AllowAnonymousAccess, AnonymousState and AnonymousPermMask64 properties for Sharepoint sites with different anonymous configurations

In Sharepoint it is possible to use several anonymous configurations for the sites. They may be changed from Site settings > Site permissions > Anonymous access:

• Entire Web site
• Lists and libraries
• Nothing

Here what description says about them:

Specify what parts of your Web site (if any) anonymous users can access. If you select Entire Web site, anonymous users will be able to view all pages in your Web site and view all lists and items which inherit permissions from the Web site. If you select Lists and libraries, anonymous users will be able to view and change items only for those lists and libraries that have enabled permissions for anonymous users.

And Nothing means that site doesn’t have anonymous access. Depending on used setting Sharepoint changes 3 properties of corresponding SPWeb object: AllowAnonymousAccess, AnonymousState and AnonymousPermMask64. Let’s see how they are changed depending on selection:

1. Anonymous users can access: Entire Web site

Property	Value
AllowAnonymousAccess	True
AnonymousState	On
AnonymousPermMask64	ViewListItems, ViewVersions, ViewFormPages, Open, ViewPages, UseClientIntegration

2. Anonymous users can access: Lists and libraries

Property	Value
AllowAnonymousAccess	False
AnonymousState	Enabled
AnonymousPermMask64	Open

2. Anonymous users can access: Nothing

Property	Value
AllowAnonymousAccess	False
AnonymousState	Disabled
AnonymousPermMask64	EmptyMask