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 static int 28 sr_choose(const br_ssl_server_policy_class **pctx, 29 const br_ssl_server_context *cc, 30 br_ssl_server_choices *choices) 31 { 32 br_ssl_server_policy_rsa_context *pc; 33 const br_suite_translated *st; 34 size_t u, st_num; 35 unsigned hash_id; 36 int fh; 37 38 pc = (br_ssl_server_policy_rsa_context *)pctx; 39 st = br_ssl_server_get_client_suites(cc, &st_num); 40 if (cc->eng.session.version < BR_TLS12) { 41 hash_id = 0; 42 fh = 1; 43 } else { 44 hash_id = br_ssl_choose_hash( 45 br_ssl_server_get_client_hashes(cc)); 46 fh = (hash_id != 0); 47 } 48 choices->chain = pc->chain; 49 choices->chain_len = pc->chain_len; 50 for (u = 0; u < st_num; u ++) { 51 unsigned tt; 52 53 tt = st[u][1]; 54 switch (tt >> 12) { 55 case BR_SSLKEYX_RSA: 56 if ((pc->allowed_usages & BR_KEYTYPE_KEYX) != 0) { 57 choices->cipher_suite = st[u][0]; 58 return 1; 59 } 60 break; 61 case BR_SSLKEYX_ECDHE_RSA: 62 if ((pc->allowed_usages & BR_KEYTYPE_SIGN) != 0 && fh) { 63 choices->cipher_suite = st[u][0]; 64 choices->algo_id = hash_id + 0xFF00; 65 return 1; 66 } 67 break; 68 } 69 } 70 return 0; 71 } 72 73 static uint32_t 74 sr_do_keyx(const br_ssl_server_policy_class **pctx, 75 unsigned char *data, size_t *len) 76 { 77 br_ssl_server_policy_rsa_context *pc; 78 79 pc = (br_ssl_server_policy_rsa_context *)pctx; 80 return br_rsa_ssl_decrypt(pc->irsacore, pc->sk, data, *len); 81 } 82 83 /* 84 * OID for hash functions in RSA signatures. 85 */ 86 static const unsigned char HASH_OID_SHA1[] = { 87 0x05, 0x2B, 0x0E, 0x03, 0x02, 0x1A 88 }; 89 90 static const unsigned char HASH_OID_SHA224[] = { 91 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x04 92 }; 93 94 static const unsigned char HASH_OID_SHA256[] = { 95 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x01 96 }; 97 98 static const unsigned char HASH_OID_SHA384[] = { 99 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x02 100 }; 101 102 static const unsigned char HASH_OID_SHA512[] = { 103 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x03 104 }; 105 106 static const unsigned char *HASH_OID[] = { 107 HASH_OID_SHA1, 108 HASH_OID_SHA224, 109 HASH_OID_SHA256, 110 HASH_OID_SHA384, 111 HASH_OID_SHA512 112 }; 113 114 static size_t 115 sr_do_sign(const br_ssl_server_policy_class **pctx, 116 unsigned algo_id, unsigned char *data, size_t hv_len, size_t len) 117 { 118 br_ssl_server_policy_rsa_context *pc; 119 unsigned char hv[64]; 120 size_t sig_len; 121 const unsigned char *hash_oid; 122 123 pc = (br_ssl_server_policy_rsa_context *)pctx; 124 memcpy(hv, data, hv_len); 125 algo_id &= 0xFF; 126 if (algo_id == 0) { 127 hash_oid = NULL; 128 } else if (algo_id >= 2 && algo_id <= 6) { 129 hash_oid = HASH_OID[algo_id - 2]; 130 } else { 131 return 0; 132 } 133 sig_len = (pc->sk->n_bitlen + 7) >> 3; 134 if (len < sig_len) { 135 return 0; 136 } 137 return pc->irsasign(hash_oid, hv, hv_len, pc->sk, data) ? sig_len : 0; 138 } 139 140 static const br_ssl_server_policy_class sr_policy_vtable = { 141 sizeof(br_ssl_server_policy_rsa_context), 142 sr_choose, 143 sr_do_keyx, 144 sr_do_sign 145 }; 146 147 /* see bearssl_ssl.h */ 148 void 149 br_ssl_server_set_single_rsa(br_ssl_server_context *cc, 150 const br_x509_certificate *chain, size_t chain_len, 151 const br_rsa_private_key *sk, unsigned allowed_usages, 152 br_rsa_private irsacore, br_rsa_pkcs1_sign irsasign) 153 { 154 cc->chain_handler.single_rsa.vtable = &sr_policy_vtable; 155 cc->chain_handler.single_rsa.chain = chain; 156 cc->chain_handler.single_rsa.chain_len = chain_len; 157 cc->chain_handler.single_rsa.sk = sk; 158 cc->chain_handler.single_rsa.allowed_usages = allowed_usages; 159 cc->chain_handler.single_rsa.irsacore = irsacore; 160 cc->chain_handler.single_rsa.irsasign = irsasign; 161 cc->policy_vtable = &cc->chain_handler.single_rsa.vtable; 162 } 163