Cyberduck Mountain Duck CLI

Version 1 (modified by dkocher, on Feb 4, 2008 at 2:42:02 PM) (diff)

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Cyberduck Help / Howto

SSH

How to configure public key authentication?

Public-key authentication allows you to connect to a remote server without sending your password over the Internet. Public-key authentication uses two keys, a private key that only you have--it should be kept in a secure place and protected with a password. And the public key, which is placed on the server you wish to gain access to, usually by the system administrator when your account is set up.

  1. Run the command ssh-keygen from the Terminal.app to generate a public/private pair of keys. They will be put in your directory ~/.ssh

, though you will probably be asked to approve or change this location. When you generate the keys you will be asked for a 'passphrase'. If you use a passphrase then you will have to enter it each time you use the keys for authentication. That is, you will have to type in the pass phrase everytime you log in, just as you would with a password. If you don't enter a passphrase (just press the return key) then you will be allowed to log-in without having to enter a passphrase. This is less secure, but it can be really useful.

jungle:~/.ssh dkocher$ ssh-keygen -t rsa
  1. Copy the public key to the remote host you wish to access and add it to the file authorized_keys in your ~/.ssh directory. (If that file does not exist then you should create it.) Anybody listed in the authorized_keys file (via their public key) is allowed to log-in, provided that they can prove that they possess the corresponding private key. Thus if you have the private key in your .ssh directory on your home machine you'll be allowed in.
jungle:~/.ssh dkocher$ ssh hostname < id_rsa.pub 'cat >> .ssh/authorized_keys'
  1. In the Connection Dialog or the Bookmark editor in Cyberduck select Use Public Key Authentication and select the private key in your .ssh directory.