wip

flake.nix

@@ -110,6 +110,16 @@
         modules = [
           agenix.nixosModules.default
           { environment.systemPackages = [ (agenix.packages.${system}.default) ]; }
+          {
+            age.secrets = {
+              postgres-user-password-pda = {
+                file = ./secrets/postgres-user-password-pda.age;
+                owner = "postgres";
+                group = "postgres";
+                mode = "0400";
+              };
+            };
+          }
           ./hosts/sql
         ];
       };

hosts/sql/default.nix

@@ -9,13 +9,10 @@
 
   networking = {
     hostName = "sql";
-    firewall = {
+    firewall.extraInputRules = ''
-      enable = true;
+      ip saddr 195.160.173.0/24 ip daddr 195.160.173.15 tcp dport 5432 accept
-      extraInputRules = ''
+      ip6 saddr 2001:678:760:cccb::/64 ip6 daddr 2001:678:760:cccb::15 tcp dport 5432 accept
-        ip saddr 195.160.173.0/24 ip daddr 195.160.173.15 tcp dport 5432 accept
+    '';
-        ip6 saddr 2001:678:760:cccb::/64 ip6 daddr 2001:678:760:cccb::15 tcp dport 5432 accept
-      '';
-    };
   };
 
   services = {

hosts/sql/postgres.nix

@@ -1,8 +1,42 @@
-{ config, ... }:
+{ config, pkgs, ... }:
 
 let
   fqdn = "sql.${config.networking.domain}";
-  mkEntry = "fancy function that takes a name and IP octed and creates a user, db and auth lines";
+  # Create postgres-<username> entry in agenix
+  # mkEntry <username> <last IP address octet>
+  entries = [
+    (mkEntry "matrix-synapse" 25)
+    (mkEntry "hedgedoc" 24)
+  ];
+
+  mkEntry = name: octet: {
+    user = {
+      name = name;
+      ensureDBOwnership = true;
+    };
+    database = name;
+    # TYPE DATABASE USER ADDRESS METHOD
+    auth = ''
+      #hostssl ${name} ${name} 195.160.173.${toString octet}/32         scram-sha-256
+      #hostssl ${name} ${name} 2001:678:760:cccb::${toString octet}/128 scram-sha-256
+      host ${name} ${name} 195.160.173.${toString octet}/32         scram-sha-256
+      host ${name} ${name} 2001:678:760:cccb::${toString octet}/128 scram-sha-256
+    '';
+  };
+  mkPasswordSQL = e: ''
+    DO $do$
+    BEGIN
+      IF EXISTS (SELECT 1 FROM pg_roles WHERE rolname = '${e.user.name}') THEN
+        EXECUTE format(
+          'ALTER ROLE %I WITH PASSWORD %L',
+          '${e.user.name}',
+          trim(both E'\n' from pg_read_file('${config.age.secrets.postgres-${entry.user.name}.path}'))
+        );
+      END IF;
+    END
+    $do$;
+  '';
+  passwordScript = pkgs.writeText "postgres-passwords.sql" (builtins.concatStringsSep "\n" (map mkPasswordSQL entries));
 in
 {
   services = {
@@ -21,23 +55,16 @@ in
       #  ssl_key_file = "${config.security.acme.certs."${fqdn}".directory}/server.key";
       #  ssl_ca_file = "${config.security.acme.certs."${fqdn}".directory}/ca.crt";
       #};
-      ensureUsers = [
+      ensureUsers = map (e: e.user) entries;
-        {
+      ensureDatabases = map (e: e.database) entries;
-          name = "pda";
+      authentication = "${builtins.concatStringsSep "\n" (map (e: e.auth) entries)}";
-          ensureDBOwnership = true;
-        }
-      ];
-      ensureDatabases = [
-        "pda"
-      ];
-      authentication = ''
-        # TYPE  DATABASE  USER  ADDRESS                   METHOD
-        #hostssl pda       pda   195.160.173.15/32         scram-sha-256
-        #hostssl pda       pda   2001:678:760:cccb::15/128 scram-sha-256
-        host    pda       pda   195.160.173.15/32         scram-sha-256
-        host    pda       pda   2001:678:760:cccb::15/128 scram-sha-256
-      '';
     };
   };
+  systemd.services.postgresql.postStart = ''
+    ${pkgs.postgresql}/bin/psql \
+      --dbname=postgres \
+      --no-password \
+      --file=${passwordScript}
+  '';
 }
 

secrets/secrets.nix

@@ -15,6 +15,8 @@ let
   ];
 
   _matrix = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIApAkkhHLj918co/wUGuyW8WCPYHxsNM4uo32XDEu7VV root@matrix";
+  _md = "";
+  _sql = "";
 in
 {
   "matrix_admin_password.age".publicKeys = users;
@@ -25,4 +27,6 @@ in
   "pushover_user_key.age".publicKeys = users ++ [ _matrix ];
   "grafana_admin_password.age".publicKeys = users ++ [ _matrix ];
   "grafana_secret_key.age".publicKeys = users ++ [ _matrix ];
+  "postgres-matrix-synapse.age".publicKeys = users ++ [ _sql _matrix ];
+  "postgres-hedgedoc.age".publicKeys = users ++ [ _sql _md ];
 }