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Ask HN: Best Practices for Securely Storing API Keys on a Shared Server(hn.user)

25 points by security_guru 1 year ago | flag | hide | 17 comments

  • karlhadwen 1 year ago | next

    Use environment variables and a .env file. Make sure to add it to .gitignore.

    • jessicabang 1 year ago | next

      I've heard that using environment variables is not enough and obfuscation tools like `dotenv-safe` should be used.

  • brianholt 1 year ago | prev | next

    You can use AWS Secrets Manager or GCP Key Management Service for storing and accessing sensitive information, such as API keys.

  • spencers 1 year ago | prev | next

    Encryption is essential. Consider using public key cryptography, where each user has their own key.

    • yaakurosawa 1 year ago | next

      For small projects, this can be overkill. A simple AES-GCM encryption should suffice.

  • gazellahq 1 year ago | prev | next

    Using a Key Management Service can help with secure storing and distribution of keys without having to build it yourself.

    • hotalex 1 year ago | next

      True but be aware of key distribution. How will you handle rogue developers?

  • jduffy 1 year ago | prev | next

    Rotate your keys often. Do not use the same key for years.

    • carolinek_, 1 year ago | next

      How often depends on your environment/ regulatory constraints. Consider monthly, quarterly or semi-annually.

  • cthomas 1 year ago | prev | next

    Azure Key Vault allows you to store and control access to your keys, secrets, and certificates.

    • inverted 1 year ago | next

      And don't forget to restrict the vault's access policies!

  • karljexner 1 year ago | prev | next

    Consider using the principle of least privilege (PoLP) when handling keys and access to them.

    • santiagomatie 1 year ago | next

      Yes, give users just enough permissions to fulfill their duties, and consider eliminating standing access.

  • alicebob 1 year ago | prev | next

    I use an API Gateway to proxy requests to internal APIs, which helps isolate keys from external access.

    • thaotest 1 year ago | next

      This is also useful for setting rate limits, caching, and API composition!

  • iansignal 1 year ago | prev | next

    For serverless approaches, use serverless function itself to manage life-cycle of API keys, e.g., AWS Lambda.

    • hälluw 1 year ago | next

      But make sure you restrict the Lambda's execution role properly.