#!/bin/bash

# When initializing step-ca with the docker flag
# DOCKER_STEPCA_INIT_PASSWORD_FILE the password will be used both for key
# encryption as well as the admin "step" provisioner. If not using that flag a
# separate password will be generated for each usage. This seems better as you
# are not typing the encryption password any other time, while the provisioner
# password is used anytime you are managing things.
#
# This script is used on first setup of step-ca to modify the provisioner to
# use its own password instead. Pending
# https://github.com/smallstep/cli/pull/1294 you need to supply the new
# password by hand, see below for the commented out command.

# If we detect that the key-password is still valid for the provisioner change it.
if step ca admin list --admin-subject=step --admin-provisioner=admin --admin-password-file=/opt/step-ca/init/secrets/key-password > /dev/null 2>&1; then
  echo "admin provisioner still using encryption key password, changing it"

  # Change the provisioner password
  # https://smallstep.com/docs/step-ca/provisioners/#changing-a-jwk-provisioner-password
  OLD_ENCRYPTED_KEY=$(step ca provisioner list | jq -r '.[] | select(.name == "admin").encryptedKey')

  # Unfortunately not possible to supply --password-file to "crypto jwe encrypt" yet, pending https://github.com/smallstep/cli/pull/1294
  #ENCRYPTED_KEY=$(echo $OLD_ENCRYPTED_KEY | step crypto jwe decrypt --password-file /opt/step-ca/init/secrets/key-password | step crypto jwe encrypt --alg PBES2-HS256+A128KW --password-file /opt/step-ca/init/secrets/provisioner-password | step crypto jose format)
  ENCRYPTED_KEY=$(echo "$OLD_ENCRYPTED_KEY" | step crypto jwe decrypt --password-file /opt/step-ca/init/secrets/key-password | step crypto jwe encrypt --alg PBES2-HS256+A128KW | step crypto jose format)

  step ca provisioner update admin --private-key=<(echo -n "$ENCRYPTED_KEY") --admin-subject=step --admin-provisioner=admin --admin-password-file=/opt/step-ca/init/secrets/key-password

  # Now verify that we can use the expected password for the admin provisioner
  if ! step ca admin list --admin-subject=step --admin-provisioner=admin --admin-password-file=/opt/step-ca/init/secrets/provisioner-password > /dev/null 2>&1; then
    echo "tried updating provisioner password but it does not work!"
    exit 1
  fi
else
  echo "admin provisioner not using encryption key password, doing nothing"
fi