Something changed at some point since Fedora 11, and now some messages from userspace daemons include kernel timestamps in their syslog text, e.g.
Sep 25 12:51:04 myhost kernel: [773580.832329] sshd: Invalid user pgsql from 184.108.40.206
Unfortunately fail2ban does not recognise this extra 'kernel: \[\d+\.\d+\]' text, which means that it fails to detect sshd brute force attacks, and probably many other kinds of attacks.
Seen on Fedora 15 with fail2ban-0.8.4-27.fc15.noarch
Steps to Reproduce:
1. Install fail2ban on F15
2. Configure sshd jail and start fail2ban service
3. Simulate sshd attack by ssh'ing to machine with non-existent user names multiple times
fail2ban takes no action
fail2ban should ban IP from which ssh attempts originate.
I have submitted a bug and patch upstream (sourceforge) to fix this:
but it doesn't look like fail2ban's sourceforge project is being maintained very actively. On github I found a more active git-svn clone of the sourceforge svn repo, forked that, and patched it:
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