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// 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"
"go.mongodb.org/mongo-driver/mongo/description"
"go.mongodb.org/mongo-driver/x/bsonx/bsoncore"
"go.mongodb.org/mongo-driver/x/mongo/driver"
"go.mongodb.org/mongo-driver/x/mongo/driver/operation"
)
// 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
}
var _ SpeculativeAuthenticator = (*MongoDBX509Authenticator)(nil)
// x509 represents a X509 authentication conversation. This type implements the SpeculativeConversation interface so the
// conversation can be executed in multi-step speculative fashion.
type x509Conversation struct{}
var _ SpeculativeConversation = (*x509Conversation)(nil)
// FirstMessage returns the first message to be sent to the server.
func (c *x509Conversation) FirstMessage() (bsoncore.Document, error) {
return createFirstX509Message(description.Server{}, ""), nil
}
// createFirstX509Message creates the first message for the X509 conversation.
func createFirstX509Message(desc description.Server, user string) bsoncore.Document {
elements := [][]byte{
bsoncore.AppendInt32Element(nil, "authenticate", 1),
bsoncore.AppendStringElement(nil, "mechanism", MongoDBX509),
}
// Server versions < 3.4 require the username to be included in the message. Versions >= 3.4 will extract the
// username from the certificate.
if desc.WireVersion != nil && desc.WireVersion.Max < 5 {
elements = append(elements, bsoncore.AppendStringElement(nil, "user", user))
}
return bsoncore.BuildDocument(nil, elements...)
}
// Finish implements the SpeculativeConversation interface and is a no-op because an X509 conversation only has one
// step.
func (c *x509Conversation) Finish(context.Context, *Config, bsoncore.Document) error {
return nil
}
// CreateSpeculativeConversation creates a speculative conversation for X509 authentication.
func (a *MongoDBX509Authenticator) CreateSpeculativeConversation() (SpeculativeConversation, error) {
return &x509Conversation{}, nil
}
// Auth authenticates the provided connection by conducting an X509 authentication conversation.
func (a *MongoDBX509Authenticator) Auth(ctx context.Context, cfg *Config) error {
requestDoc := createFirstX509Message(cfg.Description, a.User)
authCmd := operation.
NewCommand(requestDoc).
Database("$external").
Deployment(driver.SingleConnectionDeployment{cfg.Connection}).
ClusterClock(cfg.ClusterClock).
ServerAPI(cfg.ServerAPI)
err := authCmd.Execute(ctx)
if err != nil {
return newAuthError("round trip error", err)
}
return nil
}
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