From 28220406f68f38d56648c3932c555b6d6d2b5788 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Roman=20Smr=C5=BE?= <roman.smrz@seznam.cz>
Date: Wed, 10 Nov 2021 21:40:30 +0100
Subject: Network: hold sensitive messages until channel is established

---
 src/network.cpp | 51 +++++++++++++++++++++++++++++++++++++--------------
 src/network.h   |  4 +++-
 2 files changed, 40 insertions(+), 15 deletions(-)

diff --git a/src/network.cpp b/src/network.cpp
index 8ee61b3..2db450c 100644
--- a/src/network.cpp
+++ b/src/network.cpp
@@ -14,6 +14,7 @@
 #include <unistd.h>
 
 using std::holds_alternative;
+using std::move;
 using std::runtime_error;
 using std::scoped_lock;
 using std::to_string;
@@ -148,15 +149,14 @@ bool Peer::send(UUID uuid, const Object & obj) const
 
 bool Peer::send(UUID uuid, const Ref & ref, const Object & obj) const
 {
-	if (hasChannel())
-		if (auto speer = p->speer.lock()) {
-			TransportHeader header({
-				{ TransportHeader::Type::ServiceType, uuid },
-					{ TransportHeader::Type::ServiceRef, ref },
-			});
-			speer->send(header, { obj });
-			return true;
-		}
+	if (auto speer = p->speer.lock()) {
+		TransportHeader header({
+			{ TransportHeader::Type::ServiceType, uuid },
+				{ TransportHeader::Type::ServiceRef, ref },
+		});
+		speer->send(header, { obj }, true);
+		return true;
+	}
 
 	return false;
 }
@@ -326,7 +326,9 @@ void Server::Priv::doListen()
 				peer.updateService(reply);
 
 				if (!reply.header().empty())
-					peer.send(TransportHeader(reply.header()), reply.body());
+					peer.send(TransportHeader(reply.header()), reply.body(), false);
+
+				peer.trySendOutQueue();
 			}
 		} else {
 			std::cerr << "invalid packet\n";
@@ -541,12 +543,12 @@ void Server::Priv::handleLocalHeadChange(const Head<LocalState> & head)
 			});
 
 			for (const auto & peer : peers)
-				peer->send(header, { **self.ref() });
+				peer->send(header, { **self.ref() }, false);
 		}
 	}
 }
 
-void Server::Peer::send(const TransportHeader & header, const vector<Object> & objs) const
+void Server::Peer::send(const TransportHeader & header, const vector<Object> & objs, bool secure)
 {
 	vector<uint8_t> data, part, out;
 
@@ -559,11 +561,14 @@ void Server::Peer::send(const TransportHeader & header, const vector<Object> & o
 
 	if (holds_alternative<Stored<Channel>>(channel))
 		out = std::get<Stored<Channel>>(channel)->encrypt(data);
+	else if (secure)
+		secureOutQueue.emplace_back(move(data));
 	else
 		out = std::move(data);
 
-	sendto(server.sock, out.data(), out.size(), 0,
-			(sockaddr *) &addr, sizeof(addr));
+	if (!out.empty())
+		sendto(server.sock, out.data(), out.size(), 0,
+				(sockaddr *) &addr, sizeof(addr));
 }
 
 void Server::Peer::updateIdentity(ReplyBuilder & reply)
@@ -647,6 +652,24 @@ void Server::Peer::updateService(ReplyBuilder & reply)
 	serviceQueue = std::move(next);
 }
 
+void Server::Peer::trySendOutQueue()
+{
+	if (secureOutQueue.empty())
+		return;
+
+	if (!holds_alternative<Stored<Channel>>(channel))
+		return;
+
+	for (const auto & data : secureOutQueue) {
+		auto out = std::get<Stored<Channel>>(channel)->encrypt(data);
+
+		sendto(server.sock, out.data(), out.size(), 0,
+				(sockaddr *) &addr, sizeof(addr));
+	}
+
+	secureOutQueue.clear();
+}
+
 
 void ReplyBuilder::header(TransportHeader::Item && item)
 {
diff --git a/src/network.h b/src/network.h
index fe7d7b4..c4f3d6f 100644
--- a/src/network.h
+++ b/src/network.h
@@ -56,13 +56,15 @@ struct Server::Peer
 	PartialStorage partStorage;
 
 	vector<tuple<UUID, shared_ptr<WaitingRef>>> serviceQueue {};
+	vector<vector<uint8_t>> secureOutQueue {};
 
 	shared_ptr<erebos::Peer::Priv> lpeer = nullptr;
 
-	void send(const struct TransportHeader &, const vector<Object> &) const;
+	void send(const struct TransportHeader &, const vector<Object> &, bool secure);
 	void updateIdentity(ReplyBuilder &);
 	void updateChannel(ReplyBuilder &);
 	void updateService(ReplyBuilder &);
+	void trySendOutQueue();
 };
 
 struct Peer::Priv : enable_shared_from_this<Peer::Priv>
-- 
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