Monday, December 12, 2016

aprs.fi moving to TLS

In an effort to increase security on the web at large scale, web browser vendors and other organisations such as Google are making changes which encourage web sites to move to TLS/SSL encryption. Even web sites which previously did not seem to need it – ones with static content only, and ones without any login / password functionality. This is good and fine – even if it's not a banking web site, it's good that third parties along the network can not observe or modify the content being downloaded. The Chrome web browser has started to label non-encrypted sites with an informative '(i)' symbol which warns the user that "Your connection to this site is not private", and will eventually make those warnings stronger. Google gives better ranking in the search results for https sites.

A real, practical issue right now is that the geolocation Javascript API is no longer available on non-HTTPS sites in recent Android and Chrome versions. This actually broke map center and tracking functionality on the aprs.fi web site.

I wholeheartedly support this movement, it will make the Internet a better place!

These days, with performance-improving developments such as ECDHE, GCM mode AES and hardware accelerated AES, running TLS on a web server is not much of a performance issue any more. Most of the CPU time will be spent on application logic, anyway.

The fun part is that HTTP/2, a new protocol used by modern web browser to access web sites, is only used over TLS/HTTPS – it is not available over plaintext connections. HTTP/2 is faster than older HTTP versions, and a surprising side effect is that a web site may well open up faster over HTTP/2 + TLS than over HTTP 1.1 without the encryption!

Picture not related. I just took it last summer. Kyyttö cows © Sappion luomu.
Before now, aprs.fi has only used TLS/HTTPS for its login and user account management pages. Fairly soon I will have a maintenance break on the aprs.fi servers, upgrade the operating system to the next major release, and install a new version of the aprs.fi software which supports access over both HTTP and HTTPS. To reduce duplicate content (same stuff being available over both HTTP and HTTPS) it will prefer HTTPS and nudge clients that way every now and then, but initially plaintext access should be possible, too. Later on, if there are no surprises, the nudges will gradually become stronger.

There are a few issues which need to be addressed. There are possibly a few Amprnet users accessing this site over amateur radio frequencies. On the other hand, they're then practically surfing the Internet over radio, and probably doing a few requests to other encrypted sites now and then, too, so maybe it's not a big problem for them.

Another thing is that apparently users in China can't access the Google Maps API over HTTPS, so those users would still need the plaintext access for now. I might make the zh.aprs.fi site plaintext only, and bump those users that way, or something along that way. Maybe the Amprnet users can use that, too?

2 comments:

Steffan Jeschek said...

Hi!

I just changed my website (wordpress) from http over to https via lets encrypt certificate.
Scince that moment the aprs.fi javascript is not loading anymore.
Is there a new script available that uses the https too?

kind regards, 73
Steffan

Heikki Hannikainen said...

Hi,

No, not yet. That'll come with the overall TLS support a bit later on.