X-Git-Url: https://git.netwichtig.de/gitweb/?a=blobdiff_plain;f=src%2Fmodules%2Fm_cloaking.cpp;h=2bd8df80eea37f9dc6b3126e44c85cd0ba8e0b31;hb=de25d946733f774e3a5b53a58438a9c92af0acbe;hp=ef1bb01a906824e281a5181b1177400fcd3e34fd;hpb=e4b4242407fb4b46985e2909969b0549ee4f23e2;p=user%2Fhenk%2Fcode%2Finspircd.git diff --git a/src/modules/m_cloaking.cpp b/src/modules/m_cloaking.cpp index ef1bb01a9..2bd8df80e 100644 --- a/src/modules/m_cloaking.cpp +++ b/src/modules/m_cloaking.cpp @@ -2,62 +2,87 @@ * | Inspire Internet Relay Chat Daemon | * +------------------------------------+ * - * InspIRCd is copyright (C) 2002-2006 ChatSpike-Dev. - * E-mail: - * - * - * - * Written by Craig Edwards, Craig McLure, and others. + * InspIRCd: (C) 2002-2009 InspIRCd Development Team + * See: http://wiki.inspircd.org/Credits + * * This program is free but copyrighted software; see - * the file COPYING for details. + * 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 */ -/* 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 { - + public: std::string prefix; unsigned int key1; unsigned int key2; unsigned int key3; unsigned int key4; - Module* Sender; + bool ipalways; Module* HashProvider; - - public: - CloakUser(InspIRCd* Instance, Module* Source, Module* Hash) : ModeHandler(Instance, 'x', 0, 0, false, MODETYPE_USER, false), Sender(Source), HashProvider(Hash) + const char *xtab[4]; + LocalStringExt ext; + + /** 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) { + int dots = 0; + std::string::size_type splitdot = host.length(); + + for (std::string::size_type x = host.length() - 1; x; --x) + { + if (host[x] == '.') + { + splitdot = x; + dots++; + } + if (dots >= 3) + break; + } + + if (splitdot == host.length()) + return host; + else + return host.substr(splitdot); } - ModeAction OnModeChange(userrec* source, userrec* dest, chanrec* channel, std::string ¶meter, bool adding) + CloakUser(Module* source, Module* Hash) + : ModeHandler(source, 'x', PARAM_NONE, MODETYPE_USER), HashProvider(Hash), + ext("cloaked_host", source) { - /* Only opers can change other users modes */ - if ((source != dest) && (!*source->oper)) - return MODEACTION_DENY; + } + ModeAction OnModeChange(User* source, User* dest, Channel* channel, std::string ¶meter, bool adding) + { /* For remote clients, we dont take any action, we just allow it. * The local server where they are will set their cloak instead. + * This is fine, as we will recieve it later. */ if (!IS_LOCAL(dest)) + { + dest->SetMode('x',adding); return MODEACTION_ALLOW; + } + + /* don't allow this user to spam modechanges */ + dest->IncreasePenalty(5); if (adding) { @@ -71,63 +96,31 @@ class CloakUser : public ModeHandler * naming in their hostname (e.g. if they are on a lan or * are connecting via localhost) -- this doesnt matter much. */ - - if (strchr(dest->host,'.') || strchr(dest->host,':')) + + std::string* cloak = ext.get(dest); + + if (!cloak) { - /* 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 }; - char* n = strstr(dest->host,"."); - if (!n) - n = strstr(dest->host,":"); - - std::string a = n; - - std::string b; - insp_inaddr testaddr; - - /** 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[0]); - - /* Generate a cloak using specialized Hash */ - std::string hostcloak = prefix + "-" + HashSumRequest(Sender, HashProvider, dest->host).Send() + 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. - */ - - if ((insp_aton(dest->host,&testaddr) < 1) && (hostcloak.length() <= 64)) - { - // if they have a hostname, make something appropriate - b = hostcloak; - } - else - { - b = ((b.find(':') == std::string::npos) ? Cloak4(dest->host) : Cloak6(dest->host)); - } - dest->ChangeDisplayedHost(b.c_str()); + /* Force creation of missing cloak */ + creator->OnUserConnect(dest); + cloak = ext.get(dest); + } + if (cloak) + { + dest->ChangeDisplayedHost(cloak->c_str()); + dest->SetMode('x',true); + return MODEACTION_ALLOW; } - - dest->SetMode('x',true); - return MODEACTION_ALLOW; } } else - { + { if (dest->IsModeSet('x')) { - /* User is removing the mode, so just restore their real host - * and make it match the displayed one. + /* User is removing the mode, so just restore their real host + * and make it match the displayed one. */ - dest->ChangeDisplayedHost(dest->host); + dest->ChangeDisplayedHost(dest->host.c_str()); dest->SetMode('x',false); return MODEACTION_ALLOW; } @@ -146,7 +139,7 @@ class CloakUser : public ModeHandler for (int j = 0; j < 4; j++) { - octet[j] = seps.GetToken(); + seps.GetToken(octet[j]); i[j] = atoi(octet[j].c_str()); } @@ -155,14 +148,14 @@ class CloakUser : public ModeHandler octet[1] = octet[0] + "." + octet[1]; /* Reset the Hash module and send it our IV */ - HashResetRequest(Sender, HashProvider).Send(); - HashKeyRequest(Sender, HashProvider, iv).Send(); + HashResetRequest(creator, HashProvider).Send(); + HashKeyRequest(creator, HashProvider, iv).Send(); /* Send the Hash module a different hex table for each octet group's Hash sum */ - for (int k = 0; k < 3; k++) + 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); + HashHexRequest(creator, HashProvider, xtab[(iv[k]+i[k]) % 4]).Send(); + ra[k] = std::string(HashSumRequest(creator, 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]); @@ -172,53 +165,86 @@ class CloakUser : public ModeHandler { unsigned int iv[] = { key1, key2, key3, key4 }; std::vector hashies; - std::string item = ""; + std::string item; int rounds = 0; /* Reset the Hash module and send it our IV */ - HashResetRequest(Sender, HashProvider).Send(); - HashKeyRequest(Sender, HashProvider, iv).Send(); + HashResetRequest(creator, HashProvider).Send(); + HashKeyRequest(creator, HashProvider, iv).Send(); for (const char* input = ip; *input; input++) { item += *input; - if (item.length() > 5) + if (item.length() > 7) { /* 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 = ""; + HashHexRequest(creator, HashProvider, xtab[(key1+rounds) % 4]).Send(); + hashies.push_back(std::string(HashSumRequest(creator, HashProvider, item).Send()).substr(0,8)); + item.clear(); } 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 = ""; + HashHexRequest(creator, HashProvider, xtab[(key1+rounds) % 4]).Send(); + hashies.push_back(std::string(HashSumRequest(creator, HashProvider, item).Send()).substr(0,8)); + item.clear(); } /* Stick them all together */ return irc::stringjoiner(":", hashies, 0, hashies.size() - 1).GetJoined(); } - + void DoRehash() { - ConfigReader Conf(ServerInstance); + ConfigReader Conf; + bool lowercase; + + /* These are *not* using the need_positive parameter of ReadInteger - + * that will limit the valid values to only the positive values in a + * signed int. Instead, accept any value that fits into an int and + * cast it to an unsigned int. That will, a bit oddly, give us the full + * spectrum of an unsigned integer. - Special */ 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); + key1 = (unsigned int) Conf.ReadInteger("cloak","key1",0,false); + key2 = (unsigned int) Conf.ReadInteger("cloak","key2",0,false); + key3 = (unsigned int) Conf.ReadInteger("cloak","key3",0,false); + key4 = (unsigned int) Conf.ReadInteger("cloak","key4",0,false); prefix = Conf.ReadValue("cloak","prefix",0); + ipalways = Conf.ReadFlag("cloak", "ipalways", 0); + lowercase = Conf.ReadFlag("cloak", "lowercase", 0); + + if (!lowercase) + { + xtab[0] = "F92E45D871BCA630"; + xtab[1] = "A1B9D80C72E653F4"; + xtab[2] = "1ABC078934DEF562"; + xtab[3] = "ABCDEF5678901234"; + } + else + { + xtab[0] = "f92e45d871bca630"; + xtab[1] = "a1b9d80c72e653f4"; + xtab[2] = "1abc078934def562"; + xtab[3] = "abcdef5678901234"; + } if (prefix.empty()) prefix = ServerInstance->Config->Network; - if (!key1 && !key2 && !key3 && !key4) + if (!key1 || !key2 || !key3 || !key4) { - ModuleException ex("You have not defined cloak keys for m_cloaking!!! THIS IS INSECURE AND SHOULD BE CHECKED!"); - throw (ex); + std::string detail; + if (!key1) + detail = " is not valid, it may be set to a too high/low value, or it may not exist."; + else if (!key2) + detail = " is not valid, it may be set to a too high/low value, or it may not exist."; + else if (!key3) + detail = " is not valid, it may be set to a too high/low value, or it may not exist."; + else if (!key4) + detail = " is not valid, it may be set to a too high/low value, or it may not exist."; + + throw ModuleException("You have not defined cloak keys for m_cloaking!!! THIS IS INSECURE AND SHOULD BE CHECKED! - " + detail); } } }; @@ -227,74 +253,158 @@ class CloakUser : public ModeHandler class ModuleCloaking : public Module { private: - CloakUser* cu; - Module* HashModule; public: - ModuleCloaking(InspIRCd* Me) - : Module::Module(Me) + ModuleCloaking() { - /* Attempt to locate the Hash service provider, bail if we can't find it */ - HashModule = ServerInstance->FindModule("m_md5.so"); + /* Attempt to locate the md5 service provider, bail if we can't find it */ + Module* HashModule = ServerInstance->Modules->Find("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); + cu = new CloakUser(this, HashModule); + + try + { + OnRehash(NULL); + } + catch (ModuleException &e) + { + delete cu; + throw e; + } + + /* Register it with the core */ + if (!ServerInstance->Modes->AddMode(cu)) + { + delete cu; + throw ModuleException("Could not add new modes!"); + } + + ServerInstance->Modules->UseInterface("HashRequest"); + Extensible::Register(&cu->ext); - /* Register it with the core */ - ServerInstance->AddMode(cu, 'x'); + Implementation eventlist[] = { I_OnRehash, I_OnCheckBan, I_OnUserConnect }; + ServerInstance->Modules->Attach(eventlist, this, 3); - OnRehash(""); + CloakExistingUsers(); } - - virtual ~ModuleCloaking() + + void CloakExistingUsers() { - ServerInstance->Modes->DelMode(cu); - DELETE(cu); + std::string* cloak; + for (std::vector::iterator u = ServerInstance->Users->local_users.begin(); u != ServerInstance->Users->local_users.end(); u++) + { + cloak = cu->ext.get(*u); + if (!cloak) + { + OnUserConnect(*u); + } + } } - - virtual Version GetVersion() + + ModResult OnCheckBan(User* user, Channel* chan, const std::string& mask) { - // returns the version number of the module to be - // listed in /MODULES - return Version(1,1,0,2,VF_COMMON|VF_VENDOR,API_VERSION); + char cmask[MAXBUF]; + std::string* cloak = cu->ext.get(user); + /* Check if they have a cloaked host, but are not using it */ + if (cloak && *cloak != user->dhost) + { + snprintf(cmask, MAXBUF, "%s!%s@%s", user->nick.c_str(), user->ident.c_str(), cloak->c_str()); + if (InspIRCd::Match(cmask,mask)) + return MOD_RES_DENY; + } + return MOD_RES_PASSTHRU; } - virtual void OnRehash(const std::string ¶meter) + void Prioritize() { - cu->DoRehash(); + /* Needs to be after m_banexception etc. */ + ServerInstance->Modules->SetPriority(this, I_OnCheckBan, PRIORITY_LAST); + + /* but before m_conn_umodes, so host is generated ready to apply */ + Module *um = ServerInstance->Modules->Find("m_conn_umodes.so"); + ServerInstance->Modules->SetPriority(this, I_OnUserConnect, PRIORITY_AFTER, &um); } - void Implements(char* List) + ~ModuleCloaking() { - List[I_OnRehash] = 1; + ServerInstance->Modes->DelMode(cu); + delete cu; + ServerInstance->Modules->DoneWithInterface("HashRequest"); } -}; -// stuff down here is the module-factory stuff. For basic modules you can ignore this. - -class ModuleCloakingFactory : public ModuleFactory -{ - public: - ModuleCloakingFactory() + Version GetVersion() { + // returns the version number of the module to be + // listed in /MODULES + return Version("Provides masking of user hostnames", VF_COMMON|VF_VENDOR,API_VERSION); } - - ~ModuleCloakingFactory() + + void OnRehash(User* user) { + cu->DoRehash(); } - - virtual Module * CreateModule(InspIRCd* Me) + + void OnUserConnect(User* dest) { - return new ModuleCloaking(Me); + std::string* cloak = cu->ext.get(dest); + if (cloak) + return; + + if (dest->host.find('.') != std::string::npos || dest->host.find(':') != std::string::npos) + { + unsigned int iv[] = { cu->key1, cu->key2, cu->key3, cu->key4 }; + std::string a = cu->LastTwoDomainParts(dest->host); + std::string 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. + */ + + /* 2008/08/18: add which always cloaks + * the IP, for anonymity. --nenolod + */ + if (!cu->ipalways) + { + /** Reset the Hash module, and send it our IV and hex table */ + HashResetRequest(this, cu->HashProvider).Send(); + HashKeyRequest(this, cu->HashProvider, iv).Send(); + HashHexRequest(this, cu->HashProvider, cu->xtab[(dest->host[0]) % 4]); + + /* Generate a cloak using specialized Hash */ + std::string hostcloak = cu->prefix + "-" + std::string(HashSumRequest(this, cu->HashProvider, dest->host.c_str()).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. + */ + std::string testaddr; + int testport; + if (!irc::sockets::satoap(&dest->client_sa, testaddr, testport) && (hostcloak.length() <= 64)) + /* not a valid address, must have been a host, so cloak as a host */ + b = hostcloak; + else if (dest->client_sa.sa.sa_family == AF_INET6) + b = cu->Cloak6(dest->GetIPString()); + else + b = cu->Cloak4(dest->GetIPString()); + } + else + { + if (dest->client_sa.sa.sa_family == AF_INET6) + b = cu->Cloak6(dest->GetIPString()); + else + b = cu->Cloak4(dest->GetIPString()); + } + + cu->ext.set(dest,b); + } } - -}; +}; -extern "C" void * init_module( void ) -{ - return new ModuleCloakingFactory; -} +MODULE_INIT(ModuleCloaking)