42 lines
1.2 KiB
Markdown
42 lines
1.2 KiB
Markdown
# Secure SSH
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## Disable root
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Edit `/etc/ssh/sshd_config` and set `PermitRootLogin no` or if you really need root access, e.g. for backups set `PermitRootLogin forced-commands-only`.
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## Use Public Key Authentication
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Create a new key pair on your client:
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```
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ssh-keygen -b 4096
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```
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Remember the path and password you choosed. Append the created public key from `/<your-path>/<key-name>.pub` on your client in the `/home/<user>/.ssh/authorized_keys` on your server. Alternatively you can use the command `ssh-copy-id` on your local client. For this command you can do the following:
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```bash
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ssh-copy-id -i /<your-path>/<key-name>.pub user@host
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```
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Now edit `/etc/ssh/sshd_config` on your server and set the following values:
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```
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PubkeyAuthentication yes
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AuthorizedKeysFile .ssh/authorized_keys
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PasswordAuthentication no
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```
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If you changed the path you can add the following to your `~/.ssh/config` file on your client:
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```
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Host <your-host-or-ip>
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User <the-server-username> # optional
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IdentityFile /<your-path>/<key-name>
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IdentitiesOnly yes # useful if you have problems when trying to login
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```
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## Apply Changes
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To apply changes you made in the ssh config simply run `systemctl restart ssh.service` or `service ssh restart`.
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