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85 lines
2.1 KiB
Plaintext
85 lines
2.1 KiB
Plaintext
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#!/bin/sh
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# Retrieve the sealed TOTP secret and initialize a Librem Key with it
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. /etc/functions
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HOTP_SEALED="/tmp/secret/hotp.sealed"
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HOTP_SECRET="/tmp/secret/hotp.key"
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HOTP_COUNTER="/boot/kexec_hotp_counter"
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mount_boot()
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{
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# Mount local disk if it is not already mounted
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if ! grep -q /boot /proc/mounts ; then
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mount -o ro /boot \
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|| recovery "Unable to mount /boot"
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fi
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}
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tpm nv_readvalue \
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-in 4d47 \
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-sz 312 \
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-of "$HOTP_SEALED" \
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|| die "Unable to retrieve sealed file from TPM NV"
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tpm unsealfile \
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-hk 40000000 \
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-if "$HOTP_SEALED" \
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-of "$HOTP_SECRET" \
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|| die "Unable to unseal HOTP secret"
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rm -f "$HOTP_SEALED"
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secret="`cat $HOTP_SECRET`"
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rm -f "$HOTP_SECRET"
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# get current value of HOTP counter in TPM, create if absent
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mount_boot
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check_tpm_counter $HOTP_COUNTER hotp \
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|| die "Unable to find/create TPM counter"
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counter="$TPM_COUNTER"
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counter_value=$(read_tpm_counter $counter | cut -f2 -d ' ' | awk 'gsub("^000e","")')
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if [ "$counter_value" == "" ]; then
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die "Unable to read HOTP TPM counter"
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fi
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counter_value=$(printf "%d" 0x${counter_value})
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enable_usb
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if ! libremkey_hotp_verification info ; then
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echo "Insert your Librem Key and press Enter to configure it"
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read
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libremkey_hotp_verification info \
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|| die "Unable to find Librem Key"
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fi
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read -s -p "Enter your Librem Key Admin PIN" admin_pin
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echo
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libremkey_hotp_initialize $admin_pin $secret $counter_value
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if [ $? -ne 0 ]; then
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read -s -p "Error setting HOTP secret, re-enter Admin PIN and try again:" admin_pin
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libremkey_hotp_initialize $admin_pin $secret $counter_value \
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|| die "Setting HOTP secret failed"
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fi
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secret=""
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# Make sure our counter is incremented ahead of the next check
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increment_tpm_counter $counter > /dev/null \
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|| die "Unable to increment tpm counter"
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increment_tpm_counter $counter > /dev/null \
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|| die "Unable to increment tpm counter"
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mount -o remount,rw /boot
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sha256sum /tmp/counter-$counter > $HOTP_COUNTER \
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|| die "Unable to create hotp counter file"
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mount -o remount,ro /boot
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echo "Librem Key initialized successfully. Press Enter to continue."
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read
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exit 0
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