Spring Boot防 XSS攻击 复制即用

XSS攻击通常指的是通过利用网页开发时留下的漏洞，通过巧妙的方法注入恶意指令代码到网页，使用户加载并执行攻击者恶意制造的网页程序。这些恶意网页程序通常是JavaScript，但实际上也可以包括Java、 VBScript、ActiveX、 Flash 或者甚至是普通的HTML。攻击成功后，攻击者可能得到包括但不限于更高的权限（如执行一些操作）、私密网页内容、会话和cookie等各种内容。

1、引入依赖

		<dependency>
			<groupId>org.apache.commons</groupId>
			<artifactId>commons-text</artifactId>
			<version>1.4</version>
		</dependency>

2、创建特殊字符处理Wrapper

package com.ma.core.config.filter;

import jodd.util.StringUtil;
import org.apache.commons.lang3.StringUtils;
import org.springframework.util.StreamUtils;

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.*;

/**
 * @Title: XssHttpServletRequestWrapper
 * @Package com.ma.core.config.filter
 * @Description: (XSS的特殊字符过滤处理)
 * @Author: zhangfuqiang
 * @Date: 2021/5/8 11:41
 * @Version V1.0
 */
public class XssHttpServletRequestWrapper 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<>(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 XssHttpServletRequestWrapper(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("<", "&lt;").replaceAll(">", "&gt;");
        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;
    }
}

3、创建过滤器

package com.ma.core.config.filter;

import lombok.extern.log4j.Log4j2;
import org.springframework.stereotype.Component;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import java.io.IOException;

/**
 * @Title: XssFilter3
 * @Package com.ma.core.config.filter
 * @Description: (用一句话描述该文件做什么)
 * @Author: zhangfuqiang
 * @Date: 2021/5/8 14:11
 * @Version V1.0
 */
@Log4j2
@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
        //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;
            }
        }
        //将请求放入XSS请求包装器中，返回过滤后的值
        XssHttpServletRequestWrapper xssRequestWrapper3 = new XssHttpServletRequestWrapper(req);
        filterChain.doFilter(xssRequestWrapper3, servletResponse);
    }

    @Override
    public void destroy() {

    }
}