[Add] Obfuscate executable file content.

common/src/lua_api.cpp

@@ -7,6 +7,7 @@
 #include "session.h"
 #include "machine.h"
 #include "vfs.h"
+#include "util.h"
 
 namespace api {
 
@@ -117,7 +118,7 @@ std::string create_executable(Session& context, const std::string& path,
     parent_dir->children.erase(it);
   }
   vfs_node* new_exec = new_node(filename, EXEC_NODE, parent_dir);
-  new_exec->content = content;
+  new_exec->content = util::xor_string(content);
   parent_dir->children[filename] = new_exec;
   return "";
 }

common/src/machine_manager.cpp

@@ -7,6 +7,7 @@
 #include "machine_manager.h"
 #include "machine.h"
 #include "vfs.h"
+#include "util.h"
 
 vfs_node* copy_vfs_node(vfs_node* original, vfs_node* new_parent) {
   if(!original) {
@@ -42,7 +43,7 @@ MachineManager::MachineManager(DatabaseManager* db_manager) :
       std::string filename_with_ext = entry.path().filename().string();
       std::string filename = filename_with_ext.substr(0, filename_with_ext.find_last_of('.'));
       vfs_node* script_node = new_node(filename, EXEC_NODE, bin);
-      script_node->content = buffer.str();
+      script_node->content = util::xor_string(buffer.str());
       bin->children[filename] = script_node;
       fprintf(stderr, "Loaded executable: /bin/%s\n", filename.c_str());
     }

common/src/session.cpp

@@ -8,7 +8,7 @@
 #include "lua_processor.h"
 #include "machine.h"
 #include "vfs.h"
-
+#include "util.h"
 
 vfs_node* find_node_by_id(vfs_node* root, long long id) {
   if(root->id == id) {
@@ -113,7 +113,8 @@ std::string Session::process_command(const std::string& command) {
   if(command_node) {
     if(command_node->type == EXEC_NODE) {
       bool is_remote = (_session_machine != _home_machine);
-      sol::object result = lua.execute(command_node->content, *this, args, is_remote);
+      std::string deobfuscated_content = util::xor_string(command_node->content);
+      sol::object result = lua.execute(deobfuscated_content, *this, args, is_remote);
       return result.is<std::string>() ? result.as<std::string>()
                                       : "[Script returned non-string value]";
     } else if(command_node->type == DIR_NODE) {

common/src/util.cpp

@@ -0,0 +1,14 @@
+#include "util.h"
+
+namespace util {
+
+std::string xor_string(const std::string& data) {
+  std::string result = data;
+  char key = 'B';
+  for(size_t i = 0; i < data.size(); ++i) {
+    result[i] = data[i] ^ key;
+  }
+  return result;
+}
+
+}

common/src/util.h

@@ -0,0 +1,6 @@
+#pragma once
+#include <string>
+
+namespace util {
+  std::string xor_string(const std::string& data);
+}