SSHJ - Keypair login to EC2 instance

Question

I have a pem file that looks like the one in SSHJ tests (though I don\'t see it being referenced): https://github.com/shikhar/sshj/blob/master/src/test/resources/hostkey.pem

Answer 1

The example given for connecting to EC2 did not initially work for me until I added the BouncyCastleProvider to the java.security.Security class. The simple example that worked for me (written in Groovy for simplicity) is:

@Grab(group='net.schmizz', module='sshj', version='0.8.1')
@Grab(group='org.bouncycastle', module='bcprov-jdk16', version='1.46')

import net.schmizz.sshj.*
import net.schmizz.sshj.userauth.keyprovider.*
import net.schmizz.sshj.common.*
import net.schmizz.sshj.transport.verification.PromiscuousVerifier
import net.schmizz.sshj.connection.channel.direct.Session
import net.schmizz.sshj.connection.channel.direct.Session.Command

import java.security.*
import java.util.concurrent.TimeUnit

Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());

client = new SSHClient()
client.addHostKeyVerifier(new PromiscuousVerifier())
client.connect("ec2-XXX-XXX-XXX-XXX.compute-1.amazonaws.com")

PKCS8KeyFile keyFile = new PKCS8KeyFile()
keyFile.init(new File("/dev/ec2/key/mykey.pem"))
client.authPublickey("ubuntu",keyFile) 

final Session session = client.startSession()
final Command cmd = session.exec("whoami")
String response = IOUtils.readFully(cmd.getInputStream()).toString()
cmd.join(10, TimeUnit.SECONDS)

println response   //ubuntu

session.close()
client.disconnect()