SSM传统框架使用Filter方式解决Xss攻击，支持指定请求、指定参数进行处理

素颜马尾好姑娘i 2023-06-16 07:54 3阅读 0赞

创建拦截器

>     import javax.servlet.*;
>     import javax.servlet.http.HttpServletRequest;
>     import java.io.IOException;
>     import java.util.ArrayList;
>     import java.util.List;
>     
>     
>     public class XssFilter implements Filter {
>     
>         List<String> prefixIignores = new ArrayList<>();
>     
>         @Override
>         public void init(FilterConfig filterConfig) throws ServletException {
>             System.out.println("xss过滤器的初始化操作");
>     //对应web.xml中init-param标签体内容，放行的请求
>             String ignoresParam = filterConfig.getInitParameter("ignores");
>             String[] ignoreArray = ignoresParam.split(",");
>             for (String s : ignoreArray) {
>                 prefixIignores.add(s.trim());
>             }
>         }
>         @Override
>         public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
>                 throws IOException, ServletException {
>     
>             HttpServletRequest req = (HttpServletRequest) request;
>     
>             if (canIgnore(req)){
>                 chain.doFilter(request,response);
>             }else {
>                 XssWarper xssWarper = new XssWarper(req);
>                 //放行
>                 chain.doFilter(xssWarper, response);
>              
>             }
>     
>     }
>         @Override
>         public void destroy() {
>             System.out.println("xss过滤器的销毁");
>         }
>     
>     
>     
>         private boolean canIgnore(HttpServletRequest request) {
>             String url = request.getRequestURI();
>             for (String ignore : prefixIignores) {
>                 if (url.endsWith(ignore)) {
>                     return true;
>                 }
>             }
>             return false;
>         }
>     }

创建XssWarper

>  
> 
>     import cn.jiguang.common.utils.StringUtils;
>     import org.springframework.web.util.HtmlUtils;
>     
>     import javax.servlet.ServletInputStream;
>     import javax.servlet.http.HttpServletRequest;
>     import javax.servlet.http.HttpServletRequestWrapper;
>     import java.io.IOException;
>     import java.util.HashMap;
>     import java.util.Map;
>     
>     
>     public class XssWarper  extends HttpServletRequestWrapper {
>         private Map<String , String[]> params = new HashMap<String, String[]>(); // 用于存储请求参数
>         private ServletInputStream servletInputStream = null;
>     
>         /**
>          * @Method content 富文本内容
>          * @Author MC
>          不进行处理的params
>          * @Return
>          * @Date 2019/11/25 0025 9:55
>          */
>         private String noCheckParamsStr = "content";
>     
>         private HttpServletRequest request;
>     
>         public XssWarper(HttpServletRequest request) {
>             super(request);
>             this.request = request;
>             this.params.putAll(request.getParameterMap());
>         }
>     
>         /**
>          * 重载一个构造方法
>          * @param request
>          * @param extendParams
>          */
>         public XssWarper(HttpServletRequest request , Map<String , String[]> extendParams) throws IOException {
>             this(request);
>             for (String key: extendParams.keySet()) {
>                 String val = this.getParameter(key);
>                 if (StringUtils.isNotEmpty(val)){
>                     extendParams.put(key,new String[]{val});
>                 }
>             }
>             addAllParameters(extendParams);
>         }
>     
>         @Override
>         public String getParameter(String name) {
>             if(noCheckParamsStr.indexOf(name) != -1){
>                 return super.getParameter(name);
>             }
>             String val = request.getParameter(name);
>             if(StringUtils.isNotEmpty(val)){
>                 val = HtmlUtils.htmlEscape(val); // 将所有传递进来的String进行HTML编码，防止XSS攻击
>             }
>             return val;
>         }
>     
>         @Override
>         public String[] getParameterValues(String name) {
>             return params.get(name);
>         }
>     
>     
>         public void addAllParameters(Map<String , String[]> otherParams) {
>             for(Map.Entry<String , String[]>entry : otherParams.entrySet()) {
>                 addParameter(entry.getKey() , entry.getValue());
>             }
>         }
>     
>         public void addParameter(String name , Object value) {
>             if(value != null) {
>                 if(value instanceof String[]) {
>                     params.put(name , (String[])value);
>                 }else if(value instanceof String) {
>                     params.put(name , new String[] {(String)value});
>                 }else {
>                     params.put(name , new String[] {String.valueOf(value)});
>                 }
>             }
>         }
>     }

web.xml中注册过滤器，请注意与其他过滤器的先后顺序

>  
> 
>     <filter>
>       <filter-name>xssFilter</filter-name>
>       <filter-class>com.jeeplus.common.filter.XssFilter</filter-class>
>         <init-param>
>             <param-name>ignores</param-name>
>             <param-value>
>               /core/sysAppVersion/uploader,
>               /app/fileUpload/upload
>             </param-value>
>         </init-param>
>     </filter>
>     <filter-mapping>
>       <filter-name>xssFilter</filter-name>
>       <url-pattern>/*</url-pattern>
>     </filter-mapping>