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 #ifndef OPENSSL_NO_TLSEXT
 121 static int tls_decrypt_ticket(SSL *s, const unsigned char *tick, int ticklen,
 122                                 const unsigned char *sess_id, int sesslen,
 123                                 SSL_SESSION **psess);
 124 #endif
 125
 126 SSL3_ENC_METHOD TLSv1_enc_data={
 127         tls1_enc,
 128         tls1_mac,
 129         tls1_setup_key_block,
 130         tls1_generate_master_secret,
 131         tls1_change_cipher_state,
 132         tls1_final_finish_mac,
 133         TLS1_FINISH_MAC_LENGTH,
 134         tls1_cert_verify_mac,
 135         TLS_MD_CLIENT_FINISH_CONST,TLS_MD_CLIENT_FINISH_CONST_SIZE,
 136         TLS_MD_SERVER_FINISH_CONST,TLS_MD_SERVER_FINISH_CONST_SIZE,
 137         tls1_alert_code,
 138         };
 139
 140 long tls1_default_timeout(void)
 141         {
 142         /* 2 hours, the 24 hours mentioned in the TLSv1 spec
 143          * is way too long for http, the cache would over fill */
 144         return(60*60*2);
 145         }
 146
 147 int tls1_new(SSL *s)
 148         {
 149         if (!ssl3_new(s)) return(0);
 150         s->method->ssl_clear(s);
 151         return(1);
 152         }
 153
 154 void tls1_free(SSL *s)
 155         {
 156         ssl3_free(s);
 157         }
 158
 159 void tls1_clear(SSL *s)
 160         {
 161         ssl3_clear(s);
 162         s->version=TLS1_VERSION;
 163         }
 164
 165
 166 #ifndef OPENSSL_NO_TLSEXT
 167 unsigned char *ssl_add_clienthello_tlsext(SSL *s, unsigned char *p, unsigned char *limit)
 168         {
 169         int extdatalen=0;
 170         unsigned char *ret = p;
 171
 172         ret+=2;
 173
 174         if (ret>=limit) return NULL; /* this really never occurs, but ... */
 175
 176         if (s->tlsext_hostname != NULL)
 177                 {
 178                 /* Add TLS extension servername to the Client Hello message */
 179                 unsigned long size_str;
 180                 long lenmax;
 181
 182                 /* check for enough space.
 183                    4 for the servername type and entension length
 184                    2 for servernamelist length
 185                    1 for the hostname type
 186                    2 for hostname length
 187                    + hostname length
 188                 */
 189
 190                 if ((lenmax = limit - p - 9) < 0
 191                 || (size_str = strlen(s->tlsext_hostname)) > (unsigned long)lenmax)
 192                         return NULL;
 193
 194                 /* extension type and length */
 195                 s2n(TLSEXT_TYPE_server_name,ret);
 196                 s2n(size_str+5,ret);
 197
 198                 /* length of servername list */
 199                 s2n(size_str+3,ret);
 200
 201                 /* hostname type, length and hostname */
 202                 *(ret++) = (unsigned char) TLSEXT_NAMETYPE_host_name;
 203                 s2n(size_str,ret);
 204                 memcpy(ret, s->tlsext_hostname, size_str);
 205                 ret+=size_str;
 206
 207                 }
 208 #ifndef OPENSSL_NO_EC
 209         if (s->tlsext_ecpointformatlist != NULL)
 210                 {
 211                 /* Add TLS extension ECPointFormats to the ClientHello message */
 212                 long lenmax;
 213
 214                 if ((lenmax = limit - p - 5) < 0) return NULL;
 215                 if (s->tlsext_ecpointformatlist_length > (unsigned long)lenmax) return NULL;
 216                 if (s->tlsext_ecpointformatlist_length > 255)
 217                         {
 218                         SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
 219                         return NULL;
 220                         }
 221
 222                 s2n(TLSEXT_TYPE_ec_point_formats,ret);
 223                 s2n(s->tlsext_ecpointformatlist_length + 1,ret);
 224                 *(ret++) = (unsigned char) s->tlsext_ecpointformatlist_length;
 225                 memcpy(ret, s->tlsext_ecpointformatlist, s->tlsext_ecpointformatlist_length);
 226                 ret+=s->tlsext_ecpointformatlist_length;
 227                 }
 228         if (s->tlsext_ellipticcurvelist != NULL)
 229                 {
 230                 /* Add TLS extension EllipticCurves to the ClientHello message */
 231                 long lenmax;
 232
 233                 if ((lenmax = limit - p - 6) < 0) return NULL;
 234                 if (s->tlsext_ellipticcurvelist_length > (unsigned long)lenmax) return NULL;
 235                 if (s->tlsext_ellipticcurvelist_length > 65532)
 236                         {
 237                         SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
 238                         return NULL;
 239                         }
 240
 241                 s2n(TLSEXT_TYPE_elliptic_curves,ret);
 242                 s2n(s->tlsext_ellipticcurvelist_length + 2, ret);
 243
 244                 /* NB: draft-ietf-tls-ecc-12.txt uses a one-byte prefix for
 245                  * elliptic_curve_list, but the examples use two bytes.
 246                  * http://www1.ietf.org/mail-archive/web/tls/current/msg00538.html
 247                  * resolves this to two bytes.
 248                  */
 249                 s2n(s->tlsext_ellipticcurvelist_length, ret);
 250                 memcpy(ret, s->tlsext_ellipticcurvelist, s->tlsext_ellipticcurvelist_length);
 251                 ret+=s->tlsext_ellipticcurvelist_length;
 252                 }
 253 #endif /* OPENSSL_NO_EC */
 254
 255         if (!(SSL_get_options(s) & SSL_OP_NO_TICKET))
 256                 {
 257                 int ticklen;
 258                 if (s->session && s->session->tlsext_tick)
 259                         ticklen = s->session->tlsext_ticklen;
 260                 else
 261                         ticklen = 0;
 262                 /* Check for enough room 2 for extension type, 2 for len
 263                  * rest for ticket
 264                  */
 265                 if (limit - p - 4 - ticklen < 0)
 266                         return NULL;
 267                 s2n(TLSEXT_TYPE_session_ticket,ret);
 268                 s2n(ticklen,ret);
 269                 if (ticklen)
 270                         {
 271                         memcpy(ret, s->session->tlsext_tick, ticklen);
 272                         ret += ticklen;
 273                         }
 274                 }
 275
 276         if ((extdatalen = ret-p-2)== 0)
 277                 return p;
 278
 279         s2n(extdatalen,p);
 280         return ret;
 281         }
 282
 283 unsigned char *ssl_add_serverhello_tlsext(SSL *s, unsigned char *p, unsigned char *limit)
 284         {
 285         int extdatalen=0;
 286         unsigned char *ret = p;
 287
 288         ret+=2;
 289         if (ret>=limit) return NULL; /* this really never occurs, but ... */
 290
 291         if (!s->hit && s->servername_done == 1 && s->session->tlsext_hostname != NULL)
 292                 {
 293                 if (limit - p - 4 < 0) return NULL;
 294
 295                 s2n(TLSEXT_TYPE_server_name,ret);
 296                 s2n(0,ret);
 297                 }
 298 #ifndef OPENSSL_NO_EC
 299         if (s->tlsext_ecpointformatlist != NULL)
 300                 {
 301                 /* Add TLS extension ECPointFormats to the ServerHello message */
 302                 long lenmax;
 303
 304                 if ((lenmax = limit - p - 5) < 0) return NULL;
 305                 if (s->tlsext_ecpointformatlist_length > (unsigned long)lenmax) return NULL;
 306                 if (s->tlsext_ecpointformatlist_length > 255)
 307                         {
 308                         SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
 309                         return NULL;
 310                         }
 311
 312                 s2n(TLSEXT_TYPE_ec_point_formats,ret);
 313                 s2n(s->tlsext_ecpointformatlist_length + 1,ret);
 314                 *(ret++) = (unsigned char) s->tlsext_ecpointformatlist_length;
 315                 memcpy(ret, s->tlsext_ecpointformatlist, s->tlsext_ecpointformatlist_length);
 316                 ret+=s->tlsext_ecpointformatlist_length;
 317
 318                 }
 319         /* Currently the server should not respond with a SupportedCurves extension */
 320 #endif /* OPENSSL_NO_EC */
 321
 322         if (s->tlsext_ticket_expected
 323                 && !(SSL_get_options(s) & SSL_OP_NO_TICKET))
 324                 {
 325                 if (limit - p - 4 < 0) return NULL;
 326                 s2n(TLSEXT_TYPE_session_ticket,ret);
 327                 s2n(0,ret);
 328                 }
 329
 330         if ((extdatalen = ret-p-2)== 0)
 331                 return p;
 332
 333         s2n(extdatalen,p);
 334         return ret;
 335         }
 336
 337 int ssl_parse_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al)
 338         {
 339         unsigned short type;
 340         unsigned short size;
 341         unsigned short len;
 342         unsigned char *data = *p;
 343         s->servername_done = 0;
 344
 345         if (data >= (d+n-2))
 346                 return 1;
 347         n2s(data,len);
 348
 349         if (data > (d+n-len))
 350                 return 1;
 351
 352         while (data <= (d+n-4))
 353                 {
 354                 n2s(data,type);
 355                 n2s(data,size);
 356
 357                 if (data+size > (d+n))
 358                         return 1;
 359
 360                 if (s->tlsext_debug_cb)
 361                         s->tlsext_debug_cb(s, 0, type, data, size,
 362                                                 s->tlsext_debug_arg);
 363 /* The servername extension is treated as follows:
 364
 365    - Only the hostname type is supported with a maximum length of 255.
 366    - The servername is rejected if too long or if it contains zeros,
 367      in which case an fatal alert is generated.
 368    - The servername field is maintained together with the session cache.
 369    - When a session is resumed, the servername call back invoked in order
 370      to allow the application to position itself to the right context.
 371    - The servername is acknowledged if it is new for a session or when
 372      it is identical to a previously used for the same session.
 373      Applications can control the behaviour.  They can at any time
 374      set a 'desirable' servername for a new SSL object. This can be the
 375      case for example with HTTPS when a Host: header field is received and
 376      a renegotiation is requested. In this case, a possible servername
 377      presented in the new client hello is only acknowledged if it matches
 378      the value of the Host: field.
 379    - Applications must  use SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
 380      if they provide for changing an explicit servername context for the session,
 381      i.e. when the session has been established with a servername extension.
 382    - On session reconnect, the servername extension may be absent.
 383
 384 */
 385
 386                 if (type == TLSEXT_TYPE_server_name)
 387                         {
 388                         unsigned char *sdata;
 389                         int servname_type;
 390                         int dsize;
 391
 392                         if (size < 2)
 393                                 {
 394                                 *al = SSL_AD_DECODE_ERROR;
 395                                 return 0;
 396                                 }
 397                         n2s(data,dsize);
 398                         size -= 2;
 399                         if (dsize > size  )
 400                                 {
 401                                 *al = SSL_AD_DECODE_ERROR;
 402                                 return 0;
 403                                 }
 404
 405                         sdata = data;
 406                         while (dsize > 3)
 407                                 {
 408                                 servname_type = *(sdata++);
 409                                 n2s(sdata,len);
 410                                 dsize -= 3;
 411
 412                                 if (len > dsize)
 413                                         {
 414                                         *al = SSL_AD_DECODE_ERROR;
 415                                         return 0;
 416                                         }
 417                                 if (s->servername_done == 0)
 418                                 switch (servname_type)
 419                                         {
 420                                 case TLSEXT_NAMETYPE_host_name:
 421                                         if (s->session->tlsext_hostname == NULL)
 422                                                 {
 423                                                 if (len > TLSEXT_MAXLEN_host_name ||
 424                                                         ((s->session->tlsext_hostname = OPENSSL_malloc(len+1)) == NULL))
 425                                                         {
 426                                                         *al = TLS1_AD_UNRECOGNIZED_NAME;
 427                                                         return 0;
 428                                                         }
 429                                                 memcpy(s->session->tlsext_hostname, sdata, len);
 430                                                 s->session->tlsext_hostname[len]='\0';
 431                                                 if (strlen(s->session->tlsext_hostname) != len) {
 432                                                         OPENSSL_free(s->session->tlsext_hostname);
 433                                                         *al = TLS1_AD_UNRECOGNIZED_NAME;
 434                                                         return 0;
 435                                                 }
 436                                                 s->servername_done = 1;
 437
 438                                                 }
 439                                         else
 440                                                 s->servername_done = strlen(s->session->tlsext_hostname) == len
 441                                                         && strncmp(s->session->tlsext_hostname, (char *)sdata, len) == 0;
 442
 443                                         break;
 444
 445                                 default:
 446                                         break;
 447                                         }
 448
 449                                 dsize -= len;
 450                                 }
 451                         if (dsize != 0)
 452                                 {
 453                                 *al = SSL_AD_DECODE_ERROR;
 454                                 return 0;
 455                                 }
 456
 457                         }
 458
 459 #ifndef OPENSSL_NO_EC
 460                 else if (type == TLSEXT_TYPE_ec_point_formats)
 461                         {
 462                         unsigned char *sdata = data;
 463                         int ecpointformatlist_length = *(sdata++);
 464
 465                         if (ecpointformatlist_length != size - 1)
 466                                 {
 467                                 *al = TLS1_AD_DECODE_ERROR;
 468                                 return 0;
 469                                 }
 470                         s->session->tlsext_ecpointformatlist_length = 0;
 471                         if (s->session->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->session->tlsext_ecpointformatlist);
 472                         if ((s->session->tlsext_ecpointformatlist = OPENSSL_malloc(ecpointformatlist_length)) == NULL)
 473                                 {
 474                                 *al = TLS1_AD_INTERNAL_ERROR;
 475                                 return 0;
 476                                 }
 477                         s->session->tlsext_ecpointformatlist_length = ecpointformatlist_length;
 478                         memcpy(s->session->tlsext_ecpointformatlist, sdata, ecpointformatlist_length);
 479 #if 0
 480                         fprintf(stderr,"ssl_parse_clienthello_tlsext s->session->tlsext_ecpointformatlist (length=%i) ", s->session->tlsext_ecpointformatlist_length);
 481                         sdata = s->session->tlsext_ecpointformatlist;
 482                         for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
 483                                 fprintf(stderr,"%i ",*(sdata++));
 484                         fprintf(stderr,"\n");
 485 #endif
 486                         }
 487                 else if (type == TLSEXT_TYPE_elliptic_curves)
 488                         {
 489                         unsigned char *sdata = data;
 490                         int ellipticcurvelist_length = (*(sdata++) << 8);
 491                         ellipticcurvelist_length += (*(sdata++));
 492
 493                         if (ellipticcurvelist_length != size - 2)
 494                                 {
 495                                 *al = TLS1_AD_DECODE_ERROR;
 496                                 return 0;
 497                                 }
 498                         s->session->tlsext_ellipticcurvelist_length = 0;
 499                         if (s->session->tlsext_ellipticcurvelist != NULL) OPENSSL_free(s->session->tlsext_ellipticcurvelist);
 500                         if ((s->session->tlsext_ellipticcurvelist = OPENSSL_malloc(ellipticcurvelist_length)) == NULL)
 501                                 {
 502                                 *al = TLS1_AD_INTERNAL_ERROR;
 503                                 return 0;
 504                                 }
 505                         s->session->tlsext_ellipticcurvelist_length = ellipticcurvelist_length;
 506                         memcpy(s->session->tlsext_ellipticcurvelist, sdata, ellipticcurvelist_length);
 507 #if 0
 508                         fprintf(stderr,"ssl_parse_clienthello_tlsext s->session->tlsext_ellipticcurvelist (length=%i) ", s->session->tlsext_ellipticcurvelist_length);
 509                         sdata = s->session->tlsext_ellipticcurvelist;
 510                         for (i = 0; i < s->session->tlsext_ellipticcurvelist_length; i++)
 511                                 fprintf(stderr,"%i ",*(sdata++));
 512                         fprintf(stderr,"\n");
 513 #endif
 514                         }
 515 #endif /* OPENSSL_NO_EC */
 516                 /* session ticket processed earlier */
 517                 data+=size;
 518                 }
 519
 520         *p = data;
 521         return 1;
 522         }
 523
 524 int ssl_parse_serverhello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al)
 525         {
 526         unsigned short type;
 527         unsigned short size;
 528         unsigned short len;
 529         unsigned char *data = *p;
 530
 531         int tlsext_servername = 0;
 532
 533         if (data >= (d+n-2))
 534                 return 1;
 535
 536         n2s(data,len);
 537
 538         while(data <= (d+n-4))
 539                 {
 540                 n2s(data,type);
 541                 n2s(data,size);
 542
 543                 if (data+size > (d+n))
 544                         return 1;
 545
 546                 if (s->tlsext_debug_cb)
 547                         s->tlsext_debug_cb(s, 1, type, data, size,
 548                                                 s->tlsext_debug_arg);
 549
 550                 if (type == TLSEXT_TYPE_server_name)
 551                         {
 552                         if (s->tlsext_hostname == NULL || size > 0)
 553                                 {
 554                                 *al = TLS1_AD_UNRECOGNIZED_NAME;
 555                                 return 0;
 556                                 }
 557                         tlsext_servername = 1;
 558                         }
 559
 560 #ifndef OPENSSL_NO_EC
 561                 else if (type == TLSEXT_TYPE_ec_point_formats)
 562                         {
 563                         unsigned char *sdata = data;
 564                         int ecpointformatlist_length = *(sdata++);
 565
 566                         if (ecpointformatlist_length != size - 1)
 567                                 {
 568                                 *al = TLS1_AD_DECODE_ERROR;
 569                                 return 0;
 570                                 }
 571                         s->session->tlsext_ecpointformatlist_length = 0;
 572                         if (s->session->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->session->tlsext_ecpointformatlist);
 573                         if ((s->session->tlsext_ecpointformatlist = OPENSSL_malloc(ecpointformatlist_length)) == NULL)
 574                                 {
 575                                 *al = TLS1_AD_INTERNAL_ERROR;
 576                                 return 0;
 577                                 }
 578                         s->session->tlsext_ecpointformatlist_length = ecpointformatlist_length;
 579                         memcpy(s->session->tlsext_ecpointformatlist, sdata, ecpointformatlist_length);
 580 #if 0
 581                         fprintf(stderr,"ssl_parse_serverhello_tlsext s->session->tlsext_ecpointformatlist ");
 582                         sdata = s->session->tlsext_ecpointformatlist;
 583                         for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
 584                                 fprintf(stderr,"%i ",*(sdata++));
 585                         fprintf(stderr,"\n");
 586 #endif
 587                         }
 588 #endif /* OPENSSL_NO_EC */
 589
 590                 else if (type == TLSEXT_TYPE_session_ticket)
 591                         {
 592                         if ((SSL_get_options(s) & SSL_OP_NO_TICKET)
 593                                 || (size > 0))
 594                                 {
 595                                 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
 596                                 return 0;
 597                                 }
 598                         s->tlsext_ticket_expected = 1;
 599                         }
 600                 data+=size;
 601                 }
 602
 603         if (data != d+n)
 604                 {
 605                 *al = SSL_AD_DECODE_ERROR;
 606                 return 0;
 607                 }
 608
 609         if (!s->hit && tlsext_servername == 1)
 610                 {
 611                 if (s->tlsext_hostname)
 612                         {
 613                         if (s->session->tlsext_hostname == NULL)
 614                                 {
 615                                 s->session->tlsext_hostname = BUF_strdup(s->tlsext_hostname);
 616                                 if (!s->session->tlsext_hostname)
 617                                         {
 618                                         *al = SSL_AD_UNRECOGNIZED_NAME;
 619                                         return 0;
 620                                         }
 621                                 }
 622                         else
 623                                 {
 624                                 *al = SSL_AD_DECODE_ERROR;
 625                                 return 0;
 626                                 }
 627                         }
 628                 }
 629
 630         *p = data;
 631         return 1;
 632         }
 633
 634
 635 int ssl_prepare_clienthello_tlsext(SSL *s)
 636         {
 637 #ifndef OPENSSL_NO_EC
 638         /* If we are client and using an elliptic curve cryptography cipher suite, send the point formats
 639          * and elliptic curves we support.
 640          */
 641         int using_ecc = 0;
 642         int i;
 643         unsigned char *j;
 644         unsigned long alg_k, alg_a;
 645         STACK_OF(SSL_CIPHER) *cipher_stack = SSL_get_ciphers(s);
 646
 647         for (i = 0; i < sk_SSL_CIPHER_num(cipher_stack); i++)
 648                 {
 649                 SSL_CIPHER *c = sk_SSL_CIPHER_value(cipher_stack, i);
 650
 651                 alg_k = c->algorithm_mkey;
 652                 alg_a = c->algorithm_auth;
 653                 if ((alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe) || (alg_a & SSL_aECDSA)))
 654                         {
 655                         using_ecc = 1;
 656                         break;
 657                         }
 658                 }
 659         using_ecc = using_ecc && (s->version == TLS1_VERSION);
 660         if (using_ecc)
 661                 {
 662                 if (s->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->tlsext_ecpointformatlist);
 663                 if ((s->tlsext_ecpointformatlist = OPENSSL_malloc(3)) == NULL)
 664                         {
 665                         SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
 666                         return -1;
 667                         }
 668                 s->tlsext_ecpointformatlist_length = 3;
 669                 s->tlsext_ecpointformatlist[0] = TLSEXT_ECPOINTFORMAT_uncompressed;
 670                 s->tlsext_ecpointformatlist[1] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime;
 671                 s->tlsext_ecpointformatlist[2] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2;
 672
 673                 /* we support all named elliptic curves in draft-ietf-tls-ecc-12 */
 674                 if (s->tlsext_ellipticcurvelist != NULL) OPENSSL_free(s->tlsext_ellipticcurvelist);
 675                 s->tlsext_ellipticcurvelist_length = sizeof(nid_list)/sizeof(nid_list[0]) * 2;
 676                 if ((s->tlsext_ellipticcurvelist = OPENSSL_malloc(s->tlsext_ellipticcurvelist_length)) == NULL)
 677                         {
 678                         s->tlsext_ellipticcurvelist_length = 0;
 679                         SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
 680                         return -1;
 681                         }
 682                 for (i = 1, j = s->tlsext_ellipticcurvelist; i <= sizeof(nid_list)/sizeof(nid_list[0]); i++)
 683                         s2n(i,j);
 684                 }
 685 #endif /* OPENSSL_NO_EC */
 686         return 1;
 687         }
 688
 689 int ssl_prepare_serverhello_tlsext(SSL *s)
 690         {
 691 #ifndef OPENSSL_NO_EC
 692         /* If we are server and using an ECC cipher suite, send the point formats we support
 693          * if the client sent us an ECPointsFormat extension.  Note that the server is not
 694          * supposed to send an EllipticCurves extension.
 695          */
 696
 697         unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
 698         unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth;
 699         int using_ecc = (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) || (alg_a & SSL_aECDSA);
 700         using_ecc = using_ecc && (s->session->tlsext_ecpointformatlist != NULL);
 701
 702         if (using_ecc)
 703                 {
 704                 if (s->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->tlsext_ecpointformatlist);
 705                 if ((s->tlsext_ecpointformatlist = OPENSSL_malloc(3)) == NULL)
 706                         {
 707                         SSLerr(SSL_F_SSL_PREPARE_SERVERHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
 708                         return -1;
 709                         }
 710                 s->tlsext_ecpointformatlist_length = 3;
 711                 s->tlsext_ecpointformatlist[0] = TLSEXT_ECPOINTFORMAT_uncompressed;
 712                 s->tlsext_ecpointformatlist[1] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime;
 713                 s->tlsext_ecpointformatlist[2] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2;
 714                 }
 715 #endif /* OPENSSL_NO_EC */
 716         return 1;
 717         }
 718
 719 int ssl_check_clienthello_tlsext(SSL *s)
 720         {
 721         int ret=SSL_TLSEXT_ERR_NOACK;
 722         int al = SSL_AD_UNRECOGNIZED_NAME;
 723
 724 #ifndef OPENSSL_NO_EC
 725         /* The handling of the ECPointFormats extension is done elsewhere, namely in
 726          * ssl3_choose_cipher in s3_lib.c.
 727          */
 728         /* The handling of the EllipticCurves extension is done elsewhere, namely in
 729          * ssl3_choose_cipher in s3_lib.c.
 730          */
 731 #endif
 732
 733         if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0)
 734                 ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg);
 735         else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0)
 736                 ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg);
 737
 738         switch (ret)
 739                 {
 740                 case SSL_TLSEXT_ERR_ALERT_FATAL:
 741                         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 742                         return -1;
 743
 744                 case SSL_TLSEXT_ERR_ALERT_WARNING:
 745                         ssl3_send_alert(s,SSL3_AL_WARNING,al);
 746                         return 1;
 747
 748                 case SSL_TLSEXT_ERR_NOACK:
 749                         s->servername_done=0;
 750                         default:
 751                 return 1;
 752                 }
 753         }
 754
 755 int ssl_check_serverhello_tlsext(SSL *s)
 756         {
 757         int ret=SSL_TLSEXT_ERR_NOACK;
 758         int al = SSL_AD_UNRECOGNIZED_NAME;
 759
 760 #ifndef OPENSSL_NO_EC
 761         /* If we are client and using an elliptic curve cryptography cipher suite, then server
 762          * must return a an EC point formats lists containing uncompressed.
 763          */
 764         unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
 765         unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth;
 766         if ((s->tlsext_ecpointformatlist != NULL) && (s->tlsext_ecpointformatlist_length > 0) &&
 767             ((alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) || (alg_a & SSL_aECDSA)))
 768                 {
 769                 /* we are using an ECC cipher */
 770                 size_t i;
 771                 unsigned char *list;
 772                 int found_uncompressed = 0;
 773                 if ((s->session->tlsext_ecpointformatlist == NULL) || (s->session->tlsext_ecpointformatlist_length == 0))
 774                         {
 775                         SSLerr(SSL_F_SSL_CHECK_SERVERHELLO_TLSEXT,SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST);
 776                         return -1;
 777                         }
 778                 list = s->session->tlsext_ecpointformatlist;
 779                 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
 780                         {
 781                         if (*(list++) == TLSEXT_ECPOINTFORMAT_uncompressed)
 782                                 {
 783                                 found_uncompressed = 1;
 784                                 break;
 785                                 }
 786                         }
 787                 if (!found_uncompressed)
 788                         {
 789                         SSLerr(SSL_F_SSL_CHECK_SERVERHELLO_TLSEXT,SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST);
 790                         return -1;
 791                         }
 792                 }
 793         ret = SSL_TLSEXT_ERR_OK;
 794 #endif /* OPENSSL_NO_EC */
 795
 796         if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0)
 797                 ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg);
 798         else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0)
 799                 ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg);
 800
 801         switch (ret)
 802                 {
 803                 case SSL_TLSEXT_ERR_ALERT_FATAL:
 804                         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 805                         return -1;
 806
 807                 case SSL_TLSEXT_ERR_ALERT_WARNING:
 808                         ssl3_send_alert(s,SSL3_AL_WARNING,al);
 809                         return 1;
 810
 811                 case SSL_TLSEXT_ERR_NOACK:
 812                         s->servername_done=0;
 813                         default:
 814                 return 1;
 815                 }
 816         }
 817
 818 /* Since the server cache lookup is done early on in the processing of client
 819  * hello and other operations depend on the result we need to handle any TLS
 820  * session ticket extension at the same time.
 821  */
 822
 823 int tls1_process_ticket(SSL *s, unsigned char *session_id, int len,
 824                                 const unsigned char *limit, SSL_SESSION **ret)
 825         {
 826         /* Point after session ID in client hello */
 827         const unsigned char *p = session_id + len;
 828         unsigned short i;
 829         if ((s->version <= SSL3_VERSION) || !limit)
 830                 return 1;
 831         if (p >= limit)
 832                 return -1;
 833         /* Skip past cipher list */
 834         n2s(p, i);
 835         p+= i;
 836         if (p >= limit)
 837                 return -1;
 838         /* Skip past compression algorithm list */
 839         i = *(p++);
 840         p += i;
 841         if (p > limit)
 842                 return -1;
 843         /* Now at start of extensions */
 844         if ((p + 2) >= limit)
 845                 return 1;
 846         n2s(p, i);
 847         while ((p + 4) <= limit)
 848                 {
 849                 unsigned short type, size;
 850                 n2s(p, type);
 851                 n2s(p, size);
 852                 if (p + size > limit)
 853                         return 1;
 854                 if (type == TLSEXT_TYPE_session_ticket)
 855                         {
 856                         /* If tickets disabled indicate cache miss which will
 857                          * trigger a full handshake
 858                          */
 859                         if (SSL_get_options(s) & SSL_OP_NO_TICKET)
 860                                 return 0;
 861                         /* If zero length not client will accept a ticket
 862                          * and indicate cache miss to trigger full handshake
 863                          */
 864                         if (size == 0)
 865                                 {
 866                                 s->tlsext_ticket_expected = 1;
 867                                 return 0;       /* Cache miss */
 868                                 }
 869                         return tls_decrypt_ticket(s, p, size, session_id, len,
 870                                                                         ret);
 871                         }
 872                 p += size;
 873                 }
 874         return 1;
 875         }
 876
 877 static int tls_decrypt_ticket(SSL *s, const unsigned char *etick, int eticklen,
 878                                 const unsigned char *sess_id, int sesslen,
 879                                 SSL_SESSION **psess)
 880         {
 881         SSL_SESSION *sess;
 882         unsigned char *sdec;
 883         const unsigned char *p;
 884         int slen, mlen;
 885         unsigned char tick_hmac[EVP_MAX_MD_SIZE];
 886         HMAC_CTX hctx;
 887         EVP_CIPHER_CTX ctx;
 888         /* Attempt to process session ticket, first conduct sanity and
 889          * integrity checks on ticket.
 890          */
 891         mlen = EVP_MD_size(EVP_sha1());
 892         eticklen -= mlen;
 893         /* Need at least keyname + iv + some encrypted data */
 894         if (eticklen < 48)
 895                 goto tickerr;
 896         /* Check key name matches */
 897         if (memcmp(etick, s->ctx->tlsext_tick_key_name, 16))
 898                 goto tickerr;
 899         /* Check HMAC of encrypted ticket */
 900         HMAC_CTX_init(&hctx);
 901         HMAC_Init_ex(&hctx, s->ctx->tlsext_tick_hmac_key, 16,
 902                                 EVP_sha1(), NULL);
 903         HMAC_Update(&hctx, etick, eticklen);
 904         HMAC_Final(&hctx, tick_hmac, NULL);
 905         HMAC_CTX_cleanup(&hctx);
 906         if (memcmp(tick_hmac, etick + eticklen, mlen))
 907                 goto tickerr;
 908         /* Set p to start of IV */
 909         p = etick + 16;
 910         EVP_CIPHER_CTX_init(&ctx);
 911         /* Attempt to decrypt session data */
 912         EVP_DecryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
 913                                         s->ctx->tlsext_tick_aes_key, p);
 914         /* Move p after IV to start of encrypted ticket, update length */
 915         p += 16;
 916         eticklen -= 32;
 917         sdec = OPENSSL_malloc(eticklen);
 918         if (!sdec)
 919                 {
 920                 EVP_CIPHER_CTX_cleanup(&ctx);
 921                 return -1;
 922                 }
 923         EVP_DecryptUpdate(&ctx, sdec, &slen, p, eticklen);
 924         if (EVP_DecryptFinal(&ctx, sdec + slen, &mlen) <= 0)
 925                 goto tickerr;
 926         slen += mlen;
 927         EVP_CIPHER_CTX_cleanup(&ctx);
 928         p = sdec;
 929
 930         sess = d2i_SSL_SESSION(NULL, &p, slen);
 931         OPENSSL_free(sdec);
 932         if (sess)
 933                 {
 934                 /* The session ID if non-empty is used by some clients to
 935                  * detect that the ticket has been accepted. So we copy it to
 936                  * the session structure. If it is empty set length to zero
 937                  * as required by standard.
 938                  */
 939                 if (sesslen)
 940                         memcpy(sess->session_id, sess_id, sesslen);
 941                 sess->session_id_length = sesslen;
 942                 *psess = sess;
 943                 return 1;
 944                 }
 945         /* If session decrypt failure indicate a cache miss and set state to
 946          * send a new ticket
 947          */
 948         tickerr:
 949         s->tlsext_ticket_expected = 1;
 950         return 0;
 951         }
 952
 953 #endif
 954 #ifndef OPENSSL_NO_EC
 955 static int nid_list[] =
 956         {
 957                 NID_sect163k1, /* sect163k1 (1) */
 958                 NID_sect163r1, /* sect163r1 (2) */
 959                 NID_sect163r2, /* sect163r2 (3) */
 960                 NID_sect193r1, /* sect193r1 (4) */
 961                 NID_sect193r2, /* sect193r2 (5) */
 962                 NID_sect233k1, /* sect233k1 (6) */
 963                 NID_sect233r1, /* sect233r1 (7) */
 964                 NID_sect239k1, /* sect239k1 (8) */
 965                 NID_sect283k1, /* sect283k1 (9) */
 966                 NID_sect283r1, /* sect283r1 (10) */
 967                 NID_sect409k1, /* sect409k1 (11) */
 968                 NID_sect409r1, /* sect409r1 (12) */
 969                 NID_sect571k1, /* sect571k1 (13) */
 970                 NID_sect571r1, /* sect571r1 (14) */
 971                 NID_secp160k1, /* secp160k1 (15) */
 972                 NID_secp160r1, /* secp160r1 (16) */
 973                 NID_secp160r2, /* secp160r2 (17) */
 974                 NID_secp192k1, /* secp192k1 (18) */
 975                 NID_X9_62_prime192v1, /* secp192r1 (19) */
 976                 NID_secp224k1, /* secp224k1 (20) */
 977                 NID_secp224r1, /* secp224r1 (21) */
 978                 NID_secp256k1, /* secp256k1 (22) */
 979                 NID_X9_62_prime256v1, /* secp256r1 (23) */
 980                 NID_secp384r1, /* secp384r1 (24) */
 981                 NID_secp521r1  /* secp521r1 (25) */
 982         };
 983
 984 int tls1_ec_curve_id2nid(int curve_id)
 985         {
 986         /* ECC curves from draft-ietf-tls-ecc-12.txt (Oct. 17, 2005) */
 987         if ((curve_id < 1) || (curve_id > sizeof(nid_list)/sizeof(nid_list[0]))) return 0;
 988         return nid_list[curve_id-1];
 989         }
 990
 991 int tls1_ec_nid2curve_id(int nid)
 992         {
 993         /* ECC curves from draft-ietf-tls-ecc-12.txt (Oct. 17, 2005) */
 994         switch (nid)
 995                 {
 996         case NID_sect163k1: /* sect163k1 (1) */
 997                 return 1;
 998         case NID_sect163r1: /* sect163r1 (2) */
 999                 return 2;
1000         case NID_sect163r2: /* sect163r2 (3) */
1001                 return 3;
1002         case NID_sect193r1: /* sect193r1 (4) */
1003                 return 4;
1004         case NID_sect193r2: /* sect193r2 (5) */
1005                 return 5;
1006         case NID_sect233k1: /* sect233k1 (6) */
1007                 return 6;
1008         case NID_sect233r1: /* sect233r1 (7) */
1009                 return 7;
1010         case NID_sect239k1: /* sect239k1 (8) */
1011                 return 8;
1012         case NID_sect283k1: /* sect283k1 (9) */
1013                 return 9;
1014         case NID_sect283r1: /* sect283r1 (10) */
1015                 return 10;
1016         case NID_sect409k1: /* sect409k1 (11) */
1017                 return 11;
1018         case NID_sect409r1: /* sect409r1 (12) */
1019                 return 12;
1020         case NID_sect571k1: /* sect571k1 (13) */
1021                 return 13;
1022         case NID_sect571r1: /* sect571r1 (14) */
1023                 return 14;
1024         case NID_secp160k1: /* secp160k1 (15) */
1025                 return 15;
1026         case NID_secp160r1: /* secp160r1 (16) */
1027                 return 16;
1028         case NID_secp160r2: /* secp160r2 (17) */
1029                 return 17;
1030         case NID_secp192k1: /* secp192k1 (18) */
1031                 return 18;
1032         case NID_X9_62_prime192v1: /* secp192r1 (19) */
1033                 return 19;
1034         case NID_secp224k1: /* secp224k1 (20) */
1035                 return 20;
1036         case NID_secp224r1: /* secp224r1 (21) */
1037                 return 21;
1038         case NID_secp256k1: /* secp256k1 (22) */
1039                 return 22;
1040         case NID_X9_62_prime256v1: /* secp256r1 (23) */
1041                 return 23;
1042         case NID_secp384r1: /* secp384r1 (24) */
1043                 return 24;
1044         case NID_secp521r1:  /* secp521r1 (25) */
1045                 return 25;
1046         default:
1047                 return 0;
1048                 }
1049         }
1050 #endif /* OPENSSL_NO_EC */