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84 lines
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84 lines
5.4 KiB
Markdown
# iOS UIActivity Sharing
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{% hint style="success" %}
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Learn & practice AWS Hacking:<img src="/.gitbook/assets/arte.png" alt="" data-size="line">[**HackTricks Training AWS Red Team Expert (ARTE)**](https://training.hacktricks.xyz/courses/arte)<img src="/.gitbook/assets/arte.png" alt="" data-size="line">\
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Learn & practice GCP Hacking: <img src="/.gitbook/assets/grte.png" alt="" data-size="line">[**HackTricks Training GCP Red Team Expert (GRTE)**<img src="/.gitbook/assets/grte.png" alt="" data-size="line">](https://training.hacktricks.xyz/courses/grte)
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<details>
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<summary>Support HackTricks</summary>
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* Check the [**subscription plans**](https://github.com/sponsors/carlospolop)!
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* **Join the** 💬 [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** us on **Twitter** 🐦 [**@hacktricks\_live**](https://twitter.com/hacktricks\_live)**.**
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* **Share hacking tricks by submitting PRs to the** [**HackTricks**](https://github.com/carlospolop/hacktricks) and [**HackTricks Cloud**](https://github.com/carlospolop/hacktricks-cloud) github repos.
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</details>
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{% endhint %}
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# UIActivity Sharing Simplified
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From iOS 6 onwards, third-party applications have been enabled to **share data** such as text, URLs, or images using mechanisms like AirDrop, as outlined in Apple's [Inter-App Communication guide](https://developer.apple.com/library/archive/documentation/iPhone/Conceptual/iPhoneOSProgrammingGuide/Inter-AppCommunication/Inter-AppCommunication.html#//apple_ref/doc/uid/TP40007072-CH6-SW3). This feature manifests through a system-wide _share activity sheet_ that surfaces upon interacting with the "Share" button.
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A comprehensive enumeration of all the built-in sharing options is available at [UIActivity.ActivityType](https://developer.apple.com/documentation/uikit/uiactivity/activitytype). Developers may opt to exclude specific sharing options if they deem them unsuitable for their application.
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## **How to Share Data**
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Attention should be directed towards:
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- The nature of the data being shared.
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- The inclusion of custom activities.
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- The exclusion of certain activity types.
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Sharing is facilitated through the instantiation of a `UIActivityViewController`, to which the items intended for sharing are passed. This is achieved by calling:
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```bash
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$ rabin2 -zq Telegram\ X.app/Telegram\ X | grep -i activityItems
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0x1000df034 45 44 initWithActivityItems:applicationActivities:
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```
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Developers should scrutinize the `UIActivityViewController` for the activities and custom activities it's initialized with, as well as any specified `excludedActivityTypes`.
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## **How to Receive Data**
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The following aspects are crucial when receiving data:
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- The declaration of **custom document types**.
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- The specification of **document types the app can open**.
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- The verification of the **integrity of the received data**.
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Without access to the source code, one can still inspect the `Info.plist` for keys like `UTExportedTypeDeclarations`, `UTImportedTypeDeclarations`, and `CFBundleDocumentTypes` to understand the types of documents an app can handle and declare.
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A succinct guide on these keys is available on [Stackoverflow](https://stackoverflow.com/questions/21937978/what-are-utimportedtypedeclarations-and-utexportedtypedeclarations-used-for-on-i), highlighting the importance of defining and importing UTIs for system-wide recognition and associating document types with your app for integration in the "Open With" dialogue.
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## Dynamic Testing Approach
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To test **sending activities**, one could:
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- Hook into the `init(activityItems:applicationActivities:)` method to capture the items and activities being shared.
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- Identify excluded activities by intercepting the `excludedActivityTypes` property.
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For **receiving items**, it involves:
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- Sharing a file with the app from another source (e.g., AirDrop, email) that prompts the "Open with..." dialogue.
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- Hooking `application:openURL:options:` among other methods identified during static analysis to observe the app's response.
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- Employing malformed files or fuzzing techniques to evaluate the app's robustness.
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## References
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* [https://mobile-security.gitbook.io/mobile-security-testing-guide/ios-testing-guide/0x06h-testing-platform-interaction](https://mobile-security.gitbook.io/mobile-security-testing-guide/ios-testing-guide/0x06h-testing-platform-interaction)
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{% hint style="success" %}
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Learn & practice AWS Hacking:<img src="/.gitbook/assets/arte.png" alt="" data-size="line">[**HackTricks Training AWS Red Team Expert (ARTE)**](https://training.hacktricks.xyz/courses/arte)<img src="/.gitbook/assets/arte.png" alt="" data-size="line">\
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Learn & practice GCP Hacking: <img src="/.gitbook/assets/grte.png" alt="" data-size="line">[**HackTricks Training GCP Red Team Expert (GRTE)**<img src="/.gitbook/assets/grte.png" alt="" data-size="line">](https://training.hacktricks.xyz/courses/grte)
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<details>
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<summary>Support HackTricks</summary>
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* Check the [**subscription plans**](https://github.com/sponsors/carlospolop)!
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* **Join the** 💬 [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** us on **Twitter** 🐦 [**@hacktricks\_live**](https://twitter.com/hacktricks\_live)**.**
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* **Share hacking tricks by submitting PRs to the** [**HackTricks**](https://github.com/carlospolop/hacktricks) and [**HackTricks Cloud**](https://github.com/carlospolop/hacktricks-cloud) github repos.
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</details>
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{% endhint %}
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