mirror of
https://github.com/linuxboot/heads.git
synced 2024-12-19 04:57:55 +00:00
83a67d2798
fix $GPG_GEN_KEY getting clobbered when using a custom password Signed-off-by: Matt DeVillier <matt.devillier@puri.sm>
410 lines
12 KiB
Bash
Executable File
410 lines
12 KiB
Bash
Executable File
#!/bin/sh
|
|
# Automated setup of TPM, GPG keys, and disk
|
|
|
|
set -o pipefail
|
|
|
|
# use TERM to exit on error
|
|
trap "exit 1" TERM
|
|
export TOP_PID=$$
|
|
|
|
## Static local variables
|
|
|
|
CLEAR="--clear"
|
|
CONTINUE="--yes-button Continue"
|
|
CANCEL="--no-button Cancel"
|
|
HEIGHT="150"
|
|
WIDTH="220"
|
|
|
|
USER_PIN_DEF=123456
|
|
ADMIN_PIN_DEF=12345678
|
|
TPM_PASS_DEF=12345678
|
|
CUSTOM_PASS=""
|
|
|
|
## External files sourced
|
|
|
|
. /etc/functions
|
|
. /tmp/config
|
|
|
|
## functions
|
|
|
|
die() {
|
|
|
|
local msg=$1
|
|
if [ -n "$msg" ]; then
|
|
echo -e "\n$msg"
|
|
fi
|
|
kill -s TERM $TOP_PID
|
|
exit 1
|
|
}
|
|
|
|
whiptail_error()
|
|
{
|
|
local msg=$1
|
|
if [ "$msg" = "" ]; then
|
|
die "whiptail error: An error msg is required"
|
|
fi
|
|
whiptail --msgbox "${msg}\n\n" $WIDTH $HEIGHT $CONFIG_ERROR_BG_COLOR --title "Error"
|
|
}
|
|
|
|
whiptail_error_die()
|
|
{
|
|
whiptail_error "$@"
|
|
die
|
|
}
|
|
|
|
gpg_key_reset()
|
|
{
|
|
GPG_KEY_NAME=`date +%Y%m%d%H%M%S`
|
|
# Factory reset GPG card
|
|
{
|
|
echo admin
|
|
echo factory-reset
|
|
echo y
|
|
echo yes
|
|
} | gpg --command-fd=0 --status-fd=1 --pinentry-mode=loopback --card-edit \
|
|
> /tmp/gpg_card_edit_output 2>/dev/null
|
|
if [ $? -ne 0 ]; then
|
|
ERROR=`cat /tmp/gpg_card_edit_output`
|
|
whiptail_error_die "GPG Key factory reset failed!\n\n$ERROR"
|
|
fi
|
|
# Generate OEM GPG keys
|
|
{
|
|
echo admin
|
|
echo generate
|
|
echo n
|
|
echo ${ADMIN_PIN_DEF}
|
|
echo ${USER_PIN_DEF}
|
|
echo 0
|
|
echo y
|
|
echo "OEM Key"
|
|
echo "oem-${GPG_KEY_NAME}@example.com"
|
|
echo "OEM-generated key"
|
|
} | gpg --command-fd=0 --status-fd=2 --pinentry-mode=loopback --card-edit \
|
|
> /tmp/gpg_card_edit_output 2>/dev/null
|
|
if [ $? -ne 0 ]; then
|
|
ERROR=`cat /tmp/gpg_card_edit_output`
|
|
whiptail_error_die "GPG Key automatic keygen failed!\n\n$ERROR"
|
|
fi
|
|
}
|
|
gpg_key_change_pin()
|
|
{
|
|
# 1 = user PIN, 3 = admin PIN
|
|
PIN_TYPE=$1
|
|
PIN_ORIG=$2
|
|
PIN_NEW=$3
|
|
# Change PIN
|
|
{
|
|
echo admin
|
|
echo passwd
|
|
echo ${PIN_TYPE}
|
|
echo ${PIN_ORIG}
|
|
echo ${PIN_NEW}
|
|
echo ${PIN_NEW}
|
|
echo q
|
|
echo q
|
|
} | gpg --command-fd=0 --status-fd=2 --pinentry-mode=loopback --card-edit \
|
|
> /tmp/gpg_card_edit_output 2>/dev/null
|
|
if [ $? -ne 0 ]; then
|
|
ERROR=`cat /tmp/gpg_card_edit_output`
|
|
whiptail_error_die "GPG Key PIN change failed!\n\n$ERROR"
|
|
fi
|
|
}
|
|
|
|
generate_checksums()
|
|
{
|
|
# ensure /boot mounted
|
|
if ! grep -q /boot /proc/mounts ; then
|
|
mount -o rw /boot || whiptail_error_die "Unable to mount /boot"
|
|
else
|
|
mount -o remount,rw /boot || whiptail_error_die "Unable to mount /boot"
|
|
fi
|
|
|
|
# clear any existing checksums/signatures
|
|
rm /boot/kexec* 2>/dev/null
|
|
|
|
# create Heads TPM counter
|
|
tpm counter_create \
|
|
-pwdo "$TPM_PASS_DEF" \
|
|
-pwdc '' \
|
|
-la -3135106223 \
|
|
| tee /tmp/counter \
|
|
|| whiptail_error_die "Unable to create TPM counter"
|
|
TPM_COUNTER=`cut -d: -f1 < /tmp/counter`
|
|
|
|
# increment TPM counter
|
|
increment_tpm_counter $TPM_COUNTER >/dev/null 2>&1 \
|
|
|| whiptail_error_die "Unable to increment tpm counter"
|
|
|
|
# create rollback file
|
|
sha256sum /tmp/counter-$TPM_COUNTER > /boot/kexec_rollback.txt 2>/dev/null \
|
|
|| whiptail_error_die "Unable to create rollback file"
|
|
|
|
# set default boot option
|
|
set_default_boot_option
|
|
|
|
# generate hashes
|
|
find /boot -type f ! -name '*kexec*' \
|
|
| xargs sha256sum > /boot/kexec_hashes.txt 2>/dev/null \
|
|
|| whiptail_error_die "Error generating kexec hashes"
|
|
|
|
param_files=`find /boot/kexec*.txt`
|
|
[ -z "$param_files" ] \
|
|
&& whiptail_error_die "No kexec parameter files to sign"
|
|
|
|
# sign kexec boot files
|
|
if sha256sum $param_files 2>/dev/null | gpg \
|
|
--pinentry-mode loopback \
|
|
--passphrase "$USER_PIN_DEF" \
|
|
--digest-algo SHA256 \
|
|
--detach-sign \
|
|
-a \
|
|
> /boot/kexec.sig 2>/tmp/error; then
|
|
# successful - update the validated params
|
|
if ! check_config /boot >/dev/null 2>/tmp/error ; then
|
|
cat /tmp/error
|
|
ret=1
|
|
else
|
|
ret=0
|
|
fi
|
|
else
|
|
cat /tmp/error
|
|
ret=1
|
|
fi
|
|
|
|
# done writing to /boot, switch back to RO
|
|
mount -o ro,remount /boot
|
|
|
|
if [ $ret = 1 ] ; then
|
|
ERROR=$(tail -n 1 /tmp/error)
|
|
whiptail_error_die "Error signing kexec boot files:\n\n$ERROR"
|
|
fi
|
|
}
|
|
|
|
set_default_boot_option()
|
|
{
|
|
option_file="/tmp/kexec_options.txt"
|
|
tmp_menu_file="/tmp/kexec/kexec_menu.txt"
|
|
hash_file="/boot/kexec_default_hashes.txt"
|
|
|
|
mkdir -p /tmp/kexec/
|
|
rm $option_file 2>/dev/null
|
|
# parse boot options from grub.cfg
|
|
for i in `find /boot -name "grub.cfg"`; do
|
|
kexec-parse-boot "/boot" "$i" >> $option_file
|
|
done
|
|
[ ! -r $option_file ] \
|
|
&& whiptail_error_die "Failed to parse any boot options"
|
|
|
|
# sort boot options
|
|
sort -r $option_file | uniq > $tmp_menu_file
|
|
|
|
## save first option as default
|
|
entry=`head -n 1 $tmp_menu_file | tail -1`
|
|
|
|
# clear existing default configs
|
|
rm "/boot/kexec_default.*.txt" 2>/dev/null
|
|
|
|
# write new config
|
|
echo "$entry" > /boot/kexec_default.1.txt
|
|
|
|
# validate boot option
|
|
cd /boot && /bin/kexec-boot -b "/boot" -e "$entry" -f \
|
|
| xargs sha256sum > $hash_file 2>/dev/null \
|
|
|| whiptail_error_die "Failed to create hashes of boot files"
|
|
}
|
|
|
|
## main script start
|
|
|
|
# check for args
|
|
if [ "$1" != "" ]; then
|
|
title_text=$1
|
|
else
|
|
title_text="OEM Factory Reset"
|
|
fi
|
|
if [ "$2" != "" ]; then
|
|
bg_color=$2
|
|
else
|
|
bg_color=""
|
|
fi
|
|
|
|
# show warning prompt
|
|
if ! whiptail --yesno "
|
|
This operation will automatically:\n\n
|
|
* ERASE the TPM and reset it with a default password\n
|
|
* ERASE any keys or passwords on the GPG smart card,\n
|
|
reset it to a factory state, and generate new keys\n
|
|
* Add the new GPG key to the firmware and reflash it\n
|
|
* Sign all of the files in /boot with the new GPG key\n\n
|
|
It requires that you already have an OS installed on a\n
|
|
dedicated /boot partition. Do you wish to continue?\n" \
|
|
$WIDTH $HEIGHT $CONTINUE $CANCEL $CLEAR $bg_color --title "$title_text" ; then
|
|
exit 1
|
|
fi
|
|
|
|
# Prompt to change default passwords
|
|
echo -e -n "Would you like to set a custom password? [y/N]: "
|
|
read -n 1 prompt_output
|
|
echo
|
|
if [ "$prompt_output" == "y" \
|
|
-o "$prompt_output" == "Y" ] \
|
|
; then
|
|
echo -e "\nThe custom password will be used for the
|
|
TPM admin and GPG user/admin passwords.
|
|
It must be at least 8 characters in length.\n"
|
|
CUSTOM_PASS=""
|
|
echo
|
|
while [[ ${#CUSTOM_PASS} -lt 8 ]] ; do
|
|
echo -e -n "Enter the custom password: "
|
|
read CUSTOM_PASS
|
|
done
|
|
echo
|
|
TPM_PASS_DEF=$CUSTOM_PASS
|
|
fi
|
|
|
|
## sanity check the USB, GPG key, and boot device before proceeding further
|
|
|
|
# mount USB, then remount rw
|
|
echo -e "\nChecking for USB media...\n"
|
|
# ensure /media not mounted
|
|
umount /media 2>/dev/null
|
|
# mount-usb will detect and prompt if no USB inserted
|
|
if ! mount-usb rw 2>/tmp/error; then
|
|
ERROR=$(tail -n 1 /tmp/error)
|
|
whiptail_error_die "Unable to mount USB on /media:\n\n${ERROR}"
|
|
fi
|
|
|
|
# ensure GPG key connected
|
|
echo -e "\nChecking for GPG Key...\n"
|
|
# USB kernel modules already loaded via mount-usb
|
|
if ! gpg --card-status >/dev/null 2>&1 ; then
|
|
whiptail_error "Can't access GPG Key; remove and reinsert, then press Enter to retry."
|
|
if ! gpg --card-status >/dev/null 2>/tmp/error ; then
|
|
ERROR=$(tail -n 1 /tmp/error)
|
|
whiptail_error_die "Unable to detect GPG Key:\n\n${ERROR}"
|
|
fi
|
|
fi
|
|
|
|
# detect and set /boot device
|
|
echo -e "\nDetecting and setting boot device...\n"
|
|
if ! detect_boot_device ; then
|
|
whiptail_error_die "Unable to locate /boot files on any mounted disk"
|
|
else
|
|
echo -e "Boot device set to $CONFIG_BOOT_DEV\n"
|
|
fi
|
|
|
|
# update configs
|
|
replace_config /etc/config.user "CONFIG_BOOT_DEV" "$CONFIG_BOOT_DEV"
|
|
combine_configs
|
|
|
|
## reset TPM and set default password
|
|
echo -e "\nResetting TPM...\n"
|
|
{
|
|
echo $TPM_PASS_DEF
|
|
echo $TPM_PASS_DEF
|
|
} | /bin/tpm-reset >/dev/null 2>/tmp/error
|
|
if [ $? -ne 0 ]; then
|
|
ERROR=$(tail -n 1 /tmp/error)
|
|
whiptail_error_die "Error resetting TPM:\n\n${ERROR}"
|
|
fi
|
|
|
|
# clear local keyring
|
|
rm /.gnupg/*.gpg 2>/dev/null
|
|
rm /.gnupg/*.kbx 2>/dev/null
|
|
gpg --list-keys >/dev/null 2>&1
|
|
|
|
## reset the GPG Key
|
|
echo -e "\nResetting GPG Key...\n(this will take a minute or two)\n"
|
|
gpg_key_reset
|
|
|
|
# parse name of generated key
|
|
GPG_GEN_KEY=`grep -A1 pub /tmp/gpg_card_edit_output | tail -n1 | sed -nr 's/^([ ])*//p'`
|
|
PUBKEY="/tmp/${GPG_GEN_KEY}.asc"
|
|
|
|
if [ "$CUSTOM_PASS" != "" ]; then
|
|
echo -e "\nChanging default GPG Admin PIN\n"
|
|
gpg_key_change_pin "3" "$ADMIN_PIN_DEF" "$CUSTOM_PASS"
|
|
echo -e "\nChanging default GPG User PIN\n"
|
|
gpg_key_change_pin "1" "$USER_PIN_DEF" "$CUSTOM_PASS"
|
|
USER_PIN_DEF=$CUSTOM_PASS
|
|
ADMIN_PIN_DEF=$CUSTOM_PASS
|
|
fi
|
|
|
|
## export generated key to USB
|
|
echo -e "\nExporting generated key to USB...\n"
|
|
# export pubkey to file
|
|
if ! gpg --export --armor $GPG_GEN_KEY > "${PUBKEY}" 2>/tmp/error ; then
|
|
ERROR=$(tail -n 1 /tmp/error)
|
|
whiptail_error_die "GPG Key gpg export to file failed!\n\n$ERROR"
|
|
fi
|
|
# copy to USB
|
|
if ! cp "${PUBKEY}" "/media/${GPG_GEN_KEY}.asc" 2>/tmp/error ; then
|
|
ERROR=$(tail -n 1 /tmp/error)
|
|
whiptail_error_die "Key export error: unable to copy ${GPG_GEN_KEY}.asc to /media:\n\n$ERROR"
|
|
fi
|
|
umount /media 2>/dev/null
|
|
|
|
## flash generated key to ROM
|
|
echo -e "\nReading current firmware...\n(this will take a minute or two)\n"
|
|
/bin/flash.sh -r /tmp/oem-setup.rom >/dev/null 2>/tmp/error
|
|
if [ ! -s /tmp/oem-setup.rom ]; then
|
|
ERROR=$(tail -n 1 /tmp/error)
|
|
whiptail_error_die "Error reading current firmware:\n\n$ERROR"
|
|
fi
|
|
|
|
# ensure key imported locally
|
|
if ! cat "$PUBKEY" | gpg --import >/dev/null 2>/tmp/error ; then
|
|
ERROR=$(tail -n 1 /tmp/error)
|
|
whiptail_error_die "Error importing GPG key:\n\n$ERROR"
|
|
fi
|
|
# update /.gnupg/trustdb.gpg to ultimately trust all user provided public keys
|
|
if ! gpg --list-keys --fingerprint --with-colons 2>/dev/null \
|
|
| sed -E -n -e 's/^fpr:::::::::([0-9A-F]+):$/\1:6:/p' \
|
|
| gpg --import-ownertrust >/dev/null 2>/tmp/error ; then
|
|
ERROR=$(tail -n 1 /tmp/error)
|
|
whiptail_error_die "Error importing GPG ownertrust:\n\n$ERROR"
|
|
fi
|
|
if ! gpg --update-trust >/dev/null 2>/tmp/error ; then
|
|
ERROR=$(tail -n 1 /tmp/error)
|
|
whiptail_error_die "Error updating GPG ownertrust:\n\n$ERROR"
|
|
fi
|
|
# clear any existing heads/gpg files from current firmware
|
|
for i in `cbfs -o /tmp/oem-setup.rom -l | grep -e "heads/"`; do
|
|
cbfs -o /tmp/oem-setup.rom -d $i
|
|
done
|
|
# add heads/gpg files to current firmware
|
|
if [ -e /.gnupg/pubring.kbx ];then
|
|
cbfs -o /tmp/oem-setup.rom -a "heads/initrd/.gnupg/pubring.kbx" -f /.gnupg/pubring.kbx
|
|
if [ -e /.gnupg/pubring.gpg ];then
|
|
rm /.gnupg/pubring.gpg
|
|
fi
|
|
elif [ -e /.gnupg/pubring.gpg ];then
|
|
cbfs -o /tmp/oem-setup.rom -a "heads/initrd/.gnupg/pubring.gpg" -f /.gnupg/pubring.gpg
|
|
fi
|
|
if [ -e /.gnupg/trustdb.gpg ]; then
|
|
cbfs -o /tmp/oem-setup.rom -a "heads/initrd/.gnupg/trustdb.gpg" -f /.gnupg/trustdb.gpg
|
|
fi
|
|
# persist user config changes (boot device)
|
|
if [ -e /etc/config.user ]; then
|
|
cbfs -o /tmp/oem-setup.rom -a "heads/initrd/etc/config.user" -f /etc/config.user
|
|
fi
|
|
# flash updated firmware image
|
|
echo -e "\nAdding generated key to current firmware and re-flashing...\n"
|
|
if ! /bin/flash.sh /tmp/oem-setup.rom >/dev/null 2>/tmp/error ; then
|
|
ERROR=$(tail -n 1 /tmp/error)
|
|
whiptail_error_die "Error flashing updated firmware image:\n\n$ERROR"
|
|
fi
|
|
|
|
## sign files in /boot and generate checksums
|
|
echo -e "\nSigning boot files and generating checksums...\n"
|
|
generate_checksums
|
|
|
|
## all done -- reboot
|
|
whiptail --msgbox "
|
|
The OEM Factory Reset has completed successfully\n\n
|
|
After rebooting, you will need to generate new TOTP/HOTP secrets\n
|
|
when prompted in order to complete the setup process.\n\n
|
|
Press Enter to reboot.\n" \
|
|
$WIDTH $HEIGHT --title "OEM Factory Reset Complete"
|
|
|
|
reboot
|