C# CommonSecurityDescriptor.PurgeAccessControl方法代碼示例

        /// <summary>
        /// Builds a session SDDL based on the provided configuration hashtable.
        /// Retrieves RequiredGroups information to add conditional group membership restrictions to SDDL.
        /// Retrieves RoleDefinitions information to include role user accounts.
        /// </summary>
        /// <param name="configTable"></param>
        /// <param name="accessMode"></param>
        /// <param name="error"></param>
        /// <returns>SDDL</returns>
        internal static string ComputeSDDLFromConfiguration(
            Hashtable configTable,
            PSSessionConfigurationAccessMode accessMode,
            out ErrorRecord error)
        {
            Dbg.Assert(configTable != null, "configTable input parameter cannot be null.");

            string sddl = string.Empty;
            error = null;

            // RoleDefinitions
            if (configTable.ContainsKey(ConfigFileConstants.RoleDefinitions))
            {
                // Start with known good security descriptor.
                if (accessMode == PSSessionConfigurationAccessMode.Local)
                {
                    sddl = PSSessionConfigurationCommandBase.GetLocalSddl();
                }
                else if (accessMode == PSSessionConfigurationAccessMode.Remote)
                {
                    sddl = PSSessionConfigurationCommandBase.GetRemoteSddl();
                }
                CommonSecurityDescriptor descriptor = new CommonSecurityDescriptor(false, false, sddl);

                // Purge all existing access rules so that only role definition principals are granted access.
                List<SecurityIdentifier> sidsToRemove = new List<SecurityIdentifier>();
                foreach (CommonAce ace in descriptor.DiscretionaryAcl)
                {
                    sidsToRemove.Add(ace.SecurityIdentifier);
                }
                foreach (var sidToRemove in sidsToRemove)
                {
                    descriptor.PurgeAccessControl(sidToRemove);
                }

                Hashtable roleNamesHash = configTable[ConfigFileConstants.RoleDefinitions] as Hashtable;
                foreach (object roleName in roleNamesHash.Keys)
                {
                    string roleNameValue = roleName.ToString();

                    try
                    {
                        NTAccount ntAccount = new NTAccount(roleNameValue);
                        SecurityIdentifier accountSid = (SecurityIdentifier)ntAccount.Translate(typeof(SecurityIdentifier));
                        // AccessMask = 268435456 == 0x10000000 == GR == Generic Read
                        descriptor.DiscretionaryAcl.AddAccess(AccessControlType.Allow, accountSid, 268435456, InheritanceFlags.None, PropagationFlags.None);
                    }
                    catch (IdentityNotMappedException e)
                    {
                        string message = StringUtil.Format(RemotingErrorIdStrings.CouldNotResolveRoleDefinitionPrincipal, roleNameValue, e.Message);
                        InvalidOperationException ioe = new InvalidOperationException(message, e);
                        error = new ErrorRecord(ioe, "CouldNotResolveRoleDefinitionPrincipal", ErrorCategory.ObjectNotFound, roleNameValue);
                    }
                }

                if (descriptor.DiscretionaryAcl.Count > 0)
                {
                    sddl = descriptor.GetSddlForm(AccessControlSections.All);

                    // RequiredGroups
                    string conditionalGroupACE = CreateConditionalACEFromConfig(configTable);
                    if (conditionalGroupACE != null)
                    {
                        sddl = UpdateSDDLUsersWithGroupConditional(sddl, conditionalGroupACE);
                    }
                }
            }

            return sddl;
        }

		public void PurgeDefaultDacl ()
		{
			SecurityIdentifier userSid = new SecurityIdentifier ("SY");
			SecurityIdentifier groupSid = new SecurityIdentifier ("BA");
			SecurityIdentifier everyoneSid = new SecurityIdentifier ("WD");

			CommonSecurityDescriptor csd = new CommonSecurityDescriptor
				(false, false, ControlFlags.None, userSid, groupSid, null, null);

			DiscretionaryAcl dacl = csd.DiscretionaryAcl;
			Assert.AreEqual (1, dacl.Count);

			csd.PurgeAccessControl (userSid);
			Assert.AreEqual (1, dacl.Count);

			csd.PurgeAccessControl (everyoneSid);
			Assert.AreEqual (0, dacl.Count);
		}