06-30-2010
From the man page of pam_tally
Quote:
lock_time=n
Always deny for n seconds after failed attempt.
unlock_time=n
Allow access after n seconds after failed attempt. If this option is used the user will be locked out for the specified amount of time after he exceeded his maximum allowed attempts. Otherwise the account is locked until the lock is removed by a manual intervention of the system administrator.
In my interpretation (tho I'm not sure) this means that lock_time will block access for a certain time after
each failed attempt, which would be useful to slow down a brute-force attack. unlock_time, however, sets the time until an account is automatically unlocked after the maximum number of tries.
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LEARN ABOUT CENTOS
pam_deny
PAM_DENY(8) Linux-PAM Manual PAM_DENY(8)
NAME
pam_deny - The locking-out PAM module
SYNOPSIS
pam_deny.so
DESCRIPTION
This module can be used to deny access. It always indicates a failure to the application through the PAM framework. It might be suitable
for using for default (the OTHER) entries.
OPTIONS
This module does not recognise any options.
MODULE TYPES PROVIDED
All module types (account, auth, password and session) are provided.
RETURN VALUES
PAM_AUTH_ERR
This is returned by the account and auth services.
PAM_CRED_ERR
This is returned by the setcred function.
PAM_AUTHTOK_ERR
This is returned by the password service.
PAM_SESSION_ERR
This is returned by the session service.
EXAMPLES
#%PAM-1.0
#
# If we don't have config entries for a service, the
# OTHER entries are used. To be secure, warn and deny
# access to everything.
other auth required pam_warn.so
other auth required pam_deny.so
other account required pam_warn.so
other account required pam_deny.so
other password required pam_warn.so
other password required pam_deny.so
other session required pam_warn.so
other session required pam_deny.so
SEE ALSO
pam.conf(5), pam.d(5), pam(8)
AUTHOR
pam_deny was written by Andrew G. Morgan <morgan@kernel.org>
Linux-PAM Manual 09/19/2013 PAM_DENY(8)