Introduce sops and sops-nix for secret management

Use the GPG keys used for the password-store noc directory for the admin
keys.
Switch the git hosts secret management from colmena to sops-nix.

https://github.com/getsops/sops
https://github.com/Mic92/sops-nix

.sops.yaml

@@ -0,0 +1,46 @@
+keys:
+  - &admin_gpg_djerun EF643F59E008414882232C78FFA8331EEB7D6B70
+  - &admin_gpg_stb F155144FC925A1BEA1F8A2C59A2A4CD59BFDC5EC
+  - &admin_gpg_jtbx 18DFCE01456DAB52EA38A6584EDC64F35FA1D6A5
+  - &admin_gpg_yuri 87AB00D45D37C9E9167B5A5A333448678B60E505
+  - &admin_gpg_june 91213ABAA73B0B73D3C02B5B4E5F372D17BBE67C
+  - &admin_gpg_haegar F38C9D4228FC6F674E322D9C3326D914EB9B8F55
+  - &admin_gpg_dario 5DA93D5C9D7320E1BD3522C79C78172B3551C9FD
+  - &admin_gpg_echtnurich 8996B62CBD159DCADD3B6DC08BB33A8ABCF7BC4A
+  - &admin_gpg_max 9DFA033E3DAEBAD7FDD71B056C7AAA54BE05F7BA
+  - &admin_gpg_c6ristian B71138A6A8964A3C3B8899857B4F70C356765BAB
+  - &admin_gpg_dante 3D70F61E07F64EC4E4EF417BEFCD9D20F58784EF
+  - &host_age_git age18zaq9xg9nhqyl8g7mvrqhsx4qstay5l9cekq2g80vx4920pswdfqpeafd7
+creation_rules:
+  - path_regex: config/hosts/git/.*
+    key_groups:
+      - pgp:
+          - *admin_gpg_djerun
+          - *admin_gpg_stb
+          - *admin_gpg_jtbx
+          - *admin_gpg_yuri
+          - *admin_gpg_june
+          - *admin_gpg_haegar
+          - *admin_gpg_dario
+          - *admin_gpg_echtnurich
+          - *admin_gpg_max
+          - *admin_gpg_c6ristian
+          - *admin_gpg_dante
+        age:
+          - *host_age_git
+  - key_groups:
+      - pgp:
+          - *admin_gpg_djerun
+          - *admin_gpg_stb
+          - *admin_gpg_jtbx
+          - *admin_gpg_yuri
+          - *admin_gpg_june
+          - *admin_gpg_haegar
+          - *admin_gpg_dario
+          - *admin_gpg_echtnurich
+          - *admin_gpg_max
+          - *admin_gpg_c6ristian
+          - *admin_gpg_dante
+stores:
+  yaml:
+    indent: 2

config/hosts/git/default.nix

@@ -8,5 +8,6 @@
     ./nginx.nix
     ./opensearch.nix
     ./redis.nix
+    ./sops.nix
   ];
 }

config/hosts/git/forgejo.nix

@@ -14,7 +14,7 @@
     enable = true;
     package = pkgs-unstable.forgejo;
     database.type = "postgres";
-    mailerPasswordFile = "/secrets/forgejo-git-smtp-password.secret";
+    mailerPasswordFile = "/run/secrets/forgejo_git_smtp_password";
 
     settings = {
       DEFAULT = {
@@ -77,14 +77,10 @@
     };
   };
 
-  deployment.keys = {
-    "forgejo-git-smtp-password.secret" = {
-      keyCommand = [ "pass" "noc/vm-secrets/chaosknoten/git/smtp_password" ];
-      destDir = "/secrets";
-      user = "forgejo";
+  sops.secrets."forgejo_git_smtp_password" = {
+    mode = "0440";
+    owner = "forgejo";
     group = "forgejo";
-      permissions = "0640";
-      uploadAt = "pre-activation";
-    };
+    restartUnits = [ "forgejo.service" ];
   };
 }

config/hosts/git/secrets.yaml

@@ -0,0 +1,233 @@
+forgejo_git_smtp_password: ENC[AES256_GCM,data:ZRj5GpQKRlTxdu5CfbJirRGAKPCLAIG1F0V5USz5m5D49V3lu5uLomxHapmEwb0yYoE7e7ZLYK4VQUoQgpUnSw==,iv:K7+9E2gi8cdYu0lX/HgWitLxnxARywIwh5glEL0uOsM=,tag:s9UC8e+E5E3vM6cTKW7Vqw==,type:str]
+sops:
+    kms: []
+    gcp_kms: []
+    azure_kv: []
+    hc_vault: []
+    age:
+        - recipient: age18zaq9xg9nhqyl8g7mvrqhsx4qstay5l9cekq2g80vx4920pswdfqpeafd7
+          enc: |
+            -----BEGIN AGE ENCRYPTED FILE-----
+            YWdlLWVuY3J5cHRpb24ub3JnL3YxCi0+IFgyNTUxOSA2ZFhrMlF1YnV6bHlJZFp1
+            SExjNXk0aTE3U2pBd0lHODlkZW9La1M2cHhjCjd1VTdKWkE2ZWxoMWFjREsvLzdS
+            K3lSSkRMZ3lLZ0tSaDZMRkt4MXBMeXcKLS0tIDFlVjNXcktpbHdJc2hraGNrNGJh
+            UHlJWFN4NW1tNWFCU2EyNjkveXZML3cKrKk1w3IBAgdmicuFyGOaU26fwpULAcy9
+            eZPlcbRPUPHoRhy9GhNTAcXXDQzimKL39XZGAd0U29Kt9AvWAf8Qpg==
+            -----END AGE ENCRYPTED FILE-----
+    lastmodified: "2024-05-25T14:17:29Z"
+    mac: ENC[AES256_GCM,data:JeqYsVtogbB4oMWNEpLsF6zxsgUoAt7UzRUL2JzxDUtXDUndW/AxJxVxQaipYvblA3q2MzRyQN+j9khavlL02DR/ANtZFLQmH3OREV7M9eHmeeCa4Lm5D7gFYmqWkULJ7yEJsKz5AaiJTWlWgCcBITB901H3Z12dsz2a1+4WrUc=,iv:5Xm5Rjw8PS7hkTcRD1kj5XS5uiOgsPwXYeaMqUReB7E=,tag:2Y5R1/Why1TQd+ZYTF0qDA==,type:str]
+    pgp:
+        - created_at: "2024-05-25T14:42:41Z"
+          enc: |-
+            -----BEGIN PGP MESSAGE-----
+
+            hQIMAxK/JaB2/SdtAQ/+Pw0v8i3ZGw4QNjAu9NX6ZJ5hvBHJgtcOWch3ZHlIAuxs
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+            9JOUdkYe2Q1T
+            =1km6
+            -----END PGP MESSAGE-----
+          fp: EF643F59E008414882232C78FFA8331EEB7D6B70
+        - created_at: "2024-05-25T14:42:41Z"
+          enc: |-
+            -----BEGIN PGP MESSAGE-----
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+            -----END PGP MESSAGE-----
+          fp: F155144FC925A1BEA1F8A2C59A2A4CD59BFDC5EC
+        - created_at: "2024-05-25T14:42:41Z"
+          enc: |-
+            -----BEGIN PGP MESSAGE-----
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+            -----END PGP MESSAGE-----
+          fp: 18DFCE01456DAB52EA38A6584EDC64F35FA1D6A5
+        - created_at: "2024-05-25T14:42:41Z"
+          enc: |-
+            -----BEGIN PGP MESSAGE-----
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+          fp: 87AB00D45D37C9E9167B5A5A333448678B60E505
+        - created_at: "2024-05-25T14:42:41Z"
+          enc: |-
+            -----BEGIN PGP MESSAGE-----
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+        - created_at: "2024-05-25T14:42:41Z"
+          enc: |-
+            -----BEGIN PGP MESSAGE-----
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+            -----BEGIN PGP MESSAGE-----
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+            -----END PGP MESSAGE-----
+          fp: 5DA93D5C9D7320E1BD3522C79C78172B3551C9FD
+        - created_at: "2024-05-25T14:42:41Z"
+          enc: |-
+            -----BEGIN PGP MESSAGE-----
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config/hosts/git/sops.nix

@@ -0,0 +1,7 @@
+{ ... }:
+
+{
+  sops = {
+    defaultSopsFile = ./secrets.yaml;
+  };
+}

flake.lock

@@ -52,6 +52,22 @@
         "type": "github"
       }
     },
+    "nixpkgs-stable": {
+      "locked": {
+        "lastModified": 1716061101,
+        "narHash": "sha256-H0eCta7ahEgloGIwE/ihkyGstOGu+kQwAiHvwVoXaA0=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "e7cc61784ddf51c81487637b3031a6dd2d6673a2",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "release-23.11",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
     "nixpkgs-unstable": {
       "locked": {
         "lastModified": 1716479278,
@@ -72,7 +88,29 @@
       "inputs": {
         "nixos-generators": "nixos-generators",
         "nixpkgs": "nixpkgs",
-        "nixpkgs-unstable": "nixpkgs-unstable"
+        "nixpkgs-unstable": "nixpkgs-unstable",
+        "sops-nix": "sops-nix"
+      }
+    },
+    "sops-nix": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ],
+        "nixpkgs-stable": "nixpkgs-stable"
+      },
+      "locked": {
+        "lastModified": 1716400300,
+        "narHash": "sha256-0lMkIk9h3AzOHs1dCL9RXvvN4PM8VBKb+cyGsqOKa4c=",
+        "owner": "Mic92",
+        "repo": "sops-nix",
+        "rev": "b549832718b8946e875c016a4785d204fcfc2e53",
+        "type": "github"
+      },
+      "original": {
+        "owner": "Mic92",
+        "repo": "sops-nix",
+        "type": "github"
       }
     }
   },

flake.nix

@@ -14,9 +14,16 @@
       url = "github:nix-community/nixos-generators";
       inputs.nixpkgs.follows = "nixpkgs";
     };
+
+    # Add sops-nix as an input for secret management.
+    # See here: https://github.com/Mic92/sops-nix?tab=readme-ov-file#flakes-current-recommendation
+    sops-nix = {
+      url = "github:Mic92/sops-nix";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
   };
 
-  outputs = { nixpkgs, nixpkgs-unstable, nixos-generators, ... }:
+  outputs = { nixpkgs, nixpkgs-unstable, nixos-generators, sops-nix, ... }:
     let
       # Shairport Sync 4.3.1 (with nqptp 1.2.4) with metadata, MQTT and AirPlay 2 support.
       shairportSync431ExtendedNixpkgsUnstableOverlay = final: prev: {
@@ -180,6 +187,7 @@
           imports = [
             ./config/common
             ./config/proxmox-vm
+            sops-nix.nixosModules.sops
             ./config/hosts/git
           ];
         };