9fans - fans of the OS Plan 9 from Bell Labs
 help / color / mirror / Atom feed
* Re: permissions idea (Re: [9fans] on the topic of viruses)
@ 2001-10-02 15:37 presotto
  0 siblings, 0 replies; 7+ messages in thread
From: presotto @ 2001-10-02 15:37 UTC (permalink / raw)
  To: 9fans

[-- Attachment #1: Type: text/plain, Size: 203 bytes --]

Create two groups:

friends
acquaintances

then create the file

> file
chgrp -o friends file
chgrp acquaintances file
chmod 640 file

Make yourself the leader of friends and acquaintances.

[-- Attachment #2: Type: message/rfc822, Size: 2223 bytes --]

From: Matthew Hannigan <mlh@zip.com.au>
To: 9fans@cse.psu.edu
Subject: Re: permissions idea (Re: [9fans] on the topic of viruses)
Date: Tue, 02 Oct 2001 17:11:08 +0200
Message-ID: <3BB9D90C.C27A64E3@zip.com.au>



"Douglas A. Gwyn" wrote:
> 
> Matthew Hannigan wrote:
> > ... perhaps we could have ...
> 
> I don't think any scheme with fixed categories of trust
> can suffice for heavy-duty security. ...	

Sure; I was just trying to figure out how
to get the mostest for the leastest.

I still think that my scheme of two groups
solves a large nr of cases.

How does plan9 solve the problem of someone
wanting to allow his close friends having write
access, acquaintances read access and others none?

I had a look at the man page but it seems to
have the same triple as unix.  Or can the
owner be a group?

Regards,
 -Matt

^ permalink raw reply	[flat|nested] 7+ messages in thread
* Re: permissions idea (Re: [9fans] on the topic of viruses)
@ 2001-10-03  1:14 okamoto
  2001-10-04  9:11 ` Douglas A. Gwyn
  0 siblings, 1 reply; 7+ messages in thread
From: okamoto @ 2001-10-03  1:14 UTC (permalink / raw)
  To: 9fans

>Capability-based security is
>an old idea, but there have some recent developments
>that may make it more practical.

I'm still wondering a random number created by a certain computer
program is really random???  :-)

Kenji   -- yes, I'm kidding--



^ permalink raw reply	[flat|nested] 7+ messages in thread
* Re: [9fans] on the topic of viruses
@ 2001-09-28  1:06 dmr
  2001-09-28  9:58 ` Boyd Roberts
  0 siblings, 1 reply; 7+ messages in thread
From: dmr @ 2001-09-28  1:06 UTC (permalink / raw)
  To: 9fans

Thanks for the typo-correction for the URL:

http://www.cs.bell-labs.com/who/dmr/tdvirus.pdf

is indeed the correct current place.  I heard from Duff
that he's content to have it visible.

The topic is somewhat off-topic for Plan 9, but not
by too much, because similar schemes remain plausible
in Plan 9 systems.  Among the small changes to recent
filesystems/protocols is the transmission and maintenance
of a last-modifier UID for files--one of the minor but
useful diagnostic tools that help.

Gwyn's correct, by the way, that AT&T Federal Systems
did do System V/MLS certified to B1 or B2 or so.
This was independent of the McIlroy and Reeds work,
though I'm certain there was consultation.

	Dennis


^ permalink raw reply	[flat|nested] 7+ messages in thread

end of thread, other threads:[~2001-10-04  9:11 UTC | newest]

Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2001-10-02 15:37 permissions idea (Re: [9fans] on the topic of viruses) presotto
  -- strict thread matches above, loose matches on Subject: below --
2001-10-03  1:14 okamoto
2001-10-04  9:11 ` Douglas A. Gwyn
2001-09-28  1:06 [9fans] on the topic of viruses dmr
2001-09-28  9:58 ` Boyd Roberts
2001-10-01 16:13   ` permissions idea (Re: [9fans] on the topic of viruses) Matthew Hannigan
2001-10-01 16:18     ` Matthew Hannigan
2001-10-02  8:34     ` Douglas A. Gwyn
2001-10-02 15:11       ` Matthew Hannigan

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).