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// 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"
"net/url"
"code.superseriousbusiness.org/gotosocial/internal/db"
"code.superseriousbusiness.org/gotosocial/internal/gtserror"
"code.superseriousbusiness.org/gotosocial/internal/gtsmodel"
)
type commonAuth struct {
handshakingURI *url.URL // Set to requestingAcct's URI if we're currently handshaking them.
requester *gtsmodel.Account // Remote account making request to this instance.
receiver *gtsmodel.Account // Local account receiving the request.
}
// authenticate is a util function for authenticating a signed GET
// request to one of the AP/fedi resources handled in this package.
func (p *Processor) authenticate(ctx context.Context, requestedUser string) (*commonAuth, gtserror.WithCode) {
// Get the requested local account
// with given username from database.
receiver, err := p.state.DB.GetAccountByUsernameDomain(ctx, requestedUser, "")
if err != nil && !errors.Is(err, db.ErrNoEntries) {
err = gtserror.Newf("db error getting account %s: %w", requestedUser, err)
return nil, gtserror.NewErrorInternalError(err)
}
if receiver == nil {
err := gtserror.Newf("account %s not found in the db", requestedUser)
return 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, errWithCode
}
if pubKeyAuth.Handshaking {
// We're still handshaking so we
// don't know the requester yet.
return &commonAuth{
handshakingURI: pubKeyAuth.OwnerURI,
receiver: receiver,
}, nil
}
// Get requester from auth.
requester := pubKeyAuth.Owner
// Check if requester is suspended.
switch {
case !requester.IsSuspended():
// No problem.
case requester.DeletedSelf():
// Requester deleted their own account.
// Why are they now requesting something?
err := gtserror.Newf("requester %s self-deleted", requester.UsernameDomain())
return nil, gtserror.NewErrorUnauthorized(err)
default:
// Admin from our instance likely suspended account.
err := gtserror.Newf("requester %s is suspended", requester.UsernameDomain())
return nil, gtserror.NewErrorForbidden(err)
}
// Ensure receiver does not block requester.
blocked, err := p.state.DB.IsBlocked(ctx, receiver.ID, requester.ID)
if err != nil {
err := gtserror.Newf("db error checking block: %w", err)
return nil, gtserror.NewErrorInternalError(err)
}
if blocked {
var text = requestedUser + " blocks " + requester.Username
return nil, gtserror.NewErrorForbidden(errors.New(text))
}
return &commonAuth{
requester: requester,
receiver: receiver,
}, nil
}
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