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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"
)
// MongoDBAWS is the mechanism name for MongoDBAWS.
const MongoDBAWS = "MONGODB-AWS"
func newMongoDBAWSAuthenticator(cred *Cred) (Authenticator, error) {
if cred.Source != "" && cred.Source != "$external" {
return nil, newAuthError("MONGODB-AWS source must be empty or $external", nil)
}
return &MongoDBAWSAuthenticator{
source: cred.Source,
username: cred.Username,
password: cred.Password,
sessionToken: cred.Props["AWS_SESSION_TOKEN"],
}, nil
}
// MongoDBAWSAuthenticator uses AWS-IAM credentials over SASL to authenticate a connection.
type MongoDBAWSAuthenticator struct {
source string
username string
password string
sessionToken string
}
// Auth authenticates the connection.
func (a *MongoDBAWSAuthenticator) Auth(ctx context.Context, cfg *Config) error {
adapter := &awsSaslAdapter{
conversation: &awsConversation{
username: a.username,
password: a.password,
token: a.sessionToken,
},
}
err := ConductSaslConversation(ctx, cfg, a.source, adapter)
if err != nil {
return newAuthError("sasl conversation error", err)
}
return nil
}
type awsSaslAdapter struct {
conversation *awsConversation
}
var _ SaslClient = (*awsSaslAdapter)(nil)
func (a *awsSaslAdapter) Start() (string, []byte, error) {
step, err := a.conversation.Step(nil)
if err != nil {
return MongoDBAWS, nil, err
}
return MongoDBAWS, step, nil
}
func (a *awsSaslAdapter) Next(challenge []byte) ([]byte, error) {
step, err := a.conversation.Step(challenge)
if err != nil {
return nil, err
}
return step, nil
}
func (a *awsSaslAdapter) Completed() bool {
return a.conversation.Done()
}
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