1 /* +------------------------------------+
2 * | Inspire Internet Relay Chat Daemon |
3 * +------------------------------------+
5 * InspIRCd: (C) 2002-2007 InspIRCd Development Team
6 * See: http://www.inspircd.org/wiki/index.php/Credits
8 * This program is free but copyrighted software; see
9 * the file COPYING for details.
11 * ---------------------------------------------------
14 #include "inspircd_config.h"
15 #include "configreader.h"
23 /* $ModDesc: Provides masking of user hostnames */
24 /* $ModDep: m_hash.h */
26 /* Used to vary the output a little more depending on the cloak keys */
27 static const char* xtab[] = {"F92E45D871BCA630", "A1B9D80C72E653F4", "1ABC078934DEF562", "ABCDEF5678901234"};
29 /** Handles user mode +x
31 class CloakUser : public ModeHandler
42 /** This function takes a domain name string and returns just the last two domain parts,
43 * or the last domain part if only two are available. Failing that it just returns what it was given.
45 * For example, if it is passed "svn.inspircd.org" it will return ".inspircd.org".
46 * If it is passed "brainbox.winbot.co.uk" it will return ".co.uk",
47 * and if it is passed "localhost.localdomain" it will return ".localdomain".
49 * This is used to ensure a significant part of the host is always cloaked (see Bug #216)
51 std::string LastTwoDomainParts(const std::string &host)
54 std::string::size_type splitdot = host.length();
56 for (std::string::size_type x = host.length() - 1; x; --x)
67 if (splitdot == host.length())
70 return host.substr(splitdot);
74 CloakUser(InspIRCd* Instance, Module* Source, Module* Hash) : ModeHandler(Instance, 'x', 0, 0, false, MODETYPE_USER, false), Sender(Source), HashProvider(Hash)
78 ModeAction OnModeChange(userrec* source, userrec* dest, chanrec* channel, std::string ¶meter, bool adding)
80 /* Only opers can change other users modes */
81 if ((source != dest) && (!*source->oper))
82 return MODEACTION_DENY;
84 /* For remote clients, we dont take any action, we just allow it.
85 * The local server where they are will set their cloak instead.
88 return MODEACTION_ALLOW;
92 if(!dest->IsModeSet('x'))
94 /* The mode is being turned on - so attempt to
95 * allocate the user a cloaked host using a non-reversible
96 * algorithm (its simple, but its non-reversible so the
97 * simplicity doesnt really matter). This algorithm
98 * will not work if the user has only one level of domain
99 * naming in their hostname (e.g. if they are on a lan or
100 * are connecting via localhost) -- this doesnt matter much.
103 char* n1 = strchr(dest->host,'.');
104 char* n2 = strchr(dest->host,':');
108 /* InspIRCd users have two hostnames; A displayed
109 * hostname which can be modified by modules (e.g.
110 * to create vhosts, implement chghost, etc) and a
111 * 'real' hostname which you shouldnt write to.
114 unsigned int iv[] = { key1, key2, key3, key4 };
115 std::string a = LastTwoDomainParts(dest->host);
118 /** Reset the Hash module, and send it our IV and hex table */
119 HashResetRequest(Sender, HashProvider).Send();
120 HashKeyRequest(Sender, HashProvider, iv).Send();
121 HashHexRequest(Sender, HashProvider, xtab[(*dest->host) % 4]);
123 /* Generate a cloak using specialized Hash */
124 std::string hostcloak = prefix + "-" + std::string(HashSumRequest(Sender, HashProvider, dest->host).Send()).substr(0,8) + a;
126 /* Fix by brain - if the cloaked host is > the max length of a host (64 bytes
127 * according to the DNS RFC) then tough titty, they get cloaked as an IP.
128 * Their ISP shouldnt go to town on subdomains, or they shouldnt have a kiddie
134 if ((dest->GetProtocolFamily() == AF_INET6) && (inet_pton(AF_INET6,dest->host,&testaddr) < 1) && (hostcloak.length() <= 64))
135 /* Invalid ipv6 address, and ipv6 user (resolved host) */
137 else if ((dest->GetProtocolFamily() == AF_INET) && (inet_aton(dest->host,&testaddr2) < 1) && (hostcloak.length() <= 64))
138 /* Invalid ipv4 address, and ipv4 user (resolved host) */
141 /* Valid ipv6 or ipv4 address (not resolved) ipv4 or ipv6 user */
142 b = ((!strchr(dest->host,':')) ? Cloak4(dest->host) : Cloak6(dest->host));
145 if ((inet_aton(dest->host,&testaddr) < 1) && (hostcloak.length() <= 64))
146 /* Invalid ipv4 address, and ipv4 user (resolved host) */
149 /* Valid ipv4 address (not resolved) ipv4 user */
150 b = Cloak4(dest->host);
153 dest->ChangeDisplayedHost(b.c_str());
156 dest->SetMode('x',true);
157 return MODEACTION_ALLOW;
162 if (dest->IsModeSet('x'))
164 /* User is removing the mode, so just restore their real host
165 * and make it match the displayed one.
167 dest->ChangeDisplayedHost(dest->host);
168 dest->SetMode('x',false);
169 return MODEACTION_ALLOW;
173 return MODEACTION_DENY;
176 std::string Cloak4(const char* ip)
178 unsigned int iv[] = { key1, key2, key3, key4 };
179 irc::sepstream seps(ip, '.');
181 std::string octet[4];
184 for (int j = 0; j < 4; j++)
186 octet[j] = seps.GetToken();
187 i[j] = atoi(octet[j].c_str());
190 octet[3] = octet[0] + "." + octet[1] + "." + octet[2] + "." + octet[3];
191 octet[2] = octet[0] + "." + octet[1] + "." + octet[2];
192 octet[1] = octet[0] + "." + octet[1];
194 /* Reset the Hash module and send it our IV */
195 HashResetRequest(Sender, HashProvider).Send();
196 HashKeyRequest(Sender, HashProvider, iv).Send();
198 /* Send the Hash module a different hex table for each octet group's Hash sum */
199 for (int k = 0; k < 4; k++)
201 HashHexRequest(Sender, HashProvider, xtab[(iv[k]+i[k]) % 4]).Send();
202 ra[k] = std::string(HashSumRequest(Sender, HashProvider, octet[k]).Send()).substr(0,6);
204 /* Stick them all together */
205 return std::string().append(ra[0]).append(".").append(ra[1]).append(".").append(ra[2]).append(".").append(ra[3]);
208 std::string Cloak6(const char* ip)
210 /* Theyre using 4in6 (YUCK). Translate as ipv4 cloak */
211 if (!strncmp(ip, "0::ffff:", 8))
212 return Cloak4(ip + 8);
214 /* If we get here, yes it really is an ipv6 ip */
215 unsigned int iv[] = { key1, key2, key3, key4 };
216 std::vector<std::string> hashies;
217 std::string item = "";
220 /* Reset the Hash module and send it our IV */
221 HashResetRequest(Sender, HashProvider).Send();
222 HashKeyRequest(Sender, HashProvider, iv).Send();
224 for (const char* input = ip; *input; input++)
227 if (item.length() > 4)
229 /* Send the Hash module a different hex table for each octet group's Hash sum */
230 HashHexRequest(Sender, HashProvider, xtab[(key1+rounds) % 4]).Send();
231 hashies.push_back(std::string(HashSumRequest(Sender, HashProvider, item).Send()).substr(0,8));
238 /* Send the Hash module a different hex table for each octet group's Hash sum */
239 HashHexRequest(Sender, HashProvider, xtab[(key1+rounds) % 4]).Send();
240 hashies.push_back(std::string(HashSumRequest(Sender, HashProvider, item).Send()).substr(0,8));
243 /* Stick them all together */
244 return irc::stringjoiner(":", hashies, 0, hashies.size() - 1).GetJoined();
249 ConfigReader Conf(ServerInstance);
250 key1 = key2 = key3 = key4 = 0;
251 key1 = Conf.ReadInteger("cloak","key1",0,true);
252 key2 = Conf.ReadInteger("cloak","key2",0,true);
253 key3 = Conf.ReadInteger("cloak","key3",0,true);
254 key4 = Conf.ReadInteger("cloak","key4",0,true);
255 prefix = Conf.ReadValue("cloak","prefix",0);
258 prefix = ServerInstance->Config->Network;
260 if (!key1 && !key2 && !key3 && !key4)
261 throw ModuleException("You have not defined cloak keys for m_cloaking!!! THIS IS INSECURE AND SHOULD BE CHECKED!");
266 class ModuleCloaking : public Module
274 ModuleCloaking(InspIRCd* Me)
277 ServerInstance->UseInterface("HashRequest");
279 /* Attempt to locate the md5 service provider, bail if we can't find it */
280 HashModule = ServerInstance->FindModule("m_md5.so");
282 throw ModuleException("Can't find m_md5.so. Please load m_md5.so before m_cloaking.so.");
284 /* Create new mode handler object */
285 cu = new CloakUser(ServerInstance, this, HashModule);
287 /* Register it with the core */
288 if (!ServerInstance->AddMode(cu, 'x'))
289 throw ModuleException("Could not add new modes!");
294 virtual ~ModuleCloaking()
296 ServerInstance->Modes->DelMode(cu);
298 ServerInstance->DoneWithInterface("HashRequest");
301 virtual Version GetVersion()
303 // returns the version number of the module to be
304 // listed in /MODULES
305 return Version(1,1,0,2,VF_COMMON|VF_VENDOR,API_VERSION);
308 virtual void OnRehash(userrec* user, const std::string ¶meter)
313 void Implements(char* List)
315 List[I_OnRehash] = 1;
319 // stuff down here is the module-factory stuff. For basic modules you can ignore this.
321 class ModuleCloakingFactory : public ModuleFactory
324 ModuleCloakingFactory()
328 ~ModuleCloakingFactory()
332 virtual Module * CreateModule(InspIRCd* Me)
334 return new ModuleCloaking(Me);
340 extern "C" void * init_module( void )
342 return new ModuleCloakingFactory;