X-Git-Url: https://git.netwichtig.de/gitweb/?a=blobdiff_plain;f=src%2Fmodules%2Fm_cloaking.cpp;h=f9b6734ce89f3f5a478ea81c5e060bfd835f3f1c;hb=7f00015727fab50e37de46aa90d218b31c852c87;hp=7639b16512b40c317fa62d847d4a600560416187;hpb=e8b5c0d9f9103f84384fe9b0d89301ecbf16c3e6;p=user%2Fhenk%2Fcode%2Finspircd.git diff --git a/src/modules/m_cloaking.cpp b/src/modules/m_cloaking.cpp index 7639b1651..f9b6734ce 100644 --- a/src/modules/m_cloaking.cpp +++ b/src/modules/m_cloaking.cpp @@ -1,140 +1,319 @@ -// Hostname cloaking (+x mode) module for inspircd. -// version 1.0.0.1 by brain (C. J. Edwards) Mar 2004. -// -// When loaded this module will automatically set the -// +x mode on all connecting clients. -// -// Setting +x on a client causes the module to change the -// dhost entry (displayed host) for each user who has the -// mode, cloaking their host. Unlike unreal, the algorithm -// is non-reversible as uncloaked hosts are passed along -// the server->server link, and all encoding of hosts is -// done locally on the server by this module. - -#include +/* +------------------------------------+ + * | Inspire Internet Relay Chat Daemon | + * +------------------------------------+ + * + * InspIRCd: (C) 2002-2007 InspIRCd Development Team + * See: http://www.inspircd.org/wiki/index.php/Credits + * + * This program is free but copyrighted software; see + * the file COPYING for details. + * + * --------------------------------------------------- + */ + +#include "inspircd_config.h" +#include "configreader.h" +#include "inspircd.h" #include "users.h" #include "channels.h" #include "modules.h" +#include "m_hash.h" + /* $ModDesc: Provides masking of user hostnames */ +/* $ModDep: m_hash.h */ -class ModuleCloaking : public Module +/* Used to vary the output a little more depending on the cloak keys */ +static const char* xtab[] = {"F92E45D871BCA630", "A1B9D80C72E653F4", "1ABC078934DEF562", "ABCDEF5678901234"}; + +/** Handles user mode +x + */ +class CloakUser : public ModeHandler { - private: + + std::string prefix; + unsigned int key1; + unsigned int key2; + unsigned int key3; + unsigned int key4; + Module* Sender; + Module* HashProvider; - Server *Srv; - - public: - ModuleCloaking() + /** This function takes a domain name string and returns just the last two domain parts, + * or the last domain part if only two are available. Failing that it just returns what it was given. + * + * For example, if it is passed "svn.inspircd.org" it will return ".inspircd.org". + * If it is passed "brainbox.winbot.co.uk" it will return ".co.uk", + * and if it is passed "localhost.localdomain" it will return ".localdomain". + * + * This is used to ensure a significant part of the host is always cloaked (see Bug #216) + */ + std::string LastTwoDomainParts(const std::string &host) { - // We must create an instance of the Server class to work with - Srv = new Server; - - // we must create a new mode. Set the parameters so the - // mode doesn't require oper, and is a client usermode - // with no parameters (actually, you cant have params for a umode!) - if (!Srv->AddExtendedMode('x',MT_CLIENT,false,0,0)) + int dots = 0; + std::string::size_type splitdot = host.length(); + + for (std::string::size_type x = host.length() - 1; x; --x) { - // we couldn't claim mode x... possibly anther module has it, - // this might become likely to happen if there are a lot of 3rd - // party modules around in the future -- any 3rd party modules - // SHOULD implement a system of configurable mode letters (e.g. - // from a config file) - Srv->Log(DEFAULT,"*** m_cloaking: ERROR, failed to allocate user mode +x!"); - printf("Could not claim usermode +x for this module!"); - exit(0); + if (host[x] == '.') + { + splitdot = x; + dots++; + } + if (dots >= 3) + break; } + + if (splitdot == host.length()) + return host; + else + return host.substr(splitdot); } - virtual ~ModuleCloaking() - { - // not really neccessary, but free it anyway - delete Srv; - } - - virtual Version GetVersion() + public: + CloakUser(InspIRCd* Instance, Module* Source, Module* Hash) : ModeHandler(Instance, 'x', 0, 0, false, MODETYPE_USER, false), Sender(Source), HashProvider(Hash) { - // returns the version number of the module to be - // listed in /MODULES - return Version(1,0,0,1); } - - virtual int OnExtendedMode(userrec* user, void* target, char modechar, int type, bool mode_on, string_list ¶ms) + + ModeAction OnModeChange(userrec* source, userrec* dest, chanrec* channel, std::string ¶meter, bool adding) { - // this method is called for any extended mode character. - // all module modes for all modules pass through here - // (unless another module further up the chain claims them) - // so we must be VERY careful to only act upon modes which - // we have claimed ourselves. This is a feature to allow - // modules to 'spy' on extended mode activity if they so wish. - if ((modechar == 'x') && (type == MT_CLIENT)) - { - // OnExtendedMode gives us a void* as the target, we must cast - // it into a userrec* or a chanrec* depending on the value of - // the 'type' parameter (MT_CLIENT or MT_CHANNEL) - userrec* dest = (userrec*)target; - - // we've now determined that this is our mode character... - // is the user adding the mode to their list or removing it? - if (mode_on) + /* Only opers can change other users modes */ + if ((source != dest) && (!*source->oper)) + return MODEACTION_DENY; + + /* For remote clients, we dont take any action, we just allow it. + * The local server where they are will set their cloak instead. + */ + if (!IS_LOCAL(dest)) + return MODEACTION_ALLOW; + + if (adding) + { + if(!dest->IsModeSet('x')) { - // the mode is being turned on - so attempt to - // allocate the user a cloaked host using a non-reversible - // algorithm (its simple, but its non-reversible so the - // simplicity doesnt really matter). This algorithm - // will not work if the user has only one level of domain - // naming in their hostname (e.g. if they are on a lan or - // are connecting via localhost) -- this doesnt matter much. - if (strstr(dest->host,".")) + /* The mode is being turned on - so attempt to + * allocate the user a cloaked host using a non-reversible + * algorithm (its simple, but its non-reversible so the + * simplicity doesnt really matter). This algorithm + * will not work if the user has only one level of domain + * naming in their hostname (e.g. if they are on a lan or + * are connecting via localhost) -- this doesnt matter much. + */ + + char* n1 = strchr(dest->host,'.'); + char* n2 = strchr(dest->host,':'); + + if (n1 || n2) { - // in inspircd users have two hostnames. A displayed - // hostname which can be modified by modules (e.g. - // to create vhosts, implement chghost, etc) and a - // 'real' hostname which you shouldnt write to. - std::string a = strstr(dest->host,"."); - char ra[64]; - long seed,s2; - memcpy(&seed,dest->host,sizeof(long)); - memcpy(&s2,a.c_str(),sizeof(long)); - sprintf(ra,"%.8X",seed*s2*strlen(dest->host)); - std::string b = Srv->GetNetworkName() + "-" + ra + a; - Srv->Log(DEBUG,"cloak: allocated "+b); - Srv->ChangeHost(user,b); + /* InspIRCd users have two hostnames; A displayed + * hostname which can be modified by modules (e.g. + * to create vhosts, implement chghost, etc) and a + * 'real' hostname which you shouldnt write to. + */ + + unsigned int iv[] = { key1, key2, key3, key4 }; + std::string a = LastTwoDomainParts(dest->host); + std::string b; + + /** Reset the Hash module, and send it our IV and hex table */ + HashResetRequest(Sender, HashProvider).Send(); + HashKeyRequest(Sender, HashProvider, iv).Send(); + HashHexRequest(Sender, HashProvider, xtab[(*dest->host) % 4]); + + /* Generate a cloak using specialized Hash */ + std::string hostcloak = prefix + "-" + std::string(HashSumRequest(Sender, HashProvider, dest->host).Send()).substr(0,8) + a; + + /* Fix by brain - if the cloaked host is > the max length of a host (64 bytes + * according to the DNS RFC) then tough titty, they get cloaked as an IP. + * Their ISP shouldnt go to town on subdomains, or they shouldnt have a kiddie + * vhost. + */ +#ifdef IPV6 + in6_addr testaddr; + in_addr testaddr2; + if ((dest->GetProtocolFamily() == AF_INET6) && (inet_pton(AF_INET6,dest->host,&testaddr) < 1) && (hostcloak.length() <= 64)) + /* Invalid ipv6 address, and ipv6 user (resolved host) */ + b = hostcloak; + else if ((dest->GetProtocolFamily() == AF_INET) && (inet_aton(dest->host,&testaddr2) < 1) && (hostcloak.length() <= 64)) + /* Invalid ipv4 address, and ipv4 user (resolved host) */ + b = hostcloak; + else + /* Valid ipv6 or ipv4 address (not resolved) ipv4 or ipv6 user */ + b = ((!strchr(dest->host,':')) ? Cloak4(dest->host) : Cloak6(dest->host)); +#else + in_addr testaddr; + if ((inet_aton(dest->host,&testaddr) < 1) && (hostcloak.length() <= 64)) + /* Invalid ipv4 address, and ipv4 user (resolved host) */ + b = hostcloak; + else + /* Valid ipv4 address (not resolved) ipv4 user */ + b = Cloak4(dest->host); +#endif + + dest->ChangeDisplayedHost(b.c_str()); } + + dest->SetMode('x',true); + return MODEACTION_ALLOW; } - else - { - // user is removing the mode, so just restore their real host - // and make it match the displayed one. - Srv->ChangeHost(user,user->host); - } - // this mode IS ours, and we have handled it. If we chose not to handle it, - // for example the user cannot cloak as they have a vhost or such, then - // we could return 0 here instead of 1 and the core would not send the mode - // change to the user. - return 1; } else + { + if (dest->IsModeSet('x')) + { + /* User is removing the mode, so just restore their real host + * and make it match the displayed one. + */ + dest->ChangeDisplayedHost(dest->host); + dest->SetMode('x',false); + return MODEACTION_ALLOW; + } + } + + return MODEACTION_DENY; + } + + std::string Cloak4(const char* ip) + { + unsigned int iv[] = { key1, key2, key3, key4 }; + irc::sepstream seps(ip, '.'); + std::string ra[4];; + std::string octet[4]; + int i[4]; + + for (int j = 0; j < 4; j++) + { + octet[j] = seps.GetToken(); + i[j] = atoi(octet[j].c_str()); + } + + octet[3] = octet[0] + "." + octet[1] + "." + octet[2] + "." + octet[3]; + octet[2] = octet[0] + "." + octet[1] + "." + octet[2]; + octet[1] = octet[0] + "." + octet[1]; + + /* Reset the Hash module and send it our IV */ + HashResetRequest(Sender, HashProvider).Send(); + HashKeyRequest(Sender, HashProvider, iv).Send(); + + /* Send the Hash module a different hex table for each octet group's Hash sum */ + for (int k = 0; k < 4; k++) + { + HashHexRequest(Sender, HashProvider, xtab[(iv[k]+i[k]) % 4]).Send(); + ra[k] = std::string(HashSumRequest(Sender, HashProvider, octet[k]).Send()).substr(0,6); + } + /* Stick them all together */ + return std::string().append(ra[0]).append(".").append(ra[1]).append(".").append(ra[2]).append(".").append(ra[3]); + } + + std::string Cloak6(const char* ip) + { + /* Theyre using 4in6 (YUCK). Translate as ipv4 cloak */ + if (!strncmp(ip, "0::ffff:", 8)) + return Cloak4(ip + 8); + + /* If we get here, yes it really is an ipv6 ip */ + unsigned int iv[] = { key1, key2, key3, key4 }; + std::vector hashies; + std::string item = ""; + int rounds = 0; + + /* Reset the Hash module and send it our IV */ + HashResetRequest(Sender, HashProvider).Send(); + HashKeyRequest(Sender, HashProvider, iv).Send(); + + for (const char* input = ip; *input; input++) { - // this mode isn't ours, we have to bail and return 0 to not handle it. - return 0; + item += *input; + if (item.length() > 5) + { + /* Send the Hash module a different hex table for each octet group's Hash sum */ + HashHexRequest(Sender, HashProvider, xtab[(key1+rounds) % 4]).Send(); + hashies.push_back(std::string(HashSumRequest(Sender, HashProvider, item).Send()).substr(0,10)); + item = ""; + } + rounds++; } + if (!item.empty()) + { + /* Send the Hash module a different hex table for each octet group's Hash sum */ + HashHexRequest(Sender, HashProvider, xtab[(key1+rounds) % 4]).Send(); + hashies.push_back(std::string(HashSumRequest(Sender, HashProvider, item).Send()).substr(0,10)); + item = ""; + } + /* Stick them all together */ + return irc::stringjoiner(":", hashies, 0, hashies.size() - 1).GetJoined(); + } + + void DoRehash() + { + ConfigReader Conf(ServerInstance); + key1 = key2 = key3 = key4 = 0; + key1 = Conf.ReadInteger("cloak","key1",0,true); + key2 = Conf.ReadInteger("cloak","key2",0,true); + key3 = Conf.ReadInteger("cloak","key3",0,true); + key4 = Conf.ReadInteger("cloak","key4",0,true); + prefix = Conf.ReadValue("cloak","prefix",0); + + if (prefix.empty()) + prefix = ServerInstance->Config->Network; + + if (!key1 && !key2 && !key3 && !key4) + throw ModuleException("You have not defined cloak keys for m_cloaking!!! THIS IS INSECURE AND SHOULD BE CHECKED!"); + } +}; + + +class ModuleCloaking : public Module +{ + private: + + CloakUser* cu; + Module* HashModule; + + public: + ModuleCloaking(InspIRCd* Me) + : Module::Module(Me) + { + ServerInstance->UseInterface("HashRequest"); + + /* Attempt to locate the md5 service provider, bail if we can't find it */ + HashModule = ServerInstance->FindModule("m_md5.so"); + if (!HashModule) + throw ModuleException("Can't find m_md5.so. Please load m_md5.so before m_cloaking.so."); + + /* Create new mode handler object */ + cu = new CloakUser(ServerInstance, this, HashModule); + + /* Register it with the core */ + if (!ServerInstance->AddMode(cu, 'x')) + throw ModuleException("Could not add new modes!"); + + OnRehash(NULL,""); + } + + virtual ~ModuleCloaking() + { + ServerInstance->Modes->DelMode(cu); + DELETE(cu); + ServerInstance->DoneWithInterface("HashRequest"); + } + + virtual Version GetVersion() + { + // returns the version number of the module to be + // listed in /MODULES + return Version(1,1,0,2,VF_COMMON|VF_VENDOR,API_VERSION); } - virtual void OnUserConnect(userrec* user) + virtual void OnRehash(userrec* user, const std::string ¶meter) { - // Heres the weird bit. When a user connects we must set +x on them, so - // we're going to use the SendMode method of the Server class to send - // the mode to the client. This is basically the same as sending an - // SAMODE in unreal. Note that to the user it will appear as if they set - // the mode on themselves. - - char* modes[2]; // only two parameters - modes[0] = user->nick; // first parameter is the nick - modes[1] = "+x"; // second parameter is the mode - Srv->SendMode(modes,2,user); // send these, forming the command "MODE +x" + cu->DoRehash(); } + void Implements(char* List) + { + List[I_OnRehash] = 1; + } }; // stuff down here is the module-factory stuff. For basic modules you can ignore this. @@ -150,9 +329,9 @@ class ModuleCloakingFactory : public ModuleFactory { } - virtual Module * CreateModule() + virtual Module * CreateModule(InspIRCd* Me) { - return new ModuleCloaking; + return new ModuleCloaking(Me); } }; @@ -162,4 +341,3 @@ extern "C" void * init_module( void ) { return new ModuleCloakingFactory; } -