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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.hosted.node.admin.maintenance.acl;
import com.google.common.net.InetAddresses;
import com.yahoo.config.provision.HostName;
import com.yahoo.vespa.hosted.dockerapi.Container;
import com.yahoo.vespa.hosted.node.admin.configserver.noderepository.Acl;
import com.yahoo.vespa.hosted.node.admin.configserver.noderepository.NodeRepository;
import com.yahoo.vespa.hosted.node.admin.docker.DockerOperations;
import com.yahoo.vespa.hosted.node.admin.task.util.network.IPAddresses;
import com.yahoo.vespa.hosted.node.admin.task.util.network.IPVersion;
import com.yahoo.vespa.hosted.node.admin.util.PrefixLogger;
import java.net.InetAddress;
import java.util.Map;
import java.util.stream.Collectors;
/**
* This class maintains the iptables (ipv4 and ipv6) for all running containers.
* The filter table is synced with ACLs fetched from the Node repository while the nat table
* is synched with the proper redirect rule.
* <p>
* If an ACL cannot be configured (e.g. iptables process execution fails) we attempted to flush the rules
* rendering the firewall open.
* <p>
* This class currently assumes control over the filter and nat table.
* <p>
* The configuration will be retried the next time the maintainer runs.
*
* @author mpolden
* @author smorgrav
*/
public class AclMaintainer {
private static final PrefixLogger log = PrefixLogger.getNodeAdminLogger(AclMaintainer.class);
private final DockerOperations dockerOperations;
private final NodeRepository nodeRepository;
private final IPAddresses ipAddresses;
private final String hostHostname;
public AclMaintainer(DockerOperations dockerOperations, NodeRepository nodeRepository,
HostName hostHostname, IPAddresses ipAddresses) {
this.dockerOperations = dockerOperations;
this.nodeRepository = nodeRepository;
this.ipAddresses = ipAddresses;
this.hostHostname = hostHostname.value();
}
private void applyRedirect(Container container, InetAddress address) {
IPVersion ipVersion = IPVersion.get(address);
// Necessary to avoid the routing packets destined for the node's own public IP address
// via the bridge, which is illegal.
String redirectRule = "-A OUTPUT -d " + InetAddresses.toAddrString(address) + ipVersion.singleHostCidr() + " -j REDIRECT";
IPTablesEditor.editLogOnError(dockerOperations, container.name, ipVersion, "nat", NatTableLineEditor.from(redirectRule));
}
private void apply(Container container, Acl acl) {
// Apply acl to the filter table
IPTablesEditor.editFlushOnError(dockerOperations, container.name, IPVersion.IPv6, "filter", FilterTableLineEditor.from(acl, IPVersion.IPv6));
IPTablesEditor.editFlushOnError(dockerOperations, container.name, IPVersion.IPv4, "filter", FilterTableLineEditor.from(acl, IPVersion.IPv4));
ipAddresses.getAddress(container.hostname, IPVersion.IPv4).ifPresent(addr -> applyRedirect(container, addr));
ipAddresses.getAddress(container.hostname, IPVersion.IPv6).ifPresent(addr -> applyRedirect(container, addr));
}
private synchronized void configureAcls() {
log.info("Configuring ACLs"); // Needed to potentially nail down when ACL maintainer stopped working
Map<String, Container> runningContainers = dockerOperations
.getAllManagedContainers().stream()
.filter(container -> container.state.isRunning())
.collect(Collectors.toMap(container -> container.hostname, container -> container));
nodeRepository.getAcls(hostHostname).entrySet().stream()
.filter(entry -> runningContainers.containsKey(entry.getKey()))
.forEach(entry -> apply(runningContainers.get(entry.getKey()), entry.getValue()));
}
public void converge() {
try {
configureAcls();
} catch (Throwable t) {
log.error("Failed to configure ACLs", t);
}
}
}
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