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