LinuxCBT SELinux Edition is unparalleled in content, depth and expertise. It entails 11-hours, or over 1-day of classroom training. LinuxCBT SELinux Edition prepares you or your organization for successfully securing GNU/Linux & Open Source-based solutions. As a by-product, many of the covered concepts, utilities and tricks are applicable to heterogeneous computing environments, ensuring your coverage of the fundamentals of securing corporate infrastructures.

Let LinuxCBT SELinux Edition cost-effectively sharpen your GNU/Linux & Open Source Security skills!

Recommended Prerequisites for:

• Any LinuxCBT Operating System Course (Classic/EL-4|5/SUSE/Debian Editions)
  • Open mind & determination to master Linux and related open-source applications
  • Basic understanding of networking concepts
  • Access to a PC to follow the exercises

SELinux Security - Module IV

• Access Control Models
  • Describe Access Control Model (ACM) theories (DAC/MAC/nDAC)
  • Explain features & shortcomings of Discretionary Access Control (DAC) models
  • Identify key DAC-based utilities
  • Discuss the advantages & caveats of Mandatory Access Control (MAC)models
  • Explore DAC-based programs
• SELinux - Basics
  • Discuss subjects & objects
  • Explain how SELinux is implemented in 2.6.x-based kernels
  • Confirm SELinux support in the kernel
  • Identify key SELinux packages
  • Use sestatus to obtain the current SELinux mode
  • Discuss subject & object labeling
  • Describe the 3 SELinux operating modes
  • Identify key utilities & files, which dictate the current SELinux operating mode
  • Focus on the features of SELinux permissive mode
  • Explore the boot process as it relates to SELinux
• SELinux - Object Labeling
  • Discuss subject & object labeling
  • Discuss the role of extended attributes (XATTRs)
  • Expose the labels of specific objects
  • Alter the lables of specific objects
  • Configure SELinux to automatically label objects per security policy
  • Reset the system and confirm labels on altered objects
  • Explain security tuples
  • Use fixfiles to restore object labels on running system per security policy
• SELinux - Type Contexts - Security Labels Applied to Objects
  • Intro to object security tuples - security labels
  • Attempt to serve HTML content using Apache in SELinux enforcing mode
  • Identify problematic object security labels
  • Serve HTML content in SELinux permissive mode
  • Use chcon to alter object security labels
  • Switch to enforcing mode & confirm the ability to serve HTML content
  • Use restorecon to restore object security context (labels)
• SELinux - Basic Commands - Type & Domain Exposition
  • ps - reveal subjects' security context (security label) - Domains
  • ls - reveal objects' security label - Types
  • cp - preserve/inherit security labels
  • mv - preserve security labels
  • id - expose subject security label
• SELinux - Targeted Policy - Binary
  • Explain the Targeted Policy's features
  • Discuss policy transitions for domains
  • Compare & contrast confined & unconfined states
  • Exempt Apache daemon from the auspicies of the targeted policy's confined state
  • Evaluate results after exemption
  • Explain the security contexts applied to subjects & objects
  • Peruse key targeted binary policy files
  • Identify the daemons protected by the targeted policy
  • Discuss the unconfined_t domain - subject label
• SELinux - Targeted Policy - Source
  • Install the targeted policy source files
  • Identify & discuss TE and FC files
  • Explore file_contexts - context definition for objects
  • Discuss the file context syntax
  • Explain the purpose of using run_init to initiate SELinux-protected daemons
  • Switch between permissive & enforcing modes and evaluate behavior
  • Peruse the key files in the targeted source policy
• SELinux - Miscellaneous Utilities - Logging
  • Use tar to archive SELinux-protected objects
  • Confirm security labels on tar-archived objects
  • Use the tar substitute 'star' to archive extended attributes(XATTRs)
  • Confirm security labels on star-archived objects
  • Discuss the role of the AVC
  • Examine SELinux logs - /var/log/messages
  • Alter Syslog configuration to route SELinux messages to an ideal location
  • Use SETools, shell-based programs to output real-time statistics
  • Install & use SEAudit graphical SELinux log-management tool
• SELinux - RedHat® Enterprise 5.x - Exploration
  • Explore configuration & key utilities
  • Transition from 'disabled' to 'permissive' mode
  • Focus on Apache web server behavior
  • Enable UserDir functionality & test content access
  • Transition to 'enforcing' mode
  • Examine Apache behvavior in restricted environment
  • Adjust SELinux directives
  • Evaluate results
• SELinux - Network Ports - Service Restrictions
  • Explore standard behavior
  • Configure new application bindings
  • Examine SELinux intervention
  • Rectify SELinux configuration for multiple services
  • Evaluate results

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