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