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Basic iptables template for ordinary servers (both IPv4 and IPv6)
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| ############################################################################### | |
| # The MIT License | |
| # | |
| # Copyright 2012-2014 Jakub Jirutka <jakub@jirutka.cz>. | |
| # | |
| # Permission is hereby granted, free of charge, to any person obtaining a copy | |
| # of this software and associated documentation files (the "Software"), to deal | |
| # in the Software without restriction, including without limitation the rights | |
| # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
| # copies of the Software, and to permit persons to whom the Software is | |
| # furnished to do so, subject to the following conditions: | |
| # | |
| # The above copyright notice and this permission notice shall be included in | |
| # all copies or substantial portions of the Software. | |
| # | |
| # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
| # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
| # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
| # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
| # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
| # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
| # THE SOFTWARE. | |
| # | |
| ############################################################################### | |
| # | |
| # Basic ip(6)tables (both IPv4 and IPv6) template for an ordinary servers | |
| # | |
| # This file is in iptables-restore (ip6tables-restore) format. See the man | |
| # pages for iptables-restore (ip6tables-restore). Rules that should be loaded | |
| # only by iptables (ip6tables) uses the -4 (-6) option. | |
| # | |
| # The following is a set of firewall rules that should be applicable to Linux | |
| # servers running within departments. It is intended to provide a useful | |
| # starting point from which to devise a comprehensive firewall policy for | |
| # a host. | |
| # | |
| # Parts 1 and 3 of these rules are the same for each host, whilst part 2 can be | |
| # populated with rules specific to particular hosts. The optional part 4 is | |
| # prepared for a NAT rules, e.g. for port forwarding, redirect, masquerade... | |
| # | |
| # This template is based on http://jdem.cz/v64a3 from University of Leicester | |
| # | |
| # For the newest version go to https://gist.github.com/jirutka/3742890. | |
| # | |
| # @author Jakub Jirutka <jakub@jirutka.cz> | |
| # @version 1.3.1 | |
| # @date 2014-01-28 | |
| # | |
| ############################################################################### | |
| # 1. COMMON HEADER # | |
| # # | |
| # This section is a generic header that should be suitable for most hosts. # | |
| ############################################################################### | |
| *filter | |
| # Base policy | |
| :INPUT DROP [0:0] | |
| :FORWARD DROP [0:0] | |
| :OUTPUT ACCEPT [0:0] | |
| # Don't attempt to firewall internal traffic on the loopback device. | |
| -A INPUT -i lo -j ACCEPT | |
| # Continue connections that are already established or related to an established | |
| # connection. | |
| -A INPUT -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT | |
| # Drop non-conforming packets, such as malformed headers, etc. | |
| -A INPUT -m conntrack --ctstate INVALID -j DROP | |
| # Block remote packets claiming to be from a loopback address. | |
| -4 -A INPUT -s 127.0.0.0/8 ! -i lo -j DROP | |
| -6 -A INPUT -s ::1/128 ! -i lo -j DROP | |
| # Drop all packets that are going to broadcast, multicast or anycast address. | |
| -4 -A INPUT -m addrtype --dst-type BROADCAST -j DROP | |
| -4 -A INPUT -m addrtype --dst-type MULTICAST -j DROP | |
| -4 -A INPUT -m addrtype --dst-type ANYCAST -j DROP | |
| -4 -A INPUT -d 224.0.0.0/4 -j DROP | |
| # Chain for preventing SSH brute-force attacks. | |
| # Permits 10 new connections within 5 minutes from a single host then drops | |
| # incomming connections from that host. Beyond a burst of 100 connections we | |
| # log at up 1 attempt per second to prevent filling of logs. | |
| -N SSHBRUTE | |
| -A SSHBRUTE -m recent --name SSH --set | |
| -A SSHBRUTE -m recent --name SSH --update --seconds 300 --hitcount 10 -m limit --limit 1/second --limit-burst 100 -j LOG --log-prefix "iptables[SSH-brute]: " | |
| -A SSHBRUTE -m recent --name SSH --update --seconds 300 --hitcount 10 -j DROP | |
| -A SSHBRUTE -j ACCEPT | |
| # Chain for preventing ping flooding - up to 6 pings per second from a single | |
| # source, again with log limiting. Also prevents us from ICMP REPLY flooding | |
| # some victim when replying to ICMP ECHO from a spoofed source. | |
| -N ICMPFLOOD | |
| -A ICMPFLOOD -m recent --set --name ICMP --rsource | |
| -A ICMPFLOOD -m recent --update --seconds 1 --hitcount 6 --name ICMP --rsource --rttl -m limit --limit 1/sec --limit-burst 1 -j LOG --log-prefix "iptables[ICMP-flood]: " | |
| -A ICMPFLOOD -m recent --update --seconds 1 --hitcount 6 --name ICMP --rsource --rttl -j DROP | |
| -A ICMPFLOOD -j ACCEPT | |
| ############################################################################### | |
| # 2. HOST SPECIFIC RULES # | |
| # # | |
| # This section is a good place to enable your host-specific services. # | |
| ############################################################################### | |
| # Accept HTTP and HTTPS | |
| #-A INPUT -p tcp -m multiport --dports 80,443 --syn -m conntrack --ctstate NEW -j ACCEPT | |
| # Accept FTP only for IPv4 | |
| #-4 -A INPUT -p tcp --dport 21 --syn -m conntrack --ctstate NEW -j ACCEPT | |
| ############################################################################### | |
| # 3. GENERAL RULES # | |
| # # | |
| # This section contains general rules that should be suitable for most hosts. # | |
| ############################################################################### | |
| # Accept worldwide access to SSH and use SSHBRUTE chain for preventing | |
| # brute-force attacks. | |
| -A INPUT -p tcp --dport 22 --syn -m conntrack --ctstate NEW -j SSHBRUTE | |
| # Permit useful IMCP packet types for IPv4 | |
| # Note: RFC 792 states that all hosts MUST respond to ICMP ECHO requests. | |
| # Blocking these can make diagnosing of even simple faults much more tricky. | |
| # Real security lies in locking down and hardening all services, not by hiding. | |
| -4 -A INPUT -p icmp --icmp-type 0 -m conntrack --ctstate NEW -j ACCEPT | |
| -4 -A INPUT -p icmp --icmp-type 3 -m conntrack --ctstate NEW -j ACCEPT | |
| -4 -A INPUT -p icmp --icmp-type 11 -m conntrack --ctstate NEW -j ACCEPT | |
| # Permit needed ICMP packet types for IPv6 per RFC 4890. | |
| -6 -A INPUT -p ipv6-icmp --icmpv6-type 1 -j ACCEPT | |
| -6 -A INPUT -p ipv6-icmp --icmpv6-type 2 -j ACCEPT | |
| -6 -A INPUT -p ipv6-icmp --icmpv6-type 3 -j ACCEPT | |
| -6 -A INPUT -p ipv6-icmp --icmpv6-type 4 -j ACCEPT | |
| -6 -A INPUT -p ipv6-icmp --icmpv6-type 133 -j ACCEPT | |
| -6 -A INPUT -p ipv6-icmp --icmpv6-type 134 -j ACCEPT | |
| -6 -A INPUT -p ipv6-icmp --icmpv6-type 135 -j ACCEPT | |
| -6 -A INPUT -p ipv6-icmp --icmpv6-type 136 -j ACCEPT | |
| -6 -A INPUT -p ipv6-icmp --icmpv6-type 137 -j ACCEPT | |
| -6 -A INPUT -p ipv6-icmp --icmpv6-type 141 -j ACCEPT | |
| -6 -A INPUT -p ipv6-icmp --icmpv6-type 142 -j ACCEPT | |
| -6 -A INPUT -s fe80::/10 -p ipv6-icmp --icmpv6-type 130 -j ACCEPT | |
| -6 -A INPUT -s fe80::/10 -p ipv6-icmp --icmpv6-type 131 -j ACCEPT | |
| -6 -A INPUT -s fe80::/10 -p ipv6-icmp --icmpv6-type 132 -j ACCEPT | |
| -6 -A INPUT -s fe80::/10 -p ipv6-icmp --icmpv6-type 143 -j ACCEPT | |
| -6 -A INPUT -p ipv6-icmp --icmpv6-type 148 -j ACCEPT | |
| -6 -A INPUT -p ipv6-icmp --icmpv6-type 149 -j ACCEPT | |
| -6 -A INPUT -s fe80::/10 -p ipv6-icmp --icmpv6-type 151 -j ACCEPT | |
| -6 -A INPUT -s fe80::/10 -p ipv6-icmp --icmpv6-type 152 -j ACCEPT | |
| -6 -A INPUT -s fe80::/10 -p ipv6-icmp --icmpv6-type 153 -j ACCEPT | |
| # Permit IMCP echo requests (ping) and use ICMPFLOOD chain for preventing ping | |
| # flooding. | |
| -4 -A INPUT -p icmp --icmp-type 8 -m conntrack --ctstate NEW -j ICMPFLOOD | |
| -6 -A INPUT -p ipv6-icmp --icmpv6-type 128 -j ICMPFLOOD | |
| # Do not log packets that are going to ports used by SMB | |
| # (Samba / Windows Sharing). | |
| -A INPUT -p udp -m multiport --dports 135,445 -j DROP | |
| -A INPUT -p udp --dport 137:139 -j DROP | |
| -A INPUT -p udp --sport 137 --dport 1024:65535 -j DROP | |
| -A INPUT -p tcp -m multiport --dports 135,139,445 -j DROP | |
| # Do not log packets that are going to port used by UPnP protocol. | |
| -A INPUT -p udp --dport 1900 -j DROP | |
| # Do not log late replies from nameservers. | |
| -A INPUT -p udp --sport 53 -j DROP | |
| # Good practise is to explicately reject AUTH traffic so that it fails fast. | |
| -A INPUT -p tcp --dport 113 --syn -m conntrack --ctstate NEW -j REJECT --reject-with tcp-reset | |
| # Prevent DOS by filling log files. | |
| -A INPUT -m limit --limit 1/second --limit-burst 100 -j LOG --log-prefix "iptables[DOS]: " | |
| COMMIT | |
| ############################################################################### | |
| # 4. HOST SPECIFIC NAT RULES # | |
| # # | |
| # Uncomment this section if you want to use NAT table, e.g. for port # | |
| # forwarding, redirect, masquerade... If you want to load this section only # | |
| # for IPv4 and ignore for IPv6, use ip6tables-restore with -T filter. # | |
| ############################################################################### | |
| #*nat | |
| # Base policy | |
| #:PREROUTING ACCEPT [0:0] | |
| #:POSTROUTING ACCEPT [0:0] | |
| #:OUTPUT ACCEPT [0:0] | |
| # Redirect port 21 to local port 2121 | |
| #-A PREROUTING -i eth0 -p tcp --dport 21 -j REDIRECT --to-port 2121 | |
| # Forward port 8080 to port 80 on host 192.168.1.10 | |
| #-4 -A PREROUTING -i eth0 -p tcp --dport 8080 -j DNAT --to-destination 192.168.1.10:80 | |
| #COMMIT |
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| ############################################################################### | |
| # The MIT License | |
| # | |
| # Copyright 2012-2014 Jakub Jirutka <jakub@jirutka.cz>. | |
| # | |
| # Permission is hereby granted, free of charge, to any person obtaining a copy | |
| # of this software and associated documentation files (the "Software"), to deal | |
| # in the Software without restriction, including without limitation the rights | |
| # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
| # copies of the Software, and to permit persons to whom the Software is | |
| # furnished to do so, subject to the following conditions: | |
| # | |
| # The above copyright notice and this permission notice shall be included in | |
| # all copies or substantial portions of the Software. | |
| # | |
| # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
| # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
| # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
| # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
| # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
| # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
| # THE SOFTWARE. | |
| # | |
| ############################################################################### | |
| # | |
| # Basic iptables/IPv4 template for an ordinary servers | |
| # | |
| # This file is in iptables-restore format. See the man pages for | |
| # iptables-restore(8) and iptables-save(8). | |
| # | |
| # The following is a set of firewall rules that should be applicable to Linux | |
| # servers running within departments. It is intended to provide a useful | |
| # starting point from which to devise a comprehensive firewall policy for | |
| # a host. | |
| # | |
| # Parts 1 and 3 of these rules are the same for each host, whilst part 2 can be | |
| # populated with rules specific to particular hosts. The optional part 4 is | |
| # prepared for a NAT rules, e.g. for port forwarding, redirect, masquerade... | |
| # | |
| # This template is based on http://jdem.cz/v64a3 from University of Leicester. | |
| # | |
| # For the newest version go to https://gist.github.com/jirutka/3742890. | |
| # | |
| # @author Jakub Jirutka <jakub@jirutka.cz> | |
| # @version 1.3.1 | |
| # @date 2014-01-28 | |
| # | |
| ############################################################################### | |
| # 1. COMMON HEADER # | |
| # # | |
| # This section is a generic header that should be suitable for most hosts. # | |
| ############################################################################### | |
| *filter | |
| # Base policy | |
| :INPUT DROP [0:0] | |
| :FORWARD DROP [0:0] | |
| :OUTPUT ACCEPT [0:0] | |
| # Don't attempt to firewall internal traffic on the loopback device. | |
| -A INPUT -i lo -j ACCEPT | |
| # Continue connections that are already established or related to an established | |
| # connection. | |
| -A INPUT -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT | |
| # Drop non-conforming packets, such as malformed headers, etc. | |
| -A INPUT -m conntrack --ctstate INVALID -j DROP | |
| # Block remote packets claiming to be from a loopback address. | |
| -A INPUT -s 127.0.0.0/8 ! -i lo -j DROP | |
| # Drop all packets that are going to broadcast, multicast or anycast address. | |
| -A INPUT -m addrtype --dst-type BROADCAST -j DROP | |
| -A INPUT -m addrtype --dst-type MULTICAST -j DROP | |
| -A INPUT -m addrtype --dst-type ANYCAST -j DROP | |
| -A INPUT -d 224.0.0.0/4 -j DROP | |
| # Chain for preventing SSH brute-force attacks. | |
| # Permits 10 new connections within 5 minutes from a single host then drops | |
| # incomming connections from that host. Beyond a burst of 100 connections we | |
| # log at up 1 attempt per second to prevent filling of logs. | |
| -N SSHBRUTE | |
| -A SSHBRUTE -m recent --name SSH --set | |
| -A SSHBRUTE -m recent --name SSH --update --seconds 300 --hitcount 10 -m limit --limit 1/second --limit-burst 100 -j LOG --log-prefix "iptables[SSH-brute]: " | |
| -A SSHBRUTE -m recent --name SSH --update --seconds 300 --hitcount 10 -j DROP | |
| -A SSHBRUTE -j ACCEPT | |
| # Chain for preventing ping flooding - up to 6 pings per second from a single | |
| # source, again with log limiting. Also prevents us from ICMP REPLY flooding | |
| # some victim when replying to ICMP ECHO from a spoofed source. | |
| -N ICMPFLOOD | |
| -A ICMPFLOOD -m recent --set --name ICMP --rsource | |
| -A ICMPFLOOD -m recent --update --seconds 1 --hitcount 6 --name ICMP --rsource --rttl -m limit --limit 1/sec --limit-burst 1 -j LOG --log-prefix "iptables[ICMP-flood]: " | |
| -A ICMPFLOOD -m recent --update --seconds 1 --hitcount 6 --name ICMP --rsource --rttl -j DROP | |
| -A ICMPFLOOD -j ACCEPT | |
| ############################################################################### | |
| # 2. HOST SPECIFIC RULES # | |
| # # | |
| # This section is a good place to enable your host-specific services. # | |
| # ! DO NOT FORGOT TO COPY THESE RULES TO firewall.ip6tables TO ALLOW IPV6 ! # | |
| ############################################################################### | |
| # Accept HTTP and HTTPS | |
| #-A INPUT -p tcp -m multiport --dports 80,443 --syn -m conntrack --ctstate NEW -j ACCEPT | |
| ############################################################################### | |
| # 3. GENERAL RULES # | |
| # # | |
| # This section contains general rules that should be suitable for most hosts. # | |
| ############################################################################### | |
| # Accept worldwide access to SSH and use SSHBRUTE chain for preventing | |
| # brute-force attacks. | |
| -A INPUT -p tcp --dport 22 --syn -m conntrack --ctstate NEW -j SSHBRUTE | |
| # Permit useful IMCP packet types. | |
| # Note: RFC 792 states that all hosts MUST respond to ICMP ECHO requests. | |
| # Blocking these can make diagnosing of even simple faults much more tricky. | |
| # Real security lies in locking down and hardening all services, not by hiding. | |
| -A INPUT -p icmp --icmp-type 0 -m conntrack --ctstate NEW -j ACCEPT | |
| -A INPUT -p icmp --icmp-type 3 -m conntrack --ctstate NEW -j ACCEPT | |
| -A INPUT -p icmp --icmp-type 8 -m conntrack --ctstate NEW -j ICMPFLOOD | |
| -A INPUT -p icmp --icmp-type 11 -m conntrack --ctstate NEW -j ACCEPT | |
| # Do not log packets that are going to ports used by SMB | |
| # (Samba / Windows Sharing). | |
| -A INPUT -p udp -m multiport --dports 135,445 -j DROP | |
| -A INPUT -p udp --dport 137:139 -j DROP | |
| -A INPUT -p udp --sport 137 --dport 1024:65535 -j DROP | |
| -A INPUT -p tcp -m multiport --dports 135,139,445 -j DROP | |
| # Do not log packets that are going to port used by UPnP protocol. | |
| -A INPUT -p udp --dport 1900 -j DROP | |
| # Do not log late replies from nameservers. | |
| -A INPUT -p udp --sport 53 -j DROP | |
| # Good practise is to explicately reject AUTH traffic so that it fails fast. | |
| -A INPUT -p tcp --dport 113 --syn -m conntrack --ctstate NEW -j REJECT --reject-with tcp-reset | |
| # Prevent DOS by filling log files. | |
| -A INPUT -m limit --limit 1/second --limit-burst 100 -j LOG --log-prefix "iptables[DOS]: " | |
| COMMIT | |
| ############################################################################### | |
| # 4. HOST SPECIFIC NAT RULES # | |
| # # | |
| # Uncomment this section if you want to use NAT table, e.g. for port # | |
| # forwarding, redirect, masquerade... # | |
| ############################################################################### | |
| #*nat | |
| # Base policy | |
| #:PREROUTING ACCEPT [0:0] | |
| #:POSTROUTING ACCEPT [0:0] | |
| #:OUTPUT ACCEPT [0:0] | |
| # Redirect port 21 to local port 2121 | |
| #-A PREROUTING -i eth0 -p tcp --dport 21 -j REDIRECT --to-port 2121 | |
| # Forward port 8080 to port 80 on host 192.168.1.10 | |
| #-A PREROUTING -i eth0 -p tcp --dport 8080 -j DNAT --to-destination 192.168.1.10:80 | |
| #COMMIT |
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| ############################################################################### | |
| # The MIT License | |
| # | |
| # Copyright 2012-2014 Jakub Jirutka <jakub@jirutka.cz>. | |
| # | |
| # Permission is hereby granted, free of charge, to any person obtaining a copy | |
| # of this software and associated documentation files (the "Software"), to deal | |
| # in the Software without restriction, including without limitation the rights | |
| # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
| # copies of the Software, and to permit persons to whom the Software is | |
| # furnished to do so, subject to the following conditions: | |
| # | |
| # The above copyright notice and this permission notice shall be included in | |
| # all copies or substantial portions of the Software. | |
| # | |
| # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
| # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
| # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
| # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
| # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
| # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
| # THE SOFTWARE. | |
| # | |
| ############################################################################### | |
| # | |
| # Basic ip6tables/IPv6 template for an ordinary servers | |
| # | |
| # This file is in iptables-restore format. See the man pages for | |
| # ip6tables-restore(8) and ip6tables-save(8). | |
| # | |
| # The following is a set of firewall rules that should be applicable to Linux | |
| # servers running within departments. It is intended to provide a useful | |
| # starting point from which to devise a comprehensive firewall policy for | |
| # a host. | |
| # | |
| # Parts 1 and 3 of these rules are the same for each host, whilst part 2 can be | |
| # populated with rules specific to particular hosts. | |
| # | |
| # This template is based on http://jdem.cz/v64a3 from University of Leicester. | |
| # | |
| # For the newest version go to https://gist.github.com/jirutka/3742890. | |
| # | |
| # @author Jakub Jirutka <jakub@jirutka.cz> | |
| # @version 1.3.1 | |
| # @date 2014-01-28 | |
| # | |
| ############################################################################### | |
| # 1. COMMON HEADER # | |
| # # | |
| # This section is a generic header that should be suitable for most hosts. # | |
| ############################################################################### | |
| *filter | |
| # Base policy | |
| :INPUT DROP [0:0] | |
| :FORWARD DROP [0:0] | |
| :OUTPUT ACCEPT [0:0] | |
| # Don't attempt to firewall internal traffic on the loopback device. | |
| -A INPUT -i lo -j ACCEPT | |
| # Continue connections that are already established or related to an established | |
| # connection. | |
| -A INPUT -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT | |
| # Drop non-conforming packets, such as malformed headers, etc. | |
| -A INPUT -m conntrack --ctstate INVALID -j DROP | |
| # Block remote packets claiming to be from a loopback address. | |
| -A INPUT -s ::1/128 ! -i lo -j DROP | |
| # Chain for preventing SSH brute-force attacks. | |
| # Permits 10 new connections within 5 minutes from a single host then drops | |
| # incomming connections from that host. Beyond a burst of 100 connections we | |
| # log at up 1 attempt per second to prevent filling of logs. | |
| -N SSHBRUTE | |
| -A SSHBRUTE -m recent --name SSH --set | |
| -A SSHBRUTE -m recent --name SSH --update --seconds 300 --hitcount 10 -m limit --limit 1/second --limit-burst 100 -j LOG --log-prefix "ip6tables[SSH-brute]: " | |
| -A SSHBRUTE -m recent --name SSH --update --seconds 300 --hitcount 10 -j DROP | |
| -A SSHBRUTE -j ACCEPT | |
| # Chain for preventing ping flooding - up to 6 pings per second from a single | |
| # source, again with log limiting. Also prevents us from ICMP REPLY flooding | |
| # some victim when replying to ICMP ECHO from a spoofed source. | |
| -N ICMPFLOOD | |
| -A ICMPFLOOD -m recent --set --name ICMP --rsource | |
| -A ICMPFLOOD -m recent --update --seconds 1 --hitcount 6 --name ICMP --rsource --rttl -m limit --limit 1/sec --limit-burst 1 -j LOG --log-prefix "ip6tables[ICMP-flood]: " | |
| -A ICMPFLOOD -m recent --update --seconds 1 --hitcount 6 --name ICMP --rsource --rttl -j DROP | |
| -A ICMPFLOOD -j ACCEPT | |
| ############################################################################### | |
| # 2. HOST SPECIFIC RULES # | |
| # # | |
| # This section is a good place to enable your host-specific services. # | |
| ############################################################################### | |
| # Accept HTTP and HTTPS | |
| #-A INPUT -p tcp -m multiport --dports 80,443 --syn -m conntrack --ctstate NEW -j ACCEPT | |
| ############################################################################### | |
| # 3. GENERAL RULES # | |
| # # | |
| # This section contains general rules that should be suitable for most hosts. # | |
| ############################################################################### | |
| # Accept worldwide access to SSH and use SSHBRUTE chain for preventing | |
| # brute-force attacks. | |
| -A INPUT -p tcp --dport 22 --syn -m conntrack --ctstate NEW -j SSHBRUTE | |
| # Permit needed ICMP packet types for IPv6 per RFC 4890. | |
| -A INPUT -p ipv6-icmp --icmpv6-type 1 -j ACCEPT | |
| -A INPUT -p ipv6-icmp --icmpv6-type 2 -j ACCEPT | |
| -A INPUT -p ipv6-icmp --icmpv6-type 3 -j ACCEPT | |
| -A INPUT -p ipv6-icmp --icmpv6-type 4 -j ACCEPT | |
| -A INPUT -p ipv6-icmp --icmpv6-type 133 -j ACCEPT | |
| -A INPUT -p ipv6-icmp --icmpv6-type 134 -j ACCEPT | |
| -A INPUT -p ipv6-icmp --icmpv6-type 135 -j ACCEPT | |
| -A INPUT -p ipv6-icmp --icmpv6-type 136 -j ACCEPT | |
| -A INPUT -p ipv6-icmp --icmpv6-type 137 -j ACCEPT | |
| -A INPUT -p ipv6-icmp --icmpv6-type 141 -j ACCEPT | |
| -A INPUT -p ipv6-icmp --icmpv6-type 142 -j ACCEPT | |
| -A INPUT -s fe80::/10 -p ipv6-icmp --icmpv6-type 130 -j ACCEPT | |
| -A INPUT -s fe80::/10 -p ipv6-icmp --icmpv6-type 131 -j ACCEPT | |
| -A INPUT -s fe80::/10 -p ipv6-icmp --icmpv6-type 132 -j ACCEPT | |
| -A INPUT -s fe80::/10 -p ipv6-icmp --icmpv6-type 143 -j ACCEPT | |
| -A INPUT -p ipv6-icmp --icmpv6-type 148 -j ACCEPT | |
| -A INPUT -p ipv6-icmp --icmpv6-type 149 -j ACCEPT | |
| -A INPUT -s fe80::/10 -p ipv6-icmp --icmpv6-type 151 -j ACCEPT | |
| -A INPUT -s fe80::/10 -p ipv6-icmp --icmpv6-type 152 -j ACCEPT | |
| -A INPUT -s fe80::/10 -p ipv6-icmp --icmpv6-type 153 -j ACCEPT | |
| # Permit IMCP echo requests (ping) and use ICMPFLOOD chain for preventing ping | |
| # flooding. | |
| -A INPUT -p ipv6-icmp --icmpv6-type 128 -j ICMPFLOOD | |
| # Do not log packets that are going to ports used by SMB | |
| # (Samba / Windows Sharing). | |
| -A INPUT -p udp -m multiport --dports 135,445 -j DROP | |
| -A INPUT -p udp --dport 137:139 -j DROP | |
| -A INPUT -p udp --sport 137 --dport 1024:65535 -j DROP | |
| -A INPUT -p tcp -m multiport --dports 135,139,445 -j DROP | |
| # Do not log packets that are going to port used by UPnP protocol. | |
| -A INPUT -p udp --dport 1900 -j DROP | |
| # Do not log late replies from nameservers. | |
| -A INPUT -p udp --sport 53 -j DROP | |
| # Good practise is to explicately reject AUTH traffic so that it fails fast. | |
| -A INPUT -p tcp --dport 113 --syn -m conntrack --ctstate NEW -j REJECT --reject-with tcp-reset | |
| # Prevent DOS by filling log files. | |
| -A INPUT -m limit --limit 1/second --limit-burst 100 -j LOG --log-prefix "ip6tables[DOS]: " | |
| COMMIT |
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