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Legacy firmware support for Unchained paths #4324

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Legacy firmware support for Unchained paths #4324

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f160812
feat: check for multisig or segwit on Unchained path.
Shadouts Nov 6, 2024
2915d6e
fix: address feedback concerning a possible regression from previous
Shadouts Nov 20, 2024
8ae3a80
chore: remove empty leading line from changelog
Shadouts Nov 28, 2024
8e12441
fix: remove extraneous has_multisig check
Shadouts Nov 28, 2024
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1 change: 1 addition & 0 deletions legacy/firmware/.changelog.d/4324.added
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Original file line number Diff line number Diff line change
@@ -0,0 +1 @@
Unchained paths for p2wsh multisig
39 changes: 24 additions & 15 deletions legacy/firmware/crypto.c
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Original file line number Diff line number Diff line change
Expand Up @@ -517,7 +517,7 @@ bool coin_path_check(const CoinInfo *coin, InputScriptType script_type,
return valid;
}

if (address_n[0] == PATH_HARDENED + 45) {
if (address_n[0] == PATH_HARDENED + 45 && address_n_count != 6) {
if (address_n_count == 4) {
// m/45' - BIP45 Copay Abandoned Multisig P2SH
// m / purpose' / cosigner_index / change / address_index
Expand Down Expand Up @@ -546,20 +546,6 @@ bool coin_path_check(const CoinInfo *coin, InputScriptType script_type,
valid = valid && (address_n[3] <= PATH_MAX_CHANGE);
valid = valid && (address_n[4] <= PATH_MAX_ADDRESS_INDEX);
}
} else if (address_n_count == 6) {
// Unchained Capital compatibility pattern. Will be removed in the
// future.
// m/45'/coin_type'/account'/[0-1000000]/change/address_index
// m/45'/coin_type/account/[0-1000000]/change/address_index
valid = valid &&
check_cointype(coin, PATH_HARDENED | address_n[1], full_check);
valid = valid && ((address_n[1] & PATH_HARDENED) ==
(address_n[2] & PATH_HARDENED));
valid =
valid && ((address_n[2] & PATH_UNHARDEN_MASK) <= PATH_MAX_ACCOUNT);
valid = valid && (address_n[3] <= 1000000);
valid = valid && (address_n[4] <= PATH_MAX_CHANGE);
valid = valid && (address_n[5] <= PATH_MAX_ADDRESS_INDEX);
} else {
return false;
}
Expand All @@ -573,6 +559,29 @@ bool coin_path_check(const CoinInfo *coin, InputScriptType script_type,
return valid;
}

if (address_n[0] == PATH_HARDENED + 45 && address_n_count == 6) {
// Unchained Capital compatibility pattern.
// m/45'/coin_type'/account'/[0-1000000]/change/address_index
// m/45'/coin_type/account/[0-1000000]/change/address_index
valid =
valid && check_cointype(coin, PATH_HARDENED | address_n[1], full_check);
valid = valid &&
((address_n[1] & PATH_HARDENED) == (address_n[2] & PATH_HARDENED));
valid = valid && ((address_n[2] & PATH_UNHARDEN_MASK) <= PATH_MAX_ACCOUNT);
valid = valid && (address_n[3] <= 1000000);
valid = valid && (address_n[4] <= PATH_MAX_CHANGE);
valid = valid && (address_n[5] <= PATH_MAX_ADDRESS_INDEX);

if (full_check) {
valid = valid && (script_type == InputScriptType_SPENDADDRESS ||
script_type == InputScriptType_SPENDMULTISIG ||
script_type == InputScriptType_SPENDWITNESS);
valid = valid && has_multisig;
}

return valid;
}

if (address_n[0] == PATH_HARDENED + 48) {
valid = valid && (address_n_count == 5 || address_n_count == 6);
valid = valid && check_cointype(coin, address_n[1], full_check);
Expand Down