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