mirror of
https://github.com/Nheko-Reborn/nheko.git
synced 2024-10-31 10:00:46 +03:00
140 lines
4.8 KiB
C++
140 lines
4.8 KiB
C++
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#include "Olm.hpp"
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#include "Cache.h"
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#include "Logging.hpp"
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using namespace mtx::crypto;
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namespace {
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auto client_ = std::make_unique<mtx::crypto::OlmClient>();
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}
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namespace olm {
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mtx::crypto::OlmClient *
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client()
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{
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return client_.get();
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}
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void
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handle_to_device_messages(const std::vector<nlohmann::json> &msgs)
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{
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if (msgs.empty())
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return;
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log::crypto()->info("received {} to_device messages", msgs.size());
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for (const auto &msg : msgs) {
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try {
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OlmMessage olm_msg = msg;
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handle_olm_message(std::move(olm_msg));
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} catch (const nlohmann::json::exception &e) {
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log::crypto()->warn(
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"parsing error for olm message: {} {}", e.what(), msg.dump(2));
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} catch (const std::invalid_argument &e) {
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log::crypto()->warn(
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"validation error for olm message: {} {}", e.what(), msg.dump(2));
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}
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}
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}
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void
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handle_olm_message(const OlmMessage &msg)
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{
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log::crypto()->info("sender : {}", msg.sender);
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log::crypto()->info("sender_key: {}", msg.sender_key);
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const auto my_key = olm::client()->identity_keys().curve25519;
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for (const auto &cipher : msg.ciphertext) {
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// We skip messages not meant for the current device.
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if (cipher.first != my_key)
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continue;
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const auto type = cipher.second.type;
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log::crypto()->info("type: {}", type == 0 ? "OLM_PRE_KEY" : "OLM_MESSAGE");
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if (type == OLM_MESSAGE_TYPE_PRE_KEY)
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handle_pre_key_olm_message(msg.sender, msg.sender_key, cipher.second);
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else
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handle_olm_normal_message(msg.sender, msg.sender_key, cipher.second);
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}
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}
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void
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handle_pre_key_olm_message(const std::string &sender,
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const std::string &sender_key,
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const OlmCipherContent &content)
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{
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log::crypto()->info("opening olm session with {}", sender);
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OlmSessionPtr inbound_session = nullptr;
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try {
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inbound_session = olm::client()->create_inbound_session(content.body);
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} catch (const olm_exception &e) {
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log::crypto()->critical(
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"failed to create inbound session with {}: {}", sender, e.what());
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return;
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}
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if (!matches_inbound_session_from(inbound_session.get(), sender_key, content.body)) {
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log::crypto()->warn("inbound olm session doesn't match sender's key ({})", sender);
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return;
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}
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mtx::crypto::BinaryBuf output;
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try {
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output = olm::client()->decrypt_message(
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inbound_session.get(), OLM_MESSAGE_TYPE_PRE_KEY, content.body);
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} catch (const olm_exception &e) {
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log::crypto()->critical(
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"failed to decrypt olm message {}: {}", content.body, e.what());
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return;
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}
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auto plaintext = json::parse(std::string((char *)output.data(), output.size()));
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log::crypto()->info("decrypted message: \n {}", plaintext.dump(2));
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std::string room_id, session_id, session_key;
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try {
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room_id = plaintext.at("content").at("room_id");
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session_id = plaintext.at("content").at("session_id");
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session_key = plaintext.at("content").at("session_key");
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} catch (const nlohmann::json::exception &e) {
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log::crypto()->critical(
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"failed to parse plaintext olm message: {} {}", e.what(), plaintext.dump(2));
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return;
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}
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MegolmSessionIndex index;
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index.room_id = room_id;
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index.session_id = session_id;
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index.sender_key = sender_key;
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if (!cache::client()->inboundMegolmSessionExists(index)) {
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auto megolm_session = olm::client()->init_inbound_group_session(session_key);
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try {
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cache::client()->saveInboundMegolmSession(index, std::move(megolm_session));
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} catch (const lmdb::error &e) {
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log::crypto()->critical("failed to save inbound megolm session: {}",
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e.what());
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return;
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}
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log::crypto()->info("established inbound megolm session ({}, {})", room_id, sender);
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} else {
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log::crypto()->warn(
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"inbound megolm session already exists ({}, {})", room_id, sender);
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}
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}
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void
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handle_olm_normal_message(const std::string &, const std::string &, const OlmCipherContent &)
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{
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log::crypto()->warn("olm(1) not implemeted yet");
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}
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} // namespace olm
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