CODEWITHSUNDEEP
zeromqzeromq-auth
Antoine Viallon
Antoine Viallon

Reputation: 394

ZeroMQ - Get user ID from ZeroMQ Auth response

In ZeroMQ, more precisely cppzmq in my case, when you use ZAP, it is handled completely transparently for the user.

However, as documented in the RFC: https://rfc.zeromq.org/spec/27/, the Auth server can send back a user ID and some metadata in the response:

The reply message SHALL consist of the following message frames:

  • An address delimiter frame, which SHALL have a length of zero.
  • The version frame, which SHALL contain the three octets “1.0”.
  • The request id, which MAY contain an opaque binary blob.
  • The status code, which SHALL contain a string.
  • The status text, which MAY contain a string.
  • The user id, which SHALL contain a string.
  • The metadata, which MAY contain a blob.

A little bit further down, it precises the meaning of user id:

user id: this MAY provide the user identity in case of a 200 status, for use by applications. For other statuses, it SHALL be empty.

My question is the following: how can you retrieve the user ID from the response with cppzmq?

Small code example to show what I mean:

void client() {
  zmq::context_t context;
  zmq::socket_t socket (context, zmq::socket_type::req);
  socket.set(zmq::sockopt::zap_domain, "global");
  socket.set(zmq::sockopt::plain_username, "user");
  socket.set(zmq::sockopt::plain_password, "password");

  socket.connect("tcp://127.0.0.1:4242");
  ...
  std::string auth_user_id = /* magic function here */;

}

Upvotes: 0

Views: 414

Answers (1)

he shouyong
he shouyong

Reputation: 317

A minimal empty reference implementation is provided in the RFC repository at https://github.com/zeromq/rfc/blob/master/src/spec_27.c. This implementation demonstrates a server talking to a proxy handler over inproc://, talking to an external terminal handler over TCP. The terminal handler implements a PLAIN authentication mechanism.

Upvotes: 1

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