{"record":{"id":"878f817eb1452eab","repo":"tauri-apps/tauri","slug":"missing-os-permission-to-access-path-path-e","errorCode":null,"errorMessage":"Missing OS permission to access path \"{path}\": {e}","messagePattern":"Missing OS permission to access path \"(.+?)\": (.+?)","errorType":"http","errorClass":null,"httpStatus":403,"severity":"error","filePath":"crates/tauri/src/protocol/asset.rs","lineNumber":68,"sourceCode":"\n  // Separate block for easier error handling\n  let mut file = match File::open(path.clone()) {\n    Ok(file) => file,\n    Err(e) => {\n      #[cfg(target_os = \"android\")]\n      {\n        if path.starts_with(\"/storage/emulated/0/Android/data/\") {\n          log::error!(\n            \"Failed to open Android external storage file '{path}': {e}. This may be due to missing storage permissions.\"\n          );\n        }\n      }\n      return if e.kind() == std::io::ErrorKind::NotFound {\n        log::error!(\"File does not exist at path: {path}\");\n        return resp.status(404).body(Vec::new().into()).map_err(Into::into);\n      } else if e.kind() == std::io::ErrorKind::PermissionDenied {\n        log::error!(\"Missing OS permission to access path \\\"{path}\\\": {e}\");\n        return resp.status(403).body(Vec::new().into()).map_err(Into::into);\n      } else {\n        Err(e.into())\n      };\n    }\n  };\n\n  let len = file.metadata()?.len();\n  let (mime_type, read_bytes) = {\n    // get file mime type\n    let nbytes = len.min(8192);\n    let mut magic_buf = Vec::with_capacity(nbytes as usize);\n    (&mut file).take(nbytes).read_to_end(&mut magic_buf)?;\n    file.rewind()?;\n    (\n      MimeType::parse(&magic_buf, &path),\n      // return the `magic_bytes` if we read the whole file\n      // to avoid reading it again later if this is not a range request\n      if len < 8192 { Some(magic_buf) } else { None },","sourceCodeStart":50,"sourceCodeEnd":86,"githubUrl":"https://github.com/tauri-apps/tauri/blob/460ec35447493200d64290dd7f015d5a91d0fd58/crates/tauri/src/protocol/asset.rs#L50-L86","documentation":"A PermissionDenied io error while opening the asset file means the OS refused access (file mode, ACLs, sandboxing, or missing Android storage permission). The handler logs this message and returns HTTP 403 with an empty body.","triggerScenarios":"File::open(path) inside get_response returns std::io::ErrorKind::PermissionDenied — e.g. restrictive file permissions, the process sandbox denies the path, or on Android external storage is accessed without READ_EXTERNAL_STORAGE / storage permission.","commonSituations":"Serving files from another user's home directory on Linux/macOS; Windows ACLs blocking the service account; Android scoped storage (no MANAGE_EXTERNAL_STORAGE or legacy storage flag) when reading shared storage.","solutions":["Fix OS-level permissions on the file/directory (chmod/chown or ACLs) so the app process can read it","On Android, declare and request storage permissions at runtime (or use the app's private storage)","Pick a source location the app can read (app data dir) or expose the file through a custom command with elevated handling"],"exampleFix":"// before (Android)\nlet path = \"/storage/emulated/0/DCIM/photo.jpg\"; // needs runtime permission\n// after\n// request READ_MEDIA_IMAGES / storage permission first, or copy into app storage\nlet path = app_data_dir.join(\"cache/photo.jpg\");","handlingStrategy":"fallback","validationCode":"// Rust-side pre-check before serving\nstd::fs::File::open(&path).map_err(|e| e.to_string())?; // fail early with a clear message","typeGuard":"function canRead(p: string): boolean {\n  try { fs.accessSync(p, fs.constants.R_OK); return true; } catch { return false; }\n}","tryCatchPattern":"const resp = await fetch(assetUrl);\nif (resp.status === 403) {\n  // ask user to grant permission / move file into app-accessible location\n  await invoke('request_storage_permission');\n}","preventionTips":["On Android, request storage permissions at runtime before reading shared storage","Ship source files inside app data dirs where permissions are guaranteed","Handle 403 from asset URLs by prompting instead of failing silently"],"tags":["tauri","permissions","http-403","android","filesystem"],"backgroundTag":"insufficient-permissions","analyzedSha":"460ec35447493200d64290dd7f015d5a91d0fd58","analyzedAt":"2026-09-18T23:55:51.277Z","contentChangedAt":"2026-09-18T23:55:51.277Z","schemaVersion":2},"datasetVersion":"2026-09-23T08:17:48.524Z"}