Can PHP Applications Implement Cross-Domain Single Sign-On (SSO)?

Cross-Domain Cookies: Addressing the Challenge

Question:

Can a PHP application set cookies for multiple domains, enabling single sign-on (SSO) across these domains?

Answer:

It is not possible for one domain to directly set cookies for another domain. Attempts to do so would pose security vulnerabilities.

Alternatives and Approaches:

Instead, consider these approaches to achieve SSO across domains:

• Back Channel: Sites communicate directly with each other to verify user identity.
• Token Passing: A digitally signed token containing user and session information is passed between domains via GET or POST parameters during redirects.

Implementation:

Implement token passing or back channel communication using a third-party library such as SimpleSAMLPHP. This library provides a secure and efficient mechanism for SSO across multiple domains.

Additional Considerations:

• Security: Ensure that the token or communication channel is securely implemented to prevent unauthorized access.
• User Experience: Ensure that the SSO process is seamless and frictionless for users.
• Browser Compatibility: Test your implementation across different browsers to ensure compatibility.

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