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DscListDecoder.java
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DscListDecoder.java
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package app.coronawarn.server.services.distribution.dgc.dsc.decode;
import static app.coronawarn.server.common.shared.util.SecurityUtils.base64decode;
import static app.coronawarn.server.common.shared.util.SecurityUtils.ecdsaSignatureVerification;
import static app.coronawarn.server.common.shared.util.SecurityUtils.getEcdsaEncodeFromSignature;
import static app.coronawarn.server.common.shared.util.SecurityUtils.getPublicKeyFromString;
import static app.coronawarn.server.services.distribution.dgc.client.ProdDigitalCovidCertificateClient.AUDIT;
import app.coronawarn.server.common.shared.util.SerializationUtils;
import app.coronawarn.server.services.distribution.config.DistributionServiceConfig;
import app.coronawarn.server.services.distribution.dgc.CertificateStructure;
import app.coronawarn.server.services.distribution.dgc.Certificates;
import app.coronawarn.server.services.distribution.dgc.exception.DscListDecodeException;
import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.nio.charset.StandardCharsets;
import java.security.PublicKey;
import java.security.SignatureException;
import java.security.cert.CertificateException;
import java.security.cert.CertificateFactory;
import java.util.ArrayList;
import java.util.Collection;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.context.annotation.Profile;
import org.springframework.stereotype.Component;
@Component
@Profile("!revocation")
public class DscListDecoder {
private static final Logger logger = LoggerFactory.getLogger(DscListDecoder.class);
public static final char CONTENT_STARTS_CHAR = '{';
private final DistributionServiceConfig distributionServiceConfig;
public DscListDecoder(DistributionServiceConfig distributionServiceConfig) {
this.distributionServiceConfig = distributionServiceConfig;
}
/**
* Decode the trust list of certificates. Verifies the trust list content by using the ECDSA signature logic. Filters
* only X509 valid format certificates from the response.
*
* @param data - trust list response from DSC as string.
* @return - object wrapping the list of certificates.
* @throws DscListDecodeException - thrown if any exception is caught and special treatment if signature verification
* fails.
*/
public Certificates decode(String data) throws DscListDecodeException {
try {
PublicKey publicKey = getPublicKeyFromString(
distributionServiceConfig.getDigitalGreenCertificate().getDscClient().getPublicKey());
String signature = data.substring(0, data.indexOf(CONTENT_STARTS_CHAR)).trim();
String content = data.substring(signature.length()).trim();
byte[] ecdsaSignature = getEcdsaEncodeFromSignature(base64decode(signature));
ecdsaSignatureVerification(ecdsaSignature, publicKey, content.getBytes(StandardCharsets.UTF_8));
logger.info(AUDIT, "DSC list - {}", content);
Certificates certificates = SerializationUtils.deserializeJson(content,
typeFactory -> typeFactory.constructType(Certificates.class));
return filterValidCertificates(certificates);
} catch (SignatureException e) {
throw new DscListDecodeException("Signature verification failed! DSC list NOT decoded.", e);
} catch (Exception e) {
throw new DscListDecodeException("DSC list NOT decoded.", e);
}
}
/**
* Filters out from the Certificates object wrapper, the invalid X509 format certificates.
*/
private Certificates filterValidCertificates(Certificates certificates) {
final Collection<CertificateStructure> validCertificates = new ArrayList<>(certificates.getCertificates().size());
for (CertificateStructure certificate : certificates.getCertificates()) {
InputStream certificateStream = new ByteArrayInputStream(base64decode(certificate.getRawData()));
try {
CertificateFactory.getInstance("X.509").generateCertificate(certificateStream);
validCertificates.add(certificate);
} catch (CertificateException e) {
logger.error("Skipping certificate (kid=" + certificate.getKid() + ") due to X.509 validation failure.", e);
}
}
certificates.setCertificates(validCertificates);
return certificates;
}
}