By Nikolay Elenkov
In Android safety Internals, best Android safety professional Nikolay Elenkov takes us below the hood of the Android safety approach. 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 companies, and equipment administration.
How Android permissions are declared, used, and enforced
How Android manages software applications 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 procedure and APIs, which allow functions shop cryptographic keys securely
About the web account administration framework and the way Google debts combine with Android
About the implementation of confirmed boot, disk encryption, lockscreen, and different gadget safety features
How Android's bootloader and restoration OS are used to accomplish complete procedure updates, and the way to acquire root access
Read Online or Download Android Security Internals: An In-Depth Guide to Android's Security Architecture PDF
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Extra info for Android Security Internals: An In-Depth Guide to Android's Security Architecture
This process is device-specific and is typically implemented by using an unchangeable, hardware-specific key that 10. txt 18 Chapter 1 is “burned” (written to write-only memory) into the device. That key is used to verify the integrity of each bootloader level and eventually the kernel. ) Summary Android is a privilege-separated operating system based on the Linux kernel. Higher-level system functions are implemented as a set of cooperating system services that communicate using an IPC mechanism called Binder.
The top-level window of each activity is associated with a Binder token (called a window token), which Android’s window manager (the system service responsible for managing application windows) keeps track of. Applications can obtain their own window token but cannot get access to the window tokens of other applications. Typically you don’t want other applications adding or removing windows on top of your own; each request to do so must provide the window token associated with the application, thus guaranteeing that window requests are coming from your own application or from the system.
List. list Here, the first field is the package name, the second is the UID assigned to the application, the third is the debuggable flag (1 if debuggable), the fourth is the application’s data directory path, and the fifth is the seinfo label (used by SELinux). The last field is a list of the supplementary GIDs that the app launches with. Each GID is typically associated with an Android permission (discussed next) and the GID list is generated based on the permissions granted to the application.