#!/usr/bin/env bash ### BEGIN INIT INFO # Provides: ip6t-firewall # Required-Start: $local_fs $remote_fs $syslog $network $time # Required-Stop: $local_fs $remote_fs $syslog $network # Should-Start: # Should-Stop: # Default-Start: 2 3 4 5 # Default-Stop: 0 1 6 # Short-Description: IPv6 Firewall ### END INIT INFO CONFIG_DIR="/etc/ipt-firewall" CONFIG_FILE="${CONFIG_DIR}/ip6t-firewall-server.conf" if [[ -z "$fail2ban_client" ]]; then fail2ban_client="$(which fail2ban-client)" fi # ------------- Load Kernel Modules ------------- # # Load appropriate modules. if ! $host_is_vm ; then /sbin/modprobe ip6_tables /sbin/modprobe ip6table_filter /sbin/modprobe ip6t_REJECT fi # # ------------- End: Load Kernel Modules ------------- echo echo -e "\033[37m\033[1m\tStarting firewall iptables (IPv6)..\033[m" echo ## -------------------------------------------------------------------------- ## --- All Configurations will be done in /etc/ipt-firewall/ipt-firewall.conf ## -------------------------------------------------------------------------- if [[ -f "$CONFIG_FILE" ]]; then source $CONFIG_FILE else echo echo -e "\033[31m\033[1m\tNo Configuration File found..\033[m \033[37m\033[1mExiting now!\033[m" echo exit 1 fi # ------------- # --- Activate IP Forwarding # ------------- if ! $host_is_vm ; then # --- # - Disable ip forwarding between interfaces # --- if $kernel_forward_between_interfaces ; then echononl "\tActivate Forwarding.." echo 1 > /proc/sys/net/ipv6/conf/all/forwarding else echononl "\t\033[33m\033[1mDisable Forwarding..\033[m" echo 0 > /proc/sys/net/ipv6/conf/all/forwarding fi echo_done fi # ------------- # --- Adjust Kernel Parameters (Security/Tuning) # ------------- echononl "\tAdjust Kernel Parameters (Security/Tuning).." if ! $host_is_vm ; then # --- # - Deactivate Source Routed Packets # --- for asr in /proc/sys/net/ipv6/conf/*/accept_source_route; do if $kernel_deactivate_source_route ; then echo 0 > $asr fi done # --- # - Deactivate sending ICMP redirects # --- if $kernel_dont_accept_redirects ; then echo "0" > /proc/sys/net/ipv6/conf/all/accept_redirects fi echo_done # Adjust Kernel Parameters (Security/Tuning) else echo_skipped fi # if ! $host_is_vm # ------------- Stop Fail2Ban if installed ------------- # if [ -x "$fail2ban_client" ]; then echononl "\tStopping fail2ban.." $fail2ban_client stop > /dev/null 2>&1 if [ "$?" = "0" ];then echo_done else echo_warning fi fi # # ------------- Ende: Stop Fail2Ban if installed ------------- # ------------- # --- Set default policies / Flush Rules # ------------- echo echononl "\tFlushing firewall iptable (IPv6).." # - default policies # - $ip6t -P INPUT ACCEPT $ip6t -P OUTPUT ACCEPT $ip6t -P FORWARD ACCEPT ## - flush chains ## - $ip6t -F $ip6t -F INPUT $ip6t -F OUTPUT $ip6t -F FORWARD $ip6t -F -t mangle $ip6t -F -t nat $ip6t -F -t raw $ip6t -X $ip6t -Z echo_done # Flushing firewall iptable (IPv6).. echo # ------------- # --- Prevent bridged traffic getting pushed through the host's iptables rules # ------------- echononl "\tDo not firewall bridged traffic" if $do_not_firewall_bridged_traffic ; then # - Matches if the packet is being bridged and therefore is not being routed. # - This is only useful in the FORWARD and POSTROUTING chains. # - $ip6t -I FORWARD -m physdev --physdev-is-bridged -j ACCEPT # - Matches if the packet has entered through a bridge interface. # - $ip6t -I FORWARD -m physdev --physdev-is-in -j ACCEPT # - Matches if the packet will leave through a bridge interface. # - $ip6t -I FORWARD -m physdev --physdev-is-out -j ACCEPT echo_done else echo_skipped fi echo # ------------- # ------------ Stopping firewall if only flushing was requested (parameter flush) # ------------- case $1 in flush) echo echo -e "\t\033[37m\033[1mFlushing firewall was requested. No more rules..\033[m" echo exit 0;; esac # ------------- # --- Pass through Devices Interfaces (not firewalled) # ------------- if [[ ${#unprotected_if_arr[@]} -gt 0 ]]; then echononl "\tPass through Devices (not firewalled)" for _dev in ${unprotected_if_arr[@]} ; do if $log_unprotected || $log_all ; then $ip6t -A INPUT -i $_dev -j LOG --log-prefix "$log_prefix Not firewalled ${_dev}: " --log-level $log_level $ip6t -A OUTPUT -o $_dev -j LOG --log-prefix "$log_prefix Not firewalled ${_dev}: " --log-level $log_level $ip6t -A FORWARD -i $_dev -j LOG --log-prefix "$log_prefix Not firewalled ${_dev}: " --log-level $log_level $ip6t -A FORWARD -o $_dev -j LOG --log-prefix "$log_prefix Not firewalled ${_dev}: " --log-level $log_level fi $ip6t -A INPUT -i $_dev -j ACCEPT $ip6t -A OUTPUT -o $_dev -j ACCEPT $ip6t -A FORWARD -i $_dev -j ACCEPT $ip6t -A FORWARD -o $_dev -j ACCEPT done echo_done fi # ------------- # --- Block IPs / Networks / Interfaces # ------------- echononl "\tBlock IPs / Networks / Interfaces.." # --- # - Block IPs # --- for _ip in $blocked_ips ; do for _dev in ${ext_if_arr[@]} ; do if $log_blocked_ip || $log_all ; then $ip6t -A INPUT -i $_dev -s $_ip -j LOG --log-prefix "$log_prefix Blocked ${_ip}: " --log-level $log_level if $kernel_forward_between_interfaces ; then $ip6t -A FORWARD -i $_dev -s $_ip -j LOG --log-prefix "$log_prefix Blocked ${_ip}: " --log-level $log_level fi fi $ip6t -A INPUT -i $_dev -s $_ip -j DROP if $kernel_forward_between_interfaces ; then $ip6t -A FORWARD -i $_dev -s $_ip -j DROP fi done done # --- # - Block Interfaces # --- for _if in ${blocked_if_arr[@]} ; do if $log_blocked_if || $log_all ; then if $kernel_forward_between_interfaces ; then $ip6t -A FORWARD -i $_if -j LOG --log-prefix "$log_prefix Blocked IF ${_if}: " --log-level $log_level $ip6t -A FORWARD -o $_if -j LOG --log-prefix "$log_prefix Blocked IF ${_if}: " --log-level $log_level fi $ip6t -A INPUT -i $_if -j LOG --log-prefix "$log_prefix Blocked IF ${_if}: " --log-level $log_level $ip6t -A OUTPUT -o $_if -j LOG --log-prefix "$log_prefix Blocked IF ${_if}: " --log-level $log_level fi if $kernel_forward_between_interfaces ; then $ip6t -A FORWARD -i $_if -j DROP $ip6t -A FORWARD -o $_if -j DROP fi $ip6t -A INPUT -i $_if -j DROP $ip6t -A OUTPUT -o $_if -j DROP done echo_done # Block IPs / Networks / Interfaces.. # --- # - Block IPs/Netwoks reading from file 'ban_ipv6.list'" # --- echononl "\tBlock IPs/Netwoks reading from file 'ban_ipv6.list' .." if [[ -f "${CONFIG_DIR}/ban_ipv6.list" ]] ; then declare -a ban_ipv6_arr=() declare -a no_valid_ipv6=() # Regex valid ipv6 address # _regex_ipv6='^([0-9a-fA-F]{0,4}:){1,7}[0-9a-fA-F]{0,4}$' while IFS='' read -r _line || [[ -n $_line ]] ; do is_valid_ipv6=false is_valid_mask=false ipv6="" mask="" # Ignore comment lines # [[ $_line =~ ^[[:space:]]{0,}# ]] && continue # Ignore blank lines # [[ $_line =~ ^[[:space:]]*$ ]] && continue # Remove leading whitespace characters # _line="${_line#"${_line%%[![:space:]]*}"}" # Catch ipv6 Address # given_ipv6="$(echo $_line | cut -d ' ' -f1)" # Splitt ipv6 address from possible given CIDR number # IFS='/' read -ra _addr <<< "$given_ipv6" ipv6="${_addr[0]}" # Test mask if given # if [[ -n "${_addr[1]}" ]] ; then mask="${_addr[1]}" # Is 'mask' a valid CIDR number? If not, test agains a valid netmask # if $(test -z "${mask##*[!0-9]*}" > /dev/null 2>&1) ; then # Its not a vaild mask number, but naybe a valit netmask. # no_valid_ipv6_arr+=("$given_ipv6") else if [[ $mask -gt 128 ]]; then # Its not a vaild cidr number, but naybe a valit netmask. # no_valid_ipv6_arr+=("$given_ipv6") else is_valid_mask=true fi fi else mask=64 is_valid_mask=true fi # Check if given ipv6 address is valif if [[ "$ipv6" =~ ${_regex_ipv6} ]]; then is_valid_ipv6=true fi if $is_valid_ipv6 && $is_valid_mask; then _ip="${ipv6}/${mask}" if containsElement "$_ip" "${ban_ipv6_arr[@]}" ; then continue fi for _dev in ${ext_if_arr[@]} ; do if $log_blocked_ip || $log_all ; then $ip6t -A INPUT -i $_dev -s $_ip -j LOG --log-prefix "$log_prefix Blocked: " --log-level $log_level if $kernel_activate_forwarding ; then $ip6t -A FORWARD -i $_dev -s $_ip -j LOG --log-prefix "$log_prefix Blocked: " --log-level $log_level fi fi $ip6t -A INPUT -i $_dev -s $_ip -j DROP if $kernel_activate_forwarding ; then $ip6t -A FORWARD -i $_dev -s $_ip -j DROP fi done ban_ipv6_arr+=("$_ip") else if ! containsElement "$given_ipv6" "${no_valid_ipv6_arr[@]}" ; then no_valid_ipv6_arr+=("$given_ipv6") fi fi done < "${CONFIG_DIR}/ban_ipv6.list" echo_done if [[ ${#no_valid_ipv6_arr[@]} -gt 0 ]]; then warn "Ignored: ${no_valid_ipv6_arr[@]}" fi else echo_skipped fi # --- # - Allow Forwarding certain private Addresses # --- if [[ ${#forward_private_ip_arr[@]} -gt 0 ]] ; then echononl "\tAllow forwarding (private) IPs / IP-Ranges.." for _ip in ${forward_private_ip_arr[@]}; do if $kernel_forward_between_interfaces ; then $ip6t -A FORWARD -d $_ip -j ACCEPT $ip6t -A FORWARD -s $_ip -j ACCEPT echo_done else echo_skipped fi done fi # ------------- # --- Protections against several attacks / unwanted packages # ------------- echo echononl "\tProtections against several attacks / unwanted packages.." # --- # - Protection against syn-flooding # --- $ip6t -N syn-flood $ip6t -A syn-flood -m limit --limit 1/second --limit-burst 3 -j RETURN if $log_syn_flood || $log_all ; then $ip6t -A syn-flood -j LOG --log-prefix "$log_prefix SYN flood: " --log-level $log_level fi $ip6t -A syn-flood -j DROP # --- # - drop new packages without syn flag # --- if $log_new_not_sync || $log_all ; then $ip6t -A INPUT -p tcp ! --syn -m state --state NEW -j LOG --log-prefix "$log_prefix New but not SYN: " --log-level $log_level $ip6t -A OUTPUT -p tcp ! --syn -m state --state NEW -j LOG --log-prefix "$log_prefix New but not SYN: " --log-level $log_level if $kernel_forward_between_interfaces ; then $ip6t -A FORWARD -p tcp ! --syn -m state --state NEW -j LOG --log-prefix "$log_prefix New but not SYN: " --log-level $log_level fi fi $ip6t -A INPUT -p tcp ! --syn -m state --state NEW -j DROP $ip6t -A OUTPUT -p tcp ! --syn -m state --state NEW -j DROP if $kernel_forward_between_interfaces ; then $ip6t -A FORWARD -p tcp ! --syn -m state --state NEW -j DROP fi # --- # - drop invalid packages # --- if $log_invalid_state || $log_all ; then $ip6t -A INPUT -m state --state INVALID -j LOG --log-prefix "$log_prefix Invalid state: " --log-level $log_level if $kernel_forward_between_interfaces ; then $ip6t -A FORWARD -m state --state INVALID -j LOG --log-prefix "$log_prefix Invalid state: " --log-level $log_level fi fi $ip6t -A INPUT -m state --state INVALID -j DROP if $kernel_forward_between_interfaces ; then $ip6t -A FORWARD -m state --state INVALID -j DROP fi # --- # - ungewöhnliche Flags verwerfen # --- for _dev in ${ext_if_arr[@]} ; do if $log_invalid_flags || $log_all ; then $ip6t -A INPUT -i $_dev -p tcp --tcp-flags ALL ACK,RST,SYN,FIN -j LOG --log-prefix "$log_prefix Invalid flags: " --log-level $log_level $ip6t -A INPUT -i $_dev -p tcp --tcp-flags SYN,FIN SYN,FIN -j LOG --log-prefix "$log_prefix Invalid flags: " --log-level $log_level $ip6t -A INPUT -i $_dev -p tcp --tcp-flags SYN,RST SYN,RST -j LOG --log-prefix "$log_prefix Invalid flags: " --log-level $log_level if $kernel_forward_between_interfaces ; then $ip6t -A FORWARD -i $_dev -p tcp --tcp-flags ALL ACK,RST,SYN,FIN -j LOG --log-prefix "$log_prefix Invalid flags: " --log-level $log_level $ip6t -A FORWARD -i $_dev -p tcp --tcp-flags SYN,FIN SYN,FIN -j LOG --log-prefix "$log_prefix Invalid flags: " --log-level $log_level $ip6t -A FORWARD -i $_dev -p tcp --tcp-flags SYN,RST SYN,RST -j LOG --log-prefix "$log_prefix Invalid flags: " --log-level $log_level fi fi $ip6t -A INPUT -i $_dev -p tcp --tcp-flags ALL ACK,RST,SYN,FIN -j DROP $ip6t -A INPUT -i $_dev -p tcp --tcp-flags SYN,FIN SYN,FIN -j DROP $ip6t -A INPUT -i $_dev -p tcp --tcp-flags SYN,RST SYN,RST -j DROP if $kernel_forward_between_interfaces ; then $ip6t -A FORWARD -i $_dev -p tcp --tcp-flags ALL ACK,RST,SYN,FIN -j DROP $ip6t -A FORWARD -i $_dev -p tcp --tcp-flags SYN,FIN SYN,FIN -j DROP $ip6t -A FORWARD -i $_dev -p tcp --tcp-flags SYN,RST SYN,RST -j DROP fi done # --- # - Refuse private addresses on extern interfaces # --- # - Refuse spoofed packets pretending to be from your IP address. if $log_spoofed || $log_all ; then for _ip in ${ext_ip_arr[@]} ; do $ip6t -A INPUT -s $_ip -d $_ip -j LOG --log-prefix "$log_prefix Spoofed (own ip): " --log-level $log_level if $kernel_forward_between_interfaces ; then $ip6t -A FORWARD -s $_ip -d $_ip -j LOG --log-prefix "$log_prefix Spoofed (own ip): " --log-level $log_level fi done fi for _ip in ${ext_ip_arr[@]} ; do $ip6t -A INPUT -i $_dev -s $_ip -d $_ip -j DROP if $kernel_forward_between_interfaces ; then $ipi6t -A FORWARD -s $_ip -d $_ip -j DROP fi done # - private Adressen auf externen interface verwerfen for _dev in ${ext_if_arr[@]} ; do if $log_spoofed || $log_all ; then $ip6t -A INPUT -i $_dev -s $ula_block -j LOG --log-prefix "$log_prefix Private (ula_block): " --log-level $log_level $ip6t -A INPUT -i $_dev -s $loopback -j LOG --log-prefix "$log_prefix (loopback): " --log-level $log_level if $kernel_forward_between_interfaces ; then $ip6t -A FORWARD -i $_dev -s $ula_block -j LOG --log-prefix "$log_prefix Private (ula_block): " --log-level $log_level $ip6t -A FORWARD -i $_dev -s $loopback -j LOG --log-prefix "$log_prefix (loopback): " --log-level $log_level fi fi $ip6t -A INPUT -i $_dev -s $ula_block -j DROP $ip6t -A INPUT -i $_dev -s $loopback -j DROP if $kernel_forward_between_interfaces ; then $ip6t -A FORWARD -i $_dev -s $ula_block -j DROP $ip6t -A FORWARD -i $_dev -s $loopback -j DROP fi # Don't allow spoofing from that server $ip6t -A OUTPUT -o $_dev -s $ula_block -j DROP $ip6t -A OUTPUT -o $_dev -s $loopback -j DROP if $kernel_forward_between_interfaces ; then $ip6t -A FORWARD -o $_dev -s $ula_block -j DROP $ip6t -A FORWARD -o $_dev -s $loopback -j DROP fi done echo_done # ------------- # ------------- Stopping firewall here if requested (parameter stop) # ------------- case $1 in sto*) #echononl "Stopping firewall iptable (IPv6).." echo echo -e "\t\033[37m\033[1mStop was requested. No more rules..\033[m" echo exit 0;; esac echo # ------------- # --- Traffic Counter (used by munin) # ------------- echononl "\tCreate Traffic Counter (used by munin)" if $create_traffic_counter ; then for _ip in ${ext_ip_arr[@]} ; do $ip6t -A INPUT -d $_ip $ip6t -A INPUT -s $_ip if $kernel_forward_between_interfaces ; then $ip6t -A FORWARD -d $_ip $ip6t -A FORWARD -s $_ip fi done echo_done else echo_skipped fi # ------------- # --- iPerf # ------------- # iPerf is a tool for active measurements of the maximum achievable bandwidth on IP networks. # It supports tuning of various parameters related to timing, buffers and protocols (TCP, UDP, # SCTP with IPv4 and IPv6). For each test it reports the bandwidth, loss, and other parameters. echononl "\tCreate \"iPerf\" rules.." if $create_iperf_rules ; then $ip6t -A INPUT -p tcp --dport 5001 -j ACCEPT $ip6t -A INPUT -p tcp --sport 5001 -j ACCEPT # $ip6t -A OUTPUT -p tcp --dport 5001 -j ACCEPT $ip6t -A OUTPUT -p tcp --sport 5001 -j ACCEPT if $kernel_forward_between_interfaces ; then $ip6t -A FORWARD -p tcp --dport 5001 -j ACCEPT $ip6t -A FORWARD -p tcp --sport 5001 -j ACCEPT fi echo_done else echo_skipped fi # ------------- # --- Generally prohibited # ------------- echononl "\tGenerally prohibited traffic.." for _dev in ${ext_if_arr[@]} ; do if $log_prohibited || $log_all ; then for _port in ${block_tcp_port_arr[@]} ; do $ip6t -A INPUT -p tcp -i $_dev --dport $_port -j LOG --log-prefix "$log_prefix gen. prohibited: " --log-level $log_level done for _port in ${block_udp_port_arr[@]} ; do $ip6t -A INPUT -p udp -i $_dev --dport $_port -j LOG --log-prefix "$log_prefix gen. prohibited: " --log-level $log_level done if $kernel_forward_between_interfaces ; then for _port in ${block_tcp_port_arr[@]} ; do $ip6t -A FORWARD -p tcp -i $_dev --dport $_port -j LOG --log-prefix "$log_prefix gen. prohibited: " --log-level $log_level done for _port in ${block_udp_port_arr[@]} ; do $ip6t -A FORWARD -p udp -i $_dev --dport $_port -j LOG --log-prefix "$log_prefix gen. prohibited: " --log-level $log_level done fi fi for _port in ${block_tcp_port_arr[@]} ; do $ip6t -A INPUT -p tcp -i $_dev --dport $_port -j DROP done for _port in ${block_udp_port_arr[@]} ; do $ip6t -A INPUT -p udp -i $_dev --dport $_port -j DROP done if $kernel_forward_between_interfaces ; then for _port in ${block_tcp_port_arr[@]} ; do $ip6t -A FORWARD -p tcp -i $_dev --dport $_port -j DROP done for _port in ${block_udp_port_arr[@]} ; do $ip6t -A FORWARD -p udp -i $_dev --dport $_port -j DROP done fi done echo_done echo # ------------- # --- Traffic generally allowed # ------------- echononl "\tLoopback device generally allowed.." # --- # - Loopback device # --- $ip6t -A INPUT -i lo -j ACCEPT $ip6t -A OUTPUT -o lo -j ACCEPT echo_done # --- # - Already established connections # --- echononl "\tAccept already established connections.." $ip6t -A INPUT -p ALL -m state --state ESTABLISHED,RELATED -j ACCEPT $ip6t -A OUTPUT -p ALL -m state --state ESTABLISHED,RELATED -j ACCEPT if $kernel_forward_between_interfaces ; then $ip6t -A FORWARD -p ALL -m state --state ESTABLISHED,RELATED -j ACCEPT fi echo_done # --- # - Permit all traffic through VPN lines # --- echononl "\tPermit all traffic through VPN lines.." for _vpn_if in ${vpn_if_arr[@]} ; do $ip6t -A INPUT -i $_vpn_if -m state --state NEW -j ACCEPT $ip6t -A OUTPUT -o $_vpn_if -m state --state NEW -j ACCEPT if $kernel_forward_between_interfaces ; then $ip6t -A FORWARD -i $_vpn_if -m state --state NEW -j ACCEPT $ip6t -A FORWARD -o $_vpn_if -m state --state NEW -j ACCEPT fi done echo_done echo # ------------- # ---- Restrict local Servive to given (extern) IP-Address/Network # ------------- echononl "\tRestrict local Servive to given (extern) IP-Address/Network" if [[ ${#restrict_local_service_to_net_arr[@]} -gt 0 ]] ; then _deny_service_arr=() for _val in "${restrict_local_service_to_net_arr[@]}" ; do IFS=',' read -a _val_arr <<< "${_val}" for _dev in ${ext_if_arr[@]} ; do $ip6t -A INPUT -i $_dev -p ${_val_arr[3]} -s ${_val_arr[0]} -d ${_val_arr[1]} --dport ${_val_arr[2]} -m state --state NEW -j ACCEPT if ! containsElement "${_dev},${_val_arr[1]},${_val_arr[2]},${_val_arr[3]}" "${_deny_service_arr[@]}" ; then _deny_service_arr+=("${_dev},${_val_arr[1]},${_val_arr[2]},${_val_arr[3]}") fi done done for _val in "${_deny_service_arr[@]}" ; do IFS=',' read -a _val_arr <<< "${_val}" $ip6t -A INPUT -i ${_val_arr[0]} -p ${_val_arr[3]} -d ${_val_arr[1]} --dport ${_val_arr[2]} -j DROP done echo_done else echo_skipped fi # ------------- # ---- Restrict local Network to given extern IP-Address/Network # ------------- echononl "\tRestrict local Address/Network to given extern Address/Network" if [[ ${#restrict_local_net_to_net_arr[@]} -gt 0 ]] ; then _deny_net_arr=() for _val in "${restrict_local_net_to_net_arr[@]}" ; do IFS=',' read -a _val_arr <<< "${_val}" for _dev in ${ext_if_arr[@]} ; do $ip6t -A INPUT -i $_dev -s ${_val_arr[0]} -d ${_val_arr[1]} -m state --state NEW -j ACCEPT if ! containsElement "${_dev},${_val_arr[1]}" "${_deny_net_arr[@]}" ; then _deny_net_arr+=("${_dev},${_val_arr[1]}") fi done done for _val in "${_deny_net_arr[@]}" ; do IFS=',' read -a _val_arr <<< "${_val}" $ip6t -A INPUT -i ${_val_arr[0]} -d ${_val_arr[1]} -j DROP done echo_done else echo_skipped fi # ------------- # --- Services # ------------- echo echo -e "\t\033[37m\033[1mAdd Rules for Services..\033[m" # ------------- # ---- Allow extern Service # ------------- echononl "\t\tAllow extern Service" if [[ ${#allow_ext_service_arr[@]} -gt 0 ]] ; then for _dev in "${ext_if_arr[@]}" ; do for _val in "${allow_ext_service_arr[@]}" ; do IFS=',' read -a _val_arr <<< "${_val}" $ip6t -A OUTPUT -o $_dev -p ${_val_arr[2]} -d ${_val_arr[0]} --dport ${_val_arr[1]} -m state --state NEW -j ACCEPT done done echo_done else echo_skipped fi # ------------- # ---- Allow extern IP-Address/Network # ------------- echononl "\t\tAllow extern IP-Address/Network" if [[ ${#allow_ext_net_arr[@]} -gt 0 ]] ; then for _dev in "${ext_if_arr[@]}" ; do for _net in "${allow_ext_net_arr[@]}" ; do $ip6t -A OUTPUT -o $_dev -p all -d $_net -m state --state NEW -j ACCEPT done done echo_done else echo_skipped fi echo # ------------- # ---- Allow (non-standard) local Services # ------------- echononl "\t\tAllow (non-standard) local Services" if [[ ${#allow_local_service_arr[@]} -gt 0 ]] ; then for _dev in "${ext_if_arr[@]}" ; do for _val in "${allow_local_service_arr[@]}" ; do IFS=':' read -a _val_arr <<< "${_val}" $ip6t -A INPUT -i $_dev -p ${_val_arr[1]} --dport ${_val_arr[0]} -m state --state NEW -j ACCEPT done done echo_done else echo_skipped fi echo # --- # - DHCP # --- echononl "\t\tDHCP" if [[ ${#dhcp_if_arr[@]} -gt 0 ]] ; then for _dev in ${dhcp_if_arr[@]} ; do # - in $ip6t -A INPUT -p udp -i $_dev -s 0/0 --sport 68 -d 255.255.255.255 --dport 67 -j ACCEPT # - out $ip6t -A OUTPUT -p udp -o $_dev --sport 67 -d 0/0 --dport 68 -j ACCEPT done echo_done else echo_skipped fi # --- # - DNS out only # --- echononl "\t\tDNS out only" # - Nameservers on the INET must be reachable for the local recursiv nameserver # - but also for all others # - for _dev in ${ext_if_arr[@]} ; do # - out from local and virtual mashine(s) $ip6t -A OUTPUT -o $_dev -p udp --dport 53 -m state --state NEW -j ACCEPT $ip6t -A OUTPUT -o $_dev -p tcp --dport 53 -m state --state NEW -j ACCEPT # - Only useful (needed) if kernel forwarding is activated (kernel_forward_between_interfaces=true) if $kernel_forward_between_interfaces ; then # - forward from virtual mashine(s) $ip6t -A FORWARD -o $_dev -p udp --dport 53 -m state --state NEW -j ACCEPT $ip6t -A FORWARD -o $_dev -p tcp --dport 53 -m state --state NEW -j ACCEPT fi done echo_done # --- # - DNS Service # --- echononl "\t\tDNS Service" if [[ ${#dns_server_ip_arr[@]} -gt 0 ]] || [[ ${#forward_dns_server_ip_arr[@]} -gt 0 ]] ; then if [[ ${#dns_server_ip_arr[@]} -gt 0 ]] ; then for _ip in ${dns_server_ips[@]} ; do # dns requests # # Note: # If the total size of the DNS record is larger than 512 bytes, # it will be sent over TCP, not UDP. # $ip6t -A INPUT -p udp -d $_ip --dport 53 -m state --state NEW -j ACCEPT $ip6t -A INPUT -p tcp -d $_ip --dport 53 -m state --state NEW -j ACCEPT # Zonetransfer $ip6t -A OUTPUT -p tcp -s $_ip --dport 53 -m state --state NEW -j ACCEPT done fi if [[ ${#forward_dns_server_ip_arr[@]} -gt 0 ]] && $kernel_forward_between_interfaces ; then for _ip in ${forward_dns_server_ip_arr[@]} ; do # dns requests # # Note: # If the total size of the DNS record is larger than 512 bytes, # it will be sent over TCP, not UDP. # $ip6t -A FORWARD -p udp -d $_ip --dport 53 -m state --state NEW -j ACCEPT $ip6t -A FORWARD -p tcp -d $_ip --dport 53 -m state --state NEW -j ACCEPT # Zonetransfer $ip6t -A FORWARD -p tcp -s $_ip --dport 53 -m state --state NEW -j ACCEPT done fi echo_done else echo_skipped fi # --- # - SSH out only # --- echononl "\t\tSSH out only" # ausgehende Anfragen for _dev in ${ext_if_arr[@]} ; do $ip6t -A OUTPUT -o $_dev -p tcp --dport 22 -m state --state NEW -j ACCEPT if $kernel_forward_between_interfaces ; then $ip6t -A FORWARD -o $_dev -p tcp --dport 22 -m state --state NEW -j ACCEPT fi done for _dev in ${local_if_arr[@]} ; do $ip6t -A OUTPUT -o $_dev -p tcp --dport 22 -m state --state NEW -j ACCEPT done echo_done # --- # - SSH Service # --- echononl "\t\tSSH Service" if [[ ${#ssh_server_ip_arr[@]} -gt 0 ]] || [[ ${#forward_ssh_server_ip_arr[@]} -gt 0 ]] ; then if [[ ${#ssh_server_ip_arr[@]} -gt 0 ]] ; then for _ip in ${ssh_server_ip_arr[@]} ; do for _port in ${ssh_port_arr[@]} ; do $ip6t -A INPUT -p tcp -d $_ip --dport $_port -m state --state NEW -j ACCEPT done done fi if [[ ${#forward_ssh_server_ip_arr[@]} -gt 0 ]] && $kernel_forward_between_interfaces ; then for _ip in ${forward_ssh_server_ip_arr[@]} ; do for _port in ${ssh_port_arr[@]} ; do $ip6t -A FORWARD -p tcp -d $_ip --dport $_port -m state --state NEW -j ACCEPT done done fi echo_done else echo_skipped fi # --- # - VPN # --- echononl "\t\tVPN Service only out" if [[ ${#vpn_port_arr[@]} -gt 0 ]] ; then for _dev in ${ext_if_arr[@]} ; do for _port in ${vpn_port_arr[@]} ; do $ip6t -A OUTPUT -o $_dev -p udp --dport $_port -m state --state NEW -j ACCEPT done done echo_done else echo_skipped fi echononl "\t\tVPN Services.." if [[ ${#vpn_server_ip_arr[@]} -gt 0 ]] || [[ ${#forward_vpn_server_ip_arr[@]} -gt 0 ]] ; then if [[ ${#vpn_server_ip_arr[@]} -gt 0 ]] ; then for _ip in ${vpn_server_ip_arr[@]} ; do for _port in ${vpn_port_arr[@]} ; do $ip6t -A INPUT -p udp -d $_ip --dport $_port -m state --state NEW -j ACCEPT done done fi if [[ ${#forward_vpn_server_ip_arr[@]} -gt 0 ]] && $kernel_forward_between_interfaces ; then for _ip in ${forward_vpn_server_ip_arr[@]} ; do $ip6t -A FORWARD -p udp -d $_ip --dport $_port -m state --state NEW -j ACCEPT done fi echo_done else echo_skipped fi # --- # - Rsync Out # --- echononl "\t\tRsync (only OUT)" if [[ ${#rsync_out_ip_arr[@]} -gt 0 ]] || [[ ${#forward_rsync_out_ip_arr[@]} -gt 0 ]] ; then if [[ ${#rsync_out_ip_arr[@]} -gt 0 ]] ; then for _port in ${rsync_port_arr[@]} ; do for _ip in ${rsync_out_ip_arr[@]} ; do $ip6t -A OUTPUT -p tcp -s $_ip --dport $_port -m state --state NEW -j ACCEPT done done fi if [[ ${#forward_rsync_out_ip_arr[@]} -gt 0 ]] && $kernel_forward_between_interfaces ; then for _port in ${rsync_port_arr[@]} ; do for _ip in ${forward_rsync_out_ip_arr[@]} ; do $ip6t -A FORWARD -p tcp -s $_ip --dport $_port -m state --state NEW -j ACCEPT done done fi echo_done else echo_skipped fi # --- # - Telnet # --- echononl "\t\tTelnet (only OUT)" for _dev in ${ext_if_arr[@]} ; do $ip6t -A OUTPUT -o $_dev -p tcp --dport 23 -m state --state NEW -j ACCEPT if $kernel_forward_between_interfaces ; then $ip6t -A FORWARD -o $_dev -p tcp --dport 23 -m state --state NEW -j ACCEPT fi done echo_done # --- # - MySQL # --- echononl "\t\tMySQL (only OUT)" for _dev in ${ext_if_arr[@]} ; do $ip6t -A OUTPUT -o $_dev -p tcp --dport 3306 -m state --state NEW -j ACCEPT if $kernel_forward_between_interfaces ; then $ip6t -A FORWARD -o $_dev -p tcp --dport 3306 -m state --state NEW -j ACCEPT fi done echo_done # --- # - Munin remote service # --- echononl "\t\tMunin remote service" if [ "X$munin_remote_ip" != "X" ]; then for _dev in ${ext_if_arr[@]} ; do $ip6t -A INPUT -i $_dev -p tcp --syn -s $munin_remote_ip --dport $munin_local_port -m state --state NEW -j ACCEPT if $kernel_forward_between_interfaces ; then $ip6t -A FORWARD -i $_dev -p tcp --syn -s $munin_remote_ip --dport $munin_local_port -m state --state NEW -j ACCEPT fi done echo_done else echo_skipped fi # --- # - Munin local service # --- echononl "\t\tMunin local service" if [[ ${#munin_server_ip_arr[@]} -gt 0 ]] || [[ ${#forward_munin_server_ip_arr[@]} -gt 0 ]] ; then if [[ ${#munin_server_ip_arr[@]} -gt 0 ]] ; then for _ip in ${munin_server_ip_arr[@]} ; do $ip6t -A OUTPUT -p tcp --syn -s $_ip --dport $munin_remote_port -m state --state NEW -j ACCEPT done fi if [[ ${#forward_munin_server_ip_arr[@]} -gt 0 ]] && $kernel_forward_between_interfaces ; then for _ip in ${forward_munin_server_ip_arr[@]} ; do $ip6t -A FORWARD -p tcp --syn -s $_ip --dport $munin_remote_port -m state --state NEW -j ACCEPT done fi echo_done else echo_skipped fi # --- # - Mail (SMTP OUT) # --- echononl "\t\tMail (SMTP OUT)" for _dev in ${ext_if_arr[@]} ; do $ip6t -A OUTPUT -o $_dev -p tcp --dport 25 -m state --state NEW -j ACCEPT if $kernel_forward_between_interfaces ; then $ip6t -A FORWARD -o $_dev -p tcp --dport 25 -m state --state NEW -j ACCEPT fi done echo_done # --- # - Mail SMTP Server (Port 25) including Spam Control # --- echononl "\t\tMail SMTP Server (Port 25) including Spam Control" if [[ ${#smtpd_ips_arr[@]} -gt 0 ]] || [[ ${#forward_smtpd_ip_arr[@]} -gt 0 ]] ; then if [[ ${#smtpd_ips_arr[@]} > 0 ]] ; then for _ip in ${smtpd_ips_arr[@]} ; do $ip6t -A INPUT -p tcp -d $_ip --dport 25 -m state --state NEW -j ACCEPT # # Razor2 (TCP Port 2703) $ip6t -A OUTPUT -p tcp -s $_ip --dport 2703 -m state --state NEW -j ACCEPT # DEPRECATED: TCP Port 7 (echo) $ip6t -A OUTPUT -p tcp -s $_ip --dport 7 -m state --state NEW -j ACCEPT # # Pyzor (UDP Port 24441 or TCP Port 24441 or both ?) $ip6t -A OUTPUT -p udp -s $_ip --dport 24441 -m state --state NEW -j ACCEPT $ip6t -A OUTPUT -p tcp -s $_ip --dport 24441 -m state --state NEW -j ACCEPT # # - DCC (port udp:6277) $ip6t -A OUTPUT -s $_ip -p udp -m udp --dport 6277 -m state --state NEW -j ACCEPT # if DCC Server is running (port tcp:6277) $ip6t -A INPUT -p tcp -d $_ip --dport 6277 -j ACCEPT $ip6t -A OUTPUT -p tcp -s $_ip --dport 6277 -j ACCEPT done fi if [[ ${#forward_smtpd_ip_arr[@]} -gt 0 ]] && $kernel_forward_between_interfaces ; then for _ip in ${forward_smtpd_ip_arr[@]} ; do $ip6t -A FORWARD -p tcp -d $_ip --dport 25 -m state --state NEW -j ACCEPT # # Razor2 (TCP Port 2703) $ip6t -A FORWARD -p tcp -s $_ip --dport 2703 -m state --state NEW -j ACCEPT # DEPRECATED: TCP Port 7 (echo) $ip6t -A FORWARD -p tcp -s $_ip --dport 7 -m state --state NEW -j ACCEPT # # Pyzor (UDP Port 24441 or TCP Port 24441 or both ?) $ip6t -A FORWARD -p udp -s $_ip --dport 24441 -m state --state NEW -j ACCEPT $ip6t -A FORWARD -p tcp -s $_ip --dport 24441 -m state --state NEW -j ACCEPT # # DCC (port udp:6277) $ip6t -A FORWARD -s $_ip -p udp -m udp --dport 6277 -m state --state NEW -j ACCEPT # if DCC Server is running (port tcp:6277) $ip6t -A FORWARD -p tcp -d $_ip --dport 6277 -j ACCEPT $ip6t -A FORWARD -p tcp -s $_ip --dport 6277 -j ACCEPT done fi echo_done else echo_skipped fi # --- # - Mailservice (Submission/SMTPS/POP/IMAP Server) # --- echononl "\t\tMailservice (Submission/SMTPS/POP/IMAP Server)" if [[ ${#mail_server_ips_arr[@]} -gt 0 ]] || [[ ${#forward_mail_server_ip_arr[@]} -gt 0 ]] ; then if [[ ${#mail_server_ips_arr[@]} -gt 0 ]] ; then for _ip in ${mail_server_ips_arr[@]} ; do # mail ports # $ip6t -A INPUT -p tcp -d $_ip -m multiport --dports $mail_user_ports -m state --state NEW -j ACCEPT done fi # if [[ ${#mail_server_ips_arr[@]} -gt 0 ]] if [[ ${#forward_mail_server_ip_arr[@]} -gt 0 ]] && $kernel_forward_between_interfaces ; then for _ip in ${forward_mail_server_ip_arr[@]} ; do # mail ports # $ip6t -A FORWARD -p tcp -d $_ip -m multiport --dports $mail_user_ports -m state --state NEW -j ACCEPT done fi # if [[ ${#forward_mail_server_ip_arr[@]} -gt 0 ]] ; then echo_done else echo_skipped fi # --- # - Mail Client (Submission/SMTPS/POPS/IMAPS) out only # --- echononl "\t\tMail Client (Submission/SMTPS/POPS/IMAPS) out only" if [[ ${#mail_client_ips_arr[@]} -gt 0 ]] || [[ ${#forward_mail_client_ip_arr[@]} -gt 0 ]] ; then if [[ ${#mail_client_ips_arr[@]} -gt 0 ]] ; then for _ip in ${mail_client_ips_arr[@]} ; do # mail ports # $ip6t -A OUTPUT -p tcp -s $_ip -m multiport --dports $mail_user_ports -m state --state NEW -j ACCEPT done fi # if [[ ${#mail_client_ips_arr[@]} -gt 0 ]] if [[ ${#forward_mail_client_ip_arr[@]} -gt 0 ]] && $kernel_forward_between_interfaces ; then for _ip in ${forward_mail_client_ip_arr[@]} ; do # mail ports # $ip6t -A FORWARD -p tcp -s $_ip -m multiport --dports $mail_user_ports -m state --state NEW -j ACCEPT done fi # if [[ ${#forward_mail_client_ip_arr[@]} -gt 0 ]] ; then echo_done else echo_skipped fi # --- # - HTTP(S) OUT # --- echononl "\t\tHTTP(S) out only" for _dev in ${ext_if_arr[@]} ; do $ip6t -A OUTPUT -o $_dev -p tcp -m multiport --dports $http_ports -m state --state NEW -j ACCEPT if $kernel_forward_between_interfaces ; then $ip6t -A FORWARD -o $_dev -p tcp -m multiport --dports $http_ports -m state --state NEW -j ACCEPT fi done echo_done # --- # - HTTP(S) (local) Webserver # --- echononl "\t\tHTTP(S) (local) Webserver" if [[ ${#http_server_ip_arr[@]} -gt 0 ]] || [[ ${#forward_http_server_ip_arr[@]} -gt 0 ]] ; then if [[ ${#http_server_ip_arr[@]} -gt 0 ]] ; then for _ip in ${http_server_ip_arr[@]} ; do $ip6t -A INPUT -p tcp -d $_ip -m multiport --dports $http_ports -m state --state NEW -j ACCEPT done if [[ ${#forward_http_server_ip_arr[@]} -gt 0 ]] && $kernel_forward_between_interfaces ; then for _ip in ${forward_http_server_ip_arr[@]} ; do $ip6t -A FORWARD -p tcp -d $_ip -m multiport --dports $http_ports -m state --state NEW -j ACCEPT done fi fi echo_done else echo_skipped fi # --- # - FTP out only" # --- echononl "\t\tFTP out only (using CT target)" # - (Re)define helper # - $ip6t -A OUTPUT -t raw -p tcp --dport 21 -j CT --helper ftp # - Used for different ftpdata recent lists 'ftp6data_out_$j' # - declare -i j=1 for _dev in ${ext_if_arr[@]} ; do # - (1) # - # - Open FTP connection and add the destination ip (--rdest) to ftpdata recent list 'ftpdata_out_$j'. # - $ip6t -A OUTPUT -o $_dev -p tcp --dport 21 -m state --state NEW \ -m recent --name ftp6data_out_$j --rdest --set -j ACCEPT # - (2) # - - Accept packets if the destination ip-address (--rdest) is in the 'ftpdata_$i' list (--update) # - and the destination ip-address was seen within the last 1800 seconds (--seconds 1800). # - # - - If matched, the "last seen" timestamp of the destination address will be updated (--update). # - # - - Entries in the ftpdata list not seen in the last 1800 will be removed (--reap). # - $ip6t -A OUTPUT -o $_dev -p tcp -m state --state NEW --dport 1024: \ -m recent --name ftp6data_out_$j --rdest --update --seconds 1800 --reap -j ACCEPT ((j++)) # - Accept (helper ftp) related connections # - $ip6t -A OUTPUT -m conntrack --ctstate RELATED -m helper --helper ftp -o $_dev -p tcp --dport 1024: -j ACCEPT done echo_done #echononl "\t\tFTP out only" # #for _dev in ${ext_if_arr[@]} ; do # # (Datenkanal aktiv) # $ip6t -A INPUT -i $_dev -p tcp --sport 20 -m state --state NEW -j ACCEPT # # (Datenkanal passiv) # $ip6t -A OUTPUT -o $_dev -p tcp --sport $unprivports --dport $unprivports -m state --state NEW -j ACCEPT # # (Kontrollverbindung) # $ip6t -A OUTPUT -o $_dev -p tcp --dport 21 -m state --state NEW -j ACCEPT # if $kernel_forward_between_interfaces ; then # # (Datenkanal aktiv) # $ip6t -A FORWARD -i $_dev -p tcp --sport 20 -m state --state NEW -j ACCEPT # # (Datenkanal passiv) # $ip6t -A FORWARD -o $_dev -p tcp --sport $unprivports --dport $unprivports -m state --state NEW -j ACCEPT # # (Kontrollverbindung) # $ip6t -A FORWARD -o $_dev -p tcp --dport 21 -m state --state NEW -j ACCEPT # fi #done # #echo_done # --- # - FTP Server" # --- echononl "\t\tFTP Server (using CT target)" if [[ ${#ftp_server_ip_arr[@]} -gt 0 ]] || [[ ${#forward_ftp_server_ip_arr[@]} -gt 0 ]] ; then # - Used for different ftpdata recent lists 'ftpdata_$i' # - declare -i i=1 # - (Re)define helper # - # - !! Note: !! # - for both, local FTP server (ftp_server_ip_arr) # - and forward to FTP server (forward_ftp_server_ip_arr) # - $ip6t -A PREROUTING -t raw -p tcp --dport 21 -j CT --helper ftp if [[ ${#ftp_server_ip_arr[@]} -gt 0 ]] ; then for _ip in ${ftp_server_ip_arr[@]} ; do # ===== # - # - ip_conntrack_ftp cannot see the TLS-encrypted traffic # - ====================================================== # - # - Workaround: # - (1) add source ip to a 'recent list' named 'ftpdata_$i! if ftp control connections appear # - (2) accept packets of the formaly created recent list 'ftpdata_$i! # - # ===== # - (1) # - # - Accept initial FTP connection and add the source ip to ftpdata recent list 'ftpdata_$i'. # - $ip6t -A INPUT -p tcp -m state --state NEW -d $_ip --dport 21 -m recent --name ftpdata_$i --set -j ACCEPT # - (2) # - - Accept packets if the source ip-address is in the 'ftpdata_$i' list (--update) and the # - source ip-address was seen within the last 1800 seconds (--seconds 1800). # - # - - If matched, the "last seen" timestamp of the source address will be updated (--update). # - # - - Entries in the ftpdata list not seen in the last 1800 will be removed (--reap). # - $ip6t -A INPUT -p tcp -m state --state NEW --sport 1024: -d $_ip --dport $ftp_passive_port_range \ -m recent --name ftpdata_$i --update --seconds 1800 --reap -j ACCEPT # - Accept (helper ftp) related connections # - $ip6t -A INPUT -m conntrack --ctstate RELATED -m helper --helper ftp -d $_ip -p tcp --dport 1024: -j ACCEPT ((i++)) done fi if [[ ${#forward_ftp_server_ip_arr[@]} -gt 0 ]] && $kernel_forward_between_interfaces ; then for _ip in ${forward_ftp_server_ip_arr[@]} ; do # ===== # - # - ip_conntrack_ftp cannot see the TLS-encrypted traffic # - ====================================================== # - # - Workaround: # - (1) add source ip to a 'recent list' named 'ftpdata_$i! if ftp control connections appear # - (2) accept packets of the formaly created recent list 'ftpdata_$i! # - # ===== # - (1) # - # - Accept initial FTP connection and add the source ip to ftpdata recent list 'ftpdata_$i'. # - $ip6t -A FORWARD -p tcp -m state --state NEW -d $_ip --dport 21 -m recent --name ftpdata_$i --set -j ACCEPT # - (2) # - - Accept packets if the source ip-address is in the 'ftpdata_$i' list (--update) and the # - source ip-address was seen within the last 1800 seconds (--seconds 1800). # - # - - If matched, the "last seen" timestamp of the source address will be updated (--update). # - # - - Entries in the ftpdata list not seen in the last 1800 will be removed (--reap). # - $ip6t -A FORWARD -p tcp -m state --state NEW --sport 1024: -d $_ip --dport $ftp_passive_port_range \ -m recent --name ftpdata_$i --update --seconds 1800 --reap -j ACCEPT $ip6t -A FORWARD -p tcp -m state --state NEW --dport 1024: -s $_ip --sport $ftp_passive_port_range \ -m recent --name ftpdata_$i --update --seconds 1800 --reap -j ACCEPT # - Accept (helper ftp) related connections # - $ip6t -A FORWARD -m conntrack --ctstate RELATED -m helper --helper ftp -d $_ip -p tcp --dport 1024: -j ACCEPT $ip6t -A FORWARD -m conntrack --ctstate RELATED -m helper --helper ftp -s $_ip -p tcp --sport 1024: -j ACCEPT ((i++)) done fi echo_done else echo_skipped fi #echononl "\t\tFTP Server" # #if [[ ${#ftp_server_ip_arr[@]} -gt 0 ]] || [[ ${#forward_ftp_server_ip_arr[@]} -gt 0 ]] ; then # if [[ ${#ftp_server_ip_arr[@]} -gt 0 ]] ; then # for _ip in ${ftp_server_ip_arr[@]} ; do # # (Datenkanal aktiv) # $ip6t -A OUTPUT -p tcp -s $_ip --sport 20 -m state --state NEW -j ACCEPT # # Datenkanal (passiver modus) # $ip6t -A INPUT -p tcp -d $_ip --dport $unprivports --sport $unprivports -m state --state NEW -j ACCEPT # # - Kontrollverbindung # $ip6t -A INPUT -p tcp -d $_ip --dport 21 --sport $unprivports -m state --state NEW -j ACCEPT # done # fi # # if [[ ${#forward_ftp_server_ip_arr[@]} -gt 0 ]] && $kernel_forward_between_interfaces ; then # for _ip in ${forward_ftp_server_ip_arr[@]} ; do # # (Datenkanal aktiv) # $ip6t -A FORWARD -p tcp -s $_ip --sport 20 -m state --state NEW -j ACCEPT # # Datenkanal (passiver modus) # $ip6t -A FORWARD -p tcp -d $_ip --dport $unprivports --sport $unprivports -m state --state NEW -j ACCEPT # # - Kontrollverbindung # $ip6t -A FORWARD -p tcp -d $_ip --dport 21 --sport $unprivports -m state --state NEW -j ACCEPT # done # fi # # echo_done #else # echo_skipped #fi # --- # - Mumble Service # --- echononl "\t\tMumble Service" if [[ ${#mumble_server_ip_arr[@]} -gt 0 ]] || $local_mumble_service ; then if [[ ${#mumble_server_ip_arr[@]} -gt 0 ]] ; then for _ip in ${mumble_server_ip_arr[@]} ; do $ip6t -A INPUT -p tcp -d $_ip -m multiport --dports $mumble_ports -m state --state NEW -j ACCEPT $ip6t -A INPUT -p udp -d $_ip -m multiport --dports $mumble_ports -m state --state NEW -j ACCEPT done fi if [[ ${#forward_mumble_server_ip_arr[@]} ]] && $kernel_forward_between_interfaces ; then for _ip in ${forward_mumble_server_ip_arr[@]} ; do $ip6t -A FORWARD -p tcp -d $_ip -m multiport --dports $mumble_ports -m state --state NEW -j ACCEPT $ip6t -A FORWARD -p udp -d $_ip -m multiport --dports $mumble_ports -m state --state NEW -j ACCEPT done fi echo_done else echo_skipped fi # --- # - Timeserver (Port 37 NOT NTP!)" # --- echononl "\t\tTimeserver (Port 37 NOT NTP!) out only" for _dev in ${ext_if_arr[@]} ; do $ip6t -A OUTPUT -o $_dev -p tcp --dport 37 -m state --state NEW -j ACCEPT if $kernel_forward_between_interfaces ; then $ip6t -A FORWARD -o $_dev -p tcp --dport 37 -m state --state NEW -j ACCEPT fi done echo_done # --- # - NTP out only" # --- echononl "\t\tNTP out only" for _dev in ${ext_if_arr[@]} ; do $ip6t -A OUTPUT -o $_dev -p tcp --dport 123 -m state --state NEW -j ACCEPT $ip6t -A OUTPUT -o $_dev -p udp --dport 123 -m state --state NEW -j ACCEPT if $kernel_forward_between_interfaces ; then $ip6t -A FORWARD -o $_dev -p tcp --dport 123 -m state --state NEW -j ACCEPT $ip6t -A FORWARD -o $_dev -p udp --dport 123 -m state --state NEW -j ACCEPT fi done echo_done # --- # - Whois out only # --- echononl "\t\tWhois out only" for _dev in ${ext_if_arr[@]} ; do $ip6t -A OUTPUT -o $_dev -p tcp --dport 43 -m state --state NEW -j ACCEPT if $kernel_forward_between_interfaces ; then $ip6t -A FORWARD -o $_dev -p tcp --dport 43 -m state --state NEW -j ACCEPT fi done echo_done echo # --- # - Special TCP Ports OUT # --- echononl "\t\tSpecial TCP Ports OUT" if [[ ${#tcp_out_port_arr[@]} -gt 0 ]] || [[ ${#forward_tcp_out_port_arr[@]} -gt 0 ]] ; then if [[ ${#forward_tcp_out_port_arr[@]} -gt 0 ]] ; then for _dev in ${ext_if_arr[@]} ; do for _port in ${tcp_out_port_arr[@]} ; do $ip6t -A OUTPUT -o $_dev -p tcp --dport $_port -m state --state NEW -j ACCEPT done done fi if [[ ${#forward_tcp_out_port_arr[@]} -gt 0 ]] && $kernel_forward_between_interfaces ; then for _dev in ${ext_if_arr[@]} ; do for _port in ${tcp_out_port_arr[@]} ; do $ip6t -A FORWARD -o $_dev -p tcp --dport $_port -m state --state NEW -j ACCEPT done done fi echo_done else echo_skipped fi # --- # - Special UDP Ports OUT # --- echononl "\t\tSpecial UDP Ports OUT" if [[ ${#udp_out_port_arr[@]} -gt 0 ]] || [[ ${#forward_udp_out_port_arr[@]} -gt 0 ]] ; then if [[ ${#udp_out_port_arr[@]} -gt 0 ]] ; then for _dev in ${ext_if_arr[@]} ; do for _port in ${udp_out_port_arr[@]} ; do $ip6t -A OUTPUT -o $_dev -p udp --dport $_port -m state --state NEW -j ACCEPT done done fi if [[ ${#forward_udp_out_port_arr[@]} -gt 0 ]] ; then for _dev in ${ext_if_arr[@]} ; do for _port in ${forward_udp_out_port_arr[@]} ; do $ip6t -A FORWARD -o $_dev -p udp --dport $_port -m state --state NEW -j ACCEPT done done fi echo_done else echo_skipped fi echo # --- # - UNIX Traceroute # --- echononl "\t\tUNIX Traceroute" # versendet udp packete im gegensatz zu tracert von windows # der icmp-echo-request pakete versendet # einige implementierungen von traceroute (linux) erm�lichens # die option -I und versenden dann ebenfalls icmp-echo-request pakete for _dev in ${ext_if_arr[@]} ; do $ip6t -A OUTPUT -o $_dev -p udp -m state --state NEW --dport 33434:33530 -j ACCEPT $ip6t -A INPUT -i $_dev -p udp -m state --state NEW --dport 33434:33530 -j ACCEPT if $kernel_forward_between_interfaces ; then $ip6t -A FORWARD -o $_dev -p udp -m state --state NEW --dport 33434:33530 -j ACCEPT $ip6t -A FORWARD -i $_dev -p udp -m state --state NEW --dport 33434:33530 -j ACCEPT fi done echo_done # --- # - Ping # --- echononl "\t\tPing" $ip6t -A INPUT -p ipv6-icmp -j ACCEPT $ip6t -A OUTPUT -p ipv6-icmp -j ACCEPT if $kernel_forward_between_interfaces ; then $ip6t -A FORWARD -p ipv6-icmp -j ACCEPT fi #for _dev in ${ext_if_arr[@]} ; do # $ip6t -A INPUT -i $_dev -p ipv6-icmp -j ACCEPT # $ip6t -A OUTPUT -o $_dev -p ipv6-icmp -j ACCEPT # if $kernel_forward_between_interfaces ; then # $ip6t -A FORWARD -i $_dev -p ipv6-icmp -j ACCEPT # $ip6t -A FORWARD -o $_dev -p ipv6-icmp -j ACCEPT # fi #done #for _dev in ${local_if_arr[@]} ; do # $ip6t -A INPUT -i $_dev -p ipv6-icmp -j ACCEPT # $ip6t -A OUTPUT -o $_dev -p ipv6-icmp -j ACCEPT # if $kernel_forward_between_interfaces ; then # $ip6t -A FORWARD -i $_dev -p ipv6-icmp -j ACCEPT # $ip6t -A FORWARD -o $_dev -p ipv6-icmp -j ACCEPT # fi #done echo_done # --- # - log all rejected traffic # --- echo echononl "\tLogging all rejected traffic" if $log_rejected || $log_all ; then #$ip6t -A OUTPUT -j LOG --log-prefix "$log_prefix Rejected: " --log-level $log_level #$ip6t -A INPUT -j LOG --log-prefix "$log_prefix Rejected: " --log-level $log_level #$ip6t -A FORWARD -j LOG --log-prefix "$log_prefix Rejected: " --log-level $log_level $ip6t -A OUTPUT -m limit --limit-burst 5 -j LOG --log-prefix "$log_prefix Rejected: " --log-level $log_level $ip6t -A INPUT -m limit --limit-burst 5 -j LOG --log-prefix "$log_prefix Rejected: " --log-level $log_level if $kernel_forward_between_interfaces ; then #$ip6t -A FORWARD -j LOG --log-prefix "$log_prefix Rejected: " --log-level $log_level $ip6t -A FORWARD -m limit --limit-burst 5 -j LOG --log-prefix "$log_prefix Rejected: " --log-level $log_level fi echo_done else echo_skipped fi # --- # - Drop all other # --- echo echononl "\tDrop all other on all interfaces" $ip6t -A INPUT -j DROP $ip6t -A OUTPUT -j DROP $ip6t -A FORWARD -j DROP echo_done # ------------- # ------------- Start Fail2Ban if installed # ------------- if [ -x "$fail2ban_client" ]; then echo echononl "\tStarting fail2ban.." $fail2ban_client start > /dev/null 2>&1 if [ "$?" = "0" ];then echo_done else echo_failed fi fi echo exit 0