feat: Allow admins to disable the login capability of an account

# Conflicts:
#	src/admin/user/commands.rs

src/admin/user/commands.rs

@@ -280,7 +280,12 @@ pub(super) async fn unsuspend(&self, user_id: String) -> Result {
 }
 
 #[admin_command]
-pub(super) async fn reset_password(&self, username: String, password: Option<String>) -> Result {
+pub(super) async fn reset_password(
+	&self,
+	logout: bool,
+	username: String,
+	password: Option<String>,
+) -> Result {
 	let user_id = parse_local_user_id(self.services, &username)?;
 
 	if user_id == self.services.globals.server_user {
@@ -303,7 +308,18 @@ pub(super) async fn reset_password(&self, username: String, password: Option<Str
 			write!(self, "Successfully reset the password for user {user_id}: `{new_password}`")
 		},
 	}
-	.await
+	.await?;
+
+	if logout {
+		self.services
+			.users
+			.all_device_ids(&user_id)
+			.for_each(|device_id| self.services.users.remove_device(&user_id, device_id))
+			.await;
+		write!(self, "\nAll existing sessions have been logged out.").await?;
+	}
+
+	Ok(())
 }
 
 #[admin_command]
@@ -1044,3 +1060,45 @@ pub(super) async fn logout(&self, user_id: String) -> Result {
 	self.write_str(&format!("User {user_id} has been logged out from all devices."))
 		.await
 }
+
+#[admin_command]
+pub(super) async fn disable_login(&self, user_id: String) -> Result {
+	self.bail_restricted()?;
+	let user_id = parse_local_user_id(self.services, &user_id)?;
+	assert!(
+		self.services.globals.user_is_local(&user_id),
+		"Parsed user_id must be a local user"
+	);
+	if user_id == self.services.globals.server_user {
+		return Err!("Not allowed to disable login for the server service account.",);
+	}
+
+	if !self.services.users.exists(&user_id).await {
+		return Err!("User {user_id} does not exist.");
+	}
+	if self.services.users.is_admin(&user_id).await {
+		return Err!("Admin users cannot have their login disallowed.");
+	}
+	self.services.users.disable_login(&user_id);
+
+	self.write_str(&format!(
+		"{user_id} can no longer log in. Their existing sessions remain unaffected."
+	))
+	.await
+}
+
+#[admin_command]
+pub(super) async fn enable_login(&self, user_id: String) -> Result {
+	self.bail_restricted()?;
+	let user_id = parse_local_user_id(self.services, &user_id)?;
+	assert!(
+		self.services.globals.user_is_local(&user_id),
+		"Parsed user_id must be a local user"
+	);
+	if !self.services.users.exists(&user_id).await {
+		return Err!("User {user_id} does not exist.");
+	}
+	self.services.users.enable_login(&user_id);
+
+	self.write_str(&format!("{user_id} can now log in.")).await
+}

src/admin/user/mod.rs

@@ -20,6 +20,9 @@ pub enum UserCommand {
 
 	/// - Reset user password
 	ResetPassword {
+		/// Log out existing sessions
+		#[arg(short, long)]
+		logout: bool,
 		/// Username of the user for whom the password should be reset
 		username: String,
 		/// New password for the user, if unspecified one is generated
@@ -113,6 +116,22 @@ pub enum UserCommand {
 		user_id: String,
 	},
 
+	/// - Enable login for a user
+	EnableLogin {
+		/// Username of the user to enable login for
+		user_id: String,
+	},
+
+	/// - Disable login for a user
+	///
+	/// Disables login for the specified user without deactivating or locking
+	/// their account. This prevents the user from obtaining new access tokens,
+	/// but does not invalidate existing sessions.
+	DisableLogin {
+		/// Username of the user to disable login for
+		user_id: String,
+	},
+
 	/// - List local users in the database
 	#[clap(alias = "list")]
 	ListUsers,

src/api/client/session.rs

@@ -5,6 +5,7 @@ use axum_client_ip::InsecureClientIp;
 use conduwuit::{
 	Err, Error, Result, debug, err, info,
 	utils::{self, ReadyExt, hash},
+	warn,
 };
 use conduwuit_core::{debug_error, debug_warn};
 use conduwuit_service::{Services, uiaa::SESSION_ID_LENGTH};
@@ -184,6 +185,11 @@ pub(crate) async fn handle_login(
 		return Err!(Request(Unknown("User ID does not belong to this homeserver")));
 	}
 
+	if services.users.is_login_disabled(&user_id).await {
+		warn!(%user_id, "user attempted to log in with a login-disabled account");
+		return Err!(Request(Forbidden("This account is not permitted to log in.")));
+	}
+
 	if cfg!(feature = "ldap") && services.config.ldap.enable {
 		match Box::pin(ldap_login(services, &user_id, &lowercased_user_id, password)).await {
 			| Ok(user_id) => Ok(user_id),

src/database/maps.rs

@@ -394,6 +394,10 @@ pub(super) static MAPS: &[Descriptor] = &[
 		name: "userid_lock",
 		..descriptor::RANDOM_SMALL
 	},
+	Descriptor {
+		name: "userid_login_disabled",
+		..descriptor::RANDOM_SMALL
+	},
 	Descriptor {
 		name: "userid_presenceid",
 		..descriptor::RANDOM_SMALL

src/service/users/mod.rs

@@ -78,6 +78,7 @@ struct Data {
 	userid_password: Arc<Map>,
 	userid_suspension: Arc<Map>,
 	userid_lock: Arc<Map>,
+	userid_login_disabled: Arc<Map>,
 	userid_selfsigningkeyid: Arc<Map>,
 	userid_usersigningkeyid: Arc<Map>,
 	useridprofilekey_value: Arc<Map>,
@@ -117,6 +118,7 @@ impl crate::Service for Service {
 				userid_password: args.db["userid_password"].clone(),
 				userid_suspension: args.db["userid_suspension"].clone(),
 				userid_lock: args.db["userid_lock"].clone(),
+				userid_login_disabled: args.db["userid_login_disabled"].clone(),
 				userid_selfsigningkeyid: args.db["userid_selfsigningkeyid"].clone(),
 				userid_usersigningkeyid: args.db["userid_usersigningkeyid"].clone(),
 				useridprofilekey_value: args.db["useridprofilekey_value"].clone(),
@@ -295,6 +297,18 @@ impl Service {
 		}
 	}
 
+	pub fn disable_login(&self, user_id: &UserId) {
+		self.db.userid_login_disabled.insert(user_id, "1");
+	}
+
+	pub fn enable_login(&self, user_id: &UserId) {
+		self.db.userid_login_disabled.remove(user_id);
+	}
+
+	pub async fn is_login_disabled(&self, user_id: &UserId) -> bool {
+		self.db.userid_login_disabled.get(user_id).await.is_ok()
+	}
+
 	/// Check if account is active, infallible
 	pub async fn is_active(&self, user_id: &UserId) -> bool {
 		!self.is_deactivated(user_id).await.unwrap_or(true)