linux-pam (1.5.3)
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VersionsPAM_NOLOGIN(8) Linux-PAM Manual PAM_NOLOGIN(8)
NAME
pam_nologin - Prevent non-root users from login
SYNOPSIS
pam_nologin.so [file=/path/nologin] [successok]
DESCRIPTION
pam_nologin is a PAM module that prevents users from logging into the system when /var/run/nologin or
/etc/nologin exists. The contents of the file are displayed to the user. The pam_nologin module has no effect on
the root user's ability to log in.
OPTIONS
file=/path/nologin
Use this file instead the default /var/run/nologin or /etc/nologin.
successok
Return PAM_SUCCESS if no file exists, the default is PAM_IGNORE.
MODULE TYPES PROVIDED
The auth and account module types are provided.
RETURN VALUES
PAM_AUTH_ERR
The user is not root and /etc/nologin exists, so the user is not permitted to log in.
PAM_BUF_ERR
Memory buffer error.
PAM_IGNORE
This is the default return value.
PAM_SUCCESS
Success: either the user is root or the nologin file does not exist.
PAM_USER_UNKNOWN
User not known to the underlying authentication module.
EXAMPLES
The suggested usage for /etc/pam.d/login is:
auth required pam_nologin.so
NOTES
In order to make this module effective, all login methods should be secured by it. It should be used as a
required method listed before any sufficient methods in order to get standard Unix nologin semantics. Note, the
use of successok module argument causes the module to return PAM_SUCCESS and as such would break such a
configuration - failing sufficient modules would lead to a successful login because the nologin module succeeded.
SEE ALSO
nologin(5), pam.conf(5), pam.d(5), pam(8)
AUTHOR
pam_nologin was written by Michael K. Johnson <johnsonm@redhat.com>.
Linux-PAM 05/07/2023 PAM_NOLOGIN(8)
NAME
pam_nologin - Prevent non-root users from login
SYNOPSIS
pam_nologin.so [file=/path/nologin] [successok]
DESCRIPTION
pam_nologin is a PAM module that prevents users from logging into the system when /var/run/nologin or
/etc/nologin exists. The contents of the file are displayed to the user. The pam_nologin module has no effect on
the root user's ability to log in.
OPTIONS
file=/path/nologin
Use this file instead the default /var/run/nologin or /etc/nologin.
successok
Return PAM_SUCCESS if no file exists, the default is PAM_IGNORE.
MODULE TYPES PROVIDED
The auth and account module types are provided.
RETURN VALUES
PAM_AUTH_ERR
The user is not root and /etc/nologin exists, so the user is not permitted to log in.
PAM_BUF_ERR
Memory buffer error.
PAM_IGNORE
This is the default return value.
PAM_SUCCESS
Success: either the user is root or the nologin file does not exist.
PAM_USER_UNKNOWN
User not known to the underlying authentication module.
EXAMPLES
The suggested usage for /etc/pam.d/login is:
auth required pam_nologin.so
NOTES
In order to make this module effective, all login methods should be secured by it. It should be used as a
required method listed before any sufficient methods in order to get standard Unix nologin semantics. Note, the
use of successok module argument causes the module to return PAM_SUCCESS and as such would break such a
configuration - failing sufficient modules would lead to a successful login because the nologin module succeeded.
SEE ALSO
nologin(5), pam.conf(5), pam.d(5), pam(8)
AUTHOR
pam_nologin was written by Michael K. Johnson <johnsonm@redhat.com>.
Linux-PAM 05/07/2023 PAM_NOLOGIN(8)