BSD

Hello!
I am new to the forum and I need help on restoring root user's password or access the form of single user mode under operating system very long-standing family bsd - Unix system V I think it's also called srv4. I managed to enter the owner of IPL, and a moment after the rise of system knocked enter by: m to the single user mode and really got the Prompt but here I am prompted for a password. How do I get out of this situation. Any help will be accepted gratefully acknowledged.

Google is a really great thing .
https://www.unix.com/security/91428-h...-system-v.html

Here you go


Root Password - Easy Method:

The simplest way to recover from a lost password is to boot into single user mode.

If you are using LILO, at the LILO boot prompt (graphical LILO users can press Ctrl-x to exit the graphical screen and go to the boot: prompt), enter:

Code:
linux single

This will make you the "root" user without asking for a password. Once the system has booted, you can change the root password using the password command:

Code:
passwd
The instructions for GRUB users are similar. Press 'e' at the GRUB prompt to select boot parameters. Select the line for the kernel you want to boot, and go to the end of it. Add "single" as a separate word, and then press ENTER to exit the edit mode. Once back at the GRUB screen, press "b" to boot into single user mode.



Root Password - Not As Easy Method:

If for whatever reason, the above solution doesn't work for you, there is another option. Boot using a so called "Live CD" Linux distribution, such as Knoppix. For the purposes of this example, it will be assumed that the user is using Knoppix.
After booting up from the Knoppix CD, go to a terminal and su to root (no password is required). After your priviledges have been escalated, issue the following commands (be sure to replace each /hda1 with your own root ('/') partition):

Code:
mount -o dev,rw /mnt/hda1 cd /mnt/hda1/etc

Once you are into your system /etc directory, you can use a text-editor (such as vim, nano, pico, etc.) to edit the /etc/shadow file where the password is stored. Various information about root and user accounts is kept in this plain-text file, but we are only concerned with the password portion.

For example, the /etc/shadow entry for the "root" account may look something like this:

Code:
root:$1$aB7mx0Licb$CTbs2RQrfPHkz5Vna0.fnz8H68tB.:/
10852:0:99999:7:::
(The '/' indicates a line continuation)

Now, using your favorite editor (I'll use vim) delete the password hash (the green text).

Code:
vim shadow

After you've edited this field, it should look like this:

Code:
root::10852:0:99999:7:::

Now save the file and change back to the root directory and unmount the system root partition (don't forget to change the /hda1) as follows:

Code:
cd / umount /mnt/hda1

Now reboot the computer.

Once the computer has booted and you're at the login prompt, type "root" and when asked for the password just press ENTER (entering no password). After a successful login, you need to set the new password for root using the following command:

Code:
passwd




Forgotten or Lost "User" Password:

If a regular user forgets his/her password, the root user can easily reset the user's password. For this example, the username will be "bob".

Enter (as root):

Code:
passwd bob

This will prompt for a new password for the user "bob".