Description:

The most recent update of the SSH Steps Plugin has led to an algorithm negotiation failure during build executions. This failure is due to a newly introduced dependency on JSch, which no longer supports the SSH-RSA algorithm. The workaround solutions provided in the JSch documentation (found here: https://github.com/mwiede/jsch#fork-of-jsch-0155) to manually re-enable SSH-RSA do not resolve the issue. Our builds are dependent on SSH-RSA as the devices on which they are executed only support this algorithm.

Steps to Reproduce:

1. Update the SSH Steps Plugin to the latest version.
2. Execute a build that requires an SSH connection to a device that only supports SSH-RSA.
3. Observe the error in the build log indicating an algorithm negotiation failure.

Expected Results:

The build should establish a successful SSH connection using the SSH-RSA algorithm.

Actual Results:

The build fails with a com.jcraft.jsch.JSchAlgoNegoFailException, indicating a failure to negotiate the algorithm for server_host_key, with JSch proposing several algorithms but not matching with the server's proposal of "ssh-rsa".

Error Log:

19:03:15 com.jcraft.jsch.JSchAlgoNegoFailException: Algorithm negotiation fail: algorithmName="server_host_key" jschProposal="ssh-ed25519,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,rsa-sha2-512,rsa-sha2-256" serverProposal="ssh-rsa" 

<dependency>
  <groupId>org.jenkins-ci.plugins</groupId>
  <artifactId>jsch</artifactId>
</dependency> 

Related Links:

• JSch Fork Documentation: https://github.com/mwiede/jsch#fork-of-jsch-0155
• SSH Steps Plugin Changelog: https://github.com/jenkinsci/ssh-steps-plugin/compare/2.0.65.vd26b_5b_9b_de4d...2.0.68.va_d21a_12a_6476