Ssh pipeline seem not compatible with OPENSSH 8.8
Issue description and hints
Trying to implement this Jenkins plugin, to connect to my local VM from Jenkins (installed through docker / DIND)
The local VM is running under Fedora 36 Linux, and here is the ssh / ssl versions there :
ssh -v localhost OpenSSH_8.8p1, OpenSSL 3.0.5 5 Jul 2022
It systematically returns an exception like this one :
Started by user Replayed #9 [Pipeline] Start of Pipeline [Pipeline] node Running on Jenkins in /var/jenkins_home/workspace/ssh smoke test [Pipeline] { [Pipeline] withCredentials Masking supported pattern matches of $identity [Pipeline] { [Pipeline] echo using userroot [Pipeline] stage [Pipeline] { (SSH Steps Rocks!) [Pipeline] writeFile [Pipeline] sshCommand Executing command on localhost[10.0.2.15]: for i in {1..5}; do echo -n "Loop $i "; date ; sleep 1; done sudo: false [Pipeline] } [Pipeline] // stage [Pipeline] } [Pipeline] // withCredentials [Pipeline] } [Pipeline] // node [Pipeline] End of Pipeline com.jcraft.jsch.JSchException: Auth fail at com.jcraft.jsch.Session.connect(Session.java:519) at com.jcraft.jsch.Session.connect(Session.java:183) at com.jcraft.jsch.Session$connect$1.call(Unknown Source) at org.hidetake.groovy.ssh.connection.ConnectionManager.connectInternal(ConnectionManager.groovy:107) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.base/java.lang.reflect.Method.invoke(Unknown Source) at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:98) at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:325)
The SSHD server logs this error in output :
oct. 31 16:23:31 fedora sshd[35506]: userauth_pubkey: key type ssh-rsa not in PubkeyAcceptedAlgorithms [preauth] oct. 31 16:23:31 fedora sshd[35506]: error: Received disconnect from 172.18.0.2 port 35440:3: com.jcraft.jsch.JSchException: Auth fail [preauth]
more info on this topic:
As explained in the https://www.openssh.com/txt/release-8.8 note, the PubkeyAcceptedAlgorithms ssh-rsa is now deprecated, and it matchs with the error log above.
I also found a ticket issue https://github.com/int128/groovy-ssh/issues/292 which explains that the Jenkins plugins relies on groovy-ssh solution, which in turn relies on https://sourceforge.net/projects/jsch/ which is not maintained, and propose the developpers to use an alternative solution that has been developped to comply with OpenSSH 8.8
By the way https://github.com/int128/groovy-ssh has not commit since march 2019, so I am afraid that is it not maintained neither
There are some more details about this Open SSH SHA 1 RSA scheme deprecation here.
Proposed workaround
It is possible to run ssh commands directly, the drawback being that it is required to specify explicitly the command to run :
def remote = [:] remote.name = "localhost" remote.host = "10.0.2.15" remote.allowAnyHosts = true node { withCredentials([sshUserPrivateKey(credentialsId: 'sshUser', keyFileVariable: 'identity', passphraseVariable: '', usernameVariable: 'userName')]) { remote.user = userName remote.identityFile = identity stage("Scan with InSpec") { sh (''' HOST_IP="10.0.2.15" ssh -i ${identity} ${userName}@${HOST_IP} 'inspec exec /home/laurent/lfs262_formation/linux-baseline' ''') } } }
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