PHP代码安全性问题的建议
PHP包括其他任何网络编程语言的安全性,具体表现在本地安全性和远程安全性两个方面，这里我们应该养成如下的几个习惯确保我们的PHP程序本身是安全的.
1、验证用户输入的任何数据,保证PHP代码的安全
这里有一个技巧就是使用白名单,所谓白名单就是说:我们要求用户的数据应该是这样的,例如我们要求用户的输入是一个数字,我们就只检验这个值是否是一个数字就行了,而不必检验他到底是什么——其实他有可能是个恶意脚本.
对于这个检验我们不能只在客户端的javascript进行,战地认为JS只是为了提高来访用户的体验而产生的,而不是验证的工具,因为任何一个来访的用户都可能会,也有可能无意间就禁用了客户端脚本的执行,从而跳过这层验证,所以我们必须在PHP的服务器端程序上检验这些数据.
2、保护数据库的安全——对即将运行于数据库的Sql语句进行安全性预处理.
任何时候都要对执行前的Mysql语句,进行mysql_real_escape_string操作——该函数的用法请参考PHP手册,诸多PHP的数据库抽象层例如ADODB都提供了类似的方法.
3、不要依赖不该依赖的PHP设置——环境有时候不可靠
不依赖，magic_quotes_gpc=On,在程序编制的过程,尽量关闭这个配置选项,任何时候判断这个选项后再对用户输入的数据进行处理,切记——PHP v6 中将会删除这个选项,尽量在合适的时候使用addcslashes 系列函数——请参考手册.
4、验证数据来源，避免远程表单提交
不要使用$_SERVER['HTTP_REFERER']这个超级变量来检查数据的来源地址,一个很小的菜鸟黑客都会利用工具来伪造这个变量的数据,尽可能利用Md5,或者rand等函数来产生一个令牌,验证来源的时候,验证这个令牌是否匹配.
5、保护会话数据,特别是Cookies
Cookie是保存在用户的计算机上的,保存之后任何用户都有可能出于某种原因更改他,我们必须对敏感数据进行加密处理,Md5、sha1都是个不错的加密方法.
6、利用htmlentities()预防XSS攻击
对用户可能输入脚本语言的地方的数据进行htmlentities()操,将多数可以产生程序错误的用户输入进行实体化。记住要遵循第一个习惯:在 Web 应用程序的名称、电子邮件地址、电话号码和帐单信息的输入中用白名单中的值验证输入数据.
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随意转载~但请保留教程地址★
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