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NAME | SYNOPSIS | DESCRIPTION | OPTIONS | MODULE TYPES PROVIDED | RETURN VALUES | EXAMPLES | FILES | SEE ALSO | AUTHOR | COLOPHON |
PAM_TALLY(8) Linux-PAM Manual PAM_TALLY(8)
pam_tally - The login counter (tallying) module
pam_tally.so [file=/path/to/counter] [onerr=[fail|succeed]]
[magic_root] [even_deny_root_account] [deny=n]
[lock_time=n] [unlock_time=n] [per_user] [no_lock_time]
[no_reset] [audit] [silent] [no_log_info]
pam_tally [--file /path/to/counter] [--user username] [--reset[=n]]
[--quiet]
This module maintains a count of attempted accesses, can reset count
on success, can deny access if too many attempts fail.
pam_tally has several limitations, which are solved with pam_tally2.
For this reason pam_tally is deprecated and will be removed in a
future release.
pam_tally comes in two parts: pam_tally.so and pam_tally. The former
is the PAM module and the latter, a stand-alone program. pam_tally
is an (optional) application which can be used to interrogate and
manipulate the counter file. It can display user 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. The faillog(8) command can be used
instead of pam_tally to to maintain the counter file.
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.
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/faillog.
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 checks if user should be denied access
and if not it increments attempted login counter. Then 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.
no_reset
Don't reset count on successful entry, only decrement.
even_deny_root_account
Root account can become unavailable.
per_user
If /var/log/faillog contains a non-zero
.fail_max/.fail_locktime field for this user then use it
instead of deny=n/ lock_time=n parameter.
no_lock_time
Don't use .fail_locktime filed in /var/log/faillog for this
user.
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 incremented. The sysadmin should use this for user
launched services, like su, otherwise this argument should be
omitted.
no_reset
Don't reset count on successful entry, only decrement.
The auth and account module types are provided.
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.
Add the following line to /etc/pam.d/login to lock the account after
too many failed logins. The number of allowed fails is specified by
/var/log/faillog and needs to be set with pam_tally or faillog(8)
before.
auth required pam_securetty.so
auth required pam_tally.so per_user
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
/var/log/faillog
failure logging file
faillog(8), pam.conf(5), pam.d(5), pam(8)
pam_tally was written by Tim Baverstock and Tomas Mraz.
This page is part of the linux-pam (Pluggable Authentication Modules
for Linux) project. Information about the project can be found at
⟨http://www.linux-pam.org/⟩. If you have a bug report for this manual
page, see ⟨//www.linux-pam.org/⟩. This page was obtained from the
tarball Linux-PAM-1.3.0.tar.gz fetched from
⟨http://www.linux-pam.org/library/⟩ on 2017-07-05. If you discover
any rendering problems in this HTML version of the page, or you
believe there is a better or more up-to-date source for the page, or
you have corrections or improvements to the information in this
COLOPHON (which is not part of the original manual page), send a mail
to man-pages@man7.org
Linux-PAM Manual 04/01/2016 PAM_TALLY(8)