2007-10-07 17:14:02 +05:30
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.\" Copyright 1989 - 1994, Julianne Frances Haugh
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. Neither the name of Julianne F. Haugh nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY JULIE HAUGH AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL JULIE HAUGH OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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2007-10-07 17:14:14 +05:30
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.\" $Id: faillog.8,v 1.7 2000/08/26 18:27:17 marekm Exp $
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2007-10-07 17:14:02 +05:30
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.\"
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.TH FAILLOG 8
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.SH NAME
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faillog \- examine faillog and set login failure limits
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.SH SYNOPSIS
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.TP 8
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.B faillog
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.RB [ -u
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.IR login-name ]
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.RB [ -a ]
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.RB [ -t
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.IR days ]
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.RB [ -m
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.IR max ]
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.RB [ -pr ]
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.SH DESCRIPTION
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\fBfaillog\fR formats the contents of the failure log,
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\fI/var/log/faillog\fR, and maintains failure counts and
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limits.
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The order of the arguments to \fBfaillog\fR is significant.
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Each argument is processed immediately in the order given.
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.PP
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The \fB-p\fR flag causes failure entries to be printed in UID
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order.
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Entering \fB-u \fIlogin-name\fR flag will
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cause the failure record for \fIlogin-name\fR only to be printed.
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Entering \fB-t \fIdays\fR will cause only the
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failures more recent than \fIdays\fR to be printed.
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The \fB-t\fR flag overrides the use of \fB-u\fR.
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The \fB-a\fR flag causes all users to be selected.
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When used with the \fB-p\fR flag, this option selects all users
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who have ever had a login failure.
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It is meaningless with the \fB-r\fR flag.
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.PP
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The \fB-r\fR flag is used to reset the count of login failures.
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Write access to \fI/var/log/faillog\fR is required for
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this option.
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Entering \fB-u \fIlogin-name\fR will cause only the failure count
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for \fIlogin-name\fR to be reset.
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.PP
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The \fB-m\fR flag is used to set the maximum number of login
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failures before the account is disabled.
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Write access to \fI/var/log/faillog\fR is required for this
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option.
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Entering \fB-m \fImax\fR will cause all accounts to be disabled
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after \fImax\fR failed logins occur.
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This may be modified with \fB-u \fIlogin-name\fR to limit this
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function to \fIlogin-name\fR only.
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Selecting a \fImax\fR value of 0 has the effect of not placing
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a limit on the number of failed logins.
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The maximum failure count
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should always be 0 for \fBroot\fR to prevent
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a denial of services attack against the system.
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.PP
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Options may be combined in virtually any fashion.
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Each \fB-p\fR, \fB-r\fR, and \fB-m\fR option will cause
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immediate execution using any \fB-u\fR or \fB-t\fR modifier.
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.SH CAVEATS
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\fBfaillog\fR only prints out users with no successful login since
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the last failure.
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To print out a user who has had a successful login since their last
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failure, you must explicitly request the user with the \fB-u\fR flag,
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or print out all users with the \fB-a\fR flag.
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.PP
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Some systems may replace /var/log with /var/adm or /usr/adm.
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.SH FILES
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/var/log/faillog \- failure logging file
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.SH SEE ALSO
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.BR login (1),
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.BR faillog (5)
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.SH AUTHOR
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2007-10-07 17:14:14 +05:30
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Julianne Frances Haugh (jfh@austin.ibm.com)
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