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simplewallet: fix cold signing of split transactions

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They'd be rejected as suspicious as the change goes to more
than one destination. However, split transactions will most
likely include fake zero amount change to random addresses,
so we only consider change with non zero amount for this.
This commit is contained in:
moneromooo-monero 2017-04-02 11:11:18 +01:00
parent aae14a107a
commit 9ae566d0dd
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GPG key ID: 686F07454D6CEFC3
1 changed files with 9 additions and 3 deletions
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12
src/simplewallet/simplewallet.cpp
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@ -3035,6 +3035,7 @@ bool simple_wallet::accept_loaded_tx(const std::function<size_t()> get_num_txes,
size_t min_mixin = ~0; size_t min_mixin = ~0;
std::unordered_map<std::string, uint64_t> dests; std::unordered_map<std::string, uint64_t> dests;
const std::string wallet_address = m_wallet->get_account().get_public_address_str(m_wallet->testnet()); const std::string wallet_address = m_wallet->get_account().get_public_address_str(m_wallet->testnet());
int first_known_non_zero_change_index = -1;
for (size_t n = 0; n < get_num_txes(); ++n) for (size_t n = 0; n < get_num_txes(); ++n)
{ {
const tools::wallet2::tx_construction_data &cd = get_tx(n); const tools::wallet2::tx_construction_data &cd = get_tx(n);
@ -3069,10 +3070,15 @@ bool simple_wallet::accept_loaded_tx(const std::function<size_t()> get_num_txes,
fail_msg_writer() << tr("Claimed change is larger than payment to the change address"); fail_msg_writer() << tr("Claimed change is larger than payment to the change address");
return false; return false;
} }
if (memcmp(&cd.change_dts.addr, &get_tx(0).change_dts.addr, sizeof(cd.change_dts.addr))) if (cd.change_dts.amount > 0)
{ {
fail_msg_writer() << tr("Change does to more than one address"); if (first_known_non_zero_change_index == -1)
return false; first_known_non_zero_change_index = n;
if (memcmp(&cd.change_dts.addr, &get_tx(first_known_non_zero_change_index).change_dts.addr, sizeof(cd.change_dts.addr)))
{
fail_msg_writer() << tr("Change goes to more than one address");
return false;
}
} }
change += cd.change_dts.amount; change += cd.change_dts.amount;
it->second -= cd.change_dts.amount; it->second -= cd.change_dts.amount;