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ADFS: Legacy System and OAuth2 Integration Overview

/ 1 min read

🔑 Microsoft ADFS: Understanding Its Legacy and OAuth2 Integration. Microsoft has been encouraging users to transition from Active Directory Federation Services (ADFS) to Entra ID, yet ADFS remains prevalent in many organizations, particularly in hybrid environments. This article delves into ADFS’s internal workings, focusing on its OAuth2 capabilities, including Device Registration Services (DRS) and Primary Refresh Tokens (PRT). It highlights the complexities of configuring OAuth2 clients, the authentication methods available, and the implications of device authentication in both legacy and hybrid setups. The author also discusses potential attack vectors, such as phishing through Device Code OAuth2 flows, and the concept of Golden JWTs, which can be exploited for unauthorized access. Overall, the post serves as a resource for understanding ADFS’s relevance in modern identity management.

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