post:
  summary: keystone v2认证接口，通过用户名／密码或者token认证
  parameters:
    - name: auth
      in: body
      required: true
      schema:
        type: object
        $ref: "../schemas/auth.yaml#/Auth2Input"
  responses:
    200:
      description: keystone v2认证信息
      schema:
        $ref: "../schemas/auth.yaml#/Auth2Response"
  tags:
    - authentication