#!/bin/sh

 # Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
 # or more contributor license agreements. Licensed under the "Elastic License
 # 2.0", the "GNU Affero General Public License v3.0 only", and the "Server Side
 # Public License v 1"; you may not use this file except in compliance with, at
 # your election, the "Elastic License 2.0", the "GNU Affero General Public
 # License v3.0 only", or the "Server Side Public License, v 1".

set -e

krb5kdc
kadmind

if [[ $# -lt 1 ]]; then
  echo 'Usage: addprinc.sh principalName [password]'
  echo '  principalName    user principal name without realm'
  echo '  password         If provided then will set password for user else it will provision user with keytab'
  exit 1
fi

PRINC="$1"
PASSWD="$2"
USER=$(echo $PRINC | tr "/" "_")

VDIR=/fixture
RESOURCES=$VDIR
PROV_DIR=$RESOURCES/provision
ENVPROP_FILE=$RESOURCES/env.properties
BUILD_DIR=$VDIR/build
CONF_DIR=$BUILD_DIR/conf
KEYTAB_DIR=$BUILD_DIR/keytabs
LOCALSTATEDIR=/etc
LOGDIR=/var/log/krb5

mkdir -p $KEYTAB_DIR

REALM=$(cat $ENVPROP_FILE | grep realm= | head -n 1 | cut -d '=' -f 2)

ADMIN_PRIN=admin/admin@$REALM
ADMIN_KTAB=$LOCALSTATEDIR/admin.keytab

USER_PRIN=$PRINC@$REALM
USER_KTAB=$LOCALSTATEDIR/$USER.keytab

if [ -f $USER_KTAB ] && [ -z "$PASSWD" ]; then
  echo "Principal '${PRINC}@${REALM}' already exists. Re-copying keytab..."
  cp $USER_KTAB $KEYTAB_DIR/$USER.keytab
else
  if [ -z "$PASSWD" ]; then
    echo "Provisioning '${PRINC}@${REALM}' principal and keytab..."
    kadmin -p $ADMIN_PRIN -kt $ADMIN_KTAB -q "addprinc -randkey $USER_PRIN"
    kadmin -p $ADMIN_PRIN -kt $ADMIN_KTAB -q "ktadd -k $USER_KTAB $USER_PRIN"
    cp $USER_KTAB $KEYTAB_DIR/$USER.keytab
  else
    echo "Provisioning '${PRINC}@${REALM}' principal with password..."
    kadmin -p $ADMIN_PRIN -kt $ADMIN_KTAB -q "addprinc -pw $PASSWD $PRINC"
  fi
fi

echo "Copying conf to local"
# make the configuration available externally
cp -v $LOCALSTATEDIR/krb5.conf $BUILD_DIR/krb5.conf.template
# We are running as root in the container, allow non root users running the container to be able to clean these up
chmod -R 777 $BUILD_DIR