44net June 2013

44net@mailman.ampr.org

31 participants
31 discussions

VPN access to AMPRNet using amateur X.509 certificates

by Heikki Hannikainen

Hi, The AMPRNet might be more useful if it had: (1) more services which would be interesting to hams (2) more access to the AMPRNet Tonight I tried to attack (2) a bit. Access to the AMPRNet over the Internet could maybe be made easier to hams by allowing them to connect over VPNs instead of setting up their own IPIP tunnels at home, or trying to find a working radio gateway. After getting a VPN running it might be easier for them to set up a radio gateway, or some services. As discussed on the other mailing list, VPNs are easier to get up on NATed residential networks than IPIP tunnels. Setting up VPN user accounts and maintaining them can be a pain. It doesn't take a lot of weekly or monthly maintenance work to run a VPN service, but it can be a major pain to manage an user account database for thousands of hams and check if your users around the Internet are, in fact, licensed. It turns out that ARRL's Logbook of the World has already given out cryptographic X.509 certificates to 57334 amateur users, after verifying their license status against the FCC database (they send a postcard with a random token code to the FCC-listed snail-mail address to make sure they give the certificate to the right guy) or after looking at a paper photocopy of a license + a photo ID. I had to physically mail in a photo of my ham license and my driver's license and wait a couple weeks to get the cert. If they can get 50k contesters and DXers to work with certificates, maybe certs can work for the AMPRnet, too. Technically, we can validate if a VPN user is in possession of one of those certificates and the respective private key. Politically, K4JH asked the ARRL guys, and they said that they don't mind if we use them for other ham authentication needs. We can start accepting other CAs too once they come around. I plan to help SRAL, the Finnish amateur radio union, to set up a CA within their web site (they already have user accounts for members). I know ARRL isn't for everyone, but smaller clubs could set up CAs too, or even commercial entities - as long as we trust them to do the license validation in a proper manner. Tonight I hacked up an OpenVPN setup which authenticates users with LoTW certs, and wrote a little documentation: http://wiki.ampr.org/index.php/AMPRNet_VPN What do you think? Technically, it seems to work - try it out if you like. It's not very straightforward to set up, but the license validation is pretty strong, and running the service shouldn't be a lot of work. There can be many VPN servers around the world, serving the whole customer base (VPN servers do not need access to any central user database, they just need the certificates of the trusted CAs). With a little Dynamic DNS magic, you could get a oh7lzb.vpn.ampr.org hostname on DNS within a few seconds after connecting (I've got code for that in another project). (Yes, eventually certificates need to be revoked after they accidentally get into wrong hands, or ham licenses are revoked. Technically that can be done using CRLs and/or OCSP, but ARRL apparently does not do those yet. Maybe they will, if the need arises. We can also set up a blocked certificates list of our own.) - Hessu, OH7LZB

10 years, 11 months

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

44net June 2013