William Confer - Exploring SE for Android
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Discover Security Enhancements (SE) for Android to build your own protected Android-based systems
About This Book- Learn the fundamental security models and motivations behind Linux, SELinux, and SE for Android.
- Build and enable current security enhancements from the SE for Android project onto a working embedded UDOO board.
- Discover how to leverage SE for Android to secure your own projects in powerful ways using this step by step guide.
This book is intended for developers and engineers with some familiarity of operating system concepts as implemented by Linux. A basic background in C code would be helpful. Their positions range from hobbyists wanting to secure their Android powered creations to OEM engineers building handsets to engineers of emerging areas where Android is seeing growth.
What You Will Learn- Experiment with Linux and SELinux access controls
- Build custom Android kernels
- Backport SE for Android patches to different Android versions
- Explore binder and property services, what they are, and how and why SELinux integrates them
- Work with Android core internal systems like init and zygote
- Learn how to keep pace with and navigate the details of fast moving open source projects
- Overcome obstacles in policy development through directed experimentation
You will start by exploring the nature of the security mechanisms behind Linux and SELinux, and as you complete the chapters, you will integrate and enable SE for Android into a System on Chip (SoC), a process that, prior to this book, has never before been documented in its entirety! Discover Androids unique user space, from its use of the common UID and GID model to promote its security goals to its custom binder IPC mechanism. Explore the interface between the kernel and user space with respect to SELinux and investigate contexts and labels and their application to system objects.
This book will help you develop the necessary skills to evaluate and engineer secured products with the Android platform, whether you are new to world of Security Enhanced Linux (SELinux) or experienced in secure system deployment.
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Copyright 2015 Packt Publishing
All rights reserved. No part of this book may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, without the prior written permission of the publisher, except in the case of brief quotations embedded in critical articles or reviews.
Every effort has been made in the preparation of this book to ensure the accuracy of the information presented. However, the information contained in this book is sold without warranty, either express or implied. Neither the authors, nor Packt Publishing, and its dealers and distributors will be held liable for any damages caused or alleged to be caused directly or indirectly by this book.
Packt Publishing has endeavored to provide trademark information about all of the companies and products mentioned in this book by the appropriate use of capitals. However, Packt Publishing cannot guarantee the accuracy of this information.
First published: February 2015
Production reference: 1190215
Published by Packt Publishing Ltd.
Livery Place
35 Livery Street
Birmingham B3 2PB, UK.
ISBN 978-1-78439-059-4
www.packtpub.com
Authors
William Confer
William Roberts
Reviewers
Joshua Brindle
Hiromu Yakura
Commissioning Editor
Usha Iyer
Acquisition Editor
Reshma Raman
Content Development Editor
Arvind Koul
Technical Editor
Shiny Poojary
Copy Editors
Shivangi Chaturvedi
Vikrant Phadke
Neha Vyas
Project Coordinator
Neha Bhatnagar
Proofreaders
Paul Hindle
Stephen Silk
Indexer
Priya Sane
Production Coordinator
Conidon Miranda
Cover Work
Conidon Miranda
The first talk of SELinux on Android started almost as soon as Android was announced. The interest at that time was mainly shown by academic circles and developers of SELinux itself. As a longtime user of SELinux in server deployments, I knew its benefits from a security point of view and also knew how much Android could benefit from them.
At that time, I may have been coy about the reasons I wanted to commit some of the initial patches to the SELinux project. Looking back at the code reviews for those Android Open Source Project (AOSP) changes, I now remember how much resistance there was in the beginning. Space on devices was at a premium, and it was considered a victory if we could save a few kilobytes. And here were the SELinux libraries and policies that increased the system size by thirty kilobytes! The performance impact had not even been measured at that time.
The work continued unabated with SELinux contributors, such as Stephen Smalley, Robert Craig, Joshua Brindle, and an author of this book, William Roberts, as well as with the help of my coworkers Geremy Condra and Nick Kralevich at Google. Slowly, through the herculean efforts of everyone involved, the project materialized and became more and more complete. Since Android 4.4 KitKat, SELinux is shipped in enforcing mode, and all Android users can benefit from the added protection that it affords.
The tale doesn't end there! Now, it's your turn to learn. This book is the first reference available for the specific flavor of SELinux found in Android. It's my sincere hope that this book imparts the knowledge you need to understand and contribute to its continued development. William Roberts has been submitting code to AOSP since the beginning of SELinux for Android, and his and Dr. Confer's knowledge is contained in these pages. It's up to you to read it and help write the next chapter of this saga.
Kenny Root
Mountain View, CA
William Confer has been engineering embedded and mobile systems since 1997. He has worked for Samsung Mobile as a managing staff engineer and currently teaches computer science at SUNY Polytechnic Institute. He holds a patent in low-cost character recognition for extremely resource-limited devices and has multiple other patents pending for mobile technologies.
My wife, sa, sacrificed endlessly to help give me the space and time needed for this work, and I owe her more than I can say. My three daughters also ensured I couldn't always be working on this book and distracted me in the best possible ways. I couldn't rest if I didn't thank all my fall 2014 students from SUNY Polytechnic Institute who put up with me when I was sidetracked by this book. Finally, and most importantly, my greatest thanks goes to my coauthor (and friend, student, and teacher), William Roberts, without whom I would have to have found another.
William Roberts is a software engineer who is focused on OS-level security and platform enhancements. He is one of the engineers who founded the Samsung KNOX product and an early adopter of SE for Android. He has made contributions to several open source projects, such as SE for Android, the Android Open Source Project, the Linux Kernel, CyanogenMod, and OpenSC. His recent interests have taken him to Smart Card technologies and the virtualization of smart cards. In his spare time, he works with Dr. Confer on the Miniat project (http://www.miniat.org), a virtual, embedded architecture simulator.
I would like to thank Dr. William Confer, the coauthor, for helping me write this book; his contributions were invaluable. Also, I would like to thank my wife for supporting me and giving me the time to do this, even though we were renovating the house. Also, I would like to thank my family and friends for their encouragement along the way.
Joshua Brindle is the CTO and cofounder of Quark Security Inc., a company focused on solving mobile and cross-domain security problems. Joshua has 12 years of professional experience in the area of development for government, academic, and open source software that focuses on security in Linux. Joshua has contributed to numerous open source projects, both as a project maintainer and as a developer. His work can be found on all SELinux systems and nearly all Linux systems. Joshua's recent experience focuses on building secure mobile devices using technologies such as Security Enhancements for Android, mobile device, and application management.
Hiromu Yakura is a student at Nada High School, Japan. He is the youngest person to hold the national information security qualification from Japan. He has given lectures about SE for Android at many conferences. He is also familiar with the security competition, Capture the Flag (CTF), and has participated in DEF CON CTF 2014 as a team binja.
I would like to express my gratitude to my family for their understanding and support.
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