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Full Discussion: block user account after failed password
Top Forums UNIX for Dummies Questions & Answers block user account after failed password Post 302433835 by pludi on Wednesday 30th of June 2010 04:34:47 PM
Old 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

system-auth-ac

SYSTEM-AUTH-AC(5)						File Formats Manual						 SYSTEM-AUTH-AC(5)

NAME

       system-auth-ac,	password-auth-ac,  smartcard-auth-ac, fingerprint-auth-ac, postlogin-ac - Common configuration files for PAMified services
       written by authconfig(8)

SYNOPSIS

       /etc/pam.d/system-auth-ac

DESCRIPTION

       The purpose of this configuration file is to provide common configuration file  for  all  applications  and  service  daemons  calling  PAM
       library.

       The system-auth configuration file is included from all individual service configuration files with the help of the include directive. When
       authconfig(8) writes the system PAM configuration file it replaces the default system-auth file with a symlink pointing	to  system-auth-ac
       and writes the configuration to this file. The symlink is not changed on subsequent configuration changes even if it points elsewhere. This
       allows system administrators to override the configuration written by authconfig.

       The  authconfig	now  writes  the  authentication  modules  also  into  additional  PAM	configuration  files  /etc/pam.d/password-auth-ac,
       /etc/pam.d/smartcard-auth-ac, and /etc/pam.d/fingerprint-auth-ac.  These configuration files contain only modules which perform authentica-
       tion with the respective kinds of authentication tokens.  For example /etc/pam.d/smartcard-auth[-ac] will not contain pam_unix and pam_ldap
       modules and /etc/pam.d/password-auth[-ac] will not contain pam_pkcs11 and pam_fprintd modules.

       The  file  /etc/pam.d/postlogin-ac  contains  common services to be invoked after login. An example can be a module that encrypts an user's
       filesystem or user's keyring and is decrypted by his password.

       The PAM configuration files of services which are accessed by remote connections such as sshd or ftpd now include the  /etc/pam.d/password-
       auth configuration file instead of /etc/pam.d/system-auth.

EXAMPLE

       Configure  system  to  use  pam_tally2  for  configuration  of maximum number of failed logins. Also call pam_access to verify if access is
       allowed.

       Make system-auth symlink point to system-auth-local which contains:

       auth	       requisite       pam_access.so
       auth	       requisite       pam_tally2.so deny=3 lock_time=30 
					     unlock_time=3600
       auth	       include	       system-auth-ac
       account	       required        pam_tally2.so
       account	       include	       system-auth-ac
       password        include	       system-auth-ac
       session	       include	       system-auth-ac

BUGS

       None known.

SEE ALSO

       authconfig(8), authconfig-gtk(8), pam(8), system-auth(5)

Red Hat, Inc.							   2010 March 31						 SYSTEM-AUTH-AC(5)
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