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// Copyright 2018 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.athenz.client.zts;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.yahoo.vespa.athenz.api.AthenzService;
import com.yahoo.vespa.athenz.api.NToken;
import com.yahoo.vespa.athenz.client.zts.bindings.InstanceIdentityCredentials;
import com.yahoo.vespa.athenz.client.zts.bindings.InstanceRefreshInformation;
import com.yahoo.vespa.athenz.client.zts.bindings.InstanceRegisterInformation;
import com.yahoo.vespa.athenz.identity.ServiceIdentityProvider;
import com.yahoo.vespa.athenz.tls.Pkcs10Csr;
import org.apache.http.HttpResponse;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpUriRequest;
import org.apache.http.client.methods.RequestBuilder;
import org.apache.http.entity.ContentType;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.DefaultHttpRequestRetryHandler;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.util.EntityUtils;
import org.eclipse.jetty.http.HttpStatus;
import javax.net.ssl.SSLContext;
import java.io.IOException;
import java.io.UncheckedIOException;
import java.net.URI;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReadWriteLock;
import java.util.concurrent.locks.ReentrantReadWriteLock;
import java.util.function.Function;
/**
* Default implementation of {@link ZtsClient}
*
* @author bjorncs
* @author mortent
*/
public class DefaultZtsClient implements ZtsClient {
private static final ObjectMapper objectMapper = new ObjectMapper();
private final URI ztsUrl;
private final ReadWriteLock lock = new ReentrantReadWriteLock();
private final ServiceIdentityProvider identityProvider;
private final ServiceIdentityProviderListener identityListener;
private volatile CloseableHttpClient client;
public DefaultZtsClient(URI ztsUrl, SSLContext sslContext) {
this.ztsUrl = ztsUrl;
this.client = createHttpClient(sslContext);
this.identityProvider = null;
this.identityListener = null;
}
public DefaultZtsClient(URI ztsUrl, ServiceIdentityProvider identityProvider) {
this.ztsUrl = ztsUrl;
this.client = createHttpClient(identityProvider.getIdentitySslContext());
this.identityProvider = identityProvider;
this.identityListener = new ServiceIdentityProviderListener();
identityProvider.addIdentityListener(this.identityListener);
}
@Override
public InstanceIdentity registerInstance(AthenzService providerIdentity,
AthenzService instanceIdentity,
String instanceId,
String attestationData,
boolean requestServiceToken,
Pkcs10Csr csr) {
InstanceRegisterInformation payload =
new InstanceRegisterInformation(providerIdentity, instanceIdentity, attestationData, csr, requestServiceToken);
HttpUriRequest request = RequestBuilder.post()
.setUri(ztsUrl.resolve("instance/"))
.setEntity(toJsonStringEntity(payload))
.build();
return withClient(client -> {
try (CloseableHttpResponse response = client.execute(request)) {
return getInstanceIdentity(response);
} catch (IOException e) {
throw new UncheckedIOException(e);
}
});
}
@Override
public InstanceIdentity refreshInstance(AthenzService providerIdentity,
AthenzService instanceIdentity,
String instanceId,
boolean requestServiceToken,
Pkcs10Csr csr) {
InstanceRefreshInformation payload = new InstanceRefreshInformation(csr, requestServiceToken);
URI uri = ztsUrl.resolve(
String.format("instance/%s/%s/%s/%s",
providerIdentity.getFullName(),
instanceIdentity.getDomain().getName(),
instanceIdentity.getName(),
instanceId));
HttpUriRequest request = RequestBuilder.post()
.setUri(uri)
.setEntity(toJsonStringEntity(payload))
.build();
return withClient(client -> {
try (CloseableHttpResponse response = client.execute(request)) {
return getInstanceIdentity(response);
} catch (IOException e) {
throw new UncheckedIOException(e);
}
});
}
private static InstanceIdentity getInstanceIdentity(HttpResponse response) throws IOException {
if (HttpStatus.isSuccess(response.getStatusLine().getStatusCode())) {
InstanceIdentityCredentials entity =
objectMapper.readValue(response.getEntity().getContent(), InstanceIdentityCredentials.class);
return entity.getServiceToken() != null
? new InstanceIdentity(entity.getX509Certificate(), new NToken(entity.getServiceToken()))
: new InstanceIdentity(entity.getX509Certificate());
} else {
String message = EntityUtils.toString(response.getEntity());
throw new ZtsClientException(
String.format("Unable to get identity. http code/message: %d/%s",
response.getStatusLine().getStatusCode(), message));
}
}
private static StringEntity toJsonStringEntity(Object entity) {
try {
return new StringEntity(objectMapper.writeValueAsString(entity), ContentType.APPLICATION_JSON);
} catch (JsonProcessingException e) {
throw new UncheckedIOException(e);
}
}
private <T> T withClient(Function<CloseableHttpClient, T> consumer) {
Lock lock = this.lock.readLock();
try {
return consumer.apply(this.client);
} finally {
lock.unlock();
}
}
private void setClient(CloseableHttpClient newClient) {
Lock lock = this.lock.writeLock();
CloseableHttpClient oldClient;
try {
oldClient = this.client;
this.client = newClient;
} finally {
lock.unlock();
}
if (oldClient != null) {
try {
oldClient.close();
} catch (IOException e) {
throw new UncheckedIOException(e);
}
}
}
private static CloseableHttpClient createHttpClient(SSLContext sslContext) {
return HttpClientBuilder.create()
.setRetryHandler(new DefaultHttpRequestRetryHandler(3, /*requestSentRetryEnabled*/true))
.setSslcontext(sslContext)
.build();
}
@Override
public void close() {
if (identityProvider != null && identityListener != null) {
identityProvider.removeIdentityListener(identityListener);
}
setClient(null);
}
private class ServiceIdentityProviderListener implements ServiceIdentityProvider.Listener {
@Override
public void onCredentialsUpdate(SSLContext sslContext, AthenzService identity) {
setClient(createHttpClient(sslContext));
}
}
}
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