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ENTERPRISE LINUX 4 - SELINUX GUIDE
User's Guide
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Red Hat Enterprise Linux 6
1
Security Guide
1
Edition 1.5
2
1. Document Conventions
7
1.2. Pull-quote Conventions
8
2. We Need Feedback!
9
Security Overview
11
1.1.1.2. Security Today
12
1.1.2. SELinux
13
1.1.3. Security Controls
13
1.1.4. Conclusion
14
1.2. Vulnerability Assessment
15
1.2.3. Evaluating the Tools
17
1.2.3.2. Nessus
18
1.2.3.3. Nikto
18
1.3.1.1. Shades of Gray
19
1.3.2.1.1. Broadcast Networks
20
1.3.3.2. Unpatched Services
21
1.3.4.1. Bad Passwords
22
1.5. Security Updates
25
1.5.4. Applying the Changes
27
Applying the Changes
29
Securing Your Network
31
/sbin/grub-md5-crypt
32
2.1.3. Password Security
33
2.1.3.2.2. Passphrases
37
2.1.3.2.3. Password Aging
37
2.1.4.1. Allowing Root Access
39
2.1.4.3. Limiting Root Access
42
2.1.4.3.2. The sudo Command
43
2.1.5.1. Risks To Services
44
2.1.5.3. Insecure Services
46
2.1.6. Personal Firewalls
47
2.2. Server Security
48
220-Hello, %c
49
2.2.1.2.1. Setting a Trap
50
2.2.2. Securing Portmap
52
2.2.3. Securing NIS
52
255.255.255.0 192.168.0.0
54
2.2.4. Securing NFS
55
UserDir enabled
56
UserDir disabled root
56
2.2.6. Securing FTP
57
2.2.6.2. Anonymous Access
58
2.2.6.3. User Accounts
58
2.2.7. Securing Sendmail
59
2.2.7.3. Mail-only Users
60
2.3. TCP Wrappers and xinetd
61
2.3.1. TCP Wrappers
62
[root@myServer ~]#
63
2.3.2.1.1. Wildcards
65
2.3.2.1.4. Operators
67
2.3.2.2. Option Fields
68
2.3.2.2.4. Expansions
69
2.3.3. xinetd
70
2.3.4.3.1. Logging Options
72
2.3.5. Additional Resources
75
2.3.5.3. Related Books
76
2.4.1. How Does a VPN Work?
77
2.4.2. Openswan
77
2.4.2.3. Commands
78
2.5. Firewalls
79
2.5.1. Netfilter and IPTables
81
2.5.2.3. Trusted Services
83
2.5.2.4. Other Ports
83
2.5.3. Using IPTables
84
2.5.5. FORWARD and NAT Rules
86
2.5.5.2. Prerouting
88
2.5.5.3. DMZs and IPTables
88
2.5.8. IPv6
90
2.5.9. Additional Resources
90
2.6. IPTables
91
2.6.2.2. Command Options
94
2.6.2.4.1. TCP Protocol
97
2.6.2.4.2. UDP Protocol
98
2.6.2.4.3. ICMP Protocol
98
2.6.2.5. Target Options
99
2.6.3. Saving IPTables Rules
101
2.6.5. IPTables and IPv6
104
2.6.6. Additional Resources
104
Encryption
105
3.5. Virtual Private Networks
106
3.6. Secure Shell
106
3.7. OpenSSL PadLock Engine
106
3.8. LUKS Disk Encryption
107
Important
108
3.8.5. Links of Interest
109
Security
113
Secure Installation
115
Software Maintenance
117
7.1. Introduction
119
(NISPOM)
120
References
121
A.1. Synchronous Encryption
123
A.2. Public-key Encryption
124
A.2.2. RSA
125
A.2.3. DSA
125
A.2.4. SSL/TLS
125
A.2.6. ElGamal Encryption
126
Appendix B. Revision History
127
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