Date: Wed, 29 Jan 2020 11:36:37 +0100 From: Gary Jennejohn <gljennjohn@gmail.com> To: Gordon Bergling via freebsd-hackers <freebsd-hackers@freebsd.org> Cc: Gordon Bergling <gbergling@googlemail.com> Subject: Re: More secure permissions for /root and /etc/sysctl.conf Message-ID: <20200129113637.128890a5@ernst.home> In-Reply-To: <20200129112500.368610e8@ernst.home> References: <20200129092631.GA22505@lion.0xfce3.net> <20200129105325.600cddc1@ernst.home> <20200129112500.368610e8@ernst.home>
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On Wed, 29 Jan 2020 11:25:00 +0100 Gary Jennejohn <gljennjohn@gmail.com> wrote: > On Wed, 29 Jan 2020 10:53:25 +0100 > Gary Jennejohn <gljennjohn@gmail.com> wrote: > > > On Wed, 29 Jan 2020 10:26:31 +0100 > > Gordon Bergling via freebsd-hackers <freebsd-hackers@freebsd.org> wrote: > > > > > Hi, > > > > > > I recently stumbled upon the default world readable permissons of /root and > > > /etc/sysctl.conf. I think that it would be more secure to reduce the default > > > permission for /root to 0700 and to 0600 for /etc/sysctl.conf. > > > > > > I prepared a differtial for the proposed change: > > > https://reviews.freebsd.org/D23392 > > > > > > What do you think? > > > > > > > I think that changing the permissions on / would defeat the purpose of > > /etc/devd.conf and then adding users to certain groups in /etc/group > > to make devices usable without having to escalate to root rights. > > > > I decided to actually test this case, since I thought I should back up > my opinion with some facts. > > So, I did chmod 700 / and rebooted. > > I wasn't able to login as a normal user because an error was raised > about not being able to find the root for audit (or similar wording). > > After changing root back to 755 and remounting /home I could log in. > > Your idea may work if all filesystems are in one big partition, I > can't really say, but on my system /, /var, /usr and /home are > separate partitions/disks. > Never mind. Gordon explained what he really meant. That's what I get for not looking at the differential before responding. Sorry for wasting bandwidth here. -- Gary Jennejohn
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