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Robust Certificate Checking for VPN Connections
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RRAS supports more rigorous certificate checking to help block man-in-the-middle attacks. The additional analysis by the VPN client includes verifying that the Subject or Subject Alternative Name fields of the VPN server s certificate match the name or IP address of the VPN server as defined for the VPN connection. You can disable this additional certificate checking on the VPN client as follows: Open the Properties dialog box for the connection, click the Networking tab, click IPsec Settings, and then clear the Verify The Name And Usage Attributes Of The Server s Certificate check box, as shown in Figure 5-10.
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Figure 5-10 Disabling rigorous certificate checking for a VPN connection.
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This section starts with a quick refresher on the basics of IPsec, then spends more time discussing the new capabilities relating to IPsec in Windows Server 2008, and finally shows you how to use the technology to isolate servers and domains, a foundation for your NAP architecture.
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IPsec is an open standard used to protect information transiting networks from unauthorized access and modification. This is done using a combination of authentication protocols, data
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encryption, and digital signatures. When two hosts begin to use IPsec to communicate they initially establish two security associations. In phase one or main mode, the hosts authenticate with one another; in phase two or quick mode, the hosts negotiate what protocols they will use to digitally sign or encrypt network traffic. Each packet can be signed to let the receiving host be certain that it came from the trusted host and that it has not been altered in any way. Each packet can be encrypted to protect the data from being accessed by anything other than the receiving host. You can configure IPsec rules to implement either or both of these forms of protection.
IPsec Authentication
Security associations are negotiated using the Internet Key Exchange (IKE) protocol, which itself consists of three other protocols: ISAKMP, Oakley, and SKEME. Via IKE, the two hosts agree how authentication messages will be constructed and exchanged. (The complete details are quite complex and beyond the scope of this chapter.) The hosts can authenticate using a number of methods, including the following:
Kerberos version 5 If both hosts are in the same Active Directory forest, they can use Kerberos for mutual authentication. Kerberos is ideal when you do not have a public key infrastructure (PKI) and trusts do not have to be established with hosts outside of your forest. Digital certificates If the hosts have access to a robust PKI, digital certificates may be the ideal authentication method. Windows XP and later versions of the Microsoft operating system support automated distribution of computer certificates, which overcomes one of the biggest challenges of managing a large PKI: distributing certificates. As long as each host has a certificate signed by a Certificate Authority (CA) trusted by the other, they will authenticate to one another. Preshared keys Support for preshared keys is only included for conformance with the IPsec standard. The only time using this method might make sense is when you are developing and testing your IPsec policies. Every host that is part of the policy will need to have the same key. Just as having multiple users share the same password is a bad idea, having multiple computers share the same key for authentication is poor practice.
New authentication capabilities in Windows Server 2008 are described later in this section.
IPsec Communication Modes
IPsec communication happens in one of two modes: Transport mode or Tunnel mode. Transport mode is appropriate when you want to have multiple computers use IPsec with each other. In this mode the two hosts authenticate with one another in phase one, and then agree on traffic signing and encryption procedures. Although it may seem to be the opposite of what you expected, this is the mode used for L2TP VPNs between the remote client and the VPN server.
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