diff --git a/src/Olm.cpp b/src/Olm.cpp
index f39554f0..814fce18 100644
--- a/src/Olm.cpp
+++ b/src/Olm.cpp
@@ -55,10 +55,21 @@ handle_olm_message(const OlmMessage &msg)
const auto type = cipher.second.type;
nhlog::crypto()->info("type: {}", type == 0 ? "OLM_PRE_KEY" : "OLM_MESSAGE");
- if (type == OLM_MESSAGE_TYPE_PRE_KEY)
- handle_pre_key_olm_message(msg.sender, msg.sender_key, cipher.second);
- else
- handle_olm_normal_message(msg.sender, msg.sender_key, cipher.second);
+ auto payload = try_olm_decryption(msg.sender_key, cipher.second);
+
+ if (payload) {
+ nhlog::crypto()->info("decrypted olm payload: {}", payload.value().dump(2));
+ create_inbound_megolm_session(msg.sender, msg.sender_key, payload.value());
+ return;
+ }
+
+ // Not a PRE_KEY message
+ if (cipher.second.type != 0) {
+ // TODO: log that it should have matched something
+ return;
+ }
+
+ handle_pre_key_olm_message(msg.sender, msg.sender_key, cipher.second);
}
}
@@ -72,6 +83,10 @@ handle_pre_key_olm_message(const std::string &sender,
OlmSessionPtr inbound_session = nullptr;
try {
inbound_session = olm::client()->create_inbound_session(content.body);
+
+ // We also remove the one time key used to establish that
+ // session so we'll have to update our copy of the account object.
+ cache::client()->saveOlmAccount(olm::client()->save("secret"));
} catch (const olm_exception &e) {
nhlog::crypto()->critical(
"failed to create inbound session with {}: {}", sender, e.what());
@@ -86,8 +101,8 @@ handle_pre_key_olm_message(const std::string &sender,
mtx::crypto::BinaryBuf output;
try {
- output = olm::client()->decrypt_message(
- inbound_session.get(), OLM_MESSAGE_TYPE_PRE_KEY, content.body);
+ output =
+ olm::client()->decrypt_message(inbound_session.get(), content.type, content.body);
} catch (const olm_exception &e) {
nhlog::crypto()->critical(
"failed to decrypt olm message {}: {}", content.body, e.what());
@@ -97,45 +112,14 @@ handle_pre_key_olm_message(const std::string &sender,
auto plaintext = json::parse(std::string((char *)output.data(), output.size()));
nhlog::crypto()->info("decrypted message: \n {}", plaintext.dump(2));
- std::string room_id, session_id, session_key;
try {
- room_id = plaintext.at("content").at("room_id");
- session_id = plaintext.at("content").at("session_id");
- session_key = plaintext.at("content").at("session_key");
- } catch (const nlohmann::json::exception &e) {
- nhlog::crypto()->critical(
- "failed to parse plaintext olm message: {} {}", e.what(), plaintext.dump(2));
- return;
+ cache::client()->saveOlmSession(sender_key, std::move(inbound_session));
+ } catch (const lmdb::error &e) {
+ nhlog::db()->warn(
+ "failed to save inbound olm session from {}: {}", sender, e.what());
}
- MegolmSessionIndex index;
- index.room_id = room_id;
- index.session_id = session_id;
- index.sender_key = sender_key;
-
- if (!cache::client()->inboundMegolmSessionExists(index)) {
- auto megolm_session = olm::client()->init_inbound_group_session(session_key);
-
- try {
- cache::client()->saveInboundMegolmSession(index, std::move(megolm_session));
- } catch (const lmdb::error &e) {
- nhlog::crypto()->critical("failed to save inbound megolm session: {}",
- e.what());
- return;
- }
-
- nhlog::crypto()->info(
- "established inbound megolm session ({}, {})", room_id, sender);
- } else {
- nhlog::crypto()->warn(
- "inbound megolm session already exists ({}, {})", room_id, sender);
- }
-}
-
-void
-handle_olm_normal_message(const std::string &, const std::string &, const OlmCipherContent &)
-{
- nhlog::crypto()->warn("olm(1) not implemeted yet");
+ create_inbound_megolm_session(sender, sender_key, plaintext);
}
mtx::events::msg::Encrypted
@@ -165,4 +149,80 @@ encrypt_group_message(const std::string &room_id,
return data;
}
+boost::optional<json>
+try_olm_decryption(const std::string &sender_key, const OlmCipherContent &msg)
+{
+ auto session_ids = cache::client()->getOlmSessions(sender_key);
+
+ for (const auto &id : session_ids) {
+ auto session = cache::client()->getOlmSession(sender_key, id);
+
+ if (!session)
+ continue;
+
+ mtx::crypto::BinaryBuf text;
+
+ try {
+ text = olm::client()->decrypt_message(session->get(), msg.type, msg.body);
+ cache::client()->saveOlmSession(id, std::move(session.value()));
+
+ } catch (const olm_exception &e) {
+ nhlog::crypto()->info("failed to decrypt olm message ({}, {}) with {}: {}",
+ msg.type,
+ sender_key,
+ id,
+ e.what());
+ continue;
+ } catch (const lmdb::error &e) {
+ nhlog::crypto()->critical("failed to save session: {}", e.what());
+ return {};
+ }
+
+ try {
+ return json::parse(std::string((char *)text.data(), text.size()));
+ } catch (const json::exception &e) {
+ nhlog::crypto()->critical("failed to parse the decrypted session msg: {}",
+ e.what());
+ }
+ }
+
+ return {};
+}
+
+void
+create_inbound_megolm_session(const std::string &sender,
+ const std::string &sender_key,
+ const nlohmann::json &payload)
+{
+ std::string room_id, session_id, session_key;
+
+ try {
+ room_id = payload.at("content").at("room_id");
+ session_id = payload.at("content").at("session_id");
+ session_key = payload.at("content").at("session_key");
+ } catch (const nlohmann::json::exception &e) {
+ nhlog::crypto()->critical(
+ "failed to parse plaintext olm message: {} {}", e.what(), payload.dump(2));
+ return;
+ }
+
+ MegolmSessionIndex index;
+ index.room_id = room_id;
+ index.session_id = session_id;
+ index.sender_key = sender_key;
+
+ try {
+ auto megolm_session = olm::client()->init_inbound_group_session(session_key);
+ cache::client()->saveInboundMegolmSession(index, std::move(megolm_session));
+ } catch (const lmdb::error &e) {
+ nhlog::crypto()->critical("failed to save inbound megolm session: {}", e.what());
+ return;
+ } catch (const olm_exception &e) {
+ nhlog::crypto()->critical("failed to create inbound megolm session: {}", e.what());
+ return;
+ }
+
+ nhlog::crypto()->info("established inbound megolm session ({}, {})", room_id, sender);
+}
+
} // namespace olm
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