pam_securetty.so [
debug
]
pam_securetty is a PAM module that allows root logins only if the
user is logging in on a "secure" tty, as defined by the listing
in the securetty file. pam_securetty checks at
first, if /etc/securetty exists. If not and
it was built with vendordir support, it will use
%vendordir%/securetty. pam_securetty also
checks that the securetty files are plain
files and not world writable. It will also allow root logins on
the tty specified with console= switch on the
kernel command line and on ttys from the
/sys/class/tty/console/active.
This module has no effect on non-root users and requires that the application fills in the PAM_TTY item correctly.
For canonical usage, should be listed as a required authentication method before any sufficient authentication methods.
Print debug information.
Do not automatically allow root logins on the kernel console
device, as specified on the kernel command line or by the sys file,
if it is not also specified in the
securetty file.
The user is allowed to continue authentication. Either the user is not root, or the root user is trying to log in on an acceptable device.
Authentication is rejected. Either root is attempting to
log in via an unacceptable device, or the
securetty file is world writable or
not a normal file.
Memory buffer error.
The conversation method supplied by the application failed to obtain the username.
The conversation method supplied by the application returned PAM_CONV_AGAIN.
An error occurred while the module was determining the
user's name or tty, or the module could not open
the securetty file.
The module could not find the user name in the
/etc/passwd file to verify whether
the user had a UID of 0. Therefore, the results of running
this module are ignored.