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Linux scripts and passwordless authentication

Posted on 2013-12-18
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Last Modified: 2013-12-19
I can get this scp command to work

scp test.file root@xxclnt2:/home
root@xxclnt2's password:

But as you can see it requires a password

How can I turn off the password authentication required of scp commands ?

Thanks
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Question by:Los Angeles1
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3 Comments
 
LVL 10

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acbxyz earned 334 total points
ID: 39727968
You can use a private key for authentication instead of a password:
a) create a private/public keypair with ssh-keygen
b) copy the line in your public key to the file root@xxclnt2:/root/.ssh/authorized_keys
c) set the right permissions:
root@xxclnt2# chown root.root ~/.ssh ~/.ssh/authorized_keys
root@xxclnt2# chmod 700 .ssh
root@xxclnt2# chmod 600 .ssh/authorized_keys

Open in new window

d) use scp -i yourprivatekey.id_rsa
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Assisted Solution

by:acbxyz
acbxyz earned 334 total points
ID: 39727988
As a (very bad) option b) you can search for sshpass.
http://www.linuxquestions.org/questions/linux-newbie-8/how-to-add-password-paramtre-to-ssh-command-807560/
But to repeat , you should not use a password (especially root) as command line argument.
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Assisted Solution

by:serialband
serialband earned 166 total points
ID: 39728021
Once you've created your passphrase and loaded your public key into the remote systems ~/.ssh/authorized_keys file, acbxyz instructed, run the following.

eval ssh-agent
ssh-add YOUR_PRIVATE_KEY

It will prompt you for your passphrase once per open terminal session.  Afterwards, all your ssh calls to remote systems that you've added your public key to will use the cached ssh key credentials.
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