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50 lines
1.0 KiB
Bash
Executable File
50 lines
1.0 KiB
Bash
Executable File
#!/bin/sh
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# This will unseal and unecncrypt the drive encryption key from the TPM
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# The TOTP secret will be shown to the user on each encryption attempt.
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# It will then need to be bundled into initrd that is booted with Qubes.
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set -e -o pipefail
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TPM_INDEX=3
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TPM_SIZE=312
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. /etc/functions
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mkdir -p /tmp/secret
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sealed_file="/tmp/secret/sealed.key"
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key_file="$1"
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if [ -z "$key_file" ]; then
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key_file="/tmp/secret/secret.key"
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fi
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tpm nv_readvalue \
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-in "$TPM_INDEX" \
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-sz "$TPM_SIZE" \
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-of "$sealed_file" \
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|| die "Unable to read key from TPM NVRAM"
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for tries in 1 2 3; do
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read -s -p "Enter unlock password (blank to abort): " tpm_password
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echo
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if [ -z "$tpm_password" ]; then
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die "Aborting unseal disk encryption key"
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fi
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if tpm unsealfile \
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-if "$sealed_file" \
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-of "$key_file" \
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-pwdd "$tpm_password" \
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-hk 40000000 \
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; then
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# should be okay if this fails
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shred -n 10 -z -u /tmp/secret/sealed 2> /dev/null || true
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exit 0
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fi
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pcrs
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warn "Unable to unseal disk encryption key"
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done
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die "Retry count exceeded..."
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