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