[slachiewicz]

Overview

This PR upgrades Apache SSHD from version 0.8.0 (released in 2012) to 2.13.2 (latest stable in the 2.x series) to address API incompatibilities and leverage modern, well-maintained SSH server implementation for testing.

Changes

Dependency Updates

Updated wagon-providers/wagon-ssh-common-test/pom.xml:

• sshd-core: 0.8.0 → 2.13.2
• Added sshd-scp: 2.13.2 (SCP support split into separate module)
• Added sshd-sftp: 2.13.2 (SFTP support split into separate module)

Code Migrations

SshServerEmbedded.java - Updated to use SSHD 2.x API:

• Replaced deprecated PEMGeneratorHostKeyProvider with SimpleGeneratorHostKeyProvider
• Switched to built-in ScpCommandFactory from org.apache.sshd.scp.server
• Simplified to use standard NativeFileSystemFactory instead of custom implementation
• Updated stop() method signature to throw IOException per SSHD 2.x API

TestPublickeyAuthenticator.java:

• Migrated from Apache Mina's org.apache.mina.util.Base64 to Java's built-in java.util.Base64
• Updated imports to match SSHD 2.x package structure (org.apache.sshd.server.auth.pubkey)

TestPasswordAuthenticator.java:

• Updated imports to match SSHD 2.x package structure (org.apache.sshd.server.auth.password)

ShellCommand.java:

• Updated Command interface implementation to accept ChannelSession parameter in start() and destroy() methods as required by SSHD 2.x

Removed Obsolete Code

Deleted custom implementations that are now provided by SSHD 2.x:

• ScpCommand.java (458 lines) - Replaced by SSHD 2.x built-in SCP implementation
• ScpCommandFactory.java (93 lines) - Replaced by org.apache.sshd.scp.server.ScpCommandFactory

Impact

This is a net reduction of 604 lines while upgrading to a modern, actively maintained version of Apache SSHD. The upgrade improves security, reliability, and maintainability of the SSH test infrastructure.