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 #ifndef OPENSSL_NO_DH
 119 #include <openssl/dh.h>
 120 #include <openssl/bn.h>
 121 #endif
 122 #include "ssl_locl.h"
 123
 124 const char tls1_version_str[]="TLSv1" OPENSSL_VERSION_PTEXT;
 125
 126 #ifndef OPENSSL_NO_TLSEXT
 127 static int tls_decrypt_ticket(SSL *s, const unsigned char *tick, int ticklen,
 128                                 const unsigned char *sess_id, int sesslen,
 129                                 SSL_SESSION **psess);
 130 static int ssl_check_clienthello_tlsext_early(SSL *s);
 131 int ssl_check_serverhello_tlsext(SSL *s);
 132 #endif
 133
 134 SSL3_ENC_METHOD const TLSv1_enc_data={
 135         tls1_enc,
 136         tls1_mac,
 137         tls1_setup_key_block,
 138         tls1_generate_master_secret,
 139         tls1_change_cipher_state,
 140         tls1_final_finish_mac,
 141         TLS1_FINISH_MAC_LENGTH,
 142         tls1_cert_verify_mac,
 143         TLS_MD_CLIENT_FINISH_CONST,TLS_MD_CLIENT_FINISH_CONST_SIZE,
 144         TLS_MD_SERVER_FINISH_CONST,TLS_MD_SERVER_FINISH_CONST_SIZE,
 145         tls1_alert_code,
 146         tls1_export_keying_material,
 147         0,
 148         SSL3_HM_HEADER_LENGTH,
 149         ssl3_set_handshake_header,
 150         ssl3_handshake_write
 151         };
 152
 153 SSL3_ENC_METHOD const TLSv1_1_enc_data={
 154         tls1_enc,
 155         tls1_mac,
 156         tls1_setup_key_block,
 157         tls1_generate_master_secret,
 158         tls1_change_cipher_state,
 159         tls1_final_finish_mac,
 160         TLS1_FINISH_MAC_LENGTH,
 161         tls1_cert_verify_mac,
 162         TLS_MD_CLIENT_FINISH_CONST,TLS_MD_CLIENT_FINISH_CONST_SIZE,
 163         TLS_MD_SERVER_FINISH_CONST,TLS_MD_SERVER_FINISH_CONST_SIZE,
 164         tls1_alert_code,
 165         tls1_export_keying_material,
 166         SSL_ENC_FLAG_EXPLICIT_IV,
 167         SSL3_HM_HEADER_LENGTH,
 168         ssl3_set_handshake_header,
 169         ssl3_handshake_write
 170         };
 171
 172 SSL3_ENC_METHOD const TLSv1_2_enc_data={
 173         tls1_enc,
 174         tls1_mac,
 175         tls1_setup_key_block,
 176         tls1_generate_master_secret,
 177         tls1_change_cipher_state,
 178         tls1_final_finish_mac,
 179         TLS1_FINISH_MAC_LENGTH,
 180         tls1_cert_verify_mac,
 181         TLS_MD_CLIENT_FINISH_CONST,TLS_MD_CLIENT_FINISH_CONST_SIZE,
 182         TLS_MD_SERVER_FINISH_CONST,TLS_MD_SERVER_FINISH_CONST_SIZE,
 183         tls1_alert_code,
 184         tls1_export_keying_material,
 185         SSL_ENC_FLAG_EXPLICIT_IV|SSL_ENC_FLAG_SIGALGS|SSL_ENC_FLAG_SHA256_PRF
 186                 |SSL_ENC_FLAG_TLS1_2_CIPHERS,
 187         SSL3_HM_HEADER_LENGTH,
 188         ssl3_set_handshake_header,
 189         ssl3_handshake_write
 190         };
 191
 192 long tls1_default_timeout(void)
 193         {
 194         /* 2 hours, the 24 hours mentioned in the TLSv1 spec
 195          * is way too long for http, the cache would over fill */
 196         return(60*60*2);
 197         }
 198
 199 int tls1_new(SSL *s)
 200         {
 201         if (!ssl3_new(s)) return(0);
 202         s->method->ssl_clear(s);
 203         return(1);
 204         }
 205
 206 void tls1_free(SSL *s)
 207         {
 208 #ifndef OPENSSL_NO_TLSEXT
 209         if (s->tlsext_session_ticket)
 210                 {
 211                 OPENSSL_free(s->tlsext_session_ticket);
 212                 }
 213 #endif /* OPENSSL_NO_TLSEXT */
 214         ssl3_free(s);
 215         }
 216
 217 void tls1_clear(SSL *s)
 218         {
 219         ssl3_clear(s);
 220         s->version = s->method->version;
 221         }
 222
 223 #ifndef OPENSSL_NO_EC
 224
 225 typedef struct
 226         {
 227         int nid;                /* Curve NID */
 228         int secbits;            /* Bits of security (from SP800-57) */
 229         unsigned int flags;     /* Flags: currently just field type */
 230         } tls_curve_info;
 231
 232 #define TLS_CURVE_CHAR2         0x1
 233 #define TLS_CURVE_PRIME         0x0
 234
 235 static const tls_curve_info nid_list[] =
 236         {
 237                 {NID_sect163k1, 80, TLS_CURVE_CHAR2},/* sect163k1 (1) */
 238                 {NID_sect163r1, 80, TLS_CURVE_CHAR2},/* sect163r1 (2) */
 239                 {NID_sect163r2, 80, TLS_CURVE_CHAR2},/* sect163r2 (3) */
 240                 {NID_sect193r1, 80, TLS_CURVE_CHAR2},/* sect193r1 (4) */
 241                 {NID_sect193r2, 80, TLS_CURVE_CHAR2},/* sect193r2 (5) */
 242                 {NID_sect233k1, 112, TLS_CURVE_CHAR2},/* sect233k1 (6) */
 243                 {NID_sect233r1, 112, TLS_CURVE_CHAR2},/* sect233r1 (7) */
 244                 {NID_sect239k1, 112, TLS_CURVE_CHAR2},/* sect239k1 (8) */
 245                 {NID_sect283k1, 128, TLS_CURVE_CHAR2},/* sect283k1 (9) */
 246                 {NID_sect283r1, 128, TLS_CURVE_CHAR2},/* sect283r1 (10) */
 247                 {NID_sect409k1, 192, TLS_CURVE_CHAR2},/* sect409k1 (11) */
 248                 {NID_sect409r1, 192, TLS_CURVE_CHAR2},/* sect409r1 (12) */
 249                 {NID_sect571k1, 256, TLS_CURVE_CHAR2},/* sect571k1 (13) */
 250                 {NID_sect571r1, 256, TLS_CURVE_CHAR2},/* sect571r1 (14) */
 251                 {NID_secp160k1, 80, TLS_CURVE_PRIME},/* secp160k1 (15) */
 252                 {NID_secp160r1, 80, TLS_CURVE_PRIME},/* secp160r1 (16) */
 253                 {NID_secp160r2, 80, TLS_CURVE_PRIME},/* secp160r2 (17) */
 254                 {NID_secp192k1, 80, TLS_CURVE_PRIME},/* secp192k1 (18) */
 255                 {NID_X9_62_prime192v1, 80, TLS_CURVE_PRIME},/* secp192r1 (19) */
 256                 {NID_secp224k1, 112, TLS_CURVE_PRIME},/* secp224k1 (20) */
 257                 {NID_secp224r1, 112, TLS_CURVE_PRIME},/* secp224r1 (21) */
 258                 {NID_secp256k1, 128, TLS_CURVE_PRIME},/* secp256k1 (22) */
 259                 {NID_X9_62_prime256v1, 128, TLS_CURVE_PRIME},/* secp256r1 (23) */
 260                 {NID_secp384r1, 192, TLS_CURVE_PRIME},/* secp384r1 (24) */
 261                 {NID_secp521r1, 256, TLS_CURVE_PRIME},/* secp521r1 (25) */
 262                 {NID_brainpoolP256r1, 128, TLS_CURVE_PRIME}, /* brainpoolP256r1 (26) */
 263                 {NID_brainpoolP384r1, 192, TLS_CURVE_PRIME}, /* brainpoolP384r1 (27) */
 264                 {NID_brainpoolP512r1, 256, TLS_CURVE_PRIME},/* brainpool512r1 (28) */
 265         };
 266
 267
 268 static const unsigned char ecformats_default[] =
 269         {
 270         TLSEXT_ECPOINTFORMAT_uncompressed,
 271         TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime,
 272         TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2
 273         };
 274
 275 static const unsigned char eccurves_default[] =
 276         {
 277                 0,14, /* sect571r1 (14) */
 278                 0,13, /* sect571k1 (13) */
 279                 0,25, /* secp521r1 (25) */
 280                 0,28, /* brainpool512r1 (28) */
 281                 0,11, /* sect409k1 (11) */
 282                 0,12, /* sect409r1 (12) */
 283                 0,27, /* brainpoolP384r1 (27) */
 284                 0,24, /* secp384r1 (24) */
 285                 0,9,  /* sect283k1 (9) */
 286                 0,10, /* sect283r1 (10) */
 287                 0,26, /* brainpoolP256r1 (26) */
 288                 0,22, /* secp256k1 (22) */
 289                 0,23, /* secp256r1 (23) */
 290                 0,8,  /* sect239k1 (8) */
 291                 0,6,  /* sect233k1 (6) */
 292                 0,7,  /* sect233r1 (7) */
 293                 0,20, /* secp224k1 (20) */
 294                 0,21, /* secp224r1 (21) */
 295                 0,4,  /* sect193r1 (4) */
 296                 0,5,  /* sect193r2 (5) */
 297                 0,18, /* secp192k1 (18) */
 298                 0,19, /* secp192r1 (19) */
 299                 0,1,  /* sect163k1 (1) */
 300                 0,2,  /* sect163r1 (2) */
 301                 0,3,  /* sect163r2 (3) */
 302                 0,15, /* secp160k1 (15) */
 303                 0,16, /* secp160r1 (16) */
 304                 0,17, /* secp160r2 (17) */
 305         };
 306
 307 static const unsigned char suiteb_curves[] =
 308         {
 309                 0, TLSEXT_curve_P_256,
 310                 0, TLSEXT_curve_P_384
 311         };
 312
 313 int tls1_ec_curve_id2nid(int curve_id)
 314         {
 315         /* ECC curves from RFC 4492 and RFC 7027 */
 316         if ((curve_id < 1) || ((unsigned int)curve_id >
 317                                 sizeof(nid_list)/sizeof(nid_list[0])))
 318                 return 0;
 319         return nid_list[curve_id-1].nid;
 320         }
 321
 322 int tls1_ec_nid2curve_id(int nid)
 323         {
 324         /* ECC curves from RFC 4492 and RFC 7027 */
 325         switch (nid)
 326                 {
 327         case NID_sect163k1: /* sect163k1 (1) */
 328                 return 1;
 329         case NID_sect163r1: /* sect163r1 (2) */
 330                 return 2;
 331         case NID_sect163r2: /* sect163r2 (3) */
 332                 return 3;
 333         case NID_sect193r1: /* sect193r1 (4) */
 334                 return 4;
 335         case NID_sect193r2: /* sect193r2 (5) */
 336                 return 5;
 337         case NID_sect233k1: /* sect233k1 (6) */
 338                 return 6;
 339         case NID_sect233r1: /* sect233r1 (7) */
 340                 return 7;
 341         case NID_sect239k1: /* sect239k1 (8) */
 342                 return 8;
 343         case NID_sect283k1: /* sect283k1 (9) */
 344                 return 9;
 345         case NID_sect283r1: /* sect283r1 (10) */
 346                 return 10;
 347         case NID_sect409k1: /* sect409k1 (11) */
 348                 return 11;
 349         case NID_sect409r1: /* sect409r1 (12) */
 350                 return 12;
 351         case NID_sect571k1: /* sect571k1 (13) */
 352                 return 13;
 353         case NID_sect571r1: /* sect571r1 (14) */
 354                 return 14;
 355         case NID_secp160k1: /* secp160k1 (15) */
 356                 return 15;
 357         case NID_secp160r1: /* secp160r1 (16) */
 358                 return 16;
 359         case NID_secp160r2: /* secp160r2 (17) */
 360                 return 17;
 361         case NID_secp192k1: /* secp192k1 (18) */
 362                 return 18;
 363         case NID_X9_62_prime192v1: /* secp192r1 (19) */
 364                 return 19;
 365         case NID_secp224k1: /* secp224k1 (20) */
 366                 return 20;
 367         case NID_secp224r1: /* secp224r1 (21) */
 368                 return 21;
 369         case NID_secp256k1: /* secp256k1 (22) */
 370                 return 22;
 371         case NID_X9_62_prime256v1: /* secp256r1 (23) */
 372                 return 23;
 373         case NID_secp384r1: /* secp384r1 (24) */
 374                 return 24;
 375         case NID_secp521r1:  /* secp521r1 (25) */
 376                 return 25;
 377         case NID_brainpoolP256r1:  /* brainpoolP256r1 (26) */
 378                 return 26;
 379         case NID_brainpoolP384r1:  /* brainpoolP384r1 (27) */
 380                 return 27;
 381         case NID_brainpoolP512r1:  /* brainpool512r1 (28) */
 382                 return 28;
 383         default:
 384                 return 0;
 385                 }
 386         }
 387 /*
 388  * Get curves list, if "sess" is set return client curves otherwise
 389  * preferred list.
 390  * Sets |num_curves| to the number of curves in the list, i.e.,
 391  * the length of |pcurves| is 2 * num_curves.
 392  * Returns 1 on success and 0 if the client curves list has invalid format.
 393  * The latter indicates an internal error: we should not be accepting such
 394  * lists in the first place.
 395  * TODO(emilia): we should really be storing the curves list in explicitly
 396  * parsed form instead. (However, this would affect binary compatibility
 397  * so cannot happen in the 1.0.x series.)
 398  */
 399 static int tls1_get_curvelist(SSL *s, int sess,
 400                                         const unsigned char **pcurves,
 401                                         size_t *num_curves)
 402         {
 403         size_t pcurveslen = 0;
 404         if (sess)
 405                 {
 406                 *pcurves = s->session->tlsext_ellipticcurvelist;
 407                 pcurveslen = s->session->tlsext_ellipticcurvelist_length;
 408                 }
 409         else
 410                 {
 411                 /* For Suite B mode only include P-256, P-384 */
 412                 switch (tls1_suiteb(s))
 413                         {
 414                 case SSL_CERT_FLAG_SUITEB_128_LOS:
 415                         *pcurves = suiteb_curves;
 416                         pcurveslen = sizeof(suiteb_curves);
 417                         break;
 418
 419                 case SSL_CERT_FLAG_SUITEB_128_LOS_ONLY:
 420                         *pcurves = suiteb_curves;
 421                         pcurveslen = 2;
 422                         break;
 423
 424                 case SSL_CERT_FLAG_SUITEB_192_LOS:
 425                         *pcurves = suiteb_curves + 2;
 426                         pcurveslen = 2;
 427                         break;
 428                 default:
 429                         *pcurves = s->tlsext_ellipticcurvelist;
 430                         pcurveslen = s->tlsext_ellipticcurvelist_length;
 431                         }
 432                 if (!*pcurves)
 433                         {
 434                         *pcurves = eccurves_default;
 435                         pcurveslen = sizeof(eccurves_default);
 436                         }
 437                 }
 438
 439         /* We do not allow odd length arrays to enter the system. */
 440         if (pcurveslen & 1)
 441                 {
 442                 SSLerr(SSL_F_TLS1_GET_CURVELIST, ERR_R_INTERNAL_ERROR);
 443                 *num_curves = 0;
 444                 return 0;
 445                 }
 446         else
 447                 {
 448                 *num_curves = pcurveslen / 2;
 449                 return 1;
 450                 }
 451         }
 452
 453 /* See if curve is allowed by security callback */
 454 static int tls_curve_allowed(SSL *s, const unsigned char *curve, int op)
 455         {
 456         const tls_curve_info *cinfo;
 457         if (curve[0])
 458                 return 1;
 459         if ((curve[1] < 1) || ((size_t)curve[1] >
 460                                 sizeof(nid_list)/sizeof(nid_list[0])))
 461                 return 0;
 462         cinfo = &nid_list[curve[1]-1];
 463 #ifdef OPENSSL_NO_EC2M
 464         if (cinfo->flags & TLS_CURVE_CHAR2)
 465                 return 0;
 466 #endif
 467         return ssl_security(s, op, cinfo->secbits, cinfo->nid, (void *)curve);
 468         }
 469
 470 /* Check a curve is one of our preferences */
 471 int tls1_check_curve(SSL *s, const unsigned char *p, size_t len)
 472         {
 473         const unsigned char *curves;
 474         size_t num_curves, i;
 475         unsigned int suiteb_flags = tls1_suiteb(s);
 476         if (len != 3 || p[0] != NAMED_CURVE_TYPE)
 477                 return 0;
 478         /* Check curve matches Suite B preferences */
 479         if (suiteb_flags)
 480                 {
 481                 unsigned long cid = s->s3->tmp.new_cipher->id;
 482                 if (p[1])
 483                         return 0;
 484                 if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256)
 485                         {
 486                         if (p[2] != TLSEXT_curve_P_256)
 487                                 return 0;
 488                         }
 489                 else if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384)
 490                         {
 491                         if (p[2] != TLSEXT_curve_P_384)
 492                                 return 0;
 493                         }
 494                 else    /* Should never happen */
 495                         return 0;
 496                 }
 497         if (!tls1_get_curvelist(s, 0, &curves, &num_curves))
 498                 return 0;
 499         for (i = 0; i < num_curves; i++, curves += 2)
 500                 {
 501                 if (p[1] == curves[0] && p[2] == curves[1])
 502                         return tls_curve_allowed(s, p + 1, SSL_SECOP_CURVE_CHECK);
 503                 }
 504         return 0;
 505         }
 506
 507 /*-
 508  * Return |nmatch|th shared curve or NID_undef if there is no match.
 509  * For nmatch == -1, return number of  matches
 510  * For nmatch == -2, return the NID of the curve to use for
 511  * an EC tmp key, or NID_undef if there is no match.
 512  */
 513 int tls1_shared_curve(SSL *s, int nmatch)
 514         {
 515         const unsigned char *pref, *supp;
 516         size_t num_pref, num_supp, i, j;
 517         int k;
 518         /* Can't do anything on client side */
 519         if (s->server == 0)
 520                 return -1;
 521         if (nmatch == -2)
 522                 {
 523                 if (tls1_suiteb(s))
 524                         {
 525                         /* For Suite B ciphersuite determines curve: we
 526                          * already know these are acceptable due to previous
 527                          * checks.
 528                          */
 529                         unsigned long cid = s->s3->tmp.new_cipher->id;
 530                         if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256)
 531                                 return NID_X9_62_prime256v1; /* P-256 */
 532                         if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384)
 533                                 return NID_secp384r1; /* P-384 */
 534                         /* Should never happen */
 535                         return NID_undef;
 536                         }
 537                 /* If not Suite B just return first preference shared curve */
 538                 nmatch = 0;
 539                 }
 540         /*
 541          * Avoid truncation. tls1_get_curvelist takes an int
 542          * but s->options is a long...
 543          */
 544         if (!tls1_get_curvelist(s, (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE) != 0,
 545                         &supp, &num_supp))
 546                 /* In practice, NID_undef == 0 but let's be precise. */
 547                 return nmatch == -1 ? 0 : NID_undef;
 548         if(!tls1_get_curvelist(s, !(s->options & SSL_OP_CIPHER_SERVER_PREFERENCE),
 549                         &pref, &num_pref))
 550                 return nmatch == -1 ? 0 : NID_undef;
 551         k = 0;
 552         for (i = 0; i < num_pref; i++, pref+=2)
 553                 {
 554                 const unsigned char *tsupp = supp;
 555                 for (j = 0; j < num_supp; j++, tsupp+=2)
 556                         {
 557                         if (pref[0] == tsupp[0] && pref[1] == tsupp[1])
 558                                 {
 559                                 if (!tls_curve_allowed(s, pref, SSL_SECOP_CURVE_SHARED))
 560                                         continue;
 561                                 if (nmatch == k)
 562                                         {
 563                                         int id = (pref[0] << 8) | pref[1];
 564                                         return tls1_ec_curve_id2nid(id);
 565                                         }
 566                                 k++;
 567                                 }
 568                         }
 569                 }
 570         if (nmatch == -1)
 571                 return k;
 572         /* Out of range (nmatch > k). */
 573         return NID_undef;
 574         }
 575
 576 int tls1_set_curves(unsigned char **pext, size_t *pextlen,
 577                         int *curves, size_t ncurves)
 578         {
 579         unsigned char *clist, *p;
 580         size_t i;
 581         /* Bitmap of curves included to detect duplicates: only works
 582          * while curve ids < 32
 583          */
 584         unsigned long dup_list = 0;
 585         clist = OPENSSL_malloc(ncurves * 2);
 586         if (!clist)
 587                 return 0;
 588         for (i = 0, p = clist; i < ncurves; i++)
 589                 {
 590                 unsigned long idmask;
 591                 int id;
 592                 id = tls1_ec_nid2curve_id(curves[i]);
 593                 idmask = 1L << id;
 594                 if (!id || (dup_list & idmask))
 595                         {
 596                         OPENSSL_free(clist);
 597                         return 0;
 598                         }
 599                 dup_list |= idmask;
 600                 s2n(id, p);
 601                 }
 602         if (*pext)
 603                 OPENSSL_free(*pext);
 604         *pext = clist;
 605         *pextlen = ncurves * 2;
 606         return 1;
 607         }
 608
 609 #define MAX_CURVELIST   28
 610
 611 typedef struct
 612         {
 613         size_t nidcnt;
 614         int nid_arr[MAX_CURVELIST];
 615         } nid_cb_st;
 616
 617 static int nid_cb(const char *elem, int len, void *arg)
 618         {
 619         nid_cb_st *narg = arg;
 620         size_t i;
 621         int nid;
 622         char etmp[20];
 623         if (narg->nidcnt == MAX_CURVELIST)
 624                 return 0;
 625         if (len > (int)(sizeof(etmp) - 1))
 626                 return 0;
 627         memcpy(etmp, elem, len);
 628         etmp[len] = 0;
 629         nid = EC_curve_nist2nid(etmp);
 630         if (nid == NID_undef)
 631                 nid = OBJ_sn2nid(etmp);
 632         if (nid == NID_undef)
 633                 nid = OBJ_ln2nid(etmp);
 634         if (nid == NID_undef)
 635                 return 0;
 636         for (i = 0; i < narg->nidcnt; i++)
 637                 if (narg->nid_arr[i] == nid)
 638                         return 0;
 639         narg->nid_arr[narg->nidcnt++] = nid;
 640         return 1;
 641         }
 642 /* Set curves based on a colon separate list */
 643 int tls1_set_curves_list(unsigned char **pext, size_t *pextlen,
 644                                 const char *str)
 645         {
 646         nid_cb_st ncb;
 647         ncb.nidcnt = 0;
 648         if (!CONF_parse_list(str, ':', 1, nid_cb, &ncb))
 649                 return 0;
 650         if (pext == NULL)
 651                 return 1;
 652         return tls1_set_curves(pext, pextlen, ncb.nid_arr, ncb.nidcnt);
 653         }
 654 /* For an EC key set TLS id and required compression based on parameters */
 655 static int tls1_set_ec_id(unsigned char *curve_id, unsigned char *comp_id,
 656                                 EC_KEY *ec)
 657         {
 658         int is_prime, id;
 659         const EC_GROUP *grp;
 660         const EC_METHOD *meth;
 661         if (!ec)
 662                 return 0;
 663         /* Determine if it is a prime field */
 664         grp = EC_KEY_get0_group(ec);
 665         if (!grp)
 666                 return 0;
 667         meth = EC_GROUP_method_of(grp);
 668         if (!meth)
 669                 return 0;
 670         if (EC_METHOD_get_field_type(meth) == NID_X9_62_prime_field)
 671                 is_prime = 1;
 672         else
 673                 is_prime = 0;
 674         /* Determine curve ID */
 675         id = EC_GROUP_get_curve_name(grp);
 676         id = tls1_ec_nid2curve_id(id);
 677         /* If we have an ID set it, otherwise set arbitrary explicit curve */
 678         if (id)
 679                 {
 680                 curve_id[0] = 0;
 681                 curve_id[1] = (unsigned char)id;
 682                 }
 683         else
 684                 {
 685                 curve_id[0] = 0xff;
 686                 if (is_prime)
 687                         curve_id[1] = 0x01;
 688                 else
 689                         curve_id[1] = 0x02;
 690                 }
 691         if (comp_id)
 692                 {
 693                 if (EC_KEY_get0_public_key(ec) == NULL)
 694                         return 0;
 695                 if (EC_KEY_get_conv_form(ec) == POINT_CONVERSION_COMPRESSED)
 696                         {
 697                         if (is_prime)
 698                                 *comp_id = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime;
 699                         else
 700                                 *comp_id = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2;
 701                         }
 702                 else
 703                         *comp_id = TLSEXT_ECPOINTFORMAT_uncompressed;
 704                 }
 705         return 1;
 706         }
 707 /* Check an EC key is compatible with extensions */
 708 static int tls1_check_ec_key(SSL *s,
 709                         unsigned char *curve_id, unsigned char *comp_id)
 710         {
 711         const unsigned char *pformats, *pcurves;
 712         size_t num_formats, num_curves, i;
 713         int j;
 714         /* If point formats extension present check it, otherwise everything
 715          * is supported (see RFC4492).
 716          */
 717         if (comp_id && s->session->tlsext_ecpointformatlist)
 718                 {
 719                 pformats = s->session->tlsext_ecpointformatlist;
 720                 num_formats = s->session->tlsext_ecpointformatlist_length;
 721                 for (i = 0; i < num_formats; i++, pformats++)
 722                         {
 723                         if (*comp_id == *pformats)
 724                                 break;
 725                         }
 726                 if (i == num_formats)
 727                         return 0;
 728                 }
 729         if (!curve_id)
 730                 return 1;
 731         /* Check curve is consistent with client and server preferences */
 732         for (j = 0; j <= 1; j++)
 733                 {
 734                 if (!tls1_get_curvelist(s, j, &pcurves, &num_curves))
 735                         return 0;
 736                 for (i = 0; i < num_curves; i++, pcurves += 2)
 737                         {
 738                         if (pcurves[0] == curve_id[0] &&
 739                             pcurves[1] == curve_id[1])
 740                                 break;
 741                         }
 742                 if (i == num_curves)
 743                         return 0;
 744                 /* For clients can only check sent curve list */
 745                 if (!s->server)
 746                         break;
 747                 }
 748         return 1;
 749         }
 750
 751 static void tls1_get_formatlist(SSL *s, const unsigned char **pformats,
 752                                         size_t *num_formats)
 753         {
 754         /* If we have a custom point format list use it otherwise
 755          * use default */
 756         if (s->tlsext_ecpointformatlist)
 757                 {
 758                 *pformats = s->tlsext_ecpointformatlist;
 759                 *num_formats = s->tlsext_ecpointformatlist_length;
 760                 }
 761         else
 762                 {
 763                 *pformats = ecformats_default;
 764                 /* For Suite B we don't support char2 fields */
 765                 if (tls1_suiteb(s))
 766                         *num_formats = sizeof(ecformats_default) - 1;
 767                 else
 768                         *num_formats = sizeof(ecformats_default);
 769                 }
 770         }
 771
 772 /* Check cert parameters compatible with extensions: currently just checks
 773  * EC certificates have compatible curves and compression.
 774  */
 775 static int tls1_check_cert_param(SSL *s, X509 *x, int set_ee_md)
 776         {
 777         unsigned char comp_id, curve_id[2];
 778         EVP_PKEY *pkey;
 779         int rv;
 780         pkey = X509_get_pubkey(x);
 781         if (!pkey)
 782                 return 0;
 783         /* If not EC nothing to do */
 784         if (pkey->type != EVP_PKEY_EC)
 785                 {
 786                 EVP_PKEY_free(pkey);
 787                 return 1;
 788                 }
 789         rv = tls1_set_ec_id(curve_id, &comp_id, pkey->pkey.ec);
 790         EVP_PKEY_free(pkey);
 791         if (!rv)
 792                 return 0;
 793         /* Can't check curve_id for client certs as we don't have a
 794          * supported curves extension.
 795          */
 796         rv = tls1_check_ec_key(s, s->server ? curve_id : NULL, &comp_id);
 797         if (!rv)
 798                 return 0;
 799         /* Special case for suite B. We *MUST* sign using SHA256+P-256 or
 800          * SHA384+P-384, adjust digest if necessary.
 801          */
 802         if (set_ee_md && tls1_suiteb(s))
 803                 {
 804                 int check_md;
 805                 size_t i;
 806                 CERT *c = s->cert;
 807                 if (curve_id[0])
 808                         return 0;
 809                 /* Check to see we have necessary signing algorithm */
 810                 if (curve_id[1] == TLSEXT_curve_P_256)
 811                         check_md = NID_ecdsa_with_SHA256;
 812                 else if (curve_id[1] == TLSEXT_curve_P_384)
 813                         check_md = NID_ecdsa_with_SHA384;
 814                 else
 815                         return 0; /* Should never happen */
 816                 for (i = 0; i < c->shared_sigalgslen; i++)
 817                         if (check_md == c->shared_sigalgs[i].signandhash_nid)
 818                                 break;
 819                 if (i == c->shared_sigalgslen)
 820                         return 0;
 821                 if (set_ee_md == 2)
 822                         {
 823                         if (check_md == NID_ecdsa_with_SHA256)
 824                                 c->pkeys[SSL_PKEY_ECC].digest = EVP_sha256();
 825                         else
 826                                 c->pkeys[SSL_PKEY_ECC].digest = EVP_sha384();
 827                         }
 828                 }
 829         return rv;
 830         }
 831 #ifndef OPENSSL_NO_ECDH
 832 /* Check EC temporary key is compatible with client extensions */
 833 int tls1_check_ec_tmp_key(SSL *s, unsigned long cid)
 834         {
 835         unsigned char curve_id[2];
 836         EC_KEY *ec = s->cert->ecdh_tmp;
 837 #ifdef OPENSSL_SSL_DEBUG_BROKEN_PROTOCOL
 838         /* Allow any curve: not just those peer supports */
 839         if (s->cert->cert_flags & SSL_CERT_FLAG_BROKEN_PROTOCOL)
 840                 return 1;
 841 #endif
 842         /* If Suite B, AES128 MUST use P-256 and AES256 MUST use P-384,
 843          * no other curves permitted.
 844          */
 845         if (tls1_suiteb(s))
 846                 {
 847                 /* Curve to check determined by ciphersuite */
 848                 if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256)
 849                         curve_id[1] = TLSEXT_curve_P_256;
 850                 else if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384)
 851                         curve_id[1] = TLSEXT_curve_P_384;
 852                 else
 853                         return 0;
 854                 curve_id[0] = 0;
 855                 /* Check this curve is acceptable */
 856                 if (!tls1_check_ec_key(s, curve_id, NULL))
 857                         return 0;
 858                 /* If auto or setting curve from callback assume OK */
 859                 if (s->cert->ecdh_tmp_auto || s->cert->ecdh_tmp_cb)
 860                         return 1;
 861                 /* Otherwise check curve is acceptable */
 862                 else
 863                         {
 864                         unsigned char curve_tmp[2];
 865                         if (!ec)
 866                                 return 0;
 867                         if (!tls1_set_ec_id(curve_tmp, NULL, ec))
 868                                 return 0;
 869                         if (!curve_tmp[0] || curve_tmp[1] == curve_id[1])
 870                                 return 1;
 871                         return 0;
 872                         }
 873
 874                 }
 875         if (s->cert->ecdh_tmp_auto)
 876                 {
 877                 /* Need a shared curve */
 878                 if (tls1_shared_curve(s, 0))
 879                         return 1;
 880                 else return 0;
 881                 }
 882         if (!ec)
 883                 {
 884                 if (s->cert->ecdh_tmp_cb)
 885                         return 1;
 886                 else
 887                         return 0;
 888                 }
 889         if (!tls1_set_ec_id(curve_id, NULL, ec))
 890                 return 0;
 891 /* Set this to allow use of invalid curves for testing */
 892 #if 0
 893         return 1;
 894 #else
 895         return tls1_check_ec_key(s, curve_id, NULL);
 896 #endif
 897         }
 898 #endif /* OPENSSL_NO_ECDH */
 899
 900 #else
 901
 902 static int tls1_check_cert_param(SSL *s, X509 *x, int set_ee_md)
 903         {
 904         return 1;
 905         }
 906
 907 #endif /* OPENSSL_NO_EC */
 908
 909 #ifndef OPENSSL_NO_TLSEXT
 910
 911 /* List of supported signature algorithms and hashes. Should make this
 912  * customisable at some point, for now include everything we support.
 913  */
 914
 915 #ifdef OPENSSL_NO_RSA
 916 #define tlsext_sigalg_rsa(md) /* */
 917 #else
 918 #define tlsext_sigalg_rsa(md) md, TLSEXT_signature_rsa,
 919 #endif
 920
 921 #ifdef OPENSSL_NO_DSA
 922 #define tlsext_sigalg_dsa(md) /* */
 923 #else
 924 #define tlsext_sigalg_dsa(md) md, TLSEXT_signature_dsa,
 925 #endif
 926
 927 #ifdef OPENSSL_NO_ECDSA
 928 #define tlsext_sigalg_ecdsa(md) /* */
 929 #else
 930 #define tlsext_sigalg_ecdsa(md) md, TLSEXT_signature_ecdsa,
 931 #endif
 932
 933 #define tlsext_sigalg(md) \
 934                 tlsext_sigalg_rsa(md) \
 935                 tlsext_sigalg_dsa(md) \
 936                 tlsext_sigalg_ecdsa(md)
 937
 938 static const unsigned char tls12_sigalgs[] = {
 939 #ifndef OPENSSL_NO_SHA512
 940         tlsext_sigalg(TLSEXT_hash_sha512)
 941         tlsext_sigalg(TLSEXT_hash_sha384)
 942 #endif
 943 #ifndef OPENSSL_NO_SHA256
 944         tlsext_sigalg(TLSEXT_hash_sha256)
 945         tlsext_sigalg(TLSEXT_hash_sha224)
 946 #endif
 947 #ifndef OPENSSL_NO_SHA
 948         tlsext_sigalg(TLSEXT_hash_sha1)
 949 #endif
 950 };
 951 #ifndef OPENSSL_NO_ECDSA
 952 static const unsigned char suiteb_sigalgs[] = {
 953         tlsext_sigalg_ecdsa(TLSEXT_hash_sha256)
 954         tlsext_sigalg_ecdsa(TLSEXT_hash_sha384)
 955 };
 956 #endif
 957 size_t tls12_get_psigalgs(SSL *s, const unsigned char **psigs)
 958         {
 959         /* If Suite B mode use Suite B sigalgs only, ignore any other
 960          * preferences.
 961          */
 962 #ifndef OPENSSL_NO_EC
 963         switch (tls1_suiteb(s))
 964                 {
 965         case SSL_CERT_FLAG_SUITEB_128_LOS:
 966                 *psigs = suiteb_sigalgs;
 967                 return sizeof(suiteb_sigalgs);
 968
 969         case SSL_CERT_FLAG_SUITEB_128_LOS_ONLY:
 970                 *psigs = suiteb_sigalgs;
 971                 return 2;
 972
 973         case SSL_CERT_FLAG_SUITEB_192_LOS:
 974                 *psigs = suiteb_sigalgs + 2;
 975                 return 2;
 976                 }
 977 #endif
 978         /* If server use client authentication sigalgs if not NULL */
 979         if (s->server && s->cert->client_sigalgs)
 980                 {
 981                 *psigs = s->cert->client_sigalgs;
 982                 return s->cert->client_sigalgslen;
 983                 }
 984         else if (s->cert->conf_sigalgs)
 985                 {
 986                 *psigs = s->cert->conf_sigalgs;
 987                 return s->cert->conf_sigalgslen;
 988                 }
 989         else
 990                 {
 991                 *psigs = tls12_sigalgs;
 992                 return sizeof(tls12_sigalgs);
 993                 }
 994         }
 995 /* Check signature algorithm is consistent with sent supported signature
 996  * algorithms and if so return relevant digest.
 997  */
 998 int tls12_check_peer_sigalg(const EVP_MD **pmd, SSL *s,
 999                                 const unsigned char *sig, EVP_PKEY *pkey)
1000         {
1001         const unsigned char *sent_sigs;
1002         size_t sent_sigslen, i;
1003         int sigalg = tls12_get_sigid(pkey);
1004         /* Should never happen */
1005         if (sigalg == -1)
1006                 return -1;
1007         /* Check key type is consistent with signature */
1008         if (sigalg != (int)sig[1])
1009                 {
1010                 SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG,SSL_R_WRONG_SIGNATURE_TYPE);
1011                 return 0;
1012                 }
1013 #ifndef OPENSSL_NO_EC
1014         if (pkey->type == EVP_PKEY_EC)
1015                 {
1016                 unsigned char curve_id[2], comp_id;
1017                 /* Check compression and curve matches extensions */
1018                 if (!tls1_set_ec_id(curve_id, &comp_id, pkey->pkey.ec))
1019                         return 0;
1020                 if (!s->server && !tls1_check_ec_key(s, curve_id, &comp_id))
1021                         {
1022                         SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG,SSL_R_WRONG_CURVE);
1023                         return 0;
1024                         }
1025                 /* If Suite B only P-384+SHA384 or P-256+SHA-256 allowed */
1026                 if (tls1_suiteb(s))
1027                         {
1028                         if (curve_id[0])
1029                                 return 0;
1030                         if (curve_id[1] == TLSEXT_curve_P_256)
1031                                 {
1032                                 if (sig[0] != TLSEXT_hash_sha256)
1033                                         {
1034                                         SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG,
1035                                                 SSL_R_ILLEGAL_SUITEB_DIGEST);
1036                                         return 0;
1037                                         }
1038                                 }
1039                         else if (curve_id[1] == TLSEXT_curve_P_384)
1040                                 {
1041                                 if (sig[0] != TLSEXT_hash_sha384)
1042                                         {
1043                                         SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG,
1044                                                 SSL_R_ILLEGAL_SUITEB_DIGEST);
1045                                         return 0;
1046                                         }
1047                                 }
1048                         else
1049                                 return 0;
1050                         }
1051                 }
1052         else if (tls1_suiteb(s))
1053                 return 0;
1054 #endif
1055
1056         /* Check signature matches a type we sent */
1057         sent_sigslen = tls12_get_psigalgs(s, &sent_sigs);
1058         for (i = 0; i < sent_sigslen; i+=2, sent_sigs+=2)
1059                 {
1060                 if (sig[0] == sent_sigs[0] && sig[1] == sent_sigs[1])
1061                         break;
1062                 }
1063         /* Allow fallback to SHA1 if not strict mode */
1064         if (i == sent_sigslen && (sig[0] != TLSEXT_hash_sha1 || s->cert->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT))
1065                 {
1066                 SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG,SSL_R_WRONG_SIGNATURE_TYPE);
1067                 return 0;
1068                 }
1069         *pmd = tls12_get_hash(sig[0]);
1070         if (*pmd == NULL)
1071                 {
1072                 SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG,SSL_R_UNKNOWN_DIGEST);
1073                 return 0;
1074                 }
1075         /* Make sure security callback allows algorithm */
1076         if (!ssl_security(s, SSL_SECOP_SIGALG_CHECK,
1077                                 EVP_MD_size(*pmd) * 4, EVP_MD_type(*pmd),
1078                                                                 (void *)sig))
1079                 {
1080                 SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG,SSL_R_WRONG_SIGNATURE_TYPE);
1081                 return 0;
1082                 }
1083         /* Store the digest used so applications can retrieve it if they
1084          * wish.
1085          */
1086         if (s->session && s->session->sess_cert)
1087                 s->session->sess_cert->peer_key->digest = *pmd;
1088         return 1;
1089         }
1090
1091 /* Get a mask of disabled algorithms: an algorithm is disabled
1092  * if it isn't supported or doesn't appear in supported signature
1093  * algorithms. Unlike ssl_cipher_get_disabled this applies to a specific
1094  * session and not global settings.
1095  *
1096  */
1097 void ssl_set_client_disabled(SSL *s)
1098         {
1099         CERT *c = s->cert;
1100         c->mask_a = 0;
1101         c->mask_k = 0;
1102         /* Don't allow TLS 1.2 only ciphers if we don't suppport them */
1103         if (!SSL_CLIENT_USE_TLS1_2_CIPHERS(s))
1104                 c->mask_ssl = SSL_TLSV1_2;
1105         else
1106                 c->mask_ssl = 0;
1107         ssl_set_sig_mask(&c->mask_a, s, SSL_SECOP_SIGALG_MASK);
1108         /* Disable static DH if we don't include any appropriate
1109          * signature algorithms.
1110          */
1111         if (c->mask_a & SSL_aRSA)
1112                 c->mask_k |= SSL_kDHr|SSL_kECDHr;
1113         if (c->mask_a & SSL_aDSS)
1114                 c->mask_k |= SSL_kDHd;
1115         if (c->mask_a & SSL_aECDSA)
1116                 c->mask_k |= SSL_kECDHe;
1117 #ifndef OPENSSL_NO_KRB5
1118         if (!kssl_tgt_is_available(s->kssl_ctx))
1119                 {
1120                 c->mask_a |= SSL_aKRB5;
1121                 c->mask_k |= SSL_kKRB5;
1122                 }
1123 #endif
1124 #ifndef OPENSSL_NO_PSK
1125         /* with PSK there must be client callback set */
1126         if (!s->psk_client_callback)
1127                 {
1128                 c->mask_a |= SSL_aPSK;
1129                 c->mask_k |= SSL_kPSK;
1130                 }
1131 #endif /* OPENSSL_NO_PSK */
1132 #ifndef OPENSSL_NO_SRP
1133         if (!(s->srp_ctx.srp_Mask & SSL_kSRP))
1134                 {
1135                 c->mask_a |= SSL_aSRP;
1136                 c->mask_k |= SSL_kSRP;
1137                 }
1138 #endif
1139         c->valid = 1;
1140         }
1141
1142 int ssl_cipher_disabled(SSL *s, const SSL_CIPHER *c, int op)
1143         {
1144         CERT *ct = s->cert;
1145         if (c->algorithm_ssl & ct->mask_ssl || c->algorithm_mkey & ct->mask_k || c->algorithm_auth & ct->mask_a)
1146                 return 1;
1147         return !ssl_security(s, op, c->strength_bits, 0, (void *)c);
1148         }
1149
1150 static int tls_use_ticket(SSL *s)
1151         {
1152         if (s->options & SSL_OP_NO_TICKET)
1153                 return 0;
1154         return ssl_security(s, SSL_SECOP_TICKET, 0, 0, NULL);
1155         }
1156
1157 unsigned char *ssl_add_clienthello_tlsext(SSL *s, unsigned char *buf, unsigned char *limit, int *al)
1158         {
1159         int extdatalen=0;
1160         unsigned char *orig = buf;
1161         unsigned char *ret = buf;
1162 #ifndef OPENSSL_NO_EC
1163         /* See if we support any ECC ciphersuites */
1164         int using_ecc = 0;
1165         if (s->version >= TLS1_VERSION || SSL_IS_DTLS(s))
1166                 {
1167                 int i;
1168                 unsigned long alg_k, alg_a;
1169                 STACK_OF(SSL_CIPHER) *cipher_stack = SSL_get_ciphers(s);
1170
1171                 for (i = 0; i < sk_SSL_CIPHER_num(cipher_stack); i++)
1172                         {
1173                         SSL_CIPHER *c = sk_SSL_CIPHER_value(cipher_stack, i);
1174
1175                         alg_k = c->algorithm_mkey;
1176                         alg_a = c->algorithm_auth;
1177                         if ((alg_k & (SSL_kECDHE|SSL_kECDHr|SSL_kECDHe)
1178                                 || (alg_a & SSL_aECDSA)))
1179                                 {
1180                                 using_ecc = 1;
1181                                 break;
1182                                 }
1183                         }
1184                 }
1185 #endif
1186
1187         ret+=2;
1188
1189         if (ret>=limit) return NULL; /* this really never occurs, but ... */
1190
1191         /* Add RI if renegotiating */
1192         if (s->renegotiate)
1193           {
1194           int el;
1195
1196           if(!ssl_add_clienthello_renegotiate_ext(s, 0, &el, 0))
1197               {
1198               SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1199               return NULL;
1200               }
1201
1202           if((limit - ret - 4 - el) < 0) return NULL;
1203
1204           s2n(TLSEXT_TYPE_renegotiate,ret);
1205           s2n(el,ret);
1206
1207           if(!ssl_add_clienthello_renegotiate_ext(s, ret, &el, el))
1208               {
1209               SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1210               return NULL;
1211               }
1212
1213           ret += el;
1214         }
1215         /* Only add RI for SSLv3 */
1216         if (s->client_version == SSL3_VERSION)
1217                 goto done;
1218
1219         if (s->tlsext_hostname != NULL)
1220                 {
1221                 /* Add TLS extension servername to the Client Hello message */
1222                 unsigned long size_str;
1223                 long lenmax;
1224
1225                 /*-
1226                  * check for enough space.
1227                  * 4 for the servername type and entension length
1228                  * 2 for servernamelist length
1229                  * 1 for the hostname type
1230                  * 2 for hostname length
1231                  * + hostname length
1232                  */
1233
1234                 if ((lenmax = limit - ret - 9) < 0
1235                     || (size_str = strlen(s->tlsext_hostname)) > (unsigned long)lenmax)
1236                         return NULL;
1237
1238                 /* extension type and length */
1239                 s2n(TLSEXT_TYPE_server_name,ret);
1240                 s2n(size_str+5,ret);
1241
1242                 /* length of servername list */
1243                 s2n(size_str+3,ret);
1244
1245                 /* hostname type, length and hostname */
1246                 *(ret++) = (unsigned char) TLSEXT_NAMETYPE_host_name;
1247                 s2n(size_str,ret);
1248                 memcpy(ret, s->tlsext_hostname, size_str);
1249                 ret+=size_str;
1250                 }
1251
1252 #ifndef OPENSSL_NO_SRP
1253         /* Add SRP username if there is one */
1254         if (s->srp_ctx.login != NULL)
1255                 { /* Add TLS extension SRP username to the Client Hello message */
1256
1257                 int login_len = strlen(s->srp_ctx.login);
1258                 if (login_len > 255 || login_len == 0)
1259                         {
1260                         SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1261                         return NULL;
1262                         }
1263
1264                 /*-
1265                  * check for enough space.
1266                  * 4 for the srp type type and entension length
1267                  * 1 for the srp user identity
1268                  * + srp user identity length
1269                  */
1270                 if ((limit - ret - 5 - login_len) < 0) return NULL;
1271
1272                 /* fill in the extension */
1273                 s2n(TLSEXT_TYPE_srp,ret);
1274                 s2n(login_len+1,ret);
1275                 (*ret++) = (unsigned char) login_len;
1276                 memcpy(ret, s->srp_ctx.login, login_len);
1277                 ret+=login_len;
1278                 }
1279 #endif
1280
1281 #ifndef OPENSSL_NO_EC
1282         if (using_ecc)
1283                 {
1284                 /* Add TLS extension ECPointFormats to the ClientHello message */
1285                 long lenmax;
1286                 const unsigned char *pcurves, *pformats;
1287                 size_t num_curves, num_formats, curves_list_len;
1288                 size_t i;
1289                 unsigned char *etmp;
1290
1291                 tls1_get_formatlist(s, &pformats, &num_formats);
1292
1293                 if ((lenmax = limit - ret - 5) < 0) return NULL;
1294                 if (num_formats > (size_t)lenmax) return NULL;
1295                 if (num_formats > 255)
1296                         {
1297                         SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1298                         return NULL;
1299                         }
1300
1301                 s2n(TLSEXT_TYPE_ec_point_formats,ret);
1302                 /* The point format list has 1-byte length. */
1303                 s2n(num_formats + 1,ret);
1304                 *(ret++) = (unsigned char)num_formats ;
1305                 memcpy(ret, pformats, num_formats);
1306                 ret+=num_formats;
1307
1308                 /* Add TLS extension EllipticCurves to the ClientHello message */
1309                 pcurves = s->tlsext_ellipticcurvelist;
1310                 if (!tls1_get_curvelist(s, 0, &pcurves, &num_curves))
1311                         return NULL;
1312
1313                 if ((lenmax = limit - ret - 6) < 0) return NULL;
1314                 if (num_curves > (size_t)lenmax / 2) return NULL;
1315                 if (num_curves > 65532 / 2)
1316                         {
1317                         SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1318                         return NULL;
1319                         }
1320
1321
1322                 s2n(TLSEXT_TYPE_elliptic_curves,ret);
1323                 etmp = ret + 4;
1324                 /* Copy curve ID if supported */
1325                 for (i = 0; i < num_curves; i++, pcurves += 2)
1326                         {
1327                         if (tls_curve_allowed(s, pcurves, SSL_SECOP_CURVE_SUPPORTED))
1328                                 {
1329                                 *etmp++ = pcurves[0];
1330                                 *etmp++ = pcurves[1];
1331                                 }
1332                         }
1333
1334                 curves_list_len = etmp - ret - 4;
1335
1336                 s2n(curves_list_len + 2, ret);
1337                 s2n(curves_list_len, ret);
1338                 ret += curves_list_len;
1339                 }
1340 #endif /* OPENSSL_NO_EC */
1341
1342         if (tls_use_ticket(s))
1343                 {
1344                 int ticklen;
1345                 if (!s->new_session && s->session && s->session->tlsext_tick)
1346                         ticklen = s->session->tlsext_ticklen;
1347                 else if (s->session && s->tlsext_session_ticket &&
1348                          s->tlsext_session_ticket->data)
1349                         {
1350                         ticklen = s->tlsext_session_ticket->length;
1351                         s->session->tlsext_tick = OPENSSL_malloc(ticklen);
1352                         if (!s->session->tlsext_tick)
1353                                 return NULL;
1354                         memcpy(s->session->tlsext_tick,
1355                                s->tlsext_session_ticket->data,
1356                                ticklen);
1357                         s->session->tlsext_ticklen = ticklen;
1358                         }
1359                 else
1360                         ticklen = 0;
1361                 if (ticklen == 0 && s->tlsext_session_ticket &&
1362                     s->tlsext_session_ticket->data == NULL)
1363                         goto skip_ext;
1364                 /* Check for enough room 2 for extension type, 2 for len
1365                  * rest for ticket
1366                  */
1367                 if ((long)(limit - ret - 4 - ticklen) < 0) return NULL;
1368                 s2n(TLSEXT_TYPE_session_ticket,ret);
1369                 s2n(ticklen,ret);
1370                 if (ticklen)
1371                         {
1372                         memcpy(ret, s->session->tlsext_tick, ticklen);
1373                         ret += ticklen;
1374                         }
1375                 }
1376                 skip_ext:
1377
1378         if (SSL_USE_SIGALGS(s))
1379                 {
1380                 size_t salglen;
1381                 const unsigned char *salg;
1382                 unsigned char *etmp;
1383                 salglen = tls12_get_psigalgs(s, &salg);
1384                 if ((size_t)(limit - ret) < salglen + 6)
1385                         return NULL;
1386                 s2n(TLSEXT_TYPE_signature_algorithms,ret);
1387                 etmp = ret;
1388                 /* Skip over lengths for now */
1389                 ret += 4;
1390                 salglen = tls12_copy_sigalgs(s, ret, salg, salglen);
1391                 /* Fill in lengths */
1392                 s2n(salglen + 2, etmp);
1393                 s2n(salglen, etmp);
1394                 ret += salglen;
1395                 }
1396
1397 #ifdef TLSEXT_TYPE_opaque_prf_input
1398         if (s->s3->client_opaque_prf_input != NULL)
1399                 {
1400                 size_t col = s->s3->client_opaque_prf_input_len;
1401
1402                 if ((long)(limit - ret - 6 - col) < 0)
1403                         return NULL;
1404                 if (col > 0xFFFD) /* can't happen */
1405                         return NULL;
1406
1407                 s2n(TLSEXT_TYPE_opaque_prf_input, ret);
1408                 s2n(col + 2, ret);
1409                 s2n(col, ret);
1410                 memcpy(ret, s->s3->client_opaque_prf_input, col);
1411                 ret += col;
1412                 }
1413 #endif
1414
1415         if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp)
1416                 {
1417                 int i;
1418                 long extlen, idlen, itmp;
1419                 OCSP_RESPID *id;
1420
1421                 idlen = 0;
1422                 for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++)
1423                         {
1424                         id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i);
1425                         itmp = i2d_OCSP_RESPID(id, NULL);
1426                         if (itmp <= 0)
1427                                 return NULL;
1428                         idlen += itmp + 2;
1429                         }
1430
1431                 if (s->tlsext_ocsp_exts)
1432                         {
1433                         extlen = i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, NULL);
1434                         if (extlen < 0)
1435                                 return NULL;
1436                         }
1437                 else
1438                         extlen = 0;
1439
1440                 if ((long)(limit - ret - 7 - extlen - idlen) < 0) return NULL;
1441                 s2n(TLSEXT_TYPE_status_request, ret);
1442                 if (extlen + idlen > 0xFFF0)
1443                         return NULL;
1444                 s2n(extlen + idlen + 5, ret);
1445                 *(ret++) = TLSEXT_STATUSTYPE_ocsp;
1446                 s2n(idlen, ret);
1447                 for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++)
1448                         {
1449                         /* save position of id len */
1450                         unsigned char *q = ret;
1451                         id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i);
1452                         /* skip over id len */
1453                         ret += 2;
1454                         itmp = i2d_OCSP_RESPID(id, &ret);
1455                         /* write id len */
1456                         s2n(itmp, q);
1457                         }
1458                 s2n(extlen, ret);
1459                 if (extlen > 0)
1460                         i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, &ret);
1461                 }
1462
1463 #ifndef OPENSSL_NO_HEARTBEATS
1464         /* Add Heartbeat extension */
1465         if ((limit - ret - 4 - 1) < 0)
1466                 return NULL;
1467         s2n(TLSEXT_TYPE_heartbeat,ret);
1468         s2n(1,ret);
1469         /*-
1470          * Set mode:
1471          * 1: peer may send requests
1472          * 2: peer not allowed to send requests
1473          */
1474         if (s->tlsext_heartbeat & SSL_TLSEXT_HB_DONT_RECV_REQUESTS)
1475                 *(ret++) = SSL_TLSEXT_HB_DONT_SEND_REQUESTS;
1476         else
1477                 *(ret++) = SSL_TLSEXT_HB_ENABLED;
1478 #endif
1479
1480 #ifndef OPENSSL_NO_NEXTPROTONEG
1481         if (s->ctx->next_proto_select_cb && !s->s3->tmp.finish_md_len)
1482                 {
1483                 /* The client advertises an emtpy extension to indicate its
1484                  * support for Next Protocol Negotiation */
1485                 if (limit - ret - 4 < 0)
1486                         return NULL;
1487                 s2n(TLSEXT_TYPE_next_proto_neg,ret);
1488                 s2n(0,ret);
1489                 }
1490 #endif
1491
1492         if (s->alpn_client_proto_list && !s->s3->tmp.finish_md_len)
1493                 {
1494                 if ((size_t)(limit - ret) < 6 + s->alpn_client_proto_list_len)
1495                         return NULL;
1496                 s2n(TLSEXT_TYPE_application_layer_protocol_negotiation,ret);
1497                 s2n(2 + s->alpn_client_proto_list_len,ret);
1498                 s2n(s->alpn_client_proto_list_len,ret);
1499                 memcpy(ret, s->alpn_client_proto_list,
1500                        s->alpn_client_proto_list_len);
1501                 ret += s->alpn_client_proto_list_len;
1502                 }
1503
1504 #ifndef OPENSSL_NO_SRTP
1505         if(SSL_IS_DTLS(s) && SSL_get_srtp_profiles(s))
1506                 {
1507                 int el;
1508
1509                 ssl_add_clienthello_use_srtp_ext(s, 0, &el, 0);
1510
1511                 if((limit - ret - 4 - el) < 0) return NULL;
1512
1513                 s2n(TLSEXT_TYPE_use_srtp,ret);
1514                 s2n(el,ret);
1515
1516                 if(ssl_add_clienthello_use_srtp_ext(s, ret, &el, el))
1517                         {
1518                         SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1519                         return NULL;
1520                         }
1521                 ret += el;
1522                 }
1523 #endif
1524         custom_ext_init(&s->cert->cli_ext);
1525         /* Add custom TLS Extensions to ClientHello */
1526         if (!custom_ext_add(s, 0, &ret, limit, al))
1527                 return NULL;
1528 #ifdef TLSEXT_TYPE_encrypt_then_mac
1529         s2n(TLSEXT_TYPE_encrypt_then_mac,ret);
1530         s2n(0,ret);
1531 #endif
1532
1533         /* Add padding to workaround bugs in F5 terminators.
1534          * See https://tools.ietf.org/html/draft-agl-tls-padding-03
1535          *
1536          * NB: because this code works out the length of all existing
1537          * extensions it MUST always appear last.
1538          */
1539         if (s->options & SSL_OP_TLSEXT_PADDING)
1540                 {
1541                 int hlen = ret - (unsigned char *)s->init_buf->data;
1542                 /* The code in s23_clnt.c to build ClientHello messages
1543                  * includes the 5-byte record header in the buffer, while
1544                  * the code in s3_clnt.c does not.
1545                  */
1546                 if (s->state == SSL23_ST_CW_CLNT_HELLO_A)
1547                         hlen -= 5;
1548                 if (hlen > 0xff && hlen < 0x200)
1549                         {
1550                         hlen = 0x200 - hlen;
1551                         if (hlen >= 4)
1552                                 hlen -= 4;
1553                         else
1554                                 hlen = 0;
1555
1556                         s2n(TLSEXT_TYPE_padding, ret);
1557                         s2n(hlen, ret);
1558                         memset(ret, 0, hlen);
1559                         ret += hlen;
1560                         }
1561                 }
1562
1563         done:
1564
1565         if ((extdatalen = ret-orig-2)== 0)
1566                 return orig;
1567
1568         s2n(extdatalen, orig);
1569         return ret;
1570         }
1571
1572 unsigned char *ssl_add_serverhello_tlsext(SSL *s, unsigned char *buf, unsigned char *limit, int *al)
1573         {
1574         int extdatalen=0;
1575         unsigned char *orig = buf;
1576         unsigned char *ret = buf;
1577 #ifndef OPENSSL_NO_NEXTPROTONEG
1578         int next_proto_neg_seen;
1579 #endif
1580 #ifndef OPENSSL_NO_EC
1581         unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
1582         unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth;
1583         int using_ecc = (alg_k & (SSL_kECDHE|SSL_kECDHr|SSL_kECDHe)) || (alg_a & SSL_aECDSA);
1584         using_ecc = using_ecc && (s->session->tlsext_ecpointformatlist != NULL);
1585 #endif
1586
1587         ret+=2;
1588         if (ret>=limit) return NULL; /* this really never occurs, but ... */
1589
1590         if(s->s3->send_connection_binding)
1591         {
1592           int el;
1593
1594           if(!ssl_add_serverhello_renegotiate_ext(s, 0, &el, 0))
1595               {
1596               SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1597               return NULL;
1598               }
1599
1600           if((limit - ret - 4 - el) < 0) return NULL;
1601
1602           s2n(TLSEXT_TYPE_renegotiate,ret);
1603           s2n(el,ret);
1604
1605           if(!ssl_add_serverhello_renegotiate_ext(s, ret, &el, el))
1606               {
1607               SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1608               return NULL;
1609               }
1610
1611           ret += el;
1612         }
1613
1614         /* Only add RI for SSLv3 */
1615         if (s->version == SSL3_VERSION)
1616                 goto done;
1617
1618         if (!s->hit && s->servername_done == 1 && s->session->tlsext_hostname != NULL)
1619                 {
1620                 if ((long)(limit - ret - 4) < 0) return NULL;
1621
1622                 s2n(TLSEXT_TYPE_server_name,ret);
1623                 s2n(0,ret);
1624                 }
1625
1626 #ifndef OPENSSL_NO_EC
1627         if (using_ecc)
1628                 {
1629                 const unsigned char *plist;
1630                 size_t plistlen;
1631                 /* Add TLS extension ECPointFormats to the ServerHello message */
1632                 long lenmax;
1633
1634                 tls1_get_formatlist(s, &plist, &plistlen);
1635
1636                 if ((lenmax = limit - ret - 5) < 0) return NULL;
1637                 if (plistlen > (size_t)lenmax) return NULL;
1638                 if (plistlen > 255)
1639                         {
1640                         SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1641                         return NULL;
1642                         }
1643
1644                 s2n(TLSEXT_TYPE_ec_point_formats,ret);
1645                 s2n(plistlen + 1,ret);
1646                 *(ret++) = (unsigned char) plistlen;
1647                 memcpy(ret, plist, plistlen);
1648                 ret+=plistlen;
1649
1650                 }
1651         /* Currently the server should not respond with a SupportedCurves extension */
1652 #endif /* OPENSSL_NO_EC */
1653
1654         if (s->tlsext_ticket_expected && tls_use_ticket(s))
1655                 {
1656                 if ((long)(limit - ret - 4) < 0) return NULL;
1657                 s2n(TLSEXT_TYPE_session_ticket,ret);
1658                 s2n(0,ret);
1659                 }
1660
1661         if (s->tlsext_status_expected)
1662                 {
1663                 if ((long)(limit - ret - 4) < 0) return NULL;
1664                 s2n(TLSEXT_TYPE_status_request,ret);
1665                 s2n(0,ret);
1666                 }
1667
1668 #ifdef TLSEXT_TYPE_opaque_prf_input
1669         if (s->s3->server_opaque_prf_input != NULL)
1670                 {
1671                 size_t sol = s->s3->server_opaque_prf_input_len;
1672
1673                 if ((long)(limit - ret - 6 - sol) < 0)
1674                         return NULL;
1675                 if (sol > 0xFFFD) /* can't happen */
1676                         return NULL;
1677
1678                 s2n(TLSEXT_TYPE_opaque_prf_input, ret);
1679                 s2n(sol + 2, ret);
1680                 s2n(sol, ret);
1681                 memcpy(ret, s->s3->server_opaque_prf_input, sol);
1682                 ret += sol;
1683                 }
1684 #endif
1685
1686 #ifndef OPENSSL_NO_SRTP
1687         if(SSL_IS_DTLS(s) && s->srtp_profile)
1688                 {
1689                 int el;
1690
1691                 ssl_add_serverhello_use_srtp_ext(s, 0, &el, 0);
1692
1693                 if((limit - ret - 4 - el) < 0) return NULL;
1694
1695                 s2n(TLSEXT_TYPE_use_srtp,ret);
1696                 s2n(el,ret);
1697
1698                 if(ssl_add_serverhello_use_srtp_ext(s, ret, &el, el))
1699                         {
1700                         SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1701                         return NULL;
1702                         }
1703                 ret+=el;
1704                 }
1705 #endif
1706
1707         if (((s->s3->tmp.new_cipher->id & 0xFFFF)==0x80 || (s->s3->tmp.new_cipher->id & 0xFFFF)==0x81)
1708                 && (SSL_get_options(s) & SSL_OP_CRYPTOPRO_TLSEXT_BUG))
1709                 { const unsigned char cryptopro_ext[36] = {
1710                         0xfd, 0xe8, /*65000*/
1711                         0x00, 0x20, /*32 bytes length*/
1712                         0x30, 0x1e, 0x30, 0x08, 0x06, 0x06, 0x2a, 0x85,
1713                         0x03,   0x02, 0x02, 0x09, 0x30, 0x08, 0x06, 0x06,
1714                         0x2a, 0x85, 0x03, 0x02, 0x02, 0x16, 0x30, 0x08,
1715                         0x06, 0x06, 0x2a, 0x85, 0x03, 0x02, 0x02, 0x17};
1716                         if (limit-ret<36) return NULL;
1717                         memcpy(ret,cryptopro_ext,36);
1718                         ret+=36;
1719
1720                 }
1721
1722 #ifndef OPENSSL_NO_HEARTBEATS
1723         /* Add Heartbeat extension if we've received one */
1724         if (s->tlsext_heartbeat & SSL_TLSEXT_HB_ENABLED)
1725                 {
1726                 if ((limit - ret - 4 - 1) < 0)
1727                         return NULL;
1728                 s2n(TLSEXT_TYPE_heartbeat,ret);
1729                 s2n(1,ret);
1730                 /*-
1731                  * Set mode:
1732                  * 1: peer may send requests
1733                  * 2: peer not allowed to send requests
1734                  */
1735                 if (s->tlsext_heartbeat & SSL_TLSEXT_HB_DONT_RECV_REQUESTS)
1736                         *(ret++) = SSL_TLSEXT_HB_DONT_SEND_REQUESTS;
1737                 else
1738                         *(ret++) = SSL_TLSEXT_HB_ENABLED;
1739
1740                 }
1741 #endif
1742
1743 #ifndef OPENSSL_NO_NEXTPROTONEG
1744         next_proto_neg_seen = s->s3->next_proto_neg_seen;
1745         s->s3->next_proto_neg_seen = 0;
1746         if (next_proto_neg_seen && s->ctx->next_protos_advertised_cb)
1747                 {
1748                 const unsigned char *npa;
1749                 unsigned int npalen;
1750                 int r;
1751
1752                 r = s->ctx->next_protos_advertised_cb(s, &npa, &npalen, s->ctx->next_protos_advertised_cb_arg);
1753                 if (r == SSL_TLSEXT_ERR_OK)
1754                         {
1755                         if ((long)(limit - ret - 4 - npalen) < 0) return NULL;
1756                         s2n(TLSEXT_TYPE_next_proto_neg,ret);
1757                         s2n(npalen,ret);
1758                         memcpy(ret, npa, npalen);
1759                         ret += npalen;
1760                         s->s3->next_proto_neg_seen = 1;
1761                         }
1762                 }
1763 #endif
1764         if (!custom_ext_add(s, 1, &ret, limit, al))
1765                 return NULL;
1766 #ifdef TLSEXT_TYPE_encrypt_then_mac
1767         if (s->s3->flags & TLS1_FLAGS_ENCRYPT_THEN_MAC)
1768                 {
1769                 /* Don't use encrypt_then_mac if AEAD or RC4
1770                  * might want to disable for other cases too.
1771                  */
1772                 if (s->s3->tmp.new_cipher->algorithm_mac == SSL_AEAD
1773                     || s->s3->tmp.new_cipher->algorithm_enc == SSL_RC4)
1774                         s->s3->flags &= ~TLS1_FLAGS_ENCRYPT_THEN_MAC;
1775                 else
1776                         {
1777                         s2n(TLSEXT_TYPE_encrypt_then_mac,ret);
1778                         s2n(0,ret);
1779                         }
1780                 }
1781 #endif
1782
1783         if (s->s3->alpn_selected)
1784                 {
1785                 const unsigned char *selected = s->s3->alpn_selected;
1786                 unsigned len = s->s3->alpn_selected_len;
1787
1788                 if ((long)(limit - ret - 4 - 2 - 1 - len) < 0)
1789                         return NULL;
1790                 s2n(TLSEXT_TYPE_application_layer_protocol_negotiation,ret);
1791                 s2n(3 + len,ret);
1792                 s2n(1 + len,ret);
1793                 *ret++ = len;
1794                 memcpy(ret, selected, len);
1795                 ret += len;
1796                 }
1797
1798         done:
1799
1800         if ((extdatalen = ret-orig-2)== 0)
1801                 return orig;
1802
1803         s2n(extdatalen, orig);
1804         return ret;
1805         }
1806
1807 /* tls1_alpn_handle_client_hello is called to process the ALPN extension in a
1808  * ClientHello.
1809  *   data: the contents of the extension, not including the type and length.
1810  *   data_len: the number of bytes in |data|
1811  *   al: a pointer to the alert value to send in the event of a non-zero
1812  *       return.
1813  *
1814  *   returns: 0 on success. */
1815 static int tls1_alpn_handle_client_hello(SSL *s, const unsigned char *data,
1816                                          unsigned data_len, int *al)
1817         {
1818         unsigned i;
1819         unsigned proto_len;
1820         const unsigned char *selected;
1821         unsigned char selected_len;
1822         int r;
1823
1824         if (s->ctx->alpn_select_cb == NULL)
1825                 return 0;
1826
1827         if (data_len < 2)
1828                 goto parse_error;
1829
1830         /* data should contain a uint16 length followed by a series of 8-bit,
1831          * length-prefixed strings. */
1832         i = ((unsigned) data[0]) << 8 |
1833             ((unsigned) data[1]);
1834         data_len -= 2;
1835         data += 2;
1836         if (data_len != i)
1837                 goto parse_error;
1838
1839         if (data_len < 2)
1840                 goto parse_error;
1841
1842         for (i = 0; i < data_len;)
1843                 {
1844                 proto_len = data[i];
1845                 i++;
1846
1847                 if (proto_len == 0)
1848                         goto parse_error;
1849
1850                 if (i + proto_len < i || i + proto_len > data_len)
1851                         goto parse_error;
1852
1853                 i += proto_len;
1854                 }
1855
1856         r = s->ctx->alpn_select_cb(s, &selected, &selected_len, data, data_len,
1857                                    s->ctx->alpn_select_cb_arg);
1858         if (r == SSL_TLSEXT_ERR_OK) {
1859                 if (s->s3->alpn_selected)
1860                         OPENSSL_free(s->s3->alpn_selected);
1861                 s->s3->alpn_selected = OPENSSL_malloc(selected_len);
1862                 if (!s->s3->alpn_selected)
1863                         {
1864                         *al = SSL_AD_INTERNAL_ERROR;
1865                         return -1;
1866                         }
1867                 memcpy(s->s3->alpn_selected, selected, selected_len);
1868                 s->s3->alpn_selected_len = selected_len;
1869         }
1870         return 0;
1871
1872 parse_error:
1873         *al = SSL_AD_DECODE_ERROR;
1874         return -1;
1875         }
1876
1877 #ifndef OPENSSL_NO_EC
1878 /*-
1879  * ssl_check_for_safari attempts to fingerprint Safari using OS X
1880  * SecureTransport using the TLS extension block in |d|, of length |n|.
1881  * Safari, since 10.6, sends exactly these extensions, in this order:
1882  *   SNI,
1883  *   elliptic_curves
1884  *   ec_point_formats
1885  *
1886  * We wish to fingerprint Safari because they broke ECDHE-ECDSA support in 10.8,
1887  * but they advertise support. So enabling ECDHE-ECDSA ciphers breaks them.
1888  * Sadly we cannot differentiate 10.6, 10.7 and 10.8.4 (which work), from
1889  * 10.8..10.8.3 (which don't work).
1890  */
1891 static void ssl_check_for_safari(SSL *s, const unsigned char *data, const unsigned char *d, int n) {
1892         unsigned short type, size;
1893         static const unsigned char kSafariExtensionsBlock[] = {
1894                 0x00, 0x0a,  /* elliptic_curves extension */
1895                 0x00, 0x08,  /* 8 bytes */
1896                 0x00, 0x06,  /* 6 bytes of curve ids */
1897                 0x00, 0x17,  /* P-256 */
1898                 0x00, 0x18,  /* P-384 */
1899                 0x00, 0x19,  /* P-521 */
1900
1901                 0x00, 0x0b,  /* ec_point_formats */
1902                 0x00, 0x02,  /* 2 bytes */
1903                 0x01,        /* 1 point format */
1904                 0x00,        /* uncompressed */
1905         };
1906
1907         /* The following is only present in TLS 1.2 */
1908         static const unsigned char kSafariTLS12ExtensionsBlock[] = {
1909                 0x00, 0x0d,  /* signature_algorithms */
1910                 0x00, 0x0c,  /* 12 bytes */
1911                 0x00, 0x0a,  /* 10 bytes */
1912                 0x05, 0x01,  /* SHA-384/RSA */
1913                 0x04, 0x01,  /* SHA-256/RSA */
1914                 0x02, 0x01,  /* SHA-1/RSA */
1915                 0x04, 0x03,  /* SHA-256/ECDSA */
1916                 0x02, 0x03,  /* SHA-1/ECDSA */
1917         };
1918
1919         if (data >= (d+n-2))
1920                 return;
1921         data += 2;
1922
1923         if (data > (d+n-4))
1924                 return;
1925         n2s(data,type);
1926         n2s(data,size);
1927
1928         if (type != TLSEXT_TYPE_server_name)
1929                 return;
1930
1931         if (data+size > d+n)
1932                 return;
1933         data += size;
1934
1935         if (TLS1_get_client_version(s) >= TLS1_2_VERSION)
1936                 {
1937                 const size_t len1 = sizeof(kSafariExtensionsBlock);
1938                 const size_t len2 = sizeof(kSafariTLS12ExtensionsBlock);
1939
1940                 if (data + len1 + len2 != d+n)
1941                         return;
1942                 if (memcmp(data, kSafariExtensionsBlock, len1) != 0)
1943                         return;
1944                 if (memcmp(data + len1, kSafariTLS12ExtensionsBlock, len2) != 0)
1945                         return;
1946                 }
1947         else
1948                 {
1949                 const size_t len = sizeof(kSafariExtensionsBlock);
1950
1951                 if (data + len != d+n)
1952                         return;
1953                 if (memcmp(data, kSafariExtensionsBlock, len) != 0)
1954                         return;
1955                 }
1956
1957         s->s3->is_probably_safari = 1;
1958 }
1959 #endif /* !OPENSSL_NO_EC */
1960
1961
1962 static int ssl_scan_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al)
1963         {
1964         unsigned short type;
1965         unsigned short size;
1966         unsigned short len;
1967         unsigned char *data = *p;
1968         int renegotiate_seen = 0;
1969
1970         s->servername_done = 0;
1971         s->tlsext_status_type = -1;
1972 #ifndef OPENSSL_NO_NEXTPROTONEG
1973         s->s3->next_proto_neg_seen = 0;
1974 #endif
1975
1976         if (s->s3->alpn_selected)
1977                 {
1978                 OPENSSL_free(s->s3->alpn_selected);
1979                 s->s3->alpn_selected = NULL;
1980                 }
1981
1982 #ifndef OPENSSL_NO_HEARTBEATS
1983         s->tlsext_heartbeat &= ~(SSL_TLSEXT_HB_ENABLED |
1984                                SSL_TLSEXT_HB_DONT_SEND_REQUESTS);
1985 #endif
1986
1987 #ifndef OPENSSL_NO_EC
1988         if (s->options & SSL_OP_SAFARI_ECDHE_ECDSA_BUG)
1989                 ssl_check_for_safari(s, data, d, n);
1990 #endif /* !OPENSSL_NO_EC */
1991
1992         /* Clear any signature algorithms extension received */
1993         if (s->cert->peer_sigalgs)
1994                 {
1995                 OPENSSL_free(s->cert->peer_sigalgs);
1996                 s->cert->peer_sigalgs = NULL;
1997                 }
1998
1999 #ifdef TLSEXT_TYPE_encrypt_then_mac
2000         s->s3->flags &= ~TLS1_FLAGS_ENCRYPT_THEN_MAC;
2001 #endif
2002
2003 #ifndef OPENSSL_NO_SRP
2004         if (s->srp_ctx.login != NULL)
2005                 {
2006                 OPENSSL_free(s->srp_ctx.login);
2007                 s->srp_ctx.login = NULL;
2008                 }
2009 #endif
2010
2011         s->srtp_profile = NULL;
2012
2013         if (data >= (d+n-2))
2014                 goto ri_check;
2015         n2s(data,len);
2016
2017         if (data > (d+n-len))
2018                 goto ri_check;
2019
2020         while (data <= (d+n-4))
2021                 {
2022                 n2s(data,type);
2023                 n2s(data,size);
2024
2025                 if (data+size > (d+n))
2026                         goto ri_check;
2027 #if 0
2028                 fprintf(stderr,"Received extension type %d size %d\n",type,size);
2029 #endif
2030                 if (s->tlsext_debug_cb)
2031                         s->tlsext_debug_cb(s, 0, type, data, size,
2032                                                 s->tlsext_debug_arg);
2033                 if (type == TLSEXT_TYPE_renegotiate)
2034                         {
2035                         if(!ssl_parse_clienthello_renegotiate_ext(s, data, size, al))
2036                                 return 0;
2037                         renegotiate_seen = 1;
2038                         }
2039                 else if (s->version == SSL3_VERSION)
2040                         {}
2041 /*-
2042  * The servername extension is treated as follows:
2043  *
2044  * - Only the hostname type is supported with a maximum length of 255.
2045  * - The servername is rejected if too long or if it contains zeros,
2046  *   in which case an fatal alert is generated.
2047  * - The servername field is maintained together with the session cache.
2048  * - When a session is resumed, the servername call back invoked in order
2049  *   to allow the application to position itself to the right context.
2050  * - The servername is acknowledged if it is new for a session or when
2051  *   it is identical to a previously used for the same session.
2052  *   Applications can control the behaviour.  They can at any time
2053  *   set a 'desirable' servername for a new SSL object. This can be the
2054  *   case for example with HTTPS when a Host: header field is received and
2055  *   a renegotiation is requested. In this case, a possible servername
2056  *   presented in the new client hello is only acknowledged if it matches
2057  *   the value of the Host: field.
2058  * - Applications must  use SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
2059  *   if they provide for changing an explicit servername context for the
2060  *   session, i.e. when the session has been established with a servername
2061  *   extension.
2062  * - On session reconnect, the servername extension may be absent.
2063  *
2064  */
2065
2066                 else if (type == TLSEXT_TYPE_server_name)
2067                         {
2068                         unsigned char *sdata;
2069                         int servname_type;
2070                         int dsize;
2071
2072                         if (size < 2)
2073                                 {
2074                                 *al = SSL_AD_DECODE_ERROR;
2075                                 return 0;
2076                                 }
2077                         n2s(data,dsize);
2078                         size -= 2;
2079                         if (dsize > size  )
2080                                 {
2081                                 *al = SSL_AD_DECODE_ERROR;
2082                                 return 0;
2083                                 }
2084
2085                         sdata = data;
2086                         while (dsize > 3)
2087                                 {
2088                                 servname_type = *(sdata++);
2089                                 n2s(sdata,len);
2090                                 dsize -= 3;
2091
2092                                 if (len > dsize)
2093                                         {
2094                                         *al = SSL_AD_DECODE_ERROR;
2095                                         return 0;
2096                                         }
2097                                 if (s->servername_done == 0)
2098                                 switch (servname_type)
2099                                         {
2100                                 case TLSEXT_NAMETYPE_host_name:
2101                                         if (!s->hit)
2102                                                 {
2103                                                 if(s->session->tlsext_hostname)
2104                                                         {
2105                                                         *al = SSL_AD_DECODE_ERROR;
2106                                                         return 0;
2107                                                         }
2108                                                 if (len > TLSEXT_MAXLEN_host_name)
2109                                                         {
2110                                                         *al = TLS1_AD_UNRECOGNIZED_NAME;
2111                                                         return 0;
2112                                                         }
2113                                                 if ((s->session->tlsext_hostname = OPENSSL_malloc(len+1)) == NULL)
2114                                                         {
2115                                                         *al = TLS1_AD_INTERNAL_ERROR;
2116                                                         return 0;
2117                                                         }
2118                                                 memcpy(s->session->tlsext_hostname, sdata, len);
2119                                                 s->session->tlsext_hostname[len]='\0';
2120                                                 if (strlen(s->session->tlsext_hostname) != len) {
2121                                                         OPENSSL_free(s->session->tlsext_hostname);
2122                                                         s->session->tlsext_hostname = NULL;
2123                                                         *al = TLS1_AD_UNRECOGNIZED_NAME;
2124                                                         return 0;
2125                                                 }
2126                                                 s->servername_done = 1;
2127
2128                                                 }
2129                                         else
2130                                                 s->servername_done = s->session->tlsext_hostname
2131                                                         && strlen(s->session->tlsext_hostname) == len
2132                                                         && strncmp(s->session->tlsext_hostname, (char *)sdata, len) == 0;
2133
2134                                         break;
2135
2136                                 default:
2137                                         break;
2138                                         }
2139
2140                                 dsize -= len;
2141                                 }
2142                         if (dsize != 0)
2143                                 {
2144                                 *al = SSL_AD_DECODE_ERROR;
2145                                 return 0;
2146                                 }
2147
2148                         }
2149 #ifndef OPENSSL_NO_SRP
2150                 else if (type == TLSEXT_TYPE_srp)
2151                         {
2152                         if (size <= 0 || ((len = data[0])) != (size -1))
2153                                 {
2154                                 *al = SSL_AD_DECODE_ERROR;
2155                                 return 0;
2156                                 }
2157                         if (s->srp_ctx.login != NULL)
2158                                 {
2159                                 *al = SSL_AD_DECODE_ERROR;
2160                                 return 0;
2161                                 }
2162                         if ((s->srp_ctx.login = OPENSSL_malloc(len+1)) == NULL)
2163                                 return -1;
2164                         memcpy(s->srp_ctx.login, &data[1], len);
2165                         s->srp_ctx.login[len]='\0';
2166
2167                         if (strlen(s->srp_ctx.login) != len)
2168                                 {
2169                                 *al = SSL_AD_DECODE_ERROR;
2170                                 return 0;
2171                                 }
2172                         }
2173 #endif
2174
2175 #ifndef OPENSSL_NO_EC
2176                 else if (type == TLSEXT_TYPE_ec_point_formats)
2177                         {
2178                         unsigned char *sdata = data;
2179                         int ecpointformatlist_length = *(sdata++);
2180
2181                         if (ecpointformatlist_length != size - 1 ||
2182                                 ecpointformatlist_length < 1)
2183                                 {
2184                                 *al = TLS1_AD_DECODE_ERROR;
2185                                 return 0;
2186                                 }
2187                         if (!s->hit)
2188                                 {
2189                                 if(s->session->tlsext_ecpointformatlist)
2190                                         {
2191                                         OPENSSL_free(s->session->tlsext_ecpointformatlist);
2192                                         s->session->tlsext_ecpointformatlist = NULL;
2193                                         }
2194                                 s->session->tlsext_ecpointformatlist_length = 0;
2195                                 if ((s->session->tlsext_ecpointformatlist = OPENSSL_malloc(ecpointformatlist_length)) == NULL)
2196                                         {
2197                                         *al = TLS1_AD_INTERNAL_ERROR;
2198                                         return 0;
2199                                         }
2200                                 s->session->tlsext_ecpointformatlist_length = ecpointformatlist_length;
2201                                 memcpy(s->session->tlsext_ecpointformatlist, sdata, ecpointformatlist_length);
2202                                 }
2203 #if 0
2204                         fprintf(stderr,"ssl_parse_clienthello_tlsext s->session->tlsext_ecpointformatlist (length=%i) ", s->session->tlsext_ecpointformatlist_length);
2205                         sdata = s->session->tlsext_ecpointformatlist;
2206                         for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
2207                                 fprintf(stderr,"%i ",*(sdata++));
2208                         fprintf(stderr,"\n");
2209 #endif
2210                         }
2211                 else if (type == TLSEXT_TYPE_elliptic_curves)
2212                         {
2213                         unsigned char *sdata = data;
2214                         int ellipticcurvelist_length = (*(sdata++) << 8);
2215                         ellipticcurvelist_length += (*(sdata++));
2216
2217                         if (ellipticcurvelist_length != size - 2 ||
2218                                 ellipticcurvelist_length < 1 ||
2219                                 /* Each NamedCurve is 2 bytes. */
2220                                 ellipticcurvelist_length & 1)
2221                                 {
2222                                 *al = TLS1_AD_DECODE_ERROR;
2223                                 return 0;
2224                                 }
2225                         if (!s->hit)
2226                                 {
2227                                 if(s->session->tlsext_ellipticcurvelist)
2228                                         {
2229                                         *al = TLS1_AD_DECODE_ERROR;
2230                                         return 0;
2231                                         }
2232                                 s->session->tlsext_ellipticcurvelist_length = 0;
2233                                 if ((s->session->tlsext_ellipticcurvelist = OPENSSL_malloc(ellipticcurvelist_length)) == NULL)
2234                                         {
2235                                         *al = TLS1_AD_INTERNAL_ERROR;
2236                                         return 0;
2237                                         }
2238                                 s->session->tlsext_ellipticcurvelist_length = ellipticcurvelist_length;
2239                                 memcpy(s->session->tlsext_ellipticcurvelist, sdata, ellipticcurvelist_length);
2240                                 }
2241 #if 0
2242                         fprintf(stderr,"ssl_parse_clienthello_tlsext s->session->tlsext_ellipticcurvelist (length=%i) ", s->session->tlsext_ellipticcurvelist_length);
2243                         sdata = s->session->tlsext_ellipticcurvelist;
2244                         for (i = 0; i < s->session->tlsext_ellipticcurvelist_length; i++)
2245                                 fprintf(stderr,"%i ",*(sdata++));
2246                         fprintf(stderr,"\n");
2247 #endif
2248                         }
2249 #endif /* OPENSSL_NO_EC */
2250 #ifdef TLSEXT_TYPE_opaque_prf_input
2251                 else if (type == TLSEXT_TYPE_opaque_prf_input)
2252                         {
2253                         unsigned char *sdata = data;
2254
2255                         if (size < 2)
2256                                 {
2257                                 *al = SSL_AD_DECODE_ERROR;
2258                                 return 0;
2259                                 }
2260                         n2s(sdata, s->s3->client_opaque_prf_input_len);
2261                         if (s->s3->client_opaque_prf_input_len != size - 2)
2262                                 {
2263                                 *al = SSL_AD_DECODE_ERROR;
2264                                 return 0;
2265                                 }
2266
2267                         if (s->s3->client_opaque_prf_input != NULL) /* shouldn't really happen */
2268                                 OPENSSL_free(s->s3->client_opaque_prf_input);
2269
2270                         /* dummy byte just to get non-NULL */
2271                         if (s->s3->client_opaque_prf_input_len == 0)
2272                                 s->s3->client_opaque_prf_input = OPENSSL_malloc(1);
2273                         else
2274                                 s->s3->client_opaque_prf_input = BUF_memdup(sdata, s->s3->client_opaque_prf_input_len);
2275                         if (s->s3->client_opaque_prf_input == NULL)
2276                                 {
2277                                 *al = TLS1_AD_INTERNAL_ERROR;
2278                                 return 0;
2279                                 }
2280                         }
2281 #endif
2282                 else if (type == TLSEXT_TYPE_session_ticket)
2283                         {
2284                         if (s->tls_session_ticket_ext_cb &&
2285                             !s->tls_session_ticket_ext_cb(s, data, size, s->tls_session_ticket_ext_cb_arg))
2286                                 {
2287                                 *al = TLS1_AD_INTERNAL_ERROR;
2288                                 return 0;
2289                                 }
2290                         }
2291                 else if (type == TLSEXT_TYPE_signature_algorithms)
2292                         {
2293                         int dsize;
2294                         if (s->cert->peer_sigalgs || size < 2)
2295                                 {
2296                                 *al = SSL_AD_DECODE_ERROR;
2297                                 return 0;
2298                                 }
2299                         n2s(data,dsize);
2300                         size -= 2;
2301                         if (dsize != size || dsize & 1 || !dsize)
2302                                 {
2303                                 *al = SSL_AD_DECODE_ERROR;
2304                                 return 0;
2305                                 }
2306                         if (!tls1_save_sigalgs(s, data, dsize))
2307                                 {
2308                                 *al = SSL_AD_DECODE_ERROR;
2309                                 return 0;
2310                                 }
2311                         }
2312                 else if (type == TLSEXT_TYPE_status_request)
2313                         {
2314
2315                         if (size < 5)
2316                                 {
2317                                 *al = SSL_AD_DECODE_ERROR;
2318                                 return 0;
2319                                 }
2320
2321                         s->tlsext_status_type = *data++;
2322                         size--;
2323                         if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp)
2324                                 {
2325                                 const unsigned char *sdata;
2326                                 int dsize;
2327                                 /* Read in responder_id_list */
2328                                 n2s(data,dsize);
2329                                 size -= 2;
2330                                 if (dsize > size  )
2331                                         {
2332                                         *al = SSL_AD_DECODE_ERROR;
2333                                         return 0;
2334                                         }
2335                                 while (dsize > 0)
2336                                         {
2337                                         OCSP_RESPID *id;
2338                                         int idsize;
2339                                         if (dsize < 4)
2340                                                 {
2341                                                 *al = SSL_AD_DECODE_ERROR;
2342                                                 return 0;
2343                                                 }
2344                                         n2s(data, idsize);
2345                                         dsize -= 2 + idsize;
2346                                         size -= 2 + idsize;
2347                                         if (dsize < 0)
2348                                                 {
2349                                                 *al = SSL_AD_DECODE_ERROR;
2350                                                 return 0;
2351                                                 }
2352                                         sdata = data;
2353                                         data += idsize;
2354                                         id = d2i_OCSP_RESPID(NULL,
2355                                                                 &sdata, idsize);
2356                                         if (!id)
2357                                                 {
2358                                                 *al = SSL_AD_DECODE_ERROR;
2359                                                 return 0;
2360                                                 }
2361                                         if (data != sdata)
2362                                                 {
2363                                                 OCSP_RESPID_free(id);
2364                                                 *al = SSL_AD_DECODE_ERROR;
2365                                                 return 0;
2366                                                 }
2367                                         if (!s->tlsext_ocsp_ids
2368                                                 && !(s->tlsext_ocsp_ids =
2369                                                 sk_OCSP_RESPID_new_null()))
2370                                                 {
2371                                                 OCSP_RESPID_free(id);
2372                                                 *al = SSL_AD_INTERNAL_ERROR;
2373                                                 return 0;
2374                                                 }
2375                                         if (!sk_OCSP_RESPID_push(
2376                                                         s->tlsext_ocsp_ids, id))
2377                                                 {
2378                                                 OCSP_RESPID_free(id);
2379                                                 *al = SSL_AD_INTERNAL_ERROR;
2380                                                 return 0;
2381                                                 }
2382                                         }
2383
2384                                 /* Read in request_extensions */
2385                                 if (size < 2)
2386                                         {
2387                                         *al = SSL_AD_DECODE_ERROR;
2388                                         return 0;
2389                                         }
2390                                 n2s(data,dsize);
2391                                 size -= 2;
2392                                 if (dsize != size)
2393                                         {
2394                                         *al = SSL_AD_DECODE_ERROR;
2395                                         return 0;
2396                                         }
2397                                 sdata = data;
2398                                 if (dsize > 0)
2399                                         {
2400                                         if (s->tlsext_ocsp_exts)
2401                                                 {
2402                                                 sk_X509_EXTENSION_pop_free(s->tlsext_ocsp_exts,
2403                                                                            X509_EXTENSION_free);
2404                                                 }
2405
2406                                         s->tlsext_ocsp_exts =
2407                                                 d2i_X509_EXTENSIONS(NULL,
2408                                                         &sdata, dsize);
2409                                         if (!s->tlsext_ocsp_exts
2410                                                 || (data + dsize != sdata))
2411                                                 {
2412                                                 *al = SSL_AD_DECODE_ERROR;
2413                                                 return 0;
2414                                                 }
2415                                         }
2416                                 }
2417                                 /* We don't know what to do with any other type
2418                                 * so ignore it.
2419                                 */
2420                                 else
2421                                         s->tlsext_status_type = -1;
2422                         }
2423 #ifndef OPENSSL_NO_HEARTBEATS
2424                 else if (type == TLSEXT_TYPE_heartbeat)
2425                         {
2426                         switch(data[0])
2427                                 {
2428                                 case 0x01:      /* Client allows us to send HB requests */
2429                                                         s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED;
2430                                                         break;
2431                                 case 0x02:      /* Client doesn't accept HB requests */
2432                                                         s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED;
2433                                                         s->tlsext_heartbeat |= SSL_TLSEXT_HB_DONT_SEND_REQUESTS;
2434                                                         break;
2435                                 default:        *al = SSL_AD_ILLEGAL_PARAMETER;
2436                                                         return 0;
2437                                 }
2438                         }
2439 #endif
2440 #ifndef OPENSSL_NO_NEXTPROTONEG
2441                 else if (type == TLSEXT_TYPE_next_proto_neg &&
2442                          s->s3->tmp.finish_md_len == 0 &&
2443                          s->s3->alpn_selected == NULL)
2444                         {
2445                         /*-
2446                          * We shouldn't accept this extension on a
2447                          * renegotiation.
2448                          *
2449                          * s->new_session will be set on renegotiation, but we
2450                          * probably shouldn't rely that it couldn't be set on
2451                          * the initial renegotation too in certain cases (when
2452                          * there's some other reason to disallow resuming an
2453                          * earlier session -- the current code won't be doing
2454                          * anything like that, but this might change).
2455                          *
2456                          * A valid sign that there's been a previous handshake
2457                          * in this connection is if s->s3->tmp.finish_md_len >
2458                          * 0.  (We are talking about a check that will happen
2459                          * in the Hello protocol round, well before a new
2460                          * Finished message could have been computed.)
2461                          */
2462                         s->s3->next_proto_neg_seen = 1;
2463                         }
2464 #endif
2465
2466                 else if (type == TLSEXT_TYPE_application_layer_protocol_negotiation &&
2467                          s->ctx->alpn_select_cb &&
2468                          s->s3->tmp.finish_md_len == 0)
2469                         {
2470                         if (tls1_alpn_handle_client_hello(s, data, size, al) != 0)
2471                                 return 0;
2472 #ifndef OPENSSL_NO_NEXTPROTONEG
2473                         /* ALPN takes precedence over NPN. */
2474                         s->s3->next_proto_neg_seen = 0;
2475 #endif
2476                         }
2477
2478                 /* session ticket processed earlier */
2479 #ifndef OPENSSL_NO_SRTP
2480                 else if (SSL_IS_DTLS(s) && SSL_get_srtp_profiles(s)
2481                                 && type == TLSEXT_TYPE_use_srtp)
2482                         {
2483                         if(ssl_parse_clienthello_use_srtp_ext(s, data, size,
2484                                                               al))
2485                                 return 0;
2486                         }
2487 #endif
2488 #ifdef TLSEXT_TYPE_encrypt_then_mac
2489                 else if (type == TLSEXT_TYPE_encrypt_then_mac)
2490                         s->s3->flags |= TLS1_FLAGS_ENCRYPT_THEN_MAC;
2491 #endif
2492                 /* If this ClientHello extension was unhandled and this is
2493                  * a nonresumed connection, check whether the extension is a
2494                  * custom TLS Extension (has a custom_srv_ext_record), and if
2495                  * so call the callback and record the extension number so that
2496                  * an appropriate ServerHello may be later returned.
2497                  */
2498                 else if (!s->hit)
2499                         {
2500                         if (custom_ext_parse(s, 1, type, data, size, al) <= 0)
2501                                 return 0;
2502                         }
2503
2504                 data+=size;
2505                 }
2506
2507         *p = data;
2508
2509         ri_check:
2510
2511         /* Need RI if renegotiating */
2512
2513         if (!renegotiate_seen && s->renegotiate &&
2514                 !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
2515                 {
2516                 *al = SSL_AD_HANDSHAKE_FAILURE;
2517                 SSLerr(SSL_F_SSL_SCAN_CLIENTHELLO_TLSEXT,
2518                                 SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
2519                 return 0;
2520                 }
2521
2522         return 1;
2523         }
2524
2525 int ssl_parse_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n)
2526         {
2527         int al = -1;
2528         custom_ext_init(&s->cert->srv_ext);
2529         if (ssl_scan_clienthello_tlsext(s, p, d, n, &al) <= 0)
2530                 {
2531                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2532                 return 0;
2533                 }
2534
2535         if (ssl_check_clienthello_tlsext_early(s) <= 0)
2536                 {
2537                 SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_TLSEXT,SSL_R_CLIENTHELLO_TLSEXT);
2538                 return 0;
2539                 }
2540         return 1;
2541 }
2542
2543 #ifndef OPENSSL_NO_NEXTPROTONEG
2544 /* ssl_next_proto_validate validates a Next Protocol Negotiation block. No
2545  * elements of zero length are allowed and the set of elements must exactly fill
2546  * the length of the block. */
2547 static char ssl_next_proto_validate(unsigned char *d, unsigned len)
2548         {
2549         unsigned int off = 0;
2550
2551         while (off < len)
2552                 {
2553                 if (d[off] == 0)
2554                         return 0;
2555                 off += d[off];
2556                 off++;
2557                 }
2558
2559         return off == len;
2560         }
2561 #endif
2562
2563 static int ssl_scan_serverhello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al)
2564         {
2565         unsigned short length;
2566         unsigned short type;
2567         unsigned short size;
2568         unsigned char *data = *p;
2569         int tlsext_servername = 0;
2570         int renegotiate_seen = 0;
2571
2572 #ifndef OPENSSL_NO_NEXTPROTONEG
2573         s->s3->next_proto_neg_seen = 0;
2574 #endif
2575         s->tlsext_ticket_expected = 0;
2576
2577         if (s->s3->alpn_selected)
2578                 {
2579                 OPENSSL_free(s->s3->alpn_selected);
2580                 s->s3->alpn_selected = NULL;
2581                 }
2582
2583 #ifndef OPENSSL_NO_HEARTBEATS
2584         s->tlsext_heartbeat &= ~(SSL_TLSEXT_HB_ENABLED |
2585                                SSL_TLSEXT_HB_DONT_SEND_REQUESTS);
2586 #endif
2587
2588 #ifdef TLSEXT_TYPE_encrypt_then_mac
2589         s->s3->flags &= ~TLS1_FLAGS_ENCRYPT_THEN_MAC;
2590 #endif
2591
2592         if (data >= (d+n-2))
2593                 goto ri_check;
2594
2595         n2s(data,length);
2596         if (data+length != d+n)
2597                 {
2598                 *al = SSL_AD_DECODE_ERROR;
2599                 return 0;
2600                 }
2601
2602         while(data <= (d+n-4))
2603                 {
2604                 n2s(data,type);
2605                 n2s(data,size);
2606
2607                 if (data+size > (d+n))
2608                         goto ri_check;
2609
2610                 if (s->tlsext_debug_cb)
2611                         s->tlsext_debug_cb(s, 1, type, data, size,
2612                                                 s->tlsext_debug_arg);
2613
2614
2615                 if (type == TLSEXT_TYPE_renegotiate)
2616                         {
2617                         if(!ssl_parse_serverhello_renegotiate_ext(s, data, size, al))
2618                                 return 0;
2619                         renegotiate_seen = 1;
2620                         }
2621                 else if (s->version == SSL3_VERSION)
2622                         {}
2623                 else if (type == TLSEXT_TYPE_server_name)
2624                         {
2625                         if (s->tlsext_hostname == NULL || size > 0)
2626                                 {
2627                                 *al = TLS1_AD_UNRECOGNIZED_NAME;
2628                                 return 0;
2629                                 }
2630                         tlsext_servername = 1;
2631                         }
2632
2633 #ifndef OPENSSL_NO_EC
2634                 else if (type == TLSEXT_TYPE_ec_point_formats)
2635                         {
2636                         unsigned char *sdata = data;
2637                         int ecpointformatlist_length = *(sdata++);
2638
2639                         if (ecpointformatlist_length != size - 1)
2640                                 {
2641                                 *al = TLS1_AD_DECODE_ERROR;
2642                                 return 0;
2643                                 }
2644                         if (!s->hit)
2645                                 {
2646                                 s->session->tlsext_ecpointformatlist_length = 0;
2647                                 if (s->session->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->session->tlsext_ecpointformatlist);
2648                                 if ((s->session->tlsext_ecpointformatlist = OPENSSL_malloc(ecpointformatlist_length)) == NULL)
2649                                         {
2650                                         *al = TLS1_AD_INTERNAL_ERROR;
2651                                         return 0;
2652                                         }
2653                                 s->session->tlsext_ecpointformatlist_length = ecpointformatlist_length;
2654                                 memcpy(s->session->tlsext_ecpointformatlist, sdata, ecpointformatlist_length);
2655                                 }
2656 #if 0
2657                         fprintf(stderr,"ssl_parse_serverhello_tlsext s->session->tlsext_ecpointformatlist ");
2658                         sdata = s->session->tlsext_ecpointformatlist;
2659                         for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
2660                                 fprintf(stderr,"%i ",*(sdata++));
2661                         fprintf(stderr,"\n");
2662 #endif
2663                         }
2664 #endif /* OPENSSL_NO_EC */
2665
2666                 else if (type == TLSEXT_TYPE_session_ticket)
2667                         {
2668                         if (s->tls_session_ticket_ext_cb &&
2669                             !s->tls_session_ticket_ext_cb(s, data, size, s->tls_session_ticket_ext_cb_arg))
2670                                 {
2671                                 *al = TLS1_AD_INTERNAL_ERROR;
2672                                 return 0;
2673                                 }
2674                         if (!tls_use_ticket(s) || (size > 0))
2675                                 {
2676                                 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
2677                                 return 0;
2678                                 }
2679                         s->tlsext_ticket_expected = 1;
2680                         }
2681 #ifdef TLSEXT_TYPE_opaque_prf_input
2682                 else if (type == TLSEXT_TYPE_opaque_prf_input)
2683                         {
2684                         unsigned char *sdata = data;
2685
2686                         if (size < 2)
2687                                 {
2688                                 *al = SSL_AD_DECODE_ERROR;
2689                                 return 0;
2690                                 }
2691                         n2s(sdata, s->s3->server_opaque_prf_input_len);
2692                         if (s->s3->server_opaque_prf_input_len != size - 2)
2693                                 {
2694                                 *al = SSL_AD_DECODE_ERROR;
2695                                 return 0;
2696                                 }
2697
2698                         if (s->s3->server_opaque_prf_input != NULL) /* shouldn't really happen */
2699                                 OPENSSL_free(s->s3->server_opaque_prf_input);
2700                         if (s->s3->server_opaque_prf_input_len == 0)
2701                                 s->s3->server_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
2702                         else
2703                                 s->s3->server_opaque_prf_input = BUF_memdup(sdata, s->s3->server_opaque_prf_input_len);
2704
2705                         if (s->s3->server_opaque_prf_input == NULL)
2706                                 {
2707                                 *al = TLS1_AD_INTERNAL_ERROR;
2708                                 return 0;
2709                                 }
2710                         }
2711 #endif
2712                 else if (type == TLSEXT_TYPE_status_request)
2713                         {
2714                         /* MUST be empty and only sent if we've requested
2715                          * a status request message.
2716                          */
2717                         if ((s->tlsext_status_type == -1) || (size > 0))
2718                                 {
2719                                 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
2720                                 return 0;
2721                                 }
2722                         /* Set flag to expect CertificateStatus message */
2723                         s->tlsext_status_expected = 1;
2724                         }
2725 #ifndef OPENSSL_NO_NEXTPROTONEG
2726                 else if (type == TLSEXT_TYPE_next_proto_neg &&
2727                          s->s3->tmp.finish_md_len == 0)
2728                         {
2729                         unsigned char *selected;
2730                         unsigned char selected_len;
2731
2732                         /* We must have requested it. */
2733                         if (s->ctx->next_proto_select_cb == NULL)
2734                                 {
2735                                 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
2736                                 return 0;
2737                                 }
2738                         /* The data must be valid */
2739                         if (!ssl_next_proto_validate(data, size))
2740                                 {
2741                                 *al = TLS1_AD_DECODE_ERROR;
2742                                 return 0;
2743                                 }
2744                         if (s->ctx->next_proto_select_cb(s, &selected, &selected_len, data, size, s->ctx->next_proto_select_cb_arg) != SSL_TLSEXT_ERR_OK)
2745                                 {
2746                                 *al = TLS1_AD_INTERNAL_ERROR;
2747                                 return 0;
2748                                 }
2749                         s->next_proto_negotiated = OPENSSL_malloc(selected_len);
2750                         if (!s->next_proto_negotiated)
2751                                 {
2752                                 *al = TLS1_AD_INTERNAL_ERROR;
2753                                 return 0;
2754                                 }
2755                         memcpy(s->next_proto_negotiated, selected, selected_len);
2756                         s->next_proto_negotiated_len = selected_len;
2757                         s->s3->next_proto_neg_seen = 1;
2758                         }
2759 #endif
2760
2761                 else if (type == TLSEXT_TYPE_application_layer_protocol_negotiation)
2762                         {
2763                         unsigned len;
2764
2765                         /* We must have requested it. */
2766                         if (s->alpn_client_proto_list == NULL)
2767                                 {
2768                                 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
2769                                 return 0;
2770                                 }
2771                         if (size < 4)
2772                                 {
2773                                 *al = TLS1_AD_DECODE_ERROR;
2774                                 return 0;
2775                                 }
2776                         /*-
2777                          * The extension data consists of:
2778                          *   uint16 list_length
2779                          *   uint8 proto_length;
2780                          *   uint8 proto[proto_length];
2781                          */
2782                         len = data[0];
2783                         len <<= 8;
2784                         len |= data[1];
2785                         if (len != (unsigned) size - 2)
2786                                 {
2787                                 *al = TLS1_AD_DECODE_ERROR;
2788                                 return 0;
2789                                 }
2790                         len = data[2];
2791                         if (len != (unsigned) size - 3)
2792                                 {
2793                                 *al = TLS1_AD_DECODE_ERROR;
2794                                 return 0;
2795                                 }
2796                         if (s->s3->alpn_selected)
2797                                 OPENSSL_free(s->s3->alpn_selected);
2798                         s->s3->alpn_selected = OPENSSL_malloc(len);
2799                         if (!s->s3->alpn_selected)
2800                                 {
2801                                 *al = TLS1_AD_INTERNAL_ERROR;
2802                                 return 0;
2803                                 }
2804                         memcpy(s->s3->alpn_selected, data + 3, len);
2805                         s->s3->alpn_selected_len = len;
2806                         }
2807 #ifndef OPENSSL_NO_HEARTBEATS
2808                 else if (type == TLSEXT_TYPE_heartbeat)
2809                         {
2810                         switch(data[0])
2811                                 {
2812                                 case 0x01:      /* Server allows us to send HB requests */
2813                                                         s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED;
2814                                                         break;
2815                                 case 0x02:      /* Server doesn't accept HB requests */
2816                                                         s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED;
2817                                                         s->tlsext_heartbeat |= SSL_TLSEXT_HB_DONT_SEND_REQUESTS;
2818                                                         break;
2819                                 default:        *al = SSL_AD_ILLEGAL_PARAMETER;
2820                                                         return 0;
2821                                 }
2822                         }
2823 #endif
2824 #ifndef OPENSSL_NO_SRTP
2825                 else if (SSL_IS_DTLS(s) && type == TLSEXT_TYPE_use_srtp)
2826                         {
2827                         if(ssl_parse_serverhello_use_srtp_ext(s, data, size,
2828                                                               al))
2829                                 return 0;
2830                         }
2831 #endif
2832 #ifdef TLSEXT_TYPE_encrypt_then_mac
2833                 else if (type == TLSEXT_TYPE_encrypt_then_mac)
2834                         {
2835                         /* Ignore if inappropriate ciphersuite */
2836                         if (s->s3->tmp.new_cipher->algorithm_mac != SSL_AEAD
2837                             && s->s3->tmp.new_cipher->algorithm_enc != SSL_RC4)
2838                                 s->s3->flags |= TLS1_FLAGS_ENCRYPT_THEN_MAC;
2839                         }
2840 #endif
2841                 /* If this extension type was not otherwise handled, but
2842                  * matches a custom_cli_ext_record, then send it to the c
2843                  * callback */
2844                 else if (custom_ext_parse(s, 0, type, data, size, al) <= 0)
2845                                 return 0;
2846
2847                 data += size;
2848                 }
2849
2850         if (data != d+n)
2851                 {
2852                 *al = SSL_AD_DECODE_ERROR;
2853                 return 0;
2854                 }
2855
2856         if (!s->hit && tlsext_servername == 1)
2857                 {
2858                 if (s->tlsext_hostname)
2859                         {
2860                         if (s->session->tlsext_hostname == NULL)
2861                                 {
2862                                 s->session->tlsext_hostname = BUF_strdup(s->tlsext_hostname);
2863                                 if (!s->session->tlsext_hostname)
2864                                         {
2865                                         *al = SSL_AD_UNRECOGNIZED_NAME;
2866                                         return 0;
2867                                         }
2868                                 }
2869                         else
2870                                 {
2871                                 *al = SSL_AD_DECODE_ERROR;
2872                                 return 0;
2873                                 }
2874                         }
2875                 }
2876
2877         *p = data;
2878
2879         ri_check:
2880
2881         /* Determine if we need to see RI. Strictly speaking if we want to
2882          * avoid an attack we should *always* see RI even on initial server
2883          * hello because the client doesn't see any renegotiation during an
2884          * attack. However this would mean we could not connect to any server
2885          * which doesn't support RI so for the immediate future tolerate RI
2886          * absence on initial connect only.
2887          */
2888         if (!renegotiate_seen
2889                 && !(s->options & SSL_OP_LEGACY_SERVER_CONNECT)
2890                 && !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
2891                 {
2892                 *al = SSL_AD_HANDSHAKE_FAILURE;
2893                 SSLerr(SSL_F_SSL_SCAN_SERVERHELLO_TLSEXT,
2894                                 SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
2895                 return 0;
2896                 }
2897
2898         return 1;
2899         }
2900
2901
2902 int ssl_prepare_clienthello_tlsext(SSL *s)
2903         {
2904
2905 #ifdef TLSEXT_TYPE_opaque_prf_input
2906         {
2907                 int r = 1;
2908
2909                 if (s->ctx->tlsext_opaque_prf_input_callback != 0)
2910                         {
2911                         r = s->ctx->tlsext_opaque_prf_input_callback(s, NULL, 0, s->ctx->tlsext_opaque_prf_input_callback_arg);
2912                         if (!r)
2913                                 return -1;
2914                         }
2915
2916                 if (s->tlsext_opaque_prf_input != NULL)
2917                         {
2918                         if (s->s3->client_opaque_prf_input != NULL) /* shouldn't really happen */
2919                                 OPENSSL_free(s->s3->client_opaque_prf_input);
2920
2921                         if (s->tlsext_opaque_prf_input_len == 0)
2922                                 s->s3->client_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
2923                         else
2924                                 s->s3->client_opaque_prf_input = BUF_memdup(s->tlsext_opaque_prf_input, s->tlsext_opaque_prf_input_len);
2925                         if (s->s3->client_opaque_prf_input == NULL)
2926                                 {
2927                                 SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
2928                                 return -1;
2929                                 }
2930                         s->s3->client_opaque_prf_input_len = s->tlsext_opaque_prf_input_len;
2931                         }
2932
2933                 if (r == 2)
2934                         /* at callback's request, insist on receiving an appropriate server opaque PRF input */
2935                         s->s3->server_opaque_prf_input_len = s->tlsext_opaque_prf_input_len;
2936         }
2937 #endif
2938
2939         return 1;
2940         }
2941
2942 int ssl_prepare_serverhello_tlsext(SSL *s)
2943         {
2944         return 1;
2945         }
2946
2947 static int ssl_check_clienthello_tlsext_early(SSL *s)
2948         {
2949         int ret=SSL_TLSEXT_ERR_NOACK;
2950         int al = SSL_AD_UNRECOGNIZED_NAME;
2951
2952 #ifndef OPENSSL_NO_EC
2953         /* The handling of the ECPointFormats extension is done elsewhere, namely in
2954          * ssl3_choose_cipher in s3_lib.c.
2955          */
2956         /* The handling of the EllipticCurves extension is done elsewhere, namely in
2957          * ssl3_choose_cipher in s3_lib.c.
2958          */
2959 #endif
2960
2961         if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0)
2962                 ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg);
2963         else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0)
2964                 ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg);
2965
2966 #ifdef TLSEXT_TYPE_opaque_prf_input
2967         {
2968                 /* This sort of belongs into ssl_prepare_serverhello_tlsext(),
2969                  * but we might be sending an alert in response to the client hello,
2970                  * so this has to happen here in
2971                  * ssl_check_clienthello_tlsext_early(). */
2972
2973                 int r = 1;
2974
2975                 if (s->ctx->tlsext_opaque_prf_input_callback != 0)
2976                         {
2977                         r = s->ctx->tlsext_opaque_prf_input_callback(s, NULL, 0, s->ctx->tlsext_opaque_prf_input_callback_arg);
2978                         if (!r)
2979                                 {
2980                                 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2981                                 al = SSL_AD_INTERNAL_ERROR;
2982                                 goto err;
2983                                 }
2984                         }
2985
2986                 if (s->s3->server_opaque_prf_input != NULL) /* shouldn't really happen */
2987                         OPENSSL_free(s->s3->server_opaque_prf_input);
2988                 s->s3->server_opaque_prf_input = NULL;
2989
2990                 if (s->tlsext_opaque_prf_input != NULL)
2991                         {
2992                         if (s->s3->client_opaque_prf_input != NULL &&
2993                                 s->s3->client_opaque_prf_input_len == s->tlsext_opaque_prf_input_len)
2994                                 {
2995                                 /* can only use this extension if we have a server opaque PRF input
2996                                  * of the same length as the client opaque PRF input! */
2997
2998                                 if (s->tlsext_opaque_prf_input_len == 0)
2999                                         s->s3->server_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
3000                                 else
3001                                         s->s3->server_opaque_prf_input = BUF_memdup(s->tlsext_opaque_prf_input, s->tlsext_opaque_prf_input_len);
3002                                 if (s->s3->server_opaque_prf_input == NULL)
3003                                         {
3004                                         ret = SSL_TLSEXT_ERR_ALERT_FATAL;
3005                                         al = SSL_AD_INTERNAL_ERROR;
3006                                         goto err;
3007                                         }
3008                                 s->s3->server_opaque_prf_input_len = s->tlsext_opaque_prf_input_len;
3009                                 }
3010                         }
3011
3012                 if (r == 2 && s->s3->server_opaque_prf_input == NULL)
3013                         {
3014                         /* The callback wants to enforce use of the extension,
3015                          * but we can't do that with the client opaque PRF input;
3016                          * abort the handshake.
3017                          */
3018                         ret = SSL_TLSEXT_ERR_ALERT_FATAL;
3019                         al = SSL_AD_HANDSHAKE_FAILURE;
3020                         }
3021         }
3022
3023  err:
3024 #endif
3025         switch (ret)
3026                 {
3027                 case SSL_TLSEXT_ERR_ALERT_FATAL:
3028                         ssl3_send_alert(s,SSL3_AL_FATAL,al);
3029                         return -1;
3030
3031                 case SSL_TLSEXT_ERR_ALERT_WARNING:
3032                         ssl3_send_alert(s,SSL3_AL_WARNING,al);
3033                         return 1;
3034
3035                 case SSL_TLSEXT_ERR_NOACK:
3036                         s->servername_done=0;
3037                         default:
3038                 return 1;
3039                 }
3040         }
3041
3042 int tls1_set_server_sigalgs(SSL *s)
3043         {
3044         int al;
3045         size_t i;
3046         /* Clear any shared sigtnature algorithms */
3047         if (s->cert->shared_sigalgs)
3048                 {
3049                 OPENSSL_free(s->cert->shared_sigalgs);
3050                 s->cert->shared_sigalgs = NULL;
3051                 }
3052         /* Clear certificate digests and validity flags */
3053         for (i = 0; i < SSL_PKEY_NUM; i++)
3054                 {
3055                 s->cert->pkeys[i].digest = NULL;
3056                 s->cert->pkeys[i].valid_flags = 0;
3057                 }
3058
3059         /* If sigalgs received process it. */
3060         if (s->cert->peer_sigalgs)
3061                 {
3062                 if (!tls1_process_sigalgs(s))
3063                         {
3064                         SSLerr(SSL_F_TLS1_SET_SERVER_SIGALGS,
3065                                         ERR_R_MALLOC_FAILURE);
3066                         al = SSL_AD_INTERNAL_ERROR;
3067                         goto err;
3068                         }
3069                 /* Fatal error is no shared signature algorithms */
3070                 if (!s->cert->shared_sigalgs)
3071                         {
3072                         SSLerr(SSL_F_TLS1_SET_SERVER_SIGALGS,
3073                                         SSL_R_NO_SHARED_SIGATURE_ALGORITHMS);
3074                         al = SSL_AD_ILLEGAL_PARAMETER;
3075                         goto err;
3076                         }
3077                 }
3078         else
3079                 ssl_cert_set_default_md(s->cert);
3080         return 1;
3081         err:
3082         ssl3_send_alert(s, SSL3_AL_FATAL, al);
3083         return 0;
3084         }
3085
3086 int ssl_check_clienthello_tlsext_late(SSL *s)
3087         {
3088         int ret = SSL_TLSEXT_ERR_OK;
3089         int al;
3090
3091         /* If status request then ask callback what to do.
3092          * Note: this must be called after servername callbacks in case
3093          * the certificate has changed, and must be called after the cipher
3094          * has been chosen because this may influence which certificate is sent
3095          */
3096         if ((s->tlsext_status_type != -1) && s->ctx && s->ctx->tlsext_status_cb)
3097                 {
3098                 int r;
3099                 CERT_PKEY *certpkey;
3100                 certpkey = ssl_get_server_send_pkey(s);
3101                 /* If no certificate can't return certificate status */
3102                 if (certpkey == NULL)
3103                         {
3104                         s->tlsext_status_expected = 0;
3105                         return 1;
3106                         }
3107                 /* Set current certificate to one we will use so
3108                  * SSL_get_certificate et al can pick it up.
3109                  */
3110                 s->cert->key = certpkey;
3111                 r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
3112                 switch (r)
3113                         {
3114                         /* We don't want to send a status request response */
3115                         case SSL_TLSEXT_ERR_NOACK:
3116                                 s->tlsext_status_expected = 0;
3117                                 break;
3118                         /* status request response should be sent */
3119                         case SSL_TLSEXT_ERR_OK:
3120                                 if (s->tlsext_ocsp_resp)
3121                                         s->tlsext_status_expected = 1;
3122                                 else
3123                                         s->tlsext_status_expected = 0;
3124                                 break;
3125                         /* something bad happened */
3126                         case SSL_TLSEXT_ERR_ALERT_FATAL:
3127                                 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
3128                                 al = SSL_AD_INTERNAL_ERROR;
3129                                 goto err;
3130                         }
3131                 }
3132         else
3133                 s->tlsext_status_expected = 0;
3134
3135  err:
3136         switch (ret)
3137                 {
3138                 case SSL_TLSEXT_ERR_ALERT_FATAL:
3139                         ssl3_send_alert(s, SSL3_AL_FATAL, al);
3140                         return -1;
3141
3142                 case SSL_TLSEXT_ERR_ALERT_WARNING:
3143                         ssl3_send_alert(s, SSL3_AL_WARNING, al);
3144                         return 1;
3145
3146                 default:
3147                         return 1;
3148                 }
3149         }
3150
3151 int ssl_check_serverhello_tlsext(SSL *s)
3152         {
3153         int ret=SSL_TLSEXT_ERR_NOACK;
3154         int al = SSL_AD_UNRECOGNIZED_NAME;
3155
3156 #ifndef OPENSSL_NO_EC
3157         /* If we are client and using an elliptic curve cryptography cipher
3158          * suite, then if server returns an EC point formats lists extension
3159          * it must contain uncompressed.
3160          */
3161         unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
3162         unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth;
3163         if ((s->tlsext_ecpointformatlist != NULL) && (s->tlsext_ecpointformatlist_length > 0) &&
3164             (s->session->tlsext_ecpointformatlist != NULL) && (s->session->tlsext_ecpointformatlist_length > 0) &&
3165             ((alg_k & (SSL_kECDHE|SSL_kECDHr|SSL_kECDHe)) || (alg_a & SSL_aECDSA)))
3166                 {
3167                 /* we are using an ECC cipher */
3168                 size_t i;
3169                 unsigned char *list;
3170                 int found_uncompressed = 0;
3171                 list = s->session->tlsext_ecpointformatlist;
3172                 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
3173                         {
3174                         if (*(list++) == TLSEXT_ECPOINTFORMAT_uncompressed)
3175                                 {
3176                                 found_uncompressed = 1;
3177                                 break;
3178                                 }
3179                         }
3180                 if (!found_uncompressed)
3181                         {
3182                         SSLerr(SSL_F_SSL_CHECK_SERVERHELLO_TLSEXT,SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST);
3183                         return -1;
3184                         }
3185                 }
3186         ret = SSL_TLSEXT_ERR_OK;
3187 #endif /* OPENSSL_NO_EC */
3188
3189         if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0)
3190                 ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg);
3191         else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0)
3192                 ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg);
3193
3194 #ifdef TLSEXT_TYPE_opaque_prf_input
3195         if (s->s3->server_opaque_prf_input_len > 0)
3196                 {
3197                 /* This case may indicate that we, as a client, want to insist on using opaque PRF inputs.
3198                  * So first verify that we really have a value from the server too. */
3199
3200                 if (s->s3->server_opaque_prf_input == NULL)
3201                         {
3202                         ret = SSL_TLSEXT_ERR_ALERT_FATAL;
3203                         al = SSL_AD_HANDSHAKE_FAILURE;
3204                         }
3205
3206                 /* Anytime the server *has* sent an opaque PRF input, we need to check
3207                  * that we have a client opaque PRF input of the same size. */
3208                 if (s->s3->client_opaque_prf_input == NULL ||
3209                     s->s3->client_opaque_prf_input_len != s->s3->server_opaque_prf_input_len)
3210                         {
3211                         ret = SSL_TLSEXT_ERR_ALERT_FATAL;
3212                         al = SSL_AD_ILLEGAL_PARAMETER;
3213                         }
3214                 }
3215 #endif
3216
3217         /* If we've requested certificate status and we wont get one
3218          * tell the callback
3219          */
3220         if ((s->tlsext_status_type != -1) && !(s->tlsext_status_expected)
3221                         && s->ctx && s->ctx->tlsext_status_cb)
3222                 {
3223                 int r;
3224                 /* Set resp to NULL, resplen to -1 so callback knows
3225                  * there is no response.
3226                  */
3227                 if (s->tlsext_ocsp_resp)
3228                         {
3229                         OPENSSL_free(s->tlsext_ocsp_resp);
3230                         s->tlsext_ocsp_resp = NULL;
3231                         }
3232                 s->tlsext_ocsp_resplen = -1;
3233                 r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
3234                 if (r == 0)
3235                         {
3236                         al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
3237                         ret = SSL_TLSEXT_ERR_ALERT_FATAL;
3238                         }
3239                 if (r < 0)
3240                         {
3241                         al = SSL_AD_INTERNAL_ERROR;
3242                         ret = SSL_TLSEXT_ERR_ALERT_FATAL;
3243                         }
3244                 }
3245
3246         switch (ret)
3247                 {
3248                 case SSL_TLSEXT_ERR_ALERT_FATAL:
3249                         ssl3_send_alert(s,SSL3_AL_FATAL,al);
3250                         return -1;
3251
3252                 case SSL_TLSEXT_ERR_ALERT_WARNING:
3253                         ssl3_send_alert(s,SSL3_AL_WARNING,al);
3254                         return 1;
3255
3256                 case SSL_TLSEXT_ERR_NOACK:
3257                         s->servername_done=0;
3258                         default:
3259                 return 1;
3260                 }
3261         }
3262
3263 int ssl_parse_serverhello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n)
3264         {
3265         int al = -1;
3266         if (s->version < SSL3_VERSION)
3267                 return 1;
3268         if (ssl_scan_serverhello_tlsext(s, p, d, n, &al) <= 0)
3269                 {
3270                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
3271                 return 0;
3272                 }
3273
3274         if (ssl_check_serverhello_tlsext(s) <= 0)
3275                 {
3276                 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_TLSEXT,SSL_R_SERVERHELLO_TLSEXT);
3277                 return 0;
3278                 }
3279         return 1;
3280 }
3281
3282 /*-
3283  * Since the server cache lookup is done early on in the processing of the
3284  * ClientHello, and other operations depend on the result, we need to handle
3285  * any TLS session ticket extension at the same time.
3286  *
3287  *   session_id: points at the session ID in the ClientHello. This code will
3288  *       read past the end of this in order to parse out the session ticket
3289  *       extension, if any.
3290  *   len: the length of the session ID.
3291  *   limit: a pointer to the first byte after the ClientHello.
3292  *   ret: (output) on return, if a ticket was decrypted, then this is set to
3293  *       point to the resulting session.
3294  *
3295  * If s->tls_session_secret_cb is set then we are expecting a pre-shared key
3296  * ciphersuite, in which case we have no use for session tickets and one will
3297  * never be decrypted, nor will s->tlsext_ticket_expected be set to 1.
3298  *
3299  * Returns:
3300  *   -1: fatal error, either from parsing or decrypting the ticket.
3301  *    0: no ticket was found (or was ignored, based on settings).
3302  *    1: a zero length extension was found, indicating that the client supports
3303  *       session tickets but doesn't currently have one to offer.
3304  *    2: either s->tls_session_secret_cb was set, or a ticket was offered but
3305  *       couldn't be decrypted because of a non-fatal error.
3306  *    3: a ticket was successfully decrypted and *ret was set.
3307  *
3308  * Side effects:
3309  *   Sets s->tlsext_ticket_expected to 1 if the server will have to issue
3310  *   a new session ticket to the client because the client indicated support
3311  *   (and s->tls_session_secret_cb is NULL) but the client either doesn't have
3312  *   a session ticket or we couldn't use the one it gave us, or if
3313  *   s->ctx->tlsext_ticket_key_cb asked to renew the client's ticket.
3314  *   Otherwise, s->tlsext_ticket_expected is set to 0.
3315  */
3316 int tls1_process_ticket(SSL *s, unsigned char *session_id, int len,
3317                         const unsigned char *limit, SSL_SESSION **ret)
3318         {
3319         /* Point after session ID in client hello */
3320         const unsigned char *p = session_id + len;
3321         unsigned short i;
3322
3323         *ret = NULL;
3324         s->tlsext_ticket_expected = 0;
3325
3326         /* If tickets disabled behave as if no ticket present
3327          * to permit stateful resumption.
3328          */
3329         if (!tls_use_ticket(s))
3330                 return 0;
3331         if ((s->version <= SSL3_VERSION) || !limit)
3332                 return 0;
3333         if (p >= limit)
3334                 return -1;
3335         /* Skip past DTLS cookie */
3336         if (SSL_IS_DTLS(s))
3337                 {
3338                 i = *(p++);
3339                 p+= i;
3340                 if (p >= limit)
3341                         return -1;
3342                 }
3343         /* Skip past cipher list */
3344         n2s(p, i);
3345         p+= i;
3346         if (p >= limit)
3347                 return -1;
3348         /* Skip past compression algorithm list */
3349         i = *(p++);
3350         p += i;
3351         if (p > limit)
3352                 return -1;
3353         /* Now at start of extensions */
3354         if ((p + 2) >= limit)
3355                 return 0;
3356         n2s(p, i);
3357         while ((p + 4) <= limit)
3358                 {
3359                 unsigned short type, size;
3360                 n2s(p, type);
3361                 n2s(p, size);
3362                 if (p + size > limit)
3363                         return 0;
3364                 if (type == TLSEXT_TYPE_session_ticket)
3365                         {
3366                         int r;
3367                         if (size == 0)
3368                                 {
3369                                 /* The client will accept a ticket but doesn't
3370                                  * currently have one. */
3371                                 s->tlsext_ticket_expected = 1;
3372                                 return 1;
3373                                 }
3374                         if (s->tls_session_secret_cb)
3375                                 {
3376                                 /* Indicate that the ticket couldn't be
3377                                  * decrypted rather than generating the session
3378                                  * from ticket now, trigger abbreviated
3379                                  * handshake based on external mechanism to
3380                                  * calculate the master secret later. */
3381                                 return 2;
3382                                 }
3383                         r = tls_decrypt_ticket(s, p, size, session_id, len, ret);
3384                         switch (r)
3385                                 {
3386                                 case 2: /* ticket couldn't be decrypted */
3387                                         s->tlsext_ticket_expected = 1;
3388                                         return 2;
3389                                 case 3: /* ticket was decrypted */
3390                                         return r;
3391                                 case 4: /* ticket decrypted but need to renew */
3392                                         s->tlsext_ticket_expected = 1;
3393                                         return 3;
3394                                 default: /* fatal error */
3395                                         return -1;
3396                                 }
3397                         }
3398                 p += size;
3399                 }
3400         return 0;
3401         }
3402
3403 /*-
3404  * tls_decrypt_ticket attempts to decrypt a session ticket.
3405  *
3406  *   etick: points to the body of the session ticket extension.
3407  *   eticklen: the length of the session tickets extenion.
3408  *   sess_id: points at the session ID.
3409  *   sesslen: the length of the session ID.
3410  *   psess: (output) on return, if a ticket was decrypted, then this is set to
3411  *       point to the resulting session.
3412  *
3413  * Returns:
3414  *   -1: fatal error, either from parsing or decrypting the ticket.
3415  *    2: the ticket couldn't be decrypted.
3416  *    3: a ticket was successfully decrypted and *psess was set.
3417  *    4: same as 3, but the ticket needs to be renewed.
3418  */
3419 static int tls_decrypt_ticket(SSL *s, const unsigned char *etick, int eticklen,
3420                                 const unsigned char *sess_id, int sesslen,
3421                                 SSL_SESSION **psess)
3422         {
3423         SSL_SESSION *sess;
3424         unsigned char *sdec;
3425         const unsigned char *p;
3426         int slen, mlen, renew_ticket = 0;
3427         unsigned char tick_hmac[EVP_MAX_MD_SIZE];
3428         HMAC_CTX hctx;
3429         EVP_CIPHER_CTX ctx;
3430         SSL_CTX *tctx = s->initial_ctx;
3431         /* Need at least keyname + iv + some encrypted data */
3432         if (eticklen < 48)
3433                 return 2;
3434         /* Initialize session ticket encryption and HMAC contexts */
3435         HMAC_CTX_init(&hctx);
3436         EVP_CIPHER_CTX_init(&ctx);
3437         if (tctx->tlsext_ticket_key_cb)
3438                 {
3439                 unsigned char *nctick = (unsigned char *)etick;
3440                 int rv = tctx->tlsext_ticket_key_cb(s, nctick, nctick + 16,
3441                                                         &ctx, &hctx, 0);
3442                 if (rv < 0)
3443                         return -1;
3444                 if (rv == 0)
3445                         return 2;
3446                 if (rv == 2)
3447                         renew_ticket = 1;
3448                 }
3449         else
3450                 {
3451                 /* Check key name matches */
3452                 if (memcmp(etick, tctx->tlsext_tick_key_name, 16))
3453                         return 2;
3454                 HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
3455                                         tlsext_tick_md(), NULL);
3456                 EVP_DecryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
3457                                 tctx->tlsext_tick_aes_key, etick + 16);
3458                 }
3459         /* Attempt to process session ticket, first conduct sanity and
3460          * integrity checks on ticket.
3461          */
3462         mlen = HMAC_size(&hctx);
3463         if (mlen < 0)
3464                 {
3465                 EVP_CIPHER_CTX_cleanup(&ctx);
3466                 return -1;
3467                 }
3468         eticklen -= mlen;
3469         /* Check HMAC of encrypted ticket */
3470         HMAC_Update(&hctx, etick, eticklen);
3471         HMAC_Final(&hctx, tick_hmac, NULL);
3472         HMAC_CTX_cleanup(&hctx);
3473         if (CRYPTO_memcmp(tick_hmac, etick + eticklen, mlen))
3474                 {
3475                 EVP_CIPHER_CTX_cleanup(&ctx);
3476                 return 2;
3477                 }
3478         /* Attempt to decrypt session data */
3479         /* Move p after IV to start of encrypted ticket, update length */
3480         p = etick + 16 + EVP_CIPHER_CTX_iv_length(&ctx);
3481         eticklen -= 16 + EVP_CIPHER_CTX_iv_length(&ctx);
3482         sdec = OPENSSL_malloc(eticklen);
3483         if (!sdec)
3484                 {
3485                 EVP_CIPHER_CTX_cleanup(&ctx);
3486                 return -1;
3487                 }
3488         EVP_DecryptUpdate(&ctx, sdec, &slen, p, eticklen);
3489         if (EVP_DecryptFinal(&ctx, sdec + slen, &mlen) <= 0)
3490                 {
3491                 EVP_CIPHER_CTX_cleanup(&ctx);
3492                 OPENSSL_free(sdec);
3493                 return 2;
3494                 }
3495         slen += mlen;
3496         EVP_CIPHER_CTX_cleanup(&ctx);
3497         p = sdec;
3498
3499         sess = d2i_SSL_SESSION(NULL, &p, slen);
3500         OPENSSL_free(sdec);
3501         if (sess)
3502                 {
3503                 /* The session ID, if non-empty, is used by some clients to
3504                  * detect that the ticket has been accepted. So we copy it to
3505                  * the session structure. If it is empty set length to zero
3506                  * as required by standard.
3507                  */
3508                 if (sesslen)
3509                         memcpy(sess->session_id, sess_id, sesslen);
3510                 sess->session_id_length = sesslen;
3511                 *psess = sess;
3512                 if (renew_ticket)
3513                         return 4;
3514                 else
3515                         return 3;
3516                 }
3517         ERR_clear_error();
3518         /* For session parse failure, indicate that we need to send a new
3519          * ticket. */
3520         return 2;
3521         }
3522
3523 /* Tables to translate from NIDs to TLS v1.2 ids */
3524
3525 typedef struct
3526         {
3527         int nid;
3528         int id;
3529         } tls12_lookup;
3530
3531 static const tls12_lookup tls12_md[] = {
3532         {NID_md5, TLSEXT_hash_md5},
3533         {NID_sha1, TLSEXT_hash_sha1},
3534         {NID_sha224, TLSEXT_hash_sha224},
3535         {NID_sha256, TLSEXT_hash_sha256},
3536         {NID_sha384, TLSEXT_hash_sha384},
3537         {NID_sha512, TLSEXT_hash_sha512}
3538 };
3539
3540 static const tls12_lookup tls12_sig[] = {
3541         {EVP_PKEY_RSA, TLSEXT_signature_rsa},
3542         {EVP_PKEY_DSA, TLSEXT_signature_dsa},
3543         {EVP_PKEY_EC, TLSEXT_signature_ecdsa}
3544 };
3545
3546 static int tls12_find_id(int nid, const tls12_lookup *table, size_t tlen)
3547         {
3548         size_t i;
3549         for (i = 0; i < tlen; i++)
3550                 {
3551                 if (table[i].nid == nid)
3552                         return table[i].id;
3553                 }
3554         return -1;
3555         }
3556
3557 static int tls12_find_nid(int id, const tls12_lookup *table, size_t tlen)
3558         {
3559         size_t i;
3560         for (i = 0; i < tlen; i++)
3561                 {
3562                 if ((table[i].id) == id)
3563                         return table[i].nid;
3564                 }
3565         return NID_undef;
3566         }
3567
3568 int tls12_get_sigandhash(unsigned char *p, const EVP_PKEY *pk, const EVP_MD *md)
3569         {
3570         int sig_id, md_id;
3571         if (!md)
3572                 return 0;
3573         md_id = tls12_find_id(EVP_MD_type(md), tls12_md,
3574                                 sizeof(tls12_md)/sizeof(tls12_lookup));
3575         if (md_id == -1)
3576                 return 0;
3577         sig_id = tls12_get_sigid(pk);
3578         if (sig_id == -1)
3579                 return 0;
3580         p[0] = (unsigned char)md_id;
3581         p[1] = (unsigned char)sig_id;
3582         return 1;
3583         }
3584
3585 int tls12_get_sigid(const EVP_PKEY *pk)
3586         {
3587         return tls12_find_id(pk->type, tls12_sig,
3588                                 sizeof(tls12_sig)/sizeof(tls12_lookup));
3589         }
3590
3591 typedef struct
3592         {
3593         int nid;
3594         int secbits;
3595         const EVP_MD *(*mfunc)(void);
3596         } tls12_hash_info;
3597
3598 static const tls12_hash_info tls12_md_info[] = {
3599 #ifdef OPENSSL_NO_MD5
3600         {NID_md5, 64, 0},
3601 #else
3602         {NID_md5, 64, EVP_md5},
3603 #endif
3604 #ifdef OPENSSL_NO_SHA
3605         {NID_sha1, 80, 0},
3606 #else
3607         {NID_sha1, 80, EVP_sha1},
3608 #endif
3609 #ifdef OPENSSL_NO_SHA256
3610         {NID_sha224, 112, 0},
3611         {NID_sha256, 128, 0},
3612 #else
3613         {NID_sha224, 112, EVP_sha224},
3614         {NID_sha256, 128, EVP_sha256},
3615 #endif
3616 #ifdef OPENSSL_NO_SHA512
3617         {NID_sha384, 192, 0},
3618         {NID_sha512, 256, 0}
3619 #else
3620         {NID_sha384, 192, EVP_sha384},
3621         {NID_sha512, 256, EVP_sha512}
3622 #endif
3623 };
3624
3625 static const tls12_hash_info *tls12_get_hash_info(unsigned char hash_alg)
3626         {
3627         if (hash_alg == 0)
3628                 return NULL;
3629         if (hash_alg > sizeof(tls12_md_info)/sizeof(tls12_md_info[0]))
3630                 return NULL;
3631         return tls12_md_info + hash_alg - 1;
3632         }
3633
3634 const EVP_MD *tls12_get_hash(unsigned char hash_alg)
3635         {
3636         const tls12_hash_info *inf;
3637         if (hash_alg == TLSEXT_hash_md5 && FIPS_mode())
3638                 return NULL;
3639         inf = tls12_get_hash_info(hash_alg);
3640         if (!inf || !inf->mfunc)
3641                 return NULL;
3642         return inf->mfunc();
3643         }
3644
3645 static int tls12_get_pkey_idx(unsigned char sig_alg)
3646         {
3647         switch(sig_alg)
3648                 {
3649 #ifndef OPENSSL_NO_RSA
3650         case TLSEXT_signature_rsa:
3651                 return SSL_PKEY_RSA_SIGN;
3652 #endif
3653 #ifndef OPENSSL_NO_DSA
3654         case TLSEXT_signature_dsa:
3655                 return SSL_PKEY_DSA_SIGN;
3656 #endif
3657 #ifndef OPENSSL_NO_ECDSA
3658         case TLSEXT_signature_ecdsa:
3659                 return SSL_PKEY_ECC;
3660 #endif
3661                 }
3662         return -1;
3663         }
3664
3665 /* Convert TLS 1.2 signature algorithm extension values into NIDs */
3666 static void tls1_lookup_sigalg(int *phash_nid, int *psign_nid,
3667                         int *psignhash_nid, const unsigned char *data)
3668         {
3669         int sign_nid = 0, hash_nid = 0;
3670         if (!phash_nid && !psign_nid && !psignhash_nid)
3671                 return;
3672         if (phash_nid || psignhash_nid)
3673                 {
3674                 hash_nid = tls12_find_nid(data[0], tls12_md,
3675                                         sizeof(tls12_md)/sizeof(tls12_lookup));
3676                 if (phash_nid)
3677                         *phash_nid = hash_nid;
3678                 }
3679         if (psign_nid || psignhash_nid)
3680                 {
3681                 sign_nid = tls12_find_nid(data[1], tls12_sig,
3682                                         sizeof(tls12_sig)/sizeof(tls12_lookup));
3683                 if (psign_nid)
3684                         *psign_nid = sign_nid;
3685                 }
3686         if (psignhash_nid)
3687                 {
3688                 if (sign_nid && hash_nid)
3689                         OBJ_find_sigid_by_algs(psignhash_nid,
3690                                                         hash_nid, sign_nid);
3691                 else
3692                         *psignhash_nid = NID_undef;
3693                 }
3694         }
3695 /* Check to see if a signature algorithm is allowed */
3696 static int tls12_sigalg_allowed(SSL *s, int op, const unsigned char *ptmp)
3697         {
3698         /* See if we have an entry in the hash table and it is enabled */
3699         const tls12_hash_info *hinf = tls12_get_hash_info(ptmp[0]);
3700         if (!hinf || !hinf->mfunc)
3701                 return 0;
3702         /* See if public key algorithm allowed */
3703         if (tls12_get_pkey_idx(ptmp[1]) == -1)
3704                 return 0;
3705         /* Finally see if security callback allows it */
3706         return ssl_security(s, op, hinf->secbits, hinf->nid, (void *)ptmp);
3707         }
3708
3709 /* Get a mask of disabled public key algorithms based on supported
3710  * signature algorithms. For example if no signature algorithm supports RSA
3711  * then RSA is disabled.
3712  */
3713
3714 void ssl_set_sig_mask(unsigned long *pmask_a, SSL *s, int op)
3715         {
3716         const unsigned char *sigalgs;
3717         size_t i, sigalgslen;
3718         int have_rsa = 0, have_dsa = 0, have_ecdsa = 0;
3719         /* Now go through all signature algorithms seeing if we support
3720          * any for RSA, DSA, ECDSA. Do this for all versions not just
3721          * TLS 1.2. To keep down calls to security callback only check
3722          * if we have to.
3723          */
3724         sigalgslen = tls12_get_psigalgs(s, &sigalgs);
3725         for (i = 0; i < sigalgslen; i += 2, sigalgs += 2)
3726                 {
3727                 switch(sigalgs[1])
3728                         {
3729 #ifndef OPENSSL_NO_RSA
3730                 case TLSEXT_signature_rsa:
3731                         if (!have_rsa && tls12_sigalg_allowed(s, op, sigalgs))
3732                                 have_rsa = 1;
3733                         break;
3734 #endif
3735 #ifndef OPENSSL_NO_DSA
3736                 case TLSEXT_signature_dsa:
3737                         if (!have_dsa && tls12_sigalg_allowed(s, op, sigalgs))
3738                                 have_dsa = 1;
3739                         break;
3740 #endif
3741 #ifndef OPENSSL_NO_ECDSA
3742                 case TLSEXT_signature_ecdsa:
3743                         if (!have_ecdsa && tls12_sigalg_allowed(s, op, sigalgs))
3744                                 have_ecdsa = 1;
3745                         break;
3746 #endif
3747                         }
3748                 }
3749         if (!have_rsa)
3750                 *pmask_a |= SSL_aRSA;
3751         if (!have_dsa)
3752                 *pmask_a |= SSL_aDSS;
3753         if (!have_ecdsa)
3754                 *pmask_a |= SSL_aECDSA;
3755         }
3756
3757 size_t tls12_copy_sigalgs(SSL *s, unsigned char *out,
3758                                 const unsigned char *psig, size_t psiglen)
3759         {
3760         unsigned char *tmpout = out;
3761         size_t i;
3762         for (i = 0; i < psiglen; i += 2, psig += 2)
3763                 {
3764                 if (tls12_sigalg_allowed(s, SSL_SECOP_SIGALG_SUPPORTED, psig))
3765                         {
3766                         *tmpout++ = psig[0];
3767                         *tmpout++ = psig[1];
3768                         }
3769                 }
3770         return tmpout - out;
3771         }
3772
3773 /* Given preference and allowed sigalgs set shared sigalgs */
3774 static int tls12_shared_sigalgs(SSL *s, TLS_SIGALGS *shsig,
3775                                 const unsigned char *pref, size_t preflen,
3776                                 const unsigned char *allow, size_t allowlen)
3777         {
3778         const unsigned char *ptmp, *atmp;
3779         size_t i, j, nmatch = 0;
3780         for (i = 0, ptmp = pref; i < preflen; i+=2, ptmp+=2)
3781                 {
3782                 /* Skip disabled hashes or signature algorithms */
3783                 if (!tls12_sigalg_allowed(s, SSL_SECOP_SIGALG_SHARED, ptmp))
3784                         continue;
3785                 for (j = 0, atmp = allow; j < allowlen; j+=2, atmp+=2)
3786                         {
3787                         if (ptmp[0] == atmp[0] && ptmp[1] == atmp[1])
3788                                 {
3789                                 nmatch++;
3790                                 if (shsig)
3791                                         {
3792                                         shsig->rhash = ptmp[0];
3793                                         shsig->rsign = ptmp[1];
3794                                         tls1_lookup_sigalg(&shsig->hash_nid,
3795                                                 &shsig->sign_nid,
3796                                                 &shsig->signandhash_nid,
3797                                                 ptmp);
3798                                         shsig++;
3799                                         }
3800                                 break;
3801                                 }
3802                         }
3803                 }
3804         return nmatch;
3805         }
3806
3807 /* Set shared signature algorithms for SSL structures */
3808 static int tls1_set_shared_sigalgs(SSL *s)
3809         {
3810         const unsigned char *pref, *allow, *conf;
3811         size_t preflen, allowlen, conflen;
3812         size_t nmatch;
3813         TLS_SIGALGS *salgs = NULL;
3814         CERT *c = s->cert;
3815         unsigned int is_suiteb = tls1_suiteb(s);
3816         if (c->shared_sigalgs)
3817                 {
3818                 OPENSSL_free(c->shared_sigalgs);
3819                 c->shared_sigalgs = NULL;
3820                 }
3821         /* If client use client signature algorithms if not NULL */
3822         if (!s->server && c->client_sigalgs && !is_suiteb)
3823                 {
3824                 conf = c->client_sigalgs;
3825                 conflen = c->client_sigalgslen;
3826                 }
3827         else if (c->conf_sigalgs && !is_suiteb)
3828                 {
3829                 conf = c->conf_sigalgs;
3830                 conflen = c->conf_sigalgslen;
3831                 }
3832         else
3833                 conflen = tls12_get_psigalgs(s, &conf);
3834         if(s->options & SSL_OP_CIPHER_SERVER_PREFERENCE || is_suiteb)
3835                 {
3836                 pref = conf;
3837                 preflen = conflen;
3838                 allow = c->peer_sigalgs;
3839                 allowlen = c->peer_sigalgslen;
3840                 }
3841         else
3842                 {
3843                 allow = conf;
3844                 allowlen = conflen;
3845                 pref = c->peer_sigalgs;
3846                 preflen = c->peer_sigalgslen;
3847                 }
3848         nmatch = tls12_shared_sigalgs(s, NULL, pref, preflen, allow, allowlen);
3849         if (!nmatch)
3850                 return 1;
3851         salgs = OPENSSL_malloc(nmatch * sizeof(TLS_SIGALGS));
3852         if (!salgs)
3853                 return 0;
3854         nmatch = tls12_shared_sigalgs(s, salgs, pref, preflen, allow, allowlen);
3855         c->shared_sigalgs = salgs;
3856         c->shared_sigalgslen = nmatch;
3857         return 1;
3858         }
3859
3860
3861 /* Set preferred digest for each key type */
3862
3863 int tls1_save_sigalgs(SSL *s, const unsigned char *data, int dsize)
3864         {
3865         CERT *c = s->cert;
3866         /* Extension ignored for inappropriate versions */
3867         if (!SSL_USE_SIGALGS(s))
3868                 return 1;
3869         /* Should never happen */
3870         if (!c)
3871                 return 0;
3872
3873         if (c->peer_sigalgs)
3874                 OPENSSL_free(c->peer_sigalgs);
3875         c->peer_sigalgs = OPENSSL_malloc(dsize);
3876         if (!c->peer_sigalgs)
3877                 return 0;
3878         c->peer_sigalgslen = dsize;
3879         memcpy(c->peer_sigalgs, data, dsize);
3880         return 1;
3881         }
3882
3883 int tls1_process_sigalgs(SSL *s)
3884         {
3885         int idx;
3886         size_t i;
3887         const EVP_MD *md;
3888         CERT *c = s->cert;
3889         TLS_SIGALGS *sigptr;
3890         if (!tls1_set_shared_sigalgs(s))
3891                 return 0;
3892
3893 #ifdef OPENSSL_SSL_DEBUG_BROKEN_PROTOCOL
3894         if (s->cert->cert_flags & SSL_CERT_FLAG_BROKEN_PROTOCOL)
3895                 {
3896                 /* Use first set signature preference to force message
3897                  * digest, ignoring any peer preferences.
3898                  */
3899                 const unsigned char *sigs = NULL;
3900                 if (s->server)
3901                         sigs = c->conf_sigalgs;
3902                 else
3903                         sigs = c->client_sigalgs;
3904                 if (sigs)
3905                         {
3906                         idx = tls12_get_pkey_idx(sigs[1]);
3907                         md = tls12_get_hash(sigs[0]);
3908                         c->pkeys[idx].digest = md;
3909                         c->pkeys[idx].valid_flags = CERT_PKEY_EXPLICIT_SIGN;
3910                         if (idx == SSL_PKEY_RSA_SIGN)
3911                                 {
3912                                 c->pkeys[SSL_PKEY_RSA_ENC].valid_flags = CERT_PKEY_EXPLICIT_SIGN;
3913                                 c->pkeys[SSL_PKEY_RSA_ENC].digest = md;
3914                                 }
3915                         }
3916                 }
3917 #endif
3918
3919         for (i = 0, sigptr = c->shared_sigalgs;
3920                         i < c->shared_sigalgslen; i++, sigptr++)
3921                 {
3922                 idx = tls12_get_pkey_idx(sigptr->rsign);
3923                 if (idx > 0 && c->pkeys[idx].digest == NULL)
3924                         {
3925                         md = tls12_get_hash(sigptr->rhash);
3926                         c->pkeys[idx].digest = md;
3927                         c->pkeys[idx].valid_flags = CERT_PKEY_EXPLICIT_SIGN;
3928                         if (idx == SSL_PKEY_RSA_SIGN)
3929                                 {
3930                                 c->pkeys[SSL_PKEY_RSA_ENC].valid_flags = CERT_PKEY_EXPLICIT_SIGN;
3931                                 c->pkeys[SSL_PKEY_RSA_ENC].digest = md;
3932                                 }
3933                         }
3934
3935                 }
3936         /* In strict mode leave unset digests as NULL to indicate we can't
3937          * use the certificate for signing.
3938          */
3939         if (!(s->cert->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT))
3940                 {
3941                 /* Set any remaining keys to default values. NOTE: if alg is
3942                  * not supported it stays as NULL.
3943                  */
3944 #ifndef OPENSSL_NO_DSA
3945                 if (!c->pkeys[SSL_PKEY_DSA_SIGN].digest)
3946                         c->pkeys[SSL_PKEY_DSA_SIGN].digest = EVP_sha1();
3947 #endif
3948 #ifndef OPENSSL_NO_RSA
3949                 if (!c->pkeys[SSL_PKEY_RSA_SIGN].digest)
3950                         {
3951                         c->pkeys[SSL_PKEY_RSA_SIGN].digest = EVP_sha1();
3952                         c->pkeys[SSL_PKEY_RSA_ENC].digest = EVP_sha1();
3953                         }
3954 #endif
3955 #ifndef OPENSSL_NO_ECDSA
3956                 if (!c->pkeys[SSL_PKEY_ECC].digest)
3957                         c->pkeys[SSL_PKEY_ECC].digest = EVP_sha1();
3958 #endif
3959                 }
3960         return 1;
3961         }
3962
3963
3964 int SSL_get_sigalgs(SSL *s, int idx,
3965                         int *psign, int *phash, int *psignhash,
3966                         unsigned char *rsig, unsigned char *rhash)
3967         {
3968         const unsigned char *psig = s->cert->peer_sigalgs;
3969         if (psig == NULL)
3970                 return 0;
3971         if (idx >= 0)
3972                 {
3973                 idx <<= 1;
3974                 if (idx >= (int)s->cert->peer_sigalgslen)
3975                         return 0;
3976                 psig += idx;
3977                 if (rhash)
3978                         *rhash = psig[0];
3979                 if (rsig)
3980                         *rsig = psig[1];
3981                 tls1_lookup_sigalg(phash, psign, psignhash, psig);
3982                 }
3983         return s->cert->peer_sigalgslen / 2;
3984         }
3985
3986 int SSL_get_shared_sigalgs(SSL *s, int idx,
3987                         int *psign, int *phash, int *psignhash,
3988                         unsigned char *rsig, unsigned char *rhash)
3989         {
3990         TLS_SIGALGS *shsigalgs = s->cert->shared_sigalgs;
3991         if (!shsigalgs || idx >= (int)s->cert->shared_sigalgslen)
3992                 return 0;
3993         shsigalgs += idx;
3994         if (phash)
3995                 *phash = shsigalgs->hash_nid;
3996         if (psign)
3997                 *psign = shsigalgs->sign_nid;
3998         if (psignhash)
3999                 *psignhash = shsigalgs->signandhash_nid;
4000         if (rsig)
4001                 *rsig = shsigalgs->rsign;
4002         if (rhash)
4003                 *rhash = shsigalgs->rhash;
4004         return s->cert->shared_sigalgslen;
4005         }
4006
4007
4008 #ifndef OPENSSL_NO_HEARTBEATS
4009 int
4010 tls1_process_heartbeat(SSL *s)
4011         {
4012         unsigned char *p = &s->s3->rrec.data[0], *pl;
4013         unsigned short hbtype;
4014         unsigned int payload;
4015         unsigned int padding = 16; /* Use minimum padding */
4016
4017         if (s->msg_callback)
4018                 s->msg_callback(0, s->version, TLS1_RT_HEARTBEAT,
4019                         &s->s3->rrec.data[0], s->s3->rrec.length,
4020                         s, s->msg_callback_arg);
4021
4022         /* Read type and payload length first */
4023         if (1 + 2 + 16 > s->s3->rrec.length)
4024                 return 0; /* silently discard */
4025         hbtype = *p++;
4026         n2s(p, payload);
4027         if (1 + 2 + payload + 16 > s->s3->rrec.length)
4028                 return 0; /* silently discard per RFC 6520 sec. 4 */
4029         pl = p;
4030
4031         if (hbtype == TLS1_HB_REQUEST)
4032                 {
4033                 unsigned char *buffer, *bp;
4034                 int r;
4035
4036                 /* Allocate memory for the response, size is 1 bytes
4037                  * message type, plus 2 bytes payload length, plus
4038                  * payload, plus padding
4039                  */
4040                 buffer = OPENSSL_malloc(1 + 2 + payload + padding);
4041                 if (buffer == NULL)
4042                         {
4043                         SSLerr(SSL_F_TLS1_PROCESS_HEARTBEAT,ERR_R_MALLOC_FAILURE);
4044                         return -1;
4045                         }
4046                 bp = buffer;
4047
4048                 /* Enter response type, length and copy payload */
4049                 *bp++ = TLS1_HB_RESPONSE;
4050                 s2n(payload, bp);
4051                 memcpy(bp, pl, payload);
4052                 bp += payload;
4053                 /* Random padding */
4054                 RAND_pseudo_bytes(bp, padding);
4055
4056                 r = ssl3_write_bytes(s, TLS1_RT_HEARTBEAT, buffer, 3 + payload + padding);
4057
4058                 if (r >= 0 && s->msg_callback)
4059                         s->msg_callback(1, s->version, TLS1_RT_HEARTBEAT,
4060                                 buffer, 3 + payload + padding,
4061                                 s, s->msg_callback_arg);
4062
4063                 OPENSSL_free(buffer);
4064
4065                 if (r < 0)
4066                         return r;
4067                 }
4068         else if (hbtype == TLS1_HB_RESPONSE)
4069                 {
4070                 unsigned int seq;
4071
4072                 /* We only send sequence numbers (2 bytes unsigned int),
4073                  * and 16 random bytes, so we just try to read the
4074                  * sequence number */
4075                 n2s(pl, seq);
4076
4077                 if (payload == 18 && seq == s->tlsext_hb_seq)
4078                         {
4079                         s->tlsext_hb_seq++;
4080                         s->tlsext_hb_pending = 0;
4081                         }
4082                 }
4083
4084         return 0;
4085         }
4086
4087 int
4088 tls1_heartbeat(SSL *s)
4089         {
4090         unsigned char *buf, *p;
4091         int ret;
4092         unsigned int payload = 18; /* Sequence number + random bytes */
4093         unsigned int padding = 16; /* Use minimum padding */
4094
4095         /* Only send if peer supports and accepts HB requests... */
4096         if (!(s->tlsext_heartbeat & SSL_TLSEXT_HB_ENABLED) ||
4097             s->tlsext_heartbeat & SSL_TLSEXT_HB_DONT_SEND_REQUESTS)
4098                 {
4099                 SSLerr(SSL_F_TLS1_HEARTBEAT,SSL_R_TLS_HEARTBEAT_PEER_DOESNT_ACCEPT);
4100                 return -1;
4101                 }
4102
4103         /* ...and there is none in flight yet... */
4104         if (s->tlsext_hb_pending)
4105                 {
4106                 SSLerr(SSL_F_TLS1_HEARTBEAT,SSL_R_TLS_HEARTBEAT_PENDING);
4107                 return -1;
4108                 }
4109
4110         /* ...and no handshake in progress. */
4111         if (SSL_in_init(s) || s->in_handshake)
4112                 {
4113                 SSLerr(SSL_F_TLS1_HEARTBEAT,SSL_R_UNEXPECTED_MESSAGE);
4114                 return -1;
4115                 }
4116
4117         /* Check if padding is too long, payload and padding
4118          * must not exceed 2^14 - 3 = 16381 bytes in total.
4119          */
4120         OPENSSL_assert(payload + padding <= 16381);
4121
4122         /*-
4123          * Create HeartBeat message, we just use a sequence number
4124          * as payload to distuingish different messages and add
4125          * some random stuff.
4126          *  - Message Type, 1 byte
4127          *  - Payload Length, 2 bytes (unsigned int)
4128          *  - Payload, the sequence number (2 bytes uint)
4129          *  - Payload, random bytes (16 bytes uint)
4130          *  - Padding
4131          */
4132         buf = OPENSSL_malloc(1 + 2 + payload + padding);
4133         if (buf == NULL)
4134                 {
4135                 SSLerr(SSL_F_TLS1_HEARTBEAT,ERR_R_MALLOC_FAILURE);
4136                 return -1;
4137                 }
4138         p = buf;
4139         /* Message Type */
4140         *p++ = TLS1_HB_REQUEST;
4141         /* Payload length (18 bytes here) */
4142         s2n(payload, p);
4143         /* Sequence number */
4144         s2n(s->tlsext_hb_seq, p);
4145         /* 16 random bytes */
4146         RAND_pseudo_bytes(p, 16);
4147         p += 16;
4148         /* Random padding */
4149         RAND_pseudo_bytes(p, padding);
4150
4151         ret = ssl3_write_bytes(s, TLS1_RT_HEARTBEAT, buf, 3 + payload + padding);
4152         if (ret >= 0)
4153                 {
4154                 if (s->msg_callback)
4155                         s->msg_callback(1, s->version, TLS1_RT_HEARTBEAT,
4156                                 buf, 3 + payload + padding,
4157                                 s, s->msg_callback_arg);
4158
4159                 s->tlsext_hb_pending = 1;
4160                 }
4161
4162         OPENSSL_free(buf);
4163
4164         return ret;
4165         }
4166 #endif
4167
4168 #define MAX_SIGALGLEN   (TLSEXT_hash_num * TLSEXT_signature_num * 2)
4169
4170 typedef struct
4171         {
4172         size_t sigalgcnt;
4173         int sigalgs[MAX_SIGALGLEN];
4174         } sig_cb_st;
4175
4176 static int sig_cb(const char *elem, int len, void *arg)
4177         {
4178         sig_cb_st *sarg = arg;
4179         size_t i;
4180         char etmp[20], *p;
4181         int sig_alg, hash_alg;
4182         if (sarg->sigalgcnt == MAX_SIGALGLEN)
4183                 return 0;
4184         if (len > (int)(sizeof(etmp) - 1))
4185                 return 0;
4186         memcpy(etmp, elem, len);
4187         etmp[len] = 0;
4188         p = strchr(etmp, '+');
4189         if (!p)
4190                 return 0;
4191         *p = 0;
4192         p++;
4193         if (!*p)
4194                 return 0;
4195
4196         if (!strcmp(etmp, "RSA"))
4197                 sig_alg = EVP_PKEY_RSA;
4198         else if (!strcmp(etmp, "DSA"))
4199                 sig_alg = EVP_PKEY_DSA;
4200         else if (!strcmp(etmp, "ECDSA"))
4201                 sig_alg = EVP_PKEY_EC;
4202         else return 0;
4203
4204         hash_alg = OBJ_sn2nid(p);
4205         if (hash_alg == NID_undef)
4206                 hash_alg = OBJ_ln2nid(p);
4207         if (hash_alg == NID_undef)
4208                 return 0;
4209
4210         for (i = 0; i < sarg->sigalgcnt; i+=2)
4211                 {
4212                 if (sarg->sigalgs[i] == sig_alg
4213                         && sarg->sigalgs[i + 1] == hash_alg)
4214                         return 0;
4215                 }
4216         sarg->sigalgs[sarg->sigalgcnt++] = hash_alg;
4217         sarg->sigalgs[sarg->sigalgcnt++] = sig_alg;
4218         return 1;
4219         }
4220
4221 /* Set suppored signature algorithms based on a colon separated list
4222  * of the form sig+hash e.g. RSA+SHA512:DSA+SHA512 */
4223 int tls1_set_sigalgs_list(CERT *c, const char *str, int client)
4224         {
4225         sig_cb_st sig;
4226         sig.sigalgcnt = 0;
4227         if (!CONF_parse_list(str, ':', 1, sig_cb, &sig))
4228                 return 0;
4229         if (c == NULL)
4230                 return 1;
4231         return tls1_set_sigalgs(c, sig.sigalgs, sig.sigalgcnt, client);
4232         }
4233
4234 int tls1_set_sigalgs(CERT *c, const int *psig_nids, size_t salglen, int client)
4235         {
4236         unsigned char *sigalgs, *sptr;
4237         int rhash, rsign;
4238         size_t i;
4239         if (salglen & 1)
4240                 return 0;
4241         sigalgs = OPENSSL_malloc(salglen);
4242         if (sigalgs == NULL)
4243                 return 0;
4244         for (i = 0, sptr = sigalgs; i < salglen; i+=2)
4245                 {
4246                 rhash = tls12_find_id(*psig_nids++, tls12_md,
4247                                         sizeof(tls12_md)/sizeof(tls12_lookup));
4248                 rsign = tls12_find_id(*psig_nids++, tls12_sig,
4249                                 sizeof(tls12_sig)/sizeof(tls12_lookup));
4250
4251                 if (rhash == -1 || rsign == -1)
4252                         goto err;
4253                 *sptr++ = rhash;
4254                 *sptr++ = rsign;
4255                 }
4256
4257         if (client)
4258                 {
4259                 if (c->client_sigalgs)
4260                         OPENSSL_free(c->client_sigalgs);
4261                 c->client_sigalgs = sigalgs;
4262                 c->client_sigalgslen = salglen;
4263                 }
4264         else
4265                 {
4266                 if (c->conf_sigalgs)
4267                         OPENSSL_free(c->conf_sigalgs);
4268                 c->conf_sigalgs = sigalgs;
4269                 c->conf_sigalgslen = salglen;
4270                 }
4271
4272         return 1;
4273
4274         err:
4275         OPENSSL_free(sigalgs);
4276         return 0;
4277         }
4278
4279 static int tls1_check_sig_alg(CERT *c, X509 *x, int default_nid)
4280         {
4281         int sig_nid;
4282         size_t i;
4283         if (default_nid == -1)
4284                 return 1;
4285         sig_nid = X509_get_signature_nid(x);
4286         if (default_nid)
4287                 return sig_nid == default_nid ? 1 : 0;
4288         for (i = 0; i < c->shared_sigalgslen; i++)
4289                 if (sig_nid == c->shared_sigalgs[i].signandhash_nid)
4290                         return 1;
4291         return 0;
4292         }
4293 /* Check to see if a certificate issuer name matches list of CA names */
4294 static int ssl_check_ca_name(STACK_OF(X509_NAME) *names, X509 *x)
4295         {
4296         X509_NAME *nm;
4297         int i;
4298         nm = X509_get_issuer_name(x);
4299         for (i = 0; i < sk_X509_NAME_num(names); i++)
4300                 {
4301                 if(!X509_NAME_cmp(nm, sk_X509_NAME_value(names, i)))
4302                         return 1;
4303                 }
4304         return 0;
4305         }
4306
4307 /* Check certificate chain is consistent with TLS extensions and is
4308  * usable by server. This servers two purposes: it allows users to
4309  * check chains before passing them to the server and it allows the
4310  * server to check chains before attempting to use them.
4311  */
4312
4313 /* Flags which need to be set for a certificate when stict mode not set */
4314
4315 #define CERT_PKEY_VALID_FLAGS \
4316         (CERT_PKEY_EE_SIGNATURE|CERT_PKEY_EE_PARAM)
4317 /* Strict mode flags */
4318 #define CERT_PKEY_STRICT_FLAGS \
4319          (CERT_PKEY_VALID_FLAGS|CERT_PKEY_CA_SIGNATURE|CERT_PKEY_CA_PARAM \
4320          | CERT_PKEY_ISSUER_NAME|CERT_PKEY_CERT_TYPE)
4321
4322 int tls1_check_chain(SSL *s, X509 *x, EVP_PKEY *pk, STACK_OF(X509) *chain,
4323                                                                         int idx)
4324         {
4325         int i;
4326         int rv = 0;
4327         int check_flags = 0, strict_mode;
4328         CERT_PKEY *cpk = NULL;
4329         CERT *c = s->cert;
4330         unsigned int suiteb_flags = tls1_suiteb(s);
4331         /* idx == -1 means checking server chains */
4332         if (idx != -1)
4333                 {
4334                 /* idx == -2 means checking client certificate chains */
4335                 if (idx == -2)
4336                         {
4337                         cpk = c->key;
4338                         idx = cpk - c->pkeys;
4339                         }
4340                 else
4341                         cpk = c->pkeys + idx;
4342                 x = cpk->x509;
4343                 pk = cpk->privatekey;
4344                 chain = cpk->chain;
4345                 strict_mode = c->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT;
4346                 /* If no cert or key, forget it */
4347                 if (!x || !pk)
4348                         goto end;
4349 #ifdef OPENSSL_SSL_DEBUG_BROKEN_PROTOCOL
4350                 /* Allow any certificate to pass test */
4351                 if (s->cert->cert_flags & SSL_CERT_FLAG_BROKEN_PROTOCOL)
4352                         {
4353                         rv = CERT_PKEY_STRICT_FLAGS|CERT_PKEY_EXPLICIT_SIGN|CERT_PKEY_VALID|CERT_PKEY_SIGN;
4354                         cpk->valid_flags = rv;
4355                         return rv;
4356                         }
4357 #endif
4358                 }
4359         else
4360                 {
4361                 if (!x || !pk)
4362                         goto end;
4363                 idx = ssl_cert_type(x, pk);
4364                 if (idx == -1)
4365                         goto end;
4366                 cpk = c->pkeys + idx;
4367                 if (c->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT)
4368                         check_flags = CERT_PKEY_STRICT_FLAGS;
4369                 else
4370                         check_flags = CERT_PKEY_VALID_FLAGS;
4371                 strict_mode = 1;
4372                 }
4373
4374         if (suiteb_flags)
4375                 {
4376                 int ok;
4377                 if (check_flags)
4378                         check_flags |= CERT_PKEY_SUITEB;
4379                 ok = X509_chain_check_suiteb(NULL, x, chain, suiteb_flags);
4380                 if (ok == X509_V_OK)
4381                         rv |= CERT_PKEY_SUITEB;
4382                 else if (!check_flags)
4383                         goto end;
4384                 }
4385
4386         /* Check all signature algorithms are consistent with
4387          * signature algorithms extension if TLS 1.2 or later
4388          * and strict mode.
4389          */
4390         if (TLS1_get_version(s) >= TLS1_2_VERSION && strict_mode)
4391                 {
4392                 int default_nid;
4393                 unsigned char rsign = 0;
4394                 if (c->peer_sigalgs)
4395                         default_nid = 0;
4396                 /* If no sigalgs extension use defaults from RFC5246 */
4397                 else
4398                         {
4399                         switch(idx)
4400                                 {
4401                         case SSL_PKEY_RSA_ENC:
4402                         case SSL_PKEY_RSA_SIGN:
4403                         case SSL_PKEY_DH_RSA:
4404                                 rsign = TLSEXT_signature_rsa;
4405                                 default_nid = NID_sha1WithRSAEncryption;
4406                                 break;
4407
4408                         case SSL_PKEY_DSA_SIGN:
4409                         case SSL_PKEY_DH_DSA:
4410                                 rsign = TLSEXT_signature_dsa;
4411                                 default_nid = NID_dsaWithSHA1;
4412                                 break;
4413
4414                         case SSL_PKEY_ECC:
4415                                 rsign = TLSEXT_signature_ecdsa;
4416                                 default_nid = NID_ecdsa_with_SHA1;
4417                                 break;
4418
4419                         default:
4420                                 default_nid = -1;
4421                                 break;
4422                                 }
4423                         }
4424                 /* If peer sent no signature algorithms extension and we
4425                  * have set preferred signature algorithms check we support
4426                  * sha1.
4427                  */
4428                 if (default_nid > 0 && c->conf_sigalgs)
4429                         {
4430                         size_t j;
4431                         const unsigned char *p = c->conf_sigalgs;
4432                         for (j = 0; j < c->conf_sigalgslen; j += 2, p += 2)
4433                                 {
4434                                 if (p[0] == TLSEXT_hash_sha1 && p[1] == rsign)
4435                                         break;
4436                                 }
4437                         if (j == c->conf_sigalgslen)
4438                                 {
4439                                 if (check_flags)
4440                                         goto skip_sigs;
4441                                 else
4442                                         goto end;
4443                                 }
4444                         }
4445                 /* Check signature algorithm of each cert in chain */
4446                 if (!tls1_check_sig_alg(c, x, default_nid))
4447                         {
4448                         if (!check_flags) goto end;
4449                         }
4450                 else
4451                         rv |= CERT_PKEY_EE_SIGNATURE;
4452                 rv |= CERT_PKEY_CA_SIGNATURE;
4453                 for (i = 0; i < sk_X509_num(chain); i++)
4454                         {
4455                         if (!tls1_check_sig_alg(c, sk_X509_value(chain, i),
4456                                                         default_nid))
4457                                 {
4458                                 if (check_flags)
4459                                         {
4460                                         rv &= ~CERT_PKEY_CA_SIGNATURE;
4461                                         break;
4462                                         }
4463                                 else
4464                                         goto end;
4465                                 }
4466                         }
4467                 }
4468         /* Else not TLS 1.2, so mark EE and CA signing algorithms OK */
4469         else if(check_flags)
4470                 rv |= CERT_PKEY_EE_SIGNATURE|CERT_PKEY_CA_SIGNATURE;
4471         skip_sigs:
4472         /* Check cert parameters are consistent */
4473         if (tls1_check_cert_param(s, x, check_flags ? 1 : 2))
4474                 rv |= CERT_PKEY_EE_PARAM;
4475         else if (!check_flags)
4476                 goto end;
4477         if (!s->server)
4478                 rv |= CERT_PKEY_CA_PARAM;
4479         /* In strict mode check rest of chain too */
4480         else if (strict_mode)
4481                 {
4482                 rv |= CERT_PKEY_CA_PARAM;
4483                 for (i = 0; i < sk_X509_num(chain); i++)
4484                         {
4485                         X509 *ca = sk_X509_value(chain, i);
4486                         if (!tls1_check_cert_param(s, ca, 0))
4487                                 {
4488                                 if (check_flags)
4489                                         {
4490                                         rv &= ~CERT_PKEY_CA_PARAM;
4491                                         break;
4492                                         }
4493                                 else
4494                                         goto end;
4495                                 }
4496                         }
4497                 }
4498         if (!s->server && strict_mode)
4499                 {
4500                 STACK_OF(X509_NAME) *ca_dn;
4501                 int check_type = 0;
4502                 switch (pk->type)
4503                         {
4504                 case EVP_PKEY_RSA:
4505                         check_type = TLS_CT_RSA_SIGN;
4506                         break;
4507                 case EVP_PKEY_DSA:
4508                         check_type = TLS_CT_DSS_SIGN;
4509                         break;
4510                 case EVP_PKEY_EC:
4511                         check_type = TLS_CT_ECDSA_SIGN;
4512                         break;
4513                 case EVP_PKEY_DH:
4514                 case EVP_PKEY_DHX:
4515                                 {
4516                                 int cert_type = X509_certificate_type(x, pk);
4517                                 if (cert_type & EVP_PKS_RSA)
4518                                         check_type = TLS_CT_RSA_FIXED_DH;
4519                                 if (cert_type & EVP_PKS_DSA)
4520                                         check_type = TLS_CT_DSS_FIXED_DH;
4521                                 }
4522                         }
4523                 if (check_type)
4524                         {
4525                         const unsigned char *ctypes;
4526                         int ctypelen;
4527                         if (c->ctypes)
4528                                 {
4529                                 ctypes = c->ctypes;
4530                                 ctypelen = (int)c->ctype_num;
4531                                 }
4532                         else
4533                                 {
4534                                 ctypes = (unsigned char *)s->s3->tmp.ctype;
4535                                 ctypelen = s->s3->tmp.ctype_num;
4536                                 }
4537                         for (i = 0; i < ctypelen; i++)
4538                                 {
4539                                 if (ctypes[i] == check_type)
4540                                         {
4541                                         rv |= CERT_PKEY_CERT_TYPE;
4542                                         break;
4543                                         }
4544                                 }
4545                         if (!(rv & CERT_PKEY_CERT_TYPE) && !check_flags)
4546                                 goto end;
4547                         }
4548                 else
4549                         rv |= CERT_PKEY_CERT_TYPE;
4550
4551
4552                 ca_dn = s->s3->tmp.ca_names;
4553
4554                 if (!sk_X509_NAME_num(ca_dn))
4555                         rv |= CERT_PKEY_ISSUER_NAME;
4556
4557                 if (!(rv & CERT_PKEY_ISSUER_NAME))
4558                         {
4559                         if (ssl_check_ca_name(ca_dn, x))
4560                                 rv |= CERT_PKEY_ISSUER_NAME;
4561                         }
4562                 if (!(rv & CERT_PKEY_ISSUER_NAME))
4563                         {
4564                         for (i = 0; i < sk_X509_num(chain); i++)
4565                                 {
4566                                 X509 *xtmp = sk_X509_value(chain, i);
4567                                 if (ssl_check_ca_name(ca_dn, xtmp))
4568                                         {
4569                                         rv |= CERT_PKEY_ISSUER_NAME;
4570                                         break;
4571                                         }
4572                                 }
4573                         }
4574                 if (!check_flags && !(rv & CERT_PKEY_ISSUER_NAME))
4575                         goto end;
4576                 }
4577         else
4578                 rv |= CERT_PKEY_ISSUER_NAME|CERT_PKEY_CERT_TYPE;
4579
4580         if (!check_flags || (rv & check_flags) == check_flags)
4581                 rv |= CERT_PKEY_VALID;
4582
4583         end:
4584
4585         if (TLS1_get_version(s) >= TLS1_2_VERSION)
4586                 {
4587                 if (cpk->valid_flags & CERT_PKEY_EXPLICIT_SIGN)
4588                         rv |= CERT_PKEY_EXPLICIT_SIGN|CERT_PKEY_SIGN;
4589                 else if (cpk->digest)
4590                         rv |= CERT_PKEY_SIGN;
4591                 }
4592         else
4593                 rv |= CERT_PKEY_SIGN|CERT_PKEY_EXPLICIT_SIGN;
4594
4595         /* When checking a CERT_PKEY structure all flags are irrelevant
4596          * if the chain is invalid.
4597          */
4598         if (!check_flags)
4599                 {
4600                 if (rv & CERT_PKEY_VALID)
4601                         cpk->valid_flags = rv;
4602                 else
4603                         {
4604                         /* Preserve explicit sign flag, clear rest */
4605                         cpk->valid_flags &= CERT_PKEY_EXPLICIT_SIGN;
4606                         return 0;
4607                         }
4608                 }
4609         return rv;
4610         }
4611
4612 /* Set validity of certificates in an SSL structure */
4613 void tls1_set_cert_validity(SSL *s)
4614         {
4615         tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_RSA_ENC);
4616         tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_RSA_SIGN);
4617         tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_DSA_SIGN);
4618         tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_DH_RSA);
4619         tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_DH_DSA);
4620         tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_ECC);
4621         }
4622 /* User level utiity function to check a chain is suitable */
4623 int SSL_check_chain(SSL *s, X509 *x, EVP_PKEY *pk, STACK_OF(X509) *chain)
4624         {
4625         return tls1_check_chain(s, x, pk, chain, -1);
4626         }
4627
4628 #endif
4629
4630 #ifndef OPENSSL_NO_DH
4631 DH *ssl_get_auto_dh(SSL *s)
4632         {
4633         int dh_secbits = 80;
4634         if (s->cert->dh_tmp_auto == 2)
4635                 return DH_get_1024_160();
4636         if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
4637                 {
4638                 if (s->s3->tmp.new_cipher->strength_bits == 256)
4639                         dh_secbits = 128;
4640                 else
4641                         dh_secbits = 80;
4642                 }
4643         else
4644                 {
4645                 CERT_PKEY *cpk = ssl_get_server_send_pkey(s);
4646                 dh_secbits = EVP_PKEY_security_bits(cpk->privatekey);
4647                 }
4648
4649         if (dh_secbits >= 128)
4650                 {
4651                 DH *dhp = DH_new();
4652                 if (!dhp)
4653                         return NULL;
4654                 dhp->g = BN_new();
4655                 if (dhp->g)
4656                         BN_set_word(dhp->g, 2);
4657                 if (dh_secbits >= 192)
4658                         dhp->p = get_rfc3526_prime_8192(NULL);
4659                 else
4660                         dhp->p = get_rfc3526_prime_3072(NULL);
4661                 if (!dhp->p || !dhp->g)
4662                         {
4663                         DH_free(dhp);
4664                         return NULL;
4665                         }
4666                 return dhp;
4667                 }
4668         if (dh_secbits >= 112)
4669                 return DH_get_2048_224();
4670         return DH_get_1024_160();
4671         }
4672 #endif
4673
4674 static int ssl_security_cert_key(SSL *s, SSL_CTX *ctx, X509 *x, int op)
4675         {
4676         int secbits;
4677         EVP_PKEY *pkey = X509_get_pubkey(x);
4678         if (pkey)
4679                 {
4680                 secbits = EVP_PKEY_security_bits(pkey);
4681                 EVP_PKEY_free(pkey);
4682                 }
4683         else
4684                 secbits = -1;
4685         if (s)
4686                 return ssl_security(s, op, secbits, 0, x);
4687         else
4688                 return ssl_ctx_security(ctx, op, secbits, 0, x);
4689         }
4690
4691 static int ssl_security_cert_sig(SSL *s, SSL_CTX *ctx, X509 *x, int op)
4692         {
4693         /* Lookup signature algorithm digest */
4694         int secbits = -1, md_nid = NID_undef, sig_nid;
4695         sig_nid = X509_get_signature_nid(x);
4696         if (sig_nid && OBJ_find_sigid_algs(sig_nid, &md_nid, NULL))
4697                 {
4698                 const EVP_MD *md;
4699                 if (md_nid && (md = EVP_get_digestbynid(md_nid)))
4700                                 secbits = EVP_MD_size(md) * 4;
4701                 }
4702         if (s)
4703                 return ssl_security(s, op, secbits, md_nid, x);
4704         else
4705                 return ssl_ctx_security(ctx, op, secbits, md_nid, x);
4706         }
4707
4708 int ssl_security_cert(SSL *s, SSL_CTX *ctx, X509 *x, int vfy, int is_ee)
4709         {
4710         if (vfy)
4711                 vfy = SSL_SECOP_PEER;
4712         if (is_ee)
4713                 {
4714                 if (!ssl_security_cert_key(s, ctx, x, SSL_SECOP_EE_KEY | vfy))
4715                         return SSL_R_EE_KEY_TOO_SMALL;
4716                 }
4717         else
4718                 {
4719                 if (!ssl_security_cert_key(s, ctx, x, SSL_SECOP_CA_KEY | vfy))
4720                         return SSL_R_CA_KEY_TOO_SMALL;
4721                 }
4722         if (!ssl_security_cert_sig(s, ctx, x, SSL_SECOP_CA_MD | vfy))
4723                 return SSL_R_CA_MD_TOO_WEAK;
4724         return 1;
4725         }
4726
4727 /* Check security of a chain, if sk includes the end entity certificate
4728  * then x is NULL. If vfy is 1 then we are verifying a peer chain and
4729  * not sending one to the peer.
4730  * Return values: 1 if ok otherwise error code to use
4731  */
4732
4733 int ssl_security_cert_chain(SSL *s, STACK_OF(X509) *sk, X509 *x, int vfy)
4734         {
4735         int rv, start_idx, i;
4736         if (x == NULL)
4737                 {
4738                 x = sk_X509_value(sk, 0);
4739                 start_idx = 1;
4740                 }
4741         else
4742                 start_idx = 0;
4743
4744         rv = ssl_security_cert(s, NULL, x, vfy, 1);
4745         if (rv != 1)
4746                 return rv;
4747
4748         for (i = start_idx; i < sk_X509_num(sk); i++)
4749                 {
4750                 x = sk_X509_value(sk, i);
4751                 rv = ssl_security_cert(s, NULL, x, vfy, 0);
4752                 if (rv != 1)
4753                         return rv;
4754                 }
4755         return 1;
4756         }