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Code Issues Releases Wiki Activity

feat(core)): forbid multisig to singlesig change outputs

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This commit is contained in:
Ondřej Vejpustek 2024-10-25 13:40:19 +02:00
parent 747d70f8fd
commit d9b7a57e8b
5 changed files with 48 additions and 29 deletions
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1
core/.changelog.d/4351.changed.1 Normal file
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@ -0,0 +1 @@
Forbidden multisig to singlesig change outputs.

15
core/src/apps/bitcoin/sign_tx/change_detector.py
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@ -17,11 +17,15 @@ _BIP32_MAX_LAST_ELEMENT = const(1_000_000)
class ChangeDetector:
def __init__(self) -> None:
from .matchcheck import (
MultisigChecker,
MultisigFingerprintChecker,
ScriptTypeChecker,
WalletPathChecker,
)
# Whether all inputs are multisig or all inputs are singlesig, used to validate change-output.
self.multisig = MultisigChecker()
# Checksum of multisig inputs, used to validate change-output.
self.multisig_fingerprint = MultisigFingerprintChecker()
@ -36,27 +40,24 @@ class ChangeDetector:
self.wallet_path.add_input(txi)
self.script_type.add_input(txi)
self.multisig_fingerprint.add_input(txi)
self.multisig.add_input(txi)
def check_input(self, txi: TxInput) -> None:
self.wallet_path.check_input(txi)
self.script_type.check_input(txi)
self.multisig_fingerprint.check_input(txi)
self.multisig.check_input(txi)
def output_is_change(self, txo: TxOutput) -> bool:
if txo.script_type not in common.CHANGE_OUTPUT_SCRIPT_TYPES:
return False
# Check the multisig fingerprint only for multisig outputs. This means
# that a transfer from a multisig account to a singlesig account is
# treated as a change-output as long as all other change-output
# conditions are satisfied. This goes a bit against the concept of a
# multisig account but the other cosigners will notice that they are
# relinquishing control of the funds, so there is no security risk.
if txo.multisig and not self.multisig_fingerprint.output_matches(txo):
return False
return (
self.wallet_path.output_matches(txo)
self.multisig.output_matches(txo)
and self.wallet_path.output_matches(txo)
and self.script_type.output_matches(txo)
and len(txo.address_n) >= common.BIP32_WALLET_DEPTH
and txo.address_n[-2] <= _BIP32_CHANGE_CHAIN

5
core/src/apps/bitcoin/sign_tx/matchcheck.py
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@ -107,6 +107,11 @@ class MultisigFingerprintChecker(MatchChecker):
return multisig.multisig_fingerprint(txio.multisig)
class MultisigChecker(MatchChecker):
def attribute_from_tx(self, txio: TxInput | TxOutput) -> Any:
return txio.multisig is not None
class ScriptTypeChecker(MatchChecker):
def attribute_from_tx(self, txio: TxInput | TxOutput) -> Any:
from trezor.enums import InputScriptType

40
core/tests/test_apps.bitcoin.change_detector.py
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@ -120,17 +120,17 @@ class TestChangeDetector(unittest.TestCase):
# External output
assert self.d.output_is_change(get_external_singlesig_output()) == False
def test_multisig_different_xpubs_order(self):
# Different order of xpubs
self.d.add_input(get_multisig_input([H_(45), 0, 0, 0], [xpub1, xpub2]))
self.d.add_input(get_multisig_input([H_(45), 0, 0, 0], [xpub2, xpub1]))
def test_singlesig_different_account_indices(self):
# Different account indices
self.d.add_input(get_singlesig_input([H_(45), 0, 0, 0]))
self.d.add_input(get_singlesig_input([H_(45), 1, 0, 0]))
# Same ouputs as inputs
assert self.d.output_is_change(get_internal_multisig_output([H_(45), 0, 0, 0], [xpub1, xpub2])) == True
assert self.d.output_is_change(get_internal_multisig_output([H_(45), 0, 0, 0], [xpub2, xpub1])) == True
# Same outputs as inputs
assert self.d.output_is_change(get_internal_singlesig_output([H_(45), 0, 0, 0])) == False
assert self.d.output_is_change(get_internal_singlesig_output([H_(45), 1, 0, 0])) == False
# Singlesig instead of multisig
assert self.d.output_is_change(get_internal_singlesig_output([H_(45), 0, 0, 0])) == True
# Multisig instead of singlesig
assert self.d.output_is_change(get_internal_multisig_output([H_(45), 0, 0, 0], [xpub1])) == False
# External output
assert self.d.output_is_change(get_external_singlesig_output()) == False
@ -149,7 +149,7 @@ class TestChangeDetector(unittest.TestCase):
assert self.d.output_is_change(get_internal_multisig_output([H_(45), 0, 1, 1], [xpub1, xpub2])) == True
# Singlesig instead of multisig
assert self.d.output_is_change(get_internal_singlesig_output([H_(45), 0, 0, 0])) == True
assert self.d.output_is_change(get_internal_singlesig_output([H_(45), 0, 0, 0])) == False
# Different account index
assert self.d.output_is_change(get_internal_singlesig_output([H_(45), 1, 0, 0])) == False
@ -163,17 +163,17 @@ class TestChangeDetector(unittest.TestCase):
# External output
assert self.d.output_is_change(get_external_singlesig_output()) == False
def test_singlesig_different_account_indices(self):
# Different account indices
self.d.add_input(get_singlesig_input([H_(45), 0, 0, 0]))
self.d.add_input(get_singlesig_input([H_(45), 1, 0, 0]))
def test_multisig_different_xpubs_order(self):
# Different order of xpubs
self.d.add_input(get_multisig_input([H_(45), 0, 0, 0], [xpub1, xpub2]))
self.d.add_input(get_multisig_input([H_(45), 0, 0, 0], [xpub2, xpub1]))
# Same outputs as inputs
# Same ouputs as inputs
assert self.d.output_is_change(get_internal_multisig_output([H_(45), 0, 0, 0], [xpub1, xpub2])) == True
assert self.d.output_is_change(get_internal_multisig_output([H_(45), 0, 0, 0], [xpub2, xpub1])) == True
# Singlesig instead of multisig
assert self.d.output_is_change(get_internal_singlesig_output([H_(45), 0, 0, 0])) == False
assert self.d.output_is_change(get_internal_singlesig_output([H_(45), 1, 0, 0])) == False
# Multisig instead of singlesig
assert self.d.output_is_change(get_internal_multisig_output([H_(45), 0, 0, 0], [xpub1])) == False
# External output
assert self.d.output_is_change(get_external_singlesig_output()) == False
@ -188,7 +188,7 @@ class TestChangeDetector(unittest.TestCase):
assert self.d.output_is_change(get_internal_multisig_output([H_(45), 0, 0, 0], [xpub1, xpub3])) == False
# Singlesig instead of multisig
assert self.d.output_is_change(get_internal_singlesig_output([H_(45), 0, 0, 0])) == True
assert self.d.output_is_change(get_internal_singlesig_output([H_(45), 0, 0, 0])) == False
# External output
assert self.d.output_is_change(get_external_singlesig_output()) == False

16
tests/device_tests/bitcoin/test_multisig_change.py
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@ -222,7 +222,13 @@ def test_external_internal(client: Client):
with client:
client.set_expected_responses(
_responses(client, INP1, INP2, change_indices=[2], foreign_indices=[2])
_responses(
client,
INP1,
INP2,
change_indices=[] if is_core(client) else [2],
foreign_indices=[2],
)
)
if is_core(client):
IF = InputFlowConfirmAllWarnings(client)
@ -252,7 +258,13 @@ def test_internal_external(client: Client):
with client:
client.set_expected_responses(
_responses(client, INP1, INP2, change_indices=[1], foreign_indices=[1])
_responses(
client,
INP1,
INP2,
change_indices=[] if is_core(client) else [1],
foreign_indices=[1],
)
)
if is_core(client):
IF = InputFlowConfirmAllWarnings(client)