Red Hat ENTERPRISE LINUX 4 - SELINUX GUIDE User's Guide download pdf (Page 29)

Applying the Changes

In the previous examples, replace <PID> with the process identification number (found in the

second column of the ps command) for an IMAP session.

To kill all active IMAP sessions, issue the following command:

killall imapd

1 2 ... 24 25 26 27 28 29 30 31 32 33 34 ... 127 128

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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