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initramfs: source user scripts from /e/z/initramfs-tools-load-key{,.d/*}

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By dropping in a file in a directory (for packages) or by making a file
(for local administrators), custom key loading methods may be provided
for the rootfs and necessities.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Nicholas Morris <security@niwamo.com>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Co-authored-by: Nicholas Morris <security@niwamo.com>
Supersedes: #14704
Closes: #13757
Closes #14733
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наб 2023-04-12 19:08:49 +02:00 committed by GitHub
parent 574e09d8c6
commit 6e015933f8
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3 changed files with 37 additions and 1 deletions
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25
contrib/initramfs/README.md
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@ -78,7 +78,30 @@ To use this feature:
1. Install the `dropbear-initramfs` package. You may wish to uninstall the
`cryptsetup-initramfs` package to avoid warnings.
2. Add your SSH key(s) to `/etc/dropbear-initramfs/authorized_keys`. Note
that Dropbear does not support ed25519 keys before version 2020.79;
that Dropbear does not support ed25519 keys before version 2020.79;
in that case, use RSA (2048-bit or more) instead.
3. Rebuild the initramfs with your keys: `update-initramfs -u`
4. During the system boot, login via SSH and run: `zfsunlock`
### Unlocking a ZFS encrypted root via alternate means
If present, a shell program at `/etc/zfs/initramfs-tools-load-key`
and files matching `/etc/zfs/initramfs-tools-load-key.d/*`
will be copied to the initramfs during generation
and sourced to load the key, if required.
The `$ENCRYPTIONROOT` to load the key for and `$KEYLOCATION` variables are set,
and all initramfs-tools functions are available;
use unquoted `$ZPOOL` and `$ZFS` to run `zpool` and `zfs`.
A successful return (and loaded key) stops the search.
A failure return is non-fatal,
and loading keys proceeds as normal if no hook succeeds.
A trivial example of a key-loading drop-in that uses the BLAKE2 checksum
of the file at the `keylocation` as the key follows.
```sh
key="$(b2sum "${KEYLOCATION#file://}")" || return
printf '%s\n' "${key%% *}" | $ZFS load-key -L prompt "$ENCRYPTIONROOT"
```

3
contrib/initramfs/hooks/zfs.in
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@ -41,6 +41,9 @@ copy_file cache "@sysconfdir@/zfs/zpool.cache"
copy_file config "@initconfdir@/zfs"
copy_file config "@sysconfdir@/zfs/zfs-functions"
copy_file config "@sysconfdir@/zfs/vdev_id.conf"
for f in "@sysconfdir@/zfs/initramfs-tools-load-key" "@sysconfdir@/zfs/initramfs-tools-load-key.d/"*; do
copy_file config "$f"
done
copy_file rule "@udevruledir@/60-zvol.rules"
copy_file rule "@udevruledir@/69-vdev.rules"

10
contrib/initramfs/scripts/zfs
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@ -420,6 +420,16 @@ decrypt_fs()
# Continue only if the key needs to be loaded
[ "$KEYSTATUS" = "unavailable" ] || return 0
# Try extensions first
for f in "/etc/zfs/initramfs-tools-load-key" "/etc/zfs/initramfs-tools-load-key.d/"*; do
[ -r "$f" ] || continue
(. "$f") && {
# Successful return and actually-loaded key: we're done
KEYSTATUS="$(get_fs_value "${ENCRYPTIONROOT}" keystatus)"
[ "$KEYSTATUS" = "unavailable" ] || return 0
}
done
# Do not prompt if key is stored noninteractively,
if ! [ "${KEYLOCATION}" = "prompt" ]; then
$ZFS load-key "${ENCRYPTIONROOT}"