X-Git-Url: https://git.netwichtig.de/gitweb/?a=blobdiff_plain;f=src%2Fmodules%2Fm_ident.cpp;h=a0d5443d6050ed606cd0568c0283dec73d77fb0c;hb=d4685e02b55229e0ca5068b839c87b5a80180f33;hp=b7c9c1cfdef7ca8c481225093ddc66f9c4a53c5f;hpb=fcacc8e0306382bc3f938073092c3729d77e2b41;p=user%2Fhenk%2Fcode%2Finspircd.git diff --git a/src/modules/m_ident.cpp b/src/modules/m_ident.cpp index b7c9c1cfd..a0d5443d6 100644 --- a/src/modules/m_ident.cpp +++ b/src/modules/m_ident.cpp @@ -1,11 +1,13 @@ /* * InspIRCd -- Internet Relay Chat Daemon * + * Copyright (C) 2013, 2018-2020 Sadie Powell + * Copyright (C) 2012-2015 Attila Molnar + * Copyright (C) 2012-2013 Robby * Copyright (C) 2009-2010 Daniel De Graaf - * Copyright (C) 2007, 2009 John Brooks - * Copyright (C) 2006-2008 Robin Burchell - * Copyright (C) 2005-2008 Craig Edwards - * Copyright (C) 2008 Thomas Stagner + * Copyright (C) 2008 Robin Burchell + * Copyright (C) 2007, 2010 Craig Edwards + * Copyright (C) 2007 John Brooks * Copyright (C) 2007 Dennis Friis * * This file is part of InspIRCd. InspIRCd is free software: you can @@ -24,7 +26,23 @@ #include "inspircd.h" -/* $ModDesc: Provides support for RFC1413 ident lookups */ +enum +{ + // Either the ident looup has not started yet or the user is registered. + IDENT_UNKNOWN = 0, + + // Ident lookups are not enabled and a user has been marked as being skipped. + IDENT_SKIPPED, + + // Ident looups are not enabled and a user has been an insecure ident prefix. + IDENT_PREFIXED, + + // An ident lookup was done and an ident was found. + IDENT_FOUND, + + // An ident lookup was done but no ident was found + IDENT_MISSING +}; /* -------------------------------------------------------------- * Note that this is the third incarnation of m_ident. The first @@ -43,7 +61,7 @@ * our ident lookup class that is outside of this module, or out- * side of the control of the class. There are no timers, internal * events, or such, which will cause the socket to be deleted, - * queued for deletion, etc. In fact, theres not even any queueing! + * queued for deletion, etc. In fact, there's not even any queueing! * * Using this framework we have a much more stable module. * @@ -94,9 +112,8 @@ class IdentRequestSocket : public EventHandler { age = ServerInstance->Time(); - SetFd(socket(user->server_sa.sa.sa_family, SOCK_STREAM, 0)); - - if (GetFd() == -1) + SetFd(socket(user->server_sa.family(), SOCK_STREAM, 0)); + if (!HasFd()) throw ModuleException("Could not create socket"); done = false; @@ -107,7 +124,7 @@ class IdentRequestSocket : public EventHandler memcpy(&bindaddr, &user->server_sa, sizeof(bindaddr)); memcpy(&connaddr, &user->client_sa, sizeof(connaddr)); - if (connaddr.sa.sa_family == AF_INET6) + if (connaddr.family() == AF_INET6) { bindaddr.in6.sin6_port = 0; connaddr.in6.sin6_port = htons(113); @@ -119,39 +136,38 @@ class IdentRequestSocket : public EventHandler } /* Attempt to bind (ident requests must come from the ip the query is referring to */ - if (ServerInstance->SE->Bind(GetFd(), bindaddr) < 0) + if (SocketEngine::Bind(GetFd(), bindaddr) < 0) { this->Close(); throw ModuleException("failed to bind()"); } - ServerInstance->SE->NonBlocking(GetFd()); + SocketEngine::NonBlocking(GetFd()); /* Attempt connection (nonblocking) */ - if (ServerInstance->SE->Connect(this, &connaddr.sa, connaddr.sa_size()) == -1 && errno != EINPROGRESS) + if (SocketEngine::Connect(this, connaddr) == -1 && errno != EINPROGRESS) { this->Close(); throw ModuleException("connect() failed"); } /* Add fd to socket engine */ - if (!ServerInstance->SE->AddFd(this, FD_WANT_NO_READ | FD_WANT_POLL_WRITE)) + if (!SocketEngine::AddFd(this, FD_WANT_NO_READ | FD_WANT_POLL_WRITE)) { this->Close(); throw ModuleException("out of fds"); } } - virtual void OnConnected() + void OnEventHandlerWrite() CXX11_OVERRIDE { - ServerInstance->Logs->Log("m_ident",DEBUG,"OnConnected()"); - ServerInstance->SE->ChangeEventMask(this, FD_WANT_POLL_READ | FD_WANT_NO_WRITE); + SocketEngine::ChangeEventMask(this, FD_WANT_POLL_READ | FD_WANT_NO_WRITE); char req[32]; /* Build request in the form 'localport,remoteport\r\n' */ int req_size; - if (user->client_sa.sa.sa_family == AF_INET6) + if (user->client_sa.family() == AF_INET6) req_size = snprintf(req, sizeof(req), "%d,%d\r\n", ntohs(user->client_sa.in6.sin6_port), ntohs(user->server_sa.in6.sin6_port)); else @@ -161,45 +177,19 @@ class IdentRequestSocket : public EventHandler /* Send failed if we didnt write the whole ident request -- * might as well give up if this happens! */ - if (ServerInstance->SE->Send(this, req, req_size, 0) < req_size) + if (SocketEngine::Send(this, req, req_size, 0) < req_size) done = true; } - virtual void HandleEvent(EventType et, int errornum = 0) - { - switch (et) - { - case EVENT_READ: - /* fd readable event, received ident response */ - ReadResponse(); - break; - case EVENT_WRITE: - /* fd writeable event, successfully connected! */ - OnConnected(); - break; - case EVENT_ERROR: - /* fd error event, ohshi- */ - ServerInstance->Logs->Log("m_ident",DEBUG,"EVENT_ERROR"); - /* We *must* Close() here immediately or we get a - * huge storm of EVENT_ERROR events! - */ - Close(); - done = true; - break; - } - } - void Close() { - /* Remove ident socket from engine, and close it, but dont detatch it + /* Remove ident socket from engine, and close it, but dont detach it * from its parent user class, or attempt to delete its memory. */ - if (GetFd() > -1) + if (HasFd()) { - ServerInstance->Logs->Log("m_ident",DEBUG,"Close ident socket %d", GetFd()); - ServerInstance->SE->DelFd(this); - ServerInstance->SE->Close(GetFd()); - this->SetFd(-1); + ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "Close ident socket %d", GetFd()); + SocketEngine::Close(this); } } @@ -208,120 +198,159 @@ class IdentRequestSocket : public EventHandler return done; } - void ReadResponse() + void OnEventHandlerRead() CXX11_OVERRIDE { /* We don't really need to buffer for incomplete replies here, since IDENT replies are * extremely short - there is *no* sane reason it'd be in more than one packet */ - char ibuf[MAXBUF]; - int recvresult = ServerInstance->SE->Recv(this, ibuf, MAXBUF-1, 0); + char ibuf[256]; + int recvresult = SocketEngine::Recv(this, ibuf, sizeof(ibuf)-1, 0); + + /* Close (but don't delete from memory) our socket + * and flag as done since the ident lookup has finished + */ + Close(); + done = true; /* Cant possibly be a valid response shorter than 3 chars, * because the shortest possible response would look like: '1,1' */ if (recvresult < 3) - { - Close(); - done = true; return; - } - ServerInstance->Logs->Log("m_ident",DEBUG,"ReadResponse()"); + ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "ReadResponse()"); - irc::sepstream sep(ibuf, ':'); - std::string token; - for (int i = 0; sep.GetToken(token); i++) - { - /* We only really care about the 4th portion */ - if (i < 3) - continue; - - std::string ident; + /* Truncate at the first null character, but first make sure + * there is at least one null char (at the end of the buffer). + */ + ibuf[recvresult] = '\0'; + std::string buf(ibuf); - /* Truncate the ident at any characters we don't like, skip leading spaces */ - size_t k = 0; - for (const char *j = token.c_str(); *j && (k < ServerInstance->Config->Limits.IdentMax + 1); j++) - { - if (*j == ' ') - continue; + /* <2 colons: invalid + * 2 colons: reply is an error + * >3 colons: there is a colon in the ident + */ + if (std::count(buf.begin(), buf.end(), ':') != 3) + return; - /* Rules taken from InspIRCd::IsIdent */ - if (((*j >= 'A') && (*j <= '}')) || ((*j >= '0') && (*j <= '9')) || (*j == '-') || (*j == '.')) - { - ident += *j; - continue; - } + std::string::size_type lastcolon = buf.rfind(':'); + /* Truncate the ident at any characters we don't like, skip leading spaces */ + for (std::string::const_iterator i = buf.begin()+lastcolon+1; i != buf.end(); ++i) + { + if (result.size() == ServerInstance->Config->Limits.IdentMax) + /* Ident is getting too long */ break; - } - /* Re-check with IsIdent, in case that changes and this doesn't (paranoia!) */ - if (!ident.empty() && ServerInstance->IsIdent(ident.c_str())) + if (*i == ' ') + continue; + + /* Add the next char to the result and see if it's still a valid ident, + * according to IsIdent(). If it isn't, then erase what we just added and + * we're done. + */ + result += *i; + if (!ServerInstance->IsIdent(result)) { - result = ident; + result.erase(result.end()-1); + break; } - - break; } + } - /* Close (but dont delete from memory) our socket - * and flag as done - */ + void OnEventHandlerError(int errornum) CXX11_OVERRIDE + { Close(); done = true; - return; + } + + CullResult cull() CXX11_OVERRIDE + { + Close(); + return EventHandler::cull(); } }; class ModuleIdent : public Module { - int RequestTimeout; - SimpleExtItem ext; - public: - ModuleIdent() : ext("ident_socket", this) + private: + unsigned int timeout; + bool prefixunqueried; + SimpleExtItem socket; + LocalIntExt state; + + static void PrefixIdent(LocalUser* user) { - OnRehash(NULL); - Implementation eventlist[] = { - I_OnRehash, I_OnUserInit, I_OnCheckReady, - I_OnUserDisconnect, I_OnSetConnectClass - }; - ServerInstance->Modules->Attach(eventlist, this, 5); + // Check that they haven't been prefixed already. + if (user->ident[0] == '~') + return; + + // All invalid usernames are prefixed with a tilde. + std::string newident(user->ident); + newident.insert(newident.begin(), '~'); + + // If the username is too long then truncate it. + if (newident.length() > ServerInstance->Config->Limits.IdentMax) + newident.erase(ServerInstance->Config->Limits.IdentMax); + + // Apply the new username. + user->ChangeIdent(newident); } - ~ModuleIdent() + public: + ModuleIdent() + : socket("ident_socket", ExtensionItem::EXT_USER, this) + , state("ident_state", ExtensionItem::EXT_USER, this) { } - virtual Version GetVersion() + Version GetVersion() CXX11_OVERRIDE { - return Version("Provides support for RFC1413 ident lookups", VF_VENDOR); + return Version("Allows the usernames (idents) of users to be looked up using the RFC 1413 Identification Protocol.", VF_VENDOR); } - virtual void OnRehash(User *user) + void ReadConfig(ConfigStatus& status) CXX11_OVERRIDE { - ConfigReader Conf; - - RequestTimeout = Conf.ReadInteger("ident", "timeout", 0, true); - if (!RequestTimeout) - RequestTimeout = 5; + ConfigTag* tag = ServerInstance->Config->ConfValue("ident"); + timeout = tag->getDuration("timeout", 5, 1, 60); + prefixunqueried = tag->getBool("prefixunqueried"); } - void OnUserInit(LocalUser *user) + void OnSetUserIP(LocalUser* user) CXX11_OVERRIDE { + IdentRequestSocket* isock = socket.get(user); + if (isock) + { + // If an ident lookup request was in progress then cancel it. + isock->Close(); + socket.unset(user); + } + + // The ident protocol requires that clients are connecting over a protocol with ports. + if (user->client_sa.family() != AF_INET && user->client_sa.family() != AF_INET6) + return; + + // We don't want to look this up once the user has connected. + if (user->registered == REG_ALL || user->quitting) + return; + ConfigTag* tag = user->MyClass->config; if (!tag->getBool("useident", true)) + { + state.set(user, IDENT_SKIPPED); return; + } - user->WriteServ("NOTICE Auth :*** Looking up your ident..."); + user->WriteNotice("*** Looking up your ident..."); try { - IdentRequestSocket *isock = new IdentRequestSocket(IS_LOCAL(user)); - ext.set(user, isock); + isock = new IdentRequestSocket(user); + socket.set(user, isock); } catch (ModuleException &e) { - ServerInstance->Logs->Log("m_ident",DEBUG,"Ident exception: %s", e.GetReason()); + ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "Ident exception: " + e.GetReason()); } } @@ -329,79 +358,71 @@ class ModuleIdent : public Module * creating a Timer object and especially better than creating a * Timer per ident lookup! */ - virtual ModResult OnCheckReady(LocalUser *user) + ModResult OnCheckReady(LocalUser *user) CXX11_OVERRIDE { /* Does user have an ident socket attached at all? */ - IdentRequestSocket *isock = ext.get(user); + IdentRequestSocket* isock = socket.get(user); if (!isock) { - ServerInstance->Logs->Log("m_ident",DEBUG, "No ident socket :("); + if (prefixunqueried && state.get(user) == IDENT_SKIPPED) + { + PrefixIdent(user); + state.set(user, IDENT_PREFIXED); + } return MOD_RES_PASSTHRU; } - ServerInstance->Logs->Log("m_ident",DEBUG, "Has ident_socket"); - - time_t compare = isock->age; - compare += RequestTimeout; + time_t compare = isock->age + timeout; /* Check for timeout of the socket */ if (ServerInstance->Time() >= compare) { /* Ident timeout */ - user->WriteServ("NOTICE Auth :*** Ident request timed out."); - ServerInstance->Logs->Log("m_ident",DEBUG, "Timeout"); + state.set(user, IDENT_MISSING); + PrefixIdent(user); + user->WriteNotice("*** Ident lookup timed out, using " + user->ident + " instead."); } else if (!isock->HasResult()) { // time still good, no result yet... hold the registration - ServerInstance->Logs->Log("m_ident",DEBUG, "No result yet"); return MOD_RES_DENY; } - ServerInstance->Logs->Log("m_ident",DEBUG, "Yay, result!"); - /* wooo, got a result (it will be good, or bad) */ - if (isock->result.empty()) + else if (isock->result.empty()) { - user->ident.insert(0, 1, '~'); - user->WriteServ("NOTICE Auth :*** Could not find your ident, using %s instead.", user->ident.c_str()); + state.set(user, IDENT_MISSING); + PrefixIdent(user); + user->WriteNotice("*** Could not find your ident, using " + user->ident + " instead."); } else { - user->ident = isock->result; - user->WriteServ("NOTICE Auth :*** Found your ident, '%s'", user->ident.c_str()); + state.set(user, IDENT_FOUND); + user->ChangeIdent(isock->result); + user->WriteNotice("*** Found your ident, '" + user->ident + "'"); } isock->Close(); - ext.unset(user); + socket.unset(user); return MOD_RES_PASSTHRU; } - ModResult OnSetConnectClass(LocalUser* user, ConnectClass* myclass) + ModResult OnSetConnectClass(LocalUser* user, ConnectClass* myclass) CXX11_OVERRIDE { - if (myclass->config->getBool("requireident") && user->ident[0] == '~') + if (myclass->config->getBool("requireident") && state.get(user) != IDENT_FOUND) + { + ServerInstance->Logs->Log("CONNECTCLASS", LOG_DEBUG, "The %s connect class is not suitable as it requires an identd response", + myclass->GetName().c_str()); return MOD_RES_DENY; + } return MOD_RES_PASSTHRU; } - virtual void OnCleanup(int target_type, void *item) + void OnUserConnect(LocalUser* user) CXX11_OVERRIDE { - /* Module unloading, tidy up users */ - if (target_type == TYPE_USER) - OnUserDisconnect((LocalUser*)item); - } - - virtual void OnUserDisconnect(LocalUser *user) - { - /* User disconnect (generic socket detatch event) */ - IdentRequestSocket *isock = ext.get(user); - if (isock) - { - isock->Close(); - ext.unset(user); - } + // Clear this as it is no longer necessary. + state.unset(user); } }; MODULE_INIT(ModuleIdent) -