wallet: respect frozen key images in multisig wallets

Before this change, if a multisig peer asked you to sign a transaction with a frozen enote, the wallet will do it without any error or warning. This change makes it
so that wallets will refuse to sign multisig transactions with frozen enotes.

Disclaimer: This PR was generously funded by @LocalMonero.
This commit is contained in:
jeffro256 2023-06-12 01:30:38 -05:00
parent 94e67bf96b
commit 369a5a8f9a
3 changed files with 141 additions and 2 deletions

View file

@ -1732,6 +1732,36 @@ bool wallet2::frozen(size_t idx) const
return td.m_frozen; return td.m_frozen;
} }
//---------------------------------------------------------------------------------------------------- //----------------------------------------------------------------------------------------------------
bool wallet2::frozen(const multisig_tx_set& txs) const
{
// Each call to frozen(const key_image&) is O(N), so if we didn't use batching like we did here,
// this op would be O(M * N) instead of O(M + N). N = # wallet transfers, M = # key images in set.
// Step 1. Collect all key images from all pending txs into set
std::unordered_set<crypto::key_image> kis_to_sign;
for (const auto& ptx : txs.m_ptx)
{
const tools::wallet2::tx_construction_data& cd = ptx.construction_data;
CHECK_AND_ASSERT_THROW_MES(cd.sources.size() == ptx.tx.vin.size(), "mismatched multisg tx set source sizes");
for (size_t src_idx = 0; src_idx < cd.sources.size(); ++src_idx)
{
// Check that the key images are consistent between tx vin and construction data
const crypto::key_image multisig_ki = rct::rct2ki(cd.sources[src_idx].multisig_kLRki.ki);
CHECK_AND_ASSERT_THROW_MES(ptx.tx.vin[src_idx].type() == typeid(cryptonote::txin_to_key), "multisig tx cannot be miner");
const crypto::key_image vin_ki = boost::get<cryptonote::txin_to_key>(ptx.tx.vin[src_idx]).k_image;
CHECK_AND_ASSERT_THROW_MES(multisig_ki == vin_ki, "Mismatched key image b/t vin and construction data");
// Add key image to set
kis_to_sign.insert(multisig_ki);
}
}
// Step 2. Scan all transfers for frozen key images
for (const auto& td : m_transfers)
if (td.m_frozen && kis_to_sign.count(td.m_key_image))
return true;
return false;
}
//----------------------------------------------------------------------------------------------------
void wallet2::freeze(const crypto::key_image &ki) void wallet2::freeze(const crypto::key_image &ki)
{ {
freeze(get_transfer_details(ki)); freeze(get_transfer_details(ki));
@ -1752,8 +1782,13 @@ size_t wallet2::get_transfer_details(const crypto::key_image &ki) const
for (size_t idx = 0; idx < m_transfers.size(); ++idx) for (size_t idx = 0; idx < m_transfers.size(); ++idx)
{ {
const transfer_details &td = m_transfers[idx]; const transfer_details &td = m_transfers[idx];
if (td.m_key_image_known && td.m_key_image == ki) if (td.m_key_image == ki)
return idx; {
if (td.m_key_image_known)
return idx;
else if (td.m_key_image_partial)
CHECK_AND_ASSERT_THROW_MES(false, "Transfer detail lookups are not allowed for multisig partial key images");
}
} }
CHECK_AND_ASSERT_THROW_MES(false, "Key image not found"); CHECK_AND_ASSERT_THROW_MES(false, "Key image not found");
} }
@ -7377,6 +7412,8 @@ bool wallet2::sign_multisig_tx(multisig_tx_set &exported_txs, std::vector<crypto
error::wallet_internal_error, "Transaction was signed by too many signers"); error::wallet_internal_error, "Transaction was signed by too many signers");
THROW_WALLET_EXCEPTION_IF(exported_txs.m_signers.size() == m_multisig_threshold, THROW_WALLET_EXCEPTION_IF(exported_txs.m_signers.size() == m_multisig_threshold,
error::wallet_internal_error, "Transaction is already fully signed"); error::wallet_internal_error, "Transaction is already fully signed");
THROW_WALLET_EXCEPTION_IF(frozen(exported_txs),
error::wallet_internal_error, "Will not sign multisig tx containing frozen outputs")
txids.clear(); txids.clear();

View file

@ -1592,6 +1592,7 @@ private:
void thaw(const crypto::key_image &ki); void thaw(const crypto::key_image &ki);
bool frozen(const crypto::key_image &ki) const; bool frozen(const crypto::key_image &ki) const;
bool frozen(const transfer_details &td) const; bool frozen(const transfer_details &td) const;
bool frozen(const multisig_tx_set& txs) const; // does partially signed txset contain frozen enotes?
bool save_to_file(const std::string& path_to_file, const std::string& binary, bool is_printable = false) const; bool save_to_file(const std::string& path_to_file, const std::string& binary, bool is_printable = false) const;
static bool load_from_file(const std::string& path_to_file, std::string& target_str, size_t max_size = 1000000000); static bool load_from_file(const std::string& path_to_file, std::string& target_str, size_t max_size = 1000000000);

View file

@ -77,6 +77,9 @@ class MultisigTest():
txid = self.transfer([1, 2]) txid = self.transfer([1, 2])
self.import_multisig_info([0, 1, 2, 3], 6) self.import_multisig_info([0, 1, 2, 3], 6)
self.check_transaction(txid) self.check_transaction(txid)
txid = self.try_transfer_frozen([2, 3])
self.import_multisig_info([0, 1, 2, 3], 7)
self.check_transaction(txid)
def reset(self): def reset(self):
print('Resetting blockchain') print('Resetting blockchain')
@ -316,6 +319,104 @@ class MultisigTest():
daemon.generateblocks('42ey1afDFnn4886T7196doS9GPMzexD9gXpsZJDwVjeRVdFCSoHnv7KPbBeGpzJBzHRCAs9UxqeoyFQMYbqSWYTfJJQAWDm', 1) daemon.generateblocks('42ey1afDFnn4886T7196doS9GPMzexD9gXpsZJDwVjeRVdFCSoHnv7KPbBeGpzJBzHRCAs9UxqeoyFQMYbqSWYTfJJQAWDm', 1)
return txid return txid
def try_transfer_frozen(self, signers):
assert len(signers) >= 2
daemon = Daemon()
print("Creating multisig transaction from wallet " + str(signers[0]))
dst = {'address': '42ey1afDFnn4886T7196doS9GPMzexD9gXpsZJDwVjeRVdFCSoHnv7KPbBeGpzJBzHRCAs9UxqeoyFQMYbqSWYTfJJQAWDm', 'amount': 1000000000000}
res = self.wallet[signers[0]].transfer([dst])
assert len(res.tx_hash) == 0 # not known yet
txid = res.tx_hash
assert len(res.tx_key) == 32*2
assert res.amount > 0
amount = res.amount
assert res.fee > 0
fee = res.fee
assert len(res.tx_blob) == 0
assert len(res.tx_metadata) == 0
assert len(res.multisig_txset) > 0
assert len(res.unsigned_txset) == 0
spent_key_images = res.spent_key_images.key_images
multisig_txset = res.multisig_txset
daemon.generateblocks('42ey1afDFnn4886T7196doS9GPMzexD9gXpsZJDwVjeRVdFCSoHnv7KPbBeGpzJBzHRCAs9UxqeoyFQMYbqSWYTfJJQAWDm', 1)
for i in range(len(self.wallet)):
self.wallet[i].refresh()
for i in range(len(signers[1:])):
# Check that each signer wallet has key image and it is not frozen
for ki in spent_key_images:
frozen = self.wallet[signers[i+1]].frozen(ki).frozen
assert not frozen
# Freeze key image involved with initiated transfer
assert len(spent_key_images)
ki0 = spent_key_images[0]
print("Freezing involved key image:", ki0)
self.wallet[signers[1]].freeze(ki0)
frozen = self.wallet[signers[1]].frozen(ki).frozen
assert frozen
# Try signing multisig (this operation should fail b/c of the frozen key image)
print("Attemping to sign with frozen key image. This should fail")
try:
res = self.wallet[signers[1]].sign_multisig(multisig_txset)
raise ValueError('sign_multisig should not have succeeded w/ fronzen enotes')
except AssertionError:
pass
# Thaw key image and continue transfer as normal
print("Thawing key image and continuing transfer as normal")
self.wallet[signers[1]].thaw(ki0)
frozen = self.wallet[signers[1]].frozen(ki).frozen
assert not frozen
for i in range(len(signers[1:])):
print('Signing multisig transaction with wallet ' + str(signers[i+1]))
res = self.wallet[signers[i+1]].describe_transfer(multisig_txset = multisig_txset)
assert len(res.desc) == 1
desc = res.desc[0]
assert desc.amount_in >= amount + fee
assert desc.amount_out == desc.amount_in - fee
assert desc.ring_size == 16
assert desc.unlock_time == 0
assert not 'payment_id' in desc or desc.payment_id in ['', '0000000000000000']
assert desc.change_amount == desc.amount_in - 1000000000000 - fee
assert desc.change_address == self.wallet_address
assert desc.fee == fee
assert len(desc.recipients) == 1
rec = desc.recipients[0]
assert rec.address == '42ey1afDFnn4886T7196doS9GPMzexD9gXpsZJDwVjeRVdFCSoHnv7KPbBeGpzJBzHRCAs9UxqeoyFQMYbqSWYTfJJQAWDm'
assert rec.amount == 1000000000000
res = self.wallet[signers[i+1]].sign_multisig(multisig_txset)
multisig_txset = res.tx_data_hex
assert len(res.tx_hash_list if 'tx_hash_list' in res else []) == (i == len(signers[1:]) - 1)
if i < len(signers[1:]) - 1:
print('Submitting multisig transaction prematurely with wallet ' + str(signers[-1]))
ok = False
try: self.wallet[signers[-1]].submit_multisig(multisig_txset)
except: ok = True
assert ok
print('Submitting multisig transaction with wallet ' + str(signers[-1]))
res = self.wallet[signers[-1]].submit_multisig(multisig_txset)
assert len(res.tx_hash_list) == 1
txid = res.tx_hash_list[0]
for i in range(len(self.wallet)):
self.wallet[i].refresh()
res = self.wallet[i].get_transfers()
assert len([x for x in (res['pending'] if 'pending' in res else []) if x.txid == txid]) == (1 if i == signers[-1] else 0)
assert len([x for x in (res['out'] if 'out' in res else []) if x.txid == txid]) == 0
daemon.generateblocks('42ey1afDFnn4886T7196doS9GPMzexD9gXpsZJDwVjeRVdFCSoHnv7KPbBeGpzJBzHRCAs9UxqeoyFQMYbqSWYTfJJQAWDm', 1)
return txid
def check_transaction(self, txid): def check_transaction(self, txid):
for i in range(len(self.wallet)): for i in range(len(self.wallet)):
self.wallet[i].refresh() self.wallet[i].refresh()