Fix regression: specifying IPC privileges using UID

src/Common/Utility.cpp

@@ -543,7 +543,22 @@ namespace usbguard
     return rulefile_list;
   }
 
-  bool isValidName(const std::string& name)
+  static bool isValidUID(const std::string& uid)
+  {
+    if (uid.empty()) {
+      return false;
+    }
+
+    for (char c : uid) {
+      if (!std::isdigit(c)) {
+        return false;
+      }
+    }
+
+    return true;
+  }
+
+  static bool isValidName(const std::string& name)
   {
     const char* s = name.data();
 
@@ -568,6 +583,10 @@ namespace usbguard
     return true;
   }
 
+  bool isValidNameOrUID(const std::string& input) {
+    return isValidName(input) || isValidUID(input);
+  }
+
 } /* namespace usbguard */
 
 /* vim: set ts=2 sw=2 et */

src/Common/Utility.hpp

@@ -319,12 +319,11 @@ namespace usbguard
   /**
    * @brief Checks whether a given name is a valid group/user name
    *
-   * User/group names must match [A-Za-z_][A-Za-z0-9_-]*[$]
    *
    * @param name Name to check
    * @return True if given name is valid, false otherwise
    */
-  bool isValidName(const std::string& name);
+  bool isValidNameOrUID(const std::string& name);
 
 } /* namespace usbguard */
 

src/Library/public/usbguard/IPCServer.cpp

@@ -36,8 +36,8 @@ namespace usbguard
       throw Exception("IPC access control", "name too long", name);
     }
 
-    if (!isValidName(name)) {
-      throw Exception("IPC access control", "invalid name format", name);
+	if (!isValidNameOrUID(name)) {
+      throw Exception("IPC access control", "invalid name or UID format", name);
     }
   }
 

src/Library/public/usbguard/IPCServer.hpp

@@ -50,9 +50,9 @@ namespace usbguard
     /**
      * @brief Checks whether given name is a valid access control name.
      *
-     * Name is a valid access control name iff:
+     * Name is a valid access control name if:
      *  1. it is not longer then 32 characters
-     *  2. it matches regex [A-Za-z_][A-Za-z0-9_-]*[$]
+     *  2. it is aligned with the syntax of useradd(8)
      *
      * @param name Name to be verified.
      * @throw Exception If \p name is not a valid access control name.