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