modules: server and core modules

1 files changed, 39 insertions, 0 deletions

diff --git a/modules/core/software/access/ssh.nix b/modules/core/software/access/ssh.nix
new file mode 100644
index 0000000..665532f
--- /dev/null
+++ b/modules/core/software/access/ssh.nix
@@ -0,0 +1,39 @@
+{ lib, config, ... }:
+{
+  programs.ssh.startAgent = false;
+  security.pam.sshAgentAuth.enable = true;
+
+  services = {
+    fail2ban.jails.sshd.settings = {
+      enabled = true;
+      filter = "sshd[mode=aggressive]";
+      port = lib.strings.concatStringsSep "," (map toString config.services.openssh.ports);
+    };
+
+    openssh = {
+      enable = true;
+      ports = [ 22 ];
+      openFirewall = false;
+
+      settings = {
+        StreamLocalBindUnlink = "yes";
+        GatewayPorts = "clientspecified";
+
+        KexAlgorithms = [
+          "curve25519-sha256"
+          "[email protected]"
+          "diffie-hellman-group16-sha512"
+          "diffie-hellman-group18-sha512"
+          "diffie-hellman-group-exchange-sha256"
+          "[email protected]"
+        ];
+
+        Macs = [
+          "[email protected]"
+          "[email protected]"
+          "[email protected]"
+        ];
+      };
+    };
+  };
+}