Download Android Security Internals: An In-Depth Guide to Android's by Nikolay Elenkov PDF

By Nikolay Elenkov

In Android protection Internals, most sensible Android safeguard professional Nikolay Elenkov takes us below the hood of the Android safeguard procedure. Elenkov describes Android defense structure from the ground up, delving into the implementation of significant security-related elements and subsystems, like Binder IPC, permissions, cryptographic services, and machine administration.

You'll learn:

How Android permissions are declared, used, and enforced
How Android manages software applications and employs code signing to make sure their authenticity
How Android implements the Java Cryptography structure (JCA) and Java safe Socket Extension (JSSE) frameworks
About Android's credential garage method and APIs, which enable functions shop cryptographic keys securely
About the web account administration framework and the way Google bills combine with Android
About the implementation of validated boot, disk encryption, lockscreen, and different equipment safeguard features
How Android's bootloader and restoration OS are used to accomplish complete process updates, and the way to acquire root access

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Extra info for Android Security Internals: An In-Depth Guide to Android's Security Architecture

Example text

This guarantees that an installed application cannot be replaced by another application that claims to have the same package name (unless it is signed with the same key, in which case the existing application is updated). We’ll discuss code signing and application packages in Chapter 3. The main components of Android apps are listed below. Activities An activity is a single screen with a user interface. Activities are the main building blocks of Android GUI applications. An application can have multiple activities and while they are usually designed to be displayed in a particular order, each activity can be started independently, potentially by a different app (if allowed).

Applications still run in permissive mode and violations are logged but do not cause runtime errors. ) System Updates Android devices can be updated over-the-air (OTA) or by connecting the device to a PC and pushing the update image using the standard Android debug bridge (ADB) client or some vendor-provided application with similar functionality. Because in addition to system files, an Android update might need to modify the baseband (modem) firmware, bootloader, and 9. org/page/SEAndroid Android’s Security Model 17 other parts of the device that are not directly accessible from Android, the update process typically uses a special-purpose, minimal OS with exclusive access to all device hardware.

These include files, signals, sockets, pipes, semaphores, shared memory, message queues, and so on. While Android uses some of these (such as local sockets), it does not support others (namely System V IPCs like semaphores, shared memory segments, and message queues). Binder Because the standard IPC mechanisms weren’t flexible or reliable enough, a new IPC mechanism called Binder was developed for Android. 6 Binder implements a distributed component architecture based on abstract interfaces. It is similar to Windows Common Object Model (COM) and Common Object Broker Request Architectures (CORBA) on Unix, but unlike those frameworks, it runs on a single device and does not support remote procedure calls (RPC) across the network (although RPC support could be implemented on top of Binder).

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