/etc/pam.d/login /etc/pam.d/passwd /etc/pam.d/su /etc/pam.d/shadow /etc/pam.d/useradd Add the following PAM configuration files to /etc/pam.d (or add them to /etc/pam.conf with the additional field for the program). cat > /etc/pam.d/login << "EOF" # Begin /etc/pam.d/login auth requisite pam_securetty.so auth requisite pam_nologin.so auth required pam_env.so auth required pam_unix.so account required pam_access.so account required pam_unix.so session required pam_motd.so session required pam_limits.so session optional pam_mail.so dir=/var/mail standard session optional pam_lastlog.so session required pam_unix.so # End /etc/pam.d/login EOF cat > /etc/pam.d/passwd << "EOF" # Begin /etc/pam.d/passwd password required pam_unix.so md5 shadow # End /etc/pam.d/passwd EOF cat > /etc/pam.d/shadow << "EOF" # Begin /etc/pam.d/shadow auth sufficient pam_rootok.so auth required pam_unix.so account required pam_unix.so session required pam_unix.so password required pam_permit.so # End /etc/pam.d/shadow EOF cat > /etc/pam.d/su << "EOF" # Begin /etc/pam.d/su auth sufficient pam_rootok.so auth required pam_unix.so account required pam_unix.so session required pam_unix.so # End /etc/pam.d/su EOF cat > /etc/pam.d/useradd << "EOF" # Begin /etc/pam.d/useradd auth sufficient pam_rootok.so auth required pam_unix.so account required pam_unix.so session required pam_unix.so password required pam_permit.so # End /etc/pam.d/useradd EOF Currently, /etc/pam.d/other is configured to allow anyone with an account on the machine to use programs that do not specifically have a configuration file of their own. After testing PAM for proper configuration, it can be changed to the following: cat > /etc/pam.d/other << "EOF" # Begin /etc/pam.d/other auth required pam_deny.so auth required pam_warn.so account required pam_deny.so session required pam_deny.so password required pam_deny.so password required pam_warn.so # End /etc/pam.d/other EOF Finally, edit /etc/login.defs by adding '#' to the beginning of the following lines: DIALUPS_CHECK_ENAB LASTLOG_ENAB MAIL_CHECK_ENAB PORTTIME_CHECKS_ENAB CONSOLE MOTD_FILE NOLOGINS_FILE PASS_MIN_LEN SU_WHEEL_ONLY MD5_CRYPT_ENAB CONSOLE_GROUPS ENVIRON_FILE This stops login from performing these functions, as they will now be performed by PAM modules.