A short two-part talk introducing: Basic Linux/Unix system administration (CentOS/RHEL5) General Computer/Network security … for the G53SEC module. Nick.

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Presentation transcript:

A short two-part talk introducing: Basic Linux/Unix system administration (CentOS/RHEL5) General Computer/Network security … for the G53SEC module. Nick Reynolds. CentOS 5

Need entry in /etc/passwd Need password in /etc/shadow Need home directory /home/[username] Correct Permissions $ man adduser $ adduser $ man passwd $ passwd Gui Alternative: redhat-config-users

Runs on receiving a connection man xinted Start with: chkconfig krb5-telnet on Stop with: chkconfig krb5-telnet off

Read manual page: man telnetd Set up accounts using: adduser Change account shell: chsh (Tip: man ssh, chkconfig sshd on/off)

 ftp server  httpd server (apache)  ssh server  …

redhat-config-network-gui

Searching: yum search [string] Installing: yum install [package] Staying up to date: yum update Lots more!: man yum man yum.conf

Check logs: /var/log/* Monitor network activity: tcpdump Monitor processes: ps top

Move between accounts: /bin/su – [username] Permissions and ownership: chmod chgrp chown Manual pages: man

CentOS5 (RedHat EE) Documentation Linux Documentation Project Search Engines!

Many ways to achieve the same result. Experiment within a user account. Don’t make to many changes in one go. Stay up to date (yum update) Advanced methods to configure servers: man pam

Encryption Access Permissions Who/what do you trust? Network Infrastructure

Use secure Protocols InsecureSecure telnetssh ftpscp imapimaps httphttps

 File/directory permissions  Firewalls

 DHCP?  IP Addresses?

 Where does your data go?  Switches? Hubs? Which route?  Wi-fi

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