43 lines
1.2 KiB
Nix
43 lines
1.2 KiB
Nix
{ lib, config, configVars, ... }:
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let
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sshPort = configVars.networking.sshPort;
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# Sops needs access to the keys before the persist dirs are even mounted; so
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# just persisting the keys won't work, we must point at /persist
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hasOptinPersistence = false;
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in
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{
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services.openssh = {
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enable = true;
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ports = [ sshPort ];
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settings = {
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# Harden
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PasswordAuthentication = false;
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PermitRootLogin = "no";
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# Automatically remove stale sockets
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StreamLocalBindUnlink = "yes";
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# Allow forwarding ports to everywhere
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GatewayPorts = "clientspecified";
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};
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hostKeys = [{
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path = "${lib.optionalString hasOptinPersistence "/persist"}/etc/ssh/ssh_host_ed25519_key";
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type = "ed25519";
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}];
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# Fix LPE vulnerability with sudo use SSH_AUTH_SOCK: https://github.com/NixOS/nixpkgs/issues/31611
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authorizedKeysFiles = lib.mkForce [ "/etc/ssh/authorized_keys.d/%u" ];
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};
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# yubikey login / sudo
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# this potentially causes a security issue that we mitigated above
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security.pam = {
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sshAgentAuth.enable = true;
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services = {
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sudo.u2fAuth = true;
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};
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};
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networking.firewall.allowedTCPPorts = [ sshPort ];
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}
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