1.需要修改配置文件，添加如下内容：
  username-as-common-name
  script-security 3
  auth-user-pass-verify /etc/open***/ldap_auth.py  via-env
  verify-client-cert  none
  
2.编写脚本内容如下：
    ######################################
    #!/usr/bin/env python
    # -*- coding: utf-8 -*-
    
    import os,sys
    from ldap3 import Connection
    
    class LdapOp(object):
    
        def __init__(self,ip,dn):
            self._ip = ip
            self.dn = dn
        def authUser(self,username,password):
            try:
                cn = 'uid=%s,ou=People,%s' % (username,self.dn)
                conn2 = Connection(self._ip, user=cn, password=password,
                                   check_names=True, lazy=False, raise_exceptions=False)
                conn2.bind()
                if conn2.result["description"] == "success":
                    rv = 0
                else:
                    rv = 1
            except Exception as e:
                rv = 1
            finally:
                return rv
    
    if __name__ == '__main__':
        server_ip = '192.168.60.227'
        dn = 'dc=test,dc=cn'
        username = os.environ.get('username')
        password = os.environ.get('password')
        ldap = LdapOp(server_ip,dn)
        rv = ldap.authUser(username,password)
        sys.exit(rv)