Red Hat ENTERPRISE LINUX 4 - SELINUX GUIDE manuali

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Indice

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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