protocol: drop origin IP if a block fails to verify in sync mode

It would otherwise be possible for a peer to send bad blocks,
then disconnect and reconnect again, escaping bans

4 files changed, 52 insertions, 19 deletions

diff --git a/src/cryptonote_protocol/block_queue.cpp b/src/cryptonote_protocol/block_queue.cpp
index bbde91c1f..2f5b693dd 100644
--- a/src/cryptonote_protocol/block_queue.cpp
+++ b/src/cryptonote_protocol/block_queue.cpp
@@ -52,12 +52,12 @@ namespace std {
 namespace cryptonote
 {
 
-void block_queue::add_blocks(uint64_t height, std::vector<cryptonote::block_complete_entry> bcel, const boost::uuids::uuid &connection_id, float rate, size_t size)
+void block_queue::add_blocks(uint64_t height, std::vector<cryptonote::block_complete_entry> bcel, const boost::uuids::uuid &connection_id, const epee::net_utils::network_address &addr, float rate, size_t size)
 {
   boost::unique_lock<boost::recursive_mutex> lock(mutex);
   std::vector<crypto::hash> hashes;
   bool has_hashes = remove_span(height, &hashes);
-  blocks.insert(span(height, std::move(bcel), connection_id, rate, size));
+  blocks.insert(span(height, std::move(bcel), connection_id, addr, rate, size));
   if (has_hashes)
   {
     for (const crypto::hash &h: hashes)
@@ -69,11 +69,11 @@ void block_queue::add_blocks(uint64_t height, std::vector<cryptonote::block_comp
   }
 }
 
-void block_queue::add_blocks(uint64_t height, uint64_t nblocks, const boost::uuids::uuid &connection_id, boost::posix_time::ptime time)
+void block_queue::add_blocks(uint64_t height, uint64_t nblocks, const boost::uuids::uuid &connection_id, const epee::net_utils::network_address &addr, boost::posix_time::ptime time)
 {
   CHECK_AND_ASSERT_THROW_MES(nblocks > 0, "Empty span");
   boost::unique_lock<boost::recursive_mutex> lock(mutex);
-  blocks.insert(span(height, nblocks, connection_id, time));
+  blocks.insert(span(height, nblocks, connection_id, addr, time));
 }
 
 void block_queue::flush_spans(const boost::uuids::uuid &connection_id, bool all)
@@ -228,7 +228,7 @@ bool block_queue::have(const crypto::hash &hash) const
   return have_blocks.find(hash) != have_blocks.end();
 }
 
-std::pair<uint64_t, uint64_t> block_queue::reserve_span(uint64_t first_block_height, uint64_t last_block_height, uint64_t max_blocks, const boost::uuids::uuid &connection_id, bool sync_pruned_blocks, uint32_t local_pruning_seed, uint32_t pruning_seed, uint64_t blockchain_height, const std::vector<std::pair<crypto::hash, uint64_t>> &block_hashes, boost::posix_time::ptime time)
+std::pair<uint64_t, uint64_t> block_queue::reserve_span(uint64_t first_block_height, uint64_t last_block_height, uint64_t max_blocks, const boost::uuids::uuid &connection_id, const epee::net_utils::network_address &addr, bool sync_pruned_blocks, uint32_t local_pruning_seed, uint32_t pruning_seed, uint64_t blockchain_height, const std::vector<std::pair<crypto::hash, uint64_t>> &block_hashes, boost::posix_time::ptime time)
 {
   boost::unique_lock<boost::recursive_mutex> lock(mutex);
 
@@ -305,7 +305,7 @@ std::pair<uint64_t, uint64_t> block_queue::reserve_span(uint64_t first_block_hei
     return std::make_pair(0, 0);
   }
   MDEBUG("Reserving span " << span_start_height << " - " << (span_start_height + span_length - 1) << " for " << connection_id);
-  add_blocks(span_start_height, span_length, connection_id, time);
+  add_blocks(span_start_height, span_length, connection_id, addr, time);
   set_span_hashes(span_start_height, connection_id, hashes);
   return std::make_pair(span_start_height, span_length);
 }
@@ -354,7 +354,7 @@ void block_queue::set_span_hashes(uint64_t start_height, const boost::uuids::uui
   }
 }
 
-bool block_queue::get_next_span(uint64_t &height, std::vector<cryptonote::block_complete_entry> &bcel, boost::uuids::uuid &connection_id, bool filled) const
+bool block_queue::get_next_span(uint64_t &height, std::vector<cryptonote::block_complete_entry> &bcel, boost::uuids::uuid &connection_id, epee::net_utils::network_address &addr, bool filled) const
 {
   boost::unique_lock<boost::recursive_mutex> lock(mutex);
   if (blocks.empty())
@@ -367,6 +367,7 @@ bool block_queue::get_next_span(uint64_t &height, std::vector<cryptonote::block_
       height = i->start_block_height;
       bcel = i->blocks;
       connection_id = i->connection_id;
+      addr = i->origin;
       return true;
     }
   }
diff --git a/src/cryptonote_protocol/block_queue.h b/src/cryptonote_protocol/block_queue.h
index 57d2a6490..30fb5bc21 100644
--- a/src/cryptonote_protocol/block_queue.h
+++ b/src/cryptonote_protocol/block_queue.h
@@ -36,6 +36,7 @@
 #include <unordered_set>
 #include <boost/thread/recursive_mutex.hpp>
 #include <boost/uuid/uuid.hpp>
+#include "net/net_utils_base.h"
 
 #undef MONERO_DEFAULT_LOG_CATEGORY
 #define MONERO_DEFAULT_LOG_CATEGORY "cn.block_queue"
@@ -57,19 +58,20 @@ namespace cryptonote
       float rate;
       size_t size;
       boost::posix_time::ptime time;
+      epee::net_utils::network_address origin{};
 
-      span(uint64_t start_block_height, std::vector<cryptonote::block_complete_entry> blocks, const boost::uuids::uuid &connection_id, float rate, size_t size):
-        start_block_height(start_block_height), blocks(std::move(blocks)), connection_id(connection_id), nblocks(this->blocks.size()), rate(rate), size(size), time() {}
-      span(uint64_t start_block_height, uint64_t nblocks, const boost::uuids::uuid &connection_id, boost::posix_time::ptime time):
-        start_block_height(start_block_height), connection_id(connection_id), nblocks(nblocks), rate(0.0f), size(0), time(time) {}
+      span(uint64_t start_block_height, std::vector<cryptonote::block_complete_entry> blocks, const boost::uuids::uuid &connection_id, const epee::net_utils::network_address &addr, float rate, size_t size):
+        start_block_height(start_block_height), blocks(std::move(blocks)), connection_id(connection_id), nblocks(this->blocks.size()), rate(rate), size(size), time(boost::date_time::min_date_time), origin(addr) {}
+      span(uint64_t start_block_height, uint64_t nblocks, const boost::uuids::uuid &connection_id, const epee::net_utils::network_address &addr, boost::posix_time::ptime time):
+        start_block_height(start_block_height), connection_id(connection_id), nblocks(nblocks), rate(0.0f), size(0), time(time), origin(addr) {}
 
       bool operator<(const span &s) const { return start_block_height < s.start_block_height; }
     };
     typedef std::set<span> block_map;
 
   public:
-    void add_blocks(uint64_t height, std::vector<cryptonote::block_complete_entry> bcel, const boost::uuids::uuid &connection_id, float rate, size_t size);
-    void add_blocks(uint64_t height, uint64_t nblocks, const boost::uuids::uuid &connection_id, boost::posix_time::ptime time = boost::date_time::min_date_time);
+    void add_blocks(uint64_t height, std::vector<cryptonote::block_complete_entry> bcel, const boost::uuids::uuid &connection_id, const epee::net_utils::network_address &addr, float rate, size_t size);
+    void add_blocks(uint64_t height, uint64_t nblocks, const boost::uuids::uuid &connection_id, const epee::net_utils::network_address &addr, boost::posix_time::ptime time = boost::date_time::min_date_time);
     void flush_spans(const boost::uuids::uuid &connection_id, bool all = false);
     void flush_stale_spans(const std::set<boost::uuids::uuid> &live_connections);
     bool remove_span(uint64_t start_block_height, std::vector<crypto::hash> *hashes = NULL);
@@ -78,12 +80,12 @@ namespace cryptonote
     void print() const;
     std::string get_overview(uint64_t blockchain_height) const;
     bool has_unpruned_height(uint64_t block_height, uint64_t blockchain_height, uint32_t pruning_seed) const;
-    std::pair<uint64_t, uint64_t> reserve_span(uint64_t first_block_height, uint64_t last_block_height, uint64_t max_blocks, const boost::uuids::uuid &connection_id, bool sync_pruned_blocks, uint32_t local_pruning_seed, uint32_t pruning_seed, uint64_t blockchain_height, const std::vector<std::pair<crypto::hash, uint64_t>> &block_hashes, boost::posix_time::ptime time = boost::posix_time::microsec_clock::universal_time());
+    std::pair<uint64_t, uint64_t> reserve_span(uint64_t first_block_height, uint64_t last_block_height, uint64_t max_blocks, const boost::uuids::uuid &connection_id, const epee::net_utils::network_address &addr, bool sync_pruned_blocks, uint32_t local_pruning_seed, uint32_t pruning_seed, uint64_t blockchain_height, const std::vector<std::pair<crypto::hash, uint64_t>> &block_hashes, boost::posix_time::ptime time = boost::posix_time::microsec_clock::universal_time());
     uint64_t get_next_needed_height(uint64_t blockchain_height) const;
     std::pair<uint64_t, uint64_t> get_next_span_if_scheduled(std::vector<crypto::hash> &hashes, boost::uuids::uuid &connection_id, boost::posix_time::ptime &time) const;
     void reset_next_span_time(boost::posix_time::ptime t = boost::posix_time::microsec_clock::universal_time());
     void set_span_hashes(uint64_t start_height, const boost::uuids::uuid &connection_id, std::vector<crypto::hash> hashes);
-    bool get_next_span(uint64_t &height, std::vector<cryptonote::block_complete_entry> &bcel, boost::uuids::uuid &connection_id, bool filled = true) const;
+    bool get_next_span(uint64_t &height, std::vector<cryptonote::block_complete_entry> &bcel, boost::uuids::uuid &connection_id, epee::net_utils::network_address &addr, bool filled = true) const;
     bool has_next_span(const boost::uuids::uuid &connection_id, bool &filled, boost::posix_time::ptime &time) const;
     bool has_next_span(uint64_t height, bool &filled, boost::posix_time::ptime &time, boost::uuids::uuid &connection_id) const;
     size_t get_data_size() const;
diff --git a/src/cryptonote_protocol/cryptonote_protocol_handler.h b/src/cryptonote_protocol/cryptonote_protocol_handler.h
index ee3a67198..b416b86c8 100644
--- a/src/cryptonote_protocol/cryptonote_protocol_handler.h
+++ b/src/cryptonote_protocol/cryptonote_protocol_handler.h
@@ -141,6 +141,7 @@ namespace cryptonote
     bool should_ask_for_pruned_data(cryptonote_connection_context& context, uint64_t first_block_height, uint64_t nblocks, bool check_block_weights) const;
     void drop_connection(cryptonote_connection_context &context, bool add_fail, bool flush_all_spans);
     void drop_connection_with_score(cryptonote_connection_context &context, unsigned int score, bool flush_all_spans);
+    void drop_connections(const epee::net_utils::network_address address);
     bool kick_idle_peers();
     bool check_standby_peers();
     bool update_sync_search();
diff --git a/src/cryptonote_protocol/cryptonote_protocol_handler.inl b/src/cryptonote_protocol/cryptonote_protocol_handler.inl
index c62a0cd31..cb743316a 100644
--- a/src/cryptonote_protocol/cryptonote_protocol_handler.inl
+++ b/src/cryptonote_protocol/cryptonote_protocol_handler.inl
@@ -1257,7 +1257,7 @@ namespace cryptonote
       const boost::posix_time::time_duration dt = now - request_time;
       const float rate = size * 1e6 / (dt.total_microseconds() + 1);
       MDEBUG(context << " adding span: " << arg.blocks.size() << " at height " << start_height << ", " << dt.total_microseconds()/1e6 << " seconds, " << (rate/1024) << " kB/s, size now " << (m_block_queue.get_data_size() + blocks_size) / 1048576.f << " MB");
-      m_block_queue.add_blocks(start_height, arg.blocks, context.m_connection_id, rate, blocks_size);
+      m_block_queue.add_blocks(start_height, arg.blocks, context.m_connection_id, context.m_remote_address, rate, blocks_size);
 
       const crypto::hash last_block_hash = cryptonote::get_block_hash(b);
       context.m_last_known_hash = last_block_hash;
@@ -1358,7 +1358,8 @@ namespace cryptonote
           uint64_t start_height;
           std::vector<cryptonote::block_complete_entry> blocks;
           boost::uuids::uuid span_connection_id;
-          if (!m_block_queue.get_next_span(start_height, blocks, span_connection_id))
+          epee::net_utils::network_address span_origin;
+          if (!m_block_queue.get_next_span(start_height, blocks, span_connection_id, span_origin))
           {
             MDEBUG(context << " no next span found, going back to download");
             break;
@@ -1456,6 +1457,7 @@ namespace cryptonote
           if (!m_core.prepare_handle_incoming_blocks(blocks, pblocks))
           {
             LOG_ERROR_CCONTEXT("Failure in prepare_handle_incoming_blocks");
+            drop_connections(span_origin);
             return 1;
           }
           if (!pblocks.empty() && pblocks.size() != blocks.size())
@@ -1495,6 +1497,7 @@ namespace cryptonote
             {
               if(tvc[i].m_verifivation_failed)
               {
+                drop_connections(span_origin);
                 if (!m_p2p->for_connection(span_connection_id, [&](cryptonote_connection_context& context, nodetool::peerid_type peer_id, uint32_t f)->bool{
                   cryptonote::transaction tx;
                   crypto::hash txid;
@@ -1536,6 +1539,7 @@ namespace cryptonote
 
             if(bvc.m_verifivation_failed)
             {
+              drop_connections(span_origin);
               if (!m_p2p->for_connection(span_connection_id, [&](cryptonote_connection_context& context, nodetool::peerid_type peer_id, uint32_t f)->bool{
                 LOG_PRINT_CCONTEXT_L1("Block verification failed, dropping connection");
                 drop_connection_with_score(context, bvc.m_bad_pow ? P2P_IP_FAILS_BEFORE_BLOCK : 1, true);
@@ -1555,6 +1559,7 @@ namespace cryptonote
             }
             if(bvc.m_marked_as_orphaned)
             {
+              drop_connections(span_origin);
               if (!m_p2p->for_connection(span_connection_id, [&](cryptonote_connection_context& context, nodetool::peerid_type peer_id, uint32_t f)->bool{
                 LOG_PRINT_CCONTEXT_L1("Block received at sync phase was marked as orphaned, dropping connection");
                 drop_connection(context, true, true);
@@ -2173,7 +2178,7 @@ skip:
         const uint64_t first_block_height = context.m_last_response_height - context.m_needed_objects.size() + 1;
         static const uint64_t bp_fork_height = m_core.get_earliest_ideal_height_for_version(8);
         bool sync_pruned_blocks = m_sync_pruned_blocks && first_block_height >= bp_fork_height && m_core.get_blockchain_pruning_seed();
-        span = m_block_queue.reserve_span(first_block_height, context.m_last_response_height, count_limit, context.m_connection_id, sync_pruned_blocks, m_core.get_blockchain_pruning_seed(), context.m_pruning_seed, context.m_remote_blockchain_height, context.m_needed_objects);
+        span = m_block_queue.reserve_span(first_block_height, context.m_last_response_height, count_limit, context.m_connection_id, context.m_remote_address, sync_pruned_blocks, m_core.get_blockchain_pruning_seed(), context.m_pruning_seed, context.m_remote_blockchain_height, context.m_needed_objects);
         MDEBUG(context << " span from " << first_block_height << ": " << span.first << "/" << span.second);
         if (span.second > 0)
         {
@@ -2309,7 +2314,8 @@ skip:
         uint64_t start_height;
         std::vector<cryptonote::block_complete_entry> blocks;
         boost::uuids::uuid span_connection_id;
-        if (m_block_queue.get_next_span(start_height, blocks, span_connection_id, true))
+        epee::net_utils::network_address span_origin;
+        if (m_block_queue.get_next_span(start_height, blocks, span_connection_id, span_origin, true))
         {
           LOG_DEBUG_CC(context, "No other thread is adding blocks, resuming");
           MLOG_PEER_STATE("will try to add blocks next");
@@ -2734,6 +2740,29 @@ skip:
   }
   //------------------------------------------------------------------------------------------------------------------------
   template<class t_core>
+  void t_cryptonote_protocol_handler<t_core>::drop_connections(const epee::net_utils::network_address address)
+  {
+    MWARNING("dropping connections to " << address.str());
+
+    m_p2p->add_host_fail(address, 5);
+
+    std::vector<boost::uuids::uuid> drop;
+    m_p2p->for_each_connection([&](const connection_context& cntxt, nodetool::peerid_type peer_id, uint32_t support_flags) {
+      if (address.is_same_host(cntxt.m_remote_address))
+        drop.push_back(cntxt.m_connection_id);
+      return true;
+    });
+    for (const boost::uuids::uuid &id: drop)
+    {
+      m_block_queue.flush_spans(id, true);
+      m_p2p->for_connection(id, [&](cryptonote_connection_context& context, nodetool::peerid_type peer_id, uint32_t f)->bool{
+        drop_connection(context, true, false);
+        return true;
+      });
+    }
+  }
+  //------------------------------------------------------------------------------------------------------------------------
+  template<class t_core>
   void t_cryptonote_protocol_handler<t_core>::on_connection_close(cryptonote_connection_context &context)
   {
     uint64_t target = 0;