Thank you Snoopy for a patch that adds some filtering to client versions allowed at login and HG-login times. NOTE: additional (optional) configuration variables in [LoginService] and [GatekeeperService]. See .examples.

OpenSim/Services/HypergridService/GatekeeperService.cs

@@ -29,6 +29,7 @@ using System;
 using System.Collections.Generic;
 using System.Net;
 using System.Reflection;
+using System.Text.RegularExpressions;
 
 using OpenSim.Framework;
 using OpenSim.Services.Interfaces;
@@ -57,6 +58,9 @@ namespace OpenSim.Services.HypergridService
         private static IUserAgentService m_UserAgentService;
         private static ISimulationService m_SimulationService;
 
+        protected string m_AllowedClients = string.Empty;
+        protected string m_DeniedClients = string.Empty;
+
         private static UUID m_ScopeID;
         private static bool m_AllowTeleportsToAnyRegion;
         private static string m_ExternalName;
@@ -104,6 +108,9 @@ namespace OpenSim.Services.HypergridService
                 else if (simulationService != string.Empty)
                         m_SimulationService = ServerUtils.LoadPlugin<ISimulationService>(simulationService, args);
 
+                m_AllowedClients = serverConfig.GetString("AllowedClients", string.Empty);
+                m_DeniedClients = serverConfig.GetString("DeniedClients", string.Empty);
+
                 if (m_GridService == null || m_PresenceService == null || m_SimulationService == null)
                     throw new Exception("Unable to load a required plugin, Gatekeeper Service cannot function.");
 
@@ -181,8 +188,36 @@ namespace OpenSim.Services.HypergridService
             string authURL = string.Empty;
             if (aCircuit.ServiceURLs.ContainsKey("HomeURI"))
                 authURL = aCircuit.ServiceURLs["HomeURI"].ToString();
-            m_log.DebugFormat("[GATEKEEPER SERVICE]: Request to login foreign agent {0} {1} @ {2} ({3}) at destination {4}", 
-                aCircuit.firstname, aCircuit.lastname, authURL, aCircuit.AgentID, destination.RegionName);
+            m_log.InfoFormat("[GATEKEEPER SERVICE]: Login request for {0} {1} @ {2} ({3}) at {4} using viewer {5}, channel {6}, IP {7}, Mac {8}, Id0 {9}",
+                aCircuit.firstname, aCircuit.lastname, authURL, aCircuit.AgentID, destination.RegionName,
+                aCircuit.Viewer, aCircuit.Channel, aCircuit.IPAddress, aCircuit.Mac, aCircuit.Id0);
+            
+            //
+            // Check client
+            //
+            if (m_AllowedClients != string.Empty)
+            {
+                Regex arx = new Regex(m_AllowedClients);
+                Match am = arx.Match(aCircuit.Viewer);
+
+                if (!am.Success)
+                {
+                    m_log.InfoFormat("[GATEKEEPER SERVICE]: Login failed, reason: client {0} is not allowed", aCircuit.Viewer);
+                    return false;
+                }
+            }
+
+            if (m_DeniedClients != string.Empty)
+            {
+                Regex drx = new Regex(m_DeniedClients);
+                Match dm = drx.Match(aCircuit.Viewer);
+
+                if (dm.Success)
+                {
+                    m_log.InfoFormat("[GATEKEEPER SERVICE]: Login failed, reason: client {0} is denied", aCircuit.Viewer);
+                    return false;
+                }
+            }
 
             //
             // Authenticate the user

OpenSim/Services/LLLoginService/LLLoginService.cs

@@ -77,7 +77,11 @@ namespace OpenSim.Services.LLLoginService
         protected string m_MapTileURL;
         protected string m_SearchURL;
 
+        protected string m_AllowedClients;
+        protected string m_DeniedClients;
+
         IConfig m_LoginServerConfig;
+        IConfig m_ClientsConfig;
 
         public LLLoginService(IConfigSource config, ISimulationService simService, ILibraryService libraryService)
         {
@@ -105,7 +109,10 @@ namespace OpenSim.Services.LLLoginService
             m_GatekeeperURL = m_LoginServerConfig.GetString("GatekeeperURI", string.Empty);
             m_MapTileURL = m_LoginServerConfig.GetString("MapTileURL", string.Empty);
             m_SearchURL = m_LoginServerConfig.GetString("SearchURL", string.Empty);
-            
+
+            m_AllowedClients = m_LoginServerConfig.GetString("AllowedClients", string.Empty);
+            m_DeniedClients = m_LoginServerConfig.GetString("DeniedClients", string.Empty);
+
             // These are required; the others aren't
             if (accountService == string.Empty || authService == string.Empty)
                 throw new Exception("LoginService is missing service specifications");
@@ -215,10 +222,37 @@ namespace OpenSim.Services.LLLoginService
             bool success = false;
             UUID session = UUID.Random();
 
-            m_log.InfoFormat("[LLOGIN SERVICE]: Login request for {0} {1} from {2} with user agent {3} starting in {4}", 
-                firstName, lastName, clientIP.Address.ToString(), clientVersion, startLocation);
+            m_log.InfoFormat("[LLOGIN SERVICE]: Login request for {0} {1} at {2} using viewer {3}, channel {4}, IP {5}, Mac {6}, Id0 {7}",
+                firstName, lastName, startLocation, clientVersion, channel, clientIP.Address.ToString(), mac, id0);
             try
             {
+                //
+                // Check client
+                //
+                if (m_AllowedClients != string.Empty)
+                {
+                    Regex arx = new Regex(m_AllowedClients);
+                    Match am = arx.Match(clientVersion);
+
+                    if (!am.Success)
+                    {
+                        m_log.InfoFormat("[LLOGIN SERVICE]: Login failed, reason: client {0} is not allowed", clientVersion);
+                        return LLFailedLoginResponse.LoginBlockedProblem;
+                    }
+                }
+
+                if (m_DeniedClients != string.Empty)
+                {
+                    Regex drx = new Regex(m_DeniedClients);
+                    Match dm = drx.Match(clientVersion);
+
+                    if (dm.Success)
+                    {
+                        m_log.InfoFormat("[LLOGIN SERVICE]: Login failed, reason: client {0} is denied", clientVersion);
+                        return LLFailedLoginResponse.LoginBlockedProblem;
+                    }
+                }
+
                 //
                 // Get the account and check that it exists
                 //

bin/Robust.HG.ini.example

@@ -197,6 +197,23 @@ ServiceConnectors = "8003/OpenSim.Server.Handlers.dll:AssetServiceConnector,8003
     SRV_AssetServerURI = "http://127.0.0.1:8002"
     SRV_ProfileServerURI = "http://127.0.0.1:8002/user"
 
+	;; Regular expressions for controlling which client versions are accepted/denied.
+	;; An empty string means nothing is checked.
+	;;
+	;; Example 1: allow only these 3 types of clients (any version of them)
+	;; AllowedClients = "Imprudence|Hippo|Second Life"
+	;;
+	;; Example 2: allow all clients except these
+	;; DeniedClients = "Twisted|Crawler|Cryolife|FuckLife|StreetLife|GreenLife|AntiLife|KORE-Phaze|Synlyfe|Purple Second Life|SecondLi |Emerald"
+	;;
+	;; Note that these are regular expressions, so every character counts.
+	;; Also note that this is very weak security and should not be trusted as a reliable means
+	;; for keeping bad clients out; modified clients can fake their identifiers.
+	;;
+	;;
+    ;AllowedClients = ""
+    ;DeniedClients = ""
+
 [GridInfoService]
     ; These settings are used to return information on a get_grid_info call.
     ; Client launcher scripts and third-party clients make use of this to
@@ -256,6 +273,22 @@ ServiceConnectors = "8003/OpenSim.Server.Handlers.dll:AssetServiceConnector,8003
     ; If you run this gatekeeper server behind a proxy, set this to true
     ; HasProxy = false
 
+	;; Regular expressions for controlling which client versions are accepted/denied.
+	;; An empty string means nothing is checked.
+	;;
+	;; Example 1: allow only these 3 types of clients (any version of them)
+	;; AllowedClients = "Imprudence|Hippo|Second Life"
+	;;
+	;; Example 2: allow all clients except these
+	;; DeniedClients = "Twisted|Crawler|Cryolife|FuckLife|StreetLife|GreenLife|AntiLife|KORE-Phaze|Synlyfe|Purple Second Life|SecondLi |Emerald"
+	;;
+	;; Note that these are regular expressions, so every character counts.
+	;; Also note that this is very weak security and should not be trusted as a reliable means
+	;; for keeping bad clients out; modified clients can fake their identifiers.
+	;;
+	;;
+    ;AllowedClients = ""
+    ;DeniedClients = ""
 
 [UserAgentService]
     LocalServiceModule = "OpenSim.Services.HypergridService.dll:UserAgentService"

bin/Robust.ini.example

@@ -176,6 +176,23 @@ ServiceConnectors = "8003/OpenSim.Server.Handlers.dll:AssetServiceConnector,8003
     ; If you run this login server behind a proxy, set this to true
     ; HasProxy = false
 
+	;; Regular expressions for controlling which client versions are accepted/denied.
+	;; An empty string means nothing is checked.
+	;;
+	;; Example 1: allow only these 3 types of clients (any version of them)
+	;; AllowedClients = "Imprudence|Hippo|Second Life"
+	;;
+	;; Example 2: allow all clients except these
+	;; DeniedClients = "Twisted|Crawler|Cryolife|FuckLife|StreetLife|GreenLife|AntiLife|KORE-Phaze|Synlyfe|Purple Second Life|SecondLi |Emerald"
+	;;
+	;; Note that these are regular expressions, so every character counts.
+	;; Also note that this is very weak security and should not be trusted as a reliable means
+	;; for keeping bad clients out; modified clients can fake their identifiers.
+	;;
+	;;
+    ;AllowedClients = ""
+    ;DeniedClients = ""
+
 [GridInfoService]
     ; These settings are used to return information on a get_grid_info call.
     ; Client launcher scripts and third-party clients make use of this to

bin/config-include/StandaloneCommon.ini.example

@@ -83,6 +83,23 @@
     SRV_AssetServerURI = "http://127.0.0.1:9000"
     SRV_ProfileServerURI = "http://127.0.0.1:9000"
 
+	;; Regular expressions for controlling which client versions are accepted/denied.
+	;; An empty string means nothing is checked.
+	;;
+	;; Example 1: allow only these 3 types of clients (any version of them)
+	;; AllowedClients = "Imprudence|Hippo|Second Life"
+	;;
+	;; Example 2: allow all clients except these
+	;; DeniedClients = "Twisted|Crawler|Cryolife|FuckLife|StreetLife|GreenLife|AntiLife|KORE-Phaze|Synlyfe|Purple Second Life|SecondLi |Emerald"
+	;;
+	;; Note that these are regular expressions, so every character counts.
+	;; Also note that this is very weak security and should not be trusted as a reliable means
+	;; for keeping bad clients out; modified clients can fake their identifiers.
+	;;
+	;;
+    ;AllowedClients = ""
+    ;DeniedClients = ""
+
 [GatekeeperService]
     ExternalName = "http://127.0.0.1:9000"
 
@@ -90,6 +107,23 @@
     ; If false, HG TPs happen only to the  Default regions specified in [GridService] section
     AllowTeleportsToAnyRegion = true
 
+	;; Regular expressions for controlling which client versions are accepted/denied.
+	;; An empty string means nothing is checked.
+	;;
+	;; Example 1: allow only these 3 types of clients (any version of them)
+	;; AllowedClients = "Imprudence|Hippo|Second Life"
+	;;
+	;; Example 2: allow all clients except these
+	;; DeniedClients = "Twisted|Crawler|Cryolife|FuckLife|StreetLife|GreenLife|AntiLife|KORE-Phaze|Synlyfe|Purple Second Life|SecondLi |Emerald"
+	;;
+	;; Note that these are regular expressions, so every character counts.
+	;; Also note that this is very weak security and should not be trusted as a reliable means
+	;; for keeping bad clients out; modified clients can fake their identifiers.
+	;;
+	;;
+    ;AllowedClients = ""
+    ;DeniedClients = ""
+
 [GridInfoService]
     ; These settings are used to return information on a get_grid_info call.
     ; Client launcher scripts and third-party clients make use of this to