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shankar0123
87e0009d97
Closes Bundle 8 of the 2026-05-02 deployment-target coverage audit
(see cowork/deployment-target-audit-2026-05-02/RESULTS.md). Pre-fix,
DeployCertificate at javakeystore.go:172-272 ran an irreversible
keytool -delete against the existing alias, then keytool
-importkeystore. If the import failed after the delete succeeded,
the keystore was missing the alias entirely — previous cert gone,
new cert never landed. docs/deployment-atomicity.md L94 promised
"keytool snapshot; rollback via keytool -delete + re-import"; the
code didn't deliver. Separately, the operator-facing keystore
password is passed via -storepass argv (a standard keytool
limitation) which is visible to ps(1) for the duration of each
subprocess; this was undocumented as an operator-playbook caveat.
This commit:
1. Pre-delete snapshot. When os.Stat(KeystorePath) succeeds,
snapshotKeystore runs keytool -exportkeystore to
<BackupDir>/.certctl-bak.<unix-nanos>.p12 BEFORE the existing
-delete step. Backup path persisted in a local variable for
the rollback path; export-step failure aborts the deploy
entirely (no mutation has happened yet — the keystore is
untouched). Snapshot skipped on first-time deploys (no
keystore file = nothing to roll back to). The "alias not
present in pre-existing keystore" case is recognised via the
well-known keytool error string and treated as a clean
first-time-on-existing-keystore signal — the deploy proceeds
without a backup, and rollback (if needed) becomes the
no-backup branch.
2. On-import-failure rollback. When keytool -importkeystore
returns error, rollbackImport(ctx, backupPath) runs:
- keytool -delete -alias <Alias> ... (best-effort; the failed
import may have created a partial alias entry).
- keytool -importkeystore from the backup PKCS#12 to restore
the previous state.
On rollback success, the deploy returns wrapped error noting
"rolled back from <backup_path>". On rollback failure,
returns operator-actionable wrapped error containing both the
import error AND the rollback error AND the backup path so
the operator can manually keytool -importkeystore from the
.p12 file to recover.
3. Backup retention. Successful deploys prune older
.certctl-bak.*.p12 files beyond Config.BackupRetention.
Sort by ModTime newest-first; keep most recent N. Defaults:
BackupRetention=0 → keep most recent 3 (the default).
BackupRetention=N → keep most recent N.
BackupRetention=-1 → opt out of pruning entirely (operators
that wire their own archival/rotation).
Pruning runs in the success path AFTER the optional reload
command so it doesn't interfere with deploy-time signals.
ReadDir / Remove failures are non-fatal (debug log only) —
the deploy already succeeded.
4. Config gains BackupRetention int and BackupDir string fields.
BackupDir defaults to filepath.Dir(KeystorePath) so backups
land on the same filesystem as the keystore (atomic-ish
writes, disk-full failures fail fast at snapshot time).
5. Helper extraction. snapshotKeystore + rollbackImport +
pruneBackups + backupDir are private methods on Connector.
Constants backupFilePrefix=".certctl-bak." and
backupFileSuffix=".p12" centralise the naming convention so
the snapshot writer, the rollback reader, and the retention
pruner all agree.
6. Operator-playbook section added to docs/connectors.md
JavaKeystore section. Documents the standard keytool
-storepass argv exposure: ps(1)-visible for the duration
of each subprocess. Lists mitigations:
- Restrict shell access to the agent host.
- Linux user namespaces / AppArmor / SystemD ProtectProc=
invisible to deny ps-visibility.
- Single-purpose container for proper PID-namespace
isolation.
- Post-deploy keystore password rotation via reload_command
for high-security environments.
- BCFKS keystore type for FIPS environments (same argv
caveat applies).
Also documents an "Atomic rollback" subsection covering the
snapshot/rollback flow, the new backup_retention /
backup_dir Config fields, and the design choice to reuse
the keystore password for the snapshot (rather than
generating a separate transient password) — operator
already trusts the connector with this secret, surface area
doesn't grow, rollback's matching -srcstorepass stays
simple.
Tests added to javakeystore_test.go (7 new tests, ~430 LOC):
- TestJKS_Snapshot_RunsBefore_Delete: mock executor records call
order; asserts -exportkeystore is call[0], -delete is call[1],
-importkeystore is call[2]. The snapshot MUST run before the
delete — otherwise the delete destroys the very state the
snapshot is meant to capture.
- TestJKS_Snapshot_FirstTimeDeploy_NoExport: no keystore file
pre-created; asserts exactly 1 keytool call (-importkeystore
only), no -exportkeystore.
- TestJKS_ImportFails_RollsBack: happy rollback path with one
same-Subject backup. Asserts rollback re-import references the
same backup path the snapshot wrote (verified via arg
comparison between call[0] and call[4]).
- TestJKS_ImportFails_RollbackAlsoFails_OperatorActionable:
wrapped-error escalation with backup path in the error
message.
- TestJKS_BackupRetention_PrunesOldBackups: 5 pre-existing
staggered-ModTime backups + 1 deploy-created → retention=3 →
exactly 3 newest survive (deploy-created + 2 newest
pre-existing); 3 oldest pre-existing pruned.
- TestJKS_BackupRetention_Zero_DefaultsTo3: BackupRetention=0
must default to 3 (not "keep none").
- TestJKS_BackupRetention_Negative_OptsOut: BackupRetention=-1
pre-existing 5 + deploy 1 = 6 total, all 6 remain.
- TestJKS_Snapshot_AliasNotInKeystore_ProceedsCleanly: keystore
exists but alias missing; -exportkeystore returns "alias does
not exist" → snapshot helper recognises this signal and
returns ("", nil) so the deploy proceeds cleanly.
mockExecutor extended with optional `onCall` hook so the
retention-pruning tests can simulate keytool -exportkeystore's
file-write side effect (via the simulateExportSideEffect helper
that parses -destkeystore from args and writes a placeholder
.p12 file). Existing tests that don't set onCall behave
identically to before — backward compatible.
docs/deployment-atomicity.md L94 unchanged from today's text —
Bundle 1 doc-realignment hasn't shipped, so the "keytool snapshot;
rollback via keytool -delete + re-import" line was never softened.
Post-Bundle-8 the claim is honest (was aspirational pre-fix).
Verified locally (sandbox lacks staticcheck install due to disk
pressure; CI runs the full lint gate):
- gofmt -l ./internal/connector/target/javakeystore/ clean
- go vet ./internal/connector/target/javakeystore/ clean
- go build ./cmd/agent/... clean
- go test -race -count=1 ./internal/connector/target/javakeystore/
green (16 tests total: 9 pre-existing + 7 new)
Audit reference: cowork/deployment-target-audit-2026-05-02/RESULTS.md
Bundle 8.