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