contrib/bearssl/src/ssl/ssl_server_full_ec.c

   1 /*
   2  * Copyright (c) 2016 Thomas Pornin <pornin@bolet.org>
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining
   5  * a copy of this software and associated documentation files (the
   6  * "Software"), to deal in the Software without restriction, including
   7  * without limitation the rights to use, copy, modify, merge, publish,
   8  * distribute, sublicense, and/or sell copies of the Software, and to
   9  * permit persons to whom the Software is furnished to do so, subject to
  10  * the following conditions:
  11  *
  12  * The above copyright notice and this permission notice shall be
  13  * included in all copies or substantial portions of the Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  16  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  17  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  18  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  19  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  20  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  21  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  22  * SOFTWARE.
  23  */
  24
  25 #include "inner.h"
  26
  27 /* see bearssl_ssl.h */
  28 void
  29 br_ssl_server_init_full_ec(br_ssl_server_context *cc,
  30         const br_x509_certificate *chain, size_t chain_len,
  31         unsigned cert_issuer_key_type, const br_ec_private_key *sk)
  32 {
  33         /*
  34          * The "full" profile supports all implemented cipher suites.
  35          *
  36          * Rationale for suite order, from most important to least
  37          * important rule:
  38          *
  39          * -- Don't use 3DES if AES is available.
  40          * -- Try to have Forward Secrecy (ECDHE suite) if possible.
  41          * -- ChaCha20+Poly1305 is better than AES/GCM (faster, smaller).
  42          * -- GCM is better than CCM and CBC. CCM is better than CBC.
  43          * -- CCM is better than CCM_8.
  44          * -- AES-128 is preferred over AES-256 (AES-128 is already
  45          *    strong enough, and AES-256 is 40% more expensive).
  46          *
  47          * Note that for ECDH suites, the list will be automatically
  48          * filtered based on the issuing CA key type.
  49          */
  50         static const uint16_t suites[] = {
  51                 BR_TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256,
  52                 BR_TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
  53                 BR_TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,
  54                 BR_TLS_ECDHE_ECDSA_WITH_AES_128_CCM,
  55                 BR_TLS_ECDHE_ECDSA_WITH_AES_256_CCM,
  56                 BR_TLS_ECDHE_ECDSA_WITH_AES_128_CCM_8,
  57                 BR_TLS_ECDHE_ECDSA_WITH_AES_256_CCM_8,
  58                 BR_TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256,
  59                 BR_TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384,
  60                 BR_TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA,
  61                 BR_TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA,
  62                 BR_TLS_ECDH_ECDSA_WITH_AES_128_GCM_SHA256,
  63                 BR_TLS_ECDH_RSA_WITH_AES_128_GCM_SHA256,
  64                 BR_TLS_ECDH_ECDSA_WITH_AES_256_GCM_SHA384,
  65                 BR_TLS_ECDH_RSA_WITH_AES_256_GCM_SHA384,
  66                 BR_TLS_ECDH_ECDSA_WITH_AES_128_CBC_SHA256,
  67                 BR_TLS_ECDH_RSA_WITH_AES_128_CBC_SHA256,
  68                 BR_TLS_ECDH_ECDSA_WITH_AES_256_CBC_SHA384,
  69                 BR_TLS_ECDH_RSA_WITH_AES_256_CBC_SHA384,
  70                 BR_TLS_ECDH_ECDSA_WITH_AES_128_CBC_SHA,
  71                 BR_TLS_ECDH_RSA_WITH_AES_128_CBC_SHA,
  72                 BR_TLS_ECDH_ECDSA_WITH_AES_256_CBC_SHA,
  73                 BR_TLS_ECDH_RSA_WITH_AES_256_CBC_SHA,
  74                 BR_TLS_ECDHE_ECDSA_WITH_3DES_EDE_CBC_SHA,
  75                 BR_TLS_ECDH_ECDSA_WITH_3DES_EDE_CBC_SHA,
  76                 BR_TLS_ECDH_RSA_WITH_3DES_EDE_CBC_SHA
  77         };
  78
  79         /*
  80          * All hash functions are activated.
  81          * Note: the X.509 validation engine will nonetheless refuse to
  82          * validate signatures that use MD5 as hash function.
  83          */
  84         static const br_hash_class *hashes[] = {
  85                 &br_md5_vtable,
  86                 &br_sha1_vtable,
  87                 &br_sha224_vtable,
  88                 &br_sha256_vtable,
  89                 &br_sha384_vtable,
  90                 &br_sha512_vtable
  91         };
  92
  93         int id;
  94
  95         /*
  96          * Reset server context and set supported versions from TLS-1.0
  97          * to TLS-1.2 (inclusive).
  98          */
  99         br_ssl_server_zero(cc);
 100         br_ssl_engine_set_versions(&cc->eng, BR_TLS10, BR_TLS12);
 101
 102         /*
 103          * Set suites and elliptic curve implementation (for ECDHE).
 104          */
 105         br_ssl_engine_set_suites(&cc->eng, suites,
 106                 (sizeof suites) / (sizeof suites[0]));
 107         br_ssl_engine_set_default_ec(&cc->eng);
 108
 109         /*
 110          * Set the "server policy": handler for the certificate chain
 111          * and private key operations.
 112          */
 113         br_ssl_server_set_single_ec(cc, chain, chain_len, sk,
 114                 BR_KEYTYPE_KEYX | BR_KEYTYPE_SIGN,
 115                 cert_issuer_key_type,
 116                 br_ssl_engine_get_ec(&cc->eng),
 117 #if BR_LOMUL
 118                 br_ecdsa_i15_sign_asn1
 119 #else
 120                 br_ecdsa_i31_sign_asn1
 121 #endif
 122         );
 123
 124         /*
 125          * Set supported hash functions.
 126          */
 127         for (id = br_md5_ID; id <= br_sha512_ID; id ++) {
 128                 const br_hash_class *hc;
 129
 130                 hc = hashes[id - 1];
 131                 br_ssl_engine_set_hash(&cc->eng, id, hc);
 132         }
 133
 134         /*
 135          * Set the PRF implementations.
 136          */
 137         br_ssl_engine_set_prf10(&cc->eng, &br_tls10_prf);
 138         br_ssl_engine_set_prf_sha256(&cc->eng, &br_tls12_sha256_prf);
 139         br_ssl_engine_set_prf_sha384(&cc->eng, &br_tls12_sha384_prf);
 140
 141         /*
 142          * Symmetric encryption.
 143          */
 144         br_ssl_engine_set_default_aes_cbc(&cc->eng);
 145         br_ssl_engine_set_default_aes_ccm(&cc->eng);
 146         br_ssl_engine_set_default_aes_gcm(&cc->eng);
 147         br_ssl_engine_set_default_des_cbc(&cc->eng);
 148         br_ssl_engine_set_default_chapol(&cc->eng);
 149 }