OpenVPN LDAP Plugin doesn't run in asynchronous mode about openvpn-auth-ldap HOT 3 OPEN

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script-security 3
auth-user-pass-verify /etc/openvpn/ldap_auth.sh via-env
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#!/bin/bash

ourname=ldap_auth.sh
facility=auth

output=$(mktemp)
error=$(mktemp)

# child process - try simple shell backgrounding
(
  ldapsearch -h auth.local -D "cn=${username},<BASEDN>" -b "<BINDDN>" -s base "objectClass=*" 1.1 -w "${password}"  1>"${output}" 2>"${error}"

  # save exist status here, otherwise the following assignment resets $?
  status=$?

  if [ $status -ne 0 ]; then
    logger -p "${facility}.err" -t "${ourname}" "There was an error authenticating user ${username} against AD."
    logger -p "${facility}.err" -t "${ourname}" "The error was: $(tr '\n' ' ' < "${error}" )"  # turn multiline into single line
    echo "0" > "${auth_control_file}"
    exit 1
  fi

  # look for the "numEntries" line in the output of ldapsearch
  numentries=$(awk '/numEntries:/{ne = $3} END{print ne + 0}' "$output")

  if [ $numentries -eq 1 ]; then
    logger -p "${facility}.info" -t "{$ourname}" "User ${username} authenticated successfully"
    echo "1" > "${auth_control_file}"
    exit 0
  else
    logger -p "${facility}.err" -t "${ourname}" "User ${username} NOT authenticated (user not in group?)"
    echo "0" > "${auth_control_file}"
    exit 1
  fi
) &

# tell openvpn that auth will be deferred
exit 2