From 82e35edff52d88dcd64a9bfc9d2c4c93f1341b78 Mon Sep 17 00:00:00 2001
From: est31 <MTest31@outlook.com>
Date: Sun, 12 Apr 2015 04:49:13 +0200
Subject: Make early protocol auth mechanism generic, and add SRP

Adds everything needed for SRP (and everything works too),
but still deactivated, as protocol v25 init packets aren't final yet.
Can be activated by changing the LATEST_PROTOCOL_VERSION header to 25
inside networkprotocol.h.
---
 src/server.cpp | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)

(limited to 'src/server.cpp')

diff --git a/src/server.cpp b/src/server.cpp
index 7289dc905..f032da406 100644
--- a/src/server.cpp
+++ b/src/server.cpp
@@ -2537,6 +2537,13 @@ void Server::RespawnPlayer(u16 peer_id)
 		playersao->setPos(pos);
 	}
 }
+void Server::DenySudoAccess(u16 peer_id)
+{
+	DSTACK(__FUNCTION_NAME);
+
+	NetworkPacket pkt(TOCLIENT_DENY_SUDO_MODE, 0, peer_id);
+	Send(&pkt);
+}
 
 void Server::DenyAccess(u16 peer_id, AccessDeniedCode reason, const std::string &custom_reason)
 {
@@ -2558,6 +2565,37 @@ void Server::DenyAccess_Legacy(u16 peer_id, const std::wstring &reason)
 	m_con.DisconnectPeer(peer_id);
 }
 
+void Server::acceptAuth(u16 peer_id, bool forSudoMode)
+{
+	DSTACK(__FUNCTION_NAME);
+
+	if (!forSudoMode) {
+		RemoteClient* client = getClient(peer_id, CS_Invalid);
+
+		NetworkPacket resp_pkt(TOCLIENT_AUTH_ACCEPT, 1 + 6 + 8 + 4, peer_id);
+
+		// Right now, the auth mechs don't change between login and sudo mode.
+		u32 sudo_auth_mechs = client->allowed_auth_mechs;
+		client->allowed_sudo_mechs = sudo_auth_mechs;
+
+		resp_pkt << v3f(0,0,0) << (u64) m_env->getServerMap().getSeed()
+				<< g_settings->getFloat("dedicated_server_step")
+				<< sudo_auth_mechs;
+
+		Send(&resp_pkt);
+		m_clients.event(peer_id, CSE_AuthAccept);
+	} else {
+		NetworkPacket resp_pkt(TOCLIENT_ACCEPT_SUDO_MODE, 1 + 6 + 8 + 4, peer_id);
+
+		// We only support SRP right now
+		u32 sudo_auth_mechs = AUTH_MECHANISM_FIRST_SRP;
+
+		resp_pkt << sudo_auth_mechs;
+		Send(&resp_pkt);
+		m_clients.event(peer_id, CSE_SudoSuccess);
+	}
+}
+
 void Server::DeleteClient(u16 peer_id, ClientDeletionReason reason)
 {
 	DSTACK(__FUNCTION_NAME);
-- 
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