test(e2e): add bypass detection test for sandbox REJECT rules#1368
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Validates that direct TCP connections bypassing the HTTP CONNECT proxy are rejected immediately (ECONNREFUSED) rather than hanging until a network timeout. This is implementation-agnostic — it tests observable kernel behavior regardless of whether rules are installed via iptables or nftables.
russellb
requested review from
a team,
derekwaynecarr,
maxamillion and
mrunalp
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/ok to test 113ecb8 |
johntmyers
approved these changes
May 14, 2026
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Summary
Add an e2e test that validates sandbox bypass detection provides fast-fail UX: direct TCP connections that skip the HTTP CONNECT proxy are rejected with ECONNREFUSED (immediate) rather than hanging until a network timeout.
Related Issue
Related to #1335
Changes
e2e/rust/tests/bypass_detection.rswith a single testbypass_attempt_is_rejected_fastsocket.connect()to an RFC 5737 TEST-NET-2 address, and asserts the connection is refused in under 3 secondsTesting
mise run pre-commitpassesfind_iptables()to return None, confirmed test fails withtimeoutafter 10sChecklist