🛡️ Sentinel: [HIGH] Fix timing side-channel in string equality check#294
🛡️ Sentinel: [HIGH] Fix timing side-channel in string equality check#294EffortlessSteven wants to merge 1 commit intomainfrom
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Migrated from hand-rolled XOR fold loop to the `subtle` crate's `ConstantTimeEq` to prevent LLVM optimizations from reintroducing timing side-channel vulnerabilities during string comparisons in `authorize_token`.
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Test Results283 tests 245 ✅ 10m 52s ⏱️ Results for commit 884fd1d. |
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🚨 Severity: HIGH
💡 Vulnerability: The
constant_time_eqimplementation inhttp-auth-verifiermanually folded over bytes using^. This is a notoriously fragile approach in Rust because the LLVM compiler's optimizer can auto-vectorize or introduce early exits (short-circuiting) that break the constant-time execution, potentially allowing a timing side-channel attack to bypass authentication checks.🎯 Impact: An attacker could perform a timing attack against the
authorize_tokenfunction by measuring the time it takes to compare the token against the expected basic token, potentially extracting characters of the expected token over time.🔧 Fix: Added the industry-standard
subtlecrate as a dependency and replaced the hand-rolled loop withleft.as_bytes().ct_eq(right.as_bytes()).into(). Thesubtlecrate uses compiler optimization barriers to guarantee true constant-time execution.✅ Verification: Tested against existing constant-time equality and token validation test suites using
cargo test -p http-auth-verifier. Runcargo fmtandcargo clippy.PR created automatically by Jules for task 11932929562856901390 started by @EffortlessSteven