gotosocial/internal/processing/fedi/common.go
kim 42d8011ff4
[chore/security] refactor AuthenticateFederatedRequest() to handle account deref + suspension checks (#2371)
* refactor AuthenticateFederatedRequest() to handle account suspension + fetching of owner

* small fixups

* small changes

* revert to 'IsEitherBlocked' instead of just 'IsBlocked" :grimace:

* update code comment to indicate that AuthenticateFederatedRequest() will handle account + instance dereferencing
2023-11-21 11:35:30 +01:00

75 lines
2.7 KiB
Go

// GoToSocial
// Copyright (C) GoToSocial Authors admin@gotosocial.org
// SPDX-License-Identifier: AGPL-3.0-or-later
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package fedi
import (
"context"
"errors"
"github.com/superseriousbusiness/gotosocial/internal/db"
"github.com/superseriousbusiness/gotosocial/internal/gtserror"
"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
)
func (p *Processor) authenticate(ctx context.Context, requestedUser string) (
*gtsmodel.Account, // requester: i.e. user making the request
*gtsmodel.Account, // receiver: i.e. the receiving inbox user
gtserror.WithCode,
) {
// First get the requested (receiving) LOCAL account with username from database.
receiver, err := p.state.DB.GetAccountByUsernameDomain(ctx, requestedUser, "")
if err != nil {
if !errors.Is(err, db.ErrNoEntries) {
// Real db error.
err = gtserror.Newf("db error getting account %s: %w", requestedUser, err)
return nil, nil, gtserror.NewErrorInternalError(err)
}
// Account just not found in the db.
return nil, nil, gtserror.NewErrorNotFound(err)
}
// Ensure request signed, and use signature URI to
// get requesting account, dereferencing if necessary.
pubKeyAuth, errWithCode := p.federator.AuthenticateFederatedRequest(ctx, requestedUser)
if errWithCode != nil {
return nil, nil, errWithCode
}
if pubKeyAuth.Handshaking {
// This should happen very rarely, we are in the middle of handshaking.
err := gtserror.Newf("network race handshaking %s", pubKeyAuth.OwnerURI)
return nil, nil, gtserror.NewErrorInternalError(err)
}
// Get requester from auth.
requester := pubKeyAuth.Owner
// Check that block does not exist between receiver and requester.
blocked, err := p.state.DB.IsEitherBlocked(ctx, receiver.ID, requester.ID)
if err != nil {
err := gtserror.Newf("error checking block: %w", err)
return nil, nil, gtserror.NewErrorInternalError(err)
} else if blocked {
const text = "block exists between accounts"
return nil, nil, gtserror.NewErrorForbidden(errors.New(text))
}
return requester, receiver, nil
}