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StrongNameIdentityPermissionAttribute Class

.NET Framework 4

Updated: May 2010

Allows security actions for StrongNameIdentityPermission to be applied to code using declarative security. This class cannot be inherited.

System.Object
  System.Attribute
    System.Security.Permissions.SecurityAttribute
      System.Security.Permissions.CodeAccessSecurityAttribute
        System.Security.Permissions.StrongNameIdentityPermissionAttribute

Namespace:  System.Security.Permissions
Assembly:  mscorlib (in mscorlib.dll)
C#
C++
F#
VB
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[SerializableAttribute]
[AttributeUsageAttribute(AttributeTargets.Assembly|AttributeTargets.Class|AttributeTargets.Struct|AttributeTargets.Constructor|AttributeTargets.Method, AllowMultiple = true, 
	Inherited = false)]
[ComVisibleAttribute(true)]
public sealed class StrongNameIdentityPermissionAttribute : CodeAccessSecurityAttribute

The StrongNameIdentityPermissionAttribute type exposes the following members.

  Name Description
Public method StrongNameIdentityPermissionAttribute Initializes a new instance of the StrongNameIdentityPermissionAttribute class with the specified SecurityAction.
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  Name Description
Public property Action Gets or sets a security action. (Inherited from SecurityAttribute.)
Public property Name Gets or sets the name of the strong name identity.
Public property PublicKey Gets or sets the public key value of the strong name identity expressed as a hexadecimal string.
Public property TypeId When implemented in a derived class, gets a unique identifier for this Attribute. (Inherited from Attribute.)
Public property Unrestricted Gets or sets a value indicating whether full (unrestricted) permission to the resource protected by the attribute is declared. (Inherited from SecurityAttribute.)
Public property Version Gets or sets the version of the strong name identity.
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  Name Description
Public method CreatePermission Creates and returns a new StrongNameIdentityPermission. (Overrides SecurityAttribute.CreatePermission().)
Public method Equals Infrastructure. Returns a value that indicates whether this instance is equal to a specified object. (Inherited from Attribute.)
Protected method Finalize Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
Public method GetHashCode Returns the hash code for this instance. (Inherited from Attribute.)
Public method GetType Gets the Type of the current instance. (Inherited from Object.)
Public method IsDefaultAttribute When overridden in a derived class, indicates whether the value of this instance is the default value for the derived class. (Inherited from Attribute.)
Public method Match When overridden in a derived class, returns a value that indicates whether this instance equals a specified object. (Inherited from Attribute.)
Protected method MemberwiseClone Creates a shallow copy of the current Object. (Inherited from Object.)
Public method ToString Returns a string that represents the current object. (Inherited from Object.)
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  Name Description
Explicit interface implemetation Private method _Attribute.GetIDsOfNames Maps a set of names to a corresponding set of dispatch identifiers. (Inherited from Attribute.)
Explicit interface implemetation Private method _Attribute.GetTypeInfo Retrieves the type information for an object, which can be used to get the type information for an interface. (Inherited from Attribute.)
Explicit interface implemetation Private method _Attribute.GetTypeInfoCount Retrieves the number of type information interfaces that an object provides (either 0 or 1). (Inherited from Attribute.)
Explicit interface implemetation Private method _Attribute.Invoke Provides access to properties and methods exposed by an object. (Inherited from Attribute.)
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Important note Important

Starting with the .NET Framework version 4, identity permissions are not used.

In the .NET Framework versions 1.0 and 1.1, demands on the identity permissions are effective, even when the calling assembly is fully trusted. That is, although the calling assembly has full trust, a demand for an identity permission fails if the assembly does not meet the demanded criteria. In the .NET Framework version 2.0 and later, demands for identity permissions are ineffective if the calling assembly has full trust. This assures consistency for all permissions, eliminating the treatment of identity permissions as a special case.

The scope of the declaration that is allowed depends on the SecurityAction that is used. You can obtain the key string for this attribute by running the Strong Name tool (Sn.exe) with the token and public key options (Sn -tp keyfile) against a file that has an Authenticode signature. For more information, see Sn.exe (Strong Name Tool).

The security information declared by a security attribute is stored in the metadata of the attribute target and is accessed by the system at run time. Security attributes are used only for declarative security. For imperative security, use the corresponding permission class.

The StrongNameIdentityPermissionAttribute attribute can be used to define strong-name requirements for access to public members at the assembly level. In the .NET Framework version 2.0 and later, you can also use the InternalsVisibleToAttribute attribute to specify that all nonpublic types in that assembly are visible to another assembly. For more information, see Friend Assemblies (C# and Visual Basic) or Friend Assemblies (Visual Basic).

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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.

Date

History

Reason

May 2010

Noted that identity permissions are no longer used.

Content bug fix.
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What to use then?
I have the same question! What to use instead? I won't go for InternalsVisibleToAttribute as I want the specify it on a per class level. I sure hope that a .Net 4 application using a .Net 2 library still won't get access to "privileged" functions.
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So is it deprecated?
Ok, if identity permissions are no longer used in .NET 4, then what does one do instead if one wants to try to stop "unauthorized" callers from using one's assembly/class/method? Other than change its access to non-public - assume it is public because it needs to be consumed by many other assemblies within your own organization and you don't want to add a bunch of [InternalsVisibleTo] attributes and you don't want 3rd-party apps/libraries being able to consume it.
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