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automatic sftp

m_razesh
m_razesh asked
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Last Modified: 2013-12-26
I want to try automatic sftp of files using a script that runs on cron.

I've used automatic ftp in which you supply username & password too. But sftp seems to be different. Can anyone help me about how to achieve this?

Thanks,
m_razesh.
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Top Expert 2006
Commented:
Make sure that you have setup SSH for passwordless authentication and then it is trivial to use sftp. You might need you system admin's help in getting passwordless authentication to work.

http://acd.ucar.edu/~fredrick/mpark/ssh/rsa-unix.html
http://www.snailbook.com/faq/scripting-sftp.auto.html

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fridomCEO/Programmer
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Commented:
Another option is using ssh-agent, on the client machine and keep the key in it. As long as ssh-agent is running and the key have been added it is like passwordless usage.

Regards
Friedrich
Commented:
sftp uses the ssh protocol for authentication and encryption. You can still use username and password, but that usually means storing the password in plain text on the client end when you are automating it. ssh supports using public/private key authentication so that the user doesn't have to supply a password.

To set up ssh so that it doesn't use passwords:
1. On the client type: ssh-keygen -t rsa
  Accept the defaults, and don't enter a passphrase for the key.
2. Copy the line in ~/.ssh/id_rsa.pub (the public key) to the ~/.ssh/authorized_keys file on the server.
3. Make sure all .ssh/* on both ends are not world readable, writeable or browseable. ( chmod og-rwx .ssh/* )
4. Try it out from the client with:
   ssh <yourserver> ls -l
   It should moan the first time that it doesn't recognise the server. Accept the server's fingerprint. Subsequently it should be ok.
5. sftp should now authenticate automatically too.

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