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Hardware Security Module (HSM) and kept in a vault to minimize potential for key compromise.
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Enterprise organizations should not issue certificates to users or computers
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directly from the root CA, but rather should deploy the following:
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An offline root CA Offline intermediate CAs Online issuing Cas
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This CA infrastructure provides flexibility and insulates the root CA and intermediate CAs from attempts by malicious users to compromise its private key. The offline root and intermediate CAs do not have to be Microsoft Win-
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PART IV
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Appendixes
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dows 2000 or Windows Server 2003 CAs. Issuing CAs can be subordinates of a third-party intermediate CA.
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Back up the CA database, the CA certificate, and the CA keys. This is essen
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tial to protect against the loss of critical data. The CA should be backed up on a regular basis (daily, weekly, or monthly), based on the number of cer tificates issued over the same interval. The more certificates issued, the more frequently you should back up the CA.
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Review the concepts of security permissions and access control in Windows,
because enterprise certification authorities issue certificates based on the security permissions of the certificate requester. If you want to take advantage of auto-enrollment for computer certificates and the requesting of certificates using the Certificates snap-in, use Windows 2000 or Win dows Server 2003 Certificate Services and create an enterprise CA at the issuer CA level. For more information, see the Deploying Certificate Infrastructure section in 6, Deploying Remote Access VPNs for a remote access VPN installation, or 9, Deploying Site-to-Site VPNs for a site-to-site installation. If you want to take advantage of auto-enrollment for user certificates by computers running Windows XP or Windows Server 2003, use Windows Server 2003, Enter prise Edition, or Windows Server 2003, Datacenter Edition, Certificate Services and create an enterprise CA at the issuer CA level. For more information, see Deploy ing Certificate Infrastructure in 6 or 9. More Info For more information about certificates and security, see Windows Server 2003 Help And Support, the Microsoft Windows 2000 Security Services Web site at http://www.microsoft.com/windows2000/technologies/security /default.asp, and the Windows Server 2003 Security Services Web site at http: //www.microsoft.com/windowsserver2003/technologies/security/default.mspx.
Certificate Revocation and EAP-TLS Authentication
By default, the authenticating server checks for certificate revocation for all the cer tificates in the certificate chain sent by the VPN client during the EAP-TLS authenti cation process. If certificate revocation fails for any of the certificates in the chain, the connection fails authentication and is rejected. The certificate revocation check for a certificate can fail because of the following reasons:
The certificate has been revoked.
The issuer of the certificate has explicitly revoked the certificate.
The certificate revocation list (CRL) for the certificate is not reachable or
available.
Appendix C
Deploying a Certificate Infrastructure
CAs maintain CRLs and publish them to specific CRL distribution points. The CRL distribution points are included in the CRL Distribution Points field of the certificate. If the CRL distribution points cannot be contacted to check for certificate revocation, the certificate revocation check fails. Additionally, if there are no CRL distribution points in the certificate, the authenticating server cannot verify that the certificate has not been revoked and the certifi cate revocation check fails.
The publisher of the CRL did not issue the certificate.
Included in the CRL is the publishing CA. If the publishing CA of the CRL does not match the issuing CA for the certificate for which certificate revoca tion is being checked, the certificate revocation check fails.
The CRL is not current.
Each published CRL has a range of valid dates. If the CRL Next update date has passed, the CRL is considered invalid and the certificate revocation check fails. New CRLs should be published before the expiration date of the last published CRL. This behavior can be modified using the following registry settings in HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\RasMan\PPP \EAP\13 on the authenticating server:
IgnoreNoRevocationCheck When set to 1, the authenticating server
allows EAP-TLS clients to connect even when it does not perform or cannot complete a revocation check of the client s certificate chain (excluding the root certificate). Typically, revocation checks fail because the certificate doesn t include CRL information. IgnoreNoRevocationCheck is set to 0 (dis abled) by default. An EAP-TLS client cannot connect unless the authenticating server completes a revocation check of the client s certificate chain (including the root certificate) and verifies that none of the certificates have been revoked. You can use this entry to authenticate clients when the certificate does not include CRL distribution points, such as those from third parties.
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