netconf/callhome-provider/src/main/java/org/opendaylight/netconf/callhome/mount/CallhomeStatusReporter.java

   1 /*
   2  * Copyright (c) 2016 Brocade Communication Systems and others.  All rights reserved.
   3  *
   4  * This program and the accompanying materials are made available under the
   5  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
   6  * and is available at http://www.eclipse.org/legal/epl-v10.html
   7  */
   8 package org.opendaylight.netconf.callhome.mount;
   9
  10 import com.google.common.util.concurrent.FutureCallback;
  11 import com.google.common.util.concurrent.MoreExecutors;
  12 import java.io.IOException;
  13 import java.security.GeneralSecurityException;
  14 import java.security.PublicKey;
  15 import java.util.Collection;
  16 import java.util.Collections;
  17 import java.util.Optional;
  18 import java.util.concurrent.ExecutionException;
  19 import org.opendaylight.mdsal.binding.api.DataBroker;
  20 import org.opendaylight.mdsal.binding.api.DataObjectModification;
  21 import org.opendaylight.mdsal.binding.api.DataTreeChangeListener;
  22 import org.opendaylight.mdsal.binding.api.DataTreeIdentifier;
  23 import org.opendaylight.mdsal.binding.api.DataTreeModification;
  24 import org.opendaylight.mdsal.binding.api.ReadTransaction;
  25 import org.opendaylight.mdsal.binding.api.WriteTransaction;
  26 import org.opendaylight.mdsal.common.api.CommitInfo;
  27 import org.opendaylight.mdsal.common.api.LogicalDatastoreType;
  28 import org.opendaylight.netconf.callhome.protocol.AuthorizedKeysDecoder;
  29 import org.opendaylight.netconf.callhome.protocol.StatusRecorder;
  30 import org.opendaylight.yang.gen.v1.urn.opendaylight.callhome.device.status.rev170112.Device1;
  31 import org.opendaylight.yang.gen.v1.urn.opendaylight.callhome.device.status.rev170112.Device1.DeviceStatus;
  32 import org.opendaylight.yang.gen.v1.urn.opendaylight.callhome.device.status.rev170112.Device1Builder;
  33 import org.opendaylight.yang.gen.v1.urn.opendaylight.netconf.node.topology.rev150114.NetconfNode;
  34 import org.opendaylight.yang.gen.v1.urn.opendaylight.netconf.node.topology.rev150114.NetconfNodeConnectionStatus;
  35 import org.opendaylight.yang.gen.v1.urn.opendaylight.netconf.node.topology.rev150114.network.topology.topology.topology.types.TopologyNetconf;
  36 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.netconf.callhome.server.rev161109.NetconfCallhomeServer;
  37 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.netconf.callhome.server.rev161109.netconf.callhome.server.AllowedDevices;
  38 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.netconf.callhome.server.rev161109.netconf.callhome.server.allowed.devices.Device;
  39 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.netconf.callhome.server.rev161109.netconf.callhome.server.allowed.devices.DeviceBuilder;
  40 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.netconf.callhome.server.rev161109.netconf.callhome.server.allowed.devices.DeviceKey;
  41 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.NetworkTopology;
  42 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.NodeId;
  43 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.TopologyId;
  44 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.Topology;
  45 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.TopologyKey;
  46 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.topology.Node;
  47 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.topology.NodeKey;
  48 import org.opendaylight.yangtools.concepts.ListenerRegistration;
  49 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
  50 import org.slf4j.Logger;
  51 import org.slf4j.LoggerFactory;
  52
  53 class CallhomeStatusReporter implements DataTreeChangeListener<Node>, StatusRecorder, AutoCloseable {
  54     private static final InstanceIdentifier<Topology> NETCONF_TOPO_IID =
  55             InstanceIdentifier.create(NetworkTopology.class).child(Topology.class,
  56                     new TopologyKey(new TopologyId(TopologyNetconf.QNAME.getLocalName())));
  57
  58     private static final Logger LOG = LoggerFactory.getLogger(CallhomeStatusReporter.class);
  59
  60     private final DataBroker dataBroker;
  61     private final ListenerRegistration<CallhomeStatusReporter> reg;
  62
  63     CallhomeStatusReporter(final DataBroker broker) {
  64         this.dataBroker = broker;
  65         this.reg = dataBroker.registerDataTreeChangeListener(DataTreeIdentifier.create(LogicalDatastoreType.OPERATIONAL,
  66             NETCONF_TOPO_IID.child(Node.class)), this);
  67     }
  68
  69     @Override
  70     public void onDataTreeChanged(final Collection<DataTreeModification<Node>> changes) {
  71         for (DataTreeModification<Node> change: changes) {
  72             final DataObjectModification<Node> rootNode = change.getRootNode();
  73             final InstanceIdentifier<Node> identifier = change.getRootPath().getRootIdentifier();
  74             switch (rootNode.getModificationType()) {
  75                 case WRITE:
  76                 case SUBTREE_MODIFIED:
  77                     if (isNetconfNode(rootNode.getDataAfter())) {
  78                         NodeId nodeId = getNodeId(identifier);
  79                         if (nodeId != null) {
  80                             NetconfNode nnode = rootNode.getDataAfter().augmentation(NetconfNode.class);
  81                             handledNetconfNode(nodeId, nnode);
  82                         }
  83                     }
  84                     break;
  85                 case DELETE:
  86                     if (isNetconfNode(rootNode.getDataBefore())) {
  87                         final NodeId nodeId = getNodeId(identifier);
  88                         if (nodeId != null) {
  89                             handleDisconnectedNetconfNode(nodeId);
  90                         }
  91                     }
  92                     break;
  93                 default:
  94                     break;
  95             }
  96         }
  97     }
  98
  99     private static boolean isNetconfNode(final Node node) {
 100         return node.augmentation(NetconfNode.class) != null;
 101     }
 102
 103     private static NodeId getNodeId(final InstanceIdentifier<?> path) {
 104         NodeKey key = path.firstKeyOf(Node.class);
 105         return key != null ? key.getNodeId() : null;
 106     }
 107
 108     private void handledNetconfNode(final NodeId nodeId, final NetconfNode nnode) {
 109         NetconfNodeConnectionStatus.ConnectionStatus csts = nnode.getConnectionStatus();
 110
 111         switch (csts) {
 112             case Connected: {
 113                 handleConnectedNetconfNode(nodeId);
 114                 break;
 115             }
 116             default:
 117             case UnableToConnect: {
 118                 handleUnableToConnectNetconfNode(nodeId);
 119                 break;
 120             }
 121         }
 122     }
 123
 124     private void handleConnectedNetconfNode(final NodeId nodeId) {
 125         // Fully connected, all services for remote device are
 126         // available from the MountPointService.
 127         LOG.debug("NETCONF Node: {} is fully connected", nodeId.getValue());
 128
 129         Device opDev = readAndGetDevice(nodeId);
 130         if (opDev == null) {
 131             LOG.warn("No corresponding callhome device found - exiting.");
 132         } else {
 133             Device modifiedDevice = withConnectedStatus(opDev);
 134             if (modifiedDevice == null) {
 135                 return;
 136             }
 137             LOG.info("Setting successful status for callhome device id:{}.", nodeId);
 138             writeDevice(nodeId, modifiedDevice);
 139         }
 140     }
 141
 142     private void handleDisconnectedNetconfNode(final NodeId nodeId) {
 143         LOG.debug("NETCONF Node: {} disconnected", nodeId.getValue());
 144
 145         Device opDev = readAndGetDevice(nodeId);
 146         if (opDev == null) {
 147             LOG.warn("No corresponding callhome device found - exiting.");
 148         } else {
 149             Device modifiedDevice = withDisconnectedStatus(opDev);
 150             if (modifiedDevice == null) {
 151                 return;
 152             }
 153             LOG.info("Setting disconnected status for callhome device id:{}.", nodeId);
 154             writeDevice(nodeId, modifiedDevice);
 155         }
 156     }
 157
 158     private void handleUnableToConnectNetconfNode(final NodeId nodeId) {
 159         // The maximum configured number of reconnect attempts
 160         // have been reached. No more reconnects will be
 161         // attempted by the Netconf Connector.
 162         LOG.debug("NETCONF Node: {} connection failed", nodeId.getValue());
 163
 164         Device opDev = readAndGetDevice(nodeId);
 165         if (opDev == null) {
 166             LOG.warn("No corresponding callhome device found - exiting.");
 167         } else {
 168             Device modifiedDevice = withFailedStatus(opDev);
 169             if (modifiedDevice == null) {
 170                 return;
 171             }
 172             LOG.info("Setting failed status for callhome device id:{}.", nodeId);
 173             writeDevice(nodeId, modifiedDevice);
 174         }
 175     }
 176
 177     void asForceListedDevice(final String id, final PublicKey serverKey) {
 178         NodeId nid = new NodeId(id);
 179         Device device = newDevice(id, serverKey, Device1.DeviceStatus.DISCONNECTED);
 180         writeDevice(nid, device);
 181     }
 182
 183     void asUnlistedDevice(final String id, final PublicKey serverKey) {
 184         NodeId nid = new NodeId(id);
 185         Device device = newDevice(id, serverKey, Device1.DeviceStatus.FAILEDNOTALLOWED);
 186         writeDevice(nid, device);
 187     }
 188
 189     private static Device newDevice(final String id, final PublicKey serverKey, final Device1.DeviceStatus status) {
 190         String sshEncodedKey = serverKey.toString();
 191         try {
 192             sshEncodedKey = AuthorizedKeysDecoder.encodePublicKey(serverKey);
 193         } catch (IOException e) {
 194             LOG.warn("Unable to encode public key to ssh format.", e);
 195         }
 196         return new DeviceBuilder()
 197                 .setUniqueId(id)
 198                 .withKey(new DeviceKey(id))
 199                 .setSshHostKey(sshEncodedKey)
 200                 .addAugmentation(new Device1Builder().setDeviceStatus(Device1.DeviceStatus.FAILEDNOTALLOWED).build())
 201                 .build();
 202     }
 203
 204     private Device readAndGetDevice(final NodeId nodeId) {
 205         return readDevice(nodeId).orElse(null);
 206     }
 207
 208     private Optional<Device> readDevice(final NodeId nodeId) {
 209         try (ReadTransaction opTx = dataBroker.newReadOnlyTransaction()) {
 210             InstanceIdentifier<Device> deviceIID = buildDeviceInstanceIdentifier(nodeId);
 211             return opTx.read(LogicalDatastoreType.OPERATIONAL, deviceIID).get();
 212         } catch (InterruptedException | ExecutionException e) {
 213             return Optional.empty();
 214         }
 215     }
 216
 217     private void writeDevice(final NodeId nodeId, final Device modifiedDevice) {
 218         WriteTransaction opTx = dataBroker.newWriteOnlyTransaction();
 219         opTx.merge(LogicalDatastoreType.OPERATIONAL, buildDeviceInstanceIdentifier(nodeId), modifiedDevice);
 220         commit(opTx, modifiedDevice.key());
 221     }
 222
 223     private static InstanceIdentifier<Device> buildDeviceInstanceIdentifier(final NodeId nodeId) {
 224         return InstanceIdentifier.create(NetconfCallhomeServer.class)
 225                 .child(AllowedDevices.class)
 226                 .child(Device.class, new DeviceKey(nodeId.getValue()));
 227     }
 228
 229     private static Device withConnectedStatus(final Device opDev) {
 230         return deviceWithStatus(opDev, Device1.DeviceStatus.CONNECTED);
 231     }
 232
 233     private static Device withFailedStatus(final Device opDev) {
 234         return deviceWithStatus(opDev, DeviceStatus.FAILED);
 235     }
 236
 237     private static Device withDisconnectedStatus(final Device opDev) {
 238         return deviceWithStatus(opDev, DeviceStatus.DISCONNECTED);
 239     }
 240
 241     private static Device withFailedAuthStatus(final Device opDev) {
 242         return deviceWithStatus(opDev, DeviceStatus.FAILEDAUTHFAILURE);
 243     }
 244
 245     private static Device deviceWithStatus(final Device opDev, final DeviceStatus status) {
 246         return new DeviceBuilder()
 247                 .setUniqueId(opDev.getUniqueId())
 248                 .setSshHostKey(opDev.getSshHostKey())
 249                 .addAugmentation(new Device1Builder().setDeviceStatus(status).build())
 250                 .build();
 251     }
 252
 253     private void setDeviceStatus(final Device device) {
 254         WriteTransaction tx = dataBroker.newWriteOnlyTransaction();
 255         InstanceIdentifier<Device> deviceIId = InstanceIdentifier.create(NetconfCallhomeServer.class)
 256                         .child(AllowedDevices.class)
 257                         .child(Device.class, device.key());
 258
 259         tx.merge(LogicalDatastoreType.OPERATIONAL, deviceIId, device);
 260         commit(tx, device.key());
 261     }
 262
 263     private static void commit(final WriteTransaction tx, final DeviceKey device) {
 264         tx.commit().addCallback(new FutureCallback<CommitInfo>() {
 265             @Override
 266             public void onSuccess(final CommitInfo result) {
 267                 LOG.debug("Device {} committed", device);
 268             }
 269
 270             @Override
 271             public void onFailure(final Throwable cause) {
 272                 LOG.warn("Failed to commit device {}", device, cause);
 273             }
 274         }, MoreExecutors.directExecutor());
 275     }
 276
 277     private AllowedDevices getDevices() {
 278         try (ReadTransaction rxTransaction = dataBroker.newReadOnlyTransaction()) {
 279             return rxTransaction.read(LogicalDatastoreType.OPERATIONAL, IetfZeroTouchCallHomeServerProvider.ALL_DEVICES)
 280                     .get().orElse(null);
 281         } catch (ExecutionException | InterruptedException e) {
 282             LOG.error("Error trying to read the whitelist devices", e);
 283             return null;
 284         }
 285     }
 286
 287     private Collection<Device> getDevicesAsList() {
 288         AllowedDevices devices = getDevices();
 289         return devices == null ? Collections.emptyList() : devices.nonnullDevice().values();
 290     }
 291
 292     @Override
 293     public void reportFailedAuth(final PublicKey sshKey) {
 294         AuthorizedKeysDecoder decoder = new AuthorizedKeysDecoder();
 295
 296         for (Device device : getDevicesAsList()) {
 297             String keyString = device.getSshHostKey();
 298             if (keyString == null) {
 299                 LOG.info("Whitelist device {} does not have a host key, skipping it", device.getUniqueId());
 300                 continue;
 301             }
 302
 303             try {
 304                 PublicKey pubKey = decoder.decodePublicKey(keyString);
 305                 if (sshKey.getAlgorithm().equals(pubKey.getAlgorithm()) && sshKey.equals(pubKey)) {
 306                     Device failedDevice = withFailedAuthStatus(device);
 307                     if (failedDevice == null) {
 308                         return;
 309                     }
 310                     LOG.info("Setting auth failed status for callhome device id:{}.", failedDevice.getUniqueId());
 311                     setDeviceStatus(failedDevice);
 312                     return;
 313                 }
 314             } catch (GeneralSecurityException e) {
 315                 LOG.error("Failed decoding a device key with host key: {}", keyString, e);
 316                 return;
 317             }
 318         }
 319
 320         LOG.error("No match found for the failed auth device (should have been filtered by whitelist). Key: {}",
 321                 sshKey);
 322     }
 323
 324     @Override
 325     public void close() {
 326         reg.close();
 327     }
 328 }