By Nikolay Elenkov
In Android safeguard Internals, most sensible Android safeguard professional Nikolay Elenkov takes us lower than the hood of the Android protection 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 services, and equipment administration.
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 enable purposes 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 machine protection features
How Android's bootloader and restoration OS are used to accomplish complete method updates, and the way to procure root access
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Extra resources for Android Security Internals: An In-Depth Guide to Android's Security Architecture
List file (see Listing 1-5 on page 14). Process Attribute Assignment Before we see how the kernel and lower-level system services check and enforce permissions, we need to examine how Android application processes are started and assigned process attributes. As discussed in Chapter 1, Android applications are implemented in Java and are executed by the Dalvik VM. Thus each application process is in fact a Dalvik VM process executing the application’s bytecode. In order to reduce the application memory footprint and improve startup time, Android does not start a new Dalvik VM process for each application.
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). Services A service is a component that runs in the background and has no user interface. Services are typically used to perform some long-running operation, such as downloading a file or playing music, without blocking the user interface.
Inter-process communication is implemented with a single ioctl() call that both sends and receives data through the binder_write_read structure, which consists of a write_buffer containing commands for the driver, and a read_buffer containing commands that the userspace needs to perform. But how is data actually passed between processes? The Binder driver manages part of the address space of each process. The Binder drivermanaged chunk of memory is read-only to the process, and all writing 6. com/~hackbod/openbinder/docs/html/ Android’s Security Model 5 is performed by the kernel module.
Android Security Internals: An In-Depth Guide to Android's Security Architecture by Nikolay Elenkov