From 58478a241a964e48fa96e19db9cca8c32d1a60ae Mon Sep 17 00:00:00 2001
From: Sebastian Joseph <contact@sebastian-joseph.de>
Date: Mon, 11 Apr 2016 23:18:12 +0200
Subject: [PATCH] Implemented an option to restict access to only known
 players.

---
 src/defaultsettings.cpp | 1 +
 src/server.cpp          | 8 ++++++++
 voxelands.conf.example  | 2 ++
 3 files changed, 11 insertions(+)

diff --git a/src/defaultsettings.cpp b/src/defaultsettings.cpp
index af662c9..d0039d4 100644
--- a/src/defaultsettings.cpp
+++ b/src/defaultsettings.cpp
@@ -124,6 +124,7 @@ void set_default_settings(Settings *settings)
 	settings->setDefault("max_users", "20");
 	settings->setDefault("strict_protocol_version_checking", "false");
 	settings->setDefault("disallow_empty_passwords","false");
+	settings->setDefault("disallow_unknown_users","false");
 	settings->setDefault("fixed_map_seed", "");
 	settings->setDefault("default_password", "");
 	settings->setDefault("default_privs", "build, shout");
diff --git a/src/server.cpp b/src/server.cpp
index bb370b3..69aeb36 100644
--- a/src/server.cpp
+++ b/src/server.cpp
@@ -1856,6 +1856,14 @@ void Server::ProcessData(u8 *data, u32 datasize, u16 peer_id)
 			SendAccessDenied(m_con, peer_id, L"Empty passwords are not allowed on this server.");
 			return;
 		}
+		
+		if (g_settings->getBool("disallow_unknown_users") &&
+ 			!m_authmanager.exists(playername)) {
+			infostream<<"Server: unknown player "<<playername
+				<<" was blocked"<<std::endl;
+			SendAccessDenied(m_con, peer_id, L"No unkown players allowed.");
+			return;
+		}
 
 		std::string checkpwd;
 		if (m_authmanager.exists(playername)) {
diff --git a/voxelands.conf.example b/voxelands.conf.example
index 58cc57a..cb3639d 100644
--- a/voxelands.conf.example
+++ b/voxelands.conf.example
@@ -212,6 +212,8 @@
 #default_password =
 # Don't let players join with an empty password
 #disallow_empty_passwords = false
+# Don't let players join without a entry on the auth.txt (should be used with disallow_empty_passwords = true)
+#disallow_unknown_users = false
 # Available privileges: build, teleport, settime, privs, shout
 #default_privs = build, shout
 # enable a static spawnpoint (default unset)