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Migrating applications to MSAL.NET or Microsoft.Identity.Web

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Warning

Azure Active Directory Authentication Library (ADAL) has been deprecated. While existing apps that use ADAL will continue to work, Microsoft will no longer release security fixes on ADAL. Use the Microsoft Authentication Library (MSAL) to avoid putting your app's security at risk.

Why migrate to MSAL.NET or Microsoft.Identity.Web

Both the Microsoft Authentication Library for .NET (MSAL.NET) and Azure AD Authentication Library for .NET (ADAL.NET) are used to authenticate Microsoft Entra entities and request tokens from Microsoft Entra ID.

Up until now, most developers have requested tokens from Microsoft Entra ID for developers platform (v1.0) using Azure AD Authentication Library (ADAL). These tokens are used to authenticate Microsoft Entra identities (work and school accounts).

Because ADAL is deprecated, we strongly advise our customers to migrate to MSAL or higher-level libraries that are based on MSAL, such as Microsoft.Identity.Web. MSAL offers several key benefits:

  • You can authenticate a broader set of Microsoft identities: work or school accounts, personal Microsoft accounts, and social or local accounts with Azure AD B2C and Microsoft Entra External ID.
  • Your users get the best single-sign-on (SSO) experience.
  • Your application can enable incremental consent, Conditional Access, and other emerging security capabilities.
  • You benefit from continuous innovation in terms of security and resilience,

Important

MSAL.NET or Microsoft.Identity.Web are now the recommended auth libraries to use with the Microsoft identity platform. No new features will be implemented in ADAL. For details see the announcement: Update your applications from ADAL to MSAL.

Should you migrate to MSAL.NET or to Microsoft.Identity.Web

Before digging in the details of MSAL.NET vs ADAL.NET, you might want to check if you want to use MSAL.NET or a higher-level library like Microsoft.Identity.Web.

For details about the decision tree below, read MSAL.NET or Microsoft.Identity.Web.

Block diagram explaining how to choose if you need to use MSAL.NET and Microsoft.Identity.Web or both when migrating from ADAL

Importance of logging with MSAL

Among its many capabilities, Microsoft Authentication Library (MSAL) has robust built-in logging features. Enabling logging in your applications ensures that you have a direct line of sight on any authentication issues and can both diagnose them easier for your own application and help the MSAL team quickly address potential problems. We strongly recommend that you enable logging for your applications when deployed in any production scenarios.

Deprecated ADAL.NET NuGet packages and their MSAL.NET equivalents

You might unknowingly consume ADAL dependencies from other Azure SDKs. Below are few of the deprecated packages and their MSAL alternatives. For more detailed migration information, see AppAuthentication to Azure.Identity Migration Guidance and Migration guide links in the specific Azure SDK for .NET library pages.

Legacy Package (ADAL-dependent, deprecated) Supported Package (MSAL-dependent, current)
Microsoft.Azure.KeyVault Azure.Security.KeyVault.Secrets, Azure.Security.KeyVault.Keys, Azure.Security.KeyVault.Certificates
Microsoft.Azure.Management.Compute Azure.ResourceManager.Compute
Microsoft.Azure.Services.AppAuthentication Azure.Identity
Microsoft.Azure.Management.StorageSync Azure.ResourceManager.StorageSync
Microsoft.Azure.Management.Fluent Azure.ResourceManager
Microsoft.Azure.Management.EventGrid Azure.ResourceManager.EventGrid
Microsoft.Azure.Management.Automation Azure.ResourceManager.Automation
Microsoft.Azure.Management.Compute.Fluent Azure.ResourceManager.Compute
Microsoft.Azure.Management.MachineLearning.Fluent Azure.ResourceManager.MachineLearningCompute
Microsoft.Azure.Management.Media, windowsazure.mediaservices Azure.ResourceManager.Media

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