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/* vim: set tabstop=8 shiftwidth=4 softtabstop=4 expandtab smarttab colorcolumn=80: */
/*
* Copyright 2016 Red Hat, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "misc.h"
#include "../hooks.h"
#include <jose/openssl.h>
#include <string.h>
/* The following functions are from OpenSSL 3 code base:
* - bn_is_three()
* - check_public_exponent() is ossl_rsa_check_public_exponent(), with
* a minor change -- no FIPS check for allowing RSA_3. */
static int bn_is_three(const BIGNUM *bn)
{
BIGNUM *num = BN_dup(bn);
int ret = (num != NULL && BN_sub_word(num, 3) && BN_is_zero(num));
BN_free(num);
return ret;
}
/* Check exponent is odd, and has a bitlen ranging from [17..256]
* In practice, it allows odd integers greater than or equal to 65537. 3 is
* also allowed, for legacy purposes. */
static int check_public_exponent(const BIGNUM* e)
{
int bitlen;
/* In OpenSSL 3, RSA_3 is allowed in non-FIPS mode only, for
* legacy purposes. */
if (bn_is_three(e)) {
return 1;
}
bitlen = BN_num_bits(e);
return (BN_is_odd(e) && bitlen > 16 && bitlen < 257);
}
static RSA *
mkrsa(const json_t *jwk)
{
openssl_auto(BIGNUM) *bn = NULL;
json_auto_t *exp = NULL;
RSA *key = NULL;
int bits = 2048;
if (json_unpack((json_t *) jwk, "{s?i,s?O}",
"bits", &bits, "e", &exp) == -1)
return NULL;
if (bits < 2048)
return NULL;
if (!exp)
exp = json_integer(65537);
switch (exp ? exp->type : JSON_NULL) {
case JSON_STRING:
bn = bn_decode_json(exp);
if (!bn)
return NULL;
break;
case JSON_INTEGER:
bn = BN_new();
if (!bn)
return NULL;
if (BN_set_word(bn, json_integer_value(exp)) <= 0)
return NULL;
break;
default:
break;
}
if (!check_public_exponent(bn)) {
return NULL;
}
key = RSA_new();
if (!key)
return NULL;
bits = RSA_generate_key_ex(key, bits, bn, NULL);
if (bits <= 0) {
RSA_free(key);
key = NULL;
}
return key;
}
static bool
jwk_make_handles(jose_cfg_t *cfg, const json_t *jwk)
{
const char *kty = NULL;
if (json_unpack((json_t *) jwk, "{s:s}", "kty", &kty) == -1)
return false;
return strcmp(kty, "RSA") == 0;
}
static bool
jwk_make_execute(jose_cfg_t *cfg, json_t *jwk)
{
json_auto_t *key = NULL;
RSA *rsa = NULL;
if (!jwk_make_handles(cfg, jwk))
return false;
rsa = mkrsa(jwk);
if (!rsa)
return false;
key = jose_openssl_jwk_from_RSA(cfg, rsa);
RSA_free(rsa);
if (!key)
return false;
if (json_object_get(jwk, "bits") && json_object_del(jwk, "bits") < 0)
return false;
if (json_object_get(jwk, "e") && json_object_del(jwk, "e") < 0)
return false;
/* The "oth" parameter is optional. */
copy_val(key, jwk, "oth");
return copy_val(key, jwk, "n", "e", "p", "d", "q", "dp", "dq", "qi", NULL);
}
static void __attribute__((constructor))
constructor(void)
{
static jose_hook_jwk_t jwk = {
.kind = JOSE_HOOK_JWK_KIND_MAKE,
.make.handles = jwk_make_handles,
.make.execute = jwk_make_execute
};
jose_hook_jwk_push(&jwk);
}
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