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| − | Difficulty: 3
| + | #REDIRECT [[SSH]] |
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| − | SSH without a password : Public-key authentication (UNIX and Mac OS X)
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| − | To execute this solution, the reader should:
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| − | be comfortable with the command line
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| − | Note: Logging in without a password will save you a few seconds out of every day. It comes however, with an added security risk: if someone compromises your
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| − | machine, they can then log into WSO with your account. If you are willing to bear this responsibility, then read on.
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| − | The basic idea is that WSO's server will check for a special key on your computer every time you log in, and if it checks out, you'll be allowed in without entering a password. If
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| − | you'd like a more in-depth explanation, read on:
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| − | http://the.earth.li/~sgtatham/putty/0.54/htmldoc/Chapter8.html#8
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| − | Anyway, enough chit-chat. Here's how to do it:
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| − | Adapted from http://bumblebee.lcs.mit.edu/ssh2/.
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| − | 1.Open a terminal
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| − | 2.Generate a public key and a private key. We'll copy the public key over to the server later.
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| − | $ ssh-keygen -t rsa -f ~/.ssh/id_rsa
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| − | 3.When it says something like Enter passphrase (empty for no passphrase):
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| − | Just press return.
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| − | 4.Let's copy the public key to WSO. Type
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| − | $ scp .ssh/id_rsa.pub user@wso:~/.ssh/.
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| − | 5.Cruise over to the WSO server:
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| − | $ ssh user@wso.williams.edu
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| − | 6.Hop into the SSH directory:
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| − | $ cd .ssh
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| − | 7.Append the key to your list of authorized keys:
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| − | $ cat id_rsa.pub >> authorized_keys2
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| − | 8.Change permissions:
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| − | $ chmod 640 authorized_keys2
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| − | 9.Kill the key.
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| − | $ rm id_rsa.pub
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| − | All done! Now you can SSH and SCP to WSO without a password.
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| − | -Evan Miller
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