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APM: Variable Assign

Variable assign best practice

Username / Domain Management

get username

image-1615964871694.png

session.logon.last.username

extract CN from certificate subject and set it in username variable

set subject [split [mcget {session.ssl.cert.subject}] ",="]; 
foreach {name value} $subject {
    if {[string trim $name] equals "CN"} { 
        return [string trim $value]; 
    } 
}
session.logon.last.username

combine username and domain variables

expr { "[mcget {session.logon.last.domain}]\\[mcget {session.logon.last.username}]" }
session.logon.last.ntdomain

extract NT domain name from logon name

if { [mcget {session.logon.last.username}] contains "\\" } { 
    set username [string tolower [mcget {session.logon.last.logonname}]];  
    return [string range $username 0 [expr {[string first "\\" $username] -1}] ];  
} else {  
    return {}  
}

one-line code

expr {[set username [string tolower [mcget {session.logon.last.logonname}]]] contains "\\" ? [string range $username 0 [expr {[string first "\\" $username] -1}] ] : "" }
session.logon.last.domain

static assignment from ntdomain

switch [string tolower [mcget {session.logon.last.ntdomain}]] { 
    "domain1" { return "domain1.local" } 
    "domain2" { return "domain2.local" }  
    default { return "default.local" } 
}
session.logon.last.username

Extract username name from logonname (full username from logon page even if split domain from username is checked)

set username [string trim [mcget {session.logon.last.logonname}]];
if { $username contains "\\" } {
     return [string range $username [expr {[string first "\\" $username] +1}] end ];
} else { return $username }
session.logon.last.upn

Extract UPN value from Certificate X509Extension

set extension [string tolower [mcget {session.ssl.cert.x509extension}]];  
return [string range $extension [expr {[string first "othername:upn<" $extension] +14}] [expr {[string last ">" $extension] -1}] ];

Session / Timeout Management

session.inactivity_timeout

Change inactivity session timeout based on a checkbox on the logon page (logon variable trusted)

if { [mcget {session.logon.last.trusted}] == 1 } { return {5400} } else { return {1800} }

one-line code (5400 seconds if condition before ? success, 1800 seconds else)

expr { [mcget {session.logon.last.trusted}] == 1 ? {5400} : {1800}}
session.inactivity_timeout

Change inactivity session timeout based on client type (iOS, Android and WindowsPhone : half of inactivity timeout configured in profile parameters)

expr { [mcget {session.client.platform}] == "WindowsPhone" || [mcget {session.client.platform}] == "Android" || [mcget {session.client.platform}] == "iOS" ? [mcget {session.inactivity_timeout}]/2 : [mcget {session.inactivity_timeout}] }
session.max_session_timeout

force to close the session à 17:00

expr { [clock scan "17:00"] - [mcget {session.user.starttime}] }
session.max_session_timeout

After a AD query which retreive attribute logonHours, force to close the session when user at the end of allowed logon hours

set maximumSessionSeconds 604800
if {[set logonHours [mcget {session.ad.last.attr.logonHours}]] != "" && $logonHours != "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF"} {
    #convert string to binary string
    binary scan [binary format H* $logonHours] b* logon_hours_binary_string
    # evaluate the number of seconds from last sunday
    set time_from_sunday [expr {[clock seconds] - [clock scan "last sunday"]}];
    # search in string next hours with 0 value
    set current_index [expr {$time_from_sunday / 3600}];
    # convert the index to number of seconds from last sunday
    if {[set next_denied_index [string first 0 $logon_hours_binary_string$logon_hours_binary_string $current_index]] == $current_index } {return 0}
    # evaluate number on seconds to disconnect time
    return [expr { $next_denied_index*3600 - $time_from_sunday}]
} else { return $maximumSessionSeconds}

Windows Info

session.windows_info_os.last.fqdn

search and return FQDN hostname in computer names list after windows Info Box

foreach x [split [mcget {session.windows_info_os.last.computer}] "|"] {
    if { $x ends_with ".f5demo.lab" } {
        return $x
    }
}

session.windows_info_os.last.computer_name

search FQDN hostname in computer names list after windows Info Box, then return shortname (without domain name)

foreach x [split [mcget {session.windows_info_os.last.computer}] "|"] {
    if { $x ends_with ".f5demo.lab" } {
        return [lindex [split $x "."] 0]
    }
}

Machine Cert

To allow machine certificate revocation validation, add a variable assign with 2 following variables before OCSP or CRLDP boxes.

session.ssl.cert.whole

store machine certificate as it was user certificate

expr {[mcget {session.check_machinecert.last.cert.cert}]}
session.ssl.cert.certissuer

store machine certificate issuer as it was user certificate issuer

expr {[mcget {session.check_machinecert.last.cert.issuer}]}

HTTP auth returned cookie parsing

session.custom.http_auth_mycookie

extract from HTTP auth cookie list the cookie value of mycookie

expr { [lindex [regexp -inline {mycookie=([^;\\\r]*)} [mcget session.http.last.response_cookie]] 1] }
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