Handle `SIGTERM` and `SIGQUIT` shutdown signals. (#7008)

* handle more shutdown signals

* disable Rocket's built-in signal handlers

src/main.rs

@@ -558,6 +558,11 @@ async fn launch_rocket(pool: db::DbPool, extra_debug: bool) -> Result<(), Error>
     let basepath = &CONFIG.domain_path();
 
     let mut config = rocket::Config::from(rocket::Config::figment());
+
+    // We install our own signal handlers below; disable Rocket's built-in handlers
+    config.shutdown.ctrlc = false;
+    config.shutdown.signals.clear();
+
     config.temp_dir = canonicalize(CONFIG.tmp_folder()).unwrap().into();
     config.cli_colors = false; // Make sure Rocket does not color any values for logging.
     config.limits = Limits::new()
@@ -589,11 +594,7 @@ async fn launch_rocket(pool: db::DbPool, extra_debug: bool) -> Result<(), Error>
 
     CONFIG.set_rocket_shutdown_handle(instance.shutdown());
 
-    tokio::spawn(async move {
-        tokio::signal::ctrl_c().await.expect("Error setting Ctrl-C handler");
-        info!("Exiting Vaultwarden!");
-        CONFIG.shutdown();
-    });
+    spawn_shutdown_signal_handler();
 
     #[cfg(all(unix, sqlite))]
     {
@@ -621,6 +622,35 @@ async fn launch_rocket(pool: db::DbPool, extra_debug: bool) -> Result<(), Error>
     Ok(())
 }
 
+#[cfg(unix)]
+fn spawn_shutdown_signal_handler() {
+    tokio::spawn(async move {
+        use tokio::signal::unix::signal;
+
+        let mut sigint = signal(SignalKind::interrupt()).expect("Error setting SIGINT handler");
+        let mut sigterm = signal(SignalKind::terminate()).expect("Error setting SIGTERM handler");
+        let mut sigquit = signal(SignalKind::quit()).expect("Error setting SIGQUIT handler");
+
+        let signal_name = tokio::select! {
+            _ = sigint.recv() => "SIGINT",
+            _ = sigterm.recv() => "SIGTERM",
+            _ = sigquit.recv() => "SIGQUIT",
+        };
+
+        info!("Received {signal_name}, initiating graceful shutdown");
+        CONFIG.shutdown();
+    });
+}
+
+#[cfg(not(unix))]
+fn spawn_shutdown_signal_handler() {
+    tokio::spawn(async move {
+        tokio::signal::ctrl_c().await.expect("Error setting Ctrl-C handler");
+        info!("Received Ctrl-C, initiating graceful shutdown");
+        CONFIG.shutdown();
+    });
+}
+
 fn schedule_jobs(pool: db::DbPool) {
     if CONFIG.job_poll_interval_ms() == 0 {
         info!("Job scheduler disabled.");