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fetch: set up TLS once per connection, not once per request - #44507
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The SNI, ALPN, inline-reject and session setup ran from on_open, which also runs for a socket reused from the keep-alive pool, behind an SSL_is_init_finished() == 0 check. That check is also 0 while a pooled socket renegotiates, so the setup ran again and SSL_set_session was called after a handshake had begun. BoringSSL aborts the process on that call. The setup now runs from on_connect, the open callback of a new connection, and a pooled pickup does no TLS work.
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Status Reproduced on bun 1.4.3-canary.1 (linux x64) with the test in this PR. PR: #44507 |
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Two notes from the review of the combined change, made before this fix was split out of #41671. Both still apply to this head (0d6c02e). Check them before you act on them.
The other points of that review are already in this PR: the stall under Downsides with the link to #37094, and the two comments that named |
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Updated 6:20 AM PT - Oct 3rd, 2026
✅ @robobun, your commit 8ac1df24c3951f63d9c58b9efdeb16e48bf73914 passed in 🧪 To try this PR locally: bunx bun-pr 44507That installs a local version of the PR into your bun-44507 --bun |
on_connect calls the helper after on_open, so the block and the keepalive comment stay where they were. The test gains a todo for the request that takes the renegotiating socket: its write parks, and it gets no answer until uSockets retries it.
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Included review availability: This review used your included allowance. Your plan provides up to 10 included reviews per hour; 5 remain after this review. WalkthroughTLS setup now runs after ChangesTLS Renegotiation Handling
Suggested reviewers: Priority: ➖ Normal Merge Risk: ⚪ Minimal · up to The change moves TLS setup to once per new connection, which should prevent the reported abort when a pooled connection is renegotiated. No merge-blocking risk was identified in the supplied changes. 🚥 Pre-merge checks | ✅ 4✅ Passed checks (4 passed)
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Actionable comments posted: 2
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Inline comments:
Review comments at @test/js/web/fetch/fetch.tls.test.ts:
- Around line 583-602: Remove the explicit timeout argument from the `it.skipIf`
test for pooled socket renegotiation, leaving `!nodeExe()` as its only skip
condition. Also remove the explicit timeout from the nearby `it.todo` call; rely
on Bun’s test timeout behavior.
- Around line 566-567: Update the peer stdout reading near the
`peer.stdout.getReader().read()` call to accumulate decoded chunks until the
first newline, then parse the complete first line into `ports`. Detect an
undefined chunk or stream completion before the newline and fail clearly instead
of decoding an empty string.
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src/http/ProxyTunnel.rssrc/http/lib.rstest/js/web/fetch/fetch.tls.renegotiation-client-fixture.tstest/js/web/fetch/fetch.tls.renegotiation-peer-fixture.mjstest/js/web/fetch/fetch.tls.test.ts
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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 findings, I also checked whether uSockets can drive a handshake step before the open callback returns, which would make the dropped SSL_is_init_finished guard load-bearing for new connections — it cannot: us_internal_ssl_on_open in packages/bun-usockets/src/crypto/openssl.c:2225-2229 calls ssl_update_handshake only after us_dispatch_open returns, so the reworded SAFETY comment on session_cache::install holds for the on_connect path.
Extended reasoning...
The change moves fetch's per-socket TLS setup (SNI/ALPN/inline reject/session offer) from the per-request on_open into a new configure_tls called only from the uSockets open callback in src/http/lib.rs, plus a comment update in ProxyTunnel.rs and a new Node-peer renegotiation test. It touches TLS verification setup (set_inline_reject for rejectUnauthorized) and the TLS session cache. The inline findings, in particular the non-SSL on_connect path now reborrowing self after on_open's first_call can free it via preconnect dispatch, mean a human should look before merging.
on_open starts the request on a plain socket, and that can free the client, so on_connect must not touch it afterwards. The test reads the whole first line of the peer, and the peer answers the control request when a renegotiation does not start.
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The latest push (8ac1df2) addresses both points from my earlier review, and this pass found no new bugs; since the change removes a guard on the TLS client setup path (SNI, ALPN, inline reject, cached-session offer), a human look is still worthwhile.
What was reviewed:
on_connectnow callsconfigure_tlsonly whenIS_SSL, soselfis not touched afteron_opencan free it on a plain socket; the three pool-reuse sites in HTTPContext.rs still call onlyon_open+first_call, so the setup no longer runs on a pooled socket.- The abort early-return in
on_openstill skipsconfigure_tlsvia?, matching the old ordering (timeout armed, abort checked, then TLS setup). - The peer fixture's
/renegotiatenow answers on a refused/errored/closed renegotiation, and the test reads the full first stdout line before parsing ports.
Extended reasoning...
The diff moves the per-connection TLS setup out of HTTPClient::on_open (run per request, including pool reuse) into a new configure_tls called only from the uSockets open callback on_connect, dropping the SSL_is_init_finished guard that let a mid-renegotiation pooled socket re-run SSL_set_session and abort the process. It touches the fetch TLS client path, including reject_unauthorized inline reject and the TLS session cache, which is security-sensitive surface. The source change is small and the control flow checks out against all callers, and the new commit fixed the dangling-self and unanswered-control-request issues raised earlier; a Node-driven fixture reproduces the crash and verifies the cached session survives. No findings this run and no CODEOWNER covers these files, but the TLS-path guard removal is why a human should also look rather than approve outright.
Import oven-sh#44507 as an additional merge, retaining both histories. Keep the published OpenClaw WebKit pin and fork default-CA regression coverage unchanged.
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Problem
fetch()twice. It renegotiates on the idle keep-alive connection, and the next request that takes the pooled socket dies:panic: abort() called, stackSSL_set_session<-session_cache::install<-HTTPClient::on_open. Regression in 1.4.0.on_open(src/http/lib.rs) runs per request. Its TLS setup was guarded bySSL_is_init_finished(ssl) == 0, also true during a renegotiation, so it offered the cached session again. BoringSSL aborts on that.Fix
configure_tls. Onlyon_connectcalls it, the open callback of a new connection. The guard is gone.test/js/web/fetch/fetch.tls.test.ts(new test, fails on 1.4.3-canary). Also ran the fetch-keepalive, fetch-session, proxy and tls renegotiation suites.Background
SSL_set_sessionoffers it, legal only before a handshake starts.session_cache::installand a check at pool pickup. Both leave per-connection work on the per-request path.Downsides
todotest records it.Notes
How to reach it. No user code is needed beyond two
fetch()calls to one HTTPS origin with verification on (the default). The server decides the rest. It does not have to withhold anything: a server that answers and then callsrenegotiate()is enough when the second request starts inside the renegotiation. A server that never finishes the renegotiation keeps the window open for as long as it likes.Why the guard was wrong.
SSL_in_init()is true whenever a handshake object exists and is not finalized. That covers the time before the first handshake step and the whole of a renegotiation. uSockets allows a client renegotiation (ssl_renegotiate_explicit) and runs it from itsSSL_readloop, so the pool's idle data handler never sees the HelloRequest and the socket stays parked while it renegotiates.What else the old block did to a renegotiating pooled socket. It set SNI and ALPN again.
session_cache::installtook the cached session out of the cache before it offered it, so the next new connection could not resume. It replaced the armed session sink with an unarmed one. The new test checks the second point: after the pooled pickup, a new connection still resumes the cached session.The test.
fetch.tls.renegotiation-peer-fixture.mjsruns under Node, because BoringSSL cannot send a HelloRequest. It is a TLS 1.2 keep-alive origin behind a TCP relay that can hold the client's bytes, plus a plain HTTP control server. The client fixture parks a connection, asks the origin to renegotiate, and gets the answer only when the relay holds the client's renegotiation ClientHello. Then it starts the request that takes the pooled socket. A control request queued behind it on the HTTP thread proves that the pickup ran. The test uses no timer.Measured, linux x64.
367d939d9), release: the new test fails. The client printspanic: abort() calledat the pooled pickup.468efacacewithout the change: the client exits with SIGABRT at the pooled pickup.fetch.tls.test.ts(62 pass, 1 todo),fetch-keepalive.test.ts(49),fetch-session.test.ts(34),test/js/bun/http/proxy.test.ts(97) andtest/js/node/tls/renegotiation.test.ts(21) pass. With--todo, the todo test times out, as expected.fetch-keepalive.test.tsneeded a second run with a longer per-test timeout: four tests hit the 5 s limit on the loaded build machine.80de08a1dbaborts in 13 of 15 runs. This branch aborts in 0 of 15.What stays. In 12 of those 15 runs on this branch the second request does not get an answer. The server reports that the renegotiation ended, and the request ends in a timeout. (Of the other 3, one got its answer and two failed with
EPROTO, which main also shows in this cell.) The request write parks while the handshake runs, and uSockets dispatches the writable event only in itsHANDSHAKE_COMPLETEDstate, which a renegotiation leaves until application data arrives. That is a separate defect inpackages/bun-usockets/src/crypto/openssl.c, and #37094 has a fix for it. It does not come from the session cache: it also occurs withBUN_FEATURE_FLAG_DISABLE_FETCH_TLS_SESSION_CACHE=1. The todo test next to the new test awaits that request, so it flips when the write is retried.Cost numbers. Release builds of main
80de08a1dband of this branch's source on the same commit.Trampolines<uws_handlers::HTTPClient<true>>::on_open): 1,427 on main, 1,415 here. All 9 calls of each build agree.HTTPContext<true>::connectfor a pooled TLS request, sixth request of the process: 5,146, 5,160, 5,146 on main and 5,123, 5,118, 5,123 here. Later requests vary more from run to run: 6,617 to 6,762 on main, 6,585 to 6,723 here.session_cache::installcalls: 1 per 1,000 keep-alive requests and 100 per 100 new connections, on both builds.bun-profiletext is 80,727,274 bytes on main and 80,728,298 here (+1,024). The strippedbunis 80,868,936 bytes on both. Symbols:HTTPClient::on_open::<true>1,474 to 280 bytes,HTTPContext<true>::connect5,283 to 5,798, the open callback 375 to 1,582. The TLS block is now part of the open callback, and the compiler inlines the smalleron_openat the three pool reuse sites.llvm-nm,llvm-size.perf,valgrindandbloatyare not installed on the machine.Related. #41671 covers the other way into the same BoringSSL abort,
socket.setSession()after the handshake started. This change does not depend on it.Other designs.
session_cache::install: it stops the abort, but the cached session is still taken out of the cache and the sink is still replaced.on_open: BoringSSL has no query for "the handshake has not started", so it needs a uSockets accessor or new per-socket state, and one branch stays on every pooled request.on_openis not reached with such a socket. It also changes which requests reuse a connection.Not run locally. Windows and macOS.