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 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 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         if(SSL_IS_DTLS(s) && SSL_get_srtp_profiles(s))
1505                 {
1506                 int el;
1507
1508                 ssl_add_clienthello_use_srtp_ext(s, 0, &el, 0);
1509
1510                 if((limit - ret - 4 - el) < 0) return NULL;
1511
1512                 s2n(TLSEXT_TYPE_use_srtp,ret);
1513                 s2n(el,ret);
1514
1515                 if(ssl_add_clienthello_use_srtp_ext(s, ret, &el, el))
1516                         {
1517                         SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1518                         return NULL;
1519                         }
1520                 ret += el;
1521                 }
1522         custom_ext_init(&s->cert->cli_ext);
1523         /* Add custom TLS Extensions to ClientHello */
1524         if (!custom_ext_add(s, 0, &ret, limit, al))
1525                 return NULL;
1526 #ifdef TLSEXT_TYPE_encrypt_then_mac
1527         s2n(TLSEXT_TYPE_encrypt_then_mac,ret);
1528         s2n(0,ret);
1529 #endif
1530
1531         /* Add padding to workaround bugs in F5 terminators.
1532          * See https://tools.ietf.org/html/draft-agl-tls-padding-03
1533          *
1534          * NB: because this code works out the length of all existing
1535          * extensions it MUST always appear last.
1536          */
1537         if (s->options & SSL_OP_TLSEXT_PADDING)
1538                 {
1539                 int hlen = ret - (unsigned char *)s->init_buf->data;
1540                 /* The code in s23_clnt.c to build ClientHello messages
1541                  * includes the 5-byte record header in the buffer, while
1542                  * the code in s3_clnt.c does not.
1543                  */
1544                 if (s->state == SSL23_ST_CW_CLNT_HELLO_A)
1545                         hlen -= 5;
1546                 if (hlen > 0xff && hlen < 0x200)
1547                         {
1548                         hlen = 0x200 - hlen;
1549                         if (hlen >= 4)
1550                                 hlen -= 4;
1551                         else
1552                                 hlen = 0;
1553
1554                         s2n(TLSEXT_TYPE_padding, ret);
1555                         s2n(hlen, ret);
1556                         memset(ret, 0, hlen);
1557                         ret += hlen;
1558                         }
1559                 }
1560
1561         done:
1562
1563         if ((extdatalen = ret-orig-2)== 0)
1564                 return orig;
1565
1566         s2n(extdatalen, orig);
1567         return ret;
1568         }
1569
1570 unsigned char *ssl_add_serverhello_tlsext(SSL *s, unsigned char *buf, unsigned char *limit, int *al)
1571         {
1572         int extdatalen=0;
1573         unsigned char *orig = buf;
1574         unsigned char *ret = buf;
1575 #ifndef OPENSSL_NO_NEXTPROTONEG
1576         int next_proto_neg_seen;
1577 #endif
1578 #ifndef OPENSSL_NO_EC
1579         unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
1580         unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth;
1581         int using_ecc = (alg_k & (SSL_kECDHE|SSL_kECDHr|SSL_kECDHe)) || (alg_a & SSL_aECDSA);
1582         using_ecc = using_ecc && (s->session->tlsext_ecpointformatlist != NULL);
1583 #endif
1584
1585         ret+=2;
1586         if (ret>=limit) return NULL; /* this really never occurs, but ... */
1587
1588         if(s->s3->send_connection_binding)
1589         {
1590           int el;
1591
1592           if(!ssl_add_serverhello_renegotiate_ext(s, 0, &el, 0))
1593               {
1594               SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1595               return NULL;
1596               }
1597
1598           if((limit - ret - 4 - el) < 0) return NULL;
1599
1600           s2n(TLSEXT_TYPE_renegotiate,ret);
1601           s2n(el,ret);
1602
1603           if(!ssl_add_serverhello_renegotiate_ext(s, ret, &el, el))
1604               {
1605               SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1606               return NULL;
1607               }
1608
1609           ret += el;
1610         }
1611
1612         /* Only add RI for SSLv3 */
1613         if (s->version == SSL3_VERSION)
1614                 goto done;
1615
1616         if (!s->hit && s->servername_done == 1 && s->session->tlsext_hostname != NULL)
1617                 {
1618                 if ((long)(limit - ret - 4) < 0) return NULL;
1619
1620                 s2n(TLSEXT_TYPE_server_name,ret);
1621                 s2n(0,ret);
1622                 }
1623
1624 #ifndef OPENSSL_NO_EC
1625         if (using_ecc)
1626                 {
1627                 const unsigned char *plist;
1628                 size_t plistlen;
1629                 /* Add TLS extension ECPointFormats to the ServerHello message */
1630                 long lenmax;
1631
1632                 tls1_get_formatlist(s, &plist, &plistlen);
1633
1634                 if ((lenmax = limit - ret - 5) < 0) return NULL;
1635                 if (plistlen > (size_t)lenmax) return NULL;
1636                 if (plistlen > 255)
1637                         {
1638                         SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1639                         return NULL;
1640                         }
1641
1642                 s2n(TLSEXT_TYPE_ec_point_formats,ret);
1643                 s2n(plistlen + 1,ret);
1644                 *(ret++) = (unsigned char) plistlen;
1645                 memcpy(ret, plist, plistlen);
1646                 ret+=plistlen;
1647
1648                 }
1649         /* Currently the server should not respond with a SupportedCurves extension */
1650 #endif /* OPENSSL_NO_EC */
1651
1652         if (s->tlsext_ticket_expected && tls_use_ticket(s))
1653                 {
1654                 if ((long)(limit - ret - 4) < 0) return NULL;
1655                 s2n(TLSEXT_TYPE_session_ticket,ret);
1656                 s2n(0,ret);
1657                 }
1658
1659         if (s->tlsext_status_expected)
1660                 {
1661                 if ((long)(limit - ret - 4) < 0) return NULL;
1662                 s2n(TLSEXT_TYPE_status_request,ret);
1663                 s2n(0,ret);
1664                 }
1665
1666 #ifdef TLSEXT_TYPE_opaque_prf_input
1667         if (s->s3->server_opaque_prf_input != NULL)
1668                 {
1669                 size_t sol = s->s3->server_opaque_prf_input_len;
1670
1671                 if ((long)(limit - ret - 6 - sol) < 0)
1672                         return NULL;
1673                 if (sol > 0xFFFD) /* can't happen */
1674                         return NULL;
1675
1676                 s2n(TLSEXT_TYPE_opaque_prf_input, ret);
1677                 s2n(sol + 2, ret);
1678                 s2n(sol, ret);
1679                 memcpy(ret, s->s3->server_opaque_prf_input, sol);
1680                 ret += sol;
1681                 }
1682 #endif
1683
1684         if(SSL_IS_DTLS(s) && s->srtp_profile)
1685                 {
1686                 int el;
1687
1688                 ssl_add_serverhello_use_srtp_ext(s, 0, &el, 0);
1689
1690                 if((limit - ret - 4 - el) < 0) return NULL;
1691
1692                 s2n(TLSEXT_TYPE_use_srtp,ret);
1693                 s2n(el,ret);
1694
1695                 if(ssl_add_serverhello_use_srtp_ext(s, ret, &el, el))
1696                         {
1697                         SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1698                         return NULL;
1699                         }
1700                 ret+=el;
1701                 }
1702
1703         if (((s->s3->tmp.new_cipher->id & 0xFFFF)==0x80 || (s->s3->tmp.new_cipher->id & 0xFFFF)==0x81)
1704                 && (SSL_get_options(s) & SSL_OP_CRYPTOPRO_TLSEXT_BUG))
1705                 { const unsigned char cryptopro_ext[36] = {
1706                         0xfd, 0xe8, /*65000*/
1707                         0x00, 0x20, /*32 bytes length*/
1708                         0x30, 0x1e, 0x30, 0x08, 0x06, 0x06, 0x2a, 0x85,
1709                         0x03,   0x02, 0x02, 0x09, 0x30, 0x08, 0x06, 0x06,
1710                         0x2a, 0x85, 0x03, 0x02, 0x02, 0x16, 0x30, 0x08,
1711                         0x06, 0x06, 0x2a, 0x85, 0x03, 0x02, 0x02, 0x17};
1712                         if (limit-ret<36) return NULL;
1713                         memcpy(ret,cryptopro_ext,36);
1714                         ret+=36;
1715
1716                 }
1717
1718 #ifndef OPENSSL_NO_HEARTBEATS
1719         /* Add Heartbeat extension if we've received one */
1720         if (s->tlsext_heartbeat & SSL_TLSEXT_HB_ENABLED)
1721                 {
1722                 if ((limit - ret - 4 - 1) < 0)
1723                         return NULL;
1724                 s2n(TLSEXT_TYPE_heartbeat,ret);
1725                 s2n(1,ret);
1726                 /*-
1727                  * Set mode:
1728                  * 1: peer may send requests
1729                  * 2: peer not allowed to send requests
1730                  */
1731                 if (s->tlsext_heartbeat & SSL_TLSEXT_HB_DONT_RECV_REQUESTS)
1732                         *(ret++) = SSL_TLSEXT_HB_DONT_SEND_REQUESTS;
1733                 else
1734                         *(ret++) = SSL_TLSEXT_HB_ENABLED;
1735
1736                 }
1737 #endif
1738
1739 #ifndef OPENSSL_NO_NEXTPROTONEG
1740         next_proto_neg_seen = s->s3->next_proto_neg_seen;
1741         s->s3->next_proto_neg_seen = 0;
1742         if (next_proto_neg_seen && s->ctx->next_protos_advertised_cb)
1743                 {
1744                 const unsigned char *npa;
1745                 unsigned int npalen;
1746                 int r;
1747
1748                 r = s->ctx->next_protos_advertised_cb(s, &npa, &npalen, s->ctx->next_protos_advertised_cb_arg);
1749                 if (r == SSL_TLSEXT_ERR_OK)
1750                         {
1751                         if ((long)(limit - ret - 4 - npalen) < 0) return NULL;
1752                         s2n(TLSEXT_TYPE_next_proto_neg,ret);
1753                         s2n(npalen,ret);
1754                         memcpy(ret, npa, npalen);
1755                         ret += npalen;
1756                         s->s3->next_proto_neg_seen = 1;
1757                         }
1758                 }
1759 #endif
1760         if (!custom_ext_add(s, 1, &ret, limit, al))
1761                 return NULL;
1762 #ifdef TLSEXT_TYPE_encrypt_then_mac
1763         if (s->s3->flags & TLS1_FLAGS_ENCRYPT_THEN_MAC)
1764                 {
1765                 /* Don't use encrypt_then_mac if AEAD or RC4
1766                  * might want to disable for other cases too.
1767                  */
1768                 if (s->s3->tmp.new_cipher->algorithm_mac == SSL_AEAD
1769                     || s->s3->tmp.new_cipher->algorithm_enc == SSL_RC4)
1770                         s->s3->flags &= ~TLS1_FLAGS_ENCRYPT_THEN_MAC;
1771                 else
1772                         {
1773                         s2n(TLSEXT_TYPE_encrypt_then_mac,ret);
1774                         s2n(0,ret);
1775                         }
1776                 }
1777 #endif
1778
1779         if (s->s3->alpn_selected)
1780                 {
1781                 const unsigned char *selected = s->s3->alpn_selected;
1782                 unsigned len = s->s3->alpn_selected_len;
1783
1784                 if ((long)(limit - ret - 4 - 2 - 1 - len) < 0)
1785                         return NULL;
1786                 s2n(TLSEXT_TYPE_application_layer_protocol_negotiation,ret);
1787                 s2n(3 + len,ret);
1788                 s2n(1 + len,ret);
1789                 *ret++ = len;
1790                 memcpy(ret, selected, len);
1791                 ret += len;
1792                 }
1793
1794         done:
1795
1796         if ((extdatalen = ret-orig-2)== 0)
1797                 return orig;
1798
1799         s2n(extdatalen, orig);
1800         return ret;
1801         }
1802
1803 /* tls1_alpn_handle_client_hello is called to process the ALPN extension in a
1804  * ClientHello.
1805  *   data: the contents of the extension, not including the type and length.
1806  *   data_len: the number of bytes in |data|
1807  *   al: a pointer to the alert value to send in the event of a non-zero
1808  *       return.
1809  *
1810  *   returns: 0 on success. */
1811 static int tls1_alpn_handle_client_hello(SSL *s, const unsigned char *data,
1812                                          unsigned data_len, int *al)
1813         {
1814         unsigned i;
1815         unsigned proto_len;
1816         const unsigned char *selected;
1817         unsigned char selected_len;
1818         int r;
1819
1820         if (s->ctx->alpn_select_cb == NULL)
1821                 return 0;
1822
1823         if (data_len < 2)
1824                 goto parse_error;
1825
1826         /* data should contain a uint16 length followed by a series of 8-bit,
1827          * length-prefixed strings. */
1828         i = ((unsigned) data[0]) << 8 |
1829             ((unsigned) data[1]);
1830         data_len -= 2;
1831         data += 2;
1832         if (data_len != i)
1833                 goto parse_error;
1834
1835         if (data_len < 2)
1836                 goto parse_error;
1837
1838         for (i = 0; i < data_len;)
1839                 {
1840                 proto_len = data[i];
1841                 i++;
1842
1843                 if (proto_len == 0)
1844                         goto parse_error;
1845
1846                 if (i + proto_len < i || i + proto_len > data_len)
1847                         goto parse_error;
1848
1849                 i += proto_len;
1850                 }
1851
1852         r = s->ctx->alpn_select_cb(s, &selected, &selected_len, data, data_len,
1853                                    s->ctx->alpn_select_cb_arg);
1854         if (r == SSL_TLSEXT_ERR_OK) {
1855                 if (s->s3->alpn_selected)
1856                         OPENSSL_free(s->s3->alpn_selected);
1857                 s->s3->alpn_selected = OPENSSL_malloc(selected_len);
1858                 if (!s->s3->alpn_selected)
1859                         {
1860                         *al = SSL_AD_INTERNAL_ERROR;
1861                         return -1;
1862                         }
1863                 memcpy(s->s3->alpn_selected, selected, selected_len);
1864                 s->s3->alpn_selected_len = selected_len;
1865         }
1866         return 0;
1867
1868 parse_error:
1869         *al = SSL_AD_DECODE_ERROR;
1870         return -1;
1871         }
1872
1873 #ifndef OPENSSL_NO_EC
1874 /*-
1875  * ssl_check_for_safari attempts to fingerprint Safari using OS X
1876  * SecureTransport using the TLS extension block in |d|, of length |n|.
1877  * Safari, since 10.6, sends exactly these extensions, in this order:
1878  *   SNI,
1879  *   elliptic_curves
1880  *   ec_point_formats
1881  *
1882  * We wish to fingerprint Safari because they broke ECDHE-ECDSA support in 10.8,
1883  * but they advertise support. So enabling ECDHE-ECDSA ciphers breaks them.
1884  * Sadly we cannot differentiate 10.6, 10.7 and 10.8.4 (which work), from
1885  * 10.8..10.8.3 (which don't work).
1886  */
1887 static void ssl_check_for_safari(SSL *s, const unsigned char *data, const unsigned char *d, int n) {
1888         unsigned short type, size;
1889         static const unsigned char kSafariExtensionsBlock[] = {
1890                 0x00, 0x0a,  /* elliptic_curves extension */
1891                 0x00, 0x08,  /* 8 bytes */
1892                 0x00, 0x06,  /* 6 bytes of curve ids */
1893                 0x00, 0x17,  /* P-256 */
1894                 0x00, 0x18,  /* P-384 */
1895                 0x00, 0x19,  /* P-521 */
1896
1897                 0x00, 0x0b,  /* ec_point_formats */
1898                 0x00, 0x02,  /* 2 bytes */
1899                 0x01,        /* 1 point format */
1900                 0x00,        /* uncompressed */
1901         };
1902
1903         /* The following is only present in TLS 1.2 */
1904         static const unsigned char kSafariTLS12ExtensionsBlock[] = {
1905                 0x00, 0x0d,  /* signature_algorithms */
1906                 0x00, 0x0c,  /* 12 bytes */
1907                 0x00, 0x0a,  /* 10 bytes */
1908                 0x05, 0x01,  /* SHA-384/RSA */
1909                 0x04, 0x01,  /* SHA-256/RSA */
1910                 0x02, 0x01,  /* SHA-1/RSA */
1911                 0x04, 0x03,  /* SHA-256/ECDSA */
1912                 0x02, 0x03,  /* SHA-1/ECDSA */
1913         };
1914
1915         if (data >= (d+n-2))
1916                 return;
1917         data += 2;
1918
1919         if (data > (d+n-4))
1920                 return;
1921         n2s(data,type);
1922         n2s(data,size);
1923
1924         if (type != TLSEXT_TYPE_server_name)
1925                 return;
1926
1927         if (data+size > d+n)
1928                 return;
1929         data += size;
1930
1931         if (TLS1_get_client_version(s) >= TLS1_2_VERSION)
1932                 {
1933                 const size_t len1 = sizeof(kSafariExtensionsBlock);
1934                 const size_t len2 = sizeof(kSafariTLS12ExtensionsBlock);
1935
1936                 if (data + len1 + len2 != d+n)
1937                         return;
1938                 if (memcmp(data, kSafariExtensionsBlock, len1) != 0)
1939                         return;
1940                 if (memcmp(data + len1, kSafariTLS12ExtensionsBlock, len2) != 0)
1941                         return;
1942                 }
1943         else
1944                 {
1945                 const size_t len = sizeof(kSafariExtensionsBlock);
1946
1947                 if (data + len != d+n)
1948                         return;
1949                 if (memcmp(data, kSafariExtensionsBlock, len) != 0)
1950                         return;
1951                 }
1952
1953         s->s3->is_probably_safari = 1;
1954 }
1955 #endif /* !OPENSSL_NO_EC */
1956
1957
1958 static int ssl_scan_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al)
1959         {
1960         unsigned short type;
1961         unsigned short size;
1962         unsigned short len;
1963         unsigned char *data = *p;
1964         int renegotiate_seen = 0;
1965
1966         s->servername_done = 0;
1967         s->tlsext_status_type = -1;
1968 #ifndef OPENSSL_NO_NEXTPROTONEG
1969         s->s3->next_proto_neg_seen = 0;
1970 #endif
1971
1972         if (s->s3->alpn_selected)
1973                 {
1974                 OPENSSL_free(s->s3->alpn_selected);
1975                 s->s3->alpn_selected = NULL;
1976                 }
1977
1978 #ifndef OPENSSL_NO_HEARTBEATS
1979         s->tlsext_heartbeat &= ~(SSL_TLSEXT_HB_ENABLED |
1980                                SSL_TLSEXT_HB_DONT_SEND_REQUESTS);
1981 #endif
1982
1983 #ifndef OPENSSL_NO_EC
1984         if (s->options & SSL_OP_SAFARI_ECDHE_ECDSA_BUG)
1985                 ssl_check_for_safari(s, data, d, n);
1986 #endif /* !OPENSSL_NO_EC */
1987
1988         /* Clear any signature algorithms extension received */
1989         if (s->cert->peer_sigalgs)
1990                 {
1991                 OPENSSL_free(s->cert->peer_sigalgs);
1992                 s->cert->peer_sigalgs = NULL;
1993                 }
1994
1995 #ifdef TLSEXT_TYPE_encrypt_then_mac
1996         s->s3->flags &= ~TLS1_FLAGS_ENCRYPT_THEN_MAC;
1997 #endif
1998
1999         if (data >= (d+n-2))
2000                 goto ri_check;
2001         n2s(data,len);
2002
2003         if (data > (d+n-len))
2004                 goto ri_check;
2005
2006         while (data <= (d+n-4))
2007                 {
2008                 n2s(data,type);
2009                 n2s(data,size);
2010
2011                 if (data+size > (d+n))
2012                         goto ri_check;
2013 #if 0
2014                 fprintf(stderr,"Received extension type %d size %d\n",type,size);
2015 #endif
2016                 if (s->tlsext_debug_cb)
2017                         s->tlsext_debug_cb(s, 0, type, data, size,
2018                                                 s->tlsext_debug_arg);
2019                 if (type == TLSEXT_TYPE_renegotiate)
2020                         {
2021                         if(!ssl_parse_clienthello_renegotiate_ext(s, data, size, al))
2022                                 return 0;
2023                         renegotiate_seen = 1;
2024                         }
2025                 else if (s->version == SSL3_VERSION)
2026                         {}
2027 /*-
2028  * The servername extension is treated as follows:
2029  *
2030  * - Only the hostname type is supported with a maximum length of 255.
2031  * - The servername is rejected if too long or if it contains zeros,
2032  *   in which case an fatal alert is generated.
2033  * - The servername field is maintained together with the session cache.
2034  * - When a session is resumed, the servername call back invoked in order
2035  *   to allow the application to position itself to the right context.
2036  * - The servername is acknowledged if it is new for a session or when
2037  *   it is identical to a previously used for the same session.
2038  *   Applications can control the behaviour.  They can at any time
2039  *   set a 'desirable' servername for a new SSL object. This can be the
2040  *   case for example with HTTPS when a Host: header field is received and
2041  *   a renegotiation is requested. In this case, a possible servername
2042  *   presented in the new client hello is only acknowledged if it matches
2043  *   the value of the Host: field.
2044  * - Applications must  use SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
2045  *   if they provide for changing an explicit servername context for the
2046  *   session, i.e. when the session has been established with a servername
2047  *   extension.
2048  * - On session reconnect, the servername extension may be absent.
2049  *
2050  */
2051
2052                 else if (type == TLSEXT_TYPE_server_name)
2053                         {
2054                         unsigned char *sdata;
2055                         int servname_type;
2056                         int dsize;
2057
2058                         if (size < 2)
2059                                 {
2060                                 *al = SSL_AD_DECODE_ERROR;
2061                                 return 0;
2062                                 }
2063                         n2s(data,dsize);
2064                         size -= 2;
2065                         if (dsize > size  )
2066                                 {
2067                                 *al = SSL_AD_DECODE_ERROR;
2068                                 return 0;
2069                                 }
2070
2071                         sdata = data;
2072                         while (dsize > 3)
2073                                 {
2074                                 servname_type = *(sdata++);
2075                                 n2s(sdata,len);
2076                                 dsize -= 3;
2077
2078                                 if (len > dsize)
2079                                         {
2080                                         *al = SSL_AD_DECODE_ERROR;
2081                                         return 0;
2082                                         }
2083                                 if (s->servername_done == 0)
2084                                 switch (servname_type)
2085                                         {
2086                                 case TLSEXT_NAMETYPE_host_name:
2087                                         if (!s->hit)
2088                                                 {
2089                                                 if(s->session->tlsext_hostname)
2090                                                         {
2091                                                         *al = SSL_AD_DECODE_ERROR;
2092                                                         return 0;
2093                                                         }
2094                                                 if (len > TLSEXT_MAXLEN_host_name)
2095                                                         {
2096                                                         *al = TLS1_AD_UNRECOGNIZED_NAME;
2097                                                         return 0;
2098                                                         }
2099                                                 if ((s->session->tlsext_hostname = OPENSSL_malloc(len+1)) == NULL)
2100                                                         {
2101                                                         *al = TLS1_AD_INTERNAL_ERROR;
2102                                                         return 0;
2103                                                         }
2104                                                 memcpy(s->session->tlsext_hostname, sdata, len);
2105                                                 s->session->tlsext_hostname[len]='\0';
2106                                                 if (strlen(s->session->tlsext_hostname) != len) {
2107                                                         OPENSSL_free(s->session->tlsext_hostname);
2108                                                         s->session->tlsext_hostname = NULL;
2109                                                         *al = TLS1_AD_UNRECOGNIZED_NAME;
2110                                                         return 0;
2111                                                 }
2112                                                 s->servername_done = 1;
2113
2114                                                 }
2115                                         else
2116                                                 s->servername_done = s->session->tlsext_hostname
2117                                                         && strlen(s->session->tlsext_hostname) == len
2118                                                         && strncmp(s->session->tlsext_hostname, (char *)sdata, len) == 0;
2119
2120                                         break;
2121
2122                                 default:
2123                                         break;
2124                                         }
2125
2126                                 dsize -= len;
2127                                 }
2128                         if (dsize != 0)
2129                                 {
2130                                 *al = SSL_AD_DECODE_ERROR;
2131                                 return 0;
2132                                 }
2133
2134                         }
2135 #ifndef OPENSSL_NO_SRP
2136                 else if (type == TLSEXT_TYPE_srp)
2137                         {
2138                         if (size <= 0 || ((len = data[0])) != (size -1))
2139                                 {
2140                                 *al = SSL_AD_DECODE_ERROR;
2141                                 return 0;
2142                                 }
2143                         if (s->srp_ctx.login != NULL)
2144                                 {
2145                                 *al = SSL_AD_DECODE_ERROR;
2146                                 return 0;
2147                                 }
2148                         if ((s->srp_ctx.login = OPENSSL_malloc(len+1)) == NULL)
2149                                 return -1;
2150                         memcpy(s->srp_ctx.login, &data[1], len);
2151                         s->srp_ctx.login[len]='\0';
2152
2153                         if (strlen(s->srp_ctx.login) != len)
2154                                 {
2155                                 *al = SSL_AD_DECODE_ERROR;
2156                                 return 0;
2157                                 }
2158                         }
2159 #endif
2160
2161 #ifndef OPENSSL_NO_EC
2162                 else if (type == TLSEXT_TYPE_ec_point_formats)
2163                         {
2164                         unsigned char *sdata = data;
2165                         int ecpointformatlist_length = *(sdata++);
2166
2167                         if (ecpointformatlist_length != size - 1 ||
2168                                 ecpointformatlist_length < 1)
2169                                 {
2170                                 *al = TLS1_AD_DECODE_ERROR;
2171                                 return 0;
2172                                 }
2173                         if (!s->hit)
2174                                 {
2175                                 if(s->session->tlsext_ecpointformatlist)
2176                                         {
2177                                         OPENSSL_free(s->session->tlsext_ecpointformatlist);
2178                                         s->session->tlsext_ecpointformatlist = NULL;
2179                                         }
2180                                 s->session->tlsext_ecpointformatlist_length = 0;
2181                                 if ((s->session->tlsext_ecpointformatlist = OPENSSL_malloc(ecpointformatlist_length)) == NULL)
2182                                         {
2183                                         *al = TLS1_AD_INTERNAL_ERROR;
2184                                         return 0;
2185                                         }
2186                                 s->session->tlsext_ecpointformatlist_length = ecpointformatlist_length;
2187                                 memcpy(s->session->tlsext_ecpointformatlist, sdata, ecpointformatlist_length);
2188                                 }
2189 #if 0
2190                         fprintf(stderr,"ssl_parse_clienthello_tlsext s->session->tlsext_ecpointformatlist (length=%i) ", s->session->tlsext_ecpointformatlist_length);
2191                         sdata = s->session->tlsext_ecpointformatlist;
2192                         for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
2193                                 fprintf(stderr,"%i ",*(sdata++));
2194                         fprintf(stderr,"\n");
2195 #endif
2196                         }
2197                 else if (type == TLSEXT_TYPE_elliptic_curves)
2198                         {
2199                         unsigned char *sdata = data;
2200                         int ellipticcurvelist_length = (*(sdata++) << 8);
2201                         ellipticcurvelist_length += (*(sdata++));
2202
2203                         if (ellipticcurvelist_length != size - 2 ||
2204                                 ellipticcurvelist_length < 1 ||
2205                                 /* Each NamedCurve is 2 bytes. */
2206                                 ellipticcurvelist_length & 1)
2207                                 {
2208                                 *al = TLS1_AD_DECODE_ERROR;
2209                                 return 0;
2210                                 }
2211                         if (!s->hit)
2212                                 {
2213                                 if(s->session->tlsext_ellipticcurvelist)
2214                                         {
2215                                         *al = TLS1_AD_DECODE_ERROR;
2216                                         return 0;
2217                                         }
2218                                 s->session->tlsext_ellipticcurvelist_length = 0;
2219                                 if ((s->session->tlsext_ellipticcurvelist = OPENSSL_malloc(ellipticcurvelist_length)) == NULL)
2220                                         {
2221                                         *al = TLS1_AD_INTERNAL_ERROR;
2222                                         return 0;
2223                                         }
2224                                 s->session->tlsext_ellipticcurvelist_length = ellipticcurvelist_length;
2225                                 memcpy(s->session->tlsext_ellipticcurvelist, sdata, ellipticcurvelist_length);
2226                                 }
2227 #if 0
2228                         fprintf(stderr,"ssl_parse_clienthello_tlsext s->session->tlsext_ellipticcurvelist (length=%i) ", s->session->tlsext_ellipticcurvelist_length);
2229                         sdata = s->session->tlsext_ellipticcurvelist;
2230                         for (i = 0; i < s->session->tlsext_ellipticcurvelist_length; i++)
2231                                 fprintf(stderr,"%i ",*(sdata++));
2232                         fprintf(stderr,"\n");
2233 #endif
2234                         }
2235 #endif /* OPENSSL_NO_EC */
2236 #ifdef TLSEXT_TYPE_opaque_prf_input
2237                 else if (type == TLSEXT_TYPE_opaque_prf_input)
2238                         {
2239                         unsigned char *sdata = data;
2240
2241                         if (size < 2)
2242                                 {
2243                                 *al = SSL_AD_DECODE_ERROR;
2244                                 return 0;
2245                                 }
2246                         n2s(sdata, s->s3->client_opaque_prf_input_len);
2247                         if (s->s3->client_opaque_prf_input_len != size - 2)
2248                                 {
2249                                 *al = SSL_AD_DECODE_ERROR;
2250                                 return 0;
2251                                 }
2252
2253                         if (s->s3->client_opaque_prf_input != NULL) /* shouldn't really happen */
2254                                 OPENSSL_free(s->s3->client_opaque_prf_input);
2255                         if (s->s3->client_opaque_prf_input_len == 0)
2256                                 s->s3->client_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
2257                         else
2258                                 s->s3->client_opaque_prf_input = BUF_memdup(sdata, s->s3->client_opaque_prf_input_len);
2259                         if (s->s3->client_opaque_prf_input == NULL)
2260                                 {
2261                                 *al = TLS1_AD_INTERNAL_ERROR;
2262                                 return 0;
2263                                 }
2264                         }
2265 #endif
2266                 else if (type == TLSEXT_TYPE_session_ticket)
2267                         {
2268                         if (s->tls_session_ticket_ext_cb &&
2269                             !s->tls_session_ticket_ext_cb(s, data, size, s->tls_session_ticket_ext_cb_arg))
2270                                 {
2271                                 *al = TLS1_AD_INTERNAL_ERROR;
2272                                 return 0;
2273                                 }
2274                         }
2275                 else if (type == TLSEXT_TYPE_signature_algorithms)
2276                         {
2277                         int dsize;
2278                         if (s->cert->peer_sigalgs || size < 2)
2279                                 {
2280                                 *al = SSL_AD_DECODE_ERROR;
2281                                 return 0;
2282                                 }
2283                         n2s(data,dsize);
2284                         size -= 2;
2285                         if (dsize != size || dsize & 1 || !dsize)
2286                                 {
2287                                 *al = SSL_AD_DECODE_ERROR;
2288                                 return 0;
2289                                 }
2290                         if (!tls1_save_sigalgs(s, data, dsize))
2291                                 {
2292                                 *al = SSL_AD_DECODE_ERROR;
2293                                 return 0;
2294                                 }
2295                         }
2296                 else if (type == TLSEXT_TYPE_status_request)
2297                         {
2298
2299                         if (size < 5)
2300                                 {
2301                                 *al = SSL_AD_DECODE_ERROR;
2302                                 return 0;
2303                                 }
2304
2305                         s->tlsext_status_type = *data++;
2306                         size--;
2307                         if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp)
2308                                 {
2309                                 const unsigned char *sdata;
2310                                 int dsize;
2311                                 /* Read in responder_id_list */
2312                                 n2s(data,dsize);
2313                                 size -= 2;
2314                                 if (dsize > size  )
2315                                         {
2316                                         *al = SSL_AD_DECODE_ERROR;
2317                                         return 0;
2318                                         }
2319                                 while (dsize > 0)
2320                                         {
2321                                         OCSP_RESPID *id;
2322                                         int idsize;
2323                                         if (dsize < 4)
2324                                                 {
2325                                                 *al = SSL_AD_DECODE_ERROR;
2326                                                 return 0;
2327                                                 }
2328                                         n2s(data, idsize);
2329                                         dsize -= 2 + idsize;
2330                                         size -= 2 + idsize;
2331                                         if (dsize < 0)
2332                                                 {
2333                                                 *al = SSL_AD_DECODE_ERROR;
2334                                                 return 0;
2335                                                 }
2336                                         sdata = data;
2337                                         data += idsize;
2338                                         id = d2i_OCSP_RESPID(NULL,
2339                                                                 &sdata, idsize);
2340                                         if (!id)
2341                                                 {
2342                                                 *al = SSL_AD_DECODE_ERROR;
2343                                                 return 0;
2344                                                 }
2345                                         if (data != sdata)
2346                                                 {
2347                                                 OCSP_RESPID_free(id);
2348                                                 *al = SSL_AD_DECODE_ERROR;
2349                                                 return 0;
2350                                                 }
2351                                         if (!s->tlsext_ocsp_ids
2352                                                 && !(s->tlsext_ocsp_ids =
2353                                                 sk_OCSP_RESPID_new_null()))
2354                                                 {
2355                                                 OCSP_RESPID_free(id);
2356                                                 *al = SSL_AD_INTERNAL_ERROR;
2357                                                 return 0;
2358                                                 }
2359                                         if (!sk_OCSP_RESPID_push(
2360                                                         s->tlsext_ocsp_ids, id))
2361                                                 {
2362                                                 OCSP_RESPID_free(id);
2363                                                 *al = SSL_AD_INTERNAL_ERROR;
2364                                                 return 0;
2365                                                 }
2366                                         }
2367
2368                                 /* Read in request_extensions */
2369                                 if (size < 2)
2370                                         {
2371                                         *al = SSL_AD_DECODE_ERROR;
2372                                         return 0;
2373                                         }
2374                                 n2s(data,dsize);
2375                                 size -= 2;
2376                                 if (dsize != size)
2377                                         {
2378                                         *al = SSL_AD_DECODE_ERROR;
2379                                         return 0;
2380                                         }
2381                                 sdata = data;
2382                                 if (dsize > 0)
2383                                         {
2384                                         if (s->tlsext_ocsp_exts)
2385                                                 {
2386                                                 sk_X509_EXTENSION_pop_free(s->tlsext_ocsp_exts,
2387                                                                            X509_EXTENSION_free);
2388                                                 }
2389
2390                                         s->tlsext_ocsp_exts =
2391                                                 d2i_X509_EXTENSIONS(NULL,
2392                                                         &sdata, dsize);
2393                                         if (!s->tlsext_ocsp_exts
2394                                                 || (data + dsize != sdata))
2395                                                 {
2396                                                 *al = SSL_AD_DECODE_ERROR;
2397                                                 return 0;
2398                                                 }
2399                                         }
2400                                 }
2401                                 /* We don't know what to do with any other type
2402                                 * so ignore it.
2403                                 */
2404                                 else
2405                                         s->tlsext_status_type = -1;
2406                         }
2407 #ifndef OPENSSL_NO_HEARTBEATS
2408                 else if (type == TLSEXT_TYPE_heartbeat)
2409                         {
2410                         switch(data[0])
2411                                 {
2412                                 case 0x01:      /* Client allows us to send HB requests */
2413                                                         s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED;
2414                                                         break;
2415                                 case 0x02:      /* Client doesn't accept HB requests */
2416                                                         s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED;
2417                                                         s->tlsext_heartbeat |= SSL_TLSEXT_HB_DONT_SEND_REQUESTS;
2418                                                         break;
2419                                 default:        *al = SSL_AD_ILLEGAL_PARAMETER;
2420                                                         return 0;
2421                                 }
2422                         }
2423 #endif
2424 #ifndef OPENSSL_NO_NEXTPROTONEG
2425                 else if (type == TLSEXT_TYPE_next_proto_neg &&
2426                          s->s3->tmp.finish_md_len == 0 &&
2427                          s->s3->alpn_selected == NULL)
2428                         {
2429                         /*-
2430                          * We shouldn't accept this extension on a
2431                          * renegotiation.
2432                          *
2433                          * s->new_session will be set on renegotiation, but we
2434                          * probably shouldn't rely that it couldn't be set on
2435                          * the initial renegotation too in certain cases (when
2436                          * there's some other reason to disallow resuming an
2437                          * earlier session -- the current code won't be doing
2438                          * anything like that, but this might change).
2439                          *
2440                          * A valid sign that there's been a previous handshake
2441                          * in this connection is if s->s3->tmp.finish_md_len >
2442                          * 0.  (We are talking about a check that will happen
2443                          * in the Hello protocol round, well before a new
2444                          * Finished message could have been computed.)
2445                          */
2446                         s->s3->next_proto_neg_seen = 1;
2447                         }
2448 #endif
2449
2450                 else if (type == TLSEXT_TYPE_application_layer_protocol_negotiation &&
2451                          s->ctx->alpn_select_cb &&
2452                          s->s3->tmp.finish_md_len == 0)
2453                         {
2454                         if (tls1_alpn_handle_client_hello(s, data, size, al) != 0)
2455                                 return 0;
2456 #ifndef OPENSSL_NO_NEXTPROTONEG
2457                         /* ALPN takes precedence over NPN. */
2458                         s->s3->next_proto_neg_seen = 0;
2459 #endif
2460                         }
2461
2462                 /* session ticket processed earlier */
2463                 else if (SSL_IS_DTLS(s) && SSL_get_srtp_profiles(s)
2464                                 && type == TLSEXT_TYPE_use_srtp)
2465                         {
2466                         if(ssl_parse_clienthello_use_srtp_ext(s, data, size,
2467                                                               al))
2468                                 return 0;
2469                         }
2470 #ifdef TLSEXT_TYPE_encrypt_then_mac
2471                 else if (type == TLSEXT_TYPE_encrypt_then_mac)
2472                         s->s3->flags |= TLS1_FLAGS_ENCRYPT_THEN_MAC;
2473 #endif
2474                 /* If this ClientHello extension was unhandled and this is
2475                  * a nonresumed connection, check whether the extension is a
2476                  * custom TLS Extension (has a custom_srv_ext_record), and if
2477                  * so call the callback and record the extension number so that
2478                  * an appropriate ServerHello may be later returned.
2479                  */
2480                 else if (!s->hit)
2481                         {
2482                         if (custom_ext_parse(s, 1, type, data, size, al) <= 0)
2483                                 return 0;
2484                         }
2485
2486                 data+=size;
2487                 }
2488
2489         *p = data;
2490
2491         ri_check:
2492
2493         /* Need RI if renegotiating */
2494
2495         if (!renegotiate_seen && s->renegotiate &&
2496                 !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
2497                 {
2498                 *al = SSL_AD_HANDSHAKE_FAILURE;
2499                 SSLerr(SSL_F_SSL_SCAN_CLIENTHELLO_TLSEXT,
2500                                 SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
2501                 return 0;
2502                 }
2503
2504         return 1;
2505         }
2506
2507 int ssl_parse_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n)
2508         {
2509         int al = -1;
2510         custom_ext_init(&s->cert->srv_ext);
2511         if (ssl_scan_clienthello_tlsext(s, p, d, n, &al) <= 0)
2512                 {
2513                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2514                 return 0;
2515                 }
2516
2517         if (ssl_check_clienthello_tlsext_early(s) <= 0)
2518                 {
2519                 SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_TLSEXT,SSL_R_CLIENTHELLO_TLSEXT);
2520                 return 0;
2521                 }
2522         return 1;
2523 }
2524
2525 #ifndef OPENSSL_NO_NEXTPROTONEG
2526 /* ssl_next_proto_validate validates a Next Protocol Negotiation block. No
2527  * elements of zero length are allowed and the set of elements must exactly fill
2528  * the length of the block. */
2529 static char ssl_next_proto_validate(unsigned char *d, unsigned len)
2530         {
2531         unsigned int off = 0;
2532
2533         while (off < len)
2534                 {
2535                 if (d[off] == 0)
2536                         return 0;
2537                 off += d[off];
2538                 off++;
2539                 }
2540
2541         return off == len;
2542         }
2543 #endif
2544
2545 static int ssl_scan_serverhello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al)
2546         {
2547         unsigned short length;
2548         unsigned short type;
2549         unsigned short size;
2550         unsigned char *data = *p;
2551         int tlsext_servername = 0;
2552         int renegotiate_seen = 0;
2553
2554 #ifndef OPENSSL_NO_NEXTPROTONEG
2555         s->s3->next_proto_neg_seen = 0;
2556 #endif
2557         s->tlsext_ticket_expected = 0;
2558
2559         if (s->s3->alpn_selected)
2560                 {
2561                 OPENSSL_free(s->s3->alpn_selected);
2562                 s->s3->alpn_selected = NULL;
2563                 }
2564
2565 #ifndef OPENSSL_NO_HEARTBEATS
2566         s->tlsext_heartbeat &= ~(SSL_TLSEXT_HB_ENABLED |
2567                                SSL_TLSEXT_HB_DONT_SEND_REQUESTS);
2568 #endif
2569
2570 #ifdef TLSEXT_TYPE_encrypt_then_mac
2571         s->s3->flags &= ~TLS1_FLAGS_ENCRYPT_THEN_MAC;
2572 #endif
2573
2574         if (data >= (d+n-2))
2575                 goto ri_check;
2576
2577         n2s(data,length);
2578         if (data+length != d+n)
2579                 {
2580                 *al = SSL_AD_DECODE_ERROR;
2581                 return 0;
2582                 }
2583
2584         while(data <= (d+n-4))
2585                 {
2586                 n2s(data,type);
2587                 n2s(data,size);
2588
2589                 if (data+size > (d+n))
2590                         goto ri_check;
2591
2592                 if (s->tlsext_debug_cb)
2593                         s->tlsext_debug_cb(s, 1, type, data, size,
2594                                                 s->tlsext_debug_arg);
2595
2596
2597                 if (type == TLSEXT_TYPE_renegotiate)
2598                         {
2599                         if(!ssl_parse_serverhello_renegotiate_ext(s, data, size, al))
2600                                 return 0;
2601                         renegotiate_seen = 1;
2602                         }
2603                 else if (s->version == SSL3_VERSION)
2604                         {}
2605                 else if (type == TLSEXT_TYPE_server_name)
2606                         {
2607                         if (s->tlsext_hostname == NULL || size > 0)
2608                                 {
2609                                 *al = TLS1_AD_UNRECOGNIZED_NAME;
2610                                 return 0;
2611                                 }
2612                         tlsext_servername = 1;
2613                         }
2614
2615 #ifndef OPENSSL_NO_EC
2616                 else if (type == TLSEXT_TYPE_ec_point_formats)
2617                         {
2618                         unsigned char *sdata = data;
2619                         int ecpointformatlist_length = *(sdata++);
2620
2621                         if (ecpointformatlist_length != size - 1)
2622                                 {
2623                                 *al = TLS1_AD_DECODE_ERROR;
2624                                 return 0;
2625                                 }
2626                         if (!s->hit)
2627                                 {
2628                                 s->session->tlsext_ecpointformatlist_length = 0;
2629                                 if (s->session->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->session->tlsext_ecpointformatlist);
2630                                 if ((s->session->tlsext_ecpointformatlist = OPENSSL_malloc(ecpointformatlist_length)) == NULL)
2631                                         {
2632                                         *al = TLS1_AD_INTERNAL_ERROR;
2633                                         return 0;
2634                                         }
2635                                 s->session->tlsext_ecpointformatlist_length = ecpointformatlist_length;
2636                                 memcpy(s->session->tlsext_ecpointformatlist, sdata, ecpointformatlist_length);
2637                                 }
2638 #if 0
2639                         fprintf(stderr,"ssl_parse_serverhello_tlsext s->session->tlsext_ecpointformatlist ");
2640                         sdata = s->session->tlsext_ecpointformatlist;
2641                         for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
2642                                 fprintf(stderr,"%i ",*(sdata++));
2643                         fprintf(stderr,"\n");
2644 #endif
2645                         }
2646 #endif /* OPENSSL_NO_EC */
2647
2648                 else if (type == TLSEXT_TYPE_session_ticket)
2649                         {
2650                         if (s->tls_session_ticket_ext_cb &&
2651                             !s->tls_session_ticket_ext_cb(s, data, size, s->tls_session_ticket_ext_cb_arg))
2652                                 {
2653                                 *al = TLS1_AD_INTERNAL_ERROR;
2654                                 return 0;
2655                                 }
2656                         if (!tls_use_ticket(s) || (size > 0))
2657                                 {
2658                                 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
2659                                 return 0;
2660                                 }
2661                         s->tlsext_ticket_expected = 1;
2662                         }
2663 #ifdef TLSEXT_TYPE_opaque_prf_input
2664                 else if (type == TLSEXT_TYPE_opaque_prf_input)
2665                         {
2666                         unsigned char *sdata = data;
2667
2668                         if (size < 2)
2669                                 {
2670                                 *al = SSL_AD_DECODE_ERROR;
2671                                 return 0;
2672                                 }
2673                         n2s(sdata, s->s3->server_opaque_prf_input_len);
2674                         if (s->s3->server_opaque_prf_input_len != size - 2)
2675                                 {
2676                                 *al = SSL_AD_DECODE_ERROR;
2677                                 return 0;
2678                                 }
2679
2680                         if (s->s3->server_opaque_prf_input != NULL) /* shouldn't really happen */
2681                                 OPENSSL_free(s->s3->server_opaque_prf_input);
2682                         if (s->s3->server_opaque_prf_input_len == 0)
2683                                 s->s3->server_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
2684                         else
2685                                 s->s3->server_opaque_prf_input = BUF_memdup(sdata, s->s3->server_opaque_prf_input_len);
2686
2687                         if (s->s3->server_opaque_prf_input == NULL)
2688                                 {
2689                                 *al = TLS1_AD_INTERNAL_ERROR;
2690                                 return 0;
2691                                 }
2692                         }
2693 #endif
2694                 else if (type == TLSEXT_TYPE_status_request)
2695                         {
2696                         /* MUST be empty and only sent if we've requested
2697                          * a status request message.
2698                          */
2699                         if ((s->tlsext_status_type == -1) || (size > 0))
2700                                 {
2701                                 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
2702                                 return 0;
2703                                 }
2704                         /* Set flag to expect CertificateStatus message */
2705                         s->tlsext_status_expected = 1;
2706                         }
2707 #ifndef OPENSSL_NO_NEXTPROTONEG
2708                 else if (type == TLSEXT_TYPE_next_proto_neg &&
2709                          s->s3->tmp.finish_md_len == 0)
2710                         {
2711                         unsigned char *selected;
2712                         unsigned char selected_len;
2713
2714                         /* We must have requested it. */
2715                         if (s->ctx->next_proto_select_cb == NULL)
2716                                 {
2717                                 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
2718                                 return 0;
2719                                 }
2720                         /* The data must be valid */
2721                         if (!ssl_next_proto_validate(data, size))
2722                                 {
2723                                 *al = TLS1_AD_DECODE_ERROR;
2724                                 return 0;
2725                                 }
2726                         if (s->ctx->next_proto_select_cb(s, &selected, &selected_len, data, size, s->ctx->next_proto_select_cb_arg) != SSL_TLSEXT_ERR_OK)
2727                                 {
2728                                 *al = TLS1_AD_INTERNAL_ERROR;
2729                                 return 0;
2730                                 }
2731                         s->next_proto_negotiated = OPENSSL_malloc(selected_len);
2732                         if (!s->next_proto_negotiated)
2733                                 {
2734                                 *al = TLS1_AD_INTERNAL_ERROR;
2735                                 return 0;
2736                                 }
2737                         memcpy(s->next_proto_negotiated, selected, selected_len);
2738                         s->next_proto_negotiated_len = selected_len;
2739                         s->s3->next_proto_neg_seen = 1;
2740                         }
2741 #endif
2742
2743                 else if (type == TLSEXT_TYPE_application_layer_protocol_negotiation)
2744                         {
2745                         unsigned len;
2746
2747                         /* We must have requested it. */
2748                         if (s->alpn_client_proto_list == NULL)
2749                                 {
2750                                 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
2751                                 return 0;
2752                                 }
2753                         if (size < 4)
2754                                 {
2755                                 *al = TLS1_AD_DECODE_ERROR;
2756                                 return 0;
2757                                 }
2758                         /*-
2759                          * The extension data consists of:
2760                          *   uint16 list_length
2761                          *   uint8 proto_length;
2762                          *   uint8 proto[proto_length];
2763                          */
2764                         len = data[0];
2765                         len <<= 8;
2766                         len |= data[1];
2767                         if (len != (unsigned) size - 2)
2768                                 {
2769                                 *al = TLS1_AD_DECODE_ERROR;
2770                                 return 0;
2771                                 }
2772                         len = data[2];
2773                         if (len != (unsigned) size - 3)
2774                                 {
2775                                 *al = TLS1_AD_DECODE_ERROR;
2776                                 return 0;
2777                                 }
2778                         if (s->s3->alpn_selected)
2779                                 OPENSSL_free(s->s3->alpn_selected);
2780                         s->s3->alpn_selected = OPENSSL_malloc(len);
2781                         if (!s->s3->alpn_selected)
2782                                 {
2783                                 *al = TLS1_AD_INTERNAL_ERROR;
2784                                 return 0;
2785                                 }
2786                         memcpy(s->s3->alpn_selected, data + 3, len);
2787                         s->s3->alpn_selected_len = len;
2788                         }
2789 #ifndef OPENSSL_NO_HEARTBEATS
2790                 else if (type == TLSEXT_TYPE_heartbeat)
2791                         {
2792                         switch(data[0])
2793                                 {
2794                                 case 0x01:      /* Server allows us to send HB requests */
2795                                                         s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED;
2796                                                         break;
2797                                 case 0x02:      /* Server doesn't accept HB requests */
2798                                                         s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED;
2799                                                         s->tlsext_heartbeat |= SSL_TLSEXT_HB_DONT_SEND_REQUESTS;
2800                                                         break;
2801                                 default:        *al = SSL_AD_ILLEGAL_PARAMETER;
2802                                                         return 0;
2803                                 }
2804                         }
2805 #endif
2806                 else if (SSL_IS_DTLS(s) && type == TLSEXT_TYPE_use_srtp)
2807                         {
2808                         if(ssl_parse_serverhello_use_srtp_ext(s, data, size,
2809                                                               al))
2810                                 return 0;
2811                         }
2812 #ifdef TLSEXT_TYPE_encrypt_then_mac
2813                 else if (type == TLSEXT_TYPE_encrypt_then_mac)
2814                         {
2815                         /* Ignore if inappropriate ciphersuite */
2816                         if (s->s3->tmp.new_cipher->algorithm_mac != SSL_AEAD
2817                             && s->s3->tmp.new_cipher->algorithm_enc != SSL_RC4)
2818                                 s->s3->flags |= TLS1_FLAGS_ENCRYPT_THEN_MAC;
2819                         }
2820 #endif
2821                 /* If this extension type was not otherwise handled, but
2822                  * matches a custom_cli_ext_record, then send it to the c
2823                  * callback */
2824                 else if (custom_ext_parse(s, 0, type, data, size, al) <= 0)
2825                                 return 0;
2826
2827                 data += size;
2828                 }
2829
2830         if (data != d+n)
2831                 {
2832                 *al = SSL_AD_DECODE_ERROR;
2833                 return 0;
2834                 }
2835
2836         if (!s->hit && tlsext_servername == 1)
2837                 {
2838                 if (s->tlsext_hostname)
2839                         {
2840                         if (s->session->tlsext_hostname == NULL)
2841                                 {
2842                                 s->session->tlsext_hostname = BUF_strdup(s->tlsext_hostname);
2843                                 if (!s->session->tlsext_hostname)
2844                                         {
2845                                         *al = SSL_AD_UNRECOGNIZED_NAME;
2846                                         return 0;
2847                                         }
2848                                 }
2849                         else
2850                                 {
2851                                 *al = SSL_AD_DECODE_ERROR;
2852                                 return 0;
2853                                 }
2854                         }
2855                 }
2856
2857         *p = data;
2858
2859         ri_check:
2860
2861         /* Determine if we need to see RI. Strictly speaking if we want to
2862          * avoid an attack we should *always* see RI even on initial server
2863          * hello because the client doesn't see any renegotiation during an
2864          * attack. However this would mean we could not connect to any server
2865          * which doesn't support RI so for the immediate future tolerate RI
2866          * absence on initial connect only.
2867          */
2868         if (!renegotiate_seen
2869                 && !(s->options & SSL_OP_LEGACY_SERVER_CONNECT)
2870                 && !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
2871                 {
2872                 *al = SSL_AD_HANDSHAKE_FAILURE;
2873                 SSLerr(SSL_F_SSL_SCAN_SERVERHELLO_TLSEXT,
2874                                 SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
2875                 return 0;
2876                 }
2877
2878         return 1;
2879         }
2880
2881
2882 int ssl_prepare_clienthello_tlsext(SSL *s)
2883         {
2884
2885 #ifdef TLSEXT_TYPE_opaque_prf_input
2886         {
2887                 int r = 1;
2888
2889                 if (s->ctx->tlsext_opaque_prf_input_callback != 0)
2890                         {
2891                         r = s->ctx->tlsext_opaque_prf_input_callback(s, NULL, 0, s->ctx->tlsext_opaque_prf_input_callback_arg);
2892                         if (!r)
2893                                 return -1;
2894                         }
2895
2896                 if (s->tlsext_opaque_prf_input != NULL)
2897                         {
2898                         if (s->s3->client_opaque_prf_input != NULL) /* shouldn't really happen */
2899                                 OPENSSL_free(s->s3->client_opaque_prf_input);
2900
2901                         if (s->tlsext_opaque_prf_input_len == 0)
2902                                 s->s3->client_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
2903                         else
2904                                 s->s3->client_opaque_prf_input = BUF_memdup(s->tlsext_opaque_prf_input, s->tlsext_opaque_prf_input_len);
2905                         if (s->s3->client_opaque_prf_input == NULL)
2906                                 {
2907                                 SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
2908                                 return -1;
2909                                 }
2910                         s->s3->client_opaque_prf_input_len = s->tlsext_opaque_prf_input_len;
2911                         }
2912
2913                 if (r == 2)
2914                         /* at callback's request, insist on receiving an appropriate server opaque PRF input */
2915                         s->s3->server_opaque_prf_input_len = s->tlsext_opaque_prf_input_len;
2916         }
2917 #endif
2918
2919         return 1;
2920         }
2921
2922 int ssl_prepare_serverhello_tlsext(SSL *s)
2923         {
2924         return 1;
2925         }
2926
2927 static int ssl_check_clienthello_tlsext_early(SSL *s)
2928         {
2929         int ret=SSL_TLSEXT_ERR_NOACK;
2930         int al = SSL_AD_UNRECOGNIZED_NAME;
2931
2932 #ifndef OPENSSL_NO_EC
2933         /* The handling of the ECPointFormats extension is done elsewhere, namely in
2934          * ssl3_choose_cipher in s3_lib.c.
2935          */
2936         /* The handling of the EllipticCurves extension is done elsewhere, namely in
2937          * ssl3_choose_cipher in s3_lib.c.
2938          */
2939 #endif
2940
2941         if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0)
2942                 ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg);
2943         else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0)
2944                 ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg);
2945
2946 #ifdef TLSEXT_TYPE_opaque_prf_input
2947         {
2948                 /* This sort of belongs into ssl_prepare_serverhello_tlsext(),
2949                  * but we might be sending an alert in response to the client hello,
2950                  * so this has to happen here in
2951                  * ssl_check_clienthello_tlsext_early(). */
2952
2953                 int r = 1;
2954
2955                 if (s->ctx->tlsext_opaque_prf_input_callback != 0)
2956                         {
2957                         r = s->ctx->tlsext_opaque_prf_input_callback(s, NULL, 0, s->ctx->tlsext_opaque_prf_input_callback_arg);
2958                         if (!r)
2959                                 {
2960                                 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2961                                 al = SSL_AD_INTERNAL_ERROR;
2962                                 goto err;
2963                                 }
2964                         }
2965
2966                 if (s->s3->server_opaque_prf_input != NULL) /* shouldn't really happen */
2967                         OPENSSL_free(s->s3->server_opaque_prf_input);
2968                 s->s3->server_opaque_prf_input = NULL;
2969
2970                 if (s->tlsext_opaque_prf_input != NULL)
2971                         {
2972                         if (s->s3->client_opaque_prf_input != NULL &&
2973                                 s->s3->client_opaque_prf_input_len == s->tlsext_opaque_prf_input_len)
2974                                 {
2975                                 /* can only use this extension if we have a server opaque PRF input
2976                                  * of the same length as the client opaque PRF input! */
2977
2978                                 if (s->tlsext_opaque_prf_input_len == 0)
2979                                         s->s3->server_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
2980                                 else
2981                                         s->s3->server_opaque_prf_input = BUF_memdup(s->tlsext_opaque_prf_input, s->tlsext_opaque_prf_input_len);
2982                                 if (s->s3->server_opaque_prf_input == NULL)
2983                                         {
2984                                         ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2985                                         al = SSL_AD_INTERNAL_ERROR;
2986                                         goto err;
2987                                         }
2988                                 s->s3->server_opaque_prf_input_len = s->tlsext_opaque_prf_input_len;
2989                                 }
2990                         }
2991
2992                 if (r == 2 && s->s3->server_opaque_prf_input == NULL)
2993                         {
2994                         /* The callback wants to enforce use of the extension,
2995                          * but we can't do that with the client opaque PRF input;
2996                          * abort the handshake.
2997                          */
2998                         ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2999                         al = SSL_AD_HANDSHAKE_FAILURE;
3000                         }
3001         }
3002
3003  err:
3004 #endif
3005         switch (ret)
3006                 {
3007                 case SSL_TLSEXT_ERR_ALERT_FATAL:
3008                         ssl3_send_alert(s,SSL3_AL_FATAL,al);
3009                         return -1;
3010
3011                 case SSL_TLSEXT_ERR_ALERT_WARNING:
3012                         ssl3_send_alert(s,SSL3_AL_WARNING,al);
3013                         return 1;
3014
3015                 case SSL_TLSEXT_ERR_NOACK:
3016                         s->servername_done=0;
3017                         default:
3018                 return 1;
3019                 }
3020         }
3021
3022 int tls1_set_server_sigalgs(SSL *s)
3023         {
3024         int al;
3025         size_t i;
3026         /* Clear any shared sigtnature algorithms */
3027         if (s->cert->shared_sigalgs)
3028                 {
3029                 OPENSSL_free(s->cert->shared_sigalgs);
3030                 s->cert->shared_sigalgs = NULL;
3031                 }
3032         /* Clear certificate digests and validity flags */
3033         for (i = 0; i < SSL_PKEY_NUM; i++)
3034                 {
3035                 s->cert->pkeys[i].digest = NULL;
3036                 s->cert->pkeys[i].valid_flags = 0;
3037                 }
3038
3039         /* If sigalgs received process it. */
3040         if (s->cert->peer_sigalgs)
3041                 {
3042                 if (!tls1_process_sigalgs(s))
3043                         {
3044                         SSLerr(SSL_F_TLS1_SET_SERVER_SIGALGS,
3045                                         ERR_R_MALLOC_FAILURE);
3046                         al = SSL_AD_INTERNAL_ERROR;
3047                         goto err;
3048                         }
3049                 /* Fatal error is no shared signature algorithms */
3050                 if (!s->cert->shared_sigalgs)
3051                         {
3052                         SSLerr(SSL_F_TLS1_SET_SERVER_SIGALGS,
3053                                         SSL_R_NO_SHARED_SIGATURE_ALGORITHMS);
3054                         al = SSL_AD_ILLEGAL_PARAMETER;
3055                         goto err;
3056                         }
3057                 }
3058         else
3059                 ssl_cert_set_default_md(s->cert);
3060         return 1;
3061         err:
3062         ssl3_send_alert(s, SSL3_AL_FATAL, al);
3063         return 0;
3064         }
3065
3066 int ssl_check_clienthello_tlsext_late(SSL *s)
3067         {
3068         int ret = SSL_TLSEXT_ERR_OK;
3069         int al;
3070
3071         /* If status request then ask callback what to do.
3072          * Note: this must be called after servername callbacks in case
3073          * the certificate has changed, and must be called after the cipher
3074          * has been chosen because this may influence which certificate is sent
3075          */
3076         if ((s->tlsext_status_type != -1) && s->ctx && s->ctx->tlsext_status_cb)
3077                 {
3078                 int r;
3079                 CERT_PKEY *certpkey;
3080                 certpkey = ssl_get_server_send_pkey(s);
3081                 /* If no certificate can't return certificate status */
3082                 if (certpkey == NULL)
3083                         {
3084                         s->tlsext_status_expected = 0;
3085                         return 1;
3086                         }
3087                 /* Set current certificate to one we will use so
3088                  * SSL_get_certificate et al can pick it up.
3089                  */
3090                 s->cert->key = certpkey;
3091                 r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
3092                 switch (r)
3093                         {
3094                         /* We don't want to send a status request response */
3095                         case SSL_TLSEXT_ERR_NOACK:
3096                                 s->tlsext_status_expected = 0;
3097                                 break;
3098                         /* status request response should be sent */
3099                         case SSL_TLSEXT_ERR_OK:
3100                                 if (s->tlsext_ocsp_resp)
3101                                         s->tlsext_status_expected = 1;
3102                                 else
3103                                         s->tlsext_status_expected = 0;
3104                                 break;
3105                         /* something bad happened */
3106                         case SSL_TLSEXT_ERR_ALERT_FATAL:
3107                                 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
3108                                 al = SSL_AD_INTERNAL_ERROR;
3109                                 goto err;
3110                         }
3111                 }
3112         else
3113                 s->tlsext_status_expected = 0;
3114
3115  err:
3116         switch (ret)
3117                 {
3118                 case SSL_TLSEXT_ERR_ALERT_FATAL:
3119                         ssl3_send_alert(s, SSL3_AL_FATAL, al);
3120                         return -1;
3121
3122                 case SSL_TLSEXT_ERR_ALERT_WARNING:
3123                         ssl3_send_alert(s, SSL3_AL_WARNING, al);
3124                         return 1;
3125
3126                 default:
3127                         return 1;
3128                 }
3129         }
3130
3131 int ssl_check_serverhello_tlsext(SSL *s)
3132         {
3133         int ret=SSL_TLSEXT_ERR_NOACK;
3134         int al = SSL_AD_UNRECOGNIZED_NAME;
3135
3136 #ifndef OPENSSL_NO_EC
3137         /* If we are client and using an elliptic curve cryptography cipher
3138          * suite, then if server returns an EC point formats lists extension
3139          * it must contain uncompressed.
3140          */
3141         unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
3142         unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth;
3143         if ((s->tlsext_ecpointformatlist != NULL) && (s->tlsext_ecpointformatlist_length > 0) &&
3144             (s->session->tlsext_ecpointformatlist != NULL) && (s->session->tlsext_ecpointformatlist_length > 0) &&
3145             ((alg_k & (SSL_kECDHE|SSL_kECDHr|SSL_kECDHe)) || (alg_a & SSL_aECDSA)))
3146                 {
3147                 /* we are using an ECC cipher */
3148                 size_t i;
3149                 unsigned char *list;
3150                 int found_uncompressed = 0;
3151                 list = s->session->tlsext_ecpointformatlist;
3152                 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
3153                         {
3154                         if (*(list++) == TLSEXT_ECPOINTFORMAT_uncompressed)
3155                                 {
3156                                 found_uncompressed = 1;
3157                                 break;
3158                                 }
3159                         }
3160                 if (!found_uncompressed)
3161                         {
3162                         SSLerr(SSL_F_SSL_CHECK_SERVERHELLO_TLSEXT,SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST);
3163                         return -1;
3164                         }
3165                 }
3166         ret = SSL_TLSEXT_ERR_OK;
3167 #endif /* OPENSSL_NO_EC */
3168
3169         if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0)
3170                 ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg);
3171         else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0)
3172                 ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg);
3173
3174 #ifdef TLSEXT_TYPE_opaque_prf_input
3175         if (s->s3->server_opaque_prf_input_len > 0)
3176                 {
3177                 /* This case may indicate that we, as a client, want to insist on using opaque PRF inputs.
3178                  * So first verify that we really have a value from the server too. */
3179
3180                 if (s->s3->server_opaque_prf_input == NULL)
3181                         {
3182                         ret = SSL_TLSEXT_ERR_ALERT_FATAL;
3183                         al = SSL_AD_HANDSHAKE_FAILURE;
3184                         }
3185
3186                 /* Anytime the server *has* sent an opaque PRF input, we need to check
3187                  * that we have a client opaque PRF input of the same size. */
3188                 if (s->s3->client_opaque_prf_input == NULL ||
3189                     s->s3->client_opaque_prf_input_len != s->s3->server_opaque_prf_input_len)
3190                         {
3191                         ret = SSL_TLSEXT_ERR_ALERT_FATAL;
3192                         al = SSL_AD_ILLEGAL_PARAMETER;
3193                         }
3194                 }
3195 #endif
3196
3197         /* If we've requested certificate status and we wont get one
3198          * tell the callback
3199          */
3200         if ((s->tlsext_status_type != -1) && !(s->tlsext_status_expected)
3201                         && s->ctx && s->ctx->tlsext_status_cb)
3202                 {
3203                 int r;
3204                 /* Set resp to NULL, resplen to -1 so callback knows
3205                  * there is no response.
3206                  */
3207                 if (s->tlsext_ocsp_resp)
3208                         {
3209                         OPENSSL_free(s->tlsext_ocsp_resp);
3210                         s->tlsext_ocsp_resp = NULL;
3211                         }
3212                 s->tlsext_ocsp_resplen = -1;
3213                 r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
3214                 if (r == 0)
3215                         {
3216                         al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
3217                         ret = SSL_TLSEXT_ERR_ALERT_FATAL;
3218                         }
3219                 if (r < 0)
3220                         {
3221                         al = SSL_AD_INTERNAL_ERROR;
3222                         ret = SSL_TLSEXT_ERR_ALERT_FATAL;
3223                         }
3224                 }
3225
3226         switch (ret)
3227                 {
3228                 case SSL_TLSEXT_ERR_ALERT_FATAL:
3229                         ssl3_send_alert(s,SSL3_AL_FATAL,al);
3230                         return -1;
3231
3232                 case SSL_TLSEXT_ERR_ALERT_WARNING:
3233                         ssl3_send_alert(s,SSL3_AL_WARNING,al);
3234                         return 1;
3235
3236                 case SSL_TLSEXT_ERR_NOACK:
3237                         s->servername_done=0;
3238                         default:
3239                 return 1;
3240                 }
3241         }
3242
3243 int ssl_parse_serverhello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n)
3244         {
3245         int al = -1;
3246         if (s->version < SSL3_VERSION)
3247                 return 1;
3248         if (ssl_scan_serverhello_tlsext(s, p, d, n, &al) <= 0)
3249                 {
3250                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
3251                 return 0;
3252                 }
3253
3254         if (ssl_check_serverhello_tlsext(s) <= 0)
3255                 {
3256                 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_TLSEXT,SSL_R_SERVERHELLO_TLSEXT);
3257                 return 0;
3258                 }
3259         return 1;
3260 }
3261
3262 /*-
3263  * Since the server cache lookup is done early on in the processing of the
3264  * ClientHello, and other operations depend on the result, we need to handle
3265  * any TLS session ticket extension at the same time.
3266  *
3267  *   session_id: points at the session ID in the ClientHello. This code will
3268  *       read past the end of this in order to parse out the session ticket
3269  *       extension, if any.
3270  *   len: the length of the session ID.
3271  *   limit: a pointer to the first byte after the ClientHello.
3272  *   ret: (output) on return, if a ticket was decrypted, then this is set to
3273  *       point to the resulting session.
3274  *
3275  * If s->tls_session_secret_cb is set then we are expecting a pre-shared key
3276  * ciphersuite, in which case we have no use for session tickets and one will
3277  * never be decrypted, nor will s->tlsext_ticket_expected be set to 1.
3278  *
3279  * Returns:
3280  *   -1: fatal error, either from parsing or decrypting the ticket.
3281  *    0: no ticket was found (or was ignored, based on settings).
3282  *    1: a zero length extension was found, indicating that the client supports
3283  *       session tickets but doesn't currently have one to offer.
3284  *    2: either s->tls_session_secret_cb was set, or a ticket was offered but
3285  *       couldn't be decrypted because of a non-fatal error.
3286  *    3: a ticket was successfully decrypted and *ret was set.
3287  *
3288  * Side effects:
3289  *   Sets s->tlsext_ticket_expected to 1 if the server will have to issue
3290  *   a new session ticket to the client because the client indicated support
3291  *   (and s->tls_session_secret_cb is NULL) but the client either doesn't have
3292  *   a session ticket or we couldn't use the one it gave us, or if
3293  *   s->ctx->tlsext_ticket_key_cb asked to renew the client's ticket.
3294  *   Otherwise, s->tlsext_ticket_expected is set to 0.
3295  */
3296 int tls1_process_ticket(SSL *s, unsigned char *session_id, int len,
3297                         const unsigned char *limit, SSL_SESSION **ret)
3298         {
3299         /* Point after session ID in client hello */
3300         const unsigned char *p = session_id + len;
3301         unsigned short i;
3302
3303         *ret = NULL;
3304         s->tlsext_ticket_expected = 0;
3305
3306         /* If tickets disabled behave as if no ticket present
3307          * to permit stateful resumption.
3308          */
3309         if (!tls_use_ticket(s))
3310                 return 0;
3311         if ((s->version <= SSL3_VERSION) || !limit)
3312                 return 0;
3313         if (p >= limit)
3314                 return -1;
3315         /* Skip past DTLS cookie */
3316         if (SSL_IS_DTLS(s))
3317                 {
3318                 i = *(p++);
3319                 p+= i;
3320                 if (p >= limit)
3321                         return -1;
3322                 }
3323         /* Skip past cipher list */
3324         n2s(p, i);
3325         p+= i;
3326         if (p >= limit)
3327                 return -1;
3328         /* Skip past compression algorithm list */
3329         i = *(p++);
3330         p += i;
3331         if (p > limit)
3332                 return -1;
3333         /* Now at start of extensions */
3334         if ((p + 2) >= limit)
3335                 return 0;
3336         n2s(p, i);
3337         while ((p + 4) <= limit)
3338                 {
3339                 unsigned short type, size;
3340                 n2s(p, type);
3341                 n2s(p, size);
3342                 if (p + size > limit)
3343                         return 0;
3344                 if (type == TLSEXT_TYPE_session_ticket)
3345                         {
3346                         int r;
3347                         if (size == 0)
3348                                 {
3349                                 /* The client will accept a ticket but doesn't
3350                                  * currently have one. */
3351                                 s->tlsext_ticket_expected = 1;
3352                                 return 1;
3353                                 }
3354                         if (s->tls_session_secret_cb)
3355                                 {
3356                                 /* Indicate that the ticket couldn't be
3357                                  * decrypted rather than generating the session
3358                                  * from ticket now, trigger abbreviated
3359                                  * handshake based on external mechanism to
3360                                  * calculate the master secret later. */
3361                                 return 2;
3362                                 }
3363                         r = tls_decrypt_ticket(s, p, size, session_id, len, ret);
3364                         switch (r)
3365                                 {
3366                                 case 2: /* ticket couldn't be decrypted */
3367                                         s->tlsext_ticket_expected = 1;
3368                                         return 2;
3369                                 case 3: /* ticket was decrypted */
3370                                         return r;
3371                                 case 4: /* ticket decrypted but need to renew */
3372                                         s->tlsext_ticket_expected = 1;
3373                                         return 3;
3374                                 default: /* fatal error */
3375                                         return -1;
3376                                 }
3377                         }
3378                 p += size;
3379                 }
3380         return 0;
3381         }
3382
3383 /*-
3384  * tls_decrypt_ticket attempts to decrypt a session ticket.
3385  *
3386  *   etick: points to the body of the session ticket extension.
3387  *   eticklen: the length of the session tickets extenion.
3388  *   sess_id: points at the session ID.
3389  *   sesslen: the length of the session ID.
3390  *   psess: (output) on return, if a ticket was decrypted, then this is set to
3391  *       point to the resulting session.
3392  *
3393  * Returns:
3394  *   -1: fatal error, either from parsing or decrypting the ticket.
3395  *    2: the ticket couldn't be decrypted.
3396  *    3: a ticket was successfully decrypted and *psess was set.
3397  *    4: same as 3, but the ticket needs to be renewed.
3398  */
3399 static int tls_decrypt_ticket(SSL *s, const unsigned char *etick, int eticklen,
3400                                 const unsigned char *sess_id, int sesslen,
3401                                 SSL_SESSION **psess)
3402         {
3403         SSL_SESSION *sess;
3404         unsigned char *sdec;
3405         const unsigned char *p;
3406         int slen, mlen, renew_ticket = 0;
3407         unsigned char tick_hmac[EVP_MAX_MD_SIZE];
3408         HMAC_CTX hctx;
3409         EVP_CIPHER_CTX ctx;
3410         SSL_CTX *tctx = s->initial_ctx;
3411         /* Need at least keyname + iv + some encrypted data */
3412         if (eticklen < 48)
3413                 return 2;
3414         /* Initialize session ticket encryption and HMAC contexts */
3415         HMAC_CTX_init(&hctx);
3416         EVP_CIPHER_CTX_init(&ctx);
3417         if (tctx->tlsext_ticket_key_cb)
3418                 {
3419                 unsigned char *nctick = (unsigned char *)etick;
3420                 int rv = tctx->tlsext_ticket_key_cb(s, nctick, nctick + 16,
3421                                                         &ctx, &hctx, 0);
3422                 if (rv < 0)
3423                         return -1;
3424                 if (rv == 0)
3425                         return 2;
3426                 if (rv == 2)
3427                         renew_ticket = 1;
3428                 }
3429         else
3430                 {
3431                 /* Check key name matches */
3432                 if (memcmp(etick, tctx->tlsext_tick_key_name, 16))
3433                         return 2;
3434                 HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
3435                                         tlsext_tick_md(), NULL);
3436                 EVP_DecryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
3437                                 tctx->tlsext_tick_aes_key, etick + 16);
3438                 }
3439         /* Attempt to process session ticket, first conduct sanity and
3440          * integrity checks on ticket.
3441          */
3442         mlen = HMAC_size(&hctx);
3443         if (mlen < 0)
3444                 {
3445                 EVP_CIPHER_CTX_cleanup(&ctx);
3446                 return -1;
3447                 }
3448         eticklen -= mlen;
3449         /* Check HMAC of encrypted ticket */
3450         HMAC_Update(&hctx, etick, eticklen);
3451         HMAC_Final(&hctx, tick_hmac, NULL);
3452         HMAC_CTX_cleanup(&hctx);
3453         if (CRYPTO_memcmp(tick_hmac, etick + eticklen, mlen))
3454                 {
3455                 EVP_CIPHER_CTX_cleanup(&ctx);
3456                 return 2;
3457                 }
3458         /* Attempt to decrypt session data */
3459         /* Move p after IV to start of encrypted ticket, update length */
3460         p = etick + 16 + EVP_CIPHER_CTX_iv_length(&ctx);
3461         eticklen -= 16 + EVP_CIPHER_CTX_iv_length(&ctx);
3462         sdec = OPENSSL_malloc(eticklen);
3463         if (!sdec)
3464                 {
3465                 EVP_CIPHER_CTX_cleanup(&ctx);
3466                 return -1;
3467                 }
3468         EVP_DecryptUpdate(&ctx, sdec, &slen, p, eticklen);
3469         if (EVP_DecryptFinal(&ctx, sdec + slen, &mlen) <= 0)
3470                 {
3471                 EVP_CIPHER_CTX_cleanup(&ctx);
3472                 OPENSSL_free(sdec);
3473                 return 2;
3474                 }
3475         slen += mlen;
3476         EVP_CIPHER_CTX_cleanup(&ctx);
3477         p = sdec;
3478
3479         sess = d2i_SSL_SESSION(NULL, &p, slen);
3480         OPENSSL_free(sdec);
3481         if (sess)
3482                 {
3483                 /* The session ID, if non-empty, is used by some clients to
3484                  * detect that the ticket has been accepted. So we copy it to
3485                  * the session structure. If it is empty set length to zero
3486                  * as required by standard.
3487                  */
3488                 if (sesslen)
3489                         memcpy(sess->session_id, sess_id, sesslen);
3490                 sess->session_id_length = sesslen;
3491                 *psess = sess;
3492                 if (renew_ticket)
3493                         return 4;
3494                 else
3495                         return 3;
3496                 }
3497         ERR_clear_error();
3498         /* For session parse failure, indicate that we need to send a new
3499          * ticket. */
3500         return 2;
3501         }
3502
3503 /* Tables to translate from NIDs to TLS v1.2 ids */
3504
3505 typedef struct
3506         {
3507         int nid;
3508         int id;
3509         } tls12_lookup;
3510
3511 static tls12_lookup tls12_md[] = {
3512         {NID_md5, TLSEXT_hash_md5},
3513         {NID_sha1, TLSEXT_hash_sha1},
3514         {NID_sha224, TLSEXT_hash_sha224},
3515         {NID_sha256, TLSEXT_hash_sha256},
3516         {NID_sha384, TLSEXT_hash_sha384},
3517         {NID_sha512, TLSEXT_hash_sha512}
3518 };
3519
3520 static tls12_lookup tls12_sig[] = {
3521         {EVP_PKEY_RSA, TLSEXT_signature_rsa},
3522         {EVP_PKEY_DSA, TLSEXT_signature_dsa},
3523         {EVP_PKEY_EC, TLSEXT_signature_ecdsa}
3524 };
3525
3526 static int tls12_find_id(int nid, tls12_lookup *table, size_t tlen)
3527         {
3528         size_t i;
3529         for (i = 0; i < tlen; i++)
3530                 {
3531                 if (table[i].nid == nid)
3532                         return table[i].id;
3533                 }
3534         return -1;
3535         }
3536
3537 static int tls12_find_nid(int id, tls12_lookup *table, size_t tlen)
3538         {
3539         size_t i;
3540         for (i = 0; i < tlen; i++)
3541                 {
3542                 if ((table[i].id) == id)
3543                         return table[i].nid;
3544                 }
3545         return NID_undef;
3546         }
3547
3548 int tls12_get_sigandhash(unsigned char *p, const EVP_PKEY *pk, const EVP_MD *md)
3549         {
3550         int sig_id, md_id;
3551         if (!md)
3552                 return 0;
3553         md_id = tls12_find_id(EVP_MD_type(md), tls12_md,
3554                                 sizeof(tls12_md)/sizeof(tls12_lookup));
3555         if (md_id == -1)
3556                 return 0;
3557         sig_id = tls12_get_sigid(pk);
3558         if (sig_id == -1)
3559                 return 0;
3560         p[0] = (unsigned char)md_id;
3561         p[1] = (unsigned char)sig_id;
3562         return 1;
3563         }
3564
3565 int tls12_get_sigid(const EVP_PKEY *pk)
3566         {
3567         return tls12_find_id(pk->type, tls12_sig,
3568                                 sizeof(tls12_sig)/sizeof(tls12_lookup));
3569         }
3570
3571 typedef struct
3572         {
3573         int nid;
3574         int secbits;
3575         const EVP_MD *(*mfunc)(void);
3576         } tls12_hash_info;
3577
3578 static const tls12_hash_info tls12_md_info[] = {
3579 #ifdef OPENSSL_NO_MD5
3580         {NID_md5, 64, 0},
3581 #else
3582         {NID_md5, 64, EVP_md5},
3583 #endif
3584 #ifdef OPENSSL_NO_SHA
3585         {NID_sha1, 80, 0},
3586 #else
3587         {NID_sha1, 80, EVP_sha1},
3588 #endif
3589 #ifdef OPENSSL_NO_SHA256
3590         {NID_sha224, 112, 0},
3591         {NID_sha256, 128, 0},
3592 #else
3593         {NID_sha224, 112, EVP_sha224},
3594         {NID_sha256, 128, EVP_sha256},
3595 #endif
3596 #ifdef OPENSSL_NO_SHA512
3597         {NID_sha384, 192, 0},
3598         {NID_sha512, 256, 0}
3599 #else
3600         {NID_sha384, 192, EVP_sha384},
3601         {NID_sha512, 256, EVP_sha512}
3602 #endif
3603 };
3604
3605 static const tls12_hash_info *tls12_get_hash_info(unsigned char hash_alg)
3606         {
3607         if (hash_alg == 0)
3608                 return NULL;
3609         if (hash_alg > sizeof(tls12_md_info)/sizeof(tls12_md_info[0]))
3610                 return NULL;
3611         return tls12_md_info + hash_alg - 1;
3612         }
3613
3614 const EVP_MD *tls12_get_hash(unsigned char hash_alg)
3615         {
3616         const tls12_hash_info *inf;
3617         if (hash_alg == TLSEXT_hash_md5 && FIPS_mode())
3618                 return NULL;
3619         inf = tls12_get_hash_info(hash_alg);
3620         if (!inf || !inf->mfunc)
3621                 return NULL;
3622         return inf->mfunc();
3623         }
3624
3625 static int tls12_get_pkey_idx(unsigned char sig_alg)
3626         {
3627         switch(sig_alg)
3628                 {
3629 #ifndef OPENSSL_NO_RSA
3630         case TLSEXT_signature_rsa:
3631                 return SSL_PKEY_RSA_SIGN;
3632 #endif
3633 #ifndef OPENSSL_NO_DSA
3634         case TLSEXT_signature_dsa:
3635                 return SSL_PKEY_DSA_SIGN;
3636 #endif
3637 #ifndef OPENSSL_NO_ECDSA
3638         case TLSEXT_signature_ecdsa:
3639                 return SSL_PKEY_ECC;
3640 #endif
3641                 }
3642         return -1;
3643         }
3644
3645 /* Convert TLS 1.2 signature algorithm extension values into NIDs */
3646 static void tls1_lookup_sigalg(int *phash_nid, int *psign_nid,
3647                         int *psignhash_nid, const unsigned char *data)
3648         {
3649         int sign_nid = 0, hash_nid = 0;
3650         if (!phash_nid && !psign_nid && !psignhash_nid)
3651                 return;
3652         if (phash_nid || psignhash_nid)
3653                 {
3654                 hash_nid = tls12_find_nid(data[0], tls12_md,
3655                                         sizeof(tls12_md)/sizeof(tls12_lookup));
3656                 if (phash_nid)
3657                         *phash_nid = hash_nid;
3658                 }
3659         if (psign_nid || psignhash_nid)
3660                 {
3661                 sign_nid = tls12_find_nid(data[1], tls12_sig,
3662                                         sizeof(tls12_sig)/sizeof(tls12_lookup));
3663                 if (psign_nid)
3664                         *psign_nid = sign_nid;
3665                 }
3666         if (psignhash_nid)
3667                 {
3668                 if (sign_nid && hash_nid)
3669                         OBJ_find_sigid_by_algs(psignhash_nid,
3670                                                         hash_nid, sign_nid);
3671                 else
3672                         *psignhash_nid = NID_undef;
3673                 }
3674         }
3675 /* Check to see if a signature algorithm is allowed */
3676 static int tls12_sigalg_allowed(SSL *s, int op, const unsigned char *ptmp)
3677         {
3678         /* See if we have an entry in the hash table and it is enabled */
3679         const tls12_hash_info *hinf = tls12_get_hash_info(ptmp[0]);
3680         if (!hinf || !hinf->mfunc)
3681                 return 0;
3682         /* See if public key algorithm allowed */
3683         if (tls12_get_pkey_idx(ptmp[1]) == -1)
3684                 return 0;
3685         /* Finally see if security callback allows it */
3686         return ssl_security(s, op, hinf->secbits, hinf->nid, (void *)ptmp);
3687         }
3688
3689 /* Get a mask of disabled public key algorithms based on supported
3690  * signature algorithms. For example if no signature algorithm supports RSA
3691  * then RSA is disabled.
3692  */
3693
3694 void ssl_set_sig_mask(unsigned long *pmask_a, SSL *s, int op)
3695         {
3696         const unsigned char *sigalgs;
3697         size_t i, sigalgslen;
3698         int have_rsa = 0, have_dsa = 0, have_ecdsa = 0;
3699         /* Now go through all signature algorithms seeing if we support
3700          * any for RSA, DSA, ECDSA. Do this for all versions not just
3701          * TLS 1.2. To keep down calls to security callback only check
3702          * if we have to.
3703          */
3704         sigalgslen = tls12_get_psigalgs(s, &sigalgs);
3705         for (i = 0; i < sigalgslen; i += 2, sigalgs += 2)
3706                 {
3707                 switch(sigalgs[1])
3708                         {
3709 #ifndef OPENSSL_NO_RSA
3710                 case TLSEXT_signature_rsa:
3711                         if (!have_rsa && tls12_sigalg_allowed(s, op, sigalgs))
3712                                 have_rsa = 1;
3713                         break;
3714 #endif
3715 #ifndef OPENSSL_NO_DSA
3716                 case TLSEXT_signature_dsa:
3717                         if (!have_dsa && tls12_sigalg_allowed(s, op, sigalgs))
3718                                 have_dsa = 1;
3719                         break;
3720 #endif
3721 #ifndef OPENSSL_NO_ECDSA
3722                 case TLSEXT_signature_ecdsa:
3723                         if (!have_ecdsa && tls12_sigalg_allowed(s, op, sigalgs))
3724                                 have_ecdsa = 1;
3725                         break;
3726 #endif
3727                         }
3728                 }
3729         if (!have_rsa)
3730                 *pmask_a |= SSL_aRSA;
3731         if (!have_dsa)
3732                 *pmask_a |= SSL_aDSS;
3733         if (!have_ecdsa)
3734                 *pmask_a |= SSL_aECDSA;
3735         }
3736
3737 size_t tls12_copy_sigalgs(SSL *s, unsigned char *out,
3738                                 const unsigned char *psig, size_t psiglen)
3739         {
3740         unsigned char *tmpout = out;
3741         size_t i;
3742         for (i = 0; i < psiglen; i += 2, psig += 2)
3743                 {
3744                 if (tls12_sigalg_allowed(s, SSL_SECOP_SIGALG_SUPPORTED, psig))
3745                         {
3746                         *tmpout++ = psig[0];
3747                         *tmpout++ = psig[1];
3748                         }
3749                 }
3750         return tmpout - out;
3751         }
3752
3753 /* Given preference and allowed sigalgs set shared sigalgs */
3754 static int tls12_shared_sigalgs(SSL *s, TLS_SIGALGS *shsig,
3755                                 const unsigned char *pref, size_t preflen,
3756                                 const unsigned char *allow, size_t allowlen)
3757         {
3758         const unsigned char *ptmp, *atmp;
3759         size_t i, j, nmatch = 0;
3760         for (i = 0, ptmp = pref; i < preflen; i+=2, ptmp+=2)
3761                 {
3762                 /* Skip disabled hashes or signature algorithms */
3763                 if (!tls12_sigalg_allowed(s, SSL_SECOP_SIGALG_SHARED, ptmp))
3764                         continue;
3765                 for (j = 0, atmp = allow; j < allowlen; j+=2, atmp+=2)
3766                         {
3767                         if (ptmp[0] == atmp[0] && ptmp[1] == atmp[1])
3768                                 {
3769                                 nmatch++;
3770                                 if (shsig)
3771                                         {
3772                                         shsig->rhash = ptmp[0];
3773                                         shsig->rsign = ptmp[1];
3774                                         tls1_lookup_sigalg(&shsig->hash_nid,
3775                                                 &shsig->sign_nid,
3776                                                 &shsig->signandhash_nid,
3777                                                 ptmp);
3778                                         shsig++;
3779                                         }
3780                                 break;
3781                                 }
3782                         }
3783                 }
3784         return nmatch;
3785         }
3786
3787 /* Set shared signature algorithms for SSL structures */
3788 static int tls1_set_shared_sigalgs(SSL *s)
3789         {
3790         const unsigned char *pref, *allow, *conf;
3791         size_t preflen, allowlen, conflen;
3792         size_t nmatch;
3793         TLS_SIGALGS *salgs = NULL;
3794         CERT *c = s->cert;
3795         unsigned int is_suiteb = tls1_suiteb(s);
3796         if (c->shared_sigalgs)
3797                 {
3798                 OPENSSL_free(c->shared_sigalgs);
3799                 c->shared_sigalgs = NULL;
3800                 }
3801         /* If client use client signature algorithms if not NULL */
3802         if (!s->server && c->client_sigalgs && !is_suiteb)
3803                 {
3804                 conf = c->client_sigalgs;
3805                 conflen = c->client_sigalgslen;
3806                 }
3807         else if (c->conf_sigalgs && !is_suiteb)
3808                 {
3809                 conf = c->conf_sigalgs;
3810                 conflen = c->conf_sigalgslen;
3811                 }
3812         else
3813                 conflen = tls12_get_psigalgs(s, &conf);
3814         if(s->options & SSL_OP_CIPHER_SERVER_PREFERENCE || is_suiteb)
3815                 {
3816                 pref = conf;
3817                 preflen = conflen;
3818                 allow = c->peer_sigalgs;
3819                 allowlen = c->peer_sigalgslen;
3820                 }
3821         else
3822                 {
3823                 allow = conf;
3824                 allowlen = conflen;
3825                 pref = c->peer_sigalgs;
3826                 preflen = c->peer_sigalgslen;
3827                 }
3828         nmatch = tls12_shared_sigalgs(s, NULL, pref, preflen, allow, allowlen);
3829         if (!nmatch)
3830                 return 1;
3831         salgs = OPENSSL_malloc(nmatch * sizeof(TLS_SIGALGS));
3832         if (!salgs)
3833                 return 0;
3834         nmatch = tls12_shared_sigalgs(s, salgs, pref, preflen, allow, allowlen);
3835         c->shared_sigalgs = salgs;
3836         c->shared_sigalgslen = nmatch;
3837         return 1;
3838         }
3839
3840
3841 /* Set preferred digest for each key type */
3842
3843 int tls1_save_sigalgs(SSL *s, const unsigned char *data, int dsize)
3844         {
3845         CERT *c = s->cert;
3846         /* Extension ignored for inappropriate versions */
3847         if (!SSL_USE_SIGALGS(s))
3848                 return 1;
3849         /* Should never happen */
3850         if (!c)
3851                 return 0;
3852
3853         if (c->peer_sigalgs)
3854                 OPENSSL_free(c->peer_sigalgs);
3855         c->peer_sigalgs = OPENSSL_malloc(dsize);
3856         if (!c->peer_sigalgs)
3857                 return 0;
3858         c->peer_sigalgslen = dsize;
3859         memcpy(c->peer_sigalgs, data, dsize);
3860         return 1;
3861         }
3862
3863 int tls1_process_sigalgs(SSL *s)
3864         {
3865         int idx;
3866         size_t i;
3867         const EVP_MD *md;
3868         CERT *c = s->cert;
3869         TLS_SIGALGS *sigptr;
3870         if (!tls1_set_shared_sigalgs(s))
3871                 return 0;
3872
3873 #ifdef OPENSSL_SSL_DEBUG_BROKEN_PROTOCOL
3874         if (s->cert->cert_flags & SSL_CERT_FLAG_BROKEN_PROTOCOL)
3875                 {
3876                 /* Use first set signature preference to force message
3877                  * digest, ignoring any peer preferences.
3878                  */
3879                 const unsigned char *sigs = NULL;
3880                 if (s->server)
3881                         sigs = c->conf_sigalgs;
3882                 else
3883                         sigs = c->client_sigalgs;
3884                 if (sigs)
3885                         {
3886                         idx = tls12_get_pkey_idx(sigs[1]);
3887                         md = tls12_get_hash(sigs[0]);
3888                         c->pkeys[idx].digest = md;
3889                         c->pkeys[idx].valid_flags = CERT_PKEY_EXPLICIT_SIGN;
3890                         if (idx == SSL_PKEY_RSA_SIGN)
3891                                 {
3892                                 c->pkeys[SSL_PKEY_RSA_ENC].valid_flags = CERT_PKEY_EXPLICIT_SIGN;
3893                                 c->pkeys[SSL_PKEY_RSA_ENC].digest = md;
3894                                 }
3895                         }
3896                 }
3897 #endif
3898
3899         for (i = 0, sigptr = c->shared_sigalgs;
3900                         i < c->shared_sigalgslen; i++, sigptr++)
3901                 {
3902                 idx = tls12_get_pkey_idx(sigptr->rsign);
3903                 if (idx > 0 && c->pkeys[idx].digest == NULL)
3904                         {
3905                         md = tls12_get_hash(sigptr->rhash);
3906                         c->pkeys[idx].digest = md;
3907                         c->pkeys[idx].valid_flags = CERT_PKEY_EXPLICIT_SIGN;
3908                         if (idx == SSL_PKEY_RSA_SIGN)
3909                                 {
3910                                 c->pkeys[SSL_PKEY_RSA_ENC].valid_flags = CERT_PKEY_EXPLICIT_SIGN;
3911                                 c->pkeys[SSL_PKEY_RSA_ENC].digest = md;
3912                                 }
3913                         }
3914
3915                 }
3916         /* In strict mode leave unset digests as NULL to indicate we can't
3917          * use the certificate for signing.
3918          */
3919         if (!(s->cert->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT))
3920                 {
3921                 /* Set any remaining keys to default values. NOTE: if alg is
3922                  * not supported it stays as NULL.
3923                  */
3924 #ifndef OPENSSL_NO_DSA
3925                 if (!c->pkeys[SSL_PKEY_DSA_SIGN].digest)
3926                         c->pkeys[SSL_PKEY_DSA_SIGN].digest = EVP_sha1();
3927 #endif
3928 #ifndef OPENSSL_NO_RSA
3929                 if (!c->pkeys[SSL_PKEY_RSA_SIGN].digest)
3930                         {
3931                         c->pkeys[SSL_PKEY_RSA_SIGN].digest = EVP_sha1();
3932                         c->pkeys[SSL_PKEY_RSA_ENC].digest = EVP_sha1();
3933                         }
3934 #endif
3935 #ifndef OPENSSL_NO_ECDSA
3936                 if (!c->pkeys[SSL_PKEY_ECC].digest)
3937                         c->pkeys[SSL_PKEY_ECC].digest = EVP_sha1();
3938 #endif
3939                 }
3940         return 1;
3941         }
3942
3943
3944 int SSL_get_sigalgs(SSL *s, int idx,
3945                         int *psign, int *phash, int *psignhash,
3946                         unsigned char *rsig, unsigned char *rhash)
3947         {
3948         const unsigned char *psig = s->cert->peer_sigalgs;
3949         if (psig == NULL)
3950                 return 0;
3951         if (idx >= 0)
3952                 {
3953                 idx <<= 1;
3954                 if (idx >= (int)s->cert->peer_sigalgslen)
3955                         return 0;
3956                 psig += idx;
3957                 if (rhash)
3958                         *rhash = psig[0];
3959                 if (rsig)
3960                         *rsig = psig[1];
3961                 tls1_lookup_sigalg(phash, psign, psignhash, psig);
3962                 }
3963         return s->cert->peer_sigalgslen / 2;
3964         }
3965
3966 int SSL_get_shared_sigalgs(SSL *s, int idx,
3967                         int *psign, int *phash, int *psignhash,
3968                         unsigned char *rsig, unsigned char *rhash)
3969         {
3970         TLS_SIGALGS *shsigalgs = s->cert->shared_sigalgs;
3971         if (!shsigalgs || idx >= (int)s->cert->shared_sigalgslen)
3972                 return 0;
3973         shsigalgs += idx;
3974         if (phash)
3975                 *phash = shsigalgs->hash_nid;
3976         if (psign)
3977                 *psign = shsigalgs->sign_nid;
3978         if (psignhash)
3979                 *psignhash = shsigalgs->signandhash_nid;
3980         if (rsig)
3981                 *rsig = shsigalgs->rsign;
3982         if (rhash)
3983                 *rhash = shsigalgs->rhash;
3984         return s->cert->shared_sigalgslen;
3985         }
3986
3987
3988 #ifndef OPENSSL_NO_HEARTBEATS
3989 int
3990 tls1_process_heartbeat(SSL *s)
3991         {
3992         unsigned char *p = &s->s3->rrec.data[0], *pl;
3993         unsigned short hbtype;
3994         unsigned int payload;
3995         unsigned int padding = 16; /* Use minimum padding */
3996
3997         if (s->msg_callback)
3998                 s->msg_callback(0, s->version, TLS1_RT_HEARTBEAT,
3999                         &s->s3->rrec.data[0], s->s3->rrec.length,
4000                         s, s->msg_callback_arg);
4001
4002         /* Read type and payload length first */
4003         if (1 + 2 + 16 > s->s3->rrec.length)
4004                 return 0; /* silently discard */
4005         hbtype = *p++;
4006         n2s(p, payload);
4007         if (1 + 2 + payload + 16 > s->s3->rrec.length)
4008                 return 0; /* silently discard per RFC 6520 sec. 4 */
4009         pl = p;
4010
4011         if (hbtype == TLS1_HB_REQUEST)
4012                 {
4013                 unsigned char *buffer, *bp;
4014                 int r;
4015
4016                 /* Allocate memory for the response, size is 1 bytes
4017                  * message type, plus 2 bytes payload length, plus
4018                  * payload, plus padding
4019                  */
4020                 buffer = OPENSSL_malloc(1 + 2 + payload + padding);
4021                 if (buffer == NULL)
4022                         {
4023                         SSLerr(SSL_F_TLS1_PROCESS_HEARTBEAT,ERR_R_MALLOC_FAILURE);
4024                         return -1;
4025                         }
4026                 bp = buffer;
4027
4028                 /* Enter response type, length and copy payload */
4029                 *bp++ = TLS1_HB_RESPONSE;
4030                 s2n(payload, bp);
4031                 memcpy(bp, pl, payload);
4032                 bp += payload;
4033                 /* Random padding */
4034                 RAND_pseudo_bytes(bp, padding);
4035
4036                 r = ssl3_write_bytes(s, TLS1_RT_HEARTBEAT, buffer, 3 + payload + padding);
4037
4038                 if (r >= 0 && s->msg_callback)
4039                         s->msg_callback(1, s->version, TLS1_RT_HEARTBEAT,
4040                                 buffer, 3 + payload + padding,
4041                                 s, s->msg_callback_arg);
4042
4043                 OPENSSL_free(buffer);
4044
4045                 if (r < 0)
4046                         return r;
4047                 }
4048         else if (hbtype == TLS1_HB_RESPONSE)
4049                 {
4050                 unsigned int seq;
4051
4052                 /* We only send sequence numbers (2 bytes unsigned int),
4053                  * and 16 random bytes, so we just try to read the
4054                  * sequence number */
4055                 n2s(pl, seq);
4056
4057                 if (payload == 18 && seq == s->tlsext_hb_seq)
4058                         {
4059                         s->tlsext_hb_seq++;
4060                         s->tlsext_hb_pending = 0;
4061                         }
4062                 }
4063
4064         return 0;
4065         }
4066
4067 int
4068 tls1_heartbeat(SSL *s)
4069         {
4070         unsigned char *buf, *p;
4071         int ret;
4072         unsigned int payload = 18; /* Sequence number + random bytes */
4073         unsigned int padding = 16; /* Use minimum padding */
4074
4075         /* Only send if peer supports and accepts HB requests... */
4076         if (!(s->tlsext_heartbeat & SSL_TLSEXT_HB_ENABLED) ||
4077             s->tlsext_heartbeat & SSL_TLSEXT_HB_DONT_SEND_REQUESTS)
4078                 {
4079                 SSLerr(SSL_F_TLS1_HEARTBEAT,SSL_R_TLS_HEARTBEAT_PEER_DOESNT_ACCEPT);
4080                 return -1;
4081                 }
4082
4083         /* ...and there is none in flight yet... */
4084         if (s->tlsext_hb_pending)
4085                 {
4086                 SSLerr(SSL_F_TLS1_HEARTBEAT,SSL_R_TLS_HEARTBEAT_PENDING);
4087                 return -1;
4088                 }
4089
4090         /* ...and no handshake in progress. */
4091         if (SSL_in_init(s) || s->in_handshake)
4092                 {
4093                 SSLerr(SSL_F_TLS1_HEARTBEAT,SSL_R_UNEXPECTED_MESSAGE);
4094                 return -1;
4095                 }
4096
4097         /* Check if padding is too long, payload and padding
4098          * must not exceed 2^14 - 3 = 16381 bytes in total.
4099          */
4100         OPENSSL_assert(payload + padding <= 16381);
4101
4102         /*-
4103          * Create HeartBeat message, we just use a sequence number
4104          * as payload to distuingish different messages and add
4105          * some random stuff.
4106          *  - Message Type, 1 byte
4107          *  - Payload Length, 2 bytes (unsigned int)
4108          *  - Payload, the sequence number (2 bytes uint)
4109          *  - Payload, random bytes (16 bytes uint)
4110          *  - Padding
4111          */
4112         buf = OPENSSL_malloc(1 + 2 + payload + padding);
4113         if (buf == NULL)
4114                 {
4115                 SSLerr(SSL_F_TLS1_HEARTBEAT,ERR_R_MALLOC_FAILURE);
4116                 return -1;
4117                 }
4118         p = buf;
4119         /* Message Type */
4120         *p++ = TLS1_HB_REQUEST;
4121         /* Payload length (18 bytes here) */
4122         s2n(payload, p);
4123         /* Sequence number */
4124         s2n(s->tlsext_hb_seq, p);
4125         /* 16 random bytes */
4126         RAND_pseudo_bytes(p, 16);
4127         p += 16;
4128         /* Random padding */
4129         RAND_pseudo_bytes(p, padding);
4130
4131         ret = ssl3_write_bytes(s, TLS1_RT_HEARTBEAT, buf, 3 + payload + padding);
4132         if (ret >= 0)
4133                 {
4134                 if (s->msg_callback)
4135                         s->msg_callback(1, s->version, TLS1_RT_HEARTBEAT,
4136                                 buf, 3 + payload + padding,
4137                                 s, s->msg_callback_arg);
4138
4139                 s->tlsext_hb_pending = 1;
4140                 }
4141
4142         OPENSSL_free(buf);
4143
4144         return ret;
4145         }
4146 #endif
4147
4148 #define MAX_SIGALGLEN   (TLSEXT_hash_num * TLSEXT_signature_num * 2)
4149
4150 typedef struct
4151         {
4152         size_t sigalgcnt;
4153         int sigalgs[MAX_SIGALGLEN];
4154         } sig_cb_st;
4155
4156 static int sig_cb(const char *elem, int len, void *arg)
4157         {
4158         sig_cb_st *sarg = arg;
4159         size_t i;
4160         char etmp[20], *p;
4161         int sig_alg, hash_alg;
4162         if (sarg->sigalgcnt == MAX_SIGALGLEN)
4163                 return 0;
4164         if (len > (int)(sizeof(etmp) - 1))
4165                 return 0;
4166         memcpy(etmp, elem, len);
4167         etmp[len] = 0;
4168         p = strchr(etmp, '+');
4169         if (!p)
4170                 return 0;
4171         *p = 0;
4172         p++;
4173         if (!*p)
4174                 return 0;
4175
4176         if (!strcmp(etmp, "RSA"))
4177                 sig_alg = EVP_PKEY_RSA;
4178         else if (!strcmp(etmp, "DSA"))
4179                 sig_alg = EVP_PKEY_DSA;
4180         else if (!strcmp(etmp, "ECDSA"))
4181                 sig_alg = EVP_PKEY_EC;
4182         else return 0;
4183
4184         hash_alg = OBJ_sn2nid(p);
4185         if (hash_alg == NID_undef)
4186                 hash_alg = OBJ_ln2nid(p);
4187         if (hash_alg == NID_undef)
4188                 return 0;
4189
4190         for (i = 0; i < sarg->sigalgcnt; i+=2)
4191                 {
4192                 if (sarg->sigalgs[i] == sig_alg
4193                         && sarg->sigalgs[i + 1] == hash_alg)
4194                         return 0;
4195                 }
4196         sarg->sigalgs[sarg->sigalgcnt++] = hash_alg;
4197         sarg->sigalgs[sarg->sigalgcnt++] = sig_alg;
4198         return 1;
4199         }
4200
4201 /* Set suppored signature algorithms based on a colon separated list
4202  * of the form sig+hash e.g. RSA+SHA512:DSA+SHA512 */
4203 int tls1_set_sigalgs_list(CERT *c, const char *str, int client)
4204         {
4205         sig_cb_st sig;
4206         sig.sigalgcnt = 0;
4207         if (!CONF_parse_list(str, ':', 1, sig_cb, &sig))
4208                 return 0;
4209         if (c == NULL)
4210                 return 1;
4211         return tls1_set_sigalgs(c, sig.sigalgs, sig.sigalgcnt, client);
4212         }
4213
4214 int tls1_set_sigalgs(CERT *c, const int *psig_nids, size_t salglen, int client)
4215         {
4216         unsigned char *sigalgs, *sptr;
4217         int rhash, rsign;
4218         size_t i;
4219         if (salglen & 1)
4220                 return 0;
4221         sigalgs = OPENSSL_malloc(salglen);
4222         if (sigalgs == NULL)
4223                 return 0;
4224         for (i = 0, sptr = sigalgs; i < salglen; i+=2)
4225                 {
4226                 rhash = tls12_find_id(*psig_nids++, tls12_md,
4227                                         sizeof(tls12_md)/sizeof(tls12_lookup));
4228                 rsign = tls12_find_id(*psig_nids++, tls12_sig,
4229                                 sizeof(tls12_sig)/sizeof(tls12_lookup));
4230
4231                 if (rhash == -1 || rsign == -1)
4232                         goto err;
4233                 *sptr++ = rhash;
4234                 *sptr++ = rsign;
4235                 }
4236
4237         if (client)
4238                 {
4239                 if (c->client_sigalgs)
4240                         OPENSSL_free(c->client_sigalgs);
4241                 c->client_sigalgs = sigalgs;
4242                 c->client_sigalgslen = salglen;
4243                 }
4244         else
4245                 {
4246                 if (c->conf_sigalgs)
4247                         OPENSSL_free(c->conf_sigalgs);
4248                 c->conf_sigalgs = sigalgs;
4249                 c->conf_sigalgslen = salglen;
4250                 }
4251
4252         return 1;
4253
4254         err:
4255         OPENSSL_free(sigalgs);
4256         return 0;
4257         }
4258
4259 static int tls1_check_sig_alg(CERT *c, X509 *x, int default_nid)
4260         {
4261         int sig_nid;
4262         size_t i;
4263         if (default_nid == -1)
4264                 return 1;
4265         sig_nid = X509_get_signature_nid(x);
4266         if (default_nid)
4267                 return sig_nid == default_nid ? 1 : 0;
4268         for (i = 0; i < c->shared_sigalgslen; i++)
4269                 if (sig_nid == c->shared_sigalgs[i].signandhash_nid)
4270                         return 1;
4271         return 0;
4272         }
4273 /* Check to see if a certificate issuer name matches list of CA names */
4274 static int ssl_check_ca_name(STACK_OF(X509_NAME) *names, X509 *x)
4275         {
4276         X509_NAME *nm;
4277         int i;
4278         nm = X509_get_issuer_name(x);
4279         for (i = 0; i < sk_X509_NAME_num(names); i++)
4280                 {
4281                 if(!X509_NAME_cmp(nm, sk_X509_NAME_value(names, i)))
4282                         return 1;
4283                 }
4284         return 0;
4285         }
4286
4287 /* Check certificate chain is consistent with TLS extensions and is
4288  * usable by server. This servers two purposes: it allows users to
4289  * check chains before passing them to the server and it allows the
4290  * server to check chains before attempting to use them.
4291  */
4292
4293 /* Flags which need to be set for a certificate when stict mode not set */
4294
4295 #define CERT_PKEY_VALID_FLAGS \
4296         (CERT_PKEY_EE_SIGNATURE|CERT_PKEY_EE_PARAM)
4297 /* Strict mode flags */
4298 #define CERT_PKEY_STRICT_FLAGS \
4299          (CERT_PKEY_VALID_FLAGS|CERT_PKEY_CA_SIGNATURE|CERT_PKEY_CA_PARAM \
4300          | CERT_PKEY_ISSUER_NAME|CERT_PKEY_CERT_TYPE)
4301
4302 int tls1_check_chain(SSL *s, X509 *x, EVP_PKEY *pk, STACK_OF(X509) *chain,
4303                                                                         int idx)
4304         {
4305         int i;
4306         int rv = 0;
4307         int check_flags = 0, strict_mode;
4308         CERT_PKEY *cpk = NULL;
4309         CERT *c = s->cert;
4310         unsigned int suiteb_flags = tls1_suiteb(s);
4311         /* idx == -1 means checking server chains */
4312         if (idx != -1)
4313                 {
4314                 /* idx == -2 means checking client certificate chains */
4315                 if (idx == -2)
4316                         {
4317                         cpk = c->key;
4318                         idx = cpk - c->pkeys;
4319                         }
4320                 else
4321                         cpk = c->pkeys + idx;
4322                 x = cpk->x509;
4323                 pk = cpk->privatekey;
4324                 chain = cpk->chain;
4325                 strict_mode = c->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT;
4326                 /* If no cert or key, forget it */
4327                 if (!x || !pk)
4328                         goto end;
4329 #ifdef OPENSSL_SSL_DEBUG_BROKEN_PROTOCOL
4330                 /* Allow any certificate to pass test */
4331                 if (s->cert->cert_flags & SSL_CERT_FLAG_BROKEN_PROTOCOL)
4332                         {
4333                         rv = CERT_PKEY_STRICT_FLAGS|CERT_PKEY_EXPLICIT_SIGN|CERT_PKEY_VALID|CERT_PKEY_SIGN;
4334                         cpk->valid_flags = rv;
4335                         return rv;
4336                         }
4337 #endif
4338                 }
4339         else
4340                 {
4341                 if (!x || !pk)
4342                         goto end;
4343                 idx = ssl_cert_type(x, pk);
4344                 if (idx == -1)
4345                         goto end;
4346                 cpk = c->pkeys + idx;
4347                 if (c->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT)
4348                         check_flags = CERT_PKEY_STRICT_FLAGS;
4349                 else
4350                         check_flags = CERT_PKEY_VALID_FLAGS;
4351                 strict_mode = 1;
4352                 }
4353
4354         if (suiteb_flags)
4355                 {
4356                 int ok;
4357                 if (check_flags)
4358                         check_flags |= CERT_PKEY_SUITEB;
4359                 ok = X509_chain_check_suiteb(NULL, x, chain, suiteb_flags);
4360                 if (ok == X509_V_OK)
4361                         rv |= CERT_PKEY_SUITEB;
4362                 else if (!check_flags)
4363                         goto end;
4364                 }
4365
4366         /* Check all signature algorithms are consistent with
4367          * signature algorithms extension if TLS 1.2 or later
4368          * and strict mode.
4369          */
4370         if (TLS1_get_version(s) >= TLS1_2_VERSION && strict_mode)
4371                 {
4372                 int default_nid;
4373                 unsigned char rsign = 0;
4374                 if (c->peer_sigalgs)
4375                         default_nid = 0;
4376                 /* If no sigalgs extension use defaults from RFC5246 */
4377                 else
4378                         {
4379                         switch(idx)
4380                                 {
4381                         case SSL_PKEY_RSA_ENC:
4382                         case SSL_PKEY_RSA_SIGN:
4383                         case SSL_PKEY_DH_RSA:
4384                                 rsign = TLSEXT_signature_rsa;
4385                                 default_nid = NID_sha1WithRSAEncryption;
4386                                 break;
4387
4388                         case SSL_PKEY_DSA_SIGN:
4389                         case SSL_PKEY_DH_DSA:
4390                                 rsign = TLSEXT_signature_dsa;
4391                                 default_nid = NID_dsaWithSHA1;
4392                                 break;
4393
4394                         case SSL_PKEY_ECC:
4395                                 rsign = TLSEXT_signature_ecdsa;
4396                                 default_nid = NID_ecdsa_with_SHA1;
4397                                 break;
4398
4399                         default:
4400                                 default_nid = -1;
4401                                 break;
4402                                 }
4403                         }
4404                 /* If peer sent no signature algorithms extension and we
4405                  * have set preferred signature algorithms check we support
4406                  * sha1.
4407                  */
4408                 if (default_nid > 0 && c->conf_sigalgs)
4409                         {
4410                         size_t j;
4411                         const unsigned char *p = c->conf_sigalgs;
4412                         for (j = 0; j < c->conf_sigalgslen; j += 2, p += 2)
4413                                 {
4414                                 if (p[0] == TLSEXT_hash_sha1 && p[1] == rsign)
4415                                         break;
4416                                 }
4417                         if (j == c->conf_sigalgslen)
4418                                 {
4419                                 if (check_flags)
4420                                         goto skip_sigs;
4421                                 else
4422                                         goto end;
4423                                 }
4424                         }
4425                 /* Check signature algorithm of each cert in chain */
4426                 if (!tls1_check_sig_alg(c, x, default_nid))
4427                         {
4428                         if (!check_flags) goto end;
4429                         }
4430                 else
4431                         rv |= CERT_PKEY_EE_SIGNATURE;
4432                 rv |= CERT_PKEY_CA_SIGNATURE;
4433                 for (i = 0; i < sk_X509_num(chain); i++)
4434                         {
4435                         if (!tls1_check_sig_alg(c, sk_X509_value(chain, i),
4436                                                         default_nid))
4437                                 {
4438                                 if (check_flags)
4439                                         {
4440                                         rv &= ~CERT_PKEY_CA_SIGNATURE;
4441                                         break;
4442                                         }
4443                                 else
4444                                         goto end;
4445                                 }
4446                         }
4447                 }
4448         /* Else not TLS 1.2, so mark EE and CA signing algorithms OK */
4449         else if(check_flags)
4450                 rv |= CERT_PKEY_EE_SIGNATURE|CERT_PKEY_CA_SIGNATURE;
4451         skip_sigs:
4452         /* Check cert parameters are consistent */
4453         if (tls1_check_cert_param(s, x, check_flags ? 1 : 2))
4454                 rv |= CERT_PKEY_EE_PARAM;
4455         else if (!check_flags)
4456                 goto end;
4457         if (!s->server)
4458                 rv |= CERT_PKEY_CA_PARAM;
4459         /* In strict mode check rest of chain too */
4460         else if (strict_mode)
4461                 {
4462                 rv |= CERT_PKEY_CA_PARAM;
4463                 for (i = 0; i < sk_X509_num(chain); i++)
4464                         {
4465                         X509 *ca = sk_X509_value(chain, i);
4466                         if (!tls1_check_cert_param(s, ca, 0))
4467                                 {
4468                                 if (check_flags)
4469                                         {
4470                                         rv &= ~CERT_PKEY_CA_PARAM;
4471                                         break;
4472                                         }
4473                                 else
4474                                         goto end;
4475                                 }
4476                         }
4477                 }
4478         if (!s->server && strict_mode)
4479                 {
4480                 STACK_OF(X509_NAME) *ca_dn;
4481                 int check_type = 0;
4482                 switch (pk->type)
4483                         {
4484                 case EVP_PKEY_RSA:
4485                         check_type = TLS_CT_RSA_SIGN;
4486                         break;
4487                 case EVP_PKEY_DSA:
4488                         check_type = TLS_CT_DSS_SIGN;
4489                         break;
4490                 case EVP_PKEY_EC:
4491                         check_type = TLS_CT_ECDSA_SIGN;
4492                         break;
4493                 case EVP_PKEY_DH:
4494                 case EVP_PKEY_DHX:
4495                                 {
4496                                 int cert_type = X509_certificate_type(x, pk);
4497                                 if (cert_type & EVP_PKS_RSA)
4498                                         check_type = TLS_CT_RSA_FIXED_DH;
4499                                 if (cert_type & EVP_PKS_DSA)
4500                                         check_type = TLS_CT_DSS_FIXED_DH;
4501                                 }
4502                         }
4503                 if (check_type)
4504                         {
4505                         const unsigned char *ctypes;
4506                         int ctypelen;
4507                         if (c->ctypes)
4508                                 {
4509                                 ctypes = c->ctypes;
4510                                 ctypelen = (int)c->ctype_num;
4511                                 }
4512                         else
4513                                 {
4514                                 ctypes = (unsigned char *)s->s3->tmp.ctype;
4515                                 ctypelen = s->s3->tmp.ctype_num;
4516                                 }
4517                         for (i = 0; i < ctypelen; i++)
4518                                 {
4519                                 if (ctypes[i] == check_type)
4520                                         {
4521                                         rv |= CERT_PKEY_CERT_TYPE;
4522                                         break;
4523                                         }
4524                                 }
4525                         if (!(rv & CERT_PKEY_CERT_TYPE) && !check_flags)
4526                                 goto end;
4527                         }
4528                 else
4529                         rv |= CERT_PKEY_CERT_TYPE;
4530
4531
4532                 ca_dn = s->s3->tmp.ca_names;
4533
4534                 if (!sk_X509_NAME_num(ca_dn))
4535                         rv |= CERT_PKEY_ISSUER_NAME;
4536
4537                 if (!(rv & CERT_PKEY_ISSUER_NAME))
4538                         {
4539                         if (ssl_check_ca_name(ca_dn, x))
4540                                 rv |= CERT_PKEY_ISSUER_NAME;
4541                         }
4542                 if (!(rv & CERT_PKEY_ISSUER_NAME))
4543                         {
4544                         for (i = 0; i < sk_X509_num(chain); i++)
4545                                 {
4546                                 X509 *xtmp = sk_X509_value(chain, i);
4547                                 if (ssl_check_ca_name(ca_dn, xtmp))
4548                                         {
4549                                         rv |= CERT_PKEY_ISSUER_NAME;
4550                                         break;
4551                                         }
4552                                 }
4553                         }
4554                 if (!check_flags && !(rv & CERT_PKEY_ISSUER_NAME))
4555                         goto end;
4556                 }
4557         else
4558                 rv |= CERT_PKEY_ISSUER_NAME|CERT_PKEY_CERT_TYPE;
4559
4560         if (!check_flags || (rv & check_flags) == check_flags)
4561                 rv |= CERT_PKEY_VALID;
4562
4563         end:
4564
4565         if (TLS1_get_version(s) >= TLS1_2_VERSION)
4566                 {
4567                 if (cpk->valid_flags & CERT_PKEY_EXPLICIT_SIGN)
4568                         rv |= CERT_PKEY_EXPLICIT_SIGN|CERT_PKEY_SIGN;
4569                 else if (cpk->digest)
4570                         rv |= CERT_PKEY_SIGN;
4571                 }
4572         else
4573                 rv |= CERT_PKEY_SIGN|CERT_PKEY_EXPLICIT_SIGN;
4574
4575         /* When checking a CERT_PKEY structure all flags are irrelevant
4576          * if the chain is invalid.
4577          */
4578         if (!check_flags)
4579                 {
4580                 if (rv & CERT_PKEY_VALID)
4581                         cpk->valid_flags = rv;
4582                 else
4583                         {
4584                         /* Preserve explicit sign flag, clear rest */
4585                         cpk->valid_flags &= CERT_PKEY_EXPLICIT_SIGN;
4586                         return 0;
4587                         }
4588                 }
4589         return rv;
4590         }
4591
4592 /* Set validity of certificates in an SSL structure */
4593 void tls1_set_cert_validity(SSL *s)
4594         {
4595         tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_RSA_ENC);
4596         tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_RSA_SIGN);
4597         tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_DSA_SIGN);
4598         tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_DH_RSA);
4599         tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_DH_DSA);
4600         tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_ECC);
4601         }
4602 /* User level utiity function to check a chain is suitable */
4603 int SSL_check_chain(SSL *s, X509 *x, EVP_PKEY *pk, STACK_OF(X509) *chain)
4604         {
4605         return tls1_check_chain(s, x, pk, chain, -1);
4606         }
4607
4608 #endif
4609
4610 #ifndef OPENSSL_NO_DH
4611 DH *ssl_get_auto_dh(SSL *s)
4612         {
4613         int dh_secbits = 80;
4614         if (s->cert->dh_tmp_auto == 2)
4615                 return DH_get_1024_160();
4616         if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
4617                 {
4618                 if (s->s3->tmp.new_cipher->strength_bits == 256)
4619                         dh_secbits = 128;
4620                 else
4621                         dh_secbits = 80;
4622                 }
4623         else
4624                 {
4625                 CERT_PKEY *cpk = ssl_get_server_send_pkey(s);
4626                 dh_secbits = EVP_PKEY_security_bits(cpk->privatekey);
4627                 }
4628
4629         if (dh_secbits >= 128)
4630                 {
4631                 DH *dhp = DH_new();
4632                 if (!dhp)
4633                         return NULL;
4634                 dhp->g = BN_new();
4635                 if (dhp->g)
4636                         BN_set_word(dhp->g, 2);
4637                 if (dh_secbits >= 192)
4638                         dhp->p = get_rfc3526_prime_8192(NULL);
4639                 else
4640                         dhp->p = get_rfc3526_prime_3072(NULL);
4641                 if (!dhp->p || !dhp->g)
4642                         {
4643                         DH_free(dhp);
4644                         return NULL;
4645                         }
4646                 return dhp;
4647                 }
4648         if (dh_secbits >= 112)
4649                 return DH_get_2048_224();
4650         return DH_get_1024_160();
4651         }
4652 #endif
4653
4654 static int ssl_security_cert_key(SSL *s, SSL_CTX *ctx, X509 *x, int op)
4655         {
4656         int secbits;
4657         EVP_PKEY *pkey = X509_get_pubkey(x);
4658         if (pkey)
4659                 {
4660                 secbits = EVP_PKEY_security_bits(pkey);
4661                 EVP_PKEY_free(pkey);
4662                 }
4663         else
4664                 secbits = -1;
4665         if (s)
4666                 return ssl_security(s, op, secbits, 0, x);
4667         else
4668                 return ssl_ctx_security(ctx, op, secbits, 0, x);
4669         }
4670
4671 static int ssl_security_cert_sig(SSL *s, SSL_CTX *ctx, X509 *x, int op)
4672         {
4673         /* Lookup signature algorithm digest */
4674         int secbits = -1, md_nid = NID_undef, sig_nid;
4675         sig_nid = X509_get_signature_nid(x);
4676         if (sig_nid && OBJ_find_sigid_algs(sig_nid, &md_nid, NULL))
4677                 {
4678                 const EVP_MD *md;
4679                 if (md_nid && (md = EVP_get_digestbynid(md_nid)))
4680                                 secbits = EVP_MD_size(md) * 4;
4681                 }
4682         if (s)
4683                 return ssl_security(s, op, secbits, md_nid, x);
4684         else
4685                 return ssl_ctx_security(ctx, op, secbits, md_nid, x);
4686         }
4687
4688 int ssl_security_cert(SSL *s, SSL_CTX *ctx, X509 *x, int vfy, int is_ee)
4689         {
4690         if (vfy)
4691                 vfy = SSL_SECOP_PEER;
4692         if (is_ee)
4693                 {
4694                 if (!ssl_security_cert_key(s, ctx, x, SSL_SECOP_EE_KEY | vfy))
4695                         return SSL_R_EE_KEY_TOO_SMALL;
4696                 }
4697         else
4698                 {
4699                 if (!ssl_security_cert_key(s, ctx, x, SSL_SECOP_CA_KEY | vfy))
4700                         return SSL_R_CA_KEY_TOO_SMALL;
4701                 }
4702         if (!ssl_security_cert_sig(s, ctx, x, SSL_SECOP_CA_MD | vfy))
4703                 return SSL_R_CA_MD_TOO_WEAK;
4704         return 1;
4705         }
4706
4707 /* Check security of a chain, if sk includes the end entity certificate
4708  * then x is NULL. If vfy is 1 then we are verifying a peer chain and
4709  * not sending one to the peer.
4710  * Return values: 1 if ok otherwise error code to use
4711  */
4712
4713 int ssl_security_cert_chain(SSL *s, STACK_OF(X509) *sk, X509 *x, int vfy)
4714         {
4715         int rv, start_idx, i;
4716         if (x == NULL)
4717                 {
4718                 x = sk_X509_value(sk, 0);
4719                 start_idx = 1;
4720                 }
4721         else
4722                 start_idx = 0;
4723
4724         rv = ssl_security_cert(s, NULL, x, vfy, 1);
4725         if (rv != 1)
4726                 return rv;
4727
4728         for (i = start_idx; i < sk_X509_num(sk); i++)
4729                 {
4730                 x = sk_X509_value(sk, i);
4731                 rv = ssl_security_cert(s, NULL, x, vfy, 0);
4732                 if (rv != 1)
4733                         return rv;
4734                 }
4735         return 1;
4736         }