apiVersion: v1
kind: ConfigMap
metadata:
  name: knoe-kdc-config
  namespace: knoe-system
data:
  krb5.conf: |
    [libdefaults]
      default_realm = KNOE.DEV
      dns_lookup_realm = false
      dns_lookup_kdc = false
      ticket_lifetime = 10h
      renew_lifetime = 7d
      forwardable = true

    [realms]
      KNOE.DEV = {
        kdc = 127.0.0.1
        admin_server = 127.0.0.1
      }

    [domain_realm]
      .knoe.dev = KNOE.DEV
      knoe.dev  = KNOE.DEV

  kdc.conf: |
    [kdcdefaults]
      kdc_ports = 88
      kdc_tcp_ports = 88
    [realms]
      KNOE.DEV = {
        database_name = /var/lib/krb5kdc/principal
        admin_keytab = FILE:/etc/krb5kdc/kadm5.keytab
        acl_file = /etc/krb5kdc/kadm5.acl
        key_stash_file = /etc/krb5kdc/stash
        max_life = 10h 0m 0s
        max_renewable_life = 7d 0h 0m 0s
        default_principal_flags = +preauth
      }

  kadm5.acl: |
    admin/admin@KNOE.DEV *

  entrypoint.sh: |
    #!/usr/bin/env bash
    set -euo pipefail
    export DEBIAN_FRONTEND=noninteractive

    realm="${KNOE_KDC_REALM:-KNOE.DEV}"
    admin_principal="${KNOE_KDC_ADMIN_PRINCIPAL:-admin/admin}"
    if [[ "${admin_principal}" != *"@"* ]]; then
      admin_principal="${admin_principal}@${realm}"
    fi

    if ! command -v krb5kdc >/dev/null 2>&1; then
      echo "Installing Kerberos packages..."
      echo "krb5-config krb5-config/default_realm string ${realm}" | debconf-set-selections || true
      echo "krb5-config krb5-config/kerberos_servers string 127.0.0.1" | debconf-set-selections || true
      echo "krb5-config krb5-config/admin_server string 127.0.0.1" | debconf-set-selections || true
      apt-get update -qq
      apt-get install -y --no-install-recommends krb5-kdc krb5-admin-server krb5-user dnsutils ca-certificates
      rm -rf /var/lib/apt/lists/*
    fi

    mkdir -p /etc/krb5kdc /var/lib/krb5kdc
    if [[ -f /opt/knoe-kdc/krb5.conf ]]; then
      cp /opt/knoe-kdc/krb5.conf /etc/krb5.conf
    fi
    if [[ -f /opt/knoe-kdc/kdc.conf ]]; then
      cp /opt/knoe-kdc/kdc.conf /etc/krb5kdc/kdc.conf
    fi
    if [[ -f /opt/knoe-kdc/kadm5.acl ]]; then
      cp /opt/knoe-kdc/kadm5.acl /etc/krb5kdc/kadm5.acl
    fi

    if [[ -z "${KNOE_KDC_MASTER_PASSWORD:-}" ]]; then
      echo "ERROR: Missing required env KNOE_KDC_MASTER_PASSWORD" >&2
      exit 1
    fi
    if [[ -z "${KNOE_KDC_ADMIN_PASSWORD:-}" ]]; then
      echo "ERROR: Missing required env KNOE_KDC_ADMIN_PASSWORD" >&2
      exit 1
    fi

    if [[ ! -f /var/lib/krb5kdc/principal ]]; then
      echo "Initializing realm database for ${realm}..."
      kdb5_util create -s -r "${realm}" -P "${KNOE_KDC_MASTER_PASSWORD}"
    fi

    if ! kadmin.local -q "get_principal ${admin_principal}" >/dev/null 2>&1; then
      echo "Creating admin principal ${admin_principal}..."
      kadmin.local -q "addprinc -pw ${KNOE_KDC_ADMIN_PASSWORD} ${admin_principal}"
    fi

    # system admin user principal
    if ! kadmin.local -q "get_principal admin@${realm}" >/dev/null 2>&1; then
      echo "Creating admin user principal admin@${realm}..."
      kadmin.local -q "addprinc -pw ${KNOE_KDC_MASTER_PASSWORD} admin@${realm}"
    fi

    echo "Starting krb5kdc and kadmind ..."
    krb5kdc -n &
    sleep 0.5
    if ! pgrep -x krb5kdc >/dev/null 2>&1; then
      echo "ERROR: krb5kdc failed to start." >&2
      exit 1
    fi
    exec kadmind -nofork