因此,我已经在我的Azure云服务站点上启用了此功能,以尝试减少蜘蛛和机器人对我们的攻击次数。
有人有这些设置的经验吗?
基于并发请求数量拒绝IP地址: 最大并发请求数量是多少?
基于一段时间内的请求数量拒绝IP地址: 最大请求数量是多少? 时间段(以毫秒为单位)是多少?
因此,我已经在我的Azure云服务站点上启用了此功能,以尝试减少蜘蛛和机器人对我们的攻击次数。
有人有这些设置的经验吗?
基于并发请求数量拒绝IP地址: 最大并发请求数量是多少?
基于一段时间内的请求数量拒绝IP地址: 最大请求数量是多少? 时间段(以毫秒为单位)是多少?
最近我一直在尝试这些设置,以决定我们的生产站点的值。
我们确定了单个(请求密集的)页面生成的最大请求数,并将其乘以2.5以获得随时间变化的最大请求数。对于时间值,我选择了200ms。
手动测试表明,这些设置对“正常”使用效果良好。当我们在浏览器中同时重新加载5个或更多选项卡时,我们会遇到一些403 Forbidden。
您必须记住的一件事是,您网站的许多用户可能坐在同一个代理后面,因此动态IP限制将这些用户视为一个用户。由于时间窗口相对较短(200毫秒),我预计这不会成为问题,同时在一定程度上阻止攻击。
此外,我们不限制同时连接的数量。在此处找到合理的数字几乎是不可能的,因为不同客户端的数量可能是无限的。
请注意,单个页面(取最多请求的页面)的请求对于获取有用的设置非常重要。例如,如果您的主页加载生成10个请求到您的服务器,那么这些请求将在非常短的时间内完成,因此您的限制必须有更高的阈值。
我们的服务已经使用这些设置运行了一年多了,到目前为止,我们感到非常满意。
<%
' ***PUT THIS CODE AT THE TOP OF YOUR WEBPAGE YOU WANT TO PROTECT***
' COULD BE HOME PAGE AND/OR INTERNAL PAGE
' THE BAN IS PERSISTANT UNTIL THE SERVER RESTART
response.buffer = true
IP = Request.ServerVariables("REMOTE_ADDR")
'IP WHITELIST - SEPARATE EACH IP WITH A |
IPWL = "127.0.0.1|"
if instr(IPWL,IP) then
'do nothing the ip is whitelisted
else
'CHECK IF THERE IS A BAN THAT MATCH THE CURRENT IP
if Application("mybanip") <> "" then
if instr(Application("mybanip"),IP) then
' RESPONSE EXAMPLE WHEN ACCESS DENIED (CHOOSE ONE OR MAKE YOUR)
'Response.Status = "403 Forbidden"
'Response.Status = "404 Not Found"
'response.redirect "banned.html"
response.write "You are going too fast !"
session.abandon
response.end
end if
end if
' THE TIME NOW
dtime = FormatDateTime(now(),3)
'we can decide to run it at speficied time
'if dtime >= "00:00:00" and dtime < "05:00:00" then
' PREPARE TO CHECK DATABASE FOR THE LAST 3 SECONDS ACTIVITY
secfrom = DateAdd("s",-3,now()) 'value you can change is -3 (seconds)
secfrom = FormatDateTime(secfrom,3)
' ***OPEN THE CONNEXION STRING (USE YOUR ONE OR MODIFY THIS)***
Set conn = Server.CreateObject("ADODB.Connection")
conn.Open "DRIVER={MySQL ODBC 3.51 Driver};server=127.0.0.1;uid=LOGIN;pwd=PSW;Database=DBNAME;"
' ***EVERYTHING BELOW MUST BE PUT AFTER THE CONNEXION STRING OPENED***
' POPULATE DATABASE WHIS THE CURRENT IP AND TIME
SQL = "INSERT INTO BANIP (IP,DTIME) values('" & IP & "','" & dtime & "')"
conn.execute(SQL)
' CHECK IF THERE IS A SPAM ACTIVITY FOR THE CURRENT IP
SQL = "SELECT COUNT(IP) as nbfound FROM BANIP WHERE IP='" & IP & "' AND dtime BETWEEN '" & secfrom & "' AND '" & dtime & "'"
set rsIPCount = conn.Execute(SQL)
if not rsIPCount.Eof then
ipcount = clng(rsIPCount("nbfound"))
else
ipcount = "0"
end if
rsIPCount.Close
set rsIPCount = nothing
' IF THERE IS AT LEAST 3 WEBPAGE LOADED IN 3 SECONDS ACTIVITY THEN SET A BAN
if ipcount >= 3 then 'value you can change is 3 (webpage)
application.lock
Application("mybanip") = Application("mybanip") & IP & "|"
application.unlock
end if
' DELETE ALL ENTRY EVERY 2 MINUTES FOR PERFORMANCE
if Application("mybanipdel") = "" then
Application("mybanipdel") = dtime
elseif datediff("n", Application("mybanipdel"), dtime) >= 2 or datediff("n", Application("mybanipdel"), dtime) < 0 then 'value you can change is 2 (minutes)
conn.execute "DELETE FROM BANIP"
Application("mybanipdel") = FormatDateTime(now(),3)
end if
SQL = ""
IP = ""
end if
%>
管理员页面 mybanipadm.asp
<html>
<head>
<title>My admin</title>
</head>
<body><%
if request.querystring("disconnect")="yes" then
session("adm") =""
elseif request.querystring("clear")="yes" then
Application("mybanip") = ""
end if
' ***CHANGE THIS VALUES***
login = "login"
passw = "pass"
if request.form("LogMe")<>"" and (request.form("login")=login and request.form("passw")=passw) then
session("adm") = "loggued"
elseif session("adm") = "" then
response.write "<p>Please log-in :</p> <form method=""post""><input type=""text"" size=""15"" name=""login"" placeholder=""login""> <input type=""password"" size=""15"" name=""passw"" placeholder=""password""><input type=""submit"" name=""LogMe""></form>"
response.end
end if
response.write "<p><a href=""?disconnect=yes"">Disconnect from the admin</a> - <a href=""?clear=yes"">Clear all ip</a></p>"
if request.form("unban")<>"" and request.form("ipban")<>"" then
application.lock
Application("mybanip") = replace(Application("mybanip"),request.form("ipban") & "|","")
application.unlock
response.write "<p>IP : <b>" & request.form("ipban") & "</b> has been unbanned !</p>"
end if
response.write "Unban this IP : <form method=""post""><input type=""text"" size=""15"" maxlenght=""15"" name=""ipban"" placeholder=""000.000.000.000""> <input type=""submit"" name=""Unban"" value=""Unban""></form>"
response.write "<p>IP CURRENTLY BANNED</p>" & replace(Application("mybanip"),"|","<br>")
%>
</body>
</html>