Date: Mon, 25 Nov 2019 09:15:12 -0600 From: Karl Denninger <karl@denninger.net> To: freebsd-questions@freebsd.org Subject: Re: Geli password over network strategies Message-ID: <070fde61-d128-bae6-b381-75c9a204980b@denninger.net> In-Reply-To: <9dd8e65a-afdd-514f-0dc0-6bb60b9faaab@florencepaul.com> References: <4ac6ee31-ab05-97f6-da4b-c2d798651fdf@florencepaul.com> <9dd8e65a-afdd-514f-0dc0-6bb60b9faaab@florencepaul.com>
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This is a cryptographically signed message in MIME format. --------------ms010800040308080501040806 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable On 11/25/2019 08:45, Paul Florence via freebsd-questions wrote: > Hello everyone, > > I am currently running a home-made server with 12.0-RELEASE-p10 using > full disk geli encryption. When I boot the server, I first have to > type a password to decrypt the whole system. > > However, my ISP is having some power issues and in the last few weeks > I had to go there quite a few times to type a passphrase. > > I would like now to be able to enter my passphrase over the network. > > Would the following boot process be possible ? > > 1. First boot from an unencrypted kernel from a USB stick. > > 2. Then start an SSH server. > > 3. Input my passphrase over an ssh terminal. > > 4. Use the provided passphrase as the geli secret to boot the OS from > the disk > > If no, has anyone had to deal with this kind of problem ? If so, what > kind of strategy did you decide to use ? > Yep.=C2=A0 My infrastructure is UPS backed but UPS batteries run out and = then things shut down.=C2=A0 When power comes back, well, I'd like to be able = to enter that password with REASONABLE security. Here's my strategy for dealing with it. Front-end the server with something that is a dedicated firewall and WILL reboot on power fail and come back to multi-user, normal mode (I use a pcEngines box that boots off SD and runs with root mounted read-only; there is thus essentially zero risk of said box not coming all the way back up unattended.)=C2=A0 It runs StrongSwan. Now from "wherever" I can either ssh or VPN into that after a power failure.=C2=A0 The main box is, at this point, sitting at a console promp= t asking for a GELI password as the loader requires it to unlock the root ZFS pool. I now have choices; I could have the big box set up to go to a serial console and have the serial port plugged in but instead my usual choice is to instead use the existing "big box's" IPKVM feature which I can access via two means -- either over the VPN (since my laptop now appears to be on the local LAN which has the IPKVM port on it) or I can sign into the gateway and use "ssh" to set up a temporary tunnel to the https: port on the IPKVM interface thereby allowing me to directly do a "https://gateway-ip-address:whateverport" and sign into the IPKVM that way, then use its functionality to get direct console access.=C2=A0 Eithe= r way the session is encrypted so the password cannot be picked off. --=20 Karl Denninger karl@denninger.net <mailto:karl@denninger.net> /The Market Ticker/ /[S/MIME encrypted email preferred]/ --------------ms010800040308080501040806 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; 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