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Linux 2.6 - man page for pam_tally2 (linux section 8)

PAM_TALLY2(8)				 Linux-PAM Manual			    PAM_TALLY2(8)

NAME
       pam_tally2 - The login counter (tallying) module

SYNOPSIS
       pam_tally2.so [file=/path/to/counter] [onerr=[fail|succeed]] [magic_root] [even_deny_root]
		     [deny=n] [lock_time=n] [unlock_time=n] [root_unlock_time=n] [serialize]
		     [audit] [silent] [no_log_info]

       pam_tally2 [--file /path/to/counter] [--user username] [--reset[=n]] [--quiet]

DESCRIPTION
       This module maintains a count of attempted accesses, can reset count on success, can deny
       access if too many attempts fail.

       pam_tally2 comes in two parts: pam_tally2.so and pam_tally2. The former is the PAM module
       and the latter, a stand-alone program.  pam_tally2 is an (optional) application which can
       be used to interrogate and manipulate the counter file. It can display users' counts, set
       individual counts, or clear all counts. Setting artificially high counts may be useful for
       blocking users without changing their passwords. For example, one might find it useful to
       clear all counts every midnight from a cron job.

       Normally, failed attempts to access root will not cause the root account to become
       blocked, to prevent denial-of-service: if your users aren't given shell accounts and root
       may only login via su or at the machine console (not telnet/rsh, etc), this is safe.

OPTIONS
       GLOBAL OPTIONS
	   This can be used for auth and account module types.

	   onerr=[fail|succeed]
	       If something weird happens (like unable to open the file), return with PAM_SUCCESS
	       if onerr=succeed is given, else with the corresponding PAM error code.

	   file=/path/to/counter
	       File where to keep counts. Default is /var/log/tallylog.

	   audit
	       Will log the user name into the system log if the user is not found.

	   silent
	       Don't print informative messages.

	   no_log_info
	       Don't log informative messages via syslog(3).

       AUTH OPTIONS
	   Authentication phase first increments attempted login counter and checks if user
	   should be denied access. If the user is authenticated and the login process continues
	   on call to pam_setcred(3) it resets the attempts counter.

	   deny=n
	       Deny access if tally for this user exceeds n.

	   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.

	   magic_root
	       If the module is invoked by a user with uid=0 the counter is not incremented. The
	       sysadmin should use this for user launched services, like su, otherwise this
	       argument should be omitted.

	   no_lock_time
	       Do not use the .fail_locktime field in /var/log/faillog for this user.

	   even_deny_root
	       Root account can become unavailable.

	   root_unlock_time=n
	       This option implies even_deny_root option. Allow access after n seconds to root
	       account after failed attempt. If this option is used the root user will be locked
	       out for the specified amount of time after he exceeded his maximum allowed
	       attempts.

	   serialize
	       Serialize access to the tally file using locks. This option might be used only for
	       non-multithreaded services because it depends on the fcntl locking of the tally
	       file. Also it is a good idea to use this option only in such configurations where
	       the time between auth phase and account or setcred phase is not dependent on the
	       authenticating client. Otherwise the authenticating client will be able to prevent
	       simultaneous authentications by the same user by simply artificially prolonging
	       the time the file record lock is held.

       ACCOUNT OPTIONS
	   Account phase resets attempts counter if the user is not magic root. This phase can be
	   used optionally for services which don't call pam_setcred(3) correctly or if the reset
	   should be done regardless of the failure of the account phase of other modules.

	   magic_root
	       If the module is invoked by a user with uid=0 the counter is not changed. The
	       sysadmin should use this for user launched services, like su, otherwise this
	       argument should be omitted.

MODULE TYPES PROVIDED
       The auth and account module types are provided.

RETURN VALUES
       PAM_AUTH_ERR
	   A invalid option was given, the module was not able to retrieve the user name, no
	   valid counter file was found, or too many failed logins.

       PAM_SUCCESS
	   Everything was successful.

       PAM_USER_UNKNOWN
	   User not known.

NOTES
       pam_tally2 is not compatible with the old pam_tally faillog file format. This is caused by
       requirement of compatibility of the tallylog file format between 32bit and 64bit
       architectures on multiarch systems.

       There is no setuid wrapper for access to the data file such as when the pam_tally2.so
       module is called from xscreensaver. As this would make it impossible to share PAM
       configuration with such services the following workaround is used: If the data file cannot
       be opened because of insufficient permissions (EACCES) the module returns PAM_IGNORE.

EXAMPLES
       Add the following line to /etc/pam.d/login to lock the account after 4 failed logins. Root
       account will be locked as well. The accounts will be automatically unlocked after 20
       minutes. The module does not have to be called in the account phase because the login
       calls pam_setcred(3) correctly.

	   auth     required	   pam_securetty.so
	   auth     required	   pam_tally2.so deny=4 even_deny_root unlock_time=1200
	   auth     required	   pam_env.so
	   auth     required	   pam_unix.so
	   auth     required	   pam_nologin.so
	   account  required	   pam_unix.so
	   password required	   pam_unix.so
	   session  required	   pam_limits.so
	   session  required	   pam_unix.so
	   session  required	   pam_lastlog.so nowtmp
	   session  optional	   pam_mail.so standard

FILES
       /var/log/tallylog
	   failure count logging file

SEE ALSO
       pam.conf(5), pam.d(5), pam(8)

AUTHOR
       pam_tally2 was written by Tim Baverstock and Tomas Mraz.

Linux-PAM Manual			    06/04/2011				    PAM_TALLY2(8)


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