diff --git a/include/db/auth.h b/include/db/auth.h
index bdc9a5b..b696041 100644
--- a/include/db/auth.h
+++ b/include/db/auth.h
@@ -15,8 +15,14 @@ extern "C"
     int set_user_password(const char* user_id, const char* password);
 
     int login(const char* user_id, const char* password, int* result);
-    
+
+    int registe(const char* user_id, const char* password);
+
     int delete_user(const char* user_id);
+    
+    int get_user_permission(const char* user_id, int* result);
+    
+    int set_user_permission(const char* user_id, int permission);
 
 #ifdef __cplusplus
 }
diff --git a/src/db/auth.cpp b/src/db/auth.cpp
index 631aeec..a855b3a 100644
--- a/src/db/auth.cpp
+++ b/src/db/auth.cpp
@@ -5,12 +5,28 @@
 #include <print>
 
 #include <leveldb/db.h>
+#include <leveldb/write_batch.h>
 
 using leveldb_ptr = leveldb::DB*;
 
 auto user_db    = leveldb_ptr{nullptr};
 auto iter_round = 10000;
 
+auto filter(const std::string_view id) -> bool
+{
+    return id.contains(':');
+}
+
+auto mangle_user_id(const std::string_view id) -> std::string
+{
+    return std::format("{}:user_id", id);
+}
+
+auto mangle_permission(const std::string_view id) -> std::string
+{
+    return std::format("{}:permission", id);
+}
+
 extern "C"
 {
     auto open_user_db() -> int
@@ -35,8 +51,10 @@ extern "C"
 
     auto check_user_exists(const char* user_id, int* result) -> int
     {
+        if (filter(user_id)) return 0;
+
         auto value  = std::string{};
-        auto status = user_db->Get(leveldb::ReadOptions{}, user_id, &value);
+        auto status = user_db->Get(leveldb::ReadOptions{}, mangle_user_id(user_id), &value);
         if (status.ok()) {
             *result = 1;
         } else if (status.IsNotFound()) {
@@ -50,7 +68,10 @@ extern "C"
 
     auto set_user_password(const char* user_id, const char* password) -> int
     {
-        auto status = user_db->Put(leveldb::WriteOptions{}, user_id, generate_hash(password, iter_round));
+        if (filter(user_id)) return 0;
+
+        auto status =
+            user_db->Put(leveldb::WriteOptions{}, mangle_user_id(user_id), generate_hash(password, iter_round));
         if (!status.ok()) {
             std::println(stderr, "Failed to set user password: {}", status.ToString());
             return 0;
@@ -60,8 +81,10 @@ extern "C"
 
     auto login(const char* user_id, const char* password, int* result) -> int
     {
+        if (filter(user_id)) return 0;
+
         auto value  = std::string{};
-        auto status = user_db->Get(leveldb::ReadOptions{}, user_id, &value);
+        auto status = user_db->Get(leveldb::ReadOptions{}, mangle_user_id(user_id), &value);
         if (!status.ok()) {
             std::println(stderr, "Failed to login: {}", status.ToString());
             return 0;
@@ -70,10 +93,60 @@ extern "C"
         return 1;
     }
 
+    int registe(const char* user_id, const char* password)
+    {
+        if (filter(user_id)) return 0;
+
+        auto batch = leveldb::WriteBatch{};
+        batch.Put(mangle_user_id(user_id), generate_hash(password, iter_round));
+        batch.Put(mangle_permission(user_id), "1");
+        auto status = user_db->Write(leveldb::WriteOptions{}, &batch);
+        if (!status.ok()) {
+            std::println(stderr, "Failed to register: {}", status.ToString());
+            return 0;
+        }
+        return 1;
+    }
+
     auto delete_user(const char* user_id) -> int
     {
-        auto write_options = leveldb::WriteOptions{};
-        auto status        = user_db->Delete(write_options, user_id);
-        return status.ok();
+        if (filter(user_id)) return 0;
+
+        auto batch = leveldb::WriteBatch{};
+        batch.Delete(mangle_user_id(user_id));
+        batch.Delete(mangle_permission(user_id));
+        auto status = user_db->Write(leveldb::WriteOptions{}, &batch);
+        if (!status.ok()) {
+            std::println(stderr, "Failed to delete: {}", status.ToString());
+            return 0;
+        }
+        return 1;
+    }
+
+    int get_user_permission(const char* user_id, int* result)
+    {
+        if (filter(user_id)) return 0;
+
+        auto value  = std::string{};
+        auto status = user_db->Get(leveldb::ReadOptions{}, mangle_permission(user_id), &value);
+        if (status.ok()) {
+            *result = std::stoi(value);
+        } else {
+            std::println(stderr, "Failed to get user permission: {}", status.ToString());
+            return 0;
+        }
+        return 1;
+    }
+
+    int set_user_permission(const char* user_id, int permission)
+    {
+        if (filter(user_id)) return 0;
+
+        auto status = user_db->Put(leveldb::WriteOptions{}, mangle_permission(user_id), std::to_string(permission));
+        if (!status.ok()) {
+            std::println(stderr, "Failed to set user permission: {}", status.ToString());
+            return 0;
+        }
+        return 1;
     }
 }
\ No newline at end of file