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 * ---------------------------------------------------
20 /* $ModDesc: Provides masking of user hostnames */
21 /* $ModDep: m_hash.h */
23 /* Used to vary the output a little more depending on the cloak keys */
24 static const char* xtab[] = {"F92E45D871BCA630", "A1B9D80C72E653F4", "1ABC078934DEF562", "ABCDEF5678901234"};
26 /** Handles user mode +x
28 class CloakUser : public ModeHandler
39 /** This function takes a domain name string and returns just the last two domain parts,
40 * or the last domain part if only two are available. Failing that it just returns what it was given.
42 * For example, if it is passed "svn.inspircd.org" it will return ".inspircd.org".
43 * If it is passed "brainbox.winbot.co.uk" it will return ".co.uk",
44 * and if it is passed "localhost.localdomain" it will return ".localdomain".
46 * This is used to ensure a significant part of the host is always cloaked (see Bug #216)
48 std::string LastTwoDomainParts(const std::string &host)
51 std::string::size_type splitdot = host.length();
53 for (std::string::size_type x = host.length() - 1; x; --x)
64 if (splitdot == host.length())
67 return host.substr(splitdot);
71 CloakUser(InspIRCd* Instance, Module* Source, Module* Hash) : ModeHandler(Instance, 'x', 0, 0, false, MODETYPE_USER, false), Sender(Source), HashProvider(Hash)
75 ModeAction OnModeChange(userrec* source, userrec* dest, chanrec* channel, std::string ¶meter, bool adding)
78 return MODEACTION_DENY;
80 /* For remote clients, we dont take any action, we just allow it.
81 * The local server where they are will set their cloak instead.
84 return MODEACTION_ALLOW;
88 if(!dest->IsModeSet('x'))
90 /* The mode is being turned on - so attempt to
91 * allocate the user a cloaked host using a non-reversible
92 * algorithm (its simple, but its non-reversible so the
93 * simplicity doesnt really matter). This algorithm
94 * will not work if the user has only one level of domain
95 * naming in their hostname (e.g. if they are on a lan or
96 * are connecting via localhost) -- this doesnt matter much.
99 char* n1 = strchr(dest->host,'.');
100 char* n2 = strchr(dest->host,':');
104 /* InspIRCd users have two hostnames; A displayed
105 * hostname which can be modified by modules (e.g.
106 * to create vhosts, implement chghost, etc) and a
107 * 'real' hostname which you shouldnt write to.
110 unsigned int iv[] = { key1, key2, key3, key4 };
111 std::string a = LastTwoDomainParts(dest->host);
114 /** Reset the Hash module, and send it our IV and hex table */
115 HashResetRequest(Sender, HashProvider).Send();
116 HashKeyRequest(Sender, HashProvider, iv).Send();
117 HashHexRequest(Sender, HashProvider, xtab[(*dest->host) % 4]);
119 /* Generate a cloak using specialized Hash */
120 std::string hostcloak = prefix + "-" + std::string(HashSumRequest(Sender, HashProvider, dest->host).Send()).substr(0,8) + a;
122 /* Fix by brain - if the cloaked host is > the max length of a host (64 bytes
123 * according to the DNS RFC) then tough titty, they get cloaked as an IP.
124 * Their ISP shouldnt go to town on subdomains, or they shouldnt have a kiddie
130 if ((dest->GetProtocolFamily() == AF_INET6) && (inet_pton(AF_INET6,dest->host,&testaddr) < 1) && (hostcloak.length() <= 64))
131 /* Invalid ipv6 address, and ipv6 user (resolved host) */
133 else if ((dest->GetProtocolFamily() == AF_INET) && (inet_aton(dest->host,&testaddr2) < 1) && (hostcloak.length() <= 64))
134 /* Invalid ipv4 address, and ipv4 user (resolved host) */
137 /* Valid ipv6 or ipv4 address (not resolved) ipv4 or ipv6 user */
138 b = ((!strchr(dest->host,':')) ? Cloak4(dest->host) : Cloak6(dest->host));
141 if ((inet_aton(dest->host,&testaddr) < 1) && (hostcloak.length() <= 64))
142 /* Invalid ipv4 address, and ipv4 user (resolved host) */
145 /* Valid ipv4 address (not resolved) ipv4 user */
146 b = Cloak4(dest->host);
149 dest->ChangeDisplayedHost(b.c_str());
152 dest->SetMode('x',true);
153 return MODEACTION_ALLOW;
158 if (dest->IsModeSet('x'))
160 /* User is removing the mode, so just restore their real host
161 * and make it match the displayed one.
163 dest->ChangeDisplayedHost(dest->host);
164 dest->SetMode('x',false);
165 return MODEACTION_ALLOW;
169 return MODEACTION_DENY;
172 std::string Cloak4(const char* ip)
174 unsigned int iv[] = { key1, key2, key3, key4 };
175 irc::sepstream seps(ip, '.');
177 std::string octet[4];
180 for (int j = 0; j < 4; j++)
182 octet[j] = seps.GetToken();
183 i[j] = atoi(octet[j].c_str());
186 octet[3] = octet[0] + "." + octet[1] + "." + octet[2] + "." + octet[3];
187 octet[2] = octet[0] + "." + octet[1] + "." + octet[2];
188 octet[1] = octet[0] + "." + octet[1];
190 /* Reset the Hash module and send it our IV */
191 HashResetRequest(Sender, HashProvider).Send();
192 HashKeyRequest(Sender, HashProvider, iv).Send();
194 /* Send the Hash module a different hex table for each octet group's Hash sum */
195 for (int k = 0; k < 4; k++)
197 HashHexRequest(Sender, HashProvider, xtab[(iv[k]+i[k]) % 4]).Send();
198 ra[k] = std::string(HashSumRequest(Sender, HashProvider, octet[k]).Send()).substr(0,6);
200 /* Stick them all together */
201 return std::string().append(ra[0]).append(".").append(ra[1]).append(".").append(ra[2]).append(".").append(ra[3]);
204 std::string Cloak6(const char* ip)
206 /* Theyre using 4in6 (YUCK). Translate as ipv4 cloak */
207 if (!strncmp(ip, "0::ffff:", 8))
208 return Cloak4(ip + 8);
210 /* If we get here, yes it really is an ipv6 ip */
211 unsigned int iv[] = { key1, key2, key3, key4 };
212 std::vector<std::string> hashies;
216 /* Reset the Hash module and send it our IV */
217 HashResetRequest(Sender, HashProvider).Send();
218 HashKeyRequest(Sender, HashProvider, iv).Send();
220 for (const char* input = ip; *input; input++)
223 if (item.length() > 7)
225 /* Send the Hash module a different hex table for each octet group's Hash sum */
226 HashHexRequest(Sender, HashProvider, xtab[(key1+rounds) % 4]).Send();
227 hashies.push_back(std::string(HashSumRequest(Sender, HashProvider, item).Send()).substr(0,8));
234 /* Send the Hash module a different hex table for each octet group's Hash sum */
235 HashHexRequest(Sender, HashProvider, xtab[(key1+rounds) % 4]).Send();
236 hashies.push_back(std::string(HashSumRequest(Sender, HashProvider, item).Send()).substr(0,8));
239 /* Stick them all together */
240 return irc::stringjoiner(":", hashies, 0, hashies.size() - 1).GetJoined();
245 ConfigReader Conf(ServerInstance);
246 key1 = key2 = key3 = key4 = 0;
247 key1 = Conf.ReadInteger("cloak","key1",0,true);
248 key2 = Conf.ReadInteger("cloak","key2",0,true);
249 key3 = Conf.ReadInteger("cloak","key3",0,true);
250 key4 = Conf.ReadInteger("cloak","key4",0,true);
251 prefix = Conf.ReadValue("cloak","prefix",0);
254 prefix = ServerInstance->Config->Network;
256 if (!key1 && !key2 && !key3 && !key4)
257 throw ModuleException("You have not defined cloak keys for m_cloaking!!! THIS IS INSECURE AND SHOULD BE CHECKED!");
262 class ModuleCloaking : public Module
270 ModuleCloaking(InspIRCd* Me)
273 ServerInstance->UseInterface("HashRequest");
275 /* Attempt to locate the md5 service provider, bail if we can't find it */
276 HashModule = ServerInstance->FindModule("m_md5.so");
278 throw ModuleException("Can't find m_md5.so. Please load m_md5.so before m_cloaking.so.");
280 /* Create new mode handler object */
281 cu = new CloakUser(ServerInstance, this, HashModule);
283 /* Register it with the core */
284 if (!ServerInstance->AddMode(cu, 'x'))
285 throw ModuleException("Could not add new modes!");
290 virtual ~ModuleCloaking()
292 ServerInstance->Modes->DelMode(cu);
294 ServerInstance->DoneWithInterface("HashRequest");
297 virtual Version GetVersion()
299 // returns the version number of the module to be
300 // listed in /MODULES
301 return Version(1,1,0,2,VF_COMMON|VF_VENDOR,API_VERSION);
304 virtual void OnRehash(userrec* user, const std::string ¶meter)
309 void Implements(char* List)
311 List[I_OnRehash] = 1;
315 MODULE_INIT(ModuleCloaking)