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Syncthing - add script to open inbound ports on installation
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unman
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307
syncthing/in.sh
Executable file
307
syncthing/in.sh
Executable file
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#!/usr/bin/bash
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get_help(){
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cat <<HERE
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Allow remote access to a named qube.
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Syntax: in.sh [-h | [ a|p ]] {add|delete} target {tcp|udp} {port number|service} [external port]
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options:
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h Print this help
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a Auto mode
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p Permanent rules
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Specify target qube, action, tcp or udp, and target port, separated by spaces.
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The target port can be given by port number or by name (e.g ssh).
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The action should be "add" or "delete".
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For example:
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in add target_qube tcp 80
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in add target_qube tcp ssh
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in delete target_qube tcp https
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By default, the script will open a port on the final netvm which is the same as the target port.
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It is possible to specify an alternative port:
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in add target_qube tcp ssh 80
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In auto mode a port will be opened on the FIRST external interface.
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In permanent mode changes to the firewall will be written in each qube to take effect on qube start up.
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DO NOT use this script for qubes behind a Tor or VPN proxy.
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At a minimum you risk breaking the security of those proxies.
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HERE
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exit
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}
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# Check input port
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check_port(){
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if ! [ "$2" -eq "$2" >& /dev/null ];then
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status=1
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else
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if [ $2 -lt 65536 ]; then
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status=0
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portnum=$2
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else
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status=1
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fi
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fi
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if [ $status -ne 0 ]; then
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if ! grep -q -w ^$2\ /etc/services ; then
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echo "Specify usable port number or service name"
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exit
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else
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portnum=$( getent services $2 |awk '{split($2,a,"/");print a[1]}')
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if [ $? -ne 0 ]; then
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echo "Specify usable port number or service name"
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exit
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fi
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fi
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fi
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echo $portnum
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}
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get_handle(){
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local my_handle=$( qvm-run -q -u root -p $1 " nft -a list table $2|awk 'BEGIN{c=0} /$3/{c++; if (c==$4) print \$NF}' " )
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echo $my_handle
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}
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#Tunnel through netvms
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tunnel(){
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declare -a my_netvms=("${!1}")
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declare -a my_ips=("${!2}")
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declare -i numhops
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numhops=${#my_ips[@]}
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lasthop=$((numhops-1))
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local i=1
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iface="eth0"
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qvm-run -q -u root ${my_netvms[$lasthop]} " nft list table nat|grep ' $proto dport $portnum dnat to ${my_ips[$numhops-1]}'"
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if [ $? -eq 0 ]; then
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echo "Are rules already set?"
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exit
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fi
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while [ $i -ne $numhops ]
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do
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if [ $i -eq 1 ]; then
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portnum_used=$external_portnum
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portnum_target=$portnum
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else
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portnum_used=$external_portnum
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portnum_target=$external_portnum
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fi
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echo "${my_netvms[$i]} $portnum_used"
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if [ $i -eq $lasthop ]; then
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iface=$external_iface
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fi
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# Is it nft or iptables?
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local found=$( qvm-run -p -q -u root ${my_netvms[$i]} -- nft list table nat 2>/dev/null )
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if [[ x$found == 'x' ]]; then
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qvm-run -q -u root ${my_netvms[$i]} -- "iptables -I QBS-FORWARD -i $iface -p $proto --dport $portnum_target -d ${my_ips[$i-1]} -j ACCEPT"
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qvm-run -q -u root ${my_netvms[$i]} -- "iptables -t nat -I PR-QBS-SERVICES -i $iface -p $proto --dport $portnum_used -j DNAT --to-destination ${my_ips[$i-1]}:$portnum_target"
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if [ $permanent -eq 1 ]; then
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qvm-run -q -u root ${my_netvms[$i]} -- "echo iptables -I QBS-FORWARD -i $iface -p $proto --dport $portnum_target -d ${my_ips[$i-1]} -j ACCEPT >> /rw/config/rc.local"
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qvm-run -q -u root ${my_netvms[$i]} -- "echo iptables -t nat -I PR-QBS-SERVICES -i $iface -p $proto --dport $portnum_used -j DNAT --to-destination ${my_ips[$i-1]}:$portnum_target >> /rw/config/rc.local"
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fi
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else
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qvm-run -q -u root ${my_netvms[$i]} -- nft insert rule nat PR-QBS-SERVICES meta iifname $iface $proto dport $portnum_used dnat to ${my_ips[$i-1]}:$portnum_target
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qvm-run -q -u root ${my_netvms[$i]} -- nft insert rule filter QBS-FORWARD meta iifname $iface ip daddr ${my_ips[$i-1]} $proto dport $portnum_target ct state new accept
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if [ $permanent -eq 1 ]; then
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qvm-run -q -u root ${my_netvms[$i]} -- "echo nft insert rule nat PR-QBS-SERVICES meta iifname $iface $proto dport $portnum_used dnat to ${my_ips[$i-1]}:$portnum_target >> /rw/config/rc.local"
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qvm-run -q -u root ${my_netvms[$i]} -- "echo nft insert rule filter QBS-FORWARD meta iifname $iface ip daddr ${my_ips[$i-1]} $proto dport $portnum_target ct state new accept >> /rw/config/rc.local"
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fi
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fi
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((i++))
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done
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}
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#Teardown - from top netvm down
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teardown(){
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declare -a my_netvms=("${!1}")
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declare -a my_ips=("${!2}")
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declare -i numhops
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numhops=${#my_ips[@]}
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numhops=$((numhops-1))
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local i=$numhops
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iface="eth0"
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echo "Removing firewall rules"
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while [ $i -gt 0 ]
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do
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if [ $i -eq 1 ]; then
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portnum_used=$external_portnum
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portnum_target=$portnum
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else
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portnum_used=$external_portnum
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portnum_target=$external_portnum
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fi
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# Is it nft or iptables?
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echo "${my_netvms[$i]}"
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local found=$( qvm-run -p -q -u root ${my_netvms[$i]} -- "nft list table nat 2>/dev/null" )
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if [[ x$found == 'x' ]]; then
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qvm-run -q -u root ${my_netvms[$i]} -- "iptables -D QBS-FORWARD -i $iface -p $proto --dport $portnum_target -d ${my_ips[$i-1]} -j ACCEPT"
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qvm-run -q -u root ${my_netvms[$i]} -- "iptables -t nat -D PR-QBS-SERVICES -i $iface -p $proto --dport $external_portnum -j DNAT --to-destination ${my_ips[$i-1]}:$portnum_target"
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if [ $permanent -eq 1 ]; then
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qvm-run -q -u root ${my_netvms[$i]} -- "sed -i '/iptables -D QBS-FORWARD -i $iface -p $proto --dport $portnum_target -d ${my_ips[$i-1]} -j ACCEPT/d' /rw/config/rc.local"
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qvm-run -q -u root ${my_netvms[$i]} -- "sed -i '/iptables -t nat -D PR-QBS-SERVICES -i $iface -p $proto --dport $external_portnum -j DNAT --to-destination ${my_ips[$i-1]}:$portnum_target/d' /rw/config/rc.local"
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fi
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else
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local handle=$( get_handle ${my_netvms[$i]} nat "dport $external_portnum " 1 )
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qvm-run -q -u root ${my_netvms[$i]} -- "nft delete rule nat PR-QBS-SERVICES handle $handle"
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local handle=$( get_handle ${my_netvms[$i]} filter "dport $external_portnum " 1 )
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qvm-run -q -u root ${my_netvms[$i]} -- "nft delete rule filter QBS-FORWARD handle $handle"
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if [ $permanent -eq 1 ]; then
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qvm-run -q -u root ${my_netvms[$i]} -- "sed -i '/nft insert rule nat PR-QBS-SERVICES meta iifname $iface $proto dport $portnum_used dnat to ${my_ips[$i-1]}:$portnum_target/d' /rw/config/rc.local"
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qvm-run -q -u root ${my_netvms[$i]} -- "sed -i '/nft insert rule filter QBS-FORWARD meta iifname $iface ip daddr ${my_ips[$i-1]} $proto dport $portnum_target ct state new accept/d' /rw/config/rc.local"
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fi
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fi
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((i--))
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done
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local found=$( qvm-run -p -q -u root ${my_netvms[$i]} -- nft list table nat 2>/dev/null )
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if [[ x$found == 'x' ]]; then
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qvm-run -q -u root ${my_netvms[$i]} " iptables -D INPUT -p $proto --dport $external_portnum -j ACCEPT"
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else
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handle=$( get_handle ${my_netvms[$i]} filter "dport $portnum " 1 )
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qvm-run -q -u root ${my_netvms[$i]} -- nft delete rule filter INPUT handle $handle
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fi
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exit
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}
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list(){
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return
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}
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## Defaults
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auto=0
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permanent=0
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## Get options
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optstring=":hap"
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while getopts ${optstring} option ; do
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case $option in
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h)
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get_help
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exit ;;
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a)
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auto=1 ;;
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p)
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permanent=1 ;;
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?)
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get_help ;;
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esac
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done
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shift $((OPTIND -1))
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## Check inputs
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if [ $# -lt 4 ]; then
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get_help
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fi
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qvm-check -q $2 2>/dev/null
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if [ "$?" -ne 0 ];then
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echo "$2 is not the name of any qube"
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exit
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else
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qube_name=$2
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fi
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if [ "$3" != "tcp" -a "$3" != "udp" ]; then
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echo "Specify tcp or udp"
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exit
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else
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proto=$3
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fi
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portnum=$(check_port $3 $4)
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if [ $# -eq 5 ]; then
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external_portnum=$(check_port $3 $5)
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else
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external_portnum=$portnum
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fi
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# Get all netvms
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declare -a netvms
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declare -a ips
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declare -a external_ips
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hop=0
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netvms[$hop]=$qube_name
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IFS='|' read -r netvms[$hop+1] ips[$hop] <<< $(qvm-ls $qube_name --raw-data -O netvm,IP)
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while [ ${netvms[hop+1]} != "-" ]
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do
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((hop++))
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IFS='|' read -r netvms[$hop+1] ips[$hop] <<< $(qvm-ls ${netvms[$hop]} --raw-data -O netvm,IP)
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done
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if [ $1 == "delete" ]; then
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teardown netvms[@] ips[@]
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elif [ $1 == "add" ]; then
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if [ $hop -eq 0 ]; then
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echo "$qube_name is not network connected"
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echo "Cannot set up a tunnel"
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exit
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fi
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# Check last hop has external IP address
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readarray -t external_ips < <( qvm-run -p ${netvms[$hop]} "ip -4 -o a|grep -wv 'lo\|vif[0-9]*.*'"|awk '{print $2,$4}')
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#readarray -t external_ips < <( qvm-run -p ${netvms[$hop]} "ip -4 -o a|grep -wv 'vif[0-9]'"|awk '{print $2,$4}')
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num_ifs=${#external_ips[@]}
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if [ $num_ifs -eq 1 ]; then
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interface=0
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elif [ $auto -eq 1 ]; then
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interface=0
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elif [ $num_ifs -gt 1 ]; then
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echo "${netvms[$hop]} has more than 1 external interface"
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echo "Which one do you want to use?"
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for i in $(seq $num_ifs)
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do
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echo "$i. ${external_ips[$i-1]}"
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done
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read interface
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if ! [ "$interface" -eq "$interface" ] 2> /dev/null; then
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echo "No such interface"
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exit
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elif [ $interface -gt $num_ifs ] || [ $interface -lt 1 ]; then
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echo "No such interface"
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exit
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fi
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((interface--))
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else
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echo "${netvms[$hop]} does not have an external interface"
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echo "Cannot set up a tunnel"
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exit
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fi
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external_ip=${external_ips[$interface]}
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external_iface="${external_ip%[[:space:]]*}"
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ip="${external_ip#*[0-9]}"
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ip="${ip%%/*}"
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ips[$hop]=$ip
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# Create tunnel
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found=$( qvm-run -p -q -u root $qube_name -- nft list table nat 2>/dev/null )
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if [[ x$found == 'x' ]]; then
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found=$(qvm-run -p -u root $qube_name "iptables -L -nv |grep -c '.*ACCEPT.*$proto dpt:$portnum' ")
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if [ "$found" -gt 0 ]; then
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echo "Input rule in $qube_name already exists"
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echo "Please check configuration - exiting now."
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exit
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else
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qvm-run -q -u root $qube_name "iptables -I INPUT -p $proto --dport $portnum -j ACCEPT "
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fi
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else
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qvm-run -q -u root $qube_name "nft list table filter|grep '$proto dport $portnum accept' "
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if [ $? -eq 0 ]; then
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echo "Input rule in $qube_name already exists"
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echo "Please check configuration - exiting now."
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exit
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else
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handle=$( get_handle $qube_name filter related,established 1)
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qvm-run -q -u root $qube_name -- nft add rule filter INPUT position $handle iifname eth0 $proto dport $portnum accept
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fi
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fi
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tunnel netvms[@] ips[@]
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if [ $? -ne 0 ]; then
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teardown netvms[@] ips[@]
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fi
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else
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get_help
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fi
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