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blockchain_blackball: detect spent outputs by partial ring reuse

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moneromooo-monero 2018-08-14 10:57:39 +00:00
parent d6d276c604
commit eb8a51be68
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GPG Key ID: 686F07454D6CEFC3
1 changed files with 35 additions and 0 deletions
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35
src/blockchain_utilities/blockchain_blackball.cpp
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@ -587,6 +587,25 @@ static uint64_t get_ring_instances(MDB_txn *txn, uint64_t amount, const std::vec
return *(const uint64_t*)v.mv_data;
}
static uint64_t get_ring_subset_instances(MDB_txn *txn, uint64_t amount, const std::vector<uint64_t> &ring)
{
uint64_t instances = get_ring_instances(txn, amount, ring);
if (ring.size() > 11)
return instances;
uint64_t extra = 0;
for (uint64_t mask = 1; mask < (1u << ring.size()) - 1; ++mask)
{
std::vector<uint64_t> subset;
subset.reserve(ring.size());
for (size_t i = 0; i < ring.size(); ++i)
if ((mask >> i) & 1)
subset.push_back(ring[i]);
extra += get_ring_instances(txn, amount, subset);
}
return instances + extra;
}
static void set_ring_instances(MDB_txn *txn, uint64_t amount, const std::vector<uint64_t> &ring, uint64_t count)
{
const std::string sring = keep_under_511(compress_ring(amount, ring));
@ -808,6 +827,7 @@ int main(int argc, char* argv[])
"database", available_dbs.c_str(), default_db_type
};
const command_line::arg_descriptor<bool> arg_rct_only = {"rct-only", "Only work on ringCT outputs", false};
const command_line::arg_descriptor<bool> arg_check_subsets = {"check-subsets", "Check ring subsets (very expensive)", false};
const command_line::arg_descriptor<std::vector<std::string> > arg_inputs = {"inputs", "Path to Monero DB, and path to any fork DBs"};
const command_line::arg_descriptor<std::string> arg_db_sync_mode = {
"db-sync-mode"
@ -819,6 +839,7 @@ int main(int argc, char* argv[])
command_line::add_arg(desc_cmd_sett, arg_log_level);
command_line::add_arg(desc_cmd_sett, arg_database);
command_line::add_arg(desc_cmd_sett, arg_rct_only);
command_line::add_arg(desc_cmd_sett, arg_check_subsets);
command_line::add_arg(desc_cmd_sett, arg_db_sync_mode);
command_line::add_arg(desc_cmd_sett, arg_inputs);
command_line::add_arg(desc_cmd_only, command_line::arg_help);
@ -857,6 +878,7 @@ int main(int argc, char* argv[])
output_file_path = command_line::get_arg(vm, arg_blackball_db_dir);
bool opt_rct_only = command_line::get_arg(vm, arg_rct_only);
bool opt_check_subsets = command_line::get_arg(vm, arg_check_subsets);
std::string db_type = command_line::get_arg(vm, arg_database);
if (!cryptonote::blockchain_valid_db_type(db_type))
@ -960,6 +982,18 @@ int main(int argc, char* argv[])
inc_stat(txn, txin.amount ? "pre-rct-duplicate-rings" : "rct-duplicate-rings");
}
}
else if (n == 0 && opt_check_subsets && get_ring_subset_instances(txn, txin.amount, new_ring) >= new_ring.size())
{
for (size_t o = 0; o < new_ring.size(); ++o)
{
const crypto::public_key pkey = get_output_key(cur0, txin.amount, absolute[o]);
MINFO("Blackballing output " << pkey << ", due to being used in " << new_ring.size() << " subsets of " << new_ring.size() << "-rings");
std::cout << "\r" << start_idx << "/" << n_txes << " \r" << std::flush;
blackballs.push_back(pkey);
add_spent_output(txn, output_data(txin.amount, absolute[o]));
inc_stat(txn, txin.amount ? "pre-rct-subset-rings" : "rct-subset-rings");
}
}
else if (n > 0 && get_relative_ring(txn, txin.k_image, relative_ring))
{
MDEBUG("Key image " << txin.k_image << " already seen: rings " <<
@ -1115,6 +1149,7 @@ int main(int argc, char* argv[])
static const struct { const char *key; uint64_t base; } stat_keys[] = {
{ "pre-rct-ring-size-1", pre_rct }, { "rct-ring-size-1", rct },
{ "pre-rct-duplicate-rings", pre_rct }, { "rct-duplicate-rings", rct },
{ "pre-rct-subset-rings", pre_rct }, { "rct-subset-rings", rct },
{ "pre-rct-key-image-attack", pre_rct }, { "rct-key-image-attack", rct },
{ "pre-rct-chain-reaction", pre_rct }, { "rct-chain-reaction", rct },
};