🛡️ Sentinel: [HIGH] Fix timing side-channel in token validation#314
🛡️ Sentinel: [HIGH] Fix timing side-channel in token validation#314EffortlessSteven wants to merge 2 commits intomainfrom
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Summary of ChangesHello, 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 implements a critical security enhancement by integrating a constant-time comparison mechanism for token validation. This change directly mitigates a high-severity timing side-channel vulnerability, ensuring that authentication processes are robust against attacks that exploit execution time differences to infer sensitive information. Highlights
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Code Review
This pull request integrates the subtle crate to improve the constant_time_eq function by utilizing subtle::ConstantTimeEq for secure string comparison. The reviewer suggests managing the subtle dependency as a workspace dependency for better consistency.
| [dependencies] | ||
| jsonwebtoken = { version = "10.2.0", features = ["rust_crypto"] } | ||
| serde.workspace = true | ||
| subtle = "2.6.1" |
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For consistency with other dependencies in this crate (like serde and tracing) and to promote version uniformity across the workspace, it's recommended to manage subtle as a workspace dependency. Please consider adding it to the root Cargo.toml and referencing it here.
| subtle = "2.6.1" | |
| subtle.workspace = true |
Test Results283 tests 245 ✅ 11m 28s ⏱️ Results for commit e4f2414. |
1 participant
Scope
Type: Security Fix
Intent: Replace manual fold-based XOR comparison with a compiler-black-boxed constant-time comparison to prevent timing side channels.
Touchpoints:
crates/http-auth-verifier/src/lib.rs,crates/http-auth-verifier/Cargo.tomlEvidence: Lints pass,
cargo test -p http-auth-verifierpasses, implementation defers to auditedsubtlecrate.🚨 Severity: HIGH
💡 Vulnerability: Manual
fold-based byte-by-byte comparisons can be optimized by LLVM (e.g., auto-vectorization, short-circuiting) resulting in variable execution times. This creates a timing side channel that could theoretically allow an attacker to guess the correct basic token length and content character-by-character.🎯 Impact: Attackers could bypass platform HTTP authentication if they iteratively guess the valid literal basic token.
🔧 Fix: Added the
subtlecrate and used itsConstantTimeEqtrait (ct_eq) which utilizes compiler black boxes to ensure true constant-time evaluation.✅ Verification:
cargo test -p http-auth-verifierruns normally. The proptest confirming thatconstant_time_eqaligns logically with standard equality still passes perfectly.PR created automatically by Jules for task 7811448573488884197 started by @EffortlessSteven