X-Git-Url: https://git.netwichtig.de/gitweb/?a=blobdiff_plain;f=src%2Fmodules%2Fm_cloaking.cpp;h=31f9eea5d9cc7fdc1d0cc38a8b22a098f6d5abfa;hb=bdfde49fb6d9a8787c072b759d4af27584308e1b;hp=a32f7348d27215cf12b61d4633d5890bdc1086e0;hpb=540fee57bf71abccaba38c0297b80f8001780c1d;p=user%2Fhenk%2Fcode%2Finspircd.git diff --git a/src/modules/m_cloaking.cpp b/src/modules/m_cloaking.cpp index a32f7348d..890c799f2 100644 --- a/src/modules/m_cloaking.cpp +++ b/src/modules/m_cloaking.cpp @@ -1,298 +1,389 @@ -/* +------------------------------------+ - * | Inspire Internet Relay Chat Daemon | - * +------------------------------------+ +/* + * InspIRCd -- Internet Relay Chat Daemon * - * InspIRCd is copyright (C) 2002-2006 ChatSpike-Dev. - * E-mail: - * - * - * - * Written by Craig Edwards, Craig McLure, and others. - * This program is free but copyrighted software; see - * the file COPYING for details. + * Copyright (C) 2009-2010 Daniel De Graaf + * Copyright (C) 2006-2008 Robin Burchell + * Copyright (C) 2008 Pippijn van Steenhoven + * Copyright (C) 2003-2008 Craig Edwards + * Copyright (C) 2007 John Brooks + * Copyright (C) 2007 Dennis Friis + * Copyright (C) 2006 Oliver Lupton * - * --------------------------------------------------- + * This file is part of InspIRCd. InspIRCd is free software: you can + * redistribute it and/or modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation, version 2. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS + * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more + * details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see . */ -#include "inspircd_config.h" -#include "configreader.h" -#include "inspircd.h" -#include "users.h" -#include "channels.h" -#include "modules.h" -#include "m_hash.h" +#include "inspircd.h" +#include "modules/hash.h" -/* $ModDesc: Provides masking of user hostnames */ -/* $ModDep: m_hash.h */ +enum CloakMode +{ + /** 2.0 cloak of "half" of the hostname plus the full IP hash */ + MODE_HALF_CLOAK, + /** 2.0 cloak of IP hash, split at 2 common CIDR range points */ + MODE_OPAQUE +}; -/* Used to vary the output a little more depending on the cloak keys */ -static const char* xtab[] = {"F92E45D871BCA630", "A1B9D80C72E653F4", "1ABC078934DEF562", "ABCDEF5678901234"}; +// lowercase-only encoding similar to base64, used for hash output +static const char base32[] = "0123456789abcdefghijklmnopqrstuv"; /** Handles user mode +x */ class CloakUser : public ModeHandler { - - std::string prefix; - unsigned int key1; - unsigned int key2; - unsigned int key3; - unsigned int key4; - Module* Sender; - Module* HashProvider; - public: - CloakUser(InspIRCd* Instance, Module* Source, Module* Hash) : ModeHandler(Instance, 'x', 0, 0, false, MODETYPE_USER, false), Sender(Source), HashProvider(Hash) + LocalStringExt ext; + std::string debounce_uid; + time_t debounce_ts; + int debounce_count; + + CloakUser(Module* source) + : ModeHandler(source, "cloak", 'x', PARAM_NONE, MODETYPE_USER), + ext("cloaked_host", ExtensionItem::EXT_USER, source), debounce_ts(0), debounce_count(0) { } - ModeAction OnModeChange(userrec* source, userrec* dest, chanrec* channel, std::string ¶meter, bool adding) + ModeAction OnModeChange(User* source, User* dest, Channel* channel, std::string ¶meter, bool adding) { - /* Only opers can change other users modes */ - if ((source != dest) && (!*source->oper)) - return MODEACTION_DENY; + LocalUser* user = IS_LOCAL(dest); - /* For remote clients, we dont take any action, we just allow it. + /* For remote clients, we don't take any action, we just allow it. * The local server where they are will set their cloak instead. + * This is fine, as we will receive it later. */ - if (!IS_LOCAL(dest)) + if (!user) + { + dest->SetMode(this, adding); return MODEACTION_ALLOW; + } + + if (user->uuid == debounce_uid && debounce_ts == ServerInstance->Time()) + { + // prevent spamming using /mode user +x-x+x-x+x-x + if (++debounce_count > 2) + return MODEACTION_DENY; + } + else + { + debounce_uid = user->uuid; + debounce_count = 1; + debounce_ts = ServerInstance->Time(); + } + + if (adding == user->IsModeSet(this)) + return MODEACTION_DENY; + + /* don't allow this user to spam modechanges */ + if (source == dest) + user->CommandFloodPenalty += 5000; if (adding) { - if(!dest->IsModeSet('x')) + std::string* cloak = ext.get(user); + + if (!cloak) { - /* 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) - { - /* 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 = (n1 ? n1 : n2); - 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[(*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. - */ - - 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()); - } - - dest->SetMode('x',true); - return MODEACTION_ALLOW; + /* Force creation of missing cloak */ + creator->OnUserConnect(user); + cloak = ext.get(user); } - } - else - { - if (dest->IsModeSet('x')) + if (cloak) { - /* 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); + user->ChangeDisplayedHost(*cloak); + user->SetMode(this, true); return MODEACTION_ALLOW; } + else + return MODEACTION_DENY; } + else + { + /* User is removing the mode, so restore their real host + * and make it match the displayed one. + */ + user->SetMode(this, false); + user->ChangeDisplayedHost(user->host.c_str()); + return MODEACTION_ALLOW; + } + } +}; - return MODEACTION_DENY; +class CommandCloak : public Command +{ + public: + CommandCloak(Module* Creator) : Command(Creator, "CLOAK", 1) + { + flags_needed = 'o'; + syntax = ""; } - std::string Cloak4(const char* ip) + CmdResult Handle(const std::vector ¶meters, User *user); +}; + +class ModuleCloaking : public Module +{ + public: + CloakUser cu; + CloakMode mode; + CommandCloak ck; + std::string prefix; + std::string suffix; + std::string key; + const char* xtab[4]; + dynamic_reference Hash; + + ModuleCloaking() : cu(this), mode(MODE_OPAQUE), ck(this), Hash(this, "hash/md5") { - unsigned int iv[] = { key1, key2, key3, key4 }; - irc::sepstream seps(ip, '.'); - std::string ra[4];; - std::string octet[4]; - int i[4]; + } + + /** 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 (int j = 0; j < 4; j++) + for (std::string::size_type x = host.length() - 1; x; --x) { - octet[j] = seps.GetToken(); - i[j] = atoi(octet[j].c_str()); + if (host[x] == '.') + { + splitdot = x; + dots++; + } + if (dots >= 3) + break; } - 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(); + if (splitdot == host.length()) + return ""; + else + return host.substr(splitdot); + } - /* Send the Hash module a different hex table for each octet group's Hash sum */ - for (int k = 0; k < 4; k++) + /** + * 2.0-style cloaking function + * @param item The item to cloak (part of an IP or hostname) + * @param id A unique ID for this type of item (to make it unique if the item matches) + * @param len The length of the output. Maximum for MD5 is 16 characters. + */ + std::string SegmentCloak(const std::string& item, char id, int len) + { + std::string input; + input.reserve(key.length() + 3 + item.length()); + input.append(1, id); + input.append(key); + input.append(1, '\0'); // null does not terminate a C++ string + input.append(item); + + std::string rv = Hash->GenerateRaw(input).substr(0,len); + for(int i=0; i < len; i++) { - HashHexRequest(Sender, HashProvider, xtab[(iv[k]+i[k]) % 4]).Send(); - ra[k] = std::string(HashSumRequest(Sender, HashProvider, octet[k]).Send()).substr(0,6); + // this discards 3 bits per byte. We have an + // overabundance of bits in the hash output, doesn't + // matter which ones we are discarding. + rv[i] = base32[rv[i] & 0x1F]; } - /* Stick them all together */ - return std::string().append(ra[0]).append(".").append(ra[1]).append(".").append(ra[2]).append(".").append(ra[3]); + return rv; } - std::string Cloak6(const char* ip) + std::string SegmentIP(const irc::sockets::sockaddrs& ip, bool full) { - unsigned int iv[] = { key1, key2, key3, key4 }; - std::vector hashies; - std::string item = ""; - int rounds = 0; + std::string bindata; + int hop1, hop2, hop3; + int len1, len2; + std::string rv; + if (ip.sa.sa_family == AF_INET6) + { + bindata = std::string((const char*)ip.in6.sin6_addr.s6_addr, 16); + hop1 = 8; + hop2 = 6; + hop3 = 4; + len1 = 6; + len2 = 4; + // pfx s1.s2.s3. (xxxx.xxxx or s4) sfx + // 6 4 4 9/6 + rv.reserve(prefix.length() + 26 + suffix.length()); + } + else + { + bindata = std::string((const char*)&ip.in4.sin_addr, 4); + hop1 = 3; + hop2 = 0; + hop3 = 2; + len1 = len2 = 3; + // pfx s1.s2. (xxx.xxx or s3) sfx + rv.reserve(prefix.length() + 15 + suffix.length()); + } - /* Reset the Hash module and send it our IV */ - HashResetRequest(Sender, HashProvider).Send(); - HashKeyRequest(Sender, HashProvider, iv).Send(); + rv.append(prefix); + rv.append(SegmentCloak(bindata, 10, len1)); + rv.append(1, '.'); + bindata.erase(hop1); + rv.append(SegmentCloak(bindata, 11, len2)); + if (hop2) + { + rv.append(1, '.'); + bindata.erase(hop2); + rv.append(SegmentCloak(bindata, 12, len2)); + } - for (const char* input = ip; *input; input++) + if (full) + { + rv.append(1, '.'); + bindata.erase(hop3); + rv.append(SegmentCloak(bindata, 13, 6)); + rv.append(suffix); + } + else { - item += *input; - if (item.length() > 5) + if (ip.sa.sa_family == AF_INET6) { - /* 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 = ""; + rv.append(InspIRCd::Format(".%02x%02x.%02x%02x%s", + ip.in6.sin6_addr.s6_addr[2], ip.in6.sin6_addr.s6_addr[3], + ip.in6.sin6_addr.s6_addr[0], ip.in6.sin6_addr.s6_addr[1], suffix.c_str())); + } + else + { + const unsigned char* ip4 = (const unsigned char*)&ip.in4.sin_addr; + rv.append(InspIRCd::Format(".%d.%d%s", ip4[1], ip4[0], suffix.c_str())); } - rounds++; } - if (!item.empty()) + return rv; + } + + ModResult OnCheckBan(User* user, Channel* chan, const std::string& mask) CXX11_OVERRIDE + { + LocalUser* lu = IS_LOCAL(user); + if (!lu) + return MOD_RES_PASSTHRU; + + OnUserConnect(lu); + std::string* cloak = cu.ext.get(user); + /* Check if they have a cloaked host, but are not using it */ + if (cloak && *cloak != user->dhost) { - /* 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 = ""; + const std::string cloakMask = user->nick + "!" + user->ident + "@" + *cloak; + if (InspIRCd::Match(cloakMask, mask)) + return MOD_RES_DENY; } - /* Stick them all together */ - return irc::stringjoiner(":", hashies, 0, hashies.size() - 1).GetJoined(); + return MOD_RES_PASSTHRU; } - - void DoRehash() + + void Prioritize() { - 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!"); + /* Needs to be after m_banexception etc. */ + ServerInstance->Modules->SetPriority(this, I_OnCheckBan, PRIORITY_LAST); } -}; - -class ModuleCloaking : public Module -{ - private: - - CloakUser* cu; - Module* HashModule; - - public: - ModuleCloaking(InspIRCd* Me) - : Module::Module(Me) + // this unsets umode +x on every host change. If we are actually doing a +x + // mode change, we will call SetMode back to true AFTER the host change is done. + void OnChangeHost(User* u, const std::string& host) CXX11_OVERRIDE { - 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 */ - ServerInstance->AddMode(cu, 'x'); - - OnRehash(""); + if (u->IsModeSet(cu)) + { + u->SetMode(cu, false); + u->WriteCommand("MODE", "-" + ConvToStr(cu.GetModeChar())); + } } - - virtual ~ModuleCloaking() + + Version GetVersion() CXX11_OVERRIDE { - ServerInstance->Modes->DelMode(cu); - DELETE(cu); - ServerInstance->DoneWithInterface("HashRequest"); + std::string testcloak = "broken"; + if (Hash) + { + switch (mode) + { + case MODE_HALF_CLOAK: + testcloak = prefix + SegmentCloak("*", 3, 8) + suffix; + break; + case MODE_OPAQUE: + testcloak = prefix + SegmentCloak("*", 4, 8) + suffix; + } + } + return Version("Provides masking of user hostnames", VF_COMMON|VF_VENDOR, testcloak); } - - virtual Version GetVersion() + + void ReadConfig(ConfigStatus& status) CXX11_OVERRIDE { - // returns the version number of the module to be - // listed in /MODULES - return Version(1,1,0,2,VF_COMMON|VF_VENDOR,API_VERSION); + ConfigTag* tag = ServerInstance->Config->ConfValue("cloak"); + prefix = tag->getString("prefix"); + suffix = tag->getString("suffix", ".IP"); + + std::string modestr = tag->getString("mode"); + if (modestr == "half") + mode = MODE_HALF_CLOAK; + else if (modestr == "full") + mode = MODE_OPAQUE; + else + throw ModuleException("Bad value for ; must be half or full"); + + key = tag->getString("key"); + if (key.empty() || key == "secret") + throw ModuleException("You have not defined cloak keys for m_cloaking. Define as a network-wide secret."); } - virtual void OnRehash(const std::string ¶meter) + std::string GenCloak(const irc::sockets::sockaddrs& ip, const std::string& ipstr, const std::string& host) { - cu->DoRehash(); + std::string chost; + + switch (mode) + { + case MODE_HALF_CLOAK: + { + if (ipstr != host) + chost = prefix + SegmentCloak(host, 1, 6) + LastTwoDomainParts(host); + if (chost.empty() || chost.length() > 50) + chost = SegmentIP(ip, false); + break; + } + case MODE_OPAQUE: + default: + chost = SegmentIP(ip, true); + } + return chost; } - void Implements(char* List) + void OnUserConnect(LocalUser* dest) CXX11_OVERRIDE { - List[I_OnRehash] = 1; + std::string* cloak = cu.ext.get(dest); + if (cloak) + return; + + cu.ext.set(dest, GenCloak(dest->client_sa, dest->GetIPString(), dest->host)); } }; -// stuff down here is the module-factory stuff. For basic modules you can ignore this. - -class ModuleCloakingFactory : public ModuleFactory +CmdResult CommandCloak::Handle(const std::vector ¶meters, User *user) { - public: - ModuleCloakingFactory() - { - } - - ~ModuleCloakingFactory() - { - } - - virtual Module * CreateModule(InspIRCd* Me) - { - return new ModuleCloaking(Me); - } - -}; + ModuleCloaking* mod = (ModuleCloaking*)(Module*)creator; + irc::sockets::sockaddrs sa; + std::string cloak; + if (irc::sockets::aptosa(parameters[0], 0, sa)) + cloak = mod->GenCloak(sa, parameters[0], parameters[0]); + else + cloak = mod->GenCloak(sa, "", parameters[0]); -extern "C" void * init_module( void ) -{ - return new ModuleCloakingFactory; + user->WriteNotice("*** Cloak for " + parameters[0] + " is " + cloak); + + return CMD_SUCCESS; } + +MODULE_INIT(ModuleCloaking)