ssl/t1_lib.c

   1 /* ssl/t1_lib.c */
   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 #include <stdio.h>
 113 #include <openssl/objects.h>
 114 #include <openssl/evp.h>
 115 #include <openssl/hmac.h>
 116 #include "ssl_locl.h"
 117
 118 const char tls1_version_str[]="TLSv1" OPENSSL_VERSION_PTEXT;
 119
 120 static int tls_decrypt_ticket(SSL *s, const unsigned char *tick, int ticklen,
 121                                 const unsigned char *sess_id, int sesslen,
 122                                 SSL_SESSION **psess);
 123
 124 SSL3_ENC_METHOD TLSv1_enc_data={
 125         tls1_enc,
 126         tls1_mac,
 127         tls1_setup_key_block,
 128         tls1_generate_master_secret,
 129         tls1_change_cipher_state,
 130         tls1_final_finish_mac,
 131         TLS1_FINISH_MAC_LENGTH,
 132         tls1_cert_verify_mac,
 133         TLS_MD_CLIENT_FINISH_CONST,TLS_MD_CLIENT_FINISH_CONST_SIZE,
 134         TLS_MD_SERVER_FINISH_CONST,TLS_MD_SERVER_FINISH_CONST_SIZE,
 135         tls1_alert_code,
 136         };
 137
 138 long tls1_default_timeout(void)
 139         {
 140         /* 2 hours, the 24 hours mentioned in the TLSv1 spec
 141          * is way too long for http, the cache would over fill */
 142         return(60*60*2);
 143         }
 144
 145 int tls1_new(SSL *s)
 146         {
 147         if (!ssl3_new(s)) return(0);
 148         s->method->ssl_clear(s);
 149         return(1);
 150         }
 151
 152 void tls1_free(SSL *s)
 153         {
 154         ssl3_free(s);
 155         }
 156
 157 void tls1_clear(SSL *s)
 158         {
 159         ssl3_clear(s);
 160         s->version=TLS1_VERSION;
 161         }
 162
 163
 164 #ifndef OPENSSL_NO_TLSEXT
 165 unsigned char *ssl_add_clienthello_tlsext(SSL *s, unsigned char *p, unsigned char *limit)
 166         {
 167         int extdatalen=0;
 168         unsigned char *ret = p;
 169
 170         ret+=2;
 171
 172         if (ret>=limit) return NULL; /* this really never occurs, but ... */
 173
 174         if (s->tlsext_hostname != NULL)
 175                 {
 176                 /* Add TLS extension servername to the Client Hello message */
 177                 unsigned long size_str;
 178                 long lenmax;
 179
 180                 /* check for enough space.
 181                    4 for the servername type and entension length
 182                    2 for servernamelist length
 183                    1 for the hostname type
 184                    2 for hostname length
 185                    + hostname length
 186                 */
 187
 188                 if ((lenmax = limit - p - 9) < 0
 189                 || (size_str = strlen(s->tlsext_hostname)) > (unsigned long)lenmax)
 190                         return NULL;
 191
 192                 /* extension type and length */
 193                 s2n(TLSEXT_TYPE_server_name,ret);
 194                 s2n(size_str+5,ret);
 195
 196                 /* length of servername list */
 197                 s2n(size_str+3,ret);
 198
 199                 /* hostname type, length and hostname */
 200                 *(ret++) = (unsigned char) TLSEXT_NAMETYPE_host_name;
 201                 s2n(size_str,ret);
 202                 memcpy(ret, s->tlsext_hostname, size_str);
 203                 ret+=size_str;
 204
 205                 }
 206 #ifndef OPENSSL_NO_EC
 207         if (s->tlsext_ecpointformatlist != NULL)
 208                 {
 209                 /* Add TLS extension ECPointFormats to the ClientHello message */
 210                 long lenmax;
 211
 212                 if ((lenmax = limit - p - 5) < 0) return NULL;
 213                 if (s->tlsext_ecpointformatlist_length > (unsigned long)lenmax) return NULL;
 214                 if (s->tlsext_ecpointformatlist_length > 255)
 215                         {
 216                         SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
 217                         return NULL;
 218                         }
 219
 220                 s2n(TLSEXT_TYPE_ec_point_formats,ret);
 221                 s2n(s->tlsext_ecpointformatlist_length + 1,ret);
 222                 *(ret++) = (unsigned char) s->tlsext_ecpointformatlist_length;
 223                 memcpy(ret, s->tlsext_ecpointformatlist, s->tlsext_ecpointformatlist_length);
 224                 ret+=s->tlsext_ecpointformatlist_length;
 225                 }
 226         if (s->tlsext_ellipticcurvelist != NULL)
 227                 {
 228                 /* Add TLS extension EllipticCurves to the ClientHello message */
 229                 long lenmax;
 230
 231                 if ((lenmax = limit - p - 6) < 0) return NULL;
 232                 if (s->tlsext_ellipticcurvelist_length > (unsigned long)lenmax) return NULL;
 233                 if (s->tlsext_ellipticcurvelist_length > 65532)
 234                         {
 235                         SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
 236                         return NULL;
 237                         }
 238
 239                 s2n(TLSEXT_TYPE_elliptic_curves,ret);
 240                 s2n(s->tlsext_ellipticcurvelist_length + 2, ret);
 241
 242                 /* NB: draft-ietf-tls-ecc-12.txt uses a one-byte prefix for
 243                  * elliptic_curve_list, but the examples use two bytes.
 244                  * http://www1.ietf.org/mail-archive/web/tls/current/msg00538.html
 245                  * resolves this to two bytes.
 246                  */
 247                 s2n(s->tlsext_ellipticcurvelist_length, ret);
 248                 memcpy(ret, s->tlsext_ellipticcurvelist, s->tlsext_ellipticcurvelist_length);
 249                 ret+=s->tlsext_ellipticcurvelist_length;
 250                 }
 251 #endif /* OPENSSL_NO_EC */
 252
 253         if (!(SSL_get_options(s) & SSL_OP_NO_TICKET))
 254                 {
 255                 int ticklen;
 256                 if (s->session && s->session->tlsext_tick)
 257                         ticklen = s->session->tlsext_ticklen;
 258                 else
 259                         ticklen = 0;
 260                 /* Check for enough room 2 for extension type, 2 for len
 261                  * rest for ticket
 262                  */
 263                 if (limit - p - 4 - ticklen < 0)
 264                         return NULL;
 265                 s2n(TLSEXT_TYPE_session_ticket,ret);
 266                 s2n(ticklen,ret);
 267                 if (ticklen)
 268                         {
 269                         memcpy(ret, s->session->tlsext_tick, ticklen);
 270                         ret += ticklen;
 271                         }
 272                 }
 273
 274         if ((extdatalen = ret-p-2)== 0)
 275                 return p;
 276
 277         s2n(extdatalen,p);
 278         return ret;
 279         }
 280
 281 unsigned char *ssl_add_serverhello_tlsext(SSL *s, unsigned char *p, unsigned char *limit)
 282         {
 283         int extdatalen=0;
 284         unsigned char *ret = p;
 285
 286         ret+=2;
 287         if (ret>=limit) return NULL; /* this really never occurs, but ... */
 288
 289         if (!s->hit && s->servername_done == 1 && s->session->tlsext_hostname != NULL)
 290                 {
 291                 if (limit - p - 4 < 0) return NULL;
 292
 293                 s2n(TLSEXT_TYPE_server_name,ret);
 294                 s2n(0,ret);
 295                 }
 296 #ifndef OPENSSL_NO_EC
 297         if (s->tlsext_ecpointformatlist != NULL)
 298                 {
 299                 /* Add TLS extension ECPointFormats to the ServerHello message */
 300                 long lenmax;
 301
 302                 if ((lenmax = limit - p - 5) < 0) return NULL;
 303                 if (s->tlsext_ecpointformatlist_length > (unsigned long)lenmax) return NULL;
 304                 if (s->tlsext_ecpointformatlist_length > 255)
 305                         {
 306                         SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
 307                         return NULL;
 308                         }
 309
 310                 s2n(TLSEXT_TYPE_ec_point_formats,ret);
 311                 s2n(s->tlsext_ecpointformatlist_length + 1,ret);
 312                 *(ret++) = (unsigned char) s->tlsext_ecpointformatlist_length;
 313                 memcpy(ret, s->tlsext_ecpointformatlist, s->tlsext_ecpointformatlist_length);
 314                 ret+=s->tlsext_ecpointformatlist_length;
 315
 316                 }
 317         /* Currently the server should not respond with a SupportedCurves extension */
 318 #endif /* OPENSSL_NO_EC */
 319
 320         if (s->tlsext_ticket_expected
 321                 && !(SSL_get_options(s) & SSL_OP_NO_TICKET))
 322                 {
 323                 if (limit - p - 4 < 0) return NULL;
 324                 s2n(TLSEXT_TYPE_session_ticket,ret);
 325                 s2n(0,ret);
 326                 }
 327
 328         if ((extdatalen = ret-p-2)== 0)
 329                 return p;
 330
 331         s2n(extdatalen,p);
 332         return ret;
 333         }
 334
 335 int ssl_parse_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al)
 336         {
 337         unsigned short type;
 338         unsigned short size;
 339         unsigned short len;
 340         unsigned char *data = *p;
 341         s->servername_done = 0;
 342
 343         if (data >= (d+n-2))
 344                 return 1;
 345         n2s(data,len);
 346
 347         if (data > (d+n-len))
 348                 return 1;
 349
 350         while (data <= (d+n-4))
 351                 {
 352                 n2s(data,type);
 353                 n2s(data,size);
 354
 355                 if (data+size > (d+n))
 356                         return 1;
 357
 358                 if (s->tlsext_debug_cb)
 359                         s->tlsext_debug_cb(s, 0, type, data, size,
 360                                                 s->tlsext_debug_arg);
 361 /* The servername extension is treated as follows:
 362
 363    - Only the hostname type is supported with a maximum length of 255.
 364    - The servername is rejected if too long or if it contains zeros,
 365      in which case an fatal alert is generated.
 366    - The servername field is maintained together with the session cache.
 367    - When a session is resumed, the servername call back invoked in order
 368      to allow the application to position itself to the right context.
 369    - The servername is acknowledged if it is new for a session or when
 370      it is identical to a previously used for the same session.
 371      Applications can control the behaviour.  They can at any time
 372      set a 'desirable' servername for a new SSL object. This can be the
 373      case for example with HTTPS when a Host: header field is received and
 374      a renegotiation is requested. In this case, a possible servername
 375      presented in the new client hello is only acknowledged if it matches
 376      the value of the Host: field.
 377    - Applications must  use SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
 378      if they provide for changing an explicit servername context for the session,
 379      i.e. when the session has been established with a servername extension.
 380    - On session reconnect, the servername extension may be absent.
 381
 382 */
 383
 384                 if (type == TLSEXT_TYPE_server_name)
 385                         {
 386                         unsigned char *sdata;
 387                         int servname_type;
 388                         int dsize;
 389
 390                         if (size < 2)
 391                                 {
 392                                 *al = SSL_AD_DECODE_ERROR;
 393                                 return 0;
 394                                 }
 395                         n2s(data,dsize);
 396                         size -= 2;
 397                         if (dsize > size  )
 398                                 {
 399                                 *al = SSL_AD_DECODE_ERROR;
 400                                 return 0;
 401                                 }
 402
 403                         sdata = data;
 404                         while (dsize > 3)
 405                                 {
 406                                 servname_type = *(sdata++);
 407                                 n2s(sdata,len);
 408                                 dsize -= 3;
 409
 410                                 if (len > dsize)
 411                                         {
 412                                         *al = SSL_AD_DECODE_ERROR;
 413                                         return 0;
 414                                         }
 415                                 if (s->servername_done == 0)
 416                                 switch (servname_type)
 417                                         {
 418                                 case TLSEXT_NAMETYPE_host_name:
 419                                         if (s->session->tlsext_hostname == NULL)
 420                                                 {
 421                                                 if (len > TLSEXT_MAXLEN_host_name ||
 422                                                         ((s->session->tlsext_hostname = OPENSSL_malloc(len+1)) == NULL))
 423                                                         {
 424                                                         *al = TLS1_AD_UNRECOGNIZED_NAME;
 425                                                         return 0;
 426                                                         }
 427                                                 memcpy(s->session->tlsext_hostname, sdata, len);
 428                                                 s->session->tlsext_hostname[len]='\0';
 429                                                 if (strlen(s->session->tlsext_hostname) != len) {
 430                                                         OPENSSL_free(s->session->tlsext_hostname);
 431                                                         *al = TLS1_AD_UNRECOGNIZED_NAME;
 432                                                         return 0;
 433                                                 }
 434                                                 s->servername_done = 1;
 435
 436                                                 }
 437                                         else
 438                                                 s->servername_done = strlen(s->session->tlsext_hostname) == len
 439                                                         && strncmp(s->session->tlsext_hostname, (char *)sdata, len) == 0;
 440
 441                                         break;
 442
 443                                 default:
 444                                         break;
 445                                         }
 446
 447                                 dsize -= len;
 448                                 }
 449                         if (dsize != 0)
 450                                 {
 451                                 *al = SSL_AD_DECODE_ERROR;
 452                                 return 0;
 453                                 }
 454
 455                         }
 456
 457 #ifndef OPENSSL_NO_EC
 458                 else if (type == TLSEXT_TYPE_ec_point_formats)
 459                         {
 460                         unsigned char *sdata = data;
 461                         int ecpointformatlist_length = *(sdata++);
 462
 463                         if (ecpointformatlist_length != size - 1)
 464                                 {
 465                                 *al = TLS1_AD_DECODE_ERROR;
 466                                 return 0;
 467                                 }
 468                         s->session->tlsext_ecpointformatlist_length = 0;
 469                         if (s->session->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->session->tlsext_ecpointformatlist);
 470                         if ((s->session->tlsext_ecpointformatlist = OPENSSL_malloc(ecpointformatlist_length)) == NULL)
 471                                 {
 472                                 *al = TLS1_AD_INTERNAL_ERROR;
 473                                 return 0;
 474                                 }
 475                         s->session->tlsext_ecpointformatlist_length = ecpointformatlist_length;
 476                         memcpy(s->session->tlsext_ecpointformatlist, sdata, ecpointformatlist_length);
 477 #if 0
 478                         fprintf(stderr,"ssl_parse_clienthello_tlsext s->session->tlsext_ecpointformatlist (length=%i) ", s->session->tlsext_ecpointformatlist_length);
 479                         sdata = s->session->tlsext_ecpointformatlist;
 480                         for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
 481                                 fprintf(stderr,"%i ",*(sdata++));
 482                         fprintf(stderr,"\n");
 483 #endif
 484                         }
 485                 else if (type == TLSEXT_TYPE_elliptic_curves)
 486                         {
 487                         unsigned char *sdata = data;
 488                         int ellipticcurvelist_length = (*(sdata++) << 8);
 489                         ellipticcurvelist_length += (*(sdata++));
 490
 491                         if (ellipticcurvelist_length != size - 2)
 492                                 {
 493                                 *al = TLS1_AD_DECODE_ERROR;
 494                                 return 0;
 495                                 }
 496                         s->session->tlsext_ellipticcurvelist_length = 0;
 497                         if (s->session->tlsext_ellipticcurvelist != NULL) OPENSSL_free(s->session->tlsext_ellipticcurvelist);
 498                         if ((s->session->tlsext_ellipticcurvelist = OPENSSL_malloc(ellipticcurvelist_length)) == NULL)
 499                                 {
 500                                 *al = TLS1_AD_INTERNAL_ERROR;
 501                                 return 0;
 502                                 }
 503                         s->session->tlsext_ellipticcurvelist_length = ellipticcurvelist_length;
 504                         memcpy(s->session->tlsext_ellipticcurvelist, sdata, ellipticcurvelist_length);
 505 #if 0
 506                         fprintf(stderr,"ssl_parse_clienthello_tlsext s->session->tlsext_ellipticcurvelist (length=%i) ", s->session->tlsext_ellipticcurvelist_length);
 507                         sdata = s->session->tlsext_ellipticcurvelist;
 508                         for (i = 0; i < s->session->tlsext_ellipticcurvelist_length; i++)
 509                                 fprintf(stderr,"%i ",*(sdata++));
 510                         fprintf(stderr,"\n");
 511 #endif
 512                         }
 513 #endif /* OPENSSL_NO_EC */
 514                 /* session ticket processed earlier */
 515                 data+=size;
 516                 }
 517
 518         *p = data;
 519         return 1;
 520         }
 521
 522 int ssl_parse_serverhello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al)
 523         {
 524         unsigned short type;
 525         unsigned short size;
 526         unsigned short len;
 527         unsigned char *data = *p;
 528
 529         int tlsext_servername = 0;
 530
 531         if (data >= (d+n-2))
 532                 return 1;
 533
 534         n2s(data,len);
 535
 536         while(data <= (d+n-4))
 537                 {
 538                 n2s(data,type);
 539                 n2s(data,size);
 540
 541                 if (data+size > (d+n))
 542                         return 1;
 543
 544                 if (s->tlsext_debug_cb)
 545                         s->tlsext_debug_cb(s, 1, type, data, size,
 546                                                 s->tlsext_debug_arg);
 547
 548                 if (type == TLSEXT_TYPE_server_name)
 549                         {
 550                         if (s->tlsext_hostname == NULL || size > 0)
 551                                 {
 552                                 *al = TLS1_AD_UNRECOGNIZED_NAME;
 553                                 return 0;
 554                                 }
 555                         tlsext_servername = 1;
 556                         }
 557
 558 #ifndef OPENSSL_NO_EC
 559                 else if (type == TLSEXT_TYPE_ec_point_formats)
 560                         {
 561                         unsigned char *sdata = data;
 562                         int ecpointformatlist_length = *(sdata++);
 563
 564                         if (ecpointformatlist_length != size - 1)
 565                                 {
 566                                 *al = TLS1_AD_DECODE_ERROR;
 567                                 return 0;
 568                                 }
 569                         s->session->tlsext_ecpointformatlist_length = 0;
 570                         if (s->session->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->session->tlsext_ecpointformatlist);
 571                         if ((s->session->tlsext_ecpointformatlist = OPENSSL_malloc(ecpointformatlist_length)) == NULL)
 572                                 {
 573                                 *al = TLS1_AD_INTERNAL_ERROR;
 574                                 return 0;
 575                                 }
 576                         s->session->tlsext_ecpointformatlist_length = ecpointformatlist_length;
 577                         memcpy(s->session->tlsext_ecpointformatlist, sdata, ecpointformatlist_length);
 578 #if 0
 579                         fprintf(stderr,"ssl_parse_serverhello_tlsext s->session->tlsext_ecpointformatlist ");
 580                         sdata = s->session->tlsext_ecpointformatlist;
 581                         for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
 582                                 fprintf(stderr,"%i ",*(sdata++));
 583                         fprintf(stderr,"\n");
 584 #endif
 585                         }
 586 #endif /* OPENSSL_NO_EC */
 587
 588                 else if (type == TLSEXT_TYPE_session_ticket)
 589                         {
 590                         if ((SSL_get_options(s) & SSL_OP_NO_TICKET)
 591                                 || (size > 0))
 592                                 {
 593                                 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
 594                                 return 0;
 595                                 }
 596                         s->tlsext_ticket_expected = 1;
 597                         }
 598                 data+=size;
 599                 }
 600
 601         if (data != d+n)
 602                 {
 603                 *al = SSL_AD_DECODE_ERROR;
 604                 return 0;
 605                 }
 606
 607         if (!s->hit && tlsext_servername == 1)
 608                 {
 609                 if (s->tlsext_hostname)
 610                         {
 611                         if (s->session->tlsext_hostname == NULL)
 612                                 {
 613                                 s->session->tlsext_hostname = BUF_strdup(s->tlsext_hostname);
 614                                 if (!s->session->tlsext_hostname)
 615                                         {
 616                                         *al = SSL_AD_UNRECOGNIZED_NAME;
 617                                         return 0;
 618                                         }
 619                                 }
 620                         else
 621                                 {
 622                                 *al = SSL_AD_DECODE_ERROR;
 623                                 return 0;
 624                                 }
 625                         }
 626                 }
 627
 628         *p = data;
 629         return 1;
 630         }
 631
 632 #ifndef OPENSSL_NO_EC
 633 static int nid_list[] =
 634         {
 635                 NID_sect163k1, /* sect163k1 (1) */
 636                 NID_sect163r1, /* sect163r1 (2) */
 637                 NID_sect163r2, /* sect163r2 (3) */
 638                 NID_sect193r1, /* sect193r1 (4) */
 639                 NID_sect193r2, /* sect193r2 (5) */
 640                 NID_sect233k1, /* sect233k1 (6) */
 641                 NID_sect233r1, /* sect233r1 (7) */
 642                 NID_sect239k1, /* sect239k1 (8) */
 643                 NID_sect283k1, /* sect283k1 (9) */
 644                 NID_sect283r1, /* sect283r1 (10) */
 645                 NID_sect409k1, /* sect409k1 (11) */
 646                 NID_sect409r1, /* sect409r1 (12) */
 647                 NID_sect571k1, /* sect571k1 (13) */
 648                 NID_sect571r1, /* sect571r1 (14) */
 649                 NID_secp160k1, /* secp160k1 (15) */
 650                 NID_secp160r1, /* secp160r1 (16) */
 651                 NID_secp160r2, /* secp160r2 (17) */
 652                 NID_secp192k1, /* secp192k1 (18) */
 653                 NID_X9_62_prime192v1, /* secp192r1 (19) */
 654                 NID_secp224k1, /* secp224k1 (20) */
 655                 NID_secp224r1, /* secp224r1 (21) */
 656                 NID_secp256k1, /* secp256k1 (22) */
 657                 NID_X9_62_prime256v1, /* secp256r1 (23) */
 658                 NID_secp384r1, /* secp384r1 (24) */
 659                 NID_secp521r1  /* secp521r1 (25) */
 660         };
 661
 662 int tls1_ec_curve_id2nid(int curve_id)
 663         {
 664         /* ECC curves from draft-ietf-tls-ecc-12.txt (Oct. 17, 2005) */
 665         if ((curve_id < 1) || (curve_id > sizeof(nid_list)/sizeof(nid_list[0]))) return 0;
 666         return nid_list[curve_id-1];
 667         }
 668
 669 int tls1_ec_nid2curve_id(int nid)
 670         {
 671         /* ECC curves from draft-ietf-tls-ecc-12.txt (Oct. 17, 2005) */
 672         switch (nid)
 673                 {
 674         case NID_sect163k1: /* sect163k1 (1) */
 675                 return 1;
 676         case NID_sect163r1: /* sect163r1 (2) */
 677                 return 2;
 678         case NID_sect163r2: /* sect163r2 (3) */
 679                 return 3;
 680         case NID_sect193r1: /* sect193r1 (4) */
 681                 return 4;
 682         case NID_sect193r2: /* sect193r2 (5) */
 683                 return 5;
 684         case NID_sect233k1: /* sect233k1 (6) */
 685                 return 6;
 686         case NID_sect233r1: /* sect233r1 (7) */
 687                 return 7;
 688         case NID_sect239k1: /* sect239k1 (8) */
 689                 return 8;
 690         case NID_sect283k1: /* sect283k1 (9) */
 691                 return 9;
 692         case NID_sect283r1: /* sect283r1 (10) */
 693                 return 10;
 694         case NID_sect409k1: /* sect409k1 (11) */
 695                 return 11;
 696         case NID_sect409r1: /* sect409r1 (12) */
 697                 return 12;
 698         case NID_sect571k1: /* sect571k1 (13) */
 699                 return 13;
 700         case NID_sect571r1: /* sect571r1 (14) */
 701                 return 14;
 702         case NID_secp160k1: /* secp160k1 (15) */
 703                 return 15;
 704         case NID_secp160r1: /* secp160r1 (16) */
 705                 return 16;
 706         case NID_secp160r2: /* secp160r2 (17) */
 707                 return 17;
 708         case NID_secp192k1: /* secp192k1 (18) */
 709                 return 18;
 710         case NID_X9_62_prime192v1: /* secp192r1 (19) */
 711                 return 19;
 712         case NID_secp224k1: /* secp224k1 (20) */
 713                 return 20;
 714         case NID_secp224r1: /* secp224r1 (21) */
 715                 return 21;
 716         case NID_secp256k1: /* secp256k1 (22) */
 717                 return 22;
 718         case NID_X9_62_prime256v1: /* secp256r1 (23) */
 719                 return 23;
 720         case NID_secp384r1: /* secp384r1 (24) */
 721                 return 24;
 722         case NID_secp521r1:  /* secp521r1 (25) */
 723                 return 25;
 724         default:
 725                 return 0;
 726                 }
 727         }
 728 #endif /* OPENSSL_NO_EC */
 729
 730 int ssl_prepare_clienthello_tlsext(SSL *s)
 731         {
 732 #ifndef OPENSSL_NO_EC
 733         /* If we are client and using an elliptic curve cryptography cipher suite, send the point formats
 734          * and elliptic curves we support.
 735          */
 736         int using_ecc = 0;
 737         int i;
 738         unsigned char *j;
 739         unsigned long alg_k, alg_a;
 740         STACK_OF(SSL_CIPHER) *cipher_stack = SSL_get_ciphers(s);
 741
 742         for (i = 0; i < sk_SSL_CIPHER_num(cipher_stack); i++)
 743                 {
 744                 SSL_CIPHER *c = sk_SSL_CIPHER_value(cipher_stack, i);
 745
 746                 alg_k = c->algorithm_mkey;
 747                 alg_a = c->algorithm_auth;
 748                 if ((alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe) || (alg_a & SSL_aECDSA)))
 749                         {
 750                         using_ecc = 1;
 751                         break;
 752                         }
 753                 }
 754         using_ecc = using_ecc && (s->version == TLS1_VERSION);
 755         if (using_ecc)
 756                 {
 757                 if (s->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->tlsext_ecpointformatlist);
 758                 if ((s->tlsext_ecpointformatlist = OPENSSL_malloc(3)) == NULL)
 759                         {
 760                         SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
 761                         return -1;
 762                         }
 763                 s->tlsext_ecpointformatlist_length = 3;
 764                 s->tlsext_ecpointformatlist[0] = TLSEXT_ECPOINTFORMAT_uncompressed;
 765                 s->tlsext_ecpointformatlist[1] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime;
 766                 s->tlsext_ecpointformatlist[2] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2;
 767
 768                 /* we support all named elliptic curves in draft-ietf-tls-ecc-12 */
 769                 if (s->tlsext_ellipticcurvelist != NULL) OPENSSL_free(s->tlsext_ellipticcurvelist);
 770                 s->tlsext_ellipticcurvelist_length = sizeof(nid_list)/sizeof(nid_list[0]) * 2;
 771                 if ((s->tlsext_ellipticcurvelist = OPENSSL_malloc(s->tlsext_ellipticcurvelist_length)) == NULL)
 772                         {
 773                         s->tlsext_ellipticcurvelist_length = 0;
 774                         SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
 775                         return -1;
 776                         }
 777                 for (i = 1, j = s->tlsext_ellipticcurvelist; i <= sizeof(nid_list)/sizeof(nid_list[0]); i++)
 778                         s2n(i,j);
 779                 }
 780 #endif /* OPENSSL_NO_EC */
 781         return 1;
 782         }
 783
 784 int ssl_prepare_serverhello_tlsext(SSL *s)
 785         {
 786 #ifndef OPENSSL_NO_EC
 787         /* If we are server and using an ECC cipher suite, send the point formats we support
 788          * if the client sent us an ECPointsFormat extension.  Note that the server is not
 789          * supposed to send an EllipticCurves extension.
 790          */
 791
 792         unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
 793         unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth;
 794         int using_ecc = (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) || (alg_a & SSL_aECDSA);
 795         using_ecc = using_ecc && (s->session->tlsext_ecpointformatlist != NULL);
 796
 797         if (using_ecc)
 798                 {
 799                 if (s->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->tlsext_ecpointformatlist);
 800                 if ((s->tlsext_ecpointformatlist = OPENSSL_malloc(3)) == NULL)
 801                         {
 802                         SSLerr(SSL_F_SSL_PREPARE_SERVERHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
 803                         return -1;
 804                         }
 805                 s->tlsext_ecpointformatlist_length = 3;
 806                 s->tlsext_ecpointformatlist[0] = TLSEXT_ECPOINTFORMAT_uncompressed;
 807                 s->tlsext_ecpointformatlist[1] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime;
 808                 s->tlsext_ecpointformatlist[2] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2;
 809                 }
 810 #endif /* OPENSSL_NO_EC */
 811         return 1;
 812         }
 813
 814 int ssl_check_clienthello_tlsext(SSL *s)
 815         {
 816         int ret=SSL_TLSEXT_ERR_NOACK;
 817         int al = SSL_AD_UNRECOGNIZED_NAME;
 818
 819 #ifndef OPENSSL_NO_EC
 820         /* The handling of the ECPointFormats extension is done elsewhere, namely in
 821          * ssl3_choose_cipher in s3_lib.c.
 822          */
 823         /* The handling of the EllipticCurves extension is done elsewhere, namely in
 824          * ssl3_choose_cipher in s3_lib.c.
 825          */
 826 #endif
 827
 828         if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0)
 829                 ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg);
 830         else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0)
 831                 ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg);
 832
 833         switch (ret)
 834                 {
 835                 case SSL_TLSEXT_ERR_ALERT_FATAL:
 836                         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 837                         return -1;
 838
 839                 case SSL_TLSEXT_ERR_ALERT_WARNING:
 840                         ssl3_send_alert(s,SSL3_AL_WARNING,al);
 841                         return 1;
 842
 843                 case SSL_TLSEXT_ERR_NOACK:
 844                         s->servername_done=0;
 845                         default:
 846                 return 1;
 847                 }
 848         }
 849
 850 int ssl_check_serverhello_tlsext(SSL *s)
 851         {
 852         int ret=SSL_TLSEXT_ERR_NOACK;
 853         int al = SSL_AD_UNRECOGNIZED_NAME;
 854
 855 #ifndef OPENSSL_NO_EC
 856         /* If we are client and using an elliptic curve cryptography cipher suite, then server
 857          * must return a an EC point formats lists containing uncompressed.
 858          */
 859         unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
 860         unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth;
 861         if ((s->tlsext_ecpointformatlist != NULL) && (s->tlsext_ecpointformatlist_length > 0) &&
 862             ((alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) || (alg_a & SSL_aECDSA)))
 863                 {
 864                 /* we are using an ECC cipher */
 865                 size_t i;
 866                 unsigned char *list;
 867                 int found_uncompressed = 0;
 868                 if ((s->session->tlsext_ecpointformatlist == NULL) || (s->session->tlsext_ecpointformatlist_length == 0))
 869                         {
 870                         SSLerr(SSL_F_SSL_CHECK_SERVERHELLO_TLSEXT,SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST);
 871                         return -1;
 872                         }
 873                 list = s->session->tlsext_ecpointformatlist;
 874                 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
 875                         {
 876                         if (*(list++) == TLSEXT_ECPOINTFORMAT_uncompressed)
 877                                 {
 878                                 found_uncompressed = 1;
 879                                 break;
 880                                 }
 881                         }
 882                 if (!found_uncompressed)
 883                         {
 884                         SSLerr(SSL_F_SSL_CHECK_SERVERHELLO_TLSEXT,SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST);
 885                         return -1;
 886                         }
 887                 }
 888         ret = SSL_TLSEXT_ERR_OK;
 889 #endif /* OPENSSL_NO_EC */
 890
 891         if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0)
 892                 ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg);
 893         else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0)
 894                 ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg);
 895
 896         switch (ret)
 897                 {
 898                 case SSL_TLSEXT_ERR_ALERT_FATAL:
 899                         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 900                         return -1;
 901
 902                 case SSL_TLSEXT_ERR_ALERT_WARNING:
 903                         ssl3_send_alert(s,SSL3_AL_WARNING,al);
 904                         return 1;
 905
 906                 case SSL_TLSEXT_ERR_NOACK:
 907                         s->servername_done=0;
 908                         default:
 909                 return 1;
 910                 }
 911         }
 912
 913 /* Since the server cache lookup is done early on in the processing of client
 914  * hello and other operations depend on the result we need to handle any TLS
 915  * session ticket extension at the same time.
 916  */
 917
 918 int tls1_process_ticket(SSL *s, unsigned char *session_id, int len,
 919                                 const unsigned char *limit, SSL_SESSION **ret)
 920         {
 921         /* Point after session ID in client hello */
 922         const unsigned char *p = session_id + len;
 923         unsigned short i;
 924         if ((s->version <= SSL3_VERSION) || !limit)
 925                 return 1;
 926         if (p >= limit)
 927                 return -1;
 928         /* Skip past cipher list */
 929         n2s(p, i);
 930         p+= i;
 931         if (p >= limit)
 932                 return -1;
 933         /* Skip past compression algorithm list */
 934         i = *(p++);
 935         p += i;
 936         if (p > limit)
 937                 return -1;
 938         /* Now at start of extensions */
 939         if ((p + 2) >= limit)
 940                 return 1;
 941         n2s(p, i);
 942         while ((p + 4) <= limit)
 943                 {
 944                 unsigned short type, size;
 945                 n2s(p, type);
 946                 n2s(p, size);
 947                 if (p + size > limit)
 948                         return 1;
 949                 if (type == TLSEXT_TYPE_session_ticket)
 950                         {
 951                         /* If tickets disabled indicate cache miss which will
 952                          * trigger a full handshake
 953                          */
 954                         if (SSL_get_options(s) & SSL_OP_NO_TICKET)
 955                                 return 0;
 956                         /* If zero length not client will accept a ticket
 957                          * and indicate cache miss to trigger full handshake
 958                          */
 959                         if (size == 0)
 960                                 {
 961                                 s->tlsext_ticket_expected = 1;
 962                                 return 0;       /* Cache miss */
 963                                 }
 964                         return tls_decrypt_ticket(s, p, size, session_id, len,
 965                                                                         ret);
 966                         }
 967                 p += size;
 968                 }
 969         return 1;
 970         }
 971
 972 static int tls_decrypt_ticket(SSL *s, const unsigned char *etick, int eticklen,
 973                                 const unsigned char *sess_id, int sesslen,
 974                                 SSL_SESSION **psess)
 975         {
 976         SSL_SESSION *sess;
 977         unsigned char *sdec;
 978         const unsigned char *p;
 979         int slen, mlen;
 980         unsigned char tick_hmac[EVP_MAX_MD_SIZE];
 981         HMAC_CTX hctx;
 982         EVP_CIPHER_CTX ctx;
 983         /* Attempt to process session ticket, first conduct sanity and
 984          * integrity checks on ticket.
 985          */
 986         mlen = EVP_MD_size(EVP_sha1());
 987         eticklen -= mlen;
 988         /* Need at least keyname + iv + some encrypted data */
 989         if (eticklen < 48)
 990                 goto tickerr;
 991         /* Check key name matches */
 992         if (memcmp(etick, s->ctx->tlsext_tick_key_name, 16))
 993                 goto tickerr;
 994         /* Check HMAC of encrypted ticket */
 995         HMAC_CTX_init(&hctx);
 996         HMAC_Init_ex(&hctx, s->ctx->tlsext_tick_hmac_key, 16,
 997                                 EVP_sha1(), NULL);
 998         HMAC_Update(&hctx, etick, eticklen);
 999         HMAC_Final(&hctx, tick_hmac, NULL);
1000         HMAC_CTX_cleanup(&hctx);
1001         if (memcmp(tick_hmac, etick + eticklen, mlen))
1002                 goto tickerr;
1003         /* Set p to start of IV */
1004         p = etick + 16;
1005         EVP_CIPHER_CTX_init(&ctx);
1006         /* Attempt to decrypt session data */
1007         EVP_DecryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
1008                                         s->ctx->tlsext_tick_aes_key, p);
1009         /* Move p after IV to start of encrypted ticket, update length */
1010         p += 16;
1011         eticklen -= 32;
1012         sdec = OPENSSL_malloc(eticklen);
1013         if (!sdec)
1014                 {
1015                 EVP_CIPHER_CTX_cleanup(&ctx);
1016                 return -1;
1017                 }
1018         EVP_DecryptUpdate(&ctx, sdec, &slen, p, eticklen);
1019         if (EVP_DecryptFinal(&ctx, sdec + slen, &mlen) <= 0)
1020                 goto tickerr;
1021         slen += mlen;
1022         EVP_CIPHER_CTX_cleanup(&ctx);
1023         p = sdec;
1024
1025         sess = d2i_SSL_SESSION(NULL, &p, slen);
1026         OPENSSL_free(sdec);
1027         if (sess)
1028                 {
1029                 /* The session ID if non-empty is used by some clients to
1030                  * detect that the ticket has been accepted. So we copy it to
1031                  * the session structure. If it is empty set length to zero
1032                  * as required by standard.
1033                  */
1034                 if (sesslen)
1035                         memcpy(sess->session_id, sess_id, sesslen);
1036                 sess->session_id_length = sesslen;
1037                 *psess = sess;
1038                 return 1;
1039                 }
1040         /* If session decrypt failure indicate a cache miss and set state to
1041          * send a new ticket
1042          */
1043         tickerr:
1044         s->tlsext_ticket_expected = 1;
1045         return 0;
1046         }
1047
1048 #endif