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Filter out null WebSocket session attributes #29315

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evil0th opened this issue Oct 13, 2022 · 0 comments
Closed

Filter out null WebSocket session attributes #29315

evil0th opened this issue Oct 13, 2022 · 0 comments
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@rstoyanchev
Labels
in: web Issues in web modules (web, webmvc, webflux, websocket) type: enhancement A general enhancement
Milestone
5.3.24

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@evil0th
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evil0th commented Oct 13, 2022 •
edited by rstoyanchev
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Affects: <Spring Framework version 5.3.22, 5.3.23, maybe earlier>

image

image

my codes

step 0(optional): prepare the spring boot project, add dependency: org.springframework.boot:spring-boot-starter-websocket

step 1: custom HandshakeInterceptor

@Component
public class WebSocketHandshakeInterceptor implements HandshakeInterceptor {
    @Override
    public boolean beforeHandshake(ServerHttpRequest serverHttpRequest, ServerHttpResponse serverHttpResponse, WebSocketHandler webSocketHandler, Map<String, Object> map) throws Exception {
        map.put("uid", null);// null value not controlled from some logic
        return true;
    }
    @Override
    public void afterHandshake(ServerHttpRequest serverHttpRequest, ServerHttpResponse serverHttpResponse, WebSocketHandler webSocketHandler, Exception e) {
    }
}

step2: WebSocketConfigurer

@EnableWebSocket
@Configuration
public class WebSocketConfig implements WebSocketConfigurer {
    @Override
    public void registerWebSocketHandlers(WebSocketHandlerRegistry webSocketHandlerRegistry) {
        webSocketHandlerRegistry.addHandler(new TextWebSocketHandler(), "/ws/**")
                .addInterceptors(new WebSocketHandshakeInterceptor())
                .setAllowedOrigins("*");
    }
}
step3: client html 
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>WebSocker Client</title>
</head>
<body>
<button onclick="contactServer">Click Here</button>
</body>
<script>
    const socket = new WebSocket('ws://localhost:8080/ws');
    socket.addEventListener('open', function (event) {
        socket.send('Connection Established');
    });

    socket.addEventListener('message', function (event) {
        console.log(event.data);
    });

    const contactServer = () => {
        socket.send("Initialize");
    }
</script>
</html>

error log

nested exception is org.springframework.web.socket.server.HandshakeFailureException: Uncaught failure for request http://localhost:8080/ws; nested exception is java.lang.NullPointerException] with root cause

------- origin log -------
2022-10-13 14:57:21.509 DEBUG 8271 --- [nio-8080-exec-1] o.s.w.s.s.s.WebSocketHttpRequestHandler  : GET /ws
2022-10-13 14:57:21.535 TRACE 8271 --- [nio-8080-exec-1] o.s.w.s.s.s.DefaultHandshakeHandler      : Processing request http://localhost:8080/ws with headers=[host:"localhost:8080", connection:"Upgrade", pragma:"no-cache", cache-control:"no-cache", user-agent:"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/105.0.0.0 Safari/537.36", upgrade:"websocket", origin:"null", sec-websocket-version:"13", accept-encoding:"gzip, deflate, br", accept-language:"zh-CN,zh;q=0.9,ko;q=0.8,ja;q=0.7,en;q=0.6", sec-websocket-key:"egMr7FKax7k2Vtkgcv8Ksw==", sec-websocket-extensions:"permessage-deflate; client_max_window_bits"]
2022-10-13 14:57:21.537 TRACE 8271 --- [nio-8080-exec-1] o.s.w.s.s.s.DefaultHandshakeHandler      : Upgrading to WebSocket, subProtocol=null, extensions=[]
2022-10-13 14:57:24.156 ERROR 8271 --- [nio-8080-exec-1] o.a.c.c.C.[.[.[/].[dispatcherServlet]    : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is org.springframework.web.socket.server.HandshakeFailureException: Uncaught failure for request http://localhost:8080/ws; nested exception is java.lang.NullPointerException] with root cause

java.lang.NullPointerException: null
	at java.base/java.util.concurrent.ConcurrentHashMap.putVal(ConcurrentHashMap.java:1011) ~[na:na]
	at java.base/java.util.concurrent.ConcurrentHashMap.putAll(ConcurrentHashMap.java:1089) ~[na:na]
	at org.springframework.web.socket.adapter.AbstractWebSocketSession.<init>(AbstractWebSocketSession.java:65) ~[spring-websocket-5.3.23.jar:5.3.23]
	at org.springframework.web.socket.adapter.standard.StandardWebSocketSession.<init>(StandardWebSocketSession.java:104) ~[spring-websocket-5.3.23.jar:5.3.23]
	at org.springframework.web.socket.server.standard.AbstractStandardUpgradeStrategy.upgrade(AbstractStandardUpgradeStrategy.java:129) ~[spring-websocket-5.3.23.jar:5.3.23]
	at org.springframework.web.socket.server.support.AbstractHandshakeHandler.doHandshake(AbstractHandshakeHandler.java:297) ~[spring-websocket-5.3.23.jar:5.3.23]
	at org.springframework.web.socket.server.support.WebSocketHttpRequestHandler.handleRequest(WebSocketHttpRequestHandler.java:178) ~[spring-websocket-5.3.23.jar:5.3.23]
	at org.springframework.web.servlet.mvc.HttpRequestHandlerAdapter.handle(HttpRequestHandlerAdapter.java:52) ~[spring-webmvc-5.3.23.jar:5.3.23]
	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1071) ~[spring-webmvc-5.3.23.jar:5.3.23]
	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:964) ~[spring-webmvc-5.3.23.jar:5.3.23]
	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) ~[spring-webmvc-5.3.23.jar:5.3.23]
	at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898) ~[spring-webmvc-5.3.23.jar:5.3.23]
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:655) ~[tomcat-embed-core-9.0.65.jar:4.0.FR]
	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) ~[spring-webmvc-5.3.23.jar:5.3.23]
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:764) ~[tomcat-embed-core-9.0.65.jar:4.0.FR]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:227) ~[tomcat-embed-core-9.0.65.jar:9.0.65]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.65.jar:9.0.65]
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) ~[tomcat-embed-websocket-9.0.65.jar:9.0.65]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.65.jar:9.0.65]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.65.jar:9.0.65]
	at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-5.3.23.jar:5.3.23]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117) ~[spring-web-5.3.23.jar:5.3.23]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.65.jar:9.0.65]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.65.jar:9.0.65]
	at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-5.3.23.jar:5.3.23]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117) ~[spring-web-5.3.23.jar:5.3.23]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.65.jar:9.0.65]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.65.jar:9.0.65]
	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-5.3.23.jar:5.3.23]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117) ~[spring-web-5.3.23.jar:5.3.23]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.65.jar:9.0.65]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.65.jar:9.0.65]
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:197) ~[tomcat-embed-core-9.0.65.jar:9.0.65]
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97) ~[tomcat-embed-core-9.0.65.jar:9.0.65]
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541) ~[tomcat-embed-core-9.0.65.jar:9.0.65]
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:135) ~[tomcat-embed-core-9.0.65.jar:9.0.65]
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) ~[tomcat-embed-core-9.0.65.jar:9.0.65]
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78) ~[tomcat-embed-core-9.0.65.jar:9.0.65]
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:360) ~[tomcat-embed-core-9.0.65.jar:9.0.65]
	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:399) ~[tomcat-embed-core-9.0.65.jar:9.0.65]
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) ~[tomcat-embed-core-9.0.65.jar:9.0.65]
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:890) ~[tomcat-embed-core-9.0.65.jar:9.0.65]
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1789) ~[tomcat-embed-core-9.0.65.jar:9.0.65]
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) ~[tomcat-embed-core-9.0.65.jar:9.0.65]
	at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191) ~[tomcat-embed-core-9.0.65.jar:9.0.65]
	at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659) ~[tomcat-embed-core-9.0.65.jar:9.0.65]
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) ~[tomcat-embed-core-9.0.65.jar:9.0.65]
	at java.base/java.lang.Thread.run(Thread.java:833) ~[na:na]

tracking & analysis

found code call path:
AbstractStandardUpgradeStrategy#upgrade->
StandardWebSocketSession session = new StandardWebSocketSession(headers, attrs, localAddr, remoteAddr, user);
->StandardWebSocketSession#constructor->first line super(attributes);

The code where the exception finally occurs:

// org.springframework.web.socket.adapter.AbstractWebSocketSession.java
public AbstractWebSocketSession(@Nullable Map<String, Object> attributes) {
	if (attributes != null) {
		this.attributes.putAll(attributes); // <----- HERE, java.util.concurrent.ConcurrentHashMap put null value occurs NPE
	}
}

It is recommended to add a null value judgment and throw an exception or filter none-null key-value here。
@spring-projects-issues spring-projects-issues added the status: waiting-for-triage An issue we've not yet triaged or decided on label Oct 13, 2022
@sbrannen sbrannen added the in: web Issues in web modules (web, webmvc, webflux, websocket) label Oct 13, 2022
@sbrannen sbrannen added this to the Triage Queue milestone Oct 13, 2022
@rstoyanchev rstoyanchev changed the title Meet NPE when accidentally set a null value to map in a override beforeHandshake method NullPointerException if beforeHandshake adds attribute with null value Oct 24, 2022
@rstoyanchev rstoyanchev self-assigned this Oct 24, 2022
@rstoyanchev rstoyanchev modified the milestones: Triage Queue, 5.3.24 Oct 24, 2022
@rstoyanchev rstoyanchev added type: enhancement A general enhancement and removed status: waiting-for-triage An issue we've not yet triaged or decided on labels Oct 24, 2022
@rstoyanchev rstoyanchev changed the title NullPointerException if beforeHandshake adds attribute with null value Reject null keys/values added to WebSocket session attributes in beforeHandshake Oct 24, 2022
@rstoyanchev rstoyanchev changed the title Reject null keys/values added to WebSocket session attributes in beforeHandshake Filter out null WebSocket session attributes Nov 11, 2022
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@rstoyanchev rstoyanchev

Labels
in: web Issues in web modules (web, webmvc, webflux, websocket) type: enhancement A general enhancement
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Milestone
5.3.24
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@sbrannen @rstoyanchev @evil0th @spring-projects-issues