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Description of problem:
While changing the password of root from cockpit interface, the old password filed is not considered or checked and setting the new password only. This is observed multiple time and sometimes only, the setting will fail but there is no message in the cockpit that old password is not correct. 

There should be some way to check an old password and display a message if it's incorrect.   

Version-Release number of selected component (if applicable):
RHEL8
cockpit-system-184-1.el8.noarch


How reproducible:
Always

Steps to Reproduce:
1. Change the password from the cockpit
2. type anything in an old password field.
3. change password

Actual results:
The password is getting changed even if an old password is any string

Expected results:
- An old password should be checked.
- There should be message/ WARN if an old pass does not match. 

Additional info:

Created attachment 1520747 [details]
screenshot when changing root password

I tried to reproduce this. When trying to change root's password, it doesn't ask for the old password at all (see attached screenshot). This coincides with changing it on the command line:

# passwd root
Changing password for user root.
New password:

Oh, got it -- this happens if you log into cockpit *as root*, as then this goes through the "change password of your own account" logic. But the command line does not ask for your own password if you change root's password as root.

So this is just a cosmetical issue, it shouldn't display the "Old password" input line in this case.

https://github.com/cockpit-project/cockpit/pull/10972

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2019:3518