Network hackerspace Strassen

Revision as of 23:48, 3 November 2010

Overview

Every hackerspace has a network to connect to the Internets, so does syn₂cat

Bring your laptop or use one of the available PCs, plug it in and off you go. There's also wireless LAN available.

Layout

Here's the current layout in fancy ASCII art.

DSL -- thomson -- Lusitania :::: miniswitch == wall ports in ADHS rooms
                      ||
                      ||
                  3com Rack -- photoborg
                      "
                      "
                      "
                      "
                  3com Core == wall ports in syn2cat rooms
                      ||
                      ||
                  OpenDuino, switches, HPprinter, dd-wrt

Legend:

  * -- single cable
  * == more than one cable
  * "" fiber trunk
  * ::: VLAN
  * ... wlan cable

IP

We provide both IPv4 and IPv6 connectivity in the hackerspace.

Wireless

We have two access points (APs).
One of them operates in WPA2-Enterprise mode, the other in WPA2-Personal. The WPA2-Personal AP uses the formerly published pre-shared-password (you can find it in the space).

The WPA2-Enterprise AP uses a radius server for authenticating users with their WIKI account.
Only paying sy2cat members are able to use their WIKI login to access this AP.

Use the following settings:
Security: WPA2 Enterprise
Authentication: Tunneled TLS (TTLS)
Inner authentication: PAP
Username: <wiki-user>
Password: <wiki-password>

or

Security: WPA2 Enterprise
Authentication: PEAP
Inner authentication: MSCHAPv2
Username: <syn2cat-user>
Password: <syn2cat-password>

Be sure to use exactly those settings, else it will not work.
Note: PEAP+MSCHAPv2 will only work if you have changed your password on the syn2cat server after the 12th of October. Ask an admin for more information.

Howto: H4x0roam with netcfg and encrypted wpa_supplicant config

This howto was written for Archlinux users, but it should also work on any other distro. Before trying this, you should make sure that netcfg, openssl, and wpa_supplicant are installed on your machine. Execute all shell commands as root unless specified otherwise.

The configuration file for wpa_supplicant is going to be stored only in an encrypted form on the hard drive, as it contains you Hackerspace account credentials in clear text. The decrypted version of the config will *only* be stored in a ramdisk, which is going to be automatically mounted and dismounted upon starting and stopping the h4x0roam network profile.

Create the directory for the ramdisk:

mkdir -p /etc/network.d/secure/ramdisks/h4x0roam
chmod -R 0700 /etc/network.d/secure

Create the network profile as /etc/network.d/h4x0roam with the following content:

CONNECTION='wireless'
DESCRIPTION='A secure wpa_supplicant configuration based wireless connection'
INTERFACE='wlan0'
SECURITY='wpa-config'
PRE_UP="mount -t ramfs h4x0roam-ramdisk /etc/network.d/secure/ramdisks/h4x0roam/ ; openssl enc -d -aes-256-cbc -in /etc/network.d/secure/h4x0roam.aes -out /etc/network.d/secure/ramdisks/h4x0roam/h4x0roam"
PRE_DOWN="cat /etc/network.d/secure/h4x0roam.aes > /etc/network.d/secure/ramdisks/h4x0roam/h4x0roam ; umount h4x0roam-ramdisk"
WPA_CONF='/etc/network.d/secure/ramdisks/h4x0roam/h4x0roam'
IP='dhcp' 

Now we temporarily mount a ramdisk where we will create the configuration file for wpa_supplicant:

mount -t ramfs h4x0roam-ramdisk /etc/network.d/secure/ramdisks/h4x0roam/

Create a file /etc/network.d/secure/ramdisks/h4x0roam/h4x0roam with the following content (you'll obviously have to fill in your own username and password):

ctrl_interface=/var/run/wpa_supplicant
network={
	ssid="h4x0roam"
	bssid=00:21:29:E9:D1:AA
	key_mgmt=WPA-EAP
	eap=PEAP
	identity="YOUR HACKERSPACE USERNAME"
	password="YOUR HACKERSPACE PASSWORD"
	phase2="auth=MSCHAPV2"
	ca_cert="/etc/ssl/h4x0roam/combined-ca.pem"
	client_cert="/etc/ssl/h4x0roam/lusitania.int.hackerspace.lu_infr.crt"
}

Save an encrypted version of the file to /etc/network.d/secure/h4x0roam.aes (remember the encryption password!) and dismount the ramdisk:

openssl enc -aes-256-cbc -salt -in /etc/network.d/secure/ramdisks/h4x0roam/h4x0roam -out /etc/network.d/secure/h4x0roam.aes
chmod 0600 /etc/network.d/secure/h4x0roam.aes
cat /etc/network.d/secure/h4x0roam.aes > /etc/network.d/secure/ramdisks/h4x0roam/h4x0roam
umount /etc/network.d/secure/ramdisks/h4x0roam/

Install h4x0roam's SSL certificate chain:

mkdir -p /etc/ssl/h4x0roam
wget http://www.hackerspace.lu/certs/syn2catCA.crt -O /etc/ssl/h4x0roam/syn2catCA.crt
wget http://www.hackerspace.lu/certs/syn2catInfr.crt -O /etc/ssl/h4x0roam/syn2catInfr.crt
wget http://www.hackerspace.lu/certs/lusitania.int.hackerspace.lu_infr.crt -O /etc/ssl/h4x0roam/lusitania.int.hackerspace.lu_infr.crt
cat /etc/ssl/h4x0roam/syn2catInfr.crt /etc/ssl/h4x0roam/syn2catCA.crt > /etc/ssl/h4x0roam/combined-ca.pem
chmod 0644 /etc/ssl/h4x0roam/*

Now you should be ready to go, so let's test your new network profile:

netcfg h4x0roam

SSL certificates

https://www.hackerspace.lu/certs/lusitania.int.hackerspace.lu_infr.crt (updated 2010.10.12)

OS compatibility

• Linux works out of the box
  
• Windows works out of the box
  
• OSX works out of the box
  
• iphone works out of the box
  
• Android works fine with v1.6+
  
• Symbian works fine
  
• Maemo OS works fine
  

WICD template

Save this as "/etc/wicd/encryption/templates/eap-ttls" and add the filename to "/etc/wicd/encryption/templates/active".

name = EAP-TTLS
author = username
version = 1
require identity *Identity password *Password auth *Authentication
-----
ctrl_interface=/var/run/wpa_supplicant
network={
        ssid="$_ESSID"
        scan_ssid=$_SCAN
        eap=TTLS
        key_mgmt=WPA-EAP
        identity="$_IDENTITY"
        password="$_PASSWORD"
        phase2="auth=$_AUTH"
}

Dev Links

• http://en.wikipedia.org/wiki/Extensible_Authentication_Protocol
• http://en.wikipedia.org/wiki/Protected_Extensible_Authentication_Protocol
• http://tldp.org/HOWTO/8021X-HOWTO/freeradius.html
• http://wiki.freeradius.org/WPA_HOWTO
• http://wiki.freeradius.org/SQL_HOWTO
• http://www.dslreports.com/forum/remark,9286052~mode=flat
• http://ubuntuforums.org/showthread.php?t=478804
• http://www.mail-archive.com/freeradius-users@lists.freeradius.org/msg18906.html
• http://wiki.freeradius.org/Modules
• http://www.mail-archive.com/freeradius-users@lists.cistron.nl/msg14674.html
• http://svn.dd-wrt.com:8000/dd-wrt/browser/src/router/freeradius/src/modules/rlm_python/prepaid.py