Custom Authentication Provider

[John Beschler]

Here's the scenario.

Using Web.Sitemap with GenericSiteMapProvider for application menu.

Need to secure menu options by user;

using client certificates for authentication

Capture SubjectCN from cleintCertificate and validate against SQL database
for application permissions.

Is there a simple way to override the IIDentity and/or custom Principal so
that I can implement Security Thinning on the menus?

Or, if it would be easier, I would be willing to overwride the sitemap
provider and add a node to the sitemap xml that I can use to validate
security.

Thanks,

John