2019-04-12 22:20:20 +02:00
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// Copyright (c) 2019, The Monero Project
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2023-04-13 15:50:13 +02:00
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//
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2019-04-12 22:20:20 +02:00
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// All rights reserved.
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2023-04-13 15:50:13 +02:00
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//
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2019-04-12 22:20:20 +02:00
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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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2019-04-12 22:20:20 +02:00
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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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2019-04-12 22:20:20 +02:00
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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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2023-04-13 15:50:13 +02:00
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#include "tx_sanity_check.h"
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2019-04-12 22:20:20 +02:00
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#include <stdint.h>
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#include <vector>
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#include "blockchain.h"
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#include "common/median.h"
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2020-01-10 16:25:29 +01:00
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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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namespace cryptonote {
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2022-09-23 01:27:12 +02:00
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static auto logcat = log::Cat("verify");
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2022-09-13 08:57:56 +02:00
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bool tx_sanity_check(const std::string& tx_blob, uint64_t rct_outs_available) {
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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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log::error(logcat, "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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log::error(logcat, "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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auto* in_to_key = std::get_if<cryptonote::txin_to_key>(&txin);
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if (!in_to_key)
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continue;
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if (in_to_key->amount != 0)
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continue;
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for (uint64_t offset :
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cryptonote::relative_output_offsets_to_absolute(in_to_key->key_offsets))
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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(
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const std::set<uint64_t>& rct_indices, size_t n_indices, uint64_t rct_outs_available) {
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if (n_indices <= 10) {
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log::debug(logcat, "n_indices is only {}, not checking", n_indices);
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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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log::error(
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logcat,
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"amount of unique indices is too low (amount of rct indices is {}, out of total {} "
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"indices)",
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rct_indices.size(),
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n_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 = tools::median(std::move(offsets));
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if (median < rct_outs_available * 6 / 10) {
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log::error(
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logcat,
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"median offset index is too low (median is {} out of total {}offsets). "
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"Transactions should contain a higher fraction of recent outputs.",
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median,
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rct_outs_available);
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return false;
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}
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return true;
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}
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} // namespace cryptonote
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