_ Git - BearSSL/blob - src/ssl/ssl_scert_single_rsa.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 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 }