I am having trouble with a configuration line in
common-auth-pc that denies also root access:
account required pam_tally2.so deny=10 onerr=fail unlock_time=600 even_deny_root root_unlock_time=5 file=/home/log/faillog
It seems that this line causes some problem when trying to access multiple times the SUT and i assume that it things that it is an attack via ssh. But it is actually a test tool that tries to send several times commands via ssh root@ to the SUT (100.100.100.100) from server (10.10.10.13).
Apr 25 05:51:56 SUT sshd: pam_tally2(sshd:auth): user root (0) tally 83, deny 10 Apr 25 05:52:16 SUT sshd: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=10.10.10.13 user=root Apr 25 05:52:21 SUT sshd: error: PAM: Authentication failure for root from 10.10.10.13 Apr 25 05:52:21 SUT sshd: Connection closed by 10.10.10.13 [preauth]
Since the password is always correct, but still after some time it starts to through exception (pexpect) Account locked.
version: 2.3 ($Revision: 399 $) command: /usr/bin/ssh args: ['/usr/bin/ssh', 'firstname.lastname@example.org'] searcher: searcher_re: 0: re.compile(".*:~ #") buffer (last 100 chars): : Account locked due to 757 failed logins Password: before (last 100 chars): : Account locked due to 757 failed logins Password: after: <class 'pexpect.TIMEOUT'> ...
But according to passwd root is not LK labeled:
SUT:~ # passwd -S root root P 04/24/2017 -1 -1 -1 -1
Manually it is always possible to access the SUT via ssh root@!!!
So, for the moment the only that can cause this is the pam configuration. But how do i restart or activate the changes?
Does someone else have any other idea?
Thanks in adv.