rpc: restrict the recent cutoff size in restricted RPC mode

src/rpc/core_rpc_server.cpp

@@ -59,6 +59,8 @@ using namespace epee;
 #define MAX_RESTRICTED_FAKE_OUTS_COUNT 40
 #define MAX_RESTRICTED_GLOBAL_FAKE_OUTS_COUNT 5000
 
+#define OUTPUT_HISTOGRAM_RECENT_CUTOFF_RESTRICTION (3 * 86400) // 3 days max, the wallet requests 1.8 days
+
 namespace
 {
   void add_reason(std::string &reasons, const char *reason)
@@ -1882,6 +1884,13 @@ namespace cryptonote
     if (use_bootstrap_daemon_if_necessary<COMMAND_RPC_GET_OUTPUT_HISTOGRAM>(invoke_http_mode::JON_RPC, "get_output_histogram", req, res, r))
       return r;
 
+    const bool restricted = m_restricted && ctx;
+    if (restricted && req.recent_cutoff > 0 && req.recent_cutoff < (uint64_t)time(NULL) - OUTPUT_HISTOGRAM_RECENT_CUTOFF_RESTRICTION)
+    {
+      res.status = "Recent cutoff is too old";
+      return true;
+    }
+
     std::map<uint64_t, std::tuple<uint64_t, uint64_t, uint64_t>> histogram;
     try
     {