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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
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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
5
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
6
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
8
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
9
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
10
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
12
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
13
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
14
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
15
Index
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Index

Chapter 2. Mandatory Access Controls and SELinux

In Chapter 1, Linux Access Controls, we introduced some of the shortcomings of a discretionary access control system. In these systems, the owner of an object has full control over its permissions flags and can demonstrate greater capabilities (for example, the ability to chown) when executing as root or with certain capabilities. In this chapter, we will:

  • Examine the fundamentals of MAC
  • Introduce some industry drivers for SELinux
  • Discuss labels, users, roles, and types
  • Explore the implementation of tangible policy to allow and constrain object interaction

Ideal MAC systems maintain the property of providing definitive access controls on kernel resources, such as files, irrespective of an object's owner. For instance, with a MAC system, the owner of an object might not have full control of its permissions. In Linux, the MAC framework works orthogonally to the current DAC controls. This means that the MAC controls do not interfere...

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