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Elasticsearch Expanded Pack Plugin - Security
/*
* Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
* or more contributor license agreements. Licensed under the Elastic License
* 2.0; you may not use this file except in compliance with the Elastic License
* 2.0.
*/
package org.elasticsearch.xpack.security.enrollment;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.elasticsearch.action.ActionListener;
import org.elasticsearch.action.admin.cluster.node.info.NodeInfo;
import org.elasticsearch.action.admin.cluster.node.info.NodesInfoMetrics;
import org.elasticsearch.action.admin.cluster.node.info.NodesInfoRequest;
import org.elasticsearch.action.admin.cluster.node.info.TransportNodesInfoAction;
import org.elasticsearch.action.support.WriteRequest;
import org.elasticsearch.client.internal.Client;
import org.elasticsearch.client.internal.OriginSettingClient;
import org.elasticsearch.common.UUIDs;
import org.elasticsearch.common.transport.BoundTransportAddress;
import org.elasticsearch.common.transport.TransportAddress;
import org.elasticsearch.core.TimeValue;
import org.elasticsearch.env.Environment;
import org.elasticsearch.http.HttpInfo;
import org.elasticsearch.transport.TransportInfo;
import org.elasticsearch.xpack.core.security.EnrollmentToken;
import org.elasticsearch.xpack.core.security.action.apikey.CreateApiKeyAction;
import org.elasticsearch.xpack.core.security.action.apikey.CreateApiKeyRequest;
import org.elasticsearch.xpack.core.security.action.enrollment.KibanaEnrollmentAction;
import org.elasticsearch.xpack.core.security.action.enrollment.NodeEnrollmentAction;
import org.elasticsearch.xpack.core.security.authz.RoleDescriptor;
import org.elasticsearch.xpack.core.ssl.SSLService;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;
import java.util.function.Consumer;
import static org.elasticsearch.xpack.core.ClientHelper.SECURITY_ORIGIN;
import static org.elasticsearch.xpack.core.XPackSettings.ENROLLMENT_ENABLED;
public class InternalEnrollmentTokenGenerator extends BaseEnrollmentTokenGenerator {
private static final Logger LOGGER = LogManager.getLogger(InternalEnrollmentTokenGenerator.class);
private final Environment environment;
private final SSLService sslService;
private final Client client;
public InternalEnrollmentTokenGenerator(Environment environment, SSLService sslService, Client client) {
this.environment = environment;
this.sslService = sslService;
// enrollment tokens API keys will be owned by the "_xpack_security" system user ("_xpack_security" role)
this.client = new OriginSettingClient(client, SECURITY_ORIGIN);
}
/**
* Tries to create an enrollment token for Elasticsearch nodes enrolling to the current node.
* If node is bound only on localhost for either the transport or the HTTPS interface, no token is generated,
* in which case an empty string token is returned.
* In case of errors, including due to issues with the node's configuration, a {@code null} token is returned, and the exception
* is logged but no exception is thrown.
*/
public void maybeCreateNodeEnrollmentToken(Consumer consumer, Iterator backoff) {
// the enrollment token can only be used against the node that generated it
final NodesInfoRequest nodesInfoRequest = new NodesInfoRequest("_local").addMetrics(
NodesInfoMetrics.Metric.HTTP.metricName(),
NodesInfoMetrics.Metric.TRANSPORT.metricName()
);
client.execute(TransportNodesInfoAction.TYPE, nodesInfoRequest, ActionListener.wrap(response -> {
assert response.getNodes().size() == 1;
NodeInfo nodeInfo = response.getNodes().get(0);
TransportInfo transportInfo = nodeInfo.getInfo(TransportInfo.class);
HttpInfo httpInfo = nodeInfo.getInfo(HttpInfo.class);
if (null == transportInfo || null == httpInfo) {
if (backoff.hasNext()) {
LOGGER.debug("Local node's HTTP/transport info is not yet available, will retry...");
client.threadPool()
.schedule(() -> maybeCreateNodeEnrollmentToken(consumer, backoff), backoff.next(), client.threadPool().generic());
} else {
LOGGER.warn("Unable to get local node's HTTP/transport info after all retries.");
consumer.accept(null);
}
} else {
boolean noNonLocalTransportAddresses = splitAddresses(getAllTransportAddresses(transportInfo)).v2().isEmpty();
if (noNonLocalTransportAddresses) {
LOGGER.info(
"Will not generate node enrollment token because node is only bound on localhost for transport "
+ "and cannot connect to nodes from other hosts"
);
// empty enrollment token when skip
consumer.accept("");
return;
}
boolean noNonLocalHttpAddresses = splitAddresses(getAllHttpAddresses(httpInfo)).v2().isEmpty();
if (noNonLocalHttpAddresses) {
LOGGER.info(
"Will not generate node enrollment token because node is only bound on localhost for HTTPS "
+ "and cannot enroll nodes from other hosts"
);
// empty enrollment token when skip
consumer.accept("");
return;
}
LOGGER.debug("Attempting to generate the node enrollment token");
assembleToken(EnrollmentTokenType.NODE, httpInfo, token -> {
if (null == token) {
consumer.accept(null);
} else {
try {
LOGGER.debug("Successfully generated the node enrollment token");
consumer.accept(token.getEncoded());
} catch (Exception e) {
LOGGER.error("Failed to encode node enrollment token", e);
// null enrollment token when error
consumer.accept(null);
}
}
});
}
}, e -> {
LOGGER.error("Failed to create node enrollment token when retrieving local node's HTTP/transport info", e);
// null enrollment token when error
consumer.accept(null);
}));
}
/**
* Creates an enrollment token for Kibana instances enrolling to the current node.
* In case of errors, including due to issues with the node's configuration, a {@code null} token is returned, and the exception
* is logged but no exception is thrown.
*/
public void createKibanaEnrollmentToken(Consumer consumer, Iterator backoff) {
// the enrollment token can only be used against the node that generated it
final NodesInfoRequest nodesInfoRequest = new NodesInfoRequest("_local").addMetric(NodesInfoMetrics.Metric.HTTP.metricName());
client.execute(TransportNodesInfoAction.TYPE, nodesInfoRequest, ActionListener.wrap(response -> {
assert response.getNodes().size() == 1;
NodeInfo nodeInfo = response.getNodes().get(0);
HttpInfo httpInfo = nodeInfo.getInfo(HttpInfo.class);
if (null == httpInfo) {
if (backoff.hasNext()) {
LOGGER.info("Local node's HTTP info is not yet available, will retry...");
client.threadPool()
.schedule(() -> createKibanaEnrollmentToken(consumer, backoff), backoff.next(), client.threadPool().generic());
} else {
LOGGER.warn("Unable to get local node's HTTP info after all retries.");
consumer.accept(null);
}
} else {
assembleToken(EnrollmentTokenType.KIBANA, httpInfo, consumer);
}
}, e -> {
LOGGER.error("Failed to create kibana enrollment token when retrieving local nodes HTTP info", e);
consumer.accept(null);
}));
}
private void assembleToken(EnrollmentTokenType enrollTokenType, HttpInfo httpInfo, Consumer consumer) {
if (false == ENROLLMENT_ENABLED.get(environment.settings())) {
LOGGER.error(
"Cannot create enrollment token ["
+ enrollTokenType
+ "] because enrollment is disabled "
+ "with setting ["
+ ENROLLMENT_ENABLED.getKey()
+ "] set to [false]"
);
consumer.accept(null);
return;
}
final String fingerprint;
try {
fingerprint = getHttpsCaFingerprint();
} catch (Exception e) {
LOGGER.error(
"Failed to create enrollment token when computing HTTPS CA fingerprint, possibly the certs are not auto-generated",
e
);
consumer.accept(null);
return;
}
final List tokenAddresses;
try {
final List httpAddressesList = getAllHttpAddresses(httpInfo);
tokenAddresses = getFilteredAddresses(httpAddressesList);
} catch (Exception e) {
LOGGER.error("Failed to create enrollment when extracting HTTPS bound addresses", e);
consumer.accept(null);
return;
}
final CreateApiKeyRequest apiKeyRequest = new CreateApiKeyRequest(
"enrollment_token_API_key_" + UUIDs.base64UUID(),
List.of(new RoleDescriptor("create_enrollment_token", new String[] { enrollTokenType.toString() }, null, null)),
TimeValue.timeValueMinutes(ENROLL_API_KEY_EXPIRATION_MINUTES)
);
apiKeyRequest.setRefreshPolicy(WriteRequest.RefreshPolicy.IMMEDIATE);
client.execute(CreateApiKeyAction.INSTANCE, apiKeyRequest, ActionListener.wrap(createApiKeyResponse -> {
final String apiKey = createApiKeyResponse.getId() + ":" + createApiKeyResponse.getKey().toString();
final EnrollmentToken enrollmentToken = new EnrollmentToken(apiKey, fingerprint, tokenAddresses);
consumer.accept(enrollmentToken);
}, e -> {
LOGGER.error("Failed to create enrollment token when generating API key", e);
consumer.accept(null);
}));
}
public String getHttpsCaFingerprint() throws Exception {
return getHttpsCaFingerprint(sslService);
}
private static List getAllHttpAddresses(HttpInfo httpInfo) {
final List httpAddressesList = new ArrayList<>();
collectAllAddresses(httpInfo.getAddress(), httpAddressesList);
return httpAddressesList;
}
private static List getAllTransportAddresses(TransportInfo transportInfo) {
final List transportAddressesList = new ArrayList<>();
collectAllAddresses(transportInfo.getAddress(), transportAddressesList);
transportInfo.getProfileAddresses().values().forEach(profileAddress -> collectAllAddresses(profileAddress, transportAddressesList));
return transportAddressesList;
}
private static void collectAllAddresses(BoundTransportAddress address, List collectedAddressesList) {
collectedAddressesList.add(address.publishAddress().toString());
Arrays.stream(address.boundAddresses()).map(TransportAddress::toString).forEach(collectedAddressesList::add);
}
private enum EnrollmentTokenType {
KIBANA {
@Override
public String toString() {
return KibanaEnrollmentAction.NAME;
}
},
NODE {
@Override
public String toString() {
return NodeEnrollmentAction.NAME;
}
}
}
}
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