duckietm/Nitro_Render_V3
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🆙 Camera Security fix / small fix for beds

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- Validate data URL format (must start with data:image/png)
- Validate PNG magic bytes on binary data before sending
- Enforce 2MB size limit matching server
- Add try/catch around atob() to handle invalid base64 gracefully
- Fix XSS vulnerability in editor download: replace unsafe window.open()+document.write()
  with safe anchor-based download that also validates data URL scheme
This commit is contained in:
duckietm
2026-03-18 09:21:36 +01:00
parent 19857075c0
commit 1162ff84cc
3 changed files with 64 additions and 9 deletions
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packages/communication/src/messages/outgoing/camera/RenderRoomMessageComposer.ts
+56 -6
View File
@@ -1,7 +1,10 @@
import { IMessageComposer } from '@nitrots/api';
import { TextureUtils } from '@nitrots/utils';
import { NitroLogger, TextureUtils } from '@nitrots/utils';
import { RenderTexture } from 'pixi.js';
const MAX_IMAGE_BYTES = 2 * 1024 * 1024;
const PNG_MAGIC_BYTES = [0x89, 0x50, 0x4E, 0x47];
export class RenderRoomMessageComposer implements IMessageComposer<ConstructorParameters<typeof RenderRoomMessageComposer>>
{
private _data: any;
@@ -27,16 +30,63 @@ export class RenderRoomMessageComposer implements IMessageComposer<ConstructorPa
if(!url) return;
const base64Data = url.split(',')[1];
const binaryData = Uint8Array.from(atob(base64Data), c => c.charCodeAt(0));
this._data.push(binaryData.byteLength, binaryData.buffer);
this.processBase64(url);
}
public assignBase64(base64: string): void
{
this.processBase64(base64);
}
private processBase64(base64: string): void
{
if(!base64 || !base64.includes(','))
{
NitroLogger.error('Camera: invalid base64 data URL');
return;
}
if(!base64.startsWith('data:image/png'))
{
NitroLogger.error('Camera: rejected non-PNG image data');
return;
}
const base64Data = base64.split(',')[1];
const binaryData = Uint8Array.from(atob(base64Data), c => c.charCodeAt(0));
if(!base64Data || !base64Data.length)
{
NitroLogger.error('Camera: empty base64 payload');
return;
}
let binaryData: Uint8Array;
try
{
binaryData = Uint8Array.from(atob(base64Data), c => c.charCodeAt(0));
}
catch(e)
{
NitroLogger.error('Camera: failed to decode base64 data');
return;
}
if(binaryData.byteLength > MAX_IMAGE_BYTES)
{
NitroLogger.error(`Camera: image too large (${binaryData.byteLength} bytes, max ${MAX_IMAGE_BYTES})`);
return;
}
if(binaryData.length < 4
|| binaryData[0] !== PNG_MAGIC_BYTES[0]
|| binaryData[1] !== PNG_MAGIC_BYTES[1]
|| binaryData[2] !== PNG_MAGIC_BYTES[2]
|| binaryData[3] !== PNG_MAGIC_BYTES[3])
{
NitroLogger.error('Camera: binary data does not have valid PNG header');
return;
}
this._data.push(binaryData.byteLength, binaryData.buffer);
}