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// Copyright (C) 2010 Internet Systems Consortium, Inc. ("ISC")
//
// Permission to use, copy, modify, and/or distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
// AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
// OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
// PERFORMANCE OF THIS SOFTWARE.
#include <map>
#include <utility>
#include <vector>
#include <exceptions/exceptions.h>
#include <crypto/crypto.h>
#include <dns/name.h>
#include <dns/util/base64.h>
#include <dns/tsigkey.h>
using namespace std;
namespace isc {
namespace dns {
struct
TSIGKey::TSIGKeyImpl {
TSIGKeyImpl(const Name& key_name, const Name& algorithm_name,
const void* secret, size_t secret_len) :
key_name_(key_name), algorithm_name_(algorithm_name),
secret_(static_cast<const uint8_t*>(secret),
static_cast<const uint8_t*>(secret) + secret_len)
{
// Convert the name to the canonical form.
algorithm_name_.downcase();
}
const Name key_name_;
Name algorithm_name_;
const vector<uint8_t> secret_;
};
TSIGKey::TSIGKey(const Name& key_name, const Name& algorithm_name,
const void* secret, size_t secret_len) : impl_(NULL)
{
if (algorithm_name != HMACMD5_NAME() &&
algorithm_name != HMACSHA1_NAME() &&
algorithm_name != HMACSHA256_NAME()) {
isc_throw(InvalidParameter, "Unknown TSIG algorithm is specified: " <<
algorithm_name);
}
if ((secret != NULL && secret_len == 0) ||
(secret == NULL && secret_len != 0)) {
isc_throw(InvalidParameter,
"TSIGKey secret and its length are inconsistent");
}
impl_ = new TSIGKeyImpl(key_name, algorithm_name, secret, secret_len);
}
TSIGKey::TSIGKey(const std::string& str) : impl_(NULL) {
const size_t pos = str.find(':');
if (pos == 0 || pos == str.npos || pos == str.size() - 1) {
// error
isc_throw(InvalidParameter, "Invalid TSIG key string");
}
try {
const Name key_name(str.substr(0, pos));
Name algo_name("hmac-md5.sig-alg.reg.int");
// optional algorithm part
size_t pos2 = str.find(':', pos + 1);
if (pos2 != str.npos) {
if (pos2 == pos + 1) {
isc_throw(InvalidParameter, "Invalid TSIG key string");
}
algo_name = Name(str.substr(pos2 + 1));
} else {
pos2 = str.size() - pos;
}
const std::string secret_str = str.substr(pos + 1, pos2 - pos - 1);
if (algo_name != HMACMD5_NAME() &&
algo_name != HMACSHA1_NAME() &&
algo_name != HMACSHA256_NAME()) {
isc_throw(InvalidParameter, "Unknown TSIG algorithm is specified: " <<
algo_name);
}
vector<uint8_t> secret;
decodeBase64(secret_str, secret);
impl_ = new TSIGKeyImpl(key_name, algo_name, &secret[0],
secret.size());
} catch (const Exception& e) {
// 'reduce' the several types of exceptions name parsing and
// Base64 decoding can throw to just the InvalidParameter
isc_throw(InvalidParameter, e.what());
}
}
TSIGKey::TSIGKey(const TSIGKey& source) : impl_(new TSIGKeyImpl(*source.impl_))
{}
TSIGKey&
TSIGKey::operator=(const TSIGKey& source) {
if (impl_ == source.impl_) {
return (*this);
}
TSIGKeyImpl* newimpl = new TSIGKeyImpl(*source.impl_);
delete impl_;
impl_ = newimpl;
return (*this);
}
TSIGKey::~TSIGKey() {
delete impl_;
}
const Name&
TSIGKey::getKeyName() const {
return (impl_->key_name_);
}
const Name&
TSIGKey::getAlgorithmName() const {
return (impl_->algorithm_name_);
}
const void*
TSIGKey::getSecret() const {
return ((impl_->secret_.size() > 0) ? &impl_->secret_[0] : NULL);
}
size_t
TSIGKey::getSecretLength() const {
return (impl_->secret_.size());
}
std::string
TSIGKey::toText() const {
const vector<uint8_t> secret_v(static_cast<const uint8_t*>(getSecret()),
static_cast<const uint8_t*>(getSecret()) +
getSecretLength());
std::string secret_str = encodeBase64(secret_v);
return (getKeyName().toText() + ":" + secret_str + ":" +
getAlgorithmName().toText());
}
const
Name& TSIGKey::HMACMD5_NAME() {
static Name alg_name("hmac-md5.sig-alg.reg.int");
return (alg_name);
}
const
Name& TSIGKey::HMACSHA1_NAME() {
static Name alg_name("hmac-sha1");
return (alg_name);
}
const
Name& TSIGKey::HMACSHA256_NAME() {
static Name alg_name("hmac-sha256");
return (alg_name);
}
struct TSIGKeyRing::TSIGKeyRingImpl {
typedef map<Name, TSIGKey> TSIGKeyMap;
typedef pair<Name, TSIGKey> NameAndKey;
TSIGKeyMap keys;
};
TSIGKeyRing::TSIGKeyRing() : impl_(new TSIGKeyRingImpl) {
}
TSIGKeyRing::~TSIGKeyRing() {
delete impl_;
}
unsigned int
TSIGKeyRing::size() const {
return (impl_->keys.size());
}
TSIGKeyRing::Result
TSIGKeyRing::add(const TSIGKey& key) {
if (impl_->keys.insert(
TSIGKeyRingImpl::NameAndKey(key.getKeyName(), key)).second
== true) {
return (SUCCESS);
} else {
return (EXIST);
}
}
TSIGKeyRing::Result
TSIGKeyRing::remove(const Name& key_name) {
return (impl_->keys.erase(key_name) == 1 ? SUCCESS : NOTFOUND);
}
TSIGKeyRing::FindResult
TSIGKeyRing::find(const Name& key_name) {
TSIGKeyRingImpl::TSIGKeyMap::const_iterator found =
impl_->keys.find(key_name);
if (found == impl_->keys.end()) {
return (FindResult(NOTFOUND, NULL));
}
return (FindResult(SUCCESS, &((*found).second)));
}
} // namespace dns
} // namespace isc
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