X-Git-Url: https://git.netwichtig.de/gitweb/?a=blobdiff_plain;f=src%2Fmodules%2Fm_cloaking.cpp;h=a236300f18404bf623e7ad73a12b738862dd4530;hb=8cebe2878f3878afce6f643d93668155cb26801d;hp=f26e16e0e2edb7cb25a204ef0cba60f88d08c138;hpb=40e990ed06126c1ba6164738527127d1f58fc032;p=user%2Fhenk%2Fcode%2Finspircd.git diff --git a/src/modules/m_cloaking.cpp b/src/modules/m_cloaking.cpp index f26e16e0e..a236300f1 100644 --- a/src/modules/m_cloaking.cpp +++ b/src/modules/m_cloaking.cpp @@ -2,302 +2,85 @@ * | 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. * * --------------------------------------------------- */ -// 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 -#include -#include -#include -#include "inspircd_config.h" -#ifdef HAS_STDINT -#include -#endif -#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 */ - - -/* The four core functions - F1 is optimized somewhat */ - -#define F1(x, y, z) (z ^ (x & (y ^ z))) -#define F2(x, y, z) F1(z, x, y) -#define F3(x, y, z) (x ^ y ^ z) -#define F4(x, y, z) (y ^ (x | ~z)) -#define MD5STEP(f,w,x,y,z,in,s) (w += f(x,y,z) + in, w = (w<>(32-s)) + x) - -#ifndef HAS_STDINT -typedef unsigned int uint32_t; -#endif - -typedef uint32_t word32; /* NOT unsigned long. We don't support 16 bit platforms, anyway. */ -typedef unsigned char byte; - -class xMD5Context : public classbase -{ - public: - word32 buf[4]; - word32 bytes[2]; - word32 in[16]; -}; - +/** Handles user mode +x + */ class CloakUser : public ModeHandler { - + public: std::string prefix; - word32 key1; - word32 key2; - word32 key3; - word32 key4; - - void byteSwap(word32 *buf, unsigned words) + unsigned int key1; + unsigned int key2; + unsigned int key3; + unsigned int key4; + bool ipalways; + Module* Sender; + Module* HashProvider; + const char *xtab[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) { - byte *p = (byte *)buf; - - do - { - *buf++ = (word32)((unsigned)p[3] << 8 | p[2]) << 16 | - ((unsigned)p[1] << 8 | p[0]); - p += 4; - } while (--words); - } - - void xMD5Init(struct xMD5Context *ctx) - { - ctx->buf[0] = key1; - ctx->buf[1] = key2; - ctx->buf[2] = key3; - ctx->buf[3] = key4; - - ctx->bytes[0] = 0; - ctx->bytes[1] = 0; - } + int dots = 0; + std::string::size_type splitdot = host.length(); - void xMD5Update(struct xMD5Context *ctx, byte const *buf, int len) - { - word32 t; - - /* Update byte count */ - - t = ctx->bytes[0]; - if ((ctx->bytes[0] = t + len) < t) - ctx->bytes[1]++; /* Carry from low to high */ - - t = 64 - (t & 0x3f); /* Space available in ctx->in (at least 1) */ - if ((unsigned)t > (unsigned)len) + for (std::string::size_type x = host.length() - 1; x; --x) { - memcpy((byte *)ctx->in + 64 - (unsigned)t, buf, len); - return; - } - /* First chunk is an odd size */ - memcpy((byte *)ctx->in + 64 - (unsigned)t, buf, (unsigned)t); - byteSwap(ctx->in, 16); - xMD5Transform(ctx->buf, ctx->in); - buf += (unsigned)t; - len -= (unsigned)t; - - /* Process data in 64-byte chunks */ - while (len >= 64) - { - memcpy(ctx->in, buf, 64); - byteSwap(ctx->in, 16); - xMD5Transform(ctx->buf, ctx->in); - buf += 64; - len -= 64; - } - - /* Handle any remaining bytes of data. */ - memcpy(ctx->in, buf, len); - } - - void xMD5Final(byte digest[16], struct xMD5Context *ctx) - { - int count = (int)(ctx->bytes[0] & 0x3f); /* Bytes in ctx->in */ - byte *p = (byte *)ctx->in + count; /* First unused byte */ - - /* Set the first char of padding to 0x80. There is always room. */ - *p++ = 0x80; - - /* Bytes of padding needed to make 56 bytes (-8..55) */ - count = 56 - 1 - count; - - if (count < 0) - { /* Padding forces an extra block */ - memset(p, 0, count+8); - byteSwap(ctx->in, 16); - xMD5Transform(ctx->buf, ctx->in); - p = (byte *)ctx->in; - count = 56; + if (host[x] == '.') + { + splitdot = x; + dots++; + } + if (dots >= 3) + break; } - memset(p, 0, count+8); - byteSwap(ctx->in, 14); - - /* Append length in bits and transform */ - ctx->in[14] = ctx->bytes[0] << 3; - ctx->in[15] = ctx->bytes[1] << 3 | ctx->bytes[0] >> 29; - xMD5Transform(ctx->buf, ctx->in); - - byteSwap(ctx->buf, 4); - memcpy(digest, ctx->buf, 16); - memset(ctx, 0, sizeof(ctx)); - } - - void xMD5Transform(word32 buf[4], word32 const in[16]) - { - register word32 a, b, c, d; - - a = buf[0]; - b = buf[1]; - c = buf[2]; - d = buf[3]; - - MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7); - MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12); - MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17); - MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22); - MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7); - MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12); - MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17); - MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22); - MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7); - MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12); - MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17); - MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22); - MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7); - MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12); - MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17); - MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22); - - MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5); - MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9); - MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14); - MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20); - MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5); - MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9); - MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14); - MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20); - MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5); - MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9); - MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14); - MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20); - MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5); - MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9); - MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14); - MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20); - - MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4); - MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11); - MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16); - MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23); - MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4); - MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11); - MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16); - MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23); - MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4); - MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11); - MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16); - MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23); - MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4); - MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11); - MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16); - MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23); - - MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6); - MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10); - MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15); - MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21); - MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6); - MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10); - MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15); - MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21); - MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6); - MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10); - MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15); - MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21); - MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6); - MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10); - MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15); - MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21); - - buf[0] += a; - buf[1] += b; - buf[2] += c; - buf[3] += d; - } - - void MyMD5(void *dest, void *orig, int len) - { - struct xMD5Context context; - - xMD5Init(&context); - xMD5Update(&context, (const unsigned char*)orig, len); - xMD5Final((unsigned char*)dest, &context); + if (splitdot == host.length()) + return host; + else + return host.substr(splitdot); } - - void GenHash(char* src, char* dest) + CloakUser(InspIRCd* Instance, Module* source, Module* Hash) : ModeHandler(Instance, 'x', 0, 0, false, MODETYPE_USER, false), Sender(source), HashProvider(Hash) { - // purposefully lossy md5 - only gives them the most significant 4 bits - // of every md5 output byte. - int i = 0; - unsigned char bytes[16]; - char hash[MAXBUF]; - *hash = 0; - MyMD5((char*)bytes,src,strlen(src)); - for (i = 0; i < 16; i++) - { - const char* xtab = "F92E45D871BCA630"; - unsigned char hi = xtab[bytes[i] / 16]; - char hx[2]; - hx[0] = hi; - hx[1] = '\0'; - strlcat(hash,hx,MAXBUF); - } - strlcpy(dest,hash,MAXBUF); } - - public: - CloakUser(InspIRCd* Instance) : ModeHandler(Instance, 'x', 0, 0, false, MODETYPE_USER, false) { } - 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, bool) { - /* 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. + * 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) { @@ -311,59 +94,30 @@ 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; + + if (!dest->GetExt("cloaked_host", 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. - */ - - char* n = strstr(dest->host,"."); - if (!n) - n = strstr(dest->host,":"); - - std::string a = n; - - char ra[64]; - this->GenHash(dest->host,ra); - std::string b = ""; - insp_inaddr testaddr; - std::string hostcloak = prefix + "-" + std::string(ra) + 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 - { - // else, they have an ip - b = std::string(ra) + "." + prefix + ".cloak"; - } - ServerInstance->Log(DEBUG,"cloak: allocated "+b); - dest->ChangeDisplayedHost(b.c_str()); + /* Force creation of missing cloak */ + Sender->OnUserConnect(dest); + } + if (dest->GetExt("cloaked_host", 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; } @@ -371,25 +125,123 @@ class CloakUser : public ModeHandler 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++) + { + seps.GetToken(octet[j]); + 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) + { + 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++) + { + item += *input; + 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(0,8)); + 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(0,8)); + item.clear(); + } + /* Stick them all together */ + return irc::stringjoiner(":", hashies, 0, hashies.size() - 1).GetJoined(); + } + void DoRehash() { ConfigReader Conf(ServerInstance); + 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,false); - key2 = Conf.ReadInteger("cloak","key2",0,false); - key3 = Conf.ReadInteger("cloak","key3",0,false); - key4 = Conf.ReadInteger("cloak","key4",0,false); - + 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); - if (prefix == "") + ipalways = Conf.ReadFlag("cloak", "ipalways", 0); + lowercase = Conf.ReadFlag("cloak", "lowercase", 0); + + if (!lowercase) { - prefix = ServerInstance->Config->Network; + xtab[0] = "F92E45D871BCA630"; + xtab[1] = "A1B9D80C72E653F4"; + xtab[2] = "1ABC078934DEF562"; + xtab[3] = "ABCDEF5678901234"; } - if (!key1 && !key2 && !key3 && !key4) + else { - ModuleException ex("You have not defined cloak keys for m_cloaking!!! THIS IS INSECURE AND SHOULD BE CHECKED!"); - throw (ex); + xtab[0] = "f92e45d871bca630"; + xtab[1] = "a1b9d80c72e653f4"; + xtab[2] = "1abc078934def562"; + xtab[3] = "abcdef5678901234"; + } + + if (prefix.empty()) + prefix = ServerInstance->Config->Network; + + if (!key1 || !key2 || !key3 || !key4) + { + 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); } } }; @@ -398,83 +250,186 @@ class CloakUser : public ModeHandler class ModuleCloaking : public Module { private: - CloakUser* cu; public: ModuleCloaking(InspIRCd* Me) - : Module::Module(Me) + : Module(Me) { - /* Create new mode handler object */ - cu = new CloakUser(ServerInstance); + /* 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."); + + cu = new CloakUser(ServerInstance, this, HashModule); - /* Register it with the core */ - ServerInstance->AddMode(cu, 'x'); + try + { + OnRehash(NULL); + } + catch (ModuleException &e) + { + delete cu; + throw e; + } - OnRehash(""); + /* Register it with the core */ + if (!ServerInstance->Modes->AddMode(cu)) + { + delete cu; + throw ModuleException("Could not add new modes!"); + } + + ServerInstance->Modules->UseInterface("HashRequest"); + + Implementation eventlist[] = { I_OnRehash, I_OnUserDisconnect, I_OnCleanup, I_OnCheckBan, I_OnUserConnect, I_OnSyncUserMetaData, I_OnCleanup }; + ServerInstance->Modules->Attach(eventlist, this, 6); + + CloakExistingUsers(); } - - virtual ~ModuleCloaking() + + void OnSyncUserMetaData(User* user, Module* proto,void* opaque, const std::string &extname, bool displayable) { - ServerInstance->Modes->DelMode(cu); - DELETE(cu); + if ((displayable) && (extname == "cloaked_host")) + { + std::string* cloak; + if (user->GetExt("cloaked_host", cloak)) + proto->ProtoSendMetaData(opaque, TYPE_USER, user, extname, *cloak); + } } - - virtual Version GetVersion() + + void CloakExistingUsers() { - // returns the version number of the module to be - // listed in /MODULES - return Version(1,0,0,2,VF_COMMON|VF_VENDOR); + std::string* cloak; + for (std::vector::iterator u = ServerInstance->Users->local_users.begin(); u != ServerInstance->Users->local_users.end(); u++) + { + if (!(*u)->GetExt("cloaked_host", cloak)) + { + OnUserConnect(*u); + } + } } - virtual void OnRehash(const std::string ¶meter) + virtual int OnCheckBan(User* user, Channel* chan) { - cu->DoRehash(); + char mask[MAXBUF]; + std::string* tofree; + /* Check if they have a cloaked host, but are not using it */ + if (user->GetExt("cloaked_host", tofree) && *tofree != user->dhost) + { + snprintf(mask, MAXBUF, "%s!%s@%s", user->nick.c_str(), user->ident.c_str(), tofree->c_str()); + for (BanList::iterator i = chan->bans.begin(); i != chan->bans.end(); i++) + { + if (InspIRCd::Match(mask,i->data)) + return -1; + } + } + return 0; } - void Implements(char* List) + void Prioritize() { - List[I_OnRehash] = List[I_OnUserConnect] = 1; + /* 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); } - virtual void OnUserConnect(userrec* user) + virtual void OnUserDisconnect(User* user) { - // 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. - - const char* modes[2]; // only two parameters - modes[0] = user->nick; // first parameter is the nick - modes[1] = "+x"; // second parameter is the mode - ServerInstance->SendMode(modes,2,user); // send these, forming the command "MODE +x" + std::string* tofree; + if (user->GetExt("cloaked_host", tofree)) + { + delete tofree; + user->Shrink("cloaked_host"); + } } -}; + virtual void OnCleanup(int target_type, void* item) + { + if (target_type == TYPE_USER) + OnUserDisconnect((User*)item); + } -// stuff down here is the module-factory stuff. For basic modules you can ignore this. + virtual ~ModuleCloaking() + { + ServerInstance->Modes->DelMode(cu); + delete cu; + ServerInstance->Modules->DoneWithInterface("HashRequest"); + } -class ModuleCloakingFactory : public ModuleFactory -{ - public: - ModuleCloakingFactory() + virtual Version GetVersion() { + // returns the version number of the module to be + // listed in /MODULES + return Version("$Id$", VF_COMMON|VF_VENDOR,API_VERSION); } - - ~ModuleCloakingFactory() + + virtual void OnRehash(User* user) { + cu->DoRehash(); } - - virtual Module * CreateModule(InspIRCd* Me) + + virtual void OnUserConnect(User* dest) { - return new ModuleCloaking(Me); + std::string* tofree; + if (dest->GetExt("cloaked_host", tofree)) + 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()); + } + + dest->Extend("cloaked_host", new std::string(b)); + } } - -}; +}; -extern "C" void * init_module( void ) -{ - return new ModuleCloakingFactory; -} +MODULE_INIT(ModuleCloaking)