user login allowed in ubuntu

In Ubuntu, How can I check which users has the rights to login allowed ?

Can I see it in the passwd file?

The question is how can I see if a user account has the right to login in the usual login page

Thanks
lnriveraAsked:
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farzanjCommented:
You can do a number of checks.  See /etc/shadow file and see which users have a password hash without  a leading !.

Get the list of those users and run the following command

chage -l userID
The above option is lower case L.
Also, see if the user has a valid login shell.  If he doesn't, it would keep logging him through command line login.

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serialbandCommented:
If the users users ssh keys, then the leading ! in /etc/shadow doesn't actually lock them out from remote access.  It only blocks password access.  A fully locked out user has both the leading ! and an invalid login shell, or just a commented out password entry.
1ly4meCommented:
Yes, /etc/passwd file gives you access right for every user unless the users are allowed through SSH authorization.
farzanjCommented:
Even SSH relies on /etc/passwd and /etc/shadow mechanism except in case of ssh public/private key certificates in which case, it would bypass passwords completely.  But in this case there would be ~/.ssh/authorized_keys file with public part of certificates.
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