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-   -   How to install BFD (Brute Force Detection) (http://www.howtoforge.com/forums/showthread.php?t=718)

domino 30th September 2005 18:52

How to install BFD (Brute Force Detection)
 
What is BFD (Brute Force Detection)?

BFD is a modular shell script for parsing applicable logs and checking for authentication failures. There is not much complexity or detail to BFD yet and likewise it is very straight-forward in its installation, configuration and usage. The reason behind BFD is very simple; the fact there is little to no authentication and brute force auditing programs in the linux community that work in conjunction with a firewall or real-time facility to place bans. BFD is available at: http://www.rfxnetworks.com/bfd.php

How-To: http://www.webhostgear.com/60.html

badben 17th October 2005 15:48

This may seem like a daft question but is this compatible with ISP Config.

I am very new, embarasingly so, to linux and servers and do not want to destroy my current setup but this sounds like a very good idea security wise.

Ben

falko 17th October 2005 16:23

Quote:

Originally Posted by badben
This may seem like a daft question but is this compatible with ISP Config.

I am very new, embarasingly so, to linux and servers and do not want to destroy my current setup but this sounds like a very good idea security wise.

Ben

I don't see why it shouldn't be compatible with ISPConfig. :) As far as I understand, it's just a shell script that parses log files for attempted attacks.

domino 17th October 2005 18:05

APF and BFD (BFD needs APF to work) runs completly independent from ISPConfig. You may install it without worrying about breaking IPFC. You just have to turn off the firewall option in ISPC Control Panel before installing APF and BFD. Please do read the MAN pages and look at example config files so that you dont lock youself out.

badben 17th October 2005 21:51

Thanks.

Ben

Ovidiu 12th March 2006 02:03

one more question:

I started using apf with the ad and bfd modules, yet I still see entries like these in my logfiles:

Quote:

Mar 11 01:16:01 h5810 sshd[29407]: Failed password for root from 81.169.130.24 port
44345 ssh2
Mar 11 01:16:02 h5810 sshd[29419]: Failed password for root from 81.169.130.24 port
44592 ssh2
Mar 11 01:16:02 h5810 sshd[29422]: Failed password for root from 81.169.130.24 port
44620 ssh2
Mar 11 01:16:02 h5810 sshd[29424]: Failed password for root from 81.169.130.24 port
44647 ssh2
Mar 11 01:16:02 h5810 sshd[29426]: Failed password for root from 81.169.130.24 port
44674 ssh2
Mar 11 01:16:02 h5810 sshd[29428]: Failed password for root from 81.169.130.24 port
44697 ssh2
Mar 11 01:16:02 h5810 sshd[29430]: Failed password for root from 81.169.130.24 port
44718 ssh2
Mar 11 01:16:03 h5810 sshd[29432]: Failed password for root from 81.169.130.24 port
44743 ssh2
Mar 11 01:16:03 h5810 sshd[29434]: Failed password for illegal user carol from
81.169.130.24 port 44764 ssh2
Mar 11 01:16:03 h5810 sshd[29436]: Failed password for illegal user cesar from
81.169.130.24 port 44786 ssh2
Mar 11 01:16:03 h5810 sshd[29438]: Failed password for illegal user clark from
81.169.130.24 port 44809 ssh2
Mar 11 01:16:03 h5810 sshd[29443]: Failed password for illegal user clinton from
81.169.130.24 port 44832 ssh2
Mar 11 01:16:04 h5810 sshd[29445]: Failed password for illegal user kayla from
81.169.130.24 port 44859 ssh2
Mar 11 01:16:04 h5810 sshd[29447]: Failed password for illegal user russ from
81.169.130.24 port 44881 ssh2
Mar 11 01:16:04 h5810 sshd[29449]: Failed password for illegal user white from
81.169.130.24 port 44906 ssh2
Mar 11 01:16:04 h5810 sshd[29451]: Failed password for illegal user danny from
81.169.130.24 port 44935 ssh2
Mar 11 01:16:04 h5810 sshd[29453]: Failed password for illegal user filip from
81.169.130.24 port 44970 ssh2
Mar 11 01:16:05 h5810 sshd[29455]: Failed password for illegal user stephanie from
81.169.130.24 port 45001 ssh2
Mar 11 01:16:05 h5810 sshd[29457]: Failed password for root from 81.169.130.24 port
45038 ssh2
Mar 11 01:16:05 h5810 sshd[29459]: Failed password for root from 81.169.130.24 port
45071 ssh2
Mar 11 01:16:05 h5810 sshd[29461]: Failed password for root from 81.169.130.24 port
45103 ssh2
Mar 11 01:16:05 h5810 sshd[29463]: Failed password for root from 81.169.130.24 port
45133 ssh2
Mar 11 01:16:05 h5810 sshd[29465]: Failed password for root from 81.169.130.24 port
45164 ssh2
Mar 11 01:16:06 h5810 sshd[29467]: Failed password for root from 81.169.130.24 port
45194 ssh2
Mar 11 01:16:06 h5810 sshd[29469]: Failed password for root from 81.169.130.24 port
45226 ssh2
Mar 11 01:16:06 h5810 sshd[29471]: Failed password for root from 81.169.130.24 port
45258 ssh2
Mar 11 01:16:06 h5810 sshd[29473]: Failed password for root from 81.169.130.24 port
45290 ssh2
Mar 11 01:16:06 h5810 sshd[29475]: Failed password for root from 81.169.130.24 port
45320 ssh2
Mar 11 01:16:07 h5810 sshd[29477]: Failed password for root from 81.169.130.24 port
45355 ssh2
Mar 11 01:16:07 h5810 sshd[29479]: Failed password for root from 81.169.130.24 port
45388 ssh2
Mar 11 01:16:07 h5810 sshd[29481]: Failed password for root from 81.169.130.24 port
45419 ssh2
Mar 11 01:16:07 h5810 sshd[29483]: Failed password for root from 81.169.130.24 port
45456 ssh2
Mar 11 01:16:07 h5810 sshd[29485]: Failed password for root from 81.169.130.24 port
45485 ssh2
Mar 11 01:16:08 h5810 sshd[29487]: Failed password for root from 81.169.130.24 port
45514 ssh2
Mar 11 01:16:08 h5810 sshd[29491]: Failed password for root from 81.169.130.24 port
45544 ssh2
Mar 11 01:16:08 h5810 sshd[29493]: Failed password for root from 81.169.130.24 port
45574 ssh2
Mar 11 01:16:08 h5810 sshd[29495]: Failed password for root from 81.169.130.24 port
45607 ssh2
Mar 11 01:16:08 h5810 sshd[29497]: Failed password for root from 81.169.130.24 port
45639 ssh2
Mar 11 01:16:09 h5810 sshd[29499]: Failed password for root from 81.169.130.24 port
45670 ssh2
Mar 11 01:16:09 h5810 sshd[29501]: Failed password for root from 81.169.130.24 port
45702 ssh2
Mar 11 01:16:09 h5810 sshd[29503]: Failed password for root from 81.169.130.24 port
45732 ssh2
Mar 11 01:16:09 h5810 sshd[29505]: Failed password for root from 81.169.130.24 port
45766 ssh2
Mar 11 01:16:09 h5810 sshd[29507]: Failed password for root from 81.169.130.24 port
45797 ssh2
Mar 11 01:16:09 h5810 sshd[29509]: Failed password for root from 81.169.130.24 port
45827 ssh2
Mar 11 01:16:10 h5810 sshd[29511]: Failed password for root from 81.169.130.24 port
45857 ssh2
Mar 11 01:16:10 h5810 sshd[29515]: Failed password for root from 81.169.130.24 port
45897 ssh2
Mar 11 01:16:10 h5810 sshd[29518]: Failed password for root from 81.169.130.24 port
45935 ssh2
Mar 11 01:16:10 h5810 sshd[29520]: Failed password for root from 81.169.130.24 port
45966 ssh2
Mar 11 01:16:11 h5810 sshd[29523]: Failed password for root from 81.169.130.24 port
46002 ssh2
Mar 11 01:16:11 h5810 sshd[29532]: Failed password for root from 81.169.130.24 port
46041 ssh2
Mar 11 01:16:11 h5810 sshd[29534]: Failed password for root from 81.169.130.24 port
46073 ssh2
Mar 11 01:16:11 h5810 sshd[29536]: Failed password for root from 81.169.130.24 port
46105 ssh2
Mar 11 01:16:11 h5810 sshd[29538]: Failed password for root from 81.169.130.24 port
46136 ssh2
Mar 11 01:16:12 h5810 sshd[29540]: Failed password for root from 81.169.130.24 port
46169 ssh2
Mar 11 01:16:12 h5810 sshd[29542]: Failed password for root from 81.169.130.24 port
46203 ssh2
Mar 11 01:16:12 h5810 sshd[29544]: Failed password for root from 81.169.130.24 port
46235 ssh2
Mar 11 01:16:12 h5810 sshd[29546]: Failed password for root from 81.169.130.24 port
46264 ssh2
Mar 11 01:16:12 h5810 sshd[29548]: Failed password for root from 81.169.130.24 port
46298 ssh2
Mar 11 01:16:12 h5810 sshd[29550]: Failed password for root from 81.169.130.24 port
46329 ssh2
Mar 11 01:16:13 h5810 sshd[29552]: Failed password for root from 81.169.130.24 port
46361 ssh2
Mar 11 01:16:13 h5810 sshd[29554]: Failed password for root from 81.169.130.24 port
46389 ssh2
Mar 11 01:16:13 h5810 sshd[29556]: Failed password for root from 81.169.130.24 port
46418 ssh2
Mar 11 01:16:13 h5810 sshd[29558]: Failed password for root from 81.169.130.24 port
46451 ssh2
Mar 11 01:16:13 h5810 sshd[29560]: Failed password for root from 81.169.130.24 port
46478 ssh2
Mar 11 01:16:14 h5810 sshd[29562]: Failed password for root from 81.169.130.24 port
46508 ssh2
Mar 11 01:16:14 h5810 sshd[29564]: Failed password for root from 81.169.130.24 port
46540 ssh2
Mar 11 01:16:14 h5810 sshd[29566]: Failed password for root from 81.169.130.24 port
46567 ssh2
Mar 11 01:16:14 h5810 sshd[29568]: Failed password for root from 81.169.130.24 port
46594 ssh2
Mar 11 01:16:14 h5810 sshd[29570]: Failed password for root from 81.169.130.24 port
46624 ssh2
Mar 11 01:16:14 h5810 sshd[29572]: Failed password for root from 81.169.130.24 port
46654 ssh2
Mar 11 01:16:15 h5810 sshd[29574]: Failed password for root from 81.169.130.24 port
46682 ssh2
Mar 11 01:16:15 h5810 sshd[29576]: Failed password for root from 81.169.130.24 port
46707 ssh2
Mar 11 01:16:15 h5810 sshd[29578]: Failed password for root from 81.169.130.24 port
46781 ssh2
Mar 11 01:16:15 h5810 sshd[29580]: Failed password for root from 81.169.130.24 port
46811 ssh2
Mar 11 01:16:16 h5810 sshd[29582]: Failed password for root from 81.169.130.24 port
46840 ssh2
Mar 11 01:16:16 h5810 sshd[29584]: Failed password for root from 81.169.130.24 port
46869 ssh2
Mar 11 01:16:16 h5810 sshd[29586]: Failed password for root from 81.169.130.24 port
46899 ssh2
Mar 11 01:16:16 h5810 sshd[29588]: Failed password for root from 81.169.130.24 port
46923 ssh2
Mar 11 01:16:16 h5810 sshd[29590]: Failed password for root from 81.169.130.24 port
46952 ssh2
Mar 11 01:16:17 h5810 sshd[29592]: Failed password for root from 81.169.130.24 port
46987 ssh2
Mar 11 01:16:17 h5810 sshd[29594]: Failed password for root from 81.169.130.24 port
47019 ssh2
Mar 11 01:16:17 h5810 sshd[29596]: Failed password for root from 81.169.130.24 port
47047 ssh2
Mar 11 01:16:18 h5810 sshd[29598]: Failed password for root from 81.169.130.24 port
47077 ssh2
Mar 11 01:16:18 h5810 sshd[29602]: Failed password for root from 81.169.130.24 port
47106 ssh2
Mar 11 01:16:18 h5810 sshd[29604]: Failed password for root from 81.169.130.24 port
47136 ssh2
Mar 11 01:16:18 h5810 sshd[29606]: Failed password for root from 81.169.130.24 port
47160 ssh2
Mar 11 01:16:18 h5810 sshd[29608]: Failed password for root from 81.169.130.24 port
47191 ssh2
Mar 11 01:16:18 h5810 sshd[29610]: Failed password for root from 81.169.130.24 port
47223 ssh2
shouldn't bfd take care of these or am I wrong?

falko 12th March 2006 14:43

I don't know BFD, but maybe this is interesting for you: http://www.howtoforge.com/preventing...with_denyhosts

Ovidiu 12th March 2006 20:30

as I have understood it bfd (=brute force detection) should take care of brute force attacks against any port and any service...

for ssh atacks I already run fail2ban which takes care of those - at least it should :-) I was just wondering why I see no action from bfd...

bwrob 17th March 2006 03:37

I run shorewall firewall with a rule like
ACCEPT net $FW tcp 22 - - 1/min:2
Means, one can log only twice in one min.
That seems to work they go away.
bob

JLChafardet 31st March 2006 22:40

Quote:

Originally Posted by Tenaka
as I have understood it bfd (=brute force detection) should take care of brute force attacks against any port and any service...

for ssh atacks I already run fail2ban which takes care of those - at least it should :-) I was just wondering why I see no action from bfd...

It does, but only if you have APF runing. if you have APF runing in DEVEL mode it will flush rules every 5 mins, so isnt of much use this way.


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