Initial commit
Benjamin Renard commited on 2014-01-13 16:42:54
Showing 3 changed files, with 354 additions and 0 deletions.
- .gitignore 0000000..b25c15b
- README 0000000..0770088
- cisco-acl-to-iptables 0000000..dc27556
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+*~ |
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+Convert Cisco ACLs to iptables commands |
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+======================================= |
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+ |
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+This script permit to convert Cisco ACLs to ipbtales commands. This script take as input |
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+the result of "show run" command from Cisco firewall, detect line starting by "access-list " |
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+and convert them to iptables command. |
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+ |
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+You can add iptables arguments by using [add to iptables command] parameter. |
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+ |
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+To debug, use [-d] parameter that will display how this script as parse and understand the |
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+ACL line. |
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+ |
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+Usage |
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+----- |
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+ |
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+ cisco-acl-to-iptables [rule file] [add to iptables command] [-d] |
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+ |
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+Copyright |
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+--------- |
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+ |
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+Copyright (c) 2013 Benjamin Renard |
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+ |
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+License |
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+------- |
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+ |
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+This program is free software; you can redistribute it and/or |
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+modify it under the terms of the GNU General Public License version 2 |
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+as published by the Free Software Foundation. |
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+ |
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+This program is distributed in the hope that it will be useful, |
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+but WITHOUT ANY WARRANTY; without even the implied warranty of |
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+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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+GNU General Public License for more details. |
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+ |
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+You should have received a copy of the GNU General Public License |
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+along with this program; if not, write to the Free Software |
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+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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+#!/bin/bash |
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+ |
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+DEBUG=0 |
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+ADD_COMMENT=1 |
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+PERMIT='ACCEPT' |
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+DENY='DROP' |
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+ |
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+IN=$1 |
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+[ ! -f "$IN" ] && echo "Usage : $0 [rule file] [add to iptables command] [-d]" && exit 1 |
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+ |
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+ADD_TO_IPTABLES_CMD=$2 |
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+ |
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+[ "$2" == "-d" -o "$3" == "-d" ] && DEBUG=1 |
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+ |
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+function get_word() {
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+ echo "$1"|awk "{print \$$2}"
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+} |
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+ |
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+function is_valid_ip() {
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+ ip="$1" |
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+ if [ "$( echo "$ip"| egrep -c '^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$' )" == "1" ]
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+ then |
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+ for i in $( seq 1 4 ) |
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+ do |
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+ O=$( echo "$ip"|cut -d '.' -f $i ) |
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+ [ $O -lt 0 -o $O -gt 254 ] && echo $i && return $i |
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+ done |
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+ echo 0 |
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+ return 0 |
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+ fi |
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+ echo 1 |
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+ return 1 |
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+} |
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+ |
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+function convert_mask() {
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+ mask="$1" |
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+ if [ "$( echo "$mask"| egrep -c '^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$' )" == "1" ]
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+ then |
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+ NETMASK="" |
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+ for i in $( seq 1 4 ) |
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+ do |
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+ O=$( echo "$mask"|cut -d '.' -f $i ) |
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+ [ $O -lt 0 -o $O -gt 255 ] && echo "" && return $i |
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+ let o=255-O |
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+ NETMASK="$NETMASK.$o" |
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+ done |
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+ echo $NETMASK|sed 's/^\.//' |
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+ return 0 |
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+ fi |
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+ echo "" |
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+ return 1 |
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+} |
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+ |
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+function convert_netmask_to_cidr() {
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+ mask="$1" |
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+ if [ "$( echo "$mask"| egrep -c '^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$' )" == "1" ]
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+ then |
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+ CIDR=0 |
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+ for i in $( seq 1 4 ) |
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+ do |
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+ O=$( echo "$mask"|cut -d '.' -f $i ) |
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+ if [ "$O" == "0" ] |
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+ then |
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+ continue |
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+ elif [ "$O" == "128" ] |
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+ then |
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+ let CIDR=CIDR+1 |
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+ elif [ "$O" == "192" ] |
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+ then |
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+ let CIDR=CIDR+2 |
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+ elif [ "$O" == "224" ] |
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+ then |
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+ let CIDR=CIDR+3 |
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+ elif [ "$O" == "240" ] |
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+ then |
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+ let CIDR=CIDR+4 |
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+ elif [ "$O" == "248" ] |
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+ then |
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+ let CIDR=CIDR+5 |
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+ elif [ "$O" == "252" ] |
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+ then |
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+ let CIDR=CIDR+6 |
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+ elif [ "$O" == "254" ] |
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+ then |
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+ let CIDR=CIDR+7 |
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+ elif [ "$O" == "255" ] |
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+ then |
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+ let CIDR=CIDR+8 |
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+ else |
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+ echo "" |
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+ return $i |
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+ fi |
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+ done |
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+ echo $CIDR |
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+ return 0 |
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+ fi |
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+ echo "" |
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+ return 1 |
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+} |
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+ |
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+function convert_ip_mask_to_arg() {
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+ IP="$1" |
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+ MASK="$2" |
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+ CIDR="$( convert_netmask_to_cidr "$MASK" )" |
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+ if [ "$CIDR" == "" ] |
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+ then |
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+ echo "Error converting netmask $MASK to CIDR (Result : $CIDR | Code : $?). Stop." > /dev/stderr |
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+ echo "" |
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+ return 1 |
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+ elif [ "$CIDR" == "32" ] |
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+ then |
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+ echo "$IP" |
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+ elif [ "$CIDR" == "0" -a "$IP" == "0.0.0.0" ] |
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+ then |
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+ echo "0/0" |
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+ else |
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+ echo "$IP/$CIDR" |
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+ fi |
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+} |
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+ |
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+function print_acl_details() {
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+ echo "ACL : $line |
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+Action : $ACL_ACTION |
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+Protocole : $ACL_PROTO |
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+Groupe : $ACL_GROUP |
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+Source : $ACL_SRC_NET/$ACL_SRC_MASK |
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+Source services : '$ACL_SRC_PORTS' |
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+Destination : $ACL_DST_NET/$ACL_DST_MASK |
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+Destination services : '$ACL_DST_PORTS'" |
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+} |
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+ |
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+function convert_2_iptables_cmd() {
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+ MULTIPORTS=0 |
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+ CMD="iptables -I FORWARD" |
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+ [ "$ACL_PROTO" != 'ip' ] && CMD="$CMD $ADD_TO_IPTABLES_CMD -p $ACL_PROTO" |
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+ |
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+ SRC="$( convert_ip_mask_to_arg "$ACL_SRC_NET" "$ACL_SRC_MASK" )" |
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+ [ "$SRC" == "" ] && echo "ERROR : Fail to convert source" > /dev/stderr && return 1 |
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+ [ "$SRC" != "0/0" ] && CMD="$CMD -s $SRC" |
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+ |
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+ if [ "$ACL_SRC_PORTS" != "any" ] |
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+ then |
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+ if [ $( echo "$ACL_SRC_PORTS"|sed 's/ /\n/'|wc -l ) -gt 1 ] |
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+ then |
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+ MULTIPORTS=1 |
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+ PORTS="" |
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+ for p in $ACL_SRC_PORTS |
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+ do |
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+ PORTS=",$PORTS" |
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+ done |
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+ CMD="$CMD -m multiport --sports $( echo "$PORTS"|sed 's/^,//' )" |
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+ else |
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+ CMD="$CMD --sport $ACL_SRC_PORTS" |
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+ fi |
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+ fi |
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+ |
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+ DST="$( convert_ip_mask_to_arg "$ACL_DST_NET" "$ACL_DST_MASK" )" |
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+ [ "$DST" == "" ] && echo "ERROR : Fail to convert destination" > /dev/stderr && return 1 |
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+ [ "$DST" != "0/0" ] && CMD="$CMD -d $DST" |
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+ |
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+ if [ "$ACL_DST_PORTS" != "any" ] |
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+ then |
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+ if [ $( echo "$ACL_DST_PORTS"|sed 's/ /\n/'|wc -l ) -gt 1 ] |
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+ then |
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+ PORTS="" |
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+ for p in $ACL_DST_PORTS |
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+ do |
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+ PORTS=",$PORTS" |
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+ done |
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+ [ $MULTIPORTS -eq 0 ] && CMD="$CMD -m multiport" |
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+ CMD="$CMD --dports $( echo "$PORTS"|sed 's/^,//' )" |
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+ else |
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+ CMD="$CMD --dport $ACL_DST_PORTS" |
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+ fi |
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+ fi |
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+ |
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+ if [ "$ACL_ACTION" == "permit" ] |
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+ then |
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+ CMD="$CMD -j $PERMIT" |
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+ elif [ "$ACL_ACTION" == "deny" ] |
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+ then |
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+ CMD="$CMD -j $DENY" |
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+ else |
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+ echo "ERROR : Action '$ACL_ACTION' not recognized" > /dev/stderr |
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+ return 1 |
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+ fi |
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+ |
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+ echo $CMD |
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+} |
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+ |
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+IFS=" |
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+" |
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+for line in $( cat "$IN"|egrep "^access-list " ) |
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+do |
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+ # Reset |
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+ word="" |
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+ ACL_ACTION="" |
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+ ACL_PROTO="" |
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+ ACL_GROUP="" |
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+ ACL_SRC_NET="" |
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+ ACL_SRC_MASK="" |
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+ ACL_SRC_PORTS="" |
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+ ACL_DST_NET="" |
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+ ACL_DST_MASK="" |
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+ ACL_DST_PORTS="" |
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+ |
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+ field=2 |
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+ ACL_GROUP="$( get_word "$line" $field )" |
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+ |
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+ field=3 |
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+ ACL_ACTION="$( get_word "$line" $field )" |
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+ if [ "$ACL_ACTION" != "permit" -a "$ACL_ACTION" != "deny" ] |
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+ then |
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+ echo "ERROR : Action not recognized in $( print_acl_details )" |
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+ continue |
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+ fi |
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+ |
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+ field=4 |
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+ ACL_PROTO="$( get_word "$line" $field )" |
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+ |
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+ field=5 |
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+ ACL_SRC_NET="$( get_word "$line" $field )" |
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+ |
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+ if [ "$ACL_SRC_NET" == "any" ] |
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+ then |
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+ ACL_SRC_NET="0.0.0.0" |
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+ ACL_SRC_MASK="0.0.0.0" |
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+ elif [ "$ACL_SRC_NET" == "host" ] |
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+ then |
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+ let field=field+1 |
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+ ACL_SRC_NET="$( get_word "$line" $field )" |
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+ [ $( is_valid_ip "$ACL_SRC_NET" ) -ne 0 ] && echo "ERROR : Source host IP address not recognized in $( print_acl_details )" && continue |
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+ ACL_SRC_MASK="255.255.255.255" |
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+ elif [ "$( is_valid_ip "$ACL_SRC_NET" )" == "0" ] |
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+ then |
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+ let field=field+1 |
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+ ACL_SRC_MASK="$( get_word "$line" $field )" |
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+ ACL_SRC_MASK=$( convert_mask "$ACL_SRC_MASK" ) |
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+ [ "$ACL_SRC_MASK" == "" ] && echo "ERROR : Source mask not recognized in $( print_acl_details )" && continue |
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+ else |
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+ echo "ERROR : Source net not recognized in ACL, pass : $line" |
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+ continue |
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+ fi |
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+ |
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+ let field=field+1 |
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+ word="$( get_word "$line" $field )" |
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+ if [ "$word" == "eq" ] |
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+ then |
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+ ACL_SRC_PORTS="" |
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+ while [ true ] |
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+ do |
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+ let field=field+1 |
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+ word="$( get_word "$line" $field )" |
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+ [ "$word" == "" -o "$word" == "host" -o "$word" == "any" -o "$( is_valid_ip "$word" )" == "0" ] && break |
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+ ACL_SRC_PORTS="$ACL_SRC_PORTS $word" |
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+ done |
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+ if [ "$ACL_SRC_PORTS" == " " ] |
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+ then |
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+ ACL_SRC_PORTS="any" |
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+ else |
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+ ACL_SRC_PORTS=$( echo "$ACL_SRC_PORTS"|sed 's/^ //' ) |
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+ fi |
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+ else |
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+ ACL_SRC_PORTS="any" |
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+ fi |
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+ |
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+ if [ "$word" == "any" ] |
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+ then |
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+ ACL_DST_NET="0.0.0.0" |
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+ ACL_DST_MASK="0.0.0.0" |
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+ elif [ "$word" == "host" ] |
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+ then |
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+ let field=field+1 |
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+ ACL_DST_NET="$( get_word "$line" $field )" |
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+ [ $( is_valid_ip "$ACL_DST_NET" ) -ne 0 ] && echo "ERROR : Destination host IP address not recognized in $( print_acl_details )" && continue |
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+ ACL_DST_MASK="255.255.255.255" |
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+ elif [ "$( is_valid_ip "$word" )" == "0" ] |
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+ then |
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+ ACL_DST_NET="$word" |
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+ let field=field+1 |
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+ ACL_DST_MASK="$( get_word "$line" $field )" |
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+ if [ "$ACL_DST_MASK" == "" ] |
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+ then |
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+ ACL_DST_MASK="255.255.255.255" |
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+ else |
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+ ACL_DST_MASK=$( convert_mask "$ACL_DST_MASK" ) |
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+ [ "$ACL_DST_MASK" == "" ] && echo "ERROR : Destination mask not recognized in $( print_acl_details )" && continue |
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+ fi |
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+ fi |
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+ |
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+ let field=field+1 |
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+ word="$( get_word "$line" $field )" |
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+ if [ "$word" == "" ] |
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+ then |
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+ ACL_DST_PORTS="any" |
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+ elif [ "$word" == "eq" ] |
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+ then |
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+ ACL_DST_PORTS="" |
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+ while [ true ] |
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+ do |
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+ let field=field+1 |
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+ word="$( get_word "$line" $field )" |
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+ [ "$word" == "" ] && break |
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+ ACL_DST_PORTS="$ACL_DST_PORTS $word" |
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+ done |
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+ ACL_DST_PORTS=$( echo "$ACL_DST_PORTS"|sed 's/^ //' ) |
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+ else |
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+ echo "ERROR : Destination port(s) specification not recognized (word = $word) in $( print_acl_details )" |
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+ continue |
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+ fi |
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+ |
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+ [ $DEBUG -eq 1 ] && print_acl_details |
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+ [ $ADD_COMMENT -eq 1 ] && echo "# ACL : $line" |
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+ convert_2_iptables_cmd |
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+ echo |
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+done |
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| 0 | 317 |