pam_shells.so
pam_shells is a PAM module that only allows access to the
system if the user's shell is listed in /etc/shells
.
It also checks if /etc/shells
is a plain
file and not world writable.
Access to the system was denied.
The user's login shell was listed as valid shell in
/etc/shells
.
The module was not able to get the name of the user.