Forum Discussion

Sushant's avatar
Sushant
Icon for Altostratus rankAltostratus
Apr 02, 2021

Restricting direct access from public IP

My website that resides under BIG IP F5 can directly be opened making use of public IP. As my site is one to one NAT'd and and one application under one public IP it can directly be opened using public IP. I want to restrict making use of opening the site directly via the public IP and available only through domain. Please, do let me know if there is any way that I can achieve this .

BIG-IP
LTM
security
  • spalande's avatar
    spalande
    Apr 03, 2021

    If you VIP hosts single domain then use this to whitelist it

    when HTTP_REQUEST {
 switch [string tolower [HTTP::host]] {
 "www.domain.com" 
  {
   return
  }
 default { 
   reject
  }
 }
}

    If VIP hosts multiple domains/SAN use below to whitelist all

    when HTTP_REQUEST {
 switch [string tolower [HTTP::host]] {
 "www.domain1.com" -
 "www.domain2.com" -
 "www.domain3.com" 
 {
   return
  }
 default { 
   reject
  }
 }
}
  • spalande's avatar
    spalande
    Icon for Nacreous rankNacreous
    Apr 02, 2021

    You can use iRule, LTM policy or ASM profile to reject the requests coming with IP as HOST header. Let me know if you need further help with any of it.

    • Sushant's avatar
      Sushant
      Icon for Altostratus rankAltostratus
      Apr 03, 2021

      thank you for the reply...can you share me the irule if possible ?

       

       

    • Sushant's avatar
      Sushant
      Icon for Altostratus rankAltostratus
      Apr 03, 2021
      1. when HTTP_REQUEST {
      2. if { [HTTP::header "Host"] equals " " } {
      3. reject
      4. }
      5. }

       

      tryin to use this irule without any success

      • spalande's avatar
        spalande
        Icon for Nacreous rankNacreous
        Apr 03, 2021

        If you VIP hosts single domain then use this to whitelist it

        when HTTP_REQUEST {
 switch [string tolower [HTTP::host]] {
 "www.domain.com" 
  {
   return
  }
 default { 
   reject
  }
 }
}

        If VIP hosts multiple domains/SAN use below to whitelist all

        when HTTP_REQUEST {
 switch [string tolower [HTTP::host]] {
 "www.domain1.com" -
 "www.domain2.com" -
 "www.domain3.com" 
 {
   return
  }
 default { 
   reject
  }
 }
}