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

By Nikolay Elenkov

ISBN-10: 1593276419

ISBN-13: 9781593276416

In Android safety Internals, most sensible Android safeguard specialist Nikolay Elenkov takes us below the hood of the Android safeguard approach. Elenkov describes Android safety structure from the ground up, delving into the implementation of significant security-related parts and subsystems, like Binder IPC, permissions, cryptographic companies, and machine administration.

You'll learn:

How Android permissions are declared, used, and enforced
How Android manages software programs and employs code signing to ensure their authenticity
How Android implements the Java Cryptography structure (JCA) and Java safe Socket Extension (JSSE) frameworks
About Android's credential garage process and APIs, which allow functions shop cryptographic keys securely
About the net account administration framework and the way Google debts combine with Android
About the implementation of proven boot, disk encryption, lockscreen, and different gadget defense features
How Android's bootloader and restoration OS are used to accomplish complete approach updates, and the way to acquire root access

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Additional resources for Android Security Internals: An In-Depth Guide to Android's Security Architecture

Example text

Like the dynamic permission check in the example above, per-component permissions are also implemented by consulting the caller UID obtained from Binder under the hood. The system uses the package database to determine the permission required by the callee component, and then maps the Android’s Security Model 15 caller UID to a package name and retrieves the set of permissions granted to the caller. If the required permission is in that set, the call succeeds. If not, it fails and the system throws a SecurityException.

Reference counting guarantees that Binder objects are automatically freed when no one references them and is implemented in the kernel driver with the BC_INCREFS, BC_ACQUIRE, BC_RELEASE, and BC_DECREFS commands. Reference counting is integrated at various levels of the Android framework but is not directly visible to applications. Death notification allows applications that use Binder objects that are hosted by other processes to be notified when those processes are killed by the kernel and to perform any necessary cleanup.

Finally, it enables debugging if requested |. 4 introduces a new, experimental runtime called Android RunTime (ART), which is expected to replace Dalvik in a future version.

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


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