OAuth Security: A Developer's Guide
Blog post from Didit
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OAuth 2.0 is the industry standard for delegated authorization, allowing third-party applications to access user resources without exposing credentials. Implementing OAuth securely requires an understanding of its complexities and common vulnerabilities. This guide emphasizes the shared responsibility between the OAuth provider, client application, and resource server, highlighting practices such as validating redirect URIs, using short-lived access tokens, and regularly auditing implementations. The document outlines various OAuth flows, their associated risks, and mitigation strategies, including the use of PKCE for public clients and token management techniques like refresh token rotation. Additionally, it stresses the importance of securing API endpoints with practices such as token validation, scope enforcement, and mandatory HTTPS. The guide also introduces Didit, a service offering identity verification and risk assessment to enhance OAuth security and ensure compliance with regulatory requirements.
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