Java and OAuth 2.0 Security Updates
1 ) Overview of OAuth 2.0 and Security Practices
OAuth 2.0 is the industry standard protocol for authorization, designed for simplicity for client developers and supporting multiple authorization flows for web, desktop, mobile, and device applications.
OAuth 2.1 is an upcoming consolidation effort to unify OAuth 2.0 and its common extensions without introducing new behaviors, focusing mainly on better default security.
2 ) Key Highlights of OAuth 2.1
OAuth 2.1 aims to be a single comprehensive document outlining best practices and security recommendations for both OAuth clients and authorization servers.
The specification removes insecure or less secure legacy grants such as the Implicit grant and Resource Owner Password Credentials grant.
OAuth 2.1 is pending review and release, and widespread adoption is expected to take time post release.
3 ) RFC 9700 OAuth 2.0 Security Best Current Practice
RFC 9700, published in January 2025, provides updated security advice, extending prior RFCs related to OAuth 2.0.
It highlights new threats due to broader OAuth applications, deprecates insecure operational modes, and recommends best practices for protecting redirect based flows, preventing token replay, and securing client authentication.
Important mitigations include strict redirect URI validation, prevention of credential leakage, and protection against mix up attacks and authorization code injection.
4 ) Java Custom Connectors and OAuth 2.0 Redirect URI Updates
In the Microsoft Power Platform ecosystem (Power Apps, Logic Apps), custom connectors that utilize OAuth 2.0 must adopt a unique, per connector redirect URI.
New custom connectors automatically have a unique redirect URI set; existing connectors need to be updated to use per connector redirect URIs before February 17, 2024.
Failing to update existing custom connectors will cause them to stop working for new connections and will produce user error messages.
Developers can update their connectors either via the Power Platform web interface (security tab option) or by using the CLI tool with the appropriate setting (`redirectMode`: `GlobalPerConnector`).
After updating, developers must remove the old global redirect URI from their OAuth 2.0 app configuration and add the newly generated unique redirect URIs.
5 ) Practical Developer Guidance
Developers should proactively check and update their custom connectors to comply with the new security requirement.
Tools such as Power Apps for Admin connector can help identify which custom connectors require update.
The move to unique redirect URIs aims to improve OAuth 2.0 security by mitigating risks associated with shared redirect URIs across multiple connectors.
Summary:
The landscape of OAuth 2.0 security has significantly evolved with the introduction of OAuth 2.1 and the publication of RFC 9700, which consolidates best current security practices. Legacy less secure grant types are deprecated, and stronger protections like unique redirect URIs are mandated. Specifically, Java developers using OAuth 2.0 with custom connectors in Microsoft Power Platform must update to per connector redirect URIs by early 2024 to maintain security and operational compliance. This move enhances security by isolating OAuth flows per connector, reducing attack surfaces related to redirect URI vulnerabilities.
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