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