Date: Mon, 20 Jan 2003 16:24:28 -0800 From: "Crist J. Clark" <crist.clark@attbi.com> To: Anthony Schneider <anthony@x-anthony.com> Cc: David Schultz <dschultz@uclink.Berkeley.EDU>, zhuravlev alexander <zaa@ulstu.ru>, Oleg Shevtsov <sat@orion.interexc.com>, security@FreeBSD.ORG Subject: Re: your mail Message-ID: <20030121002428.GF34751@blossom.cjclark.org> In-Reply-To: <20030120235152.GA20708@x-anthony.com> References: <20030120101323.GA371@interexc.com> <20030120102235.GA45357@hp.ulstu.ru> <20030120225609.GB3668@HAL9000.homeunix.com> <20030120235152.GA20708@x-anthony.com>
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On Mon, Jan 20, 2003 at 06:51:52PM -0500, Anthony Schneider wrote:
> statically linked? is /sbin/nologin not a shell script anymore?
It is, but it invokes /bin/sh which is static and calls it with
'-p'.
> On Mon, Jan 20, 2003 at 02:56:09PM -0800, David Schultz wrote:
> > Thus spake zhuravlev alexander <zaa@ulstu.ru>:
> > > On Mon, Jan 20, 2003 at 12:13:23PM +0200, Oleg Shevtsov wrote:
> > > >
> > > > Hi,
> > > > how to give specific user FTP but no shell access?
> > > > Ftpd's manual says:
> > > > 4. The user must have a standard shell returned by
> > > > getusershell(3).
> > > > But I don't want to give shell account.
> > >
> > > /sbin/nologin ?
> >
> > If you do it this way, you need to ensure that either the
> > ``FTP-only'' users do not have home directories or that
> > /sbin/nologin is statically linked (the default). Otherwise, it
> > is possible to exploit a bug (ahem, feature) in OpenSSH to gain
> > shell access on your box.
--
Crist J. Clark | cjclark@alum.mit.edu
| cjclark@jhu.edu
http://people.freebsd.org/~cjc/ | cjc@freebsd.org
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