/API-Security-Checklist

Checklist of the most important security countermeasures when designing, testing, and releasing your API

MIT LicenseMIT

API-Security-Checklist

Checklist of the most important security countermeasures when designing,testing, and releasing your API.

AUTHENTICATION

  • Don't use Basic Auth Use standard authentication (e.g. JWT , OAuth).
  • Don't reinvent the wheel in Authentication, token generating , password storing use the standards.

AUTHENTICATION : JWT (JSON WEB TOKEN)

  • Use random complicated key (JWT Secret) to make brute forcing token very hard.
  • Don't extract the algorithm from the payload. Force algorithm in the backend (HS256 or RS256).
  • Make token expiration (TTL , RTTL) short as possible.
  • Don't store sensetive data in the JWT payload, it can be decoded easily.

AUTHENTICATION : OAUTH

  • Always validate redirect_uri on server side to allow only whitelisted urls.
  • Always try to exchange for code not tokens (don't allow response_type=token).
  • Use state parameter with random hash to prevent CSRF on OAuth authentication process.
  • Define default scope , and validate scope parameter for each application.

ACCESS

  • Limit requests (Throttling) to avoid DDoS / Bruteforce attacks.
  • Use HTTPS on server side to avoid MITM.
  • Use HSTS header with SSL to avoid SSL Strip attack.

INPUT

  • Use proper HTTP method according to operation , GET (read), POST (create), PUT (replace/update) and DELETE (to delete a record).
  • Validate content-type on request Accept header ( Content Negotiation ) to allow only your supported format (e.g. application/xml , application/json ... etc) and respond with 406 Not Acceptable response if not matched.
  • Validate content-type of posted data as you accept (e.g. application/x-www-form-urlencoded , multipart/form-data ,application/json ... etc ).
  • Validate User input to avoid common vulnerabilities (e.g. XSS, SQL-Injection , Remote Code Execution ... etc).
  • Don't use any sensetive data ( credentials , Passwords, security tokens, or API keys) in the URL, but use standard Authorization header.

PROCESSING

  • Check if all endpoint protected behind the authentication to avoid broken authentication.
  • User own resource id should be avoided. Use /me/orders instead of /user/654321/orders
  • Don't use auto increment id's use UUID instead.
  • If you are parsing XML files , make sure entity parsing is not enable to avoid XXE.
  • Use CDN for file uploads.
  • If you are dealing with huge amount of data , use Workers and Queues to return response fast to avoid HTTP Blocking.
  • Do not forget and leave the DEBUG mode on.

OUTPUT

  • Send X-Content-Type-Options: nosniff header.
  • Send X-Frame-Options: deny header.
  • Force content-type for your response , if you return application/json then your response content-type is application/json.
  • Don't return sensetive data like credentials , Passwords, security tokens.
  • Return proper status code according to operation you done. (e.g. 200 OK , 400 Bad Request , 401 Unauthorized, 405 Method Not Allowed ... etc).

Contribution

Feel free to contribute , fork -> edit -> submit pull request. For any questions drop us an email at team@shieldfy.io.