diff --git a/src/services/authentication.rs b/src/services/authentication.rs
index e04342a4..170cac82 100644
--- a/src/services/authentication.rs
+++ b/src/services/authentication.rs
@@ -5,17 +5,18 @@ use argon2::{Argon2, PasswordHash, PasswordVerifier};
 use jsonwebtoken::{decode, encode, Algorithm, DecodingKey, EncodingKey, Header, Validation};
 use pbkdf2::Pbkdf2;
 
-use super::user::{DbUserProfileRepository, DbUserRepository};
+use super::user::DbUserProfileRepository;
 use crate::config::Configuration;
 use crate::databases::database::{Database, Error};
 use crate::errors::ServiceError;
 use crate::models::user::{UserAuthentication, UserClaims, UserCompact, UserId};
+use crate::services::user::Repository;
 use crate::utils::clock;
 
 pub struct Service {
     configuration: Arc<Configuration>,
     json_web_token: Arc<JsonWebToken>,
-    user_repository: Arc<DbUserRepository>,
+    user_repository: Arc<Box<dyn Repository>>,
     user_profile_repository: Arc<DbUserProfileRepository>,
     user_authentication_repository: Arc<DbUserAuthenticationRepository>,
 }
@@ -24,7 +25,7 @@ impl Service {
     pub fn new(
         configuration: Arc<Configuration>,
         json_web_token: Arc<JsonWebToken>,
-        user_repository: Arc<DbUserRepository>,
+        user_repository: Arc<Box<dyn Repository>>,
         user_profile_repository: Arc<DbUserProfileRepository>,
         user_authentication_repository: Arc<DbUserAuthenticationRepository>,
     ) -> Self {
diff --git a/src/services/category.rs b/src/services/category.rs
index ec3e5ca2..b5b4523f 100644
--- a/src/services/category.rs
+++ b/src/services/category.rs
@@ -1,7 +1,7 @@
 //! Category service.
 use std::sync::Arc;
 
-use super::user::DbUserRepository;
+use super::authorization::{self, ACTION};
 use crate::databases::database::{Category, Database, Error as DatabaseError};
 use crate::errors::ServiceError;
 use crate::models::category::CategoryId;
@@ -9,15 +9,15 @@ use crate::models::user::UserId;
 
 pub struct Service {
     category_repository: Arc<DbCategoryRepository>,
-    user_repository: Arc<DbUserRepository>,
+    authorization_service: Arc<authorization::Service>,
 }
 
 impl Service {
     #[must_use]
-    pub fn new(category_repository: Arc<DbCategoryRepository>, user_repository: Arc<DbUserRepository>) -> Service {
+    pub fn new(category_repository: Arc<DbCategoryRepository>, authorization_service: Arc<authorization::Service>) -> Service {
         Service {
             category_repository,
-            user_repository,
+            authorization_service,
         }
     }
 
@@ -32,13 +32,9 @@ impl Service {
     /// * The category already exists.
     /// * There is a database error.
     pub async fn add_category(&self, category_name: &str, user_id: &UserId) -> Result<i64, ServiceError> {
-        let user = self.user_repository.get_compact(user_id).await?;
-
-        // Check if user is administrator
-        // todo: extract authorization service
-        if !user.administrator {
-            return Err(ServiceError::Unauthorized);
-        }
+        self.authorization_service
+            .authorize(ACTION::AddCategory, Some(*user_id))
+            .await?;
 
         let trimmed_name = category_name.trim();
 
@@ -70,13 +66,9 @@ impl Service {
     /// * The user does not have the required permissions.
     /// * There is a database error.
     pub async fn delete_category(&self, category_name: &str, user_id: &UserId) -> Result<(), ServiceError> {
-        let user = self.user_repository.get_compact(user_id).await?;
-
-        // Check if user is administrator
-        // todo: extract authorization service
-        if !user.administrator {
-            return Err(ServiceError::Unauthorized);
-        }
+        self.authorization_service
+            .authorize(ACTION::DeleteCategory, Some(*user_id))
+            .await?;
 
         match self.category_repository.delete(category_name).await {
             Ok(()) => Ok(()),
diff --git a/src/services/proxy.rs b/src/services/proxy.rs
index 9ea5ef3d..7ac2a475 100644
--- a/src/services/proxy.rs
+++ b/src/services/proxy.rs
@@ -10,18 +10,18 @@ use std::sync::Arc;
 
 use bytes::Bytes;
 
-use super::user::DbUserRepository;
 use crate::cache::image::manager::{Error, ImageCacheService};
 use crate::models::user::UserId;
+use crate::services::user::Repository;
 
 pub struct Service {
     image_cache_service: Arc<ImageCacheService>,
-    user_repository: Arc<DbUserRepository>,
+    user_repository: Arc<Box<dyn Repository>>,
 }
 
 impl Service {
     #[must_use]
-    pub fn new(image_cache_service: Arc<ImageCacheService>, user_repository: Arc<DbUserRepository>) -> Self {
+    pub fn new(image_cache_service: Arc<ImageCacheService>, user_repository: Arc<Box<dyn Repository>>) -> Self {
         Self {
             image_cache_service,
             user_repository,
diff --git a/src/services/settings.rs b/src/services/settings.rs
index a4b0e92e..d587fb9b 100644
--- a/src/services/settings.rs
+++ b/src/services/settings.rs
@@ -1,22 +1,22 @@
 //! Settings service.
 use std::sync::Arc;
 
-use super::user::DbUserRepository;
+use super::authorization::{self, ACTION};
 use crate::config::{Configuration, ConfigurationPublic, Settings};
 use crate::errors::ServiceError;
 use crate::models::user::UserId;
 
 pub struct Service {
     configuration: Arc<Configuration>,
-    user_repository: Arc<DbUserRepository>,
+    authorization_service: Arc<authorization::Service>,
 }
 
 impl Service {
     #[must_use]
-    pub fn new(configuration: Arc<Configuration>, user_repository: Arc<DbUserRepository>) -> Service {
+    pub fn new(configuration: Arc<Configuration>, authorization_service: Arc<authorization::Service>) -> Service {
         Service {
             configuration,
-            user_repository,
+            authorization_service,
         }
     }
 
@@ -26,13 +26,9 @@ impl Service {
     ///
     /// It returns an error if the user does not have the required permissions.
     pub async fn get_all(&self, user_id: &UserId) -> Result<Settings, ServiceError> {
-        let user = self.user_repository.get_compact(user_id).await?;
-
-        // Check if user is administrator
-        // todo: extract authorization service
-        if !user.administrator {
-            return Err(ServiceError::Unauthorized);
-        }
+        self.authorization_service
+            .authorize(ACTION::GetSettings, Some(*user_id))
+            .await?;
 
         let torrust_index_configuration = self.configuration.get_all().await;
 
@@ -45,13 +41,9 @@ impl Service {
     ///
     /// It returns an error if the user does not have the required permissions.
     pub async fn get_all_masking_secrets(&self, user_id: &UserId) -> Result<Settings, ServiceError> {
-        let user = self.user_repository.get_compact(user_id).await?;
-
-        // Check if user is administrator
-        // todo: extract authorization service
-        if !user.administrator {
-            return Err(ServiceError::Unauthorized);
-        }
+        self.authorization_service
+            .authorize(ACTION::GetSettingsSecret, Some(*user_id))
+            .await?;
 
         let mut torrust_index_configuration = self.configuration.get_all().await;
 
diff --git a/src/services/tag.rs b/src/services/tag.rs
index fcbf56c3..e8684b52 100644
--- a/src/services/tag.rs
+++ b/src/services/tag.rs
@@ -1,7 +1,7 @@
 //! Tag service.
 use std::sync::Arc;
 
-use super::user::DbUserRepository;
+use super::authorization::{self, ACTION};
 use crate::databases::database::{Database, Error as DatabaseError, Error};
 use crate::errors::ServiceError;
 use crate::models::torrent_tag::{TagId, TorrentTag};
@@ -9,15 +9,15 @@ use crate::models::user::UserId;
 
 pub struct Service {
     tag_repository: Arc<DbTagRepository>,
-    user_repository: Arc<DbUserRepository>,
+    authorization_service: Arc<authorization::Service>,
 }
 
 impl Service {
     #[must_use]
-    pub fn new(tag_repository: Arc<DbTagRepository>, user_repository: Arc<DbUserRepository>) -> Service {
+    pub fn new(tag_repository: Arc<DbTagRepository>, authorization_service: Arc<authorization::Service>) -> Service {
         Service {
             tag_repository,
-            user_repository,
+            authorization_service,
         }
     }
 
@@ -30,13 +30,7 @@ impl Service {
     /// * The user does not have the required permissions.
     /// * There is a database error.
     pub async fn add_tag(&self, tag_name: &str, user_id: &UserId) -> Result<TagId, ServiceError> {
-        let user = self.user_repository.get_compact(user_id).await?;
-
-        // Check if user is administrator
-        // todo: extract authorization service
-        if !user.administrator {
-            return Err(ServiceError::Unauthorized);
-        }
+        self.authorization_service.authorize(ACTION::AddTag, Some(*user_id)).await?;
 
         let trimmed_name = tag_name.trim();
 
@@ -62,13 +56,9 @@ impl Service {
     /// * The user does not have the required permissions.
     /// * There is a database error.
     pub async fn delete_tag(&self, tag_id: &TagId, user_id: &UserId) -> Result<(), ServiceError> {
-        let user = self.user_repository.get_compact(user_id).await?;
-
-        // Check if user is administrator
-        // todo: extract authorization service
-        if !user.administrator {
-            return Err(ServiceError::Unauthorized);
-        }
+        self.authorization_service
+            .authorize(ACTION::DeleteTag, Some(*user_id))
+            .await?;
 
         match self.tag_repository.delete(tag_id).await {
             Ok(()) => Ok(()),
diff --git a/src/services/torrent.rs b/src/services/torrent.rs
index 606f8550..b98ef90b 100644
--- a/src/services/torrent.rs
+++ b/src/services/torrent.rs
@@ -6,7 +6,6 @@ use serde_derive::{Deserialize, Serialize};
 use url::Url;
 
 use super::category::DbCategoryRepository;
-use super::user::DbUserRepository;
 use crate::config::{Configuration, TrackerMode};
 use crate::databases::database::{Database, Error, Sorting};
 use crate::errors::ServiceError;
@@ -17,6 +16,7 @@ use crate::models::torrent::{Metadata, TorrentId, TorrentListing};
 use crate::models::torrent_file::{DbTorrent, Torrent, TorrentFile};
 use crate::models::torrent_tag::{TagId, TorrentTag};
 use crate::models::user::UserId;
+use crate::services::user::Repository;
 use crate::tracker::statistics_importer::StatisticsImporter;
 use crate::utils::parse_torrent::decode_and_validate_torrent_file;
 use crate::{tracker, AsCSV};
@@ -25,7 +25,7 @@ pub struct Index {
     configuration: Arc<Configuration>,
     tracker_statistics_importer: Arc<StatisticsImporter>,
     tracker_service: Arc<tracker::service::Service>,
-    user_repository: Arc<DbUserRepository>,
+    user_repository: Arc<Box<dyn Repository>>,
     category_repository: Arc<DbCategoryRepository>,
     torrent_repository: Arc<DbTorrentRepository>,
     torrent_info_hash_repository: Arc<DbCanonicalInfoHashGroupRepository>,
@@ -81,7 +81,7 @@ impl Index {
         configuration: Arc<Configuration>,
         tracker_statistics_importer: Arc<StatisticsImporter>,
         tracker_service: Arc<tracker::service::Service>,
-        user_repository: Arc<DbUserRepository>,
+        user_repository: Arc<Box<dyn Repository>>,
         category_repository: Arc<DbCategoryRepository>,
         torrent_repository: Arc<DbTorrentRepository>,
         torrent_info_hash_repository: Arc<DbCanonicalInfoHashGroupRepository>,