NAMEpam_wheel - Only permit root access to members of group wheel
- pam_wheel.so [debug] [deny] [group=name] [root_only] [trust] [use_uid]
- 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 PAM_SUCCESS).
- Instead of checking the wheel or GID 0 groups, use the name group to perform the authentification.
- The check for wheel membership is done only.
- 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).
MODULE SERVICES PROVIDED
- Authentication failure.
- Memory buffer error.
- The return value should be ignored by PAM dispatch.
- Permission denied.
- 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 applicants.
su auth sufficient pam_rootok.so su auth required pam_wheel.so su auth required pam_unix.so
pam_wheel was written by Cristian Gafton <email@example.com>.