-/* +------------------------------------+\r * | Inspire Internet Relay Chat Daemon |\r * +------------------------------------+\r *\r * InspIRCd: (C) 2002-2007 InspIRCd Development Team\r * See: http://www.inspircd.org/wiki/index.php/Credits\r *\r * This program is free but copyrighted software; see\r * the file COPYING for details.\r *\r * ---------------------------------------------------\r */\r\r#include "inspircd.h"\r#include "users.h"\r#include "channels.h"\r#include "modules.h"\r\r/* $ModDesc: Provides support for RFC 1413 ident lookups */\r\r// Version 1.5.0.0 - Updated to use InspSocket, faster and neater.\r\r/** Handles RFC1413 ident connections to users\r */\rclass RFC1413 : public InspSocket\r{\r protected:\r socklen_t uslen; // length of our port number\r socklen_t themlen; // length of their port number\r char ident_request[128]; // buffer used to make up the request string\r public:\r\r userrec* u; // user record that the lookup is associated with\r int ufd;\r\r RFC1413(InspIRCd* SI, userrec* user, int maxtime, const std::string &bindto) : InspSocket(SI, user->GetIPString(), 113, false, maxtime, bindto), u(user)\r {\r ufd = user->GetFd();\r }\r\r virtual void OnTimeout()\r {\r // When we timeout, the connection failed within the allowed timeframe,\r // so we just display a notice, and tidy off the ident_data.\r if (u && (Instance->SE->GetRef(ufd) == u))\r {\r u->Shrink("ident_data");\r Instance->next_call = Instance->Time();\r }\r }\r\r virtual bool OnDataReady()\r {\r char* ibuf = this->Read();\r if (ibuf)\r {\r char* savept;\r char* section = strtok_r(ibuf,":",&savept);\r while (section)\r {\r if (strstr(section,"USERID"))\r {\r section = strtok_r(NULL,":",&savept);\r if (section)\r {\r // ID type, usually UNIX or OTHER... we dont want it, so read the next token\r section = strtok_r(NULL,":",&savept);\r if (section)\r {\r while (*section == ' ') section++; // strip leading spaces\r for (char* j = section; *j; j++)\r if ((*j < 33) || (*j > 126))\r *j = '\0'; // truncate at invalid chars\r if (*section)\r {\r if (u && (Instance->SE->GetRef(ufd) == u))\r {\r if (this->Instance->IsIdent(section))\r {\r u->Extend("IDENT", new std::string(std::string(section) + "," + std::string(u->ident)));\r strlcpy(u->ident,section,IDENTMAX);\r u->WriteServ("NOTICE "+std::string(u->nick)+" :*** Found your ident: "+std::string(u->ident));\r }\r }\r }\r return false;\r }\r }\r }\r section = strtok_r(NULL,":",&savept);\r }\r }\r return false;\r }\r\r virtual void OnClose()\r {\r // tidy up after ourselves when the connection is done.\r // We receive this event straight after a timeout, too.\r //\r //\r // OK, now listen up. The weird looking check here is\r // REQUIRED. Don't try and optimize it away.\r //\r // When a socket is closed, it is not immediately removed\r // from the socket list, there can be a short delay\r // before it is culled from the list. This means that\r // without this check, there is a chance that a user\r // may not exist when we come to ::Shrink them, which\r // results in a segfault. The value of "u" may not\r // always be NULL at this point, so, what we do is\r // check against the fd_ref_table, to see if (1) the user\r // exists, and (2) its the SAME user, on the same file\r // descriptor that they were when the lookup began.\r //\r // Fixes issue reported by webs, 7 Jun 2006\r if (u && (Instance->SE->GetRef(ufd) == u))\r {\r Instance->next_call = Instance->Time();\r u->Shrink("ident_data");\r }\r }\r\r virtual void OnError(InspSocketError e)\r {\r if (u && (Instance->SE->GetRef(ufd) == u))\r {\r if (*u->ident == '~')\r u->WriteServ("NOTICE "+std::string(u->nick)+" :*** Could not find your ident, using "+std::string(u->ident)+" instead.");\r\r Instance->next_call = Instance->Time();\r u->Shrink("ident_data");\r }\r }\r\r virtual bool OnConnected()\r {\r if (u && (Instance->SE->GetRef(ufd) == u))\r {\r sockaddr* sock_us = new sockaddr[2];\r sockaddr* sock_them = new sockaddr[2];\r bool success = false;\r uslen = sizeof(sockaddr_in);\r themlen = sizeof(sockaddr_in);\r#ifdef IPV6\r if (this->u->GetProtocolFamily() == AF_INET6)\r {\r themlen = sizeof(sockaddr_in6);\r uslen = sizeof(sockaddr_in6);\r }\r#endif\r success = ((getsockname(this->u->GetFd(),sock_us,&uslen) || getpeername(this->u->GetFd(), sock_them, &themlen)));\r if (success)\r {\r delete[] sock_us;\r delete[] sock_them;\r return false;\r }\r else\r {\r // send the request in the following format: theirsocket,oursocket\r#ifdef IPV6\r if (this->u->GetProtocolFamily() == AF_INET6)\r snprintf(ident_request,127,"%d,%d\r\n",ntohs(((sockaddr_in6*)sock_them)->sin6_port),ntohs(((sockaddr_in6*)sock_us)->sin6_port));\r else\r#endif\r snprintf(ident_request,127,"%d,%d\r\n",ntohs(((sockaddr_in*)sock_them)->sin_port),ntohs(((sockaddr_in*)sock_us)->sin_port));\r this->Write(ident_request);\r delete[] sock_us;\r delete[] sock_them;\r return true;\r }\r }\r else\r {\r Instance->next_call = Instance->Time();\r return true;\r }\r }\r};\r\rclass ModuleIdent : public Module\r{\r\r ConfigReader* Conf;\r int IdentTimeout;\r std::string PortBind;\r\r public:\r void ReadSettings()\r {\r Conf = new ConfigReader(ServerInstance);\r IdentTimeout = Conf->ReadInteger("ident", "timeout", 0, true);\r PortBind = Conf->ReadValue("ident", "bind", 0);\r if (!IdentTimeout)\r IdentTimeout = 1;\r DELETE(Conf);\r }\r\r ModuleIdent(InspIRCd* Me)\r : Module(Me)\r {\r\r ReadSettings();\r }\r\r void Implements(char* List)\r {\r List[I_OnCleanup] = List[I_OnRehash] = List[I_OnUserRegister] = List[I_OnCheckReady] = List[I_OnUserDisconnect] = 1;\r }\r\r void OnSyncUserMetaData(userrec* user, Module* proto,void* opaque, const std::string &extname, bool displayable)\r {\r if ((displayable) && (extname == "IDENT"))\r {\r std::string* ident;\r if (GetExt("IDENT", ident))\r proto->ProtoSendMetaData(opaque, TYPE_USER, user, extname, *ident);\r }\r }\r\r\r virtual void OnRehash(userrec* user, const std::string ¶meter)\r {\r ReadSettings();\r }\r\r virtual int OnUserRegister(userrec* user)\r {\r /*\r * when the new user connects, before they authenticate with USER/NICK/PASS, we do\r * their ident lookup. We do this by instantiating an object of type RFC1413, which\r * is derived from InspSocket, and inserting it into the socket engine using the\r * Server::AddSocket() call.\r */\r char newident[MAXBUF];\r strcpy(newident,"~");\r strlcat(newident,user->ident,IDENTMAX);\r strlcpy(user->ident,newident,IDENTMAX);\r \r\r user->WriteServ("NOTICE "+std::string(user->nick)+" :*** Looking up your ident...");\r RFC1413* ident = new RFC1413(ServerInstance, user, IdentTimeout, PortBind);\r if ((ident->GetState() == I_CONNECTING) || (ident->GetState() == I_CONNECTED))\r {\r user->Extend("ident_data", (char*)ident);\r }\r else\r {\r user->WriteServ("NOTICE "+std::string(user->nick)+" :*** Could not find your ident, using "+std::string(user->ident)+" instead.");\r ServerInstance->next_call = ServerInstance->Time();\r }\r return 0;\r }\r\r virtual bool OnCheckReady(userrec* user)\r {\r /*\r * The socket engine will clean up their ident request for us when it completes,\r * either due to timeout or due to closing, so, we just hold them until they dont\r * have an ident field any more.\r */\r RFC1413* ident;\r return (!user->GetExt("ident_data", ident));\r }\r\r virtual void OnCleanup(int target_type, void* item)\r {\r if (target_type == TYPE_USER)\r {\r userrec* user = (userrec*)item;\r RFC1413* ident;\r std::string* identstr;\r if (user->GetExt("ident_data", ident))\r {\r // FIX: If the user record is deleted, the socket wont be removed\r // immediately so there is chance of the socket trying to write to\r // a user which has now vanished! To prevent this, set ident::u\r // to NULL and check it so that we dont write users who have gone away.\r ident->u = NULL;\r ServerInstance->SE->DelFd(ident);\r //delete ident;\r }\r if (user->GetExt("IDENT", identstr))\r {\r delete identstr;\r }\r }\r }\r\r virtual void OnUserDisconnect(userrec* user)\r {\r /*\r * when the user quits tidy up any ident lookup they have pending to keep things tidy.\r * When we call RemoveSocket, the abstractions tied into the system evnetually work their\r * way to RFC1459::OnClose(), which shrinks off the ident_data for us, so we dont need\r * to do it here. If we don't tidy this up, there may still be lingering idents for users\r * who have quit, as class RFC1459 is only loosely bound to userrec* via a pair of pointers\r * and this would leave at least one of the invalid ;)\r */\r RFC1413* ident;\r std::string* identstr;\r if (user->GetExt("ident_data", ident))\r {\r ident->u = NULL;\r ServerInstance->SE->DelFd(ident);\r }\r if (user->GetExt("IDENT", identstr))\r {\r delete identstr;\r }\r }\r\r virtual ~ModuleIdent()\r {\r ServerInstance->next_call = ServerInstance->Time();\r }\r\r virtual Version GetVersion()\r {\r return Version(1,1,0,0,VF_VENDOR,API_VERSION);\r }\r\r};\r\rMODULE_INIT(ModuleIdent)\r
\ No newline at end of file
+/* +------------------------------------+
+ * | Inspire Internet Relay Chat Daemon |
+ * +------------------------------------+
+ *
+ * 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.
+ *
+ * ---------------------------------------------------
+ */
+
+#include "inspircd.h"
+
+/* $ModDesc: Provides support for RFC1413 ident lookups */
+
+/* --------------------------------------------------------------
+ * Note that this is the third incarnation of m_ident. The first
+ * two attempts were pretty crashy, mainly due to the fact we tried
+ * to use InspSocket/BufferedSocket to make them work. This class
+ * is ok for more heavyweight tasks, it does a lot of things behind
+ * the scenes that are not good for ident sockets and it has a huge
+ * memory footprint!
+ *
+ * To fix all the issues that we had in the old ident modules (many
+ * nasty race conditions that would cause segfaults etc) we have
+ * rewritten this module to use a simplified socket object based
+ * directly off EventHandler. As EventHandler only has low level
+ * readability, writeability and error events tied directly to the
+ * socket engine, this makes our lives easier as nothing happens to
+ * 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!
+ *
+ * Using this framework we have a much more stable module.
+ *
+ * A few things to note:
+ *
+ * O The only place that may *delete* an active or inactive
+ * ident socket is OnUserDisconnect in the module class.
+ * Because this is out of scope of the socket class there is
+ * no possibility that the socket may ever try to delete
+ * itself.
+ *
+ * O Closure of the ident socket with the Close() method will
+ * not cause removal of the socket from memory or detatchment
+ * from its 'parent' User class. It will only flag it as an
+ * inactive socket in the socket engine.
+ *
+ * O Timeouts are handled in OnCheckReaady at the same time as
+ * checking if the ident socket has a result. This is done
+ * by checking if the age the of the class (its instantiation
+ * time) plus the timeout value is greater than the current time.
+ *
+ * O The ident socket is able to but should not modify its
+ * 'parent' user directly. Instead the ident socket class sets
+ * a completion flag and during the next call to OnCheckReady,
+ * the completion flag will be checked and any result copied to
+ * that user's class. This again ensures a single point of socket
+ * deletion for safer, neater code.
+ *
+ * O The code in the constructor of the ident socket is taken from
+ * BufferedSocket but majorly thinned down. It works for both
+ * IPv4 and IPv6.
+ *
+ * O In the event that the ident socket throws a ModuleException,
+ * nothing is done. This is counted as total and complete
+ * failure to create a connection.
+ * --------------------------------------------------------------
+ */
+
+class IdentRequestSocket : public EventHandler
+{
+ private:
+ User *user; /* User we are attached to */
+ InspIRCd* ServerInstance; /* Server instance */
+ bool done; /* True if lookup is finished */
+ std::string result; /* Holds the ident string if done */
+ public:
+
+ IdentRequestSocket(InspIRCd *Server, User* u) : user(u), ServerInstance(Server), result(u->ident)
+ {
+ socklen_t size = 0;
+
+ SetFd(socket(user->server_sa.sa.sa_family, SOCK_STREAM, 0));
+
+ if (GetFd() == -1)
+ throw ModuleException("Could not create socket");
+
+ done = false;
+
+ irc::sockets::sockaddrs bindaddr;
+ irc::sockets::sockaddrs connaddr;
+
+ memcpy(&bindaddr, &user->server_sa, sizeof(bindaddr));
+ memcpy(&connaddr, &user->client_sa, sizeof(connaddr));
+
+ if (connaddr.sa.sa_family == AF_INET6)
+ {
+ bindaddr.in6.sin6_port = 0;
+ connaddr.in6.sin6_port = htons(113);
+ }
+ else
+ {
+ bindaddr.in4.sin_port = 0;
+ connaddr.in4.sin_port = htons(113);
+ }
+
+ /* Attempt to bind (ident requests must come from the ip the query is referring to */
+ if (ServerInstance->SE->Bind(GetFd(), &bindaddr.sa, size) < 0)
+ {
+ this->Close();
+ throw ModuleException("failed to bind()");
+ }
+
+ ServerInstance->SE->NonBlocking(GetFd());
+
+ /* Attempt connection (nonblocking) */
+ if (ServerInstance->SE->Connect(this, &connaddr.sa, size) == -1 && errno != EINPROGRESS)
+ {
+ this->Close();
+ throw ModuleException("connect() failed");
+ }
+
+ /* Add fd to socket engine */
+ if (!ServerInstance->SE->AddFd(this))
+ {
+ this->Close();
+ throw ModuleException("out of fds");
+ }
+
+ /* Important: We set WantWrite immediately after connect()
+ * because a successful connection will trigger a writability event
+ */
+ ServerInstance->SE->WantWrite(this);
+ }
+
+ virtual void OnConnected()
+ {
+ ServerInstance->Logs->Log("m_ident",DEBUG,"OnConnected()");
+
+ char req[32];
+
+ /* Build request in the form 'localport,remoteport\r\n' */
+ int req_size;
+ if (user->client_sa.sa.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
+ req_size = snprintf(req, sizeof(req), "%d,%d\r\n",
+ ntohs(user->client_sa.in4.sin_port), ntohs(user->server_sa.in4.sin_port));
+
+ /* 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)
+ 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
+ * from its parent user class, or attempt to delete its memory.
+ */
+ if (GetFd() > -1)
+ {
+ ServerInstance->Logs->Log("m_ident",DEBUG,"Close ident socket %d", GetFd());
+ ServerInstance->SE->DelFd(this);
+ ServerInstance->SE->Close(GetFd());
+ ServerInstance->SE->Shutdown(GetFd(), SHUT_WR);
+ this->SetFd(-1);
+ }
+ }
+
+ bool HasResult()
+ {
+ return done;
+ }
+
+ /* Note: if the lookup succeeded, will contain 'ident', otherwise
+ * will contain '~ident'. Use *GetResult() to determine lookup success.
+ */
+ const char* GetResult()
+ {
+ return result.c_str();
+ }
+
+ void ReadResponse()
+ {
+ /* 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);
+
+ /* 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()");
+
+ 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 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;
+
+ /* Rules taken from InspIRCd::IsIdent */
+ if (((*j >= 'A') && (*j <= '}')) || ((*j >= '0') && (*j <= '9')) || (*j == '-') || (*j == '.'))
+ {
+ ident += *j;
+ continue;
+ }
+
+ break;
+ }
+
+ /* Re-check with IsIdent, in case that changes and this doesn't (paranoia!) */
+ if (!ident.empty() && ServerInstance->IsIdent(ident.c_str()))
+ {
+ result = ident;
+ }
+
+ break;
+ }
+
+ /* Close (but dont delete from memory) our socket
+ * and flag as done
+ */
+ Close();
+ done = true;
+ return;
+ }
+};
+
+class ModuleIdent : public Module
+{
+ private:
+ int RequestTimeout;
+ ConfigReader *Conf;
+ public:
+ ModuleIdent(InspIRCd *Me) : Module(Me)
+ {
+ Conf = new ConfigReader(ServerInstance);
+ OnRehash(NULL);
+ Implementation eventlist[] = { I_OnRehash, I_OnUserRegister, I_OnCheckReady, I_OnCleanup, I_OnUserDisconnect };
+ ServerInstance->Modules->Attach(eventlist, this, 5);
+ }
+
+ ~ModuleIdent()
+ {
+ delete Conf;
+ }
+
+ virtual Version GetVersion()
+ {
+ return Version("$Id$", VF_VENDOR, API_VERSION);
+ }
+
+ virtual void OnRehash(User *user)
+ {
+ delete Conf;
+ Conf = new ConfigReader(ServerInstance);
+
+ RequestTimeout = Conf->ReadInteger("ident", "timeout", 0, true);
+ if (!RequestTimeout)
+ RequestTimeout = 5;
+ }
+
+ virtual int OnUserRegister(User *user)
+ {
+ for (int j = 0; j < Conf->Enumerate("connect"); j++)
+ {
+ std::string hostn = Conf->ReadValue("connect","allow",j);
+ /* XXX: Fixme: does not respect port, limit, etc */
+ if ((InspIRCd::MatchCIDR(user->GetIPString(),hostn, ascii_case_insensitive_map)) || (InspIRCd::Match(user->host,hostn, ascii_case_insensitive_map)))
+ {
+ bool useident = Conf->ReadFlag("connect", "useident", "yes", j);
+
+ if (!useident)
+ return 0;
+ }
+ }
+
+ /* User::ident is currently the username field from USER; with m_ident loaded, that
+ * should be preceded by a ~. The field is actually IdentMax+2 characters wide. */
+ if (user->ident.length() > ServerInstance->Config->Limits.IdentMax + 1)
+ user->ident.assign(user->ident, 0, ServerInstance->Config->Limits.IdentMax);
+ user->ident.insert(0, "~");
+
+ user->WriteServ("NOTICE Auth :*** Looking up your ident...");
+
+ try
+ {
+ IdentRequestSocket *isock = new IdentRequestSocket(ServerInstance, user);
+ user->Extend("ident_socket", isock);
+ }
+ catch (ModuleException &e)
+ {
+ ServerInstance->Logs->Log("m_ident",DEBUG,"Ident exception: %s", e.GetReason());
+ }
+
+ return 0;
+ }
+
+ /* This triggers pretty regularly, we can use it in preference to
+ * creating a Timer object and especially better than creating a
+ * Timer per ident lookup!
+ */
+ virtual bool OnCheckReady(User *user)
+ {
+ /* Does user have an ident socket attached at all? */
+ IdentRequestSocket *isock = NULL;
+ if (!user->GetExt("ident_socket", isock))
+ {
+ ServerInstance->Logs->Log("m_ident",DEBUG, "No ident socket :(");
+ return true;
+ }
+
+ ServerInstance->Logs->Log("m_ident",DEBUG, "Has ident_socket");
+
+ time_t compare = isock->age;
+ compare += RequestTimeout;
+
+ /* 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");
+ /* The user isnt actually disconnecting,
+ * we call this to clean up the user
+ */
+ OnUserDisconnect(user);
+ return true;
+ }
+
+ /* Got a result yet? */
+ if (!isock->HasResult())
+ {
+ ServerInstance->Logs->Log("m_ident",DEBUG, "No result yet");
+ return false;
+ }
+
+ ServerInstance->Logs->Log("m_ident",DEBUG, "Yay, result!");
+
+ /* wooo, got a result (it will be good, or bad) */
+ if (*(isock->GetResult()) != '~')
+ user->WriteServ("NOTICE Auth :*** Found your ident, '%s'", isock->GetResult());
+ else
+ user->WriteServ("NOTICE Auth :*** Could not find your ident, using %s instead.", isock->GetResult());
+
+ /* Copy the ident string to the user */
+ user->ChangeIdent(isock->GetResult());
+
+ /* The user isnt actually disconnecting, we call this to clean up the user */
+ OnUserDisconnect(user);
+ return true;
+ }
+
+ virtual void OnCleanup(int target_type, void *item)
+ {
+ /* Module unloading, tidy up users */
+ if (target_type == TYPE_USER)
+ OnUserDisconnect((User*)item);
+ }
+
+ virtual void OnUserDisconnect(User *user)
+ {
+ /* User disconnect (generic socket detatch event) */
+ IdentRequestSocket *isock = NULL;
+ if (user->GetExt("ident_socket", isock))
+ {
+ isock->Close();
+ delete isock;
+ user->Shrink("ident_socket");
+ }
+ }
+};
+
+MODULE_INIT(ModuleIdent)
+
projects / user / henk / code / inspircd.git / blobdiff