GL550: Enterprise Linux Security Administration

Mål

This highly technical course focuses on properly securing machines running the Linux operating systems. A broad range of general security techniques such as packet filtering, password policies, and file integrity checking are covered. Advanced security technologies such as Kerberos and SELinux are taught. Special attention is given to securing commonly deployed network services. At the end of the course, students have an excellent understanding of the potential security vulnerabilities -- know how to audit existing machines, and how to securely deploy new network services.

Förkunskaper

This class covers advanced security topics and is intended for experienced systems administrators. Candidates should have current Linux or UNIX systems administration experience equivalent to the GL120 Red Hat Enterprise Linux Fundamentals, GL250 Red Hat Enterprise Linux Systems Administration, and GL275 Red Hat Enterprise Linux Network Services.

This courses is currently supported on the latest releases of Red Hat Enterprise Linux, Fedora Core Linux or SUSE Linux Enterprise Server.

Security Foundations
Security Principles
Post-installation Hardening
Service Discovery, Minimization
Scanning and Mapping Vulnerabilities
Probing with DNS, SNMP, RPC, and NFS
Nessus Insecurity Scanner
Password Security and PAM

Secure Authentication with Kerberos
Secure Time Synchronization with NTP
ACLs for Secure NTP
Kerberos History, Implementations, and Concepts
Kerberos Principals, Safeguards, and Components
Authentication Process and Identification Types
KDC Server Daemons
Plan Topology and Implementation
Create KDC Databases and Administrators
Add Host Principals and Common Service Principals
Configure Slave KDC
Client PAM Configuration
Managing Keytabs
Principals and Managing Principals
MIT vs. Heimdal Principal Policy
Using Kerberized Services
Enabling Kerberized Services
OpenSSH and Kerberos

Securing the Filesystem
Filesystem Mount Options
NFS Properties and NFS Export Option
NFSv4 and GSSAPI Auth
Implementing NFSv4
File Encryption with GPG and OpenSSL
Encrypted Loopback FS
Using RPM as an IDS
TripWire History and Concepts
TripWire Installation, Policies, and Configuration TripWire Commands and General Operation

Securing Common Services
Secure CGI with Apache
Turning off Unneeded Modules
Configuration Delegation and Scope
ACL by IP Address
HTTP User Authentication
Standard Auth Modules
HTTP Digest Authentication
Authentication via SQL, LDAP, and Kerberos
Scrubbing HTTP Headers
Metering HTTP Bandwidth
PostgreSQL Overview and Default Configuration
SSL for PostgreSQL
Authentication Methods and Advanced Authentication
Ident-based Authentication
PostgreSQL Kerberos Authentication
Integrating Apache, PHP, and PostgreSQL Securely
SMTP Overview and Implementations
Selecting an MTA
Security Considerations
Postfix Overview
Chrooting Postfix
Connections and Relays
SMTP AUTH & StartTLS/SSL
Secure Cyrus IMAP Config
Using GSSAPI/Kerberos Authentication

SELinux
DAC vs. MAC Security
Shortcomings of Traditional UNIX Security
SELinux Goals, Terms, and Architecture
Activating and Interfacing with SELinux
SELinux commands and Roles
Understanding and Modifying Policy Source
File Context Files (*.fc)
Type Enforcement Files (*.te)
Using Booleans
Policy Analysis
Policy Customization