imported>ThorstenStaerk |
imported>ThorstenStaerk |
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| − | With Linux, it is possible to log in to a remote computer without having to type a password. You authenticate yourself with your "digital signature" and your public key.
| + | ssh is a command to log in over the network to another computer. |
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| − | ;Goal: You want to log in using [[ssh]] to a remote computer without being asked for a password.
| + | ssh-related topics: |
| − | | + | * [[passwordless login]] |
| − | ;Solution: Establish a trust relationship so your desktop's ssh key is authorized on your server like this:
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| − | desktop:~ # ssh-keygen -t dsa
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| − | Generating public/private dsa key pair.
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| − | Enter file in which to save the key (/root/.ssh/id_dsa):
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| − | Enter passphrase (empty for no passphrase):
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| − | Enter same passphrase again:
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| − | Your identification has been saved in /root/.ssh/id_dsa.
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| − | Your public key has been saved in /root/.ssh/id_dsa.pub.
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| − | The key fingerprint is:
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| − | 1c:9a:b8:03:ab:04:b3:7b:75:49:99:8c:51:79:5d:06 root@scorpio
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| − | Now you just need to copy your public key to the remote machine so that it can recognize you:
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| − | desktop:~ # ssh-copy-id -i .ssh/id_dsa.pub root@server
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| − | In this example, you create a key pair with no passphrase and distribute the public key from the computer ''desktop'' to ''server''. The user root from ''desktop'' no longer needs to authenticate with his password, he can log in to ''server'' from ''desktop'' with the [[command]]
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| − | desktop:~ # ssh server
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| − | Welcome to server.
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| − | server:~ #
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| − | ;Explanation: The ssh folder contains a file authorized keys that contains host keys of trusted hosts. ssh-copy-id adds to this file. Instead of calling ssh-copy-id, you can also issue
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| − | desktop:~ # cat ~/.ssh/id_dsa.pub | ssh root@server "cat >>.ssh/authorized_keys"
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| − | However, this command is error-prone because on some distributions, e.g. Red Hat, the file authorized_keys needs special permission settings. Better stick to ssh-copy-id.
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