我现在正在使用Red Hat 6.6，尝试为root用户强制实施密码策略。我的/etc/pam.d/system-auth文件包含以下行：
#%PAM-1.0
# This file is auto-generated.
# User changes will be destroyed the next time authconfig is run.
auth required pam_env.so
auth sufficient pam_fprintd.so
auth required pam_tally2.so deny=5 unlock_time=900
auth sufficient pam_unix.so nullok try_first_pass
auth requisite pam_succeed_if.so uid >= 500 quiet
auth required pam_deny.so
account required pam_tally2.so
account required pam_unix.so
account sufficient pam_localuser.so
account sufficient pam_succeed_if.so uid < 500 quiet
account required pam_permit.so
password requisite pam_cracklib.so try_first_pass retry=3 type= ucredit=-1 lcredit=-1 dcredit=-1 ocredit=-1 maxrepeat=3 \
reject_username enforce_for_root
password sufficient /lib64/security/pam_unix.so sha512 shadow nullok remember=5 use_authtok
password required pam_deny.so
session optional pam_keyinit.so revoke
session required pam_limits.so
session [success=1 default=ignore] pam_succeed_if.so service in crond quiet use_uid
session required pam_unix.so
适用于passwd命令，当我尝试将密码更改为简单（如'123'）时，它不接受密码。
但是当我试图通过GUI（gnome2，system-config-users实用程序）进行更改时，它只会抛出有关密码错误的警告，无论如何我都可以应用弱密码。
如何通过GUI拒绝设置弱密码？