Password protected ssh keys

[leso-kn]

It would be a really useful feature to be able to use password protected ssh keys for authentication.

For a quick implementation, the existing password field could be used for storing the keys password.

On the long term, an option to not store the password would be ideal. In this case there could be a prompt for unlocking the key (asking for the password) which would then remain unlocked for a specified timeout maybe:

1. User attempts to access sftp share
2. FileManagerUtils prompts for the ssh key password
3. Password gets cached, files can be accessed (no further password prompt)
4. e.g. 5 minutes pass without an access or write operation to the share
   • password is removed from the cache
5. User attempts to access sftp share again
6. FileManagerUtils prompts for the password again