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3rd field in /etc/shadow

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Operating Systems Solaris 3rd field in /etc/shadow
# 1  
Old 04-30-2015
3rd field in /etc/shadow
Searched and searched, but could not find a official answer.

In Solaris, on a new server build, all the system accounts look like this:

# cat /etc/shadow
Code:
root:#########:6445::::::
daemon:NP:6445::::::
bin:NP:6445::::::
sys:NP:6445::::::
adm:NP:6445::::::
lp:NP:6445::::::
uucp:NP:6445::::::
nuucp:NP:6445::::::
smmsp:NP:6445::::::
listen:*LK*:::::::
gdm:*LK*:::::::
webservd:*LK*:::::::
postgres:NP:::::::
svctag:*LK*:6445::::::
unknown:*LK*:::::::
nobody:*LK*:6445::::::
noaccess:*LK*:6445::::::
nobody4:*LK*:6445::::::


There are a lot of system created accounts and the one ROOT account. The password HAS to be set on building, therefore updating the ROOT shadow file. But it has the same update date as the untouched accounts.

I changed the password and it did change (6445 -> 16555), but what does the original number mean?

Code:
# grep root /etc/shadow
root:AAAAAAAA:6445::::::
# passwd root
New Password:
Re-enter new Password:
passwd: password successfully changed for root
# grep root /etc/shadow
root:BBBBBBB:16555::::::

Last edited by Scrutinizer; 04-30-2015 at 11:07 AM..
# 2  
Old 04-30-2015
From man shadow, Solaris 10:
Code:
Each entry in the shadow file has the form:

     username:password:lastchg:min:max:warn:inactive:expire:flag
[..]
     lastchg         The number of days between January 1,  1970,
                     and  the  date  that  the  password was last
                     modified. The lastchg  value  is  a  decimal
                     number, as interpreted by atol(3C).

Solaris 11:
Code:
     lastchg     The number of days between January 1, 1970,  and
                 the  date  that  the password was last modified.
                 The lastchg value is a decimal number, as inter-
                 preted by strtol(3C).

# 3  
Old 04-30-2015
Yes, that is the official definition, but if I built that server TODAY, it would say the same number.

I checked my Linux servers and it is correct - that number reflects the date the server was built and the root password "changed".

If I build a Solaris server TODAY and set the ROOT password during the build, it would say "6445"

Thanks you very much for replying.
# 4  
Old 04-30-2015
So it the passwords for these accounts have not been changed since August 25, 1987 (Some version of Solaris in the lab?). I don't know why this is also the case for the root account if it is set during the install.
Last edited by Scrutinizer; 04-30-2015 at 11:50 AM..
# 5  
Old 04-30-2015
Someone had this question before: Password last changed
It's probably just a date some dev thought was significant and looked better than 0. SVR4?
# 6  
Old 04-30-2015
Thank you very much. I guess I didn't search enough on all possibilities of the issue.
Smilie Smilie
# 7  
Old 04-30-2015
Yes, August 25, 1987, is probably the date when the SVR4.0 beta source code branch was first created. SVR4.0 was officially announced in October 18, 1988
This User Gave Thanks to jlliagre For This Post:
jim mcnamara
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