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web项目：漏洞修复（3）_struts2拦截器
只需要一个java文件+struts.xml的配置
1.java类IllegalCharacterInterceptor.java 可在相应位置 ，指定过滤的 方法、参数（参数值、参数名）等，可过滤指定元素
package com.*.*.*.util;
import java.util.Iterator;
import java.util.Map;
import java.util.Map.Entry;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import javax.servlet.http.HttpServletRequest;
import org.apache.commons.lang.StringEscapeUtils;
import org.apache.struts2.StrutsStatics;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.AbstractInterceptor;
import com.opensymphony.xwork2.util.ValueStack;
/**
* 拦截器-请求拦截过滤
*/
public class IllegalCharacterInterceptor extends AbstractInterceptor {
private static Pattern SCRIPT_PATTERN = Pattern.compile("<script.*>.*<\\/script\\s*>");
private static Pattern HTML_PATTERN = Pattern.compile("<[^>]+>");
private static Pattern SQL_PATTERN1 = Pattern.compile("/((\\%3D)|(=))[^\\n]*((\\%27)|(\\)|(\\-\\-)|(\\%3B)|(:))/ix");
private static Pattern SQL_PATTERN2 = Pattern.compile("/\\w*((\\%27)|(\\'))((\\%6F)|o|(\\%4F))((\\%72)|r|(\\%52))/ix");
private static Pattern SQL_PATTERN3 = Pattern.compile("/((\\%27)|(\\'))union/ix");
@Override
public String intercept(ActionInvocation invocation) throws Exception {
// System.out.println("+++++++++++++invocation+++++++++++++++++++++");
// 通过核心调度器invocation来获得调度的Action上下文
ActionContext actionContext = invocation.getInvocationContext();
//String actionName = invocation.getProxy().getActionName();//ActionName
//获得请求
HttpServletRequest request= (HttpServletRequest) actionContext.get(StrutsStatics.HTTP_REQUEST);
//获得请求路径
String url=request.getRequestURI();
// System.out.println("URL=="+url);
// System.out.println("Action"+invocation.getAction().getClass().getName());
// System.out.println("Struts2 Action"+invocation.getProxy().getActionName());
// System.out.println(""+invocation.getProxy().getMethod());
// 获取Action上下文的值栈
ValueStack stack = actionContext.getValueStack();
// 获取上下文的请求参数
Map valueTreeMap = actionContext.getParameters();
// 获得请求参数集合的迭代器
Iterator iterator = valueTreeMap.entrySet().iterator();
// 遍历组装请求参数
while (iterator.hasNext()) {
// 获得迭代的键值对
Entry entry = (Entry) iterator.next();
// 获得键值对中的键值
String key = (String) entry.getKey();
// 原请求参数，因为有可能一键对多值所以这里用的String[]
String[] oldValues = null;
// 对参数值转换成String类型的
if (entry.getValue() instanceof String) {
oldValues = new String[] { entry.getValue().toString() };
} else {
oldValues = (String[]) entry.getValue();
}
// 处理后的请求参数
String newValueStr = null;
// 对请求参数过滤处理
if ( isUrlContains(url) && isKeySqlFunctions(key)) {
//System.out.println("URL KEY ");
//
newValueStr=null;
} else {
//
if (oldValues.length > 1) {
newValueStr = "{";
for (int i = 0; i < oldValues.length; i++) {
// 替换掉非法参数，这里只替换掉了'，如有其他需求，可以专门写一个处理字符的类
//System.out.println("开始参数内容的过滤");
newValueStr += replaceString(oldValues[i].toString());
if (i != oldValues.length - 1) {
newValueStr += ",";
}
}
newValueStr += "}";
} else if (oldValues.length == 1) {
// 替换掉非法参数，这里只替换掉了'，如有其他需求，可以专门写一个处理字符的类
//System.out.println("开始参数内容的过滤");
newValueStr = replaceString(oldValues[0].toString());
} else {
newValueStr = null;
}
}
// 处理后的请求参数加入值栈中
stack.setValue(key, newValueStr);
}
String result = null;
try {
// 调用下一个拦截器，如果拦截器不存在，则执行Action
result = invocation.invoke();
} catch (Exception e) {
e.printStackTrace();
}
/* Map<String, Object> cacheMap = cache.getMapCache();*/
return result;
}
/**
* 对Value进行过滤
* @param oldValue
* @return
*/
private String replaceString(String oldValue) {
System.out.println("----------------"+oldValue);
String newValue = oldValue;
newValue= StringEscapeUtils.escapeSql(newValue);
// 过滤html标签
Matcher mHtml = HTML_PATTERN.matcher(newValue);
if (mHtml.find()) {
newValue = "";
}
// 过滤script脚本
Matcher m = SCRIPT_PATTERN.matcher(newValue);
if (m.find()) {
newValue = "";
}
Matcher sql1 = SQL_PATTERN1.matcher(newValue);
if (sql1.find()) {
newValue = "";
}
Matcher sql2 = SQL_PATTERN2.matcher(newValue);
if (sql2.find()) {
newValue = "";
}
Matcher sql3 = SQL_PATTERN3.matcher(newValue);
if (sql3.find()) {
newValue = "";
}
// <>
newValue = newValue.replaceAll("&","&" );
newValue = newValue.replaceAll("<","<");
newValue = newValue.replaceAll(">",">");
newValue = newValue.replaceAll(""","\"");
newValue = newValue.replaceAll("<", "");
newValue = newValue.replaceAll(">", "");
//
newValue = newValue.replaceAll("ScRipt", "");
newValue = newValue.replaceAll("script", "");
newValue = newValue.replaceAll("WEB-INF", "");
newValue = newValue.replaceAll("../", "");
newValue = newValue.replaceAll("./", "");
newValue = newValue.replaceAll("%20", "");
newValue = newValue.replaceAll(".java", "");
newValue = newValue.replaceAll(".xml", "");
newValue = newValue.replaceAll(".class", "");
newValue = newValue.replaceAll("alert", "");
newValue = newValue.replaceAll("%3E", "");
// sql
newValue = newValue.replaceAll("chr[(] ", "");
newValue = newValue.replaceAll("chr [(] ", "");
newValue = newValue.replaceAll("ascii [(] ", "");
newValue = newValue.replaceAll("ascii[(] ", "");
// sql
newValue = newValue.replaceAll("create ", "");
newValue = newValue.replaceAll("truncate ", "");
newValue = newValue.replaceAll("drop ", "");
newValue = newValue.replaceAll("insert ", "");
newValue = newValue.replaceAll("delete ", "");
newValue = newValue.replaceAll("select ", "");
newValue = newValue.replaceAll("lock table ", "");
newValue = newValue.replaceAll("update ", "");
System.out.println("----------------"+newValue);
return newValue;
}
/**
* й--
* @param key
* @return
*/
private boolean isKeySqlFunctions(String key){
boolean isSqlFunction=false;
if(key.contains("drop")
|| key.contains("insert")
|| key.contains("update")
|| key.contains("delete")
|| key.contains("select")
|| key.contains("__")
)
{
isSqlFunction=true;
}
return isSqlFunction;
}
/**
* URLй--
* @param key
* @return
*/
private boolean isUrlContains(String url){
boolean isUrlContain=false;
if(url.contains("reservation/hos_showReservation")
|| url.contains("reservation/hos_search")
)
{
isUrlContain=true;
}
return isUrlContain;
}
}
2.struts.xml 配置拦截器
<interceptors>
<!-- Action请求拦截过滤-->
<interceptor name="illegalCharacter" class="com.just.reserve.common.util.IllegalCharacterInterceptor"/>
<!-- 登录拦截过滤-->
<interceptor name="checkLogin" class="com.just.reserve.interceptor.LoginInterceptor" />
<interceptor-stack name="myStack">
<interceptor-ref name="defaultStack" />
<interceptor-ref name="illegalCharacter" />
<interceptor-ref name="checkLogin" />
</interceptor-stack>
</interceptors>
这里登录拦截 原理和上面的过滤拦截是一样的 | 
转播
