nixpkgs/nixos/doc/manual/configuration/ssh.section.md
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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
[](#opt-services.openssh.settings.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..." ];
}
```