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76ba88a51e0ae0690f4e8ae08e3ef2d16eeef539
home-network-k3s-impl/apps/wave-0/gitea.yaml
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jakman85andClaude Opus 4.8 87388712f0 feat(gitea): wire native Keycloak OIDC SSO (break-glass admin retained) 
Wires the bootstrapping-critical Gitea git host to the Keycloak `homelab` realm
as a native confidential OIDC client, moving it off the local-admin-only login
while keeping the local admin as the break-glass path (docs/15 availability
caveat; R-IDP-02/06).

Realm (source of truth): add the `gitea` confidential client to
platform/keycloak/keycloak-realm-import.yaml (modeled on grafana) + its
GITEA_CLIENT_SECRET placeholder sourced from the keycloak-realm-clients Secret.
NOTE: a KeycloakRealmImport no-ops on an already-existing realm, so the live
client was ALSO created via kcadm (id 70a6ca60-317a-42ce-8331-a60e380838ee);
the YAML keeps git authoritative for a rebuild.

Secrets (SOPS/age, never plaintext): add gitea-client-secret to
platform/keycloak/keycloak-realm-clients.sops.yaml (keycloak ns) and mirror the
same value as oidc-client-secret into apps/wave-0/gitea-bootstrap-secret.sops.yaml
(gitea ns) so the app can read it in-namespace. Both == the live client secret.

App config (catalog source + re-render): catalog/gitea.yaml gains the
GITEA_OIDC_CLIENT_SECRET env (from the mirrored Secret), [oauth2_client]
auto-registration/account-linking app.ini env, and an idempotent postStart step
that registers the "keycloak" OAuth2 login source (auto-discovery; groups claim;
platform-admins -> Gitea admin). apps/wave-0/gitea.yaml re-rendered via
`render.py --no-image-automation`.

Verified: realm import Done=True/HasErrors=False and platform-config
Ready=True/Healthy=True (unchanged); edited realm YAML passes server dry-run;
static gate (lint/l0/l1) green. Browser SSO login still needs a human check.

Co-Authored-By: Claude Opus 4.8 <[email protected]>
2026-08-27 17:01:46 -05:00

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---
# Namespace (trust zone; default-deny + policies apply)
apiVersion: v1
kind: Namespace
metadata:
name: gitea
labels:
homelab.keithjackson.dev/app-namespace: 'true'
gateway-access: shared
annotations:
homelab.keithjackson.dev/backup-policy: daily-offcluster
---
# Default-deny baseline (R-NET-01): deny all, allow only DNS
apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
name: default-deny
namespace: gitea
labels:
homelab.keithjackson.dev/baseline: default-deny
spec:
podSelector: {}
policyTypes:
- Ingress
- Egress
ingress: []
egress:
- to:
- namespaceSelector:
matchLabels:
kubernetes.io/metadata.name: kube-system
ports:
- protocol: UDP
port: 53
- protocol: TCP
port: 53
---
# PVC gitea-data (R-STATE)
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
name: gitea-data
namespace: gitea
labels:
app.kubernetes.io/name: gitea
spec:
accessModes:
- ReadWriteOnce
storageClassName: longhorn
resources:
requests:
storage: 10Gi
---
# Deployment (R-PLAT-02)
apiVersion: apps/v1
kind: Deployment
metadata:
name: gitea
namespace: gitea
labels:
app.kubernetes.io/name: gitea
spec:
replicas: 1
strategy:
type: Recreate
selector:
matchLabels:
app.kubernetes.io/name: gitea
template:
metadata:
labels:
app.kubernetes.io/name: gitea
homelab.keithjackson.dev/egress-class: internet
homelab.keithjackson.dev/auth-mode: oidc
annotations:
homelab.keithjackson.dev/auth-mode: oidc
homelab.keithjackson.dev/auth-groups: platform-admins
spec:
containers:
- name: gitea
image: gitea/gitea:1.24.3
ports:
- containerPort: 3000
env:
- name: GITEA__security__INSTALL_LOCK
value: 'true'
- name: GITEA__security__SECRET_KEY
valueFrom:
secretKeyRef:
name: gitea-bootstrap
key: secret-key
- name: GITEA__server__DOMAIN
value: gitea.home.keithjackson.dev
- name: GITEA__server__ROOT_URL
value: https://gitea.home.keithjackson.dev/
- name: GITEA__actions__ENABLED
value: 'true'
- name: GITEA__actions__DEFAULT_ACTIONS_URL
value: github
- name: GITEA_ADMIN_USERNAME
valueFrom:
secretKeyRef:
name: gitea-bootstrap
key: admin-username
- name: GITEA_ADMIN_PASSWORD
valueFrom:
secretKeyRef:
name: gitea-bootstrap
key: admin-password
- name: GITEA_OIDC_CLIENT_SECRET
valueFrom:
secretKeyRef:
name: gitea-bootstrap
key: oidc-client-secret
- name: GITEA__oauth2_client__ENABLE_AUTO_REGISTRATION
value: 'true'
- name: GITEA__oauth2_client__ACCOUNT_LINKING
value: auto
- name: GITEA__oauth2_client__USERNAME
value: preferred_username
volumeMounts:
- name: data
mountPath: /data
lifecycle:
postStart:
exec:
command:
- /bin/sh
- -c
- "# Idempotent break-glass admin bootstrap. Runs alongside the gitea entrypoint\n# (which, with INSTALL_LOCK=true, headless-installs + migrates the DB on first\n# boot). Waits for the DB, then creates the admin only if it does not exist.\nset -u\nexport HOME=/data/git\ni=0\nuntil su-exec git gitea admin user list >/dev/null 2>&1; do\n i=$((i + 1))\n [ \"$i\" -ge 150 ] && { echo \"[gitea-bootstrap] DB not ready after wait; skipping\" >&2; exit 0; }\n sleep 2\ndone\nif su-exec git gitea admin user list --admin 2>/dev/null | awk 'NR>1{print $2}' | grep -qx \"$GITEA_ADMIN_USERNAME\"; then\n echo \"[gitea-bootstrap] admin '$GITEA_ADMIN_USERNAME' already present\"\nelse\n n=0\n until su-exec git gitea admin user create \\\n --username \"$GITEA_ADMIN_USERNAME\" \\\n --password \"$GITEA_ADMIN_PASSWORD\" \\\n --email \"[email protected]\" \\\n --admin --must-change-password=false; do\n n=$((n + 1))\n [ \"$n\" -ge 10 ] && { echo \"[gitea-bootstrap] admin create failed after retries\" >&2; break; }\n sleep 3\n done\n echo \"[gitea-bootstrap] created break-glass admin '$GITEA_ADMIN_USERNAME'\"\nfi\n# --- Keycloak OIDC login source (idempotent add-or-update; R-IDP-02/06) ---\n# Registers the confidential `gitea` client as the OAuth2 login source \"keycloak\" against the\n# homelab realm's discovery doc. The `groups` claim maps the platform-admins group to Gitea\n# admin (--admin-group). Auto-discovery pulls auth/token/userinfo/jwks endpoints. Runs on every\n# start: updates the existing source if present, else creates it. Missing secret => skip (the\n# local break-glass admin above still works), so an unfilled secret never crashes the pod.\nif [ -n \"${GITEA_OIDC_CLIENT_SECRET:-}\" ]; then\n oidc_id=$(su-exec git gitea admin auth list 2>/dev/null | awk '$2==\"keycloak\"{print $1; exit}')\n if [ -n \"$oidc_id\" ]; then\n su-exec git gitea admin auth update-oauth --id \"$oidc_id\" \\\n --name keycloak --provider openidConnect --key gitea \\\n --secret \"$GITEA_OIDC_CLIENT_SECRET\" \\\n --auto-discover-url https://keycloak.home.keithjackson.dev/realms/homelab/.well-known/openid-configuration \\\n --scopes \"openid email profile\" --group-claim-name groups --admin-group platform-admins \\\n && echo \"[gitea-oidc] updated login source 'keycloak' (id $oidc_id)\" \\\n || echo \"[gitea-oidc] update-oauth failed\" >&2\n else\n su-exec git gitea admin auth add-oauth \\\n --name keycloak --provider openidConnect --key gitea \\\n --secret \"$GITEA_OIDC_CLIENT_SECRET\" \\\n --auto-discover-url https://keycloak.home.keithjackson.dev/realms/homelab/.well-known/openid-configuration \\\n --scopes \"openid email profile\" --group-claim-name groups --admin-group platform-admins \\\n && echo \"[gitea-oidc] added login source 'keycloak'\" \\\n || echo \"[gitea-oidc] add-oauth failed\" >&2\n fi\nelse\n echo \"[gitea-oidc] GITEA_OIDC_CLIENT_SECRET unset; skipping OIDC source (break-glass admin only)\"\nfi\n"
volumes:
- name: data
persistentVolumeClaim:
claimName: gitea-data
---
# Service
apiVersion: v1
kind: Service
metadata:
name: gitea
namespace: gitea
labels:
app.kubernetes.io/name: gitea
spec:
selector:
app.kubernetes.io/name: gitea
ports:
- name: port-3000
port: 3000
targetPort: 3000
---
# CiliumNetworkPolicy gateway-ingress allow (R-NET-01/02): gitea-allow-gateway-ingress
apiVersion: cilium.io/v2
kind: CiliumNetworkPolicy
metadata:
name: gitea-allow-gateway-ingress
namespace: gitea
labels:
app.kubernetes.io/name: gitea
spec:
endpointSelector:
matchLabels:
app.kubernetes.io/name: gitea
ingress:
- fromEntities:
- ingress
toPorts:
- ports:
- port: '3000'
protocol: TCP
---
# CiliumNetworkPolicy world egress allow (egress class governs the path; R-NET-05): gitea-allow-internet-egress
apiVersion: cilium.io/v2
kind: CiliumNetworkPolicy
metadata:
name: gitea-allow-internet-egress
namespace: gitea
labels:
app.kubernetes.io/name: gitea
spec:
endpointSelector:
matchLabels:
app.kubernetes.io/name: gitea
egress:
- toEntities:
- world
---
# HTTPRoute gitea-3000 (R-TLS/R-DNS)
apiVersion: gateway.networking.k8s.io/v1
kind: HTTPRoute
metadata:
name: gitea-3000
namespace: gitea
labels:
app.kubernetes.io/name: gitea
annotations:
homelab.keithjackson.dev/auth-mode: oidc
homelab.keithjackson.dev/auth-groups: platform-admins
spec:
parentRefs:
- name: shared
namespace: gateway
sectionName: https
hostnames:
- gitea.home.keithjackson.dev
rules:
- matches:
- path:
type: PathPrefix
value: /
backendRefs:
- name: gitea
port: 3000
---
# ServiceMonitor (R-OBS-01)
apiVersion: monitoring.coreos.com/v1
kind: ServiceMonitor
metadata:
name: gitea
namespace: gitea
labels:
release: kube-prometheus-stack
app.kubernetes.io/name: gitea
spec:
selector:
matchLabels:
app.kubernetes.io/name: gitea
namespaceSelector:
matchNames:
- gitea
endpoints:
- port: metrics
interval: 30s
---
# PrometheusRule SLI alerts (R-OBS-01)
apiVersion: monitoring.coreos.com/v1
kind: PrometheusRule
metadata:
name: gitea-slis
namespace: gitea
labels:
release: kube-prometheus-stack
app.kubernetes.io/name: gitea
spec:
groups:
- name: gitea.slis
rules:
- alert: gitea-down
expr: up{job="gitea"} == 0
for: 5m
labels:
severity: critical
service: gitea
annotations:
summary: gitea is down
description: 'gitea has been unreachable for 5m (SLI: up).'
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