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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"
"fmt"
"io"
// Ignore gosec warning "Blocklisted import crypto/md5: weak cryptographic primitive". We need
// to use MD5 here to implement the MONGODB-CR specification.
/* #nosec G501 */
"crypto/md5"
"go.mongodb.org/mongo-driver/bson"
"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"
)
// MONGODBCR is the mechanism name for MONGODB-CR.
//
// The MONGODB-CR authentication mechanism is deprecated in MongoDB 3.6 and removed in
// MongoDB 4.0.
const MONGODBCR = "MONGODB-CR"
func newMongoDBCRAuthenticator(cred *Cred) (Authenticator, error) {
return &MongoDBCRAuthenticator{
DB: cred.Source,
Username: cred.Username,
Password: cred.Password,
}, nil
}
// MongoDBCRAuthenticator uses the MONGODB-CR algorithm to authenticate a connection.
//
// The MONGODB-CR authentication mechanism is deprecated in MongoDB 3.6 and removed in
// MongoDB 4.0.
type MongoDBCRAuthenticator struct {
DB string
Username string
Password string
}
// Auth authenticates the connection.
//
// The MONGODB-CR authentication mechanism is deprecated in MongoDB 3.6 and removed in
// MongoDB 4.0.
func (a *MongoDBCRAuthenticator) Auth(ctx context.Context, cfg *Config) error {
db := a.DB
if db == "" {
db = defaultAuthDB
}
doc := bsoncore.BuildDocumentFromElements(nil, bsoncore.AppendInt32Element(nil, "getnonce", 1))
cmd := operation.NewCommand(doc).
Database(db).
Deployment(driver.SingleConnectionDeployment{cfg.Connection}).
ClusterClock(cfg.ClusterClock).
ServerAPI(cfg.ServerAPI)
err := cmd.Execute(ctx)
if err != nil {
return newError(err, MONGODBCR)
}
rdr := cmd.Result()
var getNonceResult struct {
Nonce string `bson:"nonce"`
}
err = bson.Unmarshal(rdr, &getNonceResult)
if err != nil {
return newAuthError("unmarshal error", err)
}
doc = bsoncore.BuildDocumentFromElements(nil,
bsoncore.AppendInt32Element(nil, "authenticate", 1),
bsoncore.AppendStringElement(nil, "user", a.Username),
bsoncore.AppendStringElement(nil, "nonce", getNonceResult.Nonce),
bsoncore.AppendStringElement(nil, "key", a.createKey(getNonceResult.Nonce)),
)
cmd = operation.NewCommand(doc).
Database(db).
Deployment(driver.SingleConnectionDeployment{cfg.Connection}).
ClusterClock(cfg.ClusterClock).
ServerAPI(cfg.ServerAPI)
err = cmd.Execute(ctx)
if err != nil {
return newError(err, MONGODBCR)
}
return nil
}
func (a *MongoDBCRAuthenticator) createKey(nonce string) string {
// Ignore gosec warning "Use of weak cryptographic primitive". We need to use MD5 here to
// implement the MONGODB-CR specification.
/* #nosec G401 */
h := md5.New()
_, _ = io.WriteString(h, nonce)
_, _ = io.WriteString(h, a.Username)
_, _ = io.WriteString(h, mongoPasswordDigest(a.Username, a.Password))
return fmt.Sprintf("%x", h.Sum(nil))
}
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