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) 1998-2007 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 <openssl/evp.h>
 115 #include <openssl/hmac.h>
 116 #include <openssl/ocsp.h>
 117 #include <openssl/rand.h>
 118 #include "ssl_locl.h"
 119
 120 const char tls1_version_str[]="TLSv1" OPENSSL_VERSION_PTEXT;
 121
 122 #ifndef OPENSSL_NO_TLSEXT
 123 static int tls_decrypt_ticket(SSL *s, const unsigned char *tick, int ticklen,
 124                                 const unsigned char *sess_id, int sesslen,
 125                                 SSL_SESSION **psess);
 126 static int ssl_check_clienthello_tlsext_early(SSL *s);
 127 int ssl_check_serverhello_tlsext(SSL *s);
 128 #endif
 129
 130 SSL3_ENC_METHOD TLSv1_enc_data={
 131         tls1_enc,
 132         tls1_mac,
 133         tls1_setup_key_block,
 134         tls1_generate_master_secret,
 135         tls1_change_cipher_state,
 136         tls1_final_finish_mac,
 137         TLS1_FINISH_MAC_LENGTH,
 138         tls1_cert_verify_mac,
 139         TLS_MD_CLIENT_FINISH_CONST,TLS_MD_CLIENT_FINISH_CONST_SIZE,
 140         TLS_MD_SERVER_FINISH_CONST,TLS_MD_SERVER_FINISH_CONST_SIZE,
 141         tls1_alert_code,
 142         tls1_export_keying_material,
 143         0,
 144         SSL3_HM_HEADER_LENGTH,
 145         ssl3_set_handshake_header,
 146         ssl3_handshake_write
 147         };
 148
 149 SSL3_ENC_METHOD TLSv1_1_enc_data={
 150         tls1_enc,
 151         tls1_mac,
 152         tls1_setup_key_block,
 153         tls1_generate_master_secret,
 154         tls1_change_cipher_state,
 155         tls1_final_finish_mac,
 156         TLS1_FINISH_MAC_LENGTH,
 157         tls1_cert_verify_mac,
 158         TLS_MD_CLIENT_FINISH_CONST,TLS_MD_CLIENT_FINISH_CONST_SIZE,
 159         TLS_MD_SERVER_FINISH_CONST,TLS_MD_SERVER_FINISH_CONST_SIZE,
 160         tls1_alert_code,
 161         tls1_export_keying_material,
 162         SSL_ENC_FLAG_EXPLICIT_IV,
 163         SSL3_HM_HEADER_LENGTH,
 164         ssl3_set_handshake_header,
 165         ssl3_handshake_write
 166         };
 167
 168 SSL3_ENC_METHOD TLSv1_2_enc_data={
 169         tls1_enc,
 170         tls1_mac,
 171         tls1_setup_key_block,
 172         tls1_generate_master_secret,
 173         tls1_change_cipher_state,
 174         tls1_final_finish_mac,
 175         TLS1_FINISH_MAC_LENGTH,
 176         tls1_cert_verify_mac,
 177         TLS_MD_CLIENT_FINISH_CONST,TLS_MD_CLIENT_FINISH_CONST_SIZE,
 178         TLS_MD_SERVER_FINISH_CONST,TLS_MD_SERVER_FINISH_CONST_SIZE,
 179         tls1_alert_code,
 180         tls1_export_keying_material,
 181         SSL_ENC_FLAG_EXPLICIT_IV|SSL_ENC_FLAG_SIGALGS|SSL_ENC_FLAG_SHA256_PRF
 182                 |SSL_ENC_FLAG_TLS1_2_CIPHERS,
 183         SSL3_HM_HEADER_LENGTH,
 184         ssl3_set_handshake_header,
 185         ssl3_handshake_write
 186         };
 187
 188 long tls1_default_timeout(void)
 189         {
 190         /* 2 hours, the 24 hours mentioned in the TLSv1 spec
 191          * is way too long for http, the cache would over fill */
 192         return(60*60*2);
 193         }
 194
 195 int tls1_new(SSL *s)
 196         {
 197         if (!ssl3_new(s)) return(0);
 198         s->method->ssl_clear(s);
 199         return(1);
 200         }
 201
 202 void tls1_free(SSL *s)
 203         {
 204 #ifndef OPENSSL_NO_TLSEXT
 205         if (s->tlsext_session_ticket)
 206                 {
 207                 OPENSSL_free(s->tlsext_session_ticket);
 208                 }
 209 #endif /* OPENSSL_NO_TLSEXT */
 210         ssl3_free(s);
 211         }
 212
 213 void tls1_clear(SSL *s)
 214         {
 215         ssl3_clear(s);
 216         s->version = s->method->version;
 217         }
 218
 219 #ifndef OPENSSL_NO_EC
 220
 221 static int nid_list[] =
 222         {
 223                 NID_sect163k1, /* sect163k1 (1) */
 224                 NID_sect163r1, /* sect163r1 (2) */
 225                 NID_sect163r2, /* sect163r2 (3) */
 226                 NID_sect193r1, /* sect193r1 (4) */
 227                 NID_sect193r2, /* sect193r2 (5) */
 228                 NID_sect233k1, /* sect233k1 (6) */
 229                 NID_sect233r1, /* sect233r1 (7) */
 230                 NID_sect239k1, /* sect239k1 (8) */
 231                 NID_sect283k1, /* sect283k1 (9) */
 232                 NID_sect283r1, /* sect283r1 (10) */
 233                 NID_sect409k1, /* sect409k1 (11) */
 234                 NID_sect409r1, /* sect409r1 (12) */
 235                 NID_sect571k1, /* sect571k1 (13) */
 236                 NID_sect571r1, /* sect571r1 (14) */
 237                 NID_secp160k1, /* secp160k1 (15) */
 238                 NID_secp160r1, /* secp160r1 (16) */
 239                 NID_secp160r2, /* secp160r2 (17) */
 240                 NID_secp192k1, /* secp192k1 (18) */
 241                 NID_X9_62_prime192v1, /* secp192r1 (19) */
 242                 NID_secp224k1, /* secp224k1 (20) */
 243                 NID_secp224r1, /* secp224r1 (21) */
 244                 NID_secp256k1, /* secp256k1 (22) */
 245                 NID_X9_62_prime256v1, /* secp256r1 (23) */
 246                 NID_secp384r1, /* secp384r1 (24) */
 247                 NID_secp521r1,  /* secp521r1 (25) */
 248                 NID_brainpoolP256r1,  /* brainpoolP256r1 (26) */
 249                 NID_brainpoolP384r1,  /* brainpoolP384r1 (27) */
 250                 NID_brainpoolP512r1  /* brainpool512r1 (28) */
 251         };
 252
 253
 254 static const unsigned char ecformats_default[] =
 255         {
 256         TLSEXT_ECPOINTFORMAT_uncompressed,
 257         TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime,
 258         TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2
 259         };
 260
 261 static const unsigned char eccurves_default[] =
 262         {
 263                 0,14, /* sect571r1 (14) */
 264                 0,13, /* sect571k1 (13) */
 265                 0,25, /* secp521r1 (25) */
 266                 0,28, /* brainpool512r1 (28) */
 267                 0,11, /* sect409k1 (11) */
 268                 0,12, /* sect409r1 (12) */
 269                 0,27, /* brainpoolP384r1 (27) */
 270                 0,24, /* secp384r1 (24) */
 271                 0,9,  /* sect283k1 (9) */
 272                 0,10, /* sect283r1 (10) */
 273                 0,26, /* brainpoolP256r1 (26) */
 274                 0,22, /* secp256k1 (22) */
 275                 0,23, /* secp256r1 (23) */
 276                 0,8,  /* sect239k1 (8) */
 277                 0,6,  /* sect233k1 (6) */
 278                 0,7,  /* sect233r1 (7) */
 279                 0,20, /* secp224k1 (20) */
 280                 0,21, /* secp224r1 (21) */
 281                 0,4,  /* sect193r1 (4) */
 282                 0,5,  /* sect193r2 (5) */
 283                 0,18, /* secp192k1 (18) */
 284                 0,19, /* secp192r1 (19) */
 285                 0,1,  /* sect163k1 (1) */
 286                 0,2,  /* sect163r1 (2) */
 287                 0,3,  /* sect163r2 (3) */
 288                 0,15, /* secp160k1 (15) */
 289                 0,16, /* secp160r1 (16) */
 290                 0,17, /* secp160r2 (17) */
 291         };
 292
 293 static const unsigned char suiteb_curves[] =
 294         {
 295                 0, TLSEXT_curve_P_256,
 296                 0, TLSEXT_curve_P_384
 297         };
 298
 299 int tls1_ec_curve_id2nid(int curve_id)
 300         {
 301         /* ECC curves from draft-ietf-tls-ecc-12.txt (Oct. 17, 2005) */
 302         if ((curve_id < 1) || ((unsigned int)curve_id >
 303                                 sizeof(nid_list)/sizeof(nid_list[0])))
 304                 return 0;
 305         return nid_list[curve_id-1];
 306         }
 307
 308 int tls1_ec_nid2curve_id(int nid)
 309         {
 310         /* ECC curves from draft-ietf-tls-ecc-12.txt (Oct. 17, 2005) */
 311         switch (nid)
 312                 {
 313         case NID_sect163k1: /* sect163k1 (1) */
 314                 return 1;
 315         case NID_sect163r1: /* sect163r1 (2) */
 316                 return 2;
 317         case NID_sect163r2: /* sect163r2 (3) */
 318                 return 3;
 319         case NID_sect193r1: /* sect193r1 (4) */
 320                 return 4;
 321         case NID_sect193r2: /* sect193r2 (5) */
 322                 return 5;
 323         case NID_sect233k1: /* sect233k1 (6) */
 324                 return 6;
 325         case NID_sect233r1: /* sect233r1 (7) */
 326                 return 7;
 327         case NID_sect239k1: /* sect239k1 (8) */
 328                 return 8;
 329         case NID_sect283k1: /* sect283k1 (9) */
 330                 return 9;
 331         case NID_sect283r1: /* sect283r1 (10) */
 332                 return 10;
 333         case NID_sect409k1: /* sect409k1 (11) */
 334                 return 11;
 335         case NID_sect409r1: /* sect409r1 (12) */
 336                 return 12;
 337         case NID_sect571k1: /* sect571k1 (13) */
 338                 return 13;
 339         case NID_sect571r1: /* sect571r1 (14) */
 340                 return 14;
 341         case NID_secp160k1: /* secp160k1 (15) */
 342                 return 15;
 343         case NID_secp160r1: /* secp160r1 (16) */
 344                 return 16;
 345         case NID_secp160r2: /* secp160r2 (17) */
 346                 return 17;
 347         case NID_secp192k1: /* secp192k1 (18) */
 348                 return 18;
 349         case NID_X9_62_prime192v1: /* secp192r1 (19) */
 350                 return 19;
 351         case NID_secp224k1: /* secp224k1 (20) */
 352                 return 20;
 353         case NID_secp224r1: /* secp224r1 (21) */
 354                 return 21;
 355         case NID_secp256k1: /* secp256k1 (22) */
 356                 return 22;
 357         case NID_X9_62_prime256v1: /* secp256r1 (23) */
 358                 return 23;
 359         case NID_secp384r1: /* secp384r1 (24) */
 360                 return 24;
 361         case NID_secp521r1:  /* secp521r1 (25) */
 362                 return 25;
 363         case NID_brainpoolP256r1:  /* brainpoolP256r1 (26) */
 364                 return 26;
 365         case NID_brainpoolP384r1:  /* brainpoolP384r1 (27) */
 366                 return 27;
 367         case NID_brainpoolP512r1:  /* brainpool512r1 (28) */
 368                 return 28;
 369         default:
 370                 return 0;
 371                 }
 372         }
 373 /* Get curves list, if "sess" is set return client curves otherwise
 374  * preferred list
 375  */
 376 static void tls1_get_curvelist(SSL *s, int sess,
 377                                         const unsigned char **pcurves,
 378                                         size_t *pcurveslen)
 379         {
 380         if (sess)
 381                 {
 382                 *pcurves = s->session->tlsext_ellipticcurvelist;
 383                 *pcurveslen = s->session->tlsext_ellipticcurvelist_length;
 384                 return;
 385                 }
 386         /* For Suite B mode only include P-256, P-384 */
 387         switch (tls1_suiteb(s))
 388                 {
 389         case SSL_CERT_FLAG_SUITEB_128_LOS:
 390                 *pcurves = suiteb_curves;
 391                 *pcurveslen = sizeof(suiteb_curves);
 392                 break;
 393
 394         case SSL_CERT_FLAG_SUITEB_128_LOS_ONLY:
 395                 *pcurves = suiteb_curves;
 396                 *pcurveslen = 2;
 397                 break;
 398
 399         case SSL_CERT_FLAG_SUITEB_192_LOS:
 400                 *pcurves = suiteb_curves + 2;
 401                 *pcurveslen = 2;
 402                 break;
 403         default:
 404                 *pcurves = s->tlsext_ellipticcurvelist;
 405                 *pcurveslen = s->tlsext_ellipticcurvelist_length;
 406                 }
 407         if (!*pcurves)
 408                 {
 409                 *pcurves = eccurves_default;
 410                 *pcurveslen = sizeof(eccurves_default);
 411                 }
 412         }
 413 /* Check a curve is one of our preferences */
 414 int tls1_check_curve(SSL *s, const unsigned char *p, size_t len)
 415         {
 416         const unsigned char *curves;
 417         size_t curveslen, i;
 418         unsigned int suiteb_flags = tls1_suiteb(s);
 419         if (len != 3 || p[0] != NAMED_CURVE_TYPE)
 420                 return 0;
 421         /* Check curve matches Suite B preferences */
 422         if (suiteb_flags)
 423                 {
 424                 unsigned long cid = s->s3->tmp.new_cipher->id;
 425                 if (p[1])
 426                         return 0;
 427                 if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256)
 428                         {
 429                         if (p[2] != TLSEXT_curve_P_256)
 430                                 return 0;
 431                         }
 432                 else if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384)
 433                         {
 434                         if (p[2] != TLSEXT_curve_P_384)
 435                                 return 0;
 436                         }
 437                 else    /* Should never happen */
 438                         return 0;
 439                 }
 440         tls1_get_curvelist(s, 0, &curves, &curveslen);
 441         for (i = 0; i < curveslen; i += 2, curves += 2)
 442                 {
 443                 if (p[1] == curves[0] && p[2] == curves[1])
 444                         return 1;
 445                 }
 446         return 0;
 447         }
 448
 449 /* Return nth shared curve. If nmatch == -1 return number of
 450  * matches. For nmatch == -2 return the NID of the curve to use for
 451  * an EC tmp key.
 452  */
 453
 454 int tls1_shared_curve(SSL *s, int nmatch)
 455         {
 456         const unsigned char *pref, *supp;
 457         size_t preflen, supplen, i, j;
 458         int k;
 459         /* Can't do anything on client side */
 460         if (s->server == 0)
 461                 return -1;
 462         if (nmatch == -2)
 463                 {
 464                 if (tls1_suiteb(s))
 465                         {
 466                         /* For Suite B ciphersuite determines curve: we
 467                          * already know these are acceptable due to previous
 468                          * checks.
 469                          */
 470                         unsigned long cid = s->s3->tmp.new_cipher->id;
 471                         if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256)
 472                                 return NID_X9_62_prime256v1; /* P-256 */
 473                         if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384)
 474                                 return NID_secp384r1; /* P-384 */
 475                         /* Should never happen */
 476                         return NID_undef;
 477                         }
 478                 /* If not Suite B just return first preference shared curve */
 479                 nmatch = 0;
 480                 }
 481         tls1_get_curvelist(s, !!(s->options & SSL_OP_CIPHER_SERVER_PREFERENCE),
 482                                 &supp, &supplen);
 483         tls1_get_curvelist(s, !(s->options & SSL_OP_CIPHER_SERVER_PREFERENCE),
 484                                 &pref, &preflen);
 485         preflen /= 2;
 486         supplen /= 2;
 487         k = 0;
 488         for (i = 0; i < preflen; i++, pref+=2)
 489                 {
 490                 const unsigned char *tsupp = supp;
 491                 for (j = 0; j < supplen; j++, tsupp+=2)
 492                         {
 493                         if (pref[0] == tsupp[0] && pref[1] == tsupp[1])
 494                                 {
 495                                 if (nmatch == k)
 496                                         {
 497                                         int id = (pref[0] << 8) | pref[1];
 498                                         return tls1_ec_curve_id2nid(id);
 499                                         }
 500                                 k++;
 501                                 }
 502                         }
 503                 }
 504         if (nmatch == -1)
 505                 return k;
 506         return 0;
 507         }
 508
 509 int tls1_set_curves(unsigned char **pext, size_t *pextlen,
 510                         int *curves, size_t ncurves)
 511         {
 512         unsigned char *clist, *p;
 513         size_t i;
 514         /* Bitmap of curves included to detect duplicates: only works
 515          * while curve ids < 32
 516          */
 517         unsigned long dup_list = 0;
 518         clist = OPENSSL_malloc(ncurves * 2);
 519         if (!clist)
 520                 return 0;
 521         for (i = 0, p = clist; i < ncurves; i++)
 522                 {
 523                 unsigned long idmask;
 524                 int id;
 525                 id = tls1_ec_nid2curve_id(curves[i]);
 526                 idmask = 1L << id;
 527                 if (!id || (dup_list & idmask))
 528                         {
 529                         OPENSSL_free(clist);
 530                         return 0;
 531                         }
 532                 dup_list |= idmask;
 533                 s2n(id, p);
 534                 }
 535         if (*pext)
 536                 OPENSSL_free(*pext);
 537         *pext = clist;
 538         *pextlen = ncurves * 2;
 539         return 1;
 540         }
 541
 542 #define MAX_CURVELIST   28
 543
 544 typedef struct
 545         {
 546         size_t nidcnt;
 547         int nid_arr[MAX_CURVELIST];
 548         } nid_cb_st;
 549
 550 static int nid_cb(const char *elem, int len, void *arg)
 551         {
 552         nid_cb_st *narg = arg;
 553         size_t i;
 554         int nid;
 555         char etmp[20];
 556         if (narg->nidcnt == MAX_CURVELIST)
 557                 return 0;
 558         if (len > (int)(sizeof(etmp) - 1))
 559                 return 0;
 560         memcpy(etmp, elem, len);
 561         etmp[len] = 0;
 562         nid = EC_curve_nist2nid(etmp);
 563         if (nid == NID_undef)
 564                 nid = OBJ_sn2nid(etmp);
 565         if (nid == NID_undef)
 566                 nid = OBJ_ln2nid(etmp);
 567         if (nid == NID_undef)
 568                 return 0;
 569         for (i = 0; i < narg->nidcnt; i++)
 570                 if (narg->nid_arr[i] == nid)
 571                         return 0;
 572         narg->nid_arr[narg->nidcnt++] = nid;
 573         return 1;
 574         }
 575 /* Set curves based on a colon separate list */
 576 int tls1_set_curves_list(unsigned char **pext, size_t *pextlen,
 577                                 const char *str)
 578         {
 579         nid_cb_st ncb;
 580         ncb.nidcnt = 0;
 581         if (!CONF_parse_list(str, ':', 1, nid_cb, &ncb))
 582                 return 0;
 583         if (pext == NULL)
 584                 return 1;
 585         return tls1_set_curves(pext, pextlen, ncb.nid_arr, ncb.nidcnt);
 586         }
 587 /* For an EC key set TLS id and required compression based on parameters */
 588 static int tls1_set_ec_id(unsigned char *curve_id, unsigned char *comp_id,
 589                                 EC_KEY *ec)
 590         {
 591         int is_prime, id;
 592         const EC_GROUP *grp;
 593         const EC_METHOD *meth;
 594         if (!ec)
 595                 return 0;
 596         /* Determine if it is a prime field */
 597         grp = EC_KEY_get0_group(ec);
 598         if (!grp)
 599                 return 0;
 600         meth = EC_GROUP_method_of(grp);
 601         if (!meth)
 602                 return 0;
 603         if (EC_METHOD_get_field_type(meth) == NID_X9_62_prime_field)
 604                 is_prime = 1;
 605         else
 606                 is_prime = 0;
 607         /* Determine curve ID */
 608         id = EC_GROUP_get_curve_name(grp);
 609         id = tls1_ec_nid2curve_id(id);
 610         /* If we have an ID set it, otherwise set arbitrary explicit curve */
 611         if (id)
 612                 {
 613                 curve_id[0] = 0;
 614                 curve_id[1] = (unsigned char)id;
 615                 }
 616         else
 617                 {
 618                 curve_id[0] = 0xff;
 619                 if (is_prime)
 620                         curve_id[1] = 0x01;
 621                 else
 622                         curve_id[1] = 0x02;
 623                 }
 624         if (comp_id)
 625                 {
 626                 if (EC_KEY_get0_public_key(ec) == NULL)
 627                         return 0;
 628                 if (EC_KEY_get_conv_form(ec) == POINT_CONVERSION_COMPRESSED)
 629                         {
 630                         if (is_prime)
 631                                 *comp_id = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime;
 632                         else
 633                                 *comp_id = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2;
 634                         }
 635                 else
 636                         *comp_id = TLSEXT_ECPOINTFORMAT_uncompressed;
 637                 }
 638         return 1;
 639         }
 640 /* Check an EC key is compatible with extensions */
 641 static int tls1_check_ec_key(SSL *s,
 642                         unsigned char *curve_id, unsigned char *comp_id)
 643         {
 644         const unsigned char *p;
 645         size_t plen, i;
 646         int j;
 647         /* If point formats extension present check it, otherwise everything
 648          * is supported (see RFC4492).
 649          */
 650         if (comp_id && s->session->tlsext_ecpointformatlist)
 651                 {
 652                 p = s->session->tlsext_ecpointformatlist;
 653                 plen = s->session->tlsext_ecpointformatlist_length;
 654                 for (i = 0; i < plen; i++, p++)
 655                         {
 656                         if (*comp_id == *p)
 657                                 break;
 658                         }
 659                 if (i == plen)
 660                         return 0;
 661                 }
 662         if (!curve_id)
 663                 return 1;
 664         /* Check curve is consistent with client and server preferences */
 665         for (j = 0; j <= 1; j++)
 666                 {
 667                 tls1_get_curvelist(s, j, &p, &plen);
 668                 for (i = 0; i < plen; i+=2, p+=2)
 669                         {
 670                         if (p[0] == curve_id[0] && p[1] == curve_id[1])
 671                                 break;
 672                         }
 673                 if (i == plen)
 674                         return 0;
 675                 /* For clients can only check sent curve list */
 676                 if (!s->server)
 677                         return 1;
 678                 }
 679         return 1;
 680         }
 681
 682 static void tls1_get_formatlist(SSL *s, const unsigned char **pformats,
 683                                         size_t *pformatslen)
 684         {
 685         /* If we have a custom point format list use it otherwise
 686          * use default */
 687         if (s->tlsext_ecpointformatlist)
 688                 {
 689                 *pformats = s->tlsext_ecpointformatlist;
 690                 *pformatslen = s->tlsext_ecpointformatlist_length;
 691                 }
 692         else
 693                 {
 694                 *pformats = ecformats_default;
 695                 /* For Suite B we don't support char2 fields */
 696                 if (tls1_suiteb(s))
 697                         *pformatslen = sizeof(ecformats_default) - 1;
 698                 else
 699                         *pformatslen = sizeof(ecformats_default);
 700                 }
 701         }
 702
 703 /* Check cert parameters compatible with extensions: currently just checks
 704  * EC certificates have compatible curves and compression.
 705  */
 706 static int tls1_check_cert_param(SSL *s, X509 *x, int set_ee_md)
 707         {
 708         unsigned char comp_id, curve_id[2];
 709         EVP_PKEY *pkey;
 710         int rv;
 711         pkey = X509_get_pubkey(x);
 712         if (!pkey)
 713                 return 0;
 714         /* If not EC nothing to do */
 715         if (pkey->type != EVP_PKEY_EC)
 716                 {
 717                 EVP_PKEY_free(pkey);
 718                 return 1;
 719                 }
 720         rv = tls1_set_ec_id(curve_id, &comp_id, pkey->pkey.ec);
 721         EVP_PKEY_free(pkey);
 722         if (!rv)
 723                 return 0;
 724         /* Can't check curve_id for client certs as we don't have a
 725          * supported curves extension.
 726          */
 727         rv = tls1_check_ec_key(s, s->server ? curve_id : NULL, &comp_id);
 728         if (!rv)
 729                 return 0;
 730         /* Special case for suite B. We *MUST* sign using SHA256+P-256 or
 731          * SHA384+P-384, adjust digest if necessary.
 732          */
 733         if (set_ee_md && tls1_suiteb(s))
 734                 {
 735                 int check_md;
 736                 size_t i;
 737                 CERT *c = s->cert;
 738                 if (curve_id[0])
 739                         return 0;
 740                 /* Check to see we have necessary signing algorithm */
 741                 if (curve_id[1] == TLSEXT_curve_P_256)
 742                         check_md = NID_ecdsa_with_SHA256;
 743                 else if (curve_id[1] == TLSEXT_curve_P_384)
 744                         check_md = NID_ecdsa_with_SHA384;
 745                 else
 746                         return 0; /* Should never happen */
 747                 for (i = 0; i < c->shared_sigalgslen; i++)
 748                         if (check_md == c->shared_sigalgs[i].signandhash_nid)
 749                                 break;
 750                 if (i == c->shared_sigalgslen)
 751                         return 0;
 752                 if (set_ee_md == 2)
 753                         {
 754                         if (check_md == NID_ecdsa_with_SHA256)
 755                                 c->pkeys[SSL_PKEY_ECC].digest = EVP_sha256();
 756                         else
 757                                 c->pkeys[SSL_PKEY_ECC].digest = EVP_sha384();
 758                         }
 759                 }
 760         return rv;
 761         }
 762 /* Check EC temporary key is compatible with client extensions */
 763 int tls1_check_ec_tmp_key(SSL *s, unsigned long cid)
 764         {
 765         unsigned char curve_id[2];
 766         EC_KEY *ec = s->cert->ecdh_tmp;
 767 #ifdef OPENSSL_SSL_DEBUG_BROKEN_PROTOCOL
 768         /* Allow any curve: not just those peer supports */
 769         if (s->cert->cert_flags & SSL_CERT_FLAG_BROKEN_PROTOCOL)
 770                 return 1;
 771 #endif
 772         /* If Suite B, AES128 MUST use P-256 and AES256 MUST use P-384,
 773          * no other curves permitted.
 774          */
 775         if (tls1_suiteb(s))
 776                 {
 777                 /* Curve to check determined by ciphersuite */
 778                 if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256)
 779                         curve_id[1] = TLSEXT_curve_P_256;
 780                 else if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384)
 781                         curve_id[1] = TLSEXT_curve_P_384;
 782                 else
 783                         return 0;
 784                 curve_id[0] = 0;
 785                 /* Check this curve is acceptable */
 786                 if (!tls1_check_ec_key(s, curve_id, NULL))
 787                         return 0;
 788                 /* If auto or setting curve from callback assume OK */
 789                 if (s->cert->ecdh_tmp_auto || s->cert->ecdh_tmp_cb)
 790                         return 1;
 791                 /* Otherwise check curve is acceptable */
 792                 else
 793                         {
 794                         unsigned char curve_tmp[2];
 795                         if (!ec)
 796                                 return 0;
 797                         if (!tls1_set_ec_id(curve_tmp, NULL, ec))
 798                                 return 0;
 799                         if (!curve_tmp[0] || curve_tmp[1] == curve_id[1])
 800                                 return 1;
 801                         return 0;
 802                         }
 803
 804                 }
 805         if (s->cert->ecdh_tmp_auto)
 806                 {
 807                 /* Need a shared curve */
 808                 if (tls1_shared_curve(s, 0))
 809                         return 1;
 810                 else return 0;
 811                 }
 812         if (!ec)
 813                 {
 814                 if (s->cert->ecdh_tmp_cb)
 815                         return 1;
 816                 else
 817                         return 0;
 818                 }
 819         if (!tls1_set_ec_id(curve_id, NULL, ec))
 820                 return 0;
 821 /* Set this to allow use of invalid curves for testing */
 822 #if 0
 823         return 1;
 824 #else
 825         return tls1_check_ec_key(s, curve_id, NULL);
 826 #endif
 827         }
 828
 829 #else
 830
 831 static int tls1_check_cert_param(SSL *s, X509 *x, int set_ee_md)
 832         {
 833         return 1;
 834         }
 835
 836 #endif /* OPENSSL_NO_EC */
 837
 838 #ifndef OPENSSL_NO_TLSEXT
 839
 840 /* List of supported signature algorithms and hashes. Should make this
 841  * customisable at some point, for now include everything we support.
 842  */
 843
 844 #ifdef OPENSSL_NO_RSA
 845 #define tlsext_sigalg_rsa(md) /* */
 846 #else
 847 #define tlsext_sigalg_rsa(md) md, TLSEXT_signature_rsa,
 848 #endif
 849
 850 #ifdef OPENSSL_NO_DSA
 851 #define tlsext_sigalg_dsa(md) /* */
 852 #else
 853 #define tlsext_sigalg_dsa(md) md, TLSEXT_signature_dsa,
 854 #endif
 855
 856 #ifdef OPENSSL_NO_ECDSA
 857 #define tlsext_sigalg_ecdsa(md) /* */
 858 #else
 859 #define tlsext_sigalg_ecdsa(md) md, TLSEXT_signature_ecdsa,
 860 #endif
 861
 862 #define tlsext_sigalg(md) \
 863                 tlsext_sigalg_rsa(md) \
 864                 tlsext_sigalg_dsa(md) \
 865                 tlsext_sigalg_ecdsa(md)
 866
 867 static unsigned char tls12_sigalgs[] = {
 868 #ifndef OPENSSL_NO_SHA512
 869         tlsext_sigalg(TLSEXT_hash_sha512)
 870         tlsext_sigalg(TLSEXT_hash_sha384)
 871 #endif
 872 #ifndef OPENSSL_NO_SHA256
 873         tlsext_sigalg(TLSEXT_hash_sha256)
 874         tlsext_sigalg(TLSEXT_hash_sha224)
 875 #endif
 876 #ifndef OPENSSL_NO_SHA
 877         tlsext_sigalg(TLSEXT_hash_sha1)
 878 #endif
 879 };
 880 #ifndef OPENSSL_NO_ECDSA
 881 static unsigned char suiteb_sigalgs[] = {
 882         tlsext_sigalg_ecdsa(TLSEXT_hash_sha256)
 883         tlsext_sigalg_ecdsa(TLSEXT_hash_sha384)
 884 };
 885 #endif
 886 size_t tls12_get_psigalgs(SSL *s, const unsigned char **psigs)
 887         {
 888         /* If Suite B mode use Suite B sigalgs only, ignore any other
 889          * preferences.
 890          */
 891 #ifndef OPENSSL_NO_EC
 892         switch (tls1_suiteb(s))
 893                 {
 894         case SSL_CERT_FLAG_SUITEB_128_LOS:
 895                 *psigs = suiteb_sigalgs;
 896                 return sizeof(suiteb_sigalgs);
 897
 898         case SSL_CERT_FLAG_SUITEB_128_LOS_ONLY:
 899                 *psigs = suiteb_sigalgs;
 900                 return 2;
 901
 902         case SSL_CERT_FLAG_SUITEB_192_LOS:
 903                 *psigs = suiteb_sigalgs + 2;
 904                 return 2;
 905                 }
 906 #endif
 907         /* If server use client authentication sigalgs if not NULL */
 908         if (s->server && s->cert->client_sigalgs)
 909                 {
 910                 *psigs = s->cert->client_sigalgs;
 911                 return s->cert->client_sigalgslen;
 912                 }
 913         else if (s->cert->conf_sigalgs)
 914                 {
 915                 *psigs = s->cert->conf_sigalgs;
 916                 return s->cert->conf_sigalgslen;
 917                 }
 918         else
 919                 {
 920                 *psigs = tls12_sigalgs;
 921                 return sizeof(tls12_sigalgs);
 922                 }
 923         }
 924 /* Check signature algorithm is consistent with sent supported signature
 925  * algorithms and if so return relevant digest.
 926  */
 927 int tls12_check_peer_sigalg(const EVP_MD **pmd, SSL *s,
 928                                 const unsigned char *sig, EVP_PKEY *pkey)
 929         {
 930         const unsigned char *sent_sigs;
 931         size_t sent_sigslen, i;
 932         int sigalg = tls12_get_sigid(pkey);
 933         /* Should never happen */
 934         if (sigalg == -1)
 935                 return -1;
 936         /* Check key type is consistent with signature */
 937         if (sigalg != (int)sig[1])
 938                 {
 939                 SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG,SSL_R_WRONG_SIGNATURE_TYPE);
 940                 return 0;
 941                 }
 942 #ifndef OPENSSL_NO_EC
 943         if (pkey->type == EVP_PKEY_EC)
 944                 {
 945                 unsigned char curve_id[2], comp_id;
 946                 /* Check compression and curve matches extensions */
 947                 if (!tls1_set_ec_id(curve_id, &comp_id, pkey->pkey.ec))
 948                         return 0;
 949                 if (!s->server && !tls1_check_ec_key(s, curve_id, &comp_id))
 950                         {
 951                         SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG,SSL_R_WRONG_CURVE);
 952                         return 0;
 953                         }
 954                 /* If Suite B only P-384+SHA384 or P-256+SHA-256 allowed */
 955                 if (tls1_suiteb(s))
 956                         {
 957                         if (curve_id[0])
 958                                 return 0;
 959                         if (curve_id[1] == TLSEXT_curve_P_256)
 960                                 {
 961                                 if (sig[0] != TLSEXT_hash_sha256)
 962                                         {
 963                                         SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG,
 964                                                 SSL_R_ILLEGAL_SUITEB_DIGEST);
 965                                         return 0;
 966                                         }
 967                                 }
 968                         else if (curve_id[1] == TLSEXT_curve_P_384)
 969                                 {
 970                                 if (sig[0] != TLSEXT_hash_sha384)
 971                                         {
 972                                         SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG,
 973                                                 SSL_R_ILLEGAL_SUITEB_DIGEST);
 974                                         return 0;
 975                                         }
 976                                 }
 977                         else
 978                                 return 0;
 979                         }
 980                 }
 981         else if (tls1_suiteb(s))
 982                 return 0;
 983 #endif
 984
 985         /* Check signature matches a type we sent */
 986         sent_sigslen = tls12_get_psigalgs(s, &sent_sigs);
 987         for (i = 0; i < sent_sigslen; i+=2, sent_sigs+=2)
 988                 {
 989                 if (sig[0] == sent_sigs[0] && sig[1] == sent_sigs[1])
 990                         break;
 991                 }
 992         /* Allow fallback to SHA1 if not strict mode */
 993         if (i == sent_sigslen && (sig[0] != TLSEXT_hash_sha1 || s->cert->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT))
 994                 {
 995                 SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG,SSL_R_WRONG_SIGNATURE_TYPE);
 996                 return 0;
 997                 }
 998         *pmd = tls12_get_hash(sig[0]);
 999         if (*pmd == NULL)
1000                 {
1001                 SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG,SSL_R_UNKNOWN_DIGEST);
1002                 return 0;
1003                 }
1004         /* Store the digest used so applications can retrieve it if they
1005          * wish.
1006          */
1007         if (s->session && s->session->sess_cert)
1008                 s->session->sess_cert->peer_key->digest = *pmd;
1009         return 1;
1010         }
1011 /* Get a mask of disabled algorithms: an algorithm is disabled
1012  * if it isn't supported or doesn't appear in supported signature
1013  * algorithms. Unlike ssl_cipher_get_disabled this applies to a specific
1014  * session and not global settings.
1015  *
1016  */
1017 void ssl_set_client_disabled(SSL *s)
1018         {
1019         CERT *c = s->cert;
1020         const unsigned char *sigalgs;
1021         size_t i, sigalgslen;
1022         int have_rsa = 0, have_dsa = 0, have_ecdsa = 0;
1023         c->mask_a = 0;
1024         c->mask_k = 0;
1025         /* Don't allow TLS 1.2 only ciphers if we don't suppport them */
1026         if (!SSL_CLIENT_USE_TLS1_2_CIPHERS(s))
1027                 c->mask_ssl = SSL_TLSV1_2;
1028         else
1029                 c->mask_ssl = 0;
1030         /* Now go through all signature algorithms seeing if we support
1031          * any for RSA, DSA, ECDSA. Do this for all versions not just
1032          * TLS 1.2.
1033          */
1034         sigalgslen = tls12_get_psigalgs(s, &sigalgs);
1035         for (i = 0; i < sigalgslen; i += 2, sigalgs += 2)
1036                 {
1037                 switch(sigalgs[1])
1038                         {
1039 #ifndef OPENSSL_NO_RSA
1040                 case TLSEXT_signature_rsa:
1041                         have_rsa = 1;
1042                         break;
1043 #endif
1044 #ifndef OPENSSL_NO_DSA
1045                 case TLSEXT_signature_dsa:
1046                         have_dsa = 1;
1047                         break;
1048 #endif
1049 #ifndef OPENSSL_NO_ECDSA
1050                 case TLSEXT_signature_ecdsa:
1051                         have_ecdsa = 1;
1052                         break;
1053 #endif
1054                         }
1055                 }
1056         /* Disable auth and static DH if we don't include any appropriate
1057          * signature algorithms.
1058          */
1059         if (!have_rsa)
1060                 {
1061                 c->mask_a |= SSL_aRSA;
1062                 c->mask_k |= SSL_kDHr|SSL_kECDHr;
1063                 }
1064         if (!have_dsa)
1065                 {
1066                 c->mask_a |= SSL_aDSS;
1067                 c->mask_k |= SSL_kDHd;
1068                 }
1069         if (!have_ecdsa)
1070                 {
1071                 c->mask_a |= SSL_aECDSA;
1072                 c->mask_k |= SSL_kECDHe;
1073                 }
1074 #ifndef OPENSSL_NO_KRB5
1075         if (!kssl_tgt_is_available(s->kssl_ctx))
1076                 {
1077                 c->mask_a |= SSL_aKRB5;
1078                 c->mask_k |= SSL_kKRB5;
1079                 }
1080 #endif
1081 #ifndef OPENSSL_NO_PSK
1082         /* with PSK there must be client callback set */
1083         if (!s->psk_client_callback)
1084                 {
1085                 c->mask_a |= SSL_aPSK;
1086                 c->mask_k |= SSL_kPSK;
1087                 }
1088 #endif /* OPENSSL_NO_PSK */
1089         c->valid = 1;
1090         }
1091
1092 unsigned char *ssl_add_clienthello_tlsext(SSL *s, unsigned char *p, unsigned char *limit, int *al)
1093         {
1094         int extdatalen=0;
1095         unsigned char *ret = p;
1096 #ifndef OPENSSL_NO_EC
1097         /* See if we support any ECC ciphersuites */
1098         int using_ecc = 0;
1099         if (s->version >= TLS1_VERSION || SSL_IS_DTLS(s))
1100                 {
1101                 int i;
1102                 unsigned long alg_k, alg_a;
1103                 STACK_OF(SSL_CIPHER) *cipher_stack = SSL_get_ciphers(s);
1104
1105                 for (i = 0; i < sk_SSL_CIPHER_num(cipher_stack); i++)
1106                         {
1107                         SSL_CIPHER *c = sk_SSL_CIPHER_value(cipher_stack, i);
1108
1109                         alg_k = c->algorithm_mkey;
1110                         alg_a = c->algorithm_auth;
1111                         if ((alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)
1112                                 || (alg_a & SSL_aECDSA)))
1113                                 {
1114                                 using_ecc = 1;
1115                                 break;
1116                                 }
1117                         }
1118                 }
1119 #endif
1120
1121         /* don't add extensions for SSLv3 unless doing secure renegotiation */
1122         if (s->client_version == SSL3_VERSION
1123                                         && !s->s3->send_connection_binding)
1124                 return p;
1125
1126         ret+=2;
1127
1128         if (ret>=limit) return NULL; /* this really never occurs, but ... */
1129
1130         if (s->tlsext_hostname != NULL)
1131                 {
1132                 /* Add TLS extension servername to the Client Hello message */
1133                 unsigned long size_str;
1134                 long lenmax;
1135
1136                 /* check for enough space.
1137                    4 for the servername type and entension length
1138                    2 for servernamelist length
1139                    1 for the hostname type
1140                    2 for hostname length
1141                    + hostname length
1142                 */
1143
1144                 if ((lenmax = limit - ret - 9) < 0
1145                     || (size_str = strlen(s->tlsext_hostname)) > (unsigned long)lenmax)
1146                         return NULL;
1147
1148                 /* extension type and length */
1149                 s2n(TLSEXT_TYPE_server_name,ret);
1150                 s2n(size_str+5,ret);
1151
1152                 /* length of servername list */
1153                 s2n(size_str+3,ret);
1154
1155                 /* hostname type, length and hostname */
1156                 *(ret++) = (unsigned char) TLSEXT_NAMETYPE_host_name;
1157                 s2n(size_str,ret);
1158                 memcpy(ret, s->tlsext_hostname, size_str);
1159                 ret+=size_str;
1160                 }
1161
1162         /* Add RI if renegotiating */
1163         if (s->renegotiate)
1164           {
1165           int el;
1166
1167           if(!ssl_add_clienthello_renegotiate_ext(s, 0, &el, 0))
1168               {
1169               SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1170               return NULL;
1171               }
1172
1173           if((limit - p - 4 - el) < 0) return NULL;
1174
1175           s2n(TLSEXT_TYPE_renegotiate,ret);
1176           s2n(el,ret);
1177
1178           if(!ssl_add_clienthello_renegotiate_ext(s, ret, &el, el))
1179               {
1180               SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1181               return NULL;
1182               }
1183
1184           ret += el;
1185         }
1186
1187 #ifndef OPENSSL_NO_SRP
1188         /* Add SRP username if there is one */
1189         if (s->srp_ctx.login != NULL)
1190                 { /* Add TLS extension SRP username to the Client Hello message */
1191
1192                 int login_len = strlen(s->srp_ctx.login);
1193                 if (login_len > 255 || login_len == 0)
1194                         {
1195                         SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1196                         return NULL;
1197                         }
1198
1199                 /* check for enough space.
1200                    4 for the srp type type and entension length
1201                    1 for the srp user identity
1202                    + srp user identity length
1203                 */
1204                 if ((limit - ret - 5 - login_len) < 0) return NULL;
1205
1206                 /* fill in the extension */
1207                 s2n(TLSEXT_TYPE_srp,ret);
1208                 s2n(login_len+1,ret);
1209                 (*ret++) = (unsigned char) login_len;
1210                 memcpy(ret, s->srp_ctx.login, login_len);
1211                 ret+=login_len;
1212                 }
1213 #endif
1214
1215 #ifndef OPENSSL_NO_EC
1216         if (using_ecc)
1217                 {
1218                 /* Add TLS extension ECPointFormats to the ClientHello message */
1219                 long lenmax;
1220                 const unsigned char *plist;
1221                 size_t plistlen;
1222
1223                 tls1_get_formatlist(s, &plist, &plistlen);
1224
1225                 if ((lenmax = limit - ret - 5) < 0) return NULL;
1226                 if (plistlen > (size_t)lenmax) return NULL;
1227                 if (plistlen > 255)
1228                         {
1229                         SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1230                         return NULL;
1231                         }
1232
1233                 s2n(TLSEXT_TYPE_ec_point_formats,ret);
1234                 s2n(plistlen + 1,ret);
1235                 *(ret++) = (unsigned char)plistlen ;
1236                 memcpy(ret, plist, plistlen);
1237                 ret+=plistlen;
1238
1239                 /* Add TLS extension EllipticCurves to the ClientHello message */
1240                 plist = s->tlsext_ellipticcurvelist;
1241                 tls1_get_curvelist(s, 0, &plist, &plistlen);
1242
1243                 if ((lenmax = limit - ret - 6) < 0) return NULL;
1244                 if (plistlen > (size_t)lenmax) return NULL;
1245                 if (plistlen > 65532)
1246                         {
1247                         SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1248                         return NULL;
1249                         }
1250
1251                 s2n(TLSEXT_TYPE_elliptic_curves,ret);
1252                 s2n(plistlen + 2, ret);
1253
1254                 /* NB: draft-ietf-tls-ecc-12.txt uses a one-byte prefix for
1255                  * elliptic_curve_list, but the examples use two bytes.
1256                  * http://www1.ietf.org/mail-archive/web/tls/current/msg00538.html
1257                  * resolves this to two bytes.
1258                  */
1259                 s2n(plistlen, ret);
1260                 memcpy(ret, plist, plistlen);
1261                 ret+=plistlen;
1262                 }
1263 #endif /* OPENSSL_NO_EC */
1264
1265         if (!(SSL_get_options(s) & SSL_OP_NO_TICKET))
1266                 {
1267                 int ticklen;
1268                 if (!s->new_session && s->session && s->session->tlsext_tick)
1269                         ticklen = s->session->tlsext_ticklen;
1270                 else if (s->session && s->tlsext_session_ticket &&
1271                          s->tlsext_session_ticket->data)
1272                         {
1273                         ticklen = s->tlsext_session_ticket->length;
1274                         s->session->tlsext_tick = OPENSSL_malloc(ticklen);
1275                         if (!s->session->tlsext_tick)
1276                                 return NULL;
1277                         memcpy(s->session->tlsext_tick,
1278                                s->tlsext_session_ticket->data,
1279                                ticklen);
1280                         s->session->tlsext_ticklen = ticklen;
1281                         }
1282                 else
1283                         ticklen = 0;
1284                 if (ticklen == 0 && s->tlsext_session_ticket &&
1285                     s->tlsext_session_ticket->data == NULL)
1286                         goto skip_ext;
1287                 /* Check for enough room 2 for extension type, 2 for len
1288                  * rest for ticket
1289                  */
1290                 if ((long)(limit - ret - 4 - ticklen) < 0) return NULL;
1291                 s2n(TLSEXT_TYPE_session_ticket,ret);
1292                 s2n(ticklen,ret);
1293                 if (ticklen)
1294                         {
1295                         memcpy(ret, s->session->tlsext_tick, ticklen);
1296                         ret += ticklen;
1297                         }
1298                 }
1299                 skip_ext:
1300
1301         if (SSL_USE_SIGALGS(s))
1302                 {
1303                 size_t salglen;
1304                 const unsigned char *salg;
1305                 salglen = tls12_get_psigalgs(s, &salg);
1306                 if ((size_t)(limit - ret) < salglen + 6)
1307                         return NULL;
1308                 s2n(TLSEXT_TYPE_signature_algorithms,ret);
1309                 s2n(salglen + 2, ret);
1310                 s2n(salglen, ret);
1311                 memcpy(ret, salg, salglen);
1312                 ret += salglen;
1313                 }
1314
1315 #ifdef TLSEXT_TYPE_opaque_prf_input
1316         if (s->s3->client_opaque_prf_input != NULL)
1317                 {
1318                 size_t col = s->s3->client_opaque_prf_input_len;
1319
1320                 if ((long)(limit - ret - 6 - col < 0))
1321                         return NULL;
1322                 if (col > 0xFFFD) /* can't happen */
1323                         return NULL;
1324
1325                 s2n(TLSEXT_TYPE_opaque_prf_input, ret);
1326                 s2n(col + 2, ret);
1327                 s2n(col, ret);
1328                 memcpy(ret, s->s3->client_opaque_prf_input, col);
1329                 ret += col;
1330                 }
1331 #endif
1332
1333         if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp)
1334                 {
1335                 int i;
1336                 long extlen, idlen, itmp;
1337                 OCSP_RESPID *id;
1338
1339                 idlen = 0;
1340                 for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++)
1341                         {
1342                         id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i);
1343                         itmp = i2d_OCSP_RESPID(id, NULL);
1344                         if (itmp <= 0)
1345                                 return NULL;
1346                         idlen += itmp + 2;
1347                         }
1348
1349                 if (s->tlsext_ocsp_exts)
1350                         {
1351                         extlen = i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, NULL);
1352                         if (extlen < 0)
1353                                 return NULL;
1354                         }
1355                 else
1356                         extlen = 0;
1357
1358                 if ((long)(limit - ret - 7 - extlen - idlen) < 0) return NULL;
1359                 s2n(TLSEXT_TYPE_status_request, ret);
1360                 if (extlen + idlen > 0xFFF0)
1361                         return NULL;
1362                 s2n(extlen + idlen + 5, ret);
1363                 *(ret++) = TLSEXT_STATUSTYPE_ocsp;
1364                 s2n(idlen, ret);
1365                 for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++)
1366                         {
1367                         /* save position of id len */
1368                         unsigned char *q = ret;
1369                         id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i);
1370                         /* skip over id len */
1371                         ret += 2;
1372                         itmp = i2d_OCSP_RESPID(id, &ret);
1373                         /* write id len */
1374                         s2n(itmp, q);
1375                         }
1376                 s2n(extlen, ret);
1377                 if (extlen > 0)
1378                         i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, &ret);
1379                 }
1380
1381 #ifndef OPENSSL_NO_HEARTBEATS
1382         /* Add Heartbeat extension */
1383         if ((limit - ret - 4 - 1) < 0)
1384                 return NULL;
1385         s2n(TLSEXT_TYPE_heartbeat,ret);
1386         s2n(1,ret);
1387         /* Set mode:
1388          * 1: peer may send requests
1389          * 2: peer not allowed to send requests
1390          */
1391         if (s->tlsext_heartbeat & SSL_TLSEXT_HB_DONT_RECV_REQUESTS)
1392                 *(ret++) = SSL_TLSEXT_HB_DONT_SEND_REQUESTS;
1393         else
1394                 *(ret++) = SSL_TLSEXT_HB_ENABLED;
1395 #endif
1396
1397 #ifndef OPENSSL_NO_NEXTPROTONEG
1398         if (s->ctx->next_proto_select_cb && !s->s3->tmp.finish_md_len)
1399                 {
1400                 /* The client advertises an emtpy extension to indicate its
1401                  * support for Next Protocol Negotiation */
1402                 if (limit - ret - 4 < 0)
1403                         return NULL;
1404                 s2n(TLSEXT_TYPE_next_proto_neg,ret);
1405                 s2n(0,ret);
1406                 }
1407 #endif
1408
1409         if (s->alpn_client_proto_list && !s->s3->tmp.finish_md_len)
1410                 {
1411                 if ((size_t)(limit - ret) < 6 + s->alpn_client_proto_list_len)
1412                         return NULL;
1413                 s2n(TLSEXT_TYPE_application_layer_protocol_negotiation,ret);
1414                 s2n(2 + s->alpn_client_proto_list_len,ret);
1415                 s2n(s->alpn_client_proto_list_len,ret);
1416                 memcpy(ret, s->alpn_client_proto_list,
1417                        s->alpn_client_proto_list_len);
1418                 ret += s->alpn_client_proto_list_len;
1419                 }
1420
1421         if(SSL_get_srtp_profiles(s))
1422                 {
1423                 int el;
1424
1425                 ssl_add_clienthello_use_srtp_ext(s, 0, &el, 0);
1426
1427                 if((limit - p - 4 - el) < 0) return NULL;
1428
1429                 s2n(TLSEXT_TYPE_use_srtp,ret);
1430                 s2n(el,ret);
1431
1432                 if(ssl_add_clienthello_use_srtp_ext(s, ret, &el, el))
1433                         {
1434                         SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1435                         return NULL;
1436                         }
1437                 ret += el;
1438                 }
1439
1440         /* Add custom TLS Extensions to ClientHello */
1441         if (s->ctx->custom_cli_ext_records_count)
1442                 {
1443                 size_t i;
1444                 custom_cli_ext_record* record;
1445
1446                 for (i = 0; i < s->ctx->custom_cli_ext_records_count; i++)
1447                         {
1448                         const unsigned char* out = NULL;
1449                         unsigned short outlen = 0;
1450
1451                         record = &s->ctx->custom_cli_ext_records[i];
1452                         /* NULL callback sends empty extension */
1453                         /* -1 from callback omits extension */
1454                         if (record->fn1)
1455                                 {
1456                                 int cb_retval = 0;
1457                                 cb_retval = record->fn1(s, record->ext_type,
1458                                                         &out, &outlen, al,
1459                                                         record->arg);
1460                                 if (cb_retval == 0)
1461                                         return NULL; /* error */
1462                                 if (cb_retval == -1)
1463                                         continue; /* skip this extension */
1464                                 }
1465                         if (limit < ret + 4 + outlen)
1466                                 return NULL;
1467                         s2n(record->ext_type, ret);
1468                         s2n(outlen, ret);
1469                         memcpy(ret, out, outlen);
1470                         ret += outlen;
1471                         }
1472                 }
1473         /* Add padding to workaround bugs in F5 terminators.
1474          * See https://tools.ietf.org/html/draft-agl-tls-padding-03
1475          *
1476          * NB: because this code works out the length of all existing
1477          * extensions it MUST always appear last.
1478          */
1479         if (s->options & SSL_OP_TLSEXT_PADDING)
1480                 {
1481                 int hlen = ret - (unsigned char *)s->init_buf->data;
1482                 /* The code in s23_clnt.c to build ClientHello messages
1483                  * includes the 5-byte record header in the buffer, while
1484                  * the code in s3_clnt.c does not.
1485                  */
1486                 if (s->state == SSL23_ST_CW_CLNT_HELLO_A)
1487                         hlen -= 5;
1488                 if (hlen > 0xff && hlen < 0x200)
1489                         {
1490                         hlen = 0x200 - hlen;
1491                         if (hlen >= 4)
1492                                 hlen -= 4;
1493                         else
1494                                 hlen = 0;
1495
1496                         s2n(TLSEXT_TYPE_padding, ret);
1497                         s2n(hlen, ret);
1498                         memset(ret, 0, hlen);
1499                         ret += hlen;
1500                         }
1501                 }
1502
1503         if ((extdatalen = ret-p-2) == 0)
1504                 return p;
1505
1506         s2n(extdatalen,p);
1507         return ret;
1508         }
1509
1510 unsigned char *ssl_add_serverhello_tlsext(SSL *s, unsigned char *p, unsigned char *limit, int *al)
1511         {
1512         int extdatalen=0;
1513         unsigned char *ret = p;
1514         size_t i;
1515         custom_srv_ext_record *record;
1516 #ifndef OPENSSL_NO_NEXTPROTONEG
1517         int next_proto_neg_seen;
1518 #endif
1519 #ifndef OPENSSL_NO_EC
1520         unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
1521         unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth;
1522         int using_ecc = (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) || (alg_a & SSL_aECDSA);
1523         using_ecc = using_ecc && (s->session->tlsext_ecpointformatlist != NULL);
1524 #endif
1525         /* don't add extensions for SSLv3, unless doing secure renegotiation */
1526         if (s->version == SSL3_VERSION && !s->s3->send_connection_binding)
1527                 return p;
1528
1529         ret+=2;
1530         if (ret>=limit) return NULL; /* this really never occurs, but ... */
1531
1532         if (!s->hit && s->servername_done == 1 && s->session->tlsext_hostname != NULL)
1533                 {
1534                 if ((long)(limit - ret - 4) < 0) return NULL;
1535
1536                 s2n(TLSEXT_TYPE_server_name,ret);
1537                 s2n(0,ret);
1538                 }
1539
1540         if(s->s3->send_connection_binding)
1541         {
1542           int el;
1543
1544           if(!ssl_add_serverhello_renegotiate_ext(s, 0, &el, 0))
1545               {
1546               SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1547               return NULL;
1548               }
1549
1550           if((limit - p - 4 - el) < 0) return NULL;
1551
1552           s2n(TLSEXT_TYPE_renegotiate,ret);
1553           s2n(el,ret);
1554
1555           if(!ssl_add_serverhello_renegotiate_ext(s, ret, &el, el))
1556               {
1557               SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1558               return NULL;
1559               }
1560
1561           ret += el;
1562         }
1563
1564 #ifndef OPENSSL_NO_EC
1565         if (using_ecc)
1566                 {
1567                 const unsigned char *plist;
1568                 size_t plistlen;
1569                 /* Add TLS extension ECPointFormats to the ServerHello message */
1570                 long lenmax;
1571
1572                 tls1_get_formatlist(s, &plist, &plistlen);
1573
1574                 if ((lenmax = limit - ret - 5) < 0) return NULL;
1575                 if (plistlen > (size_t)lenmax) return NULL;
1576                 if (plistlen > 255)
1577                         {
1578                         SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1579                         return NULL;
1580                         }
1581
1582                 s2n(TLSEXT_TYPE_ec_point_formats,ret);
1583                 s2n(plistlen + 1,ret);
1584                 *(ret++) = (unsigned char) plistlen;
1585                 memcpy(ret, plist, plistlen);
1586                 ret+=plistlen;
1587
1588                 }
1589         /* Currently the server should not respond with a SupportedCurves extension */
1590 #endif /* OPENSSL_NO_EC */
1591
1592         if (s->tlsext_ticket_expected
1593                 && !(SSL_get_options(s) & SSL_OP_NO_TICKET))
1594                 {
1595                 if ((long)(limit - ret - 4) < 0) return NULL;
1596                 s2n(TLSEXT_TYPE_session_ticket,ret);
1597                 s2n(0,ret);
1598                 }
1599
1600         if (s->tlsext_status_expected)
1601                 {
1602                 if ((long)(limit - ret - 4) < 0) return NULL;
1603                 s2n(TLSEXT_TYPE_status_request,ret);
1604                 s2n(0,ret);
1605                 }
1606
1607 #ifdef TLSEXT_TYPE_opaque_prf_input
1608         if (s->s3->server_opaque_prf_input != NULL)
1609                 {
1610                 size_t sol = s->s3->server_opaque_prf_input_len;
1611
1612                 if ((long)(limit - ret - 6 - sol) < 0)
1613                         return NULL;
1614                 if (sol > 0xFFFD) /* can't happen */
1615                         return NULL;
1616
1617                 s2n(TLSEXT_TYPE_opaque_prf_input, ret);
1618                 s2n(sol + 2, ret);
1619                 s2n(sol, ret);
1620                 memcpy(ret, s->s3->server_opaque_prf_input, sol);
1621                 ret += sol;
1622                 }
1623 #endif
1624
1625         if(s->srtp_profile)
1626                 {
1627                 int el;
1628
1629                 ssl_add_serverhello_use_srtp_ext(s, 0, &el, 0);
1630
1631                 if((limit - p - 4 - el) < 0) return NULL;
1632
1633                 s2n(TLSEXT_TYPE_use_srtp,ret);
1634                 s2n(el,ret);
1635
1636                 if(ssl_add_serverhello_use_srtp_ext(s, ret, &el, el))
1637                         {
1638                         SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1639                         return NULL;
1640                         }
1641                 ret+=el;
1642                 }
1643
1644         if (((s->s3->tmp.new_cipher->id & 0xFFFF)==0x80 || (s->s3->tmp.new_cipher->id & 0xFFFF)==0x81)
1645                 && (SSL_get_options(s) & SSL_OP_CRYPTOPRO_TLSEXT_BUG))
1646                 { const unsigned char cryptopro_ext[36] = {
1647                         0xfd, 0xe8, /*65000*/
1648                         0x00, 0x20, /*32 bytes length*/
1649                         0x30, 0x1e, 0x30, 0x08, 0x06, 0x06, 0x2a, 0x85,
1650                         0x03,   0x02, 0x02, 0x09, 0x30, 0x08, 0x06, 0x06,
1651                         0x2a, 0x85, 0x03, 0x02, 0x02, 0x16, 0x30, 0x08,
1652                         0x06, 0x06, 0x2a, 0x85, 0x03, 0x02, 0x02, 0x17};
1653                         if (limit-ret<36) return NULL;
1654                         memcpy(ret,cryptopro_ext,36);
1655                         ret+=36;
1656
1657                 }
1658
1659 #ifndef OPENSSL_NO_HEARTBEATS
1660         /* Add Heartbeat extension if we've received one */
1661         if (s->tlsext_heartbeat & SSL_TLSEXT_HB_ENABLED)
1662                 {
1663                 if ((limit - ret - 4 - 1) < 0)
1664                         return NULL;
1665                 s2n(TLSEXT_TYPE_heartbeat,ret);
1666                 s2n(1,ret);
1667                 /* Set mode:
1668                  * 1: peer may send requests
1669                  * 2: peer not allowed to send requests
1670                  */
1671                 if (s->tlsext_heartbeat & SSL_TLSEXT_HB_DONT_RECV_REQUESTS)
1672                         *(ret++) = SSL_TLSEXT_HB_DONT_SEND_REQUESTS;
1673                 else
1674                         *(ret++) = SSL_TLSEXT_HB_ENABLED;
1675
1676                 }
1677 #endif
1678
1679 #ifndef OPENSSL_NO_NEXTPROTONEG
1680         next_proto_neg_seen = s->s3->next_proto_neg_seen;
1681         s->s3->next_proto_neg_seen = 0;
1682         if (next_proto_neg_seen && s->ctx->next_protos_advertised_cb)
1683                 {
1684                 const unsigned char *npa;
1685                 unsigned int npalen;
1686                 int r;
1687
1688                 r = s->ctx->next_protos_advertised_cb(s, &npa, &npalen, s->ctx->next_protos_advertised_cb_arg);
1689                 if (r == SSL_TLSEXT_ERR_OK)
1690                         {
1691                         if ((long)(limit - ret - 4 - npalen) < 0) return NULL;
1692                         s2n(TLSEXT_TYPE_next_proto_neg,ret);
1693                         s2n(npalen,ret);
1694                         memcpy(ret, npa, npalen);
1695                         ret += npalen;
1696                         s->s3->next_proto_neg_seen = 1;
1697                         }
1698                 }
1699 #endif
1700
1701         for (i = 0; i < s->ctx->custom_srv_ext_records_count; i++)
1702                 {
1703                 const unsigned char *out = NULL;
1704                 unsigned short outlen = 0;
1705                 int cb_retval = 0;
1706
1707                 record = &s->ctx->custom_srv_ext_records[i];
1708
1709                 /* NULL callback or -1 omits extension */
1710                 if (!record->fn2)
1711                         continue;
1712                 cb_retval = record->fn2(s, record->ext_type,
1713                                                                 &out, &outlen, al,
1714                                                                 record->arg);
1715                 if (cb_retval == 0)
1716                         return NULL; /* error */
1717                 if (cb_retval == -1)
1718                         continue; /* skip this extension */
1719                 if (limit < ret + 4 + outlen)
1720                         return NULL;
1721                 s2n(record->ext_type, ret);
1722                 s2n(outlen, ret);
1723                 memcpy(ret, out, outlen);
1724                 ret += outlen;
1725                 }
1726
1727         if (s->s3->alpn_selected)
1728                 {
1729                 const unsigned char *selected = s->s3->alpn_selected;
1730                 unsigned len = s->s3->alpn_selected_len;
1731
1732                 if ((long)(limit - ret - 4 - 2 - 1 - len) < 0)
1733                         return NULL;
1734                 s2n(TLSEXT_TYPE_application_layer_protocol_negotiation,ret);
1735                 s2n(3 + len,ret);
1736                 s2n(1 + len,ret);
1737                 *ret++ = len;
1738                 memcpy(ret, selected, len);
1739                 ret += len;
1740                 }
1741
1742         if ((extdatalen = ret-p-2)== 0)
1743                 return p;
1744
1745         s2n(extdatalen,p);
1746         return ret;
1747         }
1748
1749 #ifndef OPENSSL_NO_EC
1750 /* ssl_check_for_safari attempts to fingerprint Safari using OS X
1751  * SecureTransport using the TLS extension block in |d|, of length |n|.
1752  * Safari, since 10.6, sends exactly these extensions, in this order:
1753  *   SNI,
1754  *   elliptic_curves
1755  *   ec_point_formats
1756  *
1757  * We wish to fingerprint Safari because they broke ECDHE-ECDSA support in 10.8,
1758  * but they advertise support. So enabling ECDHE-ECDSA ciphers breaks them.
1759  * Sadly we cannot differentiate 10.6, 10.7 and 10.8.4 (which work), from
1760  * 10.8..10.8.3 (which don't work).
1761  */
1762 static void ssl_check_for_safari(SSL *s, const unsigned char *data, const unsigned char *d, int n) {
1763         unsigned short type, size;
1764         static const unsigned char kSafariExtensionsBlock[] = {
1765                 0x00, 0x0a,  /* elliptic_curves extension */
1766                 0x00, 0x08,  /* 8 bytes */
1767                 0x00, 0x06,  /* 6 bytes of curve ids */
1768                 0x00, 0x17,  /* P-256 */
1769                 0x00, 0x18,  /* P-384 */
1770                 0x00, 0x19,  /* P-521 */
1771
1772                 0x00, 0x0b,  /* ec_point_formats */
1773                 0x00, 0x02,  /* 2 bytes */
1774                 0x01,        /* 1 point format */
1775                 0x00,        /* uncompressed */
1776         };
1777
1778         /* The following is only present in TLS 1.2 */
1779         static const unsigned char kSafariTLS12ExtensionsBlock[] = {
1780                 0x00, 0x0d,  /* signature_algorithms */
1781                 0x00, 0x0c,  /* 12 bytes */
1782                 0x00, 0x0a,  /* 10 bytes */
1783                 0x05, 0x01,  /* SHA-384/RSA */
1784                 0x04, 0x01,  /* SHA-256/RSA */
1785                 0x02, 0x01,  /* SHA-1/RSA */
1786                 0x04, 0x03,  /* SHA-256/ECDSA */
1787                 0x02, 0x03,  /* SHA-1/ECDSA */
1788         };
1789
1790         if (data >= (d+n-2))
1791                 return;
1792         data += 2;
1793
1794         if (data > (d+n-4))
1795                 return;
1796         n2s(data,type);
1797         n2s(data,size);
1798
1799         if (type != TLSEXT_TYPE_server_name)
1800                 return;
1801
1802         if (data+size > d+n)
1803                 return;
1804         data += size;
1805
1806         if (TLS1_get_client_version(s) >= TLS1_2_VERSION)
1807                 {
1808                 const size_t len1 = sizeof(kSafariExtensionsBlock);
1809                 const size_t len2 = sizeof(kSafariTLS12ExtensionsBlock);
1810
1811                 if (data + len1 + len2 != d+n)
1812                         return;
1813                 if (memcmp(data, kSafariExtensionsBlock, len1) != 0)
1814                         return;
1815                 if (memcmp(data + len1, kSafariTLS12ExtensionsBlock, len2) != 0)
1816                         return;
1817                 }
1818         else
1819                 {
1820                 const size_t len = sizeof(kSafariExtensionsBlock);
1821
1822                 if (data + len != d+n)
1823                         return;
1824                 if (memcmp(data, kSafariExtensionsBlock, len) != 0)
1825                         return;
1826                 }
1827
1828         s->s3->is_probably_safari = 1;
1829 }
1830 #endif /* !OPENSSL_NO_EC */
1831
1832 /* tls1_alpn_handle_client_hello is called to process the ALPN extension in a
1833  * ClientHello.
1834  *   data: the contents of the extension, not including the type and length.
1835  *   data_len: the number of bytes in |data|
1836  *   al: a pointer to the alert value to send in the event of a non-zero
1837  *       return.
1838  *
1839  *   returns: 0 on success. */
1840 static int tls1_alpn_handle_client_hello(SSL *s, const unsigned char *data,
1841                                          unsigned data_len, int *al)
1842         {
1843         unsigned i;
1844         unsigned proto_len;
1845         const unsigned char *selected;
1846         unsigned char selected_len;
1847         int r;
1848
1849         if (s->ctx->alpn_select_cb == NULL)
1850                 return 0;
1851
1852         if (data_len < 2)
1853                 goto parse_error;
1854
1855         /* data should contain a uint16 length followed by a series of 8-bit,
1856          * length-prefixed strings. */
1857         i = ((unsigned) data[0]) << 8 |
1858             ((unsigned) data[1]);
1859         data_len -= 2;
1860         data += 2;
1861         if (data_len != i)
1862                 goto parse_error;
1863
1864         if (data_len < 2)
1865                 goto parse_error;
1866
1867         for (i = 0; i < data_len;)
1868                 {
1869                 proto_len = data[i];
1870                 i++;
1871
1872                 if (proto_len == 0)
1873                         goto parse_error;
1874
1875                 if (i + proto_len < i || i + proto_len > data_len)
1876                         goto parse_error;
1877
1878                 i += proto_len;
1879                 }
1880
1881         r = s->ctx->alpn_select_cb(s, &selected, &selected_len, data, data_len,
1882                                    s->ctx->alpn_select_cb_arg);
1883         if (r == SSL_TLSEXT_ERR_OK) {
1884                 if (s->s3->alpn_selected)
1885                         OPENSSL_free(s->s3->alpn_selected);
1886                 s->s3->alpn_selected = OPENSSL_malloc(selected_len);
1887                 if (!s->s3->alpn_selected)
1888                         {
1889                         *al = SSL_AD_INTERNAL_ERROR;
1890                         return -1;
1891                         }
1892                 memcpy(s->s3->alpn_selected, selected, selected_len);
1893                 s->s3->alpn_selected_len = selected_len;
1894         }
1895         return 0;
1896
1897 parse_error:
1898         *al = SSL_AD_DECODE_ERROR;
1899         return -1;
1900         }
1901
1902 static int ssl_scan_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al)
1903         {
1904         unsigned short type;
1905         unsigned short size;
1906         unsigned short len;
1907         unsigned char *data = *p;
1908         int renegotiate_seen = 0;
1909         size_t i;
1910
1911         s->servername_done = 0;
1912         s->tlsext_status_type = -1;
1913 #ifndef OPENSSL_NO_NEXTPROTONEG
1914         s->s3->next_proto_neg_seen = 0;
1915 #endif
1916
1917         /* Clear observed custom extensions */
1918         s->s3->serverinfo_client_tlsext_custom_types_count = 0;
1919         if (s->s3->serverinfo_client_tlsext_custom_types != NULL)
1920                 {
1921                 OPENSSL_free(s->s3->serverinfo_client_tlsext_custom_types);
1922                 s->s3->serverinfo_client_tlsext_custom_types = NULL;
1923                 }
1924
1925         if (s->s3->alpn_selected)
1926                 {
1927                 OPENSSL_free(s->s3->alpn_selected);
1928                 s->s3->alpn_selected = NULL;
1929                 }
1930
1931 #ifndef OPENSSL_NO_HEARTBEATS
1932         s->tlsext_heartbeat &= ~(SSL_TLSEXT_HB_ENABLED |
1933                                SSL_TLSEXT_HB_DONT_SEND_REQUESTS);
1934 #endif
1935
1936 #ifndef OPENSSL_NO_EC
1937         if (s->options & SSL_OP_SAFARI_ECDHE_ECDSA_BUG)
1938                 ssl_check_for_safari(s, data, d, n);
1939 #endif /* !OPENSSL_NO_EC */
1940
1941         /* Clear any signature algorithms extension received */
1942         if (s->cert->peer_sigalgs)
1943                 {
1944                 OPENSSL_free(s->cert->peer_sigalgs);
1945                 s->cert->peer_sigalgs = NULL;
1946                 }
1947         /* Clear any shared sigtnature algorithms */
1948         if (s->cert->shared_sigalgs)
1949                 {
1950                 OPENSSL_free(s->cert->shared_sigalgs);
1951                 s->cert->shared_sigalgs = NULL;
1952                 }
1953         /* Clear certificate digests and validity flags */
1954         for (i = 0; i < SSL_PKEY_NUM; i++)
1955                 {
1956                 s->cert->pkeys[i].digest = NULL;
1957                 s->cert->pkeys[i].valid_flags = 0;
1958                 }
1959
1960         if (data >= (d+n-2))
1961                 goto ri_check;
1962         n2s(data,len);
1963
1964         if (data > (d+n-len))
1965                 goto ri_check;
1966
1967         while (data <= (d+n-4))
1968                 {
1969                 n2s(data,type);
1970                 n2s(data,size);
1971
1972                 if (data+size > (d+n))
1973                         goto ri_check;
1974 #if 0
1975                 fprintf(stderr,"Received extension type %d size %d\n",type,size);
1976 #endif
1977                 if (s->tlsext_debug_cb)
1978                         s->tlsext_debug_cb(s, 0, type, data, size,
1979                                                 s->tlsext_debug_arg);
1980 /* The servername extension is treated as follows:
1981
1982    - Only the hostname type is supported with a maximum length of 255.
1983    - The servername is rejected if too long or if it contains zeros,
1984      in which case an fatal alert is generated.
1985    - The servername field is maintained together with the session cache.
1986    - When a session is resumed, the servername call back invoked in order
1987      to allow the application to position itself to the right context.
1988    - The servername is acknowledged if it is new for a session or when
1989      it is identical to a previously used for the same session.
1990      Applications can control the behaviour.  They can at any time
1991      set a 'desirable' servername for a new SSL object. This can be the
1992      case for example with HTTPS when a Host: header field is received and
1993      a renegotiation is requested. In this case, a possible servername
1994      presented in the new client hello is only acknowledged if it matches
1995      the value of the Host: field.
1996    - Applications must  use SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
1997      if they provide for changing an explicit servername context for the session,
1998      i.e. when the session has been established with a servername extension.
1999    - On session reconnect, the servername extension may be absent.
2000
2001 */
2002
2003                 if (type == TLSEXT_TYPE_server_name)
2004                         {
2005                         unsigned char *sdata;
2006                         int servname_type;
2007                         int dsize;
2008
2009                         if (size < 2)
2010                                 {
2011                                 *al = SSL_AD_DECODE_ERROR;
2012                                 return 0;
2013                                 }
2014                         n2s(data,dsize);
2015                         size -= 2;
2016                         if (dsize > size  )
2017                                 {
2018                                 *al = SSL_AD_DECODE_ERROR;
2019                                 return 0;
2020                                 }
2021
2022                         sdata = data;
2023                         while (dsize > 3)
2024                                 {
2025                                 servname_type = *(sdata++);
2026                                 n2s(sdata,len);
2027                                 dsize -= 3;
2028
2029                                 if (len > dsize)
2030                                         {
2031                                         *al = SSL_AD_DECODE_ERROR;
2032                                         return 0;
2033                                         }
2034                                 if (s->servername_done == 0)
2035                                 switch (servname_type)
2036                                         {
2037                                 case TLSEXT_NAMETYPE_host_name:
2038                                         if (!s->hit)
2039                                                 {
2040                                                 if(s->session->tlsext_hostname)
2041                                                         {
2042                                                         *al = SSL_AD_DECODE_ERROR;
2043                                                         return 0;
2044                                                         }
2045                                                 if (len > TLSEXT_MAXLEN_host_name)
2046                                                         {
2047                                                         *al = TLS1_AD_UNRECOGNIZED_NAME;
2048                                                         return 0;
2049                                                         }
2050                                                 if ((s->session->tlsext_hostname = OPENSSL_malloc(len+1)) == NULL)
2051                                                         {
2052                                                         *al = TLS1_AD_INTERNAL_ERROR;
2053                                                         return 0;
2054                                                         }
2055                                                 memcpy(s->session->tlsext_hostname, sdata, len);
2056                                                 s->session->tlsext_hostname[len]='\0';
2057                                                 if (strlen(s->session->tlsext_hostname) != len) {
2058                                                         OPENSSL_free(s->session->tlsext_hostname);
2059                                                         s->session->tlsext_hostname = NULL;
2060                                                         *al = TLS1_AD_UNRECOGNIZED_NAME;
2061                                                         return 0;
2062                                                 }
2063                                                 s->servername_done = 1;
2064
2065                                                 }
2066                                         else
2067                                                 s->servername_done = s->session->tlsext_hostname
2068                                                         && strlen(s->session->tlsext_hostname) == len
2069                                                         && strncmp(s->session->tlsext_hostname, (char *)sdata, len) == 0;
2070
2071                                         break;
2072
2073                                 default:
2074                                         break;
2075                                         }
2076
2077                                 dsize -= len;
2078                                 }
2079                         if (dsize != 0)
2080                                 {
2081                                 *al = SSL_AD_DECODE_ERROR;
2082                                 return 0;
2083                                 }
2084
2085                         }
2086 #ifndef OPENSSL_NO_SRP
2087                 else if (type == TLSEXT_TYPE_srp)
2088                         {
2089                         if (size <= 0 || ((len = data[0])) != (size -1))
2090                                 {
2091                                 *al = SSL_AD_DECODE_ERROR;
2092                                 return 0;
2093                                 }
2094                         if (s->srp_ctx.login != NULL)
2095                                 {
2096                                 *al = SSL_AD_DECODE_ERROR;
2097                                 return 0;
2098                                 }
2099                         if ((s->srp_ctx.login = OPENSSL_malloc(len+1)) == NULL)
2100                                 return -1;
2101                         memcpy(s->srp_ctx.login, &data[1], len);
2102                         s->srp_ctx.login[len]='\0';
2103
2104                         if (strlen(s->srp_ctx.login) != len)
2105                                 {
2106                                 *al = SSL_AD_DECODE_ERROR;
2107                                 return 0;
2108                                 }
2109                         }
2110 #endif
2111
2112 #ifndef OPENSSL_NO_EC
2113                 else if (type == TLSEXT_TYPE_ec_point_formats)
2114                         {
2115                         unsigned char *sdata = data;
2116                         int ecpointformatlist_length = *(sdata++);
2117
2118                         if (ecpointformatlist_length != size - 1 ||
2119                                 ecpointformatlist_length < 1)
2120                                 {
2121                                 *al = TLS1_AD_DECODE_ERROR;
2122                                 return 0;
2123                                 }
2124                         if (!s->hit)
2125                                 {
2126                                 if(s->session->tlsext_ecpointformatlist)
2127                                         {
2128                                         OPENSSL_free(s->session->tlsext_ecpointformatlist);
2129                                         s->session->tlsext_ecpointformatlist = NULL;
2130                                         }
2131                                 s->session->tlsext_ecpointformatlist_length = 0;
2132                                 if ((s->session->tlsext_ecpointformatlist = OPENSSL_malloc(ecpointformatlist_length)) == NULL)
2133                                         {
2134                                         *al = TLS1_AD_INTERNAL_ERROR;
2135                                         return 0;
2136                                         }
2137                                 s->session->tlsext_ecpointformatlist_length = ecpointformatlist_length;
2138                                 memcpy(s->session->tlsext_ecpointformatlist, sdata, ecpointformatlist_length);
2139                                 }
2140 #if 0
2141                         fprintf(stderr,"ssl_parse_clienthello_tlsext s->session->tlsext_ecpointformatlist (length=%i) ", s->session->tlsext_ecpointformatlist_length);
2142                         sdata = s->session->tlsext_ecpointformatlist;
2143                         for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
2144                                 fprintf(stderr,"%i ",*(sdata++));
2145                         fprintf(stderr,"\n");
2146 #endif
2147                         }
2148                 else if (type == TLSEXT_TYPE_elliptic_curves)
2149                         {
2150                         unsigned char *sdata = data;
2151                         int ellipticcurvelist_length = (*(sdata++) << 8);
2152                         ellipticcurvelist_length += (*(sdata++));
2153
2154                         if (ellipticcurvelist_length != size - 2 ||
2155                                 ellipticcurvelist_length < 1)
2156                                 {
2157                                 *al = TLS1_AD_DECODE_ERROR;
2158                                 return 0;
2159                                 }
2160                         if (!s->hit)
2161                                 {
2162                                 if(s->session->tlsext_ellipticcurvelist)
2163                                         {
2164                                         *al = TLS1_AD_DECODE_ERROR;
2165                                         return 0;
2166                                         }
2167                                 s->session->tlsext_ellipticcurvelist_length = 0;
2168                                 if ((s->session->tlsext_ellipticcurvelist = OPENSSL_malloc(ellipticcurvelist_length)) == NULL)
2169                                         {
2170                                         *al = TLS1_AD_INTERNAL_ERROR;
2171                                         return 0;
2172                                         }
2173                                 s->session->tlsext_ellipticcurvelist_length = ellipticcurvelist_length;
2174                                 memcpy(s->session->tlsext_ellipticcurvelist, sdata, ellipticcurvelist_length);
2175                                 }
2176 #if 0
2177                         fprintf(stderr,"ssl_parse_clienthello_tlsext s->session->tlsext_ellipticcurvelist (length=%i) ", s->session->tlsext_ellipticcurvelist_length);
2178                         sdata = s->session->tlsext_ellipticcurvelist;
2179                         for (i = 0; i < s->session->tlsext_ellipticcurvelist_length; i++)
2180                                 fprintf(stderr,"%i ",*(sdata++));
2181                         fprintf(stderr,"\n");
2182 #endif
2183                         }
2184 #endif /* OPENSSL_NO_EC */
2185 #ifdef TLSEXT_TYPE_opaque_prf_input
2186                 else if (type == TLSEXT_TYPE_opaque_prf_input)
2187                         {
2188                         unsigned char *sdata = data;
2189
2190                         if (size < 2)
2191                                 {
2192                                 *al = SSL_AD_DECODE_ERROR;
2193                                 return 0;
2194                                 }
2195                         n2s(sdata, s->s3->client_opaque_prf_input_len);
2196                         if (s->s3->client_opaque_prf_input_len != size - 2)
2197                                 {
2198                                 *al = SSL_AD_DECODE_ERROR;
2199                                 return 0;
2200                                 }
2201
2202                         if (s->s3->client_opaque_prf_input != NULL) /* shouldn't really happen */
2203                                 OPENSSL_free(s->s3->client_opaque_prf_input);
2204                         if (s->s3->client_opaque_prf_input_len == 0)
2205                                 s->s3->client_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
2206                         else
2207                                 s->s3->client_opaque_prf_input = BUF_memdup(sdata, s->s3->client_opaque_prf_input_len);
2208                         if (s->s3->client_opaque_prf_input == NULL)
2209                                 {
2210                                 *al = TLS1_AD_INTERNAL_ERROR;
2211                                 return 0;
2212                                 }
2213                         }
2214 #endif
2215                 else if (type == TLSEXT_TYPE_session_ticket)
2216                         {
2217                         if (s->tls_session_ticket_ext_cb &&
2218                             !s->tls_session_ticket_ext_cb(s, data, size, s->tls_session_ticket_ext_cb_arg))
2219                                 {
2220                                 *al = TLS1_AD_INTERNAL_ERROR;
2221                                 return 0;
2222                                 }
2223                         }
2224                 else if (type == TLSEXT_TYPE_renegotiate)
2225                         {
2226                         if(!ssl_parse_clienthello_renegotiate_ext(s, data, size, al))
2227                                 return 0;
2228                         renegotiate_seen = 1;
2229                         }
2230                 else if (type == TLSEXT_TYPE_signature_algorithms)
2231                         {
2232                         int dsize;
2233                         if (s->cert->peer_sigalgs || size < 2)
2234                                 {
2235                                 *al = SSL_AD_DECODE_ERROR;
2236                                 return 0;
2237                                 }
2238                         n2s(data,dsize);
2239                         size -= 2;
2240                         if (dsize != size || dsize & 1 || !dsize)
2241                                 {
2242                                 *al = SSL_AD_DECODE_ERROR;
2243                                 return 0;
2244                                 }
2245                         if (!tls1_process_sigalgs(s, data, dsize))
2246                                 {
2247                                 *al = SSL_AD_DECODE_ERROR;
2248                                 return 0;
2249                                 }
2250                         /* If sigalgs received and no shared algorithms fatal
2251                          * error.
2252                          */
2253                         if (s->cert->peer_sigalgs && !s->cert->shared_sigalgs)
2254                                 {
2255                                 SSLerr(SSL_F_SSL_SCAN_CLIENTHELLO_TLSEXT,
2256                                         SSL_R_NO_SHARED_SIGATURE_ALGORITHMS);
2257                                 *al = SSL_AD_ILLEGAL_PARAMETER;
2258                                 return 0;
2259                                 }
2260                         }
2261                 else if (type == TLSEXT_TYPE_status_request)
2262                         {
2263
2264                         if (size < 5)
2265                                 {
2266                                 *al = SSL_AD_DECODE_ERROR;
2267                                 return 0;
2268                                 }
2269
2270                         s->tlsext_status_type = *data++;
2271                         size--;
2272                         if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp)
2273                                 {
2274                                 const unsigned char *sdata;
2275                                 int dsize;
2276                                 /* Read in responder_id_list */
2277                                 n2s(data,dsize);
2278                                 size -= 2;
2279                                 if (dsize > size  )
2280                                         {
2281                                         *al = SSL_AD_DECODE_ERROR;
2282                                         return 0;
2283                                         }
2284                                 while (dsize > 0)
2285                                         {
2286                                         OCSP_RESPID *id;
2287                                         int idsize;
2288                                         if (dsize < 4)
2289                                                 {
2290                                                 *al = SSL_AD_DECODE_ERROR;
2291                                                 return 0;
2292                                                 }
2293                                         n2s(data, idsize);
2294                                         dsize -= 2 + idsize;
2295                                         size -= 2 + idsize;
2296                                         if (dsize < 0)
2297                                                 {
2298                                                 *al = SSL_AD_DECODE_ERROR;
2299                                                 return 0;
2300                                                 }
2301                                         sdata = data;
2302                                         data += idsize;
2303                                         id = d2i_OCSP_RESPID(NULL,
2304                                                                 &sdata, idsize);
2305                                         if (!id)
2306                                                 {
2307                                                 *al = SSL_AD_DECODE_ERROR;
2308                                                 return 0;
2309                                                 }
2310                                         if (data != sdata)
2311                                                 {
2312                                                 OCSP_RESPID_free(id);
2313                                                 *al = SSL_AD_DECODE_ERROR;
2314                                                 return 0;
2315                                                 }
2316                                         if (!s->tlsext_ocsp_ids
2317                                                 && !(s->tlsext_ocsp_ids =
2318                                                 sk_OCSP_RESPID_new_null()))
2319                                                 {
2320                                                 OCSP_RESPID_free(id);
2321                                                 *al = SSL_AD_INTERNAL_ERROR;
2322                                                 return 0;
2323                                                 }
2324                                         if (!sk_OCSP_RESPID_push(
2325                                                         s->tlsext_ocsp_ids, id))
2326                                                 {
2327                                                 OCSP_RESPID_free(id);
2328                                                 *al = SSL_AD_INTERNAL_ERROR;
2329                                                 return 0;
2330                                                 }
2331                                         }
2332
2333                                 /* Read in request_extensions */
2334                                 if (size < 2)
2335                                         {
2336                                         *al = SSL_AD_DECODE_ERROR;
2337                                         return 0;
2338                                         }
2339                                 n2s(data,dsize);
2340                                 size -= 2;
2341                                 if (dsize != size)
2342                                         {
2343                                         *al = SSL_AD_DECODE_ERROR;
2344                                         return 0;
2345                                         }
2346                                 sdata = data;
2347                                 if (dsize > 0)
2348                                         {
2349                                         if (s->tlsext_ocsp_exts)
2350                                                 {
2351                                                 sk_X509_EXTENSION_pop_free(s->tlsext_ocsp_exts,
2352                                                                            X509_EXTENSION_free);
2353                                                 }
2354
2355                                         s->tlsext_ocsp_exts =
2356                                                 d2i_X509_EXTENSIONS(NULL,
2357                                                         &sdata, dsize);
2358                                         if (!s->tlsext_ocsp_exts
2359                                                 || (data + dsize != sdata))
2360                                                 {
2361                                                 *al = SSL_AD_DECODE_ERROR;
2362                                                 return 0;
2363                                                 }
2364                                         }
2365                                 }
2366                                 /* We don't know what to do with any other type
2367                                 * so ignore it.
2368                                 */
2369                                 else
2370                                         s->tlsext_status_type = -1;
2371                         }
2372 #ifndef OPENSSL_NO_HEARTBEATS
2373                 else if (type == TLSEXT_TYPE_heartbeat)
2374                         {
2375                         switch(data[0])
2376                                 {
2377                                 case 0x01:      /* Client allows us to send HB requests */
2378                                                         s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED;
2379                                                         break;
2380                                 case 0x02:      /* Client doesn't accept HB requests */
2381                                                         s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED;
2382                                                         s->tlsext_heartbeat |= SSL_TLSEXT_HB_DONT_SEND_REQUESTS;
2383                                                         break;
2384                                 default:        *al = SSL_AD_ILLEGAL_PARAMETER;
2385                                                         return 0;
2386                                 }
2387                         }
2388 #endif
2389 #ifndef OPENSSL_NO_NEXTPROTONEG
2390                 else if (type == TLSEXT_TYPE_next_proto_neg &&
2391                          s->s3->tmp.finish_md_len == 0 &&
2392                          s->s3->alpn_selected == NULL)
2393                         {
2394                         /* We shouldn't accept this extension on a
2395                          * renegotiation.
2396                          *
2397                          * s->new_session will be set on renegotiation, but we
2398                          * probably shouldn't rely that it couldn't be set on
2399                          * the initial renegotation too in certain cases (when
2400                          * there's some other reason to disallow resuming an
2401                          * earlier session -- the current code won't be doing
2402                          * anything like that, but this might change).
2403
2404                          * A valid sign that there's been a previous handshake
2405                          * in this connection is if s->s3->tmp.finish_md_len >
2406                          * 0.  (We are talking about a check that will happen
2407                          * in the Hello protocol round, well before a new
2408                          * Finished message could have been computed.) */
2409                         s->s3->next_proto_neg_seen = 1;
2410                         }
2411 #endif
2412
2413                 else if (type == TLSEXT_TYPE_application_layer_protocol_negotiation &&
2414                          s->ctx->alpn_select_cb &&
2415                          s->s3->tmp.finish_md_len == 0)
2416                         {
2417                         if (tls1_alpn_handle_client_hello(s, data, size, al) != 0)
2418                                 return 0;
2419 #ifndef OPENSSL_NO_NEXTPROTONEG
2420                         /* ALPN takes precedence over NPN. */
2421                         s->s3->next_proto_neg_seen = 0;
2422 #endif
2423                         }
2424
2425                 /* session ticket processed earlier */
2426                 else if (type == TLSEXT_TYPE_use_srtp)
2427                         {
2428                         if(ssl_parse_clienthello_use_srtp_ext(s, data, size,
2429                                                               al))
2430                                 return 0;
2431                         }
2432                 /* If this ClientHello extension was unhandled and this is
2433                  * a nonresumed connection, check whether the extension is a
2434                  * custom TLS Extension (has a custom_srv_ext_record), and if
2435                  * so call the callback and record the extension number so that
2436                  * an appropriate ServerHello may be later returned.
2437                  */
2438                 else if (!s->hit && s->ctx->custom_srv_ext_records_count)
2439                         {
2440                         custom_srv_ext_record *record;
2441
2442                         for (i=0; i < s->ctx->custom_srv_ext_records_count; i++)
2443                                 {
2444                                 record = &s->ctx->custom_srv_ext_records[i];
2445                                 if (type == record->ext_type)
2446                                         {
2447                                         if (record->fn1 && !record->fn1(s, type, data, size, al, record->arg))
2448                                                 return 0;
2449                                         }
2450                                 }
2451                         }
2452
2453                 data+=size;
2454                 }
2455
2456         *p = data;
2457
2458         ri_check:
2459
2460         /* Need RI if renegotiating */
2461
2462         if (!renegotiate_seen && s->renegotiate &&
2463                 !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
2464                 {
2465                 *al = SSL_AD_HANDSHAKE_FAILURE;
2466                 SSLerr(SSL_F_SSL_SCAN_CLIENTHELLO_TLSEXT,
2467                                 SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
2468                 return 0;
2469                 }
2470         /* If no signature algorithms extension set default values */
2471         if (!s->cert->peer_sigalgs)
2472                 ssl_cert_set_default_md(s->cert);
2473
2474         return 1;
2475         }
2476
2477 int ssl_parse_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n)
2478         {
2479         int al = -1;
2480         if (ssl_scan_clienthello_tlsext(s, p, d, n, &al) <= 0)
2481                 {
2482                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2483                 return 0;
2484                 }
2485
2486         if (ssl_check_clienthello_tlsext_early(s) <= 0)
2487                 {
2488                 SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_TLSEXT,SSL_R_CLIENTHELLO_TLSEXT);
2489                 return 0;
2490                 }
2491         return 1;
2492 }
2493
2494 #ifndef OPENSSL_NO_NEXTPROTONEG
2495 /* ssl_next_proto_validate validates a Next Protocol Negotiation block. No
2496  * elements of zero length are allowed and the set of elements must exactly fill
2497  * the length of the block. */
2498 static char ssl_next_proto_validate(unsigned char *d, unsigned len)
2499         {
2500         unsigned int off = 0;
2501
2502         while (off < len)
2503                 {
2504                 if (d[off] == 0)
2505                         return 0;
2506                 off += d[off];
2507                 off++;
2508                 }
2509
2510         return off == len;
2511         }
2512 #endif
2513
2514 static int ssl_scan_serverhello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al)
2515         {
2516         unsigned short length;
2517         unsigned short type;
2518         unsigned short size;
2519         unsigned char *data = *p;
2520         int tlsext_servername = 0;
2521         int renegotiate_seen = 0;
2522
2523 #ifndef OPENSSL_NO_NEXTPROTONEG
2524         s->s3->next_proto_neg_seen = 0;
2525 #endif
2526
2527         if (s->s3->alpn_selected)
2528                 {
2529                 OPENSSL_free(s->s3->alpn_selected);
2530                 s->s3->alpn_selected = NULL;
2531                 }
2532
2533 #ifndef OPENSSL_NO_HEARTBEATS
2534         s->tlsext_heartbeat &= ~(SSL_TLSEXT_HB_ENABLED |
2535                                SSL_TLSEXT_HB_DONT_SEND_REQUESTS);
2536 #endif
2537
2538         if (data >= (d+n-2))
2539                 goto ri_check;
2540
2541         n2s(data,length);
2542         if (data+length != d+n)
2543                 {
2544                 *al = SSL_AD_DECODE_ERROR;
2545                 return 0;
2546                 }
2547
2548         while(data <= (d+n-4))
2549                 {
2550                 n2s(data,type);
2551                 n2s(data,size);
2552
2553                 if (data+size > (d+n))
2554                         goto ri_check;
2555
2556                 if (s->tlsext_debug_cb)
2557                         s->tlsext_debug_cb(s, 1, type, data, size,
2558                                                 s->tlsext_debug_arg);
2559
2560                 if (type == TLSEXT_TYPE_server_name)
2561                         {
2562                         if (s->tlsext_hostname == NULL || size > 0)
2563                                 {
2564                                 *al = TLS1_AD_UNRECOGNIZED_NAME;
2565                                 return 0;
2566                                 }
2567                         tlsext_servername = 1;
2568                         }
2569
2570 #ifndef OPENSSL_NO_EC
2571                 else if (type == TLSEXT_TYPE_ec_point_formats)
2572                         {
2573                         unsigned char *sdata = data;
2574                         int ecpointformatlist_length = *(sdata++);
2575
2576                         if (ecpointformatlist_length != size - 1)
2577                                 {
2578                                 *al = TLS1_AD_DECODE_ERROR;
2579                                 return 0;
2580                                 }
2581                         s->session->tlsext_ecpointformatlist_length = 0;
2582                         if (s->session->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->session->tlsext_ecpointformatlist);
2583                         if ((s->session->tlsext_ecpointformatlist = OPENSSL_malloc(ecpointformatlist_length)) == NULL)
2584                                 {
2585                                 *al = TLS1_AD_INTERNAL_ERROR;
2586                                 return 0;
2587                                 }
2588                         s->session->tlsext_ecpointformatlist_length = ecpointformatlist_length;
2589                         memcpy(s->session->tlsext_ecpointformatlist, sdata, ecpointformatlist_length);
2590 #if 0
2591                         fprintf(stderr,"ssl_parse_serverhello_tlsext s->session->tlsext_ecpointformatlist ");
2592                         sdata = s->session->tlsext_ecpointformatlist;
2593                         for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
2594                                 fprintf(stderr,"%i ",*(sdata++));
2595                         fprintf(stderr,"\n");
2596 #endif
2597                         }
2598 #endif /* OPENSSL_NO_EC */
2599
2600                 else if (type == TLSEXT_TYPE_session_ticket)
2601                         {
2602                         if (s->tls_session_ticket_ext_cb &&
2603                             !s->tls_session_ticket_ext_cb(s, data, size, s->tls_session_ticket_ext_cb_arg))
2604                                 {
2605                                 *al = TLS1_AD_INTERNAL_ERROR;
2606                                 return 0;
2607                                 }
2608                         if ((SSL_get_options(s) & SSL_OP_NO_TICKET)
2609                                 || (size > 0))
2610                                 {
2611                                 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
2612                                 return 0;
2613                                 }
2614                         s->tlsext_ticket_expected = 1;
2615                         }
2616 #ifdef TLSEXT_TYPE_opaque_prf_input
2617                 else if (type == TLSEXT_TYPE_opaque_prf_input)
2618                         {
2619                         unsigned char *sdata = data;
2620
2621                         if (size < 2)
2622                                 {
2623                                 *al = SSL_AD_DECODE_ERROR;
2624                                 return 0;
2625                                 }
2626                         n2s(sdata, s->s3->server_opaque_prf_input_len);
2627                         if (s->s3->server_opaque_prf_input_len != size - 2)
2628                                 {
2629                                 *al = SSL_AD_DECODE_ERROR;
2630                                 return 0;
2631                                 }
2632
2633                         if (s->s3->server_opaque_prf_input != NULL) /* shouldn't really happen */
2634                                 OPENSSL_free(s->s3->server_opaque_prf_input);
2635                         if (s->s3->server_opaque_prf_input_len == 0)
2636                                 s->s3->server_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
2637                         else
2638                                 s->s3->server_opaque_prf_input = BUF_memdup(sdata, s->s3->server_opaque_prf_input_len);
2639
2640                         if (s->s3->server_opaque_prf_input == NULL)
2641                                 {
2642                                 *al = TLS1_AD_INTERNAL_ERROR;
2643                                 return 0;
2644                                 }
2645                         }
2646 #endif
2647                 else if (type == TLSEXT_TYPE_status_request)
2648                         {
2649                         /* MUST be empty and only sent if we've requested
2650                          * a status request message.
2651                          */
2652                         if ((s->tlsext_status_type == -1) || (size > 0))
2653                                 {
2654                                 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
2655                                 return 0;
2656                                 }
2657                         /* Set flag to expect CertificateStatus message */
2658                         s->tlsext_status_expected = 1;
2659                         }
2660 #ifndef OPENSSL_NO_NEXTPROTONEG
2661                 else if (type == TLSEXT_TYPE_next_proto_neg &&
2662                          s->s3->tmp.finish_md_len == 0)
2663                         {
2664                         unsigned char *selected;
2665                         unsigned char selected_len;
2666
2667                         /* We must have requested it. */
2668                         if (s->ctx->next_proto_select_cb == NULL)
2669                                 {
2670                                 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
2671                                 return 0;
2672                                 }
2673                         /* The data must be valid */
2674                         if (!ssl_next_proto_validate(data, size))
2675                                 {
2676                                 *al = TLS1_AD_DECODE_ERROR;
2677                                 return 0;
2678                                 }
2679                         if (s->ctx->next_proto_select_cb(s, &selected, &selected_len, data, size, s->ctx->next_proto_select_cb_arg) != SSL_TLSEXT_ERR_OK)
2680                                 {
2681                                 *al = TLS1_AD_INTERNAL_ERROR;
2682                                 return 0;
2683                                 }
2684                         s->next_proto_negotiated = OPENSSL_malloc(selected_len);
2685                         if (!s->next_proto_negotiated)
2686                                 {
2687                                 *al = TLS1_AD_INTERNAL_ERROR;
2688                                 return 0;
2689                                 }
2690                         memcpy(s->next_proto_negotiated, selected, selected_len);
2691                         s->next_proto_negotiated_len = selected_len;
2692                         s->s3->next_proto_neg_seen = 1;
2693                         }
2694 #endif
2695
2696                 else if (type == TLSEXT_TYPE_application_layer_protocol_negotiation)
2697                         {
2698                         unsigned len;
2699
2700                         /* We must have requested it. */
2701                         if (s->alpn_client_proto_list == NULL)
2702                                 {
2703                                 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
2704                                 return 0;
2705                                 }
2706                         if (size < 4)
2707                                 {
2708                                 *al = TLS1_AD_DECODE_ERROR;
2709                                 return 0;
2710                                 }
2711                         /* The extension data consists of:
2712                          *   uint16 list_length
2713                          *   uint8 proto_length;
2714                          *   uint8 proto[proto_length]; */
2715                         len = data[0];
2716                         len <<= 8;
2717                         len |= data[1];
2718                         if (len != (unsigned) size - 2)
2719                                 {
2720                                 *al = TLS1_AD_DECODE_ERROR;
2721                                 return 0;
2722                                 }
2723                         len = data[2];
2724                         if (len != (unsigned) size - 3)
2725                                 {
2726                                 *al = TLS1_AD_DECODE_ERROR;
2727                                 return 0;
2728                                 }
2729                         if (s->s3->alpn_selected)
2730                                 OPENSSL_free(s->s3->alpn_selected);
2731                         s->s3->alpn_selected = OPENSSL_malloc(len);
2732                         if (!s->s3->alpn_selected)
2733                                 {
2734                                 *al = TLS1_AD_INTERNAL_ERROR;
2735                                 return 0;
2736                                 }
2737                         memcpy(s->s3->alpn_selected, data + 3, len);
2738                         s->s3->alpn_selected_len = len;
2739                         }
2740
2741                 else if (type == TLSEXT_TYPE_renegotiate)
2742                         {
2743                         if(!ssl_parse_serverhello_renegotiate_ext(s, data, size, al))
2744                                 return 0;
2745                         renegotiate_seen = 1;
2746                         }
2747 #ifndef OPENSSL_NO_HEARTBEATS
2748                 else if (type == TLSEXT_TYPE_heartbeat)
2749                         {
2750                         switch(data[0])
2751                                 {
2752                                 case 0x01:      /* Server allows us to send HB requests */
2753                                                         s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED;
2754                                                         break;
2755                                 case 0x02:      /* Server doesn't accept HB requests */
2756                                                         s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED;
2757                                                         s->tlsext_heartbeat |= SSL_TLSEXT_HB_DONT_SEND_REQUESTS;
2758                                                         break;
2759                                 default:        *al = SSL_AD_ILLEGAL_PARAMETER;
2760                                                         return 0;
2761                                 }
2762                         }
2763 #endif
2764                 else if (type == TLSEXT_TYPE_use_srtp)
2765                         {
2766                         if(ssl_parse_serverhello_use_srtp_ext(s, data, size,
2767                                                               al))
2768                                 return 0;
2769                         }
2770                 /* If this extension type was not otherwise handled, but
2771                  * matches a custom_cli_ext_record, then send it to the c
2772                  * callback */
2773                 else if (s->ctx->custom_cli_ext_records_count)
2774                         {
2775                         size_t i;
2776                         custom_cli_ext_record* record;
2777
2778                         for (i = 0; i < s->ctx->custom_cli_ext_records_count; i++)
2779                                 {
2780                                 record = &s->ctx->custom_cli_ext_records[i];
2781                                 if (record->ext_type == type)
2782                                         {
2783                                         if (record->fn2 && !record->fn2(s, type, data, size, al, record->arg))
2784                                                 return 0;
2785                                         break;
2786                                         }
2787                                 }
2788                         }
2789
2790                 data += size;
2791                 }
2792
2793         if (data != d+n)
2794                 {
2795                 *al = SSL_AD_DECODE_ERROR;
2796                 return 0;
2797                 }
2798
2799         if (!s->hit && tlsext_servername == 1)
2800                 {
2801                 if (s->tlsext_hostname)
2802                         {
2803                         if (s->session->tlsext_hostname == NULL)
2804                                 {
2805                                 s->session->tlsext_hostname = BUF_strdup(s->tlsext_hostname);
2806                                 if (!s->session->tlsext_hostname)
2807                                         {
2808                                         *al = SSL_AD_UNRECOGNIZED_NAME;
2809                                         return 0;
2810                                         }
2811                                 }
2812                         else
2813                                 {
2814                                 *al = SSL_AD_DECODE_ERROR;
2815                                 return 0;
2816                                 }
2817                         }
2818                 }
2819
2820         *p = data;
2821
2822         ri_check:
2823
2824         /* Determine if we need to see RI. Strictly speaking if we want to
2825          * avoid an attack we should *always* see RI even on initial server
2826          * hello because the client doesn't see any renegotiation during an
2827          * attack. However this would mean we could not connect to any server
2828          * which doesn't support RI so for the immediate future tolerate RI
2829          * absence on initial connect only.
2830          */
2831         if (!renegotiate_seen
2832                 && !(s->options & SSL_OP_LEGACY_SERVER_CONNECT)
2833                 && !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
2834                 {
2835                 *al = SSL_AD_HANDSHAKE_FAILURE;
2836                 SSLerr(SSL_F_SSL_SCAN_SERVERHELLO_TLSEXT,
2837                                 SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
2838                 return 0;
2839                 }
2840
2841         return 1;
2842         }
2843
2844
2845 int ssl_prepare_clienthello_tlsext(SSL *s)
2846         {
2847
2848 #ifdef TLSEXT_TYPE_opaque_prf_input
2849         {
2850                 int r = 1;
2851
2852                 if (s->ctx->tlsext_opaque_prf_input_callback != 0)
2853                         {
2854                         r = s->ctx->tlsext_opaque_prf_input_callback(s, NULL, 0, s->ctx->tlsext_opaque_prf_input_callback_arg);
2855                         if (!r)
2856                                 return -1;
2857                         }
2858
2859                 if (s->tlsext_opaque_prf_input != NULL)
2860                         {
2861                         if (s->s3->client_opaque_prf_input != NULL) /* shouldn't really happen */
2862                                 OPENSSL_free(s->s3->client_opaque_prf_input);
2863
2864                         if (s->tlsext_opaque_prf_input_len == 0)
2865                                 s->s3->client_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
2866                         else
2867                                 s->s3->client_opaque_prf_input = BUF_memdup(s->tlsext_opaque_prf_input, s->tlsext_opaque_prf_input_len);
2868                         if (s->s3->client_opaque_prf_input == NULL)
2869                                 {
2870                                 SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
2871                                 return -1;
2872                                 }
2873                         s->s3->client_opaque_prf_input_len = s->tlsext_opaque_prf_input_len;
2874                         }
2875
2876                 if (r == 2)
2877                         /* at callback's request, insist on receiving an appropriate server opaque PRF input */
2878                         s->s3->server_opaque_prf_input_len = s->tlsext_opaque_prf_input_len;
2879         }
2880 #endif
2881
2882         return 1;
2883         }
2884
2885 int ssl_prepare_serverhello_tlsext(SSL *s)
2886         {
2887         return 1;
2888         }
2889
2890 static int ssl_check_clienthello_tlsext_early(SSL *s)
2891         {
2892         int ret=SSL_TLSEXT_ERR_NOACK;
2893         int al = SSL_AD_UNRECOGNIZED_NAME;
2894
2895 #ifndef OPENSSL_NO_EC
2896         /* The handling of the ECPointFormats extension is done elsewhere, namely in
2897          * ssl3_choose_cipher in s3_lib.c.
2898          */
2899         /* The handling of the EllipticCurves extension is done elsewhere, namely in
2900          * ssl3_choose_cipher in s3_lib.c.
2901          */
2902 #endif
2903
2904         if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0)
2905                 ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg);
2906         else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0)
2907                 ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg);
2908
2909 #ifdef TLSEXT_TYPE_opaque_prf_input
2910         {
2911                 /* This sort of belongs into ssl_prepare_serverhello_tlsext(),
2912                  * but we might be sending an alert in response to the client hello,
2913                  * so this has to happen here in
2914                  * ssl_check_clienthello_tlsext_early(). */
2915
2916                 int r = 1;
2917
2918                 if (s->ctx->tlsext_opaque_prf_input_callback != 0)
2919                         {
2920                         r = s->ctx->tlsext_opaque_prf_input_callback(s, NULL, 0, s->ctx->tlsext_opaque_prf_input_callback_arg);
2921                         if (!r)
2922                                 {
2923                                 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2924                                 al = SSL_AD_INTERNAL_ERROR;
2925                                 goto err;
2926                                 }
2927                         }
2928
2929                 if (s->s3->server_opaque_prf_input != NULL) /* shouldn't really happen */
2930                         OPENSSL_free(s->s3->server_opaque_prf_input);
2931                 s->s3->server_opaque_prf_input = NULL;
2932
2933                 if (s->tlsext_opaque_prf_input != NULL)
2934                         {
2935                         if (s->s3->client_opaque_prf_input != NULL &&
2936                                 s->s3->client_opaque_prf_input_len == s->tlsext_opaque_prf_input_len)
2937                                 {
2938                                 /* can only use this extension if we have a server opaque PRF input
2939                                  * of the same length as the client opaque PRF input! */
2940
2941                                 if (s->tlsext_opaque_prf_input_len == 0)
2942                                         s->s3->server_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
2943                                 else
2944                                         s->s3->server_opaque_prf_input = BUF_memdup(s->tlsext_opaque_prf_input, s->tlsext_opaque_prf_input_len);
2945                                 if (s->s3->server_opaque_prf_input == NULL)
2946                                         {
2947                                         ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2948                                         al = SSL_AD_INTERNAL_ERROR;
2949                                         goto err;
2950                                         }
2951                                 s->s3->server_opaque_prf_input_len = s->tlsext_opaque_prf_input_len;
2952                                 }
2953                         }
2954
2955                 if (r == 2 && s->s3->server_opaque_prf_input == NULL)
2956                         {
2957                         /* The callback wants to enforce use of the extension,
2958                          * but we can't do that with the client opaque PRF input;
2959                          * abort the handshake.
2960                          */
2961                         ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2962                         al = SSL_AD_HANDSHAKE_FAILURE;
2963                         }
2964         }
2965
2966  err:
2967 #endif
2968         switch (ret)
2969                 {
2970                 case SSL_TLSEXT_ERR_ALERT_FATAL:
2971                         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2972                         return -1;
2973
2974                 case SSL_TLSEXT_ERR_ALERT_WARNING:
2975                         ssl3_send_alert(s,SSL3_AL_WARNING,al);
2976                         return 1;
2977
2978                 case SSL_TLSEXT_ERR_NOACK:
2979                         s->servername_done=0;
2980                         default:
2981                 return 1;
2982                 }
2983         }
2984
2985 int ssl_check_clienthello_tlsext_late(SSL *s)
2986         {
2987         int ret = SSL_TLSEXT_ERR_OK;
2988         int al;
2989
2990         /* If status request then ask callback what to do.
2991          * Note: this must be called after servername callbacks in case
2992          * the certificate has changed, and must be called after the cipher
2993          * has been chosen because this may influence which certificate is sent
2994          */
2995         if ((s->tlsext_status_type != -1) && s->ctx && s->ctx->tlsext_status_cb)
2996                 {
2997                 int r;
2998                 CERT_PKEY *certpkey;
2999                 certpkey = ssl_get_server_send_pkey(s);
3000                 /* If no certificate can't return certificate status */
3001                 if (certpkey == NULL)
3002                         {
3003                         s->tlsext_status_expected = 0;
3004                         return 1;
3005                         }
3006                 /* Set current certificate to one we will use so
3007                  * SSL_get_certificate et al can pick it up.
3008                  */
3009                 s->cert->key = certpkey;
3010                 r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
3011                 switch (r)
3012                         {
3013                         /* We don't want to send a status request response */
3014                         case SSL_TLSEXT_ERR_NOACK:
3015                                 s->tlsext_status_expected = 0;
3016                                 break;
3017                         /* status request response should be sent */
3018                         case SSL_TLSEXT_ERR_OK:
3019                                 if (s->tlsext_ocsp_resp)
3020                                         s->tlsext_status_expected = 1;
3021                                 else
3022                                         s->tlsext_status_expected = 0;
3023                                 break;
3024                         /* something bad happened */
3025                         case SSL_TLSEXT_ERR_ALERT_FATAL:
3026                                 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
3027                                 al = SSL_AD_INTERNAL_ERROR;
3028                                 goto err;
3029                         }
3030                 }
3031         else
3032                 s->tlsext_status_expected = 0;
3033
3034  err:
3035         switch (ret)
3036                 {
3037                 case SSL_TLSEXT_ERR_ALERT_FATAL:
3038                         ssl3_send_alert(s, SSL3_AL_FATAL, al);
3039                         return -1;
3040
3041                 case SSL_TLSEXT_ERR_ALERT_WARNING:
3042                         ssl3_send_alert(s, SSL3_AL_WARNING, al);
3043                         return 1;
3044
3045                 default:
3046                         return 1;
3047                 }
3048         }
3049
3050 int ssl_check_serverhello_tlsext(SSL *s)
3051         {
3052         int ret=SSL_TLSEXT_ERR_NOACK;
3053         int al = SSL_AD_UNRECOGNIZED_NAME;
3054
3055 #ifndef OPENSSL_NO_EC
3056         /* If we are client and using an elliptic curve cryptography cipher
3057          * suite, then if server returns an EC point formats lists extension
3058          * it must contain uncompressed.
3059          */
3060         unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
3061         unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth;
3062         if ((s->tlsext_ecpointformatlist != NULL) && (s->tlsext_ecpointformatlist_length > 0) &&
3063             (s->session->tlsext_ecpointformatlist != NULL) && (s->session->tlsext_ecpointformatlist_length > 0) &&
3064             ((alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) || (alg_a & SSL_aECDSA)))
3065                 {
3066                 /* we are using an ECC cipher */
3067                 size_t i;
3068                 unsigned char *list;
3069                 int found_uncompressed = 0;
3070                 list = s->session->tlsext_ecpointformatlist;
3071                 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
3072                         {
3073                         if (*(list++) == TLSEXT_ECPOINTFORMAT_uncompressed)
3074                                 {
3075                                 found_uncompressed = 1;
3076                                 break;
3077                                 }
3078                         }
3079                 if (!found_uncompressed)
3080                         {
3081                         SSLerr(SSL_F_SSL_CHECK_SERVERHELLO_TLSEXT,SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST);
3082                         return -1;
3083                         }
3084                 }
3085         ret = SSL_TLSEXT_ERR_OK;
3086 #endif /* OPENSSL_NO_EC */
3087
3088         if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0)
3089                 ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg);
3090         else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0)
3091                 ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg);
3092
3093 #ifdef TLSEXT_TYPE_opaque_prf_input
3094         if (s->s3->server_opaque_prf_input_len > 0)
3095                 {
3096                 /* This case may indicate that we, as a client, want to insist on using opaque PRF inputs.
3097                  * So first verify that we really have a value from the server too. */
3098
3099                 if (s->s3->server_opaque_prf_input == NULL)
3100                         {
3101                         ret = SSL_TLSEXT_ERR_ALERT_FATAL;
3102                         al = SSL_AD_HANDSHAKE_FAILURE;
3103                         }
3104
3105                 /* Anytime the server *has* sent an opaque PRF input, we need to check
3106                  * that we have a client opaque PRF input of the same size. */
3107                 if (s->s3->client_opaque_prf_input == NULL ||
3108                     s->s3->client_opaque_prf_input_len != s->s3->server_opaque_prf_input_len)
3109                         {
3110                         ret = SSL_TLSEXT_ERR_ALERT_FATAL;
3111                         al = SSL_AD_ILLEGAL_PARAMETER;
3112                         }
3113                 }
3114 #endif
3115
3116         /* If we've requested certificate status and we wont get one
3117          * tell the callback
3118          */
3119         if ((s->tlsext_status_type != -1) && !(s->tlsext_status_expected)
3120                         && s->ctx && s->ctx->tlsext_status_cb)
3121                 {
3122                 int r;
3123                 /* Set resp to NULL, resplen to -1 so callback knows
3124                  * there is no response.
3125                  */
3126                 if (s->tlsext_ocsp_resp)
3127                         {
3128                         OPENSSL_free(s->tlsext_ocsp_resp);
3129                         s->tlsext_ocsp_resp = NULL;
3130                         }
3131                 s->tlsext_ocsp_resplen = -1;
3132                 r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
3133                 if (r == 0)
3134                         {
3135                         al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
3136                         ret = SSL_TLSEXT_ERR_ALERT_FATAL;
3137                         }
3138                 if (r < 0)
3139                         {
3140                         al = SSL_AD_INTERNAL_ERROR;
3141                         ret = SSL_TLSEXT_ERR_ALERT_FATAL;
3142                         }
3143                 }
3144
3145         switch (ret)
3146                 {
3147                 case SSL_TLSEXT_ERR_ALERT_FATAL:
3148                         ssl3_send_alert(s,SSL3_AL_FATAL,al);
3149                         return -1;
3150
3151                 case SSL_TLSEXT_ERR_ALERT_WARNING:
3152                         ssl3_send_alert(s,SSL3_AL_WARNING,al);
3153                         return 1;
3154
3155                 case SSL_TLSEXT_ERR_NOACK:
3156                         s->servername_done=0;
3157                         default:
3158                 return 1;
3159                 }
3160         }
3161
3162 int ssl_parse_serverhello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n)
3163         {
3164         int al = -1;
3165         if (s->version < SSL3_VERSION)
3166                 return 1;
3167         if (ssl_scan_serverhello_tlsext(s, p, d, n, &al) <= 0)
3168                 {
3169                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
3170                 return 0;
3171                 }
3172
3173         if (ssl_check_serverhello_tlsext(s) <= 0)
3174                 {
3175                 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_TLSEXT,SSL_R_SERVERHELLO_TLSEXT);
3176                 return 0;
3177                 }
3178         return 1;
3179 }
3180
3181 /* Since the server cache lookup is done early on in the processing of the
3182  * ClientHello, and other operations depend on the result, we need to handle
3183  * any TLS session ticket extension at the same time.
3184  *
3185  *   session_id: points at the session ID in the ClientHello. This code will
3186  *       read past the end of this in order to parse out the session ticket
3187  *       extension, if any.
3188  *   len: the length of the session ID.
3189  *   limit: a pointer to the first byte after the ClientHello.
3190  *   ret: (output) on return, if a ticket was decrypted, then this is set to
3191  *       point to the resulting session.
3192  *
3193  * If s->tls_session_secret_cb is set then we are expecting a pre-shared key
3194  * ciphersuite, in which case we have no use for session tickets and one will
3195  * never be decrypted, nor will s->tlsext_ticket_expected be set to 1.
3196  *
3197  * Returns:
3198  *   -1: fatal error, either from parsing or decrypting the ticket.
3199  *    0: no ticket was found (or was ignored, based on settings).
3200  *    1: a zero length extension was found, indicating that the client supports
3201  *       session tickets but doesn't currently have one to offer.
3202  *    2: either s->tls_session_secret_cb was set, or a ticket was offered but
3203  *       couldn't be decrypted because of a non-fatal error.
3204  *    3: a ticket was successfully decrypted and *ret was set.
3205  *
3206  * Side effects:
3207  *   Sets s->tlsext_ticket_expected to 1 if the server will have to issue
3208  *   a new session ticket to the client because the client indicated support
3209  *   (and s->tls_session_secret_cb is NULL) but the client either doesn't have
3210  *   a session ticket or we couldn't use the one it gave us, or if
3211  *   s->ctx->tlsext_ticket_key_cb asked to renew the client's ticket.
3212  *   Otherwise, s->tlsext_ticket_expected is set to 0.
3213  */
3214 int tls1_process_ticket(SSL *s, unsigned char *session_id, int len,
3215                         const unsigned char *limit, SSL_SESSION **ret)
3216         {
3217         /* Point after session ID in client hello */
3218         const unsigned char *p = session_id + len;
3219         unsigned short i;
3220
3221         *ret = NULL;
3222         s->tlsext_ticket_expected = 0;
3223
3224         /* If tickets disabled behave as if no ticket present
3225          * to permit stateful resumption.
3226          */
3227         if (SSL_get_options(s) & SSL_OP_NO_TICKET)
3228                 return 0;
3229         if ((s->version <= SSL3_VERSION) || !limit)
3230                 return 0;
3231         if (p >= limit)
3232                 return -1;
3233         /* Skip past DTLS cookie */
3234         if (SSL_IS_DTLS(s))
3235                 {
3236                 i = *(p++);
3237                 p+= i;
3238                 if (p >= limit)
3239                         return -1;
3240                 }
3241         /* Skip past cipher list */
3242         n2s(p, i);
3243         p+= i;
3244         if (p >= limit)
3245                 return -1;
3246         /* Skip past compression algorithm list */
3247         i = *(p++);
3248         p += i;
3249         if (p > limit)
3250                 return -1;
3251         /* Now at start of extensions */
3252         if ((p + 2) >= limit)
3253                 return 0;
3254         n2s(p, i);
3255         while ((p + 4) <= limit)
3256                 {
3257                 unsigned short type, size;
3258                 n2s(p, type);
3259                 n2s(p, size);
3260                 if (p + size > limit)
3261                         return 0;
3262                 if (type == TLSEXT_TYPE_session_ticket)
3263                         {
3264                         int r;
3265                         if (size == 0)
3266                                 {
3267                                 /* The client will accept a ticket but doesn't
3268                                  * currently have one. */
3269                                 s->tlsext_ticket_expected = 1;
3270                                 return 1;
3271                                 }
3272                         if (s->tls_session_secret_cb)
3273                                 {
3274                                 /* Indicate that the ticket couldn't be
3275                                  * decrypted rather than generating the session
3276                                  * from ticket now, trigger abbreviated
3277                                  * handshake based on external mechanism to
3278                                  * calculate the master secret later. */
3279                                 return 2;
3280                                 }
3281                         r = tls_decrypt_ticket(s, p, size, session_id, len, ret);
3282                         switch (r)
3283                                 {
3284                                 case 2: /* ticket couldn't be decrypted */
3285                                         s->tlsext_ticket_expected = 1;
3286                                         return 2;
3287                                 case 3: /* ticket was decrypted */
3288                                         return r;
3289                                 case 4: /* ticket decrypted but need to renew */
3290                                         s->tlsext_ticket_expected = 1;
3291                                         return 3;
3292                                 default: /* fatal error */
3293                                         return -1;
3294                                 }
3295                         }
3296                 p += size;
3297                 }
3298         return 0;
3299         }
3300
3301 /* tls_decrypt_ticket attempts to decrypt a session ticket.
3302  *
3303  *   etick: points to the body of the session ticket extension.
3304  *   eticklen: the length of the session tickets extenion.
3305  *   sess_id: points at the session ID.
3306  *   sesslen: the length of the session ID.
3307  *   psess: (output) on return, if a ticket was decrypted, then this is set to
3308  *       point to the resulting session.
3309  *
3310  * Returns:
3311  *   -1: fatal error, either from parsing or decrypting the ticket.
3312  *    2: the ticket couldn't be decrypted.
3313  *    3: a ticket was successfully decrypted and *psess was set.
3314  *    4: same as 3, but the ticket needs to be renewed.
3315  */
3316 static int tls_decrypt_ticket(SSL *s, const unsigned char *etick, int eticklen,
3317                                 const unsigned char *sess_id, int sesslen,
3318                                 SSL_SESSION **psess)
3319         {
3320         SSL_SESSION *sess;
3321         unsigned char *sdec;
3322         const unsigned char *p;
3323         int slen, mlen, renew_ticket = 0;
3324         unsigned char tick_hmac[EVP_MAX_MD_SIZE];
3325         HMAC_CTX hctx;
3326         EVP_CIPHER_CTX ctx;
3327         SSL_CTX *tctx = s->initial_ctx;
3328         /* Need at least keyname + iv + some encrypted data */
3329         if (eticklen < 48)
3330                 return 2;
3331         /* Initialize session ticket encryption and HMAC contexts */
3332         HMAC_CTX_init(&hctx);
3333         EVP_CIPHER_CTX_init(&ctx);
3334         if (tctx->tlsext_ticket_key_cb)
3335                 {
3336                 unsigned char *nctick = (unsigned char *)etick;
3337                 int rv = tctx->tlsext_ticket_key_cb(s, nctick, nctick + 16,
3338                                                         &ctx, &hctx, 0);
3339                 if (rv < 0)
3340                         return -1;
3341                 if (rv == 0)
3342                         return 2;
3343                 if (rv == 2)
3344                         renew_ticket = 1;
3345                 }
3346         else
3347                 {
3348                 /* Check key name matches */
3349                 if (memcmp(etick, tctx->tlsext_tick_key_name, 16))
3350                         return 2;
3351                 HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
3352                                         tlsext_tick_md(), NULL);
3353                 EVP_DecryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
3354                                 tctx->tlsext_tick_aes_key, etick + 16);
3355                 }
3356         /* Attempt to process session ticket, first conduct sanity and
3357          * integrity checks on ticket.
3358          */
3359         mlen = HMAC_size(&hctx);
3360         if (mlen < 0)
3361                 {
3362                 EVP_CIPHER_CTX_cleanup(&ctx);
3363                 return -1;
3364                 }
3365         eticklen -= mlen;
3366         /* Check HMAC of encrypted ticket */
3367         HMAC_Update(&hctx, etick, eticklen);
3368         HMAC_Final(&hctx, tick_hmac, NULL);
3369         HMAC_CTX_cleanup(&hctx);
3370         if (CRYPTO_memcmp(tick_hmac, etick + eticklen, mlen))
3371                 return 2;
3372         /* Attempt to decrypt session data */
3373         /* Move p after IV to start of encrypted ticket, update length */
3374         p = etick + 16 + EVP_CIPHER_CTX_iv_length(&ctx);
3375         eticklen -= 16 + EVP_CIPHER_CTX_iv_length(&ctx);
3376         sdec = OPENSSL_malloc(eticklen);
3377         if (!sdec)
3378                 {
3379                 EVP_CIPHER_CTX_cleanup(&ctx);
3380                 return -1;
3381                 }
3382         EVP_DecryptUpdate(&ctx, sdec, &slen, p, eticklen);
3383         if (EVP_DecryptFinal(&ctx, sdec + slen, &mlen) <= 0)
3384                 return 2;
3385         slen += mlen;
3386         EVP_CIPHER_CTX_cleanup(&ctx);
3387         p = sdec;
3388
3389         sess = d2i_SSL_SESSION(NULL, &p, slen);
3390         OPENSSL_free(sdec);
3391         if (sess)
3392                 {
3393                 /* The session ID, if non-empty, is used by some clients to
3394                  * detect that the ticket has been accepted. So we copy it to
3395                  * the session structure. If it is empty set length to zero
3396                  * as required by standard.
3397                  */
3398                 if (sesslen)
3399                         memcpy(sess->session_id, sess_id, sesslen);
3400                 sess->session_id_length = sesslen;
3401                 *psess = sess;
3402                 if (renew_ticket)
3403                         return 4;
3404                 else
3405                         return 3;
3406                 }
3407         ERR_clear_error();
3408         /* For session parse failure, indicate that we need to send a new
3409          * ticket. */
3410         return 2;
3411         }
3412
3413 /* Tables to translate from NIDs to TLS v1.2 ids */
3414
3415 typedef struct
3416         {
3417         int nid;
3418         int id;
3419         } tls12_lookup;
3420
3421 static tls12_lookup tls12_md[] = {
3422         {NID_md5, TLSEXT_hash_md5},
3423         {NID_sha1, TLSEXT_hash_sha1},
3424         {NID_sha224, TLSEXT_hash_sha224},
3425         {NID_sha256, TLSEXT_hash_sha256},
3426         {NID_sha384, TLSEXT_hash_sha384},
3427         {NID_sha512, TLSEXT_hash_sha512}
3428 };
3429
3430 static tls12_lookup tls12_sig[] = {
3431         {EVP_PKEY_RSA, TLSEXT_signature_rsa},
3432         {EVP_PKEY_DSA, TLSEXT_signature_dsa},
3433         {EVP_PKEY_EC, TLSEXT_signature_ecdsa}
3434 };
3435
3436 static int tls12_find_id(int nid, tls12_lookup *table, size_t tlen)
3437         {
3438         size_t i;
3439         for (i = 0; i < tlen; i++)
3440                 {
3441                 if (table[i].nid == nid)
3442                         return table[i].id;
3443                 }
3444         return -1;
3445         }
3446
3447 static int tls12_find_nid(int id, tls12_lookup *table, size_t tlen)
3448         {
3449         size_t i;
3450         for (i = 0; i < tlen; i++)
3451                 {
3452                 if ((table[i].id) == id)
3453                         return table[i].nid;
3454                 }
3455         return NID_undef;
3456         }
3457
3458 int tls12_get_sigandhash(unsigned char *p, const EVP_PKEY *pk, const EVP_MD *md)
3459         {
3460         int sig_id, md_id;
3461         if (!md)
3462                 return 0;
3463         md_id = tls12_find_id(EVP_MD_type(md), tls12_md,
3464                                 sizeof(tls12_md)/sizeof(tls12_lookup));
3465         if (md_id == -1)
3466                 return 0;
3467         sig_id = tls12_get_sigid(pk);
3468         if (sig_id == -1)
3469                 return 0;
3470         p[0] = (unsigned char)md_id;
3471         p[1] = (unsigned char)sig_id;
3472         return 1;
3473         }
3474
3475 int tls12_get_sigid(const EVP_PKEY *pk)
3476         {
3477         return tls12_find_id(pk->type, tls12_sig,
3478                                 sizeof(tls12_sig)/sizeof(tls12_lookup));
3479         }
3480
3481 const EVP_MD *tls12_get_hash(unsigned char hash_alg)
3482         {
3483         switch(hash_alg)
3484                 {
3485 #ifndef OPENSSL_NO_MD5
3486                 case TLSEXT_hash_md5:
3487 #ifdef OPENSSL_FIPS
3488                 if (FIPS_mode())
3489                         return NULL;
3490 #endif
3491                 return EVP_md5();
3492 #endif
3493 #ifndef OPENSSL_NO_SHA
3494                 case TLSEXT_hash_sha1:
3495                 return EVP_sha1();
3496 #endif
3497 #ifndef OPENSSL_NO_SHA256
3498                 case TLSEXT_hash_sha224:
3499                 return EVP_sha224();
3500
3501                 case TLSEXT_hash_sha256:
3502                 return EVP_sha256();
3503 #endif
3504 #ifndef OPENSSL_NO_SHA512
3505                 case TLSEXT_hash_sha384:
3506                 return EVP_sha384();
3507
3508                 case TLSEXT_hash_sha512:
3509                 return EVP_sha512();
3510 #endif
3511                 default:
3512                 return NULL;
3513
3514                 }
3515         }
3516
3517 static int tls12_get_pkey_idx(unsigned char sig_alg)
3518         {
3519         switch(sig_alg)
3520                 {
3521 #ifndef OPENSSL_NO_RSA
3522         case TLSEXT_signature_rsa:
3523                 return SSL_PKEY_RSA_SIGN;
3524 #endif
3525 #ifndef OPENSSL_NO_DSA
3526         case TLSEXT_signature_dsa:
3527                 return SSL_PKEY_DSA_SIGN;
3528 #endif
3529 #ifndef OPENSSL_NO_ECDSA
3530         case TLSEXT_signature_ecdsa:
3531                 return SSL_PKEY_ECC;
3532 #endif
3533                 }
3534         return -1;
3535         }
3536
3537 /* Convert TLS 1.2 signature algorithm extension values into NIDs */
3538 static void tls1_lookup_sigalg(int *phash_nid, int *psign_nid,
3539                         int *psignhash_nid, const unsigned char *data)
3540         {
3541         int sign_nid = 0, hash_nid = 0;
3542         if (!phash_nid && !psign_nid && !psignhash_nid)
3543                 return;
3544         if (phash_nid || psignhash_nid)
3545                 {
3546                 hash_nid = tls12_find_nid(data[0], tls12_md,
3547                                         sizeof(tls12_md)/sizeof(tls12_lookup));
3548                 if (phash_nid)
3549                         *phash_nid = hash_nid;
3550                 }
3551         if (psign_nid || psignhash_nid)
3552                 {
3553                 sign_nid = tls12_find_nid(data[1], tls12_sig,
3554                                         sizeof(tls12_sig)/sizeof(tls12_lookup));
3555                 if (psign_nid)
3556                         *psign_nid = sign_nid;
3557                 }
3558         if (psignhash_nid)
3559                 {
3560                 if (sign_nid && hash_nid)
3561                         OBJ_find_sigid_by_algs(psignhash_nid,
3562                                                         hash_nid, sign_nid);
3563                 else
3564                         *psignhash_nid = NID_undef;
3565                 }
3566         }
3567 /* Given preference and allowed sigalgs set shared sigalgs */
3568 static int tls12_do_shared_sigalgs(TLS_SIGALGS *shsig,
3569                                 const unsigned char *pref, size_t preflen,
3570                                 const unsigned char *allow, size_t allowlen)
3571         {
3572         const unsigned char *ptmp, *atmp;
3573         size_t i, j, nmatch = 0;
3574         for (i = 0, ptmp = pref; i < preflen; i+=2, ptmp+=2)
3575                 {
3576                 /* Skip disabled hashes or signature algorithms */
3577                 if (tls12_get_hash(ptmp[0]) == NULL)
3578                         continue;
3579                 if (tls12_get_pkey_idx(ptmp[1]) == -1)
3580                         continue;
3581                 for (j = 0, atmp = allow; j < allowlen; j+=2, atmp+=2)
3582                         {
3583                         if (ptmp[0] == atmp[0] && ptmp[1] == atmp[1])
3584                                 {
3585                                 nmatch++;
3586                                 if (shsig)
3587                                         {
3588                                         shsig->rhash = ptmp[0];
3589                                         shsig->rsign = ptmp[1];
3590                                         tls1_lookup_sigalg(&shsig->hash_nid,
3591                                                 &shsig->sign_nid,
3592                                                 &shsig->signandhash_nid,
3593                                                 ptmp);
3594                                         shsig++;
3595                                         }
3596                                 break;
3597                                 }
3598                         }
3599                 }
3600         return nmatch;
3601         }
3602
3603 /* Set shared signature algorithms for SSL structures */
3604 static int tls1_set_shared_sigalgs(SSL *s)
3605         {
3606         const unsigned char *pref, *allow, *conf;
3607         size_t preflen, allowlen, conflen;
3608         size_t nmatch;
3609         TLS_SIGALGS *salgs = NULL;
3610         CERT *c = s->cert;
3611         unsigned int is_suiteb = tls1_suiteb(s);
3612         if (c->shared_sigalgs)
3613                 {
3614                 OPENSSL_free(c->shared_sigalgs);
3615                 c->shared_sigalgs = NULL;
3616                 }
3617         /* If client use client signature algorithms if not NULL */
3618         if (!s->server && c->client_sigalgs && !is_suiteb)
3619                 {
3620                 conf = c->client_sigalgs;
3621                 conflen = c->client_sigalgslen;
3622                 }
3623         else if (c->conf_sigalgs && !is_suiteb)
3624                 {
3625                 conf = c->conf_sigalgs;
3626                 conflen = c->conf_sigalgslen;
3627                 }
3628         else
3629                 conflen = tls12_get_psigalgs(s, &conf);
3630         if(s->options & SSL_OP_CIPHER_SERVER_PREFERENCE || is_suiteb)
3631                 {
3632                 pref = conf;
3633                 preflen = conflen;
3634                 allow = c->peer_sigalgs;
3635                 allowlen = c->peer_sigalgslen;
3636                 }
3637         else
3638                 {
3639                 allow = conf;
3640                 allowlen = conflen;
3641                 pref = c->peer_sigalgs;
3642                 preflen = c->peer_sigalgslen;
3643                 }
3644         nmatch = tls12_do_shared_sigalgs(NULL, pref, preflen, allow, allowlen);
3645         if (!nmatch)
3646                 return 1;
3647         salgs = OPENSSL_malloc(nmatch * sizeof(TLS_SIGALGS));
3648         if (!salgs)
3649                 return 0;
3650         nmatch = tls12_do_shared_sigalgs(salgs, pref, preflen, allow, allowlen);
3651         c->shared_sigalgs = salgs;
3652         c->shared_sigalgslen = nmatch;
3653         return 1;
3654         }
3655
3656
3657 /* Set preferred digest for each key type */
3658
3659 int tls1_process_sigalgs(SSL *s, const unsigned char *data, int dsize)
3660         {
3661         int idx;
3662         size_t i;
3663         const EVP_MD *md;
3664         CERT *c = s->cert;
3665         TLS_SIGALGS *sigptr;
3666         /* Extension ignored for inappropriate versions */
3667         if (!SSL_USE_SIGALGS(s))
3668                 return 1;
3669         /* Should never happen */
3670         if (!c)
3671                 return 0;
3672
3673         if (c->peer_sigalgs)
3674                 OPENSSL_free(c->peer_sigalgs);
3675         c->peer_sigalgs = OPENSSL_malloc(dsize);
3676         if (!c->peer_sigalgs)
3677                 return 0;
3678         c->peer_sigalgslen = dsize;
3679         memcpy(c->peer_sigalgs, data, dsize);
3680
3681         tls1_set_shared_sigalgs(s);
3682
3683 #ifdef OPENSSL_SSL_DEBUG_BROKEN_PROTOCOL
3684         if (s->cert->cert_flags & SSL_CERT_FLAG_BROKEN_PROTOCOL)
3685                 {
3686                 /* Use first set signature preference to force message
3687                  * digest, ignoring any peer preferences.
3688                  */
3689                 const unsigned char *sigs = NULL;
3690                 if (s->server)
3691                         sigs = c->conf_sigalgs;
3692                 else
3693                         sigs = c->client_sigalgs;
3694                 if (sigs)
3695                         {
3696                         idx = tls12_get_pkey_idx(sigs[1]);
3697                         md = tls12_get_hash(sigs[0]);
3698                         c->pkeys[idx].digest = md;
3699                         c->pkeys[idx].valid_flags = CERT_PKEY_EXPLICIT_SIGN;
3700                         if (idx == SSL_PKEY_RSA_SIGN)
3701                                 {
3702                                 c->pkeys[SSL_PKEY_RSA_ENC].valid_flags = CERT_PKEY_EXPLICIT_SIGN;
3703                                 c->pkeys[SSL_PKEY_RSA_ENC].digest = md;
3704                                 }
3705                         }
3706                 }
3707 #endif
3708
3709         for (i = 0, sigptr = c->shared_sigalgs;
3710                         i < c->shared_sigalgslen; i++, sigptr++)
3711                 {
3712                 idx = tls12_get_pkey_idx(sigptr->rsign);
3713                 if (idx > 0 && c->pkeys[idx].digest == NULL)
3714                         {
3715                         md = tls12_get_hash(sigptr->rhash);
3716                         c->pkeys[idx].digest = md;
3717                         c->pkeys[idx].valid_flags = CERT_PKEY_EXPLICIT_SIGN;
3718                         if (idx == SSL_PKEY_RSA_SIGN)
3719                                 {
3720                                 c->pkeys[SSL_PKEY_RSA_ENC].valid_flags = CERT_PKEY_EXPLICIT_SIGN;
3721                                 c->pkeys[SSL_PKEY_RSA_ENC].digest = md;
3722                                 }
3723                         }
3724
3725                 }
3726         /* In strict mode leave unset digests as NULL to indicate we can't
3727          * use the certificate for signing.
3728          */
3729         if (!(s->cert->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT))
3730                 {
3731                 /* Set any remaining keys to default values. NOTE: if alg is
3732                  * not supported it stays as NULL.
3733                  */
3734 #ifndef OPENSSL_NO_DSA
3735                 if (!c->pkeys[SSL_PKEY_DSA_SIGN].digest)
3736                         c->pkeys[SSL_PKEY_DSA_SIGN].digest = EVP_sha1();
3737 #endif
3738 #ifndef OPENSSL_NO_RSA
3739                 if (!c->pkeys[SSL_PKEY_RSA_SIGN].digest)
3740                         {
3741                         c->pkeys[SSL_PKEY_RSA_SIGN].digest = EVP_sha1();
3742                         c->pkeys[SSL_PKEY_RSA_ENC].digest = EVP_sha1();
3743                         }
3744 #endif
3745 #ifndef OPENSSL_NO_ECDSA
3746                 if (!c->pkeys[SSL_PKEY_ECC].digest)
3747                         c->pkeys[SSL_PKEY_ECC].digest = EVP_sha1();
3748 #endif
3749                 }
3750         return 1;
3751         }
3752
3753
3754 int SSL_get_sigalgs(SSL *s, int idx,
3755                         int *psign, int *phash, int *psignhash,
3756                         unsigned char *rsig, unsigned char *rhash)
3757         {
3758         const unsigned char *psig = s->cert->peer_sigalgs;
3759         if (psig == NULL)
3760                 return 0;
3761         if (idx >= 0)
3762                 {
3763                 idx <<= 1;
3764                 if (idx >= (int)s->cert->peer_sigalgslen)
3765                         return 0;
3766                 psig += idx;
3767                 if (rhash)
3768                         *rhash = psig[0];
3769                 if (rsig)
3770                         *rsig = psig[1];
3771                 tls1_lookup_sigalg(phash, psign, psignhash, psig);
3772                 }
3773         return s->cert->peer_sigalgslen / 2;
3774         }
3775
3776 int SSL_get_shared_sigalgs(SSL *s, int idx,
3777                         int *psign, int *phash, int *psignhash,
3778                         unsigned char *rsig, unsigned char *rhash)
3779         {
3780         TLS_SIGALGS *shsigalgs = s->cert->shared_sigalgs;
3781         if (!shsigalgs || idx >= (int)s->cert->shared_sigalgslen)
3782                 return 0;
3783         shsigalgs += idx;
3784         if (phash)
3785                 *phash = shsigalgs->hash_nid;
3786         if (psign)
3787                 *psign = shsigalgs->sign_nid;
3788         if (psignhash)
3789                 *psignhash = shsigalgs->signandhash_nid;
3790         if (rsig)
3791                 *rsig = shsigalgs->rsign;
3792         if (rhash)
3793                 *rhash = shsigalgs->rhash;
3794         return s->cert->shared_sigalgslen;
3795         }
3796
3797
3798 #ifndef OPENSSL_NO_HEARTBEATS
3799 int
3800 tls1_process_heartbeat(SSL *s)
3801         {
3802         unsigned char *p = &s->s3->rrec.data[0], *pl;
3803         unsigned short hbtype;
3804         unsigned int payload;
3805         unsigned int padding = 16; /* Use minimum padding */
3806
3807         if (s->msg_callback)
3808                 s->msg_callback(0, s->version, TLS1_RT_HEARTBEAT,
3809                         &s->s3->rrec.data[0], s->s3->rrec.length,
3810                         s, s->msg_callback_arg);
3811
3812         /* Read type and payload length first */
3813         if (1 + 2 + 16 > s->s3->rrec.length)
3814                 return 0; /* silently discard */
3815         hbtype = *p++;
3816         n2s(p, payload);
3817         if (1 + 2 + payload + 16 > s->s3->rrec.length)
3818                 return 0; /* silently discard per RFC 6520 sec. 4 */
3819         pl = p;
3820
3821         if (hbtype == TLS1_HB_REQUEST)
3822                 {
3823                 unsigned char *buffer, *bp;
3824                 int r;
3825
3826                 /* Allocate memory for the response, size is 1 bytes
3827                  * message type, plus 2 bytes payload length, plus
3828                  * payload, plus padding
3829                  */
3830                 buffer = OPENSSL_malloc(1 + 2 + payload + padding);
3831                 bp = buffer;
3832
3833                 /* Enter response type, length and copy payload */
3834                 *bp++ = TLS1_HB_RESPONSE;
3835                 s2n(payload, bp);
3836                 memcpy(bp, pl, payload);
3837                 bp += payload;
3838                 /* Random padding */
3839                 RAND_pseudo_bytes(bp, padding);
3840
3841                 r = ssl3_write_bytes(s, TLS1_RT_HEARTBEAT, buffer, 3 + payload + padding);
3842
3843                 if (r >= 0 && s->msg_callback)
3844                         s->msg_callback(1, s->version, TLS1_RT_HEARTBEAT,
3845                                 buffer, 3 + payload + padding,
3846                                 s, s->msg_callback_arg);
3847
3848                 OPENSSL_free(buffer);
3849
3850                 if (r < 0)
3851                         return r;
3852                 }
3853         else if (hbtype == TLS1_HB_RESPONSE)
3854                 {
3855                 unsigned int seq;
3856
3857                 /* We only send sequence numbers (2 bytes unsigned int),
3858                  * and 16 random bytes, so we just try to read the
3859                  * sequence number */
3860                 n2s(pl, seq);
3861
3862                 if (payload == 18 && seq == s->tlsext_hb_seq)
3863                         {
3864                         s->tlsext_hb_seq++;
3865                         s->tlsext_hb_pending = 0;
3866                         }
3867                 }
3868
3869         return 0;
3870         }
3871
3872 int
3873 tls1_heartbeat(SSL *s)
3874         {
3875         unsigned char *buf, *p;
3876         int ret;
3877         unsigned int payload = 18; /* Sequence number + random bytes */
3878         unsigned int padding = 16; /* Use minimum padding */
3879
3880         /* Only send if peer supports and accepts HB requests... */
3881         if (!(s->tlsext_heartbeat & SSL_TLSEXT_HB_ENABLED) ||
3882             s->tlsext_heartbeat & SSL_TLSEXT_HB_DONT_SEND_REQUESTS)
3883                 {
3884                 SSLerr(SSL_F_TLS1_HEARTBEAT,SSL_R_TLS_HEARTBEAT_PEER_DOESNT_ACCEPT);
3885                 return -1;
3886                 }
3887
3888         /* ...and there is none in flight yet... */
3889         if (s->tlsext_hb_pending)
3890                 {
3891                 SSLerr(SSL_F_TLS1_HEARTBEAT,SSL_R_TLS_HEARTBEAT_PENDING);
3892                 return -1;
3893                 }
3894
3895         /* ...and no handshake in progress. */
3896         if (SSL_in_init(s) || s->in_handshake)
3897                 {
3898                 SSLerr(SSL_F_TLS1_HEARTBEAT,SSL_R_UNEXPECTED_MESSAGE);
3899                 return -1;
3900                 }
3901
3902         /* Check if padding is too long, payload and padding
3903          * must not exceed 2^14 - 3 = 16381 bytes in total.
3904          */
3905         OPENSSL_assert(payload + padding <= 16381);
3906
3907         /* Create HeartBeat message, we just use a sequence number
3908          * as payload to distuingish different messages and add
3909          * some random stuff.
3910          *  - Message Type, 1 byte
3911          *  - Payload Length, 2 bytes (unsigned int)
3912          *  - Payload, the sequence number (2 bytes uint)
3913          *  - Payload, random bytes (16 bytes uint)
3914          *  - Padding
3915          */
3916         buf = OPENSSL_malloc(1 + 2 + payload + padding);
3917         p = buf;
3918         /* Message Type */
3919         *p++ = TLS1_HB_REQUEST;
3920         /* Payload length (18 bytes here) */
3921         s2n(payload, p);
3922         /* Sequence number */
3923         s2n(s->tlsext_hb_seq, p);
3924         /* 16 random bytes */
3925         RAND_pseudo_bytes(p, 16);
3926         p += 16;
3927         /* Random padding */
3928         RAND_pseudo_bytes(p, padding);
3929
3930         ret = ssl3_write_bytes(s, TLS1_RT_HEARTBEAT, buf, 3 + payload + padding);
3931         if (ret >= 0)
3932                 {
3933                 if (s->msg_callback)
3934                         s->msg_callback(1, s->version, TLS1_RT_HEARTBEAT,
3935                                 buf, 3 + payload + padding,
3936                                 s, s->msg_callback_arg);
3937
3938                 s->tlsext_hb_pending = 1;
3939                 }
3940
3941         OPENSSL_free(buf);
3942
3943         return ret;
3944         }
3945 #endif
3946
3947 #define MAX_SIGALGLEN   (TLSEXT_hash_num * TLSEXT_signature_num * 2)
3948
3949 typedef struct
3950         {
3951         size_t sigalgcnt;
3952         int sigalgs[MAX_SIGALGLEN];
3953         } sig_cb_st;
3954
3955 static int sig_cb(const char *elem, int len, void *arg)
3956         {
3957         sig_cb_st *sarg = arg;
3958         size_t i;
3959         char etmp[20], *p;
3960         int sig_alg, hash_alg;
3961         if (sarg->sigalgcnt == MAX_SIGALGLEN)
3962                 return 0;
3963         if (len > (int)(sizeof(etmp) - 1))
3964                 return 0;
3965         memcpy(etmp, elem, len);
3966         etmp[len] = 0;
3967         p = strchr(etmp, '+');
3968         if (!p)
3969                 return 0;
3970         *p = 0;
3971         p++;
3972         if (!*p)
3973                 return 0;
3974
3975         if (!strcmp(etmp, "RSA"))
3976                 sig_alg = EVP_PKEY_RSA;
3977         else if (!strcmp(etmp, "DSA"))
3978                 sig_alg = EVP_PKEY_DSA;
3979         else if (!strcmp(etmp, "ECDSA"))
3980                 sig_alg = EVP_PKEY_EC;
3981         else return 0;
3982
3983         hash_alg = OBJ_sn2nid(p);
3984         if (hash_alg == NID_undef)
3985                 hash_alg = OBJ_ln2nid(p);
3986         if (hash_alg == NID_undef)
3987                 return 0;
3988
3989         for (i = 0; i < sarg->sigalgcnt; i+=2)
3990                 {
3991                 if (sarg->sigalgs[i] == sig_alg
3992                         && sarg->sigalgs[i + 1] == hash_alg)
3993                         return 0;
3994                 }
3995         sarg->sigalgs[sarg->sigalgcnt++] = hash_alg;
3996         sarg->sigalgs[sarg->sigalgcnt++] = sig_alg;
3997         return 1;
3998         }
3999
4000 /* Set suppored signature algorithms based on a colon separated list
4001  * of the form sig+hash e.g. RSA+SHA512:DSA+SHA512 */
4002 int tls1_set_sigalgs_list(CERT *c, const char *str, int client)
4003         {
4004         sig_cb_st sig;
4005         sig.sigalgcnt = 0;
4006         if (!CONF_parse_list(str, ':', 1, sig_cb, &sig))
4007                 return 0;
4008         if (c == NULL)
4009                 return 1;
4010         return tls1_set_sigalgs(c, sig.sigalgs, sig.sigalgcnt, client);
4011         }
4012
4013 int tls1_set_sigalgs(CERT *c, const int *psig_nids, size_t salglen, int client)
4014         {
4015         unsigned char *sigalgs, *sptr;
4016         int rhash, rsign;
4017         size_t i;
4018         if (salglen & 1)
4019                 return 0;
4020         sigalgs = OPENSSL_malloc(salglen);
4021         if (sigalgs == NULL)
4022                 return 0;
4023         for (i = 0, sptr = sigalgs; i < salglen; i+=2)
4024                 {
4025                 rhash = tls12_find_id(*psig_nids++, tls12_md,
4026                                         sizeof(tls12_md)/sizeof(tls12_lookup));
4027                 rsign = tls12_find_id(*psig_nids++, tls12_sig,
4028                                 sizeof(tls12_sig)/sizeof(tls12_lookup));
4029
4030                 if (rhash == -1 || rsign == -1)
4031                         goto err;
4032                 *sptr++ = rhash;
4033                 *sptr++ = rsign;
4034                 }
4035
4036         if (client)
4037                 {
4038                 if (c->client_sigalgs)
4039                         OPENSSL_free(c->client_sigalgs);
4040                 c->client_sigalgs = sigalgs;
4041                 c->client_sigalgslen = salglen;
4042                 }
4043         else
4044                 {
4045                 if (c->conf_sigalgs)
4046                         OPENSSL_free(c->conf_sigalgs);
4047                 c->conf_sigalgs = sigalgs;
4048                 c->conf_sigalgslen = salglen;
4049                 }
4050
4051         return 1;
4052
4053         err:
4054         OPENSSL_free(sigalgs);
4055         return 0;
4056         }
4057
4058 static int tls1_check_sig_alg(CERT *c, X509 *x, int default_nid)
4059         {
4060         int sig_nid;
4061         size_t i;
4062         if (default_nid == -1)
4063                 return 1;
4064         sig_nid = X509_get_signature_nid(x);
4065         if (default_nid)
4066                 return sig_nid == default_nid ? 1 : 0;
4067         for (i = 0; i < c->shared_sigalgslen; i++)
4068                 if (sig_nid == c->shared_sigalgs[i].signandhash_nid)
4069                         return 1;
4070         return 0;
4071         }
4072 /* Check to see if a certificate issuer name matches list of CA names */
4073 static int ssl_check_ca_name(STACK_OF(X509_NAME) *names, X509 *x)
4074         {
4075         X509_NAME *nm;
4076         int i;
4077         nm = X509_get_issuer_name(x);
4078         for (i = 0; i < sk_X509_NAME_num(names); i++)
4079                 {
4080                 if(!X509_NAME_cmp(nm, sk_X509_NAME_value(names, i)))
4081                         return 1;
4082                 }
4083         return 0;
4084         }
4085
4086 /* Check certificate chain is consistent with TLS extensions and is
4087  * usable by server. This servers two purposes: it allows users to
4088  * check chains before passing them to the server and it allows the
4089  * server to check chains before attempting to use them.
4090  */
4091
4092 /* Flags which need to be set for a certificate when stict mode not set */
4093
4094 #define CERT_PKEY_VALID_FLAGS \
4095         (CERT_PKEY_EE_SIGNATURE|CERT_PKEY_EE_PARAM)
4096 /* Strict mode flags */
4097 #define CERT_PKEY_STRICT_FLAGS \
4098          (CERT_PKEY_VALID_FLAGS|CERT_PKEY_CA_SIGNATURE|CERT_PKEY_CA_PARAM \
4099          | CERT_PKEY_ISSUER_NAME|CERT_PKEY_CERT_TYPE)
4100
4101 int tls1_check_chain(SSL *s, X509 *x, EVP_PKEY *pk, STACK_OF(X509) *chain,
4102                                                                         int idx)
4103         {
4104         int i;
4105         int rv = 0;
4106         int check_flags = 0, strict_mode;
4107         CERT_PKEY *cpk = NULL;
4108         CERT *c = s->cert;
4109         unsigned int suiteb_flags = tls1_suiteb(s);
4110         /* idx == -1 means checking server chains */
4111         if (idx != -1)
4112                 {
4113                 /* idx == -2 means checking client certificate chains */
4114                 if (idx == -2)
4115                         {
4116                         cpk = c->key;
4117                         idx = cpk - c->pkeys;
4118                         }
4119                 else
4120                         cpk = c->pkeys + idx;
4121                 x = cpk->x509;
4122                 pk = cpk->privatekey;
4123                 chain = cpk->chain;
4124                 strict_mode = c->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT;
4125                 /* If no cert or key, forget it */
4126                 if (!x || !pk)
4127                         goto end;
4128 #ifdef OPENSSL_SSL_DEBUG_BROKEN_PROTOCOL
4129                 /* Allow any certificate to pass test */
4130                 if (s->cert->cert_flags & SSL_CERT_FLAG_BROKEN_PROTOCOL)
4131                         {
4132                         rv = CERT_PKEY_STRICT_FLAGS|CERT_PKEY_EXPLICIT_SIGN|CERT_PKEY_VALID|CERT_PKEY_SIGN;
4133                         cpk->valid_flags = rv;
4134                         return rv;
4135                         }
4136 #endif
4137                 }
4138         else
4139                 {
4140                 if (!x || !pk)
4141                         goto end;
4142                 idx = ssl_cert_type(x, pk);
4143                 if (idx == -1)
4144                         goto end;
4145                 cpk = c->pkeys + idx;
4146                 if (c->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT)
4147                         check_flags = CERT_PKEY_STRICT_FLAGS;
4148                 else
4149                         check_flags = CERT_PKEY_VALID_FLAGS;
4150                 strict_mode = 1;
4151                 }
4152
4153         if (suiteb_flags)
4154                 {
4155                 int ok;
4156                 if (check_flags)
4157                         check_flags |= CERT_PKEY_SUITEB;
4158                 ok = X509_chain_check_suiteb(NULL, x, chain, suiteb_flags);
4159                 if (ok != X509_V_OK)
4160                         {
4161                         if (check_flags)
4162                                 rv |= CERT_PKEY_SUITEB;
4163                         else
4164                                 goto end;
4165                         }
4166                 }
4167
4168         /* Check all signature algorithms are consistent with
4169          * signature algorithms extension if TLS 1.2 or later
4170          * and strict mode.
4171          */
4172         if (TLS1_get_version(s) >= TLS1_2_VERSION && strict_mode)
4173                 {
4174                 int default_nid;
4175                 unsigned char rsign = 0;
4176                 if (c->peer_sigalgs)
4177                         default_nid = 0;
4178                 /* If no sigalgs extension use defaults from RFC5246 */
4179                 else
4180                         {
4181                         switch(idx)
4182                                 {
4183                         case SSL_PKEY_RSA_ENC:
4184                         case SSL_PKEY_RSA_SIGN:
4185                         case SSL_PKEY_DH_RSA:
4186                                 rsign = TLSEXT_signature_rsa;
4187                                 default_nid = NID_sha1WithRSAEncryption;
4188                                 break;
4189
4190                         case SSL_PKEY_DSA_SIGN:
4191                         case SSL_PKEY_DH_DSA:
4192                                 rsign = TLSEXT_signature_dsa;
4193                                 default_nid = NID_dsaWithSHA1;
4194                                 break;
4195
4196                         case SSL_PKEY_ECC:
4197                                 rsign = TLSEXT_signature_ecdsa;
4198                                 default_nid = NID_ecdsa_with_SHA1;
4199                                 break;
4200
4201                         default:
4202                                 default_nid = -1;
4203                                 break;
4204                                 }
4205                         }
4206                 /* If peer sent no signature algorithms extension and we
4207                  * have set preferred signature algorithms check we support
4208                  * sha1.
4209                  */
4210                 if (default_nid > 0 && c->conf_sigalgs)
4211                         {
4212                         size_t j;
4213                         const unsigned char *p = c->conf_sigalgs;
4214                         for (j = 0; j < c->conf_sigalgslen; j += 2, p += 2)
4215                                 {
4216                                 if (p[0] == TLSEXT_hash_sha1 && p[1] == rsign)
4217                                         break;
4218                                 }
4219                         if (j == c->conf_sigalgslen)
4220                                 {
4221                                 if (check_flags)
4222                                         goto skip_sigs;
4223                                 else
4224                                         goto end;
4225                                 }
4226                         }
4227                 /* Check signature algorithm of each cert in chain */
4228                 if (!tls1_check_sig_alg(c, x, default_nid))
4229                         {
4230                         if (!check_flags) goto end;
4231                         }
4232                 else
4233                         rv |= CERT_PKEY_EE_SIGNATURE;
4234                 rv |= CERT_PKEY_CA_SIGNATURE;
4235                 for (i = 0; i < sk_X509_num(chain); i++)
4236                         {
4237                         if (!tls1_check_sig_alg(c, sk_X509_value(chain, i),
4238                                                         default_nid))
4239                                 {
4240                                 if (check_flags)
4241                                         {
4242                                         rv &= ~CERT_PKEY_CA_SIGNATURE;
4243                                         break;
4244                                         }
4245                                 else
4246                                         goto end;
4247                                 }
4248                         }
4249                 }
4250         /* Else not TLS 1.2, so mark EE and CA signing algorithms OK */
4251         else if(check_flags)
4252                 rv |= CERT_PKEY_EE_SIGNATURE|CERT_PKEY_CA_SIGNATURE;
4253         skip_sigs:
4254         /* Check cert parameters are consistent */
4255         if (tls1_check_cert_param(s, x, check_flags ? 1 : 2))
4256                 rv |= CERT_PKEY_EE_PARAM;
4257         else if (!check_flags)
4258                 goto end;
4259         if (!s->server)
4260                 rv |= CERT_PKEY_CA_PARAM;
4261         /* In strict mode check rest of chain too */
4262         else if (strict_mode)
4263                 {
4264                 rv |= CERT_PKEY_CA_PARAM;
4265                 for (i = 0; i < sk_X509_num(chain); i++)
4266                         {
4267                         X509 *ca = sk_X509_value(chain, i);
4268                         if (!tls1_check_cert_param(s, ca, 0))
4269                                 {
4270                                 if (check_flags)
4271                                         {
4272                                         rv &= ~CERT_PKEY_CA_PARAM;
4273                                         break;
4274                                         }
4275                                 else
4276                                         goto end;
4277                                 }
4278                         }
4279                 }
4280         if (!s->server && strict_mode)
4281                 {
4282                 STACK_OF(X509_NAME) *ca_dn;
4283                 int check_type = 0;
4284                 switch (pk->type)
4285                         {
4286                 case EVP_PKEY_RSA:
4287                         check_type = TLS_CT_RSA_SIGN;
4288                         break;
4289                 case EVP_PKEY_DSA:
4290                         check_type = TLS_CT_DSS_SIGN;
4291                         break;
4292                 case EVP_PKEY_EC:
4293                         check_type = TLS_CT_ECDSA_SIGN;
4294                         break;
4295                 case EVP_PKEY_DH:
4296                 case EVP_PKEY_DHX:
4297                                 {
4298                                 int cert_type = X509_certificate_type(x, pk);
4299                                 if (cert_type & EVP_PKS_RSA)
4300                                         check_type = TLS_CT_RSA_FIXED_DH;
4301                                 if (cert_type & EVP_PKS_DSA)
4302                                         check_type = TLS_CT_DSS_FIXED_DH;
4303                                 }
4304                         }
4305                 if (check_type)
4306                         {
4307                         const unsigned char *ctypes;
4308                         int ctypelen;
4309                         if (c->ctypes)
4310                                 {
4311                                 ctypes = c->ctypes;
4312                                 ctypelen = (int)c->ctype_num;
4313                                 }
4314                         else
4315                                 {
4316                                 ctypes = (unsigned char *)s->s3->tmp.ctype;
4317                                 ctypelen = s->s3->tmp.ctype_num;
4318                                 }
4319                         for (i = 0; i < ctypelen; i++)
4320                                 {
4321                                 if (ctypes[i] == check_type)
4322                                         {
4323                                         rv |= CERT_PKEY_CERT_TYPE;
4324                                         break;
4325                                         }
4326                                 }
4327                         if (!(rv & CERT_PKEY_CERT_TYPE) && !check_flags)
4328                                 goto end;
4329                         }
4330                 else
4331                         rv |= CERT_PKEY_CERT_TYPE;
4332
4333
4334                 ca_dn = s->s3->tmp.ca_names;
4335
4336                 if (!sk_X509_NAME_num(ca_dn))
4337                         rv |= CERT_PKEY_ISSUER_NAME;
4338
4339                 if (!(rv & CERT_PKEY_ISSUER_NAME))
4340                         {
4341                         if (ssl_check_ca_name(ca_dn, x))
4342                                 rv |= CERT_PKEY_ISSUER_NAME;
4343                         }
4344                 if (!(rv & CERT_PKEY_ISSUER_NAME))
4345                         {
4346                         for (i = 0; i < sk_X509_num(chain); i++)
4347                                 {
4348                                 X509 *xtmp = sk_X509_value(chain, i);
4349                                 if (ssl_check_ca_name(ca_dn, xtmp))
4350                                         {
4351                                         rv |= CERT_PKEY_ISSUER_NAME;
4352                                         break;
4353                                         }
4354                                 }
4355                         }
4356                 if (!check_flags && !(rv & CERT_PKEY_ISSUER_NAME))
4357                         goto end;
4358                 }
4359         else
4360                 rv |= CERT_PKEY_ISSUER_NAME|CERT_PKEY_CERT_TYPE;
4361
4362         if (!check_flags || (rv & check_flags) == check_flags)
4363                 rv |= CERT_PKEY_VALID;
4364
4365         end:
4366
4367         if (TLS1_get_version(s) >= TLS1_2_VERSION)
4368                 {
4369                 if (cpk->valid_flags & CERT_PKEY_EXPLICIT_SIGN)
4370                         rv |= CERT_PKEY_EXPLICIT_SIGN|CERT_PKEY_SIGN;
4371                 else if (cpk->digest)
4372                         rv |= CERT_PKEY_SIGN;
4373                 }
4374         else
4375                 rv |= CERT_PKEY_SIGN|CERT_PKEY_EXPLICIT_SIGN;
4376
4377         /* When checking a CERT_PKEY structure all flags are irrelevant
4378          * if the chain is invalid.
4379          */
4380         if (!check_flags)
4381                 {
4382                 if (rv & CERT_PKEY_VALID)
4383                         cpk->valid_flags = rv;
4384                 else
4385                         {
4386                         /* Preserve explicit sign flag, clear rest */
4387                         cpk->valid_flags &= CERT_PKEY_EXPLICIT_SIGN;
4388                         return 0;
4389                         }
4390                 }
4391         return rv;
4392         }
4393
4394 /* Set validity of certificates in an SSL structure */
4395 void tls1_set_cert_validity(SSL *s)
4396         {
4397         tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_RSA_ENC);
4398         tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_RSA_SIGN);
4399         tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_DSA_SIGN);
4400         tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_DH_RSA);
4401         tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_DH_DSA);
4402         tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_ECC);
4403         }
4404 /* User level utiity function to check a chain is suitable */
4405 int SSL_check_chain(SSL *s, X509 *x, EVP_PKEY *pk, STACK_OF(X509) *chain)
4406         {
4407         return tls1_check_chain(s, x, pk, chain, -1);
4408         }
4409
4410 #endif