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bind/bind_create_dkim_delegation.sh

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#!/usr/bin/env bash
# - Adds DKIM subdomain delegation for a given domain
# -
# - Return (Exit) Codes:
# - success:
# - 0: DKIM subdomain delegation already exists
# - 1: DKIM subdomain delegation added
# - error:
# - 11: No zonefile found
# - 15: Hostname/Domain not supported
# - 16: Determin Nameservers failed
# - 21: Adding Record failed
# - 99: Fatal error
# -
# - Example:
# - bind_create_dkim_delegation.sh oopen.de
script_name="$(basename $(realpath $0))"
working_dir="$(dirname $(realpath $0))"
conf_file="${working_dir}/conf/bind.conf"
log_file="$(mktemp)"
backup_date="$(date +%Y-%m-%d-%H%M)"
# ----------
# Setting Defaults
# ----------
DEFAULT_CONF_FILE_DIR="/etc/bind"
DEFAULT_BIND_USER="bind"
DEFAULT_BIND_GROUP="bind"
# **********
# Don't make changes after this
# **********
# ----------
# Base Function(s)
# ----------
usage() {
[[ -n "$1" ]] && error "$1"
[[ $verbose ]] && echo -e "
\033[1mUsage:\033[m
$(basename $0) [Options] <dkim-domain> | check
\033[1mDescription\033[m
Scripts add a nameserver delegation for zone _domainkey.<dkim-domain>. The nameserver
for the new zone are the same as for the domain itself.
\033[1mReturn (Exit) Codes\033[m
success:
0: DKIM subdomain delegation already exists
1: DKIM subdomain delegation added
error:
11: No zonefile found
15: Hostname/Domain not supported
16: Determin Nameservers failed
21: Adding Record failed
99: Fatal error
\033[1mOptions\033[m
-h
Prints this help.
-q
Runs in silent mode.
\033[1mFiles\033[m
$conf_file: Configuration file
\033[1mExample:\033[m
Create DKIM delegation for domain oopen.de.
\033[1m$(basename $0) oopen.de\033[m
This results in NS Records like:
_domainkey.oopen.de. IN NS name-server-1
_domainkey.oopen.de. IN NS name-server-2
"
clean_up 1
}
clean_up() {
# Perform program exit housekeeping
rm $log_file
blank_line
exit $1
}
echononl(){
if $verbose ; then
echo X\\c > /tmp/shprompt$$
if [ `wc -c /tmp/shprompt$$ | awk '{print $1}'` -eq 1 ]; then
echo -e -n " $*\\c" 1>&2
else
echo -e -n " $*" 1>&2
fi
rm /tmp/shprompt$$
fi
}
warn (){
if $verbose ; then
echo ""
echo -e " [ \033[33m\033[1mWarning\033[m ]: $*"
echo ""
fi
}
info (){
if $verbose ; then
echo ""
echo -e " [ \033[32m\033[1mInfo\033[m ]: $*"
echo ""
fi
}
error(){
if $verbose ; then
echo ""
echo -e " [ \033[31m\033[1mFehler\033[m ]: $*"
echo ""
fi
}
echo_ok() {
if $verbose ; then
echo -e "\033[75G[ \033[32mok\033[m ]"
fi
}
echo_failed(){
if $verbose ; then
echo -e "\033[75G[ \033[1;31mfailed\033[m ]"
fi
}
echo_skipped() {
if $verbose ; then
echo -e "\033[75G[ \033[33m\033[1mskipped\033[m ]"
fi
}
backup_dir () {
dir_to_backup=$1
echononl "Backup existing directory \"$dir_to_backup\" .."
if [[ -d "$dir_to_backup" ]] ; then
cp -a "$dir_to_backup" "${dir_to_backup}.$backup_date" > $log_file 2>&1
if [[ $? -eq 0 ]]; then
echo_ok
else
echo_failed
error "Backup directory \"$dir_to_backup\" failed!"
clean_up 99
fi
else
echo_failed
error "Directory \"$dir_to_backup\" not found. No Backup written!"
clean_up 99
fi
}
blank_line() {
if $verbose ; then
echo ""
fi
}
trim() {
local var="$*"
var="${var#"${var%%[![:space:]]*}"}" # remove leading whitespace characters
var="${var%"${var##*[![:space:]]}"}" # remove trailing whitespace characters
echo -n "$var"
}
# ----------
# - Jobhandling
# ----------
# - Run 'clean_up' for signals SIGHUP SIGINT SIGTERM
# -
trap clean_up SIGHUP SIGINT SIGTERM
# ----------
# - Some checks ..
# ----------
# - Running in a terminal?
# -
if [[ -t 1 ]] ; then
verbose=true
else
verbose=false
fi
# -Is systemd supported on this system?
# -
systemd_supported=false
systemd=$(which systemd)
systemctl=$(which systemctl)
if [[ -n "$systemd" ]] && [[ -n "$systemctl" ]] ; then
systemd_supported=true
fi
# - Print help?
# -
if [[ "$(trim $*)" = " -h" ]] || [[ "$(trim $*)" = " --help" ]] ; then
usage
fi
if [[ -z "$(which basename)" ]]; then
fatal 'It seems "basename" is not installed, but needed!'
fi
if [[ -z "$(which realpath)" ]]; then
fatal 'It seems "realpath" is not installed, but needed!'
fi
# ==========
# - Begin Main Script
# ==========
# ----------
# - Headline
# ----------
if $terminal ; then
echo ""
echo -e "\033[1m----------\033[m"
echo -e "\033[32m\033[1mRunning script \033[m\033[1m$script_name\033[32m .. \033[m"
echo -e "\033[1m----------\033[m"
fi
# ----------
# - Read commandline parameter
# ----------
while getopts bh opt ; do
case $opt in
q) verbose=true
;;
h) usage
;;
\?) usage
;;
*) ;;
esac
done
#shift $(expr $OPTIND - 1)
#[[ $# -eq "1" ]] || usage "Wrong number of arguments!"
if [[ "$1" = "check" ]]; then
info "Script \033[1m$(basename $0)\033[m was successfully invoked, but its only a test."
clean_up 0
fi
dkim_domain="$1"
# ----------
# Read Configurations from $conf_file
# ----------
blank_line
echononl "Loading default Configuration values from $(basename ${conf_file}).."
if [[ ! -f "$conf_file" ]]; then
echo_skipped
else
source "${conf_file}" > $log_file 2>&1
if [[ $? -eq 0 ]]; then
echo_ok
else
echo_failed
fatal "$(cat $log_file)"
fi
fi
[[ -n "$CONF_FILE_DIR" ]] || CONF_FILE_DIR="$DEFAULT_CONF_FILE_DIR"
[[ -n "$ZONES_DECLARATION_FILE" ]] || ZONES_DECLARATION_FILE="${CONF_FILE_DIR}/named.conf.local"
[[ -n "$BIND_USER" ]] || BIND_USER="$DEFAULT_BIND_USER"
[[ -n "$BIND_GROUP" ]] || BIND_GROUP="$DEFAULT_BIND_GROUP"
# - Determin zone (domain)
# -
blank_line
echononl "Determine zone for '$dkim_domain'"
_failed=false
_hostname=$dkim_domain
_tmp_hostname=$(echo ${_hostname//\./\\.})
while ! grep -e "$_tmp_hostname" $ZONES_DECLARATION_FILE > /dev/null 2>&1 ; do
_hostname=${_hostname#*.}
_tmp_hostname=$(echo ${_hostname//\./\\.})
if [[ ! $_tmp_hostname =~ \. ]]; then
_failed=true
break
fi
done
if $_failed ; then
echo_failed
error "Given hostname/domain \"$dkim_domain\" not supported by this nameserver!"
exit 15
else
echo_ok
domain=$_hostname
fi
# - Determine zonefile (by reading bind configuration)
# -
echononl "Determine zonefile (by reading bind configuration)"
_found=false
declare -i _number=0
regex_zone="^[[:space:]]*zone[[:space:]]+\"$domain\""
regex_file="^[[:space:]]*file"
while IFS='' read -r line || [[ -n "$line" ]] ; do
if [[ $line =~ $regex_zone ]]; then
_found=true
fi
if $_found ; then
if [[ $line =~ $regex_file ]]; then
zone_file=`echo $line | awk '{print$2}'`
shopt -s extglob
if [[ $zone_file =~ \; ]]; then
zone_file=${zone_file%%*(\;)}
fi
if [[ $zone_file =~ ^\" ]]; then
zone_file=${zone_file##*(\")}
zone_file=${zone_file%%*(\")}
fi
shopt -u extglob
let number++
break
fi
fi
done < $ZONES_DECLARATION_FILE
if [[ $number -eq 0 ]] ; then
echo_failed
error "No Zonefile (master) found for domain \"$dkim_domain\" ."
clean_up 11
else
echo_ok
zone_file_dir="$(dirname $zone_file)"
fi
# - Check if subdomain delegation already exists
# -
record_name="_domainkey.$dkim_domain"
record_type="NS"
if grep -E "^(${record_name}\..+$record_type|_domainkey\s+.+$record_type)" $zone_file > /dev/null 2>&1 ; then
info "Subdomain delegation for $record_name already exists!"
clean_up 0
fi
# - We will place the new NS Record after the last existing one.
# -
# - first we will count the number ox existing NS records
# -
declare -i _count
search_string="^[^;].+\s+IN\s+NS"
_count=$(grep -Eo "$search_string" $zone_file | wc -l)
if [[ $_count -eq 0 ]]; then
error "No existing NS record found. Check and add subdomain delegation manually!"
clean_up 99
fi
# - Get DNS server
# -
echononl "Get Namservers for domain '$domain'"
dns_servers="$(grep -E "^\s*(@|)\s+IN\s+NS" $zone_file 2>/dev/null | sed 's/@//' | sed 's/\.$//' | awk '{print$3}')"
if [[ -n "$dns_servers" ]]; then
echo_ok
else
echo_failed
error "Determin DNS servers for domain '$domain' failed!"
clean_up 16
fi
# - This is needed, because the dns servers are requested above, in
# - an IFS='' environment!
# -
declare -i i=0
for _dns_server in $dns_servers ; do
dns_server_arr+=("$_dns_server")
done
# - Backup zone directory
# -
blank_line
backup_dir $zone_file_dir
blank_line
# - Add subdomain delegation
# -
CUR_IFS=$IFS
IFS=''
_tmpfile=`mktemp`
> $_tmpfile
echononl "Add Subdomain delegation for DKIM TXT Records .."
while read -r line || [[ -n "$line" ]]; do
echo $line >> $_tmpfile
if echo "$line" | grep -E "$search_string" > /dev/null 2>&1 ; then
let _count--
fi
if [[ $_count -eq 0 ]]; then
echo "" >> $_tmpfile
echo "; Subdomain delegation DKIM keys for ${dkim_domain}" >> $_tmpfile
declare -i _number=0
while [[ $_number -lt ${#dns_server_arr[@]} ]] ; do
echo -e "_domainkey.${dkim_domain}. IN NS ${dns_server_arr[${_number}]}." >> $_tmpfile
((_number++))
done
echo "" >> $_tmpfile
_count=-1
fi
done < "$zone_file"
if [[ $? -eq 0 ]] ; then
echo_ok
else
echo_failed
rm $_tmpfile
exit 21
fi
IFS=$CUR_IFS
mv $_tmpfile $zone_file
# - Set Correct Owner/Permission
# -
blank_line
echononl "Correct Owner for $zone_file .."
chown $BIND_USER:$BIND_GROUP $zone_file
if [[ $? -eq 0 ]] ; then
echo_ok
else
echo_failed
error "Setting ownership for '$zone_file' failed!"
clean_up 99
fi
echononl "Correct permissions on $zone_file .."
chmod 644 $zone_file
if [[ $? -eq 0 ]] ; then
echo_ok
else
echo_failed
error "Correct permissions on '$zone_file' failed!"
clean_up 99
fi
_return_value=1
# - Remove backup of zonefile directory if no changes are made
# -
if [[ -d "${zone_file_dir}.$backup_date" ]] ; then
diff -Nur "$zone_file_dir" "${zone_file_dir}.$backup_date" > /dev/null 2>&1
if [[ $? -eq 0 ]]; then
info "No zone file has changed.\n Removing previously created backup."
echononl "Delete '${zone_file_dir}.$backup_date'.."
rm -rf "${zone_file_dir}.$backup_date" > $log_file 2>&1
if [[ $? -eq 0 ]]; then
echo_ok
else
echo_failed
fi
fi
fi
warn "Serial was not incremented and zone not reloaded.\n Use script \033[1mbind_set_new_serial.sh\033[m to do that."
blank_line
clean_up $_return_value
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