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