47 lines
1.7 KiB
Markdown
47 lines
1.7 KiB
Markdown
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---
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creation date: 2022-07-18
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tags: [ssh,cryptsetup,remote,unlock,crypt]
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---
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# Remote unlocking at boot
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Guide borrowed from https://linux.fernandocejas.com/docs/guides/decrypt-luks-partition-remotely-via-ssh.
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1. Install `pacman -S mkinitcpio-systemd-tool busybox cryptsetup openssh tinyssh tinyssh-convert mc`
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2. Edit `/etc/mkinitcpio.conf`
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```shell
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HOOKS=(.... systemd systemd-tool)
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# find out network device with lspci -k looking for "Kernel driver in use: ..."
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MODULES=(r8169)
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```
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3. Copy _root_ only entry `/etc/fstab` to `/etc/mkinitcpio-systemd-tool/config/fstab`, e.g. with `cat /etc/fstab >> /etc/mkinitcpio-systemd-tool/config/fstab` and remove any unnecessary (non-root) definitions
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4. Copy _cryptsetup_ entries from `/etc/crypttab` to `/etc/mkinitcpio-systemd-tool/config/crypttab`, e.g. with `cat /etc/crypttab >> /etc/mkinitcpio-systemd-tool/config/crypttab`. Remember to set method to `none` (for password ask)
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5. Enable necessary `systemd-tool` services
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```shell
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systemctl enable initrd-cryptsetup.path
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systemctl enable initrd-tinysshd
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systemctl enable initrd-debug-progs
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systemctl enable initrd-sysroot-mount
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```
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6. Adapt `/etc/mkinitcpio-systemd-tool/network/initrd-network.network` to your liking, but ensure that you probably want `eth*` as match for ethernet and you probably want to assign a fixed IP address
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```shell
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[Match]
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Name=eth*
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[Network]
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Address=192.168.1.2/24
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Gateway=192.168.1.1
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DNS=1.1.1.1
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```
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7. Only ED25519 is supported by tinyssh, so ensure to generate one and add the public key to remote's `/root/.ssh/authorized_keys`
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```shell
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ssh-keygen -t ed25519 -C "remote-unlocking-HOSTNAME@local-hostname"
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```
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9. Generate initramfs with `mkinitcpio -P` and watch out for errors, fix them before reboot!
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