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/**
* $Id: RadiusServer.java,v 1.11 2008/04/24 05:22:50 wuttke Exp $
* Created on 09.04.2005
* @author Matthias Wuttke
* @version $Revision: 1.11 $
*/
package org.tinyradius.util;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.SocketException;
import java.net.SocketTimeoutException;
import java.util.Arrays;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.tinyradius.attribute.RadiusAttribute;
import org.tinyradius.packet.AccessRequest;
import org.tinyradius.packet.AccountingRequest;
import org.tinyradius.packet.RadiusPacket;
/**
* Implements a simple Radius server. This class must be subclassed to
* provide an implementation for getSharedSecret() and getUserPassword().
* If the server supports accounting, it must override
* accountingRequestReceived().
*/
public abstract class RadiusServer {
/**
* Returns the shared secret used to communicate with the client with the
* passed IP address or null if the client is not allowed at this server.
* @param client IP address and port number of client
* @return shared secret or null
*/
public abstract String getSharedSecret(InetSocketAddress client);
/**
* Returns the password of the passed user. Either this
* method or accessRequestReceived() should be overriden.
* @param userName user name
* @return plain-text password or null if user unknown
*/
public abstract String getUserPassword(String userName);
/**
* Constructs an answer for an Access-Request packet. Either this
* method or isUserAuthenticated should be overriden.
* @param accessRequest Radius request packet
* @param client address of Radius client
* @return response packet or null if no packet shall be sent
* @exception RadiusException malformed request packet; if this
* exception is thrown, no answer will be sent
*/
public RadiusPacket accessRequestReceived(AccessRequest accessRequest, InetSocketAddress client)
throws RadiusException {
String plaintext = getUserPassword(accessRequest.getUserName());
int type = RadiusPacket.ACCESS_REJECT;
if (plaintext != null && accessRequest.verifyPassword(plaintext))
type = RadiusPacket.ACCESS_ACCEPT;
RadiusPacket answer = new RadiusPacket(type, accessRequest.getPacketIdentifier());
copyProxyState(accessRequest, answer);
return answer;
}
/**
* Constructs an answer for an Accounting-Request packet. This method
* should be overriden if accounting is supported.
* @param accountingRequest Radius request packet
* @param client address of Radius client
* @return response packet or null if no packet shall be sent
* @exception RadiusException malformed request packet; if this
* exception is thrown, no answer will be sent
*/
public RadiusPacket accountingRequestReceived(AccountingRequest accountingRequest, InetSocketAddress client)
throws RadiusException {
RadiusPacket answer = new RadiusPacket(RadiusPacket.ACCOUNTING_RESPONSE, accountingRequest.getPacketIdentifier());
copyProxyState(accountingRequest, answer);
return answer;
}
/**
* Starts the Radius server.
* @param listenAuth open auth port?
* @param listenAcct open acct port?
*/
public void start(boolean listenAuth, boolean listenAcct) {
if (listenAuth) {
new Thread() {
public void run() {
setName("Radius Auth Listener");
try {
logger.info("starting RadiusAuthListener on port " + getAuthPort());
listenAuth();
logger.info("RadiusAuthListener is being terminated");
} catch(Exception e) {
e.printStackTrace();
logger.fatal("auth thread stopped by exception", e);
} finally {
authSocket.close();
logger.debug("auth socket closed");
}
}
}.start();
}
if (listenAcct) {
new Thread() {
public void run() {
setName("Radius Acct Listener");
try {
logger.info("starting RadiusAcctListener on port " + getAcctPort());
listenAcct();
logger.info("RadiusAcctListener is being terminated");
} catch(Exception e) {
e.printStackTrace();
logger.fatal("acct thread stopped by exception", e);
} finally {
acctSocket.close();
logger.debug("acct socket closed");
}
}
}.start();
}
}
/**
* Stops the server and closes the sockets.
*/
public void stop() {
logger.info("stopping Radius server");
closing = true;
if (authSocket != null)
authSocket.close();
if (acctSocket != null)
acctSocket.close();
}
/**
* Returns the auth port the server will listen on.
* @return auth port
*/
public int getAuthPort() {
return authPort;
}
/**
* Sets the auth port the server will listen on.
* @param authPort auth port, 1-65535
*/
public void setAuthPort(int authPort) {
if (authPort < 1 || authPort > 65535)
throw new IllegalArgumentException("bad port number");
this.authPort = authPort;
this.authSocket = null;
}
/**
* Returns the socket timeout (ms).
* @return socket timeout
*/
public int getSocketTimeout() {
return socketTimeout;
}
/**
* Sets the socket timeout.
* @param socketTimeout socket timeout, >0 ms
* @throws SocketException
*/
public void setSocketTimeout(int socketTimeout)
throws SocketException {
if (socketTimeout < 1)
throw new IllegalArgumentException("socket tiemout must be positive");
this.socketTimeout = socketTimeout;
if (authSocket != null)
authSocket.setSoTimeout(socketTimeout);
if (acctSocket != null)
acctSocket.setSoTimeout(socketTimeout);
}
/**
* Sets the acct port the server will listen on.
* @param acctPort acct port 1-65535
*/
public void setAcctPort(int acctPort) {
if (acctPort < 1 || acctPort > 65535)
throw new IllegalArgumentException("bad port number");
this.acctPort = acctPort;
this.acctSocket = null;
}
/**
* Returns the acct port the server will listen on.
* @return acct port
*/
public int getAcctPort() {
return acctPort;
}
/**
* Returns the duplicate interval in ms.
* A packet is discarded as a duplicate if in the duplicate interval
* there was another packet with the same identifier originating from the
* same address.
* @return duplicate interval (ms)
*/
public long getDuplicateInterval() {
return duplicateInterval;
}
/**
* Sets the duplicate interval in ms.
* A packet is discarded as a duplicate if in the duplicate interval
* there was another packet with the same identifier originating from the
* same address.
* @param duplicateInterval duplicate interval (ms), >0
*/
public void setDuplicateInterval(long duplicateInterval) {
if (duplicateInterval <= 0)
throw new IllegalArgumentException("duplicate interval must be positive");
this.duplicateInterval = duplicateInterval;
}
/**
* Returns the IP address the server listens on.
* Returns null if listening on the wildcard address.
* @return listen address or null
*/
public InetAddress getListenAddress() {
return listenAddress;
}
/**
* Sets the address the server listens on.
* Must be called before start().
* Defaults to null, meaning listen on every
* local address (wildcard address).
* @param listenAddress listen address or null
*/
public void setListenAddress(InetAddress listenAddress) {
this.listenAddress = listenAddress;
}
/**
* Copies all Proxy-State attributes from the request
* packet to the response packet.
* @param request request packet
* @param answer response packet
*/
protected void copyProxyState(RadiusPacket request, RadiusPacket answer) {
List proxyStateAttrs = request.getAttributes(33);
for (Iterator i = proxyStateAttrs.iterator(); i.hasNext();) {
RadiusAttribute proxyStateAttr = (RadiusAttribute)i.next();
answer.addAttribute(proxyStateAttr);
}
}
/**
* Listens on the auth port (blocks the current thread).
* Returns when stop() is called.
* @throws SocketException
* @throws InterruptedException
*
*/
protected void listenAuth()
throws SocketException {
listen(getAuthSocket());
}
/**
* Listens on the acct port (blocks the current thread).
* Returns when stop() is called.
* @throws SocketException
* @throws InterruptedException
*/
protected void listenAcct()
throws SocketException {
listen(getAcctSocket());
}
/**
* Listens on the passed socket, blocks until stop() is called.
* @param s socket to listen on
*/
protected void listen(DatagramSocket s) {
DatagramPacket packetIn = new DatagramPacket(new byte[RadiusPacket.MAX_PACKET_LENGTH], RadiusPacket.MAX_PACKET_LENGTH);
while (true) {
try {
// receive packet
try {
logger.trace("about to call socket.receive()");
s.receive(packetIn);
if (logger.isDebugEnabled())
logger.debug("receive buffer size = " + s.getReceiveBufferSize());
} catch (SocketException se) {
if (closing) {
// end thread
logger.info("got closing signal - end listen thread");
return;
} else {
// retry s.receive()
logger.error("SocketException during s.receive() -> retry", se);
continue;
}
}
// check client
InetSocketAddress localAddress = (InetSocketAddress)s.getLocalSocketAddress();
InetSocketAddress remoteAddress = new InetSocketAddress(packetIn.getAddress(), packetIn.getPort());
String secret = getSharedSecret(remoteAddress);
if (secret == null) {
if (logger.isInfoEnabled())
logger.info("ignoring packet from unknown client " + remoteAddress + " received on local address " + localAddress);
continue;
}
// parse packet
RadiusPacket request = makeRadiusPacket(packetIn, secret);
if (logger.isInfoEnabled())
logger.info("received packet from " + remoteAddress + " on local address " + localAddress + ": " + request);
// handle packet
logger.trace("about to call RadiusServer.handlePacket()");
RadiusPacket response = handlePacket(localAddress, remoteAddress, request, secret);
// send response
if (response != null) {
if (logger.isInfoEnabled())
logger.info("send response: " + response);
DatagramPacket packetOut = makeDatagramPacket(response, secret, remoteAddress.getAddress(), packetIn.getPort(), request);
s.send(packetOut);
} else
logger.info("no response sent");
} catch (SocketTimeoutException ste) {
// this is expected behaviour
logger.trace("normal socket timeout");
} catch (IOException ioe) {
// error while reading/writing socket
logger.error("communication error", ioe);
} catch (RadiusException re) {
// malformed packet
logger.error("malformed Radius packet", re);
}
}
}
/**
* Handles the received Radius packet and constructs a response.
* @param localAddress local address the packet was received on
* @param remoteAddress remote address the packet was sent by
* @param request the packet
* @return response packet or null for no response
* @throws RadiusException
*/
protected RadiusPacket handlePacket(InetSocketAddress localAddress, InetSocketAddress remoteAddress, RadiusPacket request, String sharedSecret)
throws RadiusException, IOException {
RadiusPacket response = null;
// check for duplicates
if (!isPacketDuplicate(request, remoteAddress)) {
if (localAddress.getPort() == getAuthPort()) {
// handle packets on auth port
if (request instanceof AccessRequest)
response = accessRequestReceived((AccessRequest)request, remoteAddress);
else
logger.error("unknown Radius packet type: " + request.getPacketType());
} else if (localAddress.getPort() == getAcctPort()) {
// handle packets on acct port
if (request instanceof AccountingRequest)
response = accountingRequestReceived((AccountingRequest)request, remoteAddress);
else
logger.error("unknown Radius packet type: " + request.getPacketType());
} else {
// ignore packet on unknown port
}
} else
logger.info("ignore duplicate packet");
return response;
}
/**
* Returns a socket bound to the auth port.
* @return socket
* @throws SocketException
*/
protected DatagramSocket getAuthSocket()
throws SocketException {
if (authSocket == null) {
if (getListenAddress() == null)
authSocket = new DatagramSocket(getAuthPort());
else
authSocket = new DatagramSocket(getAuthPort(), getListenAddress());
authSocket.setSoTimeout(getSocketTimeout());
}
return authSocket;
}
/**
* Returns a socket bound to the acct port.
* @return socket
* @throws SocketException
*/
protected DatagramSocket getAcctSocket()
throws SocketException {
if (acctSocket == null) {
if (getListenAddress() == null)
acctSocket = new DatagramSocket(getAcctPort());
else
acctSocket = new DatagramSocket(getAcctPort(), getListenAddress());
acctSocket.setSoTimeout(getSocketTimeout());
}
return acctSocket;
}
/**
* Creates a Radius response datagram packet from a RadiusPacket to be send.
* @param packet RadiusPacket
* @param secret shared secret to encode packet
* @param address where to send the packet
* @param port destination port
* @param request request packet
* @return new datagram packet
* @throws IOException
*/
protected DatagramPacket makeDatagramPacket(RadiusPacket packet, String secret, InetAddress address, int port,
RadiusPacket request)
throws IOException {
ByteArrayOutputStream bos = new ByteArrayOutputStream();
packet.encodeResponsePacket(bos, secret, request);
byte[] data = bos.toByteArray();
DatagramPacket datagram = new DatagramPacket(data, data.length, address, port);
return datagram;
}
/**
* Creates a RadiusPacket for a Radius request from a received
* datagram packet.
* @param packet received datagram
* @return RadiusPacket object
* @exception RadiusException malformed packet
* @exception IOException communication error (after getRetryCount()
* retries)
*/
protected RadiusPacket makeRadiusPacket(DatagramPacket packet, String sharedSecret)
throws IOException, RadiusException {
ByteArrayInputStream in = new ByteArrayInputStream(packet.getData());
return RadiusPacket.decodeRequestPacket(in, sharedSecret);
}
/**
* Checks whether the passed packet is a duplicate.
* A packet is duplicate if another packet with the same identifier
* has been sent from the same host in the last time.
* @param packet packet in question
* @param address client address
* @return true if it is duplicate
*/
protected boolean isPacketDuplicate(RadiusPacket packet, InetSocketAddress address) {
long now = System.currentTimeMillis();
long intervalStart = now - getDuplicateInterval();
byte[] authenticator = packet.getAuthenticator();
synchronized(receivedPackets) {
for (Iterator i = receivedPackets.iterator(); i.hasNext();) {
ReceivedPacket p = (ReceivedPacket)i.next();
if (p.receiveTime < intervalStart) {
// packet is older than duplicate interval
i.remove();
} else {
if (p.address.equals(address) && p.packetIdentifier == packet.getPacketIdentifier()) {
if (authenticator != null && p.authenticator != null) {
// packet is duplicate if stored authenticator is equal
// to the packet authenticator
return Arrays.equals(p.authenticator, authenticator);
} else {
// should not happen, packet is duplicate
return true;
}
}
}
}
// add packet to receive list
ReceivedPacket rp = new ReceivedPacket();
rp.address = address;
rp.packetIdentifier = packet.getPacketIdentifier();
rp.receiveTime = now;
rp.authenticator = authenticator;
receivedPackets.add(rp);
}
return false;
}
private InetAddress listenAddress = null;
private int authPort = 1812;
private int acctPort = 1813;
private DatagramSocket authSocket = null;
private DatagramSocket acctSocket = null;
private int socketTimeout = 3000;
private List receivedPackets = new LinkedList();
private long duplicateInterval = 30000; // 30 s
private boolean closing = false;
private static Log logger = LogFactory.getLog(RadiusServer.class);
}
/**
* This internal class represents a packet that has been received by
* the server.
*/
class ReceivedPacket {
/**
* The identifier of the packet.
*/
public int packetIdentifier;
/**
* The time the packet was received.
*/
public long receiveTime;
/**
* The address of the host who sent the packet.
*/
public InetSocketAddress address;
/**
* Authenticator of the received packet.
*/
public byte[] authenticator;
}
