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]>

apps/wave-0/gitea-bootstrap-secret.sops.yaml

@@ -14,6 +14,7 @@ stringData:
     secret-key: ENC[AES256_GCM,data:N4wgSipwTYNgkwujPzGs8Bo63IzUip1TwfVq9fG+Z2nECrgIV9PYkEyL4ic3Ej9f5udOE4fHwsbgcyuiJw==,iv:p33bef3z2fDbaAi6beGF+CWmeTeS7Vn46ce1/2zQH4g=,tag:CLJ+kZbmz0tiPtOsI3+dIg==,type:str]
     admin-username: ENC[AES256_GCM,data:hyWYQ3UC8c9H2Os=,iv:bgn72bsILLxChY9QAsAD3tYWvsWS2CBe0FlneCCSr+E=,tag:7qP/P8TjDmRFsuXjJF8A2g==,type:str]
     admin-password: ENC[AES256_GCM,data:GPz1vracB1U6YurrV1AEhX9VEGx3lwCOXqOmKAg6+/6NjGPmTv+r2uosawVYtwie,iv:L/QKFqo7RpSg4eQGie/+R5BDBgTiTzwDdWuofJeebFE=,tag:cD6AU9tahLskTaaU/A7BOA==,type:str]
+    oidc-client-secret: ENC[AES256_GCM,data:T0CoSmS2yn0LBWdZ/AgkoMfNNoSTX+2EWzBMB3AV1ARxOP4mxP0IqElWvIH2xmseDJo7/o1fD0FU/E9BpgkSuw==,iv:xJoBSuBA6ATFd1XNVlI+tqj+hks1HvtAet3TGHtkxU8=,tag:h1P9pqubdvLk5znFLo/Slw==,type:str]
 sops:
     kms: []
     gcp_kms: []
@@ -29,8 +30,8 @@ sops:
             Nys4V2NBZWF6U2lER05HV3FNZ1pOQ1kKEVHBTPTAJfiQBzkP/QezTzOfS96nYzxg
             Ad1m50j67vyFaBCVAb0/0toEUAm+qEV4wzOglaNmZuScavY4ntwCIw==
             -----END AGE ENCRYPTED FILE-----
-    lastmodified: "2026-08-25T23:06:33Z"
+    lastmodified: "2026-08-27T21:58:13Z"
-    mac: ENC[AES256_GCM,data:ik735BfSMdlB4IUceScEfY4aNNNo61po7W7x/6iod1VvsiMo0+7nUrVqD2uiL8p066k6g/hV+BNg5BwnYRVjvkVm8tU60ctcjEDfinxtgnqRNBVK81RROn5GtsRCzuBxiJ5J8ulgb45+jG9ND6Xuo9XuTZ35PWs/4/Ebdl/jpPM=,iv:Nt3QtDz3S37AnrtG2nd1TIHgFFemgxXrKrHfXTVo6S4=,tag:ScMtwQAF8a4heyhN+iXt/A==,type:str]
+    mac: ENC[AES256_GCM,data:/4DR4Ot6ZBeCoe9zJQoAV/WqmAx1TvsNbYbwpDhqDETGJkatIkbo5VivwljeocZsuWVKklefNZE95ycFzN+fAVsZoY03n4B7fdp4KpjoSFRs9IhhJYM57vamWDP0ppjhGzOV5RoT8kynZiIvBCXJjhs072ilwpQ8qLdTCmMMgbU=,iv:m9M2vJIqlTS4vWBEzLwtr7G8IrTFSHQuh5eAjdyUx8s=,tag:VF9jnwHWemowIC2pWS2AwQ==,type:str]
     pgp: []
     encrypted_regex: ^(data|stringData)$
     version: 3.9.4

apps/wave-0/gitea.yaml

@@ -107,6 +107,17 @@ spec:
             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
@@ -116,7 +127,7 @@ spec:
               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 '$GITEA_ADMIN_USERNAME' already present\"\n  exit 0\nfi\nn=0\nuntil su-exec git gitea admin user create \\\n  --username \"$GITEA_ADMIN_USERNAME\" \\\n  --password \"$GITEA_ADMIN_PASSWORD\" \\\n  --email \"[email protected]\" \\\n  --admin --must-change-password=false; do\n  n=$((n + 1))\n  [ \"$n\" -ge 10 ] && { echo \"[gitea-bootstrap] admin create failed after retries\" >&2; exit 0; }\n  sleep 3\ndone\necho \"[gitea-bootstrap] created break-glass admin '$GITEA_ADMIN_USERNAME'\"\n"
+              - "# 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:

catalog/gitea.yaml

@@ -41,6 +41,23 @@ env:
       secretKeyRef:
         name: gitea-bootstrap
         key: admin-password
+  # --- Keycloak native OIDC SSO (auth.mode oidc; docs/15 "Native OIDC"; R-IDP-02/06). The confidential
+  #     `gitea` realm client's secret is mirrored into this namespace's gitea-bootstrap Secret (the same
+  #     value SOPS-held in keycloak-realm-clients); the postStart hook registers it as the "keycloak"
+  #     OAuth2 login source. The LOCAL admin above stays as the break-glass path (docs/15). ---
+  - name: GITEA_OIDC_CLIENT_SECRET
+    valueFrom:
+      secretKeyRef:
+        name: gitea-bootstrap
+        key: oidc-client-secret
+  # app.ini [oauth2_client]: auto-provision a Gitea account on first Keycloak login and link it to an
+  # existing local account by verified email, so SSO users don't need a pre-created local user.
+  - 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
 lifecycle:
   postStart:
     exec:
@@ -61,19 +78,47 @@ lifecycle:
           done
           if su-exec git gitea admin user list --admin 2>/dev/null | awk 'NR>1{print $2}' | grep -qx "$GITEA_ADMIN_USERNAME"; then
             echo "[gitea-bootstrap] admin '$GITEA_ADMIN_USERNAME' already present"
-            exit 0
+          else
+            n=0
+            until su-exec git gitea admin user create \
+              --username "$GITEA_ADMIN_USERNAME" \
+              --password "$GITEA_ADMIN_PASSWORD" \
+              --email "[email protected]" \
+              --admin --must-change-password=false; do
+              n=$((n + 1))
+              [ "$n" -ge 10 ] && { echo "[gitea-bootstrap] admin create failed after retries" >&2; break; }
+              sleep 3
+            done
+            echo "[gitea-bootstrap] created break-glass admin '$GITEA_ADMIN_USERNAME'"
+          fi
+          # --- Keycloak OIDC login source (idempotent add-or-update; R-IDP-02/06) ---
+          # Registers the confidential `gitea` client as the OAuth2 login source "keycloak" against the
+          # homelab realm's discovery doc. The `groups` claim maps the platform-admins group to Gitea
+          # admin (--admin-group). Auto-discovery pulls auth/token/userinfo/jwks endpoints. Runs on every
+          # start: updates the existing source if present, else creates it. Missing secret => skip (the
+          # local break-glass admin above still works), so an unfilled secret never crashes the pod.
+          if [ -n "${GITEA_OIDC_CLIENT_SECRET:-}" ]; then
+            oidc_id=$(su-exec git gitea admin auth list 2>/dev/null | awk '$2=="keycloak"{print $1; exit}')
+            if [ -n "$oidc_id" ]; then
+              su-exec git gitea admin auth update-oauth --id "$oidc_id" \
+                --name keycloak --provider openidConnect --key gitea \
+                --secret "$GITEA_OIDC_CLIENT_SECRET" \
+                --auto-discover-url https://keycloak.home.keithjackson.dev/realms/homelab/.well-known/openid-configuration \
+                --scopes "openid email profile" --group-claim-name groups --admin-group platform-admins \
+                && echo "[gitea-oidc] updated login source 'keycloak' (id $oidc_id)" \
+                || echo "[gitea-oidc] update-oauth failed" >&2
+            else
+              su-exec git gitea admin auth add-oauth \
+                --name keycloak --provider openidConnect --key gitea \
+                --secret "$GITEA_OIDC_CLIENT_SECRET" \
+                --auto-discover-url https://keycloak.home.keithjackson.dev/realms/homelab/.well-known/openid-configuration \
+                --scopes "openid email profile" --group-claim-name groups --admin-group platform-admins \
+                && echo "[gitea-oidc] added login source 'keycloak'" \
+                || echo "[gitea-oidc] add-oauth failed" >&2
+            fi
+          else
+            echo "[gitea-oidc] GITEA_OIDC_CLIENT_SECRET unset; skipping OIDC source (break-glass admin only)"
           fi
-          n=0
-          until su-exec git gitea admin user create \
-            --username "$GITEA_ADMIN_USERNAME" \
-            --password "$GITEA_ADMIN_PASSWORD" \
-            --email "[email protected]" \
-            --admin --must-change-password=false; do
-            n=$((n + 1))
-            [ "$n" -ge 10 ] && { echo "[gitea-bootstrap] admin create failed after retries" >&2; exit 0; }
-            sleep 3
-          done
-          echo "[gitea-bootstrap] created break-glass admin '$GITEA_ADMIN_USERNAME'"
 exposure: public                # edge-forwarded git host at gitea.home.keithjackson.dev (docs/09; R-DNS/R-NET)
 egress: internet                # normal WAN egress (docs/03; R-NET-05)
 storage:
@@ -90,10 +135,12 @@ auth:
   mode: oidc                    # native Keycloak OIDC client (docs/13 SSO row, docs/15 "Native OIDC" set; R-IDP-02)
   groups:
     - platform-admins           # access scoped to an authorized group (R-IDP-06)
-  # NOTE (OIDC follow-up + break-glass): Gitea keeps a LOCAL admin as the break-glass path so an IdP
+  # WIRED (native OIDC): the Keycloak `gitea` confidential client (platform/keycloak/keycloak-realm-
-  # outage never locks the operator out of recovery tools (docs/15 "Availability caveat"). At initial
+  # import.yaml + live kcadm) is registered as Gitea's "keycloak" OAuth2 login source by the postStart
-  # deploy Gitea comes up on that local admin; the Keycloak OIDC client (+ SOPS client secret) is wired
+  # hook, using the client secret mirrored into the gitea-bootstrap Secret (oidc-client-secret; same
-  # once Keycloak is live. This declaration records the target integration; it does not embed a secret.
+  # value SOPS-held in keycloak-realm-clients). platform-admins (groups claim) -> Gitea admin. Gitea
+  # KEEPS a LOCAL admin as the break-glass path so an IdP outage never locks the operator out of
+  # recovery tools (docs/15 "Availability caveat"). No secret is embedded here.
 update:
   channel: stable               # R-UPD-01
   range: ">=1.22.0 <2.0.0"      # stay on the 1.x stable line

platform/keycloak/keycloak-realm-clients.sops.yaml

@@ -7,6 +7,7 @@ type: Opaque
 stringData:
     grafana-client-secret: ENC[AES256_GCM,data:J6grYrkJVubGNS+z1WrcUuvjKu2Z/fETWNXsKkjQnk/RlitaMjDqkazglKgy8PkEymNLNuVao48gksnuNLQ6aA==,iv:9sw5IdW+7GuwsRjn4NSi2JVZh9mTE2hiWJQYQS7w2bA=,tag:2hOUFeFqcQJsPeC8e6U4RA==,type:str]
     oauth2-proxy-client-secret: ENC[AES256_GCM,data:hE9mN6A6uTL3GpqOCGb3T0qVR9bcY4wcqNlgcrs9+uezSeci/Vs9uiXeFzfD57klHe8nEqxF1bCftD0GVFadhQ==,iv:rP2CbbGG4LWmGyV0adrlsmn2GtQLH8hSlqbioOAD824=,tag:p28vfuSZxYMs7XnAjslBWg==,type:str]
+    gitea-client-secret: ENC[AES256_GCM,data:ObU5sWSq2xEZKgqwccFo/kzs/nfhOVJ0NceBlgxgy6a6iOWeUN079iQpJ0ADoJyjsoQk1IQediFD06rwVSvNIQ==,iv:Bc4L8MngA6YKNRQRwEQojnUo5ixdS2t1AocvGMwE0oQ=,tag:YsozaKtL6CR68sPmGiL5wA==,type:str]
 sops:
     kms: []
     gcp_kms: []
@@ -22,8 +23,8 @@ sops:
             YXJGUUJiTnFndFhDZDU1bmxXTENCbmsKuhb3RQ3LZmuTPAXEck8b6iuZ5vxLb9fV
             +fQELmU4kOTbZrPSxy+kpttLG5Cy5d6X2ieZXBf6opzpLTUhlBOkHA==
             -----END AGE ENCRYPTED FILE-----
-    lastmodified: "2026-08-25T03:06:30Z"
+    lastmodified: "2026-08-27T21:58:13Z"
-    mac: ENC[AES256_GCM,data:wJ6Mf7yFXnnnuo/IhfGdDYcgNUzzNv2bFGN6wPwmVRr1To4rt3DGb1JZO19OxvloWYrGAyJaeXzC5NCLGDZOzS99TBmMy1TIeEYUqd6zEmFofEla0mZyLFGLsU/JUIVL3d1l4ECPmcHpUnEjJf4o4kE8BxkWAyHSMWktB69a1cc=,iv:7E7T7cFpAcT42ryTfqbDUoWr0d23a9rCI3n//LgBFS8=,tag:zVXOh/hjQNousg85TZw/Zg==,type:str]
+    mac: ENC[AES256_GCM,data:+QNCSmJMoAAUibsQZ7by/Neno6VfxLoxCNUoRwHAW+T3SDrgQI7hkrVcWr39bpCne7AAGnlyVS7Zd4m3lk/ZGs90LbSx5xdFyGPQ7vpI774aaIMQJe+84pBPLGw1NH8bVmDOS99P0rlIG0lGBixl4UqrQ3BWhgnd63tAvnKnCBU=,iv:K4Wi+LvKhszj3bnRBuheHdbS2UwhlN6hBJP/H3nEo9M=,tag:P4+14EaB88QQNzDvCUlnJA==,type:str]
     pgp: []
     encrypted_regex: ^(data|stringData)$
     version: 3.9.4

platform/keycloak/keycloak-realm-import.yaml

@@ -23,6 +23,10 @@ spec:
       secret:
         name: keycloak-realm-clients
         key: oauth2-proxy-client-secret
+    GITEA_CLIENT_SECRET:
+      secret:
+        name: keycloak-realm-clients
+        key: gitea-client-secret
   realm:
     realm: homelab
     enabled: true
@@ -145,6 +149,39 @@ spec:
               "access.token.claim": "true"
               "userinfo.token.claim": "true"
               "claim.name": groups
+      # gitea — native OIDC SSO for the bootstrapping-critical git host (catalog/gitea.yaml auth.mode
+      # oidc; docs/13 SSO row, docs/15 "Native OIDC"; R-IDP-02). Confidential auth-code client modeled on
+      # grafana. Redirect URI is Gitea's OAuth2 callback for the auth source named `keycloak`
+      # (/user/oauth2/<source>/callback). The `groups` claim drives authorization: Gitea maps the
+      # platform-admins group -> Gitea admin (auth source --admin-group; R-IDP-06). The LOCAL Gitea admin
+      # remains the break-glass path (docs/15 availability caveat). Secret injected from the SOPS
+      # keycloak-realm-clients Secret via the GITEA_CLIENT_SECRET placeholder (R-IDP-04).
+      - clientId: gitea
+        name: Gitea
+        protocol: openid-connect
+        enabled: true
+        publicClient: false
+        standardFlowEnabled: true
+        directAccessGrantsEnabled: false
+        secret: "$(env:GITEA_CLIENT_SECRET)"
+        redirectUris:
+          - https://gitea.home.keithjackson.dev/user/oauth2/keycloak/callback
+        webOrigins:
+          - https://gitea.home.keithjackson.dev
+        defaultClientScopes:
+          - email
+          - profile
+          - roles
+        protocolMappers:
+          - name: groups
+            protocol: openid-connect
+            protocolMapper: oidc-group-membership-mapper
+            config:
+              "full.path": "false"
+              "id.token.claim": "true"
+              "access.token.claim": "true"
+              "userinfo.token.claim": "true"
+              "claim.name": groups
     # --- MFA for platform-admins (R-IDP-04): a browser flow whose OTP step is CONDITIONAL on the
     #     platform-admin role. Non-admins log in without OTP; platform-admins must enroll/present TOTP.
     #     Set as the realm browserFlow below. VERIFY at bring-up (see runbook): a malformed flow fails