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Homephp教程php手册防范SQL注入攻击的代码

防范SQL注入攻击的代码

Jun 13, 2016 am 10:11 AM
sqlsuperiorcodeuseexistattackyesserverinjectionloopholesofTargetprecaution

SQL注入式攻击是利用是指利用设计上的漏洞,在目标服务器上运行Sql命令以及进行其他方式的攻击,动态生成Sql命令时没有对用户输入的数据进行验证是Sql注入攻击得逞的主要原因。比如:
  如果你的查询语句是select * from admin where username=‘"&user&"‘ and password=‘"&pwd&"‘"
  那么,如果我的用户名是:1‘ or ‘1‘=‘1
  那么,你的查询语句将会变成:
select * from admin where username=‘1 or ‘1‘=‘1‘ and password=‘"&pwd&"‘"
  这样你的查询语句就通过了,从而就可以进入你的管理界面。
  所以防范的时候需要对用户的输入进行检查。特别式一些特殊字符,比如单引号,双引号,分号,逗号,冒号,连接号等进行转换或者过滤。
  需要过滤的特殊字符及字符串有:
 net user
 xp_cmdshell
 /add
 exec master.dbo.xp_cmdshell
 net localgroup administrators
 select
 count
 Asc
 char
 mid
 ‘
 :
 "
 insert
 delete from
 drop table
 update
 truncate
 from
 %
  下面是我写的两种关于解决注入式攻击的防范代码,供大家学习参考!
  js版的防范SQL注入式攻击代码~:
[CODE START]  

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