Lotus Domino Administrator 8 Help - Precedence rules used to resolve access conflicts at a target

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Precedence rules used to resolve access conflicts at a target
When you select a target in the "Extended Access at: target" dialog box, by default the dialog box shows all the subjects in the extended ACL with access settings to the target. Included are subjects whose access is set at and inherited from a higher target through the scope "This container and all descendants." (You can select "Show Modified" to see only the subjects with access set directly at the target.)

More than one subject that is shown at a selected target can apply to a particular user. For example, a user might be a member of two groups, both of which have access set to the target O=Acme. The following precedence rules are applied to determine the access a user has to a target when there are multiple subjects that apply to the user at the target.

Note Even after precedence rules are applied, a user's access can never exceed the access the database ACL allows the user.

1. Access set for a subject with the scope "This container only" take precedence over access set for a subject with the scope "This container and all descendants" regardless of subject type. For example, the access set for the subject */Acme and the scope "This container only" takes precedence over the access set for the subject Kathy Brown/Acme and the scope "This container and all descendants."

2. Among subjects with the same scope, access for a more-specific type of subject take precedence over access for a less-specific type of subject. The order of subject specificity, from most specific to least specific, is:

Individual user or server
Self
Group
A wildcard, -- for example */Acme
-Default-

For example, the access set for Kathy Brown/Acme with the scope "This container and all descendants" takes precedence over the access set for the group Admins/Acme with the scope "This container and all descendants".

3. When evaluating more than one group subject or more than one wildcard subject, the access settings of the subjects are combined, with Deny access taking precedence over Allow access. For example, if the group Admins/Acme denies Write access and allows all other access, and the group Managers/Acme denies Create access and allows all other access, users that are members of both groups are denied Write and Create access and allowed all other access.

Tip To determine a user's effective access to an extended ACL target after extended access settings and database access are evaluated, select the target in the "Extended Access at target" dialog box, then click Effective Access.

Examples of precedence rules

Subject 1 Subject 2 Combined access (can never exceed the access granted in the database ACL) Rule applied

Subject: */Acme
Scope: "This container and all descendants"
Allow: Read, Browse
Deny: Create, Delete, Write
Subject: */Acme
Scope: "This container only"
Allow: Create, Delete, Write
Deny: Read, Browse
Allow: Create, Delete, Write
Deny: Read, Browse
Rule 1

Subject: Admins/Acme group
Scope: "This container and all descendants."
Allow: All
Subject: */Acme
Scope: "This container and all descendants"
Deny: All
Allow: All Rule 2

Subject: Admins/Acme group
Scope: "This container and all descendants"
Allow: Read, Browse
Deny: Create, Delete, Write
Subject: Managers/Acme group
Scope: "This container and all descendants"
Allow: Create, Delete, Write
Deny: Read, Browse
Deny: All Rule 3

See also

Extended ACL access settings

Elements of an extended ACL

Setting up and managing an extended ACL

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Subject 1	Subject 2	Combined access (can never exceed the access granted in the database ACL)	Rule applied
Subject: */Acme Scope: "This container and all descendants" Allow: Read, Browse Deny: Create, Delete, Write	Subject: */Acme Scope: "This container only" Allow: Create, Delete, Write Deny: Read, Browse	Allow: Create, Delete, Write Deny: Read, Browse	Rule 1
Subject: Admins/Acme group Scope: "This container and all descendants." Allow: All	Subject: */Acme Scope: "This container and all descendants" Deny: All	Allow: All	Rule 2
Subject: Admins/Acme group Scope: "This container and all descendants" Allow: Read, Browse Deny: Create, Delete, Write	Subject: Managers/Acme group Scope: "This container and all descendants" Allow: Create, Delete, Write Deny: Read, Browse	Deny: All	Rule 3