/**
* @param buffer The {@link Buffer}
* @param target A target path {@link String} or {@link Handle} or {@code byte[]} to be encoded in
* the buffer
* @return The updated buffer
* @throws UnsupportedOperationException If target is not one of the above supported types
*/
public Buffer putTarget(Buffer buffer, Object target) {
if (target instanceof CharSequence) {
buffer.putString(target.toString());
} else if (target instanceof byte[]) {
buffer.putBytes((byte[]) target);
} else if (target instanceof Handle) {
buffer.putBytes(((Handle) target).getIdentifier());
} else {
throw new UnsupportedOperationException("Unknown target type: " + target);
}
return buffer;
}
public synchronized void write(byte[] buf, int off, int len) {
if (len == 1) {
write(buf[off] & 0xFF);
} else {
buffer.putBytes(buf, off, len);
}
}
@Override
public Boolean doAuth(Buffer buffer, boolean init) throws Exception {
ValidateUtils.checkTrue(init, "Instance not initialized");
boolean hasSig = buffer.getBoolean();
String alg = buffer.getString();
int oldLim = buffer.wpos();
int oldPos = buffer.rpos();
int len = buffer.getInt();
buffer.wpos(buffer.rpos() + len);
PublicKey key = buffer.getRawPublicKey();
ServerFactoryManager manager = session.getFactoryManager();
Signature verif =
ValidateUtils.checkNotNull(
NamedFactory.Utils.create(manager.getSignatureFactories(), alg),
"No verifier located for algorithm=%s",
alg);
verif.initVerifier(key);
buffer.wpos(oldLim);
byte[] sig = hasSig ? buffer.getBytes() : null;
PublickeyAuthenticator authenticator =
ValidateUtils.checkNotNull(
manager.getPublickeyAuthenticator(), "No PublickeyAuthenticator configured");
if (!authenticator.authenticate(username, key, session)) {
return Boolean.FALSE;
}
if (!hasSig) {
Buffer buf = session.createBuffer(SshConstants.SSH_MSG_USERAUTH_PK_OK);
buf.putString(alg);
buf.putRawBytes(buffer.array(), oldPos, 4 + len);
session.writePacket(buf);
return null;
} else {
Buffer buf = new ByteArrayBuffer();
buf.putBytes(session.getKex().getH());
buf.putByte(SshConstants.SSH_MSG_USERAUTH_REQUEST);
buf.putString(username);
buf.putString(service);
buf.putString(UserAuthPublicKeyFactory.NAME);
buf.putBoolean(true);
buf.putString(alg);
buffer.rpos(oldPos);
buffer.wpos(oldPos + 4 + len);
buf.putBuffer(buffer);
verif.update(buf.array(), buf.rpos(), buf.available());
if (!verif.verify(sig)) {
throw new Exception("Key verification failed");
}
return Boolean.TRUE;
}
}