Merge pull request #92 from wowario/monero

DoS/RPC fixes [#4438]

contrib/epee/include/storages/portable_storage_from_bin.h

@@ -59,6 +59,7 @@ namespace epee
       storage_entry load_storage_entry();
       void read(section& sec);
       void read(std::string& str);
+      void read(array_entry &ae);
     private:
       struct recursuion_limitation_guard
       {
@@ -114,6 +115,7 @@ namespace epee
     void throwable_buffer_reader::read(t_pod_type& pod_val)
     {
       RECURSION_LIMITATION();
+      static_assert(std::is_pod<t_pod_type>::value, "POD type expected");
       read(&pod_val, sizeof(pod_val));
     }
     
@@ -277,5 +279,11 @@ namespace epee
       m_ptr+=len;
       m_count -= len;
     }
+    inline
+    void throwable_buffer_reader::read(array_entry &ae)
+    {
+      RECURSION_LIMITATION();
+      CHECK_AND_ASSERT_THROW_MES(false, "Reading array entry is not supported");
+    }
   }
 }

contrib/epee/include/storages/portable_storage_from_json.h

@@ -30,6 +30,8 @@
 #include "parserse_base_utils.h"
 #include "file_io_utils.h"
 
+#define EPEE_JSON_RECURSION_LIMIT_INTERNAL 100
+
 namespace epee
 {
   using namespace misc_utils::parse;
@@ -44,8 +46,9 @@ namespace epee
         ASSERT_MES_AND_THROW("json parse error");
       }*/
       template<class t_storage>
-      inline void run_handler(typename t_storage::hsection current_section, std::string::const_iterator& sec_buf_begin, std::string::const_iterator buf_end, t_storage& stg)
+      inline void run_handler(typename t_storage::hsection current_section, std::string::const_iterator& sec_buf_begin, std::string::const_iterator buf_end, t_storage& stg, unsigned int recursion)
       {
+        CHECK_AND_ASSERT_THROW_MES(recursion < EPEE_JSON_RECURSION_LIMIT_INTERNAL, "Wrong JSON data: recursion limitation (" << EPEE_JSON_RECURSION_LIMIT_INTERNAL << ") exceeded");
 
         std::string::const_iterator sub_element_start;
         std::string name;        
@@ -157,7 +160,7 @@ namespace epee
               //sub section here
               typename t_storage::hsection new_sec = stg.open_section(name, current_section, true);
               CHECK_AND_ASSERT_THROW_MES(new_sec, "Failed to insert new section in json: " << std::string(it, buf_end));
-              run_handler(new_sec, it, buf_end, stg);
+              run_handler(new_sec, it, buf_end, stg, recursion + 1);
               state = match_state_wonder_after_value;
             }else if(*it == '[')
             {//array of something
@@ -186,7 +189,7 @@ namespace epee
               typename t_storage::hsection new_sec = nullptr;
               h_array = stg.insert_first_section(name, new_sec, current_section);
               CHECK_AND_ASSERT_THROW_MES(h_array&&new_sec, "failed to create new section");
-              run_handler(new_sec, it, buf_end, stg);
+              run_handler(new_sec, it, buf_end, stg, recursion + 1);
               state = match_state_array_after_value;
               array_md = array_mode_sections;
             }else if(*it == '"')
@@ -260,7 +263,7 @@ namespace epee
                 typename t_storage::hsection new_sec = NULL;
                 bool res = stg.insert_next_section(h_array, new_sec);
                 CHECK_AND_ASSERT_THROW_MES(res&&new_sec, "failed to insert next section");
-                run_handler(new_sec, it, buf_end, stg);
+                run_handler(new_sec, it, buf_end, stg, recursion + 1);
                 state = match_state_array_after_value;
               }else CHECK_ISSPACE();
               break;
@@ -362,7 +365,7 @@ namespace epee
         std::string::const_iterator sec_buf_begin  = buff_json.begin();
         try
         {
-          run_handler(nullptr, sec_buf_begin, buff_json.end(), stg);
+          run_handler(nullptr, sec_buf_begin, buff_json.end(), stg, 0);
           return true;
         }
         catch(const std::exception& ex)

src/wallet/wallet2.cpp

@@ -1120,6 +1120,7 @@ void wallet2::process_new_transaction(const crypto::hash &txid, const cryptonote
   size_t pk_index = 0;
   std::vector<tx_scan_info_t> tx_scan_info(tx.vout.size());
   std::deque<bool> output_found(tx.vout.size(), false);
+  uint64_t total_received_1 = 0;
   while (!tx.vout.empty())
   {
     // if tx.vout is not empty, we loop through all tx pubkeys
@@ -1265,6 +1266,7 @@ void wallet2::process_new_transaction(const crypto::hash &txid, const cryptonote
             + ", m_transfers.size() is " + boost::lexical_cast<std::string>(m_transfers.size()));
         if (kit == m_pub_keys.end())
         {
+          uint64_t amount = tx.vout[o].amount ? tx.vout[o].amount : tx_scan_info[o].amount;
           if (!pool)
           {
 	    m_transfers.push_back(boost::value_initialized<transfer_details>());
@@ -1277,14 +1279,13 @@ void wallet2::process_new_transaction(const crypto::hash &txid, const cryptonote
             td.m_key_image = tx_scan_info[o].ki;
             td.m_key_image_known = !m_watch_only && !m_multisig;
             td.m_key_image_partial = m_multisig;
-            td.m_amount = tx.vout[o].amount;
+            td.m_amount = amount;
             td.m_pk_index = pk_index - 1;
             td.m_subaddr_index = tx_scan_info[o].received->index;
             expand_subaddresses(tx_scan_info[o].received->index);
-            if (td.m_amount == 0)
+            if (tx.vout[o].amount == 0)
             {
               td.m_mask = tx_scan_info[o].mask;
-              td.m_amount = tx_scan_info[o].amount;
               td.m_rct = true;
             }
             else if (miner_tx && tx.version == 2)
@@ -1312,6 +1313,7 @@ void wallet2::process_new_transaction(const crypto::hash &txid, const cryptonote
 	    if (0 != m_callback)
 	      m_callback->on_money_received(height, txid, tx, td.m_amount, td.m_subaddr_index);
           }
+          total_received_1 += amount;
         }
 	else if (m_transfers[kit->second].m_spent || m_transfers[kit->second].amount() >= tx_scan_info[o].amount)
         {
@@ -1319,6 +1321,9 @@ void wallet2::process_new_transaction(const crypto::hash &txid, const cryptonote
               << " from received " << print_money(tx_scan_info[o].amount) << " output already exists with "
               << (m_transfers[kit->second].m_spent ? "spent" : "unspent") << " "
               << print_money(m_transfers[kit->second].amount()) << " in tx " << m_transfers[kit->second].m_txid << ", received output ignored");
+          THROW_WALLET_EXCEPTION_IF(tx_money_got_in_outs[tx_scan_info[o].received->index] < tx_scan_info[o].amount,
+              error::wallet_internal_error, "Unexpected values of new and old outputs");
+          tx_money_got_in_outs[tx_scan_info[o].received->index] -= tx_scan_info[o].amount;
         }
         else
         {
@@ -1326,8 +1331,14 @@ void wallet2::process_new_transaction(const crypto::hash &txid, const cryptonote
               << " from received " << print_money(tx_scan_info[o].amount) << " output already exists with "
               << print_money(m_transfers[kit->second].amount()) << ", replacing with new output");
           // The new larger output replaced a previous smaller one
-          tx_money_got_in_outs[tx_scan_info[o].received->index] -= tx_scan_info[o].amount;
+          THROW_WALLET_EXCEPTION_IF(tx_money_got_in_outs[tx_scan_info[o].received->index] < tx_scan_info[o].amount,
-
+              error::wallet_internal_error, "Unexpected values of new and old outputs");
+          THROW_WALLET_EXCEPTION_IF(m_transfers[kit->second].amount() > tx_scan_info[o].amount,
+              error::wallet_internal_error, "Unexpected values of new and old outputs");
+          tx_money_got_in_outs[tx_scan_info[o].received->index] -= m_transfers[kit->second].amount();
+
+          uint64_t amount = tx.vout[o].amount ? tx.vout[o].amount : tx_scan_info[o].amount;
+          uint64_t extra_amount = amount - m_transfers[kit->second].amount();
           if (!pool)
           {
             transfer_details &td = m_transfers[kit->second];
@@ -1336,14 +1347,13 @@ void wallet2::process_new_transaction(const crypto::hash &txid, const cryptonote
 	    td.m_global_output_index = o_indices[o];
 	    td.m_tx = (const cryptonote::transaction_prefix&)tx;
 	    td.m_txid = txid;
-            td.m_amount = tx.vout[o].amount;
+            td.m_amount = amount;
             td.m_pk_index = pk_index - 1;
             td.m_subaddr_index = tx_scan_info[o].received->index;
             expand_subaddresses(tx_scan_info[o].received->index);
-            if (td.m_amount == 0)
+            if (tx.vout[o].amount == 0)
             {
               td.m_mask = tx_scan_info[o].mask;
-              td.m_amount = tx_scan_info[o].amount;
               td.m_rct = true;
             }
             else if (miner_tx && tx.version == 2)
@@ -1370,6 +1380,7 @@ void wallet2::process_new_transaction(const crypto::hash &txid, const cryptonote
 	    if (0 != m_callback)
 	      m_callback->on_money_received(height, txid, tx, td.m_amount, td.m_subaddr_index);
           }
+          total_received_1 += extra_amount;
         }
       }
     }
@@ -1493,6 +1504,20 @@ void wallet2::process_new_transaction(const crypto::hash &txid, const cryptonote
       LOG_PRINT_L2("Found unencrypted payment ID: " << payment_id);
     }
 
+    uint64_t total_received_2 = 0;
+    for (const auto& i : tx_money_got_in_outs)
+      total_received_2 += i.second;
+    if (total_received_1 != total_received_2)
+    {
+      const el::Level level = el::Level::Warning;
+      MCLOG_RED(level, "global", "**********************************************************************");
+      MCLOG_RED(level, "global", "Consistency failure in amounts received");
+      MCLOG_RED(level, "global", "Check transaction " << txid);
+      MCLOG_RED(level, "global", "**********************************************************************");
+      exit(1);
+      return;
+    }
+
     for (const auto& i : tx_money_got_in_outs)
     {
       payment_details payment;