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web 防火墙，
Web应用防火墙(Web application firewall，WAF)主要用来保护Web应用免遭跨站脚本和SQL注入等常见攻击。WAF位于Web客户端和Web服务器之间，分析应用程序层的通信，从而发现违反预先定义好安全策略的行为。

    随着web2.0时代的到来，Web应用也逐渐被人广泛的接受和使用。当然，每个新技术的到来对应着其安全问题也接踵而来。面对Web安全问题，不同于IDS与IPS的新技术，Web应用防火墙也逐渐映入人们的眼中。

    Web应用防火墙(WAF)主要用来保护Web应用免遭跨站脚本和SQL注入等常见攻击。WAF位于Web客户端和Web服务器之间，分析应用程序层的通信，从而发现违反预先定义好安全策略的行为。
尽管某些传统防火墙也能提供一定程度的应用认知功能，但是它不具备WAF的精度和准度。举例来说，WAF可以检测一个应用程序是否按照其规定的方式运行，而且它能让你编写特定的规则来防止特定攻击行为的再次发生。

  Web应用防火墙（WAF）也不同于入侵防御系统(IPS)，两者是完全不同的两种技术，后者是基于签名，而前者是从行为来分析，它能够防护用户自己无意中制造的漏洞。

    目前Web应用防火墙的主要推动因素之一是支付卡行业数据安全标准(PCI DSS)，该标准主要通过两个办法来验证是否合规：WAF和代码审查。另外一个推动因素是，人们越来越多的认识到攻击已经开始由网络转移到应用程序。根据WhiteHat Security公布的一份研究报告，从2006年1月到2008年12月间对877个网站进行了评估，结果发现82%的网站至少存在一个高危或紧急安全漏洞。

    Web应用防火墙的主要特性
    Web应用防火墙市场仍然不确定，有很多不同的产品被归类到WAF范畴。研究机构Burton Group的分析师Ramon Krikken表示，“很多产品提供的功能了我们通常认为防火墙应该具有的功能，这使得产品的评价和比较难以进行。”此外，通过将已有的非WAF产品整合到综合产品中的方式，新厂商开始进入市场。
根据研究和咨询公司Xiom创始人Ofer Shezaf提供的清单，下面列出Web应用防火墙应该具备的功能特点：

深入理解HTTP。Web应用防火墙必须全面深入分析和解析HTTP的有效性。
提供明确的安全模型。明确的安全模型只允许已知流量通过，这就给应用程序提供了外部验证保护。

应用层规则。由于高昂的维护费用，明确的安全模型应该配合基于签名的系统来运作。不过由于web应用程序是自定义编码，传统的针对已知漏洞的签名是无效的。Web应用防火墙规则应该是通用的，并且能够发现像SQL注入这样的攻击变种。

基于会话的保护：HTTP的大弱势之一在于缺乏嵌入式的可靠的会话机制。Web应用防火墙必须实现应用程序会话管理，并保护应用程序免受基于会话的攻击和超时攻击。

允许细粒度政策管理。例外政策应该只对极少部分的应用程序执行，否则，可能会造成重大安全漏洞。
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