From 9558eaa50895945c26cf110792e498a13093af6b Mon Sep 17 00:00:00 2001
From: mptyl <mp@tylconsulting.it>
Date: Mon, 17 Aug 2026 20:21:42 +0200
Subject: [PATCH] feat(auth): integrate authentication with installation
 lifecycle

---
 compose.yaml                                  |   5 +
 deploy/compose.local.yaml                     |   1 -
 deploy/compose.server.yaml                    |   7 +-
 deploy/compose.session-server.yaml.example    |   1 -
 deploy/env/local.env.example                  |   1 +
 deploy/env/server.env.example                 |   1 +
 deploy/psd/operator.env.example               |   2 +-
 deploy/psd/thothii-installation.yaml.example  |   2 +
 deploy/secrets/README.md                      |   6 +-
 deploy/secrets/thothii.secrets.example        |   4 +
 .../examples/thothii-installation.local.yaml  |   2 +
 .../examples/thothii-installation.server.yaml |   2 +
 scripts/task13-runtime-fixture-check.ts       |  20 +-
 scripts/test-canonical-install-compose.sh     |  23 ++-
 scripts/test-compose-secret-policy.sh         |  17 ++
 scripts/test-default-compose.sh               |  22 +-
 scripts/test-task13-runtime-fixtures.sh       |   7 +
 scripts/unified-deployment-smoke.sh           | 194 ++++++++++++------
 tools/tht/cmd/tht/main.go                     |  20 ++
 tools/tht/cmd/tht/main_test.go                |  18 +-
 tools/tht/internal/backup/create.go           |  88 +++++++-
 tools/tht/internal/backup/create_test.go      |  69 +++++++
 tools/tht/internal/backup/restore.go          | 131 +++++++++---
 tools/tht/internal/backup/restore_test.go     |  68 ++++++
 tools/tht/internal/doctor/report.go           |   4 +-
 tools/tht/internal/doctor/report_test.go      |  13 +-
 tools/tht/internal/setup/files_test.go        |   3 +
 tools/tht/internal/setup/request.go           |  10 +
 tools/tht/internal/setup/run.go               |  74 +++++++
 tools/tht/internal/setup/run_test.go          |  61 +++++-
 30 files changed, 756 insertions(+), 120 deletions(-)

diff --git a/compose.yaml b/compose.yaml
index 59e77fdb..f395f575 100644
--- a/compose.yaml
+++ b/compose.yaml
@@ -23,6 +23,8 @@ services:
       THT_WORKSPACE_SECRET_ROOTS: /run/secrets
       THT_SECRETS_FILE: /run/secrets/thothii.secrets
       THT_PI_AUTH_FILE: /home/thoth/.pi/agent/auth.json
+      THT_AUTH_CONFIG_FILE: /run/thothii-auth/auth.yaml
+      THT_AUTH_STATE_ROOT: /data/auth
       THT_DB_NAME: ${THT_DB_NAME:-}
       THT_DWH_REST_URL: ${THT_DWH_REST_URL:-}
       THT_LLM_URL: ${THT_LLM_URL:-}
@@ -40,6 +42,8 @@ services:
       - workspace-registry:/data/workspace-registry
       - workspace-secrets:/data/workspace-secrets
       - sessions:/data/sessions
+      - ${THT_AUTH_CONFIG_ROOT:?set THT_AUTH_CONFIG_ROOT}:/run/thothii-auth:ro
+      - auth-state:/data/auth
     secrets:
       - source: thothii_secrets
         target: thothii.secrets
@@ -204,6 +208,7 @@ volumes:
   sessions:
   qdrant-data:
   embedding-models:
+  auth-state:
 
 secrets:
   thothii_secrets:
diff --git a/deploy/compose.local.yaml b/deploy/compose.local.yaml
index 833d6bae..75d3ae6f 100644
--- a/deploy/compose.local.yaml
+++ b/deploy/compose.local.yaml
@@ -1,7 +1,6 @@
 services:
   core:
     environment:
-      AUTH_MODE: none
       NODE_ENV: development
       THT_WORKSPACE_INSTALLATION_ID: local
     ports:
diff --git a/deploy/compose.server.yaml b/deploy/compose.server.yaml
index 98c5365e..4bde7877 100644
--- a/deploy/compose.server.yaml
+++ b/deploy/compose.server.yaml
@@ -1,7 +1,6 @@
 services:
   core:
     environment:
-      AUTH_MODE: upstream
       THOTH_PUBLIC_EXPOSURE: "true"
       THT_DATA_ROOT: /data
       THT_WORKSPACE_INSTALLATION_ID: server
@@ -11,6 +10,10 @@ services:
       - type: bind
         source: ${THT_DATA_ROOT:?set THT_DATA_ROOT}
         target: /data
+      - type: bind
+        source: ${THT_AUTH_CONFIG_ROOT:?set THT_AUTH_CONFIG_ROOT}
+        target: /run/thothii-auth
+        read_only: true
       - type: bind
         source: ${THT_PI_STATE_ROOT:?set THT_PI_STATE_ROOT}
         target: /home/thoth/.pi
@@ -30,6 +33,8 @@ services:
         source: ${THT_WORKSPACE_REGISTRY_ROOT:?set THT_WORKSPACE_REGISTRY_ROOT}
         target: /data/workspace-registry
     restart: unless-stopped
+    # Deprecated migration adapter: only use this when no auth.yaml is mounted yet.
+    # AUTH_MODE: upstream
 
   frontend:
     ports:
diff --git a/deploy/compose.session-server.yaml.example b/deploy/compose.session-server.yaml.example
index 31643170..43821be6 100644
--- a/deploy/compose.session-server.yaml.example
+++ b/deploy/compose.session-server.yaml.example
@@ -3,7 +3,6 @@
 services:
   core:
     environment:
-      AUTH_MODE: upstream
       THOTH_PUBLIC_EXPOSURE: "true"
       THT_SESSION_STORAGE: postgres
       THT_CONFIG: /app/harness/workspaces/server-sessions.yaml
diff --git a/deploy/env/local.env.example b/deploy/env/local.env.example
index 483869ca..d7627d2a 100644
--- a/deploy/env/local.env.example
+++ b/deploy/env/local.env.example
@@ -6,6 +6,7 @@ THOTH_CORE_HTTP_PORT=8787
 MAX_PI_PROCESSES=4
 PI_AUTH_FILE=/absolute/path/to/pi-auth.json
 THT_SECRETS_FILE=/absolute/path/to/thothii.secrets
+THT_AUTH_CONFIG_ROOT=/absolute/path/to/thothii-auth
 
 THT_WORKSPACE_GIT_REMOTE=https://git.example.invalid/platform/thoth-workspaces.git
 THT_WORKSPACE_GIT_BRANCH=main
diff --git a/deploy/env/server.env.example b/deploy/env/server.env.example
index 22e6f40f..152c3c2e 100644
--- a/deploy/env/server.env.example
+++ b/deploy/env/server.env.example
@@ -5,6 +5,7 @@ THOTH_HTTP_PORT=8080
 MAX_PI_PROCESSES=4
 PI_AUTH_FILE=/absolute/path/to/pi-auth.json
 THT_SECRETS_FILE=/absolute/path/to/thothii.secrets
+THT_AUTH_CONFIG_ROOT=/absolute/path/to/thothii-auth
 
 THT_DATA_ROOT=/srv/thothii/data
 THT_PI_STATE_ROOT=/srv/thothii/pi-state
diff --git a/deploy/psd/operator.env.example b/deploy/psd/operator.env.example
index 612e2dca..ebdd2a64 100644
--- a/deploy/psd/operator.env.example
+++ b/deploy/psd/operator.env.example
@@ -9,6 +9,7 @@ THT_WORKSPACE_GIT_KNOWN_HOSTS_FILE=<abs>/deploy/psd/secrets/git-known-hosts
 # App
 THT_SECRETS_FILE=<abs>/deploy/psd/secrets/thothii.secrets
 PI_AUTH_FILE=<abs>/deploy/psd/secrets/pi-auth.json
+THT_AUTH_CONFIG_ROOT=<abs>/deploy/psd/auth
 # DWH and Evidence credentials are entered later in Workspace management and stored encrypted
 # by the backend. They do not depend on host filesystem paths.
 
@@ -19,7 +20,6 @@ PI_THINKING=medium
 
 # App defaults
 THT_DWH_PRECHECK=true
-AUTH_MODE=none
 THOTH_PUBLIC_EXPOSURE=false
 MAX_PI_PROCESSES=4
 THOTH_HTTP_PORT=8080
diff --git a/deploy/psd/thothii-installation.yaml.example b/deploy/psd/thothii-installation.yaml.example
index 2811a5aa..d4afc2c3 100644
--- a/deploy/psd/thothii-installation.yaml.example
+++ b/deploy/psd/thothii-installation.yaml.example
@@ -8,5 +8,7 @@ workspaceRepository:
   remote: git@github.com:mptyl/tht-workspace-psd.git
   branch: main
   access: ssh
+authentication:
+  configDirectory: "<abs>/projects/ThothII/deploy/psd/auth"
 overrides:
   - "<abs>/projects/ThothII/deploy/compose.git-ssh.yaml"
diff --git a/deploy/secrets/README.md b/deploy/secrets/README.md
index 2a352fe8..23252411 100644
--- a/deploy/secrets/README.md
+++ b/deploy/secrets/README.md
@@ -9,8 +9,10 @@ chmod 600 deploy/secrets/thothii.secrets
 ```
 
 The file uses strict `KEY=VALUE` lines (comments and blank lines are allowed). The supported
-keys are `THT_MODEL_API_KEY`, `THT_DWH_API_KEY`, `THT_CA`, and `THT_SSL_CA`. Values must be
-non-empty and contain no whitespace. Do not put secrets
+keys are `THT_MODEL_API_KEY`, `THT_DWH_API_KEY`, `THT_CA`, `THT_SSL_CA`,
+`THT_OIDC_CLIENT_SECRET`, and `THT_AUTHENTIK_API_TOKEN`. The two authentication keys are fixed
+empty entries for local authentication and must be populated only in a protected OIDC installation.
+Other configured values must be non-empty and contain no whitespace. Do not put secrets
 in the root `.env`, workspace YAML, URLs, logs, or rendered Compose output.
 
 Do not add vector or embedding endpoint credentials to the bundle. Active operator manuals use
diff --git a/deploy/secrets/thothii.secrets.example b/deploy/secrets/thothii.secrets.example
index f6013204..40c633db 100644
--- a/deploy/secrets/thothii.secrets.example
+++ b/deploy/secrets/thothii.secrets.example
@@ -10,3 +10,7 @@
 
 # Optional CA material/path understood by the configured adapter.
 # THT_CA=/run/secrets/ca-chain.pem
+
+# OIDC/Authentik references. Keep these fixed keys empty until OIDC is configured.
+THT_OIDC_CLIENT_SECRET=
+THT_AUTHENTIK_API_TOKEN=
diff --git a/docs/install/examples/thothii-installation.local.yaml b/docs/install/examples/thothii-installation.local.yaml
index ef4a9e5a..193746f7 100644
--- a/docs/install/examples/thothii-installation.local.yaml
+++ b/docs/install/examples/thothii-installation.local.yaml
@@ -7,5 +7,7 @@ workspaceRepository:
   remote: git@git.example.com:organization/workspaces.git
   branch: main
   access: ssh
+authentication:
+  configDirectory: "/absolute/path/to/thothii-auth"
 overrides:
   - "/absolute/path/to/ThothII/deploy/compose.git-ssh.yaml"
diff --git a/docs/install/examples/thothii-installation.server.yaml b/docs/install/examples/thothii-installation.server.yaml
index 5f6e1dff..ab3e2912 100644
--- a/docs/install/examples/thothii-installation.server.yaml
+++ b/docs/install/examples/thothii-installation.server.yaml
@@ -7,6 +7,8 @@ workspaceRepository:
   remote: git@git.example.com:organization/workspaces.git
   branch: main
   access: ssh
+authentication:
+  configDirectory: "/absolute/path/to/thothii-auth"
 overrides:
   - "/absolute/path/to/ThothII/deploy/compose.session-server.yaml.example"
   - "/absolute/path/to/ThothII/deploy/compose.git-ssh.yaml"
diff --git a/scripts/task13-runtime-fixture-check.ts b/scripts/task13-runtime-fixture-check.ts
index 5d2de1bc..83e1a461 100644
--- a/scripts/task13-runtime-fixture-check.ts
+++ b/scripts/task13-runtime-fixture-check.ts
@@ -1,4 +1,4 @@
-import { constants, accessSync, readFileSync, statSync } from "node:fs";
+import { constants, accessSync, readFileSync, realpathSync, statSync } from "node:fs";
 import { basename, dirname, join } from "node:path";
 import { createRequire } from "node:module";
 import { resolveRuntimeBindings } from "../backend/src/workspaces/bindings.js";
@@ -28,7 +28,12 @@ for (const [name, service, expectedExpose] of [
   ["qdrant", qdrant, "6333"],
   ["embedding", embedding, "11434"],
 ] as const) {
-  if ((service.ports || []).length !== 0) throw new Error(`${name} must not publish host ports`);
+  const localQdrantDashboard = name === "qdrant" && profile === "local"
+    && (service.ports || []).length === 1
+    && service.ports[0].host_ip === "127.0.0.1" && Number(service.ports[0].target) === 6333;
+  if ((service.ports || []).length !== 0 && !localQdrantDashboard) {
+    throw new Error(`${name} must not publish host ports outside the local Qdrant dashboard`);
+  }
   if ((service.expose || []).join(",") !== expectedExpose) {
     throw new Error(`${name} must expose only ${expectedExpose}`);
   }
@@ -139,8 +144,9 @@ for (const target of [
 }
 
 const resolverEnvironment = { ...core.environment };
-resolverEnvironment.THT_WS_TASK13_SMOKE_DWH_PASSWORD_FILE = runtimePasswordMounts[0].source;
-const bindings = resolveRuntimeBindings(workspace, resolverEnvironment, [dirname(runtimePasswordMounts[0].source)]);
+const runtimePasswordSource = realpathSync(runtimePasswordMounts[0].source);
+resolverEnvironment.THT_WS_TASK13_SMOKE_DWH_PASSWORD_FILE = runtimePasswordSource;
+const bindings = resolveRuntimeBindings(workspace, resolverEnvironment, [dirname(runtimePasswordSource)]);
 for (const [role, binding] of Object.entries(bindings)) {
   if ((binding as any).missing.length !== 0) {
     throw new Error(`workspace resolver reports missing ${role} bindings: ${(binding as any).missing.join(",")}`);
@@ -150,10 +156,14 @@ const runtime = parse(renderRuntimeConfig(workspace, bindings, {
   sessions: "/data/sessions",
   artifacts: "/data/artifacts",
   indexes: "/data/indexes",
+}, {
+  workspaceId: "task13-smoke",
+  workspaceRevision: "task13-fixture",
+  revisionContentRoot: join(dirname(workspacePath), "task13-fixture"),
 }));
 if (runtime.database.host !== expected.THT_WS_TASK13_SMOKE_DWH_HOST
   || runtime.database.user !== expected.THT_WS_TASK13_SMOKE_DWH_USER
-  || runtime.database.password_file !== runtimePasswordMounts[0].source) {
+  || runtime.database.password_file !== runtimePasswordSource) {
   throw new Error("workspace resolver produced the wrong DWH runtime");
 }
 if (runtime.resources?.vector?.base_url !== "http://qdrant:6333"
diff --git a/scripts/test-canonical-install-compose.sh b/scripts/test-canonical-install-compose.sh
index 462524e9..f9ccfa23 100755
--- a/scripts/test-canonical-install-compose.sh
+++ b/scripts/test-canonical-install-compose.sh
@@ -20,7 +20,8 @@ done
 printf '%s\n' '{}' >"$tmp/pi-auth.json"
 printf '%s\n' 'THT_MODEL_API_KEY=fixture-model-api-key' >"$tmp/thothii.secrets"
 chmod 0600 "$tmp/pi-auth.json" "$tmp/thothii.secrets"
-mkdir -p "$tmp/data" "$tmp/pi-state" "$tmp/workspace-registry"
+mkdir -p "$tmp/data" "$tmp/pi-state" "$tmp/workspace-registry" "$tmp/auth"
+chmod 0700 "$tmp/auth"
 "$root/scripts/prepare-server-pi-state.sh" "$tmp/pi-state" "$(id -u)" "$(id -g)" >/dev/null
 printf '%s\n' 'fixture-session-password' >"$tmp/session-runtime-password"
 printf '%s\n' 'fixture-session-migrator-password' >"$tmp/session-migrator-password"
@@ -34,7 +35,8 @@ for profile in local server; do
     printf '%s\n' \
       'THT_WORKSPACE_GIT_REMOTE=https://git.example.invalid/platform/thoth-workspaces.git' \
       "PI_AUTH_FILE=$tmp/pi-auth.json" \
-      "THT_SECRETS_FILE=$tmp/thothii.secrets"
+      "THT_SECRETS_FILE=$tmp/thothii.secrets" \
+      "THT_AUTH_CONFIG_ROOT=$tmp/auth"
     if [[ "$profile" == server ]]; then
       printf '%s\n' \
         "THT_DATA_ROOT=$tmp/data" \
@@ -73,6 +75,23 @@ if (!config.services.core.volumes?.some(
 )) {
   throw new Error(profile + ": install stack lacks the read-only Pi auth file");
 }
+const authConfig = config.services.core.volumes?.filter((mount) => mount.target === "/run/thothii-auth") || [];
+if (authConfig.length !== 1 || authConfig[0].type !== "bind" || !authConfig[0].read_only) {
+  throw new Error(profile + ": core must receive one read-only authentication config bind");
+}
+if (profile === "local") {
+  const authState = config.services.core.volumes?.filter((mount) => mount.target === "/data/auth") || [];
+  if (authState.length !== 1 || authState[0].type !== "volume" || authState[0].source !== "auth-state") {
+    throw new Error("local: core must receive the auth-state volume");
+  }
+} else if (!config.services.core.volumes?.some((mount) => mount.target === "/data" && mount.type === "bind")) {
+  throw new Error("server: core must preserve the whole /data bind that contains auth state");
+}
+if ((config.services["workspace-maintenance"]?.volumes || []).some(
+  (mount) => mount.target === "/run/thothii-auth" || mount.target === "/data/auth",
+)) {
+  throw new Error(profile + ": workspace-maintenance received authentication data");
+}
 if ((config.services.frontend.secrets || []).length !== 0) {
   throw new Error(profile + ": frontend received runtime secrets");
 }
diff --git a/scripts/test-compose-secret-policy.sh b/scripts/test-compose-secret-policy.sh
index d71ef146..044976da 100755
--- a/scripts/test-compose-secret-policy.sh
+++ b/scripts/test-compose-secret-policy.sh
@@ -56,6 +56,19 @@ if (core.environment?.THT_SECRETS_FILE !== "/run/secrets/thothii.secrets") {
 if (core.environment?.THT_PI_AUTH_FILE !== "/home/thoth/.pi/agent/auth.json") {
   throw new Error(`${name}: core does not declare the mounted Pi authentication source`);
 }
+if (core.environment?.THT_AUTH_CONFIG_FILE !== "/run/thothii-auth/auth.yaml"
+  || core.environment?.THT_AUTH_STATE_ROOT !== "/data/auth") {
+  throw new Error(`${name}: core authentication paths do not use the canonical locations`);
+}
+const authConfig = (core.volumes || []).filter((mount) => mount.target === "/run/thothii-auth");
+if (authConfig.length !== 1 || authConfig[0].type !== "bind" || !authConfig[0].read_only) {
+  throw new Error(`${name}: core must receive exactly one read-only authentication config bind`);
+}
+if ((config.services["workspace-maintenance"]?.volumes || []).some(
+  (mount) => mount.target === "/run/thothii-auth" || mount.target === "/data/auth",
+)) {
+  throw new Error(`${name}: workspace-maintenance received authentication data`);
+}
 if ((config.services.frontend?.secrets || []).length !== 0) {
   throw new Error(`${name}: frontend must not receive runtime secrets`);
 }
@@ -113,10 +126,13 @@ write_secret "$fixture_root/https-credentials" 'fixture-https-credentials'
 write_secret "$fixture_root/https-ca.pem" 'fixture-https-ca'
 write_secret "$fixture_root/dwh-password" 'fixture-dwh-password'
 write_secret "$fixture_root/vector-api-key" 'fixture-vector-api-key'
+mkdir -p "$fixture_root/auth"
+chmod 0700 "$fixture_root/auth"
 printf '%s\n' \
   'THT_WORKSPACE_GIT_REMOTE=https://git.example.invalid/platform/thoth-workspaces.git' \
   "PI_AUTH_FILE=$fixture_root/pi-auth.json" \
   "THT_SECRETS_FILE=$fixture_root/thothii.secrets" \
+  "THT_AUTH_CONFIG_ROOT=$fixture_root/auth" \
   "THT_WORKSPACE_BINDINGS_ENV_FILE=$fixture_root/workspace-bindings.env" \
   "THT_WORKSPACE_GIT_SSH_KEY_FILE=$fixture_root/ssh-private-key" \
   "THT_WORKSPACE_GIT_KNOWN_HOSTS_FILE=$fixture_root/ssh-known-hosts" \
@@ -188,6 +204,7 @@ printf '%s\n' \
   'THT_WORKSPACE_GIT_REMOTE=https://git.example.invalid/platform/thoth-workspaces.git' \
   "PI_AUTH_FILE=$fixture_root/pi-auth.json" \
   "THT_SECRETS_FILE=$fixture_root/thothii.secrets" \
+  "THT_AUTH_CONFIG_ROOT=$fixture_root/auth" \
   "THT_WS_NORTH_STAR_RESEARCH_DWH_PASSWORD_SOURCE=$fixture_root/dwh-password" \
   "THT_WS_NORTH_STAR_RESEARCH_VECTOR_API_KEY_SOURCE=$fixture_root/vector-api-key" \
   >"$fixture_root/operator-with-vector.env"
diff --git a/scripts/test-default-compose.sh b/scripts/test-default-compose.sh
index fbf15dbc..4b968dfd 100755
--- a/scripts/test-default-compose.sh
+++ b/scripts/test-default-compose.sh
@@ -24,7 +24,7 @@ if (services.join(",") !== "core,embedding,embedding-model-init,frontend,qdrant"
 if (/omics_portal|chirone|localllm_default|\/home\/chirone/i.test(JSON.stringify(config))) {
   throw new Error("default Compose contains application-specific coupling");
 }
-for (const volume of ["settings", "pi-state", "workspace-registry", "sessions", "qdrant-data", "embedding-models"]) {
+for (const volume of ["settings", "pi-state", "workspace-registry", "sessions", "auth-state", "qdrant-data", "embedding-models"]) {
   if (!config.volumes || !config.volumes[volume]) throw new Error(`missing required volume: ${volume}`);
 }
 const core = config.services.core;
@@ -35,9 +35,12 @@ const modelInit = config.services["embedding-model-init"];
 if (!frontend.ports?.some((port) => port.host_ip === "127.0.0.1")) {
   throw new Error("local frontend must publish a loopback port");
 }
-for (const service of [qdrant, embedding, modelInit]) {
+for (const service of [embedding, modelInit]) {
   if ((service.ports || []).length !== 0) throw new Error("private semantic services must not publish host ports");
 }
+if (!qdrant.ports?.some((port) => port.host_ip === "127.0.0.1" && Number(port.target) === 6333)) {
+  throw new Error("local Qdrant dashboard must publish only its loopback port");
+}
 if ((qdrant.expose || []).join(",") !== "6333") throw new Error("qdrant must expose only 6333");
 if ((embedding.expose || []).join(",") !== "11434") throw new Error("embedding must expose only 11434");
 if (!qdrant.healthcheck) throw new Error("qdrant must define a healthcheck");
@@ -53,8 +56,9 @@ if (modelInit.image !== "ollama/ollama:0.32.0@sha256:57f573b47f1f71ebb445789f279
 }
 const env = core.environment || {};
 for (const [key, value] of Object.entries({
-  AUTH_MODE: "none",
   THT_WORKSPACE_INSTALLATION_ID: "local",
+  THT_AUTH_CONFIG_FILE: "/run/thothii-auth/auth.yaml",
+  THT_AUTH_STATE_ROOT: "/data/auth",
   THT_INTERNAL_QDRANT_URL: "http://qdrant:6333",
   THT_INTERNAL_EMBEDDING_URL: "http://embedding:11434",
   THT_INTERNAL_EMBEDDING_MODEL: "qwen3-embedding:0.6b",
@@ -62,6 +66,18 @@ for (const [key, value] of Object.entries({
 })) {
   if (env[key] !== value) throw new Error(`unexpected core ${key}: ${env[key]}`);
 }
+const authConfigMounts = (core.volumes || []).filter((mount) => mount.target === "/run/thothii-auth");
+if (authConfigMounts.length !== 1 || authConfigMounts[0].type !== "bind" || !authConfigMounts[0].read_only) {
+  throw new Error("core must receive exactly one read-only authentication configuration bind");
+}
+const authStateMounts = (core.volumes || []).filter((mount) => mount.target === "/data/auth");
+if (authStateMounts.length !== 1 || authStateMounts[0].type !== "volume" || authStateMounts[0].source !== "auth-state") {
+  throw new Error("core must receive exactly one auth-state volume");
+}
+const maintenanceMounts = config.services["workspace-maintenance"]?.volumes || [];
+if (maintenanceMounts.some((mount) => mount.target === "/run/thothii-auth" || mount.target === "/data/auth")) {
+  throw new Error("workspace-maintenance must not receive authentication configuration or state");
+}
 for (const forbidden of ["THT_VEC_REST_URL", "THT_VEC_WRITE_REST_URL", "THT_OLLAMA_URL"]) {
   if (Object.hasOwn(env, forbidden) && env[forbidden] !== "") {
     throw new Error(`core must not require external semantic binding ${forbidden}`);
diff --git a/scripts/test-task13-runtime-fixtures.sh b/scripts/test-task13-runtime-fixtures.sh
index d87fff29..b8027e67 100755
--- a/scripts/test-task13-runtime-fixtures.sh
+++ b/scripts/test-task13-runtime-fixtures.sh
@@ -31,6 +31,13 @@ TASK13_LOG="$fixture/task13.log"
 TASK13_INSTALLATION="$fixture/thothii-installation.yaml"
 TASK13_PI_AUTH="$fixture/pi-auth.json"
 TASK13_SECRETS="$fixture/thothii.secrets"
+TASK13_AUTH_ROOT="$fixture/auth"
+TASK13_AUTH_PASSWORD_FILE="$fixture/local-auth-password"
+TASK13_AUTH_ADMIN=task13-admin
+TASK13_AUTH_PASSWORD="fixture-auth-password-$profile"
+TASK13_OIDC_CLIENT_SECRET="fixture-oidc-client-$profile"
+TASK13_AUTHENTIK_API_TOKEN="fixture-authentik-token-$profile"
+TASK13_FRONTEND_PORT=18080
 TASK13_SESSION_RUNTIME_PASSWORD="$fixture/runtime-password"
 TASK13_PI_MODELS="$fixture/models.json"
 TASK13_PI_SETTINGS="$fixture/settings.json"
diff --git a/scripts/unified-deployment-smoke.sh b/scripts/unified-deployment-smoke.sh
index 060ef5ac..a8a6d669 100755
--- a/scripts/unified-deployment-smoke.sh
+++ b/scripts/unified-deployment-smoke.sh
@@ -169,11 +169,12 @@ task13_compose_logged() {
 task13_write_environment() {
   local remote="$1"
   {
-    printf 'THOTH_HTTP_PORT=0\n'
+    printf 'THOTH_HTTP_PORT=%s\n' "$TASK13_FRONTEND_PORT"
     printf 'THOTH_CORE_HTTP_PORT=0\n'
     printf 'MAX_PI_PROCESSES=2\n'
     printf 'PI_AUTH_FILE=%s\n' "$TASK13_PI_AUTH"
     printf 'THT_SECRETS_FILE=%s\n' "$TASK13_SECRETS"
+    printf 'THT_AUTH_CONFIG_ROOT=%s\n' "$TASK13_AUTH_ROOT"
     printf 'THT_WORKSPACE_GIT_REMOTE=%s\n' "$remote"
     printf 'THT_WORKSPACE_GIT_BRANCH=%s\n' "$TASK13_BRANCH"
     printf 'THT_LLM_URL=http://%s:9000/v1\n' "$TASK13_LLM_CONTAINER"
@@ -185,8 +186,11 @@ task13_write_fixture_files() {
   printf '{}\n' >"$TASK13_PI_AUTH"
   printf 'THT_MODEL_API_KEY=%s\n' "$TASK13_SECRET_VALUE" >"$TASK13_SECRETS"
   printf '%s' "task13-runtime-password-$TASK13_RUN_ID" >"$TASK13_SESSION_RUNTIME_PASSWORD"
+  printf '%s' "$TASK13_AUTH_PASSWORD" >"$TASK13_AUTH_PASSWORD_FILE"
+  mkdir -p "$TASK13_AUTH_ROOT"
   chmod 0644 "$TASK13_PI_AUTH"
-  chmod 0600 "$TASK13_SECRETS" "$TASK13_SESSION_RUNTIME_PASSWORD"
+  chmod 0700 "$TASK13_AUTH_ROOT"
+  chmod 0600 "$TASK13_SECRETS" "$TASK13_SESSION_RUNTIME_PASSWORD" "$TASK13_AUTH_PASSWORD_FILE"
 
   cat >"$TASK13_PI_MODELS" <<EOF
 {
@@ -293,6 +297,8 @@ services:
       - $TASK13_PI_SETTINGS:/home/thoth/.pi/agent/settings.json:ro
       - workspace-registry:/data/workspace-registry
       - sessions:/data/sessions
+      - $TASK13_AUTH_ROOT:/run/thothii-auth:ro
+      - auth-state:/data/auth
       - $TASK13_SESSION_RUNTIME_PASSWORD:/run/secrets/task13-runtime-password:ro
       - $TASK13_REMOTE:/fixtures/remote.git:ro
   frontend:
@@ -303,6 +309,8 @@ services:
     labels:
       io.thothii.task13.run: "$TASK13_RUN_ID"
   qdrant:
+    # The normal local profile exposes a developer dashboard; the isolated smoke needs no host port.
+    ports: !reset []
     labels:
       io.thothii.task13.run: "$TASK13_RUN_ID"
   embedding:
@@ -328,6 +336,9 @@ volumes:
   sessions:
     labels:
       io.thothii.task13.run: "$TASK13_RUN_ID"
+  auth-state:
+    labels:
+      io.thothii.task13.run: "$TASK13_RUN_ID"
   qdrant-data:
     labels:
       io.thothii.task13.run: "$TASK13_RUN_ID"
@@ -341,6 +352,8 @@ EOF
 profile: local
 projectDirectory: "$TASK13_ROOT"
 envFile: "$TASK13_ENV_FILE"
+authentication:
+  configDirectory: "$TASK13_AUTH_ROOT"
 overrides:
   - "$TASK13_OVERRIDE"
 EOF
@@ -350,7 +363,8 @@ EOF
 task13_write_server_fixture_files() {
   local data_root pi_root registry_root remote_path workspace_path
   printf '{}\n' >"$TASK13_PI_AUTH"
-  printf 'THT_MODEL_API_KEY=%s\n' "$TASK13_SECRET_VALUE" >"$TASK13_SECRETS"
+  printf 'THT_MODEL_API_KEY=%s\nTHT_OIDC_CLIENT_SECRET=%s\nTHT_AUTHENTIK_API_TOKEN=%s\n' \
+    "$TASK13_SECRET_VALUE" "$TASK13_OIDC_CLIENT_SECRET" "$TASK13_AUTHENTIK_API_TOKEN" >"$TASK13_SECRETS"
   printf '%s' "$TASK13_SESSION_PASSWORD" >"$TASK13_SESSION_RUNTIME_PASSWORD"
   printf '%s' "$TASK13_SESSION_MIGRATOR_PASSWORD" >"$TASK13_SESSION_MIGRATOR_PASSWORD_FILE"
   cat >"$TASK13_SESSION_CA" <<'EOF'
@@ -383,10 +397,12 @@ EOF
   chmod 0600 "$TASK13_SERVER_WORKSPACE_CONFIG"
 
   mkdir -p "$TASK13_SERVER_DATA" "$TASK13_SERVER_PI_STATE" "$TASK13_SERVER_REGISTRY"
+  mkdir -p "$TASK13_AUTH_ROOT"
   "$TASK13_ROOT/scripts/prepare-server-pi-state.sh" \
     "$TASK13_SERVER_PI_STATE" "$(id -u)" "$(id -g)" >>"$TASK13_LOG"
   chmod 0777 "$TASK13_SERVER_DATA" "$TASK13_SERVER_PI_STATE" \
     "$TASK13_SERVER_PI_STATE/agent" "$TASK13_SERVER_REGISTRY"
+  chmod 0700 "$TASK13_AUTH_ROOT"
   data_root="$TASK13_SERVER_DATA"
   pi_root="$TASK13_SERVER_PI_STATE"
   registry_root="$TASK13_SERVER_REGISTRY"
@@ -449,6 +465,7 @@ EOF
     printf 'MAX_PI_PROCESSES=2\n'
     printf 'PI_AUTH_FILE=%s\n' "$TASK13_PI_AUTH"
     printf 'THT_SECRETS_FILE=%s\n' "$TASK13_SECRETS"
+    printf 'THT_AUTH_CONFIG_ROOT=%s\n' "$TASK13_AUTH_ROOT"
     printf 'THT_WORKSPACE_GIT_REMOTE=/fixtures/remote.git\n'
     printf 'THT_WORKSPACE_GIT_BRANCH=%s\n' "$TASK13_BRANCH"
     printf 'THT_DATA_ROOT=%s\n' "$data_root"
@@ -467,6 +484,18 @@ EOF
     printf 'THT_LLM_URL=https://llm.task13.invalid/v1\n'
   } >"$TASK13_ENV_FILE"
   chmod 0600 "$TASK13_ENV_FILE"
+
+  cat >"$TASK13_INSTALLATION" <<EOF
+profile: server
+projectDirectory: "$TASK13_ROOT"
+envFile: "$TASK13_ENV_FILE"
+authentication:
+  configDirectory: "$TASK13_AUTH_ROOT"
+overrides:
+  - "$TASK13_ROOT/deploy/compose.session-server.yaml.example"
+  - "$TASK13_OVERRIDE"
+EOF
+  chmod 0600 "$TASK13_INSTALLATION"
 }
 
 task13_workspace_metadata() {
@@ -596,6 +625,22 @@ task13_assert_rendered_contract() {
   if grep -Eq 'THT_VEC_REST_URL|THT_VEC_WRITE_REST_URL|THT_OLLAMA_URL' "$rendered"; then
     task13_fail "rendered Compose still exposes retired external semantic bindings"
   fi
+  grep -Fq '/run/thothii-auth' "$rendered" || task13_fail "rendered Compose lacks the read-only auth configuration mount"
+  grep -Fq '/data/auth' "$rendered" || task13_fail "rendered Compose lacks authentication state storage"
+}
+
+task13_configure_local_authentication() {
+  task13_run_logged "configure local authentication" "$TASK13_THT" --installation "$TASK13_INSTALLATION" auth configure \
+    --mode local --public-url "http://127.0.0.1:$TASK13_FRONTEND_PORT" \
+    --admin-user "$TASK13_AUTH_ADMIN" --admin-display-name "Task 13 Administrator" \
+    --password-file "$TASK13_AUTH_PASSWORD_FILE"
+}
+
+task13_configure_server_oidc_authentication() {
+  task13_run_logged "configure fake server OIDC authentication" "$TASK13_THT" --installation "$TASK13_INSTALLATION" auth configure \
+    --mode oidc --public-url "https://task13.example.invalid" \
+    --issuer "https://task13-fake-oidc.invalid/application/o/task13/" --client-id task13-smoke-client \
+    --authentik-base-url "https://task13-fake-authentik.invalid" --user-group task13-users --admin-group task13-admins
 }
 
 task13_start_stack() {
@@ -641,6 +686,49 @@ task13_core_id() {
   task13_compose ps -q core
 }
 
+task13_assert_maintenance_auth_isolation() {
+  task13_compose_logged "workspace maintenance auth isolation" \
+    --profile workspace-maintenance run --rm --no-deps --entrypoint sh workspace-maintenance -ceu \
+    'test ! -e /run/thothii-auth && test ! -e /data/auth'
+}
+
+task13_assert_local_auth_lifecycle() {
+  local frontend cookie_jar login_body me csrf unauthenticated
+  frontend="$(task13_frontend_address)"
+  cookie_jar="$TASK13_TMP/local-auth.cookies"
+  login_body="$TASK13_TMP/local-auth-login.json"
+  printf '{"username":"%s","password":"%s","remember":true}' \
+    "$TASK13_AUTH_ADMIN" "$TASK13_AUTH_PASSWORD" >"$login_body"
+  chmod 0600 "$cookie_jar" "$login_body" 2>/dev/null || chmod 0600 "$login_body"
+
+  task13_run_logged "local auth configuration" curl --connect-timeout "$TASK13_CURL_CONNECT_TIMEOUT" \
+    --max-time "$TASK13_CURL_MAX_TIME" --fail --silent --show-error "http://$frontend/api/auth/config"
+  task13_run_logged "local auth login" curl --connect-timeout "$TASK13_CURL_CONNECT_TIMEOUT" \
+    --max-time "$TASK13_CURL_MAX_TIME" --fail --silent --show-error --cookie-jar "$cookie_jar" \
+    -H "Origin: http://$frontend" -H 'content-type: application/json' --data-binary "@$login_body" \
+    "http://$frontend/api/auth/local/login"
+  me="$(curl --connect-timeout "$TASK13_CURL_CONNECT_TIMEOUT" --max-time "$TASK13_CURL_MAX_TIME" \
+    --fail --silent --show-error --cookie "$cookie_jar" "http://$frontend/api/me")"
+  node -e 'const value=JSON.parse(process.argv[1]); if(value.issuer!=="local"||value.session?.remembered!==true||typeof value.csrfToken!=="string") process.exit(1)' "$me" \
+    || task13_fail "local login did not create a remembered authenticated session"
+  csrf="$(node -e 'process.stdout.write(JSON.parse(process.argv[1]).csrfToken)' "$me")"
+  task13_compose_logged "remembered local auth core restart" up --detach --force-recreate --wait --wait-timeout 120 core
+  me="$(curl --connect-timeout "$TASK13_CURL_CONNECT_TIMEOUT" --max-time "$TASK13_CURL_MAX_TIME" \
+    --fail --silent --show-error --cookie "$cookie_jar" "http://$frontend/api/me")"
+  node -e 'const value=JSON.parse(process.argv[1]); if(value.session?.remembered!==true) process.exit(1)' "$me" \
+    || task13_fail "remembered local session did not survive a core restart"
+  csrf="$(node -e 'process.stdout.write(JSON.parse(process.argv[1]).csrfToken)' "$me")"
+  task13_run_logged "local auth Pi management" curl --connect-timeout "$TASK13_CURL_CONNECT_TIMEOUT" \
+    --max-time 45 --fail --silent --show-error --cookie "$cookie_jar" \
+    -H "Origin: http://$frontend" -H "x-thothii-csrf: $csrf" -X POST "http://$frontend/api/pi-management/test"
+  task13_run_logged "local auth logout" curl --connect-timeout "$TASK13_CURL_CONNECT_TIMEOUT" \
+    --max-time "$TASK13_CURL_MAX_TIME" --fail --silent --show-error --cookie "$cookie_jar" \
+    -H "Origin: http://$frontend" -H "x-thothii-csrf: $csrf" -X POST "http://$frontend/api/auth/logout"
+  unauthenticated="$(curl --connect-timeout "$TASK13_CURL_CONNECT_TIMEOUT" --max-time "$TASK13_CURL_MAX_TIME" \
+    --silent --output /dev/null --write-out '%{http_code}' --cookie "$cookie_jar" "http://$frontend/api/me")"
+  [[ "$unauthenticated" == 401 ]] || task13_fail "local logout did not revoke the remembered session"
+}
+
 task13_assert_runtime() {
   local frontend expected_pi actual_pi core_id
   frontend="$(task13_frontend_address)"
@@ -668,25 +756,11 @@ task13_assert_runtime() {
   core_id="$(task13_core_id)"
   [[ "$(docker inspect --format '{{ index .Config.Labels "io.thothii.task13.run" }}' "$core_id")" == "$TASK13_RUN_ID" ]] \
     || task13_fail "core lacks the explicit Task 13 resource label"
-  task13_compose_logged "internal Pi provider smoke" exec -T core \
-    curl --connect-timeout 3 --max-time 45 -fsS -X POST \
-    -H 'x-thoth-principal-issuer: tht' \
-    -H 'x-thoth-principal-subject: tht-maintenance' \
-    -H 'x-thoth-principal-display-name: Tht maintenance' \
-    -H 'x-thoth-is-admin: 1' \
-    http://127.0.0.1:8787/pi-management/test
+  task13_assert_maintenance_auth_isolation
+  task13_assert_local_auth_lifecycle
   task13_run_logged "tht Pi doctor" "$TASK13_THT" --installation "$TASK13_INSTALLATION" pi doctor
 }
 
-task13_server_auth_headers() {
-  TASK13_SERVER_AUTH_HEADERS=(
-    -H 'x-thoth-trusted-principal-issuer: task13-proxy'
-    -H 'x-thoth-trusted-principal-subject: task13-user'
-    -H 'x-thoth-trusted-principal-display-name: Task 13 User'
-    -H 'x-thoth-trusted-is-admin: 0'
-  )
-}
-
 task13_report_server_workspace_failure() {
   local status="$1" response="$2"
   printf 'authenticated server /api/workspaces returned HTTP %s\n' "$status" >&2
@@ -725,7 +799,7 @@ task13_report_server_workspace_failure() {
 }
 
 task13_assert_server_runtime() {
-  local frontend unauthenticated authenticated authenticated_status session_status core_id frontend_id
+  local frontend unauthenticated trusted_header_status session_status diagnostics diagnostic_status core_id frontend_id
   local expected_core_image expected_frontend_image
   frontend="$(task13_frontend_address)"
   task13_run_logged "server frontend health" curl \
@@ -744,7 +818,9 @@ task13_assert_server_runtime() {
   [[ "$(docker inspect --format '{{.Image}}' "$frontend_id")" == "$expected_frontend_image" ]] \
     || task13_fail "server frontend did not use the smoke-built frontend image"
   task13_compose exec -T core sh -ceu '
-    test "$AUTH_MODE" = upstream
+    test -r /run/thothii-auth/auth.yaml
+    test -d /data/auth
+    test -z "${AUTH_MODE+x}"
     test "$THT_SESSION_STORAGE" = postgres
     test -r /run/secrets/thothii.secrets
     test -r /run/secrets/session_runtime_password
@@ -757,37 +833,41 @@ task13_assert_server_runtime() {
     || task13_fail "server profile did not bind the disposable Pi state root"
   task13_mount_fingerprint | grep -Fq '/data/workspace-registry = bind :' \
     || task13_fail "server profile did not bind the disposable registry root"
+  task13_assert_maintenance_auth_isolation
 
   unauthenticated="$(curl --connect-timeout "$TASK13_CURL_CONNECT_TIMEOUT" \
     --max-time "$TASK13_CURL_MAX_TIME" --silent --output /dev/null --write-out '%{http_code}' \
     "http://$frontend/api/workspaces")"
-  [[ "$unauthenticated" == 401 ]] || task13_fail "server profile did not enforce upstream auth"
-  authenticated="$TASK13_TMP/server-workspaces.out"
-  task13_server_auth_headers
-  if ! authenticated_status="$(curl --connect-timeout "$TASK13_CURL_CONNECT_TIMEOUT" \
-    --max-time "$TASK13_CURL_MAX_TIME" --silent --show-error --output "$authenticated" \
-    --write-out '%{http_code}' "${TASK13_SERVER_AUTH_HEADERS[@]}" \
-    "http://$frontend/api/workspaces")"; then
-    task13_report_server_workspace_failure "${authenticated_status:-transport-error}" "$authenticated"
-    task13_fail "authenticated server workspace request failed"
-  fi
-  if [[ "$authenticated_status" != 200 ]]; then
-    task13_report_server_workspace_failure "$authenticated_status" "$authenticated"
-    task13_fail "authenticated server workspace route returned an unexpected status"
-  fi
-  grep -Fq 'Task 13 Smoke' "$authenticated" \
-    || task13_fail "authenticated server route did not expose the disposable registry"
+  [[ "$unauthenticated" == 401 ]] || task13_fail "server profile did not enforce OIDC authentication"
+  trusted_header_status="$(curl --connect-timeout "$TASK13_CURL_CONNECT_TIMEOUT" \
+    --max-time "$TASK13_CURL_MAX_TIME" --silent --output /dev/null --write-out '%{http_code}' \
+    -H 'x-thoth-trusted-principal-issuer: task13-proxy' \
+    -H 'x-thoth-trusted-principal-subject: task13-user' \
+    -H 'x-thoth-trusted-principal-display-name: Task 13 User' \
+    -H 'x-thoth-trusted-is-admin: 0' \
+    "http://$frontend/api/workspaces")"
+  [[ "$trusted_header_status" == 401 ]] || task13_fail "server accepted retired trusted identity headers"
 
   session_status="$(curl --connect-timeout "$TASK13_CURL_CONNECT_TIMEOUT" \
     --max-time "$TASK13_CURL_MAX_TIME" --silent --output "$TASK13_TMP/server-sessions.out" \
     --write-out '%{http_code}' \
-    "${TASK13_SERVER_AUTH_HEADERS[@]}" \
     "http://$frontend/api/sessions")"
-  [[ "$session_status" == 503 ]] \
-    || task13_fail "disposable unavailable session dependency did not fail closed with 503"
+  [[ "$session_status" == 401 ]] \
+    || task13_fail "server session route did not fail closed before OIDC authentication"
   if grep -Fq "$TASK13_SECRET_VALUE" "$TASK13_TMP/server-sessions.out"; then
     task13_fail "server session failure exposed the fixture secret"
   fi
+  diagnostics="$TASK13_TMP/server-auth-diagnostics.json"
+  set +e
+  "$TASK13_THT" --installation "$TASK13_INSTALLATION" auth check --json >"$diagnostics" 2>>"$TASK13_LOG"
+  diagnostic_status=$?
+  set -e
+  [[ "$diagnostic_status" == 1 ]] || task13_fail "fake OIDC diagnostics did not fail closed"
+  node -e 'const value=JSON.parse(require("fs").readFileSync(process.argv[1], "utf8")); if(value.mode!=="oidc"||value.ready!==false||!value.checks.some((item)=>item.code==="oidc_discovery_unreachable")) process.exit(1)' "$diagnostics" \
+    || task13_fail "fake OIDC fixture did not produce the expected static diagnostic"
+  if grep -Fq "$TASK13_OIDC_CLIENT_SECRET" "$diagnostics" || grep -Fq "$TASK13_AUTHENTIK_API_TOKEN" "$diagnostics"; then
+    task13_fail "OIDC diagnostics exposed a fixture secret"
+  fi
 }
 
 task13_registry_status() {
@@ -1535,24 +1615,6 @@ task13_self_test_server_release_contract() {
     || task13_fail "workflow lacks an outer timeout for the Linux server smoke"
 }
 
-task13_self_test_server_auth_hop_contract() {
-  local joined
-  task13_server_auth_headers
-  joined="${TASK13_SERVER_AUTH_HEADERS[*]}"
-  for header in \
-    x-thoth-trusted-principal-issuer \
-    x-thoth-trusted-principal-subject \
-    x-thoth-trusted-principal-display-name \
-    x-thoth-trusted-is-admin; do
-    [[ "$joined" == *"$header:"* ]] \
-      || task13_fail "server smoke omits trusted frontend hop header: $header"
-  done
-  [[ "$joined" == *'x-thoth-trusted-is-admin: 0'* ]] \
-    || task13_fail "server smoke admin claim is not the exact non-admin value"
-  [[ "$joined" != *'x-thoth-principal-issuer:'* ]] \
-    || task13_fail "server smoke sends public identity headers to the frontend hop"
-}
-
 task13_self_test_source_contract() {
   local root host_network push_command registry_function workflow uses_count pinned_uses_count
   root="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd -P)"
@@ -1616,7 +1678,6 @@ task13_self_test() {
   task13_self_test_internal_semantic_offline_contract
   task13_self_test_windows_release_contract
   task13_self_test_server_release_contract
-  task13_self_test_server_auth_hop_contract
   task13_self_test_source_contract
   printf 'Task 13 smoke safety contracts passed.\n'
 }
@@ -1633,7 +1694,6 @@ task13_self_test_case() {
     semantic-offline) task13_self_test_internal_semantic_offline_contract ;;
     windows) task13_self_test_windows_release_contract ;;
     server) task13_self_test_server_release_contract ;;
-    server-auth) task13_self_test_server_auth_hop_contract ;;
     server-diagnostics) task13_self_test_server_workspace_diagnostics ;;
     *) task13_fail "unknown Task 13 self-test case: $1" ;;
   esac
@@ -1708,6 +1768,12 @@ task13_initialize() {
   TASK13_OVERRIDE="$TASK13_TMP/compose.task13.yaml"
   TASK13_PI_AUTH="$TASK13_TMP/pi-auth.json"
   TASK13_SECRETS="$TASK13_TMP/thothii.secrets"
+  TASK13_AUTH_ROOT="$TASK13_TMP/auth"
+  TASK13_AUTH_PASSWORD_FILE="$TASK13_TMP/local-auth-password"
+  TASK13_AUTH_ADMIN=task13-admin
+  TASK13_AUTH_PASSWORD="task13-auth-$TASK13_RUN_ID"
+  TASK13_OIDC_CLIENT_SECRET="task13-oidc-client-$TASK13_RUN_ID"
+  TASK13_AUTHENTIK_API_TOKEN="task13-authentik-token-$TASK13_RUN_ID"
   TASK13_PI_MODELS="$TASK13_TMP/models.json"
   TASK13_PI_SETTINGS="$TASK13_TMP/pi-settings.json"
   TASK13_LLM_SERVER="$TASK13_TMP/fake-llm.mjs"
@@ -1729,10 +1795,11 @@ task13_initialize() {
   TASK13_SESSION_CA="$TASK13_TMP/session-ca.pem"
   TASK13_SESSION_PASSWORD="task13-runtime-$TASK13_RUN_ID"
   TASK13_SESSION_MIGRATOR_PASSWORD="task13-migrator-$TASK13_RUN_ID"
+  TASK13_FRONTEND_PORT=""
 }
 
 task13_require_tools() {
-  for command in bash git docker curl sed awk grep rg sort; do
+  for command in bash git docker curl node sed awk grep rg sort; do
     command -v "$command" >/dev/null 2>&1 || task13_fail "$command is required"
   done
   task13_run_logged "Docker daemon readiness" docker info
@@ -1745,10 +1812,13 @@ task13_smoke_main() {
   [[ "$mode" == full || "$mode" == update ]] || task13_fail "unknown Task 13 smoke mode: $mode"
   task13_initialize
   task13_require_tools
+  TASK13_FRONTEND_PORT="$(node -e 'const net=require("node:net"); const server=net.createServer(); server.listen(0,"127.0.0.1",()=>{process.stdout.write(String(server.address().port)); server.close()})')"
+  [[ "$TASK13_FRONTEND_PORT" =~ ^[1-9][0-9]*$ ]] || task13_fail "could not reserve a loopback frontend port"
   task13_write_fixture_files
   task13_write_environment /fixtures/remote.git
   task13_seed_registry
   task13_build_tht
+  task13_configure_local_authentication
   task13_start_stack
   task13_assert_project_ownership
   task13_assert_built_image_ownership
@@ -1767,6 +1837,8 @@ task13_server_smoke_main() {
   task13_require_tools
   task13_write_server_fixture_files
   task13_seed_registry
+  task13_build_tht
+  task13_configure_server_oidc_authentication
   task13_start_server_stack
   task13_assert_project_ownership
   task13_assert_built_image_ownership
diff --git a/tools/tht/cmd/tht/main.go b/tools/tht/cmd/tht/main.go
index 4f03019e..fa79b1ff 100644
--- a/tools/tht/cmd/tht/main.go
+++ b/tools/tht/cmd/tht/main.go
@@ -364,6 +364,26 @@ func parseSetupArgs(args []string) (setup.Request, error) {
 				target = &request.Answers.GitSSHKeyFile
 			case "--git-known-hosts-file":
 				target = &request.Answers.GitKnownHostsFile
+			case "--auth-mode":
+				target = &request.Answers.AuthMode
+			case "--auth-public-url":
+				target = &request.Answers.AuthPublicURL
+			case "--auth-admin-user":
+				target = &request.Answers.AuthAdminUser
+			case "--auth-admin-display-name":
+				target = &request.Answers.AuthAdminDisplayName
+			case "--auth-password-file":
+				target = &request.Answers.AuthPasswordFile
+			case "--auth-issuer":
+				target = &request.Answers.AuthIssuer
+			case "--auth-client-id":
+				target = &request.Answers.AuthClientID
+			case "--auth-authentik-base-url":
+				target = &request.Answers.AuthAuthentikBaseURL
+			case "--auth-user-group":
+				target = &request.Answers.AuthUserGroup
+			case "--auth-admin-group":
+				target = &request.Answers.AuthAdminGroup
 			default:
 				return setup.Request{}, fmt.Errorf("unknown setup option %q", flag)
 			}
diff --git a/tools/tht/cmd/tht/main_test.go b/tools/tht/cmd/tht/main_test.go
index dc18ef6b..c5099280 100644
--- a/tools/tht/cmd/tht/main_test.go
+++ b/tools/tht/cmd/tht/main_test.go
@@ -43,6 +43,22 @@ func TestBackupCommandParsesSafeTransactionalOptions(t *testing.T) {
 	}
 }
 
+func TestSetupArgumentsRequireCompleteNonInteractiveAuthenticationInputs(t *testing.T) {
+	request, err := parseSetupArgs([]string{
+		"--non-interactive", "--auth-mode", "local", "--auth-public-url", "http://127.0.0.1:8080",
+		"--auth-admin-user", "admin", "--auth-admin-display-name", "Initial Admin", "--auth-password-file", "/protected/password",
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if request.Answers.AuthMode != "local" || request.Answers.AuthPasswordFile != "/protected/password" {
+		t.Fatalf("setup request = %#v", request)
+	}
+	if _, err := parseSetupArgs([]string{"--auth-mode", "local", "--auth-mode", "oidc"}); err == nil {
+		t.Fatal("duplicate --auth-mode was accepted")
+	}
+}
+
 func TestBackupCommandDispatchesWithoutDockerAndPrintsCustodyWarning(t *testing.T) {
 	installation := config.Installation{Path: "/tmp/thothii-installation.yaml"}
 	var received backup.CreateRequest
@@ -1469,7 +1485,7 @@ case " $* " in
     if [ -n "${THT_FAKE_CONFIG:-}" ]; then
       printf '%s\n' "$THT_FAKE_CONFIG"
     else
-      printf '%s\n' '{"volumes":{"settings":{},"pi-state":{},"workspace-registry":{},"workspace-secrets":{},"sessions":{},"qdrant-data":{},"embedding-models":{}},"services":{"core":{"image":"thothii-core:local","environment":{"THT_LLM_URL":"https://llm.example.invalid"}}}}'
+      printf '%s\n' '{"volumes":{"settings":{},"pi-state":{},"workspace-registry":{},"workspace-secrets":{},"sessions":{},"qdrant-data":{},"embedding-models":{},"auth-state":{}},"services":{"core":{"image":"thothii-core:local","environment":{"THT_LLM_URL":"https://llm.example.invalid"}}}}'
     fi ;;
   *" run --rm --no-deps --no-TTY session-migrate "*)
     if [ "${THT_FAKE_MIGRATION_EXIT:-0}" -ne 0 ]; then
diff --git a/tools/tht/internal/backup/create.go b/tools/tht/internal/backup/create.go
index 1c22f8d8..080e6443 100644
--- a/tools/tht/internal/backup/create.go
+++ b/tools/tht/internal/backup/create.go
@@ -21,7 +21,9 @@ import (
 	"github.com/aritmolab/thothii/tools/tht/internal/compose"
 	"github.com/aritmolab/thothii/tools/tht/internal/config"
 	"github.com/aritmolab/thothii/tools/tht/internal/lifecycle"
+	"github.com/aritmolab/thothii/tools/tht/internal/safeio"
 	"github.com/aritmolab/thothii/tools/tht/internal/service"
+	"gopkg.in/yaml.v3"
 )
 
 var (
@@ -130,6 +132,10 @@ func createWithDependencies(ctx context.Context, installation config.Installatio
 	if err != nil {
 		return Result{}, fmt.Errorf("installation external secret references could not be read: %w", err)
 	}
+	authenticationPaths, err := authenticationConfigFiles(installation)
+	if err != nil {
+		return Result{}, err
+	}
 	revision, err := dependencies.revision(ctx, installation.ProjectDirectory)
 	if err != nil {
 		return Result{}, err
@@ -208,12 +214,12 @@ func createWithDependencies(ctx context.Context, installation config.Installatio
 		InstallationID:  installationID,
 		CreatedAt:       dependencies.now().UTC(),
 		SourceRevision:  revision,
-		IncludesSecrets: request.IncludeSecrets && len(secretPaths) > 0,
+		IncludesSecrets: request.IncludeSecrets && len(secretPaths)+len(authenticationPaths) > 0,
 		ComposeProject:  installation.ProjectName(),
 		Images:          images,
 		Volumes:         volumes,
 	}
-	if err := writeArchive(ctx, output, reservation, installation, request, secretPaths, manifest, volumes, dependencies); err != nil {
+	if err := writeArchive(ctx, output, reservation, installation, request, secretPaths, authenticationPaths, manifest, volumes, dependencies); err != nil {
 		return Result{}, err
 	}
 	published = true
@@ -228,8 +234,8 @@ func createWithDependencies(ctx context.Context, installation config.Installatio
 		maintenanceActive = false
 	}
 	result = Result{Path: output}
-	if request.IncludeSecrets {
-		result.Warning = "The archive contains external secret files. Protect its custody and access."
+	if manifest.IncludesSecrets {
+		result.Warning = "The archive contains external secret files, including authentication configuration. Protect its custody and access."
 	}
 	return result, nil
 }
@@ -631,7 +637,7 @@ func runCompose(ctx context.Context, installation config.Installation, runner ar
 	return nil
 }
 
-func writeArchive(ctx context.Context, output string, reservation *archiveReservation, installation config.Installation, request CreateRequest, secretPaths []string, manifest Manifest, volumes []VolumeMetadata, dependencies dependencies) (resultErr error) {
+func writeArchive(ctx context.Context, output string, reservation *archiveReservation, installation config.Installation, request CreateRequest, secretPaths, authenticationPaths []string, manifest Manifest, volumes []VolumeMetadata, dependencies dependencies) (resultErr error) {
 	directory := filepath.Dir(output)
 	temporary, err := os.CreateTemp(directory, ".tht-backup-*.tmp")
 	if err != nil {
@@ -732,6 +738,23 @@ func writeArchive(ctx context.Context, output string, reservation *archiveReserv
 			SourcePath: source, SHA256: "sha256:" + hex.EncodeToString(hash.Sum(nil)), Size: size, Sensitive: true,
 		})
 	}
+	for index, source := range authenticationPaths {
+		name := fmt.Sprintf("authentication-secrets/%03d-%s", index, filepath.Base(source))
+		if request.IncludeSecrets {
+			if err := addFile(name, "authentication-configuration", true, source); err != nil {
+				return err
+			}
+			entry := &manifest.Entries[len(manifest.Entries)-1]
+			entry.Kind, entry.SourcePath, entry.Sensitive = EntryExternalSecret, source, true
+			continue
+		}
+		if filepath.Base(source) != "auth.yaml" {
+			continue
+		}
+		if err := addAuthenticationReference(&manifest, name, source); err != nil {
+			return err
+		}
+	}
 	for _, volume := range volumes {
 		headerName := "volumes/" + volume.LogicalName + ".tar"
 		header := &zip.FileHeader{Name: headerName, Method: zip.Deflate}
@@ -804,6 +827,51 @@ func configurationInputs(installation config.Installation) []configurationInput
 	return inputs
 }
 
+const maxAuthenticationConfigurationBytes = 1 << 20
+
+func authenticationConfigFiles(installation config.Installation) ([]string, error) {
+	directory := installation.AuthenticationDirectory()
+	if directory == "" {
+		return nil, nil
+	}
+	if err := safeio.ValidatePrivateDirectory(directory); err != nil {
+		return nil, errors.New("authentication configuration directory is unavailable or unsafe")
+	}
+	authPath := filepath.Join(directory, "auth.yaml")
+	contents, err := safeio.ReadCanonicalRegular(authPath, maxAuthenticationConfigurationBytes)
+	if err != nil {
+		return nil, errors.New("authentication configuration is unavailable or unsafe")
+	}
+	var configuration struct {
+		Mode string `yaml:"mode"`
+	}
+	if err := yaml.Unmarshal(contents, &configuration); err != nil || (configuration.Mode != "local" && configuration.Mode != "oidc") {
+		return nil, errors.New("authentication configuration is unavailable or invalid")
+	}
+	paths := []string{authPath}
+	if configuration.Mode == "local" {
+		usersPath := filepath.Join(directory, "users.yaml")
+		if _, err := safeio.ReadCanonicalRegular(usersPath, maxAuthenticationConfigurationBytes); err != nil {
+			return nil, errors.New("authentication user registry is unavailable or unsafe")
+		}
+		paths = append(paths, usersPath)
+	}
+	return paths, nil
+}
+
+func addAuthenticationReference(manifest *Manifest, name, source string) error {
+	contents, err := safeio.ReadCanonicalRegular(source, maxAuthenticationConfigurationBytes)
+	if err != nil {
+		return errors.New("authentication configuration is unavailable or unsafe")
+	}
+	digest := sha256.Sum256(contents)
+	manifest.Entries = append(manifest.Entries, Entry{
+		Path: name, Kind: EntrySecretReference, Owner: "authentication-configuration", SourcePath: source,
+		SHA256: "sha256:" + hex.EncodeToString(digest[:]), Size: int64(len(contents)), Sensitive: true,
+	})
+	return nil
+}
+
 func volumeArchiveCommand(volume string) []string {
 	return []string{"run", "--rm", "--network", "none", "--mount", "type=volume,src=" + volume + ",dst=/source,readonly", helperImage, "tar", "--numeric-owner", "-C", "/source", "-cf", "-", "."}
 }
@@ -837,6 +905,10 @@ func archivePreservationRoots(installation config.Installation, secretPaths []st
 		if err != nil || !info.IsDir() {
 			return errors.New("server preservation root is unavailable")
 		}
+		authStateRoot := ""
+		if variable == "THT_DATA_ROOT" {
+			authStateRoot = filepath.Join(root, "auth")
+		}
 		err = filepath.WalkDir(root, func(path string, entry os.DirEntry, walkErr error) error {
 			if walkErr != nil {
 				return walkErr
@@ -847,6 +919,12 @@ func archivePreservationRoots(installation config.Installation, secretPaths []st
 				}
 				return nil
 			}
+			if authStateRoot != "" && path == authStateRoot {
+				if entry.IsDir() {
+					return filepath.SkipDir
+				}
+				return nil
+			}
 			if entry.Type()&os.ModeSymlink != 0 {
 				return errors.New("server preservation root contains a symlink")
 			}
diff --git a/tools/tht/internal/backup/create_test.go b/tools/tht/internal/backup/create_test.go
index 0e0ebcad..5ea50a3e 100644
--- a/tools/tht/internal/backup/create_test.go
+++ b/tools/tht/internal/backup/create_test.go
@@ -70,6 +70,75 @@ func TestCreateWritesManifestLastWithConfigurationMetadataAndSevenVolumes(t *tes
 	}
 }
 
+func TestCreateReferencesAuthFilesByDefaultAndArchivesThemOnlyWithSecretCustody(t *testing.T) {
+	fixture := newBackupFixture(t, "local")
+	authDirectory := filepath.Join(filepath.Dir(fixture.installation.Path), "auth")
+	if err := os.Mkdir(authDirectory, 0o700); err != nil {
+		t.Fatal(err)
+	}
+	authPath := filepath.Join(authDirectory, "auth.yaml")
+	usersPath := filepath.Join(authDirectory, "users.yaml")
+	if err := os.WriteFile(authPath, []byte("version: 1\nmode: local\n"), 0o600); err != nil {
+		t.Fatal(err)
+	}
+	if err := os.WriteFile(usersPath, []byte("users:\n  - passwordHash: must-not-be-archived-by-default\n"), 0o600); err != nil {
+		t.Fatal(err)
+	}
+	fixture.installation.Authentication.ConfigDirectory = authDirectory
+
+	defaultOutput := filepath.Join(t.TempDir(), "default.zip")
+	defaultResult, err := createWithDependencies(context.Background(), fixture.installation, CreateRequest{Output: defaultOutput}, testDependencies(t, newBackupRunner(fixture.installation, false)))
+	if err != nil {
+		t.Fatal(err)
+	}
+	if defaultResult.Warning != "" {
+		t.Fatalf("default backup warning = %q, want no custody warning", defaultResult.Warning)
+	}
+	defaultArchive := readFixtureArchive(t, defaultOutput)
+	defaultBytes := bytes.Join(mapValues(defaultArchive.files), nil)
+	for _, value := range []string{"mode: local", "must-not-be-archived-by-default"} {
+		if bytes.Contains(defaultBytes, []byte(value)) {
+			t.Fatalf("default backup contains authentication content %q", value)
+		}
+	}
+	if !manifestHasReference(defaultArchive.manifest, authPath) || manifestHasReference(defaultArchive.manifest, usersPath) {
+		t.Fatalf("default backup did not record only the auth.yaml configuration path: %#v", defaultArchive.manifest.Entries)
+	}
+
+	secretOutput := filepath.Join(t.TempDir(), "with-auth-secrets.zip")
+	secretResult, err := createWithDependencies(context.Background(), fixture.installation, CreateRequest{Output: secretOutput, IncludeSecrets: true, Confirm: true}, testDependencies(t, newBackupRunner(fixture.installation, false)))
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !strings.Contains(secretResult.Warning, "custody") {
+		t.Fatalf("secret backup warning = %q, want custody guidance", secretResult.Warning)
+	}
+	secretArchive := readFixtureArchive(t, secretOutput)
+	for _, path := range []string{authPath, usersPath} {
+		if !manifestHasArchivedSecret(secretArchive.manifest, path) {
+			t.Fatalf("secret backup did not archive authentication file %q", path)
+		}
+	}
+}
+
+func manifestHasReference(manifest Manifest, sourcePath string) bool {
+	for _, entry := range manifest.Entries {
+		if entry.Kind == EntrySecretReference && entry.SourcePath == sourcePath && !entry.Archived {
+			return true
+		}
+	}
+	return false
+}
+
+func manifestHasArchivedSecret(manifest Manifest, sourcePath string) bool {
+	for _, entry := range manifest.Entries {
+		if entry.Kind == EntryExternalSecret && entry.SourcePath == sourcePath && entry.Archived && entry.Sensitive {
+			return true
+		}
+	}
+	return false
+}
+
 func TestCreateRestartsAndVerifiesAnInstallationThatWasRunning(t *testing.T) {
 	fixture := newBackupFixture(t, "local")
 	runner := newBackupRunner(fixture.installation, true)
diff --git a/tools/tht/internal/backup/restore.go b/tools/tht/internal/backup/restore.go
index ce045bbf..609d8887 100644
--- a/tools/tht/internal/backup/restore.go
+++ b/tools/tht/internal/backup/restore.go
@@ -27,18 +27,19 @@ type RestoreResult struct {
 	Verified   bool
 }
 
-type restoreLock interface { Release() error }
+type restoreLock interface{ Release() error }
 type restoreVerify func(context.Context, config.Installation, archiveRunner) error
 
 type restoreDependencies struct {
-	preflight     func(context.Context, config.Installation, PreflightRequest) (PreflightResult, error)
-	checkpoint    func(context.Context, config.Installation, CreateRequest) (Result, error)
-	acquireLock   func(config.Installation) (restoreLock, error)
-	runner        archiveRunner
-	sleep         func(duration time.Duration)
-	restoreFile   func(context.Context, config.Installation, ArchiveEntryMetadata, io.Reader) error
-	restoreVolume func(context.Context, config.Installation, VolumeMetadata, io.Reader) error
-	verify        map[string]restoreVerify
+	preflight                func(context.Context, config.Installation, PreflightRequest) (PreflightResult, error)
+	checkpoint               func(context.Context, config.Installation, CreateRequest) (Result, error)
+	acquireLock              func(config.Installation) (restoreLock, error)
+	runner                   archiveRunner
+	sleep                    func(duration time.Duration)
+	restoreFile              func(context.Context, config.Installation, ArchiveEntryMetadata, io.Reader) error
+	restoreVolume            func(context.Context, config.Installation, VolumeMetadata, io.Reader) error
+	resetAuthenticationState func(context.Context, config.Installation, archiveRunner) error
+	verify                   map[string]restoreVerify
 }
 
 // Restore runs the host transaction. Concrete host dependencies are intentionally kept outside
@@ -48,60 +49,126 @@ func Restore(ctx context.Context, installation config.Installation, request Rest
 }
 
 func restoreWithDependencies(ctx context.Context, installation config.Installation, request RestoreRequest, deps restoreDependencies) (result RestoreResult, resultErr error) {
-	if !request.Confirm { return RestoreResult{}, ErrRestoreConfirmationRequired }
-	if request.Archive == "" { return RestoreResult{}, errors.New("restore archive is required") }
-	if deps.preflight == nil || deps.checkpoint == nil || deps.acquireLock == nil || deps.runner == nil || deps.restoreFile == nil || deps.restoreVolume == nil || deps.verify == nil {
+	if !request.Confirm {
+		return RestoreResult{}, ErrRestoreConfirmationRequired
+	}
+	if request.Archive == "" {
+		return RestoreResult{}, errors.New("restore archive is required")
+	}
+	if deps.preflight == nil || deps.checkpoint == nil || deps.acquireLock == nil || deps.runner == nil || deps.restoreFile == nil || deps.restoreVolume == nil || deps.resetAuthenticationState == nil || deps.verify == nil {
 		return RestoreResult{}, errors.New("restore dependencies are incomplete")
 	}
 	preflight, err := deps.preflight(ctx, installation, PreflightRequest{Archive: request.Archive, Confirm: true, AllowExternalSecrets: true})
-	if err != nil { return RestoreResult{}, err }
+	if err != nil {
+		return RestoreResult{}, err
+	}
 	defer preflight.CloseArchive()
 	archive, err := preflight.RevalidateArchive()
-	if err != nil { return RestoreResult{}, err }
+	if err != nil {
+		return RestoreResult{}, err
+	}
 
 	checkpoint, err := deps.checkpoint(ctx, installation, CreateRequest{})
-	if err != nil { return RestoreResult{}, fmt.Errorf("create recovery checkpoint: %w", err) }
+	if err != nil {
+		return RestoreResult{}, fmt.Errorf("create recovery checkpoint: %w", err)
+	}
 	result.Checkpoint = checkpoint.Path
 	lock, err := deps.acquireLock(installation)
-	if err != nil { return result, err }
-	defer func() { if releaseErr := lock.Release(); releaseErr != nil && resultErr == nil { resultErr = releaseErr } }()
+	if err != nil {
+		return result, err
+	}
+	defer func() {
+		if releaseErr := lock.Release(); releaseErr != nil && resultErr == nil {
+			resultErr = releaseErr
+		}
+	}()
 
 	wasRunning, err := installationRunning(ctx, installation, deps.runner)
-	if err != nil { return result, err }
+	if err != nil {
+		return result, err
+	}
 	mutated := false
 	defer func() {
-		if resultErr != nil && mutated { _ = runCompose(context.Background(), installation, deps.runner, "stop") }
+		if resultErr != nil && mutated {
+			_ = runCompose(context.Background(), installation, deps.runner, "stop")
+		}
 	}()
 	if wasRunning {
-		if err := maintenance(ctx, installation, deps.runner, true); err != nil { return result, err }
-		if err := waitForNoActiveSessions(ctx, installation, deps.runner, request.Drain, deps.sleep); err != nil { return result, err }
-		if err := runCompose(ctx, installation, deps.runner, "stop"); err != nil { return result, err }
+		if err := maintenance(ctx, installation, deps.runner, true); err != nil {
+			return result, err
+		}
+		if err := waitForNoActiveSessions(ctx, installation, deps.runner, request.Drain, deps.sleep); err != nil {
+			return result, err
+		}
+		if err := runCompose(ctx, installation, deps.runner, "stop"); err != nil {
+			return result, err
+		}
 	}
 	reader, err := zip.NewReader(archive, preflight.ArchiveSize)
-	if err != nil { return result, fmt.Errorf("read verified restore archive: %w", err) }
+	if err != nil {
+		return result, fmt.Errorf("read verified restore archive: %w", err)
+	}
 	members := make(map[string]*zip.File, len(reader.File))
-	for _, member := range reader.File { members[member.Name] = member }
+	for _, member := range reader.File {
+		members[member.Name] = member
+	}
 	for _, entry := range preflight.Entries {
-		if entry.Kind == EntryVolume { continue }
+		if entry.Kind == EntryVolume {
+			continue
+		}
 		member := members[entry.Path]
-		if member == nil { return result, fmt.Errorf("verified archive is missing %q", entry.Path) }
+		if member == nil {
+			return result, fmt.Errorf("verified archive is missing %q", entry.Path)
+		}
 		stream, openErr := member.Open()
-		if openErr != nil { return result, fmt.Errorf("open verified archive member %q: %w", entry.Path, openErr) }
+		if openErr != nil {
+			return result, fmt.Errorf("open verified archive member %q: %w", entry.Path, openErr)
+		}
 		mutated = true
 		restoreErr := deps.restoreFile(ctx, installation, entry, stream)
 		closeErr := stream.Close()
-		if restoreErr != nil { return result, restoreErr }
-		if closeErr != nil { return result, closeErr }
+		if restoreErr != nil {
+			return result, restoreErr
+		}
+		if closeErr != nil {
+			return result, closeErr
+		}
+	}
+	if err := deps.resetAuthenticationState(ctx, installation, deps.runner); err != nil {
+		return result, fmt.Errorf("reset authentication state: %w", err)
 	}
 	if wasRunning {
-		if err := composeStartAndVerify(ctx, installation, deps.runner); err != nil { return result, err }
+		if err := composeStartAndVerify(ctx, installation, deps.runner); err != nil {
+			return result, err
+		}
 		result.Restarted = true
 	}
 	for _, name := range []string{"health", "doctor", "pi", "workspace"} {
 		check := deps.verify[name]
-		if check == nil { return result, fmt.Errorf("restore verification %q is unavailable", name) }
-		if err := check(ctx, installation, deps.runner); err != nil { return result, fmt.Errorf("restore verification %s: %w", name, err) }
+		if check == nil {
+			return result, fmt.Errorf("restore verification %q is unavailable", name)
+		}
+		if err := check(ctx, installation, deps.runner); err != nil {
+			return result, fmt.Errorf("restore verification %s: %w", name, err)
+		}
 	}
 	result.Verified = true
 	return result, nil
 }
+
+// resetAuthenticationState clears browser sessions and pending OIDC transactions without touching
+// installation-global auth.yaml or users.yaml. The command runs as the unprivileged core user so
+// the recreated state root is private to the service on both the local volume and server /data bind.
+func resetAuthenticationState(ctx context.Context, installation config.Installation, runner archiveRunner) error {
+	result, err := runner.Run(ctx, installation.ComposeArgs(
+		"run", "--rm", "--no-deps", "--no-TTY", "--entrypoint", "sh", "core", "-ceu",
+		"rm -rf /data/auth && install -d -m 0700 /data/auth /data/auth/sessions /data/auth/oidc",
+	), nil)
+	if err != nil {
+		return dockerError("reset authentication state", result, err)
+	}
+	if result.ExitCode != 0 {
+		return dockerError("reset authentication state", result, errors.New("Compose returned a nonzero exit status"))
+	}
+	return nil
+}
diff --git a/tools/tht/internal/backup/restore_test.go b/tools/tht/internal/backup/restore_test.go
index ee85b11d..4600f4ed 100644
--- a/tools/tht/internal/backup/restore_test.go
+++ b/tools/tht/internal/backup/restore_test.go
@@ -59,6 +59,58 @@ func TestRestoreStoppedInstallationRunsCheckpointRestoreAndVerification(t *testi
 	}
 }
 
+func TestRestoreResetsAuthenticationStateBeforeRestart(t *testing.T) {
+	installation := preflightTestInstallation(t)
+	archive := restoreArchive(t)
+	runner := newBackupRunner(installation, true)
+	deps := restoreTestDependencies(t, runner)
+	var events []string
+	deps.restoreFile = func(_ context.Context, _ config.Installation, entry ArchiveEntryMetadata, _ io.Reader) error {
+		events = append(events, "file:"+entry.Path)
+		return nil
+	}
+	deps.resetAuthenticationState = func(context.Context, config.Installation, archiveRunner) error {
+		events = append(events, "reset-auth-state")
+		return nil
+	}
+	for _, name := range []string{"health", "doctor", "pi", "workspace"} {
+		name := name
+		deps.verify[name] = func(context.Context, config.Installation, archiveRunner) error {
+			events = append(events, name)
+			return nil
+		}
+	}
+
+	result, err := restoreWithDependencies(context.Background(), installation, RestoreRequest{Archive: archive, Confirm: true}, deps)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !result.Restarted || !result.Verified {
+		t.Fatalf("restore result = %#v", result)
+	}
+	if got, want := events, []string{"file:configuration/operator.env", "reset-auth-state", "health", "doctor", "pi", "workspace"}; !equalStrings(got, want) {
+		t.Fatalf("restore events = %v, want %v", got, want)
+	}
+}
+
+func TestResetAuthenticationStateCreatesOnlyPrivateEmptyStateDirectories(t *testing.T) {
+	installation := preflightTestInstallation(t)
+	runner := &authenticationStateResetRunner{}
+
+	if err := resetAuthenticationState(context.Background(), installation, runner); err != nil {
+		t.Fatal(err)
+	}
+	joined := strings.Join(runner.args, "\x00")
+	for _, required := range []string{
+		"run", "--rm", "--no-deps", "--no-TTY", "--entrypoint", "sh", "core", "-ceu",
+		"rm -rf /data/auth && install -d -m 0700 /data/auth /data/auth/sessions /data/auth/oidc",
+	} {
+		if !strings.Contains(joined, required) {
+			t.Fatalf("authentication state reset command omits %q: %#v", required, runner.args)
+		}
+	}
+}
+
 func TestRestorePreflightFailureDoesNotMutateTarget(t *testing.T) {
 	installation := preflightTestInstallation(t)
 	runner := newBackupRunner(installation, true)
@@ -213,6 +265,19 @@ type fakeRestoreLock struct {
 	release func()
 }
 
+type authenticationStateResetRunner struct{ args []string }
+
+func (runner *authenticationStateResetRunner) Run(_ context.Context, args []string, _ io.Reader) (compose.Result, error) {
+	runner.args = append([]string(nil), args...)
+	return compose.Result{}, nil
+}
+
+func (runner *authenticationStateResetRunner) Stream(context.Context, []string, io.Reader, io.Writer) (compose.Result, error) {
+	return compose.Result{}, errors.New("authentication state reset must not stream a volume archive")
+}
+
+func (*authenticationStateResetRunner) SessionInventoryScope() string { return "mine" }
+
 func (lock fakeRestoreLock) Release() error {
 	if lock.release != nil {
 		lock.release()
@@ -248,6 +313,9 @@ func restoreTestDependencies(t *testing.T, runner archiveRunner) restoreDependen
 		restoreVolume: func(context.Context, config.Installation, VolumeMetadata, io.Reader) error {
 			return nil
 		},
+		resetAuthenticationState: func(context.Context, config.Installation, archiveRunner) error {
+			return nil
+		},
 		verify: map[string]restoreVerify{
 			"health":    func(context.Context, config.Installation, archiveRunner) error { return nil },
 			"doctor":    func(context.Context, config.Installation, archiveRunner) error { return nil },
diff --git a/tools/tht/internal/doctor/report.go b/tools/tht/internal/doctor/report.go
index 574870a6..c492eba2 100644
--- a/tools/tht/internal/doctor/report.go
+++ b/tools/tht/internal/doctor/report.go
@@ -353,7 +353,7 @@ func filePermissions(installation config.Installation) error {
 	return nil
 }
 
-// ValidateVolumes checks the seven persistent volumes required by a ThothII installation.
+// ValidateVolumes checks the eight persistent volumes required by a local ThothII installation.
 func ValidateVolumes(rendered string) error {
 	var document struct {
 		Volumes map[string]json.RawMessage `json:"volumes"`
@@ -361,7 +361,7 @@ func ValidateVolumes(rendered string) error {
 	if err := json.Unmarshal([]byte(rendered), &document); err != nil {
 		return errors.New("Compose returned invalid rendered configuration")
 	}
-	for _, name := range []string{"settings", "pi-state", "workspace-registry", "workspace-secrets", "sessions", "qdrant-data", "embedding-models"} {
+	for _, name := range []string{"settings", "pi-state", "workspace-registry", "workspace-secrets", "sessions", "qdrant-data", "embedding-models", "auth-state"} {
 		if _, exists := document.Volumes[name]; !exists {
 			return fmt.Errorf("rendered Compose configuration is missing required volume %s", name)
 		}
diff --git a/tools/tht/internal/doctor/report_test.go b/tools/tht/internal/doctor/report_test.go
index e255b693..1d844d04 100644
--- a/tools/tht/internal/doctor/report_test.go
+++ b/tools/tht/internal/doctor/report_test.go
@@ -27,6 +27,17 @@ func TestRunReportsUnavailableDockerWithoutReturningAnExecutionError(t *testing.
 	}
 }
 
+func TestValidateVolumesRequiresAuthState(t *testing.T) {
+	legacy := `{"volumes":{"settings":{},"pi-state":{},"workspace-registry":{},"workspace-secrets":{},"sessions":{},"qdrant-data":{},"embedding-models":{}}}`
+	if err := ValidateVolumes(legacy); err == nil || !strings.Contains(err.Error(), "auth-state") {
+		t.Fatalf("ValidateVolumes() error = %v, want missing auth-state", err)
+	}
+	withAuthState := `{"volumes":{"settings":{},"pi-state":{},"workspace-registry":{},"workspace-secrets":{},"sessions":{},"qdrant-data":{},"embedding-models":{},"auth-state":{}}}`
+	if err := ValidateVolumes(withAuthState); err != nil {
+		t.Fatalf("ValidateVolumes() error = %v, want complete volume set", err)
+	}
+}
+
 // Catches Docker availability short-circuiting a host file-permission failure.
 func TestRunChecksUnsafeFilesEvenWhenDockerIsUnavailable(t *testing.T) {
 	installation := doctorInstallation(t, "")
@@ -327,7 +338,7 @@ func assertChecklist(t *testing.T, report Report, want []string) {
 	}
 }
 
-const renderedConfig = `{"volumes":{"settings":{},"pi-state":{},"workspace-registry":{},"workspace-secrets":{},"sessions":{},"qdrant-data":{},"embedding-models":{}},"services":{"core":{"image":"thothii-core:local","environment":{"THT_LLM_URL":"https://llm.example.invalid"}}}}`
+const renderedConfig = `{"volumes":{"settings":{},"pi-state":{},"workspace-registry":{},"workspace-secrets":{},"sessions":{},"qdrant-data":{},"embedding-models":{},"auth-state":{}},"services":{"core":{"image":"thothii-core:local","environment":{"THT_LLM_URL":"https://llm.example.invalid"}}}}`
 
 const healthyServices = `[
   {"Service":"core","State":"running","Health":"healthy"},
diff --git a/tools/tht/internal/setup/files_test.go b/tools/tht/internal/setup/files_test.go
index 75bc3e1e..6d1c43f4 100644
--- a/tools/tht/internal/setup/files_test.go
+++ b/tools/tht/internal/setup/files_test.go
@@ -65,6 +65,9 @@ func TestEnsureFilesCreatesDiscoverableConfigurationInProjectWithSpaces(t *testi
 	if err != nil {
 		t.Fatal(err)
 	}
+	if !strings.Contains(string(environment), "THT_AUTH_CONFIG_ROOT=") {
+		t.Fatalf("generated environment does not declare the authentication config root: %s", environment)
+	}
 	for _, secretValue := range []string{"super-secret-value", "pi-secret-value", "private-key-value"} {
 		if bytes.Contains(descriptor, []byte(secretValue)) || bytes.Contains(environment, []byte(secretValue)) {
 			t.Fatalf("generated configuration contains a secret value %q", secretValue)
diff --git a/tools/tht/internal/setup/request.go b/tools/tht/internal/setup/request.go
index d6156f5d..4099c83c 100644
--- a/tools/tht/internal/setup/request.go
+++ b/tools/tht/internal/setup/request.go
@@ -26,6 +26,16 @@ type Answers struct {
 	GitCAFile             string
 	GitSSHKeyFile         string
 	GitKnownHostsFile     string
+	AuthMode              string
+	AuthPublicURL         string
+	AuthAdminUser         string
+	AuthAdminDisplayName  string
+	AuthPasswordFile      string
+	AuthIssuer            string
+	AuthClientID          string
+	AuthAuthentikBaseURL  string
+	AuthUserGroup         string
+	AuthAdminGroup        string
 	CreateSecretTemplates bool
 }
 
diff --git a/tools/tht/internal/setup/run.go b/tools/tht/internal/setup/run.go
index 28edde3b..f5f1921e 100644
--- a/tools/tht/internal/setup/run.go
+++ b/tools/tht/internal/setup/run.go
@@ -11,6 +11,7 @@ import (
 	"strconv"
 	"strings"
 
+	"github.com/aritmolab/thothii/tools/tht/internal/authconfig"
 	"github.com/aritmolab/thothii/tools/tht/internal/compose"
 	"github.com/aritmolab/thothii/tools/tht/internal/config"
 	"github.com/aritmolab/thothii/tools/tht/internal/doctor"
@@ -53,6 +54,9 @@ func Run(ctx context.Context, runner compose.Runner, request Request, input io.R
 		return Result{}, fmt.Errorf("setup generated configuration is invalid: %w", err)
 	}
 	result := Result{DescriptorPath: files.DescriptorPath, ProjectName: installation.ProjectName(), Configured: true}
+	if err := configureAuthentication(ctx, installation, request, input, output); err != nil {
+		return Result{}, err
+	}
 	if err := runCompose(ctx, runner, installation, "config", "--quiet"); err != nil {
 		return Result{}, fmt.Errorf("setup Compose configuration: %w", err)
 	}
@@ -78,6 +82,76 @@ func Run(ctx context.Context, runner compose.Runner, request Request, input io.R
 	return result, nil
 }
 
+func configureAuthentication(ctx context.Context, installation config.Installation, request Request, input io.Reader, output io.Writer) error {
+	directory := installation.AuthenticationDirectory()
+	if _, _, err := authconfig.Load(directory); err == nil {
+		return nil
+	}
+	if _, err := os.Lstat(filepath.Join(directory, "auth.yaml")); !errors.Is(err, os.ErrNotExist) {
+		return errors.New("setup authentication configuration is invalid")
+	}
+	args, err := authenticationConfigureArgs(request)
+	if err != nil {
+		return err
+	}
+	if exitCode := authconfig.Run(ctx, installation, args, input, io.Discard, output); exitCode != 0 {
+		return errors.New("setup authentication configuration failed")
+	}
+	if _, _, err := authconfig.Load(directory); err != nil {
+		return errors.New("setup authentication configuration is invalid")
+	}
+	return nil
+}
+
+func authenticationConfigureArgs(request Request) ([]string, error) {
+	answers := request.Answers
+	mode := answers.AuthMode
+	if mode == "" && !request.NonInteractive {
+		mode = "local"
+	}
+	if mode != "local" && mode != "oidc" {
+		return nil, errors.New("setup requires --auth-mode local or oidc")
+	}
+	if mode == "local" && request.NonInteractive && (answers.AuthAdminUser == "" || answers.AuthAdminDisplayName == "" || answers.AuthPasswordFile == "") {
+		return nil, errors.New("non-interactive local authentication requires --auth-admin-user, --auth-admin-display-name, and --auth-password-file")
+	}
+	publicURL := answers.AuthPublicURL
+	if publicURL == "" && !request.NonInteractive && mode == "local" {
+		publicURL = "http://127.0.0.1:8080"
+	}
+	if publicURL == "" {
+		return nil, errors.New("setup requires --auth-public-url")
+	}
+	args := []string{"configure", "--mode", mode, "--public-url", publicURL}
+	if mode == "local" {
+		if answers.AuthAdminUser != "" {
+			args = append(args, "--admin-user", answers.AuthAdminUser)
+		}
+		if answers.AuthAdminDisplayName != "" {
+			args = append(args, "--admin-display-name", answers.AuthAdminDisplayName)
+		}
+		if answers.AuthPasswordFile != "" {
+			args = append(args, "--password-file", answers.AuthPasswordFile)
+		}
+		return args, nil
+	}
+	for _, option := range []struct {
+		name, value string
+	}{
+		{"--issuer", answers.AuthIssuer},
+		{"--client-id", answers.AuthClientID},
+		{"--authentik-base-url", answers.AuthAuthentikBaseURL},
+		{"--user-group", answers.AuthUserGroup},
+		{"--admin-group", answers.AuthAdminGroup},
+	} {
+		if option.value == "" {
+			return nil, errors.New("OIDC authentication requires complete provider and group options")
+		}
+		args = append(args, option.name, option.value)
+	}
+	return args, nil
+}
+
 func checkHost(ctx context.Context, runner compose.Runner, root string) error {
 	checks := []struct {
 		name string
diff --git a/tools/tht/internal/setup/run_test.go b/tools/tht/internal/setup/run_test.go
index 6410b2a5..d5a81279 100644
--- a/tools/tht/internal/setup/run_test.go
+++ b/tools/tht/internal/setup/run_test.go
@@ -11,7 +11,9 @@ import (
 	"testing"
 	"time"
 
+	"github.com/aritmolab/thothii/tools/tht/internal/authconfig"
 	"github.com/aritmolab/thothii/tools/tht/internal/compose"
+	"github.com/aritmolab/thothii/tools/tht/internal/config"
 	"github.com/aritmolab/thothii/tools/tht/internal/doctor"
 )
 
@@ -65,6 +67,55 @@ func TestRunConfigureOnlyStopsAfterRenderedConfiguration(t *testing.T) {
 	}
 }
 
+func TestRunConfiguresAndStaticallyValidatesLocalAuthBeforeComposeRender(t *testing.T) {
+	projectRoot, request := setupRunFixture(t, true)
+	passwordFile := filepath.Join(projectRoot, "initial-admin-password")
+	if err := os.WriteFile(passwordFile, []byte("correct horse battery staple"), 0o600); err != nil {
+		t.Fatal(err)
+	}
+	request.NonInteractive = true
+	request.Answers.AuthMode = "local"
+	request.Answers.AuthPublicURL = "http://127.0.0.1:8080"
+	request.Answers.AuthAdminUser = "admin"
+	request.Answers.AuthAdminDisplayName = "Initial Admin"
+	request.Answers.AuthPasswordFile = passwordFile
+	runner := &setupRunner{}
+
+	if _, err := Run(context.Background(), runner, request, strings.NewReader(""), io.Discard); err != nil {
+		t.Fatal(err)
+	}
+	installationPath := filepath.Join(projectRoot, "deploy", "ci", "thothii-installation.yaml")
+	installation, err := config.Load(installationPath)
+	if err != nil {
+		t.Fatal(err)
+	}
+	configuration, registry, err := authconfig.Load(installation.AuthenticationDirectory())
+	if err != nil {
+		t.Fatalf("setup did not create a statically valid authentication configuration: %v", err)
+	}
+	if configuration.Mode != "local" || len(registry.Users) != 1 || registry.Users[0].Username != "admin" {
+		t.Fatalf("authentication configuration = %#v registry = %#v", configuration, registry)
+	}
+	assertSetupStages(t, runner, "docker engine", "docker compose", "architecture", "compose config")
+}
+
+func TestRunRejectsIncompleteNonInteractiveLocalAuthenticationBeforeComposeRender(t *testing.T) {
+	_, request := setupRunFixture(t, true)
+	request.NonInteractive = true
+	request.Answers.AuthMode = "local"
+	request.Answers.AuthPublicURL = ""
+	request.Answers.AuthAdminUser = ""
+	request.Answers.AuthAdminDisplayName = ""
+	request.Answers.AuthPasswordFile = ""
+	runner := &setupRunner{}
+
+	_, err := Run(context.Background(), runner, request, strings.NewReader(""), io.Discard)
+	if err == nil || !strings.Contains(err.Error(), "non-interactive local authentication") {
+		t.Fatalf("Run() error = %v, want non-interactive local authentication guidance", err)
+	}
+	assertSetupStages(t, runner, "docker engine", "docker compose", "architecture")
+}
+
 func TestRunPropagatesPreflightFailureBeforeWritingConfiguration(t *testing.T) {
 	projectRoot, request := setupRunFixture(t, false)
 	runner := &setupRunner{failureAt: "docker engine"}
@@ -137,7 +188,7 @@ func TestRunPiDoctorFailurePreservesCauseAndOffersRecovery(t *testing.T) {
 }
 
 func TestRequireVolumesRequiresEveryInstallationVolume(t *testing.T) {
-	all := []string{"settings", "pi-state", "workspace-registry", "workspace-secrets", "sessions", "qdrant-data", "embedding-models"}
+	all := []string{"settings", "pi-state", "workspace-registry", "workspace-secrets", "sessions", "qdrant-data", "embedding-models", "auth-state"}
 	for _, missing := range all {
 		t.Run("missing "+missing, func(t *testing.T) {
 			volumes := make([]string, 0, len(all)-1)
@@ -301,7 +352,7 @@ func setupStage(args []string) (string, compose.Result) {
 	}
 }
 
-const renderedSetupConfig = `{"volumes":{"settings":{},"pi-state":{},"workspace-registry":{},"workspace-secrets":{},"sessions":{},"qdrant-data":{},"embedding-models":{}},"services":{"core":{"image":"thothii-core:local","environment":{"THT_LLM_URL":"https://llm.example.invalid"}}}}`
+const renderedSetupConfig = `{"volumes":{"settings":{},"pi-state":{},"workspace-registry":{},"workspace-secrets":{},"sessions":{},"qdrant-data":{},"embedding-models":{},"auth-state":{}},"services":{"core":{"image":"thothii-core:local","environment":{"THT_LLM_URL":"https://llm.example.invalid"}}}}`
 
 func renderedConfigForVolumes(volumes ...string) string {
 	entries := make([]string, 0, len(volumes))
@@ -338,12 +389,18 @@ func setupRunFixture(t *testing.T, configureOnly bool) (string, Request) {
 	if err := os.MkdirAll(secrets, 0o700); err != nil {
 		t.Fatal(err)
 	}
+	passwordFile := filepath.Join(secrets, "initial-admin-password")
+	if err := os.WriteFile(passwordFile, []byte("fixture authentication password"), 0o600); err != nil {
+		t.Fatal(err)
+	}
 	return root, Request{
 		ProjectRoot: root, InstallationID: "ci", Profile: "local", ConfigureOnly: configureOnly, NonInteractive: true,
 		Answers: Answers{
 			WorkspaceRemote: "https://git.example.invalid/thothii-workspaces.git", WorkspaceBranch: "main", WorkspaceAccess: "https",
 			SecretsFile: filepath.Join(secrets, "thothii.secrets"), PiAuthFile: filepath.Join(secrets, "pi-auth.json"),
 			GitCredentialsFile: filepath.Join(secrets, "git-credentials"), GitCAFile: filepath.Join(secrets, "git-ca.pem"),
+			AuthMode: "local", AuthPublicURL: "http://127.0.0.1:8080", AuthAdminUser: "admin",
+			AuthAdminDisplayName: "Initial Admin", AuthPasswordFile: passwordFile,
 			CreateSecretTemplates: true,
 		},
 	}