17 Apr
2014
17 Apr
'14
10:57 p.m.
On Thu, Apr 17, 2014 at 8:35 AM, <lleachii(a)aol.com> wrote:
(Please trim inclusions from previous messages)
_______________________________________________
All,
I've added a new tool that I'd like you to test. This web application should
provide the registration code required by APRS software suites. In order to
use it, you must browse to:
http://kb3vwg-010.ampr.org/tools/aprscode
or
http://44.60.44.10/tools/aprscode
If you're on AMPRNet, you should be able to enter the callsign and look up
the registration code. If you access it from outside of AMPRNet, you will be
prompted for an access code (1234).
Please let me know how it works
It's poor design to allow authorization via source address or
low-entropy password with no authentication. I was just able to
generate a passcode for KB3VWG, but I'm not KB3VWG. I certainly don't
want you handing out passcodes for KD7LXL. I already have mine
memorized, and no one else needs it.
A more prudent, yet still automated, scheme would be to authenticate
with a certificate. For example, a Logbook of the World certificate
from the ARRL contains your callsign, and is only issued by the ARRL
after verifying your identity. A web app using SSL client verification
could read the callsign from this certificate and return the APRS-IS
passcode for that callsign, and only that callsign. That is proper
authentication.
You might ask, why go through all that trouble when the APRS-IS
passcode is generated with a public algorithm? I agree with you there.
It would be prudent to implement better authentication on APRS-IS. I
have done so on the APRS server I manage: http://44.24.242.23:14501/
When connecting to the SSL ports, the server will read your callsign
out of a Logbook of the World certificate. If your client requests it,
the server will use only the authentication component of SSL,
disabling the encryption (important if you're connecting via RF).
Application support for this scheme is low right now (I've done it
with APRSDroid, and Xastir+stunnel), but I expect adoption to
increase.
Tom KD7LXL