Hello,
what worked quite well so far for me was maintaining ipban and ipallow htables, adding to ipallow the address of a successfully authenticated request and adding to ipban the address of a flooding end point (detected via pike or pipelimit) which is not in ipallow.
Of course, skipping trusted fixed ip end points (e.g., pstn
gateways).
Most of the end points send the REGISTER and once authenticated
and gets back 200ok, then they flood with SUBSCRIBE for
BLF/MWI/Presence, but at that moment, the IP is in ipallow. I also
maintain an userban htable where to keep username:ip if that user
failed to authenticate 5 times in a row.
Anyhow, adding more layers of trusting levels is better.
Cheers,
Daniel
Hi
I only have ubuntu to hand. The latest v20.04 still seems to include a country db version, although it’s from Dec 2019.
Completely agree on security, and still wondering how much admin overhead maintaining it is.
At the moment I’m thinking of layering it like this;
- Fixed IP- Dynamic IP but Fixed ISP (AS)- Mobile but Fixed/Limited Country
- Mobile no restrictions
Also playing with matching User-Agent from headers against a list of RegEx’s to verify that the endpoint is the make/model expected.
GeoIP Module - Great. I’ll have a look at module source and try to document what’s involved.
CheersMark
On 27 Jul 2020, at 09:14, Daniel-Constantin Mierla <miconda@gmail.com> wrote:
Hello,
indeed, I noticed a while ago MaxMind requires registration to fetch the
latest database, from that point I was still using a local copy of an
older version for testing. Are the major Linux distros still shipping it?
I can add lookup of AS to the module -- it would be appreciated and
speed up things if you can give some references/links to the API/library
docs for it.
As for how much security it can bring, as always, it depends. If you
have only fixed lines customers, then it can be an extra check. But if
the people can use mobile apps, they can go in parks, or public places
and use mobile carriers or public wifi networks. Also, I encountered
situations when people do vpn from their mobile and show up as coming
from another country, a matter where the vpn server is located.
In general, the more restrictions you can set for end point locations,
the better. Still, they can be compromised even if they are inside a
known isp network...
Cheers,
Daniel
On 23.07.20 12:18, Mark Boyce wrote:
Hi all
Just looking at the latest GeoIP2 MaxMind databases (now requires registration, but still free) and noticed that they also include the AS (ISP) lookup one in the free offering.
Wondering if this is another way to facilitate better security for users on dynamic IP. Typically working from home these days.
So, rather than just limiting an end device to a country we could limit it to a particular ISP within that country.
Has anyone tried this? Have I missed a reason why this wouldn’t help? Admin overhead not worth it?
Thoughts?
Best regards
Mark
--
Mark Boyce
Dark Origins Ltd
_______________________________________________
Kamailio (SER) - Users Mailing List
sr-users@lists.kamailio.org
https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users
--
Daniel-Constantin Mierla -- www.asipto.com
www.twitter.com/miconda -- www.linkedin.com/in/miconda
Funding: https://www.paypal.me/dcmierla
-- Daniel-Constantin Mierla -- www.asipto.com www.twitter.com/miconda -- www.linkedin.com/in/miconda Funding: https://www.paypal.me/dcmierla