xss跨站脚本攻击如何修复

xss跨站脚本攻击的解决方案：

1.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);    }      /**      * 覆盖getParameter方法，将参数名和参数值都做xss过滤。     * 如果需要获得原始的值，则通过super.getParameterValues(name)来获取     * getParameterNames,getParameterValues和getParameterMap也可能需要覆盖      */      @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();    }    /**      * 覆盖getHeader方法，将参数名和参数值都做xss过滤。     * 如果需要获得原始的值，则通过super.getHeaders(name)来获取      * getHeaderNames 也可能需要覆盖     * 这一段代码在一开始没有注释掉导致出现406错误，原因是406错误是HTTP协议状态码的一种，     * 表示无法使用请求的内容特性来响应请求的网页。一般是指客户端浏览器不接受所请求页面的 MIME 类型。      *      @Override      public String getHeader(String name) {          String value = super.getHeader(xssEncode(name));          if (value != null) {              value = xssEncode(value);          }          return value;      }      **/    /**      * 将容易引起xss漏洞的半角字符直接替换成全角字符 在保证不删除数据的情况下保存     * @param s      * @return 过滤后的值     */      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;    }  }

2.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    }    /**     * 过滤器用来过滤的方法     */    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    }}

3.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>

4.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>