Ibatis sql注入 注意！！
在项目中，运用Ibatis中Like写法，没有研究下，结果SQL语句存在SQL注入漏洞，整理下，下次谨记啊！
sql语句：
select *
from ( select 1 from poll
<dynamic prepend= " where " >
<isNotEmpty prepend=" and " property= "title" >
title like '%$title$%'
</isNotEmpty>
<isNotEmpty property="used" >
<isEqual compareValue="true" prepend= " and " property= "used" >
<![CDATA[status & 2 > 0 and status & 1 <= 0 and status & 8 <= 0 ]]>
</isEqual>
</isNotEmpty>
<isNotEmpty prepend=" and " property= "startTimeBegin" >
<![CDATA[ gmt_create >= #startTimeBegin# ]]>
</isNotEmpty>
<isNotEmpty prepend=" and " property= "startTimeEnd" >
<![CDATA[ gmt_create <= #startTimeEnd# ]]>
</isNotEmpty>
</dynamic >
limit 10000
) as t
select *
from (select 1 from poll
<dynamic prepend=" where ">
<isNotEmpty prepend=" and " property="title">
title like '%$title$%'
</isNotEmpty>
<isNotEmpty property="used">
<isEqual compareValue="true" prepend=" and " property="used">
<![CDATA[status & 2 > 0 and status & 1 <= 0 and status & 8 <= 0 ]]>
</isEqual>
</isNotEmpty>
<isNotEmpty prepend=" and " property="startTimeBegin">
<![CDATA[ gmt_create >= #startTimeBegin# ]]>
</isNotEmpty>
<isNotEmpty prepend=" and " property="startTimeEnd">
<![CDATA[ gmt_create <= #startTimeEnd# ]]>
</isNotEmpty>
</dynamic>
limit 10000
) as t
请关注此写法的：
title like '%$title$%'
title like '%$title$%'
存在SQL注入漏洞。
下面是一段单元测试：
Java代码
PollQuery query = new PollQuery();
query.setCurrentPage(1 );
query.setPageSize(50 );
query.setTitle("1231%' or '1%' = '1" ); //很简单的写法:(
List<SnsPollDO> l = pollDAO.findPollList(query);
System.out.println(l.size())
[java] view plaincopy
PollQuery query = new PollQuery();
query.setCurrentPage(1);
query.setPageSize(50);
query.setTitle("1231%' or '1%' = '1");//很简单的写法:(
List<SnsPollDO> l = pollDAO.findPollList(query);
System.out.println(l.size())
测试结果（打印处的sql语句）：
select * from poll where title like '%1231%' or '1%' = '1%'
[java] view plaincopy
1. select * from poll where title like '%1231%' or '1%' = '1%'
尽管title 没匹配对，但是or后面那句是恒等的。哎！
看来下面的写法只是简单的转义下：
title like '%$title$%'
title like '%$title$%'
如何解决：
在oracle下面改成：title like '%'||#title#||'%'，这样肯定是可以的。
但是在mysql中，上述写法是不行，还是有上面的问题的：
select * from poll where title like '%' ||?|| '%' order by gmt_create desc limit ?, ?
select * from poll where title like '%'||?||'%' order by gmt_create desc limit ?, ?
还能查出结果来！哎！
得用：title CONCAT('%',#title#,'%')
select * from poll where title like CONCAT( '%' ,?, '%' ) order by gmt_create desc limit ?, ?
呵呵，多次测试均没有发现问题！
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以下读者注：
是否为：title like CONCAT('%',#title#,'%')
作者 oswin_jiang的专栏
