book

SELinux Cookbook

by Sven Vermeulen

September 2014

Intermediate to advanced

240 pages

5h 53m

English

Packt Publishing

Read now

Unlock full access

Support files, eBooks, discount offers, and moreWhy subscribe?Free access for Packt account holders
What this book covers

Downloading the example codeErrataPiracyQuestions
IntroductionAbout SELinuxThe role of the SELinux policyThe example
Getting readyHow to do it…How it works…There's more...See also
Getting readyHow to do it…How it works…The policy source fileThe binary policy moduleLoading a policy into the policy storeThere's more...See also
How to do it…How it works…See also
How to do it…How it works…The location of the interface definitionsThe in-line documentationSee also
Getting readyHow to do it…How it works…There's more...
How to do it…How it works…Changes in interfacesKernel version changesMLS or not
Introduction
How to do it…How it works…Path expressionsThe order of processingClass identifiersContext declarationThere's more...
Getting readyHow to do it…How it works…There's more...See also
Getting readyHow to do it…How it works…Finding the right search patternPatternsThere's more...See also
How to do it…How it works…Full policy replacementRanged daemon domainConstraintsSee also
Getting readyHow to do it…How it works…The mcstrans and setrans.conf filesSELinux users and Linux user mappingsRunning Apache with the right contextSee also
Introduction
How to do it…How it works...See also
Getting readyHow to do it…How it works...There's more...See also
How to do it…How it worksThere's more...
How to do it…How it works...There's more...See also
Getting readyHow to do it…How it works...There's more...
How to do it…How it works...
How to do it…How it works...See also
How to do it…How it works...There's more...
How to do it…How it works...
How to do it…How it works...There's more...See also
How to do it…How it works...See also
Introduction
How to do it…How it works…Files and directoriesNetwork resourcesProcessesHardware and kernel resources
How to do it…How it works…Type declarationsManaging files and directoriesX11 and shared memoryThe network accessThere's more...See also
How to do it…How it works…
How to do it…How it works…There's more...
How to do it…How it works…
How to do it…How it works…
How to do it…How it works…
How to do it…How it works…There's more...
How to do it…How it works…There's more...
Introduction
How to do it…How it works…Online researchSandbox environmentThe structural documentationSee also
How to do it…How it works…Domain definitionsLogical resourcesInfrastructural resources
How to do it…How it works…
How to do it…How it works…
How to do it…How it works…See also
How to do it…For a Unix domain socket with a socket fileFor an abstract Unix domain socketHow it works…
How to do it…How it works…See also
Introduction
How to do it…How it works…There's more...
How to do it…How it works…
How to do it…How it works…See also
How to do it…How it works…
How to do it…How it works…
How to do it…How it works…Defining a role in the policyExtending the role privilegesDefault types and default contexts
How to do it…How it works…
How to do it…How it works…
How to do it…How it works…Direct access inspectionPolicy manipulationIndirect access
Introduction
How to do it…How it works…Shared file locationsUser content and customizable typesThere's more...
How to do it…How it works…
How to do it…How it works…
How to do it…How it works…
How to do it…How it works…
How to do it…How it works…
How to do it…How it works…Reducing exploit risksRole managementType inheritance and transitions
Introduction
How to do it…How it works…See also
Getting readyHow to do it…How it works…Invalid contextsDenied transition validationDenied security-bounded transitionsThere's more...See also
How to do it…How it works…
How to do it…How it works…See also
How to do it…How it works…
How to do it…How it works…
How to do it…How it works…There's more...See also
How to do it…How it works…There's more...See also
Introduction
Getting readyHow to do it…How it works…There's more...See also
How to do it…How it works…See also
How to do it…How it works…There's more...
How to do it…How it works…There's more...
How to do it…How it works…See also
How to do it…How it works…
How to do it…How it works…
How to do it…How it works…See also
Introduction
Getting readyHow to do it…How it works…There's more...
How to do it…How it works…There's more...
How to do it…How it works…
How to do it…How it works…There's more…
Getting readyHow to do it…How it works…There's more...
How to do it…How it works…There's more...
Getting readyHow to do it…How it works…There's more...
Getting readyHow to do it…How it works…There's more...
How to do it…How it works…There's more...

Content preview from SELinux Cookbook

Managing SELinux users

In order to grant a Linux login the right set of roles, we first need to create an SELinux user that has just those roles assigned. Existing SELinux users can be modified easily, and if an SELinux user was added previously, it can be removed from the system as well.

How to do it…

Managing SELinux users is done as follows:

Use semanage user to list the currently available SELinux users:

~# semanage user -l
                Labeling   MLS/       MLS/
SELinux User    Prefix     MCS Level  MCS Range                      SELinux Roles

git_shell_u     user       s0         s0                             git_shell_r
guest_u         user       s0         s0                             guest_r
root            user       s0         s0-s0:c0.c1023                 staff_r sysadm_r system_r unconfined_r
staff_u         user       s0         s0-s0:c0.c1023                 staff_r sysadm_r system_r unconfined_r
sysadm_u        user       s0         s0-s0:c0.c1023                 sysadm_r
system_u user ...