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p2p: sanitize peer lists

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Also remove the delta time fixup, since we now ignore those
as they're attacker controlled
This commit is contained in:
moneromooo-monero 2019-06-18 22:11:18 +00:00
parent c9df9d683a
commit e353e3d757
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GPG key ID: 686F07454D6CEFC3
2 changed files with 26 additions and 17 deletions
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3
src/p2p/net_node.h
View file

@ -349,8 +349,7 @@ namespace nodetool
bool get_local_node_data(basic_node_data& node_data, const network_zone& zone);
//bool get_local_handshake_data(handshake_data& hshd);
bool merge_peerlist_with_local(const std::vector<peerlist_entry>& bs);
bool fix_time_delta(std::vector<peerlist_entry>& local_peerlist, time_t local_time, int64_t& delta);
bool sanitize_peerlist(std::vector<peerlist_entry>& local_peerlist);
bool connections_maker();
bool peer_sync_idle_maker();

40
src/p2p/net_node.inl
View file

@ -1815,21 +1815,32 @@ namespace nodetool
}
//-----------------------------------------------------------------------------------
template<class t_payload_net_handler>
bool node_server<t_payload_net_handler>::fix_time_delta(std::vector<peerlist_entry>& local_peerlist, time_t local_time, int64_t& delta)
bool node_server<t_payload_net_handler>::sanitize_peerlist(std::vector<peerlist_entry>& local_peerlist)
{
//fix time delta
time_t now = 0;
time(&now);
delta = now - local_time;
for(peerlist_entry& be: local_peerlist)
for (size_t i = 0; i < local_peerlist.size(); ++i)
{
if(be.last_seen > local_time)
bool ignore = false;
peerlist_entry &be = local_peerlist[i];
epee::net_utils::network_address &na = be.adr;
if (na.is_loopback() || na.is_local())
{
MWARNING("FOUND FUTURE peerlist for entry " << be.adr.str() << " last_seen: " << be.last_seen << ", local_time(on remote node):" << local_time);
return false;
ignore = true;
}
be.last_seen += delta;
else if (be.adr.get_type_id() == epee::net_utils::ipv4_network_address::get_type_id())
{
const epee::net_utils::ipv4_network_address &ipv4 = na.as<const epee::net_utils::ipv4_network_address>();
if (ipv4.ip() == 0)
ignore = true;
}
if (ignore)
{
MDEBUG("Ignoring " << be.adr.str());
std::swap(local_peerlist[i], local_peerlist[local_peerlist.size() - 1]);
local_peerlist.resize(local_peerlist.size() - 1);
--i;
continue;
}
#ifdef CRYPTONOTE_PRUNING_DEBUG_SPOOF_SEED
be.pruning_seed = tools::make_pruning_seed(1 + (be.adr.as<epee::net_utils::ipv4_network_address>().ip()) % (1ul << CRYPTONOTE_PRUNING_LOG_STRIPES), CRYPTONOTE_PRUNING_LOG_STRIPES);
#endif
@ -1840,9 +1851,8 @@ namespace nodetool
template<class t_payload_net_handler>
bool node_server<t_payload_net_handler>::handle_remote_peerlist(const std::vector<peerlist_entry>& peerlist, time_t local_time, const epee::net_utils::connection_context_base& context)
{
int64_t delta = 0;
std::vector<peerlist_entry> peerlist_ = peerlist;
if(!fix_time_delta(peerlist_, local_time, delta))
if(!sanitize_peerlist(peerlist_))
return false;
const epee::net_utils::zone zone = context.m_remote_address.get_zone();
@ -1855,8 +1865,8 @@ namespace nodetool
}
}
LOG_DEBUG_CC(context, "REMOTE PEERLIST: TIME_DELTA: " << delta << ", remote peerlist size=" << peerlist_.size());
LOG_DEBUG_CC(context, "REMOTE PEERLIST: " << print_peerlist_to_string(peerlist_));
LOG_DEBUG_CC(context, "REMOTE PEERLIST: remote peerlist size=" << peerlist_.size());
LOG_DEBUG_CC(context, "REMOTE PEERLIST: " << ENDL << print_peerlist_to_string(peerlist_));
return m_network_zones.at(context.m_remote_address.get_zone()).m_peerlist.merge_peerlist(peerlist_);
}
//-----------------------------------------------------------------------------------