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// Copyright (c) 2023-present The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include <addresstype.h>
#include <chainparams.h>
#include <coins.h>
#include <key.h>
#include <primitives/transaction.h>
#include <psbt.h>
#include <script/descriptor.h>
#include <script/interpreter.h>
#include <script/script.h>
#include <script/signingprovider.h>
#include <sync.h>
#include <test/fuzz/FuzzedDataProvider.h>
#include <test/fuzz/fuzz.h>
#include <test/fuzz/util.h>
#include <test/fuzz/util/descriptor.h>
#include <test/util/setup_common.h>
#include <util/check.h>
#include <util/translation.h>
#include <validation.h>
#include <wallet/scriptpubkeyman.h>
#include <wallet/test/util.h>
#include <wallet/types.h>
#include <wallet/wallet.h>
#include <wallet/walletutil.h>
#include <map>
#include <memory>
#include <optional>
#include <string>
#include <utility>
#include <variant>
namespace wallet {
namespace {
const TestingSetup* g_setup;
//! The converter of mocked descriptors, needs to be initialized when the target is.
MockedDescriptorConverter MOCKED_DESC_CONVERTER;
void initialize_spkm()
{
static const auto testing_setup{MakeNoLogFileContext<const TestingSetup>()};
g_setup = testing_setup.get();
SelectParams(ChainType::MAIN);
MOCKED_DESC_CONVERTER.Init();
}
/**
* Key derivation is expensive. Deriving deep derivation paths take a lot of compute and we'd rather spend time
* elsewhere in this target, like on actually fuzzing the DescriptorScriptPubKeyMan. So rule out strings which could
* correspond to a descriptor containing a too large derivation path.
*/
static bool TooDeepDerivPath(std::string_view desc)
{
const FuzzBufferType desc_buf{reinterpret_cast<const unsigned char *>(desc.data()), desc.size()};
return HasDeepDerivPath(desc_buf);
}
static std::optional<std::pair<WalletDescriptor, FlatSigningProvider>> CreateWalletDescriptor(FuzzedDataProvider& fuzzed_data_provider)
{
const std::string mocked_descriptor{fuzzed_data_provider.ConsumeRandomLengthString()};
if (TooDeepDerivPath(mocked_descriptor)) return {};
const auto desc_str{MOCKED_DESC_CONVERTER.GetDescriptor(mocked_descriptor)};
if (!desc_str.has_value()) return std::nullopt;
FlatSigningProvider keys;
std::string error;
std::unique_ptr<Descriptor> parsed_desc{Parse(desc_str.value(), keys, error, false)};
if (!parsed_desc) return std::nullopt;
WalletDescriptor w_desc{std::move(parsed_desc), /*creation_time=*/0, /*range_start=*/0, /*range_end=*/1, /*next_index=*/1};
return std::make_pair(w_desc, keys);
}
static DescriptorScriptPubKeyMan* CreateDescriptor(WalletDescriptor& wallet_desc, FlatSigningProvider& keys, CWallet& keystore)
{
LOCK(keystore.cs_wallet);
keystore.AddWalletDescriptor(wallet_desc, keys, /*label=*/"", /*internal=*/false);
return keystore.GetDescriptorScriptPubKeyMan(wallet_desc);
};
FUZZ_TARGET(scriptpubkeyman, .init = initialize_spkm)
{
FuzzedDataProvider fuzzed_data_provider{buffer.data(), buffer.size()};
const auto& node{g_setup->m_node};
Chainstate& chainstate{node.chainman->ActiveChainstate()};
std::unique_ptr<CWallet> wallet_ptr{std::make_unique<CWallet>(node.chain.get(), "", CreateMockableWalletDatabase())};
CWallet& wallet{*wallet_ptr};
{
LOCK(wallet.cs_wallet);
wallet.SetWalletFlag(WALLET_FLAG_DESCRIPTORS);
wallet.SetLastBlockProcessed(chainstate.m_chain.Height(), chainstate.m_chain.Tip()->GetBlockHash());
}
auto wallet_desc{CreateWalletDescriptor(fuzzed_data_provider)};
if (!wallet_desc.has_value()) return;
auto spk_manager{CreateDescriptor(wallet_desc->first, wallet_desc->second, wallet)};
if (spk_manager == nullptr) return;
bool good_data{true};
LIMITED_WHILE(good_data && fuzzed_data_provider.ConsumeBool(), 300) {
CallOneOf(
fuzzed_data_provider,
[&] {
auto wallet_desc{CreateWalletDescriptor(fuzzed_data_provider)};
if (!wallet_desc.has_value()) {
good_data = false;
return;
}
std::string error;
if (spk_manager->CanUpdateToWalletDescriptor(wallet_desc->first, error)) {
auto new_spk_manager{CreateDescriptor(wallet_desc->first, wallet_desc->second, wallet)};
if (new_spk_manager != nullptr) spk_manager = new_spk_manager;
}
},
[&] {
const CScript script{ConsumeScript(fuzzed_data_provider)};
auto is_mine{spk_manager->IsMine(script)};
if (is_mine == isminetype::ISMINE_SPENDABLE) {
assert(spk_manager->GetScriptPubKeys().count(script));
}
},
[&] {
auto spks{spk_manager->GetScriptPubKeys()};
for (const CScript& spk : spks) {
assert(spk_manager->IsMine(spk) == ISMINE_SPENDABLE);
CTxDestination dest;
bool extract_dest{ExtractDestination(spk, dest)};
if (extract_dest) {
const std::string msg{fuzzed_data_provider.ConsumeRandomLengthString()};
PKHash pk_hash{std::get_if<PKHash>(&dest) && fuzzed_data_provider.ConsumeBool() ?
*std::get_if<PKHash>(&dest) :
PKHash{ConsumeUInt160(fuzzed_data_provider)}};
std::string str_sig;
(void)spk_manager->SignMessage(msg, pk_hash, str_sig);
}
}
},
[&] {
CKey key{ConsumePrivateKey(fuzzed_data_provider, /*compressed=*/fuzzed_data_provider.ConsumeBool())};
if (!key.IsValid()) {
good_data = false;
return;
}
spk_manager->AddDescriptorKey(key, key.GetPubKey());
spk_manager->TopUp();
},
[&] {
std::string descriptor;
(void)spk_manager->GetDescriptorString(descriptor, /*priv=*/fuzzed_data_provider.ConsumeBool());
},
[&] {
LOCK(spk_manager->cs_desc_man);
auto wallet_desc{spk_manager->GetWalletDescriptor()};
if (wallet_desc.descriptor->IsSingleType()) {
auto output_type{wallet_desc.descriptor->GetOutputType()};
if (output_type.has_value()) {
auto dest{spk_manager->GetNewDestination(*output_type)};
if (dest) {
assert(IsValidDestination(*dest));
assert(spk_manager->IsHDEnabled());
}
}
}
},
[&] {
CMutableTransaction tx_to;
const std::optional<CMutableTransaction> opt_tx_to{ConsumeDeserializable<CMutableTransaction>(fuzzed_data_provider, TX_WITH_WITNESS)};
if (!opt_tx_to) {
good_data = false;
return;
}
tx_to = *opt_tx_to;
std::map<COutPoint, Coin> coins{ConsumeCoins(fuzzed_data_provider)};
const int sighash{fuzzed_data_provider.ConsumeIntegral<int>()};
std::map<int, bilingual_str> input_errors;
(void)spk_manager->SignTransaction(tx_to, coins, sighash, input_errors);
},
[&] {
std::optional<PartiallySignedTransaction> opt_psbt{ConsumeDeserializable<PartiallySignedTransaction>(fuzzed_data_provider)};
if (!opt_psbt) {
good_data = false;
return;
}
auto psbt{*opt_psbt};
const PrecomputedTransactionData txdata{PrecomputePSBTData(psbt)};
const int sighash_type{fuzzed_data_provider.ConsumeIntegralInRange<int>(0, 150)};
(void)spk_manager->FillPSBT(psbt, txdata, sighash_type, fuzzed_data_provider.ConsumeBool(), fuzzed_data_provider.ConsumeBool(), nullptr, fuzzed_data_provider.ConsumeBool());
}
);
}
}
} // namespace
} // namespace wallet
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