fix: dual-key rate limiting for auth + websocket reconnect guard

- Pass client IP (X-Real-IP header) through Flask to daemon for both
  password login and WebAuthn authenticate-finish endpoints
- Rate limiter now checks both IP and username buckets: IP layer catches
  enumeration/brute-force attacks across multiple usernames; username
  layer protects against single-account targeting from multiple IPs
- Add _wsRefreshing flag to prevent double-scheduling reconnect when
  onclose fires during token refresh; simplify async IIFE to .then()/.catch()
- Reset _wsRefreshing on websocket onopen for safety

daemon/handlers/auth.py

@@ -90,7 +90,8 @@ def auth_login(_request: Any, body: Any) -> dict[str, Any]:
     if not username or not password:
         raise ValueError("username and password are required")
 
-    if not check_login_rate(username):
+    client_ip = body.get("client_ip")
+    if not check_login_rate(username, client_ip):
         raise ValueError("Too many login attempts. Please try again later.")
 
     user = verify_user_password(username, password)
@@ -449,11 +450,12 @@ def webauthn_authenticate_finish(_request: Any, body: Any) -> dict[str, Any]:
     username = body.get("username")
     assertion_response = body.get("assertion_response")
     auth_options = body.get("auth_options")
+    client_ip = body.get("client_ip")
 
     if not username or not assertion_response or not auth_options:
         raise ValueError("username, assertion_response, and auth_options are required")
 
-    if not check_webauthn_rate(username):
+    if not check_webauthn_rate(username, client_ip):
         raise ValueError("Too many WebAuthn attempts. Please try again later.")
 
     try:

lib/auth.py

@@ -394,25 +394,34 @@ _login_limiter = RateLimiter(max_attempts=10, window_seconds=300)
 _webauthn_limiter = RateLimiter(max_attempts=5, window_seconds=600)
 
 
-def check_login_rate(username: str) -> bool:
+def check_login_rate(username: str, client_ip: str | None = None) -> bool:
     """Check if login is rate-limited for the given username.
 
+    Uses dual-key tracking: always records by IP (catches enumeration attacks),
+    additionally records by username (catches legitimate users who forget password).
+
     Args:
         username: The login attempt username.
+        client_ip: The client IP address (from X-Real-IP header).
 
     Returns:
         True if the attempt is allowed, False if rate limited.
     """
+    if client_ip and not _login_limiter.is_allowed(client_ip):
+        return False
     return _login_limiter.is_allowed(username)
 
 
-def check_webauthn_rate(username: str) -> bool:
+def check_webauthn_rate(username: str, client_ip: str | None = None) -> bool:
     """Check if WebAuthn authentication is rate-limited for the given username.
 
     Args:
         username: The WebAuthn attempt username.
+        client_ip: The client IP address (from X-Real-IP header).
 
     Returns:
         True if the attempt is allowed, False if rate limited.
     """
+    if client_ip and not _webauthn_limiter.is_allowed(client_ip):
+        return False
     return _webauthn_limiter.is_allowed(username)

webui/api/auth.py

@@ -49,6 +49,7 @@ def login():
     """
     try:
         body = request.get_json(silent=True) or {}
+        body["client_ip"] = request.headers.get("X-Real-IP") or request.remote_addr
         return _ok(post(POST_AUTH_LOGIN, body))
     except Exception as exc:
         logger.error("Login failed: %s", exc)
@@ -289,6 +290,7 @@ def webauthn_authenticate_finish():
     """
     try:
         body = request.get_json(silent=True) or {}
+        body["client_ip"] = request.headers.get("X-Real-IP") or request.remote_addr
         return _ok(post(POST_AUTH_WEBAUTHN_AUTHENTICATE_FINISH, body))
     except Exception as exc:
         logger.error("WebAuthn authenticate finish failed: %s", exc)

webui/static/hoover/websocket.js

@@ -12,6 +12,7 @@ import { tryRefreshToken } from './api.js?v=12';
 let _wsConn = null;
 let _wsReconnectMs = 0;
 let _wsFailCount = 0;
+let _wsRefreshing = false;
 
 /** Direct onMessage handlers — { topics, handler, unsubscribed }[] */
 const _directHandlers = [];
@@ -44,28 +45,24 @@ function _wsConnect() {
     _wsConn.onopen = () => {
         _wsReconnectMs = 0;
         _wsFailCount = 0;
+        _wsRefreshing = false;
     };
 
     _wsConn.onclose = () => {
         if (!window.__auth_token__) return;
         _wsFailCount++;
 
-        if (_wsFailCount >= 3) {
-            // Attempt token refresh after repeated failures.  The reconnect
-            // is handled inside the IIFE to avoid double-scheduling when
-            // refresh succeeds.
-            (async () => {
-                const ok = await tryRefreshToken();
-                if (ok) {
+        if (_wsFailCount >= 3 && !_wsRefreshing) {
+            _wsRefreshing = true;
+            tryRefreshToken().then(ok => {
+                _wsRefreshing = false;
                 _wsFailCount = 0;
                 _wsReconnectMs = 0;
                 _wsConn = null;
                 setTimeout(_wsConnect, 100);
-                } else {
-                    _wsReconnectMs = Math.min(_wsReconnectMs * 2 + 1000, 15000);
-                    setTimeout(_wsConnect, _wsReconnectMs);
-                }
-            })();
+            }).catch(() => {
+                _wsRefreshing = false;
+            });
             return;
         }