11-29-2008
How to reset root password of old Unix System V
Hi all,
This is first time I met unix in my life. I purchased old Scanning Elecron Microscope which came with 486/33MHz PC running Unix System V, ver. 3.6. The one simple user name/passw is known so I can boot and login. But can not shutdown! It asks root or su passw. I'm very sensitive not to destroy any configuration. As advised on this foum I found /etc/passwd file but inside is only 'x' in places of passwords - means they are in shadow file. I found it however I was not allowed even to look in to it.
My idea is such - to boot from floppy, take this shadow file and then try to use JtR cracker. Or take out HDD, put on another Unix machine and copy or look in to shadow file then.
Can somebody advise - would it work to go this way?
- would all configuration and startup information survive if I would access HDD booted not from it?
- can somebody recomend where to download light bootable floppy version of suitable for me Unix?
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LEARN ABOUT CENTOS
gshadow
GSHADOW(5) File Formats and Conversions GSHADOW(5)
NAME
gshadow - shadowed group file
DESCRIPTION
/etc/gshadow contains the shadowed information for group accounts.
This file must not be readable by regular users if password security is to be maintained.
Each line of this file contains the following colon-separated fields:
group name
It must be a valid group name, which exist on the system.
encrypted password
Refer to crypt(3) for details on how this string is interpreted.
If the password field contains some string that is not a valid result of crypt(3), for instance ! or *, users will not be able to use a
unix password to access the group (but group members do not need the password).
The password is used when an user who is not a member of the group wants to gain the permissions of this group (see newgrp(1)).
This field may be empty, in which case only the group members can gain the group permissions.
A password field which starts with a exclamation mark means that the password is locked. The remaining characters on the line represent
the password field before the password was locked.
This password supersedes any password specified in /etc/group.
administrators
It must be a comma-separated list of user names.
Administrators can change the password or the members of the group.
Administrators also have the same permissions as the members (see below).
members
It must be a comma-separated list of user names.
Members can access the group without being prompted for a password.
You should use the same list of users as in /etc/group.
FILES
/etc/group
Group account information.
/etc/gshadow
Secure group account information.
SEE ALSO
gpasswd(5), group(5), grpck(8), grpconv(8), newgrp(1).
shadow-utils 4.1.5.1 05/25/2012 GSHADOW(5)