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  • Book Overview & Buying Exploring SE for Android
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Exploring SE for Android

Exploring SE for Android

By : Confer, Roberts
4 (3)
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Exploring SE for Android

Exploring SE for Android

4 (3)
By: Confer, Roberts
Buy this Book

Overview of this book

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.
Table of Contents (16 chapters)
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Preface
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Preface
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What this book covers
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What you need for this book
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Who this book is for
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Conventions
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Reader feedback
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Customer support
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1
1. Linux Access Controls
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1. Linux Access Controls
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Changing permission bits
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Changing owners and groups
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The case for more
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Capabilities model
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Android's use of DAC
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Glancing at Android vulnerabilities
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Summary
2
2. Mandatory Access Controls and SELinux
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2. Mandatory Access Controls and SELinux
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Getting back to the basics
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Labels
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Access vectors
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Multilevel security
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Putting it together
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Complexities and best practices
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Summary
3
3. Android Is Weird
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3. Android Is Weird
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Android's security model
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Binder
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Zygote – application spawn
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The property service
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Summary
4
4. Installation on the UDOO
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4. Installation on the UDOO
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Retrieving the source
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Flashing image on an SD card
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UDOO serial and Android Debug Bridge
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Flipping the switch
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It's alive
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Summary
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5. Booting the System
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5. Booting the System
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Policy load
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Fixing the policy version
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Summary
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6. Exploring SELinuxFS
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6. Exploring SELinuxFS
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Locating the filesystem
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Interrogating the filesystem
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Java SELinux API
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Summary
7
7. Utilizing Audit Logs
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7. Utilizing Audit Logs
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Upgrades – patches galore
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The audit system
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Interpreting SELinux denial logs
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Contexts
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Summary
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8. Applying Contexts to Files
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8. Applying Contexts to Files
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Labeling filesystems
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Examples and tools
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A side note on security
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Summary
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9. Adding Services to Domains
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9. Adding Services to Domains
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Init – the king of daemons
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Dynamic domain transitions
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Explicit contexts via seclabel
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Relabeling processes
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Limitations on app labeling
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Summary
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10. Placing Applications in Domains
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10. Placing Applications in Domains
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The case to secure the zygote
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Fortifying the zygote
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Summary
11
11. Labeling Properties
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11. Labeling Properties
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Labeling via property_contexts
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Permissions on properties
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Relabeling existing properties
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Creating and labeling new properties
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Special properties
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Summary
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12. Mastering the Tool Chain
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12. Mastering the Tool Chain
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Building subcomponents – targets and projects
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Exploring sepolicy's Android.mk
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Standalone tools
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Summary
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13. Getting to Enforcing Mode
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13. Getting to Enforcing Mode
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Updating to SEPolicy master
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Purging the device
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Setting up CTS
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Running CTS
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Gathering the results
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Authoring device policy
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Second policy pass
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Field trials
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Going enforcing
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Summary
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A. The Development Environment
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A. The Development Environment
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VirtualBox
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Ubuntu Linux 12.04 (precise pangolin)
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VirtualBox extension pack and guest additions
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Save time with shared folders
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The build environment
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Oracle Java 6
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Summary
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Index
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Index

Chapter 4. Installation on the UDOO

In order to continue our exploration, we will need to get a tangible system in place to work with. In this chapter, we will:

  • Build Android 4.3 for the UDOO from source
  • Flash an SD card with our boot images
  • Get the UDOO running while capturing logs
  • Establish an adb connection to the UDOO
  • Rebuild the kernel with SELinux support
  • Verify our SELinux UDOO image works as expected

We will start with the publicly available UDOO Android 4.3 Jelly Bean source code, which can be downloaded from http://www.udoo.org/downloads/. It is assumed you have a UDOO and have verified that it is functional. It is recommended you follow the instructions on the UDOO website for getting started with the Android 4.3 prebuilt image as an initial test (for more information, refer to http://www.udoo.org/getting-started/).

You will also need an appropriate development system for working with Android and a UDOO, but the details of this are beyond the scope of this chapter. An appendix...

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Tech Concepts
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Programming languages
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