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#!/usr/bin/env python
'''
Copyright (C) 2020, WAFW00F Developers.
See the LICENSE file for copying permission.
'''
NAME = ' NetScaler AppFirewall (Citrix Systems) '
def is_waf ( self ) :
# 定义用于检测是否存在特定 Web 应用防火墙（ ）
schemes = [
# 检查响应头中的'Via'字段是否为'NS-CACHE'，此头可以在非攻击模式下获得。
self . matchHeader ( ( ' Via ' , r ' NS \ -CACHE ' ) ) ,
# 检查是否存在特定格式的 Cookie，
self . matchCookie ( r ' ^(ns_af=|citrix_ns_id|NSC_) ' ) ,
# 检查响应内容中是否包含'(NS Transaction|AppFW Session) id'。
self . matchContent ( r ' (NS Transaction|AppFW Session) id ' ) ,
# 检查响应内容中是否包含'Violation Category. [最多五个任意字符] APPFW_'。
self . matchContent ( r ' Violation Category. { 0,5}?APPFW_ ' ) ,
# 检查响应内容中是否包含'Citrix|NetScaler'。
self . matchContent ( r ' Citrix \ |NetScaler ' ) ,
# 比较可靠，但并非所有服务器都会返回这个头，且在攻击模式下检查。
self . matchHeader ( ( ' Cneonction ' , r ' ^(keep alive|close) ' ) , attack = True ) ,
self . matchHeader ( ( ' nnCoection ' , r ' ^(keep alive|close) ' ) , attack = True )
]
# 如果方案列表中的任何一个条件为真，则认为检测到了 WAF。
if any ( i for i in schemes ) :
return True
else :
return False
