nixos/tandoor-recipes: update MEDIA_ROOT remediation docs

In preparation for the upcoming GHSA, update the remediation docs for
Tandoor Recipes.

Signed-off-by: Sefa Eyeoglu <contact@scrumplex.net>

nixos/doc/manual/redirects.json

@@ -65,12 +65,17 @@
   "module-services-keycloak-unix-socket": [
     "index.html#module-services-keycloak-unix-socket"
   ],
-  "module-services-tandoor-recipes-migrating-media-option-1": [
+  "module-services-tandoor-recipes-migrating-media-option-move": [
+    "index.html#module-services-tandoor-recipes-migrating-media-option-move",
     "index.html#module-services-tandoor-recipes-migrating-media-option-1"
   ],
-  "module-services-tandoor-recipes-migrating-media-option-2": [
+  "module-services-tandoor-recipes-migrating-media-option-postgresql": [
+    "index.html#module-services-tandoor-recipes-migrating-media-option-postgresql",
     "index.html#module-services-tandoor-recipes-migrating-media-option-2"
   ],
+  "module-services-tandoor-recipes-migrating-media-option-disallow-access": [
+    "index.html#module-services-tandoor-recipes-migrating-media-option-disallow-access"
+  ],
   "sec-override-nixos-test": [
     "index.html#sec-override-nixos-test"
   ],

nixos/modules/services/misc/tandoor-recipes.md

@@ -1,19 +1,53 @@
 # Tandoor Recipes {#module-services-tandoor-recipes}
 
-## Dealing with `MEDIA_ROOT` for installations prior 26.05 {#module-services-tandoor-recipes-migrating-media}
+## Remediating insecure `MEDIA_ROOT` for installations prior to 26.05 {#module-services-tandoor-recipes-migrating-media}
 
-See https://github.com/NixOS/nixpkgs/issues/338339 for some background.
+Tandoor Recipes installations initialized with `system.stateVersion < 26.05`
+may suffer from a security vulnerability. To remediate this issue, apply one of
+the recommendations below.
 
-### Option 1: Migrate media to new `MEDIA_ROOT` {#module-services-tandoor-recipes-migrating-media-option-1}
+See [NixOS/nixpkgs#338339](https://github.com/NixOS/nixpkgs/issues/338339) and
+[GHSA-g8w3-p77x-mmxh](https://github.com/NixOS/nixpkgs/security/advisories/GHSA-g8w3-p77x-mmxh)
+for some background.
+
+### Recommended: Move `MEDIA_ROOT` into a subdirectory {#module-services-tandoor-recipes-migrating-media-option-move}
+
+The issue is only present when `MEDIA_ROOT` is the same as the data directory. Moving it into a subdirectory of `/var/lib/tandoor-recipes` remediates this and any similar issues in the future.
 
 1. Stop the currently running service: `systemctl stop tandoor-recipes.service`
 2. Create a media folder. NixOS `26.05` creates the media path at `/var/lib/tandoor-recipes/media` by default, but you may choose any other path as well. `mkdir -p /var/lib/tandoor-recipes/media`
 3. Move existing media to the new path: `mv /var/lib/tandoor-recipes/{files,recipes} /var/lib/tandoor-recipes/media`
 4. Set `services.tandoor-recipes.extraConfig.MEDIA_ROOT = "/var/lib/tandoor-recipes/media";` in your NixOS configuration (not needed if `system.stateVersion >= 26.05`).
-5. Rebuild and switch!
+5. If not using `GUNICORN_MEDIA`, update your reverse proxy / web server configuration accordingly.
+6. Rebuild and switch!
 
 These changes can be reverted by moving the files back into the state directory.
 
-### Option 2: Keep existing directory (may be insecure) {#module-services-tandoor-recipes-migrating-media-option-2}
+### Not recommended: Switch to PostgreSQL {#module-services-tandoor-recipes-migrating-media-option-postgresql}
 
-To keep the existing directory, set `services.tandoor-recipes.extraConfig.MEDIA_ROOT = "/var/lib/tandoor-recipes";`.
+When using an external database like PostgreSQL (the only other option available in Tandoor Recipes) this issue does not manifest.
+
+A simple PostgreSQL configuration can be enabled using the option
+[`services.tandoor-recipes.database.createLocally`](https://search.nixos.org/options?channel=unstable&show=services.tandoor-recipes.database.createLocally).
+
+Note that this will require migrating the existing database to PostgreSQL. Refer to the [upstream documentation](https://docs.tandoor.dev/system/migration_sqlite-postgres/) for this procedure. It is important to delete or move the `db.sqlite3` file out of the media path, after this has been done.
+
+More information on configuring PostgreSQL can be found in the [upstream documentation](https://docs.tandoor.dev/system/configuration/#database).
+
+Set the following option to ignore the evaluation warnings once `db.sqlite3` has been deleted.
+
+```nix
+{
+  services.tandoor-recipes.extraConfig.MEDIA_ROOT = "/var/lib/tandoor-recipes";
+}
+```
+
+As future releases of Tandoor Recipes could add additional files to the data
+directory, this is not a future-proof solution.
+
+### Not recommended: Disallow access to `db.sqlite3` {#module-services-tandoor-recipes-migrating-media-option-disallow-access}
+
+When using a web server like nginx, access to this file can be disabled.
+
+As future releases of Tandoor Recipes could add additional files to the data
+directory, this is not a future-proof solution.