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/**
* Copyright (C) 2019-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#include "mongo/platform/basic.h"
#include <CommonCrypto/CommonCryptor.h>
#include <Security/Security.h>
#include <memory>
#include <set>
#include "mongo/base/init.h"
#include "mongo/base/status.h"
#include "mongo/crypto/symmetric_crypto.h"
#include "mongo/crypto/symmetric_key.h"
#include "mongo/platform/random.h"
#include "mongo/util/assert_util.h"
#include "mongo/util/str.h"
namespace mongo {
namespace crypto {
namespace {
template <typename Parent>
class SymmetricImplApple : public Parent {
public:
SymmetricImplApple(const SymmetricKey& key, aesMode mode, const uint8_t* iv, size_t ivLen)
: _ctx(nullptr, CCCryptorRelease) {
static_assert(
std::is_same<Parent, SymmetricEncryptor>::value ||
std::is_same<Parent, SymmetricDecryptor>::value,
"SymmetricImplApple must inherit from SymmetricEncryptor or SymmetricDecryptor");
uassert(ErrorCodes::UnsupportedFormat,
"Native crypto on this platform only supports AES256-CBC",
mode == aesMode::cbc);
// Note: AES256 uses a 256byte keysize,
// but is still functionally a 128bit block algorithm.
// Therefore we expect a 128 bit block length.
uassert(ErrorCodes::BadValue,
str::stream() << "Invalid ivlen for selected algorithm, expected "
<< kCCBlockSizeAES128
<< ", got "
<< ivLen,
ivLen == kCCBlockSizeAES128);
CCCryptorRef context = nullptr;
constexpr auto op =
std::is_same<Parent, SymmetricEncryptor>::value ? kCCEncrypt : kCCDecrypt;
const auto status = CCCryptorCreate(op,
kCCAlgorithmAES,
kCCOptionPKCS7Padding,
key.getKey(),
key.getKeySize(),
iv,
&context);
uassert(ErrorCodes::UnknownError,
str::stream() << "CCCryptorCreate failure: " << status,
status == kCCSuccess);
_ctx.reset(context);
}
StatusWith<size_t> update(const uint8_t* in, size_t inLen, uint8_t* out, size_t outLen) final {
size_t outUsed = 0;
const auto status = CCCryptorUpdate(_ctx.get(), in, inLen, out, outLen, &outUsed);
if (status != kCCSuccess) {
return Status(ErrorCodes::UnknownError,
str::stream() << "Unable to perform CCCryptorUpdate: " << status);
}
return outUsed;
}
Status addAuthenticatedData(const uint8_t* in, size_t inLen) final {
fassert(51128, inLen == 0);
return Status::OK();
}
StatusWith<size_t> finalize(uint8_t* out, size_t outLen) final {
size_t outUsed = 0;
const auto status = CCCryptorFinal(_ctx.get(), out, outLen, &outUsed);
if (status != kCCSuccess) {
return Status(ErrorCodes::UnknownError,
str::stream() << "Unable to perform CCCryptorFinal: " << status);
}
return outUsed;
}
private:
std::unique_ptr<_CCCryptor, decltype(&CCCryptorRelease)> _ctx;
};
class SymmetricEncryptorApple : public SymmetricImplApple<SymmetricEncryptor> {
public:
using SymmetricImplApple::SymmetricImplApple;
StatusWith<size_t> finalizeTag(uint8_t* out, size_t outLen) final {
// CBC only, no tag to create.
return 0;
}
};
class SymmetricDecryptorApple : public SymmetricImplApple<SymmetricDecryptor> {
public:
using SymmetricImplApple::SymmetricImplApple;
Status updateTag(const uint8_t* tag, size_t tagLen) final {
// CBC only, no tag to verify.
if (tagLen > 0) {
return {ErrorCodes::BadValue, "Unexpected tag for non-gcm cipher"};
}
return Status::OK();
}
};
} // namespace
std::set<std::string> getSupportedSymmetricAlgorithms() {
return {aes256CBCName};
}
Status engineRandBytes(uint8_t* buffer, size_t len) {
auto result = SecRandomCopyBytes(kSecRandomDefault, len, buffer);
if (result != errSecSuccess) {
return {ErrorCodes::UnknownError,
str::stream() << "Failed generating random bytes: " << result};
} else {
return Status::OK();
}
}
StatusWith<std::unique_ptr<SymmetricEncryptor>> SymmetricEncryptor::create(const SymmetricKey& key,
aesMode mode,
const uint8_t* iv,
size_t ivLen) try {
std::unique_ptr<SymmetricEncryptor> encryptor =
std::make_unique<SymmetricEncryptorApple>(key, mode, iv, ivLen);
return std::move(encryptor);
} catch (const DBException& e) {
return e.toStatus();
}
StatusWith<std::unique_ptr<SymmetricDecryptor>> SymmetricDecryptor::create(const SymmetricKey& key,
aesMode mode,
const uint8_t* iv,
size_t ivLen) try {
std::unique_ptr<SymmetricDecryptor> decryptor =
std::make_unique<SymmetricDecryptorApple>(key, mode, iv, ivLen);
return std::move(decryptor);
} catch (const DBException& e) {
return e.toStatus();
}
} // namespace crypto
} // namespace mongo
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