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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"
"fmt"
"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.
requestingAcct *gtsmodel.Account // Remote account making request to this instance.
receivingAcct *gtsmodel.Account // Local account receiving the request.
}
func (p *Processor) authenticate(ctx context.Context, requestedUser string) (*commonAuth, 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, gtserror.NewErrorInternalError(err)
}
// Account just not found in the db.
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,
receivingAcct: receiver,
}, nil
}
// Get requester from auth.
requester := pubKeyAuth.Owner
// Ensure 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, gtserror.NewErrorInternalError(err)
} else if blocked {
const text = "block exists between accounts"
return nil, gtserror.NewErrorForbidden(errors.New(text))
}
return &commonAuth{
requestingAcct: requester,
receivingAcct: receiver,
}, nil
}
// validateIntReqRequest is a shortcut function
// for returning an accepted interaction request
// targeting `requestedUser`.
func (p *Processor) validateIntReqRequest(
ctx context.Context,
requestedUser string,
intReqID string,
) (*gtsmodel.InteractionRequest, gtserror.WithCode) {
// Authenticate incoming request, getting related accounts.
auth, errWithCode := p.authenticate(ctx, requestedUser)
if errWithCode != nil {
return nil, errWithCode
}
if auth.handshakingURI != nil {
// We're currently handshaking, which means we don't know
// this account yet. This should be a very rare race condition.
err := gtserror.Newf("network race handshaking %s", auth.handshakingURI)
return nil, gtserror.NewErrorInternalError(err)
}
// Fetch interaction request with the given ID.
req, err := p.state.DB.GetInteractionRequestByID(ctx, intReqID)
if err != nil && !errors.Is(err, db.ErrNoEntries) {
err := gtserror.Newf("db error getting interaction request %s: %w", intReqID, err)
return nil, gtserror.NewErrorInternalError(err)
}
// Ensure that this is an existing
// and *accepted* interaction request.
if req == nil || !req.IsAccepted() {
const text = "interaction request not found"
return nil, gtserror.NewErrorNotFound(errors.New(text))
}
// Ensure interaction request was accepted
// by the account in the request path.
if req.TargetAccountID != auth.receivingAcct.ID {
text := fmt.Sprintf(
"account %s is not targeted by interaction request %s and therefore can't accept it",
requestedUser, intReqID,
)
return nil, gtserror.NewErrorNotFound(errors.New(text))
}
// All fine.
return req, nil
}
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