mirror of https://github.com/dirtbags/moth.git
New OpenWRT configuration
This commit is contained in:
Neale Pickett
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This directory contains the files used to set up an OpenWRT router.
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Using an OpenWRT router
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=======================
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You can use an off-the-shelf, OpenWRT capable wireless router,
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configuring only through the web interface. The OpenWRT setup is
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intended for smaller contests, wired or non-wired, in which
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participants can be counted on not to launch link level attacks (ARP
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or NDP). Bear in mind that the cheap consumer routers have relatively
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slow CPUs and won't stand up to high volume.
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Bear in mind that the cheap consumer routers have relatively slow CPUs
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and won't stand up to high volume. This same configuration applies to
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OpenWRT running on an x86 PC, or any other target of OpenWRT. For
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larger contests, it would be a good idea to use a faster machine for the
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router. I don't have any specific recommendations at this time (Oct
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2010).
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The CTF repository includes a "router" package, which will boot a DBTL
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device as a IPv6 router complete with multicast forwarding and up to
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24 tagged VLANs (by using a managed switch). This is a better option
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for larger contests, and can better handle high-speed (Gigabit)
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traffic.
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The router comes up as 10.0.0.1/16 on eth0.
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Instructions for setting up OpenWRT
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-----------------------------------
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If the router has a built-in switch, it is brought up without VLAN
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support, since these switches typically only support 16 VLANs, and do
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not support QinQ (double VLAN tags). All 5 ports work like an unmanaged
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switch, which ends up being handy for the contest table.
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After installing OpenWRT:
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Plugging a managed switch into the router enables access to 48 VLANs,
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each configured to a /16 network. The router on VLAN number v comes up
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as 10.v.0.1/16.
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* Change the root password
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* Install the kmod-ipv6, radvd, and luci-app-radvd packages
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* Configure the LAN interface as 10.0.0.1/16 and
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fd84:b410:3441::1/64
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* Tell DHCP to begin at 257 after the base IP: this will assure
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all DHCP addresses are after 10.0.1.0
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* Disable router solicitations on LAN
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* Enable WPA2, with the password "correct horse battery staple"
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* Turn on router advertisements (under radvd) on LAN
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* Enable prefix fd84:b410:3441::1/54 under radvd
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If the router has the ability to come up as a wireless access point, it
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will do so with SSID "CTF" and IP 10.254.0.1/16.
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All subnets can route to all other subnets, through the router.
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10.0.0.1/16 and 10.254.0.1/16 may have a higher TTL when routed to a
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VLAN (I haven't checked). Keep in mind that anything connected directly
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to the router (ie. not through the managed switch) can do its own VLAN
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tagging. This would be the way to hop on another team's subnet to do
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something like check service availability in such a way as to prevent
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teams from firewalling each other out.
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SSID "CTF"
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10.254.0.1/16
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((Y))
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-------------
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| OpenWRT |
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-0-1-2-3-4---
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/| | | | |
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/ | | | | |
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/ | | | | |
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/ 10.0.0.1/16
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/
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-------------------t---
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| Managed Switch |
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-1-2-3-4-5-...-47-48---
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/ | | \
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/ | | \
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/ | | \
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/ | | \
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10.1.0.1/16 | | 10.48.0.1/16
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10.3.0.1/16 |
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10.47.0.1/16
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This should be sufficient to bring up the router for running the
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contest. If you want to get fancy, you can scp the files in
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www in this directory, into /www on the router. This will give
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users some guidance if they accidentally browse to the router IP,
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and also disables the default redirection to luci.
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@ -1,2 +0,0 @@
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config dnsmasq
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option leasefile '/tmp/dhcp.leases'
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@ -1,27 +0,0 @@
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#### Switch configuration
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config switch eth0
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option enable 1
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option enable_vlan 0
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#### Loopback configuration
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config interface loopback
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option ifname "lo"
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option proto static
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option ipaddr 127.0.0.1
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option netmask 255.0.0.0
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#### Administrative network
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config interface admin
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option ifname "eth0"
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option proto static
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option ipaddr 10.0.0.1
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option netmask 255.255.0.0
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#### Wireless
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config interface wifi
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option proto static
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option ipaddr 10.254.0.1
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option netmask 255.255.0.0
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# OpenWRT's "ifup/ifdown" are horribly slow, so the 48
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# vlans are set up in an init script :)
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config wifi-device wl0
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option type broadcom
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option channel 1
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config wifi-iface
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option device wl0
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option network wifi
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option mode ap
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option ssid CTF
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@ -1,26 +0,0 @@
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#! /bin/sh /etc/rc.common
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START=45
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STOP=89
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start () {
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stop
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iptables -P INPUT ACCEPT
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iptables -P OUTPUT ACCEPT
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iptables -P FORWARD ACCEPT
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iptables -A INPUT -p udp --dport 53 -j ACCEPT
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iptables -A INPUT -p udp --dport 67 -j ACCEPT
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iptables -A INPUT -p icmp --icmp-type echo-request -j ACCEPT
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iptables -A INPUT -s 10.0.0.0/16 -j ACCEPT
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iptables -A INPUT -j REJECT
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}
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stop () {
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iptables -F INPUT
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iptables -F OUTPUT
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iptables -F FORWARD
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}
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#! /bin/sh /etc/rc.common
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START=41
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STOP=89
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VLANS=48
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start () {
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for i in $(seq 1 $VLANS); do
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vconfig add eth0 $i
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ifconfig eth0.$i 10.$i.0.1 netmask 255.255.0.0
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done
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}
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stop () {
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for i in $(seq 1 $VLANS); do
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vconfig rem eth0.$i
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done
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}
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../init.d/iptables
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../init.d/vlan
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../init.d/vlan
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../init.d/iptables
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@ -0,0 +1,18 @@
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<DOCTYPE html>
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<html>
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<head>
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<title>Router</title>
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</head>
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<body>
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<p>
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You're in the wrong place. This is the router.
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</p>
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<ul>
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<li>
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CTF Server:
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<a href="http://[fd84:b410:3441::2]/">IPv6</a>, <a href="http://10.0.0.2/">IPv4</a>
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</li>
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<li><a href="password_strength.png">WPA2 password</a></li>
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</p>
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</body>
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</html>
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<h2>Rules</h2>
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<ul>
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<li>
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No DoS attacks.
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No DoS attacks. No link layer (ARP, NDP) attacks.
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</li>
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<li>
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Contest servers lie within <samp>fd84:b410:3441::/112</samp>
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