87 lines
2.9 KiB
Plaintext
87 lines
2.9 KiB
Plaintext
///////////////////////////////////////////////////////////////////
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//
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// Microsoft Research Singularity//
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// Copyright (c) Microsoft Corporation. All rights reserved.
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//
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// File: SdsAcl.sg
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//
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// Note:
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//
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namespace Microsoft.Singularity.Security.SDS
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{
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using System;
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using Microsoft.Contracts;
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using Microsoft.Singularity.Security;
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// This module supports path-based ACLs in the Singularity Directory Service.
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// ACLs are kept in prefix-table adjoining the SDS data structures.
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// This module contains a non-persistent implementation. It can be subclassed to
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// produce a persistent table.
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// An ACL pattern can be null, which matches nothing.
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// However, a null ACL can appear only at the root of the hierarchy, since
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// null elsewhere implies that an ACL pattern should be inherited from a parent.
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// An "effective" acl pattern is one that applies at a given path in the hierarchy.
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// ACLs are <node, descendant> pairs associated with paths.
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// Effective acl patterns are determined as follows:
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// if the node pattern is non-null, return it
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// if this is the root, return null
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// move to the parent in the hierarchy
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// if the descendant pattern is non-null, return it
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// iterate
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public struct Acl
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{
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public static Acl nullAcl = new Acl();
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private readonly string node;
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private readonly string descendant;
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public string Node { get { return node; } }
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public string Descendant { get { return descendant; } }
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public Acl(string val)
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{
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this.node = val;
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this.descendant = null;
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}
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public Acl(string val1, string val2)
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{
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this.node = val1;
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this.descendant = val2;
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}
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}
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public interface IEffectiveAclRef {
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// if GetCached returns false, the IEffectiveAclRef is invalid:
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// call ISdsAcl::GetEffective to get a new one
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bool GetCached (out string aclPattern);
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}
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public interface ISdsAcl
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{
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//
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//All "path" variables here must start with "/", end with other than "/" (except for the
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//root), and contain no repeated "/" characters.
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//
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// This method gets the effective acl for the argument path node.
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// Effective ACLs are computed by tracing up to an non-null descendant ACL.
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// Effective ACLs always have a null inherited component.
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string GetEffective(string! path, out IEffectiveAclRef aclRef);
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// This method gets the ACL stored for the designated path (e.g. not inherited)
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Acl Get(string! path);
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// This method sets an ACL for a path and the paths that inherit from it.
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void Set(string! path, Acl acl);
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// This method clears an ACL associated with a path;
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void Clear(string! path);
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}
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}
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