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OpenSSH 5.4: Great Scott!

• Mar 09, 2010 by the_angry_angel
• Unix-like, Windows, Work, System Administration and SSH

One point twenty one jiggawatts! Yesterday (March 8, 2010) the OpenSSH project released version 5.4 and naturally will start hitting the various distributions and platforms soon, and again there are some great things to be interested in:

• Although many distributions of OpenSSH have SSH1 disabled, the project is now shipping with SSH1 disabled by default.
• There is the ability to revoke keys (host and user) in both sshd and ssh.
• Netcat mode connects stdio on the client to a single port forward on the server. For example the following would connect to smtp.server.example.org on port 25, and redirect the output to stdio on my client side. Useful if you need to test connectivity to a mail server, but can't from your direct location, but can from your SSH server (my.ssh.server.example.org). ssh -W smtp.server.example.org:25 my.ssh.server.example.org That has pretty much bags of possibilities, ranging from simple connection tests to piping a file to a remote server that you can't get to directly.
• sftp-server has gained a read only mode!
• Passphrase-protected SSH2 private keys are now protected with AES-128 instead of 3DES. This counts if you reencrypt your key or create a new one.

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