Sophos UTM - SSL VPN & computers identification

Question

Hello folks, I'm trying to improve our SSL VPN security and was asking the following question: Is there a way to identify a remote computer hardware which is connecting to our UTM through SSL VPN? 
 I would like to filter the computers that are connecting through SSL VPN and give permissions in case computers are from our company (with up-to-date OS, limited rights and reliable antivirus solution) and lower permissions for other computers. MAC filtering is not a solution, neither is the STAS (correct me if I'm wrong). I found a workaround through the Client Authentication client but I was wondering if somebody had found another solution. 
 Kind Regards, DeltaSM

DeltaSM · Accepted Answer

Hello, about RADIUS, I have no experience so far (I just know it's linked to authentication). Is it hard to implement? Jaydeep thank for the information about AV, etc. I want to download their package. I can't manage this on my side. 
 So far I have a solution: I use Sophos Authentication Agent on computers I want to authenticate and I enter a common login/password and save it. Of course the users won't know this password. Once connected remotely with their Windows Credential on the VPN, users can access to ressources (or not) through the firewall rules I've configured with these special credentials used in SAA.