/**
* Returns a newly created session between the server and a client. The session will be created
* and returned only if correct name/prefix (i.e. 'stream' or 'flash') and namespace were provided
* by the client.
*
* @param serverName the name of the server where the session is connecting to.
* @param xpp the parser that is reading the provided XML through the connection.
* @param connection the connection with the client.
* @return a newly created session between the server and a client.
* @throws org.xmlpull.v1.XmlPullParserException if an error occurs while parsing incoming data.
*/
public static LocalClientSession createSession(
String serverName, XmlPullParser xpp, Connection connection) throws XmlPullParserException {
boolean isFlashClient = xpp.getPrefix().equals("flash");
connection.setFlashClient(isFlashClient);
// Conduct error checking, the opening tag should be 'stream'
// in the 'etherx' namespace
if (!xpp.getName().equals("stream") && !isFlashClient) {
throw new XmlPullParserException(LocaleUtils.getLocalizedString("admin.error.bad-stream"));
}
if (!xpp.getNamespace(xpp.getPrefix()).equals(ETHERX_NAMESPACE)
&& !(isFlashClient && xpp.getNamespace(xpp.getPrefix()).equals(FLASH_NAMESPACE))) {
throw new XmlPullParserException(LocaleUtils.getLocalizedString("admin.error.bad-namespace"));
}
if (!allowedIPs.isEmpty()) {
String hostAddress = "Unknown";
// The server is using a whitelist so check that the IP address of the client
// is authorized to connect to the server
try {
hostAddress = connection.getHostAddress();
} catch (UnknownHostException e) {
// Do nothing
}
if (!isAllowed(connection)) {
// Client cannot connect from this IP address so end the stream and
// TCP connection
Log.debug(
"LocalClientSession: Closed connection to client attempting to connect from: "
+ hostAddress);
// Include the not-authorized error in the response
StreamError error = new StreamError(StreamError.Condition.not_authorized);
connection.deliverRawText(error.toXML());
// Close the underlying connection
connection.close();
return null;
}
}
// Default language is English ("en").
String language = "en";
// Default to a version of "0.0". Clients written before the XMPP 1.0 spec may
// not report a version in which case "0.0" should be assumed (per rfc3920
// section 4.4.1).
int majorVersion = 0;
int minorVersion = 0;
for (int i = 0; i < xpp.getAttributeCount(); i++) {
if ("lang".equals(xpp.getAttributeName(i))) {
language = xpp.getAttributeValue(i);
}
if ("version".equals(xpp.getAttributeName(i))) {
try {
int[] version = decodeVersion(xpp.getAttributeValue(i));
majorVersion = version[0];
minorVersion = version[1];
} catch (Exception e) {
Log.error(e.getMessage(), e);
}
}
}
// If the client supports a greater major version than the server,
// set the version to the highest one the server supports.
if (majorVersion > MAJOR_VERSION) {
majorVersion = MAJOR_VERSION;
minorVersion = MINOR_VERSION;
} else if (majorVersion == MAJOR_VERSION) {
// If the client supports a greater minor version than the
// server, set the version to the highest one that the server
// supports.
if (minorVersion > MINOR_VERSION) {
minorVersion = MINOR_VERSION;
}
}
// Store language and version information in the connection.
connection.setLanaguage(language);
connection.setXMPPVersion(majorVersion, minorVersion);
// Indicate the TLS policy to use for this connection
if (!connection.isSecure()) {
boolean hasCertificates = false;
try {
hasCertificates = SSLConfig.getKeyStore().size() > 0;
} catch (Exception e) {
Log.error(e.getMessage(), e);
}
Connection.TLSPolicy tlsPolicy = getTLSPolicy();
if (Connection.TLSPolicy.required == tlsPolicy && !hasCertificates) {
Log.error(
"Client session rejected. TLS is required but no certificates " + "were created.");
return null;
}
// Set default TLS policy
connection.setTlsPolicy(hasCertificates ? tlsPolicy : Connection.TLSPolicy.disabled);
} else {
// Set default TLS policy
connection.setTlsPolicy(Connection.TLSPolicy.disabled);
}
// Indicate the compression policy to use for this connection
connection.setCompressionPolicy(getCompressionPolicy());
// Create a ClientSession for this user.
LocalClientSession session = SessionManager.getInstance().createClientSession(connection);
// Build the start packet response
StringBuilder sb = new StringBuilder(200);
sb.append("<?xml version='1.0' encoding='");
sb.append(CHARSET);
sb.append("'?>");
if (isFlashClient) {
sb.append("<flash:stream xmlns:flash=\"http://www.jabber.com/streams/flash\" ");
} else {
sb.append("<stream:stream ");
}
sb.append("xmlns:stream=\"http://etherx.jabber.org/streams\" xmlns=\"jabber:client\" from=\"");
sb.append(serverName);
sb.append("\" id=\"");
sb.append(session.getStreamID().toString());
sb.append("\" xml:lang=\"");
sb.append(language);
// Don't include version info if the version is 0.0.
if (majorVersion != 0) {
sb.append("\" version=\"");
sb.append(majorVersion).append(".").append(minorVersion);
}
sb.append("\">");
connection.deliverRawText(sb.toString());
// If this is a "Jabber" connection, the session is now initialized and we can
// return to allow normal packet parsing.
if (majorVersion == 0) {
return session;
}
// Otherwise, this is at least XMPP 1.0 so we need to announce stream features.
sb = new StringBuilder(490);
sb.append("<stream:features>");
if (connection.getTlsPolicy() != Connection.TLSPolicy.disabled) {
sb.append("<starttls xmlns=\"urn:ietf:params:xml:ns:xmpp-tls\">");
if (connection.getTlsPolicy() == Connection.TLSPolicy.required) {
sb.append("<required/>");
}
sb.append("</starttls>");
}
// Include available SASL Mechanisms
sb.append(SASLAuthentication.getSASLMechanisms(session));
// Include Stream features
String specificFeatures = session.getAvailableStreamFeatures();
if (specificFeatures != null) {
sb.append(specificFeatures);
}
sb.append("</stream:features>");
connection.deliverRawText(sb.toString());
return session;
}
public void close() {
if (conn != null) {
conn.close();
}
}
