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NAME | SYNOPSIS | DESCRIPTION | OPTIONS | MODULE TYPES PROVIDED | RETURN VALUES | EXAMPLES | SEE ALSO | AUTHOR | COLOPHON |
PAM_WHEEL(8) Linux-PAM Manual PAM_WHEEL(8)
pam_wheel - Only permit root access to members of group wheel
pam_wheel.so [debug] [deny] [group=name] [root_only] [trust]
[use_uid]
The pam_wheel PAM module is used to enforce the so-called wheel
group. By default it permits root access to the system if the
applicant user is a member of the wheel group. If no group with this
name exist, the module is using the group with the group-ID 0.
debug
Print debug information.
deny
Reverse the sense of the auth operation: if the user is trying to
get UID 0 access and is a member of the wheel group (or the group
of the group option), deny access. Conversely, if the user is not
in the group, return PAM_IGNORE (unless trust was also specified,
in which case we return PAM_SUCCESS).
group=name
Instead of checking the wheel or GID 0 groups, use the name group
to perform the authentication.
root_only
The check for wheel membership is done only when the target user
UID is 0.
trust
The pam_wheel module will return PAM_SUCCESS instead of
PAM_IGNORE if the user is a member of the wheel group (thus with
a little play stacking the modules the wheel members may be able
to su to root without being prompted for a passwd).
use_uid
The check for wheel membership will be done against the current
uid instead of the original one (useful when jumping with su from
one account to another for example).
The auth and account module types are provided.
PAM_AUTH_ERR
Authentication failure.
PAM_BUF_ERR
Memory buffer error.
PAM_IGNORE
The return value should be ignored by PAM dispatch.
PAM_PERM_DENY
Permission denied.
PAM_SERVICE_ERR
Cannot determine the user name.
PAM_SUCCESS
Success.
PAM_USER_UNKNOWN
User not known.
The root account gains access by default (rootok), only wheel members
can become root (wheel) but Unix authenticate non-root applicants.
su auth sufficient pam_rootok.so
su auth required pam_wheel.so
su auth required pam_unix.so
pam.conf(5), pam.d(5), pam(8)
pam_wheel was written by Cristian Gafton <gafton@redhat.com>.
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
tarball Linux-PAM-1.3.0.tar.gz fetched from
⟨http://www.linux-pam.org/library/⟩ on 2017-07-05. 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 man-pages@man7.org
Linux-PAM Manual 04/19/2016 PAM_WHEEL(8)