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Remote Access VPN Components and Design Points |
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have a large number of them on your network. Instead, create separate global groups that are members of the universal group, and add users to those global groups.
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Design Point: AAA Infrastructure
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Consider the following when configuring the AAA infrastructure for remote access VPN connections:
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If you have multiple VPN servers and you want to centralize AAA service or
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a heterogeneous mixture of dial-up and VPN equipment, use a RADIUS server and configure the VPN server for the RADIUS authentication and accounting providers. Using IAS on Windows Server 2003 as the RADIUS server will also allow for SQL-XML logging to handle central analysis and monitoring of the AAA logs.
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If your user account database is a Windows domain, use IAS as your
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RADIUS server. If you use IAS, install IAS on a domain controller for best performance. Install at least two IAS servers for fail-over and fault tolerance of AAA services.
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Whether you configure them locally or on an IAS server, use remote access
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policies to authorize VPN connections and specify connection constraints. For example, use remote access policies to grant access based on group membership, to enforce the use of encryption and a specific encryption strength, to specify the use of EAP-TLS, or to limit traffic using IP packet filtering.
To prevent VPN clients from forwarding routed traffic, configure remote
access policy-profile packet filters to discard all traffic on VPN connections except traffic to and from VPN clients. Also, use quarantine features to check for routing enablement on the clients and to turn off the routing on the cli ents prior to granting access to the network.
For a large Active Directory domain, nest global groups within universal
groups to manage access based on group membership.
Sensitive fields of RADIUS messages, such as the user password and encryp
tion keys, are encrypted with the RADIUS shared secret configured on the VPN server and the RADIUS server. Make the shared secret a long (22 char acters or longer), random sequence of letters, numbers, and symbols. An example of a strong shared secret is 8d#>9fq4bV)H7%a3^jfDe2. To further protect RADIUS traffic, use Windows Server 2003 IPSec policies to provide data confidentiality for all traffic using the RADIUS UDP destination ports (1812 and 1645 for RADIUS authentication traffic, and 1813 and 1646 for RADIUS accounting traffic).
PART II
VPN Deployment
Certificate Infrastructure
To perform certificate-based authentication for L2TP connections and smart card or user certificate based authentication for VPN connections using EAP-TLS, a certifi cate infrastructure, also known as a public key infrastructure (PKI), must be in place to issue the proper certificates to submit during the authentication process and to validate the certificate being submitted.
Computer Certificates for L2TP/IPSec
When you are using the certificate authentication method for L2TP/IPSec connec tions, the list of CAs is not configurable. Instead, each computer in the L2TP/IPSec connection sends a list of root CAs to its IPSec peer, from which it accepts a certifi cate for authentication. The root CAs in this list correspond to the root CAs that issued computer certificates to the computer. For example, if Computer A was issued computer certificates by root CAs CertAuth1 and CertAuth2, it notifies its IPSec peer during main mode negotiation that it will accept certificates for authenti cation from only CertAuth1 and CertAuth2. If the IPSec peer, Computer B, does not have a valid computer certificate issued from either CertAuth1 or CertAuth2, IPSec security negotiation fails. The VPN client must have a valid computer certificate installed that was issued by a CA that follows a valid certificate chain from the issuing CA up to a root CA that the VPN server trusts. Additionally, the VPN server must have a valid computer certifi cate installed that was issued by a CA that follows a valid certificate chain from the issuing CA up to a root CA that the VPN client trusts. For example, if the VPN client was issued computer certificates by root CAs CertAuth1 and CertAuth2, it notifies the VPN server during IPSec security negotia tion that it will accept certificates for authentication from only CertAuth1 and CertAuth2. If the VPN server does not have a valid computer certificate issued from a CA that follows a certificate chain to either CertAuth1 or CertAuth2, IPSec security negotiation fails. A single CA commonly issues computer certificates to all computers in an organiza tion. Because of this, all computers within the organization have computer certifi cates from a single CA, and they request certificates for authentication from the same single CA. Deploying computer certificates in your organization consists of the following pro cedures: 1. Deploy a certificate infrastructure. For more information, see Appendix C. 2. Install a computer certificate on each computer. For more information, see 6.
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