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->servername_done == 0 && 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                 if ((lenmax = limit - p - 7) < 0) return NULL;
 174                 if ((size_str = strlen(s->tlsext_hostname)) > (unsigned long)lenmax) return NULL;
 175
 176                 s2n(TLSEXT_TYPE_server_name,ret);
 177                 s2n(size_str+3,ret);
 178                 *(ret++) = (unsigned char) TLSEXT_NAMETYPE_host_name;
 179                 s2n(size_str,ret);
 180
 181                 memcpy(ret, s->tlsext_hostname, size_str);
 182                 ret+=size_str;
 183                 }
 184 #ifndef OPENSSL_NO_EC
 185         if (s->tlsext_ecpointformatlist != NULL)
 186                 {
 187                 /* Add TLS extension ECPointFormats to the ClientHello message */
 188                 long lenmax;
 189
 190                 if ((lenmax = limit - p - 5) < 0) return NULL;
 191                 if (s->tlsext_ecpointformatlist_length > (unsigned long)lenmax) return NULL;
 192                 if (s->tlsext_ecpointformatlist_length > 255)
 193                         {
 194                         SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
 195                         return NULL;
 196                         }
 197
 198                 s2n(TLSEXT_TYPE_ec_point_formats,ret);
 199                 s2n(s->tlsext_ecpointformatlist_length + 1,ret);
 200                 *(ret++) = (unsigned char) s->tlsext_ecpointformatlist_length;
 201                 memcpy(ret, s->tlsext_ecpointformatlist, s->tlsext_ecpointformatlist_length);
 202                 ret+=s->tlsext_ecpointformatlist_length;
 203                 }
 204 #endif /* OPENSSL_NO_EC */
 205
 206         if ((extdatalen = ret-p-2)== 0)
 207                 return p;
 208
 209         s2n(extdatalen,p);
 210         return ret;
 211 }
 212
 213 unsigned char *ssl_add_serverhello_tlsext(SSL *s, unsigned char *p, unsigned char *limit)
 214         {
 215         int extdatalen=0;
 216         unsigned char *ret = p;
 217
 218         ret+=2;
 219         if (ret>=limit) return NULL; /* this really never occurs, but ... */
 220
 221         if (!s->hit && s->servername_done == 1 && s->session->tlsext_hostname != NULL)
 222                 {
 223                 if (limit - p - 4 < 0) return NULL;
 224
 225                 s2n(TLSEXT_TYPE_server_name,ret);
 226                 s2n(0,ret);
 227                 }
 228 #ifndef OPENSSL_NO_EC
 229         if (s->tlsext_ecpointformatlist != NULL)
 230                 {
 231                 /* Add TLS extension ECPointFormats to the ServerHello message */
 232                 long lenmax;
 233
 234                 if ((lenmax = limit - p - 5) < 0) return NULL;
 235                 if (s->tlsext_ecpointformatlist_length > (unsigned long)lenmax) return NULL;
 236                 if (s->tlsext_ecpointformatlist_length > 255)
 237                         {
 238                         SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
 239                         return NULL;
 240                         }
 241
 242                 s2n(TLSEXT_TYPE_ec_point_formats,ret);
 243                 s2n(s->tlsext_ecpointformatlist_length + 1,ret);
 244                 *(ret++) = (unsigned char) s->tlsext_ecpointformatlist_length;
 245                 memcpy(ret, s->tlsext_ecpointformatlist, s->tlsext_ecpointformatlist_length);
 246                 ret+=s->tlsext_ecpointformatlist_length;
 247                 }
 248 #endif /* OPENSSL_NO_EC */
 249
 250         if ((extdatalen = ret-p-2)== 0)
 251                 return p;
 252
 253         s2n(extdatalen,p);
 254         return ret;
 255 }
 256
 257 int ssl_parse_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al)
 258         {
 259         unsigned short type;
 260         unsigned short size;
 261         unsigned short len;
 262         unsigned char *data = *p;
 263 #if 0
 264         fprintf(stderr,"ssl_parse_clienthello_tlsext %s\n",s->session->tlsext_hostname?s->session->tlsext_hostname:"NULL");
 265 #endif
 266         s->servername_done = 0;
 267
 268         if (data >= (d+n-2))
 269                 return 1;
 270         n2s(data,len);
 271
 272         if (data > (d+n-len))
 273                 return 1;
 274
 275         while (data <= (d+n-4))
 276                 {
 277                 n2s(data,type);
 278                 n2s(data,size);
 279
 280                 if (data+size > (d+n))
 281                         return 1;
 282
 283 /* The servername extension is treated as follows:
 284
 285    - Only the hostname type is supported with a maximum length of 255.
 286    - The servername is rejected if too long or if it contains zeros,
 287      in which case an fatal alert is generated.
 288    - The servername field is maintained together with the session cache.
 289    - When a session is resumed, the servername call back invoked in order
 290      to allow the application to position itself to the right context.
 291    - The servername is acknowledged if it is new for a session or when
 292      it is identical to a previously used for the same session.
 293      Applications can control the behaviour.  They can at any time
 294      set a 'desirable' servername for a new SSL object. This can be the
 295      case for example with HTTPS when a Host: header field is received and
 296      a renegotiation is requested. In this case, a possible servername
 297      presented in the new client hello is only acknowledged if it matches
 298      the value of the Host: field.
 299    - Applications must  use SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
 300      if they provide for changing an explicit servername context for the session,
 301      i.e. when the session has been established with a servername extension.
 302    - On session reconnect, the servername extension may be absent.
 303
 304 */
 305
 306                 if (type == TLSEXT_TYPE_server_name)
 307                         {
 308                         unsigned char *sdata = data;
 309                         int servname_type;
 310                         int dsize = size-3 ;
 311
 312                         if (dsize > 0 )
 313                                 {
 314                                 servname_type = *(sdata++);
 315                                 n2s(sdata,len);
 316                                 if (len != dsize)
 317                                         {
 318                                         *al = SSL_AD_DECODE_ERROR;
 319                                         return 0;
 320                                         }
 321
 322                                 switch (servname_type)
 323                                         {
 324                                 case TLSEXT_NAMETYPE_host_name:
 325                                         if (s->session->tlsext_hostname == NULL)
 326                                                 {
 327                                                 if (len > TLSEXT_MAXLEN_host_name ||
 328                                                         ((s->session->tlsext_hostname = OPENSSL_malloc(len+1)) == NULL))
 329                                                         {
 330                                                         *al = TLS1_AD_UNRECOGNIZED_NAME;
 331                                                         return 0;
 332                                                         }
 333                                                 memcpy(s->session->tlsext_hostname, sdata, len);
 334                                                 s->session->tlsext_hostname[len]='\0';
 335                                                 if (strlen(s->session->tlsext_hostname) != len) {
 336                                                         OPENSSL_free(s->session->tlsext_hostname);
 337                                                         *al = TLS1_AD_UNRECOGNIZED_NAME;
 338                                                         return 0;
 339                                                 }
 340                                                 s->servername_done = 1;
 341
 342 #if 0
 343                                                 fprintf(stderr,"ssl_parse_clienthello_tlsext s->session->tlsext_hostname %s\n",s->session->tlsext_hostname);
 344 #endif
 345                                                 }
 346                                         else
 347                                                 s->servername_done = strlen(s->session->tlsext_hostname) == len
 348                                                         && strncmp(s->session->tlsext_hostname, (char *)sdata, len) == 0;
 349
 350                                         break;
 351
 352                                 default:
 353                                         break;
 354                                         }
 355
 356                                 }
 357                         }
 358
 359 #ifndef OPENSSL_NO_EC
 360                 else if (type == TLSEXT_TYPE_ec_point_formats)
 361                         {
 362                         unsigned char *sdata = data;
 363                         int ecpointformatlist_length = *(sdata++);
 364
 365                         if (ecpointformatlist_length != size - 1)
 366                                 {
 367                                 *al = TLS1_AD_DECODE_ERROR;
 368                                 return 0;
 369                                 }
 370                         s->session->tlsext_ecpointformatlist_length = 0;
 371                         if (s->session->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->session->tlsext_ecpointformatlist);
 372                         if ((s->session->tlsext_ecpointformatlist = OPENSSL_malloc(ecpointformatlist_length)) == NULL)
 373                                 {
 374                                 *al = TLS1_AD_INTERNAL_ERROR;
 375                                 return 0;
 376                                 }
 377                         s->session->tlsext_ecpointformatlist_length = ecpointformatlist_length;
 378                         memcpy(s->session->tlsext_ecpointformatlist, sdata, ecpointformatlist_length);
 379 #if 0
 380                         fprintf(stderr,"ssl_parse_clienthello_tlsext s->session->tlsext_ecpointformatlist (length=%i) ", s->session->tlsext_ecpointformatlist_length);
 381                         sdata = s->session->tlsext_ecpointformatlist;
 382                         for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
 383                                 fprintf(stderr,"%i ",*(sdata++));
 384                         fprintf(stderr,"\n");
 385 #endif
 386                         }
 387                 data+=size;
 388                 }
 389 #endif /* OPENSSL_NO_EC */
 390
 391         *p = data;
 392         return 1;
 393 }
 394
 395 int ssl_parse_serverhello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al)
 396         {
 397         unsigned short type;
 398         unsigned short size;
 399         unsigned short len;
 400         unsigned char *data = *p;
 401
 402         int tlsext_servername = 0;
 403 #ifndef OPENSSL_NO_EC
 404         int tlsext_ecpointformats = 0;
 405 #endif /* OPENSSL_NO_EC */
 406
 407         if (data >= (d+n-2))
 408                 return 1;
 409
 410         n2s(data,len);
 411
 412         while(data <= (d+n-4))
 413                 {
 414                 n2s(data,type);
 415                 n2s(data,size);
 416
 417                 if (data+size > (d+n))
 418                         return 1;
 419
 420                 if (type == TLSEXT_TYPE_server_name)
 421                         {
 422                         if (s->tlsext_hostname == NULL || size > 0)
 423                                 {
 424                                 *al = TLS1_AD_UNRECOGNIZED_NAME;
 425                                 return 0;
 426                                 }
 427                         tlsext_servername = 1;
 428                         }
 429
 430 #ifndef OPENSSL_NO_EC
 431                 else if (type == TLSEXT_TYPE_ec_point_formats)
 432                         {
 433                         unsigned char *sdata = data;
 434                         int ecpointformatlist_length = *(sdata++);
 435
 436                         if (ecpointformatlist_length != size - 1)
 437                                 {
 438                                 *al = TLS1_AD_DECODE_ERROR;
 439                                 return 0;
 440                                 }
 441                         s->session->tlsext_ecpointformatlist_length = 0;
 442                         if (s->session->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->session->tlsext_ecpointformatlist);
 443                         if ((s->session->tlsext_ecpointformatlist = OPENSSL_malloc(ecpointformatlist_length)) == NULL)
 444                                 {
 445                                 *al = TLS1_AD_INTERNAL_ERROR;
 446                                 return 0;
 447                                 }
 448                         s->session->tlsext_ecpointformatlist_length = ecpointformatlist_length;
 449                         memcpy(s->session->tlsext_ecpointformatlist, sdata, ecpointformatlist_length);
 450 #if 0
 451                         fprintf(stderr,"ssl_parse_serverhello_tlsext s->session->tlsext_ecpointformatlist ");
 452                         sdata = s->session->tlsext_ecpointformatlist;
 453                         for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
 454                                 fprintf(stderr,"%i ",*(sdata++));
 455                         fprintf(stderr,"\n");
 456 #endif
 457                         }
 458
 459                 data+=size;
 460                 }
 461 #endif /* OPENSSL_NO_EC */
 462
 463         if (data != d+n)
 464                 {
 465                 *al = SSL_AD_DECODE_ERROR;
 466                 return 0;
 467                 }
 468
 469         if (!s->hit && tlsext_servername == 1)
 470                 {
 471                 if (s->tlsext_hostname)
 472                         {
 473                         if (s->session->tlsext_hostname == NULL)
 474                                 {
 475                                 s->session->tlsext_hostname = BUF_strdup(s->tlsext_hostname);
 476                                 if (!s->session->tlsext_hostname)
 477                                         {
 478                                         *al = SSL_AD_UNRECOGNIZED_NAME;
 479                                         return 0;
 480                                         }
 481                                 }
 482                         else
 483                                 {
 484                                 *al = SSL_AD_DECODE_ERROR;
 485                                 return 0;
 486                                 }
 487                         }
 488                 }
 489
 490 #ifndef OPENSSL_NO_EC
 491         if (!s->hit && tlsext_ecpointformats == 1)
 492                 {
 493                 if (s->tlsext_ecpointformatlist)
 494                         {
 495                         if (s->session->tlsext_ecpointformatlist == NULL)
 496                                 {
 497                                 s->session->tlsext_ecpointformatlist_length = s->tlsext_ecpointformatlist_length;
 498                                 if (s->session->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->session->tlsext_ecpointformatlist);
 499                                 if ((s->session->tlsext_ecpointformatlist = OPENSSL_malloc(s->tlsext_ecpointformatlist_length)) == NULL)
 500                                         {
 501                                         *al = TLS1_AD_INTERNAL_ERROR;
 502                                         return 0;
 503                                         }
 504                                 memcpy(s->session->tlsext_ecpointformatlist, s->tlsext_ecpointformatlist, s->tlsext_ecpointformatlist_length);
 505                                 }
 506                         else
 507                                 {
 508                                 *al = SSL_AD_DECODE_ERROR;
 509                                 return 0;
 510                                 }
 511                         }
 512                 }
 513 #endif /* OPENSSL_NO_EC */
 514
 515         *p = data;
 516         return 1;
 517 }
 518
 519 int ssl_prepare_clienthello_tlsext(SSL *s)
 520         {
 521 #ifndef OPENSSL_NO_EC
 522         /* If we are client and using an elliptic curve cryptography cipher suite, send the point formats we
 523          * support.
 524          */
 525         int using_ecc = 0;
 526         int i;
 527         int algs;
 528         STACK_OF(SSL_CIPHER) *cipher_stack = SSL_get_ciphers(s);
 529         for (i = 0; i < sk_SSL_CIPHER_num(cipher_stack); i++)
 530                 {
 531                 algs = (sk_SSL_CIPHER_value(cipher_stack, i))->algorithms;
 532                 if ((algs & SSL_kECDH) || (algs & SSL_kECDHE) || (algs & SSL_aECDSA))
 533                         {
 534                         using_ecc = 1;
 535                         break;
 536                         }
 537
 538                 }
 539         using_ecc = using_ecc && (s->version == TLS1_VERSION);
 540         if (using_ecc)
 541                 {
 542                 if (s->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->tlsext_ecpointformatlist);
 543                 if ((s->tlsext_ecpointformatlist = OPENSSL_malloc(3)) == NULL)
 544                         {
 545                         SSLerr(SSL_F_TLS1_PREPARE_CLIENTHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
 546                         return -1;
 547                         }
 548                 s->tlsext_ecpointformatlist_length = 3;
 549                 s->tlsext_ecpointformatlist[0] = TLSEXT_ECPOINTFORMAT_uncompressed;
 550                 s->tlsext_ecpointformatlist[1] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime;
 551                 s->tlsext_ecpointformatlist[2] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2;
 552                 }
 553 #endif /* OPENSSL_NO_EC */
 554         return 1;
 555 }
 556
 557 int ssl_prepare_serverhello_tlsext(SSL *s)
 558         {
 559 #ifndef OPENSSL_NO_EC
 560         /* If we are server and using an ECC cipher suite, send the point formats we support
 561          * if the client sent us an ECPointsFormat extension.
 562          */
 563         int algs = s->s3->tmp.new_cipher->algorithms;
 564         int using_ecc = (algs & SSL_kECDH) || (algs & SSL_kECDHE) || (algs & SSL_aECDSA);
 565         using_ecc = using_ecc && (s->session->tlsext_ecpointformatlist != NULL);
 566
 567         if (using_ecc)
 568                 {
 569                 if (s->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->tlsext_ecpointformatlist);
 570                 if ((s->tlsext_ecpointformatlist = OPENSSL_malloc(3)) == NULL)
 571                         {
 572                         SSLerr(SSL_F_TLS1_PREPARE_SERVERHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
 573                         return -1;
 574                         }
 575                 s->tlsext_ecpointformatlist_length = 3;
 576                 s->tlsext_ecpointformatlist[0] = TLSEXT_ECPOINTFORMAT_uncompressed;
 577                 s->tlsext_ecpointformatlist[1] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime;
 578                 s->tlsext_ecpointformatlist[2] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2;
 579                 }
 580 #endif /* OPENSSL_NO_EC */
 581         return 1;
 582 }
 583
 584 int ssl_check_clienthello_tlsext(SSL *s)
 585         {
 586         int ret=SSL_TLSEXT_ERR_NOACK;
 587         int al = SSL_AD_UNRECOGNIZED_NAME;
 588
 589 #ifndef OPENSSL_NO_EC
 590         /* If we are server and using an elliptic curve cyrptography cipher suite, then we don't
 591          * need to check EC point formats since all clients must support uncompressed and it's the
 592          * only thing we support; we just need to copy the data in.  We probably ought to check it
 593          * for validity, but we never use it.
 594          */
 595 #endif
 596
 597         if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0)
 598                 ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg);
 599         else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0)
 600                 ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg);
 601
 602         switch (ret) {
 603                 case SSL_TLSEXT_ERR_ALERT_FATAL:
 604                         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 605                         return -1;
 606
 607                 case SSL_TLSEXT_ERR_ALERT_WARNING:
 608                         ssl3_send_alert(s,SSL3_AL_WARNING,al);
 609                         return 1;
 610
 611                 case SSL_TLSEXT_ERR_NOACK:
 612                         s->servername_done=0;
 613                         default:
 614                 return 1;
 615         }
 616 }
 617
 618 int ssl_check_serverhello_tlsext(SSL *s)
 619         {
 620         int ret=SSL_TLSEXT_ERR_NOACK;
 621         int al = SSL_AD_UNRECOGNIZED_NAME;
 622
 623 #ifndef OPENSSL_NO_EC
 624         /* If we are client and using an elliptic curve cryptography cipher suite, then server
 625          * must return a an EC point formats lists containing uncompressed.
 626          */
 627         int algs = s->s3->tmp.new_cipher->algorithms;
 628         if ((s->tlsext_ecpointformatlist != NULL) && (s->tlsext_ecpointformatlist_length > 0) &&
 629             ((algs & SSL_kECDH) || (algs & SSL_kECDHE) || (algs & SSL_aECDSA)))
 630                 {
 631                 /* we are using an ECC cipher */
 632                 int i;
 633                 unsigned char *list;
 634                 int found_uncompressed = 0;
 635                 if ((s->session->tlsext_ecpointformatlist == NULL) || (s->session->tlsext_ecpointformatlist_length <= 0))
 636                         {
 637                         SSLerr(SSL_F_TLS1_CHECK_SERVERHELLO_TLSEXT,SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST);
 638                         return -1;
 639                         }
 640                 list = s->session->tlsext_ecpointformatlist;
 641                 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
 642                         {
 643                         if (*(list++) == TLSEXT_ECPOINTFORMAT_uncompressed)
 644                                 {
 645                                 found_uncompressed = 1;
 646                                 break;
 647                                 }
 648                         }
 649                 if (!found_uncompressed)
 650                         {
 651                         SSLerr(SSL_F_TLS1_CHECK_SERVERHELLO_TLSEXT,SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST);
 652                         return -1;
 653                         }
 654                 }
 655         ret = SSL_TLSEXT_ERR_OK;
 656 #endif /* OPENSSL_NO_EC */
 657
 658         if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0)
 659                 ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg);
 660         else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0)
 661                 ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg);
 662
 663         switch (ret) {
 664                 case SSL_TLSEXT_ERR_ALERT_FATAL:
 665                         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 666                         return -1;
 667
 668                 case SSL_TLSEXT_ERR_ALERT_WARNING:
 669                         ssl3_send_alert(s,SSL3_AL_WARNING,al);
 670                         return 1;
 671
 672                 case SSL_TLSEXT_ERR_NOACK:
 673                         s->servername_done=0;
 674                         default:
 675                 return 1;
 676         }
 677 }
 678 #endif