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NAME | SYNOPSIS | DESCRIPTION | OPTIONS | MODULE TYPES PROVIDED | RETURN VALUES | EXAMPLES | SEE ALSO | AUTHOR | COLOPHON |
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PAM_SECURETTY(8) Linux-PAM Manual PAM_SECURETTY(8)
pam_securetty - Limit root login to special devices
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 /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.
debug
Print debug information.
noconsole
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.
Only the auth module type is provided.
PAM_SUCCESS
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.
PAM_AUTH_ERR
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.
PAM_BUF_ERR
Memory buffer error.
PAM_CONV_ERR
The conversation method supplied by the application failed to
obtain the username.
PAM_INCOMPLETE
The conversation method supplied by the application returned
PAM_CONV_AGAIN.
PAM_SERVICE_ERR
An error occurred while the module was determining the user's
name or tty, or the module could not open the securetty file.
PAM_USER_UNKNOWN
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.
auth required pam_securetty.so
auth required pam_unix.so
securetty(5), pam.conf(5), pam.d(5), pam(8)
pam_securetty was written by Elliot Lee <[email protected]>.
This page is part of the linux-pam (Pluggable Authentication
Modules for Linux) project. Information about the project can be
found at ⟨http://www.linux-pam.org/⟩. If you have a bug report
for this manual page, see ⟨//www.linux-pam.org/⟩. This page was
obtained from the project's upstream Git repository
⟨https://github.com/linux-pam/linux-pam.git⟩ on 2023-12-22. (At
that time, the date of the most recent commit that was found in
the repository was 2023-12-18.) If you discover any rendering
problems in this HTML version of the page, or you believe there is
a better or more up-to-date source for the page, or you have
corrections or improvements to the information in this COLOPHON
(which is not part of the original manual page), send a mail to
[email protected]
Linux-PAM Manual 12/22/2023 PAM_SECURETTY(8)
Pages that refer to this page: securetty(5)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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