Multiple SSH connections not allowed in an sbt session - scala

Question

In a multi-module Scala project I'm running several integration tests where I use scala-ssh (v. 0.8) to connect to a remote machine via SSH and transfer a file from there.
If I run an integration test once in an sbt session, everything works as expected - I can connect to the machine and download any file. The related bits of Scala code are:
private lazy val fileInventory: AnsibleYamlFileInventory = {
val inventory = SSH(ansibleHost, HostResourceConfig()) { client =>
client.fileTransfer {
scp =>
val tmpLocalFile = Files.createTempFile("inventory", ".yaml")
scp.download(remoteYamlInventoryFile, tmpLocalFile.toAbsolutePath.toString)
new AnsibleYamlFileInventory(tmpLocalFile)
}
}
inventory.fold(s => throw new RuntimeException(s), identity)
}
The problem occurs if I try to run the same test (or another integration test) within the same sbt session. I get the same error message as mentioned here:
14:32:11.751 [reader] ERROR net.schmizz.sshj.transport.TransportImpl - Dying because - {}
net.schmizz.sshj.common.SSHRuntimeException: null
at net.schmizz.sshj.common.Buffer.readPublicKey(Buffer.java:432)
at net.schmizz.sshj.transport.kex.AbstractDHG.next(AbstractDHG.java:75)
at net.schmizz.sshj.transport.KeyExchanger.handle(KeyExchanger.java:367)
at net.schmizz.sshj.transport.TransportImpl.handle(TransportImpl.java:509)
at net.schmizz.sshj.transport.Decoder.decode(Decoder.java:107)
at net.schmizz.sshj.transport.Decoder.received(Decoder.java:175)
at net.schmizz.sshj.transport.Reader.run(Reader.java:60)
Caused by: java.security.GeneralSecurityException: java.security.spec.InvalidKeySpecException: key spec not recognised
at net.schmizz.sshj.common.KeyType$3.readPubKeyFromBuffer(KeyType.java:156)
at net.schmizz.sshj.common.Buffer.readPublicKey(Buffer.java:430)
... 6 common frames omitted
Caused by: java.security.spec.InvalidKeySpecException: key spec not recognised
at org.bouncycastle.jcajce.provider.asymmetric.util.BaseKeyFactorySpi.engineGeneratePublic(Unknown Source)
at org.bouncycastle.jcajce.provider.asymmetric.ec.KeyFactorySpi.engineGeneratePublic(Unknown Source)
at java.security.KeyFactory.generatePublic(KeyFactory.java:334)
at net.schmizz.sshj.common.KeyType$3.readPubKeyFromBuffer(KeyType.java:154)
... 7 common frames omitted
If I kill that sbt session and relaunch another one, I can again run only a single integration test before the problem reoccurs.
I have already installed the JCE 8 files as suggested. So, I'm wondering what I need to fix to get multiple tests running successfully where one after another they can ssh into that remote machine.

Answer 1

After some debugging I found out that the problem was due to BouncyCastle, which remains registered as a JCE provider in a follow-up test and causes problems. This shows up in the stack trace as:
INFO net.schmizz.sshj.common.SecurityUtils - BouncyCastle already registered as a JCE provider
I decided to add a security provider dynamically and remove it after tests are done.
def doTests(): Unit = {
import org.bouncycastle.jce.provider.BouncyCastleProvider
import java.security.Security
Security.addProvider(new BouncyCastleProvider)
"Some test" should {
"be BLABLA" in {
assert(...) // some test
}
}
"Some other test" should {
"be BLABLABLA" in {
assert(...) // some other test
}
}
Security.removeProvider(BouncyCastleProvider.PROVIDER_NAME)
}