diff --git a/infra/common/default.nix b/infra/common/default.nix
index b0372b0..f3fb04b 100644
--- a/infra/common/default.nix
+++ b/infra/common/default.nix
@@ -1 +1,6 @@
-{ imports = [ ./networking.nix ]; }
+{
+  imports = [
+    ./networking.nix
+    ./users.nix
+  ];
+}
diff --git a/infra/common/users.nix b/infra/common/users.nix
new file mode 100644
index 0000000..8bf33ac
--- /dev/null
+++ b/infra/common/users.nix
@@ -0,0 +1,38 @@
+{
+  users.users = {
+    procolix = {
+      isNormalUser = true;
+      extraGroups = [ "wheel" ];
+      hashedPassword = "$y$j9T$UH8Dh/poTCCZ3PXk43au6/$iYen8VUEVvv7SIPqteNtTPKktLxny3TbqvjUwhvi.6B";
+      openssh.authorizedKeys.keys = [
+        "ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEAotfCIjLoDlHOe+++kVS1xiBPaS8mC5FypgrxDrDVst6SHxMTca2+IScMajzUZajenvNAoZOwIsyAPacT8OHeyFvV5Y7G874Qa+cZVqJxLht9gdXxr1GNabU3RfhhCh272dUeIKIqfgsRsM2HzdnZCMDavS1Yo+f+RhhHhnJIua+NdVFo21vPrpsz+Cd0M1NhojARLajrTHvEXW0KskUnkbfgxT0vL9jeRZxdgMS+a9ZoR5dbzOxQHWfbP8N04Xc+7CweMlvKwlWuAE/xDb5XLNHorfGWFvZuVhptJN8jPaaVS25wsmsF5IbaAuSZfzCtBdFQhIloUhy0L6ZisubHjQ== procolix@sshnode1"
+        "ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEAuT3C0f3nyQ7SwUvXcFmEYEgwL+crY6iK0Bhoi9yfn4soz3fhfMKyKSwc/0RIlRnrz3xnkyJiV0vFeU7AC1ixbGCS3T9uc0G1x0Yedd9n2yR8ZJmkdyfjZ5KE4YvqZ3f6UZn5Mtj+7tGmyp+ee+clLSHzsqeyDiX0FIgFmqiiAVJD6qeKPFAHeWz9b2MOXIBIw+fSLOpx0rosCgesOmPc8lgFvo+dMKpSlPkCuGLBPj2ObT4sLjc98NC5z8sNJMu3o5bMbiCDR9JWgx9nKj+NlALwk3Y/nzHSL/DNcnP5vz2zbX2CBKjx6ju0IXh6YKlJJVyMsH9QjwYkgDQVmy8amQ== procolix@sshnode2"
+      ];
+    };
+
+    niols = {
+      isNormalUser = true;
+      extraGroups = [ "wheel" ];
+      openssh.authorizedKeys.keys = [
+        "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIEElREJN0AC7lbp+5X204pQ5r030IbgCllsIxyU3iiKY"
+      ];
+    };
+
+    valentin = {
+      isNormalUser = true;
+      extraGroups = [ "wheel" ];
+      openssh.authorizedKeys.keys = [
+        "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIOJzgwAYAoMexc1fBJxU08YmsiU9T4Ua8QFeE4/kZNZ5"
+      ];
+    };
+  };
+
+  security.sudo.wheelNeedsPassword = false;
+
+  ## FIXME: Remove direct root authentication once NixOps4 supports users with
+  ## password-less sudo.
+  users.root.openssh.authorizedKeys.keys = [
+    "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIEElREJN0AC7lbp+5X204pQ5r030IbgCllsIxyU3iiKY"
+    "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIJg5TlS1NGCRZwMjDgBkXeFUXqooqRlM8fJdBAQ4buPg"
+  ];
+}
diff --git a/infra/vm02116/configuration.nix b/infra/vm02116/configuration.nix
index b0e6ebd..1f1e58c 100644
--- a/infra/vm02116/configuration.nix
+++ b/infra/vm02116/configuration.nix
@@ -19,23 +19,6 @@
   # Select internationalisation properties.
   i18n.defaultLocale = "en_US.UTF-8";
 
-  # Define a user account. Don't forget to set a password with ‘passwd’.
-  users.users = {
-    procolix = {
-      isNormalUser = true;
-      extraGroups = [ "wheel" ]; # Enable ‘sudo’ for the user.
-      openssh.authorizedKeys.keys = [
-        "ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEAotfCIjLoDlHOe+++kVS1xiBPaS8mC5FypgrxDrDVst6SHxMTca2+IScMajzUZajenvNAoZOwIsyAPacT8OHeyFvV5Y7G874Qa+cZVqJxLht9gdXxr1GNabU3RfhhCh272dUeIKIqfgsRsM2HzdnZCMDavS1Yo+f+RhhHhnJIua+NdVFo21vPrpsz+Cd0M1NhojARLajrTHvEXW0KskUnkbfgxT0vL9jeRZxdgMS+a9ZoR5dbzOxQHWfbP8N04Xc+7CweMlvKwlWuAE/xDb5XLNHorfGWFvZuVhptJN8jPaaVS25wsmsF5IbaAuSZfzCtBdFQhIloUhy0L6ZisubHjQ== procolix@sshnode1"
-        "ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEAuT3C0f3nyQ7SwUvXcFmEYEgwL+crY6iK0Bhoi9yfn4soz3fhfMKyKSwc/0RIlRnrz3xnkyJiV0vFeU7AC1ixbGCS3T9uc0G1x0Yedd9n2yR8ZJmkdyfjZ5KE4YvqZ3f6UZn5Mtj+7tGmyp+ee+clLSHzsqeyDiX0FIgFmqiiAVJD6qeKPFAHeWz9b2MOXIBIw+fSLOpx0rosCgesOmPc8lgFvo+dMKpSlPkCuGLBPj2ObT4sLjc98NC5z8sNJMu3o5bMbiCDR9JWgx9nKj+NlALwk3Y/nzHSL/DNcnP5vz2zbX2CBKjx6ju0IXh6YKlJJVyMsH9QjwYkgDQVmy8amQ== procolix@sshnode2"
-      ];
-    };
-  };
-
-  users.users.root.openssh.authorizedKeys.keys = [
-    "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIEElREJN0AC7lbp+5X204pQ5r030IbgCllsIxyU3iiKY"
-    "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIJg5TlS1NGCRZwMjDgBkXeFUXqooqRlM8fJdBAQ4buPg"
-  ];
-
   # List packages installed in system profile. To search, run:
   # $ nix search wget
   environment.systemPackages = with pkgs; [
diff --git a/infra/vm02179/configuration.nix b/infra/vm02179/configuration.nix
index 1420ee9..e38180b 100644
--- a/infra/vm02179/configuration.nix
+++ b/infra/vm02179/configuration.nix
@@ -19,37 +19,6 @@
   # Select internationalisation properties.
   i18n.defaultLocale = "en_US.UTF-8";
 
-  # Define a user account. Don't forget to set a password with ‘passwd’.
-  users.users.root = {
-    hashedPassword = "$y$j9T$WXvLAUqArJJusuC017FCW0$.rfMOeyx/BsClkJFi5hLcynrSk.njWmfiB6Uy.9th3A";
-    openssh.authorizedKeys.keys = [
-      "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIEElREJN0AC7lbp+5X204pQ5r030IbgCllsIxyU3iiKY"
-      "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIJg5TlS1NGCRZwMjDgBkXeFUXqooqRlM8fJdBAQ4buPg"
-    ];
-  };
-
-  users.users.procolix = {
-    isNormalUser = true;
-    extraGroups = [ "wheel" ]; # Enable ‘sudo’ for the user.
-    hashedPassword = "$y$j9T$UH8Dh/poTCCZ3PXk43au6/$iYen8VUEVvv7SIPqteNtTPKktLxny3TbqvjUwhvi.6B";
-    openssh.authorizedKeys.keys = [
-      "ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEAotfCIjLoDlHOe+++kVS1xiBPaS8mC5FypgrxDrDVst6SHxMTca2+IScMajzUZajenvNAoZOwIsyAPacT8OHeyFvV5Y7G874Qa+cZVqJxLht9gdXxr1GNabU3RfhhCh272dUeIKIqfgsRsM2HzdnZCMDavS1Yo+f+RhhHhnJIua+NdVFo21vPrpsz+Cd0M1NhojARLajrTHvEXW0KskUnkbfgxT0vL9jeRZxdgMS+a9ZoR5dbzOxQHWfbP8N04Xc+7CweMlvKwlWuAE/xDb5XLNHorfGWFvZuVhptJN8jPaaVS25wsmsF5IbaAuSZfzCtBdFQhIloUhy0L6ZisubHjQ== procolix@sshnode1"
-      "ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEAuT3C0f3nyQ7SwUvXcFmEYEgwL+crY6iK0Bhoi9yfn4soz3fhfMKyKSwc/0RIlRnrz3xnkyJiV0vFeU7AC1ixbGCS3T9uc0G1x0Yedd9n2yR8ZJmkdyfjZ5KE4YvqZ3f6UZn5Mtj+7tGmyp+ee+clLSHzsqeyDiX0FIgFmqiiAVJD6qeKPFAHeWz9b2MOXIBIw+fSLOpx0rosCgesOmPc8lgFvo+dMKpSlPkCuGLBPj2ObT4sLjc98NC5z8sNJMu3o5bMbiCDR9JWgx9nKj+NlALwk3Y/nzHSL/DNcnP5vz2zbX2CBKjx6ju0IXh6YKlJJVyMsH9QjwYkgDQVmy8amQ== procolix@sshnode2"
-    ];
-    packages = with pkgs; [ ];
-  };
-
-  users.users.niols = {
-    isNormalUser = true;
-    extraGroups = [ "wheel" ]; # Enable ‘sudo’ for the user.
-    hashedPassword = "$y$j9T$zZZ/XQ68cGr6GTIQqSnsh/$I9UEl9JLxq8kWZbVOp.WqUxfcNmrSVMBGSwGalIJ/Z/";
-    openssh.authorizedKeys.keys = [
-      "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIEElREJN0AC7lbp+5X204pQ5r030IbgCllsIxyU3iiKY niols@wallace"
-      "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIBkQXv/VRZLfV0wNN9PHedmKWyAIfpPUCdaznHZNIDkS niols@orianne/fediversity"
-    ];
-    packages = with pkgs; [ ];
-  };
-
   nix = {
     settings.trusted-users = [ "@wheel" ];
   };
diff --git a/infra/vm02186/procolix-configuration.nix b/infra/vm02186/procolix-configuration.nix
index 497e147..691df9d 100644
--- a/infra/vm02186/procolix-configuration.nix
+++ b/infra/vm02186/procolix-configuration.nix
@@ -19,45 +19,6 @@
   # Select internationalisation properties.
   i18n.defaultLocale = "en_US.UTF-8";
 
-  # Define a user account. Don't forget to set a password with ‘passwd’.
-  users.users.root = {
-    hashedPassword = "$y$j9T$WXvLAUqArJJusuC017FCW0$.rfMOeyx/BsClkJFi5hLcynrSk.njWmfiB6Uy.9th3A";
-    openssh.authorizedKeys.keys = [
-      "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIEElREJN0AC7lbp+5X204pQ5r030IbgCllsIxyU3iiKY"
-      "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIJg5TlS1NGCRZwMjDgBkXeFUXqooqRlM8fJdBAQ4buPg"
-    ];
-  };
-
-  users.users.procolix = {
-    isNormalUser = true;
-    extraGroups = [ "wheel" ]; # Enable ‘sudo’ for the user.
-    hashedPassword = "$y$j9T$UH8Dh/poTCCZ3PXk43au6/$iYen8VUEVvv7SIPqteNtTPKktLxny3TbqvjUwhvi.6B";
-    openssh.authorizedKeys.keys = [
-      "ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEAotfCIjLoDlHOe+++kVS1xiBPaS8mC5FypgrxDrDVst6SHxMTca2+IScMajzUZajenvNAoZOwIsyAPacT8OHeyFvV5Y7G874Qa+cZVqJxLht9gdXxr1GNabU3RfhhCh272dUeIKIqfgsRsM2HzdnZCMDavS1Yo+f+RhhHhnJIua+NdVFo21vPrpsz+Cd0M1NhojARLajrTHvEXW0KskUnkbfgxT0vL9jeRZxdgMS+a9ZoR5dbzOxQHWfbP8N04Xc+7CweMlvKwlWuAE/xDb5XLNHorfGWFvZuVhptJN8jPaaVS25wsmsF5IbaAuSZfzCtBdFQhIloUhy0L6ZisubHjQ== procolix@sshnode1"
-      "ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEAuT3C0f3nyQ7SwUvXcFmEYEgwL+crY6iK0Bhoi9yfn4soz3fhfMKyKSwc/0RIlRnrz3xnkyJiV0vFeU7AC1ixbGCS3T9uc0G1x0Yedd9n2yR8ZJmkdyfjZ5KE4YvqZ3f6UZn5Mtj+7tGmyp+ee+clLSHzsqeyDiX0FIgFmqiiAVJD6qeKPFAHeWz9b2MOXIBIw+fSLOpx0rosCgesOmPc8lgFvo+dMKpSlPkCuGLBPj2ObT4sLjc98NC5z8sNJMu3o5bMbiCDR9JWgx9nKj+NlALwk3Y/nzHSL/DNcnP5vz2zbX2CBKjx6ju0IXh6YKlJJVyMsH9QjwYkgDQVmy8amQ== procolix@sshnode2"
-    ];
-    packages = with pkgs; [ ];
-  };
-
-  users.users.niols = {
-    isNormalUser = true;
-    extraGroups = [ "wheel" ]; # Enable ‘sudo’ for the user.
-    openssh.authorizedKeys.keys = [
-      "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIEElREJN0AC7lbp+5X204pQ5r030IbgCllsIxyU3iiKY niols@wallace"
-      "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIBkQXv/VRZLfV0wNN9PHedmKWyAIfpPUCdaznHZNIDkS niols@orianne/fediversity"
-    ];
-    packages = with pkgs; [ ];
-  };
-
-  users.users.valentin = {
-    isNormalUser = true;
-    extraGroups = [ "wheel" ]; # Enable ‘sudo’ for the user.
-    openssh.authorizedKeys.keys = [
-      "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIOJzgwAYAoMexc1fBJxU08YmsiU9T4Ua8QFeE4/kZNZ5"
-    ];
-    packages = with pkgs; [ ];
-  };
-
   # List packages installed in system profile. To search, run:
   # $ nix search wget
   environment.systemPackages = with pkgs; [
diff --git a/infra/vm02187/configuration.nix b/infra/vm02187/configuration.nix
index a7aab90..4304bd2 100644
--- a/infra/vm02187/configuration.nix
+++ b/infra/vm02187/configuration.nix
@@ -81,35 +81,6 @@
   # Select internationalisation properties.
   i18n.defaultLocale = "en_US.UTF-8";
 
-  # Define a user account. Don't forget to set a password with ‘passwd’.
-  users.users.root = {
-    hashedPassword = "$y$j9T$WXvLAUqArJJusuC017FCW0$.rfMOeyx/BsClkJFi5hLcynrSk.njWmfiB6Uy.9th3A";
-    openssh.authorizedKeys.keys = [
-      "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIEElREJN0AC7lbp+5X204pQ5r030IbgCllsIxyU3iiKY"
-      "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIJg5TlS1NGCRZwMjDgBkXeFUXqooqRlM8fJdBAQ4buPg"
-    ];
-  };
-
-  users.users.procolix = {
-    isNormalUser = true;
-    extraGroups = [ "wheel" ]; # Enable ‘sudo’ for the user.
-    hashedPassword = "$y$j9T$UH8Dh/poTCCZ3PXk43au6/$iYen8VUEVvv7SIPqteNtTPKktLxny3TbqvjUwhvi.6B";
-    openssh.authorizedKeys.keys = [
-      "ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEAotfCIjLoDlHOe+++kVS1xiBPaS8mC5FypgrxDrDVst6SHxMTca2+IScMajzUZajenvNAoZOwIsyAPacT8OHeyFvV5Y7G874Qa+cZVqJxLht9gdXxr1GNabU3RfhhCh272dUeIKIqfgsRsM2HzdnZCMDavS1Yo+f+RhhHhnJIua+NdVFo21vPrpsz+Cd0M1NhojARLajrTHvEXW0KskUnkbfgxT0vL9jeRZxdgMS+a9ZoR5dbzOxQHWfbP8N04Xc+7CweMlvKwlWuAE/xDb5XLNHorfGWFvZuVhptJN8jPaaVS25wsmsF5IbaAuSZfzCtBdFQhIloUhy0L6ZisubHjQ== procolix@sshnode1"
-      "ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEAuT3C0f3nyQ7SwUvXcFmEYEgwL+crY6iK0Bhoi9yfn4soz3fhfMKyKSwc/0RIlRnrz3xnkyJiV0vFeU7AC1ixbGCS3T9uc0G1x0Yedd9n2yR8ZJmkdyfjZ5KE4YvqZ3f6UZn5Mtj+7tGmyp+ee+clLSHzsqeyDiX0FIgFmqiiAVJD6qeKPFAHeWz9b2MOXIBIw+fSLOpx0rosCgesOmPc8lgFvo+dMKpSlPkCuGLBPj2ObT4sLjc98NC5z8sNJMu3o5bMbiCDR9JWgx9nKj+NlALwk3Y/nzHSL/DNcnP5vz2zbX2CBKjx6ju0IXh6YKlJJVyMsH9QjwYkgDQVmy8amQ== procolix@sshnode2"
-    ];
-    packages = with pkgs; [ ];
-  };
-
-  users.users.valentin = {
-    isNormalUser = true;
-    extraGroups = [ "wheel" ]; # Enable ‘sudo’ for the user.
-    openssh.authorizedKeys.keys = [
-      "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIOJzgwAYAoMexc1fBJxU08YmsiU9T4Ua8QFeE4/kZNZ5"
-    ];
-    packages = with pkgs; [ ];
-  };
-
   # List packages installed in system profile. To search, run:
   # $ nix search wget
   environment.systemPackages = with pkgs; [
@@ -130,8 +101,6 @@
     wget
   ];
 
-  security.sudo.wheelNeedsPassword = false;
-
   # This value determines the NixOS release from which the default
   # settings for stateful data, like file locations and database versions
   # on your system were taken. It‘s perfectly fine and recommended to leave