NAMEpam_wheel - Only permit root access to members of group wheel
SYNOPSISpam_wheel.so [debug] [deny] [group=name] [root_only] [trust]
DESCRIPTIONThe 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.
OPTIONSdebug 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. 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).
MODULE TYPES PROVIDEDThe auth and account module types are provided.
RETURN VALUESPAM_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.
EXAMPLESThe 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
SEE ALSOpam.conf(5), pam.d(5), pam(7)
AUTHORpam_wheel was written by Cristian Gafton <email@example.com>. PAM_WHEEL(8)