Gain only root access
' pam_rootok.so 'u pam_rootok.so [debug]
pam_rootok is a PAM module that authenticates the user if their UID is 0 . Applications that are created setuid -root generally retain the UID of the user but run with the authority of an enhanced effective -UID . It is the real UID that is checked .
debug Print debug information .
The auth , acct and password module types are provided .
PAM_SUCCESS The UID is 0 .
PAM_AUTH_ERR The UID is not 0 .
In the case of the su (1) application the historical usage is to permit the superuser to adopt the identity of a lesser user without the use of a password . To obtain this behavior with PAM the following pair of lines are needed for the corresponding entry in the /etc/pam .d/su configuration file:.RS 4
# su authentication . Root is granted access by default . auth sufficient pam_rootok .so auth required pam_unix .so
su(1), pam.conf(5), pam.d(5), pam(8)
pam_rootok was written by Andrew G . Morgan, <morgan@kernel .org> .