xss跨站脚本攻击如何修复

xss跨站脚本攻击的解决方案：

建立一个httpservletRequestWapper的包装类，对用户发送的请求进行包装，把request中包含XSS代码进行过滤，代码如下：

import java.util.Map;
import javax.servlet.Http.HttpServletRequest;  
import javax.servlet.http.HttpServletRequestWrapper;  
public class XsshttpServletRequestWrapper extends HttpServletRequestWrapper {  
    HttpServletRequest orgRequest = null;  
    public XssHttpServletRequestWrapper(HttpServletRequest request) {  
        super(request);
    }  
      
    @Override  
    public String getParameter(String name) {  
        String value = super.getParameter(xssEncode(name));  
        if (value != null) {  
            value = xssEncode(value);  
        }  
        return value;  
    }
    @Override
    public String[] getParameterValues(String name) {
        String[] value = super.getParameterValues(name);
        if(value != null){
            for (int i = 0; i < value.length; i++) {
                value[i] = xssEncode(value[i]);
            }
        }
        return value;
    }
    @Override
    public Map getParameterMap() {
        // TODO Auto-generated method stub
        return super.getParameterMap();
    }
    
      
    private static String xssEncode(String value) {  
         if (value == null || value.isEmpty()) {  
            return value;  
        }  
        value = value.replaceAll("eval\\((.*)\\)", "");
        value = value.replaceAll("[\\\"\\\'][\\s]*javascript:(.*)[\\\"\\\']", "\"\"");
        value = value.replaceAll("(?i)<script.*?>.*?<script.*?>", "");
        value = value.replaceAll("(?i)<script.*?>.*?</script.*?>", "");
        value = value.replaceAll("(?i)<.*?javascript:.*?>.*?</.*?>", "");
        value = value.replaceAll("(?i)<.*?\\s+on.*?>.*?</.*?>", "");
        return value;
    }  
}

使用Filter过滤器实现对Request的过滤，代码如下：

import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import com.lyms.wxyl.base.wrapper.XssHttpServletRequestWrapper;
public class XssFilter implements Filter {
    public void destroy() {
        // TODO Auto-generated method stub
    }
    
    public void doFilter(ServletRequest request, ServletResponse response,FilterChain chain) throws IOException, ServletException {
        //包装request
        XssHttpServletRequestWrapper xssRequest = new XssHttpServletRequestWrapper((HttpServletRequest) request);
        chain.doFilter(xssRequest, response);
    }
    public void init(FilterConfig filterConfig) throws ServletException {
        // TODO Auto-generated method stub
    }
}

在WEB.xml中定义好Filter，例如：

<filter>
        <filter-name>XssFilter</filter-name>
        <filter-class>包名.XssFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>XssFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

Filter类需要引入javax.servlet.api的jar包，因此要在pom.xml配置jar包，代码：

<dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>servlet-api</artifactId>
            <version>${servlet.version}</version>
            <scope>provided</scope>
         </dependency>
         <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jsp-api</artifactId>
            <version>2.0</version>
            <scope>provided</scope>
         </dependency>
         <properties>
           <servlet.version>3.0-alpha-1</servlet.version>
         </properties>