feat(gitea): trust the OpenBao SSH CA (phase 3b)

Step A is verified: Secret gitea-ssh-ca holds exactly the CA key
(SHA256:xEhuqx..., one line, 81 bytes like OpenBao's content-length),
so the webhook provider passes a text/plain body through unchanged.

- StatefulSet: SSH_TRUSTED_USER_CA_KEYS from the Secret,
  SSH_AUTHORIZED_PRINCIPALS_ALLOW=username. The built-in SSH server
  looks a cert's principals up as principal keys, so each user
  registers their username once as a principal.
- ExternalSecret: trim the trailing newline before it reaches app.ini.
- Reloader annotation: Gitea reads env only at start, so a CA rotation
  restarts it. The step A comment claimed the refresh alone reaches
  Gitea; corrected.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

ansible/inventory/pve_hosts.yml

@@ -77,3 +77,4 @@ claude-ws ansible_host=10.3.40.78 ansible_user=root
 proxy-1.renner.uno
 proxy-2.renner.uno
 netbird.renner.uno
+edge-1.iot.renner.uno

ansible/roles/ssh-ca/tasks/main.yml

@@ -127,13 +127,24 @@
       - "'revokedkeys /etc/ssh/revoked_keys' in ssh_ca_effective_lines"
     fail_msg: "sshd -T does not show the SSH CA settings; another config line takes precedence"
 
-# The unit is sshd.service on Arch and RedHat, ssh.service on Debian. sshd -T
-# only parses the files, so the running daemon is reloaded on every run; a
-# reload keeps open sessions.
+# The unit is sshd.service on Arch and RedHat, ssh.service on Debian/Ubuntu.
+# Ubuntu also lists sshd.service as a not-found alias, so the running one is
+# picked. sshd -T only parses the files, so the running daemon is reloaded on
+# every run; a reload keeps open sessions.
 - name: Read the service list
   ansible.builtin.service_facts:
 
-- name: Reload sshd so the running daemon uses the CA config
-  ansible.builtin.systemd:
-    name: "{{ 'sshd.service' if 'sshd.service' in ansible_facts.services else 'ssh.service' }}"
-    state: reloaded
+- name: Reload the running sshd unit
+  vars:
+    ssh_ca_sshd_units: "{{ ansible_facts.services | dict2items | selectattr('key', 'in', ['sshd.service', 'ssh.service']) | selectattr('value.state', 'equalto', 'running') | map(attribute='key') | list }}"
+  block:
+    - name: Check exactly one sshd unit is running
+      ansible.builtin.assert:
+        that:
+          - ssh_ca_sshd_units | length == 1
+        fail_msg: "Expected one running sshd.service or ssh.service, found {{ ssh_ca_sshd_units }}"
+
+    - name: Reload sshd so the running daemon uses the CA config
+      ansible.builtin.systemd:
+        name: "{{ ssh_ca_sshd_units | first }}"
+        state: reloaded

kubernetes/apps/gitea/kustomization.yaml

@@ -16,6 +16,8 @@ resources:
   - networkpolicy.yaml
   # Nightly prune of old CI image builds (REN-1203).
   - package-retention.yaml
+  # OpenBao SSH CA public key for certificate logins.
+  - ssh-ca.yaml
   - kumamonitors.yaml
 configMapGenerator:
   - name: gitea-package-retention

kubernetes/apps/gitea/ssh-ca.yaml

@@ -0,0 +1,37 @@
+# Public key of the OpenBao SSH user CA (ssh-client-signer), for Gitea's
+# built-in SSH server to accept owner and claude-bot certificates. OpenBao
+# serves it unauthenticated; ESO reads it from the in-cluster Service, so the
+# key has one source. Gitea reads it from env at start; Reloader restarts the
+# StatefulSet when the Secret changes.
+apiVersion: external-secrets.io/v1
+kind: SecretStore
+metadata:
+  name: openbao-ssh-ca
+  namespace: gitea
+spec:
+  provider:
+    webhook:
+      url: http://openbao.openbao.svc.cluster.local:8200/v1/ssh-client-signer/public_key
+      method: GET
+---
+apiVersion: external-secrets.io/v1
+kind: ExternalSecret
+metadata:
+  name: gitea-ssh-ca
+  namespace: gitea
+spec:
+  refreshInterval: 1h
+  secretStoreRef:
+    kind: SecretStore
+    name: openbao-ssh-ca
+  target:
+    name: gitea-ssh-ca
+    # OpenBao ends the body with a newline; it must not reach app.ini.
+    template:
+      engineVersion: v2
+      data:
+        trusted-user-ca-keys: "{{ .ca | trim }}"
+  data:
+    - secretKey: ca
+      remoteRef:
+        key: public_key

kubernetes/apps/gitea/statefulset.yaml

@@ -5,6 +5,9 @@ metadata:
   namespace: gitea
   labels:
     app.kubernetes.io/name: gitea
+  annotations:
+    # A CA rotation changes gitea-ssh-ca; Gitea reads it only at start.
+    secret.reloader.stakater.com/reload: gitea-ssh-ca
 spec:
   serviceName: gitea
   replicas: 1 # SQLite => single writer. Do NOT scale up without moving to Postgres first.
@@ -85,6 +88,16 @@ spec:
             # HAS CHANGED". Paths are relative to APP_DATA_PATH (/var/lib/gitea/data).
             - name: GITEA__server__SSH_SERVER_HOST_KEYS
               value: "ssh/ssh_host_ed25519_key,ssh/ssh_host_rsa_key"
+            # OpenBao SSH CA (ssh-ca.yaml): certificates log in as the user whose
+            # name is a principal of the cert. Each user registers that
+            # principal once (Settings > SSH / GPG Keys > Manage principals).
+            - name: GITEA__server__SSH_TRUSTED_USER_CA_KEYS
+              valueFrom:
+                secretKeyRef:
+                  name: gitea-ssh-ca
+                  key: trusted-user-ca-keys
+            - name: GITEA__server__SSH_AUTHORIZED_PRINCIPALS_ALLOW
+              value: username
             # Gitea Actions was decommissioned — keep it off.
             - name: GITEA__actions__ENABLED
               value: "false"

kubernetes/apps/wiki/deployment.yaml

@@ -53,7 +53,7 @@ spec:
           type: RuntimeDefault
       containers:
         - name: wiki
-          image: gitea.renner.uno/konairius/wiki:build.1793086240 # {"$imagepolicy": "flux-system:wiki"}
+          image: gitea.renner.uno/konairius/wiki:build.1793094262 # {"$imagepolicy": "flux-system:wiki"}
           securityContext:
             allowPrivilegeEscalation: false
             readOnlyRootFilesystem: true