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Date:      Sun, 27 May 2001 12:17:11 -0500
From:      Mike Meyer <mwm@mired.org>
To:        "Lim Seng Chor" <Lim.Seng.Chor@sit.edu.my>
Cc:        questions@freebsd.org, jbiquez@icsmx.com
Subject:   Re: Advice on ISP services Please.
Message-ID:  <15121.13975.857231.124547@guru.mired.org>
In-Reply-To: <3B11A3FD.6507.AD6F41D@localhost>
References:  <84326547@toto.iv> <3B11A3FD.6507.AD6F41D@localhost>

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Lim Seng Chor <Lim.Seng.Chor@sit.edu.my> types:
> On 27 May 2001, at 9:14, Mike Meyer wrote:
> 
> > Lim Seng Chor <Lim.Seng.Chor@sit.edu.my> types:
> > > On 26 May 2001, at 23:01, Jorge Biquez wrote:
> > > 
> > > 
> > > > - How to restrict the access of FTP to only the specified
> > > > directory 
> > > of
> > > > the user. And that they can not see other users directories. - 
> > > 
> > > try look for chroot'ed ftp (http://ftp.eenet.ee/LDP/HOWTO/mini/FTP-
> > > 6.html) or play around with file/directory permision (if you know
> > > how to play with r, w, and x)
> > 
> > chroot also keeps them out of system directories. You can use group
> > permissions to keep them out of other users directories by putting
> > each user in their own group, and making the directory owned by the
> > group that the public servers run as, mode 750. You can't use
> > file/directory permissions to shut users out of the rest of the
> > system.
> 
> chown -R root.wheel /usr
> chmod 700 /usr
> chmod 700 /var
> chmod 711 /etc
> chmod 711 /

You've just made the system unusable to normal users - nothing in
/usr/bin, /usr/local, and so on can be used by anyone but root. This
is not good.

> place the necessary binaries (compiled with static library)  in 
> /home (not /usr/home), and do chroot..since it is only allow for ftp 
> access. 

If you're going to copy binaries and chroot, there's no need to play
with the permissions at all. chroot restricts users to the subtree
chrooted to, all by itself.

	<mike
--
Mike Meyer <mwm@mired.org>			http://www.mired.org/home/mwm/
Independent WWW/Perforce/FreeBSD/Unix consultant, email for more information.

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