SELinux Cookbook

SELinux Cookbook

By : Sven Vermeulen

Buy this Book

SELinux Cookbook

By: Sven Vermeulen

Buy this Book

Overview of this book

SELinux Cookbook

Credits

About the Author

About the Reviewers

www.PacktPub.com

Preface

Free Chapter

The SELinux Development Environment

Introduction

Creating the development environment

Building a simple SELinux module

Calling refpolicy interfaces

Creating our own interface

Using the refpolicy naming convention

Distributing SELinux policy modules

Dealing with File Labels

Introduction

Defining file contexts through patterns

Using substitution definitions

Enhancing an SELinux policy with file transitions

Setting resource-sensitivity labels

Configuring sensitivity categories

Confining Web Applications

Introduction

Listing conditional policy support

Enabling user directory support

Assigning web content types

Using different web server ports

Using custom content types

Creating a custom CGI domain

Setting up mod_selinux

Starting Apache with limited clearance

Mapping HTTP users to contexts

Using source address mapping to decide on contexts

Separating virtual hosts with mod_selinux

Creating a Desktop Application Policy

Introduction

Researching the application's logical design

Creating a skeleton policy

Setting context definitions

Defining application role interfaces

Testing and enhancing the policy

Ignoring permissions we don't need

Creating application resource interfaces

Adding conditional policy rules

Adding build-time policy decisions

Creating a Server Policy

Introduction

Understanding the service

Choosing resource types wisely

Differentiating policies based on use cases

Creating resource-access interfaces

Creating exec, run, and transition interfaces

Creating a stream-connect interface

Creating the administrative interface

Setting Up Separate Roles

Introduction

Managing SELinux users

Mapping Linux users to SELinux users

Running commands in a specified role with sudo

Running commands in a specified role with runcon

Switching roles

Creating a new role

Initial role based on entry

Defining role transitions

Looking into access privileges

Choosing the Confinement Level

Introduction

Finding common resources

Defining common helper domains

Documenting common privileges

Granting privileges to all clients

Creating a generic application domain

Building application-specific domains using templates

Using fine-grained application domain definitions

Debugging SELinux

Introduction

Identifying whether SELinux is to blame

Analyzing SELINUX_ERR messages

Logging positive policy decisions

Looking through SELinux constraints

Ensuring an SELinux rule is never allowed

Using strace to clarify permission issues

Using strace against daemons

Auditing system behavior

Aligning SELinux with DAC

Introduction

Assigning a different root location to regular services

Using a different root location for SELinux-aware applications

Sharing user content with file ACLs

Enabling polyinstantiated directories

Configuring capabilities instead of setuid binaries

Using group membership for role-based access

Backing up and restoring files

Governing application network access

Handling SELinux-aware Applications

Introduction

Controlling D-Bus message flows

Restricting service ownership

Understanding udev's SELinux integration

Using cron with SELinux

Checking the SELinux state programmatically

Querying SELinux userland configuration in C

Interrogating the SELinux subsystem code-wise

Running new processes in a new context

Reading the context of a resource

Index

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Chapter 6. Setting Up Separate Roles

In this chapter, we will cover the following topics:

Managing SELinux users
Mapping Linux users to SELinux users
Running commands in a specified role with sudo
Running commands in a specified role with runcon
Switching roles
Creating a new role
Initial role based on entry
Defining role transitions
Looking into access privileges

SELinux Cookbook

By : Sven Vermeulen

SELinux Cookbook

By: Sven Vermeulen

Overview of this book

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Current Title:

SELinux Cookbook

Chapter 6. Setting Up Separate Roles