# iOS UIActivity Sharing
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# UIActivity Sharing Semplificato
A partire da iOS 6, le applicazioni di terze parti possono **condividere dati** come testo, URL o immagini utilizzando meccanismi come AirDrop, come descritto nella [guida alla comunicazione tra app](https://developer.apple.com/library/archive/documentation/iPhone/Conceptual/iPhoneOSProgrammingGuide/Inter-AppCommunication/Inter-AppCommunication.html#//apple_ref/doc/uid/TP40007072-CH6-SW3) di Apple. Questa funzionalità si manifesta attraverso un _foglio di attività di condivisione_ a livello di sistema che appare interagendo con il pulsante "Condividi".
Un elenco completo di tutte le opzioni di condivisione integrate è disponibile in [UIActivity.ActivityType](https://developer.apple.com/documentation/uikit/uiactivity/activitytype). Gli sviluppatori possono scegliere di escludere specifiche opzioni di condivisione se le ritengono inadeguate per la loro applicazione.
## **Come Condividere Dati**
L'attenzione dovrebbe essere rivolta a:
- La natura dei dati condivisi.
- L'inclusione di attività personalizzate.
- L'esclusione di determinati tipi di attività.
La condivisione è facilitata attraverso l'istanza di un `UIActivityViewController`, al quale vengono passati gli elementi destinati alla condivisione. Questo si ottiene chiamando:
```bash
$ rabin2 -zq Telegram\ X.app/Telegram\ X | grep -i activityItems
0x1000df034 45 44 initWithActivityItems:applicationActivities:
```
Developers should scrutinize the `UIActivityViewController` for the activities and custom activities it's initialized with, as well as any specified `excludedActivityTypes`.
## **Come Ricevere Dati**
The following aspects are crucial when receiving data:
- The declaration of **tipi di documento personalizzati**.
- The specification of **tipi di documento che l'app può aprire**.
- The verification of the **integrità dei dati ricevuti**.
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.
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.
## Dynamic Testing Approach
To test **invio di attività**, one could:
- Hook into the `init(activityItems:applicationActivities:)` method to capture the items and activities being shared.
- Identify excluded activities by intercepting the `excludedActivityTypes` property.
For **ricezione di elementi**, it involves:
- Sharing a file with the app from another source (e.g., AirDrop, email) that prompts the "Open with..." dialogue.
- Hooking `application:openURL:options:` among other methods identified during static analysis to observe the app's response.
- Employing malformed files or fuzzing techniques to evaluate the app's robustness.
## References
* [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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