aboutsummaryrefslogtreecommitdiffstatshomepage
path: root/OpenSim/Services/HypergridService/GatekeeperService.cs
blob: 9643a8bd721589e7dd07808810d0229ebab979b6 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
/*
 * Copyright (c) Contributors, http://opensimulator.org/
 * See CONTRIBUTORS.TXT for a full list of copyright holders.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the OpenSimulator Project nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

using System;
using System.Collections.Generic;
using System.Net;
using System.Reflection;
using System.Text.RegularExpressions;

using OpenSim.Framework;
using OpenSim.Services.Interfaces;
using GridRegion = OpenSim.Services.Interfaces.GridRegion;
using OpenSim.Server.Base;
using OpenSim.Services.Connectors.Hypergrid;

using OpenMetaverse;

using Nini.Config;
using log4net;

namespace OpenSim.Services.HypergridService
{
    public class GatekeeperService : IGatekeeperService
    {
        private static readonly ILog m_log =
                LogManager.GetLogger(
                MethodBase.GetCurrentMethod().DeclaringType);

        private static bool m_Initialized = false;

        private static IGridService m_GridService;
        private static IPresenceService m_PresenceService;
        private static IUserAccountService m_UserAccountService;
        private static IUserAgentService m_UserAgentService;
        private static ISimulationService m_SimulationService;
        private static IGridUserService m_GridUserService;
        private static IBansService m_BansService;

        private static string m_AllowedClients = string.Empty;
        private static string m_DeniedClients = string.Empty;
        private static bool m_ForeignAgentsAllowed = true;
        private static List<string> m_ForeignsAllowedExceptions = new List<string>();
        private static List<string> m_ForeignsDisallowedExceptions = new List<string>();

        private static UUID m_ScopeID;
        private static bool m_AllowTeleportsToAnyRegion;
        private static string m_ExternalName;
        private static Uri m_Uri;
        private static GridRegion m_DefaultGatewayRegion;

        public GatekeeperService(IConfigSource config, ISimulationService simService)
        {
            if (!m_Initialized)
            {
                m_Initialized = true;

                IConfig serverConfig = config.Configs["GatekeeperService"];
                if (serverConfig == null)
                    throw new Exception(String.Format("No section GatekeeperService in config file"));

                string accountService = serverConfig.GetString("UserAccountService", String.Empty);
                string homeUsersService = serverConfig.GetString("UserAgentService", string.Empty);
                string gridService = serverConfig.GetString("GridService", String.Empty);
                string presenceService = serverConfig.GetString("PresenceService", String.Empty);
                string simulationService = serverConfig.GetString("SimulationService", String.Empty);
                string gridUserService = serverConfig.GetString("GridUserService", String.Empty);
                string bansService = serverConfig.GetString("BansService", String.Empty);

                // These are mandatory, the others aren't
                if (gridService == string.Empty || presenceService == string.Empty)
                    throw new Exception("Incomplete specifications, Gatekeeper Service cannot function.");
                
                string scope = serverConfig.GetString("ScopeID", UUID.Zero.ToString());
                UUID.TryParse(scope, out m_ScopeID);
                //m_WelcomeMessage = serverConfig.GetString("WelcomeMessage", "Welcome to OpenSim!");
                m_AllowTeleportsToAnyRegion = serverConfig.GetBoolean("AllowTeleportsToAnyRegion", true);
                m_ExternalName = Util.GetConfigVarFromSections<string>(config, "GatekeeperURI",
                    new string[] { "Startup", "Hypergrid", "GatekeeperService" }, String.Empty);
                m_ExternalName = serverConfig.GetString("ExternalName", m_ExternalName);
                if (m_ExternalName != string.Empty && !m_ExternalName.EndsWith("/"))
                    m_ExternalName = m_ExternalName + "/";

                try
                {
                    m_Uri = new Uri(m_ExternalName);
                }
                catch
                {
                    m_log.WarnFormat("[GATEKEEPER SERVICE]: Malformed gatekeeper address {0}", m_ExternalName);
                }

                Object[] args = new Object[] { config };
                m_GridService = ServerUtils.LoadPlugin<IGridService>(gridService, args);
                m_PresenceService = ServerUtils.LoadPlugin<IPresenceService>(presenceService, args);

                if (accountService != string.Empty)
                    m_UserAccountService = ServerUtils.LoadPlugin<IUserAccountService>(accountService, args);
                if (homeUsersService != string.Empty)
                    m_UserAgentService = ServerUtils.LoadPlugin<IUserAgentService>(homeUsersService, args);
                if (gridUserService != string.Empty)
                    m_GridUserService = ServerUtils.LoadPlugin<IGridUserService>(gridUserService, args);
                if (bansService != string.Empty)
                    m_BansService = ServerUtils.LoadPlugin<IBansService>(bansService, args);

                if (simService != null)
                    m_SimulationService = simService;
                else if (simulationService != string.Empty)
                        m_SimulationService = ServerUtils.LoadPlugin<ISimulationService>(simulationService, args);

                string[] possibleAccessControlConfigSections = new string[] { "AccessControl", "GatekeeperService" };
                m_AllowedClients = Util.GetConfigVarFromSections<string>(
                        config, "AllowedClients", possibleAccessControlConfigSections, string.Empty);
                m_DeniedClients = Util.GetConfigVarFromSections<string>(
                        config, "DeniedClients", possibleAccessControlConfigSections, string.Empty); 
                m_ForeignAgentsAllowed = serverConfig.GetBoolean("ForeignAgentsAllowed", true);

                LoadDomainExceptionsFromConfig(serverConfig, "AllowExcept", m_ForeignsAllowedExceptions);
                LoadDomainExceptionsFromConfig(serverConfig, "DisallowExcept", m_ForeignsDisallowedExceptions);

                if (m_GridService == null || m_PresenceService == null || m_SimulationService == null)
                    throw new Exception("Unable to load a required plugin, Gatekeeper Service cannot function.");

                m_log.Debug("[GATEKEEPER SERVICE]: Starting...");
            }
        }

        public GatekeeperService(IConfigSource config)
            : this(config, null)
        {
        }

        protected void LoadDomainExceptionsFromConfig(IConfig config, string variable, List<string> exceptions)
        {
            string value = config.GetString(variable, string.Empty);
            string[] parts = value.Split(new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries);

            foreach (string s in parts)
                exceptions.Add(s.Trim());
        }

        public bool LinkRegion(string regionName, out UUID regionID, out ulong regionHandle, out string externalName, out string imageURL, out string reason)
        {
            regionID = UUID.Zero;
            regionHandle = 0;
            externalName = m_ExternalName + ((regionName != string.Empty) ? " " + regionName : "");
            imageURL = string.Empty;
            reason = string.Empty;
            GridRegion region = null;

            m_log.DebugFormat("[GATEKEEPER SERVICE]: Request to link to {0}", (regionName == string.Empty)? "default region" : regionName);
            if (!m_AllowTeleportsToAnyRegion || regionName == string.Empty)
            {
                List<GridRegion> defs = m_GridService.GetDefaultHypergridRegions(m_ScopeID);
                if (defs != null && defs.Count > 0)
                {
                    region = defs[0];
                    m_DefaultGatewayRegion = region;
                }
                else
                {
                    reason = "Grid setup problem. Try specifying a particular region here.";
                    m_log.DebugFormat("[GATEKEEPER SERVICE]: Unable to send information. Please specify a default region for this grid!");
                    return false;
                }
            }
            else
            {
                region = m_GridService.GetRegionByName(m_ScopeID, regionName);
                if (region == null)
                {
                    reason = "Region not found";
                    return false;
                }
            }

            regionID = region.RegionID;
            regionHandle = region.RegionHandle;

            string regionimage = "regionImage" + regionID.ToString();
            regionimage = regionimage.Replace("-", "");
            imageURL = region.ServerURI + "index.php?method=" + regionimage;

            return true;
        }

        public GridRegion GetHyperlinkRegion(UUID regionID, UUID agentID, string agentHomeURI, out string message)
        {
            message = null;

            if (!m_AllowTeleportsToAnyRegion)
            {
                // Don't even check the given regionID
                m_log.DebugFormat(
                    "[GATEKEEPER SERVICE]: Returning gateway region {0} {1} @ {2} to user {3}{4} as teleporting to arbitrary regions is not allowed.", 
                    m_DefaultGatewayRegion.RegionName, 
                    m_DefaultGatewayRegion.RegionID,
                    m_DefaultGatewayRegion.ServerURI,
                    agentID, 
                    agentHomeURI == null ? "" : " @ " + agentHomeURI);

                message = "Teleporting to the default region.";
                return m_DefaultGatewayRegion;
            }

            GridRegion region = m_GridService.GetRegionByUUID(m_ScopeID, regionID);

            if (region == null)
            {
                m_log.DebugFormat(
                    "[GATEKEEPER SERVICE]: Could not find region with ID {0} as requested by user {1}{2}.  Returning null.",
                    regionID, agentID, (agentHomeURI == null) ? "" : " @ " + agentHomeURI);

                message = "The teleport destination could not be found.";
                return null;
            }

            m_log.DebugFormat(
                "[GATEKEEPER SERVICE]: Returning region {0} {1} @ {2} to user {3}{4}.",
                region.RegionName, 
                region.RegionID,
                region.ServerURI,
                agentID, 
                agentHomeURI == null ? "" : " @ " + agentHomeURI);

            return region;
        }

        #region Login Agent
        public bool LoginAgent(GridRegion source, AgentCircuitData aCircuit, GridRegion destination, out string reason)
        {
            reason = string.Empty;

            string authURL = string.Empty;
            if (aCircuit.ServiceURLs.ContainsKey("HomeURI"))
                authURL = aCircuit.ServiceURLs["HomeURI"].ToString();

            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}, Teleport Flags: {10}. From region {11}",
                aCircuit.firstname, aCircuit.lastname, authURL, aCircuit.AgentID, destination.RegionID,
                aCircuit.Viewer, aCircuit.Channel, aCircuit.IPAddress, aCircuit.Mac, aCircuit.Id0, (TeleportFlags)aCircuit.teleportFlags,
                (source == null) ? "Unknown" : string.Format("{0} ({1}){2}", source.RegionName, source.RegionID, (source.RawServerURI == null) ? "" : " @ " + source.ServerURI));

            string curViewer = Util.GetViewerName(aCircuit);

            //
            // Check client
            //
            if (m_AllowedClients != string.Empty)
            {
                Regex arx = new Regex(m_AllowedClients);
                Match am = arx.Match(curViewer);

                if (!am.Success)
                {
                    m_log.InfoFormat("[GATEKEEPER SERVICE]: Login failed, reason: client {0} is not allowed", curViewer);
                    return false;
                }
            }

            if (m_DeniedClients != string.Empty)
            {
                Regex drx = new Regex(m_DeniedClients);
                Match dm = drx.Match(curViewer);

                if (dm.Success)
                {
                    m_log.InfoFormat("[GATEKEEPER SERVICE]: Login failed, reason: client {0} is denied", curViewer);
                    return false;
                }
            }

            //
            // Authenticate the user
            //
            if (!Authenticate(aCircuit))
            {
                reason = "Unable to verify identity";
                m_log.InfoFormat("[GATEKEEPER SERVICE]: Unable to verify identity of agent {0} {1}. Refusing service.", aCircuit.firstname, aCircuit.lastname);
                return false;
            }
            m_log.DebugFormat("[GATEKEEPER SERVICE]: Identity verified for {0} {1} @ {2}", aCircuit.firstname, aCircuit.lastname, authURL);
            
            //
            // Check for impersonations
            //
            UserAccount account = null;
            if (m_UserAccountService != null)
            {
                // Check to see if we have a local user with that UUID
                account = m_UserAccountService.GetUserAccount(m_ScopeID, aCircuit.AgentID);
                if (account != null)
                {
                    // Make sure this is the user coming home, and not a foreign user with same UUID as a local user
                    if (m_UserAgentService != null)
                    {
                        if (!m_UserAgentService.IsAgentComingHome(aCircuit.SessionID, m_ExternalName))
                        {
                            // Can't do, sorry
                            reason = "Unauthorized";
                            m_log.InfoFormat("[GATEKEEPER SERVICE]: Foreign agent {0} {1} has same ID as local user. Refusing service.",
                                aCircuit.firstname, aCircuit.lastname);
                            return false;

                        }
                    }
                }
            }

            //
            // Foreign agents allowed? Exceptions?
            //
            if (account == null)
            {
                bool allowed = m_ForeignAgentsAllowed;

                if (m_ForeignAgentsAllowed && IsException(aCircuit, m_ForeignsAllowedExceptions))
                    allowed = false;

                if (!m_ForeignAgentsAllowed && IsException(aCircuit, m_ForeignsDisallowedExceptions))
                    allowed = true;

                if (!allowed)
                {
                    reason = "Destination does not allow visitors from your world";
                    m_log.InfoFormat("[GATEKEEPER SERVICE]: Foreign agents are not permitted {0} {1} @ {2}. Refusing service.",
                        aCircuit.firstname, aCircuit.lastname, aCircuit.ServiceURLs["HomeURI"]);
                    return false;
                }
            }

            //
            // Is the user banned?
            // This uses a Ban service that's more powerful than the configs
            //
            string uui = (account != null ? aCircuit.AgentID.ToString() : Util.ProduceUserUniversalIdentifier(aCircuit));
            if (m_BansService != null && m_BansService.IsBanned(uui, aCircuit.IPAddress, aCircuit.Id0, authURL))
            {
                reason = "You are banned from this world";
                m_log.InfoFormat("[GATEKEEPER SERVICE]: Login failed, reason: user {0} is banned", uui);
                return false;
            }

            m_log.DebugFormat("[GATEKEEPER SERVICE]: User {0} is ok", aCircuit.Name);

            bool isFirstLogin = false;
            //
            // Login the presence, if it's not there yet (by the login service)
            //
            PresenceInfo presence = m_PresenceService.GetAgent(aCircuit.SessionID);
            if (presence != null) // it has been placed there by the login service
                isFirstLogin = true;

            else
            {
                if (!m_PresenceService.LoginAgent(aCircuit.AgentID.ToString(), aCircuit.SessionID, aCircuit.SecureSessionID))
                {
                    reason = "Unable to login presence";
                    m_log.InfoFormat("[GATEKEEPER SERVICE]: Presence login failed for foreign agent {0} {1}. Refusing service.",
                        aCircuit.firstname, aCircuit.lastname);
                    return false;
                }

                m_log.DebugFormat("[GATEKEEPER SERVICE]: Login presence {0} is ok", aCircuit.Name);

                // Also login foreigners with GridUser service
                if (m_GridUserService != null && account == null)
                {
                    string userId = aCircuit.AgentID.ToString();
                    string first = aCircuit.firstname, last = aCircuit.lastname;
                    if (last.StartsWith("@"))
                    {
                        string[] parts = aCircuit.firstname.Split('.');
                        if (parts.Length >= 2)
                        {
                            first = parts[0];
                            last = parts[1];
                        }
                    }

                    userId += ";" + aCircuit.ServiceURLs["HomeURI"] + ";" + first + " " + last;
                    m_GridUserService.LoggedIn(userId);
                }
            }

            //
            // Get the region
            //
            destination = m_GridService.GetRegionByUUID(m_ScopeID, destination.RegionID);
            if (destination == null)
            {
                reason = "Destination region not found";
                return false;
            }

            m_log.DebugFormat(
                "[GATEKEEPER SERVICE]: Destination {0} is ok for {1}", destination.RegionName, aCircuit.Name);

            //
            // Adjust the visible name
            //
            if (account != null)
            {
                aCircuit.firstname = account.FirstName;
                aCircuit.lastname = account.LastName;
            }
            if (account == null)
            {
                if (!aCircuit.lastname.StartsWith("@"))
                    aCircuit.firstname = aCircuit.firstname + "." + aCircuit.lastname;
                try
                {
                    Uri uri = new Uri(aCircuit.ServiceURLs["HomeURI"].ToString());
                    aCircuit.lastname = "@" + uri.Authority;
                }
                catch
                {
                    m_log.WarnFormat("[GATEKEEPER SERVICE]: Malformed HomeURI (this should never happen): {0}", aCircuit.ServiceURLs["HomeURI"]);
                    aCircuit.lastname = "@" + aCircuit.ServiceURLs["HomeURI"].ToString();
                }
            }

            //
            // Finally launch the agent at the destination
            //
            Constants.TeleportFlags loginFlag = isFirstLogin ? Constants.TeleportFlags.ViaLogin : Constants.TeleportFlags.ViaHGLogin;

            // Preserve our TeleportFlags we have gathered so-far
            loginFlag |= (Constants.TeleportFlags) aCircuit.teleportFlags;

            m_log.DebugFormat("[GATEKEEPER SERVICE]: Launching {0}, Teleport Flags: {1}", aCircuit.Name, loginFlag);

            EntityTransferContext ctx = new EntityTransferContext();

            if (!m_SimulationService.QueryAccess(
                destination, aCircuit.AgentID, aCircuit.ServiceURLs["HomeURI"].ToString(), 
                true, aCircuit.startpos, new List<UUID>(), ctx, out reason))
                return false;

            return m_SimulationService.CreateAgent(source, destination, aCircuit, (uint)loginFlag, ctx, out reason);
        }

        protected bool Authenticate(AgentCircuitData aCircuit)
        {
            if (!CheckAddress(aCircuit.ServiceSessionID))
                return false;

            if (string.IsNullOrEmpty(aCircuit.IPAddress))
            {
                m_log.DebugFormat("[GATEKEEPER SERVICE]: Agent did not provide a client IP address.");
                return false;
            }

            string userURL = string.Empty;
            if (aCircuit.ServiceURLs.ContainsKey("HomeURI"))
                userURL = aCircuit.ServiceURLs["HomeURI"].ToString();

            if (userURL == string.Empty)
            {
                m_log.DebugFormat("[GATEKEEPER SERVICE]: Agent did not provide an authentication server URL");
                return false;
            }

            if (userURL == m_ExternalName)
            {
                return m_UserAgentService.VerifyAgent(aCircuit.SessionID, aCircuit.ServiceSessionID);
            }
            else
            {
                IUserAgentService userAgentService = new UserAgentServiceConnector(userURL); 

                try
                {
                    return userAgentService.VerifyAgent(aCircuit.SessionID, aCircuit.ServiceSessionID);
                }
                catch
                {
                    m_log.DebugFormat("[GATEKEEPER SERVICE]: Unable to contact authentication service at {0}", userURL);
                    return false;
                }
            }
        }

        // Check that the service token was generated for *this* grid.
        // If it wasn't then that's a fake agent.
        protected bool CheckAddress(string serviceToken)
        {
            string[] parts = serviceToken.Split(new char[] { ';' });
            if (parts.Length < 2)
                return false;

            char[] trailing_slash = new char[] { '/' };
            string addressee = parts[0].TrimEnd(trailing_slash);
            string externalname = m_ExternalName.TrimEnd(trailing_slash);
            m_log.DebugFormat("[GATEKEEPER SERVICE]: Verifying {0} against {1}", addressee, externalname);

            Uri uri;
            try
            {
                uri = new Uri(addressee);
            }
            catch
            {
                m_log.DebugFormat("[GATEKEEPER SERVICE]: Visitor provided malformed service address {0}", addressee);
                return false;
            }

            return string.Equals(uri.GetLeftPart(UriPartial.Authority), m_Uri.GetLeftPart(UriPartial.Authority), StringComparison.OrdinalIgnoreCase) ;
        }

        #endregion


        #region Misc

        private bool IsException(AgentCircuitData aCircuit, List<string> exceptions)
        {
            bool exception = false;
            if (exceptions.Count > 0) // we have exceptions
            {
                // Retrieve the visitor's origin
                string userURL = aCircuit.ServiceURLs["HomeURI"].ToString();
                if (!userURL.EndsWith("/"))
                    userURL += "/";

                if (exceptions.Find(delegate(string s)
                {
                    if (!s.EndsWith("/"))
                        s += "/";
                    return s == userURL;
                }) != null)
                    exception = true;
            }

            return exception;
        }

        #endregion
    }
}