Red Hat NETSCAPE MANAGEMENT SYSTEM 6.2 - COMMAND-LINE Guida di Installazione Pagina 2
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Table of Contents
1. Introduction.....................................................................................................................................................1
1.1. Why me?...........................................................................................................................................1
1.2. Notes.................................................................................................................................................2
1.3. Copyright..........................................................................................................................................2
1.4. Credits...............................................................................................................................................3
1.5. Disclaimer.........................................................................................................................................3
1.6. New Versions and Changelog...........................................................................................................3
1.7. Feedback...........................................................................................................................................4
2. Foreword..........................................................................................................................................................5
2.1. The Optimum Configuration............................................................................................................6
2.2. Before We Start.................................................................................................................................6
3. Step 1: Which services do we really need?...................................................................................................7
3.1. System Audit.....................................................................................................................................7
3.2. The Danger Zone (or r00t m3 pl34s3)..............................................................................................9
3.3. Stopping Services.............................................................................................................................9
3.3.1. Stopping Init Services.....................................................................................................10
3.3.2. Inetd................................................................................................................................11
3.3.3. Xinetd..............................................................................................................................13
3.3.4. When All Else Fails........................................................................................................14
3.4. Exceptions.......................................................................................................................................15
3.5. Summary and Conclusions for Step 1.............................................................................................16
4. Step 2: Updating............................................................................................................................................17
4.1. Summary and Conclusions for Step 2.............................................................................................17
5. Step 3: Firewalls and Setting Access Policies.............................................................................................19
5.1. Strategy...........................................................................................................................................19
5.2. Packet Filters −− Ipchains and Iptables..........................................................................................19
5.2.1. ipchains...........................................................................................................................20
5.2.2. iptables............................................................................................................................23
5.2.3. Red Hat Firewall Configuration Tools...........................................................................25
5.3. Tcpwrappers (libwrap)....................................................................................................................26
5.3.1. xinetd..............................................................................................................................28
5.4. PortSentry.......................................................................................................................................29
5.5. Proxies............................................................................................................................................29
5.6. Individual Applications...................................................................................................................30
5.7. Verifying.........................................................................................................................................32
5.8. Logging...........................................................................................................................................33
5.9. Where to Start.................................................................................................................................34
5.10. Summary and Conclusions for Step 3...........................................................................................34
6. Intrusion Detection.......................................................................................................................................36
6.1. Intrusion Detection Systems (IDS).................................................................................................36
6.2. Have I Been Hacked?......................................................................................................................36
6.3. Reclaiming a Compromised System...............................................................................................38
Security Quick−Start HOWTO for Red Hat Linux
i
- Hal Burgiss 1
- Table of Contents 2
- 1. Introduction 4
- 1.2. Notes 5
- 1.3. Copyright 5
- 1.4. Credits 6
- 1.5. Disclaimer 6
- 1.7. Feedback 7
- 2. Foreword 8
- 2.2. Before We Start 9
- 3.1. System Audit 10
- 3.3. Stopping Services 12
- 3.3.1. Stopping Init Services 13
- 3.3.2. Inetd 14
- 3.3.2. Inetd 12 15
- 3.3.3. Xinetd 16
- 3.3.4. When All Else Fails 17
- 3.4. Exceptions 18
- 4. Step 2: Updating 20
- 4. Step 2: Updating 18 21
- 5.1. Strategy 22
- 5.2.1. ipchains 23
- 5.2.1. ipchains 21 24
- 5.2.2. iptables 26
- 5.2.2. iptables 24 27
- 5.3. Tcpwrappers (libwrap) 29
- 5.3.1. xinetd 31
- 5.4. PortSentry 32
- 5.5. Proxies 32
- 5.6. Individual Applications 33
- 5.7. Verifying 35
- 5.8. Logging 36
- 5.9. Where to Start 37
- 6. Intrusion Detection 39
- # chattr +i /bin/ps 40
- −−−i−−−−−−−−−− /bin/ps 40
- # chattr −i /bin/ps 40
- 7. General Tips 43
- # must exist 44
- root: hal@bigcat 44
- 8. Appendix 46
- 8.2. Common Ports 48
- 8.3. Netstat Tutorial 51
- 8.4. Attacks and Threats 59
- 8.4.2. Rootkits 60
- 8.4.3. Worms and Zombies 60
- 8.4.4. Script Kiddies 61
- 8.4.5. Spoofed IPs 61
- 8.4.6. Targeted Attacks 61
- 8.4.8. Brute Force 62
- 8.5. Links 63
- 8.6. Editing Text Files 65
- 8.7. nmap 68
- 8.8. Sysctl Options 71
- 8.8. Sysctl Options 69 72
- 8.9. Secure Alternatives 73
- 8.9. Secure Alternatives 71 74
- 8.9. Secure Alternatives 72 75
- 8.9. Secure Alternatives 73 76
- 8.10.2. iptables II 77
- 8.10.2. iptables II 75 78
- 8.10.2. iptables II 76 79
- 8.10.2. iptables II 77 80
- 8.10.3. Summary 81
- 8.10.4. iptables mini−me 82
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