feat: add YTP_DISABLE_EXEC to strip dangerous yt-dlp options

FAQ.md

@@ -60,6 +60,7 @@ or the `environment:` section in `compose.yaml` file.
 | YTP_THUMB_CONCURRENCY           | The number of concurrent ffmpeg thumbnail generations allowed.      | `2`                   |
 | YTP_THUMB_GENERATE              | Enable ffmpeg thumbnail generation when no local thumbnail exists.  | `true`                |
 | YTP_THUMB_SIDECAR               | Save generated thumbnails next to media instead of temp cache.      | `false`               |
+| YTP_DISABLE_EXEC                | Strip some dangerous yt-dlp options.                                | `false`               |
 
 > [!NOTE]
 > To raise the maximum workers for specific extractor, you need to add a ENV variable that follows the pattern `YTP_MAX_WORKERS_FOR_<EXTRACTOR_NAME>`.
@@ -143,6 +144,11 @@ a tool that by design can execute commands. Auth is the mechanism that controls
 YTPTube already gates other powerful features behind explicit opt-in: the built-in terminal, file browser actions and internal
 URL requests for example. The `cli` field is no different, its power is by design, and access control is your responsibility.
 
+> [!NOTE]
+> If you choose to run without authentication but still want to reduce at least some impact, you can set
+> `YTP_DISABLE_EXEC=true`. This strips some dangerous options at run time. However, understand that this is not a 
+> substitute for auth an unauthenticated API is still fully open for all other operations.
+
 # I cant download anything
 
 If you are receiving errors like:

app/features/ytdlp/ytdlp_opts.py

@@ -397,6 +397,30 @@ class YTDLPOpts:
 
         data: dict = merge_dict(user_cli, merge_dict(self._item_opts, merge_dict(self._preset_opts, default_opts)))
 
+        if self._config.disable_exec:
+            stripped: list[str] = []
+            if data.pop("netrc_cmd", None):
+                stripped.append("netrc_cmd")
+
+            if "postprocessors" in data:
+                exec_pps = [
+                    pp for pp in data["postprocessors"] if isinstance(pp, dict) and pp.get("key", "").startswith("Exec")
+                ]
+                if exec_pps:
+                    stripped.extend(pp.get("key") for pp in exec_pps)
+                    data["postprocessors"] = [
+                        pp
+                        for pp in data["postprocessors"]
+                        if not (isinstance(pp, dict) and pp.get("key", "").startswith("Exec"))
+                    ]
+
+            if stripped:
+                LOG.warning(
+                    "Stripped %d dangerous options from yt-dlp options.",
+                    len(stripped),
+                    extra={"stripped": stripped, "reason": "YTP_DISABLE_EXEC is enabled"},
+                )
+
         if not keep:
             self.reset()
 

app/library/config.py

@@ -110,6 +110,9 @@ class Config(metaclass=Singleton):
     auth_password: str | None = None
     """The password to use for basic authentication."""
 
+    disable_exec: bool = False
+    """Strip some dangerous yt-dlp options."""
+
     remove_files: bool = False
     """Remove downloaded files when removing the record."""
 
@@ -312,6 +315,7 @@ class Config(metaclass=Singleton):
         "check_for_updates",
         "thumb_generate",
         "thumb_sidecar",
+        "disable_exec",
     )
     "The variables that are booleans."