Bsd Hacks

BSD Hacks offers a unique set of tips, tricks, and tools for administrators and power users of these systems. Users learn how to save time, get more done with fewer resources, and take advantage of the tools and concepts that make the world's top Unix users more productive. And because this is an O'Reilly Hacks book, it shows them how to have some fun at the same time.

Dru is an instructor at Marketbridge Technologies in Ottawa and the maintainer of the Open Protocol Resource. In her non-existent spare time, you can find her shooting Remic's Rapids or cycling through Gatineau Park.

Credits

vii

Preface

xiii

Chapter 1. Customizing the User Environment

1

(48)

1. Get the Most Out of the Default Shell

1

(5)

2. Useful tcsh Shell Configuration File Options

6

(3)

3. Create Shell Bindings

9

(3)

4. Use Terminal and X Bindings

12

(4)

5. Use the Mouse at a Terminal

16

(2)

6. Get Your Daily Dose of Trivia

18

(4)

7. Lock the Screen

22

(2)

8. Create a Trash Directory

24

(4)

9. Customize User Configurations

28

(8)

10. Maintain Your Environment on Multiple Systems

36

(4)

11. Use an Interactive Shell

40

(4)

12. Use Multiple Screens on One Terminal

44

(5)

Chapter 2. Dealing with Files and Filesystems

49

(47)

13. Find Things

49

(4)

14. Get the Most Out of grep

53

(4)

15. Manipulate Files with sed

57

(3)

16. Format Text at the Command Line

60

(5)

17. Delimiter Dilemma

65

(3)

18. DOS Floppy Manipulation

68

(7)

19. Access Windows Shares Without a Server

75

(3)

20. Deal with Disk Hogs

78

(5)

21. Manage Temporary Files and Swap Space

83

(3)

22. Recreate a Directory Structure Using mtree

86

(5)

23. Ghosting Systems

91

(5)

Chapter 3. The Boot and Login Environments

96

(44)

24. Customize the Default Boot Menu

96

(5)

25. Protect the Boot Process

101

(3)

26. Run a Headless System

104

(4)

27. Log a Headless Server Remotely

108

(3)

28. Remove the Terminal Login Banner

111

(3)

29. Protecting Passwords With Blowfish Hashes

114

(3)

30. Monitor Password Policy Compliance

117

(7)

31. Create an Effective, Reusable Password Policy

124

(4)

32. Automate Memorable Password Generation

128

(4)

33. Use One Time Passwords

132

(4)

34. Restrict Logins

136

(4)

Chapter 4. Backing Up

140

(29)

35. Back Up FreeBSD with SMBFS

140

(4)

36. Create Portable POSIX Archives

144

(4)

37. Interactive Copy

148

(3)

38. Secure Backups Over a Network

151

(2)

39. Automate Remote Backups

153

(6)

40. Automate Data Dumps for PostgreSQL Databases

159

(3)

41. Perform Client-Server Cross-Platform Backups with Bacula

162

(7)

Chapter 5. Networking Hacks

169

(47)

42. See Console Messages Over a Remote Login

169

(3)

43. Spoof a MAC Address

172

(3)

44. Use Multiple Wireless NIC Configurations

175

(5)

45. Survive Catastrophic Internet Loss

180

(3)

46. Humanize tcpdump Output

183

(6)

47. Understand DNS Records and Tools

189

(6)

48. Send and Receive Email Without a Mail Client

195

(5)

49. Why Do I Need sendmail?

200

(3)

50. Hold Email for Later Delivery

203

(3)

51. Get the Most Out of FTP

206

(3)

52. Distributed Command Execution

209

(3)

53. Interactive Remote Administration

212

(4)

Chapter 6. Securing the System

216

(75)

54. Strip the Kernel

216

(9)

55. FreeBSD Access Control Lists

225

(6)

56. Protect Files with Flags

231

(6)

57. Tighten Security with Mandatory Access Control

237

(3)

58. Use mtree as a Built-in Tripwire

240

(5)

59. Intrusion Detection with Snort, ACID, MySQL, and FreeBSD

245

(11)

60. Encrypt Your Hard Disk

256

(5)

61. Sudo Gotchas

261

(3)

62. sudoscript

264

(5)

63. Restrict an SSH server

269

(3)

64. Script IP Filter Rulesets

272

(3)

65. Secure a Wireless Network Using PF

275

(4)

66. Automatically Generate Firewall Rules

279

(4)

67. Automate Security Patches

283

(3)

68. Scan a Network of Windows Computers for Viruses

286

(5)

Chapter 7. Going Beyond the Basics

291

(36)

69. Tune FreeBSD for Different Applications

291

(5)

70. Traffic Shaping on FreeBSD

296

(6)

71. Create an Emergency Repair Kit

302

(3)

72. Use the FreeBSD Recovery Process

305

(4)

73. Use the GNU Debugger to Analyze a Buffer Overflow

309

(4)

74. Consolidate Web Server Logs

313

(5)

75. Script User Interaction

318

(4)

76. Create a Trade Show Demo

322

(5)

Chapter 8. Keeping Up-to-Date

327

(44)

77. Automated Install

327

(4)

78. FreeBSD From Scratch

331

(5)

79. Safely Merge Changes to /etc

336

(4)

80. Automate Updates

340

(4)

81. Create a Package Repository

344

(3)

82. Build a Port Without the Ports Tree

347

(3)

83. Keep Ports Up-to-Date with CTM

350

(3)

84. Navigate the Ports System

353

(4)

85. Downgrade a Port

357

(3)

86. Create Your Own Startup Scripts

360

(4)

87. Automate NetBSD Package Builds

364

(3)

88. Easily Install Unix Applications on Mac OS X

367

(4)

Chapter 9. Grokking BSD

371

(40)

89. How'd He Know That?

371

(3)

90. Create Your Own Manpages

374

(4)

91. Get the Most Out of Manpages

378

(3)

92. Apply, Understand, and Create Patches

381

(5)

93. Display Hardware Information

386

(4)

94. Determine Who Is on the System

390

(3)

95. Spelling Bee

393

(4)

96. Leave on Time

397

(2)

97. Run Native Java Applications

399

(3)

98. Rotate Your Signature

402

(2)

99. Useful One-Liners

404

(3)

100. Fun with X

407

(4)

Index

411

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Summary

Author Biography

Table of Contents

Supplemental Materials