fix(dashmate): deliver renewed certificates to the running gateway - #4421
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The gateway certificate and key are bind-mounted into the container as
individual files. A file bind mount follows the inode, not the path, so a
certificate installed by writing a replacement and renaming it over the old
file never reaches a running gateway: the container keeps reading the inode
it mounted at startup, and the mount itself holds that inode alive. Envoy
would go on serving the previous certificate until it expired, with both
files on disk looking current and nothing in the renewal path recreating
the container.
Install the pair in place again so the inode the container holds is the one
that receives the renewal.
The replaced install guarded against a torn write during renewal. Concurrent
writers - the scheduled renewal and a manual obtain - are already serialized
by the configuration lock, which spans the whole obtain on both paths, so
what remained was an unclean shutdown landing inside a sub-millisecond write
that happens once every few days. Against that, the delivery failure was
silent, affected every node, and needed an operator to recreate a container
to clear. The private key permission repair is kept, with the owner write
bit restored around the write so a key hardened to 0400 can still be
replaced.
Also reload the gateway after `dashmate ssl obtain`. Only the scheduled
renewal ever signalled Envoy, so an operator could run the command dashmate
points them to, see it succeed, and find nothing changed on the wire. The
reload is skipped when the certificate was already current or the gateway
is not running.
Tests, red before the change and green after:
should install a renewal into the files the gateway already has mounted
AssertionError: expected 422747267 to equal 422747265
should reload the gateway after obtaining a certificate
AssertionError: expected stub to have been called exactly once with
arguments { get: [Function: functionStub] }, 'gateway', 'kill -SIGHUP 1'
The inode assertion pins the property the bind mount depends on, so a future
atomic-install change cannot silently reintroduce this.
Note on scope: the inode behaviour of the write is demonstrated by the test
above, but that a container's file bind mount then goes stale on Linux was
reasoned from the mount semantics, not measured against a running gateway.
The specs covering the removed temp-file rollback and cleanup are dropped
with the code they exercised.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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Included review availability: Your plan provides up to 3 included reviews per hour; 0 remain after this review. 📝 WalkthroughWalkthroughThe SSL obtain flow writes renewed certificate files in place. When the gateway is active, the flow sends ChangesSSL certificate renewal
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: 🟡 Moderate · up to Renewals now update the mounted certificate files in place and reload the running gateway, but an interrupted update can leave the certificate and private key inconsistent and may temporarily weaken hardened key permissions. This bounded failure mode needs explicit owner acceptance or mitigation before merge. Sequence Diagram(s)sequenceDiagram
participant ObtainCommand
participant CertificateProvider
participant dockerCompose
participant Gateway
ObtainCommand->>CertificateProvider: acquire certificate
CertificateProvider-->>ObtainCommand: certificate acquired
ObtainCommand->>dockerCompose: check gateway service status
dockerCompose-->>ObtainCommand: gateway running or stopped
ObtainCommand->>dockerCompose: execCommand("kill -SIGHUP 1")
dockerCompose->>Gateway: send SIGHUP to process 1
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thepastaclaw
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Aug 19, 2026
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Preliminary review — Codex only
The in-place certificate writes preserve the bind-mounted inodes, but the new reload step does not work for the supported ZeroSSL flow and cannot recover from a previously failed reload. Because those paths can still report success while the running gateway serves the stale certificate, changes are required.
Source: reviewers codex general (gpt-5.6-sol) and codex security-auditor (gpt-5.6-sol); final verifier codex (gpt-5.6-sol). openclaw-agent/cliproxy/gpt-5.6-sol was orchestration-only and is not reviewer evidence.
Validated blockers were found in the Codex precheck. Opus is deferred until a fresh Codex revalidation clears the blocker gate.
Review provenance
- Codex reviewers:
gpt-5.6-sol— general (completed),gpt-5.6-sol— security-auditor (completed) - Verifier:
gpt-5.6-sol— verifier - Sonnet: not run (deferred by blocker gate)
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These findings are from an automated code review. Verify each finding against the current code and only fix it if needed.
In `packages/dashmate/src/commands/ssl/obtain.js`:
- [BLOCKING] packages/dashmate/src/commands/ssl/obtain.js:98-107: Do not gate the gateway reload on the transient save marker
The reload only runs when `ctx.certificateSaved` was set by `saveCertificateTask`, but the ZeroSSL pipeline writes `private.key` and `bundle.crt` directly in `obtainZeroSSLCertificateTaskFactory.js` and never sets this property. A successful `dashmate ssl obtain --provider=zerossl` therefore skips the reload and leaves a running Envoy serving its previously loaded certificate. The transient marker also prevents recovery after a Let's Encrypt reload failure: once the pair has been written, a normal retry sees it as installed, does not set the marker, and reports success without retrying SIGHUP. The on-disk comparison cannot determine which certificate Envoy currently has loaded, so reload every running gateway after a successful obtain, or persist reload-pending state durably.
…a write
The reload was gated on a marker set by saveCertificateTask, which two paths
never reach.
ZeroSSL does not use saveCertificateTask at all - it writes the bind-mounted
pair itself - so a successful `dashmate ssl obtain --provider=zerossl` skipped
the reload entirely and left Envoy on its previously loaded certificate.
The marker is also transient, so it could not recover a failed reload. Both
providers skip the write once the pair is on disk, so re-running the command
after a reload failure set no marker, sent no signal, and reported success.
That is the same "command succeeds, wire unchanged" failure the reload was
added to fix, reached from the other side.
Nothing on disk reveals which certificate a running Envoy holds, so reload
whenever the gateway is up. This costs a hot restart on an obtain that changed
nothing, and in exchange the command becomes idempotent: running it again is
how an operator retries a reload that failed.
The marker is dropped from saveCertificateTask, where it now has no reader.
Tests, red before the change and green after:
should reload the gateway after obtaining a certificate
should reload the gateway after obtaining a ZeroSSL certificate
should reload the gateway when the certificate was already installed
AssertionError: expected stub to have been called exactly once with
arguments { get: [Function: functionStub] }, 'gateway', 'kill -SIGHUP 1'
The ZeroSSL case pins the reported defect; the third pins recovery, and
replaces an earlier test that asserted the opposite.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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Inline comments:
In `@packages/dashmate/src/listr/tasks/ssl/saveCertificateTask.js`:
- Around line 38-58: The saveCertificateTask flow around fs.writeFileSync and
fs.chmodSync must preserve atomicity: read and retain the existing
certificate/key contents and modes before modifying either file, then restore
both files and their original modes if any later key write or chmodSync fails.
Ensure a previously 0400 key is also restored to 0400, and add tests covering
key-write failure and final chmodSync failure.
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packages/dashmate/src/commands/ssl/obtain.jspackages/dashmate/src/listr/tasks/ssl/saveCertificateTask.jspackages/dashmate/test/unit/commands/ssl/obtain.spec.jspackages/dashmate/test/unit/ssl/saveCertificateTask.spec.js
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Writing the key in place needs the owner write bit, which an owner who
hardened the key to 0400 has removed, so the mode is loosened for the write
and restored after it. A write that threw skipped the restore and left the
key readable and writable by its owner rather than read-only.
Restore in a finally block so the chosen mode is put back on both paths.
Test, red before the change and green after:
should keep a hardened private key mode when the write fails
AssertionError: expected 384 to equal 256
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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Aug 19, 2026
#4421 landed the same gateway reload in `dashmate ssl obtain`, so the version on this branch is dropped in favour of it. Its reasoning is kept verbatim, and the one difference retained is how a stopped gateway is handled. The merged task asked whether the gateway was running and then signalled it. `DockerCompose.execCommand` makes that check itself and throws, so the two answers can disagree, and by that point the certificate has already been obtained — reporting the whole command as failed would send an operator back to a provider that may have nothing left to issue. The gateway is now signalled directly and only a stopped-service failure is treated as nothing to reload; any other error still fails the command, which is covered by a new test. The upstream spec is kept whole, including the ZeroSSL and already-installed cases this branch did not have. Suite: 333 passing.
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Issue being fixed or feature implemented
Renewed gateway certificates could stop reaching a running Envoy.
bundle.crtandprivate.keyare bind-mounted into the gateway container asindividual files:
A file bind mount follows the inode, not the path. Since #4248 the certificate
was installed by writing a replacement file and renaming it over the old one,
which by definition creates a new inode and moves the name onto it. The running
container stays pinned to the inode it mounted at startup — and the mount itself
keeps that inode alive — so the renewal never becomes visible inside the
container. Envoy uses static
tls_certificatesfilenames with no SDS, the onlyrefresh in the renewal path is
kill -SIGHUP 1, and nothing recreates thecontainer. A
SIGHUPtherefore re-reads the same stale file.The failure is silent: both files on disk are current, so
isCertificatePairInstalled(which compares two on-disk files) sees nothing wrong. The node would serve the
previous certificate until it expired.
Separately,
dashmate ssl obtainnever reloaded the gateway at all — only thescheduled renewal signalled Envoy. An operator could run the command dashmate
points them to, see it report success, and find nothing changed on the wire.
That one is independent of #4248 and is present today on every version.
What was done?
Install the certificate pair in place again, so the inode the container holds
is the one that receives the renewal. This removes the temp-file apparatus added
in #4248 from
saveCertificateTask: temp-file sweeping, thegraceful.on('exit')cleanup hook, the rollback path, and the certificate mode juggling.
What that apparatus protected against was a torn write during renewal. Concurrent
writers — the scheduled renewal and a manual
ssl obtain— are already serializedby the configuration lock introduced in the same PR, which spans the whole obtain
on both paths (
renewCertificate.jsacquires it;ObtainCommandsetsmutatesConfig = true). What remained was an unclean shutdown orENOSPClandinginside a sub-millisecond write that happens once every few days. Weighed against a
delivery failure that is silent, affects every node, and needs a container
recreate to clear, that trade did not hold up.
Kept from #4248:
& 0o700), which fixes keys left group- andworld-readable by older installs
Writing in place cannot open a key an owner hardened to
0400— rename sidesteppedthat by never touching the existing file — so the owner write bit is restored around
the write and the chosen mode put back straight after. Without this, renewal would
have begun failing with
EACCESon hardened nodes.Reload the gateway after
dashmate ssl obtain. Skipped when the certificate wasalready current, and when the gateway is not running, so first-time setup before
dashmate startis unaffected.How Has This Been Tested?
Two regression tests, red before the change and green after.
saveCertificateTask.spec.js— pins the property the bind mount depends on:obtain.spec.js— pins the missing reload:The inode assertion is the durable one: a future atomic-install change cannot
reintroduce this without the suite going red and explaining why.
Full dashmate unit suite: 291 passing. Lint clean (0 errors).
Scope of what was verified. The test demonstrates that the previous install
created a new inode. That a container's file bind mount then goes stale was
reasoned from Linux mount semantics (moby/moby#6011) rather than measured against
a running gateway container. A containerised check comparing
stat -c %ion the host againststat -c %iinside the gateway would close thatgap and is worth doing, but the fix does not depend on it: writing in place is
the behaviour every currently healthy node on 4.1.x is already running.
Breaking Changes
None. No configuration, template or compose changes, so no config migration and
no different behaviour for an operator mid-upgrade.
Note that
4ada750769is in no released tag — it exists only onv4.2-devandhas never run in production. Restoring the in-place write returns this path to
the code currently running across the fleet.
Checklist:
For repository code-owners and collaborators only
Summary by CodeRabbit
New Features
Bug Fixes