CircuitVerse Merges JWT Validator to Secure LTI Platform Authentication

·1 views

Two pull requests were merged during week 9 of a CircuitVerse development sprint, with the most security-critical component being Lti::JwtValidator, a class designed to verify LTI authentication tokens. The validator defends against common JWT attacks including algorithm confusion, unsigned tokens, expired credentials, replayed nonces, and malformed audience claims by enforcing an explicit algorithm allow-list rather than trusting the token header. A JWKS key-fetching mechanism was also built to support platform key rotation and caching, reducing redundant outbound HTTP requests on every LTI launch. Code review caught two previously unhandled failure modes — a blank JWKS URL and malformed stored key data that raised unexpected errors instead of a consistent ValidationError. A maintainer's suggestion to refactor using JWT::EncodedToken was adopted, improving safety by preventing payload access before signature and claims verification are confirmed.

Read the full story at DEV Community

This is an AI-generated summary. ShortSingh links to the original source for the complete article.

Discussion (0)

The 'void' Keyword in C Has Four Uses — More Than You Might Expect

The 'void' keyword in C has four distinct uses, which is one more than the often-cited three uses of 'static'. The keyword was not part of the original K&R dialect of C, where functions with no return value simply omitted the return type and were assumed to return int. Stephen Bourne, creator of the Bourne Shell, pushed for its addition after finding this ambiguity frustrating, and Dennis Ritchie agreed since explicitly returning nothing could save a machine instruction. Later, 'void' was reused to indicate that a function takes no parameters when C adopted function prototypes back-ported from C++, ensuring backward compatibility with older code. The keyword has since influenced several other programming languages, including Java, C#, D, and Swift.

0 comments Read more at DEV Community

ProgrammingDEV Community ·

Developers Debate Best Practices for Structuring Frontend Projects

A discussion has emerged in the developer community around how frontend projects should be organized, a topic seen as less explored than its backend counterpart. Common approaches include organizing code by file type, by feature, or following framework-specific conventions such as Angular's predefined structure. The conversation also touches on whether advanced methodologies like Domain-Driven Design and Clean Architecture are practical for frontend applications or represent unnecessary complexity. Some developers suggest that a straightforward feature-based structure may be sufficient for most use cases. The debate highlights a broader need for clearer, widely accepted architectural guidance in frontend development.

0 comments Read more at DEV Community

ProgrammingDEV Community ·

AI-generated service wiped database on startup yet passed all 18 automated tests

A software developer testing an AI-generated billing service discovered it dropped and recreated all database tables on every startup, effectively destroying existing data. Despite this critical flaw, the service passed all 18 automated test scenarios because each test built its own state from scratch in an empty database. Since repeatable tests always start clean, the destructive startup behavior was indistinguishable from a normal fresh start, leaving the defect completely untested. The root cause was the AI agent interpreting a schema description as an instruction to create tables at launch, unaware that existing rows might already be present. The author concludes the fix is not writing more tests, but asking a different question — one that verifies behavior against a pre-populated database rather than an empty one.

0 comments Read more at DEV Community

ProgrammingDEV Community ·

CircuitVerse Implements LTI 1.3 Login Endpoint, Fixes Security Gaps Found by CodeQL

CircuitVerse shipped the first stage of its LTI 1.3 integration this week, implementing the /lti/login endpoint that handles the OpenID Connect initiation request from a Learning Management System. The controller, built in around 64 lines of code with 150 lines of tests, redirects the LMS to an authorization URL after resolving the incoming credentials to a registered deployment. A CodeQL scan flagged a potential CSRF vulnerability caused by broadly skipping token verification, which was resolved by overriding the verification predicate to apply only to the specific parameters expected in an LTI login request. Code review surfaced three additional issues — ambiguous deployment lookups, unvalidated authorization URLs that could allow redirects to malicious endpoints, and registered query parameters being silently dropped — all of which were addressed before merging. A separate debugging session traced a database schema mismatch to an abandoned proof-of-concept migration from earlier in the project, highlighting the risk of leaving experimental migrations applied to a development database.

0 comments Read more at DEV Community