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spring boot 2.x解决反射性xss_反射型xss解决方法

作者：weixin_40725706 | 2024-03-29 10:30:58

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反射型xss解决方法

第一：修复建议：
1、在输入的地方进行严格的验证,例如个人信息的长度,电子邮箱的正则表达式的匹配.也就是我们俗称的白名单.
2、把用户输入任何位置的信息进行HTML编码,将用户输入所有<>和””进行替换.在应用程序中限制用户使用HTML标签跟熟悉.
3、去掉<script><a><img>等标签
4、限制输入字符
5、去掉输入中的引号
6、对输入的URL进行解码,之后进行编码

第二：编写HttpServletRequest过滤规则


import org.springframework.util.StringUtils;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.regex.Pattern;


public class XSSRequestWrapper 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 = "非法字符";
    final static int BUFFER_SIZE = 4096;
    private final String[] xssKeyWord = {"javascript", "script", "onclick", "onload", "vbscript", "html", "expression"};

    static {
        String keyStr[] = key.split("\\|");
        for (String str : keyStr) {
            notAllowedKeyWords.add(str);
        }
    }

    private String currentUrl;

    private byte[] body; //用于保存读取body中数据


    /**
     * Constructs a request object wrapping the given request.
     *
     * @param request The request to wrap
     * @throws IllegalArgumentException if the request is null
     */
    public XSSRequestWrapper(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 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) {
        boolean bool = false;
        String value = valueP;
        for (String s : xssKeyWord) {
            if (valueP.contains(s)) {
                bool = true;
                break;
            }
        }
        if (bool) {
            //包含关键字 才过滤 < > ( ) '
            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);
        value = stripXSS(value);
        return value;
    }

    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);
                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;
    }

    private String stripXSS(String value) {
        //正则过滤关键字
        if (value != null) {
            // Avoid null characters
            value = value.replaceAll("", "");
            // Avoid anything between script tags
            Pattern scriptPattern = Pattern.compile("(.*?)", Pattern.CASE_INSENSITIVE);
            value = scriptPattern.matcher(value).replaceAll("");
            // Avoid anything in a src="http://www.yihaomen.com/article/java/..." type of e­xpression
            scriptPattern = Pattern.compile("src[\r\n]*=[\r\n]*\\\'(.*?)\\\'", Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL);
            value = scriptPattern.matcher(value).replaceAll("");
            scriptPattern = Pattern.compile("src[\r\n]*=[\r\n]*\\\"(.*?)\\\"", Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL);
            value = scriptPattern.matcher(value).replaceAll("");
            // Remove any lonesome  tag
            scriptPattern = Pattern.compile("", Pattern.CASE_INSENSITIVE);
            value = scriptPattern.matcher(value).replaceAll("");
            // Remove any lonesome  tag
            scriptPattern = Pattern.compile("", Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL);
            value = scriptPattern.matcher(value).replaceAll("");
            // Avoid eval(...) e­xpressions
            scriptPattern = Pattern.compile("eval\\((.*?)\\)", Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL);
            value = scriptPattern.matcher(value).replaceAll("");
            // Avoid e­xpression(...) e­xpressions
            scriptPattern = Pattern.compile("e­xpression\\((.*?)\\)", Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL);
            value = scriptPattern.matcher(value).replaceAll("");
            // Avoid javascript:... e­xpressions
            scriptPattern = Pattern.compile("javascript:", Pattern.CASE_INSENSITIVE);
            value = scriptPattern.matcher(value).replaceAll("");
            // Avoid vbscript:... e­xpressions
            scriptPattern = Pattern.compile("vbscript:", Pattern.CASE_INSENSITIVE);
            value = scriptPattern.matcher(value).replaceAll("");
            // Avoid οnlοad= e­xpressions
            scriptPattern = Pattern.compile("onload(.*?)=", Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL);
            value = scriptPattern.matcher(value).replaceAll("");
            // Avoid οnclick=
            scriptPattern = Pattern.compile("onclick(.*?)=", Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL);
            value = scriptPattern.matcher(value).replaceAll("");
        }
        return value;
    }
}




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第三：设置xss过滤器，filter

import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import java.io.IOException;
import javax.servlet.http.HttpServletResponse;


public class XssSpringFilter implements Filter{

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

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain chain)
            throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        String requestURI = request.getRequestURI();
        //System.out.println("--------------------->过滤器：请求地址" + requestURI);
        request.setCharacterEncoding("utf-8");
        response.setContentType("text/html;charset=utf-8");
        //跨域设置
        if (response instanceof HttpServletResponse) {
            HttpServletResponse httpServletResponse = (HttpServletResponse) response;
            //通过在响应 header 中设置 ‘*’ 来允许来自所有域的跨域请求访问。
            httpServletResponse.setHeader("Access-Control-Allow-Origin", "*");
            //通过对 Credentials 参数的设置，就可以保持跨域 Ajax 时的 Cookie
            //设置了Allow-Credentials，Allow-Origin就不能为*,需要指明具体的url域
            //httpServletResponse.setHeader("Access-Control-Allow-Credentials", "true");
            //请求方式
            httpServletResponse.setHeader("Access-Control-Allow-Methods", "*");
            //（预检请求）的返回结果（即 Access-Control-Allow-Methods 和Access-Control-Allow-Headers 提供的信息） 可以被缓存多久
            httpServletResponse.setHeader("Access-Control-Max-Age", "86400");
            //首部字段用于预检请求的响应。其指明了实际请求中允许携带的首部字段
            httpServletResponse.setHeader("Access-Control-Allow-Headers", "*");
        }
        //sql,xss过滤
        if ("POST".equalsIgnoreCase(request.getMethod())) {
            XSSRequestWrapper xssRequestBodyWrapper = new XSSRequestWrapper(request);
            chain.doFilter(xssRequestBodyWrapper, response);
        } else {
            XSSRequestWrapper xssRequestWrapper = new XSSRequestWrapper(request);
            chain.doFilter(xssRequestWrapper, response);
        }

        //System.out.println("--------------------->过滤器：结束" + requestURI);
    }

    @Override
    public void destroy() {
    }

}


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第四：注册bean=“Filter”

/**
	 * 注册Filter
	 */
	@Bean
	public FilterRegistrationBean xssSpringFilter(){
		FilterRegistrationBean bean = new FilterRegistrationBean(new XssSpringFilter());
		bean.addUrlPatterns("/*");
		return bean;
	}

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第五：大功告成

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