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Date:      Wed, 31 Mar 1999 19:47:04 +0100
From:      Robin Melville <robmel@innotts.co.uk>
To:        Dom Mitchell <Dom.Mitchell@palmerharvey.co.uk>, Rahul Dhesi <dhesi@rahul.net>
Cc:        freebsd-stable@FreeBSD.ORG
Subject:   Re: 'make installworld' makes /var/mail world-not-writable
Message-ID:  <l03130300b3281d08ade5@[172.16.17.20]>
In-Reply-To: <E10SGEX-0005Kj-00@voodoo.pandhm.co.uk>
References:  Rahul Dhesi's message of "Tue, 30 Mar 1999 18:58:49 -0800" <199903310258.AA09076@waltz.rahul.net>

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At 9:20 am +0100 31/3/99, Dom Mitchell wrote:
>On 30 March 1999, Rahul Dhesi proclaimed:
>> "Chad R. Larson" <chad@freebie.dcfinc.com> writes: [...]
>> But what if it's just an NFS client and some other server exports
>> /var/mail to it, and there are a bunch of other clients that all use
>> .lock files on that filesystem?
>>
>> Unlike / and /usr and /etc, which can be considered private to each
>> machine, /var/mail is much more likely to be a global filesystem with a
>> site-wide, not machine-specific, file locking policy and permissions.
>
>Nope.  Anybody using an NFS mounted /var/mail gets what they deserve.
>Use POP3, IMAP and SMTP and stop worrying about things.

Yes, it's seriously bad news to allow NFS access to anything that should
opened by setgid or setuid daemons. Even if rpc.lockd did work in FreeBSD
its a security nightmare. Forward mail to the local MTA, allow remote MUA's
to use the remote protocols. The only way...

Regards

Robin.


----------------------------------------------------------------------
Robin Melville, Addiction Information Services
Nottingham Alcohol & Drug Team
Tel:  +44 (0)115 952 9478       Fax:  +44 (0)115 952 9421
work: robmel@nadt.org.uk        home: robmel@innotts.co.uk
Pages: http://www.innotts.co.uk/~robmel    (home page)
       http://www.innotts.co.uk/nadt       (substance misuse pages)
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