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207 lines
6.0 KiB
207 lines
6.0 KiB
from typing import TYPE_CHECKING
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from trezor import wire
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from trezor.crypto import rlp
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from trezor.crypto.curve import secp256k1
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from trezor.crypto.hashlib import sha3_256
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from trezor.messages import EthereumSignTx, EthereumTxAck, EthereumTxRequest
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from trezor.utils import HashWriter
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from apps.common import paths
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from . import tokens
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from .helpers import bytes_from_address
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from .keychain import with_keychain_from_chain_id
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from .layout import (
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require_confirm_data,
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require_confirm_fee,
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require_confirm_tx,
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require_confirm_unknown_token,
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)
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if TYPE_CHECKING:
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from apps.common.keychain import Keychain
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from .keychain import EthereumSignTxAny
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# Maximum chain_id which returns the full signature_v (which must fit into an uint32).
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# chain_ids larger than this will only return one bit and the caller must recalculate
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# the full value: v = 2 * chain_id + 35 + v_bit
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MAX_CHAIN_ID = (0xFFFF_FFFF - 36) // 2
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@with_keychain_from_chain_id
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async def sign_tx(
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ctx: wire.Context, msg: EthereumSignTx, keychain: Keychain
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) -> EthereumTxRequest:
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check(msg)
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await paths.validate_path(ctx, keychain, msg.address_n)
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# Handle ERC20s
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token, address_bytes, recipient, value = await handle_erc20(ctx, msg)
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data_total = msg.data_length
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await require_confirm_tx(ctx, recipient, value, msg.chain_id, token)
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if token is None and msg.data_length > 0:
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await require_confirm_data(ctx, msg.data_initial_chunk, data_total)
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await require_confirm_fee(
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ctx,
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value,
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int.from_bytes(msg.gas_price, "big"),
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int.from_bytes(msg.gas_limit, "big"),
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msg.chain_id,
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token,
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)
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data = bytearray()
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data += msg.data_initial_chunk
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data_left = data_total - len(msg.data_initial_chunk)
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total_length = get_total_length(msg, data_total)
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sha = HashWriter(sha3_256(keccak=True))
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rlp.write_header(sha, total_length, rlp.LIST_HEADER_BYTE)
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if msg.tx_type is not None:
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rlp.write(sha, msg.tx_type)
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for field in (msg.nonce, msg.gas_price, msg.gas_limit, address_bytes, msg.value):
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rlp.write(sha, field)
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if data_left == 0:
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rlp.write(sha, data)
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else:
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rlp.write_header(sha, data_total, rlp.STRING_HEADER_BYTE, data)
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sha.extend(data)
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while data_left > 0:
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resp = await send_request_chunk(ctx, data_left)
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data_left -= len(resp.data_chunk)
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sha.extend(resp.data_chunk)
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# eip 155 replay protection
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rlp.write(sha, msg.chain_id)
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rlp.write(sha, 0)
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rlp.write(sha, 0)
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digest = sha.get_digest()
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result = sign_digest(msg, keychain, digest)
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return result
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async def handle_erc20(
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ctx: wire.Context, msg: EthereumSignTxAny
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) -> tuple[tokens.TokenInfo | None, bytes, bytes, int]:
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token = None
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address_bytes = recipient = bytes_from_address(msg.to)
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value = int.from_bytes(msg.value, "big")
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if (
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len(msg.to) in (40, 42)
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and len(msg.value) == 0
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and msg.data_length == 68
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and len(msg.data_initial_chunk) == 68
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and msg.data_initial_chunk[:16]
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== b"\xa9\x05\x9c\xbb\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
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):
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token = tokens.token_by_chain_address(msg.chain_id, address_bytes)
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recipient = msg.data_initial_chunk[16:36]
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value = int.from_bytes(msg.data_initial_chunk[36:68], "big")
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if token is tokens.UNKNOWN_TOKEN:
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await require_confirm_unknown_token(ctx, address_bytes)
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return token, address_bytes, recipient, value
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def get_total_length(msg: EthereumSignTx, data_total: int) -> int:
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length = 0
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if msg.tx_type is not None:
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length += rlp.length(msg.tx_type)
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fields: tuple[rlp.RLPItem, ...] = (
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msg.nonce,
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msg.gas_price,
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msg.gas_limit,
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bytes_from_address(msg.to),
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msg.value,
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msg.chain_id,
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0,
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0,
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)
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for field in fields:
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length += rlp.length(field)
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length += rlp.header_length(data_total, msg.data_initial_chunk)
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length += data_total
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return length
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async def send_request_chunk(ctx: wire.Context, data_left: int) -> EthereumTxAck:
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# TODO: layoutProgress ?
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req = EthereumTxRequest()
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if data_left <= 1024:
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req.data_length = data_left
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else:
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req.data_length = 1024
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return await ctx.call(req, EthereumTxAck)
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def sign_digest(
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msg: EthereumSignTx, keychain: Keychain, digest: bytes
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) -> EthereumTxRequest:
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node = keychain.derive(msg.address_n)
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signature = secp256k1.sign(
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node.private_key(), digest, False, secp256k1.CANONICAL_SIG_ETHEREUM
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)
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req = EthereumTxRequest()
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req.signature_v = signature[0]
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if msg.chain_id > MAX_CHAIN_ID:
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req.signature_v -= 27
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else:
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req.signature_v += 2 * msg.chain_id + 8
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req.signature_r = signature[1:33]
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req.signature_s = signature[33:]
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return req
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def check(msg: EthereumSignTx) -> None:
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if msg.tx_type not in [1, 6, None]:
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raise wire.DataError("tx_type out of bounds")
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if len(msg.gas_price) + len(msg.gas_limit) > 30:
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raise wire.DataError("Fee overflow")
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check_common_fields(msg)
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def check_common_fields(msg: EthereumSignTxAny) -> None:
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if msg.data_length > 0:
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if not msg.data_initial_chunk:
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raise wire.DataError("Data length provided, but no initial chunk")
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# Our encoding only supports transactions up to 2^24 bytes. To
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# prevent exceeding the limit we use a stricter limit on data length.
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if msg.data_length > 16_000_000:
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raise wire.DataError("Data length exceeds limit")
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if len(msg.data_initial_chunk) > msg.data_length:
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raise wire.DataError("Invalid size of initial chunk")
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if len(msg.to) not in (0, 40, 42):
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raise wire.DataError("Invalid recipient address")
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if not msg.to and msg.data_length == 0:
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# sending transaction to address 0 (contract creation) without a data field
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raise wire.DataError("Contract creation without data")
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if msg.chain_id == 0:
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raise wire.DataError("Chain ID out of bounds")
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