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base: initramfs-framework: merge pkcs11/tpm2 cryptfs implementation
Create a single module (cryptfs) that takes care of the shared logic and support pkcs11 / tpm2.0 via function hooks. Signed-off-by: Ricardo Salveti <[email protected]>
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meta-lmp-base/recipes-core/initrdscripts/initramfs-framework/cryptfs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,134 @@ | ||
| #!/bin/sh | ||
| # Copyright (C) 2022 Fondries.IO | ||
| # SPDX-License-Identifier: MIT | ||
| # | ||
| # Encrypt (reencrypt) root device with LUKS2 | ||
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| cryptfs_enabled() { | ||
| return 0 | ||
| } | ||
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| e2fsck_check() { | ||
| if [ -n "`which e2fsck`" ]; then | ||
| fsckout=`e2fsck -p -v ${1}` | ||
| fsckret=$? | ||
| # Avoid empty newline after summary | ||
| echo "e2fsck: ${fsckout}" >/dev/kmsg | ||
| # Return code >= 4 means uncorrected / operational error | ||
| ## TODO: force boot into a recovery mode or similar, as there is really not | ||
| ## much we can do in case the fs is corrupted in a bad way | ||
| if [ "${fsckret}" -ge "4" ]; then | ||
| echo "e2fsck: WARNING: file system errors left uncorrected: ret ${fsckret}" >/dev/kmsg | ||
| fi | ||
| fi | ||
| } | ||
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| cryptfs_gen_passphrase() { | ||
| # Static as at this point we just need a key for encrypting and later enrolling a new keyslot | ||
| mkdir -p /run/cryptsetup | ||
| echo -n "fiopassphrase" > /run/cryptsetup/passphrase | ||
| } | ||
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| cryptfs_run() { | ||
| # Similar to rootfs, we need to wait for the device to become available | ||
| C=0 | ||
| delay=${bootparam_rootdelay:-1} | ||
| timeout=${bootparam_roottimeout:-5} | ||
| while true; do | ||
| if [ $(( $C * $delay )) -gt $timeout ]; then | ||
| fatal "root '$bootparam_root' doesn't exist or does not contain a /dev." | ||
| fi | ||
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| if [ -n "$bootparam_root" ]; then | ||
| root_dev="$bootparam_root" | ||
| if [ "`echo ${bootparam_root} | cut -c1-5`" = "UUID=" ]; then | ||
| root_uuid=`echo $bootparam_root | cut -c6-` | ||
| root_dev=`readlink -f /dev/disk/by-uuid/$root_uuid` | ||
| elif [ "`echo ${bootparam_root} | cut -c1-9`" = "PARTUUID=" ]; then | ||
| root_partuuid=`echo $bootparam_root | cut -c10-` | ||
| root_dev=`readlink -f /dev/disk/by-partuuid/$root_partuuid` | ||
| elif [ "`echo ${bootparam_root} | cut -c1-10`" = "PARTLABEL=" ]; then | ||
| root_partlabel=`echo $bootparam_root | cut -c11-` | ||
| root_dev=`readlink -f /dev/disk/by-partlabel/$root_partlabel` | ||
| elif [ "`echo ${bootparam_root} | cut -c1-6`" = "LABEL=" ]; then | ||
| root_label=`echo $bootparam_root | cut -c7-` | ||
| root_dev=`readlink -f /dev/disk/by-label/$root_label` | ||
| fi | ||
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| [ -e "$root_dev" ] && break | ||
| fi | ||
| debug "Sleeping for $delay second(s) to wait root to settle..." | ||
| sleep $delay | ||
| C=$(( $C + 1 )) | ||
| done | ||
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| flags="" | ||
| if [ -n "$bootparam_rootflags" ]; then | ||
| flags="$flags -o$bootparam_rootflags" | ||
| fi | ||
| if [ -n "$bootparam_rootfstype" ]; then | ||
| flags="$flags -t$bootparam_rootfstype" | ||
| fi | ||
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| # Identify desired token format (e.g. pkcs11, tpm2, etc) and import required functions | ||
| [ ! -d /etc/cryptfs ] && fatal "No initramfs cryptfs module found" | ||
| luks_token=`ls /etc/cryptfs | head -n1` | ||
| [ -z "${luks_token}" ] && fatal "No valid initramfs cryptfs module found" | ||
| . /etc/cryptfs/${luks_token} | ||
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| cryptfs_check_${luks_token} | ||
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| cryptfs_gen_passphrase | ||
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| if ! cryptsetup isLuks ${root_dev}; then | ||
| # Partition not yet encrypted | ||
| msg "${root_dev} not yet encrypted, encrypting with LUKS2" | ||
| e2fsck_check ${root_dev} | ||
| block_size=`dumpe2fs -h ${root_dev} 2>/dev/null | grep "^Block size" | cut -d ':' -f 2 | tr -d ' '` | ||
| block_count=`dumpe2fs -h ${root_dev} 2>/dev/null | grep "^Block count" | cut -d ':' -f 2 | tr -d ' '` | ||
| luks_size=33554432 # 32M | ||
| new_block_count=$(($block_count - $luks_size / $block_size)) | ||
| resize2fs -p ${root_dev} ${new_block_count} | ||
| if [ $? -ne 0 ]; then | ||
| fatal "Failed to resize ${root_dev} to allow extra size required for luks support" | ||
| fi | ||
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| cat /run/cryptsetup/passphrase | cryptsetup -v reencrypt --encrypt --disable-locks --reduce-device-size 32m ${root_dev} | ||
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| # Align label and UUID if used as boot parameter (not safe, better use the proper device path instead) | ||
| if [ -n "$root_label" ]; then | ||
| cryptsetup config --label ${root_label} ${root_dev} | ||
| fi | ||
| if [ -n "$root_uuid" ]; then | ||
| yes | cryptsetup luksUUID --uuid ${root_uuid} ${root_dev} | ||
| fi | ||
| fi | ||
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| luks_name="`basename ${root_dev}`_crypt" | ||
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| # Check if online encryption is still in progress | ||
| if cryptsetup luksDump ${root_dev} | grep -q "online-reencrypt"; then | ||
| # Run recovery process | ||
| cat /run/cryptsetup/passphrase | cryptsetup luksOpen ${root_dev} ${luks_name} | ||
| e2fsck_check /dev/mapper/${luks_name} | ||
| cat /run/cryptsetup/passphrase | cryptsetup -v reencrypt --resume-only ${root_dev} | ||
| cryptsetup close ${luks_name} | ||
| fi | ||
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| cryptfs_pre_${luks_token} | ||
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| if ! cryptsetup luksDump ${root_dev} | grep -q "systemd-${luks_token}"; then | ||
| msg "Enrolling LUKS2 keyslot based on ${luks_token} token" | ||
| cryptfs_enroll_${luks_token} ${root_dev} | ||
| fi | ||
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| ! cryptsetup luksOpen ${root_dev} ${luks_name} && | ||
| fatal "Unable to open the LUKS partition ${root_dev} with the enrolled ${luks_token} token" | ||
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| cryptfs_post_${luks_token} | ||
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| e2fsck_check /dev/mapper/${luks_name} | ||
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| mount ${flags} /dev/mapper/${luks_name} ${ROOTFS_DIR} || | ||
| (cryptsetup luksClose ${luks_name} && fatal "Failed to mount LUKS ${luks_name}") | ||
| } |
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