02-27-2014
Furthermore to scrutinizer's post, you should then create a /etc/securetty fille with 644 perms and containing only authorised consoles usually its just console if this blocks most cases Im not sure about xdmcp though...
HP had their own su soft called su2 but cant remember where to download the source, it had compared to standard su a super-users file where you put thoses allowed to use it but now there is a good sudo and I suppose su2 is obsoleted...
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LEARN ABOUT CENTOS
pam_console_apply
pam_console_apply(8) System Administrator's Manual pam_console_apply(8)
NAME
pam_console_apply - set or revoke permissions for users at the system console
SYNOPSIS
pam_console_apply [-f <fstab file>] [-c <console.perms file>] [-r] [-t <tty>] [-s] [-d] [<device file> ...]
DESCRIPTION
pam_console_apply is a helper executable which sets or resets permissions on device nodes.
If /var/run/console.lock exists, pam_console_apply will grant permissions to the user listed therein. If the lock file does not exist,
permissions are reset according to defaults set in console.perms files, normally configured to set permissions on devices so that root owns
them.
When initializing its configuration it first parses the /etc/security/console.perms file and then it searches for files ending with the
.perms suffix in the /etc/security/console.perms.d directory. These files are parsed in the lexical order in "C" locale. Permission rules
are appended to a global list, console and device class definitions override previous definitions of the same class.
ARGUMENTS
-c Load other console.perms file than the default one.
-f Load other fstab file than the default one (/etc/fstab).
-r Signals pam_console_apply to reset permissions. The default is to set permissions so that the user listed in /var/run/console.lock
has access to the devices, and to reset permissions if no such file exists.
-t Use <tty> to match console class in console.perms file. The default is tty0.
-s Write error messages to the system log instead of stderr.
-d Log/display messages useful for debugging.
The optional <device file> arguments constrain what files should be affected by pam_console_apply. If they aren't specified permissions are
changed on all files specified in the console.perms file.
FILES
/var/run/console.lock
/etc/security/console.perms
/etc/security/console.perms.d/50-default.perms
SEE ALSO
pam_console(8)
console.perms(5)
BUGS
Let's hope not, but if you find any, please report them via the "Bug Track" link at http://bugzilla.redhat.com/bugzilla/
AUTHORS
Nalin Dahyabhai <nalin@redhat.com>, using code shamelessly stolen from parts of pam_console.
Support of console.perms.d and other improvements by Tomas Mraz <tmraz@redhat.com>.
Red Hat 2005/5/2 pam_console_apply(8)