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File name : is-not-revoked

Content :

#!/bin/bash
set -e
# we need to set lastpipe so we can read the signers into the signers array below
shopt -s lastpipe

exit=0

quiet=""
if [ "$1" = "-q" ]; then
	quiet=true
	shift
fi

compress_type() {
	local file="$1"
	magic="$(od -x -N2 "$file" | head -1 | cut -d' ' -f2)"
	case $magic in
		8b1f)
			echo "gzip"
			;;
		*)
			echo "none"
			;;
	esac
}

for signed_binary in "$@"; do
	if [ ! -e "$signed_binary" ]; then
		echo "E: $signed_binary: file not found">&2
		exit=1
		continue
	fi

if [ "$(compress_type "$signed_binary")" = "gzip" ]; then
		_signed_binary="$(mktemp)"
		trap 'rm -f "$_signed_binary"' EXIT
		gunzip < "$signed_binary" > "$_signed_binary"
	else
		_signed_binary="$signed_binary"
	fi
	sbverify --list "$_signed_binary" | grep subject: | grep -E -o "CN=([^/]|\\/)*" | readarray -t signers
	if [ -z "$signers" ]; then
		echo "E: $signed_binary: Could not find signing subject, sbverify output follows:">&2
		sbverify --list "$_signed_binary" >&2
		exit=1
		continue
	fi

for signer in "${signers[@]}"; do
		revoked=$(grep -xF "$signer" << EOF
CN=Canonical Ltd. Secure Boot Signing
CN=Canonical Ltd. Secure Boot Signing (2017)
CN=Canonical Ltd. Secure Boot Signing (ESM 2018)
CN=Canonical Ltd. Secure Boot Signing (2019)
CN=Canonical Ltd. Secure Boot Signing (Ubuntu Core 2019)
CN=Canonical Ltd. Secure Boot Signing (2021 v1)
CN=Canonical Ltd. Secure Boot Signing (2021 v2)
CN=Canonical Ltd. Secure Boot Signing (2021 v3)
EOF
	) || true

if [ "$revoked" ]; then
			if [ -z "$quiet" ]; then
				echo "E: $signed_binary: revoked key $revoked used">&2
			fi
			exit=1
		fi
    done
done
exit $exit