+++ /dev/null
-/* +------------------------------------+
- * | Inspire Internet Relay Chat Daemon |
- * +------------------------------------+
- *
- * InspIRCd: (C) 2002-2008 InspIRCd Development Team
- * See: http://www.inspircd.org/wiki/index.php/Credits
- *
- * This program is free but copyrighted software; see
- * the file COPYING for details.
- *
- * ---------------------------------------------------
- */
-
-#include "inspircd.h"
-#include "users.h"
-#include "channels.h"
-#include "modules.h"
-
-/* $ModDesc: Scans locally connecting clients for proxies. */
-
-/*
- * How this works: basic overview.
- * We create a socket type (derived from EventHandler -- don't feel like
- * belting my head against the wall ala ident). For each test in the
- * configuration file for each locally connecting client, we create a ProxySocket
- * and run the associated test.
- *
- * The user is allowed to connect (delaying the connect might take ages..), and they
- * will be destroyed *if* a bad response comes back to a test.
- */
-
-/*
- * 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 ProxySocket : public EventHandler
-{
- private:
- User *user; /* User we are attached to */
- InspIRCd *ServerInstance; /* Server instance */
- char challenge[10]; /* what is sent on connect, as bytes */
- int clen;
- char response[20]; /* what we kill for on recieve, as bytes */
- int rlen;
- bool done;
- public:
- ProxySocket(InspIRCd *Server, User* u, const std::string &bindip, int port, const char *cstr, int mclen, const char *rstr, int mrlen)
- {
- user = u;
- ServerInstance = Server;
- this->clen = mclen;
- this->rlen = mrlen;
-
- int i;
-
- /* byte for byte copies of challenge and response. */
- for (i = 0; i != clen; i++)
- {
- this->challenge[i] = cstr[i];
- }
-
- for (i = 0; i != rlen; i++)
- {
- this->response[i] = rstr[i];
- }
-
- socklen_t size = 0;
-#ifdef IPV6
- /* Does this look like a v6 ip address? */
- bool v6 = false;
- if ((bindip.empty()) || bindip.find(':') != std::string::npos)
- v6 = true;
-
- if (v6)
- SetFd(socket(AF_INET6, SOCK_STREAM, 0));
- else
-#endif
- SetFd(socket(AF_INET, SOCK_STREAM, 0));
-
- if (GetFd() == -1)
- throw ModuleException("Could not create socket");
-
- /* We allocate two of these because sizeof(sockaddr_in6) > sizeof(sockaddr_in) */
- sockaddr* s = new sockaddr[2];
- sockaddr* addr = new sockaddr[2];
-
-#ifdef IPV6
- /* Horrid icky nasty ugly berkely socket crap. */
- if (v6)
- {
- in6_addr addy;
- in6_addr n;
- if (inet_pton(AF_INET6, user->GetIPString(), &addy) > 0)
- {
- ((sockaddr_in6*)addr)->sin6_family = AF_INET6;
- memcpy(&((sockaddr_in6*)addr)->sin6_addr, &addy, sizeof(addy));
- ((sockaddr_in6*)addr)->sin6_port = htons(port);
- size = sizeof(sockaddr_in6);
- inet_pton(AF_INET6, bindip.c_str(), &n);
- memcpy(&((sockaddr_in6*)s)->sin6_addr, &n, sizeof(sockaddr_in6));
- ((sockaddr_in6*)s)->sin6_port = 0;
- ((sockaddr_in6*)s)->sin6_family = AF_INET6;
- }
- }
- else
-#endif
- {
- in_addr addy;
- in_addr n;
- if (inet_aton(user->GetIPString(), &addy) > 0)
- {
- ((sockaddr_in*)addr)->sin_family = AF_INET;
- ((sockaddr_in*)addr)->sin_addr = addy;
- ((sockaddr_in*)addr)->sin_port = htons(port);
- size = sizeof(sockaddr_in);
- inet_aton(bindip.c_str(), &n);
- ((sockaddr_in*)s)->sin_addr = n;
- ((sockaddr_in*)s)->sin_port = 0;
- ((sockaddr_in*)s)->sin_family = AF_INET;
- }
- }
-
- /* Attempt to bind (ident requests must come from the ip the query is referring to */
- if (ServerInstance->SE->Bind(GetFd(), s, size) < 0)
- {
- this->Close();
- delete[] s;
- delete[] addr;
- throw ModuleException("failed to bind()");
- }
-
- delete[] s;
- ServerInstance->SE->NonBlocking(GetFd());
-
- /* Attempt connection (nonblocking) */
- if (ServerInstance->SE->Connect(this, (sockaddr*)addr, size) == -1 && errno != EINPROGRESS)
- {
- this->Close();
- delete[] addr;
- throw ModuleException("connect() failed");
- }
-
- delete[] addr;
-
- /* 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_proxyscan",DEBUG,"OnConnected()");
-
- /* Both sockaddr_in and sockaddr_in6 can be safely casted to sockaddr, especially since the
- * only members we use are in a part of the struct that should always be identical (at the
- * byte level). */
- #ifndef IPV6
- sockaddr_in laddr, raddr;
- #else
- sockaddr_in6 laddr, raddr;
- #endif
-
- socklen_t laddrsz = sizeof(laddr);
- socklen_t raddrsz = sizeof(raddr);
-
- if ((getsockname(user->GetFd(), (sockaddr*) &laddr, &laddrsz) != 0) || (getpeername(user->GetFd(), (sockaddr*) &raddr, &raddrsz) != 0))
- {
- done = true;
- return;
- }
-
- /* Send failed if we didnt write the whole ident request --
- * might as well give up if this happens!
- */
- ServerInstance->Logs->Log("m_proxyscan",DEBUG, "Sending");
- if (ServerInstance->SE->Send(this, this->challenge, this->clen, 0) < this->clen)
- {
- ServerInstance->Logs->Log("m_proxyscan",DEBUG, "Send incomplete");
- 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_proxyscan",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_proxyscan",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;
- }
-
- 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);
-
- ServerInstance->Logs->Log("m_proxyscan",DEBUG,"ReadResponse(): %s -- %d", ibuf, recvresult);
-
- bool match = true;
- int i;
-
- for (i = 0; i != this->rlen && i != recvresult; i++)
- {
- if (this->response[i] != ibuf[i])
- {
- ServerInstance->Logs->Log("m_proxyscan",DEBUG, "No match at pos %d: %c ne %c", i, this->response[i], ibuf[i]);
- /* no match */
- match = false;
- }
- }
-
- if (match == true)
- {
- ServerInstance->Users->QuitUser(this->user, "Open proxy detected.");
- }
-
- /* Close (but dont delete from memory) our socket
- * and flag as done
- */
- Close();
- done = true;
- return;
- }
-};
-
-class ModuleProxy : public Module
-{
- private:
- int RequestTimeout;
- public:
- ModuleProxy(InspIRCd *Me)
- : Module(Me)
- {
- OnRehash(NULL, "");
- Implementation eventlist[] = { I_OnRehash, I_OnUserRegister, I_OnCleanup, I_OnUserDisconnect };
- ServerInstance->Modules->Attach(eventlist, this, 4);
- }
-
- virtual Version GetVersion()
- {
- return Version(1, 2, 1, 0, VF_VENDOR, API_VERSION);
- }
-
-
- virtual void OnRehash(User *user, const std::string ¶m)
- {
- ConfigReader MyConf(ServerInstance);
-
- RequestTimeout = MyConf.ReadInteger("ident", "timeout", 0, true);
- if (!RequestTimeout)
- RequestTimeout = 5;
- }
-
- virtual int OnUserRegister(User *user)
- {
- user->WriteServ("NOTICE Auth :*** Checking you for proxies...");
-
- // Get the IP that the user is connected to, and bind to that for the outgoing connection
- #ifndef IPV6
- sockaddr_in laddr;
- #else
- sockaddr_in6 laddr;
- #endif
- socklen_t laddrsz = sizeof(laddr);
-
- if (getsockname(user->GetFd(), (sockaddr*) &laddr, &laddrsz) != 0)
- {
- return 0;
- }
-
- #ifndef IPV6
- const char *ip = inet_ntoa(laddr.sin_addr);
- #else
- char ip[INET6_ADDRSTRLEN + 1];
- inet_ntop(laddr.sin6_family, &laddr.sin6_addr, ip, INET6_ADDRSTRLEN);
- #endif
-
- ProxySocket *p = NULL;
- try
- {
- p = new ProxySocket(ServerInstance, user, ip, 80, "GET /\n", 7, "Nothing here.", 12);
- }
- catch (ModuleException &e)
- {
- ServerInstance->Logs->Log("m_proxyscan",DEBUG,"Proxy exception: %s", e.GetReason());
- return 0;
- }
-
- user->Extend("proxy_socket", p);
- return 0;
- }
-
- 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) */
- ProxySocket *p = NULL;
- if (user->GetExt("proxy_socket", p))
- {
- p->Close();
- delete p;
- user->Shrink("proxy_socket");
- ServerInstance->Logs->Log("m_proxyscan",DEBUG, "Removed proxy socket from %s", user->nick.c_str());
- }
- }
-};
-
-MODULE_INIT(ModuleProxy)
-
projects / user / henk / code / inspircd.git / commitdiff