解决CentOS 64位系统vsftpd 530 login incorrect的问题

今天在centos 6 64位测试安装vsftpd时发现能正常启动，但用本地用户登录时，发现出现vsftpd 530 login incorrect，出现这种错误会有很多原因。于是开始查看日志/var/log/vsftpd.log，也没发现有价值的信息。再查看/var/log/secure，发现问题了。部分错误代码如下：

Dec 1 08:07:30 localhost vsftpd: PAM adding faulty module: /lib/security/pam_listfile.so
Dec 1 08:07:30 localhost vsftpd: PAM unable to dlopen(/lib/security/pam_unix.so): /lib/security/pam_unix.so: cannot open shared objec
t file: No such file or directory
Dec 1 08:07:30 localhost vsftpd: PAM adding faulty module: /lib/security/pam_unix.so
Dec 1 08:07:30 localhost vsftpd: PAM unable to dlopen(/lib/security/pam_shells.so): /lib/security/pam_shells.so: cannot open shared o
bject file: No such file or directory
Dec 1 08:07:30 localhost vsftpd: PAM adding faulty module: /lib/security/pam_shells.so
Dec 1 08:10:12 localhost vsftpd: PAM unable to dlopen(/lib/security/pam_listfile.so): /lib/security/pam_listfile.so: cannot open shar
ed object file: No such file or directory
Dec 1 08:10:12 localhost vsftpd: PAM adding faulty module: /lib/security/pam_listfile.so
Dec 1 08:10:12 localhost vsftpd: PAM unable to dlopen(/lib/security/pam_unix.so): /lib/security/pam_unix.so: cannot open shared objec
t file: No such file or directory
Dec 1 08:10:12 localhost vsftpd: PAM adding faulty module: /lib/security/pam_unix.so
Dec 1 08:10:12 localhost vsftpd: PAM unable to dlopen(/lib/security/pam_shells.so): /lib/security/pam_shells.so: cannot open shared o
bject file: No such file or directory
Dec 1 08:10:12 localhost vsftpd: PAM adding faulty module: /lib/security/pam_shells.so