X-Git-Url: https://git.netwichtig.de/gitweb/?a=blobdiff_plain;f=src%2Fmodules%2Fm_ident.cpp;h=0f746b05b1e0340f4f863c3260f8233fa7b0796f;hb=HEAD;hp=959e58a479d03c9d02e61c92cc74dec5a8b2075b;hpb=4fc2f7199e964ba5112ecdb2613c6fd5c2eee638;p=user%2Fhenk%2Fcode%2Finspircd.git diff --git a/src/modules/m_ident.cpp b/src/modules/m_ident.cpp index 959e58a47..0f746b05b 100644 --- a/src/modules/m_ident.cpp +++ b/src/modules/m_ident.cpp @@ -1,12 +1,14 @@ /* * 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 John Brooks * Copyright (C) 2007 Dennis Friis + * Copyright (C) 2005, 2007, 2010 Craig Edwards * * 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 @@ -24,6 +26,24 @@ #include "inspircd.h" +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 * two attempts were pretty crashy, mainly due to the fact we tried @@ -41,7 +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. * @@ -92,9 +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; @@ -105,7 +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); @@ -126,7 +145,7 @@ class IdentRequestSocket : public EventHandler SocketEngine::NonBlocking(GetFd()); /* Attempt connection (nonblocking) */ - if (SocketEngine::Connect(this, &connaddr.sa, connaddr.sa_size()) == -1 && errno != EINPROGRESS) + if (SocketEngine::Connect(this, connaddr) == -1 && errno != EINPROGRESS) { this->Close(); throw ModuleException("connect() failed"); @@ -140,16 +159,15 @@ class IdentRequestSocket : public EventHandler } } - void OnConnected() + void OnEventHandlerWrite() CXX11_OVERRIDE { - ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "OnConnected()"); 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 @@ -163,36 +181,12 @@ class IdentRequestSocket : public EventHandler done = true; } - 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(MODNAME, LOG_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(MODNAME, LOG_DEBUG, "Close ident socket %d", GetFd()); SocketEngine::Close(this); @@ -204,7 +198,7 @@ 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 @@ -264,6 +258,12 @@ class IdentRequestSocket : public EventHandler } } + void OnEventHandlerError(int errornum) CXX11_OVERRIDE + { + Close(); + done = true; + } + CullResult cull() CXX11_OVERRIDE { Close(); @@ -273,39 +273,80 @@ class IdentRequestSocket : public EventHandler class ModuleIdent : public Module { - int RequestTimeout; - bool NoLookupPrefix; - SimpleExtItem ext; + private: + unsigned int timeout; + bool prefixunqueried; + SimpleExtItem socket; + LocalIntExt state; + + static void PrefixIdent(LocalUser* user) + { + // 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); + } + public: ModuleIdent() - : ext("ident_socket", ExtensionItem::EXT_USER, this) + : socket("ident_socket", ExtensionItem::EXT_USER, this) + , state("ident_state", ExtensionItem::EXT_USER, this) { } 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); } void ReadConfig(ConfigStatus& status) CXX11_OVERRIDE { ConfigTag* tag = ServerInstance->Config->ConfValue("ident"); - RequestTimeout = tag->getInt("timeout", 5, 1); - NoLookupPrefix = tag->getBool("nolookupprefix", false); + timeout = tag->getDuration("timeout", 5, 1, 60); + prefixunqueried = tag->getBool("prefixunqueried"); } - void OnUserInit(LocalUser *user) CXX11_OVERRIDE + 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->WriteNotice("*** Looking up your ident..."); try { - IdentRequestSocket *isock = new IdentRequestSocket(user); - ext.set(user, isock); + isock = new IdentRequestSocket(user); + socket.set(user, isock); } catch (ModuleException &e) { @@ -320,22 +361,26 @@ class ModuleIdent : public Module 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) { - if ((NoLookupPrefix) && (user->ident[0] != '~')) - user->ident.insert(user->ident.begin(), 1, '~'); + if (prefixunqueried && state.get(user) == IDENT_SKIPPED) + { + PrefixIdent(user); + state.set(user, IDENT_PREFIXED); + } return MOD_RES_PASSTHRU; } - 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->WriteNotice("*** Ident request timed out."); + state.set(user, IDENT_MISSING); + PrefixIdent(user); + user->WriteNotice("*** Ident lookup timed out, using " + user->ident + " instead."); } else if (!isock->HasResult()) { @@ -344,29 +389,40 @@ class ModuleIdent : public Module } /* wooo, got a result (it will be good, or bad) */ - if (isock->result.empty()) + else if (isock->result.empty()) { - user->ident.insert(user->ident.begin(), 1, '~'); + state.set(user, IDENT_MISSING); + PrefixIdent(user); user->WriteNotice("*** Could not find your ident, using " + user->ident + " instead."); } else { - user->ident = isock->result; + state.set(user, IDENT_FOUND); + user->ChangeIdent(isock->result); user->WriteNotice("*** Found your ident, '" + user->ident + "'"); } - user->InvalidateCache(); isock->Close(); - ext.unset(user); + socket.unset(user); return MOD_RES_PASSTHRU; } 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; } + + void OnUserConnect(LocalUser* user) CXX11_OVERRIDE + { + // Clear this as it is no longer necessary. + state.unset(user); + } }; MODULE_INIT(ModuleIdent)