Changing from FTP to SFTP server Post: 302831053

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Top Forums UNIX for Dummies Questions & Answers Changing from FTP to SFTP server Post 302831053 by bakunin on Wednesday 10th of July 2013 06:26:37 AM

07-10-2013

Registered User

Quote:

Originally Posted by warmboy610

Will I have to somehow generate this username and password into a ssh key; or I can create a separate ssh key (separate from my existing user name and password).

This actually is discussed in the man page of "ssh" at length. I suggest you read this.

Suppose you are userA@hostA and want o connect to hostB as userB:
Basically, you connect to the remote system once using standard username/password authentication. Then you generate an ssh-key on this remote system as the authenticated user. Transfer this generated key (this is a long string, you can either put it into a text file and transfer this, but even copy&paste would work) to the machine you connected from. There you have a "keyring" file ("hostA/~userA/.ssh/authorized_keys"), where you simply append this string. From now on, when you attempt to connect to hostB as userB coming from hostA as userA the ssh (or sftp) software provides this key and the remote system - instead of asking a password - takes this as authentication.

Note that this will not work both ways: the above would only provide passwordless access as userA@hostA to userB@hostB. To connect to hostA as userA coming from hostB as userB you would have to generate another key and transfer it in the other direction first.

Note also that this only authenticates a single host/user pair: If userA@hostA can connect passwordless to hostB as userB this neither means that userB@hostA can do the same or that userA@hostA can connect as userA@hostB without a password. You would have to generate and exchange keys first as these user/host combinations to make it work.

Another thing: generate keys only ONCE. If you want to connect as userB@hostB coming from userA@hostA as well as userB@hostA then connect to hostB as userB first, generate the key and put this key into the keyring file of userA@hostA as well as userB@hostA. Do NOT generate 2 keys!

I hope this helps.

bakunin

Last edited by bakunin; 07-10-2013 at 07:32 AM..

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LEARN ABOUT FREEBSD

ssh-copy-id

SSH-COPY-ID(1)						    BSD General Commands Manual 					    SSH-COPY-ID(1)

NAME

     ssh-copy-id -- copy public keys to a remote host

SYNOPSIS

     ssh-copy-id [-lv] [-i keyfile] [-o option] [-p port] [user@]hostname

DESCRIPTION

     The ssh-copy-id utility copies public keys to a remote host's ~/.ssh/authorized_keys file (creating the file and directory, if required).

     The following options are available:

     -i file
	     Copy the public key contained in file.  This option can be specified multiple times and can be combined with the -l option.  If a
	     private key is specified and a public key is found then the public key will be used.

     -l      Copy the keys currently held by ssh-agent(1).  This is the default if the -i option was not specified.

     -o ssh-option
	     Pass this option directly to ssh(1).  This option can be specified multiple times.

     -p port
	     Connect to the specified port on the remote host instead of the default.

     -v      Pass -v to ssh(1).

     The remaining arguments are a list of remote hosts to connect to, each one optionally qualified by a user name.

EXIT STATUS

     The ssh-copy-id utility exits 0 on success, and >0 if an error occurs.

EXAMPLES

     To send a specific key to multiple hosts:
	   $ ssh-copy-id -i /path/to/keyfile.pub user@host1 user@host2 user@host3

HISTORY

     The ssh-copy-id utility was written by Eitan Adler <eadler@FreeBSD.org> as a drop-in replacement for an existing utility included with
     OpenSSH.

BSD
								 February 28, 2014							       BSD

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