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/*
* Copyright (c) 2016 Thomas Pornin <pornin@bolet.org>
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include "inner.h"
static int
sr_choose(const br_ssl_server_policy_class **pctx,
const br_ssl_server_context *cc,
br_ssl_server_choices *choices)
{
br_ssl_server_policy_rsa_context *pc;
const br_suite_translated *st;
size_t u, st_num;
unsigned hash_id;
int fh;
pc = (br_ssl_server_policy_rsa_context *)pctx;
st = br_ssl_server_get_client_suites(cc, &st_num);
if (cc->eng.session.version < BR_TLS12) {
hash_id = 0;
fh = 1;
} else {
hash_id = br_ssl_choose_hash(
br_ssl_server_get_client_hashes(cc));
fh = (hash_id != 0);
}
choices->chain = pc->chain;
choices->chain_len = pc->chain_len;
for (u = 0; u < st_num; u ++) {
unsigned tt;
tt = st[u][1];
switch (tt >> 12) {
case BR_SSLKEYX_RSA:
if ((pc->allowed_usages & BR_KEYTYPE_KEYX) != 0) {
choices->cipher_suite = st[u][0];
return 1;
}
break;
case BR_SSLKEYX_ECDHE_RSA:
if ((pc->allowed_usages & BR_KEYTYPE_SIGN) != 0 && fh) {
choices->cipher_suite = st[u][0];
choices->algo_id = hash_id + 0xFF00;
return 1;
}
break;
}
}
return 0;
}
static uint32_t
sr_do_keyx(const br_ssl_server_policy_class **pctx,
unsigned char *data, size_t *len)
{
br_ssl_server_policy_rsa_context *pc;
pc = (br_ssl_server_policy_rsa_context *)pctx;
return br_rsa_ssl_decrypt(pc->irsacore, pc->sk, data, *len);
}
/*
* OID for hash functions in RSA signatures.
*/
static const unsigned char HASH_OID_SHA1[] = {
0x05, 0x2B, 0x0E, 0x03, 0x02, 0x1A
};
static const unsigned char HASH_OID_SHA224[] = {
0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x04
};
static const unsigned char HASH_OID_SHA256[] = {
0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x01
};
static const unsigned char HASH_OID_SHA384[] = {
0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x02
};
static const unsigned char HASH_OID_SHA512[] = {
0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x03
};
static const unsigned char *HASH_OID[] = {
HASH_OID_SHA1,
HASH_OID_SHA224,
HASH_OID_SHA256,
HASH_OID_SHA384,
HASH_OID_SHA512
};
static size_t
sr_do_sign(const br_ssl_server_policy_class **pctx,
unsigned algo_id, unsigned char *data, size_t hv_len, size_t len)
{
br_ssl_server_policy_rsa_context *pc;
unsigned char hv[64];
size_t sig_len;
const unsigned char *hash_oid;
pc = (br_ssl_server_policy_rsa_context *)pctx;
memcpy(hv, data, hv_len);
algo_id &= 0xFF;
if (algo_id == 0) {
hash_oid = NULL;
} else if (algo_id >= 2 && algo_id <= 6) {
hash_oid = HASH_OID[algo_id - 2];
} else {
return 0;
}
sig_len = (pc->sk->n_bitlen + 7) >> 3;
if (len < sig_len) {
return 0;
}
return pc->irsasign(hash_oid, hv, hv_len, pc->sk, data) ? sig_len : 0;
}
static const br_ssl_server_policy_class sr_policy_vtable = {
sizeof(br_ssl_server_policy_rsa_context),
sr_choose,
sr_do_keyx,
sr_do_sign
};
/* see bearssl_ssl.h */
void
br_ssl_server_set_single_rsa(br_ssl_server_context *cc,
const br_x509_certificate *chain, size_t chain_len,
const br_rsa_private_key *sk, unsigned allowed_usages,
br_rsa_private irsacore, br_rsa_pkcs1_sign irsasign)
{
cc->chain_handler.single_rsa.vtable = &sr_policy_vtable;
cc->chain_handler.single_rsa.chain = chain;
cc->chain_handler.single_rsa.chain_len = chain_len;
cc->chain_handler.single_rsa.sk = sk;
cc->chain_handler.single_rsa.allowed_usages = allowed_usages;
cc->chain_handler.single_rsa.irsacore = irsacore;
cc->chain_handler.single_rsa.irsasign = irsasign;
cc->policy_vtable = &cc->chain_handler.single_rsa.vtable;
}
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