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fetch: report a handshake cut short as ECONNRESET or ERR_SSL_<REASON>, not as a certificate error - #41447
fetch: report a handshake cut short as ECONNRESET or ERR_SSL_<REASON>, not as a certificate error#41447robobun wants to merge 6 commits into
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… certificate error A TLS handshake that ends before any certificate verdict exists was reported as UNKNOWN_CERTIFICATE_VERIFICATION_ERROR. uSockets delivers such failures to on_handshake with its transport pseudo-codes (-46 ECONNRESET when the peer closes mid-handshake, -71 EPROTO for a fatal TLS protocol error) and the HTTP client fed them into the X509 verdict table. Map them to ConnectionClosed (ECONNRESET) and a new EPROTO error that carries the OpenSSL reason string. The cert-mismatch churn fixture dials localhost with servers bound to 127.0.0.1 only. On macOS the listener-less ::1 leg can TCP self-connect when its ephemeral port equals the destination port, which wins the address race and fails the handshake with EPROTO. Listen dual-stack so both legs have a listener.
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Status: reproduced the darwin failure on a CI mini with a loopback packet capture (TCP self-connect on the ::1 leg, one run in four). That test-only fixture fix is split out as #41455. This PR fixes the error code: uSockets' ECONNRESET/EPROTO handshake codes now map to ECONNRESET and ERR_SSL_ (the node:tls shape) instead of the unknown-certificate fallback, for fetch and bun install (#31949). The 5 new tests fail on released bun and pass on the debug build. Supersedes #31950, #34182 and #34921. CI on the final shape (build 110518): test/js/web/fetch/fetch.tls.test.ts and test/cli/install/bun-install-stalled-tls.test.ts pass on every lane. The three red tests are unrelated and already with main-break triage: the pre-existing napi test_object/do.test.ts stall (debian 13 x64), bun-publish.test.ts (Verdaccio exits 2 in beforeEach, ubuntu 25.04 x64, also red in the original build 110411), and socket-syscall-fault.test.ts (Bun.listen TLS teardown flight count under the parallel batch, darwin aarch64; this diff does not touch that path). Earlier runs 110449 and 110459 were green on every darwin lane. Ready for review. |
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No actionable comments were generated in the recent review. 🎉 ℹ️ Recent review info⚙️ Run configurationConfiguration used: Path: .coderabbit.yaml Review profile: ASSERTIVE Plan: Essentials Run ID: 📒 Files selected for processing (3)
Included review availability: Your plan provides up to 10 included reviews per hour; 0 remain after this review. WalkthroughTLS handshake failures now preserve OpenSSL reason text and map to certificate, connection-closed, or protocol errors. Fetch exposes protocol-specific ChangesTLS handshake error propagation
Suggested reviewers: Merge Risk: ⚪ Minimal · up to TLS handshake failures now distinguish connection resets, protocol errors, and certificate failures while preserving OpenSSL reasons for fetch and installation errors. Regression coverage covers handshake disconnects and invalid TLS data, with no current merge-blocking risk identified. 🚥 Pre-merge checks | ✅ 4✅ Passed checks (4 passed)
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Inline comments:
In `@src/http/lib.rs`:
- Line 1573: Update ProxyTunnel::on_handshake so handshake_failure_error is
invoked for every failed handshake where handshake_error.error_no is nonzero,
including cases where handshake_success is false. Set did_have_handshaking_error
before the success/failure branch or otherwise ensure the failure path cannot
skip the ConnectionClosed/EPROTO mapping instead of falling back to
ConnectionRefused.
In `@src/http/ProxyTunnel.rs`:
- Line 424: Update the failed proxy TLS handshake handling around
handshake_error so mapping does not depend on the stale
did_have_handshaking_error flag. Ensure nonzero handshake_error.error_no reaches
handshake_failure_error and preserves the expected ECONNRESET or EPROTO result
instead of ConnectionRefused.
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src/http/HTTPContext.rssrc/http/InternalState.rssrc/http/ProxyTunnel.rssrc/http/error.rssrc/http/lib.rssrc/runtime/webcore/fetch/FetchTasklet.rstest/js/web/fetch/fetch.tls.cert-mismatch-churn.fixture.tstest/js/web/fetch/fetch.tls.test.ts
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On the two ProxyTunnel comments: the tunnel's inner handshake runs through the Rust |
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Nothing blocking. The comments below are optional suggestions. There is no need to push a fix for them before merging.
Beyond the inline finding, I checked the other HTTPClientResult { … } construction sites — the preconnect one at src/http/lib.rs:4396 uses ..Default::default() and into_owned was updated, so no field is dropped. The new Error::EPROTO variant is covered in both Error::name() and the FetchTasklet message match, and the OpenSSL reason is copied into a Box<[u8]> before the handshake callback returns, so the stack-buffer pointer does not escape.
Extended reasoning...
The confirmed inline finding covers the proxy-tunnel gap. I additionally verified the enum-variant/struct-field fan-out that REVIEW.md calls out for this kind of change: every HTTPClientResult literal either gained tls_handshake_reason or falls through ..Default::default(), Error::name() and the FetchTasklet message switch both handle EPROTO, and handshake_failure_error clones reason_bytes() into an owned Box<[u8]> so the uSockets stack buffer is not borrowed past the callback. Nothing further to add; deferring so a human weighs the user-facing fetch error-shape change.
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Agreed on the proxy-tunnel note: the inner handshake runs through the Rust |
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Updated 4:26 PM PT - Sep 5th, 2026
❌ @robobun, your commit 72263cf has 3 failures in
🧪 To try this PR locally: bunx bun-pr 41447That installs a local version of the PR into your bun-41447 --bun |
… cover bun install The code and message now match node:tls's tlsHandshakeError: the OpenSSL reason string is the message and ERR_SSL_<REASON> the code, EPROTO only when the string does not parse. Drop the ProxyTunnel call sites: the tunnel's SSLWrapper only reports X509 verdicts, so the mapping is not reachable there.
robobun
changed the title
…#41455) ### Problem - `test/js/web/fetch/fetch.tls.test.ts` is red on darwin (build 110411, about one run in four): `mismatched cert fetch rejected with UNKNOWN_CERTIFICATE_VERIFICATION_ERROR`. - The churn fixture dials `localhost` with servers bound to `127.0.0.1` only. On macOS the listener-less `::1` leg can TCP self-connect: the kernel hands the socket the ephemeral port equal to its destination port, the SYN meets itself (simultaneous open), and the connect completes at once. That leg wins the address race and the client fails its handshake against its own ClientHello. ### Fix - The fixture listens dual-stack (`server.listen(0)`), so both `localhost` legs have a listener. The kernel never picks a bound port, so the self-connect cannot happen. The hostname check (`localhost` against a `wrong.example` cert) is unchanged. - Verified on a CI mini (`darwin-arm64-hardtack`, 4 concurrent `bun test fetch.tls.test.ts`): 6 failures in 28 runs before, 0 in 16 after. - The error code itself is wrong (a handshake cut short is not a certificate error). #41447 fixes that in `fetch()`. This PR is the test-only part so the darwin lanes stop failing now. ### Background - Happy eyeballs connects to every address of a hostname and keeps the first socket up. A self-connected leg is up immediately. - macOS draws connect and listen ephemeral ports from one range of 16384 ports, so the collision hits about 1 in 16384 listener-less legs. Linux draws odd ports for `connect()` and even ones for `bind(0)`, so it cannot collide. <details><summary>Notes</summary> Capture with `tcpdump -i lo0` during a failing run. Each failing fetch matched exactly one connection: ``` IP6 ::1.57002 > ::1.57002: Flags [S] (client port == server port 57002) IP6 ::1.57002 > ::1.57002: Flags [S.] IP6 ::1.57002 > ::1.57002: Flags [.] IP6 ::1.57002 > ::1.57002: Flags [P.] length 1496 (its own ClientHello) IP6 ::1.57002 > ::1.57002: Flags [P.] length 7 (TLS alert) IP6 ::1.57002 > ::1.57002: Flags [R.] IP 127.0.0.1.57003 > 127.0.0.1.57002: [S] [S.] [.] [R.] (the real leg, closed as the race loser) ``` A probe with `net.connect` to a port with no listener on that address: 3 self-connects in 60000 attempts. To a port with a listener on that address: 0 in 170000. </details> <!-- robobun:evidence:begin --> --- **no test proof** · iteration 0 · no src or test change; test-proof not applicable <!-- robobun:evidence:end -->
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Closing as superseded by #42692 (63a495c). Its One difference remains for a possible follow-up: this PR reported |
Fixes #31949
Problem
fetch()andbun installreport every TLS handshake that ends before a certificate verdict asUNKNOWN_CERTIFICATE_VERIFICATION_ERROR. About 70 darwin CI builds since Aug 26 show this code, and bun install: UNKNOWN_CERTIFICATE_VERIFICATION_ERROR against a registry that bun's own fetch(), curl, and npm all verify #31949 is a user sent through CA stores by it.-46ECONNRESET,-71EPROTO,openssl.c:1966,2020).Handler::on_handshakefed them into the X509 table (src/http/lib.rs:1543), whose fallback is the unknown-certificate code. A plain-HTTP server behind anhttps://URL gets it on every platform.Fix
HTTPClient::handshake_failure_error: codeECONNRESETbecomesConnectionClosed(fetch reportsECONNRESET, installConnectionClosed). Any other negative code becomes the newError::EPROTOwith the OpenSSL reason copied intotls_handshake_reason. Non-negative codes still use the X509 table.fetch()shapesEPROTOlike node:tls'stlsHandshakeError(src/js/node/net.ts:376): the message is the OpenSSL string and the codeERR_SSL_<REASON>(ERR_SSL_WRONG_VERSION_NUMBER),EPROTOonly when the string does not parse. One code per wire event across the binary.test/js/web/fetch/fetch.tls.test.ts(4 new tests) andtest/cli/install/bun-install-stalled-tls.test.ts(1 new test). Released bun fails all 5 withUNKNOWN_CERTIFICATE_VERIFICATION_ERROR. Also the wildcard, backpressure, proxy and serve-ssl suites.Background
on_handshakegetsus_bun_verify_error_t { error_no, code, reason }. For a finished handshakeerror_nois theX509_V_ERR_*verdict (0 to 67). For an unfinished one uSockets substitutes its negative codes and setscodeto the errno name.dns_hostnamepattern).SSLWrapper, which reports X509 verdicts only, so it is not touched here.Notes
Message and code shape before and after on linux with a plain TCP server that answers the ClientHello with HTTP:
With a server that FINs after the ClientHello:
ECONNRESET(fetch),error: ConnectionClosed downloading package manifest lodash(install). A server that RSTs already reported those (the reset raw-closes the socket before the SSL layer runs).Sightings: the Buildkite annotations of builds 106090 through 110411 contain
UNKNOWN_CERTIFICATE_VERIFICATION_ERRORin about 70 builds, all on darwin lanes:fetch.tls.test.ts(the churn fixture,fetch with valid tls should not throw,reuses the keep-alive connection ...),fetch.tls.wildcard.test.ts(many rows),fetch-backpressure.test.ts(stalled ... drains the full body, h1-tls),fetch-http3-client.test.ts(the h1 alt-svc fetch),serve-http3.test.ts.The churn-fixture failures are a macOS TCP self-connect on the listener-less
::1leg of alocalhostfetch, proven with tcpdump (details in #41455). The 127.0.0.1 sightings have a listener on the dialed address, so they are something else. 300 runs of those files under load on a CI mini did not reproduce them. One candidate, confirmed possible on macOS and impossible on Linux: a dual-stack[::]:0listener can land on a port that a v4-only127.0.0.1listener in another process already holds (1 in 20000 with 2000 v4-only listeners present), and a127.0.0.1connect then reaches the more specific v4-only socket. After this change such a failure reportsECONNRESETorERR_SSL_<REASON>instead of a certificate code, which names the actual peer behavior on the next sighting.The mapping bug dates to #17505 (Feb 2025), which added the
-46pseudo-code;-71came with #31155.Other suites run on the debug build:
fetch.test.ts(failures match the released binary: IPv6 localhost, root permissions, internet, GC-heavy timeouts),fetch-backpressure.test.ts(only the S3 block fails, egress denied, same on the released binary),bun-connect-x509.test.ts(internet). Full list:fetch.tls.wildcard,fetch-backpressure,proxy,bun-serve-ssl,tls-keepalive,fetch-abort-ssl-context-eviction,proxy-stress-errors,proxy-stress-protocol,fetch-abort-socket-close-race.Self-reviewed: 6 concerns raised, 5 addressed (code shape, dead proxy-tunnel hunks, duplicate PRs, missing issue link, fixture split). Rejected: teaching the proxy tunnel's
SSLWrapperthe same pseudo-codes, which needs its own tunnel test and is a separate change.no test proof · iteration 2 · platform-specific test(s) that do not run on this machine, deferring to CI, which covers all platforms: test/js/web/fetch/fetch.tls.test.ts