捕获并阻止请求可疑 URL 的 IP 的示例 Servlet 过滤器 [英] Example Servlet Filter that catches and blocks IP's that request suspicious URL's

问题描述

为了避免重新开发轮子.是否有处理一些基本安全检查的 Java EE servlet 过滤器示例/即

To avoid re-developing the wheel. Are there any example Java EE servlet filters that take care of some basic security checks/ i.e.

• 如果 Rootkit 访问服务器，即使用以 .exe 结尾或包含../../.."的 URL，则在一段时间内阻止 Web 请求
• 限制或阻止发出意外大量请求的 IP.

我还想知道，对于那些特定类型的请求，servlet 过滤器中与 Thread.sleep(1000); 等效的东西是否不会是件坏事.

I also wonder if something equivalent to a Thread.sleep(1000); in the servlet filter for those particular types of requests wouldn't be such a bad thing.

推荐答案

也许这会有所帮助.

public class SuspiciousURLFilter implements Filter {

        @Override
        public void destroy() {
        }

        @Override
        public void doFilter(ServletRequest request, ServletResponse response,
                FilterChain filterChain) throws IOException, ServletException {

            HttpServletRequest httpRequest = (HttpServletRequest) request;
            String requestURI = httpRequest.getRequestURI();

            if (requestURI.endsWith(".exe")) {

                HttpServletResponse httpResponse = (HttpServletResponse) response;
                            //send error or maybe redirect to some error page
                            httpResponse.sendError(HttpServletResponse.SC_BAD_REQUEST);
            }

            filterChain.doFilter(request, response);
        }

        @Override
        public void init(FilterConfig config) throws ServletException {
        }
    }

在您的 web.xml 中:

In your web.xml:

    <filter>
        <filter-name>suspiciousURLFilter </filter-name>
        <filter-class>your.package.SuspiciousURLFilter</filter-class>
    </filter>

    <filter-mapping>
        <filter-name>SuspiciousURLFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

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