Let's Encrypt auto renew script

letsencrypt-auto-renew

#/bin/sh

OPTS=$(getopt -o cehw: --long config:,expire-limit:,help,webservice: -n "$0" -- "$@")
if [ $? != 0 ]; then
  echo "Terminating ..." >&2
  exit 1
fi

CONFIG=/etc/letsencrypt/cli.ini
WEBSERVICE=nginx
EXPIRE_LIMIT=7
EXPIRE=
DOMAIN=
CERT_FILE=
CERT_LIVE_PATH=/etc/letsencrypt/live
VALID_DAY=0

OPENSSL=$(which openssl)

if [ -z "$OPENSSL" ]; then
  echo "OpenSSL is required, please install" >&2
  exit 1
fi

print_help () {
  echo "Usage: $0 [Options]"
  echo "Options:"
  echo " -c, --config <config_file>  Configuration file"
  echo "                             default: /etc/letsencrypt/cli.ini"
  echo " -e, --expire-limit <day>    Expire limit in day to perform the renewal"
  echo "                             default: 7"
  echo " -w, --webservice <name>     Web service name"
  echo "                             default: nginx"
  echo " -h, --help                  Print this help"
  exit 0
}

print_settings () {
  printf "Start: %s\n" "$(date)"
  printf "Settings ...\n" "$(date)"
  printf " - Config File : %s\n" "$CONFIG"
  printf " - Domain: %s\n" "$DOMAIN"
  printf " - Certificate File: %s\n" "$CERT_FILE"
  printf " - Certificate Valid For: %d %s\n" $VALID_DAY $(test $VALID_DAY -gt 1 && echo days || echo day)
  printf " - Web Service : %s\n" "$WEBSERVICE"
  printf " - Expire Limit: %d %s\n" $EXPIRE_LIMIT $(test $EXPIRE_LIMIT -gt 1 && echo days || echo day) 
}

parse_config () {
  DOMAIN=$(grep "^\s*domains" $CONFIG | sed 's/,/ /g' | sed 's/^\s*domains\s*=\s*\(.*\)$/\1/')

  if [ -z "$DOMAIN" ]; then
    echo "No domains specified in $CONFIG" >&2
    exit 1
  fi

  get_certfile
  get_expire
}

get_certfile () {
  for domain in $DOMAIN; do
    if [ -f $CERT_LIVE_PATH/$domain/fullchain.pem ]; then
      CERT_FILE=$CERT_LIVE_PATH/$domain/fullchain.pem
      break
    fi
  done

  if [ -z "$CERT_FILE" ]; then
    echo "No valid certificate files for domain $DOMAIN" >&2
    exit 1
  fi
}

get_expire () {
  EXPIRE=$(date -d"$($OPENSSL x509 -in $CERT_FILE -noout -enddate | cut -d= -f2)" +%s)
  VALID_DAY=$((($EXPIRE - $(date +%s)) / 86400))
}

start () {
  if [ $VALID_DAY -lt $EXPIRE_LIMIT ]; then
    renew
  else
    echo "The certificate for $DOMAIN is up to date"
  fi
}

renew () {
  /opt/letsencrypt/letsencrypt-auto -c $CONFIG -a webroot --agree-tos --renew-by-default certonly
  systemctl reload ${WEBSERVICE}.service
  get_expire
  echo "The certificate for $DOMAIN is valid for next $VALID_DAY days"
}

eval set -- "$OPTS"

while true; do
  case "$1" in
    -c | --config)
      CONFIG="$2"; shift 2
      if [ ! -f "$CONFIG" ]; then
        printf "Config file "%s" does not exist ...\n" $CONFIG >&2
        exit 1
      fi

      parse_config
      ;;
    -e | --expire-limit)
      EXPIRE_LIMIT=$2; shift 2
      ;;
    -w | --webservice)
      WEBSERVICE="$2"; shift 2
      ;;
    -h | --help)
      print_help
      ;;
    *)
      break
      ;;
  esac
done

test -z "$CONFIG" && print_help || print_settings

start
exit 0

rahunas.com.ini

domains = rahunas.com, www.rahunas.com                                                                                                      
webroot-path = /path/to/www.rahunas.com/
email = [email protected]

setup-daily-cron

#!/bin/sh
SCRIPT_NAME=letsencrypt-daily-check
SCRIPT_PATH=/usr/local/sbin/$SCRIPT_NAME

cat << EOF > $SCRIPT_PATH
#!/bin/sh
/usr/local/sbin/letsencrypt-auto-renew --config /etc/letsencrypt/rahunas.com.ini >> /var/log/letsencrypt/rahunas.com.log 2>&1 &
EOF
chmod +x $SCRIPT_PATH
mkdir -p /var/log/letsencrypt
ln -sf $SCRIPT_PATH /etc/cron.daily/$SCRIPT_NAME