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by Robert G. Byrnes, Richard E. Silverman, Daniel J. Barrett
Linux Security Cookbook
Linux Security Cookbook
Preface
A Cookbook About Security?!?
Intended Audience
Roadmap of the Book
Our Security Philosophy
Supported Linux Distributions
Trying the Recipes
Conventions Used in This Book
We’d Like to Hear from You
Acknowledgments
1. System Snapshots with Tripwire
1.1. Setting Up Tripwire
1.1.1. Problem
1.1.2. Solution
1.1.3. Discussion
1.1.4. See Also
1.2. Displaying the Policy and Configuration
1.2.1. Problem
1.2.2. Solution
1.2.3. Discussion
1.2.4. See Also
1.3. Modifying the Policy and Configuration
1.3.1. Problem
1.3.2. Solution
1.3.3. Discussion
1.3.4. See Also
1.4. Basic Integrity Checking
1.4.1. Problem
1.4.2. Solution
1.4.3. Discussion
1.4.4. See Also
1.5. Read-Only Integrity Checking
1.5.1. Problem
1.5.2. Solution
1.5.3. Discussion
1.5.4. See Also
1.6. Remote Integrity Checking
1.6.1. Problem
1.6.2. Solution
1.6.3. Discussion
1.6.4. See Also
1.7. Ultra-Paranoid Integrity Checking
1.7.1. Problem
1.7.2. Solution
1.7.3. Discussion
1.7.4. See Also
1.8. Expensive, Ultra-Paranoid Security Checking
1.8.1. Problem
1.8.2. Solution
1.8.3. Discussion
1.9. Automated Integrity Checking
1.9.1. Problem
1.9.2. Solution
1.9.3. Discussion
1.9.4. See Also
1.10. Printing the Latest Tripwire Report
1.10.1. Problem
1.10.2. Solution
1.10.3. Discussion
1.10.4. See Also
1.11. Updating the Database
1.11.1. Problem
1.11.2. Solution
1.11.3. Discussion
1.11.4. See Also
1.12. Adding Files to the Database
1.12.1. Problem
1.12.2. Solution
1.12.3. Discussion
1.12.4. See Also
1.13. Excluding Files from the Database
1.13.1. Problem
1.13.2. Solution
1.13.3. Discussion
1.13.4. See Also
1.14. Checking Windows VFAT Filesystems
1.14.1. Problem
1.14.2. Solution
1.14.3. Discussion
1.14.4. See Also
1.15. Verifying RPM-Installed Files
1.15.1. Problem
1.15.2. Solution
1.15.3. Discussion
1.15.4. See Also
1.16. Integrity Checking with rsync
1.16.1. Problem
1.16.2. Solution
1.16.3. Discussion
1.16.4. See Also
1.17. Integrity Checking Manually
1.17.1. Problem
1.17.2. Solution
1.17.3. Discussion
1.17.4. See Also
2. Firewalls with iptables and ipchains
2.1. Enabling Source Address Verification
2.1.1. Problem
2.1.2. Solution
2.1.3. Discussion
2.1.4. See Also
2.2. Blocking Spoofed Addresses
2.2.1. Problem
2.2.2. Solution
2.2.3. Discussion
2.2.4. See Also
2.3. Blocking All Network Traffic
2.3.1. Problem
2.3.2. Solution
2.3.3. Discussion
2.3.4. See Also
2.4. Blocking Incoming Traffic
2.4.1. Problem
2.4.2. Solution
2.4.3. Discussion
2.4.4. See Also
2.5. Blocking Outgoing Traffic
2.5.1. Problem
2.5.2. Solution
2.5.3. Discussion
2.5.4. See Also
2.6. Blocking Incoming Service Requests
2.6.1. Problem
2.6.2. Solution
2.6.3. Discussion
2.6.4. See Also
2.7. Blocking Access from a Remote Host
2.7.1. Problem
2.7.2. Solution
2.7.3. Discussion
2.7.4. See Also
2.8. Blocking Access to a Remote Host
2.8.1. Problem
2.8.2. Solution
2.8.3. Discussion
2.8.4. See Also
2.9. Blocking Outgoing Access to All Web Servers on a Network
2.9.1. Problem
2.9.2. Solution
2.9.3. Discussion
2.9.4. See Also
2.10. Blocking Remote Access, but Permitting Local
2.10.1. Problem
2.10.2. Solution
2.10.3. Discussion
2.10.4. See Also
2.11. Controlling Access by MAC Address
2.11.1. Problem
2.11.2. Solution
2.11.3. Discussion
2.11.4. See Also
2.12. Permitting SSH Access Only
2.12.1. Problem
2.12.2. Solution
2.12.3. Discussion
2.12.4. See Also
2.13. Prohibiting Outgoing Telnet Connections
2.13.1. Problem
2.13.2. Solution
2.13.3. Discussion
2.13.4. See Also
2.14. Protecting a Dedicated Server
2.14.1. Problem
2.14.2. Solution
2.14.3. Discussion
2.14.4. See Also
2.15. Preventing pings
2.15.1. Problem
2.15.2. Solution
2.15.3. Discussion
2.15.4. See Also
2.16. Listing Your Firewall Rules
2.16.1. Problem
2.16.2. Solution
2.16.3. Discussion
2.16.4. See Also
2.17. Deleting Firewall Rules
2.17.1. Problem
2.17.2. Solution
2.17.3. Discussion
2.17.4. See Also
2.18. Inserting Firewall Rules
2.18.1. Problem
2.18.2. Solution
2.18.3. Discussion
2.18.4. See Also
2.19. Saving a Firewall Configuration
2.19.1. Problem
2.19.2. Solution
2.19.3. Discussion
2.19.4. See Also
2.20. Loading a Firewall Configuration
2.20.1. Problem
2.20.2. Solution
2.20.3. Discussion
2.20.4. See Also
2.21. Testing a Firewall Configuration
2.21.1. Problem
2.21.2. Solution
2.21.3. Discussion
2.21.4. See Also
2.22. Building Complex Rule Trees
2.22.1. Problem
2.22.2. Solution
2.22.3. Discussion
2.22.4. See Also
2.23. Logging Simplified
2.23.1. Problem
2.23.2. Solution
2.23.3. Discussion
2.23.4. See Also
3. Network Access Control
3.1. Listing Your Network Interfaces
3.1.1. Problem
3.1.2. Solution
3.1.3. Discussion
3.1.4. See Also
3.2. Starting and Stopping the Network Interface
3.2.1. Problem
3.2.2. Solution
3.2.3. Discussion
3.2.4. See Also
3.3. Enabling/Disabling a Service (xinetd)
3.3.1. Problem
3.3.2. Solution
3.3.3. Discussion
3.3.4. See Also
3.4. Enabling/Disabling a Service (inetd)
3.4.1. Problem
3.4.2. Solution
3.4.3. Discussion
3.4.4. See Also
3.5. Adding a New Service (xinetd)
3.5.1. Problem
3.5.2. Solution
3.5.3. Discussion
3.5.4. See Also
3.6. Adding a New Service (inetd)
3.6.1. Problem
3.6.2. Solution
3.6.3. Discussion
3.6.4. See Also
3.7. Restricting Access by Remote Users
3.7.1. Problem
3.7.2. Solution
3.7.3. Discussion
3.7.4. See Also
3.8. Restricting Access by Remote Hosts (xinetd)
3.8.1. Problem
3.8.2. Solution
3.8.3. Discussion
3.8.4. See Also
3.9. Restricting Access by Remote Hosts (xinetd with libwrap)
3.9.1. Problem
3.9.2. Solution
3.9.3. Discussion
3.9.4. See Also
3.10. Restricting Access by Remote Hosts (xinetd with tcpd)
3.10.1. Problem
3.10.2. Solution
3.10.3. Discussion
3.10.4. See Also
3.11. Restricting Access by Remote Hosts (inetd)
3.11.1. Problem
3.11.2. Solution
3.11.3. Discussion
3.11.4. See Also
3.12. Restricting Access by Time of Day
3.12.1. Problem
3.12.2. Solution
3.12.3. Discussion
3.12.4. See Also
3.13. Restricting Access to an SSH Server by Host
3.13.1. Problem
3.13.2. Solution
3.13.3. Discussion
3.13.4. See Also
3.14. Restricting Access to an SSH Server by Account
3.14.1. Problem
3.14.2. Solution
3.14.3. Discussion
3.14.4. See Also
3.15. Restricting Services to Specific Filesystem Directories
3.15.1. Problem
3.15.2. Solution
3.15.3. Discussion
3.15.4. See Also
3.16. Preventing Denial of Service Attacks
3.16.1. Problem
3.16.2. Solution
3.16.3. Discussion
3.16.4. See Also
3.17. Redirecting to Another Socket
3.17.1. Problem
3.17.2. Solution
3.17.3. Discussion
3.17.4. See Also
3.18. Logging Access to Your Services
3.18.1. Problem
3.18.2. Solution
3.18.3. Discussion
3.18.4. See Also
3.19. Prohibiting root Logins on Terminal Devices
3.19.1. Problem
3.19.2. Solution
3.19.3. Discussion
3.19.4. See Also
4. Authentication Techniques and Infrastructures
4.1. Creating a PAM-Aware Application
4.1.1. Problem
4.1.2. Solution
4.1.3. Discussion
4.1.4. See Also
4.2. Enforcing Password Strength with PAM
4.2.1. Problem
4.2.2. Solution
4.2.3. Discussion
4.2.4. See Also
4.3. Creating Access Control Lists with PAM
4.3.1. Problem
4.3.2. Solution
4.3.3. Discussion
4.3.4. See Also
4.4. Validating an SSL Certificate
4.4.1. Problem
4.4.2. Solution
4.4.3. Discussion
4.4.4. See Also
4.5. Decoding an SSL Certificate
4.5.1. Problem
4.5.2. Solution
4.5.3. Discussion
4.5.4. See Also
4.6. Installing a New SSL Certificate
4.6.1. Problem
4.6.2. Solution
4.6.3. Discussion
4.6.4. See Also
4.7. Generating an SSL Certificate Signing Request (CSR)
4.7.1. Problem
4.7.2. Solution
4.7.3. Discussion
4.7.4. See Also
4.8. Creating a Self-Signed SSL Certificate
4.8.1. Problem
4.8.2. Solution
4.8.3. Discussion
4.8.4. See Also
4.9. Setting Up a Certifying Authority
4.9.1. Problem
4.9.2. Solution
4.9.3. Discussion
4.9.4. See Also
4.10. Converting SSL Certificates from DER to PEM
4.10.1. Problem
4.10.2. Solution
4.10.3. Discussion
4.10.4. See Also
4.11. Getting Started with Kerberos
4.11.1. Problem
4.11.2. Solution
4.11.3. Discussion
4.11.4. See Also
4.12. Adding Users to a Kerberos Realm
4.12.1. Problem
4.12.2. Solution
4.12.3. Discussion
4.12.4. See Also
4.13. Adding Hosts to a Kerberos Realm
4.13.1. Problem
4.13.2. Solution
4.13.3. Discussion
4.13.4. See Also
4.14. Using Kerberos with SSH
4.14.1. Problem
4.14.2. Solution
4.14.3. Discussion
4.14.4. See Also
4.15. Using Kerberos with Telnet
4.15.1. Problem
4.15.2. Solution
4.15.3. Discussion
4.15.4. See Also
4.16. Securing IMAP with Kerberos
4.16.1. Problem
4.16.2. Solution
4.16.3. Discussion
4.16.4. See Also
4.17. Using Kerberos with PAM for System-Wide Authentication
4.17.1. Problem
4.17.2. Solution
4.17.3. Discussion
4.17.4. See Also
5. Authorization Controls
5.1. Running a root Login Shell
5.1.1. Problem
5.1.2. Solution
5.1.3. Discussion
5.1.4. See Also
5.2. Running X Programs as root
5.2.1. Problem
5.2.2. Solution
5.2.3. Discussion
5.2.4. See Also
5.3. Running Commands as Another User via sudo
5.3.1. Problem
5.3.2. Solution
5.3.3. Discussion
5.3.4. See Also
5.4. Bypassing Password Authentication in sudo
5.4.1. Problem
5.4.2. Solution
5.4.3. Discussion
5.4.4. See Also
5.5. Forcing Password Authentication in sudo
5.5.1. Problem
5.5.2. Solution
5.5.3. Discussion
5.5.4. See Also
5.6. Authorizing per Host in sudo
5.6.1. Problem
5.6.2. Solution
5.6.3. Discussion
5.6.4. See Also
5.7. Granting Privileges to a Group via sudo
5.7.1. Problem
5.7.2. Solution
5.7.3. See Also
5.8. Running Any Program in a Directory via sudo
5.8.1. Problem
5.8.2. Solution
5.8.3. See Also
5.9. Prohibiting Command Arguments with sudo
5.9.1. Problem
5.9.2. Solution
5.9.3. Discussion
5.9.4. See Also
5.10. Sharing Files Using Groups
5.10.1. Problem
5.10.2. Solution
5.10.3. Discussion
5.10.4. See Also
5.11. Permitting Read-Only Access to a Shared File via sudo
5.11.1. Problem
5.11.2. Solution
5.11.3. Discussion
5.11.4. See Also
5.12. Authorizing Password Changes via sudo
5.12.1. Problem
5.12.2. Solution
5.12.3. Discussion
5.12.4. See Also
5.13. Starting/Stopping Daemons via sudo
5.13.1. Problem
5.13.2. Solution
5.13.3. Discussion
5.13.4. See Also
5.14. Restricting root’s Abilities via sudo
5.14.1. Problem
5.14.2. Solution
5.14.3. Discussion
5.14.4. See Also
5.15. Killing Processes via sudo
5.15.1. Problem
5.15.2. Solution
5.15.3. Discussion
5.15.4. See Also
5.16. Listing sudo Invocations
5.16.1. Problem
5.16.2. Solution
5.16.3. Discussion
5.16.4. See Also
5.17. Logging sudo Remotely
5.17.1. Problem
5.17.2. Solution
5.17.3. Discussion
5.17.4. See Also
5.18. Sharing root Privileges via SSH
5.18.1. Problem
5.18.2. Solution
5.18.3. Discussion
5.18.4. See Also
5.19. Running root Commands via SSH
5.19.1. Problem
5.19.2. Solution
5.19.3. Discussion
5.19.4. See Also
5.20. Sharing root Privileges via Kerberos su
5.20.1. Problem
5.20.2. Solution
5.20.3. Discussion
5.20.3.1. Authentication
5.20.3.2. Authorization
5.20.4. See Also
6. Protecting Outgoing Network Connections
6.1. Logging into a Remote Host
6.1.1. Problem
6.1.2. Solution
6.1.3. Discussion
6.1.4. See Also
6.2. Invoking Remote Programs
6.2.1. Problem
6.2.2. Solution
6.2.3. Discussion
6.2.4. See Also
6.3. Copying Files Remotely
6.3.1. Problem
6.3.2. Solution
6.3.3. Discussion
6.3.4. See Also
6.4. Authenticating by Public Key (OpenSSH)
6.4.1. Problem
6.4.2. Solution
6.4.3. Discussion
6.4.4. See Also
6.5. Authenticating by Public Key (OpenSSH Client, SSH2 Server, OpenSSH Key)
6.5.1. Problem
6.5.2. Solution
6.5.3. Discussion
6.5.4. See Also
6.6. Authenticating by Public Key (OpenSSH Client, SSH2 Server, SSH2 Key)
6.6.1. Problem
6.6.2. Solution
6.6.3. Discussion
6.6.4. See Also
6.7. Authenticating by Public Key (SSH2 Client, OpenSSH Server)
6.7.1. Problem
6.7.2. Solution
6.7.3. Description
6.7.4. See Also
6.8. Authenticating by Trusted Host
6.8.1. Problem
6.8.2. Solution
6.8.3. Discussion
6.8.4. See Also
6.9. Authenticating Without a Password (Interactively)
6.9.1. Problem
6.9.2. Solution
6.9.3. Discussion
6.9.4. See Also
6.10. Authenticating in cron Jobs
6.10.1. Problem
6.10.2. Solution
6.10.3. Discussion
6.10.4. See Also
6.11. Terminating an SSH Agent on Logout
6.11.1. Problem
6.11.2. Solution
6.11.3. Discussion
6.11.4. See Also
6.12. Tailoring SSH per Host
6.12.1. Problem
6.12.2. Solution
6.12.3. Discussion
6.12.4. See Also
6.13. Changing SSH Client Defaults
6.13.1. Problem
6.13.2. Solution
6.13.3. Discussion
6.13.4. See Also
6.14. Tunneling Another TCP Session Through SSH
6.14.1. Problem
6.14.2. Solution
6.14.3. Discussion
6.14.4. See Also
6.15. Keeping Track of Passwords
6.15.1. Problem
6.15.2. Solution
6.15.3. Discussion
6.15.4. See Also
7. Protecting Files
7.1. Using File Permissions
7.1.1. Problem
7.1.2. Solution
7.1.3. Discussion
7.1.4. See Also
7.2. Securing a Shared Directory
7.2.1. Problem
7.2.2. Solution
7.2.3. Discussion
7.2.4. See Also
7.3. Prohibiting Directory Listings
7.3.1. Problem
7.3.2. Solution
7.3.3. Discussion
7.3.4. See Also
7.4. Encrypting Files with a Password
7.4.1. Problem
7.4.2. Solution
7.4.3. Discussion
7.4.4. See Also
7.5. Decrypting Files
7.5.1. Problem
7.5.2. Solution
7.5.3. Discussion
7.5.4. See Also
7.6. Setting Up GnuPG for Public-Key Encryption
7.6.1. Problem
7.6.2. Solution
7.6.3. Discussion
7.6.4. See Also
7.7. Listing Your Keyring
7.7.1. Problem
7.7.2. Solution
7.7.3. Discussion
7.7.4. See Also
7.8. Setting a Default Key
7.8.1. Problem
7.8.2. Solution
7.8.3. Discussion
7.8.4. See Also
7.9. Sharing Public Keys
7.9.1. Problem
7.9.2. Solution
7.9.3. Discussion
7.9.4. See Also
7.10. Adding Keys to Your Keyring
7.10.1. Problem
7.10.2. Solution
7.10.3. Discussion
7.10.4. See Also
7.11. Encrypting Files for Others
7.11.1. Problem
7.11.2. Solution
7.11.3. Discussion
7.11.4. See Also
7.12. Signing a Text File
7.12.1. Problem
7.12.2. Solution
7.12.3. Discussion
7.12.4. See Also
7.13. Signing and Encrypting Files
7.13.1. Problem
7.13.2. Solution
7.13.3. Discussion
7.13.4. See Also
7.14. Creating a Detached Signature File
7.14.1. Problem
7.14.2. Solution
7.14.3. Discussion
7.14.4. See Also
7.15. Checking a Signature
7.15.1. Problem
7.15.2. Solution
7.15.3. Discussion
7.15.4. See Also
7.16. Printing Public Keys
7.16.1. Problem
7.16.2. Solution
7.16.3. Discussion
7.16.4. See Also
7.17. Backing Up a Private Key
7.17.1. Problem
7.17.2. Solution
7.17.3. Discussion
7.17.4. See Also
7.18. Encrypting Directories
7.18.1. Problem
7.18.2. Solution
7.18.3. Discussion
7.18.4. See Also
7.19. Adding Your Key to a Keyserver
7.19.1. Problem
7.19.2. Solution
7.19.3. Discussion
7.19.4. See Also
7.20. Uploading New Signatures to a Keyserver
7.20.1. Problem
7.20.2. Solution
7.21. Obtaining Keys from a Keyserver
7.21.1. Problem
7.21.2. Solution
7.21.3. Discussion
7.21.4. See Also
7.22. Revoking a Key
7.22.1. Problem
7.22.2. Solution
7.22.3. Discussion
7.22.4. See Also
7.23. Maintaining Encrypted Files with Emacs
7.23.1. Problem
7.23.2. Solution
7.23.3. Discussion
7.23.4. See Also
7.24. Maintaining Encrypted Files with vim
7.24.1. Problem
7.24.2. Solution
7.24.3. Discussion
7.24.4. See Also
7.25. Encrypting Backups
7.25.1. Problem
7.25.2. Solution
7.25.3. Discussion
7.25.4. See Also
7.26. Using PGP Keys with GnuPG
7.26.1. Problem
7.26.2. Solution
7.26.3. Discussion
7.26.4. See Also
8. Protecting Email
8.1. Encrypted Mail with Emacs
8.1.1. Problem
8.1.2. Solution
8.1.3. Discussion
8.1.4. See Also
8.2. Encrypted Mail with vim
8.2.1. Problem
8.2.2. Solution
8.2.3. Discussion
8.2.4. See Also
8.3. Encrypted Mail with Pine
8.3.1. Problem
8.3.2. Solution
8.3.3. Description
8.3.4. See Also
8.4. Encrypted Mail with Mozilla
8.4.1. Problem
8.4.2. Solution
8.4.3. Discussion
8.4.4. See Also
8.5. Encrypted Mail with Evolution
8.5.1. Problem
8.5.2. Solution
8.5.3. Discussion
8.5.4. See Also
8.6. Encrypted Mail with mutt
8.6.1. Problem
8.6.2. Solution
8.6.3. Discussion
8.6.4. See Also
8.7. Encrypted Mail with elm
8.7.1. Problem
8.7.2. Solution
8.7.3. Discussion
8.7.4. See Also
8.8. Encrypted Mail with MH
8.8.1. Problem
8.8.2. Solution
8.8.3. Discussion
8.8.4. See Also
8.9. Running a POP/IMAP Mail Server with SSL
8.9.1. Problem
8.9.2. Solution
8.9.3. Discussion
8.9.4. See Also
8.10. Testing an SSL Mail Connection
8.10.1. Problem
8.10.2. Solution
8.10.3. Discussion
8.10.4. See Also
8.11. Securing POP/IMAP with SSL and Pine
8.11.1. Problem
8.11.2. Solution
8.11.3. Discussion
8.11.4. See Also
8.12. Securing POP/IMAP with SSL and mutt
8.12.1. Problem
8.12.2. Solution
8.12.3. Discussion
8.12.4. See Also
8.13. Securing POP/IMAP with SSL and Evolution
8.13.1. Problem
8.13.2. Solution
8.13.3. Discussion
8.13.4. See Also
8.14. Securing POP/IMAP with stunnel and SSL
8.14.1. Problem
8.14.2. Solution
8.14.3. Discussion
8.14.4. See Also
8.15. Securing POP/IMAP with SSH
8.15.1. Problem
8.15.2. Solution
8.15.3. Discussion
8.15.4. See Also
8.16. Securing POP/IMAP with SSH and Pine
8.16.1. Problem
8.16.2. Solution
8.16.3. Discussion
8.16.4. See Also
8.17. Receiving Mail Without a Visible Server
8.17.1. Problem
8.17.2. Solution
8.17.3. Discussion
8.17.4. See Also
8.18. Using an SMTP Server from Arbitrary Clients
8.18.1. Problem
8.18.2. Solution
8.18.3. Discussion
8.18.4. See Also
9. Testing and Monitoring
9.1. Testing Login Passwords (John the Ripper)
9.1.1. Problem
9.1.2. Solution
9.1.3. Discussion
9.1.4. See Also
9.2. Testing Login Passwords (CrackLib)
9.2.1. Problem
9.2.2. Solution
9.2.3. Discussion
9.2.4. See Also
9.3. Finding Accounts with No Password
9.3.1. Problem
9.3.2. Solution
9.3.3. Discussion
9.3.4. See Also
9.4. Finding Superuser Accounts
9.4.1. Problem
9.4.2. Solution
9.4.3. Discussion
9.4.4. See Also
9.5. Checking for Suspicious Account Use
9.5.1. Problem
9.5.2. Solution
9.5.3. Discussion
9.5.4. See Also
9.6. Checking for Suspicious Account Use, Multiple Systems
9.6.1. Problem
9.6.2. Solution
9.6.3. Discussion
9.6.4. See Also
9.7. Testing Your Search Path
9.7.1. Problem
9.7.2. Solution
9.7.3. Discussion
9.7.4. See Also
9.8. Searching Filesystems Effectively
9.8.1. Problem
9.8.2. Solution
9.8.3. Discussion
9.8.4. See Also
9.9. Finding setuid (or setgid) Programs
9.9.1. Problem
9.9.2. Solution
9.9.3. Discussion
9.9.4. See Also
9.10. Securing Device Special Files
9.10.1. Problem
9.10.2. Solution
9.10.3. Discussion
9.10.4. See Also
9.11. Finding Writable Files
9.11.1. Problem
9.11.2. Solution
9.11.3. Discussion
9.11.4. See Also
9.12. Looking for Rootkits
9.12.1. Problem
9.12.2. Solution
9.12.3. Discussion
9.12.4. See Also
9.13. Testing for Open Ports
9.13.1. Problem
9.13.2. Solution
9.13.3. Discussion
9.13.4. See Also
9.14. Examining Local Network Activities
9.14.1. Problem
9.14.2. Solution
9.14.3. Discussion
9.14.4. See Also
9.15. Tracing Processes
9.15.1. Problem
9.15.2. Solution
9.15.3. Discussion
9.15.4. See Also
9.16. Observing Network Traffic
9.16.1. Problem
9.16.2. Solution
9.16.3. Discussion
9.16.4. See Also
9.17. Observing Network Traffic (GUI)
9.17.1. Problem
9.17.2. Solution
9.17.3. Discussion
9.17.4. See Also
9.18. Searching for Strings in Network Traffic
9.18.1. Problem
9.18.2. Solution
9.18.3. Discussion
9.18.4. See Also
9.19. Detecting Insecure Network Protocols
9.19.1. Problem
9.19.2. Solution
9.19.3. Discussion
9.19.4. See Also
9.20. Getting Started with Snort
9.20.1. Problem
9.20.2. Solution
9.20.3. Discussion
9.20.4. See Also
9.21. Packet Sniffing with Snort
9.21.1. Problem
9.21.2. Solution
9.21.3. Discussion
9.21.4. See Also
9.22. Detecting Intrusions with Snort
9.22.1. Problem
9.22.2. Solution
9.22.3. Discussion
9.22.4. See Also
9.23. Decoding Snort Alert Messages
9.23.1. Problem
9.23.2. Solution
9.23.3. Discussion
9.23.4. See Also
9.24. Logging with Snort
9.24.1. Problem
9.24.2. Solution
9.24.3. Discussion
9.24.4. See Also
9.25. Partitioning Snort Logs Into Separate Files
9.25.1. Problem
9.25.2. Solution
9.25.3. Discussion
9.25.4. See Also
9.26. Upgrading and Tuning Snort’s Ruleset
9.26.1. Problem
9.26.2. Solution
9.26.3. Discussion
9.26.4. See Also
9.27. Directing System Messages to Log Files (syslog)
9.27.1. Problem
9.27.2. Solution
9.27.3. Discussion
9.27.4. See Also
9.28. Testing a syslog Configuration
9.28.1. Problem
9.28.2. Solution
9.28.3. Discussion
9.28.4. See Also
9.29. Logging Remotely
9.29.1. Problem
9.29.2. Solution
9.29.3. Discussion
9.29.4. See Also
9.30. Rotating Log Files
9.30.1. Problem
9.30.2. Solution
9.30.3. Discussion
9.30.4. See Also
9.31. Sending Messages to the System Logger
9.31.1. Problem
9.31.2. Solution
9.31.3. Discussion
9.31.4. See Also
9.32. Writing Log Entries via Shell Scripts
9.32.1. Problem
9.32.2. Solution
9.32.3. Discussion
9.32.4. See Also
9.33. Writing Log Entries via Perl
9.33.1. Problem
9.33.2. Solution
9.33.3. Discussion
9.33.4. See Also
9.34. Writing Log Entries via C
9.34.1. Problem
9.34.2. Solution
9.34.3. Discussion
9.34.4. See Also
9.35. Combining Log Files
9.35.1. Problem
9.35.2. Solution
9.35.3. Discussion
9.35.4. See Also
9.36. Summarizing Your Logs with logwatch
9.36.1. Problem
9.36.2. Solution
9.36.3. Discussion
9.36.4. See Also
9.37. Defining a logwatch Filter
9.37.1. Problem
9.37.2. Solution
9.37.3. Discussion
9.37.4. See Also
9.38. Monitoring All Executed Commands
9.38.1. Problem
9.38.2. Solution
9.38.3. Discussion
9.38.4. See Also
9.39. Displaying All Executed Commands
9.39.1. Problem
9.39.2. Solution
9.39.3. Discussion
9.39.4. See Also
9.40. Parsing the Process Accounting Log
9.40.1. Problem
9.40.2. Solution
9.40.3. Discussion
9.40.4. See Also
9.41. Recovering from a Hack
9.41.1. Problem
9.41.2. Solution
9.41.3. Discussion
9.41.4. See Also
9.42. Filing an Incident Report
9.42.1. Problem
9.42.2. Solution
9.42.3. Discussion
9.42.4. See Also
Index
About the Authors
Colophon
Copyright
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