[smokeping-users] Slave-Master security

Tobias Oetiker tobi at oetiker.ch
Wed Mar 20 07:15:30 CET 2013

Yesterday Gregory Sloop wrote:

> Ok, so I've setup a test master-slave config, and the basic config
> looks good.
> So, I suppose this is essentially off-topic, but I'm wondering about
> hardening the communications between a master and a slave.
> In my case, I'm thinking of having slaves that communicate over an
> un-secure net [say the internet] back to the master.
> I know the shared secret [PSK] for the slave-master protect [kinda] so
> that an attacker can't stuff data into the SP master - but that
> doesnt' address someone finding a hole in the CGI etc.
> Essentially, if I let the world hit the smokeping.cgi, but only
> prevent writes, that does noting to prevent others from looking at my
> smokeping data [which I may not want to allow] or worse, attacking the
> smokeping.cgi in an attempt to crack the master machine. [And from
> what I can see, I can't easily use .htaccess files  over https to
> limit access, because the slaves don't grok that.]

basic auth would be quite simple to add to slaves I guess ... otoh,
you could also teach the slaves to use client certificates


you could further limit access by IP address on the server


> This is obviously bad.
> I've considered building VPN's or SSH tunnels between the slave(s) and
> masters - but does anyone have any tried-and-true methods that are
> perhaps less cumbersome - that I haven't considered?

> -Greg
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Tobi Oetiker, OETIKER+PARTNER AG, Aarweg 15 CH-4600 Olten, Switzerland
http://it.oetiker.ch tobi at oetiker.ch ++41 62 775 9902 / sb: -9900

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