[SSSD-users] pam_sss logging and fail2ban
Sumit Bose
sbose at redhat.com
Thu Jan 29 08:47:33 UTC 2015
On Wed, Jan 28, 2015 at 03:11:15PM -0700, Orion Poplawski wrote:
> I'm looking for some help with this problem. I'd like to have fail2ban block
> systems trying to authenticate via smtp or imap. However, for known users I get:
>
> Jan 28 13:33:36 mail auth: pam_unix(dovecot:auth): authentication failure;
> logname= uid=0 euid=0 tty=dovecot ruser=frank rhost=189.22.108.130
> user=known_user
> Jan 28 13:33:37 mail auth: pam_sss(dovecot:auth): authentication failure;
> logname= uid=0 euid=0 tty=dovecot ruser=frank rhost=189.22.108.130 user=known_user
>
> and for unknown users I get:
>
> Jan 28 13:27:16 mail auth: pam_unix(dovecot:auth): authentication failure;
> logname= uid=0 euid=0 tty=dovecot ruser=unknown_user rhost=189.22.108.130
>
> so I can't key off of the pam_unix messages because that will lock out known
> users, and keying off of pam_sss will only block attacks that guess a correct
> username. Is there some way I can get pam_sss to log the unknown user attempts?
How does your full pam configuration looks like. E.g. on Fedora I have a
auth requisite pam_succeed_if.so uid >= 1000 quiet_success
line between pam_unix and pam_sss. Since the user is not known it will
not have a uid and not go pass this line.
HTH
bye,
Sumit
>
> --
> Orion Poplawski
> Technical Manager 303-415-9701 x222
> NWRA, Boulder/CoRA Office FAX: 303-415-9702
> 3380 Mitchell Lane orion at nwra.com
> Boulder, CO 80301 http://www.nwra.com
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