TikTok 的应用程序日志都记录了什么内容？

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TikTok 的应用程序日志都记录了什么内容？

2020 年 10 月 11 日 InfoQ

作者 | Elliot Alderson

译者 | Sambodhi

策划 | 赵钰莹

近日，TikTok 的命运可谓一波三折。本文，我们来看下黑客对 TikTok 的研究结果吧。

本文最初发表在 Medium 博客，经原作者 Elliot Alderson 授权，InfoQ 中文站翻译并分享。

自从我发表第一篇文章《TikTok 用什么算法传输并加密内容？》(TikTok: Logs, Logs, Logs) 以来，发生了很多事情。

微软证实，该公司正在寻求收购 TikTok 在美国、澳大利亚、加拿大和新西兰的业务。
特朗普本应在 8 月 2 日禁止 TikTok，随后威胁称，除非有美国公司收购，否则 TikTok 将在 9 月 15 日“关闭”。最后，他签署了一项行政命令，要求 TikTok 的中国母公司字条跳动必须在从周四开始的 45 天中完成出售交易，规定期限一过，将不允许任何美国的个人或企业与其进行交易。又签署了一项行政命令，将在 45 天后禁止美国管辖下的个人或公司与拥有微信的中国公司腾讯进行 “任何交易”。
特朗普后来改变了主意，给了 TikTok 一个新的最后期限： 90 天，而不是原先称的 45 天。
《华尔街日报》透露，TikTok 在 2019 年 11 月之前，在未经用户同意的情况下，一直跟踪用户设备的 MAC 地址。

我们还是用事实说话，以更好地了解 TikTok。

1 免责声明

TikTok 为用户提供了大量功能，这要归功于它高达数百万行的代码。因此，仅靠一篇文章是不可能涵盖像“TikTok 是否对国家安全构成威胁？”这样宽泛而模糊的问题答案。因此，我计划在一系列文章中讨论该问题，每篇文章都有特定的主题。
我是一名法国安全研究员，多年来，一直在分析移动应用程序。你可以在 http://fs0c131y.com/press 网站找到我的公开作品，在 http://twitter.com/fs0c131y 找到我。
我的目标完全透明，就是分享我知道的所有内容。
如果想跳过技术细节，可以在本文末尾找到总结。

2 前言

在我上一篇文章《TikTok 用什么算法传输并加密内容？》(TikTok: Logs, Logs, Logs) 中，我对 TikTok 发出的 app_log 网络请求的内容进行了解密。

完成解密后，有一个问题仍然存在：

事件记录。我需要仔细研究一下他们认为的“事件”是什么，但就我所知，这似乎是一个相当标准的分析解决方案。

在本文中，我将回答以下问题：TikTok 的应用程序日志的定义是什么？

3 什么是 TikTok 的应用程序日志？

我们的起点是 app_log 这一关键字。为了解 TikTok 是如何处理应用程序日志的，我对应用程序进行了反编译，并分析了源代码。我很快在 DBHelper 类中找到了 ss_app_log.db 的定义。

这很有趣，TikTok 使用本地数据库来存储应用程序日志。我特意查看了测试用的手机才确认这一点。

正如你所见，TikTok 创建了许多数据库。如果你打开 ss_app_log.db 这个文件，你可以在事件表中找到一些数据。

这些方法的签名给我们提供了 3 个新对象：LogEvent、LogPage、LogSession。

这回答了我们最初的问题！TikTok 的应用程序日志可以是 LogEvent、LogPage 或 LogSession。

4 这些应用程序日志（实际上）里面有什么？

很好，我找到了不同日志对象的定义，但 TikTok 真正发送的是什么呢？

是时候用 Frida 拦截 DBHelper 类的 6 种插入方法了。

通过这种方法，我得到了 TikTok 在使用应用程序时创建的所有应用程序日志的详细信息。下面是日志会话、日志事件和日志以及杂项日志的示例。

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