Hack password trong Linux - Admin �?c Blog ??

1. Tr�n Linux, vi?c reset password cho account root c� th? th?c hi?n m?t c�ch d? d�ng b?ng ch? �? boot single-user

1.1 Tr�n GRUB:
Khi m�n h?nh ch?n kernel �? boot xu?t hi?n, nh?n �e� �? v�o ch? �? edit c�c tham s? kh?i �?ng.
Ch?n d?ng ch?a tham s? kernel. V� d?:

kernel /boot/vmlinuz-2.6.11 ro root=LABEL=/

Nh?n �e� �? v�o c?a s? so?n th?o.
Di chuy?n �?n cu?i d?ng, th�m ch? �single� v�o. Press Enter �? l�u thay �?i. G? �b� �? boot v?i ch? �? single-user.
B?n s? c� ��?c c�i shell c?a root m� kh�ng b? h?i password g? c?. L�c n�y ch? b?ng l?nh �passwd� b?n �? c� th? d? d�ng �?i password root r?i ��! Xong g? �exit� �? h? th?ng ti?p t?c boot b?nh th�?ng.

2.2 Tr�n LILO:
N?u b?n d�ng LILO ? ch? �? graphic th? khi m�n h?nh LILO hi?n l�n nh?n �Ctrl-x� �? tho�t giao di?n �? h?a v� v�o d?u nh?c �boot:�. G? v�o
linux single
Sau �� b?n s? ��?c v�o account root m� kh�ng c?n password g? c?! Th?c hi?n �?i pass nh� tr�n.

2. V?y th? b?t c? ai ng?i tr�n Linux box c?a b?n c?ng c� th? chi?m quy?n root? Yeah. Gi?i ph�p: �?t password cho boot loader GRUB/LILO.
2.1 Protecting GRUB
Kh�ng cho edit GRUB config �? v�o single mode.
�T?o password grub ��?c hash v?i md5G? /sbin/grub-md5-crypt G? password Grub v�o
Ta ��?c m?t gi� tr? hash
�Edit GRUB config file: /boot/grub/grub.conf: Ph�a d�?i d?ng timeout th�m v�o: password �md5
Bonus: B?t ph?i nh?p password GRUB m?i ��?c kh?i �?ng HDH:
�G? v�o ph�a d�?i d?ng title: lock
�G? password �md5 v�o

2.2 Protecting LILO
Ph?i nh?p pass �? boot:
�Edit file /etc/lilo.conf: tr�?c image, th�m v�o password=
�Ch?y /sbin/lilo �v �v �? update lilo
B?o v? c? th? cho image n�o: tr�?c image=/boot/vmlinuz- d?ng password=

Cho ph�p user kh?i �?ng nh�ng kh�ng cho th�m tham s? �? v�o single-userm� kh�ng c� password: th�m d?ng restricted v�o ph�a d�?i password.

H?y �?t th�m password cho GRUB/LILO �? tr�nh b? m?t quy?n �i?u khi?n h? th?ng khi s� ?.