Spring中的Websocket身份验证和授权

一、需要了解的事项

• http和WebSocket的安全链和安全配置是完全独立的。
• SpringAuthenticationProvider根本不参与 Websocket 身份验证。
• 将要给出的示例中，身份验证不会发生在 HTTP 协商端点上，因为 JavaScript STOMP（websocket）库不会随 HTTP 请求一起发送必要的身份验证标头。
• 一旦在 CONNECT 请求上设置，用户( simpUser) 将被存储在 websocket 会话中，并且以后的消息将不再需要进行身份验证。

二、依赖

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-websocket</artifactId>
</dependency>
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-messaging</artifactId>
</dependency>
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-security</artifactId>
</dependency>
<dependency>
    <groupId>org.springframework.security</groupId>
    <artifactId>spring-security-messaging</artifactId>
</dependency>

三、WebSocket 配置

3.1 、简单的消息代理

@Configuration
@EnableWebSocketMessageBroker
public class WebSocketConfig extends WebSocketMessageBrokerConfigurer {
    @Override
    public void configureMessageBroker(final MessageBrokerRegistry config) {
        config.enableSimpleBroker("/queue/topic");
        config.setApplicationDestinationPrefixes("/app");
    }

    @Override
    public void registerStompEndpoints(final StompEndpointRegistry registry) {
        registry.addEndpoint("stomp"); 
        setAllowedOrigins("*")
    }
}

3.2 、Spring安全配置

由于 Stomp 协议依赖于第一个 HTTP 请求，因此需要授权对 stomp 握手端点的 HTTP 调用。

@Configuration
public class WebSecurityConfig extends WebSecurityConfigurerAdapter {
    @Override
    protected void configure(final HttpSecurity http) throws Exception
        http.httpBasic().disable()
                .sessionManagement().sessionCreationPolicy(SessionCreationPolicy.STATELESS).and()
                .authorizeRequests().antMatchers("/stomp").permitAll()
                .anyRequest().denyAll();
    }
}

然后创建一个负责验证用户身份的服务。

@Component
public class WebSocketAuthenticatorService {
    public UsernamePasswordAuthenticationToken getAuthenticatedOrFail(final String  username, final String password) throws AuthenticationException {
        if (username == null || username.trim().isEmpty()) {
            throw new AuthenticationCredentialsNotFoundException("Username was null or empty.");
        }
        if (password == null || password.trim().isEmpty()) {
            throw new AuthenticationCredentialsNotFoundException("Password was null or empty.");
        }
    
        if (fetchUserFromDb(username, password) == null) {
            throw new BadCredentialsException("Bad credentials for user " + username);
        }

      
        return new UsernamePasswordAuthenticationToken(
                username,
                null,
                Collections.singleton((GrantedAuthority) () -> "USER") // 必须给至少一个角色
        );
    }
}

接着需要创建一个拦截器，它将设置“simpUser”标头或在 CONNECT 消息上抛出“AuthenticationException”。

@Component
public class AuthChannelInterceptorAdapter extends ChannelInterceptor {
    private static final String USERNAME_HEADER = "login";
    private static final String PASSWORD_HEADER = "passcode";
    private final WebSocketAuthenticatorService webSocketAuthenticatorService;

    @Inject
    public AuthChannelInterceptorAdapter(final WebSocketAuthenticatorService webSocketAuthenticatorService) {
        this.webSocketAuthenticatorService = webSocketAuthenticatorService;
    }

    @Override
    public Message<?> preSend(final Message<?> message, final MessageChannel channel) throws AuthenticationException {
        final StompHeaderAccessor accessor = MessageHeaderAccessor.getAccessor(message, StompHeaderAccessor.class);

        if (StompCommand.CONNECT == accessor.getCommand()) {
            final String username = accessor.getFirstNativeHeader(USERNAME_HEADER);
            final String password = accessor.getFirstNativeHeader(PASSWORD_HEADER);

            final UsernamePasswordAuthenticationToken user = webSocketAuthenticatorService.getAuthenticatedOrFail(username, password);

            accessor.setUser(user);
        }
        return message;
    }
}

请注意：preSend() 必须返回 UsernamePasswordAuthenticationToken，Spring 安全链中会对此进行测试。如果UsernamePasswordAuthenticationToken构建没有通过GrantedAuthority，则身份验证将失败，因为没有授予权限的构造函数自动设置authenticated = false 这是一个重要的细节，在 spring-security 中没有记录。

最后再创建两个类来分别处理授权和身份验证。

@Configuration
@Order(Ordered.HIGHEST_PRECEDENCE + 99)
public class WebSocketAuthenticationSecurityConfig extends  WebSocketMessageBrokerConfigurer {
    @Inject
    private AuthChannelInterceptorAdapter authChannelInterceptorAdapter;
    
    @Override
    public void registerStompEndpoints(final StompEndpointRegistry registry) {
        // 这里不用给任何东西
    }

    @Override
    public void configureClientInboundChannel(final ChannelRegistration registration) {
        registration.setInterceptors(authChannelInterceptorAdapter);
    }

}

请注意：这@Order是至关重要的，它允许我们的拦截器首先在安全链中注册。

@Configuration
public class WebSocketAuthorizationSecurityConfig extends AbstractSecurityWebSocketMessageBrokerConfigurer {
    @Override
    protected void configureInbound(final MessageSecurityMetadataSourceRegistry messages) {
        // 添加自己的映射
        messages.anyMessage().authenticated();
    }

    // 这里请自己按需求修改
    @Override
    protected boolean sameOriginDisabled() {
        return true;
    }
}

之后编写客户端进行连接，我们就可以这样指定客户端进行消息的发送。

    @MessageMapping("/greeting")
    public void greetingReturn(@Payload Object ojd){
         simpMessagingTemplate.convertAndSendToUser(username,"/topic/greeting",ojd);
    }