docker-mailserver/target/bin/restrict-access

#!/bin/bash

# shellcheck source=../scripts/helpers/index.sh
source /usr/local/bin/helpers/index.sh

MODE="${1}"
USER="${3}"

function __usage { echo "Usage: ${0} <add|del|list> <send|receive> [<email@domain.com>]" ; }

[[ -z ${MODE} ]] && _exit_with_error 'Missing parameters: <add|del|list> <send|receive> [<email@domain.com>]'

case "${2}" in
  ( 'send' )
    DATABASE="/tmp/docker-mailserver/postfix-send-access.cf"
    ;;

  ( 'receive' )
    DATABASE="/tmp/docker-mailserver/postfix-receive-access.cf"
    ;;

  ( * )
    __usage
    _exit_with_error "Missing parameters: specify 'send' or 'receive'"
    ;;

esac

if [[ -z ${USER} ]] && [[ ${MODE} != list ]]
then
  read -r -p 'User(user@domain.com): ' USER
  echo
  [[ -z ${USER} ]] && _exit_with_error 'User must not be empty'
fi

case "${MODE}" in
  ( 'add' )
    grep -qi "^$(_escape "${USER}")" "${DATABASE}" 2>/dev/null && _exit_with_error "User '${USER}' already denied to ${2} mails"

    if [[ ! -f ${DATABASE} ]]
    then
      # shellcheck disable=SC2015
      [[ ${DATABASE} = *"send"* ]] && \
          sed -i 's|smtpd_sender_restrictions =|smtpd_sender_restrictions = check_sender_access texthash:/tmp/docker-mailserver/postfix-send-access.cf,|' /etc/postfix/main.cf \
        || sed -i 's|smtpd_recipient_restrictions =|smtpd_recipient_restrictions = check_recipient_access texthash:/tmp/docker-mailserver/postfix-receive-access.cf,|' /etc/postfix/main.cf

      _reload_postfix
    fi

    echo -e "${USER} \t\t REJECT" >>"${DATABASE}"
    ;;

  ( 'del' )
    sed -ie "/^$(_escape "${USER}")/d" "${DATABASE}" 2>/dev/null || _exit_with_error "User '${USER}' not found."
    ;;

  ( 'list' )
    grep "REJECT" "${DATABASE}" 2>/dev/null || _log 'info' "Everyone is allowed to ${2} mails"
    ;;

  ( * )
    __usage
    _exit_with_error "Missing mode: specify 'add', 'del' or 'list'"
    ;;

esac