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mongodbcr.go
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mongodbcr.go
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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"
"crypto/md5"
"fmt"
"io"
"github.com/mongodb/mongo-go-driver/bson"
"github.com/mongodb/mongo-go-driver/x/bsonx"
"github.com/mongodb/mongo-go-driver/x/network/command"
"github.com/mongodb/mongo-go-driver/x/network/description"
"github.com/mongodb/mongo-go-driver/x/network/wiremessage"
)
// MONGODBCR is the mechanism name for MONGODB-CR.
//
// The MONGODB-CR authentication mechanism is deprecated 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 4.0.
type MongoDBCRAuthenticator struct {
DB string
Username string
Password string
}
// Auth authenticates the connection.
//
// The MONGODB-CR authentication mechanism is deprecated in MongoDB 4.0.
func (a *MongoDBCRAuthenticator) Auth(ctx context.Context, desc description.Server, rw wiremessage.ReadWriter) error {
// Arbiters cannot be authenticated
if desc.Kind == description.RSArbiter {
return nil
}
db := a.DB
if db == "" {
db = defaultAuthDB
}
cmd := command.Read{DB: db, Command: bsonx.Doc{{"getnonce", bsonx.Int32(1)}}}
ssdesc := description.SelectedServer{Server: desc}
rdr, err := cmd.RoundTrip(ctx, ssdesc, rw)
if err != nil {
return newError(err, MONGODBCR)
}
var getNonceResult struct {
Nonce string `bson:"nonce"`
}
err = bson.Unmarshal(rdr, &getNonceResult)
if err != nil {
return newAuthError("unmarshal error", err)
}
cmd = command.Read{
DB: db,
Command: bsonx.Doc{
{"authenticate", bsonx.Int32(1)},
{"user", bsonx.String(a.Username)},
{"nonce", bsonx.String(getNonceResult.Nonce)},
{"key", bsonx.String(a.createKey(getNonceResult.Nonce))},
},
}
_, err = cmd.RoundTrip(ctx, ssdesc, rw)
if err != nil {
return newError(err, MONGODBCR)
}
return nil
}
func (a *MongoDBCRAuthenticator) createKey(nonce string) string {
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))
}