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Resolve /STATS S conflict between SVSHOLD and SHUN
[user/henk/code/inspircd.git] / src / modules / m_cgiirc.cpp
1 /*       +------------------------------------+
2  *       | Inspire Internet Relay Chat Daemon |
3  *       +------------------------------------+
4  *
5  *  InspIRCd: (C) 2002-2010 InspIRCd Development Team
6  * See: http://wiki.inspircd.org/Credits
7  *
8  * This program is free but copyrighted software; see
9  *            the file COPYING for details.
10  *
11  * ---------------------------------------------------
12  */
13
14 #include "inspircd.h"
15
16 #ifndef WINDOWS
17 #include <sys/socket.h>
18 #include <netinet/in.h>
19 #include <arpa/inet.h>
20 #endif
21
22 /* $ModDesc: Change user's hosts connecting from known CGI:IRC hosts */
23
24 enum CGItype { INVALID, PASS, IDENT, PASSFIRST, IDENTFIRST, WEBIRC };
25
26
27 /** Holds a CGI site's details
28  */
29 class CGIhost
30 {
31 public:
32         std::string hostmask;
33         CGItype type;
34         std::string password;
35
36         CGIhost(const std::string &mask = "", CGItype t = IDENTFIRST, const std::string &spassword ="")
37         : hostmask(mask), type(t), password(spassword)
38         {
39         }
40 };
41 typedef std::vector<CGIhost> CGIHostlist;
42
43 /*
44  * WEBIRC
45  *  This is used for the webirc method of CGIIRC auth, and is (really) the best way to do these things.
46  *  Syntax: WEBIRC password client hostname ip
47  *  Where password is a shared key, client is the name of the "client" and version (e.g. cgiirc), hostname
48  *  is the resolved host of the client issuing the command and IP is the real IP of the client.
49  *
50  * How it works:
51  *  To tie in with the rest of cgiirc module, and to avoid race conditions, /webirc is only processed locally
52  *  and simply sets metadata on the user, which is later decoded on full connect to give something meaningful.
53  */
54 class CommandWebirc : public Command
55 {
56  public:
57         bool notify;
58         StringExtItem realhost;
59         StringExtItem realip;
60         LocalStringExt webirc_hostname;
61         LocalStringExt webirc_ip;
62
63         CGIHostlist Hosts;
64         CommandWebirc(Module* Creator)
65                 : Command(Creator, "WEBIRC", 4),
66                   realhost("cgiirc_realhost", Creator), realip("cgiirc_realip", Creator),
67                   webirc_hostname("cgiirc_webirc_hostname", Creator), webirc_ip("cgiirc_webirc_ip", Creator)
68                 {
69                         works_before_reg = true;
70                         this->syntax = "password client hostname ip";
71                 }
72                 CmdResult Handle(const std::vector<std::string> &parameters, User *user)
73                 {
74                         if(user->registered == REG_ALL)
75                                 return CMD_FAILURE;
76
77                         for(CGIHostlist::iterator iter = Hosts.begin(); iter != Hosts.end(); iter++)
78                         {
79                                 if(InspIRCd::Match(user->host, iter->hostmask, ascii_case_insensitive_map) || InspIRCd::MatchCIDR(user->GetIPString(), iter->hostmask, ascii_case_insensitive_map))
80                                 {
81                                         if(iter->type == WEBIRC && parameters[0] == iter->password)
82                                         {
83                                                 realhost.set(user, user->host);
84                                                 realip.set(user, user->GetIPString());
85                                                 if (notify)
86                                                         ServerInstance->SNO->WriteGlobalSno('a', "Connecting user %s detected as using CGI:IRC (%s), changing real host to %s from %s", user->nick.c_str(), user->host.c_str(), parameters[2].c_str(), user->host.c_str());
87                                                 webirc_hostname.set(user, parameters[2]);
88                                                 webirc_ip.set(user, parameters[3]);
89                                                 return CMD_SUCCESS;
90                                         }
91                                 }
92                         }
93
94                         ServerInstance->SNO->WriteGlobalSno('a', "Connecting user %s tried to use WEBIRC, but didn't match any configured webirc blocks.", user->GetFullRealHost().c_str());
95                         return CMD_FAILURE;
96                 }
97 };
98
99
100 /** Resolver for CGI:IRC hostnames encoded in ident/GECOS
101  */
102 class CGIResolver : public Resolver
103 {
104         std::string typ;
105         std::string theiruid;
106         LocalIntExt& waiting;
107         bool notify;
108  public:
109         CGIResolver(Module* me, bool NotifyOpers, const std::string &source, bool forward, LocalUser* u,
110                         const std::string &type, bool &cached, LocalIntExt& ext)
111                 : Resolver(source, forward ? DNS_QUERY_A : DNS_QUERY_PTR4, cached, me), typ(type), theiruid(u->uuid),
112                 waiting(ext), notify(NotifyOpers)
113         {
114         }
115
116         virtual void OnLookupComplete(const std::string &result, unsigned int ttl, bool cached)
117         {
118                 /* Check the user still exists */
119                 User* them = ServerInstance->FindUUID(theiruid);
120                 if (them)
121                 {
122                         if (notify)
123                                 ServerInstance->SNO->WriteGlobalSno('a', "Connecting user %s detected as using CGI:IRC (%s), changing real host to %s from %s", them->nick.c_str(), them->host.c_str(), result.c_str(), typ.c_str());
124
125                         if (result.length() > 64)
126                                 return;
127                         them->host = result;
128                         them->dhost = result;
129                         them->InvalidateCache();
130                         them->CheckLines(true);
131                 }
132         }
133
134         virtual void OnError(ResolverError e, const std::string &errormessage)
135         {
136                 User* them = ServerInstance->FindUUID(theiruid);
137                 if (them)
138                 {
139                         if (notify)
140                                 ServerInstance->SNO->WriteToSnoMask('a', "Connecting user %s detected as using CGI:IRC (%s), but their host can't be resolved from their %s!", them->nick.c_str(), them->host.c_str(), typ.c_str());
141                 }
142         }
143
144         virtual ~CGIResolver()
145         {
146                 User* them = ServerInstance->FindUUID(theiruid);
147                 if (!them)
148                         return;
149                 int count = waiting.get(them);
150                 if (count)
151                         waiting.set(them, count - 1);
152         }
153 };
154
155 class ModuleCgiIRC : public Module
156 {
157         CommandWebirc cmd;
158         LocalIntExt waiting;
159 public:
160         ModuleCgiIRC() : cmd(this), waiting("cgiirc-delay", this)
161         {
162         }
163
164         void init()
165         {
166                 OnRehash(NULL);
167                 ServerInstance->AddCommand(&cmd);
168                 ServerInstance->Extensions.Register(&cmd.realhost);
169                 ServerInstance->Extensions.Register(&cmd.realip);
170                 ServerInstance->Extensions.Register(&cmd.webirc_hostname);
171                 ServerInstance->Extensions.Register(&cmd.webirc_ip);
172
173                 Implementation eventlist[] = { I_OnRehash, I_OnUserRegister, I_OnCheckReady, I_OnUserConnect };
174                 ServerInstance->Modules->Attach(eventlist, this, 4);
175         }
176
177         void Prioritize()
178         {
179                 ServerInstance->Modules->SetPriority(this, I_OnUserConnect, PRIORITY_FIRST);
180                 Module* umodes = ServerInstance->Modules->Find("m_conn_umodes.so");
181                 ServerInstance->Modules->SetPriority(this, I_OnUserConnect, PRIORITY_BEFORE, &umodes);
182         }
183
184         void OnRehash(User* user)
185         {
186                 cmd.Hosts.clear();
187
188                 // Do we send an oper notice when a CGI:IRC has their host changed?
189                 cmd.notify = ServerInstance->Config->ConfValue("cgiirc")->getBool("opernotice", true);
190
191                 ConfigTagList tags = ServerInstance->Config->ConfTags("cgihost");
192                 for (ConfigIter i = tags.first; i != tags.second; ++i)
193                 {
194                         ConfigTag* tag = i->second;
195                         std::string hostmask = tag->getString("mask"); // An allowed CGI:IRC host
196                         std::string type = tag->getString("type"); // What type of user-munging we do on this host.
197                         std::string password = tag->getString("password");
198
199                         if(hostmask.length())
200                         {
201                                 if (type == "webirc" && !password.length()) {
202                                                 ServerInstance->Logs->Log("CONFIG",DEFAULT, "m_cgiirc: Missing password in config: %s", hostmask.c_str());
203                                 }
204                                 else
205                                 {
206                                         CGItype cgitype = INVALID;
207                                         if (type == "pass")
208                                                 cgitype = PASS;
209                                         else if (type == "ident")
210                                                 cgitype = IDENT;
211                                         else if (type == "passfirst")
212                                                 cgitype = PASSFIRST;
213                                         else if (type == "webirc")
214                                         {
215                                                 cgitype = WEBIRC;
216                                         }
217
218                                         if (cgitype == INVALID)
219                                                 cgitype = PASS;
220
221                                         cmd.Hosts.push_back(CGIhost(hostmask,cgitype, password.length() ? password : "" ));
222                                 }
223                         }
224                         else
225                         {
226                                 ServerInstance->Logs->Log("CONFIG",DEFAULT, "m_cgiirc.so: Invalid <cgihost:mask> value in config: %s", hostmask.c_str());
227                                 continue;
228                         }
229                 }
230         }
231
232         ModResult OnCheckReady(LocalUser *user)
233         {
234                 if (waiting.get(user))
235                         return MOD_RES_DENY;
236                 return MOD_RES_PASSTHRU;
237         }
238
239         ModResult OnUserRegister(LocalUser* user)
240         {
241                 for(CGIHostlist::iterator iter = cmd.Hosts.begin(); iter != cmd.Hosts.end(); iter++)
242                 {
243                         if(InspIRCd::Match(user->host, iter->hostmask, ascii_case_insensitive_map) || InspIRCd::MatchCIDR(user->GetIPString(), iter->hostmask, ascii_case_insensitive_map))
244                         {
245                                 // Deal with it...
246                                 if(iter->type == PASS)
247                                 {
248                                         CheckPass(user); // We do nothing if it fails so...
249                                         user->CheckLines(true);
250                                 }
251                                 else if(iter->type == PASSFIRST && !CheckPass(user))
252                                 {
253                                         // If the password lookup failed, try the ident
254                                         CheckIdent(user);       // If this fails too, do nothing
255                                         user->CheckLines(true);
256                                 }
257                                 else if(iter->type == IDENT)
258                                 {
259                                         CheckIdent(user); // Nothing on failure.
260                                         user->CheckLines(true);
261                                 }
262                                 else if(iter->type == IDENTFIRST && !CheckIdent(user))
263                                 {
264                                         // If the ident lookup fails, try the password.
265                                         CheckPass(user);
266                                         user->CheckLines(true);
267                                 }
268                                 else if(iter->type == WEBIRC)
269                                 {
270                                         // We don't need to do anything here
271                                 }
272                                 return MOD_RES_PASSTHRU;
273                         }
274                 }
275                 return MOD_RES_PASSTHRU;
276         }
277
278         virtual void OnUserConnect(LocalUser* user)
279         {
280                 std::string *webirc_hostname = cmd.webirc_hostname.get(user);
281                 std::string *webirc_ip = cmd.webirc_ip.get(user);
282                 if (!webirc_ip)
283                         return;
284                 ServerInstance->Users->RemoveCloneCounts(user);
285                 user->SetClientIP(webirc_ip->c_str());
286                 user->InvalidateCache();
287                 if (webirc_hostname && webirc_hostname->length() < 64)
288                         user->host = user->dhost = *webirc_hostname;
289                 else
290                         user->host = user->dhost = user->GetIPString();
291                 user->InvalidateCache();
292                 ServerInstance->Users->AddLocalClone(user);
293                 ServerInstance->Users->AddGlobalClone(user);
294                 user->SetClass();
295                 user->CheckClass();
296                 user->CheckLines(true);
297                 cmd.webirc_ip.unset(user);
298                 cmd.webirc_hostname.unset(user);
299         }
300
301         bool CheckPass(LocalUser* user)
302         {
303                 if(IsValidHost(user->password))
304                 {
305                         cmd.realhost.set(user, user->host);
306                         cmd.realip.set(user, user->GetIPString());
307                         user->host = user->password;
308                         user->dhost = user->password;
309                         user->InvalidateCache();
310
311                         ServerInstance->Users->RemoveCloneCounts(user);
312                         user->SetClientIP(user->password.c_str());
313                         ServerInstance->Users->AddLocalClone(user);
314                         ServerInstance->Users->AddGlobalClone(user);
315                         user->SetClass();
316                         user->CheckClass();
317
318                         try
319                         {
320                                 bool cached;
321                                 CGIResolver* r = new CGIResolver(this, cmd.notify, user->password, false, user, "PASS", cached, waiting);
322                                 ServerInstance->AddResolver(r, cached);
323                                 waiting.set(user, waiting.get(user) + 1);
324                         }
325                         catch (...)
326                         {
327                                 if (cmd.notify)
328                                         ServerInstance->SNO->WriteToSnoMask('a', "Connecting user %s detected as using CGI:IRC (%s), but I could not resolve their hostname!", user->nick.c_str(), user->host.c_str());
329                         }
330
331                         user->password.clear();
332                         return true;
333                 }
334
335                 return false;
336         }
337
338         bool CheckIdent(LocalUser* user)
339         {
340                 const char* ident;
341                 int len = user->ident.length();
342                 in_addr newip;
343
344                 if(len == 8)
345                         ident = user->ident.c_str();
346                 else if(len == 9 && user->ident[0] == '~')
347                         ident = user->ident.c_str() + 1;
348                 else
349                         return false;
350
351                 errno = 0;
352                 unsigned long ipaddr = strtoul(ident, NULL, 16);
353                 if (errno)
354                         return false;
355                 newip.s_addr = htonl(ipaddr);
356                 char* newipstr = inet_ntoa(newip);
357
358                 cmd.realhost.set(user, user->host);
359                 cmd.realip.set(user, user->GetIPString());
360                 ServerInstance->Users->RemoveCloneCounts(user);
361                 user->SetClientIP(newipstr);
362                 ServerInstance->Users->AddLocalClone(user);
363                 ServerInstance->Users->AddGlobalClone(user);
364                 user->SetClass();
365                 user->CheckClass();
366                 user->host = newipstr;
367                 user->dhost = newipstr;
368                 user->ident.assign("~cgiirc", 0, 8);
369                 try
370                 {
371
372                         bool cached;
373                         CGIResolver* r = new CGIResolver(this, cmd.notify, newipstr, false, user, "IDENT", cached, waiting);
374                         ServerInstance->AddResolver(r, cached);
375                         waiting.set(user, waiting.get(user) + 1);
376                 }
377                 catch (...)
378                 {
379                         user->InvalidateCache();
380
381                         if(cmd.notify)
382                                  ServerInstance->SNO->WriteToSnoMask('a', "Connecting user %s detected as using CGI:IRC (%s), but I could not resolve their hostname!", user->nick.c_str(), user->host.c_str());
383                 }
384
385                 return true;
386         }
387
388         bool IsValidHost(const std::string &host)
389         {
390                 if(!host.size() || host.size() > 64)
391                         return false;
392
393                 for(unsigned int i = 0; i < host.size(); i++)
394                 {
395                         if(     ((host[i] >= '0') && (host[i] <= '9')) ||
396                                         ((host[i] >= 'A') && (host[i] <= 'Z')) ||
397                                         ((host[i] >= 'a') && (host[i] <= 'z')) ||
398                                         ((host[i] == '-') && (i > 0) && (i+1 < host.size()) && (host[i-1] != '.') && (host[i+1] != '.')) ||
399                                         ((host[i] == '.') && (i > 0) && (i+1 < host.size())) )
400
401                                 continue;
402                         else
403                                 return false;
404                 }
405
406                 return true;
407         }
408
409         bool IsValidIP(const std::string &ip)
410         {
411                 if(ip.size() < 7 || ip.size() > 15)
412                         return false;
413
414                 short sincedot = 0;
415                 short dots = 0;
416
417                 for(unsigned int i = 0; i < ip.size(); i++)
418                 {
419                         if((dots <= 3) && (sincedot <= 3))
420                         {
421                                 if((ip[i] >= '0') && (ip[i] <= '9'))
422                                 {
423                                         sincedot++;
424                                 }
425                                 else if(ip[i] == '.')
426                                 {
427                                         sincedot = 0;
428                                         dots++;
429                                 }
430                         }
431                         else
432                         {
433                                 return false;
434
435                         }
436                 }
437
438                 if(dots != 3)
439                         return false;
440
441                 return true;
442         }
443
444         virtual ~ModuleCgiIRC()
445         {
446         }
447
448         virtual Version GetVersion()
449         {
450                 return Version("Change user's hosts connecting from known CGI:IRC hosts",VF_VENDOR);
451         }
452
453 };
454
455 MODULE_INIT(ModuleCgiIRC)