86 lines
3.0 KiB
Go
86 lines
3.0 KiB
Go
// Copyright (C) MongoDB, Inc. 2017-present.
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//
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// Licensed under the Apache License, Version 2.0 (the "License"); you may
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// not use this file except in compliance with the License. You may obtain
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// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
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package auth
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import (
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"context"
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"go.mongodb.org/mongo-driver/mongo/description"
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"go.mongodb.org/mongo-driver/x/bsonx/bsoncore"
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"go.mongodb.org/mongo-driver/x/mongo/driver"
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"go.mongodb.org/mongo-driver/x/mongo/driver/operation"
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)
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// MongoDBX509 is the mechanism name for MongoDBX509.
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const MongoDBX509 = "MONGODB-X509"
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func newMongoDBX509Authenticator(cred *Cred) (Authenticator, error) {
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return &MongoDBX509Authenticator{User: cred.Username}, nil
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}
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// MongoDBX509Authenticator uses X.509 certificates over TLS to authenticate a connection.
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type MongoDBX509Authenticator struct {
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User string
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}
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var _ SpeculativeAuthenticator = (*MongoDBX509Authenticator)(nil)
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// x509 represents a X509 authentication conversation. This type implements the SpeculativeConversation interface so the
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// conversation can be executed in multi-step speculative fashion.
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type x509Conversation struct{}
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var _ SpeculativeConversation = (*x509Conversation)(nil)
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// FirstMessage returns the first message to be sent to the server.
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func (c *x509Conversation) FirstMessage() (bsoncore.Document, error) {
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return createFirstX509Message(description.Server{}, ""), nil
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}
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// createFirstX509Message creates the first message for the X509 conversation.
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func createFirstX509Message(desc description.Server, user string) bsoncore.Document {
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elements := [][]byte{
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bsoncore.AppendInt32Element(nil, "authenticate", 1),
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bsoncore.AppendStringElement(nil, "mechanism", MongoDBX509),
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}
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// Server versions < 3.4 require the username to be included in the message. Versions >= 3.4 will extract the
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// username from the certificate.
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if desc.WireVersion != nil && desc.WireVersion.Max < 5 {
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elements = append(elements, bsoncore.AppendStringElement(nil, "user", user))
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}
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return bsoncore.BuildDocument(nil, elements...)
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}
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// Finish implements the SpeculativeConversation interface and is a no-op because an X509 conversation only has one
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// step.
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func (c *x509Conversation) Finish(context.Context, *Config, bsoncore.Document) error {
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return nil
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}
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// CreateSpeculativeConversation creates a speculative conversation for X509 authentication.
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func (a *MongoDBX509Authenticator) CreateSpeculativeConversation() (SpeculativeConversation, error) {
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return &x509Conversation{}, nil
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}
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// Auth authenticates the provided connection by conducting an X509 authentication conversation.
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func (a *MongoDBX509Authenticator) Auth(ctx context.Context, cfg *Config) error {
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requestDoc := createFirstX509Message(cfg.Description, a.User)
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authCmd := operation.
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NewCommand(requestDoc).
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Database("$external").
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Deployment(driver.SingleConnectionDeployment{cfg.Connection}).
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ClusterClock(cfg.ClusterClock).
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ServerAPI(cfg.ServerAPI)
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err := authCmd.Execute(ctx)
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if err != nil {
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return newAuthError("round trip error", err)
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}
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return nil
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}
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