标签：复制 链接 iba 删除 bytes private div jpg 关键字
什么是XSS?
百度百科的解释: XSS又叫CSS (Cross Site Script) ，跨站脚本攻击。它指的是恶意攻击者往Web页面里插入恶意html代码，当用户浏览该页之时，嵌入其中Web里面的html代码会被执行，从而达到恶意用户的特殊目的。
它与SQL注入攻击类似，SQL注入攻击中以SQL语句作为用户输入，从而达到查询/修改/删除数据的目的，而在xss攻击中，通过插入恶意脚本，实现对用户游览器的控制，获取用户的一些信息。
xss攻击可以分成两种类型：
1.非持久型攻击
2.持久型攻击
非持久型xss攻击：顾名思义，非持久型xss攻击是一次性的，仅对当次的页面访问产生影响。非持久型xss攻击要求用户访问一个被攻击者篡改后的链接，用户访问该链接时，被植入的攻击脚本被用户游览器执行，从而达到攻击目的。
持久型xss攻击：持久型xss，会把攻击者的数据存储在服务器端，攻击行为将伴随着攻击数据一直存在。
也可以分成三类:
反射型：经过后端，不经过数据库
存储型：经过后端，经过数据库
先加pom文件加上依赖
1 <dependency> 2 <groupId>org.apache.commons</groupId> 3 <artifactId>commons-text</artifactId> 4 <version>1.4</version> 5 </dependency>
1.首先是要写个过滤器的包装类，这也是实现XSS攻击过滤的核心代码。
这边因为业务需要，我拆分了两种的xss包装类，针对于不同的接口来使用。
第一中写法如下：
package com.hrt.zxxc.fxspg.xss;
import com.alibaba.fastjson.JSON;
import org.apache.commons.lang3.StringUtils;
import org.apache.commons.text.StringEscapeUtils;
import javax.servlet.ReadListener;
import javax.servlet.ServletInputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import java.io.*;
import java.nio.charset.Charset;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
/**
* @program: fxspg
* @description: XSS过滤具体核心代码（第一种）
* @author: liumingyu
* @date: 2020-01-10 14:28
**/
public class XssAndSqlHttpServletRequestWrapper extends HttpServletRequestWrapper {
//声明sql注入的关键词key
private static String key = "and|exec|insert|select|delete|update|count|*|%|chr|mid|master|truncate|char|declare|;|or|-|+";
private static Set<String> notAllowedKeyWords = new HashSet<String>(0);
private static String replacedString="INVALID";
static {
String keyStr[] = key.split("\\|");
//将key添加到Set集合中
for (String str : keyStr) {
notAllowedKeyWords.add(str);
}
}
/**
* @return
* @Author liumingyu
* @Description //TODO 构造函数，传入参数，执行超类
* @Date 2020/1/10 2:29 下午
* @Param [request]
**/
public XssAndSqlHttpServletRequestWrapper(HttpServletRequest request) {
super(request);
}
/**
* @return java.lang.String
* @Author liumingyu
* @Description //TODO 重写getParameter方法 ,getParameter方法是直接通过request获得querystring类型的入参调用的方法
* @Date 2020/1/10 2:31 下午
* @Param [name]
**/
@Override
public String getParameter(String name) {
String value = super.getParameter(name);
if (!StringUtils.isEmpty(value)) {
//调用Apache的工具类：StringEscapeUtils.escapeHtml4
value = StringEscapeUtils.escapeHtml4(value);
value = cleanSqlKeyWords(value);
}
return value;
}
/**
* @return java.lang.String[]
* @Author liumingyu
* @Description //TODO 重写getParameterValues
* @Date 2020/1/10 2:32 下午
* @Param [name]
**/
@Override
public String[] getParameterValues(String name) {
String[] parameterValues = super.getParameterValues(name);
if (parameterValues == null) {
return null;
}
for (int i = 0; i < parameterValues.length; i++) {
String value = parameterValues[i];
//调用Apache的工具类：StringEscapeUtils.escapeHtml4
parameterValues[i] = StringEscapeUtils.escapeHtml4(value);
parameterValues[i] = cleanSqlKeyWords(parameterValues[i]);
}
return parameterValues;
}
@Override
public String getHeader(String name) {
//过滤xss攻击
String value = StringEscapeUtils.escapeHtml4(super.getHeader(name));
if (value == null){
return null;
}
//过滤sql注入
return cleanSqlKeyWords(value);
}
@Override
public String getQueryString() {
return StringEscapeUtils.escapeHtml4(super.getQueryString());
}
/**
* @return javax.servlet.ServletInputStream
* @Author liumingyu
* @Description //TODO 过滤JSON数据中的XSS攻击
* @Date 2020/1/10 4:58 下午
* @Param []
**/
@Override
public ServletInputStream getInputStream() throws IOException {
//调用方法将流数据return为String
String str = getRequestBody(super.getInputStream());
//如果str为""，则返回0
if ("".equals(str)) {
return new ServletInputStream() {
@Override
public int read() throws IOException {
return 0;
}
@Override
public boolean isFinished() {
return false;
}
@Override
public boolean isReady() {
return false;
}
@Override
public void setReadListener(ReadListener readListener) {
}
};
}
//将数据存放至map
Map<String, Object> map = JSON.parseObject(str, Map.class);
//声明个存放过滤后数据的hashMap
Map<String, Object> resultMap = new HashMap<>(map.size());
//开始遍历数据
for (String key : map.keySet()) {
Object val = map.get(key);
//如果key=富文本字段名，就不去过滤
if ("content".equals(key)) {
//不过滤
resultMap.put(key, val);
} else {
//不为富文本字段才会过滤
if (map.get(key) instanceof String) {
//通过escapeHtml4去过滤
resultMap.put(key, StringEscapeUtils.escapeHtml4(cleanSqlKeyWords(val.toString())));
} else {
//不过滤
resultMap.put(key, val);
}
}
}
str = JSON.toJSONString(resultMap);
final ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(str.getBytes());
return new ServletInputStream() {
@Override
public int read() throws IOException {
return byteArrayInputStream.read();
}
@Override
public boolean isFinished() {
return false;
}
@Override
public boolean isReady() {
return false;
}
@Override
public void setReadListener(ReadListener readListener) {
}
};
}
/**
* @return java.lang.String
* @Author liumingyu
* @Description //TODO 获取JSON数据
* @Date 2020/1/10 4:58 下午
* @Param [stream]
**/
private String getRequestBody(InputStream stream) {
String line = "";
StringBuilder body = new StringBuilder();
int counter = 0;
// 读取POST提交的数据内容
BufferedReader reader = new BufferedReader(new InputStreamReader(stream, Charset.forName("UTF-8")));
try {
while ((line = reader.readLine()) != null) {
//拼接读取到的数据
body.append(line);
counter++;
}
} catch (IOException e) {
e.printStackTrace();
}
if (body == null) {
return "";
}
//最后返回数据
return body.toString();
}
/**
* @Author liumingyu
* @Description //TODO 过滤可能造成sql注入的关键字
* @Date 2020/1/13 9:11 上午
* @Param [value]
* @return java.lang.String
**/
private String cleanSqlKeyWords(String value) {
String paramValue = value;
for (String keyword : notAllowedKeyWords) {
if (paramValue.length() > keyword.length() + 4
&& (paramValue.contains(" "+keyword)||paramValue.contains(keyword+" ")||paramValue.contains(" "+keyword+" "))) {
paramValue = StringUtils.replace(paramValue, keyword, replacedString);
}
}
return paramValue;
}
}
第二种如下：
package com.hrt.zxxc.fxspg.xss;
import org.springframework.util.StreamUtils;
import org.springframework.util.StringUtils;
import javax.servlet.ReadListener;
import javax.servlet.ServletInputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
/**
* @ClassName XssHttpServletRequestWrapper3
* @Description TODO xss过滤核心代码（第二种）
* @Author liumingyu
* @Date 2020/2/4 15:51
* @Version 1.0
**/
public class XssHttpServletRequestWrapper3 extends HttpServletRequestWrapper {
private static String key = "and|exec|insert|select|delete|update|count|*|%|chr|mid|master|truncate|char|declare|;|or|-|+";
private static Set<String> notAllowedKeyWords = new HashSet<String>(0);
private static String replacedString="INVALID";
static {
String keyStr[] = key.split("\\|");
for (String str : keyStr) {
notAllowedKeyWords.add(str);
}
}
private String currentUrl;
private byte[] body;
/**
* @Author liumingyu
* @Description //TODO 构造函数
* @Date 2020/2/5 19:58
* @Param [servletRequest]
* @return
**/
public XssHttpServletRequestWrapper3(HttpServletRequest servletRequest) throws IOException {
super(servletRequest);
currentUrl = servletRequest.getRequestURI();
//获取到json数据
this.body = StreamUtils.copyToByteArray(servletRequest.getInputStream());
}
/**
* @Author liumingyu
* @Description //TODO 重写该方法过滤json数据
* @Date 2020/2/5 19:59
* @Param []
* @return javax.servlet.ServletInputStream
**/
@Override
public ServletInputStream getInputStream() throws IOException {
ServletInputStream inputStream = null;
String bodyStr = new String(body);
if (!StringUtils.isEmpty(bodyStr)) {
bodyStr = xssEncode(bodyStr, 1);
bodyStr = cleanSqlKeyWords(bodyStr);
final ByteArrayInputStream bais = new ByteArrayInputStream(bodyStr.getBytes());
return new ServletInputStream() {
@Override
public boolean isFinished() {
return false;
}
@Override
public boolean isReady() {
return false;
}
@Override
public void setReadListener(ReadListener readListener) {
}
@Override
public int read() throws IOException {
return bais.read();
}
};
}
return inputStream;
}
/**
* @Author liumingyu
* @Description //TODO 将容易引起xss漏洞的半角字符直接替换成全角字符
* @Date 2020/2/5 19:57
* @Param [s, type]
* @return java.lang.String
**/
private static String xssEncode(String s, int type) {
if (s == null || s.isEmpty()) {
return s;
}
StringBuilder sb = new StringBuilder(s.length() + 16);
for (int i = 0; i < s.length(); i++) {
char c = s.charAt(i);
if (type == 0) {
switch (c) {
case ‘\‘‘:
// 全角单引号
sb.append(‘‘‘);
break;
case ‘\"‘:
// 全角双引号
sb.append(‘“‘);
break;
case ‘>‘:
// 全角大于号
sb.append(‘＞‘);
break;
case ‘<‘:
// 全角小于号
sb.append(‘＜‘);
break;
case ‘&‘:
// 全角&符号
sb.append(‘＆‘);
break;
case ‘\\‘:
// 全角斜线
sb.append(‘＼‘);
break;
case ‘#‘:
// 全角井号
sb.append(‘＃‘);
break;
// < 字符的 URL 编码形式表示的 ASCII 字符（十六进制格式） 是: %3c
case ‘%‘:
processUrlEncoder(sb, s, i);
break;
default:
sb.append(c);
break;
}
} else {
switch (c) {
case ‘>‘:
// 全角大于号
sb.append(‘＞‘);
break;
case ‘<‘:
// 全角小于号
sb.append(‘＜‘);
break;
case ‘&‘:
// 全角&符号
sb.append(‘＆‘);
break;
case ‘#‘:
// 全角井号
sb.append(‘＃‘);
break;
// < 字符的 URL 编码形式表示的 ASCII 字符（十六进制格式） 是: %3c
case ‘%‘:
processUrlEncoder(sb, s, i);
break;
default:
sb.append(c);
break;
}
}
}
return sb.toString();
}
public static void processUrlEncoder(StringBuilder sb, String s, int index) {
if (s.length() >= index + 2) {
// %3c, %3C
if (s.charAt(index + 1) == ‘3‘ && (s.charAt(index + 2) == ‘c‘ || s.charAt(index + 2) == ‘C‘)) {
sb.append(‘＜‘);
return;
}
// %3c (0x3c=60)
if (s.charAt(index + 1) == ‘6‘ && s.charAt(index + 2) == ‘0‘) {
sb.append(‘＜‘);
return;
}
// %3e, %3E
if (s.charAt(index + 1) == ‘3‘ && (s.charAt(index + 2) == ‘e‘ || s.charAt(index + 2) == ‘E‘)) {
sb.append(‘＞‘);
return;
}
// %3e (0x3e=62)
if (s.charAt(index + 1) == ‘6‘ && s.charAt(index + 2) == ‘2‘) {
sb.append(‘＞‘);
return;
}
}
sb.append(s.charAt(index));
}
/**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 parameter) {
String value = super.getParameter(parameter);
if (value == null) {
return null;
}
return cleanXSS(value);
}
@Override
public String[] getParameterValues(String parameter) {
String[] values = super.getParameterValues(parameter);
if (values == null) {
return null;
}
int count = values.length;
String[] encodedValues = new String[count];
for (int i = 0; i < count; i++) {
encodedValues[i] = cleanXSS(values[i]);
}
return encodedValues;
}
@Override
public Map<String, String[]> getParameterMap(){
Map<String, String[]> values=super.getParameterMap();
if (values == null) {
return null;
}
Map<String, String[]> result=new HashMap<>();
for(String key:values.keySet()){
String encodedKey=cleanXSS(key);
int count=values.get(key).length;
String[] encodedValues = new String[count];
for (int i = 0; i < count; i++){
encodedValues[i]=cleanXSS(values.get(key)[i]);
}
result.put(encodedKey,encodedValues);
}
return result;
}
/**
* 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
*/
@Override
public String getHeader(String name) {
String value = super.getHeader(name);
if (value == null) {
return null;
}
return cleanXSS(value);
}
private String cleanXSS(String valueP) {
String value = valueP.replaceAll("<", "<").replaceAll(">", ">");
value = value.replaceAll("<", "& lt;").replaceAll(">", "& gt;");
value = value.replaceAll("\\(", "& #40;").replaceAll("\\)", "& #41;");
value = value.replaceAll("‘", "& #39;");
value = value.replaceAll("eval\\((.*)\\)", "");
value = value.replaceAll("[\\\"\\\‘][\\s]*javascript:(.*)[\\\"\\\‘]", "\"\"");
value = value.replaceAll("script", "");
value = cleanSqlKeyWords(value);
return value;
}
private String cleanSqlKeyWords(String value) {
String paramValue = value;
for (String keyword : notAllowedKeyWords) {
if (paramValue.length() > keyword.length() + 3
&& (paramValue.contains(" "+keyword)||paramValue.contains(keyword+" ")||paramValue.contains(" "+keyword+" "))) {
paramValue = StringUtils.replace(paramValue, keyword, replacedString);
System.out.println(this.currentUrl + "已被过滤，因为参数中包含不允许sql的关键词(" + keyword
+ ")"+";参数："+value+";过滤后的参数："+paramValue);
}
}
return paramValue;
}
package com.hrt.zxxc.fxspg.xss;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.module.SimpleModule;
import org.springframework.context.annotation.Bean;
import org.springframework.http.converter.json.Jackson2ObjectMapperBuilder;
import org.springframework.stereotype.Component;
import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
/**
* @ClassName XssFilter2
* @Description TODO
* @Author liumingyu
* @Date 2020/2/4 15:45
* @Version 1.0
**/
@WebFilter
@Component
public class XssFilter3 implements Filter {
@Override
public void init(FilterConfig filterConfig) throws ServletException {
}
@Override
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse,
FilterChain filterChain) throws IOException, ServletException {
//获取请求数据
HttpServletRequest req = (HttpServletRequest) servletRequest;
//获取请求的url路径
String path = ((HttpServletRequest) servletRequest).getServletPath();
//声明要被忽略请求的数组
String[] exclusionsUrls = {".js", ".gif", ".jpg", ".jpeg", ".png", ".css", ".ico", "health", "uploadPic", "file", "savePrintTemp", "goods/create", "goods/edit", "goodsBatchImport", "goodsBatchExport","platformtestreport"};
//声明带有富文本的接口数组
String[] richTextUrls = {"addarticles", "editarticles", "advert"};
//第一种xss过滤
XssAndSqlHttpServletRequestWrapper XssAndSqlHttpServletRequestWrapper = new XssAndSqlHttpServletRequestWrapper(req);
//遍历忽略的请求数组，若该接口url为忽略的就调用原本的过滤器，不走xss过滤
for (String str : exclusionsUrls) {
if (path.contains(str)) {
filterChain.doFilter(servletRequest, servletResponse);
return;
}
}
//若为带有富文本的接口，走第一种xss过滤
for (String rtu : richTextUrls) {
if (path.contains(rtu)) {
filterChain.doFilter(XssAndSqlHttpServletRequestWrapper, servletResponse);
return;
}
}
//将请求放入XSS请求包装器中，返回过滤后的值
XssHttpServletRequestWrapper3 xssRequestWrapper3 = new XssHttpServletRequestWrapper3(req);
filterChain.doFilter(xssRequestWrapper3, servletResponse);
}
@Override
public void destroy() {
}
}
标签：复制 链接 iba 删除 bytes private div jpg 关键字
原文地址：https://www.cnblogs.com/it-deepinmind/p/13073090.html
