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Code Issues Releases Wiki Activity

core: drop obsolete check for ANYONECANSPEND segwit outputs

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This commit is contained in:
Tomas Susanka 2020-03-20 10:26:31 +00:00
parent d0d41c884e
commit f786d75a6f
2 changed files with 11 additions and 25 deletions
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4
core/src/apps/wallet/sign_tx/helpers.py
View File

@ -48,10 +48,6 @@ SEGWIT_INPUT_SCRIPT_TYPES = {
InputScriptType.SPENDP2SHWITNESS,
InputScriptType.SPENDWITNESS,
}
SEGWIT_OUTPUT_SCRIPT_TYPES = {
OutputScriptType.PAYTOP2SHWITNESS,
OutputScriptType.PAYTOWITNESS,
}
# Machine instructions
# ===

32
core/src/apps/wallet/sign_tx/signing.py
View File

@ -83,7 +83,7 @@ async def check_tx_fee(tx: SignTx, keychain: seed.Keychain, coin: coininfo.CoinI
weight = tx_weight.TxWeightCalculator(tx.inputs_count, tx.outputs_count)
total_in = 0 # sum of input amounts
segwit_in = 0 # sum of segwit input amounts
bip143_in = 0 # sum of segwit input amounts
total_out = 0 # sum of output amounts
change_out = 0 # change output amount
wallet_path = [] # common prefix of input paths
@ -123,7 +123,7 @@ async def check_tx_fee(tx: SignTx, keychain: seed.Keychain, coin: coininfo.CoinI
if not txi.amount:
raise SigningError(FailureType.DataError, "Segwit input without amount")
segwit[i] = True
segwit_in += txi.amount
bip143_in += txi.amount
total_in += txi.amount
elif txi.script_type in (
@ -136,7 +136,7 @@ async def check_tx_fee(tx: SignTx, keychain: seed.Keychain, coin: coininfo.CoinI
FailureType.DataError, "Expected input with amount"
)
segwit[i] = False
segwit_in += txi.amount
bip143_in += txi.amount
total_in += txi.amount
else:
segwit[i] = False
@ -166,9 +166,7 @@ async def check_tx_fee(tx: SignTx, keychain: seed.Keychain, coin: coininfo.CoinI
txo_bin.script_pubkey = output_derive_script(txo, coin, keychain)
weight.add_output(txo_bin.script_pubkey)
if change_out == 0 and output_is_change(
txo, wallet_path, segwit_in, multisig_fp
):
if change_out == 0 and output_is_change(txo, wallet_path, multisig_fp):
# output is change and does not need confirmation
change_out = txo.amount
elif not await helpers.confirm_output(txo, coin):
@ -219,7 +217,7 @@ async def check_tx_fee(tx: SignTx, keychain: seed.Keychain, coin: coininfo.CoinI
if not utils.BITCOIN_ONLY and coin.decred:
hash143.add_locktime_expiry(tx)
return h_first, hash143, segwit, total_in, wallet_path, multisig_fp
return h_first, hash143, segwit, bip143_in, wallet_path, multisig_fp
async def sign_tx(tx: SignTx, keychain: seed.Keychain):
@ -235,7 +233,7 @@ async def sign_tx(tx: SignTx, keychain: seed.Keychain):
h_first,
hash143,
segwit,
authorized_in,
authorized_bip143_in,
wallet_path,
multisig_fp,
) = await check_tx_fee(tx, keychain, coin)
@ -298,11 +296,11 @@ async def sign_tx(tx: SignTx, keychain: seed.Keychain):
txi_sign.script_type == InputScriptType.SPENDADDRESS
or txi_sign.script_type == InputScriptType.SPENDMULTISIG
)
if not is_bip143 or txi_sign.amount > authorized_in:
if not is_bip143 or txi_sign.amount > authorized_bip143_in:
raise SigningError(
FailureType.ProcessError, "Transaction has changed during signing"
)
authorized_in -= txi_sign.amount
authorized_bip143_in -= txi_sign.amount
key_sign = keychain.derive(txi_sign.address_n, coin.curve_name)
key_sign_pub = key_sign.public_key()
@ -523,11 +521,11 @@ async def sign_tx(tx: SignTx, keychain: seed.Keychain):
input_check_wallet_path(txi, wallet_path)
input_check_multisig_fingerprint(txi, multisig_fp)
if not input_is_segwit(txi) or txi.amount > authorized_in:
if not input_is_segwit(txi) or txi.amount > authorized_bip143_in:
raise SigningError(
FailureType.ProcessError, "Transaction has changed during signing"
)
authorized_in -= txi.amount
authorized_bip143_in -= txi.amount
key_sign = keychain.derive(txi.address_n, coin.curve_name)
key_sign_pub = key_sign.public_key()
@ -762,20 +760,12 @@ def get_address_for_change(
def output_is_change(
o: TxOutputType,
wallet_path: list,
segwit_in: int,
multisig_fp: multisig.MultisigFingerprint,
o: TxOutputType, wallet_path: list, multisig_fp: multisig.MultisigFingerprint,
) -> bool:
if o.script_type not in helpers.CHANGE_OUTPUT_SCRIPT_TYPES:
return False
if o.multisig and not multisig_fp.matches(o.multisig):
return False
if o.script_type in helpers.SEGWIT_OUTPUT_SCRIPT_TYPES and o.amount > segwit_in:
# if the output is segwit, make sure it doesn't spend more than what the
# segwit inputs paid. this is to prevent user being tricked into
# creating ANYONECANSPEND outputs before full segwit activation.
return False
return (
wallet_path is not None
and wallet_path == o.address_n[:-_BIP32_WALLET_DEPTH]