90 lines
3.1 KiB
Groff
90 lines
3.1 KiB
Groff
.\" opieaccess.5: Manual page describing the /etc/opieaccess file.
|
|
.\"
|
|
.\" Portions of this software are Copyright 1995 by Randall Atkinson and Dan
|
|
.\" McDonald, All Rights Reserved. All Rights under this copyright are assigned
|
|
.\" to the U.S. Naval Research Laboratory (NRL). The NRL Copyright Notice and
|
|
.\" License Agreement applies to this software.
|
|
.\"
|
|
.\" History:
|
|
.\"
|
|
.\" Modified by cmetz for OPIE 2.4. Fixed "0PIE" typo.
|
|
.\" Written at NRL for OPIE 2.0.
|
|
.\"
|
|
.ll 6i
|
|
.pl 10.5i
|
|
.\" @(#)opieaccess.5 2.0 (NRL) 1/10/95
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.lt 6.0i
|
|
.TH OPIEACCESS 5 "January 10, 1995"
|
|
.AT 3
|
|
.SH NAME
|
|
/etc/opieaccess \- OPIE database of trusted networks
|
|
|
|
.SH DESCRIPTION
|
|
The
|
|
.I opieaccess
|
|
file contains a list of networks that are considered trusted by the system as
|
|
far as security against passive attacks is concerned. Users from networks so
|
|
trusted will be able to log in using OPIE responses, but not be required to
|
|
do so, while users from networks that are not trusted will always be required
|
|
to use OPIE responses (the default behavior). This trust allows a site to
|
|
have a more gentle migration to OPIE by allowing it to be non-mandatory for
|
|
"inside" networks while allowing users to choose whether they with to use OPIE
|
|
to protect their passwords or not.
|
|
.sp
|
|
The entire notion of trust implemented in the
|
|
.I opieaccess
|
|
file is a major security hole because it opens your system back up to the same
|
|
passive attacks that the OPIE system is designed to protect you against. The
|
|
.I opieaccess
|
|
support in this version of OPIE exists solely because we believe that it is
|
|
better to have it so that users who don't want their accounts broken into can
|
|
use OPIE than to have them prevented from doing so by users who don't want
|
|
to use OPIE. In any environment, it should be considered a transition tool and
|
|
not a permanent fixture. When it is not being used as a transition tool, a
|
|
version of OPIE that has been built without support for the
|
|
.I opieaccess
|
|
file should be built to prevent the possibility of an attacker using this file
|
|
as a means to circumvent the OPIE software.
|
|
.sp
|
|
The
|
|
.I opieaccess
|
|
file consists of lines containing three fields separated by spaces (tabs are
|
|
properly interpreted, but spaces should be used instead) as follows:
|
|
.PP
|
|
.nf
|
|
.ta \w' 'u
|
|
Field Description
|
|
action "permit" or "deny" non-OPIE logins
|
|
address Address of the network to match
|
|
mask Mask of the network to match
|
|
.fi
|
|
|
|
Subnets can be controlled by using the appropriate address and mask. Individual
|
|
hosts can be controlled by using the appropriate address and a mask of
|
|
255.255.255.255. If no rules are matched, the default is to deny non-OPIE
|
|
logins.
|
|
|
|
.SH SEE ALSO
|
|
.BR ftpd (8)
|
|
.BR login (1),
|
|
.BR opie (4),
|
|
.BR opiekeys (5),
|
|
.BR opiepasswd (1),
|
|
.BR opieinfo (1),
|
|
.BR su (1),
|
|
|
|
.SH AUTHOR
|
|
Bellcore's S/Key was written by Phil Karn, Neil M. Haller, and John S. Walden
|
|
of Bellcore. OPIE was created at NRL by Randall Atkinson, Dan McDonald, and
|
|
Craig Metz.
|
|
|
|
S/Key is a trademark of Bell Communications Research (Bellcore).
|
|
|
|
.SH CONTACT
|
|
OPIE is discussed on the Bellcore "S/Key Users" mailing list. To join,
|
|
send an email request to:
|
|
.sp
|
|
skey-users-request@thumper.bellcore.com
|