EVP_MAX_IV_LENGTH];
2459                 unsigned char           pms[SSL_MAX_MASTER_KEY_LENGTH
2460                                                + EVP_MAX_BLOCK_LENGTH];
2461                 int                  padl, outl;
2462                 krb5_timestamp          authtime = 0;
2463                 krb5_ticket_times       ttimes;
2464
2465                 EVP_CIPHER_CTX_init(&ciph_ctx);
2466
2467                 if (!kssl_ctx)  kssl_ctx = kssl_ctx_new();
2468
2469                 n2s(p,i);
2470                 enc_ticket.length = i;
2471
2472                 if (n < (long)(enc_ticket.length + 6))
2473                         {
2474                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2475                                 SSL_R_DATA_LENGTH_TOO_LONG);
2476                         goto err;
2477                         }
2478
2479                 enc_ticket.data = (char *)p;
2480                 p+=enc_ticket.length;
2481
2482                 n2s(p,i);
2483                 authenticator.length = i;
2484
2485                 if (n < (long)(enc_ticket.length + authenticator.length + 6))
2486                         {
2487                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2488                                 SSL_R_DATA_LENGTH_TOO_LONG);
2489                         goto err;
2490                         }
2491
2492                 authenticator.data = (char *)p;
2493                 p+=authenticator.length;
2494
2495                 n2s(p,i);
2496                 enc_pms.length = i;
2497                 enc_pms.data = (char *)p;
2498                 p+=enc_pms.length;
2499
2500                 /* Note that the length is checked again below,
2501                 ** after decryption
2502                 */
2503                 if(enc_pms.length > sizeof pms)
2504                         {
2505                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2506                                SSL_R_DATA_LENGTH_TOO_LONG);
2507                         goto err;
2508                         }
2509
2510                 if (n != (long)(enc_ticket.length + authenticator.length +
2511                                                 enc_pms.length + 6))
2512                         {
2513                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2514                                 SSL_R_DATA_LENGTH_TOO_LONG);
2515                         goto err;
2516                         }
2517
2518                 if ((krb5rc = kssl_sget_tkt(kssl_ctx, &enc_ticket, &ttimes,
2519                                         &kssl_err)) != 0)
2520                         {
2521 #ifdef KSSL_DEBUG
2522                         fprintf(stderr,"kssl_sget_tkt rtn %d [%d]\n",
2523                                 krb5rc, kssl_err.reason);
2524                         if (kssl_err.text)
2525                                 fprintf(stderr,"kssl_err text= %s\n", kssl_err.text);
2526 #endif  /* KSSL_DEBUG */
2527                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2528                                 kssl_err.reason);
2529                         goto err;
2530                         }
2531
2532                 /*  Note: no authenticator is not considered an error,
2533                 **  but will return authtime == 0.
2534                 */
2535                 if ((krb5rc = kssl_check_authent(kssl_ctx, &authenticator,
2536                                         &authtime, &kssl_err)) != 0)
2537                         {
2538 #ifdef KSSL_DEBUG
2539                         fprintf(stderr,"kssl_check_authent rtn %d [%d]\n",
2540                                 krb5rc, kssl_err.reason);
2541                         if (kssl_err.text)
2542                                 fprintf(stderr,"kssl_err text= %s\n", kssl_err.text);
2543 #endif  /* KSSL_DEBUG */
2544                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2545                                 kssl_err.reason);
2546                         goto err;
2547                         }
2548
2549                 if ((krb5rc = kssl_validate_times(authtime, &ttimes)) != 0)
2550                         {
2551                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, krb5rc);
2552                         goto err;
2553                         }
2554
2555 #ifdef KSSL_DEBUG
2556                 kssl_ctx_show(kssl_ctx);
2557 #endif  /* KSSL_DEBUG */
2558
2559                 enc = kssl_map_enc(kssl_ctx->enctype);
2560                 if (enc == NULL)
2561                     goto err;
2562
2563                 memset(iv, 0, sizeof iv);       /* per RFC 1510 */
2564
2565                 if (!EVP_DecryptInit_ex(&ciph_ctx,enc,NULL,kssl_ctx->key,iv))
2566                         {
2567                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2568                                 SSL_R_DECRYPTION_FAILED);
2569                         goto err;
2570                         }
2571                 if (!EVP_DecryptUpdate(&ciph_ctx, pms,&outl,
2572                                         (unsigned char *)enc_pms.data, enc_pms.length))
2573                         {
2574                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2575                                 SSL_R_DECRYPTION_FAILED);
2576                         goto err;
2577                         }
2578                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2579                         {
2580                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2581                                 SSL_R_DATA_LENGTH_TOO_LONG);
2582                         goto err;
2583                         }
2584                 if (!EVP_DecryptFinal_ex(&ciph_ctx,&(pms[outl]),&padl))
2585                         {
2586                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2587                                 SSL_R_DECRYPTION_FAILED);
2588                         goto err;
2589                         }
2590                 outl += padl;
2591                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2592                         {
2593                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2594                                 SSL_R_DATA_LENGTH_TOO_LONG);
2595                         goto err;
2596                         }
2597                 if (!((pms[0] == (s->client_version>>8)) && (pms[1] == (s->client_version & 0xff))))
2598                     {
2599                     /* The premaster secret must contain the same version number as the
2600                      * ClientHello to detect version rollback attacks (strangely, the
2601                      * protocol does not offer such protection for DH ciphersuites).
2602                      * However, buggy clients exist that send random bytes instead of
2603                      * the protocol version.
2604                      * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients.
2605                      * (Perhaps we should have a separate BUG value for the Kerberos cipher)
2606                      */
2607                     if (!(s->options & SSL_OP_TLS_ROLLBACK_BUG))
2608                         {
2609                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2610                                SSL_AD_DECODE_ERROR);
2611                         goto err;
2612                         }
2613                     }
2614
2615                 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2616
2617                 s->session->master_key_length=
2618                         s->method->ssl3_enc->generate_master_secret(s,
2619                                 s->session->master_key, pms, outl);
2620
2621                 if (kssl_ctx->client_princ)
2622                         {
2623                         size_t len = strlen(kssl_ctx->client_princ);
2624                         if ( len < SSL_MAX_KRB5_PRINCIPAL_LENGTH )
2625                                 {
2626                                 s->session->krb5_client_princ_len = len;
2627                                 memcpy(s->session->krb5_client_princ,kssl_ctx->client_princ,len);
2628                                 }
2629                         }
2630
2631
2632                 /*- Was doing kssl_ctx_free() here,
2633                  *  but it caused problems for apache.
2634                  *  kssl_ctx = kssl_ctx_free(kssl_ctx);
2635                  *  if (s->kssl_ctx)  s->kssl_ctx = NULL;
2636                  */
2637                 }
2638         else
2639 #endif  /* OPENSSL_NO_KRB5 */
2640
2641 #ifndef OPENSSL_NO_ECDH
2642                 if (alg_k & (SSL_kECDHE|SSL_kECDHr|SSL_kECDHe))
2643                 {
2644                 int ret = 1;
2645                 int field_size = 0;
2646                 const EC_KEY   *tkey;
2647                 const EC_GROUP *group;
2648                 const BIGNUM *priv_key;
2649
2650                 /* initialize structures for server's ECDH key pair */
2651                 if ((srvr_ecdh = EC_KEY_new()) == NULL)
2652                         {
2653                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2654                             ERR_R_MALLOC_FAILURE);
2655                         goto err;
2656                         }
2657
2658                 /* Let's get server private key and group information */
2659                 if (alg_k & (SSL_kECDHr|SSL_kECDHe))
2660                         {
2661                         /* use the certificate */
2662                         tkey = s->cert->pkeys[SSL_PKEY_ECC].privatekey->pkey.ec;
2663                         }
2664                 else
2665                         {
2666                         /* use the ephermeral values we saved when
2667                          * generating the ServerKeyExchange msg.
2668                          */
2669                         tkey = s->s3->tmp.ecdh;
2670                         }
2671
2672                 group    = EC_KEY_get0_group(tkey);
2673                 priv_key = EC_KEY_get0_private_key(tkey);
2674
2675                 if (!EC_KEY_set_group(srvr_ecdh, group) ||
2676                     !EC_KEY_set_private_key(srvr_ecdh, priv_key))
2677                         {
2678                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2679                                ERR_R_EC_LIB);
2680                         goto err;
2681                         }
2682
2683                 /* Let's get client's public key */
2684                 if ((clnt_ecpoint = EC_POINT_new(group)) == NULL)
2685                         {
2686                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2687                             ERR_R_MALLOC_FAILURE);
2688                         goto err;
2689                         }
2690
2691                 if (n == 0L)
2692                         {
2693                         /* Client Publickey was in Client Certificate */
2694
2695                          if (alg_k & SSL_kECDHE)
2696                                  {
2697                                  al=SSL_AD_HANDSHAKE_FAILURE;
2698                                  SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
2699                                  goto f_err;
2700                                  }
2701                         if (((clnt_pub_pkey=X509_get_pubkey(s->session->peer))
2702                             == NULL) ||
2703                             (clnt_pub_pkey->type != EVP_PKEY_EC))
2704                                 {
2705                                 /* XXX: For now, we do not support client
2706                                  * authentication using ECDH certificates
2707                                  * so this branch (n == 0L) of the code is
2708                                  * never executed. When that support is
2709                                  * added, we ought to ensure the key
2710                                  * received in the certificate is
2711                                  * authorized for key agreement.
2712                                  * ECDH_compute_key implicitly checks that
2713                                  * the two ECDH shares are for the same
2714                                  * group.
2715                                  */
2716                                 al=SSL_AD_HANDSHAKE_FAILURE;
2717                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2718                                     SSL_R_UNABLE_TO_DECODE_ECDH_CERTS);
2719                                 goto f_err;
2720                                 }
2721
2722                         if (EC_POINT_copy(clnt_ecpoint,
2723                             EC_KEY_get0_public_key(clnt_pub_pkey->pkey.ec)) == 0)
2724                                 {
2725                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2726                                         ERR_R_EC_LIB);
2727                                 goto err;
2728                                 }
2729                         ret = 2; /* Skip certificate verify processing */
2730                         }
2731                 else
2732                         {
2733                         /* Get client's public key from encoded point
2734                          * in the ClientKeyExchange message.
2735                          */
2736                         if ((bn_ctx = BN_CTX_new()) == NULL)
2737                                 {
2738                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2739                                     ERR_R_MALLOC_FAILURE);
2740                                 goto err;
2741                                 }
2742
2743                         /* Get encoded point length */
2744                         i = *p;
2745                         p += 1;
2746                         if (n != 1 + i)
2747                                 {
2748                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2749                                     ERR_R_EC_LIB);
2750                                 goto err;
2751                                 }
2752                         if (EC_POINT_oct2point(group,
2753                             clnt_ecpoint, p, i, bn_ctx) == 0)
2754                                 {
2755                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2756                                     ERR_R_EC_LIB);
2757                                 goto err;
2758                                 }
2759                         /* p is pointing to somewhere in the buffer
2760                          * currently, so set it to the start
2761                          */
2762                         p=(unsigned char *)s->init_buf->data;
2763                         }
2764
2765                 /* Compute the shared pre-master secret */
2766                 field_size = EC_GROUP_get_degree(group);
2767                 if (field_size <= 0)
2768                         {
2769                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2770                                ERR_R_ECDH_LIB);
2771                         goto err;
2772                         }
2773                 i = ECDH_compute_key(p, (field_size+7)/8, clnt_ecpoint, srvr_ecdh, NULL);
2774                 if (i <= 0)
2775                         {
2776                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2777                             ERR_R_ECDH_LIB);
2778                         goto err;
2779                         }
2780
2781                 EVP_PKEY_free(clnt_pub_pkey);
2782                 EC_POINT_free(clnt_ecpoint);
2783                 EC_KEY_free(srvr_ecdh);
2784                 BN_CTX_free(bn_ctx);
2785                 EC_KEY_free(s->s3->tmp.ecdh);
2786                 s->s3->tmp.ecdh = NULL;
2787
2788                 /* Compute the master secret */
2789                 s->session->master_key_length = s->method->ssl3_enc-> \
2790                     generate_master_secret(s, s->session->master_key, p, i);
2791
2792                 OPENSSL_cleanse(p, i);
2793                 return (ret);
2794                 }
2795         else
2796 #endif
2797 #ifndef OPENSSL_NO_PSK
2798                 if (alg_k & SSL_kPSK)
2799                         {
2800                         unsigned char *t = NULL;
2801                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
2802                         unsigned int pre_ms_len = 0, psk_len = 0;
2803                         int psk_err = 1;
2804                         char tmp_id[PSK_MAX_IDENTITY_LEN+1];
2805
2806                         al=SSL_AD_HANDSHAKE_FAILURE;
2807
2808                         n2s(p,i);
2809                         if (n != i+2)
2810                                 {
2811                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2812                                         SSL_R_LENGTH_MISMATCH);
2813                                 goto psk_err;
2814                                 }
2815                         if (i > PSK_MAX_IDENTITY_LEN)
2816                                 {
2817                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2818                                         SSL_R_DATA_LENGTH_TOO_LONG);
2819                                 goto psk_err;
2820                                 }
2821                         if (s->psk_server_callback == NULL)
2822                                 {
2823                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2824                                        SSL_R_PSK_NO_SERVER_CB);
2825                                 goto psk_err;
2826                                 }
2827
2828                         /* Create guaranteed NULL-terminated identity
2829                          * string for the callback */
2830                         memcpy(tmp_id, p, i);
2831                         memset(tmp_id+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
2832                         psk_len = s->psk_server_callback(s, tmp_id,
2833                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
2834                         OPENSSL_cleanse(tmp_id, PSK_MAX_IDENTITY_LEN+1);
2835
2836                         if (psk_len > PSK_MAX_PSK_LEN)
2837                                 {
2838                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2839                                         ERR_R_INTERNAL_ERROR);
2840                                 goto psk_err;
2841                                 }
2842                         else if (psk_len == 0)
2843                                 {
2844                                 /* PSK related to the given identity not found */
2845                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2846                                        SSL_R_PSK_IDENTITY_NOT_FOUND);
2847                                 al=SSL_AD_UNKNOWN_PSK_IDENTITY;
2848                                 goto psk_err;
2849                                 }
2850
2851                         /* create PSK pre_master_secret */
2852                         pre_ms_len=2+psk_len+2+psk_len;
2853                         t = psk_or_pre_ms;
2854                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
2855                         s2n(psk_len, t);
2856                         memset(t, 0, psk_len);
2857                         t+=psk_len;
2858                         s2n(psk_len, t);
2859
2860                         if (s->session->psk_identity != NULL)
2861                                 OPENSSL_free(s->session->psk_identity);
2862                         s->session->psk_identity = BUF_strdup((char *)p);
2863                         if (s->session->psk_identity == NULL)
2864                                 {
2865                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2866                                         ERR_R_MALLOC_FAILURE);
2867                                 goto psk_err;
2868                                 }
2869
2870                         if (s->session->psk_identity_hint != NULL)
2871                                 OPENSSL_free(s->session->psk_identity_hint);
2872                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
2873                         if (s->ctx->psk_identity_hint != NULL &&
2874                                 s->session->psk_identity_hint == NULL)
2875                                 {
2876                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2877                                         ERR_R_MALLOC_FAILURE);
2878                                 goto psk_err;
2879                                 }
2880
2881                         s->session->master_key_length=
2882                                 s->method->ssl3_enc->generate_master_secret(s,
2883                                         s->session->master_key, psk_or_pre_ms, pre_ms_len);
2884                         psk_err = 0;
2885                 psk_err:
2886                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
2887                         if (psk_err != 0)
2888                                 goto f_err;
2889                         }
2890                 else
2891 #endif
2892 #ifndef OPENSSL_NO_SRP
2893                 if (alg_k & SSL_kSRP)
2894                         {
2895                         int param_len;
2896
2897                         n2s(p,i);
2898                         param_len=i+2;
2899                         if (param_len > n)
2900                                 {
2901                                 al=SSL_AD_DECODE_ERROR;
2902                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_SRP_A_LENGTH);
2903                                 goto f_err;
2904                                 }
2905                         if (!(s->srp_ctx.A=BN_bin2bn(p,i,NULL)))
2906                                 {
2907                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_BN_LIB);
2908                                 goto err;
2909                                 }
2910                         if (BN_ucmp(s->srp_ctx.A, s->srp_ctx.N) >= 0
2911                                 || BN_is_zero(s->srp_ctx.A))
2912                                 {
2913                                 al=SSL_AD_ILLEGAL_PARAMETER;
2914                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_SRP_PARAMETERS);
2915                                 goto f_err;
2916                                 }
2917                         if (s->session->srp_username != NULL)
2918                                 OPENSSL_free(s->session->srp_username);
2919                         s->session->srp_username = BUF_strdup(s->srp_ctx.login);
2920                         if (s->session->srp_username == NULL)
2921                                 {
2922                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2923                                         ERR_R_MALLOC_FAILURE);
2924                                 goto err;
2925                                 }
2926
2927                         if ((s->session->master_key_length = SRP_generate_server_master_secret(s,s->session->master_key))<0)
2928                                 {
2929                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2930                                 goto err;
2931                                 }
2932
2933                         p+=i;
2934                         }
2935                 else
2936 #endif  /* OPENSSL_NO_SRP */
2937                 if (alg_k & SSL_kGOST)
2938                         {
2939                         int ret = 0;
2940                         EVP_PKEY_CTX *pkey_ctx;
2941                         EVP_PKEY *client_pub_pkey = NULL, *pk = NULL;
2942                         unsigned char premaster_secret[32], *start;
2943                         size_t outlen=32, inlen;
2944                         unsigned long alg_a;
2945                         int Ttag, Tclass;
2946                         long Tlen;
2947
2948                         /* Get our certificate private key*/
2949                         alg_a = s->s3->tmp.new_cipher->algorithm_auth;
2950                         if (alg_a & SSL_aGOST94)
2951                                 pk = s->cert->pkeys[SSL_PKEY_GOST94].privatekey;
2952                         else if (alg_a & SSL_aGOST01)
2953                                 pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey;
2954
2955                         pkey_ctx = EVP_PKEY_CTX_new(pk,NULL);
2956                         EVP_PKEY_decrypt_init(pkey_ctx);
2957                         /* If client certificate is present and is of the same type, maybe
2958                          * use it for key exchange.  Don't mind errors from
2959                          * EVP_PKEY_derive_set_peer, because it is completely valid to use
2960                          * a client certificate for authorization only. */
2961                         client_pub_pkey = X509_get_pubkey(s->session->peer);
2962                         if (client_pub_pkey)
2963                                 {
2964                                 if (EVP_PKEY_derive_set_peer(pkey_ctx, client_pub_pkey) <= 0)
2965                                         ERR_clear_error();
2966                                 }
2967                         /* Decrypt session key */
2968                         if (ASN1_get_object((const unsigned char **)&p, &Tlen, &Ttag, &Tclass, n) != V_ASN1_CONSTRUCTED ||
2969                                 Ttag != V_ASN1_SEQUENCE ||
2970                                 Tclass != V_ASN1_UNIVERSAL)
2971                                 {
2972                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2973                                 goto gerr;
2974                                 }
2975                         start = p;
2976                         inlen = Tlen;
2977                         if (EVP_PKEY_decrypt(pkey_ctx,premaster_secret,&outlen,start,inlen) <=0)
2978
2979                                 {
2980                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2981                                 goto gerr;
2982                                 }
2983                         /* Generate master secret */
2984                         s->session->master_key_length=
2985                                 s->method->ssl3_enc->generate_master_secret(s,
2986                                         s->session->master_key,premaster_secret,32);
2987                         /* Check if pubkey from client certificate was used */
2988                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
2989                                 ret = 2;
2990                         else
2991                                 ret = 1;
2992                 gerr:
2993                         EVP_PKEY_free(client_pub_pkey);
2994                         EVP_PKEY_CTX_free(pkey_ctx);
2995                         if (ret)
2996                                 return ret;
2997                         else
2998                                 goto err;
2999                         }
3000                 else
3001                 {
3002                 al=SSL_AD_HANDSHAKE_FAILURE;
3003                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
3004                                 SSL_R_UNKNOWN_CIPHER_TYPE);
3005                 goto f_err;
3006                 }
3007
3008         return(1);
3009 f_err:
3010         ssl3_send_alert(s,SSL3_AL_FATAL,al);
3011 #if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA) || !defined(OPENSSL_NO_ECDH) || defined(OPENSSL_NO_SRP)
3012 err:
3013 #endif
3014 #ifndef OPENSSL_NO_ECDH
3015         EVP_PKEY_free(clnt_pub_pkey);
3016         EC_POINT_free(clnt_ecpoint);
3017         if (srvr_ecdh != NULL)
3018                 EC_KEY_free(srvr_ecdh);
3019         BN_CTX_free(bn_ctx);
3020 #endif
3021         return(-1);
3022         }
3023
3024 int ssl3_get_cert_verify(SSL *s)
3025         {
3026         EVP_PKEY *pkey=NULL;
3027         unsigned char *p;
3028         int al,ok,ret=0;
3029         long n;
3030         int type=0,i,j;
3031         X509 *peer;
3032         const EVP_MD *md = NULL;
3033         EVP_MD_CTX mctx;
3034         EVP_MD_CTX_init(&mctx);
3035
3036         n=s->method->ssl_get_message(s,
3037                 SSL3_ST_SR_CERT_VRFY_A,
3038                 SSL3_ST_SR_CERT_VRFY_B,
3039                 -1,
3040                 SSL3_RT_MAX_PLAIN_LENGTH,
3041                 &ok);
3042
3043         if (!ok) return((int)n);
3044
3045         if (s->session->peer != NULL)
3046                 {
3047                 peer=s->session->peer;
3048                 pkey=X509_get_pubkey(peer);
3049                 type=X509_certificate_type(peer,pkey);
3050                 }
3051         else
3052                 {
3053                 peer=NULL;
3054                 pkey=NULL;
3055                 }
3056
3057         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
3058                 {
3059                 s->s3->tmp.reuse_message=1;
3060                 if (peer != NULL)
3061                         {
3062                         al=SSL_AD_UNEXPECTED_MESSAGE;
3063                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
3064                         goto f_err;
3065                         }
3066                 ret=1;
3067                 goto end;
3068                 }
3069
3070         if (peer == NULL)
3071                 {
3072                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
3073                 al=SSL_AD_UNEXPECTED_MESSAGE;
3074                 goto f_err;
3075                 }
3076
3077         if (!(type & EVP_PKT_SIGN))
3078                 {
3079                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
3080                 al=SSL_AD_ILLEGAL_PARAMETER;
3081                 goto f_err;
3082                 }
3083
3084         if (s->s3->change_cipher_spec)
3085                 {
3086                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
3087                 al=SSL_AD_UNEXPECTED_MESSAGE;
3088                 goto f_err;
3089                 }
3090
3091         /* we now have a signature that we need to verify */
3092         p=(unsigned char *)s->init_msg;
3093         /* Check for broken implementations of GOST ciphersuites */
3094         /* If key is GOST and n is exactly 64, it is bare
3095          * signature without length field */
3096         if (n==64 && (pkey->type==NID_id_GostR3410_94 ||
3097                 pkey->type == NID_id_GostR3410_2001) )
3098                 {
3099                 i=64;
3100                 }
3101         else
3102                 {
3103                 if (SSL_USE_SIGALGS(s))
3104                         {
3105                         int rv = tls12_check_peer_sigalg(&md, s, p, pkey);
3106                         if (rv == -1)
3107                                 {
3108                                 al = SSL_AD_INTERNAL_ERROR;
3109                                 goto f_err;
3110                                 }
3111                         else if (rv == 0)
3112                                 {
3113                                 al = SSL_AD_DECODE_ERROR;
3114                                 goto f_err;
3115                                 }
3116 #ifdef SSL_DEBUG
3117 fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
3118 #endif
3119                         p += 2;
3120                         n -= 2;
3121                         }
3122                 n2s(p,i);
3123                 n-=2;
3124                 if (i > n)
3125                         {
3126                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
3127                         al=SSL_AD_DECODE_ERROR;
3128                         goto f_err;
3129                         }
3130         }
3131         j=EVP_PKEY_size(pkey);
3132         if ((i > j) || (n > j) || (n <= 0))
3133                 {
3134                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
3135                 al=SSL_AD_DECODE_ERROR;
3136                 goto f_err;
3137                 }
3138
3139         if (SSL_USE_SIGALGS(s))
3140                 {
3141                 long hdatalen = 0;
3142                 void *hdata;
3143                 hdatalen = BIO_get_mem_data(s->s3->handshake_buffer, &hdata);
3144                 if (hdatalen <= 0)
3145                         {
3146                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, ERR_R_INTERNAL_ERROR);
3147                         al=SSL_AD_INTERNAL_ERROR;
3148                         goto f_err;
3149                         }
3150 #ifdef SSL_DEBUG
3151                 fprintf(stderr, "Using TLS 1.2 with client verify alg %s\n",
3152                                                         EVP_MD_name(md));
3153 #endif
3154                 if (!EVP_VerifyInit_ex(&mctx, md, NULL)
3155                         || !EVP_VerifyUpdate(&mctx, hdata, hdatalen))
3156                         {
3157                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, ERR_R_EVP_LIB);
3158                         al=SSL_AD_INTERNAL_ERROR;
3159                         goto f_err;
3160                         }
3161
3162                 if (EVP_VerifyFinal(&mctx, p , i, pkey) <= 0)
3163                         {
3164                         al=SSL_AD_DECRYPT_ERROR;
3165                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_SIGNATURE);
3166                         goto f_err;
3167                         }
3168                 }
3169         else
3170 #ifndef OPENSSL_NO_RSA
3171         if (pkey->type == EVP_PKEY_RSA)
3172                 {
3173                 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
3174                         MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i,
3175                                                         pkey->pkey.rsa);
3176                 if (i < 0)
3177                         {
3178                         al=SSL_AD_DECRYPT_ERROR;
3179                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
3180                         goto f_err;
3181                         }
3182                 if (i == 0)
3183                         {
3184                         al=SSL_AD_DECRYPT_ERROR;
3185                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
3186                         goto f_err;
3187                         }
3188                 }
3189         else
3190 #endif
3191 #ifndef OPENSSL_NO_DSA
3192                 if (pkey->type == EVP_PKEY_DSA)
3193                 {
3194                 j=DSA_verify(pkey->save_type,
3195                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
3196                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
3197                 if (j <= 0)
3198                         {
3199                         /* bad signature */
3200                         al=SSL_AD_DECRYPT_ERROR;
3201                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
3202                         goto f_err;
3203                         }
3204                 }
3205         else
3206 #endif
3207 #ifndef OPENSSL_NO_ECDSA
3208                 if (pkey->type == EVP_PKEY_EC)
3209                 {
3210                 j=ECDSA_verify(pkey->save_type,
3211                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
3212                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.ec);
3213                 if (j <= 0)
3214                         {
3215                         /* bad signature */
3216                         al=SSL_AD_DECRYPT_ERROR;
3217                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
3218                             SSL_R_BAD_ECDSA_SIGNATURE);
3219                         goto f_err;
3220                         }
3221                 }
3222         else
3223 #endif
3224         if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001)
3225                 {   unsigned char signature[64];
3226                         int idx;
3227                         EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new(pkey,NULL);
3228                         EVP_PKEY_verify_init(pctx);
3229                         if (i!=64) {
3230                                 fprintf(stderr,"GOST signature length is %d",i);
3231                         }
3232                         for (idx=0;idx<64;idx++) {
3233                                 signature[63-idx]=p[idx];
3234                         }
3235                         j=EVP_PKEY_verify(pctx,signature,64,s->s3->tmp.cert_verify_md,32);
3236                         EVP_PKEY_CTX_free(pctx);
3237                         if (j<=0)
3238                                 {
3239                                 al=SSL_AD_DECRYPT_ERROR;
3240                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
3241                                         SSL_R_BAD_ECDSA_SIGNATURE);
3242                                 goto f_err;
3243                                 }
3244                 }
3245         else
3246                 {
3247                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
3248                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
3249                 goto f_err;
3250                 }
3251
3252
3253         ret=1;
3254         if (0)
3255                 {
3256 f_err:
3257                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
3258                 }
3259 end:
3260         if (s->s3->handshake_buffer)
3261                 {
3262                 BIO_free(s->s3->handshake_buffer);
3263                 s->s3->handshake_buffer = NULL;
3264                 s->s3->flags &= ~TLS1_FLAGS_KEEP_HANDSHAKE;
3265                 }
3266         EVP_MD_CTX_cleanup(&mctx);
3267         EVP_PKEY_free(pkey);
3268         return(ret);
3269         }
3270
3271 int ssl3_get_client_certificate(SSL *s)
3272         {
3273         int i,ok,al,ret= -1;
3274         X509 *x=NULL;
3275         unsigned long l,nc,llen,n;
3276         const unsigned char *p,*q;
3277         unsigned char *d;
3278         STACK_OF(X509) *sk=NULL;
3279
3280         n=s->method->ssl_get_message(s,
3281                 SSL3_ST_SR_CERT_A,
3282                 SSL3_ST_SR_CERT_B,
3283                 -1,
3284                 s->max_cert_list,
3285                 &ok);
3286
3287         if (!ok) return((int)n);
3288
3289         if      (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
3290                 {
3291                 if (    (s->verify_mode & SSL_VERIFY_PEER) &&
3292                         (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
3293                         {
3294                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
3295                         al=SSL_AD_HANDSHAKE_FAILURE;
3296                         goto f_err;
3297                         }
3298                 /* If tls asked for a client cert, the client must return a 0 list */
3299                 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
3300                         {
3301                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
3302                         al=SSL_AD_UNEXPECTED_MESSAGE;
3303                         goto f_err;
3304                         }
3305                 s->s3->tmp.reuse_message=1;
3306                 return(1);
3307                 }
3308
3309         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
3310                 {
3311                 al=SSL_AD_UNEXPECTED_MESSAGE;
3312                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
3313                 goto f_err;
3314                 }
3315         p=d=(unsigned char *)s->init_msg;
3316
3317         if ((sk=sk_X509_new_null()) == NULL)
3318                 {
3319                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
3320                 goto err;
3321                 }
3322
3323         n2l3(p,llen);
3324         if (llen+3 != n)
3325                 {
3326                 al=SSL_AD_DECODE_ERROR;
3327                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
3328                 goto f_err;
3329                 }
3330         for (nc=0; nc<llen; )
3331                 {
3332                 n2l3(p,l);
3333                 if ((l+nc+3) > llen)
3334                         {
3335                         al=SSL_AD_DECODE_ERROR;
3336                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
3337                         goto f_err;
3338                         }
3339
3340                 q=p;
3341                 x=d2i_X509(NULL,&p,l);
3342                 if (x == NULL)
3343                         {
3344                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
3345                         goto err;
3346                         }
3347                 if (p != (q+l))
3348                         {
3349                         al=SSL_AD_DECODE_ERROR;
3350                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
3351                         goto f_err;
3352                         }
3353                 if (!sk_X509_push(sk,x))
3354                         {
3355                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
3356                         goto err;
3357                         }
3358                 x=NULL;
3359                 nc+=l+3;
3360                 }
3361
3362         if (sk_X509_num(sk) <= 0)
3363                 {
3364                 /* TLS does not mind 0 certs returned */
3365                 if (s->version == SSL3_VERSION)
3366                         {
3367                         al=SSL_AD_HANDSHAKE_FAILURE;
3368                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
3369                         goto f_err;
3370                         }
3371                 /* Fail for TLS only if we required a certificate */
3372                 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
3373                          (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
3374                         {
3375                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
3376                         al=SSL_AD_HANDSHAKE_FAILURE;
3377                         goto f_err;
3378                         }
3379                 /* No client certificate so digest cached records */
3380                 if (s->s3->handshake_buffer && !ssl3_digest_cached_records(s))
3381                         {
3382                         al=SSL_AD_INTERNAL_ERROR;
3383                         goto f_err;
3384                         }
3385                 }
3386         else
3387                 {
3388                 EVP_PKEY *pkey;
3389                 i=ssl_verify_cert_chain(s,sk);
3390                 if (i <= 0)
3391                         {
3392                         al=ssl_verify_alarm_type(s->verify_result);
3393                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
3394                         goto f_err;
3395                         }
3396                 if (i > 1)
3397                         {
3398                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, i);
3399                         al = SSL_AD_HANDSHAKE_FAILURE;
3400                         goto f_err;
3401                         }
3402                 pkey = X509_get_pubkey(sk_X509_value(sk, 0));
3403                 if (pkey == NULL)
3404                         {
3405                         al=SSL3_AD_HANDSHAKE_FAILURE;
3406                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,
3407                                                 SSL_R_UNKNOWN_CERTIFICATE_TYPE);
3408                         goto f_err;
3409                         }
3410                 EVP_PKEY_free(pkey);
3411                 }
3412
3413         if (s->session->peer != NULL) /* This should not be needed */
3414                 X509_free(s->session->peer);
3415         s->session->peer=sk_X509_shift(sk);
3416         s->session->verify_result = s->verify_result;
3417
3418         /* With the current implementation, sess_cert will always be NULL
3419          * when we arrive here. */
3420         if (s->session->sess_cert == NULL)
3421                 {
3422                 s->session->sess_cert = ssl_sess_cert_new();
3423                 if (s->session->sess_cert == NULL)
3424                         {
3425                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
3426                         goto err;
3427                         }
3428                 }
3429         if (s->session->sess_cert->cert_chain != NULL)
3430                 sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free);
3431         s->session->sess_cert->cert_chain=sk;
3432         /* Inconsistency alert: cert_chain does *not* include the
3433          * peer's own certificate, while we do include it in s3_clnt.c */
3434
3435         sk=NULL;
3436
3437         ret=1;
3438         if (0)
3439                 {
3440 f_err:
3441                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
3442                 }
3443 err:
3444         if (x != NULL) X509_free(x);
3445         if (sk != NULL) sk_X509_pop_free(sk,X509_free);
3446         return(ret);
3447         }
3448
3449 int ssl3_send_server_certificate(SSL *s)
3450         {
3451         CERT_PKEY *cpk;
3452
3453         if (s->state == SSL3_ST_SW_CERT_A)
3454                 {
3455                 cpk=ssl_get_server_send_pkey(s);
3456                 if (cpk == NULL)
3457                         {
3458                         /* VRS: allow null cert if auth == KRB5 */
3459                         if ((s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5) ||
3460                             (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5))
3461                                 {
3462                                 SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
3463                                 return(0);
3464                                 }
3465                         }
3466
3467                 if (!ssl3_output_cert_chain(s,cpk))
3468                         {
3469                         SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
3470                         return(0);
3471                         }
3472                 s->state=SSL3_ST_SW_CERT_B;
3473                 }
3474
3475         /* SSL3_ST_SW_CERT_B */
3476         return ssl_do_write(s);
3477         }
3478
3479 #ifndef OPENSSL_NO_TLSEXT
3480 /* send a new session ticket (not necessarily for a new session) */
3481 int ssl3_send_newsession_ticket(SSL *s)
3482         {
3483         if (s->state == SSL3_ST_SW_SESSION_TICKET_A)
3484                 {
3485                 unsigned char *p, *senc, *macstart;
3486                 const unsigned char *const_p;
3487                 int len, slen_full, slen;
3488                 SSL_SESSION *sess;
3489                 unsigned int hlen;
3490                 EVP_CIPHER_CTX ctx;
3491                 HMAC_CTX hctx;
3492                 SSL_CTX *tctx = s->initial_ctx;
3493                 unsigned char iv[EVP_MAX_IV_LENGTH];
3494                 unsigned char key_name[16];
3495
3496                 /* get session encoding length */
3497                 slen_full = i2d_SSL_SESSION(s->session, NULL);
3498                 /* Some length values are 16 bits, so forget it if session is
3499                  * too long
3500                  */
3501                 if (slen_full > 0xFF00)
3502                         return -1;
3503                 senc = OPENSSL_malloc(slen_full);
3504                 if (!senc)
3505                         return -1;
3506                 p = senc;
3507                 i2d_SSL_SESSION(s->session, &p);
3508
3509                 /* create a fresh copy (not shared with other threads) to clean up */
3510                 const_p = senc;
3511                 sess = d2i_SSL_SESSION(NULL, &const_p, slen_full);
3512                 if (sess == NULL)
3513                         {
3514                         OPENSSL_free(senc);
3515                         return -1;
3516                         }
3517                 sess->session_id_length = 0; /* ID is irrelevant for the ticket */
3518
3519                 slen = i2d_SSL_SESSION(sess, NULL);
3520                 if (slen > slen_full) /* shouldn't ever happen */
3521                         {
3522                         OPENSSL_free(senc);
3523                         return -1;
3524                         }
3525                 p = senc;
3526                 i2d_SSL_SESSION(sess, &p);
3527                 SSL_SESSION_free(sess);
3528
3529                 /*-
3530                  * Grow buffer if need be: the length calculation is as
3531                  * follows handshake_header_length +
3532                  * 4 (ticket lifetime hint) + 2 (ticket length) +
3533                  * 16 (key name) + max_iv_len (iv length) +
3534                  * session_length + max_enc_block_size (max encrypted session
3535                  * length) + max_md_size (HMAC).
3536                  */
3537                 if (!BUF_MEM_grow(s->init_buf,
3538                         SSL_HM_HEADER_LENGTH(s) + 22 + EVP_MAX_IV_LENGTH +
3539                         EVP_MAX_BLOCK_LENGTH + EVP_MAX_MD_SIZE + slen))
3540                         return -1;
3541                 p = ssl_handshake_start(s);
3542                 EVP_CIPHER_CTX_init(&ctx);
3543                 HMAC_CTX_init(&hctx);
3544                 /* Initialize HMAC and cipher contexts. If callback present
3545                  * it does all the work otherwise use generated values
3546                  * from parent ctx.
3547                  */
3548                 if (tctx->tlsext_ticket_key_cb)
3549                         {
3550                         if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx,
3551                                                          &hctx, 1) < 0)
3552                                 {
3553                                 OPENSSL_free(senc);
3554                                 return -1;
3555                                 }
3556                         }
3557                 else
3558                         {
3559                         RAND_pseudo_bytes(iv, 16);
3560                         EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
3561                                         tctx->tlsext_tick_aes_key, iv);
3562                         HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
3563                                         tlsext_tick_md(), NULL);
3564                         memcpy(key_name, tctx->tlsext_tick_key_name, 16);
3565                         }
3566
3567                 /* Ticket lifetime hint (advisory only):
3568                  * We leave this unspecified for resumed session (for simplicity),
3569                  * and guess that tickets for new sessions will live as long
3570                  * as their sessions. */
3571                 l2n(s->hit ? 0 : s->session->timeout, p);
3572
3573                 /* Skip ticket length for now */
3574                 p += 2;
3575                 /* Output key name */
3576                 macstart = p;
3577                 memcpy(p, key_name, 16);
3578                 p += 16;
3579                 /* output IV */
3580                 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
3581                 p += EVP_CIPHER_CTX_iv_length(&ctx);
3582                 /* Encrypt session data */
3583                 EVP_EncryptUpdate(&ctx, p, &len, senc, slen);
3584                 p += len;
3585                 EVP_EncryptFinal(&ctx, p, &len);
3586                 p += len;
3587                 EVP_CIPHER_CTX_cleanup(&ctx);
3588
3589                 HMAC_Update(&hctx, macstart, p - macstart);
3590                 HMAC_Final(&hctx, p, &hlen);
3591                 HMAC_CTX_cleanup(&hctx);
3592
3593                 p += hlen;
3594                 /* Now write out lengths: p points to end of data written */
3595                 /* Total length */
3596                 len = p - ssl_handshake_start(s);
3597                 ssl_set_handshake_header(s, SSL3_MT_NEWSESSION_TICKET, len);
3598                 /* Skip ticket lifetime hint */
3599                 p = ssl_handshake_start(s) + 4;
3600                 s2n(len - 6, p);
3601                 s->state=SSL3_ST_SW_SESSION_TICKET_B;
3602                 OPENSSL_free(senc);
3603                 }
3604
3605         /* SSL3_ST_SW_SESSION_TICKET_B */
3606         return ssl_do_write(s);
3607         }
3608
3609 int ssl3_send_cert_status(SSL *s)
3610         {
3611         if (s->state == SSL3_ST_SW_CERT_STATUS_A)
3612                 {
3613                 unsigned char *p;
3614                 /*-
3615                  * Grow buffer if need be: the length calculation is as
3616                  * follows 1 (message type) + 3 (message length) +
3617                  * 1 (ocsp response type) + 3 (ocsp response length)
3618                  * + (ocsp response)
3619                  */
3620                 if (!BUF_MEM_grow(s->init_buf, 8 + s->tlsext_ocsp_resplen))
3621                         return -1;
3622
3623                 p=(unsigned char *)s->init_buf->data;
3624
3625                 /* do the header */
3626                 *(p++)=SSL3_MT_CERTIFICATE_STATUS;
3627                 /* message length */
3628                 l2n3(s->tlsext_ocsp_resplen + 4, p);
3629                 /* status type */
3630                 *(p++)= s->tlsext_status_type;
3631                 /* length of OCSP response */
3632                 l2n3(s->tlsext_ocsp_resplen, p);
3633                 /* actual response */
3634                 memcpy(p, s->tlsext_ocsp_resp, s->tlsext_ocsp_resplen);
3635                 /* number of bytes to write */
3636                 s->init_num = 8 + s->tlsext_ocsp_resplen;
3637                 s->state=SSL3_ST_SW_CERT_STATUS_B;
3638                 s->init_off = 0;
3639                 }
3640
3641         /* SSL3_ST_SW_CERT_STATUS_B */
3642         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3643         }
3644
3645 # ifndef OPENSSL_NO_NEXTPROTONEG
3646 /* ssl3_get_next_proto reads a Next Protocol Negotiation handshake message. It
3647  * sets the next_proto member in s if found */
3648 int ssl3_get_next_proto(SSL *s)
3649         {
3650         int ok;
3651         int proto_len, padding_len;
3652         long n;
3653         const unsigned char *p;
3654
3655         /* Clients cannot send a NextProtocol message if we didn't see the
3656          * extension in their ClientHello */
3657         if (!s->s3->next_proto_neg_seen)
3658                 {
3659                 SSLerr(SSL_F_SSL3_GET_NEXT_PROTO,SSL_R_GOT_NEXT_PROTO_WITHOUT_EXTENSION);
3660                 return -1;
3661                 }
3662
3663         /* See the payload format below */
3664         n=s->method->ssl_get_message(s,
3665                 SSL3_ST_SR_NEXT_PROTO_A,
3666                 SSL3_ST_SR_NEXT_PROTO_B,
3667                 SSL3_MT_NEXT_PROTO,
3668                 514,
3669                 &ok);
3670
3671         if (!ok)
3672                 return((int)n);
3673
3674         /* s->state doesn't reflect whether ChangeCipherSpec has been received
3675          * in this handshake, but s->s3->change_cipher_spec does (will be reset
3676          * by ssl3_get_finished). */
3677         if (!s->s3->change_cipher_spec)
3678                 {
3679                 SSLerr(SSL_F_SSL3_GET_NEXT_PROTO,SSL_R_GOT_NEXT_PROTO_BEFORE_A_CCS);
3680                 return -1;
3681                 }
3682
3683         if (n < 2)
3684                 return 0;  /* The body must be > 1 bytes long */
3685
3686         p=(unsigned char *)s->init_msg;
3687
3688         /*-
3689          * The payload looks like:
3690          *   uint8 proto_len;
3691          *   uint8 proto[proto_len];
3692          *   uint8 padding_len;
3693          *   uint8 padding[padding_len];
3694          */
3695         proto_len = p[0];
3696         if (proto_len + 2 > s->init_num)
3697                 return 0;
3698         padding_len = p[proto_len + 1];
3699         if (proto_len + padding_len + 2 != s->init_num)
3700                 return 0;
3701
3702         s->next_proto_negotiated = OPENSSL_malloc(proto_len);
3703         if (!s->next_proto_negotiated)
3704                 {
3705                 SSLerr(SSL_F_SSL3_GET_NEXT_PROTO,ERR_R_MALLOC_FAILURE);
3706                 return 0;
3707                 }
3708         memcpy(s->next_proto_negotiated, p + 1, proto_len);
3709         s->next_proto_negotiated_len = proto_len;
3710
3711         return 1;
3712         }
3713 # endif
3714
3715 #endif