1 .\" opieaccess.5: Manual page describing the /etc/opieaccess file.
3 .\" Portions of this software are Copyright 1995 by Randall Atkinson and Dan
4 .\" McDonald, All Rights Reserved. All Rights under this copyright are assigned
5 .\" to the U.S. Naval Research Laboratory (NRL). The NRL Copyright Notice and
6 .\" License Agreement applies to this software.
10 .\" Modified by cmetz for OPIE 2.4. Fixed "0PIE" typo.
11 .\" Written at NRL for OPIE 2.0.
15 .\" @(#)opieaccess.5 2.0 (NRL) 1/10/95
16 .\" $FreeBSD: src/contrib/opie/opieaccess.5,v 1.2.8.3 2002/07/15 14:48:43 des Exp $
17 .\" $DragonFly: src/contrib/opie/opieaccess.5,v 1.2 2003/06/17 04:24:05 dillon Exp $
20 .TH OPIEACCESS 5 "January 10, 1995"
23 /etc/opieaccess \- OPIE database of trusted networks
28 file contains a list of networks that are considered trusted by the system as
29 far as security against passive attacks is concerned. Users from networks so
30 trusted will be able to log in using OPIE responses, but not be required to
31 do so, while users from networks that are not trusted will always be required
32 to use OPIE responses (the default behavior). This trust allows a site to
33 have a more gentle migration to OPIE by allowing it to be non-mandatory for
34 "inside" networks while allowing users to choose whether they with to use OPIE
35 to protect their passwords or not.
37 The entire notion of trust implemented in the
39 file is a major security hole because it opens your system back up to the same
40 passive attacks that the OPIE system is designed to protect you against. The
42 support in this version of OPIE exists solely because we believe that it is
43 better to have it so that users who don't want their accounts broken into can
44 use OPIE than to have them prevented from doing so by users who don't want
45 to use OPIE. In any environment, it should be considered a transition tool and
46 not a permanent fixture. When it is not being used as a transition tool, a
47 version of OPIE that has been built without support for the
49 file should be built to prevent the possibility of an attacker using this file
50 as a means to circumvent the OPIE software.
54 file consists of lines containing three fields separated by spaces (tabs are
55 properly interpreted, but spaces should be used instead) as follows:
60 action "permit" or "deny" non-OPIE logins
61 address Address of the network to match
62 mask Mask of the network to match
65 Subnets can be controlled by using the appropriate address and mask. Individual
66 hosts can be controlled by using the appropriate address and a mask of
67 255.255.255.255. If no rules are matched, the default is to deny non-OPIE
80 Bellcore's S/Key was written by Phil Karn, Neil M. Haller, and John S. Walden
81 of Bellcore. OPIE was created at NRL by Randall Atkinson, Dan McDonald, and
84 S/Key is a trademark of Bell Communications Research (Bellcore).
87 OPIE is discussed on the Bellcore "S/Key Users" mailing list. To join,
88 send an email request to:
90 skey-users-request@thumper.bellcore.com