apiVersion: v1
kind: ConfigMap
metadata:
  name: knoe-kdc-config
data:
  krb5.conf: |
    [libdefaults]
      default_realm = PROLE.LOCAL
      dns_lookup_realm = false
      dns_lookup_kdc = false

    [realms]
      PROLE.LOCAL = {
        kdc = 127.0.0.1
        admin_server = 127.0.0.1
      }
      PROLE.ORG = {
        kdc = myrddin.prole.org
        admin_server = myrddin.prole.org
      }

    [capaths]
      PROLE.LOCAL = {
        PROLE.ORG = .
      }
      PROLE.ORG = {
        PROLE.LOCAL = .
      }
  kdc.conf: |
    [kdcdefaults]
      kdc_ports = 88
      kdc_tcp_ports = 88
    [realms]
      PROLE.LOCAL = {
        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@PROLE.LOCAL *
  entrypoint.sh: |
    #!/usr/bin/env bash
    set -euo pipefail
    export DEBIAN_FRONTEND=noninteractive

    realm="${PROLE_KDC_REALM:-PROLE.ORG}"
    admin_principal="${PROLE_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
      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 "${PROLE_KDC_MASTER_PASSWORD:-}" ]]; then
      echo "ERROR: Missing required env PROLE_KDC_MASTER_PASSWORD (secret 'knoe-kdc-secrets/master_password')." >&2
      exit 1
    fi
    if [[ -z "${PROLE_KDC_ADMIN_PASSWORD:-}" ]]; then
      echo "ERROR: Missing required env PROLE_KDC_ADMIN_PASSWORD (secret 'knoe-kdc-secrets/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 "${PROLE_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 ${PROLE_KDC_ADMIN_PASSWORD} ${admin_principal}"
    fi

    # admin user principal for UI login (uses master password)
    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 ${PROLE_KDC_MASTER_PASSWORD} admin@${realm}"
    fi

    # guest user principal (read-only)
    if ! kadmin.local -q "get_principal guest@${realm}" >/dev/null 2>&1; then
      echo "Creating guest user principal guest@${realm}..."
      kadmin.local -q "addprinc -pw ${PROLE_KDC_GUEST_PASSWORD:-changeme} guest@${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. Check /var/log/ (syslog) for details." >&2
      exit 1
    fi
    exec kadmind -nofork