package ch.ethz.ssh2.auth;
import java.io.IOException;
import java.security.SecureRandom;
import java.util.Vector;
import ch.ethz.ssh2.InteractiveCallback;
import ch.ethz.ssh2.crypto.PEMDecoder;
import ch.ethz.ssh2.packets.PacketServiceAccept;
import ch.ethz.ssh2.packets.PacketServiceRequest;
import ch.ethz.ssh2.packets.PacketUserauthBanner;
import ch.ethz.ssh2.packets.PacketUserauthFailure;
import ch.ethz.ssh2.packets.PacketUserauthInfoRequest;
import ch.ethz.ssh2.packets.PacketUserauthInfoResponse;
import ch.ethz.ssh2.packets.PacketUserauthRequestInteractive;
import ch.ethz.ssh2.packets.PacketUserauthRequestNone;
import ch.ethz.ssh2.packets.PacketUserauthRequestPassword;
import ch.ethz.ssh2.packets.PacketUserauthRequestPublicKey;
import ch.ethz.ssh2.packets.Packets;
import ch.ethz.ssh2.packets.TypesWriter;
import ch.ethz.ssh2.signature.DSAPrivateKey;
import ch.ethz.ssh2.signature.DSASHA1Verify;
import ch.ethz.ssh2.signature.DSASignature;
import ch.ethz.ssh2.signature.RSAPrivateKey;
import ch.ethz.ssh2.signature.RSASHA1Verify;
import ch.ethz.ssh2.signature.RSASignature;
import ch.ethz.ssh2.transport.MessageHandler;
import ch.ethz.ssh2.transport.TransportManager;
/**
* AuthenticationManager.
*
* @author Christian Plattner, plattner@inf.ethz.ch
* @version $Id: AuthenticationManager.java,v 1.14 2006/07/30 21:59:29 cplattne Exp $
*/
public class AuthenticationManager implements MessageHandler
{
TransportManager tm;
Vector packets = new Vector();
boolean connectionClosed = false;
String banner;
String[] remainingMethods = null;
boolean isPartialSuccess = false;
boolean authenticated = false;
boolean initDone = false;
public AuthenticationManager(TransportManager tm)
{
this.tm = tm;
}
boolean methodPossible(String methName)
{
if (remainingMethods == null)
return false;
for (int i = 0; i < remainingMethods.length; i++)
{
if (remainingMethods[i].compareTo(methName) == 0)
return true;
}
return false;
}
byte[] deQueue() throws IOException
{
synchronized (packets)
{
while (packets.size() == 0)
{
if (connectionClosed)
throw (IOException) new IOException("The connection is closed.").initCause(tm
.getReasonClosedCause());
try
{
packets.wait();
}
catch (InterruptedException ign)
{
}
}
/* This sequence works with J2ME */
byte[] res = (byte[]) packets.firstElement();
packets.removeElementAt(0);
return res;
}
}
byte[] getNextMessage() throws IOException
{
while (true)
{
byte[] msg = deQueue();
if (msg[0] != Packets.SSH_MSG_USERAUTH_BANNER)
return msg;
PacketUserauthBanner sb = new PacketUserauthBanner(msg, 0, msg.length);
banner = sb.getBanner();
}
}
public String[] getRemainingMethods(String user) throws IOException
{
initialize(user);
return remainingMethods;
}
public boolean getPartialSuccess()
{
return isPartialSuccess;
}
private boolean initialize(String user) throws IOException
{
if (initDone == false)
{
tm.registerMessageHandler(this, 0, 255);
PacketServiceRequest sr = new PacketServiceRequest("ssh-userauth");
tm.sendMessage(sr.getPayload());
PacketUserauthRequestNone urn = new PacketUserauthRequestNone("ssh-connection", user);
tm.sendMessage(urn.getPayload());
byte[] msg = getNextMessage();
new PacketServiceAccept(msg, 0, msg.length);
msg = getNextMessage();
initDone = true;
if (msg[0] == Packets.SSH_MSG_USERAUTH_SUCCESS)
{
authenticated = true;
return true;
}
if (msg[0] == Packets.SSH_MSG_USERAUTH_FAILURE)
{
PacketUserauthFailure puf = new PacketUserauthFailure(msg, 0, msg.length);
remainingMethods = puf.getAuthThatCanContinue();
isPartialSuccess = puf.isPartialSuccess();
return false;
}
throw new IOException("Unexpected SSH message (type " + msg[0] + ")");
}
return authenticated;
}
public boolean authenticatePublicKey(String user, char[] PEMPrivateKey, String password, SecureRandom rnd) throws IOException
{
try
{
initialize(user);
if (methodPossible("publickey") == false)
throw new IOException("Authentication method publickey not supported by the server at this stage.");
Object key = PEMDecoder.decode(PEMPrivateKey, password);
if (key instanceof DSAPrivateKey)
{
DSAPrivateKey pk = (DSAPrivateKey) key;
byte[] pk_enc = DSASHA1Verify.encodeSSHDSAPublicKey(pk.getPublicKey());
TypesWriter tw = new TypesWriter();
byte[] H = tm.getSessionIdentifier();
tw.writeString(H, 0, H.length);
tw.writeByte(Packets.SSH_MSG_USERAUTH_REQUEST);
tw.writeString(user);
tw.writeString("ssh-connection");
tw.writeString("publickey");
tw.writeBoolean(true);
tw.writeString("ssh-dss");
tw.writeString(pk_enc, 0, pk_enc.length);
byte[] msg = tw.getBytes();
DSASignature ds = DSASHA1Verify.generateSignature(msg, pk, rnd);
byte[] ds_enc = DSASHA1Verify.encodeSSHDSASignature(ds);
PacketUserauthRequestPublicKey ua = new PacketUserauthRequestPublicKey("ssh-connection", user,
"ssh-dss", pk_enc, ds_enc);
tm.sendMessage(ua.getPayload());
}
else if (key instanceof RSAPrivateKey)
{
RSAPrivateKey pk = (RSAPrivateKey) key;
byte[] pk_enc = RSASHA1Verify.encodeSSHRSAPublicKey(pk.getPublicKey());
TypesWriter tw = new TypesWriter();
{
byte[] H = tm.getSessionIdentifier();
tw.writeString(H, 0, H.length);
tw.writeByte(Packets.SSH_MSG_USERAUTH_REQUEST);
tw.writeString(user);
tw.writeString("ssh-connection");
tw.writeString("publickey");
tw.writeBoolean(true);
tw.writeString("ssh-rsa");
tw.writeString(pk_enc, 0, pk_enc.length);
}
byte[] msg = tw.getBytes();
RSASignature ds = RSASHA1Verify.generateSignature(msg, pk);
byte[] rsa_sig_enc = RSASHA1Verify.encodeSSHRSASignature(ds);
PacketUserauthRequestPublicKey ua = new PacketUserauthRequestPublicKey("ssh-connection", user,
"ssh-rsa", pk_enc, rsa_sig_enc);
tm.sendMessage(ua.getPayload());
}
else
{
throw new IOException("Unknown private key type returned by the PEM decoder.");
}
byte[] ar = getNextMessage();
if (ar[0] == Packets.SSH_MSG_USERAUTH_SUCCESS)
{
authenticated = true;
tm.removeMessageHandler(this, 0, 255);
return true;
}
if (ar[0] == Packets.SSH_MSG_USERAUTH_FAILURE)
{
PacketUserauthFailure puf = new PacketUserauthFailure(ar, 0, ar.length);
remainingMethods = puf.getAuthThatCanContinue();
isPartialSuccess = puf.isPartialSuccess();
return false;
}
throw new IOException("Unexpected SSH message (type " + ar[0] + ")");
}
catch (IOException e)
{
tm.close(e, false);
throw (IOException) new IOException("Publickey authentication failed.").initCause(e);
}
}
public boolean authenticatePassword(String user, String pass) throws IOException
{
try
{
initialize(user);
if (methodPossible("password") == false)
throw new IOException("Authentication method password not supported by the server at this stage.");
PacketUserauthRequestPassword ua = new PacketUserauthRequestPassword("ssh-connection", user, pass);
tm.sendMessage(ua.getPayload());
byte[] ar = getNextMessage();
if (ar[0] == Packets.SSH_MSG_USERAUTH_SUCCESS)
{
authenticated = true;
tm.removeMessageHandler(this, 0, 255);
return true;
}
if (ar[0] == Packets.SSH_MSG_USERAUTH_FAILURE)
{
PacketUserauthFailure puf = new PacketUserauthFailure(ar, 0, ar.length);
remainingMethods = puf.getAuthThatCanContinue();
isPartialSuccess = puf.isPartialSuccess();
return false;
}
throw new IOException("Unexpected SSH message (type " + ar[0] + ")");
}
catch (IOException e)
{
tm.close(e, false);
throw (IOException) new IOException("Password authentication failed.").initCause(e);
}
}
public boolean authenticateInteractive(String user, String[] submethods, InteractiveCallback cb) throws IOException
{
try
{
initialize(user);
if (methodPossible("keyboard-interactive") == false)
throw new IOException(
"Authentication method keyboard-interactive not supported by the server at this stage.");
if (submethods == null)
submethods = new String[0];
PacketUserauthRequestInteractive ua = new PacketUserauthRequestInteractive("ssh-connection", user,
submethods);
tm.sendMessage(ua.getPayload());
while (true)
{
byte[] ar = getNextMessage();
if (ar[0] == Packets.SSH_MSG_USERAUTH_SUCCESS)
{
authenticated = true;
tm.removeMessageHandler(this, 0, 255);
return true;
}
if (ar[0] == Packets.SSH_MSG_USERAUTH_FAILURE)
{
PacketUserauthFailure puf = new PacketUserauthFailure(ar, 0, ar.length);
remainingMethods = puf.getAuthThatCanContinue();
isPartialSuccess = puf.isPartialSuccess();
return false;
}
if (ar[0] == Packets.SSH_MSG_USERAUTH_INFO_REQUEST)
{
PacketUserauthInfoRequest pui = new PacketUserauthInfoRequest(ar, 0, ar.length);
String[] responses;
try
{
responses = cb.replyToChallenge(pui.getName(), pui.getInstruction(), pui.getNumPrompts(), pui
.getPrompt(), pui.getEcho());
}
catch (Exception e)
{
throw (IOException) new IOException("Exception in callback.").initCause(e);
}
if (responses == null)
throw new IOException("Your callback may not return NULL!");
PacketUserauthInfoResponse puir = new PacketUserauthInfoResponse(responses);
tm.sendMessage(puir.getPayload());
continue;
}
throw new IOException("Unexpected SSH message (type " + ar[0] + ")");
}
}
catch (IOException e)
{
tm.close(e, false);
throw (IOException) new IOException("Keyboard-interactive authentication failed.").initCause(e);
}
}
public void handleMessage(byte[] msg, int msglen) throws IOException
{
synchronized (packets)
{
if (msg == null)
{
connectionClosed = true;
}
else
{
byte[] tmp = new byte[msglen];
System.arraycopy(msg, 0, tmp, 0, msglen);
packets.addElement(tmp);
}
packets.notifyAll();
if (packets.size() > 5)
{
connectionClosed = true;
throw new IOException("Error, peer is flooding us with authentication packets.");
}
}
}
}