105 lines
3.3 KiB
Markdown
105 lines
3.3 KiB
Markdown
# Alpine Initramfs Dropbear
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This script took a huge references from:
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* [https://github.com/Deeplerg/fork-alpine-initramfs-dropbear](https://github.com/Deeplerg/fork-alpine-initramfs-dropbear)
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* [https://github.com/mk-f/alpine-initramfs-dropbear](https://github.com/mk-f/alpine-initramfs-dropbear)
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* [https://gitlab.alpinelinux.org/alpine/mkinitfs/-/blob/master/initramfs-init.in](https://gitlab.alpinelinux.org/alpine/mkinitfs/-/blob/master/initramfs-init.in)
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This script is modified from [alpine/mkinitfs - initramfs-init.in](https://gitlab.alpinelinux.org/alpine/mkinitfs/-/blob/master/initramfs-init.in)
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significant changes:
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* Add dropbear
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* After unlocked, kill all remainings dropbear and nlplug-findfs process, so no struck process reached the system.
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Please install `dropbear` before continuing
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1. copy `dropbear/unlock_disk` to `/etc/dropbear/unlock_disk`
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2. copy `authorized_keys` to `/etc/dropbear/authorized_keys`
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3. copy `features.d` to /`etc/mkinitfs/features.d`
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Note:
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* if you're using Deeplerg/mk-f scripts before don't forget to change `unlock_disk` as i modified that one too.
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* If you're using `grub` make sure to install `syslinux` and possibly checkout `/etc/default/grub` and commented CMDLINE that's conflicted with `update-extlinux` like `GRUB_CMDLINE_LINUX_DEFAULT` and `default_kernel_opts` after that `grub-mkconfig -o /boot/grub/grub.cfg`
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### /etc/mkinitfs.conf
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```
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features="ata base ide scsi usb virtio ext4 cryptsetup keymap dropbear network"
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```
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* features+= `dropbear` `network`
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### /etc/update-extlinux.conf
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```
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modules=sd-mod,usb-storage,ext4,ata_piix,virtio_net,e1000e,virtio_pci
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```
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* if network is not working (/sys/class/net/*/address not found etc.) try adding `e1000e` or `virtio_net` `virtio_pci`
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```
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default_kernel_opts="cryptroot=UUID=xxx cryptdm=root quiet rootfstype=ext4 dropbear=<dropbear_port> ip=<ip>>"
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```
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* ip= can be both static and dhcp(if supported) `ip=<ip>::<gw>:<mask>::<interface>` `ip=dhcp`
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```
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update-extlinux
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```
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```
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mkinitfs -i path/to/initramfs-dropbear <Kernel Version(from /lib/modules) incase in emergency CD>
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```
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## Full Diff:
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```diff
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325a326,340
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> setup_dropbear() {
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> local port="${KOPT_dropbear}"
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> local keys=""
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>
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> # set the unlock_disc script as shell for root
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> sed -i 's|\(root:x:0:0:root:/root:\).*$|\1/etc/dropbear/unlock_disk|' /etc/passwd
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> echo '/etc/dropbear/unlock_disk' > /etc/shells
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>
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> # transfer authorized_keys
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> mkdir /root/.ssh
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> cp /etc/dropbear/authorized_keys /root/.ssh/authorized_keys
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>
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> dropbear -R -E -s -j -k -p $port
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> }
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>
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453c468
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< s390x_net dasd ssh_key BOOTIF zfcp uevent_buf_size aoe aoe_iflist aoe_mtu wireguard"
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---
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> s390x_net dasd ssh_key BOOTIF zfcp uevent_buf_size aoe aoe_iflist aoe_mtu wireguard dropbear"
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581c596,604
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< if [ -n "$KOPT_cryptroot" ]; then
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---
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> if [ -n "$KOPT_dropbear" ]; then
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> if [ -n "$KOPT_cryptroot" ]; then
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> configure_ip
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> setup_dropbear
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> fi
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> fi
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>
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> # Add Workaround for dropbear
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> if [ -n "$KOPT_cryptroot" ] && [ ! -b /dev/mapper/"${KOPT_cryptdm}" ]; then
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645a669,672
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> # Kill all struck nlplug-findfs jobs and dropbear
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> killall -9 nlplug-findfs
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> killall -9 dropbear
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>
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715a743
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>
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733a762,765
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>
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> # Kill all struck nlplug-findfs jobs and dropbear
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> killall -9 nlplug-findfs
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> killall -9 dropbear
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1003c1035
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< reboot
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---
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> reboot
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\ No newline at end of file
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``` |