ssl/s3_srvr.c

   1 /* ssl/s3_srvr.c -*- mode:C; c-file-style: "eay" -*- */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58 /* ====================================================================
  59  * Copyright (c) 1998-2007 The OpenSSL Project.  All rights reserved.
  60  *
  61  * Redistribution and use in source and binary forms, with or without
  62  * modification, are permitted provided that the following conditions
  63  * are met:
  64  *
  65  * 1. Redistributions of source code must retain the above copyright
  66  *    notice, this list of conditions and the following disclaimer.
  67  *
  68  * 2. Redistributions in binary form must reproduce the above copyright
  69  *    notice, this list of conditions and the following disclaimer in
  70  *    the documentation and/or other materials provided with the
  71  *    distribution.
  72  *
  73  * 3. All advertising materials mentioning features or use of this
  74  *    software must display the following acknowledgment:
  75  *    "This product includes software developed by the OpenSSL Project
  76  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  77  *
  78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  79  *    endorse or promote products derived from this software without
  80  *    prior written permission. For written permission, please contact
  81  *    openssl-core@openssl.org.
  82  *
  83  * 5. Products derived from this software may not be called "OpenSSL"
  84  *    nor may "OpenSSL" appear in their names without prior written
  85  *    permission of the OpenSSL Project.
  86  *
  87  * 6. Redistributions of any form whatsoever must retain the following
  88  *    acknowledgment:
  89  *    "This product includes software developed by the OpenSSL Project
  90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  91  *
  92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  95  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 103  * OF THE POSSIBILITY OF SUCH DAMAGE.
 104  * ====================================================================
 105  *
 106  * This product includes cryptographic software written by Eric Young
 107  * (eay@cryptsoft.com).  This product includes software written by Tim
 108  * Hudson (tjh@cryptsoft.com).
 109  *
 110  */
 111 /* ====================================================================
 112  * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
 113  *
 114  * Portions of the attached software ("Contribution") are developed by
 115  * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
 116  *
 117  * The Contribution is licensed pursuant to the OpenSSL open source
 118  * license provided above.
 119  *
 120  * ECC cipher suite support in OpenSSL originally written by
 121  * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories.
 122  *
 123  */
 124 /* ====================================================================
 125  * Copyright 2005 Nokia. All rights reserved.
 126  *
 127  * The portions of the attached software ("Contribution") is developed by
 128  * Nokia Corporation and is licensed pursuant to the OpenSSL open source
 129  * license.
 130  *
 131  * The Contribution, originally written by Mika Kousa and Pasi Eronen of
 132  * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
 133  * support (see RFC 4279) to OpenSSL.
 134  *
 135  * No patent licenses or other rights except those expressly stated in
 136  * the OpenSSL open source license shall be deemed granted or received
 137  * expressly, by implication, estoppel, or otherwise.
 138  *
 139  * No assurances are provided by Nokia that the Contribution does not
 140  * infringe the patent or other intellectual property rights of any third
 141  * party or that the license provides you with all the necessary rights
 142  * to make use of the Contribution.
 143  *
 144  * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
 145  * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
 146  * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
 147  * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
 148  * OTHERWISE.
 149  */
 150
 151 #define REUSE_CIPHER_BUG
 152 #define NETSCAPE_HANG_BUG
 153
 154 #include <stdio.h>
 155 #include "ssl_locl.h"
 156 #include "kssl_lcl.h"
 157 #include <openssl/buffer.h>
 158 #include <openssl/rand.h>
 159 #include <openssl/objects.h>
 160 #include <openssl/evp.h>
 161 #include <openssl/hmac.h>
 162 #include <openssl/x509.h>
 163 #ifndef OPENSSL_NO_DH
 164 #include <openssl/dh.h>
 165 #endif
 166 #include <openssl/bn.h>
 167 #ifndef OPENSSL_NO_KRB5
 168 #include <openssl/krb5_asn.h>
 169 #endif
 170 #include <openssl/md5.h>
 171
 172 static const SSL_METHOD *ssl3_get_server_method(int ver);
 173
 174 static const SSL_METHOD *ssl3_get_server_method(int ver)
 175         {
 176         if (ver == SSL3_VERSION)
 177                 return(SSLv3_server_method());
 178         else
 179                 return(NULL);
 180         }
 181
 182 #ifndef OPENSSL_NO_SRP
 183 static int ssl_check_srp_ext_ClientHello(SSL *s, int *al)
 184         {
 185         int ret = SSL_ERROR_NONE;
 186
 187         *al = SSL_AD_UNRECOGNIZED_NAME;
 188
 189         if ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP) &&
 190             (s->srp_ctx.TLS_ext_srp_username_callback != NULL))
 191                 {
 192                 if(s->srp_ctx.login == NULL)
 193                         {
 194                         /* RFC 5054 says SHOULD reject,
 195                            we do so if There is no srp login name */
 196                         ret = SSL3_AL_FATAL;
 197                         *al = SSL_AD_UNKNOWN_PSK_IDENTITY;
 198                         }
 199                 else
 200                         {
 201                         ret = SSL_srp_server_param_with_username(s,al);
 202                         }
 203                 }
 204         return ret;
 205         }
 206 #endif
 207
 208 IMPLEMENT_ssl3_meth_func(SSLv3_server_method,
 209                         ssl3_accept,
 210                         ssl_undefined_function,
 211                         ssl3_get_server_method)
 212
 213 int ssl3_accept(SSL *s)
 214         {
 215         BUF_MEM *buf;
 216         unsigned long alg_k,Time=(unsigned long)time(NULL);
 217         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 218         int ret= -1;
 219         int new_state,state,skip=0;
 220
 221         RAND_add(&Time,sizeof(Time),0);
 222         ERR_clear_error();
 223         clear_sys_error();
 224
 225         if (s->info_callback != NULL)
 226                 cb=s->info_callback;
 227         else if (s->ctx->info_callback != NULL)
 228                 cb=s->ctx->info_callback;
 229
 230         /* init things to blank */
 231         s->in_handshake++;
 232         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 233
 234         if (s->cert == NULL)
 235                 {
 236                 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
 237                 return(-1);
 238                 }
 239
 240 #ifndef OPENSSL_NO_HEARTBEATS
 241         /* If we're awaiting a HeartbeatResponse, pretend we
 242          * already got and don't await it anymore, because
 243          * Heartbeats don't make sense during handshakes anyway.
 244          */
 245         if (s->tlsext_hb_pending)
 246                 {
 247                 s->tlsext_hb_pending = 0;
 248                 s->tlsext_hb_seq++;
 249                 }
 250 #endif
 251
 252         for (;;)
 253                 {
 254                 state=s->state;
 255
 256                 switch (s->state)
 257                         {
 258                 case SSL_ST_RENEGOTIATE:
 259                         s->renegotiate=1;
 260                         /* s->state=SSL_ST_ACCEPT; */
 261
 262                 case SSL_ST_BEFORE:
 263                 case SSL_ST_ACCEPT:
 264                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 265                 case SSL_ST_OK|SSL_ST_ACCEPT:
 266
 267                         s->server=1;
 268                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 269
 270                         if ((s->version>>8) != 3)
 271                                 {
 272                                 SSLerr(SSL_F_SSL3_ACCEPT, ERR_R_INTERNAL_ERROR);
 273                                 return -1;
 274                                 }
 275                         s->type=SSL_ST_ACCEPT;
 276
 277                         if (s->init_buf == NULL)
 278                                 {
 279                                 if ((buf=BUF_MEM_new()) == NULL)
 280                                         {
 281                                         ret= -1;
 282                                         goto end;
 283                                         }
 284                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 285                                         {
 286                                         ret= -1;
 287                                         goto end;
 288                                         }
 289                                 s->init_buf=buf;
 290                                 }
 291
 292                         if (!ssl3_setup_buffers(s))
 293                                 {
 294                                 ret= -1;
 295                                 goto end;
 296                                 }
 297
 298                         s->init_num=0;
 299                         s->s3->flags &= ~SSL3_FLAGS_SGC_RESTART_DONE;
 300                         s->s3->flags &= ~TLS1_FLAGS_SKIP_CERT_VERIFY;
 301
 302                         if (s->state != SSL_ST_RENEGOTIATE)
 303                                 {
 304                                 /* Ok, we now need to push on a buffering BIO so that
 305                                  * the output is sent in a way that TCP likes :-)
 306                                  */
 307                                 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
 308
 309                                 ssl3_init_finished_mac(s);
 310                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
 311                                 s->ctx->stats.sess_accept++;
 312                                 }
 313                         else if (!s->s3->send_connection_binding &&
 314                                 !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
 315                                 {
 316                                 /* Server attempting to renegotiate with
 317                                  * client that doesn't support secure
 318                                  * renegotiation.
 319                                  */
 320                                 SSLerr(SSL_F_SSL3_ACCEPT, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
 321                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
 322                                 ret = -1;
 323                                 goto end;
 324                                 }
 325                         else
 326                                 {
 327                                 /* s->state == SSL_ST_RENEGOTIATE,
 328                                  * we will just send a HelloRequest */
 329                                 s->ctx->stats.sess_accept_renegotiate++;
 330                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
 331                                 }
 332                         break;
 333
 334                 case SSL3_ST_SW_HELLO_REQ_A:
 335                 case SSL3_ST_SW_HELLO_REQ_B:
 336
 337                         s->shutdown=0;
 338                         ret=ssl3_send_hello_request(s);
 339                         if (ret <= 0) goto end;
 340                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
 341                         s->state=SSL3_ST_SW_FLUSH;
 342                         s->init_num=0;
 343
 344                         ssl3_init_finished_mac(s);
 345                         break;
 346
 347                 case SSL3_ST_SW_HELLO_REQ_C:
 348                         s->state=SSL_ST_OK;
 349                         break;
 350
 351                 case SSL3_ST_SR_CLNT_HELLO_A:
 352                 case SSL3_ST_SR_CLNT_HELLO_B:
 353                 case SSL3_ST_SR_CLNT_HELLO_C:
 354
 355                         s->shutdown=0;
 356                         if (s->rwstate != SSL_X509_LOOKUP)
 357                         {
 358                                 ret=ssl3_get_client_hello(s);
 359                                 if (ret <= 0) goto end;
 360                         }
 361 #ifndef OPENSSL_NO_SRP
 362                         {
 363                         int al;
 364                         if ((ret = ssl_check_srp_ext_ClientHello(s,&al))  < 0)
 365                                         {
 366                                         /* callback indicates firther work to be done */
 367                                         s->rwstate=SSL_X509_LOOKUP;
 368                                         goto end;
 369                                         }
 370                         if (ret != SSL_ERROR_NONE)
 371                                 {
 372                                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
 373                                 /* This is not really an error but the only means to
 374                                    for a client to detect whether srp is supported. */
 375                                    if (al != TLS1_AD_UNKNOWN_PSK_IDENTITY)
 376                                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_CLIENTHELLO_TLSEXT);
 377                                 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
 378                                 ret= -1;
 379                                 goto end;
 380                                 }
 381                         }
 382 #endif
 383
 384                         s->renegotiate = 2;
 385                         s->state=SSL3_ST_SW_SRVR_HELLO_A;
 386                         s->init_num=0;
 387                         break;
 388
 389                 case SSL3_ST_SW_SRVR_HELLO_A:
 390                 case SSL3_ST_SW_SRVR_HELLO_B:
 391                         ret=ssl3_send_server_hello(s);
 392                         if (ret <= 0) goto end;
 393 #ifndef OPENSSL_NO_TLSEXT
 394                         if (s->hit)
 395                                 {
 396                                 if (s->tlsext_ticket_expected)
 397                                         s->state=SSL3_ST_SW_SESSION_TICKET_A;
 398                                 else
 399                                         s->state=SSL3_ST_SW_CHANGE_A;
 400                                 }
 401 #else
 402                         if (s->hit)
 403                                         s->state=SSL3_ST_SW_CHANGE_A;
 404 #endif
 405                         else
 406 #ifndef OPENSSL_NO_TLSEXT
 407                                 s->state = SSL3_ST_SW_SUPPLEMENTAL_DATA_A;
 408 #else
 409                         s->state = SSL3_ST_SW_CERT_A;
 410 #endif
 411                         s->init_num = 0;
 412                         break;
 413
 414 #ifndef OPENSSL_NO_TLSEXT
 415                 case SSL3_ST_SW_SUPPLEMENTAL_DATA_A:
 416                 case SSL3_ST_SW_SUPPLEMENTAL_DATA_B:
 417                         /* We promised to send an audit proof in the hello. */
 418                         if (s->s3->tlsext_authz_promised_to_client)
 419                                 {
 420                                 ret = tls1_send_server_supplemental_data(s);
 421                                 if (ret <= 0) goto end;
 422                                 }
 423                         else
 424                                 skip = 1;
 425
 426                         s->state = SSL3_ST_SW_CERT_A;
 427                         s->init_num = 0;
 428                         break;
 429 #endif
 430
 431                 case SSL3_ST_SW_CERT_A:
 432                 case SSL3_ST_SW_CERT_B:
 433                         /* Check if it is anon DH or anon ECDH, */
 434                         /* normal PSK or KRB5 or SRP */
 435                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
 436                                 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)
 437                                 && !(s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
 438                                 {
 439                                 ret=ssl3_send_server_certificate(s);
 440                                 if (ret <= 0) goto end;
 441 #ifndef OPENSSL_NO_TLSEXT
 442                                 if (s->tlsext_status_expected)
 443                                         s->state=SSL3_ST_SW_CERT_STATUS_A;
 444                                 else
 445                                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 446                                 }
 447                         else
 448                                 {
 449                                 skip = 1;
 450                                 s->state=SSL3_ST_SW_KEY_EXCH_A;
 451                                 }
 452 #else
 453                                 }
 454                         else
 455                                 skip=1;
 456
 457                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 458 #endif
 459                         s->init_num=0;
 460                         break;
 461
 462                 case SSL3_ST_SW_KEY_EXCH_A:
 463                 case SSL3_ST_SW_KEY_EXCH_B:
 464                         alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
 465
 466                         /* clear this, it may get reset by
 467                          * send_server_key_exchange */
 468                         if ((s->options & SSL_OP_EPHEMERAL_RSA)
 469 #ifndef OPENSSL_NO_KRB5
 470                                 && !(alg_k & SSL_kKRB5)
 471 #endif /* OPENSSL_NO_KRB5 */
 472                                 )
 473                                 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
 474                                  * even when forbidden by protocol specs
 475                                  * (handshake may fail as clients are not required to
 476                                  * be able to handle this) */
 477                                 s->s3->tmp.use_rsa_tmp=1;
 478                         else
 479                                 s->s3->tmp.use_rsa_tmp=0;
 480
 481
 482                         /* only send if a DH key exchange, fortezza or
 483                          * RSA but we have a sign only certificate
 484                          *
 485                          * PSK: may send PSK identity hints
 486                          *
 487                          * For ECC ciphersuites, we send a serverKeyExchange
 488                          * message only if the cipher suite is either
 489                          * ECDH-anon or ECDHE. In other cases, the
 490                          * server certificate contains the server's
 491                          * public key for key exchange.
 492                          */
 493                         if (s->s3->tmp.use_rsa_tmp
 494                         /* PSK: send ServerKeyExchange if PSK identity
 495                          * hint if provided */
 496 #ifndef OPENSSL_NO_PSK
 497                             || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
 498 #endif
 499 #ifndef OPENSSL_NO_SRP
 500                             /* SRP: send ServerKeyExchange */
 501                             || (alg_k & SSL_kSRP)
 502 #endif
 503                             || (alg_k & SSL_kEDH)
 504                             || (alg_k & SSL_kEECDH)
 505                             || ((alg_k & SSL_kRSA)
 506                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
 507                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
 508                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
 509                                         )
 510                                     )
 511                                 )
 512                             )
 513                                 {
 514                                 ret=ssl3_send_server_key_exchange(s);
 515                                 if (ret <= 0) goto end;
 516                                 }
 517                         else
 518                                 skip=1;
 519
 520                         s->state=SSL3_ST_SW_CERT_REQ_A;
 521                         s->init_num=0;
 522                         break;
 523
 524                 case SSL3_ST_SW_CERT_REQ_A:
 525                 case SSL3_ST_SW_CERT_REQ_B:
 526                         if (/* don't request cert unless asked for it: */
 527                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
 528                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
 529                                  * don't request cert during re-negotiation: */
 530                                 ((s->session->peer != NULL) &&
 531                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
 532                                 /* never request cert in anonymous ciphersuites
 533                                  * (see section "Certificate request" in SSL 3 drafts
 534                                  * and in RFC 2246): */
 535                                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
 536                                  /* ... except when the application insists on verification
 537                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
 538                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
 539                                  /* never request cert in Kerberos ciphersuites */
 540                                 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5)
 541                                 /* With normal PSK Certificates and
 542                                  * Certificate Requests are omitted */
 543                                 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 544                                 {
 545                                 /* no cert request */
 546                                 skip=1;
 547                                 s->s3->tmp.cert_request=0;
 548                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 549                                 if (s->s3->handshake_buffer)
 550                                         if (!ssl3_digest_cached_records(s))
 551                                                 return -1;
 552                                 }
 553                         else
 554                                 {
 555                                 s->s3->tmp.cert_request=1;
 556                                 ret=ssl3_send_certificate_request(s);
 557                                 if (ret <= 0) goto end;
 558 #ifndef NETSCAPE_HANG_BUG
 559                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 560 #else
 561                                 s->state=SSL3_ST_SW_FLUSH;
 562                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 563 #endif
 564                                 s->init_num=0;
 565                                 }
 566                         break;
 567
 568                 case SSL3_ST_SW_SRVR_DONE_A:
 569                 case SSL3_ST_SW_SRVR_DONE_B:
 570                         ret=ssl3_send_server_done(s);
 571                         if (ret <= 0) goto end;
 572                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 573                         s->state=SSL3_ST_SW_FLUSH;
 574                         s->init_num=0;
 575                         break;
 576
 577                 case SSL3_ST_SW_FLUSH:
 578
 579                         /* This code originally checked to see if
 580                          * any data was pending using BIO_CTRL_INFO
 581                          * and then flushed. This caused problems
 582                          * as documented in PR#1939. The proposed
 583                          * fix doesn't completely resolve this issue
 584                          * as buggy implementations of BIO_CTRL_PENDING
 585                          * still exist. So instead we just flush
 586                          * unconditionally.
 587                          */
 588
 589                         s->rwstate=SSL_WRITING;
 590                         if (BIO_flush(s->wbio) <= 0)
 591                                 {
 592                                 ret= -1;
 593                                 goto end;
 594                                 }
 595                         s->rwstate=SSL_NOTHING;
 596
 597                         s->state=s->s3->tmp.next_state;
 598                         break;
 599
 600                 case SSL3_ST_SR_CERT_A:
 601                 case SSL3_ST_SR_CERT_B:
 602                         /* Check for second client hello (MS SGC) */
 603                         ret = ssl3_check_client_hello(s);
 604                         if (ret <= 0)
 605                                 goto end;
 606                         if (ret == 2)
 607                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
 608                         else {
 609                                 if (s->s3->tmp.cert_request)
 610                                         {
 611                                         ret=ssl3_get_client_certificate(s);
 612                                         if (ret <= 0) goto end;
 613                                         }
 614                                 s->init_num=0;
 615                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
 616                         }
 617                         break;
 618
 619                 case SSL3_ST_SR_KEY_EXCH_A:
 620                 case SSL3_ST_SR_KEY_EXCH_B:
 621                         ret=ssl3_get_client_key_exchange(s);
 622                         if (ret <= 0)
 623                                 goto end;
 624                         if (ret == 2)
 625                                 {
 626                                 /* For the ECDH ciphersuites when
 627                                  * the client sends its ECDH pub key in
 628                                  * a certificate, the CertificateVerify
 629                                  * message is not sent.
 630                                  * Also for GOST ciphersuites when
 631                                  * the client uses its key from the certificate
 632                                  * for key exchange.
 633                                  */
 634 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
 635                                 s->state=SSL3_ST_SR_FINISHED_A;
 636 #else
 637                                 if (s->s3->next_proto_neg_seen)
 638                                         s->state=SSL3_ST_SR_NEXT_PROTO_A;
 639                                 else
 640                                         s->state=SSL3_ST_SR_FINISHED_A;
 641 #endif
 642                                 s->init_num = 0;
 643                                 }
 644                         else if (TLS1_get_version(s) >= TLS1_2_VERSION)
 645                                 {
 646                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
 647                                 s->init_num=0;
 648                                 if (!s->session->peer)
 649                                         break;
 650                                 /* For TLS v1.2 freeze the handshake buffer
 651                                  * at this point and digest cached records.
 652                                  */
 653                                 if (!s->s3->handshake_buffer)
 654                                         {
 655                                         SSLerr(SSL_F_SSL3_ACCEPT,ERR_R_INTERNAL_ERROR);
 656                                         return -1;
 657                                         }
 658                                 s->s3->flags |= TLS1_FLAGS_KEEP_HANDSHAKE;
 659                                 if (!ssl3_digest_cached_records(s))
 660                                         return -1;
 661                                 }
 662                         else
 663                                 {
 664                                 int offset=0;
 665                                 int dgst_num;
 666
 667                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
 668                                 s->init_num=0;
 669
 670                                 /* We need to get hashes here so if there is
 671                                  * a client cert, it can be verified
 672                                  * FIXME - digest processing for CertificateVerify
 673                                  * should be generalized. But it is next step
 674                                  */
 675                                 if (s->s3->handshake_buffer)
 676                                         if (!ssl3_digest_cached_records(s))
 677                                                 return -1;
 678                                 for (dgst_num=0; dgst_num<SSL_MAX_DIGEST;dgst_num++)
 679                                         if (s->s3->handshake_dgst[dgst_num])
 680                                                 {
 681                                                 int dgst_size;
 682
 683                                                 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]));
 684                                                 dgst_size=EVP_MD_CTX_size(s->s3->handshake_dgst[dgst_num]);
 685                                                 if (dgst_size < 0)
 686                                                         {
 687                                                         ret = -1;
 688                                                         goto end;
 689                                                         }
 690                                                 offset+=dgst_size;
 691                                                 }
 692                                 }
 693                         break;
 694
 695                 case SSL3_ST_SR_CERT_VRFY_A:
 696                 case SSL3_ST_SR_CERT_VRFY_B:
 697
 698                         /* we should decide if we expected this one */
 699                         ret=ssl3_get_cert_verify(s);
 700                         if (ret <= 0) goto end;
 701
 702 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
 703                         s->state=SSL3_ST_SR_FINISHED_A;
 704 #else
 705                         if (s->s3->next_proto_neg_seen)
 706                                 s->state=SSL3_ST_SR_NEXT_PROTO_A;
 707                         else
 708                                 s->state=SSL3_ST_SR_FINISHED_A;
 709 #endif
 710                         s->init_num=0;
 711                         break;
 712
 713 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
 714                 case SSL3_ST_SR_NEXT_PROTO_A:
 715                 case SSL3_ST_SR_NEXT_PROTO_B:
 716                         ret=ssl3_get_next_proto(s);
 717                         if (ret <= 0) goto end;
 718                         s->init_num = 0;
 719                         s->state=SSL3_ST_SR_FINISHED_A;
 720                         break;
 721 #endif
 722
 723                 case SSL3_ST_SR_FINISHED_A:
 724                 case SSL3_ST_SR_FINISHED_B:
 725                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
 726                                 SSL3_ST_SR_FINISHED_B);
 727                         if (ret <= 0) goto end;
 728                         if (s->hit)
 729                                 s->state=SSL_ST_OK;
 730 #ifndef OPENSSL_NO_TLSEXT
 731                         else if (s->tlsext_ticket_expected)
 732                                 s->state=SSL3_ST_SW_SESSION_TICKET_A;
 733 #endif
 734                         else
 735                                 s->state=SSL3_ST_SW_CHANGE_A;
 736                         s->init_num=0;
 737                         break;
 738
 739 #ifndef OPENSSL_NO_TLSEXT
 740                 case SSL3_ST_SW_SESSION_TICKET_A:
 741                 case SSL3_ST_SW_SESSION_TICKET_B:
 742                         ret=ssl3_send_newsession_ticket(s);
 743                         if (ret <= 0) goto end;
 744                         s->state=SSL3_ST_SW_CHANGE_A;
 745                         s->init_num=0;
 746                         break;
 747
 748                 case SSL3_ST_SW_CERT_STATUS_A:
 749                 case SSL3_ST_SW_CERT_STATUS_B:
 750                         ret=ssl3_send_cert_status(s);
 751                         if (ret <= 0) goto end;
 752                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 753                         s->init_num=0;
 754                         break;
 755
 756 #endif
 757
 758                 case SSL3_ST_SW_CHANGE_A:
 759                 case SSL3_ST_SW_CHANGE_B:
 760
 761                         s->session->cipher=s->s3->tmp.new_cipher;
 762                         if (!s->method->ssl3_enc->setup_key_block(s))
 763                                 { ret= -1; goto end; }
 764
 765                         ret=ssl3_send_change_cipher_spec(s,
 766                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
 767
 768                         if (ret <= 0) goto end;
 769                         s->state=SSL3_ST_SW_FINISHED_A;
 770                         s->init_num=0;
 771
 772                         if (!s->method->ssl3_enc->change_cipher_state(s,
 773                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
 774                                 {
 775                                 ret= -1;
 776                                 goto end;
 777                                 }
 778
 779                         break;
 780
 781                 case SSL3_ST_SW_FINISHED_A:
 782                 case SSL3_ST_SW_FINISHED_B:
 783                         ret=ssl3_send_finished(s,
 784                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
 785                                 s->method->ssl3_enc->server_finished_label,
 786                                 s->method->ssl3_enc->server_finished_label_len);
 787                         if (ret <= 0) goto end;
 788                         s->state=SSL3_ST_SW_FLUSH;
 789                         if (s->hit)
 790                                 {
 791 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
 792                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 793 #else
 794                                 if (s->s3->next_proto_neg_seen)
 795                                         s->s3->tmp.next_state=SSL3_ST_SR_NEXT_PROTO_A;
 796                                 else
 797                                         s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 798 #endif
 799                                 }
 800                         else
 801                                 s->s3->tmp.next_state=SSL_ST_OK;
 802                         s->init_num=0;
 803                         break;
 804
 805                 case SSL_ST_OK:
 806                         /* clean a few things up */
 807                         ssl3_cleanup_key_block(s);
 808
 809                         BUF_MEM_free(s->init_buf);
 810                         s->init_buf=NULL;
 811
 812                         /* remove buffering on output */
 813                         ssl_free_wbio_buffer(s);
 814
 815                         s->init_num=0;
 816
 817                         if (s->renegotiate == 2) /* skipped if we just sent a HelloRequest */
 818                                 {
 819                                 s->renegotiate=0;
 820                                 s->new_session=0;
 821
 822                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 823
 824                                 s->ctx->stats.sess_accept_good++;
 825                                 /* s->server=1; */
 826                                 s->handshake_func=ssl3_accept;
 827
 828                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 829                                 }
 830
 831                         ret = 1;
 832                         goto end;
 833                         /* break; */
 834
 835                 default:
 836                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
 837                         ret= -1;
 838                         goto end;
 839                         /* break; */
 840                         }
 841
 842                 if (!s->s3->tmp.reuse_message && !skip)
 843                         {
 844                         if (s->debug)
 845                                 {
 846                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 847                                         goto end;
 848                                 }
 849
 850
 851                         if ((cb != NULL) && (s->state != state))
 852                                 {
 853                                 new_state=s->state;
 854                                 s->state=state;
 855                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
 856                                 s->state=new_state;
 857                                 }
 858                         }
 859                 skip=0;
 860                 }
 861 end:
 862         /* BIO_flush(s->wbio); */
 863
 864         s->in_handshake--;
 865         if (cb != NULL)
 866                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 867         return(ret);
 868         }
 869
 870 int ssl3_send_hello_request(SSL *s)
 871         {
 872         unsigned char *p;
 873
 874         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
 875                 {
 876                 p=(unsigned char *)s->init_buf->data;
 877                 *(p++)=SSL3_MT_HELLO_REQUEST;
 878                 *(p++)=0;
 879                 *(p++)=0;
 880                 *(p++)=0;
 881
 882                 s->state=SSL3_ST_SW_HELLO_REQ_B;
 883                 /* number of bytes to write */
 884                 s->init_num=4;
 885                 s->init_off=0;
 886                 }
 887
 888         /* SSL3_ST_SW_HELLO_REQ_B */
 889         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 890         }
 891
 892 int ssl3_check_client_hello(SSL *s)
 893         {
 894         int ok;
 895         long n;
 896
 897         /* this function is called when we really expect a Certificate message,
 898          * so permit appropriate message length */
 899         n=s->method->ssl_get_message(s,
 900                 SSL3_ST_SR_CERT_A,
 901                 SSL3_ST_SR_CERT_B,
 902                 -1,
 903                 s->max_cert_list,
 904                 &ok);
 905         if (!ok) return((int)n);
 906         s->s3->tmp.reuse_message = 1;
 907         if (s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO)
 908                 {
 909                 /* We only allow the client to restart the handshake once per
 910                  * negotiation. */
 911                 if (s->s3->flags & SSL3_FLAGS_SGC_RESTART_DONE)
 912                         {
 913                         SSLerr(SSL_F_SSL3_CHECK_CLIENT_HELLO, SSL_R_MULTIPLE_SGC_RESTARTS);
 914                         return -1;
 915                         }
 916                 /* Throw away what we have done so far in the current handshake,
 917                  * which will now be aborted. (A full SSL_clear would be too much.) */
 918 #ifndef OPENSSL_NO_DH
 919                 if (s->s3->tmp.dh != NULL)
 920                         {
 921                         DH_free(s->s3->tmp.dh);
 922                         s->s3->tmp.dh = NULL;
 923                         }
 924 #endif
 925 #ifndef OPENSSL_NO_ECDH
 926                 if (s->s3->tmp.ecdh != NULL)
 927                         {
 928                         EC_KEY_free(s->s3->tmp.ecdh);
 929                         s->s3->tmp.ecdh = NULL;
 930                         }
 931 #endif
 932                 s->s3->flags |= SSL3_FLAGS_SGC_RESTART_DONE;
 933                 return 2;
 934                 }
 935         return 1;
 936 }
 937
 938 int ssl3_get_client_hello(SSL *s)
 939         {
 940         int i,j,ok,al=SSL_AD_INTERNAL_ERROR,ret= -1;
 941         unsigned int cookie_len;
 942         long n;
 943         unsigned long id;
 944         unsigned char *p,*d,*q;
 945         SSL_CIPHER *c;
 946 #ifndef OPENSSL_NO_COMP
 947         SSL_COMP *comp=NULL;
 948 #endif
 949         STACK_OF(SSL_CIPHER) *ciphers=NULL;
 950
 951         /* We do this so that we will respond with our native type.
 952          * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
 953          * This down switching should be handled by a different method.
 954          * If we are SSLv3, we will respond with SSLv3, even if prompted with
 955          * TLSv1.
 956          */
 957         if (s->state == SSL3_ST_SR_CLNT_HELLO_A
 958                 )
 959                 {
 960                 s->state=SSL3_ST_SR_CLNT_HELLO_B;
 961                 }
 962         s->first_packet=1;
 963         n=s->method->ssl_get_message(s,
 964                 SSL3_ST_SR_CLNT_HELLO_B,
 965                 SSL3_ST_SR_CLNT_HELLO_C,
 966                 SSL3_MT_CLIENT_HELLO,
 967                 SSL3_RT_MAX_PLAIN_LENGTH,
 968                 &ok);
 969
 970         if (!ok) return((int)n);
 971         s->first_packet=0;
 972         d=p=(unsigned char *)s->init_msg;
 973
 974         /* use version from inside client hello, not from record header
 975          * (may differ: see RFC 2246, Appendix E, second paragraph) */
 976         s->client_version=(((int)p[0])<<8)|(int)p[1];
 977         p+=2;
 978
 979         if ((s->version == DTLS1_VERSION && s->client_version > s->version) ||
 980             (s->version != DTLS1_VERSION && s->client_version < s->version))
 981                 {
 982                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER);
 983                 if ((s->client_version>>8) == SSL3_VERSION_MAJOR)
 984                         {
 985                         /* similar to ssl3_get_record, send alert using remote version number */
 986                         s->version = s->client_version;
 987                         }
 988                 al = SSL_AD_PROTOCOL_VERSION;
 989                 goto f_err;
 990                 }
 991
 992         /* If we require cookies and this ClientHello doesn't
 993          * contain one, just return since we do not want to
 994          * allocate any memory yet. So check cookie length...
 995          */
 996         if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)
 997                 {
 998                 unsigned int session_length, cookie_length;
 999
1000                 session_length = *(p + SSL3_RANDOM_SIZE);
1001                 cookie_length = *(p + SSL3_RANDOM_SIZE + session_length + 1);
1002
1003                 if (cookie_length == 0)
1004                         return 1;
1005                 }
1006
1007         /* load the client random */
1008         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
1009         p+=SSL3_RANDOM_SIZE;
1010
1011         /* get the session-id */
1012         j= *(p++);
1013
1014         s->hit=0;
1015         /* Versions before 0.9.7 always allow clients to resume sessions in renegotiation.
1016          * 0.9.7 and later allow this by default, but optionally ignore resumption requests
1017          * with flag SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION (it's a new flag rather
1018          * than a change to default behavior so that applications relying on this for security
1019          * won't even compile against older library versions).
1020          *
1021          * 1.0.1 and later also have a function SSL_renegotiate_abbreviated() to request
1022          * renegotiation but not a new session (s->new_session remains unset): for servers,
1023          * this essentially just means that the SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
1024          * setting will be ignored.
1025          */
1026         if ((s->new_session && (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION)))
1027                 {
1028                 if (!ssl_get_new_session(s,1))
1029                         goto err;
1030                 }
1031         else
1032                 {
1033                 i=ssl_get_prev_session(s, p, j, d + n);
1034                 if (i == 1)
1035                         { /* previous session */
1036                         s->hit=1;
1037                         }
1038                 else if (i == -1)
1039                         goto err;
1040                 else /* i == 0 */
1041                         {
1042                         if (!ssl_get_new_session(s,1))
1043                                 goto err;
1044                         }
1045                 }
1046
1047         p+=j;
1048
1049         if (s->version == DTLS1_VERSION || s->version == DTLS1_BAD_VER)
1050                 {
1051                 /* cookie stuff */
1052                 cookie_len = *(p++);
1053
1054                 /*
1055                  * The ClientHello may contain a cookie even if the
1056                  * HelloVerify message has not been sent--make sure that it
1057                  * does not cause an overflow.
1058                  */
1059                 if ( cookie_len > sizeof(s->d1->rcvd_cookie))
1060                         {
1061                         /* too much data */
1062                         al = SSL_AD_DECODE_ERROR;
1063                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
1064                         goto f_err;
1065                         }
1066
1067                 /* verify the cookie if appropriate option is set. */
1068                 if ((SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) &&
1069                         cookie_len > 0)
1070                         {
1071                         memcpy(s->d1->rcvd_cookie, p, cookie_len);
1072
1073                         if ( s->ctx->app_verify_cookie_cb != NULL)
1074                                 {
1075                                 if ( s->ctx->app_verify_cookie_cb(s, s->d1->rcvd_cookie,
1076                                         cookie_len) == 0)
1077                                         {
1078                                         al=SSL_AD_HANDSHAKE_FAILURE;
1079                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
1080                                                 SSL_R_COOKIE_MISMATCH);
1081                                         goto f_err;
1082                                         }
1083                                 /* else cookie verification succeeded */
1084                                 }
1085                         else if ( memcmp(s->d1->rcvd_cookie, s->d1->cookie,
1086                                                   s->d1->cookie_len) != 0) /* default verification */
1087                                 {
1088                                         al=SSL_AD_HANDSHAKE_FAILURE;
1089                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
1090                                                 SSL_R_COOKIE_MISMATCH);
1091                                         goto f_err;
1092                                 }
1093
1094                         ret = 2;
1095                         }
1096
1097                 p += cookie_len;
1098                 }
1099
1100         n2s(p,i);
1101         if ((i == 0) && (j != 0))
1102                 {
1103                 /* we need a cipher if we are not resuming a session */
1104                 al=SSL_AD_ILLEGAL_PARAMETER;
1105                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
1106                 goto f_err;
1107                 }
1108         if ((p+i) >= (d+n))
1109                 {
1110                 /* not enough data */
1111                 al=SSL_AD_DECODE_ERROR;
1112                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
1113                 goto f_err;
1114                 }
1115         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
1116                 == NULL))
1117                 {
1118                 goto err;
1119                 }
1120         p+=i;
1121
1122         /* If it is a hit, check that the cipher is in the list */
1123         if ((s->hit) && (i > 0))
1124                 {
1125                 j=0;
1126                 id=s->session->cipher->id;
1127
1128 #ifdef CIPHER_DEBUG
1129                 printf("client sent %d ciphers\n",sk_num(ciphers));
1130 #endif
1131                 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
1132                         {
1133                         c=sk_SSL_CIPHER_value(ciphers,i);
1134 #ifdef CIPHER_DEBUG
1135                         printf("client [%2d of %2d]:%s\n",
1136                                 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
1137 #endif
1138                         if (c->id == id)
1139                                 {
1140                                 j=1;
1141                                 break;
1142                                 }
1143                         }
1144 /* Disabled because it can be used in a ciphersuite downgrade
1145  * attack: CVE-2010-4180.
1146  */
1147 #if 0
1148                 if (j == 0 && (s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
1149                         {
1150                         /* Special case as client bug workaround: the previously used cipher may
1151                          * not be in the current list, the client instead might be trying to
1152                          * continue using a cipher that before wasn't chosen due to server
1153                          * preferences.  We'll have to reject the connection if the cipher is not
1154                          * enabled, though. */
1155                         c = sk_SSL_CIPHER_value(ciphers, 0);
1156                         if (sk_SSL_CIPHER_find(SSL_get_ciphers(s), c) >= 0)
1157                                 {
1158                                 s->session->cipher = c;
1159                                 j = 1;
1160                                 }
1161                         }
1162 #endif
1163                 if (j == 0)
1164                         {
1165                         /* we need to have the cipher in the cipher
1166                          * list if we are asked to reuse it */
1167                         al=SSL_AD_ILLEGAL_PARAMETER;
1168                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
1169                         goto f_err;
1170                         }
1171                 }
1172
1173         /* compression */
1174         i= *(p++);
1175         if ((p+i) > (d+n))
1176                 {
1177                 /* not enough data */
1178                 al=SSL_AD_DECODE_ERROR;
1179                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
1180                 goto f_err;
1181                 }
1182         q=p;
1183         for (j=0; j<i; j++)
1184                 {
1185                 if (p[j] == 0) break;
1186                 }
1187
1188         p+=i;
1189         if (j >= i)
1190                 {
1191                 /* no compress */
1192                 al=SSL_AD_DECODE_ERROR;
1193                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
1194                 goto f_err;
1195                 }
1196
1197 #ifndef OPENSSL_NO_TLSEXT
1198         /* TLS extensions*/
1199         if (s->version >= SSL3_VERSION)
1200                 {
1201                 if (!ssl_parse_clienthello_tlsext(s,&p,d,n))
1202                         {
1203                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_PARSE_TLSEXT);
1204                         goto err;
1205                         }
1206                 }
1207
1208         /* Check if we want to use external pre-shared secret for this
1209          * handshake for not reused session only. We need to generate
1210          * server_random before calling tls_session_secret_cb in order to allow
1211          * SessionTicket processing to use it in key derivation. */
1212         {
1213                 unsigned long Time;
1214                 unsigned char *pos;
1215                 Time=(unsigned long)time(NULL);                 /* Time */
1216                 pos=s->s3->server_random;
1217                 l2n(Time,pos);
1218                 if (RAND_pseudo_bytes(pos,SSL3_RANDOM_SIZE-4) <= 0)
1219                         {
1220                         goto f_err;
1221                         }
1222         }
1223
1224         if (!s->hit && s->version >= TLS1_VERSION && s->tls_session_secret_cb)
1225                 {
1226                 SSL_CIPHER *pref_cipher=NULL;
1227
1228                 s->session->master_key_length=sizeof(s->session->master_key);
1229                 if(s->tls_session_secret_cb(s, s->session->master_key, &s->session->master_key_length,
1230                         ciphers, &pref_cipher, s->tls_session_secret_cb_arg))
1231                         {
1232                         s->hit=1;
1233                         s->session->ciphers=ciphers;
1234                         s->session->verify_result=X509_V_OK;
1235
1236                         ciphers=NULL;
1237
1238                         /* check if some cipher was preferred by call back */
1239                         pref_cipher=pref_cipher ? pref_cipher : ssl3_choose_cipher(s, s->session->ciphers, SSL_get_ciphers(s));
1240                         if (pref_cipher == NULL)
1241                                 {
1242                                 al=SSL_AD_HANDSHAKE_FAILURE;
1243                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1244                                 goto f_err;
1245                                 }
1246
1247                         s->session->cipher=pref_cipher;
1248
1249                         if (s->cipher_list)
1250                                 sk_SSL_CIPHER_free(s->cipher_list);
1251
1252                         if (s->cipher_list_by_id)
1253                                 sk_SSL_CIPHER_free(s->cipher_list_by_id);
1254
1255                         s->cipher_list = sk_SSL_CIPHER_dup(s->session->ciphers);
1256                         s->cipher_list_by_id = sk_SSL_CIPHER_dup(s->session->ciphers);
1257                         }
1258                 }
1259 #endif
1260
1261         /* Worst case, we will use the NULL compression, but if we have other
1262          * options, we will now look for them.  We have i-1 compression
1263          * algorithms from the client, starting at q. */
1264         s->s3->tmp.new_compression=NULL;
1265 #ifndef OPENSSL_NO_COMP
1266         /* This only happens if we have a cache hit */
1267         if (s->session->compress_meth != 0)
1268                 {
1269                 int m, comp_id = s->session->compress_meth;
1270                 /* Perform sanity checks on resumed compression algorithm */
1271                 /* Can't disable compression */
1272                 if (s->options & SSL_OP_NO_COMPRESSION)
1273                         {
1274                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1275                         goto f_err;
1276                         }
1277                 /* Look for resumed compression method */
1278                 for (m = 0; m < sk_SSL_COMP_num(s->ctx->comp_methods); m++)
1279                         {
1280                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1281                         if (comp_id == comp->id)
1282                                 {
1283                                 s->s3->tmp.new_compression=comp;
1284                                 break;
1285                                 }
1286                         }
1287                 if (s->s3->tmp.new_compression == NULL)
1288                         {
1289                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INVALID_COMPRESSION_ALGORITHM);
1290                         goto f_err;
1291                         }
1292                 /* Look for resumed method in compression list */
1293                 for (m = 0; m < i; m++)
1294                         {
1295                         if (q[m] == comp_id)
1296                                 break;
1297                         }
1298                 if (m >= i)
1299                         {
1300                         al=SSL_AD_ILLEGAL_PARAMETER;
1301                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_COMPRESSSION_ALGORITHM_MISSING);
1302                         goto f_err;
1303                         }
1304                 }
1305         else if (s->hit)
1306                 comp = NULL;
1307         else if (!(s->options & SSL_OP_NO_COMPRESSION) && s->ctx->comp_methods)
1308                 { /* See if we have a match */
1309                 int m,nn,o,v,done=0;
1310
1311                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
1312                 for (m=0; m<nn; m++)
1313                         {
1314                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1315                         v=comp->id;
1316                         for (o=0; o<i; o++)
1317                                 {
1318                                 if (v == q[o])
1319                                         {
1320                                         done=1;
1321                                         break;
1322                                         }
1323                                 }
1324                         if (done) break;
1325                         }
1326                 if (done)
1327                         s->s3->tmp.new_compression=comp;
1328                 else
1329                         comp=NULL;
1330                 }
1331 #else
1332         /* If compression is disabled we'd better not try to resume a session
1333          * using compression.
1334          */
1335         if (s->session->compress_meth != 0)
1336                 {
1337                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1338                 goto f_err;
1339                 }
1340 #endif
1341
1342         /* Given s->session->ciphers and SSL_get_ciphers, we must
1343          * pick a cipher */
1344
1345         if (!s->hit)
1346                 {
1347 #ifdef OPENSSL_NO_COMP
1348                 s->session->compress_meth=0;
1349 #else
1350                 s->session->compress_meth=(comp == NULL)?0:comp->id;
1351 #endif
1352                 if (s->session->ciphers != NULL)
1353                         sk_SSL_CIPHER_free(s->session->ciphers);
1354                 s->session->ciphers=ciphers;
1355                 if (ciphers == NULL)
1356                         {
1357                         al=SSL_AD_ILLEGAL_PARAMETER;
1358                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
1359                         goto f_err;
1360                         }
1361                 /* Let cert callback update server certificates if required */
1362                 if (s->cert->cert_cb
1363                         && s->cert->cert_cb(s, s->cert->cert_cb_arg) <= 0)
1364                         {
1365                         al=SSL_AD_INTERNAL_ERROR;
1366                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_CERT_CB_ERROR);
1367                         goto f_err;
1368                         }
1369                 ciphers=NULL;
1370                 c=ssl3_choose_cipher(s,s->session->ciphers,
1371                                      SSL_get_ciphers(s));
1372
1373                 if (c == NULL)
1374                         {
1375                         al=SSL_AD_HANDSHAKE_FAILURE;
1376                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1377                         goto f_err;
1378                         }
1379                 s->s3->tmp.new_cipher=c;
1380                 }
1381         else
1382                 {
1383                 /* Session-id reuse */
1384 #ifdef REUSE_CIPHER_BUG
1385                 STACK_OF(SSL_CIPHER) *sk;
1386                 SSL_CIPHER *nc=NULL;
1387                 SSL_CIPHER *ec=NULL;
1388
1389                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
1390                         {
1391                         sk=s->session->ciphers;
1392                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
1393                                 {
1394                                 c=sk_SSL_CIPHER_value(sk,i);
1395                                 if (c->algorithm_enc & SSL_eNULL)
1396                                         nc=c;
1397                                 if (SSL_C_IS_EXPORT(c))
1398                                         ec=c;
1399                                 }
1400                         if (nc != NULL)
1401                                 s->s3->tmp.new_cipher=nc;
1402                         else if (ec != NULL)
1403                                 s->s3->tmp.new_cipher=ec;
1404                         else
1405                                 s->s3->tmp.new_cipher=s->session->cipher;
1406                         }
1407                 else
1408 #endif
1409                 s->s3->tmp.new_cipher=s->session->cipher;
1410                 }
1411
1412         if (TLS1_get_version(s) < TLS1_2_VERSION || !(s->verify_mode & SSL_VERIFY_PEER))
1413                 {
1414                 if (!ssl3_digest_cached_records(s))
1415                         goto f_err;
1416                 }
1417
1418         /* we now have the following setup.
1419          * client_random
1420          * cipher_list          - our prefered list of ciphers
1421          * ciphers              - the clients prefered list of ciphers
1422          * compression          - basically ignored right now
1423          * ssl version is set   - sslv3
1424          * s->session           - The ssl session has been setup.
1425          * s->hit               - session reuse flag
1426          * s->tmp.new_cipher    - the new cipher to use.
1427          */
1428
1429         /* Handles TLS extensions that we couldn't check earlier */
1430         if (s->version >= SSL3_VERSION)
1431                 {
1432                 if (ssl_check_clienthello_tlsext_late(s) <= 0)
1433                         {
1434                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT);
1435                         goto err;
1436                         }
1437                 }
1438
1439         if (ret < 0) ret=1;
1440         if (0)
1441                 {
1442 f_err:
1443                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1444                 }
1445 err:
1446         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
1447         return(ret);
1448         }
1449
1450 int ssl3_send_server_hello(SSL *s)
1451         {
1452         unsigned char *buf;
1453         unsigned char *p,*d;
1454         int i,sl;
1455         unsigned long l;
1456 #ifdef OPENSSL_NO_TLSEXT
1457         unsigned long Time;
1458 #endif
1459
1460         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
1461                 {
1462                 buf=(unsigned char *)s->init_buf->data;
1463 #ifdef OPENSSL_NO_TLSEXT
1464                 p=s->s3->server_random;
1465                 /* Generate server_random if it was not needed previously */
1466                 Time=(unsigned long)time(NULL);                 /* Time */
1467                 l2n(Time,p);
1468                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
1469                         return -1;
1470 #endif
1471                 /* Do the message type and length last */
1472                 d=p= &(buf[4]);
1473
1474                 *(p++)=s->version>>8;
1475                 *(p++)=s->version&0xff;
1476
1477                 /* Random stuff */
1478                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
1479                 p+=SSL3_RANDOM_SIZE;
1480
1481                 /* There are several cases for the session ID to send
1482                  * back in the server hello:
1483                  * - For session reuse from the session cache,
1484                  *   we send back the old session ID.
1485                  * - If stateless session reuse (using a session ticket)
1486                  *   is successful, we send back the client's "session ID"
1487                  *   (which doesn't actually identify the session).
1488                  * - If it is a new session, we send back the new
1489                  *   session ID.
1490                  * - However, if we want the new session to be single-use,
1491                  *   we send back a 0-length session ID.
1492                  * s->hit is non-zero in either case of session reuse,
1493                  * so the following won't overwrite an ID that we're supposed
1494                  * to send back.
1495                  */
1496                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)
1497                         && !s->hit)
1498                         s->session->session_id_length=0;
1499
1500                 sl=s->session->session_id_length;
1501                 if (sl > (int)sizeof(s->session->session_id))
1502                         {
1503                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1504                         return -1;
1505                         }
1506                 *(p++)=sl;
1507                 memcpy(p,s->session->session_id,sl);
1508                 p+=sl;
1509
1510                 /* put the cipher */
1511                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
1512                 p+=i;
1513
1514                 /* put the compression method */
1515 #ifdef OPENSSL_NO_COMP
1516                         *(p++)=0;
1517 #else
1518                 if (s->s3->tmp.new_compression == NULL)
1519                         *(p++)=0;
1520                 else
1521                         *(p++)=s->s3->tmp.new_compression->id;
1522 #endif
1523 #ifndef OPENSSL_NO_TLSEXT
1524                 if (ssl_prepare_serverhello_tlsext(s) <= 0)
1525                         {
1526                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
1527                         return -1;
1528                         }
1529                 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
1530                         {
1531                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
1532                         return -1;
1533                         }
1534 #endif
1535                 /* do the header */
1536                 l=(p-d);
1537                 d=buf;
1538                 *(d++)=SSL3_MT_SERVER_HELLO;
1539                 l2n3(l,d);
1540
1541                 s->state=SSL3_ST_SW_SRVR_HELLO_B;
1542                 /* number of bytes to write */
1543                 s->init_num=p-buf;
1544                 s->init_off=0;
1545                 }
1546
1547         /* SSL3_ST_SW_SRVR_HELLO_B */
1548         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1549         }
1550
1551 int ssl3_send_server_done(SSL *s)
1552         {
1553         unsigned char *p;
1554
1555         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1556                 {
1557                 p=(unsigned char *)s->init_buf->data;
1558
1559                 /* do the header */
1560                 *(p++)=SSL3_MT_SERVER_DONE;
1561                 *(p++)=0;
1562                 *(p++)=0;
1563                 *(p++)=0;
1564
1565                 s->state=SSL3_ST_SW_SRVR_DONE_B;
1566                 /* number of bytes to write */
1567                 s->init_num=4;
1568                 s->init_off=0;
1569                 }
1570
1571         /* SSL3_ST_SW_SRVR_DONE_B */
1572         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1573         }
1574
1575 int ssl3_send_server_key_exchange(SSL *s)
1576         {
1577 #ifndef OPENSSL_NO_RSA
1578         unsigned char *q;
1579         int j,num;
1580         RSA *rsa;
1581         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1582         unsigned int u;
1583 #endif
1584 #ifndef OPENSSL_NO_DH
1585         DH *dh=NULL,*dhp;
1586 #endif
1587 #ifndef OPENSSL_NO_ECDH
1588         EC_KEY *ecdh=NULL, *ecdhp;
1589         unsigned char *encodedPoint = NULL;
1590         int encodedlen = 0;
1591         int curve_id = 0;
1592         BN_CTX *bn_ctx = NULL;
1593 #endif
1594         EVP_PKEY *pkey;
1595         const EVP_MD *md = NULL;
1596         unsigned char *p,*d;
1597         int al,i;
1598         unsigned long type;
1599         int n;
1600         CERT *cert;
1601         BIGNUM *r[4];
1602         int nr[4],kn;
1603         BUF_MEM *buf;
1604         EVP_MD_CTX md_ctx;
1605
1606         EVP_MD_CTX_init(&md_ctx);
1607         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1608                 {
1609                 type=s->s3->tmp.new_cipher->algorithm_mkey;
1610                 cert=s->cert;
1611
1612                 buf=s->init_buf;
1613
1614                 r[0]=r[1]=r[2]=r[3]=NULL;
1615                 n=0;
1616 #ifndef OPENSSL_NO_RSA
1617                 if (type & SSL_kRSA)
1618                         {
1619                         rsa=cert->rsa_tmp;
1620                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1621                                 {
1622                                 rsa=s->cert->rsa_tmp_cb(s,
1623                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1624                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1625                                 if(rsa == NULL)
1626                                 {
1627                                         al=SSL_AD_HANDSHAKE_FAILURE;
1628                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1629                                         goto f_err;
1630                                 }
1631                                 RSA_up_ref(rsa);
1632                                 cert->rsa_tmp=rsa;
1633                                 }
1634                         if (rsa == NULL)
1635                                 {
1636                                 al=SSL_AD_HANDSHAKE_FAILURE;
1637                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1638                                 goto f_err;
1639                                 }
1640                         r[0]=rsa->n;
1641                         r[1]=rsa->e;
1642                         s->s3->tmp.use_rsa_tmp=1;
1643                         }
1644                 else
1645 #endif
1646 #ifndef OPENSSL_NO_DH
1647                         if (type & SSL_kEDH)
1648                         {
1649                         dhp=cert->dh_tmp;
1650                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1651                                 dhp=s->cert->dh_tmp_cb(s,
1652                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1653                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1654                         if (dhp == NULL)
1655                                 {
1656                                 al=SSL_AD_HANDSHAKE_FAILURE;
1657                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1658                                 goto f_err;
1659                                 }
1660
1661                         if (s->s3->tmp.dh != NULL)
1662                                 {
1663                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1664                                 goto err;
1665                                 }
1666
1667                         if ((dh=DHparams_dup(dhp)) == NULL)
1668                                 {
1669                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1670                                 goto err;
1671                                 }
1672
1673                         s->s3->tmp.dh=dh;
1674                         if ((dhp->pub_key == NULL ||
1675                              dhp->priv_key == NULL ||
1676                              (s->options & SSL_OP_SINGLE_DH_USE)))
1677                                 {
1678                                 if(!DH_generate_key(dh))
1679                                     {
1680                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1681                                            ERR_R_DH_LIB);
1682                                     goto err;
1683                                     }
1684                                 }
1685                         else
1686                                 {
1687                                 dh->pub_key=BN_dup(dhp->pub_key);
1688                                 dh->priv_key=BN_dup(dhp->priv_key);
1689                                 if ((dh->pub_key == NULL) ||
1690                                         (dh->priv_key == NULL))
1691                                         {
1692                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1693                                         goto err;
1694                                         }
1695                                 }
1696                         r[0]=dh->p;
1697                         r[1]=dh->g;
1698                         r[2]=dh->pub_key;
1699                         }
1700                 else
1701 #endif
1702 #ifndef OPENSSL_NO_ECDH
1703                         if (type & SSL_kEECDH)
1704                         {
1705                         const EC_GROUP *group;
1706
1707                         ecdhp=cert->ecdh_tmp;
1708                         if (s->cert->ecdh_tmp_auto)
1709                                 {
1710                                 /* Get NID of first shared curve */
1711                                 int nid = tls1_shared_curve(s, 0);
1712                                 if (nid != NID_undef)
1713                                         ecdhp = EC_KEY_new_by_curve_name(nid);
1714                                 }
1715                         else if ((ecdhp == NULL) && s->cert->ecdh_tmp_cb)
1716                                 {
1717                                 ecdhp=s->cert->ecdh_tmp_cb(s,
1718                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1719                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1720                                 }
1721                         if (ecdhp == NULL)
1722                                 {
1723                                 al=SSL_AD_HANDSHAKE_FAILURE;
1724                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1725                                 goto f_err;
1726                                 }
1727
1728                         if (s->s3->tmp.ecdh != NULL)
1729                                 {
1730                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1731                                 goto err;
1732                                 }
1733
1734                         /* Duplicate the ECDH structure. */
1735                         if (ecdhp == NULL)
1736                                 {
1737                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1738                                 goto err;
1739                                 }
1740                         if (s->cert->ecdh_tmp_auto)
1741                                 ecdh = ecdhp;
1742                         else if ((ecdh = EC_KEY_dup(ecdhp)) == NULL)
1743                                 {
1744                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1745                                 goto err;
1746                                 }
1747
1748                         s->s3->tmp.ecdh=ecdh;
1749                         if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1750                             (EC_KEY_get0_private_key(ecdh) == NULL) ||
1751                             (s->options & SSL_OP_SINGLE_ECDH_USE))
1752                                 {
1753                                 if(!EC_KEY_generate_key(ecdh))
1754                                     {
1755                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1756                                     goto err;
1757                                     }
1758                                 }
1759
1760                         if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1761                             (EC_KEY_get0_public_key(ecdh)  == NULL) ||
1762                             (EC_KEY_get0_private_key(ecdh) == NULL))
1763                                 {
1764                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1765                                 goto err;
1766                                 }
1767
1768                         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1769                             (EC_GROUP_get_degree(group) > 163))
1770                                 {
1771                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1772                                 goto err;
1773                                 }
1774
1775                         /* XXX: For now, we only support ephemeral ECDH
1776                          * keys over named (not generic) curves. For
1777                          * supported named curves, curve_id is non-zero.
1778                          */
1779                         if ((curve_id =
1780                             tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1781                             == 0)
1782                                 {
1783                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1784                                 goto err;
1785                                 }
1786
1787                         /* Encode the public key.
1788                          * First check the size of encoding and
1789                          * allocate memory accordingly.
1790                          */
1791                         encodedlen = EC_POINT_point2oct(group,
1792                             EC_KEY_get0_public_key(ecdh),
1793                             POINT_CONVERSION_UNCOMPRESSED,
1794                             NULL, 0, NULL);
1795
1796                         encodedPoint = (unsigned char *)
1797                             OPENSSL_malloc(encodedlen*sizeof(unsigned char));
1798                         bn_ctx = BN_CTX_new();
1799                         if ((encodedPoint == NULL) || (bn_ctx == NULL))
1800                                 {
1801                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1802                                 goto err;
1803                                 }
1804
1805
1806                         encodedlen = EC_POINT_point2oct(group,
1807                             EC_KEY_get0_public_key(ecdh),
1808                             POINT_CONVERSION_UNCOMPRESSED,
1809                             encodedPoint, encodedlen, bn_ctx);
1810
1811                         if (encodedlen == 0)
1812                                 {
1813                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1814                                 goto err;
1815                                 }
1816
1817                         BN_CTX_free(bn_ctx);  bn_ctx=NULL;
1818
1819                         /* XXX: For now, we only support named (not
1820                          * generic) curves in ECDH ephemeral key exchanges.
1821                          * In this situation, we need four additional bytes
1822                          * to encode the entire ServerECDHParams
1823                          * structure.
1824                          */
1825                         n = 4 + encodedlen;
1826
1827                         /* We'll generate the serverKeyExchange message
1828                          * explicitly so we can set these to NULLs
1829                          */
1830                         r[0]=NULL;
1831                         r[1]=NULL;
1832                         r[2]=NULL;
1833                         r[3]=NULL;
1834                         }
1835                 else
1836 #endif /* !OPENSSL_NO_ECDH */
1837 #ifndef OPENSSL_NO_PSK
1838                         if (type & SSL_kPSK)
1839                                 {
1840                                 /* reserve size for record length and PSK identity hint*/
1841                                 n+=2+strlen(s->ctx->psk_identity_hint);
1842                                 }
1843                         else
1844 #endif /* !OPENSSL_NO_PSK */
1845 #ifndef OPENSSL_NO_SRP
1846                 if (type & SSL_kSRP)
1847                         {
1848                         if ((s->srp_ctx.N == NULL) ||
1849                                 (s->srp_ctx.g == NULL) ||
1850                                 (s->srp_ctx.s == NULL) ||
1851                                 (s->srp_ctx.B == NULL))
1852                                 {
1853                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_SRP_PARAM);
1854                                 goto err;
1855                                 }
1856                         r[0]=s->srp_ctx.N;
1857                         r[1]=s->srp_ctx.g;
1858                         r[2]=s->srp_ctx.s;
1859                         r[3]=s->srp_ctx.B;
1860                         }
1861                 else
1862 #endif
1863                         {
1864                         al=SSL_AD_HANDSHAKE_FAILURE;
1865                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1866                         goto f_err;
1867                         }
1868                 for (i=0; r[i] != NULL && i<4; i++)
1869                         {
1870                         nr[i]=BN_num_bytes(r[i]);
1871 #ifndef OPENSSL_NO_SRP
1872                         if ((i == 2) && (type & SSL_kSRP))
1873                                 n+=1+nr[i];
1874                         else
1875 #endif
1876                         n+=2+nr[i];
1877                         }
1878
1879                 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1880                         && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
1881                         {
1882                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher,&md))
1883                                 == NULL)
1884                                 {
1885                                 al=SSL_AD_DECODE_ERROR;
1886                                 goto f_err;
1887                                 }
1888                         kn=EVP_PKEY_size(pkey);
1889                         }
1890                 else
1891                         {
1892                         pkey=NULL;
1893                         kn=0;
1894                         }
1895
1896                 if (!BUF_MEM_grow_clean(buf,n+4+kn))
1897                         {
1898                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1899                         goto err;
1900                         }
1901                 d=(unsigned char *)s->init_buf->data;
1902                 p= &(d[4]);
1903
1904                 for (i=0; r[i] != NULL && i<4; i++)
1905                         {
1906 #ifndef OPENSSL_NO_SRP
1907                         if ((i == 2) && (type & SSL_kSRP))
1908                                 {
1909                                 *p = nr[i];
1910                                 p++;
1911                                 }
1912                         else
1913 #endif
1914                         s2n(nr[i],p);
1915                         BN_bn2bin(r[i],p);
1916                         p+=nr[i];
1917                         }
1918
1919 #ifndef OPENSSL_NO_ECDH
1920                 if (type & SSL_kEECDH)
1921                         {
1922                         /* XXX: For now, we only support named (not generic) curves.
1923                          * In this situation, the serverKeyExchange message has:
1924                          * [1 byte CurveType], [2 byte CurveName]
1925                          * [1 byte length of encoded point], followed by
1926                          * the actual encoded point itself
1927                          */
1928                         *p = NAMED_CURVE_TYPE;
1929                         p += 1;
1930                         *p = 0;
1931                         p += 1;
1932                         *p = curve_id;
1933                         p += 1;
1934                         *p = encodedlen;
1935                         p += 1;
1936                         memcpy((unsigned char*)p,
1937                             (unsigned char *)encodedPoint,
1938                             encodedlen);
1939                         OPENSSL_free(encodedPoint);
1940                         encodedPoint = NULL;
1941                         p += encodedlen;
1942                         }
1943 #endif
1944
1945 #ifndef OPENSSL_NO_PSK
1946                 if (type & SSL_kPSK)
1947                         {
1948                         /* copy PSK identity hint */
1949                         s2n(strlen(s->ctx->psk_identity_hint), p);
1950                         strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
1951                         p+=strlen(s->ctx->psk_identity_hint);
1952                         }
1953 #endif
1954
1955                 /* not anonymous */
1956                 if (pkey != NULL)
1957                         {
1958                         /* n is the length of the params, they start at &(d[4])
1959                          * and p points to the space at the end. */
1960 #ifndef OPENSSL_NO_RSA
1961                         if (pkey->type == EVP_PKEY_RSA
1962                                         && TLS1_get_version(s) < TLS1_2_VERSION)
1963                                 {
1964                                 q=md_buf;
1965                                 j=0;
1966                                 for (num=2; num > 0; num--)
1967                                         {
1968                                         EVP_MD_CTX_set_flags(&md_ctx,
1969                                                 EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1970                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1971                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1972                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1973                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1974                                         EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1975                                         EVP_DigestFinal_ex(&md_ctx,q,
1976                                                 (unsigned int *)&i);
1977                                         q+=i;
1978                                         j+=i;
1979                                         }
1980                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1981                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1982                                         {
1983                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1984                                         goto err;
1985                                         }
1986                                 s2n(u,p);
1987                                 n+=u+2;
1988                                 }
1989                         else
1990 #endif
1991                         if (md)
1992                                 {
1993                                 /* For TLS1.2 and later send signature
1994                                  * algorithm */
1995                                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
1996                                         {
1997                                         if (!tls12_get_sigandhash(p, pkey, md))
1998                                                 {
1999                                                 /* Should never happen */
2000                                                 al=SSL_AD_INTERNAL_ERROR;
2001                                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2002                                                 goto f_err;
2003                                                 }
2004                                         p+=2;
2005                                         }
2006 #ifdef SSL_DEBUG
2007                                 fprintf(stderr, "Using hash %s\n",
2008                                                         EVP_MD_name(md));
2009 #endif
2010                                 EVP_SignInit_ex(&md_ctx, md, NULL);
2011                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
2012                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
2013                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
2014                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
2015                                         (unsigned int *)&i,pkey))
2016                                         {
2017                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_EVP);
2018                                         goto err;
2019                                         }
2020                                 s2n(i,p);
2021                                 n+=i+2;
2022                                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
2023                                         n+= 2;
2024                                 }
2025                         else
2026                                 {
2027                                 /* Is this error check actually needed? */
2028                                 al=SSL_AD_HANDSHAKE_FAILURE;
2029                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
2030                                 goto f_err;
2031                                 }
2032                         }
2033
2034                 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
2035                 l2n3(n,d);
2036
2037                 /* we should now have things packed up, so lets send
2038                  * it off */
2039                 s->init_num=n+4;
2040                 s->init_off=0;
2041                 }
2042
2043         s->state = SSL3_ST_SW_KEY_EXCH_B;
2044         EVP_MD_CTX_cleanup(&md_ctx);
2045         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2046 f_err:
2047         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2048 err:
2049 #ifndef OPENSSL_NO_ECDH
2050         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2051         BN_CTX_free(bn_ctx);
2052 #endif
2053         EVP_MD_CTX_cleanup(&md_ctx);
2054         return(-1);
2055         }
2056
2057 int ssl3_send_certificate_request(SSL *s)
2058         {
2059         unsigned char *p,*d;
2060         int i,j,nl,off,n;
2061         STACK_OF(X509_NAME) *sk=NULL;
2062         X509_NAME *name;
2063         BUF_MEM *buf;
2064
2065         if (s->state == SSL3_ST_SW_CERT_REQ_A)
2066                 {
2067                 buf=s->init_buf;
2068
2069                 d=p=(unsigned char *)&(buf->data[4]);
2070
2071                 /* get the list of acceptable cert types */
2072                 p++;
2073                 n=ssl3_get_req_cert_type(s,p);
2074                 d[0]=n;
2075                 p+=n;
2076                 n++;
2077
2078                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
2079                         {
2080                         nl = tls12_get_sig_algs(s, p + 2);
2081                         s2n(nl, p);
2082                         p += nl + 2;
2083                         n += nl + 2;
2084                         }
2085
2086                 off=n;
2087                 p+=2;
2088                 n+=2;
2089
2090                 sk=SSL_get_client_CA_list(s);
2091                 nl=0;
2092                 if (sk != NULL)
2093                         {
2094                         for (i=0; i<sk_X509_NAME_num(sk); i++)
2095                                 {
2096                                 name=sk_X509_NAME_value(sk,i);
2097                                 j=i2d_X509_NAME(name,NULL);
2098                                 if (!BUF_MEM_grow_clean(buf,4+n+j+2))
2099                                         {
2100                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
2101                                         goto err;
2102                                         }
2103                                 p=(unsigned char *)&(buf->data[4+n]);
2104                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
2105                                         {
2106                                         s2n(j,p);
2107                                         i2d_X509_NAME(name,&p);
2108                                         n+=2+j;
2109                                         nl+=2+j;
2110                                         }
2111                                 else
2112                                         {
2113                                         d=p;
2114                                         i2d_X509_NAME(name,&p);
2115                                         j-=2; s2n(j,d); j+=2;
2116                                         n+=j;
2117                                         nl+=j;
2118                                         }
2119                                 }
2120                         }
2121                 /* else no CA names */
2122                 p=(unsigned char *)&(buf->data[4+off]);
2123                 s2n(nl,p);
2124
2125                 d=(unsigned char *)buf->data;
2126                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
2127                 l2n3(n,d);
2128
2129                 /* we should now have things packed up, so lets send
2130                  * it off */
2131
2132                 s->init_num=n+4;
2133                 s->init_off=0;
2134 #ifdef NETSCAPE_HANG_BUG
2135                 p=(unsigned char *)s->init_buf->data + s->init_num;
2136
2137                 /* do the header */
2138                 *(p++)=SSL3_MT_SERVER_DONE;
2139                 *(p++)=0;
2140                 *(p++)=0;
2141                 *(p++)=0;
2142                 s->init_num += 4;
2143 #endif
2144
2145                 s->state = SSL3_ST_SW_CERT_REQ_B;
2146                 }
2147
2148         /* SSL3_ST_SW_CERT_REQ_B */
2149         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2150 err:
2151         return(-1);
2152         }
2153
2154 int ssl3_get_client_key_exchange(SSL *s)
2155         {
2156         int i,al,ok;
2157         long n;
2158         unsigned long alg_k;
2159         unsigned char *p;
2160 #ifndef OPENSSL_NO_RSA
2161         RSA *rsa=NULL;
2162         EVP_PKEY *pkey=NULL;
2163 #endif
2164 #ifndef OPENSSL_NO_DH
2165         BIGNUM *pub=NULL;
2166         DH *dh_srvr, *dh_clnt = NULL;
2167 #endif
2168 #ifndef OPENSSL_NO_KRB5
2169         KSSL_ERR kssl_err;
2170 #endif /* OPENSSL_NO_KRB5 */
2171
2172 #ifndef OPENSSL_NO_ECDH
2173         EC_KEY *srvr_ecdh = NULL;
2174         EVP_PKEY *clnt_pub_pkey = NULL;
2175         EC_POINT *clnt_ecpoint = NULL;
2176         BN_CTX *bn_ctx = NULL;
2177 #endif
2178
2179         n=s->method->ssl_get_message(s,
2180                 SSL3_ST_SR_KEY_EXCH_A,
2181                 SSL3_ST_SR_KEY_EXCH_B,
2182                 SSL3_MT_CLIENT_KEY_EXCHANGE,
2183                 2048, /* ??? */
2184                 &ok);
2185
2186         if (!ok) return((int)n);
2187         p=(unsigned char *)s->init_msg;
2188
2189         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2190
2191 #ifndef OPENSSL_NO_RSA
2192         if (alg_k & SSL_kRSA)
2193                 {
2194                 /* FIX THIS UP EAY EAY EAY EAY */
2195                 if (s->s3->tmp.use_rsa_tmp)
2196                         {
2197                         if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
2198                                 rsa=s->cert->rsa_tmp;
2199                         /* Don't do a callback because rsa_tmp should
2200                          * be sent already */
2201                         if (rsa == NULL)
2202                                 {
2203                                 al=SSL_AD_HANDSHAKE_FAILURE;
2204                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
2205                                 goto f_err;
2206
2207                                 }
2208                         }
2209                 else
2210                         {
2211                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
2212                         if (    (pkey == NULL) ||
2213                                 (pkey->type != EVP_PKEY_RSA) ||
2214                                 (pkey->pkey.rsa == NULL))
2215                                 {
2216                                 al=SSL_AD_HANDSHAKE_FAILURE;
2217                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
2218                                 goto f_err;
2219                                 }
2220                         rsa=pkey->pkey.rsa;
2221                         }
2222
2223                 /* TLS and [incidentally] DTLS{0xFEFF} */
2224                 if (s->version > SSL3_VERSION && s->version != DTLS1_BAD_VER)
2225                         {
2226                         n2s(p,i);
2227                         if (n != i+2)
2228                                 {
2229                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
2230                                         {
2231                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
2232                                         goto err;
2233                                         }
2234                                 else
2235                                         p-=2;
2236                                 }
2237                         else
2238                                 n=i;
2239                         }
2240
2241                 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
2242
2243                 al = -1;
2244
2245                 if (i != SSL_MAX_MASTER_KEY_LENGTH)
2246                         {
2247                         al=SSL_AD_DECODE_ERROR;
2248                         /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT); */
2249                         }
2250
2251                 if ((al == -1) && !((p[0] == (s->client_version>>8)) && (p[1] == (s->client_version & 0xff))))
2252                         {
2253                         /* The premaster secret must contain the same version number as the
2254                          * ClientHello to detect version rollback attacks (strangely, the
2255                          * protocol does not offer such protection for DH ciphersuites).
2256                          * However, buggy clients exist that send the negotiated protocol
2257                          * version instead if the server does not support the requested
2258                          * protocol version.
2259                          * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
2260                         if (!((s->options & SSL_OP_TLS_ROLLBACK_BUG) &&
2261                                 (p[0] == (s->version>>8)) && (p[1] == (s->version & 0xff))))
2262                                 {
2263                                 al=SSL_AD_DECODE_ERROR;
2264                                 /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER); */
2265
2266                                 /* The Klima-Pokorny-Rosa extension of Bleichenbacher's attack
2267                                  * (http://eprint.iacr.org/2003/052/) exploits the version
2268                                  * number check as a "bad version oracle" -- an alert would
2269                                  * reveal that the plaintext corresponding to some ciphertext
2270                                  * made up by the adversary is properly formatted except
2271                                  * that the version number is wrong.  To avoid such attacks,
2272                                  * we should treat this just like any other decryption error. */
2273                                 }
2274                         }
2275
2276                 if (al != -1)
2277                         {
2278                         /* Some decryption failure -- use random value instead as countermeasure
2279                          * against Bleichenbacher's attack on PKCS #1 v1.5 RSA padding
2280                          * (see RFC 2246, section 7.4.7.1). */
2281                         ERR_clear_error();
2282                         i = SSL_MAX_MASTER_KEY_LENGTH;
2283                         p[0] = s->client_version >> 8;
2284                         p[1] = s->client_version & 0xff;
2285                         if (RAND_pseudo_bytes(p+2, i-2) <= 0) /* should be RAND_bytes, but we cannot work around a failure */
2286                                 goto err;
2287                         }
2288
2289                 s->session->master_key_length=
2290                         s->method->ssl3_enc->generate_master_secret(s,
2291                                 s->session->master_key,
2292                                 p,i);
2293                 OPENSSL_cleanse(p,i);
2294                 }
2295         else
2296 #endif
2297 #ifndef OPENSSL_NO_DH
2298                 if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2299                 {
2300                 int idx = -1;
2301                 EVP_PKEY *skey = NULL;
2302                 if (n)
2303                         n2s(p,i);
2304                 else
2305                         i = 0;
2306                 if (n && n != i+2)
2307                         {
2308                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
2309                                 {
2310                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
2311                                 goto err;
2312                                 }
2313                         else
2314                                 {
2315                                 p-=2;
2316                                 i=(int)n;
2317                                 }
2318                         }
2319                 if (alg_k & SSL_kDHr)
2320                         idx = SSL_PKEY_DH_RSA;
2321                 else if (alg_k & SSL_kDHd)
2322                         idx = SSL_PKEY_DH_DSA;
2323                 if (idx >= 0)
2324                         {
2325                         skey = s->cert->pkeys[idx].privatekey;
2326                         if ((skey == NULL) ||
2327                                 (skey->type != EVP_PKEY_DH) ||
2328                                 (skey->pkey.dh == NULL))
2329                                 {
2330                                 al=SSL_AD_HANDSHAKE_FAILURE;
2331                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
2332                                 goto f_err;
2333                                 }
2334                         dh_srvr = skey->pkey.dh;
2335                         }
2336                 else if (s->s3->tmp.dh == NULL)
2337                         {
2338                         al=SSL_AD_HANDSHAKE_FAILURE;
2339                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
2340                         goto f_err;
2341                         }
2342                 else
2343                         dh_srvr=s->s3->tmp.dh;
2344
2345                 if (n == 0L)
2346                         {
2347                         /* Get pubkey from cert */
2348                         EVP_PKEY *clkey=X509_get_pubkey(s->session->peer);
2349                         if (clkey)
2350                                 {
2351                                 if (EVP_PKEY_cmp_parameters(clkey, skey) == 1)
2352                                         dh_clnt = EVP_PKEY_get1_DH(clkey);
2353                                 }
2354                         if (dh_clnt == NULL)
2355                                 {
2356                                 al=SSL_AD_HANDSHAKE_FAILURE;
2357                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
2358                                 goto f_err;
2359                                 }
2360                         EVP_PKEY_free(clkey);
2361                         pub = dh_clnt->pub_key;
2362                         }
2363                 else
2364                         pub=BN_bin2bn(p,i,NULL);
2365                 if (pub == NULL)
2366                         {
2367                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
2368                         goto err;
2369                         }
2370
2371                 i=DH_compute_key(p,pub,dh_srvr);
2372
2373                 if (i <= 0)
2374                         {
2375                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2376                         BN_clear_free(pub);
2377                         goto err;
2378                         }
2379
2380                 DH_free(s->s3->tmp.dh);
2381                 s->s3->tmp.dh=NULL;
2382                 if (dh_clnt)
2383                         DH_free(dh_clnt);
2384                 else
2385                         BN_clear_free(pub);
2386                 pub=NULL;
2387                 s->session->master_key_length=
2388                         s->method->ssl3_enc->generate_master_secret(s,
2389                                 s->session->master_key,p,i);
2390                 OPENSSL_cleanse(p,i);
2391                 if (dh_clnt)
2392                         return 2;
2393                 }
2394         else
2395 #endif
2396 #ifndef OPENSSL_NO_KRB5
2397         if (alg_k & SSL_kKRB5)
2398                 {
2399                 krb5_error_code         krb5rc;
2400                 krb5_data               enc_ticket;
2401                 krb5_data               authenticator;
2402                 krb5_data               enc_pms;
2403                 KSSL_CTX                *kssl_ctx = s->kssl_ctx;
2404                 EVP_CIPHER_CTX          ciph_ctx;
2405                 const EVP_CIPHER        *enc = NULL;
2406                 unsigned char           iv[EVP_MAX_IV_LENGTH];
2407                 unsigned char           pms[SSL_MAX_MASTER_KEY_LENGTH
2408                                                + EVP_MAX_BLOCK_LENGTH];
2409                 int                  padl, outl;
2410                 krb5_timestamp          authtime = 0;
2411                 krb5_ticket_times       ttimes;
2412
2413                 EVP_CIPHER_CTX_init(&ciph_ctx);
2414
2415                 if (!kssl_ctx)  kssl_ctx = kssl_ctx_new();
2416
2417                 n2s(p,i);
2418                 enc_ticket.length = i;
2419
2420                 if (n < (long)(enc_ticket.length + 6))
2421                         {
2422                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2423                                 SSL_R_DATA_LENGTH_TOO_LONG);
2424                         goto err;
2425                         }
2426
2427                 enc_ticket.data = (char *)p;
2428                 p+=enc_ticket.length;
2429
2430                 n2s(p,i);
2431                 authenticator.length = i;
2432
2433                 if (n < (long)(enc_ticket.length + authenticator.length + 6))
2434                         {
2435                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2436                                 SSL_R_DATA_LENGTH_TOO_LONG);
2437                         goto err;
2438                         }
2439
2440                 authenticator.data = (char *)p;
2441                 p+=authenticator.length;
2442
2443                 n2s(p,i);
2444                 enc_pms.length = i;
2445                 enc_pms.data = (char *)p;
2446                 p+=enc_pms.length;
2447
2448                 /* Note that the length is checked again below,
2449                 ** after decryption
2450                 */
2451                 if(enc_pms.length > sizeof pms)
2452                         {
2453                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2454                                SSL_R_DATA_LENGTH_TOO_LONG);
2455                         goto err;
2456                         }
2457
2458                 if (n != (long)(enc_ticket.length + authenticator.length +
2459                                                 enc_pms.length + 6))
2460                         {
2461                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2462                                 SSL_R_DATA_LENGTH_TOO_LONG);
2463                         goto err;
2464                         }
2465
2466                 if ((krb5rc = kssl_sget_tkt(kssl_ctx, &enc_ticket, &ttimes,
2467                                         &kssl_err)) != 0)
2468                         {
2469 #ifdef KSSL_DEBUG
2470                         printf("kssl_sget_tkt rtn %d [%d]\n",
2471                                 krb5rc, kssl_err.reason);
2472                         if (kssl_err.text)
2473                                 printf("kssl_err text= %s\n", kssl_err.text);
2474 #endif  /* KSSL_DEBUG */
2475                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2476                                 kssl_err.reason);
2477                         goto err;
2478                         }
2479
2480                 /*  Note: no authenticator is not considered an error,
2481                 **  but will return authtime == 0.
2482                 */
2483                 if ((krb5rc = kssl_check_authent(kssl_ctx, &authenticator,
2484                                         &authtime, &kssl_err)) != 0)
2485                         {
2486 #ifdef KSSL_DEBUG
2487                         printf("kssl_check_authent rtn %d [%d]\n",
2488                                 krb5rc, kssl_err.reason);
2489                         if (kssl_err.text)
2490                                 printf("kssl_err text= %s\n", kssl_err.text);
2491 #endif  /* KSSL_DEBUG */
2492                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2493                                 kssl_err.reason);
2494                         goto err;
2495                         }
2496
2497                 if ((krb5rc = kssl_validate_times(authtime, &ttimes)) != 0)
2498                         {
2499                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, krb5rc);
2500                         goto err;
2501                         }
2502
2503 #ifdef KSSL_DEBUG
2504                 kssl_ctx_show(kssl_ctx);
2505 #endif  /* KSSL_DEBUG */
2506
2507                 enc = kssl_map_enc(kssl_ctx->enctype);
2508                 if (enc == NULL)
2509                     goto err;
2510
2511                 memset(iv, 0, sizeof iv);       /* per RFC 1510 */
2512
2513                 if (!EVP_DecryptInit_ex(&ciph_ctx,enc,NULL,kssl_ctx->key,iv))
2514                         {
2515                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2516                                 SSL_R_DECRYPTION_FAILED);
2517                         goto err;
2518                         }
2519                 if (!EVP_DecryptUpdate(&ciph_ctx, pms,&outl,
2520                                         (unsigned char *)enc_pms.data, enc_pms.length))
2521                         {
2522                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2523                                 SSL_R_DECRYPTION_FAILED);
2524                         goto err;
2525                         }
2526                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2527                         {
2528                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2529                                 SSL_R_DATA_LENGTH_TOO_LONG);
2530                         goto err;
2531                         }
2532                 if (!EVP_DecryptFinal_ex(&ciph_ctx,&(pms[outl]),&padl))
2533                         {
2534                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2535                                 SSL_R_DECRYPTION_FAILED);
2536                         goto err;
2537                         }
2538                 outl += padl;
2539                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2540                         {
2541                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2542                                 SSL_R_DATA_LENGTH_TOO_LONG);
2543                         goto err;
2544                         }
2545                 if (!((pms[0] == (s->client_version>>8)) && (pms[1] == (s->client_version & 0xff))))
2546                     {
2547                     /* The premaster secret must contain the same version number as the
2548                      * ClientHello to detect version rollback attacks (strangely, the
2549                      * protocol does not offer such protection for DH ciphersuites).
2550                      * However, buggy clients exist that send random bytes instead of
2551                      * the protocol version.
2552                      * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients.
2553                      * (Perhaps we should have a separate BUG value for the Kerberos cipher)
2554                      */
2555                     if (!(s->options & SSL_OP_TLS_ROLLBACK_BUG))
2556                         {
2557                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2558                                SSL_AD_DECODE_ERROR);
2559                         goto err;
2560                         }
2561                     }
2562
2563                 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2564
2565                 s->session->master_key_length=
2566                         s->method->ssl3_enc->generate_master_secret(s,
2567                                 s->session->master_key, pms, outl);
2568
2569                 if (kssl_ctx->client_princ)
2570                         {
2571                         size_t len = strlen(kssl_ctx->client_princ);
2572                         if ( len < SSL_MAX_KRB5_PRINCIPAL_LENGTH )
2573                                 {
2574                                 s->session->krb5_client_princ_len = len;
2575                                 memcpy(s->session->krb5_client_princ,kssl_ctx->client_princ,len);
2576                                 }
2577                         }
2578
2579
2580                 /*  Was doing kssl_ctx_free() here,
2581                 **  but it caused problems for apache.
2582                 **  kssl_ctx = kssl_ctx_free(kssl_ctx);
2583                 **  if (s->kssl_ctx)  s->kssl_ctx = NULL;
2584                 */
2585                 }
2586         else
2587 #endif  /* OPENSSL_NO_KRB5 */
2588
2589 #ifndef OPENSSL_NO_ECDH
2590                 if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2591                 {
2592                 int ret = 1;
2593                 int field_size = 0;
2594                 const EC_KEY   *tkey;
2595                 const EC_GROUP *group;
2596                 const BIGNUM *priv_key;
2597
2598                 /* initialize structures for server's ECDH key pair */
2599                 if ((srvr_ecdh = EC_KEY_new()) == NULL)
2600                         {
2601                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2602                             ERR_R_MALLOC_FAILURE);
2603                         goto err;
2604                         }
2605
2606                 /* Let's get server private key and group information */
2607                 if (alg_k & (SSL_kECDHr|SSL_kECDHe))
2608                         {
2609                         /* use the certificate */
2610                         tkey = s->cert->pkeys[SSL_PKEY_ECC].privatekey->pkey.ec;
2611                         }
2612                 else
2613                         {
2614                         /* use the ephermeral values we saved when
2615                          * generating the ServerKeyExchange msg.
2616                          */
2617                         tkey = s->s3->tmp.ecdh;
2618                         }
2619
2620                 group    = EC_KEY_get0_group(tkey);
2621                 priv_key = EC_KEY_get0_private_key(tkey);
2622
2623                 if (!EC_KEY_set_group(srvr_ecdh, group) ||
2624                     !EC_KEY_set_private_key(srvr_ecdh, priv_key))
2625                         {
2626                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2627                                ERR_R_EC_LIB);
2628                         goto err;
2629                         }
2630
2631                 /* Let's get client's public key */
2632                 if ((clnt_ecpoint = EC_POINT_new(group)) == NULL)
2633                         {
2634                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2635                             ERR_R_MALLOC_FAILURE);
2636                         goto err;
2637                         }
2638
2639                 if (n == 0L)
2640                         {
2641                         /* Client Publickey was in Client Certificate */
2642
2643                          if (alg_k & SSL_kEECDH)
2644                                  {
2645                                  al=SSL_AD_HANDSHAKE_FAILURE;
2646                                  SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
2647                                  goto f_err;
2648                                  }
2649                         if (((clnt_pub_pkey=X509_get_pubkey(s->session->peer))
2650                             == NULL) ||
2651                             (clnt_pub_pkey->type != EVP_PKEY_EC))
2652                                 {
2653                                 /* XXX: For now, we do not support client
2654                                  * authentication using ECDH certificates
2655                                  * so this branch (n == 0L) of the code is
2656                                  * never executed. When that support is
2657                                  * added, we ought to ensure the key
2658                                  * received in the certificate is
2659                                  * authorized for key agreement.
2660                                  * ECDH_compute_key implicitly checks that
2661                                  * the two ECDH shares are for the same
2662                                  * group.
2663                                  */
2664                                 al=SSL_AD_HANDSHAKE_FAILURE;
2665                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2666                                     SSL_R_UNABLE_TO_DECODE_ECDH_CERTS);
2667                                 goto f_err;
2668                                 }
2669
2670                         if (EC_POINT_copy(clnt_ecpoint,
2671                             EC_KEY_get0_public_key(clnt_pub_pkey->pkey.ec)) == 0)
2672                                 {
2673                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2674                                         ERR_R_EC_LIB);
2675                                 goto err;
2676                                 }
2677                         ret = 2; /* Skip certificate verify processing */
2678                         }
2679                 else
2680                         {
2681                         /* Get client's public key from encoded point
2682                          * in the ClientKeyExchange message.
2683                          */
2684                         if ((bn_ctx = BN_CTX_new()) == NULL)
2685                                 {
2686                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2687                                     ERR_R_MALLOC_FAILURE);
2688                                 goto err;
2689                                 }
2690
2691                         /* Get encoded point length */
2692                         i = *p;
2693                         p += 1;
2694                         if (n != 1 + i)
2695                                 {
2696                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2697                                     ERR_R_EC_LIB);
2698                                 goto err;
2699                                 }
2700                         if (EC_POINT_oct2point(group,
2701                             clnt_ecpoint, p, i, bn_ctx) == 0)
2702                                 {
2703                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2704                                     ERR_R_EC_LIB);
2705                                 goto err;
2706                                 }
2707                         /* p is pointing to somewhere in the buffer
2708                          * currently, so set it to the start
2709                          */
2710                         p=(unsigned char *)s->init_buf->data;
2711                         }
2712
2713                 /* Compute the shared pre-master secret */
2714                 field_size = EC_GROUP_get_degree(group);
2715                 if (field_size <= 0)
2716                         {
2717                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2718                                ERR_R_ECDH_LIB);
2719                         goto err;
2720                         }
2721                 i = ECDH_compute_key(p, (field_size+7)/8, clnt_ecpoint, srvr_ecdh, NULL);
2722                 if (i <= 0)
2723                         {
2724                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2725                             ERR_R_ECDH_LIB);
2726                         goto err;
2727                         }
2728
2729                 EVP_PKEY_free(clnt_pub_pkey);
2730                 EC_POINT_free(clnt_ecpoint);
2731                 EC_KEY_free(srvr_ecdh);
2732                 BN_CTX_free(bn_ctx);
2733                 EC_KEY_free(s->s3->tmp.ecdh);
2734                 s->s3->tmp.ecdh = NULL;
2735
2736                 /* Compute the master secret */
2737                 s->session->master_key_length = s->method->ssl3_enc-> \
2738                     generate_master_secret(s, s->session->master_key, p, i);
2739
2740                 OPENSSL_cleanse(p, i);
2741                 return (ret);
2742                 }
2743         else
2744 #endif
2745 #ifndef OPENSSL_NO_PSK
2746                 if (alg_k & SSL_kPSK)
2747                         {
2748                         unsigned char *t = NULL;
2749                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
2750                         unsigned int pre_ms_len = 0, psk_len = 0;
2751                         int psk_err = 1;
2752                         char tmp_id[PSK_MAX_IDENTITY_LEN+1];
2753
2754                         al=SSL_AD_HANDSHAKE_FAILURE;
2755
2756                         n2s(p,i);
2757                         if (n != i+2)
2758                                 {
2759                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2760                                         SSL_R_LENGTH_MISMATCH);
2761                                 goto psk_err;
2762                                 }
2763                         if (i > PSK_MAX_IDENTITY_LEN)
2764                                 {
2765                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2766                                         SSL_R_DATA_LENGTH_TOO_LONG);
2767                                 goto psk_err;
2768                                 }
2769                         if (s->psk_server_callback == NULL)
2770                                 {
2771                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2772                                        SSL_R_PSK_NO_SERVER_CB);
2773                                 goto psk_err;
2774                                 }
2775
2776                         /* Create guaranteed NULL-terminated identity
2777                          * string for the callback */
2778                         memcpy(tmp_id, p, i);
2779                         memset(tmp_id+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
2780                         psk_len = s->psk_server_callback(s, tmp_id,
2781                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
2782                         OPENSSL_cleanse(tmp_id, PSK_MAX_IDENTITY_LEN+1);
2783
2784                         if (psk_len > PSK_MAX_PSK_LEN)
2785                                 {
2786                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2787                                         ERR_R_INTERNAL_ERROR);
2788                                 goto psk_err;
2789                                 }
2790                         else if (psk_len == 0)
2791                                 {
2792                                 /* PSK related to the given identity not found */
2793                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2794                                        SSL_R_PSK_IDENTITY_NOT_FOUND);
2795                                 al=SSL_AD_UNKNOWN_PSK_IDENTITY;
2796                                 goto psk_err;
2797                                 }
2798
2799                         /* create PSK pre_master_secret */
2800                         pre_ms_len=2+psk_len+2+psk_len;
2801                         t = psk_or_pre_ms;
2802                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
2803                         s2n(psk_len, t);
2804                         memset(t, 0, psk_len);
2805                         t+=psk_len;
2806                         s2n(psk_len, t);
2807
2808                         if (s->session->psk_identity != NULL)
2809                                 OPENSSL_free(s->session->psk_identity);
2810                         s->session->psk_identity = BUF_strdup((char *)p);
2811                         if (s->session->psk_identity == NULL)
2812                                 {
2813                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2814                                         ERR_R_MALLOC_FAILURE);
2815                                 goto psk_err;
2816                                 }
2817
2818                         if (s->session->psk_identity_hint != NULL)
2819                                 OPENSSL_free(s->session->psk_identity_hint);
2820                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
2821                         if (s->ctx->psk_identity_hint != NULL &&
2822                                 s->session->psk_identity_hint == NULL)
2823                                 {
2824                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2825                                         ERR_R_MALLOC_FAILURE);
2826                                 goto psk_err;
2827                                 }
2828
2829                         s->session->master_key_length=
2830                                 s->method->ssl3_enc->generate_master_secret(s,
2831                                         s->session->master_key, psk_or_pre_ms, pre_ms_len);
2832                         psk_err = 0;
2833                 psk_err:
2834                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
2835                         if (psk_err != 0)
2836                                 goto f_err;
2837                         }
2838                 else
2839 #endif
2840 #ifndef OPENSSL_NO_SRP
2841                 if (alg_k & SSL_kSRP)
2842                         {
2843                         int param_len;
2844
2845                         n2s(p,i);
2846                         param_len=i+2;
2847                         if (param_len > n)
2848                                 {
2849                                 al=SSL_AD_DECODE_ERROR;
2850                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_SRP_A_LENGTH);
2851                                 goto f_err;
2852                                 }
2853                         if (!(s->srp_ctx.A=BN_bin2bn(p,i,NULL)))
2854                                 {
2855                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_BN_LIB);
2856                                 goto err;
2857                                 }
2858                         if (s->session->srp_username != NULL)
2859                                 OPENSSL_free(s->session->srp_username);
2860                         s->session->srp_username = BUF_strdup(s->srp_ctx.login);
2861                         if (s->session->srp_username == NULL)
2862                                 {
2863                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2864                                         ERR_R_MALLOC_FAILURE);
2865                                 goto err;
2866                                 }
2867
2868                         if ((s->session->master_key_length = SRP_generate_server_master_secret(s,s->session->master_key))<0)
2869                                 {
2870                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2871                                 goto err;
2872                                 }
2873
2874                         p+=i;
2875                         }
2876                 else
2877 #endif  /* OPENSSL_NO_SRP */
2878                 if (alg_k & SSL_kGOST)
2879                         {
2880                         int ret = 0;
2881                         EVP_PKEY_CTX *pkey_ctx;
2882                         EVP_PKEY *client_pub_pkey = NULL, *pk = NULL;
2883                         unsigned char premaster_secret[32], *start;
2884                         size_t outlen=32, inlen;
2885                         unsigned long alg_a;
2886
2887                         /* Get our certificate private key*/
2888                         alg_a = s->s3->tmp.new_cipher->algorithm_auth;
2889                         if (alg_a & SSL_aGOST94)
2890                                 pk = s->cert->pkeys[SSL_PKEY_GOST94].privatekey;
2891                         else if (alg_a & SSL_aGOST01)
2892                                 pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey;
2893
2894                         pkey_ctx = EVP_PKEY_CTX_new(pk,NULL);
2895                         EVP_PKEY_decrypt_init(pkey_ctx);
2896                         /* If client certificate is present and is of the same type, maybe
2897                          * use it for key exchange.  Don't mind errors from
2898                          * EVP_PKEY_derive_set_peer, because it is completely valid to use
2899                          * a client certificate for authorization only. */
2900                         client_pub_pkey = X509_get_pubkey(s->session->peer);
2901                         if (client_pub_pkey)
2902                                 {
2903                                 if (EVP_PKEY_derive_set_peer(pkey_ctx, client_pub_pkey) <= 0)
2904                                         ERR_clear_error();
2905                                 }
2906                         /* Decrypt session key */
2907                         if ((*p!=( V_ASN1_SEQUENCE| V_ASN1_CONSTRUCTED)))
2908                                 {
2909                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2910                                 goto gerr;
2911                                 }
2912                         if (p[1] == 0x81)
2913                                 {
2914                                 start = p+3;
2915                                 inlen = p[2];
2916                                 }
2917                         else if (p[1] < 0x80)
2918                                 {
2919                                 start = p+2;
2920                                 inlen = p[1];
2921                                 }
2922                         else
2923                                 {
2924                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2925                                 goto gerr;
2926                                 }
2927                         if (EVP_PKEY_decrypt(pkey_ctx,premaster_secret,&outlen,start,inlen) <=0)
2928
2929                                 {
2930                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2931                                 goto gerr;
2932                                 }
2933                         /* Generate master secret */
2934                         s->session->master_key_length=
2935                                 s->method->ssl3_enc->generate_master_secret(s,
2936                                         s->session->master_key,premaster_secret,32);
2937                         /* Check if pubkey from client certificate was used */
2938                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
2939                                 ret = 2;
2940                         else
2941                                 ret = 1;
2942                 gerr:
2943                         EVP_PKEY_free(client_pub_pkey);
2944                         EVP_PKEY_CTX_free(pkey_ctx);
2945                         if (ret)
2946                                 return ret;
2947                         else
2948                                 goto err;
2949                         }
2950                 else
2951                 {
2952                 al=SSL_AD_HANDSHAKE_FAILURE;
2953                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2954                                 SSL_R_UNKNOWN_CIPHER_TYPE);
2955                 goto f_err;
2956                 }
2957
2958         return(1);
2959 f_err:
2960         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2961 #if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA) || !defined(OPENSSL_NO_ECDH) || defined(OPENSSL_NO_SRP)
2962 err:
2963 #endif
2964 #ifndef OPENSSL_NO_ECDH
2965         EVP_PKEY_free(clnt_pub_pkey);
2966         EC_POINT_free(clnt_ecpoint);
2967         if (srvr_ecdh != NULL)
2968                 EC_KEY_free(srvr_ecdh);
2969         BN_CTX_free(bn_ctx);
2970 #endif
2971         return(-1);
2972         }
2973
2974 int ssl3_get_cert_verify(SSL *s)
2975         {
2976         EVP_PKEY *pkey=NULL;
2977         unsigned char *p;
2978         int al,ok,ret=0;
2979         long n;
2980         int type=0,i,j;
2981         X509 *peer;
2982         const EVP_MD *md = NULL;
2983         EVP_MD_CTX mctx;
2984         EVP_MD_CTX_init(&mctx);
2985
2986         n=s->method->ssl_get_message(s,
2987                 SSL3_ST_SR_CERT_VRFY_A,
2988                 SSL3_ST_SR_CERT_VRFY_B,
2989                 -1,
2990                 516, /* Enough for 4096 bit RSA key with TLS v1.2 */
2991                 &ok);
2992
2993         if (!ok) return((int)n);
2994
2995         if (s->session->peer != NULL)
2996                 {
2997                 peer=s->session->peer;
2998                 pkey=X509_get_pubkey(peer);
2999                 type=X509_certificate_type(peer,pkey);
3000                 }
3001         else
3002                 {
3003                 peer=NULL;
3004                 pkey=NULL;
3005                 }
3006
3007         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
3008                 {
3009                 s->s3->tmp.reuse_message=1;
3010                 if ((peer != NULL) && (type & EVP_PKT_SIGN))
3011                         {
3012                         al=SSL_AD_UNEXPECTED_MESSAGE;
3013                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
3014                         goto f_err;
3015                         }
3016                 ret=1;
3017                 goto end;
3018                 }
3019
3020         if (peer == NULL)
3021                 {
3022                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
3023                 al=SSL_AD_UNEXPECTED_MESSAGE;
3024                 goto f_err;
3025                 }
3026
3027         if (!(type & EVP_PKT_SIGN))
3028                 {
3029                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
3030                 al=SSL_AD_ILLEGAL_PARAMETER;
3031                 goto f_err;
3032                 }
3033
3034         if (s->s3->change_cipher_spec)
3035                 {
3036                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
3037                 al=SSL_AD_UNEXPECTED_MESSAGE;
3038                 goto f_err;
3039                 }
3040
3041         /* we now have a signature that we need to verify */
3042         p=(unsigned char *)s->init_msg;
3043         /* Check for broken implementations of GOST ciphersuites */
3044         /* If key is GOST and n is exactly 64, it is bare
3045          * signature without length field */
3046         if (n==64 && (pkey->type==NID_id_GostR3410_94 ||
3047                 pkey->type == NID_id_GostR3410_2001) )
3048                 {
3049                 i=64;
3050                 }
3051         else
3052                 {
3053                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
3054                         {
3055                         int sigalg = tls12_get_sigid(pkey);
3056                         /* Should never happen */
3057                         if (sigalg == -1)
3058                                 {
3059                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
3060                                 al=SSL_AD_INTERNAL_ERROR;
3061                                 goto f_err;
3062                                 }
3063                         /* Check key type is consistent with signature */
3064                         if (sigalg != (int)p[1])
3065                                 {
3066                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_TYPE);
3067                                 al=SSL_AD_DECODE_ERROR;
3068                                 goto f_err;
3069                                 }
3070                         md = tls12_get_hash(p[0]);
3071                         if (md == NULL)
3072                                 {
3073                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_UNKNOWN_DIGEST);
3074                                 al=SSL_AD_DECODE_ERROR;
3075                                 goto f_err;
3076                                 }
3077 #ifdef SSL_DEBUG
3078 fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
3079 #endif
3080                         p += 2;
3081                         n -= 2;
3082                         }
3083                 n2s(p,i);
3084                 n-=2;
3085                 if (i > n)
3086                         {
3087                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
3088                         al=SSL_AD_DECODE_ERROR;
3089                         goto f_err;
3090                         }
3091         }
3092         j=EVP_PKEY_size(pkey);
3093         if ((i > j) || (n > j) || (n <= 0))
3094                 {
3095                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
3096                 al=SSL_AD_DECODE_ERROR;
3097                 goto f_err;
3098                 }
3099
3100         if (TLS1_get_version(s) >= TLS1_2_VERSION)
3101                 {
3102                 long hdatalen = 0;
3103                 void *hdata;
3104                 hdatalen = BIO_get_mem_data(s->s3->handshake_buffer, &hdata);
3105                 if (hdatalen <= 0)
3106                         {
3107                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, ERR_R_INTERNAL_ERROR);
3108                         al=SSL_AD_INTERNAL_ERROR;
3109                         goto f_err;
3110                         }
3111 #ifdef SSL_DEBUG
3112                 fprintf(stderr, "Using TLS 1.2 with client verify alg %s\n",
3113                                                         EVP_MD_name(md));
3114 #endif
3115                 if (!EVP_VerifyInit_ex(&mctx, md, NULL)
3116                         || !EVP_VerifyUpdate(&mctx, hdata, hdatalen))
3117                         {
3118                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, ERR_R_EVP_LIB);
3119                         al=SSL_AD_INTERNAL_ERROR;
3120                         goto f_err;
3121                         }
3122
3123                 if (EVP_VerifyFinal(&mctx, p , i, pkey) <= 0)
3124                         {
3125                         al=SSL_AD_DECRYPT_ERROR;
3126                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_SIGNATURE);
3127                         goto f_err;
3128                         }
3129                 }
3130         else
3131 #ifndef OPENSSL_NO_RSA
3132         if (pkey->type == EVP_PKEY_RSA)
3133                 {
3134                 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
3135                         MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i,
3136                                                         pkey->pkey.rsa);
3137                 if (i < 0)
3138                         {
3139                         al=SSL_AD_DECRYPT_ERROR;
3140                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
3141                         goto f_err;
3142                         }
3143                 if (i == 0)
3144                         {
3145                         al=SSL_AD_DECRYPT_ERROR;
3146                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
3147                         goto f_err;
3148                         }
3149                 }
3150         else
3151 #endif
3152 #ifndef OPENSSL_NO_DSA
3153                 if (pkey->type == EVP_PKEY_DSA)
3154                 {
3155                 j=DSA_verify(pkey->save_type,
3156                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
3157                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
3158                 if (j <= 0)
3159                         {
3160                         /* bad signature */
3161                         al=SSL_AD_DECRYPT_ERROR;
3162                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
3163                         goto f_err;
3164                         }
3165                 }
3166         else
3167 #endif
3168 #ifndef OPENSSL_NO_ECDSA
3169                 if (pkey->type == EVP_PKEY_EC)
3170                 {
3171                 j=ECDSA_verify(pkey->save_type,
3172                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
3173                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.ec);
3174                 if (j <= 0)
3175                         {
3176                         /* bad signature */
3177                         al=SSL_AD_DECRYPT_ERROR;
3178                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
3179                             SSL_R_BAD_ECDSA_SIGNATURE);
3180                         goto f_err;
3181                         }
3182                 }
3183         else
3184 #endif
3185         if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001)
3186                 {   unsigned char signature[64];
3187                         int idx;
3188                         EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new(pkey,NULL);
3189                         EVP_PKEY_verify_init(pctx);
3190                         if (i!=64) {
3191                                 fprintf(stderr,"GOST signature length is %d",i);
3192                         }
3193                         for (idx=0;idx<64;idx++) {
3194                                 signature[63-idx]=p[idx];
3195                         }
3196                         j=EVP_PKEY_verify(pctx,signature,64,s->s3->tmp.cert_verify_md,32);
3197                         EVP_PKEY_CTX_free(pctx);
3198                         if (j<=0)
3199                                 {
3200                                 al=SSL_AD_DECRYPT_ERROR;
3201                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
3202                                         SSL_R_BAD_ECDSA_SIGNATURE);
3203                                 goto f_err;
3204                                 }
3205                 }
3206         else
3207                 {
3208                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
3209                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
3210                 goto f_err;
3211                 }
3212
3213
3214         ret=1;
3215         if (0)
3216                 {
3217 f_err:
3218                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
3219                 }
3220 end:
3221         if (s->s3->handshake_buffer)
3222                 {
3223                 BIO_free(s->s3->handshake_buffer);
3224                 s->s3->handshake_buffer = NULL;
3225                 s->s3->flags &= ~TLS1_FLAGS_KEEP_HANDSHAKE;
3226                 }
3227         EVP_MD_CTX_cleanup(&mctx);
3228         EVP_PKEY_free(pkey);
3229         return(ret);
3230         }
3231
3232 int ssl3_get_client_certificate(SSL *s)
3233         {
3234         int i,ok,al,ret= -1;
3235         X509 *x=NULL;
3236         unsigned long l,nc,llen,n;
3237         const unsigned char *p,*q;
3238         unsigned char *d;
3239         STACK_OF(X509) *sk=NULL;
3240
3241         n=s->method->ssl_get_message(s,
3242                 SSL3_ST_SR_CERT_A,
3243                 SSL3_ST_SR_CERT_B,
3244                 -1,
3245                 s->max_cert_list,
3246                 &ok);
3247
3248         if (!ok) return((int)n);
3249
3250         if      (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
3251                 {
3252                 if (    (s->verify_mode & SSL_VERIFY_PEER) &&
3253                         (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
3254                         {
3255                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
3256                         al=SSL_AD_HANDSHAKE_FAILURE;
3257                         goto f_err;
3258                         }
3259                 /* If tls asked for a client cert, the client must return a 0 list */
3260                 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
3261                         {
3262                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
3263                         al=SSL_AD_UNEXPECTED_MESSAGE;
3264                         goto f_err;
3265                         }
3266                 s->s3->tmp.reuse_message=1;
3267                 return(1);
3268                 }
3269
3270         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
3271                 {
3272                 al=SSL_AD_UNEXPECTED_MESSAGE;
3273                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
3274                 goto f_err;
3275                 }
3276         p=d=(unsigned char *)s->init_msg;
3277
3278         if ((sk=sk_X509_new_null()) == NULL)
3279                 {
3280                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
3281                 goto err;
3282                 }
3283
3284         n2l3(p,llen);
3285         if (llen+3 != n)
3286                 {
3287                 al=SSL_AD_DECODE_ERROR;
3288                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
3289                 goto f_err;
3290                 }
3291         for (nc=0; nc<llen; )
3292                 {
3293                 n2l3(p,l);
3294                 if ((l+nc+3) > llen)
3295                         {
3296                         al=SSL_AD_DECODE_ERROR;
3297                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
3298                         goto f_err;
3299                         }
3300
3301                 q=p;
3302                 x=d2i_X509(NULL,&p,l);
3303                 if (x == NULL)
3304                         {
3305                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
3306                         goto err;
3307                         }
3308                 if (p != (q+l))
3309                         {
3310                         al=SSL_AD_DECODE_ERROR;
3311                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
3312                         goto f_err;
3313                         }
3314                 if (!sk_X509_push(sk,x))
3315                         {
3316                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
3317                         goto err;
3318                         }
3319                 x=NULL;
3320                 nc+=l+3;
3321                 }
3322
3323         if (sk_X509_num(sk) <= 0)
3324                 {
3325                 /* TLS does not mind 0 certs returned */
3326                 if (s->version == SSL3_VERSION)
3327                         {
3328                         al=SSL_AD_HANDSHAKE_FAILURE;
3329                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
3330                         goto f_err;
3331                         }
3332                 /* Fail for TLS only if we required a certificate */
3333                 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
3334                          (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
3335                         {
3336                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
3337                         al=SSL_AD_HANDSHAKE_FAILURE;
3338                         goto f_err;
3339                         }
3340                 /* No client certificate so digest cached records */
3341                 if (s->s3->handshake_buffer && !ssl3_digest_cached_records(s))
3342                         {
3343                         al=SSL_AD_INTERNAL_ERROR;
3344                         goto f_err;
3345                         }
3346                 }
3347         else
3348                 {
3349                 i=ssl_verify_cert_chain(s,sk);
3350                 if (i <= 0)
3351                         {
3352                         al=ssl_verify_alarm_type(s->verify_result);
3353                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
3354                         goto f_err;
3355                         }
3356                 }
3357
3358         if (s->session->peer != NULL) /* This should not be needed */
3359                 X509_free(s->session->peer);
3360         s->session->peer=sk_X509_shift(sk);
3361         s->session->verify_result = s->verify_result;
3362
3363         /* With the current implementation, sess_cert will always be NULL
3364          * when we arrive here. */
3365         if (s->session->sess_cert == NULL)
3366                 {
3367                 s->session->sess_cert = ssl_sess_cert_new();
3368                 if (s->session->sess_cert == NULL)
3369                         {
3370                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
3371                         goto err;
3372                         }
3373                 }
3374         if (s->session->sess_cert->cert_chain != NULL)
3375                 sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free);
3376         s->session->sess_cert->cert_chain=sk;
3377         /* Inconsistency alert: cert_chain does *not* include the
3378          * peer's own certificate, while we do include it in s3_clnt.c */
3379
3380         sk=NULL;
3381
3382         ret=1;
3383         if (0)
3384                 {
3385 f_err:
3386                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
3387                 }
3388 err:
3389         if (x != NULL) X509_free(x);
3390         if (sk != NULL) sk_X509_pop_free(sk,X509_free);
3391         return(ret);
3392         }
3393
3394 int ssl3_send_server_certificate(SSL *s)
3395         {
3396         unsigned long l;
3397         CERT_PKEY *cpk;
3398
3399         if (s->state == SSL3_ST_SW_CERT_A)
3400                 {
3401                 cpk=ssl_get_server_send_pkey(s);
3402                 if (cpk == NULL)
3403                         {
3404                         /* VRS: allow null cert if auth == KRB5 */
3405                         if ((s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5) ||
3406                             (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5))
3407                                 {
3408                                 SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
3409                                 return(0);
3410                                 }
3411                         }
3412
3413                 l=ssl3_output_cert_chain(s,cpk);
3414                 s->state=SSL3_ST_SW_CERT_B;
3415                 s->init_num=(int)l;
3416                 s->init_off=0;
3417                 }
3418
3419         /* SSL3_ST_SW_CERT_B */
3420         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3421         }
3422
3423 #ifndef OPENSSL_NO_TLSEXT
3424 /* send a new session ticket (not necessarily for a new session) */
3425 int ssl3_send_newsession_ticket(SSL *s)
3426         {
3427         if (s->state == SSL3_ST_SW_SESSION_TICKET_A)
3428                 {
3429                 unsigned char *p, *senc, *macstart;
3430                 const unsigned char *const_p;
3431                 int len, slen_full, slen;
3432                 SSL_SESSION *sess;
3433                 unsigned int hlen;
3434                 EVP_CIPHER_CTX ctx;
3435                 HMAC_CTX hctx;
3436                 SSL_CTX *tctx = s->initial_ctx;
3437                 unsigned char iv[EVP_MAX_IV_LENGTH];
3438                 unsigned char key_name[16];
3439
3440                 /* get session encoding length */
3441                 slen_full = i2d_SSL_SESSION(s->session, NULL);
3442                 /* Some length values are 16 bits, so forget it if session is
3443                  * too long
3444                  */
3445                 if (slen_full > 0xFF00)
3446                         return -1;
3447                 senc = OPENSSL_malloc(slen_full);
3448                 if (!senc)
3449                         return -1;
3450                 p = senc;
3451                 i2d_SSL_SESSION(s->session, &p);
3452
3453                 /* create a fresh copy (not shared with other threads) to clean up */
3454                 const_p = senc;
3455                 sess = d2i_SSL_SESSION(NULL, &const_p, slen_full);
3456                 if (sess == NULL)
3457                         {
3458                         OPENSSL_free(senc);
3459                         return -1;
3460                         }
3461                 sess->session_id_length = 0; /* ID is irrelevant for the ticket */
3462
3463                 slen = i2d_SSL_SESSION(sess, NULL);
3464                 if (slen > slen_full) /* shouldn't ever happen */
3465                         {
3466                         OPENSSL_free(senc);
3467                         return -1;
3468                         }
3469                 p = senc;
3470                 i2d_SSL_SESSION(sess, &p);
3471                 SSL_SESSION_free(sess);
3472
3473                 /* Grow buffer if need be: the length calculation is as
3474                  * follows 1 (size of message name) + 3 (message length
3475                  * bytes) + 4 (ticket lifetime hint) + 2 (ticket length) +
3476                  * 16 (key name) + max_iv_len (iv length) +
3477                  * session_length + max_enc_block_size (max encrypted session
3478                  * length) + max_md_size (HMAC).
3479                  */
3480                 if (!BUF_MEM_grow(s->init_buf,
3481                         26 + EVP_MAX_IV_LENGTH + EVP_MAX_BLOCK_LENGTH +
3482                         EVP_MAX_MD_SIZE + slen))
3483                         return -1;
3484
3485                 p=(unsigned char *)s->init_buf->data;
3486                 /* do the header */
3487                 *(p++)=SSL3_MT_NEWSESSION_TICKET;
3488                 /* Skip message length for now */
3489                 p += 3;
3490                 EVP_CIPHER_CTX_init(&ctx);
3491                 HMAC_CTX_init(&hctx);
3492                 /* Initialize HMAC and cipher contexts. If callback present
3493                  * it does all the work otherwise use generated values
3494                  * from parent ctx.
3495                  */
3496                 if (tctx->tlsext_ticket_key_cb)
3497                         {
3498                         if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx,
3499                                                          &hctx, 1) < 0)
3500                                 {
3501                                 OPENSSL_free(senc);
3502                                 return -1;
3503                                 }
3504                         }
3505                 else
3506                         {
3507                         RAND_pseudo_bytes(iv, 16);
3508                         EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
3509                                         tctx->tlsext_tick_aes_key, iv);
3510                         HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
3511                                         tlsext_tick_md(), NULL);
3512                         memcpy(key_name, tctx->tlsext_tick_key_name, 16);
3513                         }
3514
3515                 /* Ticket lifetime hint (advisory only):
3516                  * We leave this unspecified for resumed session (for simplicity),
3517                  * and guess that tickets for new sessions will live as long
3518                  * as their sessions. */
3519                 l2n(s->hit ? 0 : s->session->timeout, p);
3520
3521                 /* Skip ticket length for now */
3522                 p += 2;
3523                 /* Output key name */
3524                 macstart = p;
3525                 memcpy(p, key_name, 16);
3526                 p += 16;
3527                 /* output IV */
3528                 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
3529                 p += EVP_CIPHER_CTX_iv_length(&ctx);
3530                 /* Encrypt session data */
3531                 EVP_EncryptUpdate(&ctx, p, &len, senc, slen);
3532                 p += len;
3533                 EVP_EncryptFinal(&ctx, p, &len);
3534                 p += len;
3535                 EVP_CIPHER_CTX_cleanup(&ctx);
3536
3537                 HMAC_Update(&hctx, macstart, p - macstart);
3538                 HMAC_Final(&hctx, p, &hlen);
3539                 HMAC_CTX_cleanup(&hctx);
3540
3541                 p += hlen;
3542                 /* Now write out lengths: p points to end of data written */
3543                 /* Total length */
3544                 len = p - (unsigned char *)s->init_buf->data;
3545                 p=(unsigned char *)s->init_buf->data + 1;
3546                 l2n3(len - 4, p); /* Message length */
3547                 p += 4;
3548                 s2n(len - 10, p);  /* Ticket length */
3549
3550                 /* number of bytes to write */
3551                 s->init_num= len;
3552                 s->state=SSL3_ST_SW_SESSION_TICKET_B;
3553                 s->init_off=0;
3554                 OPENSSL_free(senc);
3555                 }
3556
3557         /* SSL3_ST_SW_SESSION_TICKET_B */
3558         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3559         }
3560
3561 int ssl3_send_cert_status(SSL *s)
3562         {
3563         if (s->state == SSL3_ST_SW_CERT_STATUS_A)
3564                 {
3565                 unsigned char *p;
3566                 /* Grow buffer if need be: the length calculation is as
3567                  * follows 1 (message type) + 3 (message length) +
3568                  * 1 (ocsp response type) + 3 (ocsp response length)
3569                  * + (ocsp response)
3570                  */
3571                 if (!BUF_MEM_grow(s->init_buf, 8 + s->tlsext_ocsp_resplen))
3572                         return -1;
3573
3574                 p=(unsigned char *)s->init_buf->data;
3575
3576                 /* do the header */
3577                 *(p++)=SSL3_MT_CERTIFICATE_STATUS;
3578                 /* message length */
3579                 l2n3(s->tlsext_ocsp_resplen + 4, p);
3580                 /* status type */
3581                 *(p++)= s->tlsext_status_type;
3582                 /* length of OCSP response */
3583                 l2n3(s->tlsext_ocsp_resplen, p);
3584                 /* actual response */
3585                 memcpy(p, s->tlsext_ocsp_resp, s->tlsext_ocsp_resplen);
3586                 /* number of bytes to write */
3587                 s->init_num = 8 + s->tlsext_ocsp_resplen;
3588                 s->state=SSL3_ST_SW_CERT_STATUS_B;
3589                 s->init_off = 0;
3590                 }
3591
3592         /* SSL3_ST_SW_CERT_STATUS_B */
3593         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3594         }
3595
3596 # ifndef OPENSSL_NO_NEXTPROTONEG
3597 /* ssl3_get_next_proto reads a Next Protocol Negotiation handshake message. It
3598  * sets the next_proto member in s if found */
3599 int ssl3_get_next_proto(SSL *s)
3600         {
3601         int ok;
3602         int proto_len, padding_len;
3603         long n;
3604         const unsigned char *p;
3605
3606         /* Clients cannot send a NextProtocol message if we didn't see the
3607          * extension in their ClientHello */
3608         if (!s->s3->next_proto_neg_seen)
3609                 {
3610                 SSLerr(SSL_F_SSL3_GET_NEXT_PROTO,SSL_R_GOT_NEXT_PROTO_WITHOUT_EXTENSION);
3611                 return -1;
3612                 }
3613
3614         n=s->method->ssl_get_message(s,
3615                 SSL3_ST_SR_NEXT_PROTO_A,
3616                 SSL3_ST_SR_NEXT_PROTO_B,
3617                 SSL3_MT_NEXT_PROTO,
3618                 514,  /* See the payload format below */
3619                 &ok);
3620
3621         if (!ok)
3622                 return((int)n);
3623
3624         /* s->state doesn't reflect whether ChangeCipherSpec has been received
3625          * in this handshake, but s->s3->change_cipher_spec does (will be reset
3626          * by ssl3_get_finished). */
3627         if (!s->s3->change_cipher_spec)
3628                 {
3629                 SSLerr(SSL_F_SSL3_GET_NEXT_PROTO,SSL_R_GOT_NEXT_PROTO_BEFORE_A_CCS);
3630                 return -1;
3631                 }
3632
3633         if (n < 2)
3634                 return 0;  /* The body must be > 1 bytes long */
3635
3636         p=(unsigned char *)s->init_msg;
3637
3638         /* The payload looks like:
3639          *   uint8 proto_len;
3640          *   uint8 proto[proto_len];
3641          *   uint8 padding_len;
3642          *   uint8 padding[padding_len];
3643          */
3644         proto_len = p[0];
3645         if (proto_len + 2 > s->init_num)
3646                 return 0;
3647         padding_len = p[proto_len + 1];
3648         if (proto_len + padding_len + 2 != s->init_num)
3649                 return 0;
3650
3651         s->next_proto_negotiated = OPENSSL_malloc(proto_len);
3652         if (!s->next_proto_negotiated)
3653                 {
3654                 SSLerr(SSL_F_SSL3_GET_NEXT_PROTO,ERR_R_MALLOC_FAILURE);
3655                 return 0;
3656                 }
3657         memcpy(s->next_proto_negotiated, p + 1, proto_len);
3658         s->next_proto_negotiated_len = proto_len;
3659
3660         return 1;
3661         }
3662 # endif
3663
3664 int tls1_send_server_supplemental_data(SSL *s)
3665         {
3666         size_t length = 0;
3667         const unsigned char *authz, *orig_authz;
3668         unsigned char *p;
3669         size_t authz_length, i;
3670
3671         if (s->state != SSL3_ST_SW_SUPPLEMENTAL_DATA_A)
3672                 return ssl3_do_write(s, SSL3_RT_HANDSHAKE);
3673
3674         orig_authz = authz = ssl_get_authz_data(s, &authz_length);
3675         if (authz == NULL)
3676                 {
3677                 /* This should never occur. */
3678                 return 0;
3679                 }
3680
3681         /* First we walk over the authz data to see how long the handshake
3682          * message will be. */
3683         for (i = 0; i < authz_length; i++)
3684                 {
3685                 unsigned short len;
3686                 unsigned char type;
3687
3688                 type = *(authz++);
3689                 n2s(authz, len);
3690                 /* n2s increments authz by 2*/
3691                 i += 2;
3692
3693                 if (memchr(s->s3->tlsext_authz_client_types,
3694                            type,
3695                            s->s3->tlsext_authz_client_types_len) != NULL)
3696                         length += 1 /* authz type */ + 2 /* length */ + len;
3697
3698                 authz += len;
3699                 i += len;
3700                 }
3701
3702         length += 1 /* handshake type */ +
3703                   3 /* handshake length */ +
3704                   3 /* supplemental data length */ +
3705                   2 /* supplemental entry type */ +
3706                   2 /* supplemental entry length */;
3707
3708         if (!BUF_MEM_grow_clean(s->init_buf, length))
3709                 {
3710                 SSLerr(SSL_F_TLS1_SEND_SERVER_SUPPLEMENTAL_DATA,ERR_R_BUF_LIB);
3711                 return 0;
3712                 }
3713
3714         p = (unsigned char *)s->init_buf->data;
3715         *(p++) = SSL3_MT_SUPPLEMENTAL_DATA;
3716         /* Handshake length */
3717         l2n3(length - 4, p);
3718         /* Length of supplemental data */
3719         l2n3(length - 7, p);
3720         /* Supplemental data type */
3721         s2n(TLSEXT_SUPPLEMENTALDATATYPE_authz_data, p);
3722         /* Its length */
3723         s2n(length - 11, p);
3724
3725         authz = orig_authz;
3726
3727         /* Walk over the authz again and append the selected elements. */
3728         for (i = 0; i < authz_length; i++)
3729                 {
3730                 unsigned short len;
3731                 unsigned char type;
3732
3733                 type = *(authz++);
3734                 n2s(authz, len);
3735                 /* n2s increments authz by 2 */
3736                 i += 2;
3737
3738                 if (memchr(s->s3->tlsext_authz_client_types,
3739                            type,
3740                            s->s3->tlsext_authz_client_types_len) != NULL)
3741                         {
3742                         *(p++) = type;
3743                         s2n(len, p);
3744                         memcpy(p, authz, len);
3745                         p += len;
3746                         }
3747
3748                 authz += len;
3749                 i += len;
3750                 }
3751
3752         s->state = SSL3_ST_SW_SUPPLEMENTAL_DATA_B;
3753         s->init_num = length;
3754         s->init_off = 0;
3755
3756         return ssl3_do_write(s, SSL3_RT_HANDSHAKE);
3757         }
3758 #endif