I believe that you get all you need with OpenSSH. You will also need a client on your computer, the one most used for Windows is WinSCP (easily found through a google search).
To start, you need to get the IP adress of your phone. Just go to Settings, Wi-Fi, and then select the network you are in. This will tell you your IP address.
Now start up WinSCP.
Where it says Host Name, you enter you IP Address.
Where it says User Name, you enter "Root" (minus the quotes)
Where it says Password, you enter "Alpine" (minus the quotes)
You then click Login, and should now have file access to your iPhone.