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https://github.com/linuxboot/heads.git
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122 lines
3.3 KiB
Bash
Executable File
122 lines
3.3 KiB
Bash
Executable File
#!/bin/sh
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# Retrieve the sealed TOTP secret and initialize a USB Security dongle 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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HOTP_KEY="/boot/kexec_hotp_key"
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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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# Use stored HOTP key branding (this might be useful after OEM reset)
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if [ -r /boot/kexec_hotp_key ]; then
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HOTPKEY_BRANDING="$(cat /boot/kexec_hotp_key)"
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else
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HOTPKEY_BRANDING="HOTP USB Security Dongle"
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fi
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tpm nv_readvalue \
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-in 4d47 \
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-sz 312 \
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-of "$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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shred -n 10 -z -u "$HOTP_SEALED" 2> /dev/null
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# Store counter in file instead of TPM for now, as it conflicts with Heads
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# config TPM counter as TPM 1.2 can only increment one counter between reboots
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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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#
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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 counter"
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#fi
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#counter_value=$(printf "%d" 0x${counter_value})
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counter_value=1
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enable_usb
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if ! hotp_verification info ; then
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echo "Insert your $HOTPKEY_BRANDING and press Enter to configure it"
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read
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if ! hotp_verification info ; then
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# don't leak key on failure
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shred -n 10 -z -u "$HOTP_SECRET" 2> /dev/null
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die "Unable to find $HOTPKEY_BRANDING"
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fi
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fi
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# Set HOTP USB Security Dongle branding based on VID
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if [ ! $(lsusb | grep -q "20a0:") ]; then
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HOTPKEY_BRANDING="Nitrokey"
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elif [ ! $(lsusb | grep -q "316d:") ]; then
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HOTPKEY_BRANDING="Librem Key"
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else
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HOTPKEY_BRANDING="HOTP USB Security Dongle"
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fi
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echo -e ""
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read -s -p "Enter your $HOTPKEY_BRANDING Admin PIN: " admin_pin
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echo -e "\n"
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hotp_initialize "$admin_pin" $HOTP_SECRET $counter_value "$HOTPKEY_BRANDING"
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if [ $? -ne 0 ]; then
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echo -e "\n"
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read -s -p "Error setting HOTP secret, re-enter Admin PIN and try again: " admin_pin
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echo -e "\n"
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if ! hotp_initialize "$admin_pin" $HOTP_SECRET $counter_value "$HOTPKEY_BRANDING" ; then
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# don't leak key on failure
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shred -n 10 -z -u "$HOTP_SECRET" 2> /dev/null
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die "Setting HOTP secret failed"
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fi
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fi
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# HOTP key no longer needed
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shred -n 10 -z -u "$HOTP_SECRET" 2> /dev/null
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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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counter_value=`expr $counter_value + 1`
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echo $counter_value > $HOTP_COUNTER \
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|| die "Unable to create hotp counter file"
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# Store/overwrite HOTP USB Security Dongle branding found out beforehand
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echo $HOTPKEY_BRANDING > $HOTP_KEY \
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|| die "Unable to store hotp key file"
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#sha256sum /tmp/counter-$counter > $HOTP_COUNTER \
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#|| die "Unable to create hotp counter file"
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mount -o remount,ro /boot
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echo -e "\n$HOTPKEY_BRANDING initialized successfully. Press Enter to continue."
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read
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exit 0
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