SocketReader.java 18.9 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466
/**
 * $RCSfile$
 * $Revision: 3187 $
 * $Date: 2005-12-11 13:34:34 -0300 (Sun, 11 Dec 2005) $
 *
 * Copyright (C) 2007 Jive Software. All rights reserved.
 *
 * This software is published under the terms of the GNU Public License (GPL),
 * a copy of which is included in this distribution.
 */

package org.jivesoftware.openfire.net;

import org.dom4j.Element;
import org.dom4j.io.XMPPPacketReader;
import org.jivesoftware.openfire.Connection;
import org.jivesoftware.openfire.PacketRouter;
import org.jivesoftware.openfire.RoutingTable;
import org.jivesoftware.openfire.auth.UnauthorizedException;
import org.jivesoftware.openfire.session.LocalSession;
import org.jivesoftware.openfire.session.Session;
import org.jivesoftware.util.LocaleUtils;
import org.jivesoftware.util.Log;
import org.jivesoftware.util.StringUtils;
import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;
import org.xmlpull.v1.XmlPullParserFactory;
import org.xmpp.packet.*;

import java.io.IOException;
import java.net.Socket;

/**
 * A SocketReader creates the appropriate {@link Session} based on the defined namespace in the
 * stream element and will then keep reading and routing the received packets.
 *
 * @author Gaston Dombiak
 */
public abstract class SocketReader implements Runnable {

    /**
     * The utf-8 charset for decoding and encoding Jabber packet streams.
     */
    private static String CHARSET = "UTF-8";
    /**
     * Reuse the same factory for all the connections.
     */
    private static XmlPullParserFactory factory = null;

    /**
     * Session associated with the socket reader.
     */
    protected LocalSession session;
    /**
     * Reference to the physical connection.
     */
    protected SocketConnection connection;
    /**
     * Server name for which we are attending clients.
     */
    protected String serverName;

    /**
     * Router used to route incoming packets to the correct channels.
     */
    private PacketRouter router;
    /**
     * Routing table used for checking whether a domain is known or not.
     */
    private RoutingTable routingTable;
    /**
     * Specifies whether the socket is using blocking or non-blocking connections.
     */
    private SocketReadingMode readingMode;
    XMPPPacketReader reader = null;
    protected boolean open;

    static {
        try {
            factory = XmlPullParserFactory.newInstance(MXParser.class.getName(), null);
        }
        catch (XmlPullParserException e) {
            Log.error("Error creating a parser factory", e);
        }
    }

    /**
     * Creates a dedicated reader for a socket.
     *
     * @param router the router for sending packets that were read.
     * @param routingTable the table that keeps routes to registered services.
     * @param serverName the name of the server this socket is working for.
     * @param socket the socket to read from.
     * @param connection the connection being read.
     * @param useBlockingMode true means that the server will use a thread per connection.
     */
    public SocketReader(PacketRouter router, RoutingTable routingTable, String serverName,
            Socket socket, SocketConnection connection, boolean useBlockingMode) {
        this.serverName = serverName;
        this.router = router;
        this.routingTable = routingTable;
        this.connection = connection;

        connection.setSocketReader(this);

        // Reader is associated with a new XMPPPacketReader
        reader = new XMPPPacketReader();
        reader.setXPPFactory(factory);

        // Set the blocking reading mode to use
        readingMode = new BlockingReadingMode(socket, this);
    }

    /**
     * A dedicated thread loop for reading the stream and sending incoming
     * packets to the appropriate router.
     */
    public void run() {
        readingMode.run();
    }

    protected void process(Element doc) throws Exception {
        if (doc == null) {
            return;
        }

        String tag = doc.getName();
        if ("message".equals(tag)) {
            Message packet;
            try {
                packet = new Message(doc);
            }
            catch(IllegalArgumentException e) {
                Log.debug("Rejecting packet. JID malformed", e);
                // The original packet contains a malformed JID so answer with an error.
                Message reply = new Message();
                reply.setID(doc.attributeValue("id"));
                reply.setTo(session.getAddress());
                reply.getElement().addAttribute("from", doc.attributeValue("to"));
                reply.setError(PacketError.Condition.jid_malformed);
                session.process(reply);
                return;
            }
            processMessage(packet);
        }
        else if ("presence".equals(tag)) {
            Presence packet;
            try {
                packet = new Presence(doc);
            }
            catch (IllegalArgumentException e) {
                Log.debug("Rejecting packet. JID malformed", e);
                // The original packet contains a malformed JID so answer an error
                Presence reply = new Presence();
                reply.setID(doc.attributeValue("id"));
                reply.setTo(session.getAddress());
                reply.getElement().addAttribute("from", doc.attributeValue("to"));
                reply.setError(PacketError.Condition.jid_malformed);
                session.process(reply);
                return;
            }
            // Check that the presence type is valid. If not then assume available type
            try {
                packet.getType();
            }
            catch (IllegalArgumentException e) {
                Log.warn("Invalid presence type", e);
                // The presence packet contains an invalid presence type so replace it with
                // an available presence type
                packet.setType(null);
            }
            // Check that the presence show is valid. If not then assume available show value
            try {
                packet.getShow();
            }
            catch (IllegalArgumentException e) {
                Log.warn("Invalid presence show", e);
                // The presence packet contains an invalid presence show so replace it with
                // an available presence show
                packet.setShow(null);
            }
            if (session.getStatus() == Session.STATUS_CLOSED && packet.isAvailable()) {
                // Ignore available presence packets sent from a closed session. A closed
                // session may have buffered data pending to be processes so we want to ignore
                // just Presences of type available
                Log.warn("Ignoring available presence packet of closed session: " + packet);
                return;
            }
            processPresence(packet);
        }
        else if ("iq".equals(tag)) {
            IQ packet;
            try {
                packet = getIQ(doc);
            }
            catch(IllegalArgumentException e) {
                Log.debug("Rejecting packet. JID malformed", e);
                // The original packet contains a malformed JID so answer an error
                IQ reply = new IQ();
                if (!doc.elements().isEmpty()) {
                    reply.setChildElement(((Element) doc.elements().get(0)).createCopy());
                }
                reply.setID(doc.attributeValue("id"));
                reply.setTo(session.getAddress());
                if (doc.attributeValue("to") != null) {
                    reply.getElement().addAttribute("from", doc.attributeValue("to"));
                }
                reply.setError(PacketError.Condition.jid_malformed);
                session.process(reply);
                return;
            }
            processIQ(packet);
        }
        else
        {
            if (!processUnknowPacket(doc)) {
                Log.warn(LocaleUtils.getLocalizedString("admin.error.packet.tag") +
                        doc.asXML());
                open = false;
            }
        }
    }

    /**
     * Process the received IQ packet. Registered
     * {@link org.jivesoftware.openfire.interceptor.PacketInterceptor} will be invoked before
     * and after the packet was routed.<p>
     *
     * Subclasses may redefine this method for different reasons such as modifying the sender
     * of the packet to avoid spoofing, rejecting the packet or even process the packet in
     * another thread.
     *
     * @param packet the received packet.
     */
    protected void processIQ(IQ packet) throws UnauthorizedException {
        // Ensure that connection was secured if TLS was required
        if (connection.getTlsPolicy() == Connection.TLSPolicy.required &&
                !connection.isSecure()) {
            closeNeverSecuredConnection();
            return;
        }
        router.route(packet);
        session.incrementClientPacketCount();
    }

    /**
     * Process the received Presence packet. Registered
     * {@link org.jivesoftware.openfire.interceptor.PacketInterceptor} will be invoked before
     * and after the packet was routed.<p>
     *
     * Subclasses may redefine this method for different reasons such as modifying the sender
     * of the packet to avoid spoofing, rejecting the packet or even process the packet in
     * another thread.
     *
     * @param packet the received packet.
     */
    protected void processPresence(Presence packet) throws UnauthorizedException {
        // Ensure that connection was secured if TLS was required
        if (connection.getTlsPolicy() == Connection.TLSPolicy.required &&
                !connection.isSecure()) {
            closeNeverSecuredConnection();
            return;
        }
        router.route(packet);
        session.incrementClientPacketCount();
    }

    /**
     * Process the received Message packet. Registered
     * {@link org.jivesoftware.openfire.interceptor.PacketInterceptor} will be invoked before
     * and after the packet was routed.<p>
     *
     * Subclasses may redefine this method for different reasons such as modifying the sender
     * of the packet to avoid spoofing, rejecting the packet or even process the packet in
     * another thread.
     *
     * @param packet the received packet.
     */
    protected void processMessage(Message packet) throws UnauthorizedException {
        // Ensure that connection was secured if TLS was required
        if (connection.getTlsPolicy() == Connection.TLSPolicy.required &&
                !connection.isSecure()) {
            closeNeverSecuredConnection();
            return;
        }
        router.route(packet);
        session.incrementClientPacketCount();
    }

    /**
     * Returns true if a received packet of an unkown type (i.e. not a Message, Presence
     * or IQ) has been processed. If the packet was not processed then an exception will
     * be thrown which will make the thread to stop processing further packets.
     *
     * @param doc the DOM element of an unkown type.
     * @return  true if a received packet has been processed.
     */
    abstract boolean processUnknowPacket(Element doc);

    /**
     * Returns the last time a full Document was read or a heartbeat was received. Hearbeats
     * are represented as whitespaces received while a Document is not being parsed.
     *
     * @return the time in milliseconds when the last document or heartbeat was received.
     */
    long getLastActive() {
        return reader.getLastActive();
    }

    /**
     * Returns a name that identifies the type of reader and the unique instance.
     *
     * @return a name that identifies the type of reader and the unique instance.
     */
    abstract String getName();

    /**
     * Close the connection since TLS was mandatory and the entity never negotiated TLS. Before
     * closing the connection a stream error will be sent to the entity.
     */
    void closeNeverSecuredConnection() {
        // Set the not_authorized error
        StreamError error = new StreamError(StreamError.Condition.not_authorized);
        // Deliver stanza
        connection.deliverRawText(error.toXML());
        // Close the underlying connection
        connection.close();
        // Log a warning so that admins can track this case from the server side
        Log.warn("TLS was required by the server and connection was never secured. " +
                "Closing connection : " + connection);
    }

    private IQ getIQ(Element doc) {
        Element query = doc.element("query");
        if (query != null && "jabber:iq:roster".equals(query.getNamespaceURI())) {
            return new Roster(doc);
        }
        else {
            return new IQ(doc);
        }
    }

    /**
     * Uses the XPP to grab the opening stream tag and create an active session
     * object. The session to create will depend on the sent namespace. In all
     * cases, the method obtains the opening stream tag, checks for errors, and
     * either creates a session or returns an error and kills the connection.
     * If the connection remains open, the XPP will be set to be ready for the
     * first packet. A call to next() should result in an START_TAG state with
     * the first packet in the stream.
     */
    protected void createSession()
            throws UnauthorizedException, XmlPullParserException, IOException {
        XmlPullParser xpp = reader.getXPPParser();
        for (int eventType = xpp.getEventType(); eventType != XmlPullParser.START_TAG;) {
            eventType = xpp.next();
        }

        // Check that the TO attribute of the stream header matches the server name or a valid
        // subdomain. If the value of the 'to' attribute is not valid then return a host-unknown
        // error and close the underlying connection.
        String host = reader.getXPPParser().getAttributeValue("", "to");
        if (validateHost() && isHostUnknown(host)) {
            StringBuilder sb = new StringBuilder(250);
            sb.append("<?xml version='1.0' encoding='");
            sb.append(CHARSET);
            sb.append("'?>");
            // Append stream header
            sb.append("<stream:stream ");
            sb.append("from=\"").append(serverName).append("\" ");
            sb.append("id=\"").append(StringUtils.randomString(5)).append("\" ");
            sb.append("xmlns=\"").append(xpp.getNamespace(null)).append("\" ");
            sb.append("xmlns:stream=\"").append(xpp.getNamespace("stream")).append("\" ");
            sb.append("version=\"1.0\">");
            // Set the host_unknown error
            StreamError error = new StreamError(StreamError.Condition.host_unknown);
            sb.append(error.toXML());
            // Deliver stanza
            connection.deliverRawText(sb.toString());
            // Close the underlying connection
            connection.close();
            // Log a warning so that admins can track this cases from the server side
            Log.warn("Closing session due to incorrect hostname in stream header. Host: " + host +
                    ". Connection: " + connection);
        }

        // Create the correct session based on the sent namespace. At this point the server
        // may offer the client to secure the connection. If the client decides to secure
        // the connection then a <starttls> stanza should be received
        else if (!createSession(xpp.getNamespace(null))) {
            // No session was created because of an invalid namespace prefix so answer a stream
            // error and close the underlying connection
            StringBuilder sb = new StringBuilder(250);
            sb.append("<?xml version='1.0' encoding='");
            sb.append(CHARSET);
            sb.append("'?>");
            // Append stream header
            sb.append("<stream:stream ");
            sb.append("from=\"").append(serverName).append("\" ");
            sb.append("id=\"").append(StringUtils.randomString(5)).append("\" ");
            sb.append("xmlns=\"").append(xpp.getNamespace(null)).append("\" ");
            sb.append("xmlns:stream=\"").append(xpp.getNamespace("stream")).append("\" ");
            sb.append("version=\"1.0\">");
            // Include the bad-namespace-prefix in the response
            StreamError error = new StreamError(StreamError.Condition.bad_namespace_prefix);
            sb.append(error.toXML());
            connection.deliverRawText(sb.toString());
            // Close the underlying connection
            connection.close();
            // Log a warning so that admins can track this cases from the server side
            Log.warn("Closing session due to bad_namespace_prefix in stream header. Prefix: " +
                    xpp.getNamespace(null) + ". Connection: " + connection);
        }
    }

    private boolean isHostUnknown(String host) {
        if (host == null) {
            // Answer false since when using server dialback the stream header will not
            // have a TO attribute
            return false;
        }
        if (serverName.equals(host)) {
            // requested host matched the server name
            return false;
        }
        // Check if the host matches a subdomain of this host
        return !routingTable.hasComponentRoute(new JID(host));
    }

    /**
     * Returns the stream namespace. (E.g. jabber:client, jabber:server, etc.).
     *
     * @return the stream namespace.
     */
    abstract String getNamespace();

    /**
     * Returns true if the value of the 'to' attribute in the stream header should be
     * validated. If the value of the 'to' attribute is not valid then a host-unknown error
     * will be returned and the underlying connection will be closed.
     *
     * @return true if the value of the 'to' attribute in the initial stream header should be
     *         validated.
     */
    abstract boolean validateHost();

    /**
     * Notification message indicating that the SocketReader is shutting down. The thread will
     * stop reading and processing new requests. Subclasses may want to redefine this message
     * for releasing any resource they might need.
     */
    protected void shutdown() {
    }

    /**
     * Creates the appropriate {@link org.jivesoftware.openfire.session.Session} subclass based on the specified namespace.
     *
     * @param namespace the namespace sent in the stream element. eg. jabber:client.
     * @return the created session or null.
     * @throws UnauthorizedException
     * @throws XmlPullParserException
     * @throws IOException
     */
    abstract boolean createSession(String namespace) throws UnauthorizedException,
            XmlPullParserException, IOException;
}