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Add script to sign arbitrary files using the key stored in Secrets Ma…
…nager
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Rico Huijbers
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May 30, 2018
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#!/bin/bash | ||
set -euo pipefail | ||
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if [[ "${1:-}" == "" ]]; then | ||
echo "Usage: sign.sh FILE" >&2 | ||
exit 1 | ||
fi | ||
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tmpdir=$(mktemp -d) | ||
trap "shred $tmpdir/* && rm -rf $tmpdir" EXIT | ||
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SECRET=CDK/SigningKey | ||
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# Use secrets manager to obtain the key and passphrase into a JSON file | ||
echo "Retrieving key..." >&2 | ||
aws --region us-east-1 secretsmanager get-secret-value --secret-id "$SECRET" --output text --query SecretString > $tmpdir/secret.txt | ||
passphrase=$(python -c "import json; print(json.load(file('$tmpdir/secret.txt'))['Passphrase'])") | ||
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echo "Importing key..." >&2 | ||
gpg --homedir $tmpdir --import <(python -c "import json; print(json.load(file('$tmpdir/secret.txt'))['PrivateKey'])") | ||
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echo "Signing $1..." >&2 | ||
echo $passphrase | gpg \ | ||
--homedir $tmpdir \ | ||
--local-user aws-cdk@amazon.com \ | ||
--batch --yes \ | ||
--passphrase-fd 0 \ | ||
--output $1.sig \ | ||
--detach-sign $1 | ||
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echo "Done!" >&2 |