Commit Graph

19 Commits

Author SHA1 Message Date
Michael Kroes 01fa8cf72c add fail2ban jails for ownCloud, postfix submission, roundcube, and the Mail-in-a-Box management daemon
(tests squashed into this commit by josh)
2016-06-06 09:13:10 -04:00
Chris Blankenship fac8477ba1 Configured Dovecot to log into its own logfile 2016-06-06 08:21:44 -04:00
Michael Kroes 4d7229ccb0 Add documentation on why the notification was removed from the recidive jail 2016-03-26 13:37:33 +01:00
Michael Kroes 454a2b167b Stop fail2ban recidive from sending emails, like all other jails 2016-03-26 09:04:51 +01:00
Joshua Tauberer bc79319864 Merge pull request #494 from anoma/fail2ban-recidive
Activate FAIL2BAN recidive jail
2015-12-22 08:11:19 -05:00
Joshua Tauberer 20e11bbab3 fail2ban: whitelist our machine's public ip address so status checks dont cause bans of the machine itself 2015-12-07 08:45:59 -05:00
anoma ae3ae0b5ba Revert to default FAIL2BAN findtime for SSH jail
I propose that the default 600s/10minute find time is a better test duration for this ban. The altered 120s findtime sounds reasonable until you consider that attackers can simply throttle to 3 attempts per minute and never be banned.

The remaining non default jail settings of maxretry = 7 and bantime = 3600 I believe are good.
2015-09-07 08:36:59 +01:00
anoma 42d657eb54 Unnecessary config item, inherited from default jail.conf 2015-09-07 08:28:54 +01:00
Joshua Tauberer 2c29d59895 Merge pull request #478 from kri3v/patch-1
Added more bantime and lowered max retry attempts
2015-09-05 11:42:36 -04:00
anoma 593fd242bf Activate FAIL2BAN recidive jail
Recidive can be thought of as FAIL2BAN checking itself. This setup will monitor the FAIL2BAN log and if 10 bans are seen within one day activate a week long ban and email the mail in a box admin that it has been applied . These bans survive FAIL2BAN service restarts so are much stronger which obviously means we need to be careful with them.

Our current settings are relatively safe and definitely not easy to trigger by mistake e.g to activate a recidive IP jail by failed SSH logins a user would have to fail logging into SSH  6 times in 10 minutes, get banned, wait for the ban to expire and then repeat this process 9 further times within a 24 hour period.

The default maxretry of 5 is much saner but that can be applied once users are happy with this jail. I have been running a stronger version of this for months and it does a very good job of ejecting persistent abusers.
2015-07-07 12:37:42 +01:00
anoma e591d9082f Ultra safe dovecot findtime and maxretry settings
Explicitly set the timings and counts for the dovecot jail rather than change the global [DEFAULT] and inherit it for this one jail. These settings are far too safe so a future PR should increase security here.
2015-07-06 13:44:53 +01:00
anoma b6f26c0f1e Revert to defaults FAIL2BAN findtime and maxretry
Reverts the remaining FAIL2BAN settings to default: findtime 600 and maxretry 3. As jail settings override default settings this was hardly being used anyway so it is better to explicitly set it per jail as and when required.
2015-07-06 13:42:41 +01:00
kri3v dd0bdef640 Added more bantime and lowered max retry attempts
Ban time was too low for preventing ssh brute force attacks, this change also allows to keep the auth.log more clean and avoid wasting cpu and i/o on this. 

Bots eventually will flag your IP as secure and move along.
2015-07-02 12:55:43 -03:00
anoma b2eaaeca4b Revert to default 6 ssh/ddos login attempts
No legitimate admin will require 20 login attempts. The default 6 is a sane middle ground especially since in 10 minutes they can try again  or immediately from another IP anyway.
2015-07-02 10:23:48 +01:00
anoma e2d9a523c3 Cleanup blank lines, comments and whitespace to make it easier to follow 2015-07-02 10:19:37 +01:00
anoma 11df1e4680 Unnecessary config item, inherited from default jail.conf 2015-07-02 10:10:50 +01:00
anoma 53d5542402 Revert to default 600 second ban time
A 60 second/1 minute ban time is not long enough to counter brute force attacks which is the main purpose of fail2ban for mail in a box. The default bantime of 10 minutes is still sane and I think we have proven fail2ban is reliable enough not to cause problems in general. It is not worth sacrificing security for the rare case where an admin locks themselves out for 10 minutes.
2015-07-02 10:08:50 +01:00
anoma bfda3f40b9 Unnecessary config item, inherited from default jail.conf 2015-07-02 09:55:59 +01:00
H8H c443524ee2 Configure fail2ban jails to prevent dumb brute-force attacks against postfix, dovecot and ssh. See #319 2015-03-08 01:13:55 +01:00