Restricting access to a virtual server by Public IP address should access through only domain name.

Forums Technical Forums
1

We had Published  website on F5 with Domain name ,now created domain is aviable in public ,but publish website is also accessible  with ip address in public domain.( we have created server pool )

Website must be only accessible through Domain name only .

We tried to created iRule for same Domain but its given error to assign HTTP profile .

We tried to applied HTTP profile to domain but domain virtual server pool go down and domain is unaviable .

we are using F5 current version is 11.5.8

Kindly suggest work around for version 11.5.8

i am new to F5

2

Hello,

please note first, that version 11.5.8 is out of any supprt and service from April 8, 2019 as you can see in BIG-IP software support policy (f5.com)

For your problem, solution via iRule is a viable. also you could utilize LTM Policies.
But as you describe you can’t add the iRule (which is based on HTTP Events) because you do not have any HTTP Profile on Virtual Server.
This Profile is required to validate or manipulate data on HTTP Layer.

And as you described you also have application issues if you apply an HTTP Profile it seems that the Application is protected by SSL / TLS. In this case you would also need an Client SSL / Server SSL profile

So the F5 will be able to decrypt and encrypt the connection and after that apply the http profile to make your iRule work.

But most important: Get an updated F5. This software Version is old and has maaaaaany Security and operating flaws

Regards

3

Hi  @vishu_chavan  ,

Could you please send the irule script that you use now.

> it’s mandatory to assign http profile for this irule. 
> although you have a non supported version and you need to upgrade , but try the below irule script :

when HTTP_REQUEST {
	    if { ([HTTP::host] != "www.example.com") } {
	       reject
	    }
	}

> Replace “www.example.com” by your correct FQDN. 
and let me know the results

4

Thanks for reply

yes we knew F5 is running on old version and it is out of date .new F5 is in process as it will take time .

Can you please, Guide me how to apply   SSL / TLS for virtual server .

Thanks in advance .

5

Hi  F5-Enthusiast

Thanks for your reply .Tried your solutions

I applied  Client SSL / Server SSL profile & HTTP profile on website and added iRule for website

iRule script below

when HTTP_REQUEST {
switch [string tolower [HTTP::host]] {
“www.domian.com”
{
return
}
default {
reject
}
}
}

All Setting Successfully applied .Now i can access website with only domain name ,BUT while accessing website with domain its show my ssl certificate is expired .Treid to view same certificate it show some IT or local certificate .

As earier my website ssl certificate is  secure and working.

Kindly suggest for same .

Thanks in advance.

6 

you can try below irule as well 

replace x.x.x.x with your ip address

when HTTP_REQUEST {
If { !([HTTP::host] equals "x.x.x.x") } {
Reject
}
}

7

seems you have not used your Domain certificate under client ssl profile , check thebelow link to upload your CA domain certificate and key to bigip and followed to that you need to create client ssl profile point to your Domain certificate/key and any chain certificate.

once done you check your domain for any ssl issue by running test in below link

8

Thanks for adivise .

Now i can access website only through Doamin name but not by Ip address.

All setting sucessfully applied and working .Thanks all

But just i need some information on iRule

As per now i have to create separate iRule for every virual server pool .

Ist possbile to have single iRule which can be applied  for all virtual server . bcoz there is Limit of space size for iRule.

my current iRule

when HTTP_REQUEST {
switch [string tolower [HTTP::host]] {
“www.domian.com”
{
return
}
default {
reject
}
}
}

9

hope you have multiple domains mapped to each virtual and need to restrict to request with domain not IP based with a single irule.

for this you can use the irule with datagroup , where datagroup have list of domains

eg:

when HTTP_REQUEST {
set domain [HTTP::host]

if {![class match $domain equals mydomain-DG} {
HTTP::respond 403 “Forbidden”
drop
}
}

as per this irule if the request doest match the domain in mydomain-DG datagroup then it will be de dorped. ,
you need to create a datagroup named mydomain-DG and the you domains

10

Hi all

Thanks to all for reply

Now my webiste is up and working with domain name , but after making virtual server for Domain

i am getting incoming interface IP address instead of original Public source ip address in logs for virtual server in firewall which is placed below F5 ( i can see orginal Public source ip address in F5 logs but not in Firewall )

Traffic Flow

Public Network-------------->F5--------------------->FIREWALL

I am use SNAT for Published Domain.

Is there any setting in Virtual pool /Server ,where i can get orginal public address in F5 and Firewall  logs.

11

As you have enabled SNAT, you will see the F5 interface or SNAT pool ip in your backendserver logs or Any firewall in between as source IP.

one way to get the actual client IP in server  for HTTP based traffic is to use the X-forwarded-For in http  profile and modify the Webserver to use the X-forwarded-for value from header as client IP (not sure your firewall can see the http header value)

other way  is to use the F5 interface/floating IP  as default gateway in your backendservers and disable SNAT.

12

hi ragu

Thanks for quick reply tried to apply suggest solution on virtual server

but still not getting orginial source ip address in firewall logs

If i only use snat ( without virtual server pool) i can get orginial source ip address in firewall logs

As i am running on oldest version of F5 kindly suggest apporiate workaround for mentioned version.