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8f8e311110
On default iptables rules are updated to add ACCEPT egress traffic.
If the network egress default policy is false, CS remove ACCEPT and adds the DROP rule which
is egress default rule when there are no other egress rules.
If the CS network egress default policy is true, CS won't configure any default rule for egress because
router already came up to accept egress traffic. If there are already egress rules for network then the
egress rules get applied on VR.
For isolated network with out firewall service, VR default allows egress traffic (guestnetwork --> public network)
188 lines
4.6 KiB
Bash
Executable File
188 lines
4.6 KiB
Bash
Executable File
#!/usr/bin/env bash
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# Licensed to the Apache Software Foundation (ASF) under one
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# or more contributor license agreements. See the NOTICE file
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# distributed with this work for additional information
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# regarding copyright ownership. The ASF licenses this file
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# to you under the Apache License, Version 2.0 (the
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# "License"); you may not use this file except in compliance
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# with the License. You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing,
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# software distributed under the License is distributed on an
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# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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# KIND, either express or implied. See the License for the
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# specific language governing permissions and limitations
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# under the License.
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# $Id: firewallRule_egress.sh 9947 2013-01-17 19:34:24Z manuel $ $HeadURL: svn://svn.lab.vmops.com/repos/vmdev/java/patches/xenserver/root/firewallRule_egress.sh $
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# firewallRule_egress.sh -- allow some ports / protocols from vm instances
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# @VERSION@
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source /root/func.sh
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lock="biglock"
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locked=$(getLockFile $lock)
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if [ "$locked" != "1" ]
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then
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exit 1
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fi
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#set -x
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usage() {
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printf "Usage: %s: -a protocol:startport:endport:sourcecidrs> \n" $(basename $0) >&2
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printf "sourcecidrs format: cidr1-cidr2-cidr3-...\n"
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}
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fw_egress_remove_backup() {
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sudo iptables -D FW_OUTBOUND -j _FW_EGRESS_RULES
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sudo iptables -F _FW_EGRESS_RULES
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sudo iptables -X _FW_EGRESS_RULES
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}
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fw_egress_save() {
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sudo iptables -E FW_EGRESS_RULES _FW_EGRESS_RULES
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}
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fw_egress_chain () {
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#supress errors 2>/dev/null
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fw_egress_remove_backup
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fw_egress_save
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sudo iptables -N FW_EGRESS_RULES
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sudo iptables -A FW_OUTBOUND -j FW_EGRESS_RULES
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}
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fw_egress_backup_restore() {
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sudo iptables -A FW_OUTBOUND -j FW_EGRESS_RULES
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sudo iptables -E _FW_EGRESS_RULES FW_EGRESS_RULES
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fw_egress_remove_backup
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}
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fw_entry_for_egress() {
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local rule=$1
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local prot=$(echo $rule | cut -d: -f2)
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local sport=$(echo $rule | cut -d: -f3)
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local eport=$(echo $rule | cut -d: -f4)
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local cidrs=$(echo $rule | cut -d: -f5 | sed 's/-/ /g')
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if [ "$sport" == "0" -a "$eport" == "0" ]
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then
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DPORT=""
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else
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DPORT="--dport $sport:$eport"
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fi
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logger -t cloud "$(basename $0): enter apply fw egress rules for guest $prot:$sport:$eport:$cidrs"
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for lcidr in $cidrs
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do
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[ "$prot" == "reverted" ] && continue;
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if [ "$prot" == "icmp" ]
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then
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typecode="$sport/$eport"
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[ "$eport" == "-1" ] && typecode="$sport"
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[ "$sport" == "-1" ] && typecode="any"
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sudo iptables -A FW_EGRESS_RULES -p $prot -s $lcidr --icmp-type $typecode \
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-j $target
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result=$?
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elif [ "$prot" == "all" ]
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then
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sudo iptables -A FW_EGRESS_RULES -p $prot -s $lcidr -j $target
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result=$?
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else
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sudo iptables -A FW_EGRESS_RULES -p $prot -s $lcidr $DPORT -j $target
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result=$?
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fi
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[ $result -gt 0 ] &&
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logger -t cloud "Error adding iptables entry for guest network $prot:$sport:$eport:$cidrs" &&
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break
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done
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logger -t cloud "$(basename $0): exit apply egress firewall rules for guest network"
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return $result
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}
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aflag=0
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rules=""
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rules_list=""
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ip=""
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dev=""
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pflag=0
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shift
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shift
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while getopts 'a:P:' OPTION
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do
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case $OPTION in
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a) aflag=1
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rules="$OPTARG"
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;;
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P) pflag=1
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pvalue="$OPTARG"
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;;
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?) usage
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unlock_exit 2 $lock $locked
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;;
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esac
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done
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if [ "$aflag" != "1" ]
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then
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usage
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unlock_exit 2 $lock $locked
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fi
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if [ -n "$rules" ]
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then
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rules_list=$(echo $rules | cut -d, -f1- --output-delimiter=" ")
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fi
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# rule format
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# protocal:sport:eport:cidr
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#-a tcp:80:80:0.0.0.0/0::tcp:220:220:0.0.0.0/0:,tcp:222:222:192.168.10.0/24-75.57.23.0/22-88.100.33.1/32
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# if any entry is reverted , entry will be in the format reverted:0:0:0
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# example : tcp:80:80:0.0.0.0/0:, tcp:220:220:0.0.0.0/0:,200.1.1.2:reverted:0:0:0
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success=0
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if [ "$pvalue" == "1" -o "$pvalue" == "2" ]
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then
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target="DROP"
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else
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target="ACCEPT"
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fi
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fw_egress_chain
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for r in $rules_list
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do
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fw_entry_for_egress $r
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success=$?
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if [ $success -gt 0 ]
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then
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logger -t cloud "failure to apply fw egress rules "
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break
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else
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logger -t cloud "successful in applying fw egress rules"
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fi
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done
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if [ $success -gt 0 ]
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then
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logger -t cloud "restoring from backup for guest network"
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fw_egress_backup_restore
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else
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logger -t cloud "deleting backup for guest network"
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if [ "$pvalue" == "1" ]
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then
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#Adding default policy rule
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sudo iptables -A FW_EGRESS_RULES -j ACCEPT
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fi
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fi
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fw_egress_remove_backup
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unlock_exit $success $lock $locked
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