网页脚本攻击防范全攻略(2)

2016-07-13 15:45:32 

 程序体(1)

  另外,值得我们注意的是,很多站点在用户注册,或者是用户资料修改的页面上也缺少脚本的过滤,或者是只在其中之一进行过滤,注册进入后修改资料仍然可以进行脚本攻击。对用户提交的数据进行检测和过滤,程序体(2) 如下:

  ‘以下是过滤函数

  If Instr(request("username"),"=")>0 or
  Instr(request("username"),"%")>0 or
  Instr(request("username"),chr(32))>0 or
  Instr(request("username"),"?")>0 or
  Instr(request("username"),"&")>0 or
  Instr(request("username"),";")>0 or
  Instr(request("username"),",")>0 or
  Instr(request("username"),"'")>0 or
  Instr(request("username"),"?")>0 or
  Instr(request("username"),chr(34))>0 or
  Instr(request("username"),chr(9))>0 or
  Instr(request("username"),"?K")>0 or
  Instr(request("username"),"$")>0 or
  Instr(request("username"),">")>0 or
  Instr(request("username"),"<")>0 or
  Instr(request("username"),"""")>0 then
  response.write "朋友,你的提交用户名含有非法字符,请更改,谢谢合作 <a href='****:window.history.go(-1);'>返回</a>"
  response.end
  end if

  程序体(2)

  为了提供工作效率我们再将过滤内容程序化,这样对多个参数的过滤效率将有很大程度上的提高:如

  程序体(3)

  ‘以下为程序主体

  dim Bword(18)
  Bword(0)="?"
  Bword(1)=";"
  Bword(2)=">"
  Bword(3)="<"
  Bword(4)="-"
  Bword(5)="’"
  Bword(6)="””"
  Bword(7)="&"
  Bword(8)="%"
  Bword(9)="$"
  Bword(10)="'"
  Bword(11)=":"
  Bword(12)=" "
  Bword(13)="("
  Bword(14)=")"
  Bword(15)="--"
  Bword(16)=" chr(9)"
  Bword(17)=" chr(34)"
  Bword(18)=" chr(32)"
  errc=false

  ‘以下是应用实例部分

  for i= 0 to ubound(Bword)
  if instr(FQYs,Bword(i))<>0 then
  errc=true
  end if
  next
  if errc then
  response.write "<script language=""****"">"
  response.write "parent.alert('很抱歉!您的操作违法了);"
  response.write "history,back();"
  response.write "</script>"
  response.end
  end if

网页脚本攻击防范全攻略(2)》阅读地址:http://www.haoshilao.net/7734/