Wednesday, November 14, 2012

Automatic Login Without Password to Ubuntu from Mac

Every time I work with my Mac, I always need to connect to my Ubuntu Server for Time Machine, shared Folder, and other purposes. If you haven't followed how to setup your fileserver for your Mac using Ubuntu, you can read this article. I use ssh to connect to Ubuntu from Mac.

The problem is, you always have to login and type password to Ubuntu in order to able mounting volumes in Ubuntu. Since this task is done every time you work with your Mac and Ubuntu, you can generate authorized key that trust machine(s) you want to connect. This approach can ease your connectivity and it is very handy when you want to automate something via script.

Generate the Key

Turn on both your Mac and Ubuntu. Go to your Mac, open terminal, and type:

ssh-keygen -t rsa

You will be asked to enter a passphrase. Press enter if you don't want to use passphrase. Press enter again to confirm. You will see the result something like the below.

Generating public/private rsa key pair.
Enter file in which to save the key (/Users/Cornext/.ssh/id_rsa):
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /Users/Cornext/.ssh/id_rsa.
Your public key has been saved in /Users/Cornext/.ssh/
The key fingerprint is:
cb:72:ee:02:51:7d:31:06:59:01:c3:6f:2b:31:52:8d Cornext@Mac-mini.local
The key's randomart image is:
+--[ RSA 2048]----+
|   o ..=B.       |
|  E o +.o=       |
|   . . o  .      |
|  . +   o        |
|   . + oS        |
|    o..o         |
|    .o+ .        |
|     o..         |
|       ..        |

Authorise Ubuntu Machine

Now let's create the authorized keys in Ubuntu machine. Still from your Mac, type the command below, change username as your username in Ubuntu, and ubuntumachine as your ubuntu machine name, or you can use IP address of your Ubuntu machine.

ssh username@ubuntumachine mkdir -p .ssh

Enter the password for Ubuntu. Then append Mac's new public key to username@ubuntumachine:.ssh/authorized_keys and enter Ubuntu's password.

cat .ssh/ | ssh username@ubuntumachine 'cat >> .ssh/authorized_keys'

To login to ubuntu, now you will not be asked for password.

ssh username@ubuntumachine

That's it. Now you can login from Mac to Ubuntu without password and you can use it easily in your script.

Source: SSH login without password


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