/
authenticate.go
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/
authenticate.go
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// Copyright 2021 FerretDB Inc.
//
// 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
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package handler
import (
"context"
"errors"
"github.com/FerretDB/FerretDB/internal/clientconn/conninfo"
"github.com/FerretDB/FerretDB/internal/handler/common"
"github.com/FerretDB/FerretDB/internal/handler/handlererrors"
"github.com/FerretDB/FerretDB/internal/types"
"github.com/FerretDB/FerretDB/internal/util/iterator"
"github.com/FerretDB/FerretDB/internal/util/lazyerrors"
"github.com/FerretDB/FerretDB/internal/util/must"
"github.com/FerretDB/FerretDB/internal/util/password"
)
// authenticate validates users with stored credentials in admin.systems.user.
// If EnableNewAuth is false or bypass backend auth is set false, it succeeds
// authentication and let backend handle it.
//
// When admin.systems.user contains no user, and the client is connected from
// the localhost, it bypasses credentials check.
func (h *Handler) authenticate(ctx context.Context) error {
if !h.EnableNewAuth {
return nil
}
conninfo.Get(ctx).SetBypassBackendAuth()
adminDB, err := h.b.Database("admin")
if err != nil {
return lazyerrors.Error(err)
}
usersCol, err := adminDB.Collection("system.users")
if err != nil {
return lazyerrors.Error(err)
}
username, userPassword, mechanism := conninfo.Get(ctx).Auth()
switch mechanism {
case "SCRAM-SHA-256", "SCRAM-SHA-1":
// SCRAM calls back scramCredentialLookup each time Step is called,
// and that checks the authentication.
return nil
case "PLAIN":
break
default:
return lazyerrors.Errorf("Unsupported authentication mechanism %q", mechanism)
}
// For `PLAIN` mechanism $db field is always `$external` upon saslStart.
// For `SCRAM-SHA-1` and `SCRAM-SHA-256` mechanisms $db field contains
// authSource option of the client.
// Let authorization handle the database access right.
// TODO https://github.com/FerretDB/FerretDB/issues/174
filter := must.NotFail(types.NewDocument("user", username))
qr, err := usersCol.Query(ctx, nil)
if err != nil {
return lazyerrors.Error(err)
}
defer qr.Iter.Close()
var storedUser *types.Document
var hasUser bool
for {
var v *types.Document
_, v, err = qr.Iter.Next()
if errors.Is(err, iterator.ErrIteratorDone) {
break
}
if err != nil {
return lazyerrors.Error(err)
}
hasUser = true
var matches bool
if matches, err = common.FilterDocument(v, filter); err != nil {
return lazyerrors.Error(err)
}
if matches {
storedUser = v
break
}
}
if !hasUser && conninfo.Get(ctx).LocalPeer() {
return nil
}
if storedUser == nil {
return handlererrors.NewCommandErrorMsgWithArgument(
handlererrors.ErrAuthenticationFailed,
"Authentication failed",
"authenticate",
)
}
credentials := must.NotFail(storedUser.Get("credentials")).(*types.Document)
v, _ := credentials.Get("PLAIN")
if v == nil {
return handlererrors.NewCommandErrorMsgWithArgument(
handlererrors.ErrMechanismUnavailable,
"Unable to use PLAIN based authentication for user without any PLAIN credentials registered",
"authenticate",
)
}
doc, ok := v.(*types.Document)
if !ok {
return lazyerrors.Errorf("field 'PLAIN' has type %T, expected Document", v)
}
err = password.PlainVerify(userPassword, doc)
if err != nil {
return handlererrors.NewCommandErrorMsgWithArgument(
handlererrors.ErrAuthenticationFailed,
"Authentication failed",
"authenticate",
)
}
return nil
}