XSS:
跨站腳本攻擊.(Cross SiteScripting),為不和層疊樣式表(Cascading style Sheet,CSS),就這么寫了.
惡意攻擊者往往向Web頁面里插入惡意HTML代碼,當(dāng)用戶瀏覽該頁的時候,嵌入其中Web里面的HTML代碼會執(zhí)行,從而達(dá)到而已攻擊用戶的特殊目的.
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符串栓始，最終達(dá)到欺騙服務(wù)器執(zhí)行惡意的SQL命令。具體來說邻遏，它是利用現(xiàn)有應(yīng)用程序，將（惡意）的SQL命令注入到后臺數(shù)據(jù)庫引擎執(zhí)行的能力莫辨，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(wǎng)站上的數(shù)據(jù)庫，而不是按照設(shè)計者意圖去執(zhí)行SQL語句辜羊。
解決方法:
<!-- 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>
2.編寫過濾器
/**
*
*/
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
}
}
3.類包裝器
/**
*
*/
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方法寂屏，將參數(shù)名和參數(shù)值都做xss & sql過濾。<br/>
* 如果需要獲得原始的值蠕趁，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方法薛闪，將參數(shù)名和參數(shù)值都做xss & sql過濾。<br/>
* 如果需要獲得原始的值俺陋，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漏洞的半角字符直接替換成全角字符
*
* @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(zhuǎn)義大于號
break;
case '<':
sb.append("＜");// 轉(zhuǎn)義小于號
break;
case '\'':
sb.append("＇");// 轉(zhuǎn)義單引號
break;
case '\"':
sb.append("＂");// 轉(zhuǎn)義雙引號
break;
case '&':
sb.append("＆");// 轉(zhuǎn)義&
break;
case '#':
sb.append("＃");// 轉(zhuǎn)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(tài)方法
*
* @return
*/
public static HttpServletRequest getOrgRequest(HttpServletRequest req) {
if (req instanceof XssAndSqlHttpServletRequestWrapper) {
return ((XssAndSqlHttpServletRequestWrapper) req).getOrgRequest();
}
return req;
}
/**
*
* 防止xss跨腳本攻擊（替換豁延，根據(jù)實際情況調(diào)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;
}
}
