Linux Security Check Method

Linux security check method-general Linux technology-Linux technology and application information. For details, refer to the following section. Guidance:
Check the system password file and check the file modification date.
[Root @ fedora ~] # Ls-l/etc/passwd

View privileged users in the passwd file
[Root @ fedora ~] # Awk-F: '$3 = 0 {print $1}'/etc/passwd

Check whether there is a blank password account in the system.
Awk-F: 'length ($2) = 0 {print $1} '/etc/shadow

Check the system daemon process
Cat/etc/inetd. conf | grep-v "^ #"

Check network connection and listening port
Netstat? An
Netstat? Rn
Ifconfig? A

View historical records of all users logging on to the local machine under normal conditions
Last

Check the core file in the system
Find/-name core-exec ls-l {}\;

Check System File integrity
Rpm? Qf/bin/ls
Rpm-qf/bin/login
Md5sum? B file name
Md5sum? T file name

Check for backdoor
Cat/etc/crontab
Ls/var/spool/cron/
Cat/etc/rc. d/rc. local
Ls/etc/rc. d
Ls/etc/rc3.d
Find/-type f-perm 4000