Vuurmuur - iptables manager
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1 Vuurmuur - iptables manager Victor Julien July 7, 2014 Victor Julien Vuurmuur - iptables manager July 7, / 23
2 About me Vuurmuur founder and lead developer of Vuurmuur Open Source Suricata IDS/IPS ModSecurity, libhtp, modsec2sguil, sguil, snort_inline Victor Julien Vuurmuur - iptables manager July 7, / 23
3 iptables Powerful, but complex Packet processing happens in several tables: mangle, filter, nat, raw Default chains: INPUT, OUTPUT, FORWARD and several others Also, define your own chains Don t get me started on traffic shaping Victor Julien Vuurmuur - iptables manager July 7, / 23
4 Rule Example Example of a rule: i p t a b l e s t f i l t e r A FORWARD i eth1 o ppp0 \ p tcp m tcp syn \ s / s p o r t 1024:65535 \ d / dport 4070 \ m l i m i t l i m i t 5/ sec l i m i t b u r s t 10 \ m conntrack c t s t a t e NEW \ j NFLOG nflog p r e f i x "ACCEPT " nflog group 9 Rather complex, right? Victor Julien Vuurmuur - iptables manager July 7, / 23
5 Vuurmuur Started in 2002 as a project to learn programming Born out of frustration with managing iptables scripts Mature, free-time project Therefore, slow moving project :) Victor Julien Vuurmuur - iptables manager July 7, / 23
6 Vuurmuur Goal Allow users to easily setup and manage a secure and efficient firewall, without needing iptables specific knowledge. Victor Julien Vuurmuur - iptables manager July 7, / 23
7 Vuurmuur Features Ncurses GUI manage over SSH Target is gateway firewalls Log viewer, connection viewer Easy way to setup NAT, portforwarding NFQUEUE support for integrating with Suricata IPS Basic traffic shaping and prioritization support Basic IPv6 support Keeps an audit log of all changes Victor Julien Vuurmuur - iptables manager July 7, / 23
8 Ncurses Victor Julien Vuurmuur - iptables manager July 7, / 23
9 Vuurmuur Concepts One or more zones : in/out, lan/wan, red/green Within each zone: one or more networks Within each network: one or more hosts (optional) Interface mapping with local interfaces Interfaces are connected to a network Services define protocols and ports Victor Julien Vuurmuur - iptables manager July 7, / 23
10 Concepts Victor Julien Vuurmuur - iptables manager July 7, / 23
11 Rules Rule Example accept service http from local.lan to world snat service http from local.lan to world About the names Zone names have a fixed structure "local.lan" means: zone "lan" and within that network "local" In "server.local.lan", "server" is the host This way it s always clear what part of your network a rule applies to Victor Julien Vuurmuur - iptables manager July 7, / 23
12 Rules Port forwarding rule Example portfw service ssh from world to myserver.servers.dmz Port forwarding rule example, with NFQUEUE nfqueue service smtp from world to mailserver.servers.dmz dnat service smtp from world to mailserver.servers.dmz Victor Julien Vuurmuur - iptables manager July 7, / 23
13 Rules Victor Julien Vuurmuur - iptables manager July 7, / 23
14 Rules Traffic Shaping Rule Example accept s e r v i c e any from voip. l o c a l. lan to world. i n e t \ options log, l o g l i m i t = " 1 ", \ in_min= " 50kbps ", out_min= " 50kbps ", p r i o = " 1 " Victor Julien Vuurmuur - iptables manager July 7, / 23
15 Vuurmuur How it works Read rules, zones, etc Turn into iptables and tc rulesets Feeds ruleset to iptables-restore Enable/disable ip forwarding if necessary Helpful command: vuuurmuur -b (bash out) Victor Julien Vuurmuur - iptables manager July 7, / 23
16 Log Viewer Victor Julien Vuurmuur - iptables manager July 7, / 23
17 Connection Viewer Victor Julien Vuurmuur - iptables manager July 7, / 23
18 Applying Changes Victor Julien Vuurmuur - iptables manager July 7, / 23
19 Ulogd2 Vuurmuur to JSON logging stack=log1 :NFLOG, base1 :BASE, i f i 1 : IFINDEX, \ i p 2 s t r 1 : IP2STR, mac2str1 :HWHDR, json1 :JSON [ log1 ] group=9 [ json1 ] sync=1 f i l e = " / var / log / ulogd. json " Victor Julien Vuurmuur - iptables manager July 7, / 23
![:JSON [ log1 ] group=9 [ json1 ] sync=1 f i l e = " / var / log /](/docs-images/40/9080402/images/page_19.jpg "ulogd.")
20 Ulogd2 PCAP Logging stack=log2 :NFLOG, base1 :BASE, pcap1 :PCAP [ log2 ] group=7 [ pcap1 ] f i l e = " / var / log / vuurmuur. pcap " sync=1 Victor Julien Vuurmuur - iptables manager July 7, / 23
21 Coming Soon In Development NFLOG / IDS target: support Suricata s NFLOG input (git master) Use Ulogd2 to replace vuurmuur_log Victor Julien Vuurmuur - iptables manager July 7, / 23
22 Coming soon? Future Work Nftables support ipset support SYNPROXY Real GUI? Web GUI? Victor Julien Vuurmuur - iptables manager July 7, / 23
23 Finally Get Involved! Open Source: GPLv2+ #vuurmuur on freenode Victor Julien Vuurmuur - iptables manager July 7, / 23
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