Hello,
I've got a machine running 5.4, offering ssh services and running
bruteforce. In my daily security log emails i am seeing entries like:
Nov 7 07:06:55 zeus sshd[24747]: Failed password for illegal user miha from
163.13.111.172 port 56265 ssh2
Nov 7 07:06:58 zeus sshd[24749]: Failed password for illegal user miha from
163.13.111.172 port 56319 ssh2
Nov 7 07:07:01 zeus sshd[24751]: Failed password for root from
163.13.111.172 port 56376 ssh2
Nov 7 07:07:03 zeus sshd[24753]: Failed password for root from
163.13.111.172 port 56418 ssh2
Nov 7 07:07:05 zeus sshd[24757]: Failed password for illegal user simon
from 163.13.111.172 port 56461 ssh2
Nov 7 07:07:08 zeus sshd[24759]: Failed password for illegal user simon
from 163.13.111.172 port 56504 ssh2
Nov 7 07:07:10 zeus sshd[24761]: Failed password for root from
163.13.111.172 port 56543 ssh2
Nov 7 07:07:12 zeus sshd[24763]: Failed password for root from
163.13.111.172 port 56589
...
I know these are automated atempts at entry but i thought bruteforce was
suppose to stop these. In my auth.log i do see the IP being added, but
connections are still allowed. Here's the snipet:
Nov 7 06:54:52 zeus sshd[24687]: fatal: Timeout before authentication for
163.13.111.172
Nov 7 07:06:55 zeus sshd[24747]: Illegal user miha from 163.13.111.172
Nov 7 07:06:55 zeus sshd[24747]: Failed password for illegal user miha from
163.13.111.172 port 56265 ssh2
163.13.111.172 was logged with total count of 1.
Nov 7 07:06:58 zeus sshd[24749]: Illegal user miha from 163.13.111.172
Nov 7 07:06:58 zeus sshd[24749]: Failed password for illegal user miha from
163.13.111.172 port 56319 ssh2
163.13.111.172 was logged with total count of 2.
Nov 7 07:07:01 zeus sshd[24751]: Failed password for root from
163.13.111.172 port 56376 ssh2
163.13.111.172 was logged with total count of 3.
Nov 7 07:07:03 zeus sshd[24753]: Failed password for root from
163.13.111.172 port 56418 ssh2
IP 163.13.111.172 reached the maximum number of failed attempts!!!
Adding IP to the firewall...
Nov 7 07:07:05 zeus sshd[24757]: Illegal user simon from 163.13.111.172
Nov 7 07:07:05 zeus sshd[24757]: Failed password for illegal user simon
from 163.13.111.172 port 56461 ssh2
Nov 7 07:07:08 zeus sshd[24759]: Illegal user simon from 163.13.111.172
Nov 7 07:07:08 zeus sshd[24759]: Failed password for illegal user simon
from 163.13.111.172 port 56504 ssh2
Nov 7 07:07:10 zeus sshd[24761]: Failed password for root from
163.13.111.172 port 56543 ssh2
Checking my bruteforce table ;i see 163.13.111.172/32 in it, so it was
added, but i don't get why future connections were permitted unless pf was
not restarted or informed about the updated table. In my pf.conf file i
have:
table <bruteforce> persist file "/etc/bruteforce"
set block-policy drop
block in log quick on $ext_if inet proto tcp from <bruteforce> to any port
ssh
Any help appreciated.
Thanks.
Dave.
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