... auth required /lib /security/ pam_securetty.so auth sufficient /lib /security/ pam_rhosts_auth.so auth required /lib /security/ pam_stack.so service=system-auth auth required /lib /security/ pam_nologin.so ... /lib /security/ pam_nologin.so account required /lib /security/ pam_stack.so service=system-auth password required /lib /security/ pam_stack.so service=system-auth session required /lib /security/ pam_stack.so service=system-auth ... passwd, sshd, vsftp, …) - Thư viện module lưu /lib /security ( pam_chroot.so, pam_access.so, pam_rootok.so, pam_deny.so, … ) - Các file cấu hình lưu /etc /security ( access.conf, chroot.conf, group.conf...