public Channel launchChannel(String[] cmd, OutputStream err, FilePath _workDir, Map<String,String> envOverrides) throws IOException, InterruptedException {
printCommandLine(cmd, _workDir);
Pipe out = Pipe.createRemoteToLocal();
final String workDir = _workDir==null ? null : _workDir.getRemote();
OutputStream os = getChannel().call(new RemoteChannelLaunchCallable(cmd, out, err, workDir, envOverrides));
return new Channel("remotely launched channel on "+channel,
Computer.threadPoolForRemoting, out.getIn(), new BufferedOutputStream(os));
}
/**
* Authenticate ourselves against the server.
*
* @return identity of the server represented as a public key.
*/
public PublicKey authenticate(Iterable<KeyPair> privateKeys)
throws IOException, GeneralSecurityException {
Pipe c2s = Pipe.createLocalToRemote();
Pipe s2c = Pipe.createRemoteToLocal();
entryPoint.authenticate("ssh", c2s, s2c);
Connection c = new Connection(s2c.getIn(), c2s.getOut());
try {
byte[] sharedSecret = c.diffieHellman(false).generateSecret();
PublicKey serverIdentity = c.verifyIdentity(sharedSecret);
// try all the public keys
for (KeyPair key : privateKeys) {
c.proveIdentity(sharedSecret, key);
if (c.readBoolean()) return serverIdentity; // succeeded
}
if (privateKeys.iterator().hasNext())
throw new GeneralSecurityException("Authentication failed. No private key accepted.");
else
throw new GeneralSecurityException("No private key is available for use in authentication");
} finally {
c.close();
}
}