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
Print debug information.
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
Instead of checking the wheel or GID 0 groups, use the name
group to perform the authentication.
The check for wheel membership is done only when the target
user UID is 0.
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).
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).
Memory buffer error.
The return value should be ignored by PAM dispatch.
Cannot determine the user name.
User not known.
The root account gains access by default (rootok), only wheel
members can become root (wheel) but Unix authenticate non-root
su auth sufficient pam_rootok.so
su auth required pam_wheel.so
su auth required pam_unix.so
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.bz2 fetched from
⟨http://www.linux-pam.org/library/⟩ on 2020-12-18. 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@example.com
Linux-PAM Manual 04/19/2016 PAM_WHEEL(8)