384 lines
17 KiB
Bash
Executable File
384 lines
17 KiB
Bash
Executable File
#!/bin/bash
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#
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# .---. . .
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# | | |
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# |--- .--. .-. .-. .-.| .-. .--.--. |.-. .-. .--. .-.
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# | | (.-' (.-' ( | ( )| | | | )( )| | (.-'
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# ' ' --' --' -' - -' ' ' -' -' -' ' - --'
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#
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# Freedom in the Cloud
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#
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# Firewall functions
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#
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# TODO: in future investigate using nftables
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#
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# License
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# =======
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#
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# Copyright (C) 2014-2016 Bob Mottram <bob@freedombone.net>
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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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 Affero General Public License for more details.
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#
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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FIREWALL_CONFIG=$HOME/${PROJECT_NAME}-firewall.cfg
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FIREWALL_DOMAINS=$HOME/${PROJECT_NAME}-firewall-domains.cfg
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function save_firewall_settings {
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iptables-save > /etc/firewall.conf
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ip6tables-save > /etc/firewall6.conf
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printf '#!/bin/sh\n' > /etc/network/if-up.d/iptables
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printf 'iptables-restore < /etc/firewall.conf\n' >> /etc/network/if-up.d/iptables
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printf 'ip6tables-restore < /etc/firewall6.conf\n' >> /etc/network/if-up.d/iptables
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if [ -f /etc/network/if-up.d/iptables ]; then
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chmod +x /etc/network/if-up.d/iptables
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fi
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}
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function global_rate_limit {
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if ! grep -q "tcp_challenge_ack_limit" /etc/sysctl.conf; then
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echo 'net.ipv4.tcp_challenge_ack_limit = 999999999' >> /etc/sysctl.conf
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else
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sed -i 's|net.ipv4.tcp_challenge_ack_limit.*|net.ipv4.tcp_challenge_ack_limit = 999999999|g' /etc/sysctl.conf
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fi
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sysctl -p -q
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}
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function enable_ipv6 {
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# endure that ipv6 is enabled and can route
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sed -i 's/net.ipv6.conf.all.disable_ipv6.*/net.ipv6.conf.all.disable_ipv6 = 0/g' /etc/sysctl.conf
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#sed -i "s/net.ipv6.conf.all.accept_redirects.*/net.ipv6.conf.all.accept_redirects = 1/g" /etc/sysctl.conf
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#sed -i "s/net.ipv6.conf.all.accept_source_route.*/net.ipv6.conf.all.accept_source_route = 1/g" /etc/sysctl.conf
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sed -i "s/net.ipv6.conf.all.forwarding.*/net.ipv6.conf.all.forwarding=1/g" /etc/sysctl.conf
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echo 1 > /proc/sys/net/ipv6/conf/all/forwarding
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}
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function configure_firewall {
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if [ $INSTALLING_MESH ]; then
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mesh_firewall
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return
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fi
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if grep -q "RELATED" /etc/firewall.conf; then
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# recreate the firewall to remove RELATED
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sed -i "/firewall/d" $COMPLETION_FILE
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fi
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if [[ $(is_completed $FUNCNAME) == "1" ]]; then
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return
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fi
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if [[ $INSTALLED_WITHIN_DOCKER == "yes" ]]; then
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# docker does its own firewalling
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return
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fi
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iptables -P INPUT ACCEPT
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ip6tables -P INPUT ACCEPT
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iptables -F
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ip6tables -F
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iptables -t nat -F
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ip6tables -t nat -F
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iptables -X
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ip6tables -X
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iptables -P INPUT DROP
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ip6tables -P INPUT DROP
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iptables -P FORWARD DROP
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ip6tables -P FORWARD DROP
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iptables -A INPUT -i lo -j ACCEPT
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iptables -A INPUT -m conntrack --ctstate ESTABLISHED -j ACCEPT
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# Make sure incoming tcp connections are SYN packets
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iptables -A INPUT -p tcp ! --syn -m state --state NEW -j DROP
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# Drop packets with incoming fragments
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iptables -A INPUT -f -j DROP
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# Drop bogons
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iptables -A INPUT -p tcp --tcp-flags ALL ALL -j DROP
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iptables -A INPUT -p tcp --tcp-flags ALL FIN,PSH,URG -j DROP
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iptables -A INPUT -p tcp --tcp-flags ALL SYN,RST,ACK,FIN,URG -j DROP
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# Incoming malformed NULL packets:
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iptables -A INPUT -p tcp --tcp-flags ALL NONE -j DROP
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mark_completed $FUNCNAME
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}
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function configure_firewall_ping {
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if [[ $(is_completed $FUNCNAME) == "1" ]]; then
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return
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fi
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# Only allow ping for mesh installs
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if [[ $SYSTEM_TYPE != "mesh"* ]]; then
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return
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fi
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iptables -A INPUT -p icmp --icmp-type echo-request -j ACCEPT
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iptables -A OUTPUT -p icmp --icmp-type echo-reply -j ACCEPT
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function_check save_firewall_settings
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save_firewall_settings
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mark_completed $FUNCNAME
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}
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function configure_internet_protocol {
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if [[ $(is_completed $FUNCNAME) == "1" ]]; then
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return
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fi
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if [[ $SYSTEM_TYPE == "mesh"* ]]; then
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return
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fi
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sed -i "s/#net.ipv4.tcp_syncookies.*/net.ipv4.tcp_syncookies=1/g" /etc/sysctl.conf
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sed -i "s/#net.ipv4.conf.all.accept_redirects.*/net.ipv4.conf.all.accept_redirects = 0/g" /etc/sysctl.conf
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sed -i "s/#net.ipv6.conf.all.accept_redirects.*/net.ipv6.conf.all.accept_redirects = 0/g" /etc/sysctl.conf
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sed -i "s/#net.ipv4.conf.all.send_redirects.*/net.ipv4.conf.all.send_redirects = 0/g" /etc/sysctl.conf
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sed -i "s/#net.ipv4.conf.all.accept_source_route.*/net.ipv4.conf.all.accept_source_route = 0/g" /etc/sysctl.conf
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sed -i "s/#net.ipv6.conf.all.accept_source_route.*/net.ipv6.conf.all.accept_source_route = 0/g" /etc/sysctl.conf
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sed -i "s/#net.ipv4.conf.default.rp_filter.*/net.ipv4.conf.default.rp_filter=1/g" /etc/sysctl.conf
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sed -i "s/#net.ipv4.conf.all.rp_filter.*/net.ipv4.conf.all.rp_filter=1/g" /etc/sysctl.conf
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sed -i "s/#net.ipv4.ip_forward.*/net.ipv4.ip_forward=0/g" /etc/sysctl.conf
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sed -i "s/#net.ipv6.conf.all.forwarding.*/net.ipv6.conf.all.forwarding=0/g" /etc/sysctl.conf
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sed -i "s/# net.ipv4.tcp_syncookies.*/net.ipv4.tcp_syncookies=1/g" /etc/sysctl.conf
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sed -i "s/# net.ipv4.conf.all.accept_redirects.*/net.ipv4.conf.all.accept_redirects = 0/g" /etc/sysctl.conf
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sed -i "s/# net.ipv6.conf.all.accept_redirects.*/net.ipv6.conf.all.accept_redirects = 0/g" /etc/sysctl.conf
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sed -i "s/# net.ipv4.conf.all.send_redirects.*/net.ipv4.conf.all.send_redirects = 0/g" /etc/sysctl.conf
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sed -i "s/# net.ipv4.conf.all.accept_source_route.*/net.ipv4.conf.all.accept_source_route = 0/g" /etc/sysctl.conf
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sed -i "s/# net.ipv6.conf.all.accept_source_route.*/net.ipv6.conf.all.accept_source_route = 0/g" /etc/sysctl.conf
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sed -i "s/# net.ipv4.conf.default.rp_filter.*/net.ipv4.conf.default.rp_filter=1/g" /etc/sysctl.conf
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sed -i "s/# net.ipv4.conf.all.rp_filter.*/net.ipv4.conf.all.rp_filter=1/g" /etc/sysctl.conf
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sed -i "s/# net.ipv4.ip_forward.*/net.ipv4.ip_forward=0/g" /etc/sysctl.conf
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sed -i "s/# net.ipv6.conf.all.forwarding.*/net.ipv6.conf.all.forwarding=0/g" /etc/sysctl.conf
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if ! grep -q "ignore pings" /etc/sysctl.conf; then
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echo '# ignore pings' >> /etc/sysctl.conf
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echo 'net.ipv4.icmp_echo_ignore_all = 1' >> /etc/sysctl.conf
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echo 'net.ipv6.icmp_echo_ignore_all = 1' >> /etc/sysctl.conf
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fi
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if ! grep -q "disable ipv6" /etc/sysctl.conf; then
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echo '# disable ipv6' >> /etc/sysctl.conf
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echo 'net.ipv6.conf.all.disable_ipv6 = 1' >> /etc/sysctl.conf
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fi
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if ! grep -q "net.ipv4.tcp_synack_retries" /etc/sysctl.conf; then
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echo 'net.ipv4.tcp_synack_retries = 2' >> /etc/sysctl.conf
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echo 'net.ipv4.tcp_syn_retries = 1' >> /etc/sysctl.conf
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fi
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if ! grep -q "keepalive" /etc/sysctl.conf; then
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echo '# keepalive' >> /etc/sysctl.conf
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echo 'net.ipv4.tcp_keepalive_probes = 9' >> /etc/sysctl.conf
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echo 'net.ipv4.tcp_keepalive_intvl = 75' >> /etc/sysctl.conf
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echo 'net.ipv4.tcp_keepalive_time = 7200' >> /etc/sysctl.conf
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fi
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if ! grep -q "net.ipv4.conf.default.send_redirects" /etc/sysctl.conf; then
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echo "net.ipv4.conf.default.send_redirects = 0" >> /etc/sysctl.conf
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else
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sed -i "s|# net.ipv4.conf.default.send_redirects.*|net.ipv4.conf.default.send_redirects = 0|g" /etc/sysctl.conf
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sed -i "s|#net.ipv4.conf.default.send_redirects.*|net.ipv4.conf.default.send_redirects = 0|g" /etc/sysctl.conf
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sed -i "s|net.ipv4.conf.default.send_redirects.*|net.ipv4.conf.default.send_redirects = 0|g" /etc/sysctl.conf
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fi
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if ! grep -q "net.ipv4.conf.all.secure_redirects" /etc/sysctl.conf; then
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echo "net.ipv4.conf.all.secure_redirects = 0" >> /etc/sysctl.conf
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else
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sed -i "s|# net.ipv4.conf.all.secure_redirects.*|net.ipv4.conf.all.secure_redirects = 0|g" /etc/sysctl.conf
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sed -i "s|#net.ipv4.conf.all.secure_redirects.*|net.ipv4.conf.all.secure_redirects = 0|g" /etc/sysctl.conf
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sed -i "s|net.ipv4.conf.all.secure_redirects.*|net.ipv4.conf.all.secure_redirects = 0|g" /etc/sysctl.conf
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fi
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if ! grep -q "net.ipv4.conf.default.accept_source_route" /etc/sysctl.conf; then
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echo "net.ipv4.conf.default.accept_source_route = 0" >> /etc/sysctl.conf
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else
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sed -i "s|# net.ipv4.conf.default.accept_source_route.*|net.ipv4.conf.default.accept_source_route = 0|g" /etc/sysctl.conf
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sed -i "s|#net.ipv4.conf.default.accept_source_route.*|net.ipv4.conf.default.accept_source_route = 0|g" /etc/sysctl.conf
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sed -i "s|net.ipv4.conf.default.accept_source_route.*|net.ipv4.conf.default.accept_source_route = 0|g" /etc/sysctl.conf
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fi
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if ! grep -q "net.ipv4.conf.default.secure_redirects" /etc/sysctl.conf; then
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echo "net.ipv4.conf.default.secure_redirects = 0" >> /etc/sysctl.conf
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else
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sed -i "s|# net.ipv4.conf.default.secure_redirects.*|net.ipv4.conf.default.secure_redirects = 0|g" /etc/sysctl.conf
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sed -i "s|#net.ipv4.conf.default.secure_redirects.*|net.ipv4.conf.default.secure_redirects = 0|g" /etc/sysctl.conf
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sed -i "s|net.ipv4.conf.default.secure_redirects.*|net.ipv4.conf.default.secure_redirects = 0|g" /etc/sysctl.conf
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fi
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if ! grep -q "net.ipv4.conf.default.accept_redirects" /etc/sysctl.conf; then
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echo "net.ipv4.conf.default.accept_redirects = 0" >> /etc/sysctl.conf
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else
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sed -i "s|# net.ipv4.conf.default.accept_redirects.*|net.ipv4.conf.default.accept_redirects = 0|g" /etc/sysctl.conf
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sed -i "s|#net.ipv4.conf.default.accept_redirects.*|net.ipv4.conf.default.accept_redirects = 0|g" /etc/sysctl.conf
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sed -i "s|net.ipv4.conf.default.accept_redirects.*|net.ipv4.conf.default.accept_redirects = 0|g" /etc/sysctl.conf
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fi
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mark_completed $FUNCNAME
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}
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function mesh_firewall {
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FIREWALL_FILENAME=${rootdir}/etc/systemd/system/meshfirewall.service
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MESH_FIREWALL_SCRIPT=${rootdir}/usr/bin/mesh-firewall
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echo '#!/bin/bash' > $MESH_FIREWALL_SCRIPT
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echo 'iptables -P INPUT ACCEPT' >> $MESH_FIREWALL_SCRIPT
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echo 'ip6tables -P INPUT ACCEPT' >> $MESH_FIREWALL_SCRIPT
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echo 'iptables -F' >> $MESH_FIREWALL_SCRIPT
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echo 'ip6tables -F' >> $MESH_FIREWALL_SCRIPT
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echo 'iptables -t nat -F' >> $MESH_FIREWALL_SCRIPT
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echo 'ip6tables -t nat -F' >> $MESH_FIREWALL_SCRIPT
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echo 'iptables -X' >> $MESH_FIREWALL_SCRIPT
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echo 'ip6tables -X' >> $MESH_FIREWALL_SCRIPT
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echo 'iptables -P INPUT DROP' >> $MESH_FIREWALL_SCRIPT
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echo 'ip6tables -P INPUT DROP' >> $MESH_FIREWALL_SCRIPT
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echo 'iptables -A INPUT -i lo -j ACCEPT' >> $MESH_FIREWALL_SCRIPT
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echo 'iptables -A INPUT -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT' >> $MESH_FIREWALL_SCRIPT
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echo '' >> $MESH_FIREWALL_SCRIPT
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echo '# Make sure incoming tcp connections are SYN packets' >> $MESH_FIREWALL_SCRIPT
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echo 'iptables -A INPUT -p tcp ! --syn -m state --state NEW -j DROP' >> $MESH_FIREWALL_SCRIPT
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echo '' >> $MESH_FIREWALL_SCRIPT
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echo '# Drop packets with incoming fragments' >> $MESH_FIREWALL_SCRIPT
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echo 'iptables -A INPUT -f -j DROP' >> $MESH_FIREWALL_SCRIPT
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echo '' >> $MESH_FIREWALL_SCRIPT
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echo '# Drop bogons' >> $MESH_FIREWALL_SCRIPT
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echo 'iptables -A INPUT -p tcp --tcp-flags ALL ALL -j DROP' >> $MESH_FIREWALL_SCRIPT
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echo 'iptables -A INPUT -p tcp --tcp-flags ALL FIN,PSH,URG -j DROP' >> $MESH_FIREWALL_SCRIPT
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echo 'iptables -A INPUT -p tcp --tcp-flags ALL SYN,RST,ACK,FIN,URG -j DROP' >> $MESH_FIREWALL_SCRIPT
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echo '' >> $MESH_FIREWALL_SCRIPT
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echo '# Incoming malformed NULL packets:' >> $MESH_FIREWALL_SCRIPT
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echo 'iptables -A INPUT -p tcp --tcp-flags ALL NONE -j DROP' >> $MESH_FIREWALL_SCRIPT
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echo '' >> $MESH_FIREWALL_SCRIPT
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echo "iptables -A INPUT -p tcp --dport $TOX_PORT -j ACCEPT" >> $MESH_FIREWALL_SCRIPT
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echo "iptables -A INPUT -i $WIFI_INTERFACE -p udp --dport $ZERONET_PORT -j ACCEPT" >> $MESH_FIREWALL_SCRIPT
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echo "iptables -A INPUT -i $WIFI_INTERFACE -p tcp --dport $ZERONET_PORT -j ACCEPT" >> $MESH_FIREWALL_SCRIPT
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echo "iptables -A INPUT -i $WIFI_INTERFACE -p udp --dport $TRACKER_PORT -j ACCEPT" >> $MESH_FIREWALL_SCRIPT
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echo "iptables -A INPUT -i $WIFI_INTERFACE -p tcp --dport $TRACKER_PORT -j ACCEPT" >> $MESH_FIREWALL_SCRIPT
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echo "iptables -A INPUT -i $WIFI_INTERFACE -p udp --dport 1900 -j ACCEPT" >> $MESH_FIREWALL_SCRIPT
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chmod +x $MESH_FIREWALL_SCRIPT
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echo '[Unit]' > $FIREWALL_FILENAME
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echo 'Description=Mesh Firewall' >> $FIREWALL_FILENAME
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echo '' >> $FIREWALL_FILENAME
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echo '[Service]' >> $FIREWALL_FILENAME
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echo 'Type=oneshot' >> $FIREWALL_FILENAME
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echo 'ExecStart=/usr/bin/mesh-firewall' >> $FIREWALL_FILENAME
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echo 'RemainAfterExit=no' >> $FIREWALL_FILENAME
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echo '' >> $FIREWALL_FILENAME
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echo 'TimeoutSec=30' >> $FIREWALL_FILENAME
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echo '' >> $FIREWALL_FILENAME
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echo '[Install]' >> $FIREWALL_FILENAME
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echo 'WantedBy=multi-user.target' >> $FIREWALL_FILENAME
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chmod +x $FIREWALL_FILENAME
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chroot "$rootdir" systemctl enable meshfirewall
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}
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function firewall_add {
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firewall_name=$(echo "$1" | sed "s| |-|g")
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firewall_port=$2
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firewall_protocol="$3"
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if ! grep -q "${firewall_name}=${firewall_port}" $FIREWALL_CONFIG; then
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echo "${firewall_name}=${firewall_port}" >> $FIREWALL_CONFIG
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if [ ! ${firewall_protocol} ]; then
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iptables -A INPUT -p udp --dport ${firewall_port} -j ACCEPT
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iptables -A INPUT -p tcp --dport ${firewall_port} -j ACCEPT
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else
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if [[ "${firewall_protocol}" == *"udp"* ]]; then
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iptables -A INPUT -p udp --dport ${firewall_port} -j ACCEPT
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fi
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if [[ "${firewall_protocol}" == *"tcp"* ]]; then
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iptables -A INPUT -p tcp --dport ${firewall_port} -j ACCEPT
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fi
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fi
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save_firewall_settings
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fi
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}
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function firewall_add_range {
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firewall_name=$(echo "$1" | sed "s| |-|g")
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firewall_port_start=$2
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firewall_port_end=$3
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firewall_protocol="$4"
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if ! grep -q "${firewall_name}=${firewall_port_start}:${firewall_port_end}" $FIREWALL_CONFIG; then
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echo "${firewall_name}=${firewall_port_start}:${firewall_port_end}" >> $FIREWALL_CONFIG
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if [ ! ${firewall_protocol} ]; then
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iptables -A INPUT -p udp --dport ${firewall_port_start}:${firewall_port_end} -j ACCEPT
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iptables -A INPUT -p tcp --dport ${firewall_port_start}:${firewall_port_end} -j ACCEPT
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else
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if [[ "${firewall_protocol}" == *"udp"* ]]; then
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iptables -A INPUT -p udp --dport ${firewall_port_start}:${firewall_port_end} -j ACCEPT
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fi
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if [[ "${firewall_protocol}" == *"tcp"* ]]; then
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iptables -A INPUT -p tcp --dport ${firewall_port_start}:${firewall_port_end} -j ACCEPT
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fi
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fi
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save_firewall_settings
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fi
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}
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function firewall_remove {
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firewall_port=$1
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firewall_protocol="$2"
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if [ ! -f $FIREWALL_CONFIG ]; then
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return
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fi
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if grep -q "=${firewall_port}" $FIREWALL_CONFIG; then
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if [ ! ${firewall_protocol} ]; then
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iptables -D INPUT -p udp --dport ${firewall_port} -j ACCEPT
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iptables -D INPUT -p tcp --dport ${firewall_port} -j ACCEPT
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|
else
|
|
if [[ "${firewall_protocol}" == *"udp"* ]]; then
|
|
iptables -D INPUT -p udp --dport ${firewall_port} -j ACCEPT
|
|
fi
|
|
if [[ "${firewall_protocol}" == *"tcp"* ]]; then
|
|
iptables -D INPUT -p tcp --dport ${firewall_port} -j ACCEPT
|
|
fi
|
|
fi
|
|
sed -i "/=${firewall_port}/d" $FIREWALL_CONFIG
|
|
save_firewall_settings
|
|
fi
|
|
}
|
|
|
|
function domain_to_hex_string {
|
|
domain="$1"
|
|
ctr = 1
|
|
segment=$(echo "$domain" | awk -F '.' "{print \$$ctr}")
|
|
while [ ${#segment} -gt 0 ]
|
|
do
|
|
hexnum=$(echo "obase=16; $segment" | bc)
|
|
if [ ${hexnum} -lt 2 ]; then
|
|
echo -n "|0${hexnum}|$segment"
|
|
else
|
|
echo -n "|$hexnum|$segment"
|
|
fi
|
|
ctr=$((ctr + 1))
|
|
segment=$(echo "$domain" | awk -F '.' "{print \$$ctr}")
|
|
done
|
|
echo ""
|
|
}
|
|
|
|
function firewall_block_domain {
|
|
blocked_domain="$1"
|
|
if ! grep "$blocked_domain" $FIREWALL_DOMAINS; then
|
|
hexstr=$(domain_to_hex_string $blocked_domain)
|
|
iptables -I FORWARD -p udp --dport 53 -m string --hex-string "$hexstr" --algo bm -j DROP
|
|
iptables -I FORWARD -p tcp --dport 53 -m string --hex-string "$hexstr" --algo bm -j DROP
|
|
echo "${blocked_domain}" >> $FIREWALL_DOMAINS
|
|
save_firewall_settings
|
|
fi
|
|
}
|
|
|
|
function firewall_unblock_domain {
|
|
unblocked_domain="$1"
|
|
if grep "${unblocked_domain}" $FIREWALL_DOMAINS; then
|
|
hexstr=$(domain_to_hex_string $unblocked_domain)
|
|
iptables -D FORWARD -p udp --dport 53 -m string --hex-string "$hexstr" --algo bm -j DROP
|
|
iptables -D FORWARD -p tcp --dport 53 -m string --hex-string "$hexstr" --algo bm -j DROP
|
|
sed -i "/${unblocked_domain}/d" $FIREWALL_DOMAINS
|
|
save_firewall_settings
|
|
fi
|
|
}
|
|
|
|
# NOTE: deliberately no exit 0
|