防止常見XSS 過濾 SQL注入 JAVA過濾器filter
阿新 • • 發佈：2019-01-08
XSS : 跨站指令碼攻擊(Cross Site Scripting)，為不和層疊樣式表(Cascading Style Sheets, CSS)的縮寫混淆，故將跨站指令碼攻擊縮寫為XSS。惡意攻擊者往Web頁面裡插入惡意html程式碼，當用戶瀏覽該頁之時，嵌入其中Web裡面的html程式碼會被執行，從而達到惡意攻擊使用者的特殊目的。
sql注入
所謂SQL注入，就是通過把SQL命令插入到Web表單提交或輸入域名或頁面請求的查詢字串，最終達到欺騙伺服器執行惡意的SQL命令。具體來說，它是利用現有應用程式，將（惡意）的SQL命令注入到後臺資料庫引擎執行的能力，它可以通過在Web表單中輸入（惡意）SQL語句得到一個存在安全漏洞的網站上的資料庫，而不是按照設計者意圖去執行SQL語句。
1、首先配置web.xml，新增如下配置資訊：
2、編寫過濾器<!-- 解決xss & sql漏洞 --> <filter> <filter-name>xssAndSqlFilter</filter-name> <filter-class>com.cup.cms.web.framework.filter.XssAndSqlFilter</filter-class> </filter> <!-- 解決xss & sql漏洞 --> <filter-mapping> <filter-name>xssAndSqlFilter</filter-name> <url-pattern>*</url-pattern> </filter-mapping>
3、包裝器/** * */ package com.cup.cms.web.framework.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; /** * @Author hithedy * @Date 2016年2月2日 * @Time 下午2:01:53 */ public class XssAndSqlFilter implements Filter { @Override public void destroy() { // TODO Auto-generated method stub } @Override public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { XssAndSqlHttpServletRequestWrapper xssRequest = new XssAndSqlHttpServletRequestWrapper((HttpServletRequest) request); chain.doFilter(xssRequest, response); } @Override public void init(FilterConfig arg0) throws ServletException { // TODO Auto-generated method stub } }
/**
*
*/
package com.cup.cms.web.framework.filter;
import java.util.regex.Pattern;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
/**
* @Author hithedy
* @Date 2016年2月2日
* @Time 下午2:03:19
*/
public class XssAndSqlHttpServletRequestWrapper extends HttpServletRequestWrapper {
HttpServletRequest orgRequest = null;
public XssAndSqlHttpServletRequestWrapper(HttpServletRequest request) {
super(request);
orgRequest = request;
}
/**
* 覆蓋getParameter方法，將引數名和引數值都做xss & sql過濾。<br/>
* 如果需要獲得原始的值，則通過super.getParameterValues(name)來獲取<br/>
* getParameterNames,getParameterValues和getParameterMap也可能需要覆蓋
*/
@Override
public String getParameter(String name) {
String value = super.getParameter(xssEncode(name));
if (value != null) {
value = xssEncode(value);
}
return value;
}
/**
* 覆蓋getHeader方法，將引數名和引數值都做xss & sql過濾。<br/>
* 如果需要獲得原始的值，則通過super.getHeaders(name)來獲取<br/>
* getHeaderNames 也可能需要覆蓋
*/
@Override
public String getHeader(String name) {
String value = super.getHeader(xssEncode(name));
if (value != null) {
value = xssEncode(value);
}
return value;
}
/**
* 將容易引起xss & sql漏洞的半形字元直接替換成全形字元
*
* @param s
* @return
*/
private static String xssEncode(String s) {
if (s == null || s.isEmpty()) {
return s;
}else{
s = stripXSSAndSql(s);
}
StringBuilder sb = new StringBuilder(s.length() + 16);
for (int i = 0; i < s.length(); i++) {
char c = s.charAt(i);
switch (c) {
case '>':
sb.append("＞");// 轉義大於號
break;
case '<':
sb.append("＜");// 轉義小於號
break;
case '\'':
sb.append("＇");// 轉義單引號
break;
case '\"':
sb.append("＂");// 轉義雙引號
break;
case '&':
sb.append("＆");// 轉義&
break;
case '#':
sb.append("＃");// 轉義#
break;
default:
sb.append(c);
break;
}
}
return sb.toString();
}
/**
* 獲取最原始的request
*
* @return
*/
public HttpServletRequest getOrgRequest() {
return orgRequest;
}
/**
* 獲取最原始的request的靜態方法
*
* @return
*/
public static HttpServletRequest getOrgRequest(HttpServletRequest req) {
if (req instanceof XssAndSqlHttpServletRequestWrapper) {
return ((XssAndSqlHttpServletRequestWrapper) req).getOrgRequest();
}
return req;
}
/**
*
* 防止xss跨指令碼攻擊（替換，根據實際情況調整）
*/
public static String stripXSSAndSql(String value) {
if (value != null) {
// NOTE: It's highly recommended to use the ESAPI library and
// uncomment the following line to
// avoid encoded attacks.
// value = ESAPI.encoder().canonicalize(value);
// Avoid null characters
/** value = value.replaceAll("", "");***/
// Avoid anything between script tags
Pattern scriptPattern = Pattern.compile("<[\r\n| | ]*script[\r\n| | ]*>(.*?)</[\r\n| | ]*script[\r\n| | ]*>", Pattern.CASE_INSENSITIVE);
value = scriptPattern.matcher(value).replaceAll("");
// Avoid anything in a src="http://www.yihaomen.com/article/java/..." type of e-xpression
scriptPattern = Pattern.compile("src[\r\n| | ]*=[\r\n| | ]*[\\\"|\\\'](.*?)[\\\"|\\\']", Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL);
value = scriptPattern.matcher(value).replaceAll("");
// Remove any lonesome </script> tag
scriptPattern = Pattern.compile("</[\r\n| | ]*script[\r\n| | ]*>", Pattern.CASE_INSENSITIVE);
value = scriptPattern.matcher(value).replaceAll("");
// Remove any lonesome <script ...> tag
scriptPattern = Pattern.compile("<[\r\n| | ]*script(.*?)>", 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 e-xpression(...) expressions
scriptPattern = Pattern.compile("e-xpression\\((.*?)\\)", Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL);
value = scriptPattern.matcher(value).replaceAll("");
// Avoid javascript:... expressions
scriptPattern = Pattern.compile("javascript[\r\n| | ]*:[\r\n| | ]*", Pattern.CASE_INSENSITIVE);
value = scriptPattern.matcher(value).replaceAll("");
// Avoid vbscript:... expressions
scriptPattern = Pattern.compile("vbscript[\r\n| | ]*:[\r\n| | ]*", Pattern.CASE_INSENSITIVE);
value = scriptPattern.matcher(value).replaceAll("");
// Avoid onload= expressions
scriptPattern = Pattern.compile("onload(.*?)=", Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL);
value = scriptPattern.matcher(value).replaceAll("");
}
return value;
}
}