SSL VPN Virtual Private Networks based on Secure Socket Layer
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1 SSL VPN Virtual Private Networks based on Secure Socket Layer Mario Baldi Politecnico di Torino (Technical Univesity of Turin)
2 SSL VPN: What is that? SSL as the central mechanism on which to base secure access Site-to-site VPN Remote access VPN Secure service access Loose interpretation of VPN SSL (pseudo)vpn Tunneling based on TCP or UDP SSL-VPN - 2
3 Why Not IPsec VPN? IPsec too difficult and/or too expensive to use securely Too many options to be configured and administered Operates in kernel space Failures potentially catastrophic Installation difficult and risky Concerns fade with maturity SSL-VPN - 3
4 Why SSL VPN Lower complexity Installation Configuration Management Non-interference with kernel Most widely used SSL-VPN - 4 Higher, more robust security
5 Compared to IPsec VPN No problem with NAT traversal No authentication of IP header ESP (encapsulation securty payload) IPsec to be used Packets dropped at a higher level Critical with DOS attacks SSL-VPN - 5
6 Compared to PPTP Initially proprietary (Microsoft) Initially weak security Fixed later Poor interoperability with non- Microsoft platforms GRE (generic routing encapsulation) tunneling Possibly blocked by routers SSL-VPN - 6
7 SSL (pseudo)vpn IPsec VPNs connect networks Or hosts to networks SSL VPNs connect Users to services Application clients to application servers SSL-VPN - 7
8 Why SSL (pseudo)vpn No client code is to be installed Usable anywhere (kyosk) Applications available through web browser Deploying HTTPS Not a general security solution Specific solutions suitable to selected applications SSL-VPN - 8
9 In Summary SSL VPNs have a good chance of working on any network scenario TCP or UDP tunneling enable NAT traversal Firewall traversal Router traversal SSL (pseudo)vpn enable universal client (web browser) SSL-VPN - 9
10 SSL VPN Flavors Web proxying Application translation Port forwarding SSL ed protocols Application proxying Network extension Site-to-site connectivity Pseudo VPN SSL-VPN - 10
11 Proxying VPN Gateway downloads web pages through HTTP Ship them through HTTPS Web server HTTPS HTTP Client VPN Gateway SSL-VPN - 11
12 Application Translation Native protocol between VPN server and application server E.g., FTP, STMP, POP Application user interface as a web page HTTP(S) between VPN server and client Not suitable for all applications Look&feel might be lost SSL-VPN - 12
13 Application Translation HTTPS POP3 Mail server SSL-VPN - 13
14 Port Forwarding SSL/HTTPS POP3 POP3 (TCP port 110) Port Forwarder TCP port 443 HTTPS SSL-VPN - 14
15 Port Forwarding SSL/HTTPS POP3 TCP port 443 HTTPS TCP port 110 POP3 Port Forwarding SSL-VPN - 15
16 Port Forwarding Works only with fixed port protocols Problems with address and port in application layer protocol SSL-VPN gateway must know application protocol to translate Application layer gateway (ALG) SSL-VPN - 16
17 SSL ed Protocols Secure application protocols Protocol-over-SSL E.g., POP-over-SSL, IMAPover-SSL, SMTP-over-SSL Client and server support required POP-over-SSL TCP port 995 SSL-VPN - 17
18 Application Proxying Compatibility with older servers Client points at SSL-VPN gateway TCP port 995 TCP port 110 POP-o-SSL POP3 SSL-VPN - 18
19 Network Extension Tunnel over SSL POP3 Tunnel over SSL POP3 FTP FTP SSL-VPN - 19
20 Products and Vendors SSL-VPN - 20 Open VPN (openvpn.net) AEP F5 Networks NetScreen Technologies Netilla Nokia Symantec Whale Communications
21 Main Issues Interoperability Product specific features Implementation weaknesses Availability of client on specific platforms SSL-VPN - 21
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