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protocol: more restrictive checks on chain entry response

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moneromooo-monero 2020-12-10 14:00:40 +00:00
parent b7425c14c8
commit 0f34cabb98
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GPG Key ID: 686F07454D6CEFC3
1 changed files with 8 additions and 1 deletions
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9
src/cryptonote_protocol/cryptonote_protocol_handler.inl
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@ -2486,7 +2486,7 @@ skip:
drop_connection(context, true, false); drop_connection(context, true, false);
return 1; return 1;
} }
if (arg.total_height < arg.m_block_ids.size() || arg.start_height > arg.total_height - arg.m_block_ids.size()) if (arg.total_height < arg.m_block_ids.size() || arg.start_height > arg.total_height - arg.m_block_ids.size() || arg.start_height >= m_core.get_current_blockchain_height())
{ {
LOG_ERROR_CCONTEXT("sent invalid start/nblocks/height, dropping connection"); LOG_ERROR_CCONTEXT("sent invalid start/nblocks/height, dropping connection");
drop_connection(context, true, false); drop_connection(context, true, false);
@ -2532,8 +2532,15 @@ skip:
context.m_needed_objects.clear(); context.m_needed_objects.clear();
uint64_t added = 0; uint64_t added = 0;
std::unordered_set<crypto::hash> blocks_found;
for (size_t i = 0; i < arg.m_block_ids.size(); ++i) for (size_t i = 0; i < arg.m_block_ids.size(); ++i)
{ {
if (!blocks_found.insert(arg.m_block_ids[i]).second)
{
LOG_ERROR_CCONTEXT("Duplicate blocks in chain entry response, dropping connection");
drop_connection(context, true, false);
return 1;
}
const uint64_t block_weight = arg.m_block_weights.empty() ? 0 : arg.m_block_weights[i]; const uint64_t block_weight = arg.m_block_weights.empty() ? 0 : arg.m_block_weights[i];
context.m_needed_objects.push_back(std::make_pair(arg.m_block_ids[i], block_weight)); context.m_needed_objects.push_back(std::make_pair(arg.m_block_ids[i], block_weight));
if (++added == n_use_blocks) if (++added == n_use_blocks)