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raZorTT
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Oct 31, 2017

Secure a web service using APM

Hi

 

I'm looking to use the F5 to secure (basic auth) a web service that needs to be called from a .net application.

 

What is the best way to configure something like this, where the "client" isn't a browser?

 

The application doesn't appear to support the 302 redirects that a browser would, so do I need to create a fairly vanilla access profile (logon page - AD Auth - Allow) and then write an irule to send the inital 401 response to the initial request?

 

Cheers, Simon

 

2 Replies

  • Hello Simon,

     

    Check the "HTTP 401 Response" action. It will be useful in your case and you won't need to use an irule to make the 401 response.

     

    https://support.f5.com/kb/en-us/products/big-ip_apm/manuals/product/apm-visual-policy-editor-12-1-0/5.html

     

    Your VPE will look like this "HTTP 401 Response" + "AD AUTH" + ending allow or deny

     

    From the HTTP 401 Response you can choose which auhtentication protocol you want to in the HTTP 401 Response Header.

     

    Hope it helps

     

    Regards

     

  • Hi,

    Access Policy default behavior is to redirect to /my.policy even if authentication is Basic Auth in VPE.

    you have to use an irule to insert clientless-mode header with value 1

    try this irule with policy logon page - AD Auth - Allow

    when RULE_INIT {
       set static::Basic_Realm_Text "Authentication Required"
    }
    when HTTP_REQUEST {
        if { ! [ info exists SP_PROFILE_RESTRICT_SINGLE_IP ] } {
            set SP_PROFILE_RESTRICT_SINGLE_IP        [PROFILE::access restrict_to_single_client_ip]
        } 
        if { ( [set sessionid [HTTP::cookie value "MRHSession"]] ne "" ) and ( [ACCESS::session exists -state_allow $sessionid] ) } then {
             Allow the successfully pre authenticated request to pass
            return
        } else {
            if { [ string match -nocase {basic *} [HTTP::header Authorization] ] == 1 } {
                set clientless(insert_mode) 1
                set clientless(src_ip)      [IP::remote_addr]
                set clientless(username)    [ string tolower [HTTP::username] ]
                set clientless(password)    [HTTP::password]
                if { $SP_PROFILE_RESTRICT_SINGLE_IP == 0 } {
                    binary scan [md5 "$clientless(password)"] H* clientless(hash)
                } else {
                    binary scan [md5 "$clientless(password)$clientless(src_ip)"] H* clientless(hash)
                }
                set user_key "$clientless(username).$clientless(hash)"
                set clientless(cookie_list)             [ ACCESS::user getsid $user_key ]
                if { [ llength $clientless(cookie_list) ] != 0 } {
                   set clientless(cookie) [ ACCESS::user getkey [ lindex $clientless(cookie_list) 0 ] ]
                   if { $clientless(cookie) != "" } {
                      HTTP::cookie insert name MRHSession value $clientless(cookie)
                      set clientless(insert_mode) 0
                   }
               }
               if { $clientless(insert_mode) } {
                   HTTP::header insert "clientless-mode" 1
               }
            }
        }
    }
    
    when ACCESS_SESSION_STARTED {
        if { [info exists user_key] } then {
            ACCESS::session data set {session.user.uuid} $user_key
        }        
        if { [info exists clientless] } then {        
             ACCESS::session data set {session.logon.last.username} $clientless(username)             
             ACCESS::session data set -secure {session.logon.last.password} $clientless(password)   
        }
    }
    
    
    when ACCESS_POLICY_COMPLETED {
        if { ([info exists "clientless_mode"]) && ($clientless_mode) && ([ACCESS::policy result] equals "deny") } {
            ACCESS::respond 401 noserver WWW-Authenticate "Basic realm=\"$static::Basic_Realm_Text\"" Connection close
            ACCESS::session remove
        } 
    }