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Technically, ESP doesn t provide any protection or guarantees about the IP header of the packet This gives hackers a potential point of weakness In practice, a technique called tunneling solves this by wrapping the packet inside of itself Say what It s not as complicated as it sounds If this is a normal packet: [IP header] [TCP header] [data ] then the straightforward use of ESP (called Transport Mode ) would generate the following packet: [IP header] [ESP header] [TCP header] [data ] The parts shown in italics are being protected by ESP If we apply ESP in tunnel mode to the original packet, we get: [IP header] [ESP header] [IP header] [TCP header] [data ] The IP header is used twice once in the beginning of the packet (so that it can get where it s going) and once inside the packet The inner IP header is protected from tampering This can be used to provide a number of different benefits On a basic level, the two IP headers can be compared If different, the packet may have been tampered with Another use is to hide the true source and destination addresses of
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Part VII Hardening Networks 241 a packet The only visible addresses are the IPSec endpoint systems (the VPN device) The IPSec endpoint then uses the internal, encrypted IP header to route the 20 Hardening packet to the correct machine on the internal network
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In an ideal world (from the VPN solution provider s point of view) every supplier, distributor, and customer would connect to the corporate network using VPN hardware and/or software In the real world, this is very expensive and very risky The risk comes from insecure endpoints and compromises due to network incompatibilities Too much access: In many cases, remote users don t need full access to the network Proxies, FTP servers, web mail systems, and other software tools can provide limited access in a much more secure manner The best practices section has some suggestions along these lines Overhyped: VPNs are often sold as security panaceas The vendors focus on the fact that hackers can t see the traffic in transit So what It offers no protection if the hacker can access either end point In fact, it makes it harder to detect a hacker, because they appear to be legitimate users and their hacks are encrypted External intrusion detection systems will not be able to identify hacks conducted over the VPN Multihoming: Many companies use VPNs or dedicated lines to provide access to the corporate network from employees home computers For normal Internet access, the home computer often has a separate modem or broadband connection If both connections are active simultaneously, hackers can gain access to the VPN through the Internet connection through the back door This defeats the entire purpose of the VPN Insecure end point: In most cases a remote end-user s machine can t be trusted If it has any access to the Internet or if software can be installed upon it, then its security may have been compromised A trojan could allow a hacker to gain access to the VPN by stealing the connection settings (passwords, encryption keys, and so on) Or it could queue commands for the next session on the VPN, establishing back doors on the corporate network
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Cryptography: These two concepts are inseparable Really, VPNs are an extension of cryptography Think of VPNs as taking cryptography to the evolved plane of full time, streaming data encryption Digital Certificates: These are frequently used to authenticate each endpoint on a VPN If your network has several users connecting via VPNs, you ll probably want to centrally manage the authentication certificates using a Public Key Infrastructure (PKI)
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242 Network Security Illustrated Remote Access: SSH is a remote access tool that has overlapping functionality with VPNs All other remote access tools should be run either over SSH or a full VPN
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