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feat(legacy): Validate path at same signing steps as in core.

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Andrew Kozlik 2023-01-03 23:53:43 +01:00 committed by matejcik
parent dc205d7c97
commit d74c9ba0a8
1 changed files with 46 additions and 37 deletions
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83
legacy/firmware/signing.c
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@ -921,6 +921,46 @@ static bool fill_input_script_pubkey(TxInputType *in) {
return true; return true;
} }
static bool validate_path(InputScriptType script_type,
pb_size_t address_n_count, const uint32_t *address_n,
bool has_multisig) {
// Sanity check not critical for security. The main reason for this is that we
// are not comfortable with using the same private key in multiple signature
// schemes (ECDSA and Schnorr) and we want to be sure that the user went
// through a warning screen before we sign the input.
if (!coin_path_check(coin, script_type, address_n_count, address_n,
has_multisig, unlocked_schema, true)) {
if (config_getSafetyCheckLevel() == SafetyCheckLevel_Strict &&
!coin_path_check(coin, script_type, address_n_count, address_n,
has_multisig, unlocked_schema, false)) {
fsm_sendFailure(FailureType_Failure_DataError, _("Forbidden key path"));
signing_abort();
return false;
}
if (!foreign_address_confirmed) {
if (signing_stage < STAGE_REQUEST_3_INPUT) {
if (!fsm_layoutPathWarning()) {
signing_abort();
return false;
}
foreign_address_confirmed = true;
} else {
fsm_sendFailure(FailureType_Failure_ProcessError,
_("Transaction has changed during signing"));
signing_abort();
return false;
}
}
}
return true;
}
static bool input_validate_path(const TxInputType *txi) {
return validate_path(txi->script_type, txi->address_n_count, txi->address_n,
txi->has_multisig);
}
static bool derive_node(InputScriptType script_type, pb_size_t address_n_count, static bool derive_node(InputScriptType script_type, pb_size_t address_n_count,
const uint32_t *address_n, bool has_multisig) { const uint32_t *address_n, bool has_multisig) {
if (!coin_path_check(coin, script_type, address_n_count, address_n, if (!coin_path_check(coin, script_type, address_n_count, address_n,
@ -931,19 +971,6 @@ static bool derive_node(InputScriptType script_type, pb_size_t address_n_count,
return false; return false;
} }
// Sanity check not critical for security. The main reason for this is that we
// are not comfortable with using the same private key in multiple signature
// schemes (ECDSA and Schnorr) and we want to be sure that the user went
// through a warning screen before we sign the input.
if (!foreign_address_confirmed &&
!coin_path_check(coin, script_type, address_n_count, address_n,
has_multisig, unlocked_schema, true)) {
fsm_sendFailure(FailureType_Failure_ProcessError,
_("Transaction has changed during signing"));
signing_abort();
return false;
}
memcpy(&node, &root, sizeof(HDNode)); memcpy(&node, &root, sizeof(HDNode));
if (hdnode_private_ckd_cached(&node, address_n, address_n_count, NULL) == 0) { if (hdnode_private_ckd_cached(&node, address_n, address_n_count, NULL) == 0) {
fsm_sendFailure(FailureType_Failure_ProcessError, fsm_sendFailure(FailureType_Failure_ProcessError,
@ -1543,29 +1570,10 @@ static bool signing_add_input(TxInputType *txinput) {
return false; return false;
} }
if (txinput->script_type != InputScriptType_EXTERNAL &&
!coin_path_check(coin, txinput->script_type, txinput->address_n_count,
txinput->address_n, txinput->has_multisig, true)) {
if (config_getSafetyCheckLevel() == SafetyCheckLevel_Strict &&
!coin_path_check(coin, txinput->script_type, txinput->address_n_count,
txinput->address_n, txinput->has_multisig, false)) {
fsm_sendFailure(FailureType_Failure_DataError, _("Forbidden key path"));
signing_abort();
return false;
}
if (!foreign_address_confirmed) {
if (!fsm_layoutPathWarning()) {
signing_abort();
return false;
}
foreign_address_confirmed = true;
}
}
if (txinput->script_type != InputScriptType_EXTERNAL) { if (txinput->script_type != InputScriptType_EXTERNAL) {
// External inputs should have scriptPubKey set by the host. // External inputs should have scriptPubKey set by the host.
if (!derive_node(txinput) || !fill_input_script_pubkey(txinput)) { if (!input_validate_path(txinput) || !input_derive_node(txinput) ||
!fill_input_script_pubkey(txinput)) {
return false; return false;
} }
} }
@ -2686,7 +2694,8 @@ static bool signing_sign_segwit_input(TxInputType *txinput) {
if (txinput->script_type == InputScriptType_SPENDTAPROOT) { if (txinput->script_type == InputScriptType_SPENDTAPROOT) {
signing_hash_bip341(&info, idx1, signing_hash_type(txinput), hash); signing_hash_bip341(&info, idx1, signing_hash_type(txinput), hash);
if (!tx_info_check_input(&info, txinput) || !input_derive_node(txinput) || if (!input_validate_path(txinput) || !tx_info_check_input(&info, txinput) ||
!input_derive_node(txinput) ||
!signing_sign_bip340(node.private_key, hash)) { !signing_sign_bip340(node.private_key, hash)) {
return false; return false;
} }
@ -2714,8 +2723,8 @@ static bool signing_sign_segwit_input(TxInputType *txinput) {
return false; return false;
} }
if (!tx_info_check_input(&info, txinput) || !input_derive_node(txinput) || if (!input_validate_path(txinput) || !tx_info_check_input(&info, txinput) ||
!fill_input_script_sig(txinput)) { !input_derive_node(txinput) || !fill_input_script_sig(txinput)) {
return false; return false;
} }