sops: first secret integration (nix-settings)

.sops.yaml

@@ -6,7 +6,12 @@ keys:
   - &machine_framenix age1kx93vp8l8jd6kz0kvk379udr5z8a9t6946w0ff5t9a2esn47nqzqlfzvwe
 creation_rules:
   # per-host secrets for host specific ones, but for service modules we could store and manage them also per module scope
-  - path_regex: hosts/framenix/secrets/[^/]+\.(yaml|json|env|ini)$
+  - path_regex: hosts/framenix/secrets\.(yaml|json|env|ini)$
+    key_groups:
+      - age:
+        - *admins
+        - *machine_framenix
+  - path_regex: common/secrets\.(yaml|json|env|ini)$
     key_groups:
       - age:
         - *admins

common/default.nix

@@ -18,6 +18,7 @@ in
     ./guest.nix
     ./audio-sharing.nix
     ./angrr.nix
+    ./sops.nix
   ];
 
   services.davfs2.enable = true;

common/nix-settings.nix

@@ -18,6 +18,22 @@ in
     };
     nixPath = lib.mapAttrsToList (key: value: "${key}=${value.to.path}") config.nix.registry;
   };
+  sops = {
+    secrets."nix/access-tokens" = {
+      owner = "root";
+      group = "users";
+      mode = "0440";
+      sopsFile = ./secrets.yaml;
+    };
+    templates.nix-secrets = {
+      content = ''
+        access-tokens = ${config.sops.placeholder."nix/access-tokens"}
+      '';
+      owner = "root";
+      group = "users";
+      mode = "0440";
+    };
+  };
   nix.settings = builtins.mapAttrs (_: lib.mkDefault) {
     # keep around all inputs necessary for offline-rebuilding the system
     keep-outputs = true;
@@ -35,6 +51,6 @@ in
   # TODO: manage access token with sops instead of manual deployment
   # permissions: needs to be readable by the user invoking nix and root (for nix daemon)
   nix.extraOptions = ''
-    !include /etc/nix/secrets.conf
+    !include ${config.sops.templates.nix-secrets.path}
   '';
 }

common/secrets.yaml

@@ -0,0 +1,26 @@
+nix:
+    access-tokens: ENC[AES256_GCM,data:0e58ZzTN81E/2BWphnGKRp8wM8CBOyC5JG2frU6pQ2a10DOwJBJiuv91H3IfHNq+YadNswQZhouQTczhIXlEIW3uADELSBhEiC/L8z9+zrgc4KyRLsMskipuCC3H,iv:DKnJmMs88QA4L9ozvYku4QGottrZVG3UFbw90XNzF0c=,tag:RoKuFIv/tJ/+ZF5aNzkpIQ==,type:str]
+sops:
+    age:
+        - recipient: age1q80zzsgglj438verw74jghezn8ndpqldvg0mfxzwtaq4v5h7apusqysavz
+          enc: |
+            -----BEGIN AGE ENCRYPTED FILE-----
+            YWdlLWVuY3J5cHRpb24ub3JnL3YxCi0+IFgyNTUxOSA4VmtBVGRNNTRuekxad24v
+            TmhpVm5BV2wwMkJVclNYd0RkcldtdHhQZlQ4CkVXeDRicStxdk9NdWZoWXRjUWdE
+            Q2ZibEpVMzR5MFMyalZqVklEajJtejQKLS0tIHhYczc2eFhuVVlQNGE1eTBuUURz
+            MEI3c2xoSmFneDNiMU40L2QwWC8zWGcKKpI1peaS0IVWxD/q52zDTbIBMkvsGSCy
+            3PbuFXZ0ksPpC3nVwTYI4g79X54dECLHQ5bIf4mefREX6wlP+EzdtQ==
+            -----END AGE ENCRYPTED FILE-----
+        - recipient: age1kx93vp8l8jd6kz0kvk379udr5z8a9t6946w0ff5t9a2esn47nqzqlfzvwe
+          enc: |
+            -----BEGIN AGE ENCRYPTED FILE-----
+            YWdlLWVuY3J5cHRpb24ub3JnL3YxCi0+IFgyNTUxOSB6bmtiREFLNmdmdVNOOXNm
+            YW5XbWJaMHJYMExMZlNEMHJjSlRXUWJ1bmhFCmNBT25odmtGS3oxRFB1U1V6MXo0
+            WWVHRk5oTi9DZ0t1c21WcnpSNjd2SmsKLS0tIGphQlFoSWFMVXJObmRLejR0QU54
+            S2orZUZqT1g4eGhEMXJQUHp0UDdhSTgK7w+ht6QrXN8fqgIgU/JCkrZW42JhfRp9
+            WSnwD5pLJduGVbxVlTRw2+EXFEglDp1WL11UTRj3K9Q3sCH3tH+p2Q==
+            -----END AGE ENCRYPTED FILE-----
+    lastmodified: "2026-04-05T22:12:29Z"
+    mac: ENC[AES256_GCM,data:5do9aK676jnIpaOldsL72W68BLKlWISBeeVglRCVtvYq/gmcmLAIESJli6XIRAURJmX7O61VnBDr5uGmH3jV0cb7s8zd6mxnWJOsnPIiKMNFiDg57W72R4iNsdeYINu6Y9HFfkXcI6HkP2eHdpzsVmmDvT7WuGS0Q6HgpbAbygM=,iv:DPdmA8LuSTNNsV0OTShi2pifhxpbITRbZAKYszDrFIU=,tag:fsOFaubD+LWG1pja6ttYYg==,type:str]
+    unencrypted_suffix: _unencrypted
+    version: 3.12.1

common/sops.nix

@@ -0,0 +1,11 @@
+{ lib, config, ... }:
+let
+  inputs = config.inputInjection.flake-inputs;
+in
+{
+  sops = {
+    age.sshKeyPaths = [ "/etc/ssh/ssh_host_ed25519_key" ];
+    defaultSopsFile = lib.mkDefault toString (./. + "/hosts/${config.networking.hostname}/secrets.ini");
+    defaultSopsFormat = "yaml"; # is the default. ini had some template rendering issues in practice
+  };
+}

darwin/configuration.nix

@@ -8,6 +8,7 @@ in
   imports = [
     ../common/nix-settings.nix
     ../common/angrr.nix
+    ./sops.nix
   ];
   nix = {
     enable = true;

darwin/sops.nix

@@ -0,0 +1,13 @@
+{
+  lib,
+  config,
+  pkgs,
+  ...
+}:
+{
+  sops = {
+    age.sshKeyPaths = [ "/etc/ssh/ssh_host_ed25519_key" ];
+    defaultSopsFile = lib.mkDefault ./secrets.yaml;
+    defaultSopsFormat = "yaml"; # is the default. ini had some template rendering issues in practice
+  };
+}

flake.nix

@@ -86,11 +86,11 @@
         };
       defaultModules = system: [
         inputInjection
-        sops-nix.nixosModules.sops
 
         # for some reason, `imports`-ing the home-manager module via inputInjection
         # from a sub-module causes infinite recursion, so importing it here instead
         home-manager.nixosModules.home-manager
+        inputs.sops-nix.nixosModules.sops
       ];
       mkSystem =
         system: extraModules:
@@ -105,9 +105,9 @@
           modules = [
             {
               imports = [
-                sops-nix.homeManagerModules.sops
                 ./home/common.nix
                 ./home/${confName}.nix
+                inputs.sops-nix.homeManagerModules.sops
               ];
               # extends the home config
               home.username = user;
@@ -148,7 +148,7 @@
           ./darwin/configuration.nix
           inputInjection
           inputs.angrr.darwinModules.angrr
-
+          inputs.sops-nix.darwinModules.sops
         ];
       };
       homeConfigurations = {

home/common.nix

@@ -13,6 +13,7 @@
     ./modules/captive-browser.nix
     ./modules/ensureDirs.nix
     ./modules/ssh.nix
+    ./modules/sops.nix
   ];
   home.homeDirectory =
     if pkgs.stdenv.isDarwin then "/Users/${config.home.username}" else "/home/${config.home.username}";

home/modules/sops.nix

@@ -0,0 +1,7 @@
+{ inputs, ... }:
+{
+  sops = {
+    age.keyFile = "/home/user/.age-key.txt"; # must have no password!
+    # deliberately not setting `defaultSopsFile` because there is no clear file-hostname-mapping. Each separate home config has to configure this explicitly.
+  };
+}