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Allow properly editing pending encrypted messages

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This commit is contained in:
Nicolas Werner 2022-02-27 06:41:48 +01:00
parent 9f5b647fb3
commit 8e20139079
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GPG key ID: C8D75E610773F2D9
4 changed files with 96 additions and 30 deletions
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38
src/encryption/Olm.cpp
View file

@ -470,6 +470,30 @@ handle_pre_key_olm_message(const std::string &sender,
return plaintext;
}
mtx::events::msg::Encrypted
encrypt_group_message_with_session(mtx::crypto::OutboundGroupSessionPtr &session,
const std::string &device_id,
nlohmann::json body)
{
using namespace mtx::events;
// relations shouldn't be encrypted...
mtx::common::Relations relations = mtx::common::parse_relations(body["content"]);
auto payload = olm::client()->encrypt_group_message(session.get(), body.dump());
// Prepare the m.room.encrypted event.
msg::Encrypted data;
data.ciphertext = std::string((char *)payload.data(), payload.size());
data.sender_key = olm::client()->identity_keys().curve25519;
data.session_id = mtx::crypto::session_id(session.get());
data.device_id = device_id;
data.algorithm = MEGOLM_ALGO;
data.relations = relations;
return data;
}
mtx::events::msg::Encrypted
encrypt_group_message(const std::string &room_id, const std::string &device_id, nlohmann::json body)
{
@ -631,19 +655,7 @@ encrypt_group_message(const std::string &room_id, const std::string &device_id,
if (!sendSessionTo.empty())
olm::send_encrypted_to_device_messages(sendSessionTo, megolm_payload);
// relations shouldn't be encrypted...
mtx::common::Relations relations = mtx::common::parse_relations(body["content"]);
auto payload = olm::client()->encrypt_group_message(session.get(), body.dump());
// Prepare the m.room.encrypted event.
msg::Encrypted data;
data.ciphertext = std::string((char *)payload.data(), payload.size());
data.sender_key = olm::client()->identity_keys().curve25519;
data.session_id = mtx::crypto::session_id(session.get());
data.device_id = device_id;
data.algorithm = MEGOLM_ALGO;
data.relations = relations;
auto data = encrypt_group_message_with_session(session, device_id, body);
group_session_data.message_index = olm_outbound_group_session_message_index(session.get());
nhlog::crypto()->debug("next message_index {}", group_session_data.message_index);

5
src/encryption/Olm.h
View file

@ -79,6 +79,11 @@ handle_pre_key_olm_message(const std::string &sender,
const std::string &sender_key,
const mtx::events::msg::OlmCipherContent &content);
mtx::events::msg::Encrypted
encrypt_group_message_with_session(mtx::crypto::OutboundGroupSessionPtr &session,
const std::string &device_id,
nlohmann::json body);
mtx::events::msg::Encrypted
encrypt_group_message(const std::string &room_id,
const std::string &device_id,

54
src/timeline/EventStore.cpp
View file

@ -184,11 +184,21 @@ EventStore::EventStore(std::string room_id, QObject *)
// Replace the event_id in pending edits/replies/redactions with the actual
// event_id of this event. This allows one to edit and reply to events that are
// currently pending.
// FIXME (introduced by balsoft): this doesn't work for encrypted events, but
// allegedly it's hard to fix so I'll leave my first contribution at that
for (const auto &pending_event_id : cache::client()->pendingEvents(room_id_)) {
if (auto pending_event = cache::client()->getEvent(room_id_, pending_event_id)) {
bool was_encrypted = false;
mtx::events::EncryptedEvent<mtx::events::msg::Encrypted> original_encrypted;
if (auto encrypted =
std::get_if<mtx::events::EncryptedEvent<mtx::events::msg::Encrypted>>(
&pending_event->data)) {
auto d_event = decryptEvent({room_id_, encrypted->event_id}, *encrypted);
if (d_event->event) {
was_encrypted = true;
original_encrypted = *encrypted;
pending_event->data = *d_event->event;
}
}
auto relations = mtx::accessors::relations(pending_event->data);
// Replace the blockquote in fallback reply
@ -202,13 +212,49 @@ EventStore::EventStore(std::string room_id, QObject *)
}
}
bool replaced_txn = false;
for (mtx::common::Relation &rel : relations.relations) {
if (rel.event_id == txn_id)
if (rel.event_id == txn_id) {
rel.event_id = event_id;
replaced_txn = true;
}
}
if (!replaced_txn)
continue;
mtx::accessors::set_relations(pending_event->data, std::move(relations));
// reencrypt. This is a bit of a hack and might make people able to read the
// message, that were in the room at the time of sending the last pending message.
// That window is pretty small though, so it should be good enough. We also just
// fail, if there was no session. But there SHOULD always be one. Let's wait until
// I am proven wrong :3
if (was_encrypted) {
auto session = cache::getOutboundMegolmSession(room_id_);
if (!session.session)
continue;
std::visit(
[&pending_event, &original_encrypted, &session, this](auto &msg) {
json doc = {{"type", mtx::events::to_string(msg.type)},
{"content", json(msg.content)},
{"room_id", room_id_}};
auto data = olm::encrypt_group_message_with_session(
session.session, http::client()->device_id(), doc);
session.data.message_index =
olm_outbound_group_session_message_index(session.session.get());
cache::updateOutboundMegolmSession(
room_id_, session.data, session.session);
original_encrypted.content = data;
pending_event->data = original_encrypted;
},
pending_event->data);
}
cache::client()->replaceEvent(room_id_, pending_event_id, *pending_event);
auto idx = idToIndex(pending_event_id);

7
src/timeline/TimelineModel.cpp
View file

@ -423,7 +423,8 @@ TimelineModel::TimelineModel(TimelineViewManager *manager, QString room_id, QObj
// When a message is sent, check if the current edit/reply relates to that message,
// and update the event_id so that it points to the sent message and not the pending one.
connect(&events,
connect(
&events,
&EventStore::messageSent,
this,
[this](const std::string &txn_id, const std::string &event_id) {
@ -431,11 +432,13 @@ TimelineModel::TimelineModel(TimelineViewManager *manager, QString room_id, QObj
edit_ = QString::fromStdString(event_id);
emit editChanged(edit_);
}
nhlog::net()->debug("reply {}\ntxn {}\nev {}", reply_.toStdString(), txn_id, event_id);
if (reply_.toStdString() == txn_id) {
reply_ = QString::fromStdString(event_id);
emit replyChanged(reply_);
}
});
},
Qt::QueuedConnection);
connect(
manager_, &TimelineViewManager::initialSyncChanged, &events, &EventStore::enableKeyRequests);