mirror of
https://github.com/linuxboot/heads.git
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9016ebccc2
oem-factory-reset: adapt code so that custom passphrases can be provided by user without changing oem factory reset workflow.
oem-factory-reset: output provisioned secrets on screen at the end of of the process.
oem-factory-reset: warn user of what security components will be provisioned with defaults/customs PINs prior of choosing not after
gui-init and oem-factory-reset: change OEM Factory Reset -> OEM Factory Reset / Re-Ownership to cover actual use cases
578 lines
18 KiB
Bash
Executable File
578 lines
18 KiB
Bash
Executable File
#!/bin/sh
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# Automated setup of TPM, GPG keys, and disk
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set -o pipefail
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# use TERM to exit on error
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trap "exit 1" TERM
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export TOP_PID=$$
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## Static local variables
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CLEAR="--clear"
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CONTINUE="--yes-button Continue"
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CANCEL="--no-button Cancel"
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HEIGHT="30"
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WIDTH="90"
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USER_PIN_DEF=123456
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ADMIN_PIN_DEF=12345678
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TPM_PASS_DEF=12345678
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USER_PIN=""
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ADMIN_PIN=""
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TPM_PASS=""
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# What are the Security components affected by custom passwords
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CUSTOM_PASS_AFFECTED_COMPONENTS=""
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if [ "$CONFIG_TPM" = "y" ]; then
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CUSTOM_PASS_AFFECTED_COMPONENTS="TPM Ownership password"
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fi
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CUSTOM_PASS_AFFECTED_COMPONENTS="
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$CUSTOM_PASS_AFFECTED_COMPONENTS
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GPG Admin PIN
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GPG User PIN"
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RSA_KEY_LENGTH=3072
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GPG_USER_NAME="OEM Key"
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GPG_KEY_NAME=`date +%Y%m%d%H%M%S`
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GPG_USER_MAIL="oem-${GPG_KEY_NAME}@example.com"
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GPG_USER_COMMENT="OEM-generated key"
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SKIP_BOOT="n"
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## External files sourced
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. /etc/functions
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. /tmp/config
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## functions
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die() {
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local msg=$1
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if [ -n "$msg" ]; then
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echo -e "\n$msg"
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fi
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kill -s TERM $TOP_PID
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exit 1
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}
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whiptail_error()
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{
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local msg=$1
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if [ "$msg" = "" ]; then
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die "whiptail error: An error msg is required"
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fi
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whiptail $BG_COLOR_ERROR --msgbox "${msg}\n\n" $HEIGHT $WIDTH $BG_COLOR_ERROR --title "Error"
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}
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whiptail_error_die()
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{
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whiptail_error "$@"
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die
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}
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gpg_key_reset()
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{
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# Factory reset GPG card
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{
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echo admin
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echo factory-reset
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echo y
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echo yes
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} | gpg --command-fd=0 --status-fd=1 --pinentry-mode=loopback --card-edit \
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> /tmp/gpg_card_edit_output 2>/dev/null
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if [ $? -ne 0 ]; then
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ERROR=`cat /tmp/gpg_card_edit_output`
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whiptail_error_die "GPG Key factory reset failed!\n\n$ERROR"
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fi
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# If Nitrokey Storage is inserted, reset AES keys as well
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if lsusb | grep -q "20a0:4109" && [ -x /bin/hotp_verification ] ; then
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/bin/hotp_verification regenerate ${ADMIN_PIN_DEF}
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fi
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# Set RSA key length
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{
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echo admin
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echo key-attr
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echo 1 # RSA
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echo ${RSA_KEY_LENGTH} #Signing key size set to RSA_KEY_LENGTH
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echo ${ADMIN_PIN_DEF}
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echo 1 # RSA
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echo ${RSA_KEY_LENGTH} #Encryption key size set to RSA_KEY_LENGTH
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echo ${ADMIN_PIN_DEF}
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echo 1 # RSA
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echo ${RSA_KEY_LENGTH} #Authentication key size set to RSA_KEY_LENGTH
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echo ${ADMIN_PIN_DEF}
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} | gpg --command-fd=0 --status-fd=1 --pinentry-mode=loopback --card-edit \
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> /tmp/gpg_card_edit_output 2>/dev/null
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if [ $? -ne 0 ]; then
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ERROR=`cat /tmp/gpg_card_edit_output`
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whiptail_error_die "Setting key attributed to RSA ${RSA_KEY_LENGTH} bits in USB security dongle failed."
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fi
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# Generate OEM GPG keys
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{
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echo admin
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echo generate
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echo n
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echo ${ADMIN_PIN_DEF}
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echo ${USER_PIN_DEF}
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echo 0
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echo y
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echo ${GPG_USER_NAME}
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echo ${GPG_USER_MAIL}
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echo ${GPG_USER_COMMENT}
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} | gpg --command-fd=0 --status-fd=2 --pinentry-mode=loopback --card-edit \
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> /tmp/gpg_card_edit_output 2>/dev/null
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if [ $? -ne 0 ]; then
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ERROR=`cat /tmp/gpg_card_edit_output`
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whiptail_error_die "GPG Key automatic keygen failed!\n\n$ERROR"
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fi
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}
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gpg_key_change_pin()
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{
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# 1 = user PIN, 3 = admin PIN
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PIN_TYPE=$1
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PIN_ORIG=$2
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PIN_NEW=$3
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# Change PIN
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{
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echo admin
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echo passwd
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echo ${PIN_TYPE}
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echo ${PIN_ORIG}
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echo ${PIN_NEW}
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echo ${PIN_NEW}
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echo q
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echo q
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} | gpg --command-fd=0 --status-fd=2 --pinentry-mode=loopback --card-edit \
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> /tmp/gpg_card_edit_output 2>/dev/null
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if [ $? -ne 0 ]; then
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ERROR=`cat /tmp/gpg_card_edit_output | fold -s`
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whiptail_error_die "GPG Key PIN change failed!\n\n$ERROR"
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fi
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}
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generate_checksums()
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{
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# ensure /boot mounted
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if ! grep -q /boot /proc/mounts ; then
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mount -o rw /boot || whiptail_error_die "Unable to mount /boot"
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else
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mount -o remount,rw /boot || whiptail_error_die "Unable to mount /boot"
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fi
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# clear any existing checksums/signatures
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rm /boot/kexec* 2>/dev/null
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# create Heads TPM counter
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if [ "$CONFIG_TPM" = "y" ]; then
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tpm counter_create \
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-pwdo "$TPM_PASS" \
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-pwdc '' \
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-la -3135106223 \
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| tee /tmp/counter \
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|| whiptail_error_die "Unable to create TPM counter"
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TPM_COUNTER=`cut -d: -f1 < /tmp/counter`
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# increment TPM counter
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increment_tpm_counter $TPM_COUNTER >/dev/null 2>&1 \
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|| whiptail_error_die "Unable to increment tpm counter"
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# create rollback file
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sha256sum /tmp/counter-$TPM_COUNTER > /boot/kexec_rollback.txt 2>/dev/null \
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|| whiptail_error_die "Unable to create rollback file"
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else
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## needs to exist for initial call to unseal-hotp
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echo "0" > /boot/kexec_hotp_counter
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fi
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# set default boot option
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set_default_boot_option
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# generate hashes
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find /boot -type f ! -name '*kexec*' -print0 \
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| xargs -0 sha256sum > /boot/kexec_hashes.txt 2>/dev/null \
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|| whiptail_error_die "Error generating kexec hashes"
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param_files=`find /boot/kexec*.txt`
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[ -z "$param_files" ] \
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&& whiptail_error_die "No kexec parameter files to sign"
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# sign kexec boot files
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if sha256sum $param_files 2>/dev/null | gpg \
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--pinentry-mode loopback \
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--passphrase "$USER_PIN" \
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--digest-algo SHA256 \
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--detach-sign \
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-a \
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> /boot/kexec.sig 2>/tmp/error; then
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# successful - update the validated params
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if ! check_config /boot >/dev/null 2>/tmp/error ; then
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cat /tmp/error
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ret=1
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else
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ret=0
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fi
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else
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cat /tmp/error
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ret=1
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fi
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# done writing to /boot, switch back to RO
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mount -o ro,remount /boot
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if [ $ret = 1 ] ; then
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ERROR=$(tail -n 1 /tmp/error | fold -s)
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whiptail_error_die "Error signing kexec boot files:\n\n$ERROR"
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fi
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}
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set_default_boot_option()
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{
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option_file="/tmp/kexec_options.txt"
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tmp_menu_file="/tmp/kexec/kexec_menu.txt"
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hash_file="/boot/kexec_default_hashes.txt"
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mkdir -p /tmp/kexec/
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rm $option_file 2>/dev/null
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# parse boot options from grub.cfg
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for i in `find /boot -name "grub.cfg"`; do
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kexec-parse-boot "/boot" "$i" >> $option_file
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done
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# FC29/30+ may use BLS format grub config files
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# https://fedoraproject.org/wiki/Changes/BootLoaderSpecByDefault
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# only parse these if $option_file is still empty
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if [ ! -s $option_file ] && [ -d "/boot/loader/entries" ]; then
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for i in `find /boot -name "grub.cfg"`; do
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kexec-parse-bls "/boot" "$i" "/boot/loader/entries" >> $option_file
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done
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fi
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[ ! -s $option_file ] \
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&& whiptail_error_die "Failed to parse any boot options"
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# sort boot options
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sort -r $option_file | uniq > $tmp_menu_file
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## save first option as default
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entry=`head -n 1 $tmp_menu_file | tail -1`
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# clear existing default configs
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rm "/boot/kexec_default.*.txt" 2>/dev/null
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# get correct index for entry
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index=$(grep -n "$entry" $option_file | cut -f1 -d ':')
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# write new config
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echo "$entry" > /boot/kexec_default.$index.txt
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# validate boot option
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( cd /boot && /bin/kexec-boot -b "/boot" -e "$entry" -f \
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| xargs sha256sum > $hash_file 2>/dev/null ) \
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|| whiptail_error_die "Failed to create hashes of boot files"
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}
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## main script start
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# check for args
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if [ "$1" != "" ]; then
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title_text=$1
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else
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title_text="OEM Factory Reset / Re-Ownership"
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fi
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if [ "$2" != "" ]; then
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bg_color=$2
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else
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bg_color=""
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fi
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# show warning prompt
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if [ "$CONFIG_TPM" = "y" ]; then
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TPM_STR=" * ERASE the TPM and own it with a password\n"
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else
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TPM_STR=""
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fi
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if ! whiptail --yesno "
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This operation will automatically:\n
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$TPM_STR
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* ERASE any keys or passwords on the GPG smart card,\n
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reset it to a factory state, generate new keys\n
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and optionally set custom PIN(s)
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* Add the new GPG key to the firmware and reflash it\n
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* Sign all of the files in /boot with the new GPG key\n\n
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It requires that you already have an OS installed on a\n
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dedicated /boot partition. Do you wish to continue?" \
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$HEIGHT $WIDTH $CONTINUE $CANCEL $CLEAR $bg_color --title "$title_text" ; then
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exit 1
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fi
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# Inform user of security components affected for the following prompts
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echo -e "The following security components will be provisioned with defaults or chosen PINs/passwords:
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$CUSTOM_PASS_AFFECTED_COMPONENTS\n"
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# Prompt to change default passwords
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echo -e -n "Would you like to set a single custom password that will be provisioned to all security components? [y/N]: "
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read -n 1 prompt_output
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echo
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if [ "$prompt_output" == "y" \
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-o "$prompt_output" == "Y" ] \
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; then
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echo -e "\nThe chosen custom password must be at least 8 characters in length.\n"
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echo
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while [[ ${#CUSTOM_SINGLE_PASS} -lt 8 ]] ; do
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echo -e -n "Enter the custom password: "
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read CUSTOM_SINGLE_PASS
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done
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echo
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TPM_PASS=$CUSTOM_SINGLE_PASS
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USER_PIN=$CUSTOM_SINGLE_PASS
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ADMIN_PIN=$CUSTOM_SINGLE_PASS
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else
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echo -e -n "Would you like to set distinct PINs/passwords to be provisioned to security components? [y/N]: "
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read -n 1 prompt_output
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echo
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if [ "$prompt_output" == "y" \
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-o "$prompt_output" == "Y" ] \
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; then
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echo -e "\nThey must be each at least 8 characters in length.\n"
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echo
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if [ "$CONFIG_TPM" = "y" ]; then
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while [[ ${#TPM_PASS} -lt 8 ]] ; do
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echo -e -n "Enter desired TPM Ownership password: "
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read TPM_PASS
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done
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fi
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while [[ ${#ADMIN_PIN} -lt 8 ]] ; do
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echo -e -n "Enter desired GPG Admin PIN: "
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read ADMIN_PIN
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done
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while [[ ${#USER_PIN} -lt 8 ]] ; do
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echo -e -n "Enter desired GPG User PIN: "
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read USER_PIN
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done
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echo
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fi
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fi
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# If nothing is stored in custom variables, we set them to their defaults
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if [ "$TPM_PASS" == "" ]; then TPM_PASS=$TPM_PASS_DEF; fi
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if [ "$USER_PIN" == "" ]; then USER_PIN=$USER_PIN_DEF; fi
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if [ "$ADMIN_PIN" == "" ]; then ADMIN_PIN=$ADMIN_PIN_DEF; fi
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# Prompt to change default GnuPG key information
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echo -e -n "Would you like to set custom user information for the GnuPG key? [y/N]: "
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read -n 1 prompt_output
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echo
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if [ "$prompt_output" == "y" \
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-o "$prompt_output" == "Y" ] \
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; then
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echo -e "\n\n"
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echo -e "We will generate a GnuPG (PGP) keypair identifiable with the following text form:"
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echo -e "Real Name (Comment) email@address.org"
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echo -e "\nEnter your Real Name (At least 5 characters long):"
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read -r GPG_USER_NAME
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while [[ ${#GPG_USER_NAME} -lt 5 ]]; do
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{
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echo -e "\nEnter your Real Name (At least 5 characters long):"
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read -r GPG_USER_NAME
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};done
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echo -e "\nEnter your email@adress.org:"
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read -r GPG_USER_MAIL
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while ! $(expr "$GPG_USER_MAIL" : '.*@' >/dev/null); do
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{
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echo -e "\nEnter your email@address.org:"
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read -r GPG_USER_MAIL
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};done
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echo -e "\nEnter Comment (Optional, to distinguish this key from others with same previous attributes. Must be smaller then 60 characters):"
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read -r GPG_USER_COMMENT
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while [[ ${#GPG_USER_COMMENT} -gt 60 ]]; do
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{
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echo -e "\nEnter Comment (Optional, to distinguish this key from others with same previous attributes. Must be smaller then 60 characters):"
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read -r GPG_USER_COMMENT
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};done
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fi
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## sanity check the USB, GPG key, and boot device before proceeding further
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# Prompt to insert USB drive if desired
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echo -e -n "Would you like to export your public key to an USB drive? [y/N]: "
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read -n 1 prompt_output
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echo
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if [ "$prompt_output" == "y" \
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-o "$prompt_output" == "Y" ] \
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; then
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GPG_EXPORT=1
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# mount USB over /media only if not already mounted
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if ! grep -q /media /proc/mounts ; then
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# mount USB in rw
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if ! mount-usb rw 2>/tmp/error; then
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ERROR=$(tail -n 1 /tmp/error | fold -s)
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whiptail_error_die "Unable to mount USB on /media:\n\n${ERROR}"
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fi
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else
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#/media already mounted, make sure it is in r+w mode
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if ! mount -o remount,rw /media 2>/tmp/error; then
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ERROR=$(tail -n 1 /tmp/error | fold -s)
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whiptail_error_die "Unable to remount in read+write USB on /media:\n\n${ERROR}"
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fi
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fi
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else
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GPG_EXPORT=0
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# needed for USB Security dongle below and is ensured via mount-usb in case of GPG_EXPORT=1
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enable_usb
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fi
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# ensure USB Security Dongle connected
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echo -e "\nChecking for USB Security Dongle...\n"
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# USB kernel modules already loaded via mount-usb
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if ! gpg --card-status >/dev/null 2>&1 ; then
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whiptail_error "Can't access USB Security Dongle; \nPlease remove and reinsert, then press Enter."
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if ! gpg --card-status >/dev/null 2>/tmp/error ; then
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ERROR=$(tail -n 1 /tmp/error | fold -s)
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whiptail_error_die "Unable to detect USB Security Dongle:\n\n${ERROR}"
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fi
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fi
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# detect and set /boot device
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echo -e "\nDetecting and setting boot device...\n"
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if ! detect_boot_device ; then
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SKIP_BOOT="y"
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else
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echo -e "Boot device set to $CONFIG_BOOT_DEV\n"
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fi
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# update configs
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if [[ "$SKIP_BOOT" == "n" ]]; then
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replace_config /etc/config.user "CONFIG_BOOT_DEV" "$CONFIG_BOOT_DEV"
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combine_configs
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fi
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## reset TPM and set password
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if [ "$CONFIG_TPM" = "y" ]; then
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echo -e "\nResetting TPM...\n"
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{
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echo $TPM_PASS
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echo $TPM_PASS
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} | /bin/tpm-reset >/dev/null 2>/tmp/error
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if [ $? -ne 0 ]; then
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ERROR=$(tail -n 1 /tmp/error | fold -s)
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whiptail_error_die "Error resetting TPM:\n\n${ERROR}"
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fi
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fi
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# clear local keyring
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rm /.gnupg/*.gpg 2>/dev/null
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rm /.gnupg/*.kbx 2>/dev/null
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gpg --list-keys >/dev/null 2>&1
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## reset the GPG Key
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echo -e "\nResetting GPG Key...\n(this will take around 3 minutes...)\n"
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gpg_key_reset
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# parse name of generated key
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GPG_GEN_KEY=`grep -A1 pub /tmp/gpg_card_edit_output | tail -n1 | sed -nr 's/^([ ])*//p'`
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PUBKEY="/tmp/${GPG_GEN_KEY}.asc"
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#Applying custom GPG PINs
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if [ "$USER_PIN" != "" -o "$ADMIN_PIN" != "" ]; then
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echo -e "\nChanging default GPG Admin PIN\n"
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gpg_key_change_pin "3" "$ADMIN_PIN_DEF" "$ADMIN_PIN"
|
|
echo -e "\nChanging default GPG User PIN\n"
|
|
gpg_key_change_pin "1" "$USER_PIN_DEF" "$USER_PIN"
|
|
fi
|
|
|
|
# export pubkey to file
|
|
if ! gpg --export --armor $GPG_GEN_KEY > "${PUBKEY}" 2>/tmp/error ; then
|
|
ERROR=$(tail -n 1 /tmp/error | fold -s)
|
|
whiptail_error_die "GPG Key gpg export to file failed!\n\n$ERROR"
|
|
fi
|
|
|
|
## export pubkey to USB
|
|
if [ $GPG_EXPORT -ne 0 ]; then
|
|
echo -e "\nExporting generated key to USB...\n"
|
|
# copy to USB
|
|
if ! cp "${PUBKEY}" "/media/${GPG_GEN_KEY}.asc" 2>/tmp/error ; then
|
|
ERROR=$(tail -n 1 /tmp/error | fold -s)
|
|
whiptail_error_die "Key export error: unable to copy ${GPG_GEN_KEY}.asc to /media:\n\n$ERROR"
|
|
fi
|
|
mount -o remount,ro /media 2>/dev/null
|
|
fi
|
|
|
|
## 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=$(tail -n 1 /tmp/error | fold -s)
|
|
whiptail_error_die "Error reading current firmware:\n\n$ERROR"
|
|
fi
|
|
|
|
# ensure key imported locally
|
|
if ! cat "$PUBKEY" | gpg --import >/dev/null 2>/tmp/error ; then
|
|
ERROR=$(tail -n 1 /tmp/error | fold -s)
|
|
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=$(tail -n 1 /tmp/error | fold -s)
|
|
whiptail_error_die "Error importing GPG ownertrust:\n\n$ERROR"
|
|
fi
|
|
if ! gpg --update-trust >/dev/null 2>/tmp/error ; then
|
|
ERROR=$(tail -n 1 /tmp/error | fold -s)
|
|
whiptail_error_die "Error updating GPG ownertrust:\n\n$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 | fold -s)
|
|
whiptail_error_die "Error flashing updated firmware image:\n\n$ERROR"
|
|
fi
|
|
|
|
## sign files in /boot and generate checksums
|
|
if [[ "$SKIP_BOOT" == "n" ]]; then
|
|
echo -e "\nSigning boot files and generating checksums...\n"
|
|
generate_checksums
|
|
fi
|
|
|
|
## Show user current provisioned PINS/Password prior of reboot
|
|
whiptail --msgbox "
|
|
TPM Owner Password: $TPM_PASS\n
|
|
GPG Admin PIN: $ADMIN_PIN\n
|
|
GPG User PIN: $USER_PIN\n\n" \
|
|
$HEIGHT $WIDTH --title "Provisioned secrets"
|
|
|
|
## all done -- reboot
|
|
whiptail --msgbox "
|
|
OEM Factory Reset / Re-Ownership 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" \
|
|
$HEIGHT $WIDTH --title "OEM Factory Reset / Re-Ownership Complete"
|
|
|
|
reboot
|