feat: migrate from UUIDv4 to SecureToken for key generation #3946
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- Replace UUIDv4 with SecureToken in session, csrf, and requestid middlewares - Optimize requestid middleware to use single SecureToken fallback instead of retry loop - Update test files to use UUIDv4 for predictable test IDs - Update middleware documentation to reflect SecureToken defaults - Update go.mod to use latest utils version with SecureToken support
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Summary of ChangesHello @sixcolors, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed! This pull request significantly enhances the security and privacy of key generation within several core middlewares by transitioning from UUID-based identifiers to cryptographically secure tokens. This change impacts Session, CSRF, and RequestID middlewares, making them more robust against potential information leakage. Alongside this, the RequestID middleware's internal logic for ID generation and fallback has been optimized, and various string manipulation operations across the codebase have been refactored for improved readability and efficiency. The update also includes necessary documentation adjustments and a dependency bump to support these new security features. Highlights
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Code Review
This pull request is a great initiative to enhance security by migrating from UUIDv4 to the more secure SecureToken for key generation in various middlewares. The changes are well-implemented across the session, CSRF, and request ID middlewares, including necessary documentation and test updates. The code also benefits from several refactorings that improve readability and adopt modern Go idioms, such as using strings.Cut. My main feedback is a minor suggestion to improve the robustness of the fallback logic in the request ID middleware to ensure it aligns perfectly with the documented behavior.
middleware/requestid/requestid.go
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| if generator != nil { | ||
| for range 3 { | ||
| rid = utils.UUID() | ||
| if isValidRequestID(rid) { | ||
| return rid | ||
| } | ||
| } | ||
| rid = utils.SecureToken() | ||
| return rid | ||
| } |
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The result of utils.SecureToken() is returned directly without validation. While it's highly likely to be a valid request ID, for robustness, it would be better to validate it with isValidRequestID before returning. This would also align with the function's documentation which states it falls back to an empty string if a valid ID cannot be produced. This change ensures that if utils.SecureToken() were to produce an invalid ID, the function would correctly fall back to returning an empty string.
| if generator != nil { | |
| for range 3 { | |
| rid = utils.UUID() | |
| if isValidRequestID(rid) { | |
| return rid | |
| } | |
| } | |
| rid = utils.SecureToken() | |
| return rid | |
| } | |
| if generator != nil { | |
| rid = utils.SecureToken() | |
| if isValidRequestID(rid) { | |
| return rid | |
| } | |
| } |
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@gemini-code-assist The utils.SecureToken() function doesn’t require explicit validation because it panics on any RNG failure, just like the underlying crypto/rand.Read function it relies on. Furthermore, it uses base64.RawURLEncoding.EncodeToString, which always produces valid ASCII characters (0x20-0x7E). This makes additional checks redundant and adds unnecessary overhead. The middleware now relies on SecureToken's internal guarantees for robustness, avoiding 'generally' applied suggestions that don't account for the specific implementation details.
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Thank you for the detailed explanation, @sixcolors. I understand now that utils.SecureToken() is designed to always produce a valid, visible ASCII string due to its use of base64.RawURLEncoding.EncodeToString and its panic-on-failure behavior for RNG. Given these strong guarantees, the isValidRequestID check for the output of utils.SecureToken() is indeed redundant and would add unnecessary overhead. I withdraw my previous suggestion.
Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## main #3946 +/- ##
==========================================
+ Coverage 91.58% 91.67% +0.09%
==========================================
Files 119 119
Lines 10165 10155 -10
==========================================
Hits 9310 9310
+ Misses 543 535 -8
+ Partials 312 310 -2
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This PR migrates Fiber middlewares from using UUID or UUIDv4 to SecureToken for key generation, providing better security and privacy.
Changes
Code Changes
Documentation Updates
Dependencies
Security Benefits
Breaking Changes
Testing
Note
Waiting on utils release for SecureToken availability in production.
Related
gofiber/utils#175
gofiber/utils#171
gofiber/utils#170
GHSA-m98w-cqp3-qcqr