secure the provision and activation routes with a token

fixes #751

scripts/cloudron-setup

@@ -47,8 +47,9 @@ apiServerOrigin="https://api.cloudron.io"
 webServerOrigin="https://cloudron.io"
 sourceTarballUrl=""
 rebootServer="true"
+setupToken=""
 
-args=$(getopt -o "" -l "help,skip-baseimage-init,provider:,version:,env:,skip-reboot" -n "$0" -- "$@")
+args=$(getopt -o "" -l "help,skip-baseimage-init,provider:,version:,env:,skip-reboot,generate-setup-token" -n "$0" -- "$@")
 eval set -- "${args}"
 
 while true; do
@@ -67,6 +68,7 @@ while true; do
         shift 2;;
     --skip-baseimage-init) initBaseImage="false"; shift;;
     --skip-reboot) rebootServer="false"; shift;;
+    --generate-setup-token) setupToken="$(openssl rand -hex 10)"; shift;;
     --) break;;
     *) echo "Unknown option $1"; exit 1;;
     esac
@@ -157,6 +159,7 @@ fi
 echo "=> Installing version ${version} (this takes some time) ..."
 mkdir -p /etc/cloudron
 echo "${provider}" > /etc/cloudron/PROVIDER
+[[ ! -z "${setupToken}" ]] && echo "${setupToken}" > /etc/cloudron/SETUP_TOKEN
 
 if ! /bin/bash "${box_src_tmp_dir}/scripts/installer.sh" &>> "${LOG_FILE}"; then
     echo "Failed to install cloudron. See ${LOG_FILE} for details"
@@ -178,7 +181,12 @@ done
 if ! ip=$(curl -s --fail --connect-timeout 2 --max-time 2 https://api.cloudron.io/api/v1/helper/public_ip | sed -n -e 's/.*"ip": "\(.*\)"/\1/p'); then
     ip='<IP>'
 fi
-echo -e "\n\n${GREEN}After reboot, visit https://${ip} and accept the self-signed certificate to finish setup.${DONE}\n"
+if [[ -z "${setupToken}" ]]; then
+    url="https://${ip}"
+else
+    url="https://${ip}/?setupToken=${setupToken}"
+fi
+echo -e "\n\n${GREEN}After reboot, visit ${url} and accept the self-signed certificate to finish setup.${DONE}\n"
 
 if [[ "${rebootServer}" == "true" ]]; then
     systemctl stop box mysql # sometimes mysql ends up having corrupt privilege tables