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https://github.com/vanitasvitae/Smack.git
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Process only requested roster results (SMACK-538)
Prior to this change, Smack processes each RosterPacket (which is not of type IQ.Type.RESULT) as a roster result. Any other client on the XMPP network can send such a packet (not only our server). This allows a malicious party to overwrite our Roster. This patch changes smack so that a RosterPacket is discarded if it is not a reply to a roster request.
This commit is contained in:
Lars Noschinski
Florian Schmaus
parent
6c7296a37b
commit
9ac882241a
1 changed files with 134 additions and 108 deletions
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@ -115,7 +115,7 @@ public class Roster {
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presenceMap = new ConcurrentHashMap<String, Map<String, Presence>>();
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// Listen for any roster packets.
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PacketFilter rosterFilter = new PacketTypeFilter(RosterPacket.class);
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connection.addPacketListener(new RosterPacketListener(), rosterFilter);
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connection.addPacketListener(new RosterPushListener(), rosterFilter);
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// Listen for any presence packets.
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PacketFilter presenceFilter = new PacketTypeFilter(Presence.class);
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presencePacketListener = new PresencePacketListener();
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@ -200,9 +200,9 @@ public class Roster {
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RosterPacket packet = new RosterPacket();
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if (rosterStore != null && connection.isRosterVersioningSupported()) {
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packet.setVersion(rosterStore.getRosterVersion());
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PacketFilter filter = new IQReplyFilter(packet, connection);
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connection.addPacketListener(new RosterResultListener(), filter);
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}
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PacketFilter filter = new IQReplyFilter(packet, connection);
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connection.addPacketListener(new RosterResultListener(), filter);
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connection.sendPacket(packet);
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}
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@ -727,6 +727,37 @@ public class Roster {
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}
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/**
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* Removes all the groups with no entries.
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*
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* This is used by {@link RosterPushListener} and {@link RosterResultListener} to
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* cleanup groups after removing contacts.
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*/
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private void removeEmptyGroups() {
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// We have to do this because RosterGroup.removeEntry removes the entry immediately
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// (locally) and the group could remain empty.
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// TODO Check the performance/logic for rosters with large number of groups
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for (RosterGroup group : getGroups()) {
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if (group.getEntryCount() == 0) {
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groups.remove(group.getName());
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}
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}
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}
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/**
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* Ignore ItemTypes as of RFC 6121, 2.1.2.5.
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*
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* This is used by {@link RosterPushListener} and {@link RosterResultListener}.
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* */
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private boolean hasValidSubscriptionType(RosterPacket.Item item) {
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return item.getItemType().equals(RosterPacket.ItemType.none)
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|| item.getItemType().equals(RosterPacket.ItemType.from)
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|| item.getItemType().equals(RosterPacket.ItemType.to)
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|| item.getItemType().equals(RosterPacket.ItemType.both);
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}
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/**
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* An enumeration for the subscription mode options.
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*/
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@ -879,95 +910,122 @@ public class Roster {
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@Override
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public void processPacket(Packet packet) {
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connection.removePacketListener(this);
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if (packet instanceof RosterPacket) {
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// Non-empty roster results are processed by the RosterPacketListener class
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return;
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}
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if (!(packet instanceof IQ)) {
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return;
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}
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IQ result = (IQ)packet;
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if(result.getType().equals(IQ.Type.RESULT)){
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Collection<String> addedEntries = new ArrayList<String>();
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Collection<String> updatedEntries = new ArrayList<String>();
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for(RosterPacket.Item item : rosterStore.getEntries()){
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RosterEntry entry = new RosterEntry(item.getUser(), item.getName(),
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item.getItemType(), item.getItemStatus(), Roster.this, connection);
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addUpdateEntry(addedEntries,updatedEntries,item,entry);
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}
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synchronized (Roster.this) {
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rosterInitialized = true;
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Roster.this.notifyAll();
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}
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fireRosterChangedEvent(addedEntries,updatedEntries,
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Collections.<String>emptyList());
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if (!result.getType().equals(IQ.Type.RESULT)) {
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return;
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}
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}
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}
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/**
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* Listens for all roster packets and processes them.
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*/
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private class RosterPacketListener implements PacketListener {
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public void processPacket(Packet packet) {
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RosterPacket rosterPacket = (RosterPacket) packet;
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Collection<String> addedEntries = new ArrayList<String>();
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Collection<String> updatedEntries = new ArrayList<String>();
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Collection<String> deletedEntries = new ArrayList<String>();
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String version = rosterPacket.getVersion();
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if (rosterPacket.getType().equals(IQ.Type.SET)) {
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// Roster push (RFC 6121, 2.1.6)
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// A roster push with a non-empty from not matching our address MUST be ignored
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String jid = StringUtils.parseBareAddress(connection.getUser());
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if (rosterPacket.getFrom() != null &&
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!rosterPacket.getFrom().equals(jid)) {
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return;
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}
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// A roster push must contain exactly one entry
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Collection<Item> items = rosterPacket.getRosterItems();
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if (items.size() != 1) {
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return;
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}
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Item item = items.iterator().next();
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processPushItem(addedEntries, updatedEntries, deletedEntries, version, item);
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connection.sendPacket(IQ.createResultIQ(rosterPacket));
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}
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else {
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// Roster result (RFC 6121, 2.1.4)
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// Ignore items without valid subscription type
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ArrayList<Item> validItems = new ArrayList<RosterPacket.Item>();
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for (RosterPacket.Item item : rosterPacket.getRosterItems()) {
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if (hasValidSubscriptionType(item)) {
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validItems.add(item);
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}
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}
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processResult(addedEntries, updatedEntries, deletedEntries, version, validItems);
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if (packet instanceof RosterPacket) {
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nonemptyResult((RosterPacket) packet, addedEntries, updatedEntries, deletedEntries);
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} else {
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emptyResult(addedEntries, updatedEntries);
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}
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// Remove all the groups with no entries. We have to do this because
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// RosterGroup.removeEntry removes the entry immediately (locally) and the
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// group could remain empty.
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// TODO Check the performance/logic for rosters with large number of groups
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for (RosterGroup group : getGroups()) {
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if (group.getEntryCount() == 0) {
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groups.remove(group.getName());
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}
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}
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// Mark the roster as initialized.
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synchronized (Roster.this) {
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rosterInitialized = true;
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Roster.this.notifyAll();
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}
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// Fire event for roster listeners.
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fireRosterChangedEvent(addedEntries, updatedEntries, deletedEntries);
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}
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private void emptyResult(Collection<String> addedEntries, Collection<String> updatedEntries) {
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for(RosterPacket.Item item : rosterStore.getEntries()){
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RosterEntry entry = new RosterEntry(item.getUser(), item.getName(),
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item.getItemType(), item.getItemStatus(), Roster.this, connection);
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addUpdateEntry(addedEntries,updatedEntries,item,entry);
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}
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}
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private void addEntries(Collection<String> addedEntries, Collection<String> updatedEntries,
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Collection<String> deletedEntries, String version, Collection<Item> items) {
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for (RosterPacket.Item item : items) {
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RosterEntry entry = new RosterEntry(item.getUser(), item.getName(),
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item.getItemType(), item.getItemStatus(), Roster.this, connection);
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addUpdateEntry(addedEntries, updatedEntries, item, entry);
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}
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List<String> toDelete = new ArrayList<String>();
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// Delete all entries which where not added or updated
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for (RosterEntry entry : entries.values()) {
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toDelete.add(entry.getUser());
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}
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toDelete.removeAll(addedEntries);
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toDelete.removeAll(updatedEntries);
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for (String user : toDelete) {
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deleteEntry(deletedEntries, entries.get(user));
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}
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if (rosterStore != null) {
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rosterStore.resetEntries(items, version);
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}
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}
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private void nonemptyResult(RosterPacket packet, Collection<String> addedEntries, Collection<String> updatedEntries, Collection<String> deletedEntries) {
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RosterPacket rosterPacket = (RosterPacket) packet;
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String version = rosterPacket.getVersion();
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// Ignore items without valid subscription type
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ArrayList<Item> validItems = new ArrayList<RosterPacket.Item>();
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for (RosterPacket.Item item : rosterPacket.getRosterItems()) {
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if (hasValidSubscriptionType(item)) {
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validItems.add(item);
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}
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}
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addEntries(addedEntries, updatedEntries, deletedEntries, version, validItems);
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removeEmptyGroups();
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}
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}
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/**
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* Listens for all roster pushes and processes them.
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*/
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private class RosterPushListener implements PacketListener {
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public void processPacket(Packet packet) {
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RosterPacket rosterPacket = (RosterPacket) packet;
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if (!rosterPacket.getType().equals(IQ.Type.SET)) {
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return;
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}
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String version = rosterPacket.getVersion();
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// Roster push (RFC 6121, 2.1.6)
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// A roster push with a non-empty from not matching our address MUST be ignored
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String jid = StringUtils.parseBareAddress(connection.getUser());
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if (rosterPacket.getFrom() != null &&
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!rosterPacket.getFrom().equals(jid)) {
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return;
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}
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// A roster push must contain exactly one entry
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Collection<Item> items = rosterPacket.getRosterItems();
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if (items.size() != 1) {
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return;
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}
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Collection<String> addedEntries = new ArrayList<String>();
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Collection<String> updatedEntries = new ArrayList<String>();
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Collection<String> deletedEntries = new ArrayList<String>();
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Item item = items.iterator().next();
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processPushItem(addedEntries, updatedEntries, deletedEntries, version, item);
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connection.sendPacket(IQ.createResultIQ(rosterPacket));
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removeEmptyGroups();
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// Fire event for roster listeners.
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fireRosterChangedEvent(addedEntries, updatedEntries, deletedEntries);
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@ -992,38 +1050,6 @@ public class Roster {
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}
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}
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private void processResult(Collection<String> addedEntries, Collection<String> updatedEntries,
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Collection<String> deletedEntries, String version, Collection<Item> items) {
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for (RosterPacket.Item item : items) {
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RosterEntry entry = new RosterEntry(item.getUser(), item.getName(),
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item.getItemType(), item.getItemStatus(), Roster.this, connection);
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addUpdateEntry(addedEntries, updatedEntries, item, entry);
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}
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List<String> toDelete = new ArrayList<String>();
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// Delete all entries which where not added or updated
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for (RosterEntry entry : entries.values()) {
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toDelete.add(entry.getUser());
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}
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toDelete.removeAll(addedEntries);
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toDelete.removeAll(updatedEntries);
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for (String user : toDelete) {
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deleteEntry(deletedEntries, entries.get(user));
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}
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if (rosterStore != null) {
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rosterStore.resetEntries(items, version);
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}
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}
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/* Ignore ItemTypes as of RFC 6121, 2.1.2.5. */
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private boolean hasValidSubscriptionType(RosterPacket.Item item) {
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return item.getItemType().equals(RosterPacket.ItemType.none)
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|| item.getItemType().equals(RosterPacket.ItemType.from)
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|| item.getItemType().equals(RosterPacket.ItemType.to)
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|| item.getItemType().equals(RosterPacket.ItemType.both);
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}
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}
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}
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