Fix potential redis error when session_id is missing

assemblyline_ui/sio/base.py

@@ -83,16 +83,18 @@ def get_user_info(request_p, session_p):
     src_ip = request_p.headers.get("X-Forwarded-For", request_p.remote_addr)
     sid = get_request_id(request_p)
     uname = None
-    current_session = KV_SESSION.get(session_p.get("session_id", None))
-    if current_session:
-        if config.ui.validate_session_ip and src_ip != current_session.get('ip', None):
-            raise AuthenticationFailure(f"IP {src_ip} does not match session IP {current_session.get('ip', None)}")
-
-        if config.ui.validate_session_useragent and \
-                request_p.headers.get("User-Agent", None) != current_session.get('user_agent', None):
-            raise AuthenticationFailure(f"Un-authenticated connection attempt rejected from ip: {src_ip}")
-
-        uname = current_session['username']
+    session_id = session_p.get("session_id", None)
+    if session_id:
+        current_session = KV_SESSION.get(session_id)
+        if current_session:
+            if config.ui.validate_session_ip and src_ip != current_session.get('ip', None):
+                raise AuthenticationFailure(f"IP {src_ip} does not match session IP {current_session.get('ip', None)}")
+
+            if config.ui.validate_session_useragent and \
+                    request_p.headers.get("User-Agent", None) != current_session.get('user_agent', None):
+                raise AuthenticationFailure(f"Un-authenticated connection attempt rejected from ip: {src_ip}")
+
+            uname = current_session['username']
 
     user_classification = None
     if uname: