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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
Old 07-10-2013
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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sftp-server(1M) 					  System Administration Commands					   sftp-server(1M)

NAME
sftp-server - SFTP server subsystem SYNOPSIS
/usr/lib/ssh/sftp-server DESCRIPTION
sftp-server implements the server side of the SSH File Transfer Protocol as defined in the IETF draft-ietf-secsh-filexfer. sftp-server is a subsystem for sshd(1M) and must not be run directly. There are no options or config settings. To enable the sftp-server subsystem for sshd add the following to /etc/ssh/sshd_config: Subsystem sftp /usr/lib/ssh/sftp-server See sshd_config(4) for a description of the format and contents of that file. There is no relationship between the protocol used by sftp-server and the FTP protocol (RFC 959) provided by in.ftpd. EXIT STATUS
The following exit values are returned: 0 Successful completion. >0 An error occurred. FILES
/usr/lib/sftp-server ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWsshdu | +-----------------------------+-----------------------------+ |Interface Stability |Evolving | +-----------------------------+-----------------------------+ SEE ALSO
sftp(1), ssh(1), ssh-add(1), ssh-keygen(1), sshd(1M), sshd_config(4), attributes(5) To view license terms, attribution, and copyright for OpenSSH, the default path is /var/sadm/pkg/SUNWsshdr/install/copyright. If the Solaris operating environment has been installed anywhere other than the default, modify the given path to access the file at the installed location. AUTHOR
Markus Friedl SunOS 5.10 30 Jul 2003 sftp-server(1M)
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