![]() ![]() Passwords are the primary method that Red Hat Enterprise Linux uses to verify a user's identity. Look for the title line of the operating system that you want to secure, and add a line with the lock directive immediately beneath it.įor a DOS system, the stanza should begin similar to the following: For this, a different part of the /boot/grub/nf file must be edited. Unfortunately, this solution does not prevent an attacker from booting into an insecure operating system in a dual-boot environment. The next time the system boots, the GRUB menu prevents access to the editor or command interface without first pressing p followed by the GRUB password. Replace with the value returned by /sbin/grub-md5-crypt. ![]() Open the file and below the timeout line in the main section of the document, add the following line: Next, edit the GRUB configuration file /boot/grub/nf. This returns an MD5 hash of the password. When prompted, type the GRUB password and press Enter. To do this, first choose a strong password, open a shell, log in as root, and then type the following command: ![]() You can configure GRUB to address the first two issues listed in Section 42.1.2.2, “Boot Loader Passwords” by adding a password directive to its configuration file.
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