conversations-classic/src/main/java/eu/siacs/conversations/parser/IqParser.java

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package eu.siacs.conversations.parser;
import android.support.annotation.NonNull;
import android.util.Base64;
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import android.util.Log;
import android.util.Pair;
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import org.whispersystems.libaxolotl.IdentityKey;
import org.whispersystems.libaxolotl.ecc.Curve;
import org.whispersystems.libaxolotl.ecc.ECPublicKey;
import org.whispersystems.libaxolotl.state.PreKeyBundle;
import java.io.ByteArrayInputStream;
import java.security.cert.CertificateException;
import java.security.cert.CertificateFactory;
import java.security.cert.X509Certificate;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
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import eu.siacs.conversations.Config;
import eu.siacs.conversations.crypto.axolotl.AxolotlService;
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import eu.siacs.conversations.entities.Account;
import eu.siacs.conversations.entities.Contact;
import eu.siacs.conversations.services.XmppConnectionService;
import eu.siacs.conversations.utils.Xmlns;
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import eu.siacs.conversations.xml.Element;
import eu.siacs.conversations.xmpp.OnIqPacketReceived;
import eu.siacs.conversations.xmpp.OnUpdateBlocklist;
import eu.siacs.conversations.xmpp.jid.Jid;
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import eu.siacs.conversations.xmpp.stanzas.IqPacket;
public class IqParser extends AbstractParser implements OnIqPacketReceived {
public IqParser(final XmppConnectionService service) {
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super(service);
}
private void rosterItems(final Account account, final Element query) {
final String version = query.getAttribute("ver");
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if (version != null) {
account.getRoster().setVersion(version);
}
for (final Element item : query.getChildren()) {
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if (item.getName().equals("item")) {
final Jid jid = item.getAttributeAsJid("jid");
if (jid == null) {
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continue;
}
final String name = item.getAttribute("name");
final String subscription = item.getAttribute("subscription");
final Contact contact = account.getRoster().getContact(jid);
boolean bothPre = contact.getOption(Contact.Options.TO) && contact.getOption(Contact.Options.FROM);
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if (!contact.getOption(Contact.Options.DIRTY_PUSH)) {
contact.setServerName(name);
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contact.parseGroupsFromElement(item);
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}
if (subscription != null) {
if (subscription.equals("remove")) {
contact.resetOption(Contact.Options.IN_ROSTER);
contact.resetOption(Contact.Options.DIRTY_DELETE);
contact.resetOption(Contact.Options.PREEMPTIVE_GRANT);
} else {
contact.setOption(Contact.Options.IN_ROSTER);
contact.resetOption(Contact.Options.DIRTY_PUSH);
contact.parseSubscriptionFromElement(item);
}
}
boolean both = contact.getOption(Contact.Options.TO) && contact.getOption(Contact.Options.FROM);
if ((both != bothPre) && both) {
Log.d(Config.LOGTAG,account.getJid().toBareJid()+": gained mutual presence subscription with "+contact.getJid());
AxolotlService axolotlService = account.getAxolotlService();
if (axolotlService != null) {
axolotlService.clearErrorsInFetchStatusMap(contact.getJid());
}
}
mXmppConnectionService.getAvatarService().clear(contact);
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}
}
mXmppConnectionService.updateConversationUi();
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mXmppConnectionService.updateRosterUi();
}
public String avatarData(final IqPacket packet) {
final Element pubsub = packet.findChild("pubsub",
"http://jabber.org/protocol/pubsub");
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if (pubsub == null) {
return null;
}
final Element items = pubsub.findChild("items");
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if (items == null) {
return null;
}
return super.avatarData(items);
}
public Element getItem(final IqPacket packet) {
final Element pubsub = packet.findChild("pubsub",
"http://jabber.org/protocol/pubsub");
if (pubsub == null) {
return null;
}
final Element items = pubsub.findChild("items");
if (items == null) {
return null;
}
return items.findChild("item");
}
@NonNull
public Set<Integer> deviceIds(final Element item) {
Set<Integer> deviceIds = new HashSet<>();
if (item != null) {
final Element list = item.findChild("list");
if (list != null) {
for (Element device : list.getChildren()) {
if (!device.getName().equals("device")) {
continue;
}
try {
Integer id = Integer.valueOf(device.getAttribute("id"));
deviceIds.add(id);
} catch (NumberFormatException e) {
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Log.e(Config.LOGTAG, AxolotlService.LOGPREFIX+" : "+"Encountered invalid <device> node in PEP ("+e.getMessage()+"):" + device.toString()+ ", skipping...");
continue;
}
}
}
}
return deviceIds;
}
public Integer signedPreKeyId(final Element bundle) {
final Element signedPreKeyPublic = bundle.findChild("signedPreKeyPublic");
if(signedPreKeyPublic == null) {
return null;
}
return Integer.valueOf(signedPreKeyPublic.getAttribute("signedPreKeyId"));
}
public ECPublicKey signedPreKeyPublic(final Element bundle) {
ECPublicKey publicKey = null;
final Element signedPreKeyPublic = bundle.findChild("signedPreKeyPublic");
if(signedPreKeyPublic == null) {
return null;
}
try {
publicKey = Curve.decodePoint(Base64.decode(signedPreKeyPublic.getContent(),Base64.DEFAULT), 0);
} catch (Throwable e) {
Log.e(Config.LOGTAG, AxolotlService.LOGPREFIX+" : "+"Invalid signedPreKeyPublic in PEP: " + e.getMessage());
}
return publicKey;
}
public byte[] signedPreKeySignature(final Element bundle) {
final Element signedPreKeySignature = bundle.findChild("signedPreKeySignature");
if(signedPreKeySignature == null) {
return null;
}
try {
return Base64.decode(signedPreKeySignature.getContent(), Base64.DEFAULT);
} catch (Throwable e) {
Log.e(Config.LOGTAG,AxolotlService.LOGPREFIX+" : Invalid base64 in signedPreKeySignature");
return null;
}
}
public IdentityKey identityKey(final Element bundle) {
IdentityKey identityKey = null;
final Element identityKeyElement = bundle.findChild("identityKey");
if(identityKeyElement == null) {
return null;
}
try {
identityKey = new IdentityKey(Base64.decode(identityKeyElement.getContent(), Base64.DEFAULT), 0);
} catch (Throwable e) {
Log.e(Config.LOGTAG,AxolotlService.LOGPREFIX+" : "+"Invalid identityKey in PEP: "+e.getMessage());
}
return identityKey;
}
public Map<Integer, ECPublicKey> preKeyPublics(final IqPacket packet) {
Map<Integer, ECPublicKey> preKeyRecords = new HashMap<>();
Element item = getItem(packet);
if (item == null) {
Log.d(Config.LOGTAG, AxolotlService.LOGPREFIX+" : "+"Couldn't find <item> in bundle IQ packet: " + packet);
return null;
}
final Element bundleElement = item.findChild("bundle");
if(bundleElement == null) {
return null;
}
final Element prekeysElement = bundleElement.findChild("prekeys");
if(prekeysElement == null) {
Log.d(Config.LOGTAG, AxolotlService.LOGPREFIX+" : "+"Couldn't find <prekeys> in bundle IQ packet: " + packet);
return null;
}
for(Element preKeyPublicElement : prekeysElement.getChildren()) {
if(!preKeyPublicElement.getName().equals("preKeyPublic")){
Log.d(Config.LOGTAG, AxolotlService.LOGPREFIX+" : "+"Encountered unexpected tag in prekeys list: " + preKeyPublicElement);
continue;
}
Integer preKeyId = Integer.valueOf(preKeyPublicElement.getAttribute("preKeyId"));
try {
ECPublicKey preKeyPublic = Curve.decodePoint(Base64.decode(preKeyPublicElement.getContent(), Base64.DEFAULT), 0);
preKeyRecords.put(preKeyId, preKeyPublic);
} catch (Throwable e) {
Log.e(Config.LOGTAG, AxolotlService.LOGPREFIX+" : "+"Invalid preKeyPublic (ID="+preKeyId+") in PEP: "+ e.getMessage()+", skipping...");
continue;
}
}
return preKeyRecords;
}
public Pair<X509Certificate[],byte[]> verification(final IqPacket packet) {
Element item = getItem(packet);
Element verification = item != null ? item.findChild("verification",AxolotlService.PEP_PREFIX) : null;
Element chain = verification != null ? verification.findChild("chain") : null;
Element signature = verification != null ? verification.findChild("signature") : null;
if (chain != null && signature != null) {
List<Element> certElements = chain.getChildren();
X509Certificate[] certificates = new X509Certificate[certElements.size()];
try {
CertificateFactory certificateFactory = CertificateFactory.getInstance("X.509");
int i = 0;
for(Element cert : certElements) {
certificates[i] = (X509Certificate) certificateFactory.generateCertificate(new ByteArrayInputStream(Base64.decode(cert.getContent(),Base64.DEFAULT)));
++i;
}
return new Pair<>(certificates,Base64.decode(signature.getContent(),Base64.DEFAULT));
} catch (CertificateException e) {
return null;
}
} else {
return null;
}
}
public PreKeyBundle bundle(final IqPacket bundle) {
Element bundleItem = getItem(bundle);
if(bundleItem == null) {
return null;
}
final Element bundleElement = bundleItem.findChild("bundle");
if(bundleElement == null) {
return null;
}
ECPublicKey signedPreKeyPublic = signedPreKeyPublic(bundleElement);
Integer signedPreKeyId = signedPreKeyId(bundleElement);
byte[] signedPreKeySignature = signedPreKeySignature(bundleElement);
IdentityKey identityKey = identityKey(bundleElement);
if(signedPreKeyPublic == null || identityKey == null) {
return null;
}
return new PreKeyBundle(0, 0, 0, null,
signedPreKeyId, signedPreKeyPublic, signedPreKeySignature, identityKey);
}
public List<PreKeyBundle> preKeys(final IqPacket preKeys) {
List<PreKeyBundle> bundles = new ArrayList<>();
Map<Integer, ECPublicKey> preKeyPublics = preKeyPublics(preKeys);
if ( preKeyPublics != null) {
for (Integer preKeyId : preKeyPublics.keySet()) {
ECPublicKey preKeyPublic = preKeyPublics.get(preKeyId);
bundles.add(new PreKeyBundle(0, 0, preKeyId, preKeyPublic,
0, null, null, null));
}
}
return bundles;
}
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@Override
public void onIqPacketReceived(final Account account, final IqPacket packet) {
if (Config.BACKGROUND_STANZA_LOGGING && (packet.getType() == IqPacket.TYPE.GET || packet.getType() == IqPacket.TYPE.SET)) {
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Element first = packet.getChildren().size() > 0 ? packet.getChildren().get(0) : null;
Log.d(Config.LOGTAG,account.getJid().toBareJid()+": IQ request from "+packet.getFrom()+(first == null ? "" : " "+first));
}
if (packet.getType() == IqPacket.TYPE.ERROR || packet.getType() == IqPacket.TYPE.TIMEOUT) {
return;
} else if (packet.hasChild("query", Xmlns.ROSTER) && packet.fromServer(account)) {
final Element query = packet.findChild("query");
// If this is in response to a query for the whole roster:
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if (packet.getType() == IqPacket.TYPE.RESULT) {
account.getRoster().markAllAsNotInRoster();
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}
this.rosterItems(account, query);
} else if ((packet.hasChild("block", Xmlns.BLOCKING) || packet.hasChild("blocklist", Xmlns.BLOCKING)) &&
packet.fromServer(account)) {
// Block list or block push.
Log.d(Config.LOGTAG, "Received blocklist update from server");
final Element blocklist = packet.findChild("blocklist", Xmlns.BLOCKING);
final Element block = packet.findChild("block", Xmlns.BLOCKING);
final Collection<Element> items = blocklist != null ? blocklist.getChildren() :
(block != null ? block.getChildren() : null);
// If this is a response to a blocklist query, clear the block list and replace with the new one.
// Otherwise, just update the existing blocklist.
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if (packet.getType() == IqPacket.TYPE.RESULT) {
account.clearBlocklist();
account.getXmppConnection().getFeatures().setBlockListRequested(true);
}
if (items != null) {
final Collection<Jid> jids = new ArrayList<>(items.size());
// Create a collection of Jids from the packet
for (final Element item : items) {
if (item.getName().equals("item")) {
final Jid jid = item.getAttributeAsJid("jid");
if (jid != null) {
jids.add(jid);
}
}
}
account.getBlocklist().addAll(jids);
}
// Update the UI
mXmppConnectionService.updateBlocklistUi(OnUpdateBlocklist.Status.BLOCKED);
} else if (packet.hasChild("unblock", Xmlns.BLOCKING) &&
packet.fromServer(account) && packet.getType() == IqPacket.TYPE.SET) {
Log.d(Config.LOGTAG, "Received unblock update from server");
final Collection<Element> items = packet.findChild("unblock", Xmlns.BLOCKING).getChildren();
if (items.size() == 0) {
// No children to unblock == unblock all
account.getBlocklist().clear();
} else {
final Collection<Jid> jids = new ArrayList<>(items.size());
for (final Element item : items) {
if (item.getName().equals("item")) {
final Jid jid = item.getAttributeAsJid("jid");
if (jid != null) {
jids.add(jid);
}
}
}
account.getBlocklist().removeAll(jids);
}
mXmppConnectionService.updateBlocklistUi(OnUpdateBlocklist.Status.UNBLOCKED);
} else if (packet.hasChild("open", "http://jabber.org/protocol/ibb")
|| packet.hasChild("data", "http://jabber.org/protocol/ibb")) {
mXmppConnectionService.getJingleConnectionManager()
.deliverIbbPacket(account, packet);
} else if (packet.hasChild("query", "http://jabber.org/protocol/disco#info")) {
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final IqPacket response = mXmppConnectionService.getIqGenerator().discoResponse(packet);
mXmppConnectionService.sendIqPacket(account, response, null);
} else if (packet.hasChild("query","jabber:iq:version")) {
final IqPacket response = mXmppConnectionService.getIqGenerator().versionResponse(packet);
mXmppConnectionService.sendIqPacket(account,response,null);
} else if (packet.hasChild("ping", "urn:xmpp:ping")) {
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final IqPacket response = packet.generateResponse(IqPacket.TYPE.RESULT);
mXmppConnectionService.sendIqPacket(account, response, null);
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} else {
if (packet.getType() == IqPacket.TYPE.GET || packet.getType() == IqPacket.TYPE.SET) {
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final IqPacket response = packet.generateResponse(IqPacket.TYPE.ERROR);
final Element error = response.addChild("error");
error.setAttribute("type", "cancel");
error.addChild("feature-not-implemented","urn:ietf:params:xml:ns:xmpp-stanzas");
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account.getXmppConnection().sendIqPacket(response, null);
}
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}
}
}