Difference between revisions of "FireBrick IPsec (Road Warrior Howto)"

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= FireBrick mobileRoad phoneWarrior IPsec =
The FireBrick manual goes in tointo some detail on configuring IPsec. This page contains specific examples for a simple scenario where you have one or more clients devices - iPhones oriPads, Android phones/tablets or Windows machines, and a FireBrick in your home or office, and you would like to VPN (using IPsec) to the FireBrick and have an IP address on your LAN.
In this example we are assuming you can allocate some IP addresses on you LAN. You do this by picking a range of addresses and setting inup thea <tt>roamroaming-pool</tt> (see below). You need to ensure thesethe IP range dodoes not clash with devices on the LAN and areis not in the DHCP ranges that could allocate to the LAN. You would also need to set <tt>proxy-arp</tt> on the LAN interface settings to allow communications to other devices on your LAN. Alternatively you could set private IP addresses in the pool and set the <tt>nat</tt> setting. You should probably also include need to consider firewalling rules for traffic to/from IPsec connections.
== Tools ==
There are three tools to help with setting up Road Warrior connections on the FireBrick web site. You can download these
Thereby areviewing threewith toolsa onbrowser theand FireBricksaving webthe site. You can download these (save from browsersource, or useusing curl or wget). [http://www.firebrick.co.uk/tools/make-key make-key] creates a private key. [http://www.firebrick.co.uk/tools/make-cert make-cert] makes a certificate (signed with a key). [http://www.firebrick.co.uk/tools/make-profile make-profile] makes an iPhone profile file that allows the VPN to be configured on the iPhone. For security reasons, all of these need you to run them commands locally (e.g. on a linux box, or windows under Cygwin).
== Certificate Authority ==
Let's start by making a Certificate Authority (CA). This signs certificates, such as the one we load in to the FireBrick end of the link. The CA ends up as being two files - one is the private ''key'' file, which you keep secret. This is what you need to sign things with the CA. The other is the actual certificate file, signed by the key.
First makingmake the private ''key'' file for the CA. We'll callscall it <tt>ca-key.pem</tt>. This file should be kept secret.
<tt>./make-key ca-key.pem</tt>
Then make a certificate file, and signingsign it using the ''key'' file. We'll call it <tt>ca-cert.pem</tt>. This involves several attributes in the DN (Distinguished name) which mostly don't matter much for your own certificate (/C=Country, /ST=State, /L=Locality, /O=OrganisationName, /CN=CommonName). Typically you would set just the CommonName, using your home or company name
(eg /CN=Acme Widget CA).
<tt>./make-cert CA DN="/C=GB/O=My Office/CN=example.com" KEY=ca-key.pem ca-cert.pem</tt>
== FireBrick (server) certificate ==
HereNest we make a certificate file for the FireBrick itself. This is how the FireBrick proves itself to the phoneclient device. Again, there is a ''key'' and a ''cert'' file for this, with both being loaded in to the FireBrick. The ''key'' is what allows the FireBrick to prove itself. The ''cert'' is signed by the CA key, which is how the phone knows to trust the FireBrick. Note the extra <tt>FQDN=</tt> which sets the SubjectAltName. The <tt>FQDN</tt> entry is just a name used to get the right certificate, and should match the <tt>local-id</tt> (prefixed <tt>FQDN:</tt>) in the config so that the FireBrick can work our which certificate to use when negotiating, and the client can check the certificate matches the server.
First make a private key, e.g. <tt>server-key.pem</tt>
<tt>./make-cert DN="/C=GB/O=Server/CN=server.example.com" FQDN=server.example.com KEY=server-key.pem ISSUER-KEY=ca-key.pem ISSUER=ca-cert.pem server-cert.pem</tt>
== FireBrick Certificate Config ==
The FireBrick needs copies of the CA certificate and the server certificate and private key.
The FireBrick needs a configuration for the connection, and roaming pools and user identities. The connection can be used for any number of devices at once with the same pool of IP addresses, each would have a user name and password defined.
Load thethese files - <tt>ca-cert.pem</tt>, <tt>server-key.pem</tt>, and <tt>server-cert.pem</tt> in- tousing tehthe FireBrick certificates.
X.509 certificate and key management UI page (Config Certificates).
The private key associated with the CA certificate <tt>ca-key.pem</tt> is no longer needed once it has been used to sign
the server certificate. It is a good idea to store this file in a safe place (eg on a memory stick in a secure location), and
remove it from any networked machine. It can of course be retrieved and reused if you wish to make further server
certificates using the same CA certificate.
== FireBrick IPsec config ==
The FireBrick needs a configuration for the connection, and roaming pools and user identities. The connection can be used for any number of devices at once with the same pool of IP addresses,; each would have a user name and password defined.
The basic server config is in <tt>ipsec-ike</tt> containing a <tt>connection</tt> and <tt>roaming</tt> entry, e.g.
<tt>&lt;eap name="''fred''" full-name="''Fred Bloggs''" password="''[password]''" subsystem="IPsec" methods="MSChapV2"/&gt;</tt>
Load the files <tt>ca-cert.pem</tt>, <tt>server-key.pem</tt>, and <tt>server-cert.pem</tt> in to teh FireBrick certificates.
== iPhone profile ==
Each iPhone then needs a profile file specific to that user. Once created you can email this, or make a web link to it, and the iPhone will recognise it and allow it to be installed. Let's call it <tt>fred.mobileconfig</tt> for our user called ''fred'' as in the above example config.
<tt>./make-profile SERVER=''IP-of-server'' LOCALID="''Fred's iPhone''" CA=ca-cert.pem SERVERID=''server.example.com'' USERNAME=''fred'' PROFNAME="''Office VPN''" VPNNAME=FireBrick ''fred''.mobileconfig</tt>

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