Hello:
PJN wrote,
> If I'm not mistaken, the shadow passwords used in linux are hashed and
> have a random 'salt'
Correct.
> First of all, how random is this salt?
As random as /dev/random can get.
> I presume it changes if the operating system is reinstalled.
Thats a wrong assumption. It changes every time you call /dev/random.
> If it does, here is my next question: I am going to be formatting and
> rebuilding an old server that has around 200 users configured to use
> it. Is it enough to back up /etc/passwd, /etc/shadow and /etc/groups
> or do I have to do something more?
For just restoring authentication, you will just need the following
files:
- /etc/passwd
- /etc/shadow
- /etc/group
- /etc/gshadow
> Will a different 'salt' in effect after the reinstallation cause any
> problems to the existing passwords?
The salt will be the same since you are restoring your old files.
-- Shanu
--
Be valiant, but not too venturous.
Let thy attire be comely, but not costly.
-- John Lyly
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