mirror of
https://github.com/linuxboot/heads.git
synced 2025-02-22 01:46:42 +00:00
75cb8a070f
flash.sh had a special mode to read (like -r) and then sha256sum the resulting file. This is no different from just a read followed by a sha256sum, and the only caller also had logic to sha256sum a cached file anyway. Just use flash.sh -r and sha256sum the result. Signed-off-by: Jonathon Hall <jonathon.hall@puri.sm>
69 lines
1.8 KiB
Bash
Executable File
69 lines
1.8 KiB
Bash
Executable File
#!/bin/bash
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# Retrieve the sealed file and counter from the NVRAM, unseal it and compute the hotp
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. /etc/functions
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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_or_die()
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{
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TRACE "Under /bin/unseal-hotp:mount_boot_or_die"
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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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|| die "Unable to mount /boot"
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fi
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}
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TRACE "Under /bin/unseal-hotp"
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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_or_die
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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 $counter | cut -f2 -d ' ' | awk 'gsub("^000e","")')
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#
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counter_value=$(cat $HOTP_COUNTER)
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if [ "$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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if [ "$CONFIG_TPM" = "y" ]; then
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DEBUG "Unsealing HOTP secret reuses TOTP sealed secret..."
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tpmr unseal 4d47 0,1,2,3,4,7 312 "$HOTP_SECRET"
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else
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# without a TPM, use the first 20 characters of the ROM SHA256sum
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secret_from_rom_hash > "$HOTP_SECRET" || die "Reading ROM failed"
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fi
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if ! hotp $counter_value < "$HOTP_SECRET"; then
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shred -n 10 -z -u "$HOTP_SECRET" 2> /dev/null
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die 'Unable to compute HOTP hash?'
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fi
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shred -n 10 -z -u "$HOTP_SECRET" 2> /dev/null
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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 > $HOTP_COUNTER \
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|| die "Unable to create hotp counter file"
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#sha256sum /tmp/counter-$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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exit 0
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