What do you think of this "SSH setup"?

lobezn0 · 01-23-2015, 02:48 AM

Hi,

I've been assigned to a new client where I got really surprised by the fact that, by default, they set SSH passwordless login for the root user between ALL servers they have installed, even between non-pro and pro boxes.

What do you think of this setup? IMO it's obviously insecure because if somebody gains access to one of the servers he can basically move around all the environment...

TenTenths · 01-23-2015, 02:52 AM

That would never survive any security audit.

All you can do is strongly recommend that this be changed, however if "the business" is willing to accept the risks then it's their network, their rules.

lobezn0 · 01-23-2015, 03:17 AM

I'll do that.

Thanks.

jpollard · 01-23-2015, 05:24 AM

Depending on how few servers are (this works better the more servers there are), you could suggest using Kerberos authentication instead of having keys all over the place.

That way there would be only one private key per system, and no general sharing except via the KDC. You get the equivalent, but with better auditing, and less administrative overhead.

Miati · 01-24-2015, 09:43 AM

I wouldn't be suprised if it's setup that way because it was the one that worked.
Since it works, apply a "don't fix if it ain't broke policy."

Maybe find out what is really needed & identify some ways to fine tune it?
I wrote some examples of setups.

This book is really good as well
(You know you want to support the OpenSSH team)

jpollard · 01-24-2015, 01:13 PM

Quote:

Originally Posted by Miati

I wouldn't be suprised if it's setup that way because it was the one that worked.
Since it works, apply a "don't fix if it ain't broke policy."

Maybe find out what is really needed & identify some ways to fine tune it?
I wrote some examples of setups.

This book is really good as well
(You know you want to support the OpenSSH team)

The problem is that if any ONE system does get broken into, ALL have to be considered broken into.