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FileSystemSecurity Class

Represents the access control and audit security for a file or directory.

Namespace:  System.Security.AccessControl
Assembly:  mscorlib (in mscorlib.dll)

public abstract class FileSystemSecurity : NativeObjectSecurity

The FileSystemSecurity type exposes the following members.

  NameDescription
Public propertyAccessRightTypeGets the enumeration that the FileSystemSecurity class uses to represent access rights. (Overrides ObjectSecurity.AccessRightType.)
Protected propertyAccessRulesModifiedGets or sets a Boolean value that specifies whether the access rules associated with this ObjectSecurity object have been modified. (Inherited from ObjectSecurity.)
Public propertyAccessRuleTypeGets the enumeration that the FileSystemSecurity class uses to represent access rules. (Overrides ObjectSecurity.AccessRuleType.)
Public propertyAreAccessRulesCanonicalGets a Boolean value that specifies whether the access rules associated with this ObjectSecurity object are in canonical order. (Inherited from ObjectSecurity.)
Public propertyAreAccessRulesProtectedGets a Boolean value that specifies whether the Discretionary Access Control List (DACL) associated with this ObjectSecurity object is protected. (Inherited from ObjectSecurity.)
Public propertyAreAuditRulesCanonicalGets a Boolean value that specifies whether the audit rules associated with this ObjectSecurity object are in canonical order. (Inherited from ObjectSecurity.)
Public propertyAreAuditRulesProtectedGets a Boolean value that specifies whether the System Access Control List (SACL) associated with this ObjectSecurity object is protected. (Inherited from ObjectSecurity.)
Protected propertyAuditRulesModifiedGets or sets a Boolean value that specifies whether the audit rules associated with this ObjectSecurity object have been modified. (Inherited from ObjectSecurity.)
Public propertyAuditRuleTypeGets the type that the FileSystemSecurity class uses to represent audit rules. (Overrides ObjectSecurity.AuditRuleType.)
Protected propertyGroupModifiedGets or sets a Boolean value that specifies whether the group associated with the securable object has been modified. (Inherited from ObjectSecurity.)
Protected propertyIsContainerGets a Boolean value that specifies whether this ObjectSecurity object is a container object. (Inherited from ObjectSecurity.)
Protected propertyIsDSGets a Boolean value that specifies whether this ObjectSecurity object is a directory object. (Inherited from ObjectSecurity.)
Protected propertyOwnerModifiedGets or sets a Boolean value that specifies whether the owner of the securable object has been modified. (Inherited from ObjectSecurity.)
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  NameDescription
Public methodAccessRuleFactoryInitializes a new instance of the FileSystemAccessRule class that represents a new access control rule for the specified user, with the specified access rights, access control, and flags. (Overrides ObjectSecurity.AccessRuleFactory(IdentityReference, Int32, Boolean, InheritanceFlags, PropagationFlags, AccessControlType).)
Protected methodAddAccessRule(AccessRule)Adds the specified access rule to the Discretionary Access Control List (DACL) associated with this CommonObjectSecurity object. (Inherited from CommonObjectSecurity.)
Public methodAddAccessRule(FileSystemAccessRule)Adds the specified access control list (ACL) permission to the current file or directory.
Protected methodAddAuditRule(AuditRule)Adds the specified audit rule to the System Access Control List (SACL) associated with this CommonObjectSecurity object. (Inherited from CommonObjectSecurity.)
Public methodAddAuditRule(FileSystemAuditRule)Adds the specified audit rule to the current file or directory.
Public methodAuditRuleFactoryInitializes a new instance of the FileSystemAuditRule class representing the specified audit rule for the specified user. (Overrides ObjectSecurity.AuditRuleFactory(IdentityReference, Int32, Boolean, InheritanceFlags, PropagationFlags, AuditFlags).)
Public methodEquals(Object)Determines whether the specified object is equal to the current object. (Inherited from Object.)
Protected methodFinalizeAllows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
Public methodGetAccessRulesGets a collection of the access rules associated with the specified security identifier. (Inherited from CommonObjectSecurity.)
Public methodGetAuditRulesGets a collection of the audit rules associated with the specified security identifier. (Inherited from CommonObjectSecurity.)
Public methodGetGroupGets the primary group associated with the specified owner. (Inherited from ObjectSecurity.)
Public methodGetHashCodeServes as the default hash function. (Inherited from Object.)
Public methodGetOwnerGets the owner associated with the specified primary group. (Inherited from ObjectSecurity.)
Public methodGetSecurityDescriptorBinaryFormReturns an array of byte values that represents the security descriptor information for this ObjectSecurity object. (Inherited from ObjectSecurity.)
Public methodGetSecurityDescriptorSddlFormReturns the Security Descriptor Definition Language (SDDL) representation of the specified sections of the security descriptor associated with this ObjectSecurity object. (Inherited from ObjectSecurity.)
Public methodGetTypeGets the Type of the current instance. (Inherited from Object.)
Protected methodMemberwiseCloneCreates a shallow copy of the current Object. (Inherited from Object.)
Protected methodModifyAccessApplies the specified modification to the Discretionary Access Control List (DACL) associated with this CommonObjectSecurity object. (Inherited from CommonObjectSecurity.)
Public methodModifyAccessRuleApplies the specified modification to the Discretionary Access Control List (DACL) associated with this ObjectSecurity object. (Inherited from ObjectSecurity.)
Protected methodModifyAuditApplies the specified modification to the System Access Control List (SACL) associated with this CommonObjectSecurity object. (Inherited from CommonObjectSecurity.)
Public methodModifyAuditRuleApplies the specified modification to the System Access Control List (SACL) associated with this ObjectSecurity object. (Inherited from ObjectSecurity.)
Protected methodPersist(SafeHandle, AccessControlSections)Saves the specified sections of the security descriptor associated with this NativeObjectSecurity object to permanent storage. We recommend that the values of the includeSections parameters passed to the constructor and persist methods be identical. For more information, see Remarks. (Inherited from NativeObjectSecurity.)
Protected methodPersist(String, AccessControlSections)Saves the specified sections of the security descriptor associated with this NativeObjectSecurity object to permanent storage. We recommend that the values of the includeSections parameters passed to the constructor and persist methods be identical. For more information, see Remarks. (Inherited from NativeObjectSecurity.)
Protected methodPersist(Boolean, String, AccessControlSections)Saves the specified sections of the security descriptor associated with this ObjectSecurity object to permanent storage. We recommend that the values of the includeSections parameters passed to the constructor and persist methods be identical. For more information, see Remarks. (Inherited from ObjectSecurity.)
Protected methodPersist(SafeHandle, AccessControlSections, Object)Saves the specified sections of the security descriptor associated with this NativeObjectSecurity object to permanent storage. We recommend that the values of the includeSections parameters passed to the constructor and persist methods be identical. For more information, see Remarks. (Inherited from NativeObjectSecurity.)
Protected methodPersist(String, AccessControlSections, Object)Saves the specified sections of the security descriptor associated with this NativeObjectSecurity object to permanent storage. We recommend that the values of the includeSections parameters passed to the constructor and persist methods be identical. For more information, see Remarks. (Inherited from NativeObjectSecurity.)
Public methodPurgeAccessRulesRemoves all access rules associated with the specified IdentityReference. (Inherited from ObjectSecurity.)
Public methodPurgeAuditRulesRemoves all audit rules associated with the specified IdentityReference. (Inherited from ObjectSecurity.)
Protected methodReadLockLocks this ObjectSecurity object for read access. (Inherited from ObjectSecurity.)
Protected methodReadUnlockUnlocks this ObjectSecurity object for read access. (Inherited from ObjectSecurity.)
Protected methodRemoveAccessRule(AccessRule)Removes access rules that contain the same security identifier and access mask as the specified access rule from the Discretionary Access Control List (DACL) associated with this CommonObjectSecurity object. (Inherited from CommonObjectSecurity.)
Public methodRemoveAccessRule(FileSystemAccessRule)Removes all matching allow or deny access control list (ACL) permissions from the current file or directory.
Protected methodRemoveAccessRuleAll(AccessRule)Removes all access rules that have the same security identifier as the specified access rule from the Discretionary Access Control List (DACL) associated with this CommonObjectSecurity object. (Inherited from CommonObjectSecurity.)
Public methodRemoveAccessRuleAll(FileSystemAccessRule)Removes all access control list (ACL) permissions for the specified user from the current file or directory.
Protected methodRemoveAccessRuleSpecific(AccessRule)Removes all access rules that exactly match the specified access rule from the Discretionary Access Control List (DACL) associated with this CommonObjectSecurity object. (Inherited from CommonObjectSecurity.)
Public methodRemoveAccessRuleSpecific(FileSystemAccessRule)Removes a single matching allow or deny access control list (ACL) permission from the current file or directory.
Protected methodRemoveAuditRule(AuditRule)Removes audit rules that contain the same security identifier and access mask as the specified audit rule from the System Access Control List (SACL) associated with this CommonObjectSecurity object. (Inherited from CommonObjectSecurity.)
Public methodRemoveAuditRule(FileSystemAuditRule)Removes all matching allow or deny audit rules from the current file or directory.
Protected methodRemoveAuditRuleAll(AuditRule)Removes all audit rules that have the same security identifier as the specified audit rule from the System Access Control List (SACL) associated with this CommonObjectSecurity object. (Inherited from CommonObjectSecurity.)
Public methodRemoveAuditRuleAll(FileSystemAuditRule)Removes all audit rules for the specified user from the current file or directory.
Protected methodRemoveAuditRuleSpecific(AuditRule)Removes all audit rules that exactly match the specified audit rule from the System Access Control List (SACL) associated with this CommonObjectSecurity object. (Inherited from CommonObjectSecurity.)
Public methodRemoveAuditRuleSpecific(FileSystemAuditRule)Removes a single matching allow or deny audit rule from the current file or directory.
Protected methodResetAccessRule(AccessRule)Removes all access rules in the Discretionary Access Control List (DACL) associated with this CommonObjectSecurity object and then adds the specified access rule. (Inherited from CommonObjectSecurity.)
Public methodResetAccessRule(FileSystemAccessRule)Adds the specified access control list (ACL) permission to the current file or directory and removes all matching ACL permissions.
Protected methodSetAccessRule(AccessRule)Removes all access rules that contain the same security identifier and qualifier as the specified access rule in the Discretionary Access Control List (DACL) associated with this CommonObjectSecurity object and then adds the specified access rule. (Inherited from CommonObjectSecurity.)
Public methodSetAccessRule(FileSystemAccessRule)Sets the specified access control list (ACL) permission for the current file or directory.
Public methodSetAccessRuleProtectionSets or removes protection of the access rules associated with this ObjectSecurity object. Protected access rules cannot be modified by parent objects through inheritance. (Inherited from ObjectSecurity.)
Protected methodSetAuditRule(AuditRule)Removes all audit rules that contain the same security identifier and qualifier as the specified audit rule in the System Access Control List (SACL) associated with this CommonObjectSecurity object and then adds the specified audit rule. (Inherited from CommonObjectSecurity.)
Public methodSetAuditRule(FileSystemAuditRule)Sets the specified audit rule for the current file or directory.
Public methodSetAuditRuleProtectionSets or removes protection of the audit rules associated with this ObjectSecurity object. Protected audit rules cannot be modified by parent objects through inheritance. (Inherited from ObjectSecurity.)
Public methodSetGroupSets the primary group for the security descriptor associated with this ObjectSecurity object. (Inherited from ObjectSecurity.)
Public methodSetOwnerSets the owner for the security descriptor associated with this ObjectSecurity object. (Inherited from ObjectSecurity.)
Public methodSetSecurityDescriptorBinaryForm(Byte[])Sets the security descriptor for this ObjectSecurity object from the specified array of byte values. (Inherited from ObjectSecurity.)
Public methodSetSecurityDescriptorBinaryForm(Byte[], AccessControlSections)Sets the specified sections of the security descriptor for this ObjectSecurity object from the specified array of byte values. (Inherited from ObjectSecurity.)
Public methodSetSecurityDescriptorSddlForm(String)Sets the security descriptor for this ObjectSecurity object from the specified Security Descriptor Definition Language (SDDL) string. (Inherited from ObjectSecurity.)
Public methodSetSecurityDescriptorSddlForm(String, AccessControlSections)Sets the specified sections of the security descriptor for this ObjectSecurity object from the specified Security Descriptor Definition Language (SDDL) string. (Inherited from ObjectSecurity.)
Public methodToStringReturns a string that represents the current object. (Inherited from Object.)
Protected methodWriteLockLocks this ObjectSecurity object for write access. (Inherited from ObjectSecurity.)
Protected methodWriteUnlockUnlocks this ObjectSecurity object for write access. (Inherited from ObjectSecurity.)
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The FileSystemSecurity class is the base class for the FileSecurity and DirectorySecurity classes. These classes represent all of the access rights for a system file or directory and define how access attempts are audited.

The FileSystemSecurity class represents access and audit rights as a set of rules. Each access rule is represented by a FileSystemAccessRule object, while each audit rule is represented by a FileSystemAuditRule object.

The FileSystemSecurity class is an abstraction of the underlying Microsoft Windows file security system. In this system, each file or directory has a discretionary access control list (DACL), which controls access to the file or directory, and a system access control list (SACL), which specifies the access control attempts that are audited. The FileSystemAccessRule and FileSystemAuditRule classes are abstractions of access control entries (ACEs) that comprise DACLs and SACLs.

The FileSystemSecurity class hides many of details of DACLs and SACLs; you do not have to worry about ACE ordering or null DACLS.

To persist new or changed access control list (ACL) information to a file, use the SetAccessControl or SetAccessControl method. To persist new or changed ACL information to a directory, use the SetAccessControl or SetAccessControl method.

To retrieve ACL information from a file, use the GetAccessControl or GetAccessControl method. To retrieve ACL information from a directory, use the GetAccessControl or GetAccessControl method.

The following code example uses the FileSecurity class to add and then remove an access control list (ACL) entry from a file. You must supply a valid user or group account to run this example.

using System;
using System.IO;
using System.Security.AccessControl;

namespace FileSystemExample
{
    class FileExample
    {
        public static void Main()
        {
            try
            {
                string fileName = "test.xml";

                Console.WriteLine("Adding access control entry for "
                    + fileName);

                // Add the access control entry to the file.
                AddFileSecurity(fileName, @"DomainName\AccountName",
                    FileSystemRights.ReadData, AccessControlType.Allow);

                Console.WriteLine("Removing access control entry from "
                    + fileName);

                // Remove the access control entry from the file.
                RemoveFileSecurity(fileName, @"DomainName\AccountName",
                    FileSystemRights.ReadData, AccessControlType.Allow);

                Console.WriteLine("Done.");
            }
            catch (Exception e)
            {
                Console.WriteLine(e);
            }
        }

        // Adds an ACL entry on the specified file for the specified account. 
        public static void AddFileSecurity(string fileName, string account,
            FileSystemRights rights, AccessControlType controlType)
        {


            // Get a FileSecurity object that represents the 
            // current security settings.
            FileSecurity fSecurity = File.GetAccessControl(fileName);

            // Add the FileSystemAccessRule to the security settings.
            fSecurity.AddAccessRule(new FileSystemAccessRule(account,
                rights, controlType));

            // Set the new access settings.
            File.SetAccessControl(fileName, fSecurity);

        }

        // Removes an ACL entry on the specified file for the specified account. 
        public static void RemoveFileSecurity(string fileName, string account,
            FileSystemRights rights, AccessControlType controlType)
        {

            // Get a FileSecurity object that represents the 
            // current security settings.
            FileSecurity fSecurity = File.GetAccessControl(fileName);

            // Remove the FileSystemAccessRule from the security settings.
            fSecurity.RemoveAccessRule(new FileSystemAccessRule(account,
                rights, controlType));

            // Set the new access settings.
            File.SetAccessControl(fileName, fSecurity);

        }
    }
}

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.
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