Security: Basic OS Security

Disable Services

• Remote Desktop Disable
• check active port

nmap -sT -O localhost
netstat -tulpn
netstat -ntlupa

• check daemon

chkconfig --list | grep '3:on'
service serviceName stop
chkconfig serviceName off

Files Security

• File Permission

chmod

• File Owner

chown

• File Encryption

• Harddisk Partition

df -h   make sure separate partition

• Find World Writeable files

find / -xdev -type d \( -perm -0002 -a ! -perm -1000 \) -print

• Find Noowner files

find / -xdev \( -nouser -o -nogroup \) -print

File Transfer

• Disable FTP

Sharing Files

• Enable / Disable SMB