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.\" $OpenBSD: skey.5,v 1.2 2003/01/23 08:58:47 jmc Exp $
.\"
.\" Copyright (c) 2002 Todd C. Miller <Todd.Miller@courtesan.com>
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\" 3. The name of the author may not be used to endorse or promote products
.\" derived from this software without specific prior written permission.
.\"
.\" THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
.\" INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
.\" AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
.\" THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
.\" EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
.\" PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
.\" OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
.\" WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
.\" OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
.\" ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
.\"
.Dd May 16, 2002
.Dt SKEY 5
.Os
.Sh NAME
.Nm skey
.Nd one-time password user database
.Sh DESCRIPTION
The
.Pa /etc/skey
directory contains user records for the S/Key one-time password authentication
system.
.Pp
Records take the form of files within
.Pa /etc/skey
where each file is named for the user whose record it contains.
For example,
.Pa /etc/skey/root
would hold root's S/Key record.
.Pp
The mode for
.Pa /etc/skey
should be 01730 and it should be owned by root and group auth.
Individual records within
.Pa /etc/skey
should be owned by the user they describe and be mode 0600.
To access S/Key records, a process must run as group auth.
.Pp
Each record consists of five lines:
.Bl -enum
.It
The name of the user the record describes.
This should be the same as the name of the file.
.It
The hash type used for this entry;
one of md4, md5, sha1, or rmd160.
The default is md5.
.It
The sequence number.
This is a decimal number between one and one thousand.
Each time the user authenticates via S/Key this number is decremented by one.
.It
A seed used along with the sequence number and the six S/Key words to
compute the value.
.It
The value expected from the crunching of the user's seed, sequence number
and the six S/Key words.
When the result matches this value, authentication is considered to have
been successful.
.El
.Sh EXAMPLES
Here is a sample
.Pa /etc/skey
file for root:
.Bd -literal -offset indent
root
md5
99
obsd36521
1f4359a3764b675d
.Ed
.Sh FILES
.Bl -tag -width /etc/skey -compact
.It Pa /etc/skey
.El
.Sh SEE ALSO
.Xr skey 1 ,
.Xr skeyinit 1 ,
.Xr skey 3
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