https://www.cnblogs.com/phpliu/archive/2013/09/24/3336713.html
Okami: http://seanlook.com/2015/01/22/openldap_ldif_example/
Xiao Shen: https://blog.csdn.net/jiujiuming/article/details/70057904
Configuration: http://www.micmiu.com/enterprise-app/sso/openldap-windows-config/
Error summary: https://blog.csdn.net/zdwzzu2006/article/details/8550910