Check the Linux default Access control permissions specific steps

Experimental Purpose: To understand the Linux file format with permission settings

Experiment steps:

1. Log in as root into Linux

2. Create a new account using the following command Anyuser/usr/sbin/useradd Anyuser

3. Set password for Anyuser account:

/usr/sbin/passwd

Changing password for user anyuser

New UN IX Password

Retype UNIX Password

4. Log off and login with Anyuser account

5. View the contents of the Linux password file:/bin/cat/etc/passwd

Root:x:0:0:root:/bin/bash

Bin:x:1:1:bin:/bin

Daemon:x:2:2:daemon:/sbin:

Mail:x:8:12:mail:/var/spool/mail

Named:x "25:25:bind user:/var/named:

Dnscache:x:410:405:dnscache User:/var/djbdns:/bin/true

Xfs:x:414:414:x Font Server:/etc/s11/fs:/bin/false

Postfix:x:415:416:postfix:/var/spool/postrix:

Mtsql:x:416:417mysql Server:/var/lib/mysql:/bin/bash

Test:x:501:501:condor:/home/condor:/bin/bash

Anyuser:x:502:506:zhengya:/home/julia:/bin/bash

6. Logout and log in as root

7. Enter the following command:/bin/chmod o-r/etc/

chmod is the command to make a file or directory permission under Linux, and we'll introduce it in the operating system Security section for details.

8. Re-log on again with the Anyuser account, trying to list all the content under/etc/

9. Because the system no longer allows everyone access, the command should fail

10. As a non-root user, you can use the following command to make your fortune password:

host$ passwd

(current) UNIX Password:

New UNIX Password:

Retype new UNIX Password:

Passwd:all Authentication Tokens updated successfully