action-hsm-sign/entrypoint.sh

#!/bin/sh

dir="$(dirname "${INPUT_FILES}")"
glob="$(basename "${INPUT_FILES}")"
# Pass these through sort so we can have deterministic output indexing
if [ "${glob}" = "**" ]; then
  all_files="$(find "$dir" -type f |sort)"
else
  all_files="$(find "$dir" -maxdepth 1 -name "${glob}" |sort)"
fi
i=0
while IFS=  read -r f; do
  sign_dir="$(dirname "$f")"
  sign_file="$(basename "$f")"
  dest_sig="${sign_dir}/${sign_file}.sig"
  echo "Signing file $f. Signature file destination: ${dest_sig}"
  # We can't use a volume mount because it will use the host volume, and we're
  # not on the host, but in a container. So we'll create a container, copy
  # the file to sign in place, get the signature and copy that back
  container="$(docker create \
    -v /run/pcscd/pcscd.comm:/run/pcscd/pcscd.comm:ro \
    -e INPUT_PIN \
    git.lerch.org/lobo/pkcs11:1 \
    -s --id "${INPUT_SLOT}" -m SHA256-RSA-PKCS -i artifact -o signature --pin env:INPUT_PIN)"
  docker cp "$f" "${container}":/home/user/artifact
  docker start -a "$container" # let container run, pick up the exit code
  ec=$?
  if [ $ec -ne 0 ]; then
    docker rm "$container"
    exit $ec
  fi
  # We are clear. Copy signature back into the workspace and remove the container
  docker cp "${container}":/home/user/signature "${dest_sig}"
  docker rm "${container}"
  if [ -n "${INPUT_PUBLIC_KEY}" ]; then
    echo "Public key url specified. Uploading to sigstore public transparency log"
    echo "Fetching key from ${INPUT_PUBLIC_KEY}"
    curl -sLo /tmp/public_key "${INPUT_PUBLIC_KEY}"
    ec=$?; if [ $ec -ne 0 ]; then exit $ec; fi
    output=$(rekor upload --artifact "$f" --signature "${dest_sig}" --pki-format x509 --public-key /tmp/public_key)
    ec=$?; echo "$output"; if [ $ec -ne 0 ]; then exit $ec; fi
    # Index will not be there if the entry already exists
    # echo "INDEX_${i}=$(echo "$output"|cut -d, -f1|cut -d\  -f5)" >> "${GITHUB_OUTPUT}"
    # The parsing, though, is identical
    echo "URL_${i}=$(echo "$output"|cut -d: -f2-|cut -d\  -f2)" >> "${GITHUB_OUTPUT}"
    echo "SOURCE_${i}=${f}" >> "${GITHUB_OUTPUT}"
    echo "SIG_${i}=${dest_sig}" >> "${GITHUB_OUTPUT}"
    i=$((i+1))
  fi
done <<ALLFILES_INPUT
$all_files
ALLFILES_INPUT