On 10/25/12 3:29 PM, Robert Sanders wrote:
As I mentioned in the conference call, we have a slightly different way of doing the
login banner that also gets the user's acknowledgement sent to /var/log/secure (or
the equivalent). I should note that our tool helps with remediating a box against several
different guidelines. Hence we tried to find as 'simple' a way to do this as
possible, without large banners looking seriously cramped (IE - cram the full DoD login
banner into the default authentication dialog on a small screen). We also tried to
support both pure Gnome (GDM) and KDE (kdm). I'll handwave through the details (ping
me if you'd like more info).
Basically we add wording to the main login with text along the lines of:
All users will be required to read and accept a 'Consent to Monitor' statement
before being allowed to login.
The response will be logged.
This text fits nicely on most of the OS's we support, and is shown on every
graphical login attempt on the main authentication display. Currently for GDM on
Fedora/RHEL6 we make these changes to/apps/gdm/simple-greeter/*, most of the other Linux
boxes we'll change the /etc/X11/gdm/gdm.conf or /etc/gdm/custom.conf file instead.
For KDM it all goes to /usr/share/config/kdm/kdmrc.
To display the actual required login banner we tweak the
/etc/X11/gdm/PreSession/Default (Solaris), /etc/X11/xdm/Xsession (RH4), or
/etc/X11/xinit/Xsession (everyone else) file to call a script that uses zenity or kdialog
(use first one found) to display the text of the banner. Since we do support other
guidelines that may just require notification, we have our dialog may just have an
acknowledgement button or an explicit accept/deny button. The user's response is
logged using the first of /usr/sbin/logger, /sbin/logger, /usr/bin/logger, or /bin/logger
with authpriv.notice. Obviously if the user hits deny we fail out back to the
Disadvantages : change to expected login procedure/alternate login mananger, extra
script on login
Advantages : acknowledgement tied that the login banner was accepted/read to a
particular user, better framing of potentially large banner text
I'm interested in the concept of logging the user acceptance, but I'm
not sure I understand the process your users follow. From what I gather
a user attempts to login via GUI, is presented with the standard DoD
banner, then is presented with your custom prompt of which logs their