🔥 feat: Add HeaderLimit option to BasicAuth middleware#3620
🔥 feat: Add HeaderLimit option to BasicAuth middleware#3620ReneWerner87 merged 3 commits intomainfrom
Conversation
WalkthroughA new Changes
Sequence Diagram(s)sequenceDiagram
participant Client
participant BasicAuthMiddleware
participant Handler
Client->>BasicAuthMiddleware: Sends request with Authorization header
BasicAuthMiddleware->>BasicAuthMiddleware: Trim and check Authorization header
alt Header empty or exceeds HeaderLimit
BasicAuthMiddleware-->>Client: Respond 401 Unauthorized
else Header valid and within limit
BasicAuthMiddleware->>Handler: Pass request to handler
Handler-->>BasicAuthMiddleware: Handler response
BasicAuthMiddleware-->>Client: Forward handler response
end
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Summary of Changes
Hello @gaby, 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 enhances the BasicAuth middleware by adding a configurable HeaderLimit option. This feature allows the middleware to enforce a maximum length for the Authorization header, improving security by preventing oversized headers and refining existing validation for malformed or empty authentication attempts.
Highlights
- Security Enhancement: Introduced a
HeaderLimitoption to theBasicAuthmiddleware, allowing configuration of the maximum allowed length for theAuthorizationheader. This helps prevent potential denial-of-service attacks or resource exhaustion from excessively large headers. - Improved Header Validation: The
BasicAuthmiddleware's core logic now explicitly checks the length of theAuthorizationheader against the newHeaderLimit. Requests with headers exceeding this limit, or those that are empty/whitespace-only, will now be rejected with an unauthorized status. - Documentation and Testing: The new
HeaderLimitoption is fully documented in thebasicauth.mdfile, including its purpose and default value. Thewhats_new.mdfile has also been updated to reflect this change. Comprehensive unit tests have been added to cover various scenarios, including authorization headers that are too long, empty, or contain only whitespace.
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Code Review
This pull request introduces a HeaderLimit option to the BasicAuth middleware to control the maximum size of the Authorization header. The changes include updates to the configuration, the middleware logic to enforce the limit, documentation, and new tests.
My review found a potential issue with the correctness of the limit enforcement. I've suggested a change to ensure the limit is applied to the raw header value for better security and to prevent potential resource exhaustion attacks.
There was a problem hiding this comment.
Pull Request Overview
This PR adds a new HeaderLimit configuration option to the BasicAuth middleware to enforce maximum length restrictions on the Authorization header. This security enhancement helps prevent potential DoS attacks through excessively large headers.
- Adds
HeaderLimitconfiguration field with default value of 8192 bytes - Implements header length validation in the middleware handler
- Adds comprehensive test coverage for the new functionality
Reviewed Changes
Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.
Show a summary per file
| File | Description |
|---|---|
| middleware/basicauth/config.go | Adds HeaderLimit field to Config struct and default configuration |
| middleware/basicauth/basicauth.go | Implements header length validation logic |
| middleware/basicauth/basicauth_test.go | Adds test cases for header limit enforcement and empty authorization handling |
| docs/middleware/basicauth.md | Documents the new HeaderLimit configuration option |
| docs/whats_new.md | Updates release notes to mention the new HeaderLimit feature |
Comments suppressed due to low confidence (2)
middleware/basicauth/basicauth_test.go:148
- The variable name
casesis ambiguous. Consider renaming it toemptyHeadersorinvalidAuthHeadersto better describe what these test cases represent.
cases := []string{"", " "}
middleware/basicauth/basicauth_test.go:149
- The variable name
his too short and unclear. Consider renaming it toheaderorauthHeaderfor better readability.
for _, h := range cases {
Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## main #3620 +/- ##
==========================================
+ Coverage 91.01% 91.04% +0.02%
==========================================
Files 112 112
Lines 11290 11293 +3
==========================================
+ Hits 10276 10282 +6
+ Misses 756 754 -2
+ Partials 258 257 -1
Flags with carried forward coverage won't be shown. Click here to find out more. ☔ View full report in Codecov by Sentry. 🚀 New features to boost your workflow:
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Summary
HeaderLimitoption to BasicAuth middlewareHeaderLimitin docs