Net 4.7 Machine Key Generator

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by Won Yoo

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Compatibility

  • Machine Key Generator in ASP.NET This tool allows you to generate random keys for valdiation and ecnryption/decryption of the view state. It builds a element which you need to include in your web.config file. The validation key should be in the range of 20 to 64. Decryption key—8 or 24.
  • ML.NET offers Model Builder (a simple UI tool) and ML.NET CLI to make it super easy to build custom ML Models. These tools use Automated ML (AutoML), a cutting edge technology that automates the process of building best performing models for your Machine Learning scenario.
  • ASP.NET machineKey Generator This is an application that will generate a valid machineKey block with random, secure, hard-coded keys that you can paste inside the in your web.config or machine.config file.
  • This tool allows you to create a valid random machine key for validation and encryption/decryption of ASP.NET view state. This is beneficial in a webfarm where all of the server nodes need to have the same machine key, and it is also beneficial on a single box to keep the machine key consistent between IIS recycles and server reboots.
  • Internet Information Services (IIS) version 6.0 or later. To access the features of ASP.NET, IIS with the latest security updates must be installed before the.NET Framework is installed. ASP.NET is supported only on Windows XP Professional, Windows Server 2003, Windows Server 2008, and Windows Server 2008 R2.
VersionNotes
IIS 8.0IIS management tools have been updated for ASP.net 4.5 in IIS 8.0.
IIS 7.5IIS management tools have not been updated for ASP.net 4.5 in IIS 7.5.
IIS 7.0IIS management tools have not been updated for ASP.net 4.0 in IIS 7.0

Problem

Windows Server 2012 includes .NET Framework 4.5 by default, as well as optional installation of the .NET 3.5 Framework. Developers and administrators frequently need to run both ASP.net 3.5 and ASP.net 4.5 web applications and therefore they also need the ability to manage them both appropriately.

Solution

Nov 11, 2013 Last week, I posted an updated version of the.NET Framework setup verification tool that supports verifying the.NET Framework 4.5.1.This past weekend, a customer reported a problem where the tool wasn’t correctly detecting that the.NET Framework 4.5.1 is installed on Windows 8.1.

IIS 8.0 supports managing both ASP.NET 3.5 and ASP.NET 4.5 applications using both the graphical IIS Manager tool as well as IIS' command-line management tools.

Both graphical and command line IIS management tools operate in a version-specific manner when reading or writing configuration information for ASP.NET applications. For example, ASP.NET administration modules running in the IIS Server Manager will display configuration options applicable for the specific ASP.NET version used by an application.

Step by Step Instructions

Prerequisites:

The concepts demonstrated in this walkthrough require a Windows Server 2012 machine with all of the following installed: IIS 8.0, ASP.NET 3.5, and ASP.NET 4.5.

Prior to this walkthrough, readers should have already completed the companion walkthrough: Using ASP.NET 3.5 and ASP.NET 4.5 on IIS 8.0. That document walks readers through installing all three features, as well as sample applications for both versions of ASP.NET.

Workarounds for known bugs:

There are no known bugs for this feature at this time.

Displaying ASP.NET Administration Modules

Start the IIS Manager UI and expand the treeview on the left-hand side of the window so that the 'Default Web Site' and its children are both showing:

The right-hand portion of the IIS Manager UI shows the administrative modules available for managing the ASP.NET application highlighted in the treeview. In this case since Default Web Site is selected, and by default this website supports ASP.NET 4.5, the IIS Manager displays 15 different ASP.NET-specific administration modules. The icons shown above in red outlining are the three administration modules that are only available for use with ASP.NET 4.5 applications.

You can see the high-level differences between managing ASP.NET 3.5 and ASP.NET 4.5 application in the IIS Manager below. Since the 'example35' application is configured for ASP.NET 3.5, only 12 ASP.NET-specific administration modules are available:

As noted above, the IIS Manager in IIS 8.0 supports three additional administration modules when managing ASP.NET 4.5:

  • Providers: This administration module supports centralized management of pluggable persistence providers for ASP.NET 4.5's Membership, Role Manager and Profile feature.
  • .NET Users: Interactive UI-based creation, deletion and modification of Membership users for ASP.NET 4.5 applications.
  • .NET Roles: UI-based creation/deletion of roles, as well as integration with the '.NET Users' module for adding and removing users to/from roles. As with the previous two administration modules, the '.NET Roles' module is used to manage ASP.NET 4.5 applications

Managing ASP.NET Compilation Settings

Many of the administration modules that exist for both ASP.NET 3.5 and ASP.NET 4.5 expose the same functionality. However as some ASP.NET features evolve over time additional configuration options are added in newer .NET Framework versions. The ASP.NET administration modules in the IIS Manager support this by dynamically changing the options they display depending on the version of the ASP.NET application being managed.

Below is a screenshot of .NET Compilation for ASP.NET 3.5:

And below is the corresponding configuration for ASP.NET 4.5. You will see the configuration options have expanded to include new ASP.NET 4.5 capabilities:

The two new options available in ASP.NET 4.5 applications are:

  • Enable JIT Profiling: By default ASP.NET 4.5 will work with the CLR's JIT compilation to enable background compilation of speculative JIT execution paths using additional CPU cores.
  • Enable Prefetch: An ASP.NET 4.5 feature available only on Windows Server 2012 that integrates the ASP.NET 4.5 compilation system with the Windows Server 8 Superfetch service. When both the Superfetch service and ASP.NET Prefetch option are enabled, Windows Server 2012 will profile ASP.NET compilation during the startup of web applications in order to dynamically optimize disk performance when loading managed assemblies.

Managing ASP.NET Machine Key Settings

Below is a screenshot of Machine Key for ASP.NET 3.5. The 'Validation method' or 'Encryption method' dropdowns display the supported hashing and encryption algorithms used by various security features in ASP.NET 3.5: (Note: in the picture below the dropdowns are arranged horizontally so both sets of options can be shown.)

And below is the corresponding configuration for ASP.NET 4.5.

In ASP.NET 4.5 the same set of encryption algorithms are available (AES was available as far back as .NET 2.0). However, in ASP.NET 4.5, the built-in support for hashing algorithms has been expanded to include the SHA-2 family of keyed hash algorithms (HMACSHA256, HMACSHA384, and HMACSHA512).

Managing ASP.NET Pages and Controls

Below is a screenshot of Pages and Controls for ASP.NET 3.5. The administration module will display a subset of commonly used configuration options for ASP.NET 3.5 applications:

And below is the corresponding configuration for ASP.NET 4.5. The options available in the 'Behavior' portion have expanded to include new settings for ASP.NET 4.5:

As ASP.NET progresses through different versions, there are continual modifications to the HTML, Javascript and CSS emitted by various features and controls. However existing applications may expect specific formats for rendered output. ASP.NET 4.5 can be configured to support older rendering formats using the new settings exposed in the 'Pages and Controls' administration module:

  • ClientID Mode: Defaults to the new setting of 'Predictable' which results in stable identifiers being emitted for the 'id' attribute on rendered HTML elements. This setting can be changed to 'AutoID' to mimic the ID generation behavior used in previous releases of ASP.NET.
  • Control Rendering Compatibility Version: As the name of this setting suggests, this controls which version of rendered HTML/Javascript/CSS output is used by various ASP.NET controls. This property can be set to '3.5', in which case ASP.NET 4.5 will emit output that matches the format created by ASP.NET 3.5.

Summary

IIS 8.0 supports running both ASP.NET 3.5 and ASP.NET 4.5 applications on the same machine using different application pools to host each .NET Framework version. To support administering both types of ASP.NET applications, IIS 8.0's management tools (both UI and command-line) also support managing multiple ASP.NET versions. Furthermore the IIS 8.0 Server Manager UI dynamically displays appropriate management options depending on which version of ASP.NET application is being managed.

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The implementation of the <machineKey> element in ASP.NET is replaceable. This allows most calls to ASP.NET cryptographic routines to be routed through a replacement data protection mechanism, including the new data protection system.

Package installation

Note

The new data protection system can only be installed into an existing ASP.NET application targeting .NET 4.5.1 or later. Installation will fail if the application targets .NET 4.5 or lower.

To install the new data protection system into an existing ASP.NET 4.5.1+ project, install the package Microsoft.AspNetCore.DataProtection.SystemWeb. This will instantiate the data protection system using the default configuration settings.

When you install the package, it inserts a line into Web.config that tells ASP.NET to use it for most cryptographic operations, including forms authentication, view state, and calls to MachineKey.Protect. The line that's inserted reads as follows.

Tip

You can tell if the new data protection system is active by inspecting fields like __VIEWSTATE, which should begin with 'CfDJ8' as in the example below. 'CfDJ8' is the base64 representation of the magic '09 F0 C9 F0' header that identifies a payload protected by the data protection system.

Package configuration

Net 4.7 Machine Key Generator Free

The data protection system is instantiated with a default zero-setup configuration. However, since by default keys are persisted to the local file system, this won't work for applications which are deployed in a farm. To resolve this, you can provide configuration by creating a type which subclasses DataProtectionStartup and overrides its ConfigureServices method.

Below is an example of a custom data protection startup type which configured both where keys are persisted and how they're encrypted at rest. It also overrides the default app isolation policy by providing its own application name.

Net 4.7 Machine Key Generator

Tip

You can also use <machineKey applicationName='my-app' .. /> in place of an explicit call to SetApplicationName. This is a convenience mechanism to avoid forcing the developer to create a DataProtectionStartup-derived type if all they wanted to configure was setting the application name.

Net 4.7 Machine Key Generator Download

To enable this custom configuration, go back to Web.config and look for the <appSettings> element that the package install added to the config file. It will look like the following markup:

Fill in the blank value with the assembly-qualified name of the DataProtectionStartup-derived type you just created. If the name of the application is DataProtectionDemo, this would look like the below.

Machine Key Stock

The newly-configured data protection system is now ready for use inside the application.