Date: Sun, 8 May 2011 09:58:05 +0100 From: Chris Rees <utisoft@gmail.com> To: Jason Hellenthal <jhell@dataix.net> Cc: Jamie Landeg Jones <jamie@bishopston.net>, freebsd-security@freebsd.org, feld@feld.me, Edho P Arief <edhoprima@gmail.com> Subject: Re: Rooting FreeBSD , Privilege Escalation using Jails (P??????tur) Message-ID: <BANLkTi=8by=rtbNUDtA8CRSMJsmgPOR2XA@mail.gmail.com> In-Reply-To: <20110508075203.GA61754@DataIX.net> References: <4DC40E21.6040503@gmail.com> <4DC4102E.8000700@gmail.com> <op.vu2g4b0k34t2sn@tech304> <BANLkTikJgPt4SM_B_7drpgFvO8RkvXaOtw@mail.gmail.com> <201105072231.p47MVktY035491@catflap.bishopston.net> <BANLkTikgnqXB4pdvCd9j9n7pFvg=n5FrdQ@mail.gmail.com> <20110508075203.GA61754@DataIX.net>
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On 8 May 2011 08:52, Jason Hellenthal <jhell@dataix.net> wrote: > > Edho, > > On Sun, May 08, 2011 at 09:15:28AM +0700, Edho P Arief wrote: >> On Sun, May 8, 2011 at 5:31 AM, Jamie Landeg Jones <jamie@bishopston.net> wrote: >> >> All the same, I've sent a PR [1] with some doc patches to make people >> >> more aware of this -- fulfilling my promise of 2+ years ago :S >> >> >> >> Thanks! >> >> >> >> Chris >> >> >> >> [1] http://www.freebsd.org/cgi/query-pr.cgi?pr=156853 >> > >> > Um. Some problems here. >> > >> > A jail won't work for not-root users if the jail root directory is chmod 700 - although >> > there is obviously a 'chroot' running withing the jail, the jailed user still needs >> > to have read permission from the hosts / -- chmod 700 therefore locks all non-root >> > users out. >> > >> >> It's weird - I don't remember having such problem after setting jails' >> root directory permission to 700. I don't have the system anymore so I >> can't verify it just yet. > > It should also be noted here that the jailed root user also has permission > to chmod(1) '/' to anything he or she wants unless you have taken > precaution to not allow that. I would reccoment storing your jails two > levels deep into a directory and chmod(1) 700 the first level to prevent > access from the host and from the jailed root user changing the perms. > Oops, you're absolutely right. I've updated the docs patches (links at [1]), though unfortunately it means it's a little less elegant; I'm reluctant to suggest # chmod 0700 $D/.. in case someone sets $D to /usr/local/myjail or similar... Chris [1] http://www.freebsd.org/cgi/query-pr.cgi?pr=docs/156853
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