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// Copyright (c) 2019-2020, The Monero Project
//
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without modification, are
// permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this list of
// conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice, this list
// of conditions and the following disclaimer in the documentation and/or other
// materials provided with the distribution.
//
// 3. Neither the name of the copyright holder nor the names of its contributors may be
// used to endorse or promote products derived from this software without specific
// prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include <stdint.h>
#include <vector>
#include "cryptonote_basic/cryptonote_basic.h"
#include "cryptonote_basic/cryptonote_format_utils.h"
#include "blockchain.h"
#include "tx_sanity_check.h"
#undef MONERO_DEFAULT_LOG_CATEGORY
#define MONERO_DEFAULT_LOG_CATEGORY "verify"
namespace cryptonote
{
bool tx_sanity_check(const cryptonote::blobdata &tx_blob, uint64_t rct_outs_available)
{
cryptonote::transaction tx;
if (!cryptonote::parse_and_validate_tx_from_blob(tx_blob, tx))
{
MERROR("Failed to parse transaction");
return false;
}
if (cryptonote::is_coinbase(tx))
{
MERROR("Transaction is coinbase");
return false;
}
std::set<uint64_t> rct_indices;
size_t n_indices = 0;
for (const auto &txin : tx.vin)
{
if (txin.type() != typeid(cryptonote::txin_to_key))
continue;
const cryptonote::txin_to_key &in_to_key = boost::get<cryptonote::txin_to_key>(txin);
if (in_to_key.amount != 0)
continue;
const std::vector<uint64_t> absolute = cryptonote::relative_output_offsets_to_absolute(in_to_key.key_offsets);
for (uint64_t offset: absolute)
rct_indices.insert(offset);
n_indices += in_to_key.key_offsets.size();
}
return tx_sanity_check(rct_indices, n_indices, rct_outs_available);
}
bool tx_sanity_check(const std::set<uint64_t> &rct_indices, size_t n_indices, uint64_t rct_outs_available)
{
if (n_indices <= 10)
{
MDEBUG("n_indices is only " << n_indices << ", not checking");
return true;
}
if (rct_outs_available < 10000)
return true;
if (rct_indices.size() < n_indices * 8 / 10)
{
MERROR("amount of unique indices is too low (amount of rct indices is " << rct_indices.size() << ", out of total " << n_indices << "indices.");
return false;
}
std::vector<uint64_t> offsets(rct_indices.begin(), rct_indices.end());
uint64_t median = epee::misc_utils::median(offsets);
if (median < rct_outs_available * 6 / 10)
{
MERROR("median offset index is too low (median is " << median << " out of total " << rct_outs_available << "offsets). Transactions should contain a higher fraction of recent outputs.");
return false;
}
return true;
}
}
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