From 0c8697438b8a20cdcd1bbf9d9ead9498b1303f75 Mon Sep 17 00:00:00 2001
From: zaCade <zaCade@hotmail.com>
Date: Sun, 15 Jul 2018 23:38:20 +0200
Subject: [PATCH] NoSteamManager: Potentially block steamid spoofs.

Block no-steamers from joining whenever the 'owner' of the steamid is
connected, or kick them whenever the 'owner' is connecting.
---
 NoSteamManager/scripting/NoSteamManager.sp | 56 ++++++++++++++++++++--
 1 file changed, 52 insertions(+), 4 deletions(-)

diff --git a/NoSteamManager/scripting/NoSteamManager.sp b/NoSteamManager/scripting/NoSteamManager.sp
index 6986c629..e571ea69 100644
--- a/NoSteamManager/scripting/NoSteamManager.sp
+++ b/NoSteamManager/scripting/NoSteamManager.sp
@@ -9,6 +9,7 @@
 /* CONVARS */
 ConVar g_hCvar_BlockAdmin;
 ConVar g_hCvar_BlockVoice;
+ConVar g_hCvar_BlockSpoof;
 
 //----------------------------------------------------------------------------------------------------
 // Purpose:
@@ -28,6 +29,7 @@ public void OnPluginStart()
 {
 	g_hCvar_BlockAdmin = CreateConVar("sm_nosteam_block_admin", "1", "Should people marked as nosteam be blocked from admin?", FCVAR_NONE, true, 0.0, true, 1.0);
 	g_hCvar_BlockVoice = CreateConVar("sm_nosteam_block_voice", "1", "Should people marked as nosteam be blocked from voice?", FCVAR_NONE, true, 0.0, true, 1.0);
+	g_hCvar_BlockSpoof = CreateConVar("sm_nosteam_block_spoof", "1", "Block nosteam people being able to spoof steamids.",     FCVAR_NONE, true, 0.0, true, 1.0);
 
 	AddMultiTargetFilter("@steam", Filter_Steam, "Steam Players", false);
 	AddMultiTargetFilter("@nosteam", Filter_NoSteam, "No-Steam Players", false);
@@ -125,10 +127,10 @@ public bool Filter_NoSteam(const char[] sPattern, Handle hClients)
 //----------------------------------------------------------------------------------------------------
 public Action OnClientPreAdminCheck(int client)
 {
-	if (!g_hCvar_BlockAdmin.BoolValue)
+	if(!g_hCvar_BlockAdmin.BoolValue)
 		return Plugin_Continue;
 
-	if (IsFakeClient(client) || IsClientSourceTV(client))
+	if(IsFakeClient(client) || IsClientSourceTV(client))
 		return Plugin_Continue;
 
 	char sSteamID[32];
@@ -150,10 +152,10 @@ public Action OnClientPreAdminCheck(int client)
 //----------------------------------------------------------------------------------------------------
 public void OnClientPostAdminCheck(int client)
 {
-	if (!g_hCvar_BlockVoice.BoolValue)
+	if(!g_hCvar_BlockVoice.BoolValue)
 		return;
 
-	if (IsFakeClient(client) || IsClientSourceTV(client))
+	if(IsFakeClient(client) || IsClientSourceTV(client))
 		return;
 
 	char sSteamID[32];
@@ -167,3 +169,49 @@ public void OnClientPostAdminCheck(int client)
 		return;
 	}
 }
+
+//----------------------------------------------------------------------------------------------------
+// Purpose:
+//----------------------------------------------------------------------------------------------------
+public void OnClientPutInServer(int client)
+{
+	if(!g_hCvar_BlockSpoof.BoolValue)
+		return;
+
+	if(IsFakeClient(client) || IsClientSourceTV(client))
+		return;
+
+	char sSteamID[32];
+	GetClientAuthId(client, AuthId_Steam2, sSteamID, sizeof(sSteamID));
+
+	for(int player = 1; player <= MaxClients; player++)
+	{
+		if(IsFakeClient(player) || IsClientSourceTV(player))
+			continue;
+
+		if(client == player || !IsClientConnected(player))
+			continue;
+
+		char sPlayerSteamID[32];
+		GetClientAuthId(player, AuthId_Steam2, sPlayerSteamID, sizeof(sPlayerSteamID));
+
+		if(StrEqual(sSteamID, sPlayerSteamID, false))
+		{
+			if(!SteamClientAuthenticated(sSteamID))
+			{
+				LogMessage("%L was not authenticated with steam, steamid already connected. Kicking connector.", client);
+				KickClient(client, "Please come back later.");
+				return;
+			}
+
+			if(!SteamClientAuthenticated(sPlayerSteamID))
+			{
+				LogMessage("%L was not authenticated with steam, steamid already connected. Kicking connected.", player);
+				KickClient(player, "Please come back later.");
+				return;
+			}
+
+			break;
+		}
+	}
+}