RHEL6 pam_tally2 lockouts

Wed Jan 26 10:39:31 UTC 2011

The silly bit I was missing was just where those lines should actually
be placed inside /etc/pam.d/sshd.

This works:

auth required pam_sepermit.so
auth required pam_tally2.so deny=3 onerr=fail		<< this line
here
auth include password-auth

account required pam_nologin.so
account required pam_tally2.so				<< this line
here
account include password-auth

Then just run pam_tally2 to see failed logins, and pam_tally2 -u
username -r to unlock the user account if it's locked out.

-----Original Message-----
From: redhat-list-bounces at redhat.com
[mailto:redhat-list-bounces at redhat.com] On Behalf Of Johan Booysen
Sent: 12 January 2011 09:53
To: General Red Hat Linux discussion list
Subject: RE: RHEL6 pam_tally2 lockouts

Hi,

I've tried those settings in /etc/pam.d/sshd, but get the same result:
pam_tally2 does tally up failed logon attempts, but never locks out the
offending user.

FWIW I also tried adding those lines in the login and system-auth files.
When these lines are in the login file, then it behaves exactly the same
as above.  When added to system-auth, pam_tally2 does not tally up
failed logons at all.

I must be missing something really silly somewhere...

Thanks.

-----Original Message-----
From: redhat-list-bounces at redhat.com
[mailto:redhat-list-bounces at redhat.com] On Behalf Of Mr. Paul M. Whitney
Sent: 12 January 2011 00:25
To: General Red Hat Linux discussion list
Subject: Re: RHEL6 pam_tally2 lockouts

Johan,

I have these lines in my /etc/pam.d/sshd file:

auth	required		pam_tally2.so deny=3 onerr=fail
unlock_time=1800

account	required		pam_tally2.so per_user

Cheers,

Paul

On Jan 11, 2011, at 8:11 AM, Johan Booysen wrote:

> Paul - thanks very much for your reply.
> 
> My understanding was that it should go into the /etc/pam.d/system-auth
> file, but I've tried it in the /etc/pam.d/sshd file and it seems to
work
> in terms of logging failed logon attempts in /var/log/tallylog, e.g.
> 
> Login           Failures Latest failure
> test                6    01/11/11 12:04:23
> 
> However, the account does not get locked out after the specified 3
> number of logon attempts mentioned on the following line:
> auth       required     pam_tally2.so deny=3 onerr=fail
> 
> The pam_tally2 man page mentions:
> 
> deny=n	Deny access if tally for this user exceeds n.
> 
> Anyone have any idea why the account doesn't get locked?
> 
> Regards,
> 
> Johan
> 
> -----Original Message-----
> From: redhat-list-bounces at redhat.com
> [mailto:redhat-list-bounces at redhat.com] On Behalf Of Mr. Paul M.
Whitney
> Sent: 10 January 2011 17:50
> To: General Red Hat Linux discussion list
> Subject: Re: RHEL6 pam_tally2 lockouts
> 
> Have you tried putting the entries in /etc/pam.d/ssh instead of
> system-auth?
> 
> 
> Paul W.
> 
> 
> On Jan 10, 2011, at 10:40, Johan Booysen <johan at matrixsolutions.co.uk>
> wrote:
> 
>> I'm trying to set up a RHEL6 server for sftp access only.  So far it
>> works very well, but I can't seem to get pam_tally2 set up to lock
> user
>> accounts after so many unsuccessful login attempts.
>> 
>> 
>> 
>> As far as I could find out, it should work if I add the following
> lines
>> to /etc/pam.d/system-auth:
>> 
>> 
>> 
>> Last line in the auth section:
>> 
>> auth        required      pam_tally2.so deny=3 onerr=fail
>> 
>> 
>> 
>> Last line in the account section:
>> 
>> account     required      pam_tally2.so
>> 
>> 
>> 
>> According to the pam_tally2 man page this should log failed attempts
> in
>> /var/log/tallylog, but when I deliberately log in with nonsense
>> usernames/password, I get absolutely nothing in the tallylog file.
>> Hence running the pam_tally2 command with no options produces no
>> results.
>> 
>> 
>> 
>> /var/log/secure shows me entries such as:
>> 
>> 
>> 
>> Jan 10 15:16:26 rhel6 sshd[1918]: Failed password for test from
>> 192.x.x.x port 4467 ssh2
>> 
>> Jan 10 15:16:29 rhel6 sshd[1918]: Failed password for test from
> 192.x.x.
>> port 4467 ssh2
>> 
>> Jan 10 15:16:29 rhel6 sshd[1919]: Disconnecting: Too many
> authentication
>> failures for test
>> 
>> Jan 10 15:16:29 rhel6 sshd[1918]: PAM 1 more authentication failure;
>> logname= uid=0 euid=0 tty=ssh ruser= rhost=mc23.xxxxx.int  user=test
>> 
>> 
>> 
>> In /etc/ssh/sshd_config I've got
>> 
>> 
>> 
>> UsePAM yes
>> 
>> PasswordAuthentication yes
>> 
>> ChallengeResponseAuthentication no
>> 
>> 
>> 
>> I might be missing something silly here, so I'd really appreciate any
>> advice on getting this to work on Red Hat Enterprise Linux 6.
>> 
>> 
>> 
>> Thanks.
>> 
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