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) 1998-2006 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 "ssl_locl.h"
 115
 116 const char *tls1_version_str="TLSv1" OPENSSL_VERSION_PTEXT;
 117
 118 SSL3_ENC_METHOD TLSv1_enc_data={
 119         tls1_enc,
 120         tls1_mac,
 121         tls1_setup_key_block,
 122         tls1_generate_master_secret,
 123         tls1_change_cipher_state,
 124         tls1_final_finish_mac,
 125         TLS1_FINISH_MAC_LENGTH,
 126         tls1_cert_verify_mac,
 127         TLS_MD_CLIENT_FINISH_CONST,TLS_MD_CLIENT_FINISH_CONST_SIZE,
 128         TLS_MD_SERVER_FINISH_CONST,TLS_MD_SERVER_FINISH_CONST_SIZE,
 129         tls1_alert_code,
 130         };
 131
 132 long tls1_default_timeout(void)
 133         {
 134         /* 2 hours, the 24 hours mentioned in the TLSv1 spec
 135          * is way too long for http, the cache would over fill */
 136         return(60*60*2);
 137         }
 138
 139 int tls1_new(SSL *s)
 140         {
 141         if (!ssl3_new(s)) return(0);
 142         s->method->ssl_clear(s);
 143         return(1);
 144         }
 145
 146 void tls1_free(SSL *s)
 147         {
 148         ssl3_free(s);
 149         }
 150
 151 void tls1_clear(SSL *s)
 152         {
 153         ssl3_clear(s);
 154         s->version=TLS1_VERSION;
 155         }
 156
 157
 158 #ifndef OPENSSL_NO_TLSEXT
 159 unsigned char *ssl_add_clienthello_tlsext(SSL *s, unsigned char *p, unsigned char *limit)
 160         {
 161         int extdatalen=0;
 162         unsigned char *ret = p;
 163
 164         ret+=2;
 165
 166         if (ret>=limit) return NULL; /* this really never occurs, but ... */
 167         if (s->tlsext_hostname != NULL)
 168                 {
 169                 /* Add TLS extension servername to the Client Hello message */
 170                 unsigned long size_str;
 171                 long lenmax;
 172
 173                 /* check for enough space.
 174                    4 for the servername type and entension length
 175                    2 for servernamelist length
 176                    1 for the hostname type
 177                    2 for hostname length
 178                    + hostname length
 179                 */
 180
 181                 if ((lenmax = limit - p - 9) < 0
 182                 || (size_str = strlen(s->tlsext_hostname)) > (unsigned long)lenmax)
 183                         return NULL;
 184
 185                 /* extension type and length */
 186                 s2n(TLSEXT_TYPE_server_name,ret);
 187                 s2n(size_str+5,ret);
 188
 189                 /* length of servername list */
 190                 s2n(size_str+3,ret);
 191
 192                 /* hostname type, length and hostname */
 193                 *(ret++) = (unsigned char) TLSEXT_NAMETYPE_host_name;
 194                 s2n(size_str,ret);
 195                 memcpy(ret, s->tlsext_hostname, size_str);
 196                 ret+=size_str;
 197
 198                 }
 199 #ifndef OPENSSL_NO_EC
 200         if (s->tlsext_ecpointformatlist != NULL)
 201                 {
 202                 /* Add TLS extension ECPointFormats to the ClientHello message */
 203                 long lenmax;
 204
 205                 if ((lenmax = limit - p - 5) < 0) return NULL;
 206                 if (s->tlsext_ecpointformatlist_length > (unsigned long)lenmax) return NULL;
 207                 if (s->tlsext_ecpointformatlist_length > 255)
 208                         {
 209                         SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
 210                         return NULL;
 211                         }
 212
 213                 s2n(TLSEXT_TYPE_ec_point_formats,ret);
 214                 s2n(s->tlsext_ecpointformatlist_length + 1,ret);
 215                 *(ret++) = (unsigned char) s->tlsext_ecpointformatlist_length;
 216                 memcpy(ret, s->tlsext_ecpointformatlist, s->tlsext_ecpointformatlist_length);
 217                 ret+=s->tlsext_ecpointformatlist_length;
 218                 }
 219         if (s->tlsext_ellipticcurvelist != NULL)
 220                 {
 221                 /* Add TLS extension EllipticCurves to the ClientHello message */
 222                 long lenmax;
 223
 224                 if ((lenmax = limit - p - 5) < 0) return NULL;
 225                 if (s->tlsext_ellipticcurvelist_length > (unsigned long)lenmax) return NULL;
 226                 if (s->tlsext_ellipticcurvelist_length > 255)
 227                         {
 228                         SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
 229                         return NULL;
 230                         }
 231
 232                 s2n(TLSEXT_TYPE_elliptic_curves,ret);
 233                 s2n(s->tlsext_ellipticcurvelist_length + 2,ret);
 234                 *(ret++) = (unsigned char) ((s->tlsext_ellipticcurvelist_length >> 8) & 0xFF);
 235                 *(ret++) = (unsigned char) (s->tlsext_ellipticcurvelist_length & 0xFF);
 236                 memcpy(ret, s->tlsext_ellipticcurvelist, s->tlsext_ellipticcurvelist_length);
 237                 ret+=s->tlsext_ellipticcurvelist_length;
 238                 }
 239 #endif /* OPENSSL_NO_EC */
 240
 241         if ((extdatalen = ret-p-2)== 0)
 242                 return p;
 243
 244         s2n(extdatalen,p);
 245         return ret;
 246 }
 247
 248 unsigned char *ssl_add_serverhello_tlsext(SSL *s, unsigned char *p, unsigned char *limit)
 249         {
 250         int extdatalen=0;
 251         unsigned char *ret = p;
 252
 253         ret+=2;
 254         if (ret>=limit) return NULL; /* this really never occurs, but ... */
 255
 256         if (!s->hit && s->servername_done == 1 && s->session->tlsext_hostname != NULL)
 257                 {
 258                 if (limit - p - 4 < 0) return NULL;
 259
 260                 s2n(TLSEXT_TYPE_server_name,ret);
 261                 s2n(0,ret);
 262                 }
 263 #ifndef OPENSSL_NO_EC
 264         if (s->tlsext_ecpointformatlist != NULL)
 265                 {
 266                 /* Add TLS extension ECPointFormats to the ServerHello message */
 267                 long lenmax;
 268
 269                 if ((lenmax = limit - p - 5) < 0) return NULL;
 270                 if (s->tlsext_ecpointformatlist_length > (unsigned long)lenmax) return NULL;
 271                 if (s->tlsext_ecpointformatlist_length > 255)
 272                         {
 273                         SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
 274                         return NULL;
 275                         }
 276
 277                 s2n(TLSEXT_TYPE_ec_point_formats,ret);
 278                 s2n(s->tlsext_ecpointformatlist_length + 1,ret);
 279                 *(ret++) = (unsigned char) s->tlsext_ecpointformatlist_length;
 280                 memcpy(ret, s->tlsext_ecpointformatlist, s->tlsext_ecpointformatlist_length);
 281                 ret+=s->tlsext_ecpointformatlist_length;
 282
 283                 }
 284         /* Currently the server should not respond with a SupportedCurves extension */
 285 #endif /* OPENSSL_NO_EC */
 286
 287         if ((extdatalen = ret-p-2)== 0)
 288                 return p;
 289
 290         s2n(extdatalen,p);
 291         return ret;
 292 }
 293
 294 int ssl_parse_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al)
 295         {
 296         unsigned short type;
 297         unsigned short size;
 298         unsigned short len;
 299         unsigned char *data = *p;
 300         s->servername_done = 0;
 301
 302         if (data >= (d+n-2))
 303                 return 1;
 304         n2s(data,len);
 305
 306         if (data > (d+n-len))
 307                 return 1;
 308
 309         while (data <= (d+n-4))
 310                 {
 311                 n2s(data,type);
 312                 n2s(data,size);
 313
 314                 if (data+size > (d+n))
 315                         return 1;
 316
 317 /* The servername extension is treated as follows:
 318
 319    - Only the hostname type is supported with a maximum length of 255.
 320    - The servername is rejected if too long or if it contains zeros,
 321      in which case an fatal alert is generated.
 322    - The servername field is maintained together with the session cache.
 323    - When a session is resumed, the servername call back invoked in order
 324      to allow the application to position itself to the right context.
 325    - The servername is acknowledged if it is new for a session or when
 326      it is identical to a previously used for the same session.
 327      Applications can control the behaviour.  They can at any time
 328      set a 'desirable' servername for a new SSL object. This can be the
 329      case for example with HTTPS when a Host: header field is received and
 330      a renegotiation is requested. In this case, a possible servername
 331      presented in the new client hello is only acknowledged if it matches
 332      the value of the Host: field.
 333    - Applications must  use SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
 334      if they provide for changing an explicit servername context for the session,
 335      i.e. when the session has been established with a servername extension.
 336    - On session reconnect, the servername extension may be absent.
 337
 338 */
 339
 340                 if (type == TLSEXT_TYPE_server_name)
 341                         {
 342                         unsigned char *sdata;
 343                         int servname_type;
 344                         int dsize;
 345
 346                         if (size < 2)
 347                                 {
 348                                 *al = SSL_AD_DECODE_ERROR;
 349                                 return 0;
 350                                 }
 351                         n2s(data,dsize);
 352                         size -= 2;
 353                         if (dsize > size  )
 354                                 {
 355                                 *al = SSL_AD_DECODE_ERROR;
 356                                 return 0;
 357                                 }
 358
 359                         sdata = data;
 360                         while (dsize > 3)
 361                                 {
 362                                 servname_type = *(sdata++);
 363                                 n2s(sdata,len);
 364                                 dsize -= 3;
 365
 366                                 if (len > dsize)
 367                                         {
 368                                         *al = SSL_AD_DECODE_ERROR;
 369                                         return 0;
 370                                         }
 371                                 if (s->servername_done == 0)
 372                                 switch (servname_type)
 373                                         {
 374                                 case TLSEXT_NAMETYPE_host_name:
 375                                         if (s->session->tlsext_hostname == NULL)
 376                                                 {
 377                                                 if (len > TLSEXT_MAXLEN_host_name ||
 378                                                         ((s->session->tlsext_hostname = OPENSSL_malloc(len+1)) == NULL))
 379                                                         {
 380                                                         *al = TLS1_AD_UNRECOGNIZED_NAME;
 381                                                         return 0;
 382                                                         }
 383                                                 memcpy(s->session->tlsext_hostname, sdata, len);
 384                                                 s->session->tlsext_hostname[len]='\0';
 385                                                 if (strlen(s->session->tlsext_hostname) != len) {
 386                                                         OPENSSL_free(s->session->tlsext_hostname);
 387                                                         *al = TLS1_AD_UNRECOGNIZED_NAME;
 388                                                         return 0;
 389                                                 }
 390                                                 s->servername_done = 1;
 391
 392                                                 }
 393                                         else
 394                                                 s->servername_done = strlen(s->session->tlsext_hostname) == len
 395                                                         && strncmp(s->session->tlsext_hostname, (char *)sdata, len) == 0;
 396
 397                                         break;
 398
 399                                 default:
 400                                         break;
 401                                         }
 402
 403                                 dsize -= len;
 404                                 }
 405                         if (dsize != 0)
 406                                 {
 407                                 *al = SSL_AD_DECODE_ERROR;
 408                                 return 0;
 409                                 }
 410
 411                         }
 412
 413 #ifndef OPENSSL_NO_EC
 414                 else if (type == TLSEXT_TYPE_ec_point_formats)
 415                         {
 416                         unsigned char *sdata = data;
 417                         int ecpointformatlist_length = *(sdata++);
 418
 419                         if (ecpointformatlist_length != size - 1)
 420                                 {
 421                                 *al = TLS1_AD_DECODE_ERROR;
 422                                 return 0;
 423                                 }
 424                         s->session->tlsext_ecpointformatlist_length = 0;
 425                         if (s->session->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->session->tlsext_ecpointformatlist);
 426                         if ((s->session->tlsext_ecpointformatlist = OPENSSL_malloc(ecpointformatlist_length)) == NULL)
 427                                 {
 428                                 *al = TLS1_AD_INTERNAL_ERROR;
 429                                 return 0;
 430                                 }
 431                         s->session->tlsext_ecpointformatlist_length = ecpointformatlist_length;
 432                         memcpy(s->session->tlsext_ecpointformatlist, sdata, ecpointformatlist_length);
 433 #if 0
 434                         fprintf(stderr,"ssl_parse_clienthello_tlsext s->session->tlsext_ecpointformatlist (length=%i) ", s->session->tlsext_ecpointformatlist_length);
 435                         sdata = s->session->tlsext_ecpointformatlist;
 436                         for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
 437                                 fprintf(stderr,"%i ",*(sdata++));
 438                         fprintf(stderr,"\n");
 439 #endif
 440                         }
 441                 else if (type == TLSEXT_TYPE_elliptic_curves)
 442                         {
 443                         unsigned char *sdata = data;
 444                         int ellipticcurvelist_length = (*(sdata++) << 8);
 445                         ellipticcurvelist_length += (*(sdata++));
 446
 447                         if (ellipticcurvelist_length != size - 2)
 448                                 {
 449                                 *al = TLS1_AD_DECODE_ERROR;
 450                                 return 0;
 451                                 }
 452                         s->session->tlsext_ellipticcurvelist_length = 0;
 453                         if (s->session->tlsext_ellipticcurvelist != NULL) OPENSSL_free(s->session->tlsext_ellipticcurvelist);
 454                         if ((s->session->tlsext_ellipticcurvelist = OPENSSL_malloc(ellipticcurvelist_length)) == NULL)
 455                                 {
 456                                 *al = TLS1_AD_INTERNAL_ERROR;
 457                                 return 0;
 458                                 }
 459                         s->session->tlsext_ellipticcurvelist_length = ellipticcurvelist_length;
 460                         memcpy(s->session->tlsext_ellipticcurvelist, sdata, ellipticcurvelist_length);
 461 #if 0
 462                         fprintf(stderr,"ssl_parse_clienthello_tlsext s->session->tlsext_ellipticcurvelist (length=%i) ", s->session->tlsext_ellipticcurvelist_length);
 463                         sdata = s->session->tlsext_ellipticcurvelist;
 464                         for (i = 0; i < s->session->tlsext_ellipticcurvelist_length; i++)
 465                                 fprintf(stderr,"%i ",*(sdata++));
 466                         fprintf(stderr,"\n");
 467 #endif
 468                         }
 469 #endif /* OPENSSL_NO_EC */
 470                 data+=size;
 471                 }
 472
 473         *p = data;
 474         return 1;
 475 }
 476
 477 int ssl_parse_serverhello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al)
 478         {
 479         unsigned short type;
 480         unsigned short size;
 481         unsigned short len;
 482         unsigned char *data = *p;
 483
 484         int tlsext_servername = 0;
 485
 486         if (data >= (d+n-2))
 487                 return 1;
 488
 489         n2s(data,len);
 490
 491         while(data <= (d+n-4))
 492                 {
 493                 n2s(data,type);
 494                 n2s(data,size);
 495
 496                 if (data+size > (d+n))
 497                         return 1;
 498
 499                 if (type == TLSEXT_TYPE_server_name)
 500                         {
 501                         if (s->tlsext_hostname == NULL || size > 0)
 502                                 {
 503                                 *al = TLS1_AD_UNRECOGNIZED_NAME;
 504                                 return 0;
 505                                 }
 506                         tlsext_servername = 1;
 507                         }
 508
 509 #ifndef OPENSSL_NO_EC
 510                 else if (type == TLSEXT_TYPE_ec_point_formats)
 511                         {
 512                         unsigned char *sdata = data;
 513                         int ecpointformatlist_length = *(sdata++);
 514
 515                         if (ecpointformatlist_length != size - 1)
 516                                 {
 517                                 *al = TLS1_AD_DECODE_ERROR;
 518                                 return 0;
 519                                 }
 520                         s->session->tlsext_ecpointformatlist_length = 0;
 521                         if (s->session->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->session->tlsext_ecpointformatlist);
 522                         if ((s->session->tlsext_ecpointformatlist = OPENSSL_malloc(ecpointformatlist_length)) == NULL)
 523                                 {
 524                                 *al = TLS1_AD_INTERNAL_ERROR;
 525                                 return 0;
 526                                 }
 527                         s->session->tlsext_ecpointformatlist_length = ecpointformatlist_length;
 528                         memcpy(s->session->tlsext_ecpointformatlist, sdata, ecpointformatlist_length);
 529 #if 0
 530                         fprintf(stderr,"ssl_parse_serverhello_tlsext s->session->tlsext_ecpointformatlist ");
 531                         sdata = s->session->tlsext_ecpointformatlist;
 532                         for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
 533                                 fprintf(stderr,"%i ",*(sdata++));
 534                         fprintf(stderr,"\n");
 535 #endif
 536                         }
 537 #endif /* OPENSSL_NO_EC */
 538                 data+=size;
 539                 }
 540
 541         if (data != d+n)
 542                 {
 543                 *al = SSL_AD_DECODE_ERROR;
 544                 return 0;
 545                 }
 546
 547         if (!s->hit && tlsext_servername == 1)
 548                 {
 549                 if (s->tlsext_hostname)
 550                         {
 551                         if (s->session->tlsext_hostname == NULL)
 552                                 {
 553                                 s->session->tlsext_hostname = BUF_strdup(s->tlsext_hostname);
 554                                 if (!s->session->tlsext_hostname)
 555                                         {
 556                                         *al = SSL_AD_UNRECOGNIZED_NAME;
 557                                         return 0;
 558                                         }
 559                                 }
 560                         else
 561                                 {
 562                                 *al = SSL_AD_DECODE_ERROR;
 563                                 return 0;
 564                                 }
 565                         }
 566                 }
 567
 568         *p = data;
 569         return 1;
 570 }
 571
 572 int ssl_prepare_clienthello_tlsext(SSL *s)
 573         {
 574 #ifndef OPENSSL_NO_EC
 575         /* If we are client and using an elliptic curve cryptography cipher suite, send the point formats
 576          * and elliptic curves we support.
 577          */
 578         int using_ecc = 0;
 579         int i;
 580         unsigned char *j;
 581         int algs;
 582         STACK_OF(SSL_CIPHER) *cipher_stack = SSL_get_ciphers(s);
 583         for (i = 0; i < sk_SSL_CIPHER_num(cipher_stack); i++)
 584                 {
 585                 algs = (sk_SSL_CIPHER_value(cipher_stack, i))->algorithms;
 586                 if ((algs & SSL_kECDH) || (algs & SSL_kECDHE) || (algs & SSL_aECDSA))
 587                         {
 588                         using_ecc = 1;
 589                         break;
 590                         }
 591
 592                 }
 593         using_ecc = using_ecc && (s->version == TLS1_VERSION);
 594         if (using_ecc)
 595                 {
 596                 if (s->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->tlsext_ecpointformatlist);
 597                 if ((s->tlsext_ecpointformatlist = OPENSSL_malloc(3)) == NULL)
 598                         {
 599                         SSLerr(SSL_F_TLS1_PREPARE_CLIENTHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
 600                         return -1;
 601                         }
 602                 s->tlsext_ecpointformatlist_length = 3;
 603                 s->tlsext_ecpointformatlist[0] = TLSEXT_ECPOINTFORMAT_uncompressed;
 604                 s->tlsext_ecpointformatlist[1] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime;
 605                 s->tlsext_ecpointformatlist[2] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2;
 606                 /* we support all named elliptic curves in draft-ietf-tls-ecc-12 */
 607                 if (s->tlsext_ellipticcurvelist != NULL) OPENSSL_free(s->tlsext_ellipticcurvelist);
 608                 if ((s->tlsext_ellipticcurvelist = OPENSSL_malloc(50)) == NULL)
 609                         {
 610                         SSLerr(SSL_F_TLS1_PREPARE_CLIENTHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
 611                         return -1;
 612                         }
 613                 s->tlsext_ellipticcurvelist_length = 50;
 614                 for (i = 1, j = s->tlsext_ellipticcurvelist; i <= 25; i++)
 615                         {
 616                         *(j++) = 0x00;
 617                         *(j++) = i;
 618                         }
 619                 }
 620 #endif /* OPENSSL_NO_EC */
 621         return 1;
 622 }
 623
 624 int ssl_prepare_serverhello_tlsext(SSL *s)
 625         {
 626 #ifndef OPENSSL_NO_EC
 627         /* If we are server and using an ECC cipher suite, send the point formats we support
 628          * if the client sent us an ECPointsFormat extension.  Note that the server is not
 629          * supposed to send an EllipticCurves extension.
 630          */
 631         int algs = s->s3->tmp.new_cipher->algorithms;
 632         int using_ecc = (algs & SSL_kECDH) || (algs & SSL_kECDHE) || (algs & SSL_aECDSA);
 633         using_ecc = using_ecc && (s->session->tlsext_ecpointformatlist != NULL);
 634
 635         if (using_ecc)
 636                 {
 637                 if (s->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->tlsext_ecpointformatlist);
 638                 if ((s->tlsext_ecpointformatlist = OPENSSL_malloc(3)) == NULL)
 639                         {
 640                         SSLerr(SSL_F_TLS1_PREPARE_SERVERHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
 641                         return -1;
 642                         }
 643                 s->tlsext_ecpointformatlist_length = 3;
 644                 s->tlsext_ecpointformatlist[0] = TLSEXT_ECPOINTFORMAT_uncompressed;
 645                 s->tlsext_ecpointformatlist[1] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime;
 646                 s->tlsext_ecpointformatlist[2] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2;
 647                 }
 648 #endif /* OPENSSL_NO_EC */
 649         return 1;
 650 }
 651
 652 int ssl_check_clienthello_tlsext(SSL *s)
 653         {
 654         int ret=SSL_TLSEXT_ERR_NOACK;
 655         int al = SSL_AD_UNRECOGNIZED_NAME;
 656
 657 #ifndef OPENSSL_NO_EC
 658         /* The handling of the ECPointFormats extension is done elsewhere, namely in
 659          * ssl3_choose_cipher in s3_lib.c.
 660          */
 661         /* The handling of the EllipticCurves extension is done elsewhere, namely in
 662          * ssl3_choose_cipher in s3_lib.c.
 663          */
 664 #endif
 665
 666         if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0)
 667                 ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg);
 668         else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0)
 669                 ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg);
 670
 671         switch (ret) {
 672                 case SSL_TLSEXT_ERR_ALERT_FATAL:
 673                         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 674                         return -1;
 675
 676                 case SSL_TLSEXT_ERR_ALERT_WARNING:
 677                         ssl3_send_alert(s,SSL3_AL_WARNING,al);
 678                         return 1;
 679
 680                 case SSL_TLSEXT_ERR_NOACK:
 681                         s->servername_done=0;
 682                         default:
 683                 return 1;
 684         }
 685 }
 686
 687 int ssl_check_serverhello_tlsext(SSL *s)
 688         {
 689         int ret=SSL_TLSEXT_ERR_NOACK;
 690         int al = SSL_AD_UNRECOGNIZED_NAME;
 691
 692 #ifndef OPENSSL_NO_EC
 693         /* If we are client and using an elliptic curve cryptography cipher suite, then server
 694          * must return a an EC point formats lists containing uncompressed.
 695          */
 696         int algs = s->s3->tmp.new_cipher->algorithms;
 697         if ((s->tlsext_ecpointformatlist != NULL) && (s->tlsext_ecpointformatlist_length > 0) &&
 698             ((algs & SSL_kECDH) || (algs & SSL_kECDHE) || (algs & SSL_aECDSA)))
 699                 {
 700                 /* we are using an ECC cipher */
 701                 size_t i;
 702                 unsigned char *list;
 703                 int found_uncompressed = 0;
 704                 if ((s->session->tlsext_ecpointformatlist == NULL) || (s->session->tlsext_ecpointformatlist_length == 0))
 705                         {
 706                         SSLerr(SSL_F_TLS1_CHECK_SERVERHELLO_TLSEXT,SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST);
 707                         return -1;
 708                         }
 709                 list = s->session->tlsext_ecpointformatlist;
 710                 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
 711                         {
 712                         if (*(list++) == TLSEXT_ECPOINTFORMAT_uncompressed)
 713                                 {
 714                                 found_uncompressed = 1;
 715                                 break;
 716                                 }
 717                         }
 718                 if (!found_uncompressed)
 719                         {
 720                         SSLerr(SSL_F_TLS1_CHECK_SERVERHELLO_TLSEXT,SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST);
 721                         return -1;
 722                         }
 723                 }
 724         ret = SSL_TLSEXT_ERR_OK;
 725 #endif /* OPENSSL_NO_EC */
 726
 727         if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0)
 728                 ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg);
 729         else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0)
 730                 ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg);
 731
 732         switch (ret) {
 733                 case SSL_TLSEXT_ERR_ALERT_FATAL:
 734                         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 735                         return -1;
 736
 737                 case SSL_TLSEXT_ERR_ALERT_WARNING:
 738                         ssl3_send_alert(s,SSL3_AL_WARNING,al);
 739                         return 1;
 740
 741                 case SSL_TLSEXT_ERR_NOACK:
 742                         s->servername_done=0;
 743                         default:
 744                 return 1;
 745         }
 746 }
 747 #endif
 748
 749 #ifndef OPENSSL_NO_EC
 750 int tls1_ec_curve_id2nid(int curve_id)
 751 {
 752         /* ECC curves from draft-ietf-tls-ecc-12.txt (Oct. 17, 2005) */
 753         static int nid_list[26] =
 754         {
 755                 0,
 756                 NID_sect163k1, /* sect163k1 (1) */
 757                 NID_sect163r1, /* sect163r1 (2) */
 758                 NID_sect163r2, /* sect163r2 (3) */
 759                 NID_sect193r1, /* sect193r1 (4) */
 760                 NID_sect193r2, /* sect193r2 (5) */
 761                 NID_sect233k1, /* sect233k1 (6) */
 762                 NID_sect233r1, /* sect233r1 (7) */
 763                 NID_sect239k1, /* sect239k1 (8) */
 764                 NID_sect283k1, /* sect283k1 (9) */
 765                 NID_sect283r1, /* sect283r1 (10) */
 766                 NID_sect409k1, /* sect409k1 (11) */
 767                 NID_sect409r1, /* sect409r1 (12) */
 768                 NID_sect571k1, /* sect571k1 (13) */
 769                 NID_sect571r1, /* sect571r1 (14) */
 770                 NID_secp160k1, /* secp160k1 (15) */
 771                 NID_secp160r1, /* secp160r1 (16) */
 772                 NID_secp160r2, /* secp160r2 (17) */
 773                 NID_secp192k1, /* secp192k1 (18) */
 774                 NID_X9_62_prime192v1, /* secp192r1 (19) */
 775                 NID_secp224k1, /* secp224k1 (20) */
 776                 NID_secp224r1, /* secp224r1 (21) */
 777                 NID_secp256k1, /* secp256k1 (22) */
 778                 NID_X9_62_prime256v1, /* secp256r1 (23) */
 779                 NID_secp384r1, /* secp384r1 (24) */
 780                 NID_secp521r1  /* secp521r1 (25) */
 781         };
 782
 783         if ((curve_id < 1) || (curve_id > 25)) return 0;
 784
 785         return nid_list[curve_id];
 786 }
 787
 788 int tls1_ec_nid2curve_id(int nid)
 789 {
 790         /* ECC curves from draft-ietf-tls-ecc-12.txt (Oct. 17, 2005) */
 791         switch (nid) {
 792         case NID_sect163k1: /* sect163k1 (1) */
 793                 return 1;
 794         case NID_sect163r1: /* sect163r1 (2) */
 795                 return 2;
 796         case NID_sect163r2: /* sect163r2 (3) */
 797                 return 3;
 798         case NID_sect193r1: /* sect193r1 (4) */
 799                 return 4;
 800         case NID_sect193r2: /* sect193r2 (5) */
 801                 return 5;
 802         case NID_sect233k1: /* sect233k1 (6) */
 803                 return 6;
 804         case NID_sect233r1: /* sect233r1 (7) */
 805                 return 7;
 806         case NID_sect239k1: /* sect239k1 (8) */
 807                 return 8;
 808         case NID_sect283k1: /* sect283k1 (9) */
 809                 return 9;
 810         case NID_sect283r1: /* sect283r1 (10) */
 811                 return 10;
 812         case NID_sect409k1: /* sect409k1 (11) */
 813                 return 11;
 814         case NID_sect409r1: /* sect409r1 (12) */
 815                 return 12;
 816         case NID_sect571k1: /* sect571k1 (13) */
 817                 return 13;
 818         case NID_sect571r1: /* sect571r1 (14) */
 819                 return 14;
 820         case NID_secp160k1: /* secp160k1 (15) */
 821                 return 15;
 822         case NID_secp160r1: /* secp160r1 (16) */
 823                 return 16;
 824         case NID_secp160r2: /* secp160r2 (17) */
 825                 return 17;
 826         case NID_secp192k1: /* secp192k1 (18) */
 827                 return 18;
 828         case NID_X9_62_prime192v1: /* secp192r1 (19) */
 829                 return 19;
 830         case NID_secp224k1: /* secp224k1 (20) */
 831                 return 20;
 832         case NID_secp224r1: /* secp224r1 (21) */
 833                 return 21;
 834         case NID_secp256k1: /* secp256k1 (22) */
 835                 return 22;
 836         case NID_X9_62_prime256v1: /* secp256r1 (23) */
 837                 return 23;
 838         case NID_secp384r1: /* secp384r1 (24) */
 839                 return 24;
 840         case NID_secp521r1:  /* secp521r1 (25) */
 841                 return 25;
 842         default:
 843                 return 0;
 844         }
 845 }
 846 #endif /* OPENSSL_NO_EC */