XSS攻击漏洞修复 java

偏执的太偏执、 2022-04-03 06:47 375阅读 0赞

<filter-name>XssSqlFilter</filter-name>
        <filter-class>com.hzlh.filter.XssFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>XssSqlFilter</filter-name>
        <url-pattern>/*</url-pattern>
        <dispatcher>REQUEST</dispatcher>
        <dispatcher>FORWARD</dispatcher>
    </filter-mapping>

package com.hzlh.filter;
    
    import java.util.regex.Pattern;
    
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletRequestWrapper;
    
    public class XssHttpServletRequestWrapper extends HttpServletRequestWrapper {
    
        public XssHttpServletRequestWrapper(HttpServletRequest request) {
            super(request);
        }
    
        /**
         * 对数组参数进行特殊字符过滤
         */
        @Override
        public String[] getParameterValues(String name) {
            String[] values = super.getParameterValues(name);
            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;
        }
    
        /**
         * 对参数中特殊字符进行过滤
         */
        @Override
        public String getParameter(String name) {
            String value = super.getParameter(name);
            if (value == null) {
                return null;
            }
            return cleanXSS(value);
        }
    
        /**
         * 获取attribute,特殊字符过滤
         */
        @Override
        public Object getAttribute(String name) {
            Object value = super.getAttribute(name);
            if (value != null && value instanceof String) {
                cleanXSS((String) value);
            }
            return value;
        }
    
        /**
         * 对请求头部进行特殊字符过滤
         */
        @Override
        public String getHeader(String name) {
            String value = super.getHeader(name);
            if (value == null) {
                return null;
            }
            return cleanXSS(value);
        }
    
        /**
         * 转义字符,使用该方法存在一定的弊端
         * 
         * @param value
         * @return
         */
        private String cleanXSS2(String value) {
            // 移除特殊标签
            value = value.replaceAll("<", "<").replaceAll(">", ">");
            value = value.replaceAll("\\(", "(").replaceAll("\\)", ")");
            value = value.replaceAll("'", "'");
            value = value.replaceAll("eval\\((.*)\\)", "");
            value = value.replaceAll("[\\\"\\\'][\\s]*javascript:(.*)[\\\"\\\']", "\"\"");
            value = value.replaceAll("script", "");
            return value;
        }
    
        private String cleanXSS(String value) {
            if (value != null) {
                //推荐使用ESAPI库来避免脚本攻击,value = ESAPI.encoder().canonicalize(value);
                // 避免空字符串
                value = value.replaceAll(" ", "");
                // 避免script 标签
                Pattern scriptPattern = Pattern.compile("<script>(.*?)</script>", Pattern.CASE_INSENSITIVE);
                value = scriptPattern.matcher(value).replaceAll("");
                // 避免src形式的表达式
                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("");
                // 删除单个的 </script> 标签
                scriptPattern = Pattern.compile("</script>", Pattern.CASE_INSENSITIVE);
                value = scriptPattern.matcher(value).replaceAll("");
                // 删除单个的<script ...> 标签
                scriptPattern = Pattern.compile("<script(.*?)>",
                        Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL);
                value = scriptPattern.matcher(value).replaceAll("");
                // 避免 eval(...) 形式表达式
                scriptPattern = Pattern.compile("eval\\((.*?)\\)",
                        Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL);
                value = scriptPattern.matcher(value).replaceAll("");
                // 避免 expression(...) 表达式
                scriptPattern = Pattern.compile("expression\\((.*?)\\)",
                        Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL);
                value = scriptPattern.matcher(value).replaceAll("");
                // 避免 javascript: 表达式
                scriptPattern = Pattern.compile("javascript:", Pattern.CASE_INSENSITIVE);
                value = scriptPattern.matcher(value).replaceAll("");
                // 避免 vbscript:表达式
                scriptPattern = Pattern.compile("vbscript:", Pattern.CASE_INSENSITIVE);
                value = scriptPattern.matcher(value).replaceAll("");
                // 避免 onload= 表达式
                scriptPattern = Pattern.compile("onload(.*?)=",
                        Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL);
                value = scriptPattern.matcher(value).replaceAll("");
            }
            return value;
        }
    
    }

package com.hzlh.filter;
    
    import java.io.IOException;
    
    import javax.servlet.Filter;
    import javax.servlet.FilterChain;
    import javax.servlet.FilterConfig;
    import javax.servlet.ServletException;
    import javax.servlet.ServletRequest;
    import javax.servlet.ServletResponse;
    import javax.servlet.http.HttpServletRequest;
    
    /**
     * xss过滤器
     */
    public class XssFilter implements Filter {
    
        FilterConfig filterConfig = null;
    
        @Override
        public void init(FilterConfig filterConfig) throws ServletException {
            this.filterConfig = filterConfig;
        }
    
        @Override
        public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
                throws IOException, ServletException {
            //对请求进行拦截,防xss处理
            chain.doFilter(new XssHttpServletRequestWrapper((HttpServletRequest) request), response);
        }
    
        @Override
        public void destroy() {
            this.filterConfig = null;
        }
    
    }

[https://blog.csdn.net/b954960630/article/details/78705512][https_blog.csdn.net_b954960630_article_details_78705512]

[https_blog.csdn.net_b954960630_article_details_78705512]: https://blog.csdn.net/b954960630/article/details/78705512