heads/initrd/bin/kexec-seal-key
Thierry Laurion 536f4a1623
Small cosmetic/typo related changes, ccache enablement for coreboot and reduction of unseal attempts
gui-init: do not consume two unseal attempt to unseal both totp and hotp + cosmetic changes (slow down TPM DA lockout)
kexec-seal-key: Add DEBUG statement for PCR precalc
seal-totp: add DEBUG statements regarding skipping of PCR5 and PCR6 involvement into TOTP/HOTP sealing ops
seal-hotpkey: Add DEBUG statements related to reuse of TOTP sealed secret
tpmr: add DO_WITH_DEBUG calls to output pcrread and extend calls
tpmr: typo correction stating TRACE calls for tpm2 where it was for tpm1
tpmr: add DO_WITH_DEBUG calls for calcfuturepcr
functions: Cosmetic fix on pause_recovery asking user to press Enter to go to recovery shell on host console when board defines CONFIG_BOOT_RECOVERY_SERIAL

Not so related but part of output review and corrections:
kexec-insert-key: cosmetic changes prepending "+++" to disk related changes
kexec-save-default: cosmetic changes prepending "+++" to disk related changes
config/coreboot-qemu-tpm*.config: add ccache support for faster coreboot rebuild times
2023-03-10 12:11:57 -05:00

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#!/bin/bash
# This will generate a disk encryption key and seal / ecncrypt
# with the current PCRs and then store it in the TPM NVRAM.
# It will then need to be bundled into initrd that is booted.
set -e -o pipefail
. /etc/functions
TPM_INDEX=3
TPM_SIZE=312
KEY_FILE="/tmp/secret/secret.key"
TPM_SEALED="/tmp/secret/secret.sealed"
RECOVERY_KEY="/tmp/secret/recovery.key"
. /etc/functions
. /tmp/config
TRACE "Under kexec-seal-key"
paramsdir=$1
if [ -z "$paramsdir" ]; then
die "Usage $0 /boot"
fi
KEY_DEVICES="$paramsdir/kexec_key_devices.txt"
KEY_LVM="$paramsdir/kexec_key_lvm.txt"
if [ ! -r "$KEY_DEVICES" ]; then
die "No devices defined for disk encryption"
fi
if [ -r "$KEY_LVM" ]; then
# Activate the LVM volume group
VOLUME_GROUP=`cat $KEY_LVM`
if [ -z "$VOLUME_GROUP" ]; then
die "No LVM volume group defined for activation"
fi
lvm vgchange -a y $VOLUME_GROUP \
|| die "$VOLUME_GROUP: unable to activate volume group"
fi
DEBUG "$(pcrs)"
# LUKS Key slot 0 is the manual recovery pass phrase
# that they user entered when they installed OS,
# key slot 1 is the one that we've generated.
read -s -p "Enter disk recovery key: " disk_password
echo -n "$disk_password" > "$RECOVERY_KEY"
echo
read -s -p "New disk unlock password for booting: " key_password
echo
read -s -p "Repeat unlock code: " key_password2
echo
if [ "$key_password" != "$key_password2" ]; then
die "Key passwords do not match"
fi
# Generate key file
dd \
if=/dev/urandom \
of="$KEY_FILE" \
bs=1 \
count=128 \
2>/dev/null \
|| die "Unable to generate 128 random bytes"
# Remove all the old keys from slot 1
for dev in `cat "$KEY_DEVICES" | cut -d\ -f1`; do
echo "++++++ $dev: Removing old key slot"
cryptsetup luksKillSlot \
--key-file "$RECOVERY_KEY" \
$dev 1 \
|| warn "$dev: ignoring problem"
echo "++++++ $dev: Adding key"
cryptsetup luksAddKey \
--key-file "$RECOVERY_KEY" \
--key-slot 1 \
$dev "$KEY_FILE" \
|| die "$dev: Unable to add key"
done
# Now that we have setup the new keys, measure the PCRs
# We don't care what ends up in PCR 6; we just want
# to get the /tmp/luksDump.txt file. We use PCR16
# since it should still be zero
cat "$KEY_DEVICES" | cut -d\ -f1 | xargs /bin/qubes-measure-luks \
|| die "Unable to measure the LUKS headers"
pcrf="/tmp/secret/pcrf.bin"
tpmr pcrread 0 "$pcrf"
tpmr pcrread -a 1 "$pcrf"
tpmr pcrread -a 2 "$pcrf"
tpmr pcrread -a 3 "$pcrf"
# Note that PCR 4 needs to be set with the "normal-boot" path value, which is 0.
dd if=/dev/zero bs="$(tpmr pcrsize)" count=1 status=none >> "$pcrf"
if [ "$CONFIG_USB_KEYBOARD" = "y" -o -r /lib/modules/libata.ko -o -x /bin/hotp_verification ]; then
DEBUG "Sealing TPM disk unlock key with PCR5 involvement (additional kernel modules are loaded per board config)..."
# Here, we take pcr 5 into consideration if modules are expected to be measured+loaded
tpmr pcrread -a 5 "$pcrf"
else
DEBUG "Sealing TPM disk unlock key with PCR5=0 (NO additional kernel modules are loaded per board config)..."
#no kernel modules are expected to be measured+loaded
dd if=/dev/zero bs="$(tpmr pcrsize)" count=1 status=none >> "$pcrf"
fi
# Precompute the value for pcr 6
DEBUG "Precomputing TPM future value for PCR6 sealing/unsealing of TPM disk unlock key..."
tpmr calcfuturepcr -a "/tmp/luksDump.txt" "$pcrf"
# We take into consideration user files in cbfs
tpmr pcrread -a 7 "$pcrf"
DO_WITH_DEBUG --mask-position 7 \
tpmr seal "$KEY_FILE" "$TPM_INDEX" 0,1,2,3,4,5,6,7 "$pcrf" \
"$TPM_SIZE" "$key_password"
# should be okay if this fails
shred -n 10 -z -u "$pcrf".* 2> /dev/null || true
shred -n 10 -z -u "$KEY_FILE" 2> /dev/null \
|| warn "Failed to delete key file - continuing"
cp /tmp/luksDump.txt "$paramsdir/kexec_lukshdr_hash.txt" \
|| warn "Failed to have hashes of LUKS header - continuing"