1335 lines
45 KiB
Python
1335 lines
45 KiB
Python
# (c) Copyright 2018 by Coinkite Inc. This file is part of Coldcard <coldcardwallet.com>
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# and is covered by GPLv3 license found in COPYING.
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#
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# multisig.py - support code for multisig signing and p2sh in general.
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#
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import stash, chains, ustruct, ure, uio, sys
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#from ubinascii import hexlify as b2a_hex
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from utils import xfp2str, str2xfp, swab32, cleanup_deriv_path, keypath_to_str, str_to_keypath
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from ux import ux_show_story, ux_confirm, ux_dramatic_pause, ux_clear_keys
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from files import CardSlot, CardMissingError
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from public_constants import AF_P2SH, AF_P2WSH_P2SH, AF_P2WSH, AFC_SCRIPT, MAX_PATH_DEPTH
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from menu import MenuSystem, MenuItem
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from opcodes import OP_CHECKMULTISIG
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from actions import needs_microsd
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from exceptions import FatalPSBTIssue
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# Bitcoin limitation: max number of signatures in CHECK_MULTISIG
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# - 520 byte redeem script limit <= 15*34 bytes per pubkey == 510 bytes
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MAX_SIGNERS = const(15)
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# PSBT Xpub trust policies
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TRUST_VERIFY = const(0)
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TRUST_OFFER = const(1)
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TRUST_PSBT = const(2)
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# when we aren't sure of the derivation of an xpub we are holding
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# - should only happen from older version data
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UNSURE_DERIV = '*'
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class MultisigOutOfSpace(RuntimeError):
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pass
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def disassemble_multisig_mn(redeem_script):
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# pull out just M and N from script. Simple, faster, no memory.
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assert MAX_SIGNERS == 15
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assert redeem_script[-1] == OP_CHECKMULTISIG, 'need CHECKMULTISIG'
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M = redeem_script[0] - 80
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N = redeem_script[-2] - 80
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return M, N
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def disassemble_multisig(redeem_script):
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# Take apart a standard multisig's redeem/witness script, and return M/N and public keys
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# - only for multisig scripts, not general purpose
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# - expect OP_1 (pk1) (pk2) (pk3) OP_3 OP_CHECKMULTISIG for 1 of 3 case
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# - returns M, N, (list of pubkeys)
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# - for very unlikely/impossible asserts, dont document reason; otherwise do.
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from serializations import disassemble
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M, N = disassemble_multisig_mn(redeem_script)
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assert 1 <= M <= N <= MAX_SIGNERS, 'M/N range'
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assert len(redeem_script) == 1 + (N * 34) + 1 + 1, 'bad len'
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# generator function
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dis = disassemble(redeem_script)
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# expect M value first
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ex_M, opcode = next(dis)
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assert ex_M == M and opcode == None, 'bad M'
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# need N pubkeys
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pubkeys = []
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for idx in range(N):
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data, opcode = next(dis)
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assert opcode == None and len(data) == 33, 'data'
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assert data[0] == 0x02 or data[0] == 0x03, 'Y val'
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pubkeys.append(data)
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assert len(pubkeys) == N
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# next is N value
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ex_N, opcode = next(dis)
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assert ex_N == N and opcode == None
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# finally, the opcode: CHECKMULTISIG
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data, opcode = next(dis)
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assert opcode == OP_CHECKMULTISIG
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# must have reached end of script at this point
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try:
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next(dis)
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raise AssertionError("too long")
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except StopIteration:
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# expected, since we're reading past end
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pass
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return M, N, pubkeys
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class MultisigWallet:
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# Capture the info we need to store long-term in order to participate in a
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# multisig wallet as a co-signer.
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# - can be saved to nvram
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# - can be imported from a simple text file
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# - can be displayed to user in a menu (and deleted)
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# - required during signing to verify change outputs
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# - can reconstruct any redeem script from this
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# Challenges:
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# - can be big, taking big % of 4k storage in nvram
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# - complex object, want to have flexibility going forward
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FORMAT_NAMES = [
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(AF_P2SH, 'p2sh'),
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(AF_P2WSH, 'p2wsh'),
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(AF_P2WSH_P2SH, 'p2wsh-p2sh'),
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]
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def __init__(self, name, m_of_n, xpubs, addr_fmt=AF_P2SH, chain_type='BTC'):
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self.storage_idx = -1
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self.name = name
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assert len(m_of_n) == 2
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self.M, self.N = m_of_n
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self.chain_type = chain_type or 'BTC'
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assert len(xpubs[0]) == 3
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self.xpubs = xpubs # list of (xfp(int), deriv, xpub(str))
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self.addr_fmt = addr_fmt # not clear how useful that is.
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# calc useful cache value: numeric xfp+subpath, with lookup
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self.xfp_paths = {}
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for xfp, deriv, _ in self.xpubs:
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self.xfp_paths[xfp] = str_to_keypath(xfp, deriv)
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assert len(self.xfp_paths) == self.N, 'dup XFP' # not supported
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@classmethod
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def render_addr_fmt(cls, addr_fmt):
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for k, v in cls.FORMAT_NAMES:
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if k == addr_fmt:
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return v.upper()
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return '?'
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@property
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def chain(self):
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return chains.get_chain(self.chain_type)
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@classmethod
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def get_trust_policy(cls):
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from main import settings
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which = settings.get('pms', None)
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if which is None:
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which = TRUST_VERIFY if cls.exists() else TRUST_OFFER
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return which
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def serialize(self):
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# return a JSON-able object
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opts = dict()
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if self.addr_fmt != AF_P2SH:
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opts['ft'] = self.addr_fmt
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if self.chain_type != 'BTC':
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opts['ch'] = self.chain_type
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# Data compression: most legs will all use same derivation.
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# put a int(0) in place and set option 'pp' to be deriation
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# (used to be common_prefix assumption)
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pp = list(sorted(set(d for _,d,_ in self.xpubs)))
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opts['d'] = pp
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xp = [(a, pp.index(deriv),c) for a,deriv,c in self.xpubs]
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return (self.name, (self.M, self.N), xp, opts)
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@classmethod
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def deserialize(cls, vals, idx=-1):
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# take json object, make instance.
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name, m_of_n, xpubs, opts = vals
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if len(xpubs[0]) == 2:
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# promote from old format to new: assume common prefix is the derivation
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# for all of them
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# PROBLEM: we don't have enough info if no common prefix can be assumed
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common_prefix = opts.get('pp', None) or UNSURE_DERIV
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xpubs = [(a, common_prefix, b) for a,b in xpubs]
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else:
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# new format decompression
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if 'd' in opts:
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derivs = opts.get('d', None)
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xpubs = [(a, derivs[b], c) for a,b,c in xpubs]
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rv = cls(name, m_of_n, xpubs, addr_fmt=opts.get('ft', AF_P2SH),
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chain_type=opts.get('ch', 'BTC'))
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rv.storage_idx = idx
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return rv
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@classmethod
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def find_match(cls, M, N, xfp_paths):
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# Find index of matching wallet. Don't de-serialize more than needed.
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# - xfp_paths is list of lists: [xfp, *path] like in psbt files
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# - M and N must be known
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# - returns instance, or None if not found
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from main import settings
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lst = settings.get('multisig', [])
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fingerprints = set(f[0] for f in xfp_paths)
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for idx, rec in enumerate(lst):
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name, m_of_n, xpubs, opts = rec
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if tuple(m_of_n) != (M, N):
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continue
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if set(f[0] for f in xpubs) != fingerprints: continue
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rv = cls.deserialize(rec, idx)
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if rv.matching_subpaths(xfp_paths):
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return rv
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del rv
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return None
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@classmethod
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def find_candidates(cls, xfp_paths, addr_fmt=None):
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# Return a list of matching wallets for various M values.
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# - xpfs_paths hsould already be sorted
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# - returns set of matches, of any M value
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from main import settings
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lst = settings.get('multisig', [])
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# we know N, but not M at this point.
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N = len(xfp_paths)
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rv = []
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for idx, rec in enumerate(lst):
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name, m_of_n, xpubs, opts = rec
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if m_of_n[1] != N: continue
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if addr_fmt is not None:
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af = opts.get('ft', AF_P2SH)
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if af != addr_fmt: continue
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maybe = cls.deserialize(rec, idx)
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if maybe.matching_subpaths(xfp_paths):
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rv.append(maybe)
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else:
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del maybe
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return rv
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def matching_subpaths(self, xfp_paths):
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# Does this wallet use same set of xfp values, and
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# the same prefix path per-each xfp, as indicated
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# xfp_paths (unordered)?
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# - could also check non-prefix part is all non-hardened
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for x in xfp_paths:
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if x[0] not in self.xfp_paths:
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return False
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prefix = self.xfp_paths[x[0]]
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if len(x) < len(prefix):
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# PSBT specs a path shorter than wallet's xpub
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#print('path len: %d vs %d' % (len(prefix), len(x)))
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return False
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comm = len(prefix)
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if tuple(prefix[:comm]) != tuple(x[:comm]):
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# xfp => maps to wrong path
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#print('path mismatch:\n%r\n%r\ncomm=%d' % (prefix[:comm], x[:comm], comm))
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return False
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return True
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def assert_matching(self, M, N, xfp_paths):
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# compare in-memory wallet with details recovered from PSBT
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# - xfp_paths must be sorted already
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assert (self.M, self.N) == (M, N), "M/N mismatch"
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assert len(xfp_paths) == N, "XFP count"
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assert self.matching_subpaths(xfp_paths), "wrong XFP/derivs"
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@classmethod
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def quick_check(cls, M, N, xfp_xor):
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# quicker USB method.
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from main import settings
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lst = settings.get('multisig', [])
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rv = []
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for rec in lst:
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name, m_of_n, xpubs, opts = rec
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if m_of_n[0] != M: continue
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if m_of_n[1] != N: continue
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x = 0
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for xfp, _, _ in xpubs:
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x ^= xfp
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if x != xfp_xor: continue
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return True
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return False
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@classmethod
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def get_all(cls):
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# return them all, as a generator
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from main import settings
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lst = settings.get('multisig', [])
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for idx, v in enumerate(lst):
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yield cls.deserialize(v, idx)
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@classmethod
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def exists(cls):
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# are there any wallets defined?
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from main import settings
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return bool(settings.get('multisig', False))
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@classmethod
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def get_by_idx(cls, nth):
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# instance from index number
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from main import settings
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lst = settings.get('multisig', [])
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try:
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obj = lst[nth]
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except IndexError:
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return None
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return cls.deserialize(obj, nth)
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def commit(self):
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# data to save
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# - important that this fails immediately when nvram overflows
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from main import settings
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obj = self.serialize()
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v = settings.get('multisig', [])
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orig = v.copy()
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if not v or self.storage_idx == -1:
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# create
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self.storage_idx = len(v)
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v.append(obj)
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else:
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# update: no provision for changing fingerprints
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assert sorted(k for k,v in v[self.storage_idx][2]) == self.xfps
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v[self.storage_idx] = obj
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settings.set('multisig', v)
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# save now, rather than in background, so we can recover
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# from out-of-space situation
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try:
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settings.save()
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except:
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# back out change; no longer sure of NVRAM state
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try:
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settings.set('multisig', orig)
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settings.save()
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except: pass # give up on recovery
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raise MultisigOutOfSpace
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def has_similar(self):
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# check if we already have a saved duplicate to this proposed wallet
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# - return (name_change, diff_items) where:
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# - name_change is existing wallet that has exact match, different name
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# - diff_items: text list of similarity/differences
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similar = MultisigWallet.find_candidates(list(self.xfp_paths.values()))
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if not similar:
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# no matches
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return None, []
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# See if the xpubs are changing, which is risky... other differences like
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# name are okay.
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diffs = set()
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name_diff = None
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for c in similar:
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if c.M != self.M:
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diffs.add('M differs')
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if c.addr_fmt != self.addr_fmt:
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diffs.add('address type')
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if c.name != self.name and c.matching_subpaths(c):
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diffs.add('name')
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name_diff = c
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if name_diff and len(diffs) == 1:
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return name_diff, []
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return None, diffs
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def delete(self):
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# remove saved entry
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# - important: not expecting more than one instance of this class in memory
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from main import settings
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assert self.storage_idx >= 0
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# safety check
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existing = self.find_match(self.M, self.N, list(self.xfp_paths.values()))
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assert existing
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assert existing.storage_idx == self.storage_idx
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lst = settings.get('multisig', [])
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del lst[self.storage_idx]
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settings.set('multisig', lst)
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settings.save()
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self.storage_idx = -1
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def xpubs_with_xfp(self, xfp):
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# return set of indexes of xpubs with indicated xfp
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return set(xp_idx for xp_idx, (wxfp, _, _) in enumerate(self.xpubs)
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if wxfp == xfp)
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def validate_script(self, redeem_script, subpaths=None, xfp_paths=None):
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# Check we can generate all pubkeys in the redeem script, raise on errors.
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# - working from pubkeys in the script, because duplicate XFP can happen
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#
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# redeem_script: what we expect and we were given
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# subpaths: pubkey => (xfp, *path)
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# xfp_paths: (xfp, *path) in same order as pubkeys in redeem script
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subpath_help = []
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used = set()
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ch = self.chain
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M, N, pubkeys = disassemble_multisig(redeem_script)
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assert M==self.M and N == self.N, 'wrong M/N in script'
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for pk_order, pubkey in enumerate(pubkeys):
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check_these = []
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if subpaths:
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# in PSBT, we are given a map from pubkey to xfp/path, use it
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# while remembering it's potentially one-2-many
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# TODO: this could be simpler now
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assert pubkey in subpaths, "unexpected pubkey"
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xfp, *path = subpaths[pubkey]
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for xp_idx, (wxfp, _, xpub) in enumerate(self.xpubs):
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if wxfp != xfp: continue
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if xp_idx in used: continue # only allow once
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check_these.append((xp_idx, path))
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else:
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# Without PSBT, USB caller must provide xfp+path
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# in same order as they occur inside redeem script.
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# Working solely from the redeem script's pubkeys, we
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# wouldn't know which xpub to use, nor correct path for it.
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xfp, *path = xfp_paths[pk_order]
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for xp_idx in self.xpubs_with_xfp(xfp):
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if xp_idx in used: continue # only allow once
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check_these.append((xp_idx, path))
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here = None
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too_shallow = False
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for xp_idx, path in check_these:
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# matched fingerprint, try to make pubkey that needs to match
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xpub = self.xpubs[xp_idx][-1]
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node = ch.deserialize_node(xpub, AF_P2SH); assert node
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dp = node.depth()
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if not (0 <= dp <= len(path)):
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# obscure case: xpub isn't deep enough to represent
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# indicated path... not wrong really.
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too_shallow = True
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continue
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for sp in path[dp:]:
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assert not (sp & 0x80000000), 'hard deriv'
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node.derive(sp) # works in-place
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found_pk = node.public_key()
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# Document path(s) used. Not sure this is useful info to user tho.
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# - Do not show what we can't verify: we don't really know the hardeneded
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# part of the path from fingerprint to here.
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here = '(m=%s)\n' % xfp2str(xfp)
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if dp != len(path):
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here += 'm' + ('/_'*dp) + keypath_to_str(path[dp:], '/', 0)
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if found_pk != pubkey:
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# Not a match but not an error by itself, since might be
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# another dup xfp to look at still.
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#print('pk mismatch: %s => %s != %s' % (
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# here, b2a_hex(found_pk), b2a_hex(pubkey)))
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continue
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subpath_help.append(here)
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used.add(xp_idx)
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break
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else:
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msg = 'pk#%d wrong' % (pk_order+1)
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if not check_these:
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msg += ', unknown XFP'
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elif here:
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msg += ', tried: ' + here
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if too_shallow:
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msg += ', too shallow'
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raise AssertionError(msg)
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if pk_order:
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# verify sorted order
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assert bytes(pubkey) > bytes(pubkeys[pk_order-1]), 'BIP67 violation'
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assert len(used) == self.N, 'not all keys used: %d of %d' % (len(used), self.N)
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return subpath_help
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@classmethod
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def from_file(cls, config, name=None):
|
|
# Given a simple text file, parse contents and create instance (unsaved).
|
|
# format is: label: value
|
|
# where label is:
|
|
# name: nameforwallet
|
|
# policy: M of N
|
|
# format: p2sh (+etc)
|
|
# derivation: m/45'/0 (common prefix)
|
|
# (8digithex): xpub of cosigner
|
|
#
|
|
# quick checks:
|
|
# - name: 1-20 ascii chars
|
|
# - M of N line (assume N of N if not spec'd)
|
|
# - xpub: any bip32 serialization we understand, but be consistent
|
|
#
|
|
from main import settings
|
|
|
|
my_xfp = settings.get('xfp')
|
|
deriv = None
|
|
xpubs = []
|
|
M, N = -1, -1
|
|
has_mine = 0
|
|
addr_fmt = AF_P2SH
|
|
expect_chain = chains.current_chain().ctype
|
|
|
|
lines = config.split('\n')
|
|
|
|
for ln in lines:
|
|
# remove comments
|
|
comm = ln.find('#')
|
|
if comm != -1:
|
|
ln = ln[0:comm]
|
|
|
|
ln = ln.strip()
|
|
|
|
if ':' not in ln:
|
|
if 'pub' in ln:
|
|
# optimization: allow bare xpub if we can calc xfp
|
|
label = '0'*8
|
|
value = ln
|
|
else:
|
|
# complain?
|
|
#if ln: print("no colon: " + ln)
|
|
continue
|
|
else:
|
|
label, value = ln.split(':')
|
|
label = label.lower()
|
|
|
|
value = value.strip()
|
|
|
|
if label == 'name':
|
|
name = value
|
|
elif label == 'policy':
|
|
try:
|
|
# accepts: 2 of 3 2/3 2,3 2 3 etc
|
|
mat = ure.search(r'(\d+)\D*(\d+)', value)
|
|
assert mat
|
|
M = int(mat.group(1))
|
|
N = int(mat.group(2))
|
|
assert 1 <= M <= N <= MAX_SIGNERS
|
|
except:
|
|
raise AssertionError('bad policy line')
|
|
|
|
elif label == 'derivation':
|
|
# reveal the path derivation for following key(s)
|
|
try:
|
|
deriv = cleanup_deriv_path(value)
|
|
except BaseException as exc:
|
|
raise AssertionError('bad derivation line: ' + str(exc))
|
|
|
|
elif label == 'format':
|
|
# pick segwit vs. classic vs. wrapped version
|
|
value = value.lower()
|
|
for fmt_code, fmt_label in cls.FORMAT_NAMES:
|
|
if value == fmt_label:
|
|
addr_fmt = fmt_code
|
|
break
|
|
else:
|
|
raise AssertionError('bad format line')
|
|
elif len(label) == 8:
|
|
try:
|
|
xfp = str2xfp(label)
|
|
except:
|
|
# complain?
|
|
#print("Bad xfp: " + ln)
|
|
continue
|
|
|
|
# deserialize, update list and lots of checks
|
|
is_mine = cls.check_xpub(xfp, value, deriv, expect_chain, my_xfp, xpubs)
|
|
if is_mine:
|
|
has_mine += 1
|
|
|
|
assert len(xpubs), 'need xpubs'
|
|
|
|
if M == N == -1:
|
|
# default policy: all keys
|
|
N = M = len(xpubs)
|
|
|
|
if not name:
|
|
# provide a default name
|
|
name = '%d-of-%d' % (M, N)
|
|
|
|
try:
|
|
name = str(name, 'ascii')
|
|
assert 1 <= len(name) <= 20
|
|
except:
|
|
raise AssertionError('name must be ascii, 1..20 long')
|
|
|
|
assert 1 <= M <= N <= MAX_SIGNERS, 'M/N range'
|
|
assert N == len(xpubs), 'wrong # of xpubs, expect %d' % N
|
|
assert addr_fmt & AFC_SCRIPT, 'script style addr fmt'
|
|
|
|
# check we're included... do not insert ourselves, even tho we
|
|
# have enough info, simply because other signers need to know my xpubkey anyway
|
|
assert has_mine != 0, 'my key not included'
|
|
assert has_mine == 1 # 'my key included more than once'
|
|
|
|
# done. have all the parts
|
|
return cls(name, (M, N), xpubs, addr_fmt=addr_fmt, chain_type=expect_chain)
|
|
|
|
@classmethod
|
|
def check_xpub(cls, xfp, xpub, deriv, expect_chain, my_xfp, xpubs):
|
|
# Shared code: consider an xpub for inclusion into a wallet, if ok, append
|
|
# to list: xpubs with a tuple: (xfp, deriv, xpub)
|
|
# return T if it's our own key
|
|
# - deriv can be None, and in very limited cases can recover derivation path
|
|
|
|
try:
|
|
# Note: addr fmt detected here via SLIP-132 isn't useful
|
|
node, chain, _ = import_xpub(xpub)
|
|
except:
|
|
raise AssertionError('unable to parse xpub')
|
|
|
|
assert node.private_key() == None # 'no privkeys plz'
|
|
assert chain.ctype == expect_chain # 'wrong chain'
|
|
|
|
# NOTE: could enforce all same depth, and/or all depth >= 1, but
|
|
# seems like more restrictive than needed.
|
|
if node.depth() == 1:
|
|
if not xfp:
|
|
# allow a shortcut: zero/omit xfp => use observed parent value
|
|
xfp = swab32(node.fingerprint())
|
|
else:
|
|
# generally cannot check fingerprint values, but if we can, do.
|
|
assert swab32(node.fingerprint()) == xfp, 'xfp depth=1 wrong'
|
|
|
|
assert xfp # 'need fingerprint'
|
|
|
|
# In most cases, we cannot verify the derivation path because it's hardened
|
|
# and we know none of the private keys involved.
|
|
if node.depth() == 1:
|
|
# but derivation is implied at depth==1
|
|
cn = node.child_num()
|
|
guess = 'm/%d' % (cn & 0x7fffffff)
|
|
if cn & 0x80000000:
|
|
guess += "'"
|
|
|
|
if deriv:
|
|
assert guess == deriv, '%s != %s' % (guess, deriv)
|
|
else:
|
|
deriv = guess # reachable? doubt it
|
|
|
|
assert deriv, 'need deriv path'
|
|
|
|
if xfp == my_xfp:
|
|
# its supposed to be my key, so I should be able to generate pubkey
|
|
# - might indicate collision on xfp value between co-signers, and that's not supported
|
|
with stash.SensitiveValues() as sv:
|
|
chk_node = sv.derive_path(deriv)
|
|
assert node.public_key() == chk_node.public_key(), "XFP non-unique"
|
|
|
|
# serialize xpub w/ BIP32 standard now.
|
|
# - this has effect of stripping SLIP-132 confusion away
|
|
xpubs.append((xfp, deriv, chain.serialize_public(node, AF_P2SH)))
|
|
|
|
return (xfp == my_xfp)
|
|
|
|
def make_fname(self, prefix, suffix='txt'):
|
|
rv = '%s-%s.%s' % (prefix, self.name, suffix)
|
|
return rv.replace(' ', '_')
|
|
|
|
async def export_electrum(self):
|
|
# Generate and save an Electrum JSON file.
|
|
from export import make_json_wallet
|
|
|
|
def doit():
|
|
rv = dict(seed_version=17, use_encryption=False,
|
|
wallet_type='%dof%d' % (self.M, self.N))
|
|
|
|
ch = self.chain
|
|
|
|
# the important stuff.
|
|
for idx, (xfp, deriv, xpub) in enumerate(self.xpubs):
|
|
|
|
if self.addr_fmt != AF_P2SH:
|
|
# CHALLENGE: we must do slip-132 format [yz]pubs here when not p2sh mode.
|
|
node = ch.deserialize_node(xpub, AF_P2SH); assert node
|
|
xp = ch.serialize_public(node, self.addr_fmt)
|
|
else:
|
|
xp = xpub
|
|
|
|
assert deriv != UNSURE_DERIV # also checked above
|
|
|
|
rv['x%d/' % (idx+1)] = dict(
|
|
hw_type='coldcard', type='hardware',
|
|
ckcc_xfp=xfp,
|
|
label='Coldcard %s' % xfp2str(xfp),
|
|
derivation=deriv, xpub=xp)
|
|
|
|
return rv
|
|
|
|
await make_json_wallet('Electrum multisig wallet', doit,
|
|
fname_pattern=self.make_fname('el', 'json'))
|
|
|
|
async def export_wallet_file(self, mode="exported from", extra_msg=None):
|
|
# create a text file with the details; ready for import to next Coldcard
|
|
from main import settings
|
|
my_xfp = xfp2str(settings.get('xfp'))
|
|
|
|
fname_pattern = self.make_fname('export')
|
|
|
|
try:
|
|
with CardSlot() as card:
|
|
fname, nice = card.pick_filename(fname_pattern)
|
|
|
|
# do actual write
|
|
with open(fname, 'wt') as fp:
|
|
print("# Coldcard Multisig setup file (%s %s)\n#" % (mode, my_xfp), file=fp)
|
|
self.render_export(fp)
|
|
|
|
msg = '''Coldcard multisig setup file written:\n\n%s''' % nice
|
|
if extra_msg:
|
|
msg += extra_msg
|
|
|
|
await ux_show_story(msg)
|
|
|
|
except CardMissingError:
|
|
await needs_microsd()
|
|
return
|
|
except Exception as e:
|
|
await ux_show_story('Failed to write!\n\n\n'+str(e))
|
|
return
|
|
|
|
def render_export(self, fp):
|
|
print("Name: %s\nPolicy: %d of %d" % (self.name, self.M, self.N), file=fp)
|
|
|
|
if self.addr_fmt != AF_P2SH:
|
|
print("Format: " + self.render_addr_fmt(self.addr_fmt), file=fp)
|
|
|
|
last_deriv = None
|
|
for xfp, deriv, val in self.xpubs:
|
|
if last_deriv != deriv:
|
|
print("\nDerivation: %s\n" % deriv, file=fp)
|
|
last_deriv = deriv
|
|
|
|
print('%s: %s' % (xfp2str(xfp), val), file=fp)
|
|
|
|
@classmethod
|
|
def import_from_psbt(cls, M, N, xpubs_list):
|
|
# given the raw data fro PSBT global header, offer the user
|
|
# the details, and/or bypass that all and just trust the data.
|
|
# - xpubs_list is a list of (xfp+path, binary BIP32 xpub)
|
|
# - already know not in our records.
|
|
from main import settings
|
|
import tcc
|
|
|
|
trust_mode = cls.get_trust_policy()
|
|
|
|
if trust_mode == TRUST_VERIFY:
|
|
# already checked for existing import and wasn't found, so fail
|
|
raise FatalPSBTIssue("XPUBs in PSBT do not match any existing wallet")
|
|
|
|
# build up an in-memory version of the wallet.
|
|
# TODO: capture address format from an input?
|
|
|
|
assert N == len(xpubs_list)
|
|
assert 1 <= M <= N <= MAX_SIGNERS, 'M/N range'
|
|
my_xfp = settings.get('xfp')
|
|
|
|
expect_chain = chains.current_chain().ctype
|
|
xpubs = []
|
|
has_mine = 0
|
|
|
|
for k, v in xpubs_list:
|
|
xfp, *path = ustruct.unpack_from('<%dI' % (len(k)//4), k, 0)
|
|
xpub = tcc.codecs.b58_encode(v)
|
|
is_mine = cls.check_xpub(xfp, xpub, keypath_to_str(path, skip=0),
|
|
expect_chain, my_xfp, xpubs)
|
|
if is_mine:
|
|
has_mine += 1
|
|
|
|
assert has_mine == 1 # 'my key not included'
|
|
|
|
name = 'PSBT-%d-of-%d' % (M, N)
|
|
ms = cls(name, (M, N), xpubs, chain_type=expect_chain)
|
|
|
|
# may just keep just in-memory version, no approval required, if we are
|
|
# trusting PSBT's today, otherwise caller will need to handle UX w.r.t new wallet
|
|
return ms, (trust_mode != TRUST_PSBT)
|
|
|
|
def format_deriv_paths(self):
|
|
# show either single common derivation path, or indented list of them
|
|
ds = set(d for _,d,_ in self.xpubs)
|
|
unsure = (UNSURE_DERIV in ds)
|
|
|
|
if len(ds) == 1:
|
|
ds = ds.pop()
|
|
else:
|
|
ds = ' ' + '\n '.join(sorted(ds))
|
|
|
|
return unsure, ds
|
|
|
|
async def confirm_import(self):
|
|
# prompt them about a new wallet, let them see details and then commit change.
|
|
M, N = self.M, self.N
|
|
|
|
if M == N == 1:
|
|
exp = 'The one signer must approve spends.'
|
|
if M == N:
|
|
exp = 'All %d co-signers must approve spends.' % N
|
|
elif M == 1:
|
|
exp = 'Any signature from %d co-signers will approve spends.' % N
|
|
else:
|
|
exp = '{M} signatures, from {N} possible co-signers, will be required to approve spends.'.format(M=M, N=N)
|
|
|
|
# Look for duplicate case.
|
|
name_change, diff_items = self.has_similar()
|
|
|
|
if name_change:
|
|
story = 'Update NAME only of existing multisig wallet?'
|
|
elif diff_items:
|
|
# Concern here is overwrite when similar, but we don't overwrite anymore, so
|
|
# more of a warning about funny business.
|
|
story = '''\
|
|
WARNING: This new wallet is very similar to an existing wallet, but will NOT replace it. Consider deleting previous wallet first. Differences: \
|
|
''' + ', '.join(diff_items)
|
|
else:
|
|
story = 'Create new multisig wallet?'
|
|
|
|
_, ds = self.format_deriv_paths()
|
|
|
|
story += '''\n
|
|
Wallet Name:
|
|
{name}
|
|
|
|
Policy: {M} of {N}
|
|
|
|
{exp}
|
|
|
|
Addresses:
|
|
{at}
|
|
|
|
Derivation:
|
|
{deriv}
|
|
|
|
Press (1) to see extended public keys, \
|
|
OK to approve, X to cancel.'''.format(M=M, N=N, name=self.name, exp=exp, deriv=ds,
|
|
at=self.render_addr_fmt(self.addr_fmt))
|
|
|
|
ux_clear_keys(True)
|
|
while 1:
|
|
ch = await ux_show_story(story, escape='1')
|
|
|
|
if ch == '1':
|
|
await self.show_detail(verbose=False)
|
|
continue
|
|
|
|
if ch == 'y':
|
|
# save to nvram, may raise MultisigOutOfSpace
|
|
if name_change:
|
|
name_change.delete()
|
|
self.commit()
|
|
await ux_dramatic_pause("Saved.", 2)
|
|
break
|
|
|
|
return ch
|
|
|
|
async def show_detail(self, verbose=True):
|
|
# Show the xpubs; might be 2k or more rendered.
|
|
msg = uio.StringIO()
|
|
|
|
if verbose:
|
|
msg.write('''
|
|
Policy: {M} of {N}
|
|
Blockchain: {ctype}
|
|
Addresses:
|
|
{at}\n\n'''.format(M=self.M, N=self.N, ctype=self.chain_type,
|
|
at=self.render_addr_fmt(self.addr_fmt)))
|
|
|
|
# concern: the order of keys here is non-deterministic
|
|
for idx, (xfp, deriv, xpub) in enumerate(self.xpubs):
|
|
if idx:
|
|
msg.write('\n---===---\n\n')
|
|
|
|
msg.write('%s:\n %s\n\n%s\n' % (xfp2str(xfp), deriv, xpub))
|
|
|
|
if self.addr_fmt != AF_P2SH:
|
|
# SLIP-132 format [yz]pubs here when not p2sh mode.
|
|
# - has some info as proper bitcoin serialization, but useful still
|
|
node = self.chain.deserialize_node(xpub, AF_P2SH)
|
|
xp = self.chain.serialize_public(node, self.addr_fmt)
|
|
|
|
msg.write('\nSLIP-132 equiv:\n%s\n' % xp)
|
|
|
|
return await ux_show_story(msg, title=self.name)
|
|
|
|
async def no_ms_yet(*a):
|
|
# action for 'no wallets yet' menu item
|
|
await ux_show_story("You don't have any multisig wallets yet.")
|
|
|
|
def psbt_xpubs_policy_chooser():
|
|
# Chooser for trust policy
|
|
ch = [ 'Verify Only', 'Offer Import', 'Trust PSBT']
|
|
|
|
def xset(idx, text):
|
|
from main import settings
|
|
settings.set('pms', idx)
|
|
|
|
return MultisigWallet.get_trust_policy(), ch, xset
|
|
|
|
async def trust_psbt_menu(*a):
|
|
# show a story then go into chooser
|
|
from menu import start_chooser
|
|
|
|
ch = await ux_show_story('''\
|
|
This setting controls what the Coldcard does \
|
|
with the co-signer public keys (XPUB) that may \
|
|
be provided inside a PSBT file. Three choices:
|
|
|
|
- Verify Only. Do not import the xpubs found, but do \
|
|
verify the correct wallet already exists on the Coldcard.
|
|
|
|
- Offer Import. If it's a new multisig wallet, offer to import \
|
|
the details and store them as a new wallet in the Coldcard.
|
|
|
|
- Trust PSBT. Use the wallet data in the PSBT as a temporary,
|
|
multisig wallet, and do not import it. This permits some \
|
|
deniability and additional privacy.
|
|
|
|
When the XPUB data is not provided in the PSBT, regardless of the above, \
|
|
we require the appropriate multisig wallet to already exist \
|
|
on the Coldcard. Default is to 'Offer' unless a multisig wallet already \
|
|
exists, otherwise 'Verify'.''')
|
|
|
|
if ch == 'x': return
|
|
start_chooser(psbt_xpubs_policy_chooser)
|
|
|
|
class MultisigMenu(MenuSystem):
|
|
|
|
@classmethod
|
|
def construct(cls):
|
|
# Dynamic menu with user-defined names of wallets shown
|
|
#from menu import MenuSystem, MenuItem
|
|
from actions import import_multisig
|
|
|
|
if not MultisigWallet.exists():
|
|
rv = [MenuItem('(none setup yet)', f=no_ms_yet)]
|
|
else:
|
|
rv = []
|
|
for ms in MultisigWallet.get_all():
|
|
rv.append(MenuItem('%d/%d: %s' % (ms.M, ms.N, ms.name),
|
|
menu=make_ms_wallet_menu, arg=ms.storage_idx))
|
|
|
|
rv.append(MenuItem('Import from SD', f=import_multisig))
|
|
rv.append(MenuItem('Export XPUB', f=export_multisig_xpubs))
|
|
rv.append(MenuItem('Create Airgapped', f=create_ms_step1))
|
|
rv.append(MenuItem('Trust PSBT?', f=trust_psbt_menu))
|
|
|
|
return rv
|
|
|
|
def update_contents(self):
|
|
# Reconstruct the list of wallets on this dynamic menu, because
|
|
# we added or changed them and are showing that same menu again.
|
|
tmp = self.construct()
|
|
self.replace_items(tmp)
|
|
|
|
|
|
async def make_multisig_menu(*a):
|
|
# list of all multisig wallets, and high-level settings/actions
|
|
from main import pa
|
|
|
|
if pa.is_secret_blank():
|
|
await ux_show_story("You must have wallet seed before creating multisig wallets.")
|
|
return
|
|
|
|
rv = MultisigMenu.construct()
|
|
return MultisigMenu(rv)
|
|
|
|
async def make_ms_wallet_menu(menu, label, item):
|
|
# details, actions on single multisig wallet
|
|
ms = MultisigWallet.get_by_idx(item.arg)
|
|
if not ms: return
|
|
|
|
rv = [
|
|
MenuItem('"%s"' % ms.name, f=ms_wallet_detail, arg=ms),
|
|
MenuItem('View Details', f=ms_wallet_detail, arg=ms),
|
|
|
|
MenuItem('Delete', f=ms_wallet_delete, arg=ms),
|
|
MenuItem('Coldcard Export', f=ms_wallet_ckcc_export, arg=ms),
|
|
MenuItem('Electrum Wallet', f=ms_wallet_electrum_export, arg=ms),
|
|
]
|
|
|
|
return rv
|
|
|
|
async def ms_wallet_delete(menu, label, item):
|
|
ms = item.arg
|
|
|
|
# delete
|
|
if not await ux_confirm("Delete this multisig wallet (%s)?\n\nFunds may be impacted."
|
|
% ms.name):
|
|
await ux_dramatic_pause('Aborted.', 3)
|
|
return
|
|
|
|
ms.delete()
|
|
await ux_dramatic_pause('Deleted.', 3)
|
|
|
|
# update/hide from menu
|
|
#menu.update_contents()
|
|
|
|
from ux import the_ux
|
|
# pop stack
|
|
the_ux.pop()
|
|
|
|
m = the_ux.top_of_stack()
|
|
m.update_contents()
|
|
|
|
async def ms_wallet_ckcc_export(menu, label, item):
|
|
# create a text file with the details; ready for import to next Coldcard
|
|
ms = item.arg
|
|
await ms.export_wallet_file()
|
|
|
|
async def ms_wallet_electrum_export(menu, label, item):
|
|
# create a JSON file that Electrum can use. Challenges:
|
|
# - file contains a derivation path that we don't really know.
|
|
# - electrum is using BIP43 with purpose=48 (purpose48_derivation) to make paths like:
|
|
# m/48'/1'/0'/2'
|
|
# - other signers might not be coldcards (we don't know)
|
|
# solution:
|
|
# - (much earlier) when exporting, include all the paths needed.
|
|
# - when building air-gap, pick address type at that point, and matching path to suit
|
|
# - require a common prefix path here
|
|
# - could check path prefix and addr_fmt make sense together, but meh.
|
|
ms = item.arg
|
|
from actions import electrum_export_story
|
|
|
|
unsure, derivs = ms.format_deriv_paths()
|
|
if unsure:
|
|
return await ux_show_story("We don't know all the derivation paths for "
|
|
"these keys, so cannot create Electrum wallet.")
|
|
|
|
msg = 'The new wallet will have derivation path:\n %s\n and use %s addresses.\n' % (
|
|
derivs, MultisigWallet.render_addr_fmt(ms.addr_fmt) )
|
|
|
|
if await ux_show_story(electrum_export_story(msg)) != 'y':
|
|
return
|
|
|
|
await ms.export_electrum()
|
|
|
|
|
|
async def ms_wallet_detail(menu, label, item):
|
|
# show details of single multisig wallet
|
|
|
|
ms = item.arg
|
|
|
|
return await ms.show_detail()
|
|
|
|
|
|
async def export_multisig_xpubs(*a):
|
|
# WAS: Create a single text file with lots of docs, and all possible useful xpub values.
|
|
# THEN: Just create the one-liner xpub export value they need/want to support BIP45
|
|
# NOW: Export JSON with one xpub per useful address type and semi-standard derivation path
|
|
#
|
|
# Consumer for this file is supposed to be ourselves, when we build on-device multisig.
|
|
#
|
|
from main import settings
|
|
xfp = xfp2str(settings.get('xfp', 0))
|
|
chain = chains.current_chain()
|
|
|
|
fname_pattern = 'ccxp-%s.json' % xfp
|
|
|
|
msg = '''\
|
|
This feature creates a small file containing \
|
|
the extended public keys (XPUB) you would need to join \
|
|
a multisig wallet using the 'Create Airgapped' feature.
|
|
|
|
The public keys exported are:
|
|
|
|
BIP45:
|
|
m/45'
|
|
P2WSH-P2SH:
|
|
m/48'/{coin}'/0'/1'
|
|
P2WSH:
|
|
m/48'/{coin}'/0'/2'
|
|
|
|
OK to continue. X to abort.
|
|
'''.format(coin = chain.b44_cointype)
|
|
|
|
resp = await ux_show_story(msg)
|
|
if resp != 'y': return
|
|
|
|
try:
|
|
with CardSlot() as card:
|
|
fname, nice = card.pick_filename(fname_pattern)
|
|
# do actual write: manual JSON here so more human-readable.
|
|
with open(fname, 'wt') as fp:
|
|
fp.write('{\n')
|
|
with stash.SensitiveValues() as sv:
|
|
for deriv, name, fmt in [
|
|
( "m/45'", 'p2sh', AF_P2SH),
|
|
( "m/48'/{coin}'/0'/1'", 'p2wsh_p2sh', AF_P2WSH_P2SH),
|
|
( "m/48'/{coin}'/0'/2'", 'p2wsh', AF_P2WSH)
|
|
]:
|
|
|
|
dd = deriv.format(coin = chain.b44_cointype)
|
|
node = sv.derive_path(dd)
|
|
xp = chain.serialize_public(node, fmt)
|
|
fp.write(' "%s_deriv": "%s",\n' % (name, dd))
|
|
fp.write(' "%s": "%s",\n' % (name, xp))
|
|
|
|
fp.write(' "xfp": "%s"\n}\n' % xfp)
|
|
|
|
except CardMissingError:
|
|
await needs_microsd()
|
|
return
|
|
except Exception as e:
|
|
await ux_show_story('Failed to write!\n\n\n'+str(e))
|
|
return
|
|
|
|
msg = '''BIP45 multisig xpub file written:\n\n%s''' % nice
|
|
await ux_show_story(msg)
|
|
|
|
def import_xpub(ln):
|
|
# read an xpub/ypub/etc and return BIP32 node and what chain it's on.
|
|
# - can handle any garbage line
|
|
# - returns (node, chain, addr_fmt)
|
|
# - people are using SLIP132 so we need this
|
|
import tcc, chains, ure
|
|
|
|
pat = ure.compile(r'.pub[A-Za-z0-9]+')
|
|
|
|
found = pat.search(ln)
|
|
if not found:
|
|
return None
|
|
|
|
found = found.group(0)
|
|
|
|
for ch in chains.AllChains:
|
|
for kk in ch.slip132:
|
|
if found[0] == ch.slip132[kk].hint:
|
|
try:
|
|
node = tcc.bip32.deserialize(found, ch.slip132[kk].pub, ch.slip132[kk].priv)
|
|
chain = ch
|
|
addr_fmt = kk
|
|
return (node, ch, kk)
|
|
except ValueError:
|
|
pass
|
|
|
|
# looked like one, but fail.
|
|
return None
|
|
|
|
async def ondevice_multisig_create(mode='p2wsh', addr_fmt=AF_P2WSH):
|
|
# collect all xpub- exports on current SD card (must be > 1)
|
|
# - ask for M value
|
|
# - create wallet, save and also export
|
|
# - also create electrum skel to go with that
|
|
# - only expected to work with our ccxp-foo.json export files.
|
|
from actions import file_picker
|
|
import uos, ujson
|
|
from utils import get_filesize
|
|
from main import settings
|
|
|
|
chain = chains.current_chain()
|
|
my_xfp = settings.get('xfp')
|
|
|
|
xpubs = []
|
|
files = []
|
|
has_mine = 0
|
|
deriv = None
|
|
try:
|
|
with CardSlot() as card:
|
|
for path in card.get_paths():
|
|
for fn, ftype, *var in uos.ilistdir(path):
|
|
if ftype == 0x4000:
|
|
# ignore subdirs
|
|
continue
|
|
|
|
if not fn.startswith('ccxp-') or not fn.endswith('.json'):
|
|
# wrong prefix/suffix: ignore
|
|
continue
|
|
|
|
full_fname = path + '/' + fn
|
|
|
|
# Conside file size
|
|
# sigh, OS/filesystem variations
|
|
file_size = var[1] if len(var) == 2 else get_filesize(full_fname)
|
|
|
|
if not (0 <= file_size <= 1000):
|
|
# out of range size
|
|
continue
|
|
|
|
try:
|
|
with open(full_fname, 'rt') as fp:
|
|
vals = ujson.load(fp)
|
|
|
|
ln = vals.get(mode)
|
|
|
|
# value in file is BE32, but we want LE32 internally
|
|
xfp = str2xfp(vals['xfp'])
|
|
if not deriv:
|
|
deriv = cleanup_deriv_path(vals[mode+'_deriv'])
|
|
else:
|
|
assert deriv == vals[mode+'_deriv'], "wrong derivation"
|
|
|
|
is_mine = MultisigWallet.check_xpub(xfp, ln, deriv,
|
|
chain.ctype, my_xfp, xpubs)
|
|
if is_mine:
|
|
has_mine += 1
|
|
|
|
files.append(fn)
|
|
|
|
except CardMissingError:
|
|
raise
|
|
|
|
except Exception as exc:
|
|
# show something for coders, but no user feedback
|
|
sys.print_exception(exc)
|
|
continue
|
|
|
|
except CardMissingError:
|
|
await needs_microsd()
|
|
return
|
|
|
|
# remove dups; easy to happen if you double-tap the export
|
|
delme = set()
|
|
for i in range(len(xpubs)):
|
|
for j in range(len(xpubs)):
|
|
if j in delme: continue
|
|
if i == j: continue
|
|
if xpubs[i] == xpubs[j]:
|
|
delme.add(j)
|
|
if delme:
|
|
xpubs = [x for idx,x in enumerate(xpubs) if idx not in delme]
|
|
|
|
if not xpubs or len(xpubs) == 1 and has_mine:
|
|
await ux_show_story("Unable to find any Coldcard exported keys on this card. Must have filename: ccxp-....json")
|
|
return
|
|
|
|
# add myself if not included already
|
|
if not has_mine:
|
|
with stash.SensitiveValues() as sv:
|
|
node = sv.derive_path(deriv)
|
|
xpubs.append( (my_xfp, deriv, chain.serialize_public(node, AF_P2SH)) )
|
|
else:
|
|
assert has_mine == 1, "same coldcard included"
|
|
|
|
N = len(xpubs)
|
|
|
|
if N > MAX_SIGNERS:
|
|
await ux_show_story("Too many signers, max is %d." % MAX_SIGNERS)
|
|
return
|
|
|
|
# pick useful M value to start
|
|
assert N >= 2
|
|
M = (N - 1) if N < 4 else ((N//2)+1)
|
|
|
|
while 1:
|
|
msg = '''How many need to sign?\n %d of %d
|
|
|
|
Press (7 or 9) to change M value, or OK \
|
|
to continue.
|
|
|
|
If you expected more or less keys (N=%d #files=%d), \
|
|
then check card and file contents.
|
|
|
|
Coldcard multisig setup file and an Electrum wallet file will be created automatically.\
|
|
''' % (M, N, N, len(files))
|
|
|
|
ch = await ux_show_story(msg, escape='123479')
|
|
|
|
if ch in '1234':
|
|
M = min(N, int(ch)) # undocumented shortcut
|
|
elif ch == '9':
|
|
M = min(N, M+1)
|
|
elif ch == '7':
|
|
M = max(1, M-1)
|
|
elif ch == 'x':
|
|
await ux_dramatic_pause('Aborted.', 2)
|
|
return
|
|
elif ch == 'y':
|
|
break
|
|
|
|
# create appropriate object
|
|
assert 1 <= M <= N <= MAX_SIGNERS
|
|
|
|
name = 'CC-%d-of-%d' % (M, N)
|
|
ms = MultisigWallet(name, (M, N), xpubs, chain_type=chain.ctype, addr_fmt=addr_fmt)
|
|
|
|
from auth import NewEnrollRequest, UserAuthorizedAction
|
|
|
|
UserAuthorizedAction.active_request = NewEnrollRequest(ms, auto_export=True)
|
|
|
|
# menu item case: add to stack
|
|
from ux import the_ux
|
|
the_ux.push(UserAuthorizedAction.active_request)
|
|
|
|
async def create_ms_step1(*a):
|
|
# Show story, have them pick address format.
|
|
|
|
ch = await ux_show_story('''\
|
|
Insert SD card with exported XPUB files from at least one other \
|
|
Coldcard. A multisig wallet will be constructed using those keys and \
|
|
this device.
|
|
|
|
Default is P2WSH addresses (segwit), but press (1) for P2WSH-P2SH or (2) for P2SH (legacy) instead.
|
|
''', escape='12')
|
|
|
|
if ch == 'y':
|
|
n, f = 'p2wsh', AF_P2WSH
|
|
elif ch == '1':
|
|
n, f = 'p2wsh_p2sh', AF_P2WSH_P2SH
|
|
elif ch == '2':
|
|
n, f = 'p2sh', AF_P2SH
|
|
else:
|
|
return
|
|
|
|
return await ondevice_multisig_create(n, f)
|
|
|
|
|
|
# EOF
|