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protocol: stricter checks on received chain hash list

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moneromooo 2020-12-11 11:17:11 +00:00 committed by moneromooo-monero
parent ebdc617408
commit 5d1849a9eb
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2 changed files with 36 additions and 0 deletions
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1
src/cryptonote_basic/connection_context.h
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@ -69,6 +69,7 @@ namespace cryptonote
bool m_anchor;
int32_t m_score;
int m_expect_response;
uint64_t m_expect_height;
};
inline std::string get_protocol_state_string(cryptonote_connection_context::state s)

35
src/cryptonote_protocol/cryptonote_protocol_handler.inl
View file

@ -141,6 +141,7 @@ namespace cryptonote
{
NOTIFY_REQUEST_CHAIN::request r = {};
context.m_needed_objects.clear();
context.m_expect_height = m_core.get_current_blockchain_height();
m_core.get_short_chain_history(r.block_ids);
handler_request_blocks_history( r.block_ids ); // change the limit(?), sleep(?)
r.prune = m_sync_pruned_blocks;
@ -493,6 +494,7 @@ namespace cryptonote
context.m_needed_objects.clear();
context.m_state = cryptonote_connection_context::state_synchronizing;
NOTIFY_REQUEST_CHAIN::request r = {};
context.m_expect_height = m_core.get_current_blockchain_height();
m_core.get_short_chain_history(r.block_ids);
r.prune = m_sync_pruned_blocks;
handler_request_blocks_history( r.block_ids ); // change the limit(?), sleep(?)
@ -773,6 +775,7 @@ namespace cryptonote
context.m_needed_objects.clear();
context.m_state = cryptonote_connection_context::state_synchronizing;
NOTIFY_REQUEST_CHAIN::request r = {};
context.m_expect_height = m_core.get_current_blockchain_height();
m_core.get_short_chain_history(r.block_ids);
handler_request_blocks_history( r.block_ids ); // change the limit(?), sleep(?)
r.prune = m_sync_pruned_blocks;
@ -1168,7 +1171,16 @@ namespace cryptonote
return 1;
}
if (start_height == std::numeric_limits<uint64_t>::max())
{
start_height = boost::get<txin_gen>(b.miner_tx.vin[0]).height;
if (start_height > context.m_expect_height)
{
LOG_ERROR_CCONTEXT("sent block ahead of expected height, dropping connection");
drop_connection(context, false, false);
++m_sync_bad_spans_downloaded;
return 1;
}
}
auto req_it = context.m_requested_objects.find(block_hash);
if(req_it == context.m_requested_objects.end())
@ -1714,6 +1726,7 @@ skip:
LOG_PRINT_CCONTEXT_L2("requesting callback");
context.m_last_request_time = boost::date_time::not_a_date_time;
context.m_expect_response = 0;
context.m_expect_height = 0;
context.m_state = cryptonote_connection_context::state_standby; // we'll go back to adding, then (if we can't), download
++context.m_callback_request_count;
m_p2p->request_callback(context);
@ -2259,6 +2272,7 @@ skip:
}
}
context.m_last_request_time = boost::posix_time::microsec_clock::universal_time();
context.m_expect_height = span.first;
context.m_expect_response = NOTIFY_RESPONSE_GET_OBJECTS::ID;
MLOG_P2P_MESSAGE("-->>NOTIFY_REQUEST_GET_OBJECTS: blocks.size()=" << req.blocks.size()
<< "requested blocks count=" << count << " / " << count_limit << " from " << span.first << ", first hash " << req.blocks.front());
@ -2331,6 +2345,7 @@ skip:
{//we have to fetch more objects ids, request blockchain entry
NOTIFY_REQUEST_CHAIN::request r = {};
context.m_expect_height = m_core.get_current_blockchain_height();
m_core.get_short_chain_history(r.block_ids);
CHECK_AND_ASSERT_MES(!r.block_ids.empty(), false, "Short chain history is empty");
@ -2338,7 +2353,10 @@ skip:
{
// we'll want to start off from where we are on that peer, which may not be added yet
if (context.m_last_known_hash != crypto::null_hash && r.block_ids.front() != context.m_last_known_hash)
{
context.m_expect_height = std::numeric_limits<uint64_t>::max();
r.block_ids.push_front(context.m_last_known_hash);
}
}
handler_request_blocks_history( r.block_ids ); // change the limit(?), sleep(?)
@ -2480,6 +2498,12 @@ skip:
return 1;
}
context.m_expect_response = 0;
if (arg.start_height + 1 > context.m_expect_height) // we expect an overlapping block
{
LOG_ERROR_CCONTEXT("Got NOTIFY_RESPONSE_CHAIN_ENTRY past expected height, dropping connection");
drop_connection(context, true, false);
return 1;
}
context.m_last_request_time = boost::date_time::not_a_date_time;
@ -2527,6 +2551,17 @@ skip:
return 1;
}
std::unordered_set<crypto::hash> hashes;
for (const auto &h: arg.m_block_ids)
{
if (!hashes.insert(h).second)
{
LOG_ERROR_CCONTEXT("sent duplicate block, dropping connection");
drop_connection(context, true, false);
return 1;
}
}
uint64_t n_use_blocks = m_core.prevalidate_block_hashes(arg.start_height, arg.m_block_ids, arg.m_block_weights);
if (n_use_blocks == 0 || n_use_blocks + HASH_OF_HASHES_STEP <= arg.m_block_ids.size())
{