KeyCape

Prepare for Keycloak without Keycloak

KeyCape is the lightweight IAM component of NetKingdom. It implements lightweight mode for the NetKingdom IAM Profile — a versioned OIDC/PKCE contract whose canonical core is now ../net-kingdom/canon/standards/iam-profile_v0.2.md — by orchestrating Authelia, LLDAP, and privacyIDEA. The same profile is implemented by Keycloak in expanded-mode deployments.

Applications integrate against the profile, not against Keycape internals. This makes the lightweight → expanded migration a tested, automated operation rather than a rewrite.

Status

Implementation complete (v0.1). All 23 workplan tasks implemented and tested. 21 test packages, all green. See workplans/KEY-WP-0001-keycape-implementation.md.

Architecture

Application
    │  (NetKingdom IAM Profile v0.2)
    ▼
 KeyCape  ←── profile enforcement, claim normalization, telemetry
  /  |  \
Auth  LLDAP  privacyIDEA
elia

Expanded mode: Replace KeyCape with Keycloak. Same profile contract, same conformance suite in ../net-kingdom/tools/iam-profile-conformance/.

Quick Start

# Start the dev stack (KeyCape + LLDAP + Authelia + privacyIDEA)
make dev

# Build the server binary
make build

# Run all tests
make test

Configuration

KeyCape uses a YAML config file. See config/dev-config.yaml for a full example.

issuer: "https://auth.netkingdom.local"
port: 8080
tokenLifetime: "15m"
privateKeyPem: "/etc/keycape/key.pem"
environment: "production"

lldap:
  url: "ldap://lldap:389"
  bindDN: "cn=admin,dc=netkingdom,dc=local"
  bindPW: "secret"
  baseDN: "dc=netkingdom,dc=local"

authelia:
  baseURL: "http://authelia.sso.svc.cluster.local:9091"
  browserBaseURL: "https://authelia.local"
  tokenBaseURL: "http://authelia.sso.svc.cluster.local:9091"
  clientId: "keycape"
  clientSecret: "secret"
  redirectURI: "https://auth.netkingdom.local/authorize/callback"

privacyidea:
  baseURL: "https://privacyidea.local"
  adminToken: "secret"
  realm: "netkingdom"

clients:
  - clientId: "my-app"
    displayName: "My Application"
    redirectUris: ["https://myapp.local/callback"]
    allowedScopes: ["openid", "profile", "email", "groups"]
    grantTypes: ["authorization_code"]
    clientType: "public"
  - clientId: "netkingdom-bootstrap-console"
    displayName: "NetKingdom Bootstrap Console"
    redirectUris:
      - "http://127.0.0.1:8876/oidc/callback"
      - "http://localhost:8876/oidc/callback"
    allowedScopes: ["openid", "profile", "email", "groups"]
    grantTypes: ["authorization_code"]
    clientType: "public"

Config is validated at startup — the server exits 1 with validation errors if config is invalid.

browserBaseURL is used only for the human browser redirect to Authelia. tokenBaseURL is used for server-side code exchange. If either is omitted, KeyCape falls back to baseURL.

Endpoints

Endpoint	Description
GET /.well-known/openid-configuration	OIDC discovery document
GET /jwks	RS256 public key in JWK Set format
GET /authorize	Authorization endpoint (PKCE required)
GET /authorize/callback	Authelia callback handler
POST /authorize/callback	privacyIDEA MFA challenge submission
POST /token	Token exchange (authorization_code only)
GET /userinfo	Userinfo endpoint (Bearer token required)
GET /healthz	Health check → {"status":"ok","version":"0.1.0"}

Profile Constraints

KeyCape enforces the NetKingdom IAM Profile. Violations return structured errors:

Error type	Meaning
feature_not_supported_by_profile	Feature is outside the profile entirely
available_in_keycloak_mode_only	Available in expanded mode, not lightweight
rejected_for_profile_safety	Would weaken security guarantees
invalid_profile_usage	Supported feature used incorrectly

Enforced boundaries: no implicit flow, no wildcard redirect URIs, no dynamic client registration, no identity brokering, PKCE S256 required. Profile v0.2 also requires normalized tenant, principal type, groups, roles, scopes, and assurance evidence in tokens consumed by applications and flex-auth.

Migration Tools

KeyCape ships migration tools for the two orthogonal migration dimensions:

IAM migration (KeyCape → Keycloak):

# Export canonical data from LLDAP
./lldap-export --url ldap://lldap:389 --bind-dn cn=admin,... --output canonical-export.yaml

# Transform to Keycloak realm import
./keycape-to-keycloak --input canonical-export.yaml --realm netkingdom --output keycloak-realm-import.json

Directory migration (LLDAP → OpenLDAP / 389DS / AD):

./lldap-to-ldap --input canonical-export.yaml --target openldap --base-dn dc=netkingdom,dc=local --output migration.ldif

Both migrations are independent. Perform either or both without affecting privacyIDEA MFA enrollment.

LDAP Schema Validator

# Validate in CI mode (strict)
./validator --mode ci --input directory-snapshot.yaml

# Validate before provisioning
./validator --mode provisioning --input users.yaml

Validates: DN structure, required attributes, no unknown attributes, user references, no cyclic groups, username uniqueness, email format.

Repo Structure

src/
  cmd/               # Binary entrypoints
    keycape/         # Main server
    validator/       # LDAP schema validator
    lldap-export/    # Migration: LLDAP → canonical
    keycape-to-keycloak/ # Migration: canonical → Keycloak
    lldap-to-ldap/   # Migration: canonical → LDIF
  internal/
    config/          # Config loading and validation
    domain/          # Canonical identity model (Go types)
    errors/          # Profile error taxonomy
    adapters/        # Backend adapters (Authelia, LLDAP, privacyIDEA)
    server/          # OIDC handlers + telemetry + enforcement
    migration/       # Migration logic
    validator/       # LDAP schema validation
  tests/
    profile/         # Scenario A: lightweight baseline
    negative/        # Scenario D: unsupported feature rejection
    migration/       # Scenarios B & C: replacement tests
spec/
  canonical-model.yaml  # Source of truth for all identity data
  ldap-schema.yaml      # Canonical LDAP schema rules
docs/adr/               # Architecture Decision Records
workplans/              # Implementation workplans
wiki/                   # Specifications

Key Documents

• wiki/KeyCapeSpecification_v0.1.md — Architecture, design intent, objectives
• wiki/KeyCapeSpecificationPack_v0.1.md — Normative implementation spec
• docs/adr/ADR-0001-choose-go-for-keycape.md — Language decision (Go vs Rust)

Container Image

The KeyCape image is published to the Gitea OCI registry on CoulombCore.

Registry: 92.205.130.254:32166 Image: 92.205.130.254:32166/coulomb/key-cape

Pull

docker pull 92.205.130.254:32166/coulomb/key-cape:latest

The registry runs over plain HTTP. Configure Docker to allow it:

// /etc/docker/daemon.json
{ "insecure-registries": ["92.205.130.254:32166"] }

Build and push locally

# Build with default tag (latest)
make image

# Build with a specific tag
IMAGE_TAG=dev make image

# Push to registry (requires prior docker login)
docker login 92.205.130.254:32166
make push

# Push with a specific tag
IMAGE_TAG=v1.0.0 make push

Tags

Trigger	Tags
Push to main	latest, main-<short-sha>
Tag v1.2.3	1.2.3, 1.2, 1, latest

CI (Gitea Actions)

The workflow at .gitea/workflows/image.yaml builds and publishes automatically on every push to main and on semver tags (v*).

Required Gitea Actions secrets on the key-cape repo:

Secret	Value
REGISTRY_USER	Gitea username or machine account (e.g. ci-netkingdom)
REGISTRY_TOKEN	Gitea personal access token with write:packages scope

Domain

Part of the NetKingdom domain. Tracked in the Custodian State Hub under domain netkingdom, repo slug key-cape.

See CLAUDE.md for agent session protocol and workplan conventions.