详解java解决XSS攻击常用方法总结

<video src=1 onerror=alert(/xss/)/>

<script>alert("@@") </script>

public class XssStrUtils {

    
    public static String replaceHtmlCode(String content) {
        if (null == content) return null;
        if (0 == content.length()) return "";
        // 需要滤除的脚本事件关键字
        String[] evenTKEyWords = {
                "onmouseover", "onmouseout", "onmousedown", "onmouseup", "onmousemove", "onclick", "ondblclick",
                "onkeypress", "onkeydown", "onkeyup", "ondragstart", "onerrorupdate", "onhelp", "onreadystatechange",
                "onrowenter", "onrowexit", "onselectstart", "onload", "onunload", "onbeforeunload", "onblur",
                "onerror", "onfocus", "onresize", "onscroll", "oncontextmenu", "alert"
        };
        content = replace(content, "<script", "<script", false);
        content = replace(content, "</script", "</script", false);
        content = replace(content, "<marquee", "<marquee", false);
        content = replace(content, "</marquee", "</marquee", false);
        content = replace(content, "'", "_", false);// 将单引号替换成下划线
        content = replace(content, "\"", "_", false);// 将双引号替换成下划线
        // 滤除脚本事件代码
        for (int i = 0; i < eventKeywords.length; i++) {
            content = replace(content, eventKeywords[i], "_" + eventKeywords[i], false); // 添加一个"_", 使事件代码无效
        }
        return content;
    }

    
    private static String replace(String source, String oldStr, String newStr) {
        return replace(source, oldStr, newStr, true);
    }

    
    private static String replace(String source, String oldStr, String newStr,boolean matchCase) {
        if (source == null) return null;
        // 首先检查旧字符串是否存在, 不存在就不进行替换
        if (source.toLowerCase().indexOf(oldStr.toLowerCase()) == -1) return source;
        int findStartPos = 0;
        int a = 0;
        while (a > -1) {
            int b = 0;
            String str1, str2, str3, str4, strA, strB;
            str1 = source;
            str2 = str1.toLowerCase();
            str3 = oldStr;
            str4 = str3.toLowerCase();
            if (matchCase) {
                strA = str1;
                strB = str3;
            } else {
                strA = str2;
                strB = str4;
            }
            a = strA.indexOf(strB, findStartPos);
            if (a > -1) {
                b = oldStr.length();
                findStartPos = a + b;
                StringBuffer bbuf = new StringBuffer(source);
                source = bbuf.replace(a, a + b, newStr) + "";
                // 新的查找开始点位于替换后的字符串的结尾
                findStartPos = findStartPos + newStr.length() - b;
            }
        }
        return source;
    }

}

	@PostMapping("/getAccName")
    public String getAccName(@RequestBody NameParams params){
        String s = XssStrUtils.replaceHtmlCode(params.getName());
        return s;
    }

		<dependency>
            <groupId>cn.hutool</groupId>
            <artifactId>hutool-all</artifactId>
            <version>5.5.9</version>
        </dependency>

public class XssHttpRequestWrapper extends httpservletRequestWrapper {

    public XsshttpRequestWrapper(HttpServletRequest request) {
        super(request);
    }

    @Override
    public String getParameter(String name) {
        String value = super.getParameter(name);
        if(!StringUtils.isEmpty(value)){
            value = HtmlUtil.filter(value);
        }
        return value;
    }

    @Override
    public String[] getParameterValues(String name) {
        String[] values = super.getParameterValues(name);
        if(values!=null){
            for(int i=0;i<values.length;i++){
                String value = values[i];
                if(!StringUtils.isEmpty(value)){
                    value = HtmlUtil.filter(value);
                }
                values[i]=value;
            }
        }
        return values;
    }

    @Override
    public Map<String, String[]> getParameterMap() {
        Map<String, String[]> parameters = super.getParameterMap();
        Map<String, String[]> map = new LinkedHashMap<>();
        if(parameters !=null){
            for(String key : parameters.keySet()){
                String[] values = parameters.get(key);
                for(int i=0;i<values.length;i++){
                    String value = values[i];
                    if(!StringUtils.isEmpty(value)){
                        value = HtmlUtil.filter(value);
                    }
                    values[i]=value;
                }
                map.put(key,values);
            }
        }
        return map;
    }

    @Override
    public String getHeader(String name) {
        String value = super.getHeader(name);
        if(!StringUtils.isEmpty(value)){
            value = HtmlUtil.filter(value);
        }
        return value;
    }

    @Override
    public ServletInputStream getInputStream() throws IOException {
        InputStream in = super.getInputStream();
        InputStreamReader reader = new InputStreamReader(in, Charset.forName("UTF-8"));
        BufferedReader buffer = new BufferedReader(reader);
        StringBuffer body = new StringBuffer();
        String line = buffer.readLine();
        while (line !=null){
            body.append(line);
            line = buffer.readLine();
        }
        buffer.close();
        reader.close();
        in.close();
        Map<String,Object> map = JSONUtil.parseObj(body.toString());
        Map<String,Object> result = new LinkedHashMap<>();
        for(String key : map.keySet()){
            Object val = map.get(key);
            if(val instanceof String){
                if(!StringUtils.isEmpty(val.toString())){
                    result.put(key,HtmlUtil.filter(val.toString()));
                }
            }else {
                result.put(key,val);
            }
        }

        String json = JSONUtil.toJsonStr(result);
        ByteArrayInputStream bain = new ByteArrayInputStream(json.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 bain.read();
            }
        };
    }
}

public class XssFilter implements Filter {

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {

    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest)servletRequest;
        XssHttpRequestWrapper requestWrapper = new XssHttpRequestWrapper(request);
        filterChain.doFilter(requestWrapper,servletResponse);
    }

    @Override
    public void destroy() {

    }
}

@Configuration
public class XSSFilterReGISter {

    @Bean
    public FilterRegistrationBean<XssFilter> RegistTest1(){
        //通过FilterRegistrationBean实例设置优先级可以生效
        FilterRegistrationBean<XssFilter> bean = new FilterRegistrationBean<XssFilter>();
        bean.setFilter(new XssFilter());//注册自定义过滤器
        bean.setName("flilter");//过滤器名称
        bean.addUrlPatterns("/*");//过滤所有路径
        return bean;
    }

}

	@PostMapping("/getAccName")
    public String getAccName(@RequestBody NameParams params){
        return "name is : "+ params.getName();
    }