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Apache MINA SSHD

Apache MINA SSHD

Apache MINA SSHD is a 100% pure java library to support the SSH protocols on both the client and server side. It does not aim at being a replacement for the SSH client or SSH server from Unix operating systems, but rather provides support for Java based applications requiring SSH support.

The library can leverage several I/O back-ends:

  • The default transport is built-in and uses Java's AsynchronousSocketChannels.
  • Apache MINA, a scalable and high performance asynchronous I/O library, can be used instead, or
  • the Netty asynchronous event-driven network framework is also supported.

Supported standards

Release notes

Issue reporting

Bug reports and improvement or feature requests can be filed at the GitHub issue tracker or at the Apache issue tracker.

Sensitive issues such as security vulnerabilities must be reported through private channels, not via either issue tracker.

Core requirements

  • Java 8+ (as of version 1.3)

  • Slf4j

The code only requires the core abstract slf4j-api module. The actual implementation of the logging API can be selected from the many existing adaptors.

Basic artifacts structure

  • sshd-common - contains basic classes used throughout the project as well as code that does not require client or server network support.

  • sshd-core - contains the basic SSH client/server code implementing the connection, transport, channels, forwarding, etc..

    • sshd-mina, sshd-netty - replacements for the default NIO2 connector used to establish and manage network connections using MINA and/or Netty libraries respectively.

  • sshd-sftp - contains the server side SFTP subsystem and the SFTP client code.

  • sshd-scp - contains the server side SCP command handler and the SCP client code.

  • sshd-ldap - contains server-side password and public key authenticators that use an LDAP server.

  • sshd-git - contains replacements for JGit SSH session factory.

  • sshd-osgi - contains an artifact that combines sshd-common and sshd-core so it can be deployed in OSGi environments.

  • sshd-putty - contains code that can parse PUTTY key files.

  • sshd-openpgp - contains code that can parse OpenPGP key files (with some limitations - see relevant section)

  • sshd-cli - contains simple templates for command-line client/server - used to provide look-and-feel similar to the Linux ssh/sshd commands.

  • sshd-contrib - experimental code that is currently under review and may find its way into one of the other artifacts (or become an entirely new artifact - e.g., sshd-putty evolved this way).

Optional dependencies

Quick reference

Building the code

Including tests

mvn clean install

Without tests

mvn -Pquick clean install

Set up an SSH client in 5 minutes

Embedding an SSHD server instance in 5 minutes

SSH functionality breakdown

Security providers setup

Commands infrastructure

SCP

SFTP

Port forwarding

Internal support classes

Event listeners and handlers

Command line clients

GIT support

Configuration/data files parsing support

Extension modules

HOWTO(s)

Technical Documentation

SSH Key Exchange

TCP/IP Port Forwarding

Global Requests

Android support