limit number of ssh connections

[Григорьев Александр]

Standard inetd(8) has many options including limiting connections based on IP-address. Can it help in this case?

20.09.2011, 00:02, "James Strother" <jstrother9109 at gmail.com>:
> That's an interesting project, I hadn't realized port knocking had
> become so easy to use.
>
> Unfortunately, for this particular server, I need to be able to
> provide a simple way for (a very limited number of) users to login
> into the system remotely using a variety of OS platforms.  So I don't
> think port knocking is a good fit here.
>
> Thanks,
>   Jim
>
> 2011/9/19 Григорьев Александр <mr.festin at yandex.ru>:
>
>>  If your target is protect freebsd box from bruting passwords from inet maybe security/knockd will help you?
>>
>>  19.09.2011, 23:05, "James Strother" <jstrother9109 at gmail.com>:
>>>  Does anyone know a good way of limiting the number of ssh attempts
>>>  from a single IP address?
>>>
>>>  I found the following website, which describes a variety of approaches:
>>>
>>>  http://www.freebsdwiki.net/index.php/Block_repeated_illegal_or_failed_SSH_logins
>>>
>>>  But I am honestly not really happy with any of them.  Continuously
>>>  polling log files for regex hits seems...well crude.  Just to give you
>>>  an idea of what I mean, here were some of the issues I had. The
>>>  sshd-scan.sh script allows IPs to be reinstated, but the timing is
>>>  dependent on how frequently you rotate logs.  sshguard has a pretty
>>>  website, but I can't actually find much useful documentation on how to
>>>  configure it.  fail2ban looks like it might work with sufficient work,
>>>  but the defaults are terrible.  By default, every time an IP is
>>>  reinstated, all IPs are reinstated.  Not to mention, at present I
>>>  can't seem to get it to trigger any hits.
>>>
>>>  I suppose I could keep shopping, but the truth is I just think polling
>>>  log files is the wrong way to solve the problem.  Anything based on
>>>  this approach is going to have a long latency and be highly dependent
>>>  on the unspecified and unstable formatting of log files (see
>>>  http://www.fail2ban.org/wiki/index.php/HOWTO_Mac_OS_X_Server_(10.4)
>>>  and the troubles an exclamation point can cause).
>>>
>>>  I would much much rather do something like this:
>>>
>>>  http://kevin.vanzonneveld.net/techblog/article/block_brute_force_attacks_with_iptables/
>>>
>>>  Does anyone know a way to do something similar with ipfw?
>>>
>>>  Thanks in advance,
>>>    Jim
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>
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