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14.2 Firewall or Packet Filtering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 375 14.2.1 Netfilter Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 376 14.2.2 Syntax of iptables and ip6tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 379 14.2.2.1 Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 379 14.2.2.2 Rules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 379 14.2.3 Creating Rules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 380 14.2.4 Installing the Rules at Each Boot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 381 14.3 Supervision: Prevention, Detection, Deterrence . . . . . . . . . . . . . . . . . . . . . . . . 382 14.3.1 Monitoring Logs with logcheck . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 382 14.3.2 Monitoring Activity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 383 14.3.2.1 In Real Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 383 14.3.2.2 History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 384 14.3.3 Detecting Changes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 384 14.3.3.1 Auditing Packages: debsums and its Limits . . . . . . . . . . . . . . . . . . . . . . . . . . . 385 14.3.3.2 Monitoring Files: AIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 386 14.3.4 Detecting Intrusion (IDS/NIDS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 387 14.4 Introduction to SELinux . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 388 14.4.1 Principles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 388 14.4.2 Seing Up SELinux . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 390 14.4.3 Managing an SELinux System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 391 14.4.3.1 Managing SELinux Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 392 14.4.3.2 Managing Identities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 392 14.4.3.3 Managing File Contexts, Ports and Booleans . . . . . . . . . . . . . . . . . . . . . . . . . . 393 14.4.4 Adapting the Rules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 394 14.4.4.1 Writing a .fc file . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 394 14.4.4.2 Writing a .if File . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 395 14.4.4.3 Writing a .te File . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 396 14.4.4.4 Compiling the Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 400 14.5 Other Security-Related Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 400 14.5.1 Inherent Risks of Web Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 400 14.5.2 Knowing What To Expect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 401 14.5.3 Choosing the Soware Wisely . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 402 14.5.4 Managing a Machine as a Whole . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 403 14.5.5 Users Are Players . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 403 14.5.6 Physical Security . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 404 14.5.7 Legal Liability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 404 14.6 Dealing with a Compromised Machine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 404 14.6.1 Detecting and Seeing the Cracker's Intrusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . 405 14.6.2 Puing the Server Off-Line . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 405 14.6.3 Keeping Everything that Could Be Used as Evidence . . . . . . . . . . . . . . . . . . . . . . . . 406 14.6.4 Re-installing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 406 14.6.5 Forensic Analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 407 14.6.6 Reconstituting the Aack Scenario . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 407 XII The Debian Administrator's Handbook
15. Creating a Debian Package 411 15.1 Rebuilding a Package from its Sources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 412 15.1.1 Geing the Sources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 412 15.1.2 Making Changes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 412 15.1.3 Starting the Rebuild . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 413 15.2 Building your First Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 415 15.2.1 Meta-Packages or Fake Packages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 415 15.2.2 Simple File Archive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 416 15.3 Creating a Package Repository for APT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 420 15.4 Becoming a Package Maintainer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 422 15.4.1 Learning to Make Packages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 422 15.4.1.1 Rules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 422 15.4.1.2 Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 423 15.4.1.3 Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 423 15.4.2 Acceptance Process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 424 15.4.2.1 Prerequisites . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 425 15.4.2.2 Registration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 425 15.4.2.3 Accepting the Principles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 426 15.4.2.4 Checking Skills . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 426 15.4.2.5 Final Approval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 427 16. Conclusion: Debian's Future 429 16.1 Upcoming Developments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 430 16.2 Debian's Future . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 430 16.3 Future of this Book . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 431 A. Derivative Distributions 433 A.1 Census and Cooperation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 433 A.2 Ubuntu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 433 A.3 Knoppix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 434 A.4 Linux Mint . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 435 A.5 SimplyME<strong>PI</strong>S . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 435 A.6 Aptosid (Formerly Sidux) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 435 A.7 Damn Small Linux . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 436 A.8 And Many More . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 436 B. Short Remedial Course 437 B.1 Shell and Basic Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 437 B.1.1 Browsing the Directory Tree and Managing Files . . . . . . . . . . . . . . . . . . . . . . . . . . 437 B.1.2 Displaying and Modifying Text Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 438 B.1.3 Searching for Files and within Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 439 B.1.4 Managing Processes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 439 B.1.5 System Information: Memory, Disk Space, Identity . . . . . . . . . . . . . . . . . . . . . . . . . 439 B.2 Organization of the Filesystem Hierarchy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 440 B.2.1 The Root Directory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 440 Contents XIII
Page 2 and 3: The Debian Administrator's Handbook
Page 4 and 5: 3.1.3 Integration with Other Linux/
Page 6 and 7: 6.5 Checking Package Authenticity .
Page 8 and 9: 9.4.1 Administrating On a Web Inter
Page 10 and 11: 11.5 Seing Up Windows Shares with S
Page 14 and 15: B.2.2 The User's Home Directory . .
Page 17 and 18: Foreword Linux has been garnering s
Page 19 and 20: Book Structure Following the struct
Page 21 and 22: While we were obviously satisfied w
Page 23 and 24: Tobias Gruetzmacher, Tournier Simon
Page 26 and 27: Keywords Objective Means Operation
Page 28 and 29: 1.1. What Is Debian? CULTURE Origin
Page 30 and 31: TOOL Installer debian-installer is
Page 32 and 33: COMMUNITY Upstream author, or Debia
Page 34 and 35: ➨ http://www.opensource.org/licen
Page 36 and 37: 1.3.1. The Debian Developers Debian
Page 38 and 39: with the changelog.gz file (or equi
Page 40 and 41: were only lile challenges at the be
Page 42 and 43: can always fine-tune these paramete
Page 44 and 45: PERSPECTIVE Debian for multimedia A
Page 46 and 47: Each specific service has its own s
Page 48 and 49: tool. Whether used in graphical or
Page 50 and 51: Figure 1.2 Compilation of a package
Page 52 and 53: their work. The next step is the in
Page 54 and 55: 28 The Debian Administrator's Handb
Page 56 and 57: Keywords Falcot Corp SMB Strong Gro
Page 58 and 59: We have envisioned this case study
Page 60 and 61: Several factors have dictated this
Page 62:
• A survey of several French serv
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Chapter Analyzing the Existing Setu
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Figure 3.1 Coexistence of Debian wi
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Figure 3.2 Database backups Each se
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HARDWARE Next-generation PC Most re
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Keywords Installation Partitioning
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BACK TO BASICS A catch-up course in
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copy the previously downloaded ISO
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of the two, and GRUB, a more modern
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Figure 4.3 Selecting the country 4.
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4.2.9. Configuring the Clock If the
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(swap) will be stored. This task is
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Figure 4.9 Guided partitioning The
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IN PRACTICE Shrinking a Windows par
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“Create a volume group”, to whi
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Figure 4.12 Selecting a Debian mirr
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accessible from the boot menu. You
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TIP Debian thinks of speakers of no
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Chapter Packaging System: Tools and
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Chapter 7, Solving Problems and Fin
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SHA1: 350a8a7a43fe182d54f3b7d73b803
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5.2.1.2. Conflicts: the Conflicts f
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Figure 5.1 Use of a Provides field
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name. This directory also includes
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postinst and similar scripts. But t
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-----BEGIN PGP SIGNED MESSAGE-----
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and a set of upstream patches contr
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Updating database of manual pages .
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which the file comes; --status pack
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Iceweasel is a redesign of the Mozi
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handles other packaging formats, es
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Chapter Maintenance and Updates: Th
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The syntax of the last field depend
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6.1.1.2. The Backports From backpor
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6.2.1. Initialization For any work
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6.2.3. System Upgrade Regular upgra
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it can be configured through severa
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TIP Comments in /etc/apt/ preferenc
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6.4. Frontends: aptitude, synaptic
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like aptitude has always done. It c
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aptitude's log will only contain a
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“Authentication” tab in the Sei
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compiled by the package maintainers
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Figure 6.3 Upgrading with update-ma
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IN PRACTICE The Falcot Corp case Fa
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purpose is editing. Browsing this c
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Chapter Solving Problems and Findin
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Man pages not only document program
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The navigation controls in the docu
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constraints... 7.2. Common Procedur
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7.2.3. Asking for Help on a Mailing
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Keywords Configuration Localization
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This chapter reviews everything inc
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The questions are relevant to the p
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to 1 Gb/s). The most widely used ca
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A connection by telephone modem req
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Network Manager knows how to handle
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TIP Bypassing DNS Since application
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8.4.3. Modifying an Existing Accoun
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The creation of an account populate
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8.7. Printer Configuration Printer
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Configuration of the bootloader mus
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oot=/dev/sda # the partition that c
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kernel /vmlinuz root=/dev/sda2 init
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The timezone, configured during ini
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GOING FURTHER GPS modules and other
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A complete list of known filesystem
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8.10.1. Introduction and Prerequisi
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the choices saved in the .config fi
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$ ls ../*.deb ../linux-image-2.6.32
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This requires, however, that lilo b
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Chapter Unix Services 9 Contents Sy
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• checking the integrity of files
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By default, Debian uses four differ
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BACK TO BASICS Client, server A sys
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that requires frequent connections
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For any connection established on t
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When the VNC session is closed, rem
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There are two ways of presenting ri
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Webmin is used through a web interf
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• news: Usenet subsystem message
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9.6. The inetd Super-Server Inetd (
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SECURITY Restricting cron or atd Yo
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# Restart the IRC proxy after each
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update the quotas in the absence of
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of backups can be kept in a small a
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The Falcot Corp administrators are
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• ACTION: the action correspondin
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ATTRS{rev}==" " ATTRS{state}=="runn
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ATTENTION Graphics card and standby
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Chapter Network10 Infrastructure Co
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sent through to the masqueraded con
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CULTURE SSL and TLS The SSL protoco
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crt for the public certificate, key
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10.2.1.2. Configuring the OpenVPN S
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fast. Installing an IKE daemon (for
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pptpd is the PPTP server for Linux.
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## some defaults nodefaultroute pro
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GOING FURTHER Optimal configuration
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# (/proc/sys/net/ipv6/conf/all/acce
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so that a security vulnerability in
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Example 10.12 Excerpt of /etc/bind/
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} option broadcast-address 192.168.
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10.8.2. Remote Diagnosis: nmap nmap
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The packet currently displayed was
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Chapter 11 Network Services: Postfi
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the ISP's SMTP server, which is alw
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alias_database = hash:/etc/aliases
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virtual_mailbox_base = /var/mail/vh
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The last two rules reject any messa
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The reject_unlisted_recipient rule
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failed messages later), especially
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# Unfiltered addresses postmaster@f
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Note that the SASL database was cre
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Apache is a modular server, and man
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# New log format including (virtual
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11.2.3.2. Restricting Access The Al
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➨ http://www.falcot.com/cgi-bin/a
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RPC services register to a director
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option, which disables this behavio
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The package also proposes identifyi
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1 5 Specifies the character set and
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username = user password = password
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11.6.3. Configuring a Filter squid
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objectClass: dcObject objectClass:
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Question Answer LDAP server Uniform
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and so on). The answer to the “co
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go into deeper detail for some conc
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Chapter Advanced12 Administration C
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CULTURE Independent or inexpensive?
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RAID-5 RAID-5 addresses the asymmet
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Filesystem label= OS type: Linux Bl
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there will be a synchronization pha
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[...] Update Time : Thu Sep 30 15:5
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Fortunately, these lines can be gen
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# pvdisplay "/dev/sdb2" is a new ph
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Allocation inherit Read ahead secto
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# cat /etc/fstab [...] /dev/vg_crit
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[...] # df -h /srv/base/ Filesystem
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• The remaining partitions, sda7
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that gets started) is known as dom0
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or Mandriva). Other methods include
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# xm list Name ID Mem VCPUs State T
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known as control groups, by which d
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into a separate switch, with the co
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done. INIT: Entering runlevel: 3 St
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12.2.3.2. Network Configuration Jus
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is accessible from all interfaces;
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We will only give a rough overview
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• from the network; preseeding th
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12.3.3. Simple-CDD: The All-In-One
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12.4. Monitoring Monitoring is a ge
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Finally, when a plugin is invoked w
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According to its type, each object
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check_command } define service{ use
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Keywords Workstation Graphical desk
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13.1. Configuring the X11 Server Th
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oth versions are available in Squee
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contains commented examples. Last,
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Figure 13.2 The KDE desktop Since t
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Evolution is the GNOME email client
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Strictly speaking, Debian Squeeze c
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The next versions of these applicat
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13.4.4.3. Collaborative Work With F
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The Windows partition must first be
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Chapter Security14 Contents Definin
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ut the other elements should also b
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• INPUT: concerns packets whose d
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Other actions, particularly those c
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Figure 14.2 Fwbuilder's main window
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• those that qualify a message as
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14.3.3.1. Auditing Packages: debsum
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The chkrootkit and rkhunter package
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Figure 14.3 Security contexts and U
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The aptitude install selinux-basics
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# semanage login -a -s user_u rhert
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# myapp executable will have: # lab
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GOING FURTHER The m4 macro language
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Message avc:denied { read write } p
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➨ http://en.wikipedia.org/wiki/SQ
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features imply a increased risk of
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confronted with these unfortunate c
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sure of actually fixing it; otherwi
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(...) ** 2004-11-29-19:50:49: DCC S
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Chapter Creating a Debian15 Package
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editor shows us that dch really did
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15.2. Building your First Package 1
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particular case, library, is useful
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The interpretation of such a rule i
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ALTERNATIVE apt-ftparchive If mini-
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a huge problem as soon as the error
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EXTRA Lightweight process for “De
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not yet gone through the new mainta
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Chapter Debian's16 Conclusion: Futu
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16.3. Future of this Book We would
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These objectives necessarily involv
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A.7. Damn Small Linux This distribu
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$ pwd /home/rhertzog $ cd Desktop $
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tmpfs 514208 269136 245072 53% /dev
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B.3.1. The Deepest Layer: the Hardw
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B.4. Some Tasks Handled by the Kern
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B.4.3. Shared Functions Since a num
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comes back when the execution of th
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• the standard C library (glibc),
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alternative, 356 am-utils, 173 aman
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Collins, Ben, 12 command line inter
Page 482 and 483:
edquota, 209 eGroupware, 366 EHLO,
Page 484 and 485:
in-addr.arpa, 241 Includes, Apache
Page 486 and 487:
lspci, 444 lspcmcia, 444 lsusb, 444
Page 488 and 489:
hardware acceleration, 190 openswan
Page 490 and 491:
ead, right, 196 README.Debian, 11,
Page 492 and 493:
suite, office, 368 super-server, 20
Page 494:
Z Zabbix, 343 Zacchiroli, Stefano,
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2 - Raspberry PI Community Projects

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