#!/bin/bash # shellcheck source=../scripts/helpers/index.sh source /usr/local/bin/helpers/index.sh KEYSIZE=4096 SELECTOR=mail DOMAINS= function __usage { printf '%s' "${PURPLE}OPEN-DKIM${RED}(${YELLOW}8${RED}) ${ORANGE}NAME${RESET} open-dkim - configure DomainKeys Identified Mail (DKIM) ${ORANGE}SYNOPSIS${RESET} ./setup.sh config dkim [ OPTIONS${RED}...${RESET} ] ${ORANGE}DESCRIPTION${RESET} Configures DKIM keys. OPTIONS can be used to configure a more complex setup. LDAP setups require these options. ${ORANGE}OPTIONS${RESET} ${BLUE}Generic Program Information${RESET} help Print the usage information. ${BLUE}Configuration adjustments${RESET} keysize Set the size of the keys to be generated. Possible are 1024, 2048 and 4096 (default). selector Set a manual selector (default is 'mail') for the key. (${LCYAN}ATTENTION${RESET}: NOT IMPLEMENTED YET!) domain Provide the domain(s) for which keys are to be generated. ${ORANGE}EXAMPLES${RESET} ${LWHITE}./setup.sh config dkim keysize 2048${RESET} Creates keys of length 2048 bit in a default setup where domains are obtained from your accounts. ${LWHITE}./setup.sh config dkim keysize 2048 selector 2021-dkim${RESET} Creates keys of length 2048 bit in a default setup where domains are obtained from your accounts. The DKIM selector used is '2021-dkim'. ${LWHITE}./setup.sh config dkim keysize 2048 selector 2021-dkim domain 'whoami.com,whoareyou.org'${RESET} Appropriate for an LDAP setup. Creates keys of length 2048 bit in a default setup where domains are obtained from your accounts. The DKIM selector used is '2021-dkim'. The domains for which DKIM keys are generated are 'whoami.com' and 'whoareyou.org'. ${ORANGE}EXIT STATUS${RESET} Exit status is 0 if command was successful. If wrong arguments are provided or arguments contain errors, the script will exit early with exit status 2. " } [[ ${1:-} == 'help' ]] && { __usage ; exit 0 ; } while [[ ${#} -gt 0 ]] do case "${1}" in ( 'keysize' ) if [[ -n ${2+set} ]] then KEYSIZE="${2}" shift shift else _exit_with_error "No keysize provided after 'keysize' argument" fi ;; ( 'selector' ) if [[ -n ${2+set} ]] then # shellcheck disable=SC2034 SELECTOR="${2}" shift shift else _exit_with_error "No selector provided after 'selector' argument" fi ;; ( 'domain' ) if [[ -n ${2+set} ]] then DOMAINS="${2}" shift shift else _exit_with_error "No domain(s) provided after 'domain' argument" fi ;; ( * ) __usage _exit_with_error "Unknown options '${1}' ${2:+and \'${2}\'}" ;; esac done DATABASE_VHOST='/tmp/vhost.dkim' # Prepare a file with one domain per line: function _generate_domains_config { local TMP_VHOST='/tmp/vhost.dkim.tmp' # Generate the default vhost (equivalent to /etc/postfix/vhost), # unless CLI arg DOMAINS provided an alternative list to use instead: if [[ -z ${DOMAINS} ]] then _obtain_hostname_and_domainname # uses TMP_VHOST: _vhost_collect_postfix_domains else tr ',' '\n' <<< "${DOMAINS}" >"${TMP_VHOST}" fi # uses DATABASE_VHOST + TMP_VHOST: _create_vhost } _generate_domains_config if [[ ! -s ${DATABASE_VHOST} ]] then _log 'warn' 'No entries found, no keys to make' exit 0 fi while read -r DKIM_DOMAIN do mkdir -p "/tmp/docker-mailserver/opendkim/keys/${DKIM_DOMAIN}" if [[ ! -f "/tmp/docker-mailserver/opendkim/keys/${DKIM_DOMAIN}/${SELECTOR}.private" ]] then _log 'info' "Creating DKIM private key '/tmp/docker-mailserver/opendkim/keys/${DKIM_DOMAIN}/${SELECTOR}.private'" opendkim-genkey \ --bits="${KEYSIZE}" \ --subdomains \ --domain="${DKIM_DOMAIN}" \ --selector="${SELECTOR}" \ --directory="/tmp/docker-mailserver/opendkim/keys/${DKIM_DOMAIN}" fi # write to KeyTable if necessary KEYTABLEENTRY="${SELECTOR}._domainkey.${DKIM_DOMAIN} ${DKIM_DOMAIN}:${SELECTOR}:/etc/opendkim/keys/${DKIM_DOMAIN}/${SELECTOR}.private" if [[ ! -f "/tmp/docker-mailserver/opendkim/KeyTable" ]] then _log 'debug' 'Creating DKIM KeyTable' echo "${KEYTABLEENTRY}" >/tmp/docker-mailserver/opendkim/KeyTable else if ! grep -q "${KEYTABLEENTRY}" "/tmp/docker-mailserver/opendkim/KeyTable" then echo "${KEYTABLEENTRY}" >>/tmp/docker-mailserver/opendkim/KeyTable fi fi # write to SigningTable if necessary SIGNINGTABLEENTRY="*@${DKIM_DOMAIN} ${SELECTOR}._domainkey.${DKIM_DOMAIN}" if [[ ! -f /tmp/docker-mailserver/opendkim/SigningTable ]] then _log 'debug' 'Creating DKIM SigningTable' echo "*@${DKIM_DOMAIN} ${SELECTOR}._domainkey.${DKIM_DOMAIN}" >/tmp/docker-mailserver/opendkim/SigningTable else if ! grep -q "${SIGNINGTABLEENTRY}" /tmp/docker-mailserver/opendkim/SigningTable then echo "${SIGNINGTABLEENTRY}" >>/tmp/docker-mailserver/opendkim/SigningTable fi fi done < <(_get_valid_lines_from_file "${DATABASE_VHOST}") # create TrustedHosts if missing if [[ -d /tmp/docker-mailserver/opendkim ]] && [[ ! -f /tmp/docker-mailserver/opendkim/TrustedHosts ]] then _log 'debug' 'Creating DKIM TrustedHosts' echo "127.0.0.1" >/tmp/docker-mailserver/opendkim/TrustedHosts echo "localhost" >>/tmp/docker-mailserver/opendkim/TrustedHosts fi