VPNs and Related Services in .NET

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Very close to the policy are the domains of trust Is the service provider trusted The end user Sites When the VPN provider is responsible for security functions, there still needs to be a distinction between edge and core requirements and functions It will be quite common for providers to implement dial-up and other end user access control mechanisms, and the provider might also furnish security services for sites and servers (for example, IPSec tunnels among firewalls)
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Where to Implement Security Mechanisms
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Clear distinctions must be made for the responsibility and positioning of security mechanisms Some security mechanisms, such as IPSec transport mode, are host-oriented and will normally be transparent to VPN providers In particular situations, the maintenance of such mechanisms might be outsourced to the provider organization, but such maintenance will often require a different skill set (that is, host and LAN operating system administration) than general VPN support The user organization has final responsibility for the legal and management aspects of the security policy In some cases, the policy may preclude outsourcing certain security functions, in that outside organizations are not trusted to manage these functions Security is not encryption alone In VPNs, security must consider the authentication of changes that could create a tunnel that might leak data Virtual routers and virtual routing instances, by their basic architecture, do isolate different VPNs As soon as the capability to have an extranet, or to have Internet access, is added to the VPN capability, there are more chances to leak data
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The most basic question is whether the customer trusts the provider When the customer does not trust the provider to secure content, the role of the provider becomes one restricted to packet transport Encryption and authentication are customer responsibilities In Figure 138, the customer uses the VPN for security between hosts, not trusting intermediate security gateways Figure 139
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A SIDE NOTE ON IPSec The existing IPSec specification assumes that a security association (SA) will use authentication, encryption, or both It does not assume one would use IPSec with neither capability, but the capability of doing so may actually be useful in some VPN applications IPSec supports multiplexing and tunneling, which may be all that is needed for some VPNs, and it is certainly easier to modify a protocol to turn off existing features than to add new functionality
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Figure 138 Customer security
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shows a typical application in the financial industry, where separate X317 encryptors are well-established The tunnel need provide no security Trusting the provider may be more subtle than it would first appear The customer might very well not trust the provider to do the actual encryption, but might be willing to use a public key infrastructure (PKI) certification authority (CA) operated by the provider CA operation can be quite complex logistically, yet having a third-party CA does not necessarily compromise the security of user traffic as long as the user maintains the secrecy of private keys
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Over the years, I have never failed to be amused when customers begin to worry about the security of frame relay and ATM because they share facilities with other customers At such times, I m often tempted to ask them to pull on their dedicated line in Chicago and ask the Dallas office whether the other end moved The information on the dedicated line, of course, becomes a multiplexed channel on shared facilities once it leaves the telephone end office A VPN that runs completely over carrier facilities has comparable security to frame relay or ATM If the data carried is sufficiently sensitive that it would be reasonable to encrypt it on a dedicated line, then it is reasonable to encrypt it on a VPN If the customer has an unshakable perception that IP isn t secure, it may be a practical necessity to encrypt In most cases, the best place to encrypt is at the CPE/CLE or in devices in the customer network before it connects to the CPE/CLE By doing so, the traffic is protected in the local loop, where it is generally most vulnerable to wiretaps Once beyond the local loop, the inherent
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