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fix(legacy): Stricter Bitcoin transaction checks.

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This commit is contained in:
Andrew Kozlik 2022-03-11 12:25:53 +01:00 committed by Martin Milata
parent 253c7a0cc0
commit 9a20edb17d
3 changed files with 48 additions and 13 deletions
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30
legacy/firmware/signing.c
View File

@ -1321,7 +1321,12 @@ static void tx_info_finish(TxInfo *tx_info) {
static bool signing_add_input(TxInputType *txinput) {
// hash all input data to check it later (relevant for fee computation)
tx_input_check_hash(&hasher_check, txinput);
if (!tx_input_check_hash(&hasher_check, txinput)) {
fsm_sendFailure(FailureType_Failure_ProcessError,
_("Failed to hash input"));
signing_abort();
return false;
}
if (!fsm_checkCoinPath(coin, txinput->script_type, txinput->address_n_count,
txinput->address_n, txinput->has_multisig, true)) {
@ -1585,8 +1590,13 @@ static bool signing_add_orig_input(TxInputType *orig_input) {
return false;
}
// The first original input that has address_n set and a signature gets chosen
// as the verification input. Set script_sig for legacy digest computation.
// The first original non-multisig input that has address_n set and a
// signature gets chosen as the verification input. Set script_sig for legacy
// digest computation.
// NOTE: Supporting replacement transactions where all internal inputs are
// multisig would require checking the signatures of all of the original
// internal inputs or not allowing unverified external inputs in transactions
// where multisig inputs are present.
if (!have_orig_verif_input && orig_input->address_n_count != 0 &&
!orig_input->has_multisig &&
((orig_input->has_script_sig && orig_input->script_sig.size != 0) ||
@ -2598,7 +2608,12 @@ void signing_txack(TransactionType *tx) {
if (idx1 == 0) {
hasher_Reset(&hasher_check);
}
tx_input_check_hash(&hasher_check, tx->inputs);
if (!tx_input_check_hash(&hasher_check, tx->inputs)) {
fsm_sendFailure(FailureType_Failure_ProcessError,
_("Failed to hash input"));
signing_abort();
return;
}
memcpy(&input, tx->inputs, sizeof(TxInputType));
@ -2803,7 +2818,12 @@ void signing_txack(TransactionType *tx) {
hasher_Reset(&hasher_check);
}
// check inputs are the same as those in phase 1
tx_input_check_hash(&hasher_check, tx->inputs);
if (!tx_input_check_hash(&hasher_check, tx->inputs)) {
fsm_sendFailure(FailureType_Failure_ProcessError,
_("Failed to hash input"));
signing_abort();
return;
}
if (idx2 == idx1) {
if (!tx_info_check_input(&info, &tx->inputs[0]) ||
!derive_node(&tx->inputs[0]) ||

29
legacy/firmware/transaction.c
View File

@ -556,22 +556,37 @@ uint32_t serialize_script_multisig(const CoinInfo *coin,
}
// tx methods
void tx_input_check_hash(Hasher *hasher, const TxInputType *input) {
hasher_Update(hasher, input->prev_hash.bytes, sizeof(input->prev_hash.bytes));
hasher_Update(hasher, (const uint8_t *)&input->prev_index,
sizeof(input->prev_index));
hasher_Update(hasher, (const uint8_t *)&input->script_type,
sizeof(input->script_type));
bool tx_input_check_hash(Hasher *hasher, const TxInputType *input) {
hasher_Update(hasher, (const uint8_t *)&input->address_n_count,
sizeof(input->address_n_count));
for (int i = 0; i < input->address_n_count; ++i)
hasher_Update(hasher, (const uint8_t *)&input->address_n[i],
sizeof(input->address_n[0]));
hasher_Update(hasher, input->prev_hash.bytes, sizeof(input->prev_hash.bytes));
hasher_Update(hasher, (const uint8_t *)&input->prev_index,
sizeof(input->prev_index));
tx_script_hash(hasher, input->script_sig.size, input->script_sig.bytes);
hasher_Update(hasher, (const uint8_t *)&input->sequence,
sizeof(input->sequence));
hasher_Update(hasher, (const uint8_t *)&input->script_type,
sizeof(input->script_type));
uint8_t multisig_fp[32] = {0};
if (input->has_multisig) {
if (cryptoMultisigFingerprint(&input->multisig, multisig_fp) == 0) {
// Invalid multisig parameters.
return false;
}
}
hasher_Update(hasher, multisig_fp, sizeof(multisig_fp));
hasher_Update(hasher, (const uint8_t *)&input->amount, sizeof(input->amount));
tx_script_hash(hasher, input->witness.size, input->witness.bytes);
hasher_Update(hasher, (const uint8_t *)&input->has_orig_hash,
sizeof(input->has_orig_hash));
hasher_Update(hasher, input->orig_hash.bytes, sizeof(input->orig_hash.bytes));
hasher_Update(hasher, (const uint8_t *)&input->orig_index,
sizeof(input->orig_index));
tx_script_hash(hasher, input->script_pubkey.size, input->script_pubkey.bytes);
return;
return true;
}
uint32_t tx_prevout_hash(Hasher *hasher, const TxInputType *input) {

2
legacy/firmware/transaction.h
View File

@ -78,7 +78,7 @@ int compile_output(const CoinInfo *coin, AmountUnit amount_unit,
int fill_input_script_pubkey(const CoinInfo *coin, const HDNode *root,
TxInputType *in);
void tx_input_check_hash(Hasher *hasher, const TxInputType *input);
bool tx_input_check_hash(Hasher *hasher, const TxInputType *input);
uint32_t tx_prevout_hash(Hasher *hasher, const TxInputType *input);
uint32_t tx_amount_hash(Hasher *hasher, const TxInputType *input);
uint32_t tx_script_hash(Hasher *hasher, uint32_t size, const uint8_t *data);