feat(openbao): pin 2.6.2, and correct the mlock and recovery-path claims

2.5.5 was two releases behind. Verified against the openbao/openbao source at
tag v2.6.2 that the bump is safe for an existing vault: raft's on-disk format
is unchanged (identical bbolt / hashicorp-raft / raft-boltdb pins,
byte-identical physical/raft/types.proto), snapshots restore in both
directions, and every stanza this config.hcl uses still parses -- the config
parser only moved import paths and the listener diff is additive.

Three corrections that came out of that check.

deploy.sh's printed crash-loop recovery command was already broken by 2.6.0.
That release adds `USER openbao` to the alpine image, so the container no
longer starts as root; the `docker run ... --entrypoint sh ... chown` it tells
the operator to run now executes as uid 100 and fails. Added `--user 0:0`, and
dropped the stale 2.5.5 literal from the same string. The detection logic
itself is unaffected -- `id -u openbao` still reads /etc/passwd and still
returns 100, verified by extracting the passwd layer from both published
images -- so a02524a holds and the volume does not need re-chowning.

The mlock story was wrong, and was already wrong on 2.5.5. OpenBao removed
mlock support: its own config parser carries "OpenBao has dropped support for
mlock. Please remove the line disable_mlock = false from your config and
disable or encrypt swap instead." So `cap_add: [IPC_LOCK]` and
`ulimits: memlock: -1` are inert, and config.hcl's "mlock keeps key material
off swap -- REQUIRED" was describing something that does not happen. The
BEHAVIOUR was right all along, because deploy.sh disables swap, which is the
actual mitigation; only the explanation was wrong. Corrected in config.hcl,
docker-compose.yml and the README. The two compose settings stay: they are
harmless, and removing them would recreate every deployed container for no
gain.

The built-in `seal "pkcs11"` stanza is deprecated in 2.6.0 for removal in
v2.7.0, and the HSM distribution is discontinued by then; PKCS#11 auto-unseal
continues only via the external `plugin "kms" "pkcs11" {}`. Noted where the
commented-out stanza lives, since a stack relying on it has to move before
taking 2.7.x.

Also worth recording and NOT acting on: do not switch to the openbao-distroless
image variant. It ships no shell, which breaks every `docker compose run
--entrypoint sh` probe deploy.sh uses.

Upgrading a LIVE vault is not automatic -- snapshot first, and the restart
comes back sealed. That is the next commit.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

deployments/openbao/.env.example

@@ -34,7 +34,7 @@ OPENBAO_UI=1
 
 # ─── Image tag ──────────────────────────────────────────────────────────────
 # Pin for reproducible deploys.
-OPENBAO_TAG=2.5.5
+OPENBAO_TAG=2.6.2
 
 # ─── Auto-unseal (optional; default is MANUAL unseal) ───────────────────────
 # Only used when the seal "pkcs11" stanza is enabled in config.hcl (and the HSM

deployments/openbao/README.md

@@ -3,7 +3,7 @@
 Hardened [OpenBao](https://openbao.org) — the tape-encryption key store for
 **Kanrisha** (the LTO tape-archive system; separate repo, separate host).
 Deliberately **separate from the tape host**: a compromise of the tape node must
-not reach the vault, and OpenBao's mlock/TLS/unseal lifecycle is cleaner on its
+not reach the vault, and OpenBao's TLS/unseal lifecycle is cleaner on its
 own box.
 
 Unlike the other stacks here there is **no Caddy / Let's Encrypt** — a secrets
@@ -13,7 +13,8 @@ internet.
 - **Native TLS** on the listener — self-signed by default, or a CA-signed cert
   from your Smallstep CA over ACME.
 - **Integrated raft storage** — snapshot-based DR.
-- **mlock on** — key material never hits swap.
+- **Swap disabled** — key material never hits disk. (Not mlock: OpenBao removed
+  mlock support, so `disable_mlock` must not appear in config.hcl at all.)
 - **Manual unseal by default**, or PKCS#11 HSM auto-unseal.
 
 > ⚠️ This vault is the **sole recovery path for encrypted tapes.** Losing the
@@ -41,7 +42,8 @@ OPENBAO_ADDR=10.0.0.10 SKIP_PROMPTS=1 bash deployments/openbao/deploy.sh
 ```
 
 `deploy.sh` installs Docker, generates a self-signed TLS cert (if none present),
-seeds `.env`, disables swap (for mlock), narrows the API bind to the LAN IP,
+seeds `.env`, disables swap (keeping key material off disk), narrows the API
+bind to the LAN IP,
 opens `8200/tcp`, aligns file/volume ownership to the container's UID, and brings
 the stack up. OpenBao starts **sealed** — initialise + unseal once (do this
 immediately; an uninitialised vault reachable on the LAN can be init'd by anyone

deployments/openbao/config.hcl

@@ -1,7 +1,7 @@
 # OpenBao — hardened, same-LAN tape-encryption key store for Kanrisha.
 #
 # Native TLS on the listener (no reverse proxy in front), integrated raft
-# storage (clean snapshot-based DR), and mlock enabled. This vault is the SOLE
+# storage (clean snapshot-based DR). This vault is the SOLE
 # recovery path for encrypted tapes — losing the OpenBao data AND the unseal
 # material loses every encrypted tape. Back it up (raft snapshots) and store the
 # unseal keys/root token out of band (see the README + DR runbook).
@@ -24,9 +24,13 @@ listener "tcp" {
   #   tls_client_ca_file                 = "/openbao/tls/client-ca.crt"
 }
 
-# mlock keeps key material off swap — REQUIRED. Needs cap_add: [IPC_LOCK] +
-# ulimits memlock unlimited (docker-compose.yml) and swap disabled on the host.
-# Do NOT add `disable_mlock = true`.
+# Keeping key material off disk is done by DISABLING SWAP (deploy.sh does this),
+# NOT by mlock. OpenBao removed mlock support: its own config parser carries the
+# message "OpenBao has dropped support for mlock. Please remove the line
+# \"disable_mlock\" = false from your config and disable or encrypt swap instead."
+# So do NOT add a disable_mlock line of either value -- `disable_mlock = false`
+# is a hard startup error. cap_add: [IPC_LOCK] and ulimits memlock in
+# docker-compose.yml are inert leftovers.
 
 # Single-node raft: advertising 127.0.0.1 is fine because a lone node is always
 # ACTIVE and never redirects clients (they connect straight to the LAN address).
@@ -42,6 +46,10 @@ cluster_addr = "https://127.0.0.1:8201"
 ui           = @UI@
 
 # ── Auto-unseal (optional) — DEFAULT IS MANUAL UNSEAL ────────────────────────
+# DEPRECATED: the BUILT-IN pkcs11 seal below is removed in OpenBao v2.7.0, and
+# the HSM distribution is discontinued by then. PKCS#11 auto-unseal continues
+# via the external KMS plugin (`plugin "kms" "pkcs11" {}`), so a stack that
+# needs it must move before taking 2.7.x.
 # With no seal stanza OpenBao starts SEALED and needs `bao operator unseal` (x3)
 # after every restart. To auto-unseal against a PKCS#11 HSM/token, uncomment and
 # fill this in, mount the PKCS#11 module + device into the container, and set

deployments/openbao/deploy.sh

@@ -414,7 +414,7 @@ if [[ -z "$BAO_UID" ]]; then
     warn "If OpenBao crash-loops with a permission error on /openbao/data, run:"
     warn "    cd ${STACK_DIR} && docker compose down"
     warn "    docker run --rm -v openbao_openbao-data:/data -v ${STACK_DIR}/tls:/tls \\"
-    warn "      --entrypoint sh openbao/openbao:\${OPENBAO_TAG:-2.5.5} -c 'chown -R openbao:openbao /data /tls'"
+    warn "      --user 0:0 --entrypoint sh openbao/openbao:\${OPENBAO_TAG:-2.6.2} -c 'chown -R openbao:openbao /data /tls'"
     BAO_UID=0
 fi
 log "OpenBao server runs as UID ${BAO_UID}; aligning file/volume ownership."
@@ -525,76 +525,82 @@ fi
 # __ARCHIVE_BELOW__ is the embedded tar.gz payload (base64), added by build.sh.
 exit 0
 __ARCHIVE_BELOW__
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deployments/openbao/docker-compose.yml

@@ -15,12 +15,15 @@ volumes:
 
 services:
   openbao:
-    image: openbao/openbao:${OPENBAO_TAG:-2.5.5}
+    image: openbao/openbao:${OPENBAO_TAG:-2.6.2}
     container_name: openbao
     command: server -config=/openbao/config/config.hcl
     restart: unless-stopped
-    # mlock: keep key material off swap. IPC_LOCK + unlimited memlock let the
-    # process lock its memory; the HOST must also have swap disabled.
+    # These two are INERT. OpenBao dropped mlock support entirely, so nothing in
+    # the container locks memory and `disable_mlock = false` in config.hcl is a
+    # hard startup error. They are kept only because they are harmless and
+    # removing them would recreate every deployed container for no gain.
+    # Key material is kept off disk by DISABLING SWAP, which deploy.sh does.
     cap_add:
       - IPC_LOCK
     ulimits: