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/*
* Copyright (C) 2021 The Android Open Source Project
*
* 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 <fstream>
#include "keymaster4_common.h"
namespace android::hardware::keymaster::V4_0::fuzzer {
constexpr size_t kMaxVectorSize = 100;
constexpr size_t kMaxKeyParameter = 10;
constexpr Tag kTagArray[] = {Tag::INVALID,
Tag::PURPOSE,
Tag::ALGORITHM,
Tag::KEY_SIZE,
Tag::BLOCK_MODE,
Tag::DIGEST,
Tag::PADDING,
Tag::CALLER_NONCE,
Tag::MIN_MAC_LENGTH,
Tag::EC_CURVE,
Tag::RSA_PUBLIC_EXPONENT,
Tag::INCLUDE_UNIQUE_ID,
Tag::BLOB_USAGE_REQUIREMENTS,
Tag::BOOTLOADER_ONLY,
Tag::ROLLBACK_RESISTANCE,
Tag::HARDWARE_TYPE,
Tag::ACTIVE_DATETIME,
Tag::ORIGINATION_EXPIRE_DATETIME,
Tag::USAGE_EXPIRE_DATETIME,
Tag::MIN_SECONDS_BETWEEN_OPS,
Tag::MAX_USES_PER_BOOT,
Tag::USER_ID,
Tag::USER_SECURE_ID,
Tag::NO_AUTH_REQUIRED,
Tag::USER_AUTH_TYPE,
Tag::AUTH_TIMEOUT,
Tag::ALLOW_WHILE_ON_BODY,
Tag::TRUSTED_USER_PRESENCE_REQUIRED,
Tag::TRUSTED_CONFIRMATION_REQUIRED,
Tag::UNLOCKED_DEVICE_REQUIRED,
Tag::APPLICATION_ID,
Tag::APPLICATION_DATA,
Tag::CREATION_DATETIME,
Tag::ORIGIN,
Tag::ROOT_OF_TRUST,
Tag::OS_VERSION,
Tag::OS_PATCHLEVEL,
Tag::UNIQUE_ID,
Tag::ATTESTATION_CHALLENGE,
Tag::ATTESTATION_APPLICATION_ID,
Tag::ATTESTATION_ID_BRAND,
Tag::ATTESTATION_ID_DEVICE,
Tag::ATTESTATION_ID_PRODUCT,
Tag::ATTESTATION_ID_SERIAL,
Tag::ATTESTATION_ID_IMEI,
Tag::ATTESTATION_ID_MEID,
Tag::ATTESTATION_ID_MANUFACTURER,
Tag::ATTESTATION_ID_MODEL,
Tag::VENDOR_PATCHLEVEL,
Tag::BOOT_PATCHLEVEL,
Tag::ASSOCIATED_DATA,
Tag::NONCE,
Tag::MAC_LENGTH,
Tag::RESET_SINCE_ID_ROTATION,
Tag::CONFIRMATION_TOKEN};
class KeyMaster4AuthSetFuzzer {
public:
void process(const uint8_t* data, size_t size);
private:
void invokeAuthSetAPIs();
std::unique_ptr<FuzzedDataProvider> mFdp = nullptr;
};
/**
* @brief invokeAuthSetAPIs() function aims at calling functions of authorization_set.cpp
* and authorization_set.h in order to get a good coverage for libkeymaster4support.
*/
void KeyMaster4AuthSetFuzzer::invokeAuthSetAPIs() {
AuthorizationSet authSet = createAuthorizationSet(mFdp);
while (mFdp->remaining_bytes() > 0) {
uint32_t action = mFdp->ConsumeIntegralInRange<uint32_t>(0, 15);
switch (action) {
case 0: {
authSet.Sort();
} break;
case 1: {
authSet.Deduplicate();
} break;
case 2: {
authSet.Union(createAuthorizationSet(mFdp));
} break;
case 3: {
authSet.Subtract(createAuthorizationSet(mFdp));
} break;
case 4: {
std::filebuf fbOut;
fbOut.open("/dev/zero", std::ios::out);
std::ostream out(&fbOut);
authSet.Serialize(&out);
} break;
case 5: {
std::filebuf fbIn;
fbIn.open("/dev/zero", std::ios::in);
std::istream in(&fbIn);
authSet.Deserialize(&in);
} break;
case 6: { // invoke push_back()
AuthorizationSetBuilder builder = AuthorizationSetBuilder();
for (const KeyParameter& tag : authSet) {
builder.push_back(tag);
}
AuthorizationSet params = createAuthorizationSet(mFdp);
authSet.push_back(params);
} break;
case 7: { // invoke copy constructor
auto params = AuthorizationSetBuilder().Authorizations(authSet);
authSet = params;
} break;
case 8: { // invoke move constructor
auto params = AuthorizationSetBuilder().Authorizations(authSet);
authSet = std::move(params);
} break;
case 9: { // invoke Constructor from hidl_vec<KeyParameter>
hidl_vec<KeyParameter> keyParam;
size_t numKeyParam = mFdp->ConsumeIntegralInRange<size_t>(1, kMaxKeyParameter);
keyParam.resize(numKeyParam);
for (size_t i = 0; i < numKeyParam - 1; ++i) {
keyParam[i].tag = mFdp->PickValueInArray(kTagArray);
std::vector<uint8_t> dataVector = mFdp->ConsumeBytes<uint8_t>(
mFdp->ConsumeIntegralInRange<size_t>(0, kMaxVectorSize));
keyParam[i].blob = dataVector;
}
if (mFdp->ConsumeBool()) {
AuthorizationSet auths(keyParam);
auths.push_back(AuthorizationSet(keyParam));
} else { // invoke operator=
AuthorizationSet auths = keyParam;
}
} break;
case 10: { // invoke 'Contains()'
Tag tag;
if (authSet.size() > 0) {
tag = authSet[mFdp->ConsumeIntegralInRange<size_t>(0, authSet.size() - 1)].tag;
}
authSet.Contains(mFdp->ConsumeBool() ? tag : mFdp->PickValueInArray(kTagArray));
} break;
case 11: { // invoke 'GetTagCount()'
Tag tag;
if (authSet.size() > 0) {
tag = authSet[mFdp->ConsumeIntegralInRange<size_t>(0, authSet.size() - 1)].tag;
}
authSet.GetTagCount(mFdp->ConsumeBool() ? tag : mFdp->PickValueInArray(kTagArray));
} break;
case 12: { // invoke 'empty()'
authSet.empty();
} break;
case 13: { // invoke 'data()'
authSet.data();
} break;
case 14: { // invoke 'hidl_data()'
authSet.hidl_data();
} break;
case 15: { // invoke 'erase()'
if (authSet.size() > 0) {
authSet.erase(mFdp->ConsumeIntegralInRange<size_t>(0, authSet.size() - 1));
}
} break;
default:
break;
};
}
authSet.Clear();
}
void KeyMaster4AuthSetFuzzer::process(const uint8_t* data, size_t size) {
mFdp = std::make_unique<FuzzedDataProvider>(data, size);
invokeAuthSetAPIs();
}
extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
KeyMaster4AuthSetFuzzer km4AuthSetFuzzer;
km4AuthSetFuzzer.process(data, size);
return 0;
}
} // namespace android::hardware::keymaster::V4_0::fuzzer
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