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# Secure Shell Access {#sec-ssh}
Secure shell (SSH) access to your machine can be enabled by setting:
```nix
services.openssh.enable = true;
```
By default, root logins using a password are disallowed. They can be
disabled entirely by setting
[`services.openssh.permitRootLogin`](options.html#opt-services.openssh.permitRootLogin) to `"no"`.
You can declaratively specify authorised RSA/DSA public keys for a user
as follows:
```nix
users.users.alice.openssh.authorizedKeys.keys =
[ "ssh-dss AAAAB3NzaC1kc3MAAACBAPIkGWVEt4..." ];
```
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