X-Git-Url: https://git.netwichtig.de/gitweb/?a=blobdiff_plain;f=src%2Fmodules%2Fm_cloaking.cpp;h=f26e16e0e2edb7cb25a204ef0cba60f88d08c138;hb=40e990ed06126c1ba6164738527127d1f58fc032;hp=98cbd10a466f99f4a3b3ac21e608cc4e2df09c41;hpb=3103cfb80135cbc2a0f47566ec0cb88affc7bac1;p=user%2Fhenk%2Fcode%2Finspircd.git diff --git a/src/modules/m_cloaking.cpp b/src/modules/m_cloaking.cpp index 98cbd10a4..f26e16e0e 100644 --- a/src/modules/m_cloaking.cpp +++ b/src/modules/m_cloaking.cpp @@ -1,3 +1,19 @@ +/* +------------------------------------+ + * | Inspire 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. + * + * --------------------------------------------------- + */ + // Hostname cloaking (+x mode) module for inspircd. // version 1.0.0.1 by brain (C. J. Edwards) Mar 2004. // @@ -11,114 +27,414 @@ // the server->server link, and all encoding of hosts is // done locally on the server by this module. -#include +#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" /* $ModDesc: Provides masking of user hostnames */ -class ModuleCloaking : public Module -{ - private: - Server *Srv; - + +/* 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: - ModuleCloaking() + word32 buf[4]; + word32 bytes[2]; + word32 in[16]; +}; + +class CloakUser : public ModeHandler +{ + + std::string prefix; + word32 key1; + word32 key2; + word32 key3; + word32 key4; + + void byteSwap(word32 *buf, unsigned words) { - // 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)) + 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; + } + + 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) { - // 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); + 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); } - - virtual ~ModuleCloaking() + + 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; + } + 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]) { - // not really neccessary, but free it anyway - delete Srv; + 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; - virtual Version GetVersion() + xMD5Init(&context); + xMD5Update(&context, (const unsigned char*)orig, len); + xMD5Final((unsigned char*)dest, &context); + } + + + void GenHash(char* src, char* dest) { - // returns the version number of the module to be - // listed in /MODULES - return Version(1,0,0,1); + // 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); } - virtual bool OnExtendedMode(userrec* user, void* target, char modechar, int type, bool mode_on, string_list ¶ms) - { - // 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) + 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) + { + /* 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. + */ + + if (strchr(dest->host,'.') || strchr(dest->host,':')) { - // 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,"."); + /* 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]; - 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); + 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()); } + + 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; + } + + void DoRehash() + { + ConfigReader Conf(ServerInstance); + 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); + + prefix = Conf.ReadValue("cloak","prefix",0); + if (prefix == "") { - // this mode isn't ours, we have to bail and return 0 to not handle it. - return 0; + prefix = ServerInstance->Config->Network; } + 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); + } + } +}; + + +class ModuleCloaking : public Module +{ + private: + + CloakUser* cu; + + public: + ModuleCloaking(InspIRCd* Me) + : Module::Module(Me) + { + /* Create new mode handler object */ + cu = new CloakUser(ServerInstance); + + /* Register it with the core */ + ServerInstance->AddMode(cu, 'x'); + + OnRehash(""); + } + + virtual ~ModuleCloaking() + { + ServerInstance->Modes->DelMode(cu); + DELETE(cu); + } + + virtual Version GetVersion() + { + // returns the version number of the module to be + // listed in /MODULES + return Version(1,0,0,2,VF_COMMON|VF_VENDOR); + } + + virtual void OnRehash(const std::string ¶meter) + { + cu->DoRehash(); + } + + void Implements(char* List) + { + List[I_OnRehash] = List[I_OnUserConnect] = 1; } virtual void OnUserConnect(userrec* user) @@ -129,10 +445,10 @@ class ModuleCloaking : public Module // 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 + const 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" + ServerInstance->SendMode(modes,2,user); // send these, forming the command "MODE +x" } }; @@ -150,9 +466,9 @@ class ModuleCloakingFactory : public ModuleFactory { } - virtual Module * CreateModule() + virtual Module * CreateModule(InspIRCd* Me) { - return new ModuleCloaking; + return new ModuleCloaking(Me); } }; @@ -162,4 +478,3 @@ extern "C" void * init_module( void ) { return new ModuleCloakingFactory; } -