x509.go

// Copyright (C) MongoDB, Inc. 2017-present.
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may
// not use this file except in compliance with the License. You may obtain
// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0

package auth

import (
	"context"

	"github.com/Vincent20101/mongo-go-driver/bson"
	"github.com/Vincent20101/mongo-go-driver/core/command"
	"github.com/Vincent20101/mongo-go-driver/core/description"
	"github.com/Vincent20101/mongo-go-driver/core/wiremessage"
)

// MongoDBX509 is the mechanism name for MongoDBX509.
const MongoDBX509 = "MONGODB-X509"

func newMongoDBX509Authenticator(cred *Cred) (Authenticator, error) {
	return &MongoDBX509Authenticator{User: cred.Username}, nil
}

// MongoDBX509Authenticator uses X.509 certificates over TLS to authenticate a connection.
type MongoDBX509Authenticator struct {
	User string
}

// Auth implements the Authenticator interface.
func (a *MongoDBX509Authenticator) Auth(ctx context.Context, desc description.Server, rw wiremessage.ReadWriter) error {
	authRequestDoc := bson.NewDocument(
		bson.EC.Int32("authenticate", 1),
		bson.EC.String("mechanism", MongoDBX509),
	)

	if desc.WireVersion.Max < 5 {
		authRequestDoc.Append(bson.EC.String("user", a.User))
	}

	authCmd := command.Read{DB: "$external", Command: authRequestDoc}
	ssdesc := description.SelectedServer{Server: desc}
	_, err := authCmd.RoundTrip(ctx, ssdesc, rw)
	if err != nil {
		return newAuthError("round trip error", err)
	}

	return nil
}