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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.athenz.identityprovider.client;
import com.yahoo.security.SignatureUtils;
import com.yahoo.vespa.athenz.api.AthenzService;
import com.yahoo.vespa.athenz.identityprovider.api.ClusterType;
import com.yahoo.vespa.athenz.identityprovider.api.IdentityType;
import com.yahoo.vespa.athenz.identityprovider.api.SignedIdentityDocument;
import com.yahoo.vespa.athenz.identityprovider.api.VespaUniqueInstanceId;
import java.nio.ByteBuffer;
import java.security.GeneralSecurityException;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.Signature;
import java.security.SignatureException;
import java.time.Instant;
import java.util.Base64;
import java.util.Set;
import java.util.TreeSet;
import static java.nio.charset.StandardCharsets.UTF_8;
/**
* Generates and validates the signature for a {@link SignedIdentityDocument}
*
* @author bjorncs
*/
public class IdentityDocumentSigner {
public String generateSignature(VespaUniqueInstanceId providerUniqueId,
AthenzService providerService,
String configServerHostname,
String instanceHostname,
Instant createdAt,
Set<String> ipAddresses,
IdentityType identityType,
ClusterType clusterType,
PrivateKey privateKey) {
try {
Signature signer = SignatureUtils.createSigner(privateKey);
signer.initSign(privateKey);
writeToSigner(
signer, providerUniqueId, providerService, configServerHostname, instanceHostname, createdAt,
ipAddresses, identityType, clusterType);
byte[] signature = signer.sign();
return Base64.getEncoder().encodeToString(signature);
} catch (GeneralSecurityException e) {
throw new RuntimeException(e);
}
}
public boolean hasValidSignature(SignedIdentityDocument doc, PublicKey publicKey) {
try {
Signature signer = SignatureUtils.createVerifier(publicKey);
signer.initVerify(publicKey);
writeToSigner(
signer, doc.providerUniqueId(), doc.providerService(), doc.configServerHostname(),
doc.instanceHostname(), doc.createdAt(), doc.ipAddresses(), doc.identityType(), doc.clusterType());
return signer.verify(Base64.getDecoder().decode(doc.signature()));
} catch (GeneralSecurityException e) {
throw new RuntimeException(e);
}
}
private static void writeToSigner(Signature signer,
VespaUniqueInstanceId providerUniqueId,
AthenzService providerService,
String configServerHostname,
String instanceHostname,
Instant createdAt,
Set<String> ipAddresses,
IdentityType identityType,
ClusterType clusterType) throws SignatureException {
signer.update(providerUniqueId.asDottedString().getBytes(UTF_8));
signer.update(providerService.getFullName().getBytes(UTF_8));
signer.update(configServerHostname.getBytes(UTF_8));
signer.update(instanceHostname.getBytes(UTF_8));
ByteBuffer timestampAsBuffer = ByteBuffer.allocate(Long.BYTES);
timestampAsBuffer.putLong(createdAt.toEpochMilli());
signer.update(timestampAsBuffer.array());
for (String ipAddress : new TreeSet<>(ipAddresses)) {
signer.update(ipAddress.getBytes(UTF_8));
}
signer.update(identityType.id().getBytes(UTF_8));
if (clusterType != null) signer.update(clusterType.toConfigValue().getBytes(UTF_8));
}
}
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