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- Path: sparky!uunet!airs!ian
- From: ian@airs.com (Ian Lance Taylor)
- Newsgroups: comp.mail.uucp
- Subject: Re: What to do about forgeries?
- Message-ID: <5899@airs.com>
- Date: 12 Nov 92 01:55:31 GMT
- References: <1992Nov11.103240.2922@ms.uky.edu>
- Sender: news@airs.com
- Distribution: usa
- Lines: 41
-
- fehr@ms.uky.edu (Jeff Davis) writes:
-
- >We have always run a system based upon trust: a single login,
- >nuucp, for all of our nodes. Everyone has always behaved and
- >no one has pretended to be another node to scarf up another
- >node's mail. Now, we find that we are in need of more security
- >but simply adding more logins doesn't appear to change anything:
- >someone logging in under, say, xuucp still has access to the
- >entire scope of the mail system. Obviously, we don't know
- >squat since this seems to be a fairly elemental question, but
- >how can we prevent a node from pretending to be another node?
- >Or gaining access to mail it shouldn't get? Is it just a question
- >of an after-the-fact check of xferstats? That doesn't really
- >appear to be quite adequate.
-
- I'm going to assume that you are using HDB UUCP, since you mentioned
- the xferstats file.
-
- You need to set up your Permissions file. The semantics are somewhat
- confusing (at least to me). The simple way to do it is for each
- system that calls in, put a line in Permissions that looks like this:
-
- MACHINE=sys LOGNAME=Usys VALIDATE=sys
-
- You can then give READ, WRITE, etc. commands if you wish, although the
- defaults are probably fine. See the man page on Permissions for what
- you can specify.
-
- Use a different LOGNAME for each system. Enter each LOGNAME in
- /etc/passwd with the same uid as nuucp and with a different password
- for each one. Tell the people who call you to start using the new
- login name and password, since nuucp will no longer work.
-
- Then the data routed for each system is secure (from other remote
- systems, not necessarily from local users) so long as nobody else
- finds out their password.
- --
- Ian Taylor | ian@airs.com | First to identify quote wins free e-mail message:
- ``Things are either isolated units, or they form one inseparable whole. If
- that whole be God, then all is well; but if aimless chance, at least you
- need not be aimless also.''
-