Getting Information From an ACL - Win32 Programmer's Reference

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Getting Information From an ACL

Windows NT version 4.0 provides several functions for retrieving access-control information from an ACL. These include functions for determining the access rights that an ACL grants or audits for a specified trustee. A trustee can be a user account, group account, or a logon account for a program such as a Windows NT service. Other functions enable you to extract ACE information from an ACL.

The GetEffectiveRightsFromAcl function enables you to determine the effective access rights that a DACL grants to a specified trustee. The trustee's effective access rights are the access rights that the ACL grants to the trustee or to any groups of which the trustee is a member. GetEffectiveRightsFromAcl checks all access-allowed and access-denied ACEs in the ACL to determine the effective rights for the trustee.

The GetAuditedPermissionsFromAcl function enables you to check a SACL to determine the audited access rights for a specified trustee. The audited rights indicate the types of access attempts that cause the system to generate an audit record in the system event log. The function returns two access masks: one containing the access rights monitored for failed access attempts, and another containing the access rights monitored for successful access. GetAuditedPermissionsFromAcl checks all system-audit ACEs in the ACL. The returned access masks indicate the rights that the ACL audits for the trustee or for any groups of which the trustee is a member.

The GetExplicitEntriesFromAcl function retrieves an array of EXPLICIT_ACCESS structures that describe the ACEs in an ACL. This can be useful when you are copying ACE information from one ACL to another. For example, you can call GetExplicitEntriesFromAcl to get information about the ACEs in one ACL. Then pass the returned EXPLICIT_ACCESS structures in a call to the SetEntriesInAcl function to create equivalent ACEs in the new ACL.

You can use the GetAce function to copy an ACE from an existing ACL. This can be useful if you are using the low-level access control functions to build an ACL. For more information, see Low-Level Access Control Functions.

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