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

By Nikolay Elenkov

In Android defense Internals, most sensible Android defense professional Nikolay Elenkov takes us less than the hood of the Android protection approach. Elenkov describes Android protection structure from the ground up, delving into the implementation of significant security-related parts and subsystems, like Binder IPC, permissions, cryptographic prone, and equipment administration.

You'll learn:

How Android permissions are declared, used, and enforced
How Android manages program programs 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 approach and APIs, which permit purposes shop cryptographic keys securely
About the web account administration framework and the way Google money owed combine with Android
About the implementation of established boot, disk encryption, lockscreen, and different machine safeguard features
How Android's bootloader and restoration OS are used to accomplish complete method 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

Sample text

If the Binder object implements multiple actions (by selecting the action to perform based on the code parameter of the Binder transaction), the caller can perform any action when it has a reference to that Binder object. If more granular access control is required, the implementation of each action needs to implement the necessary permission checks, typically by utilizing the PID and EUID of the caller process. A common pattern in Android is to allow all actions to callers running as system (UID 1000) or root (UID 0), but perform additional permission checks for all other processes.

Xml Here, the INTERNET permission is associated with the inet GID u, and the WRITE_EXTERNAL_STORAGE permission is associated with the sdcard_r and sdcard_rw GIDs v. Thus any process for an app that has been granted the INTERNET permission is associated with the supplementary GID corresponding to the inet group, and processes with the WRITE_EXTERNAL_STORAGE permission have the GIDs of sdcard_r and sdcard_rw added to the list of associated supplementary GIDs. The tag serves the opposite purpose: it is used to assign higher-level permissions to system processes running under a specific UID that do not have a corresponding package.

As Android has evolved, the original Harmony code has changed significantly. In the process, some features have been replaced entirely (such as internationalization support, the cryptographic provider, and some related classes), while others have been extended and improved. The core libraries are developed mostly in Java, but they have some native code dependencies as well. Native code is linked into Android’s Java libraries using the standard Java Native Interface (JNI), 5 which allows Java code to call native code and vice versa.

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