--- /dev/null
+#include <string>
+#include <vector>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <gnutls/gnutls.h>
+
+#include "users.h"
+#include "channels.h"
+#include "modules.h"
+#include "helperfuncs.h"
+#include "socket.h"
+#include "hashcomp.h"
+
+/* $ModDesc: Provides SSL support for clients */
+/* $CompileFlags: `libgnutls-config --cflags` */
+/* $LinkerFlags: -L/usr/local/lib -Wl,--rpath -Wl,/usr/local/lib -L/usr/lib -Wl,--rpath -Wl,/usr/lib -lgnutls */
+
+enum issl_status { ISSL_NONE, ISSL_HANDSHAKING_READ, ISSL_HANDSHAKING_WRITE, ISSL_HANDSHAKEN, ISSL_CLOSING, ISSL_CLOSED };
+
+class issl_session
+{
+public:
+ gnutls_session_t sess;
+ issl_status status;
+ std::string outbuf;
+ int inbufoffset;
+ char* inbuf;
+ int fd;
+};
+
+class ModuleSSL : public Module
+{
+ Server* Srv;
+ ServerConfig* SrvConf;
+ ConfigReader* Conf;
+
+ std::vector<int> listenports;
+
+ int inbufsize;
+ issl_session sessions[MAX_DESCRIPTORS];
+
+ gnutls_certificate_credentials x509_cred;
+ gnutls_dh_params dh_params;
+
+ std::string keyfile;
+ std::string certfile;
+ std::string cafile;
+ std::string crlfile;
+ int dh_bits;
+
+ public:
+
+ ModuleSSL(Server* Me)
+ : Module::Module(Me)
+ {
+ Srv = Me;
+ SrvConf = Srv->GetConfig();
+ Conf = new ConfigReader;
+
+ // Not rehashable...because I cba to reduce all the sizes of existing buffers.
+ inbufsize = SrvConf->NetBufferSize;
+
+ gnutls_global_init(); // This must be called once in the program
+
+ if(gnutls_certificate_allocate_credentials(&x509_cred) != 0)
+ log(DEBUG, "m_ssl_gnutls.so: Failed to allocate certificate credentials");
+
+ // Guessing return meaning
+ if(gnutls_dh_params_init(&dh_params) < 0)
+ log(DEBUG, "m_ssl_gnutls.so: Failed to initialise DH parameters");
+
+ OnRehash("");
+
+ // Void return, guess we assume success
+ gnutls_certificate_set_dh_params(x509_cred, dh_params);
+ }
+
+ virtual void OnRehash(std::string param)
+ {
+ delete Conf;
+ Conf = new ConfigReader;
+
+ for(unsigned int i = 0; i < listenports.size(); i++)
+ {
+ SrvConf->DelIOHook(listenports[i]);
+ }
+
+ listenports.clear();
+
+ for(int i = 0; i < Conf->Enumerate("bind"); i++)
+ {
+ // For each <bind> tag
+ if((Conf->ReadValue("bind", "type", i) == "clients") && (Conf->ReadValue("bind", "ssl", i) == "gnutls"))
+ {
+ // Get the port we're meant to be listening on with SSL
+ unsigned int port = Conf->ReadInteger("bind", "port", i, true);
+ SrvConf->AddIOHook(port, this);
+
+ // We keep a record of which ports we're listening on with SSL
+ listenports.push_back(port);
+
+ log(DEFAULT, "m_ssl_gnutls.so: Enabling SSL for port %d", port);
+ }
+ }
+
+ cafile = Conf->ReadValue("gnutls", "cafile", 0);
+ crlfile = Conf->ReadValue("gnutls", "crlfile", 0);
+ certfile = Conf->ReadValue("gnutls", "certfile", 0);
+ keyfile = Conf->ReadValue("gnutls", "keyfile", 0);
+ dh_bits = Conf->ReadInteger("gnutls", "dhbits", 0, false);
+
+ if(cafile == "")
+ cafile = "conf/ca.pem";
+
+ if(crlfile == "")
+ crlfile = "conf/crl.pem";
+
+ if(certfile == "")
+ certfile = "conf/cert.pem";
+
+ if(keyfile == "")
+ keyfile = "conf/key.pem";
+
+ if((dh_bits != 768) && (dh_bits != 1024) && (dh_bits != 2048) && (dh_bits != 3072) && (dh_bits != 4096))
+ dh_bits = 1024;
+
+ if(gnutls_certificate_set_x509_trust_file(x509_cred, cafile.c_str(), GNUTLS_X509_FMT_PEM) < 0)
+ log(DEBUG, "m_ssl_gnutls.so: Failed to set X.509 trust file: %s", cafile.c_str());
+
+ if(gnutls_certificate_set_x509_crl_file (x509_cred, crlfile.c_str(), GNUTLS_X509_FMT_PEM) < 0)
+ log(DEBUG, "m_ssl_gnutls.so: Failed to set X.509 CRL file: %s", crlfile.c_str());
+
+ // Guessing on the return value of this, manual doesn't say :|
+ if(gnutls_certificate_set_x509_key_file (x509_cred, certfile.c_str(), keyfile.c_str(), GNUTLS_X509_FMT_PEM) < 0)
+ log(DEBUG, "m_ssl_gnutls.so: Failed to set X.509 certificate and key files: %s and %s", certfile.c_str(), keyfile.c_str());
+
+ // Generate Diffie Hellman parameters - for use with DHE
+ // kx algorithms. These should be discarded and regenerated
+ // once a day, once a week or once a month. Depending on the
+ // security requirements.
+
+ if(gnutls_dh_params_generate2(dh_params, dh_bits) < 0)
+ log(DEBUG, "m_ssl_gnutls.so: Failed to generate DH parameters (%d bits)", dh_bits);
+ }
+
+ virtual ~ModuleSSL()
+ {
+ delete Conf;
+ gnutls_dh_params_deinit(dh_params);
+ gnutls_certificate_free_credentials(x509_cred);
+ gnutls_global_deinit();
+ }
+
+ virtual Version GetVersion()
+ {
+ return Version(1, 0, 0, 0, 0);
+ }
+
+ void Implements(char* List)
+ {
+ List[I_OnRawSocketAccept] = List[I_OnRawSocketClose] = List[I_OnRawSocketRead] = List[I_OnRawSocketWrite] = 1;
+ List[I_OnSyncUserMetaData] = List[I_OnDecodeMetaData] = List[I_OnUserQuit] = List[I_OnRehash] = List[I_OnWhois] = 1;
+ }
+
+ virtual void OnRawSocketAccept(int fd, std::string ip, int localport)
+ {
+ issl_session* session = &sessions[fd];
+
+ session->fd = fd;
+ session->inbuf = new char[inbufsize];
+ session->inbufoffset = 0;
+
+ gnutls_init(&session->sess, GNUTLS_SERVER);
+
+ gnutls_set_default_priority(session->sess); // Avoid calling all the priority functions, defaults are adequate.
+ gnutls_credentials_set(session->sess, GNUTLS_CRD_CERTIFICATE, x509_cred);
+ gnutls_certificate_server_set_request(session->sess, GNUTLS_CERT_REQUEST); // Request client certificate if any.
+ gnutls_dh_set_prime_bits(session->sess, dh_bits);
+ gnutls_transport_set_ptr(session->sess, (gnutls_transport_ptr_t) fd); // Give gnutls the fd for the socket.
+
+ Handshake(session);
+ }
+
+ virtual void OnRawSocketClose(int fd)
+ {
+ CloseSession(&sessions[fd]);
+ }
+
+ virtual int OnRawSocketRead(int fd, char* buffer, unsigned int count, int &readresult)
+ {
+ issl_session* session = &sessions[fd];
+
+ if(!session->sess)
+ {
+ log(DEBUG, "m_ssl_gnutls.so: OnRawSocketRead: No session to read from");
+ readresult = 0;
+ CloseSession(session);
+ return 1;
+ }
+
+ log(DEBUG, "m_ssl_gnutls.so: OnRawSocketRead(%d, buffer, %u, %d)", fd, count, readresult);
+
+ if(session->status == ISSL_HANDSHAKING_READ)
+ {
+ // The handshake isn't finished, try to finish it.
+
+ if(Handshake(session))
+ {
+ // Handshake successfully resumed.
+ log(DEBUG, "m_ssl_gnutls.so: OnRawSocketRead: successfully resumed handshake");
+ }
+ else
+ {
+ // Couldn't resume handshake.
+ log(DEBUG, "m_ssl_gnutls.so: OnRawSocketRead: failed to resume handshake");
+ return -1;
+ }
+ }
+ else if(session->status == ISSL_HANDSHAKING_WRITE)
+ {
+ log(DEBUG, "m_ssl_gnutls.so: OnRawSocketRead: handshake wants to write data but we are currently reading");
+ return -1;
+ }
+
+ // If we resumed the handshake then session->status will be ISSL_HANDSHAKEN.
+
+ if(session->status == ISSL_HANDSHAKEN)
+ {
+ // Is this right? Not sure if the unencrypted data is garaunteed to be the same length.
+ // Read into the inbuffer, offset from the beginning by the amount of data we have that insp hasn't taken yet.
+ log(DEBUG, "m_ssl_gnutls.so: gnutls_record_recv(sess, inbuf+%d, %d-%d)", session->inbufoffset, inbufsize, session->inbufoffset);
+
+ int ret = gnutls_record_recv(session->sess, session->inbuf + session->inbufoffset, inbufsize - session->inbufoffset);
+
+ if(ret == 0)
+ {
+ // Client closed connection.
+ log(DEBUG, "m_ssl_gnutls.so: Client closed the connection");
+ readresult = 0;
+ CloseSession(session);
+ return 1;
+ }
+ else if(ret < 0)
+ {
+ if(ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED)
+ {
+ log(DEBUG, "m_ssl_gnutls.so: OnRawSocketRead: Not all SSL data read: %s", gnutls_strerror(ret));
+ return -1;
+ }
+ else
+ {
+ log(DEBUG, "m_ssl_gnutls.so: OnRawSocketRead: Error reading SSL data: %s", gnutls_strerror(ret));
+ readresult = 0;
+ CloseSession(session);
+ }
+ }
+ else
+ {
+ // Read successfully 'ret' bytes into inbuf + inbufoffset
+ // There are 'ret' + 'inbufoffset' bytes of data in 'inbuf'
+ // 'buffer' is 'count' long
+
+ unsigned int length = ret + session->inbufoffset;
+
+ log(DEBUG, "m_ssl_gnutls.so: OnRawSocketRead: Read %d bytes, now have %d waiting to be passed up", ret, length);
+
+ if(count <= length)
+ {
+ memcpy(buffer, session->inbuf, count);
+ // Move the stuff left in inbuf to the beginning of it
+ memcpy(session->inbuf, session->inbuf + count, (length - count));
+ // Now we need to set session->inbufoffset to the amount of data still waiting to be handed to insp.
+ session->inbufoffset = length - count;
+ // Insp uses readresult as the count of how much data there is in buffer, so:
+ readresult = count;
+ }
+ else
+ {
+ // There's not as much in the inbuf as there is space in the buffer, so just copy the whole thing.
+ memcpy(buffer, session->inbuf, length);
+ // Zero the offset, as there's nothing there..
+ session->inbufoffset = 0;
+ // As above
+ readresult = length;
+ }
+
+ log(DEBUG, "m_ssl_gnutls.so: OnRawSocketRead: Passing %d bytes up to insp:");
+ Srv->Log(DEBUG, std::string(buffer, readresult));
+ }
+ }
+ else if(session->status == ISSL_CLOSING)
+ {
+ log(DEBUG, "m_ssl_gnutls.so: OnRawSocketRead: session closing...");
+ readresult = 0;
+ }
+
+ return 1;
+ }
+
+ virtual int OnRawSocketWrite(int fd, char* buffer, int count)
+ {
+ issl_session* session = &sessions[fd];
+ const char* sendbuffer = buffer;
+
+ if(!session->sess)
+ {
+ log(DEBUG, "m_ssl_gnutls.so: OnRawSocketWrite: No session to write to");
+ CloseSession(session);
+ return 1;
+ }
+
+ if(session->status == ISSL_HANDSHAKING_WRITE)
+ {
+ // The handshake isn't finished, try to finish it.
+
+ if(Handshake(session))
+ {
+ // Handshake successfully resumed.
+ log(DEBUG, "m_ssl_gnutls.so: OnRawSocketWrite: successfully resumed handshake");
+ }
+ else
+ {
+ // Couldn't resume handshake.
+ log(DEBUG, "m_ssl_gnutls.so: OnRawSocketWrite: failed to resume handshake");
+ }
+ }
+ else if(session->status == ISSL_HANDSHAKING_READ)
+ {
+ log(DEBUG, "m_ssl_gnutls.so: OnRawSocketWrite: handshake wants to read data but we are currently writing");
+ }
+
+ log(DEBUG, "m_ssl_gnutls.so: OnRawSocketWrite: Adding %d bytes to the outgoing buffer", count);
+ session->outbuf.append(sendbuffer, count);
+ sendbuffer = session->outbuf.c_str();
+ count = session->outbuf.size();
+
+ if(session->status == ISSL_HANDSHAKEN)
+ {
+ log(DEBUG, "m_ssl_gnutls.so: OnRawSocketWrite: Trying to write %d bytes:", count);
+ Srv->Log(DEBUG, session->outbuf);
+
+ int ret = gnutls_record_send(session->sess, sendbuffer, count);
+
+ if(ret == 0)
+ {
+ log(DEBUG, "m_ssl_gnutls.so: OnRawSocketWrite: Client closed the connection");
+ CloseSession(session);
+ }
+ else if(ret < 0)
+ {
+ if(ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED)
+ {
+ log(DEBUG, "m_ssl_gnutls.so: OnRawSocketWrite: Not all SSL data written: %s", gnutls_strerror(ret));
+ }
+ else
+ {
+ log(DEBUG, "m_ssl_gnutls.so: OnRawSocketWrite: Error writing SSL data: %s", gnutls_strerror(ret));
+ CloseSession(session);
+ }
+ }
+ else
+ {
+ log(DEBUG, "m_ssl_gnutls.so: OnRawSocketWrite: Successfully wrote %d bytes", ret);
+ session->outbuf = session->outbuf.substr(ret);
+ }
+ }
+ else if(session->status == ISSL_CLOSING)
+ {
+ log(DEBUG, "m_ssl_gnutls.so: OnRawSocketWrite: session closing...");
+ }
+
+ return 1;
+ }
+
+ virtual void OnUserQuit(userrec* user, std::string reason)
+ {
+ CloseSession(&sessions[user->fd]);
+ }
+
+ // :kenny.chatspike.net 320 Om Epy|AFK :is a Secure Connection
+ virtual void OnWhois(userrec* source, userrec* dest)
+ {
+ if(dest->GetExt("ssl"))
+ {
+ WriteServ(source->fd, "320 %s %s :is a Secure Connection", source->nick, dest->nick);
+ }
+ }
+
+ virtual void OnSyncUserMetaData(userrec* user, Module* proto, void* opaque, std::string extname)
+ {
+ // check if the linking module wants to know about OUR metadata
+ if(extname == "ssl")
+ {
+ // check if this user has an swhois field to send
+ if(user->GetExt(extname))
+ {
+ // call this function in the linking module, let it format the data how it
+ // sees fit, and send it on its way. We dont need or want to know how.
+ proto->ProtoSendMetaData(opaque, TYPE_USER, user, extname, "ON");
+ }
+ }
+ }
+
+ virtual void OnDecodeMetaData(int target_type, void* target, std::string extname, std::string extdata)
+ {
+ // check if its our metadata key, and its associated with a user
+ if ((target_type == TYPE_USER) && (extname == "ssl"))
+ {
+ userrec* dest = (userrec*)target;
+ // if they dont already have an ssl flag, accept the remote server's
+ if (!dest->GetExt(extname))
+ {
+ dest->Extend(extname, "ON");
+ }
+ }
+ }
+
+ bool Handshake(issl_session* session)
+ {
+ int ret = gnutls_handshake(session->sess);
+
+ if(ret < 0)
+ {
+ if(ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED)
+ {
+ // Handshake needs resuming later, read() or write() would have blocked.
+
+ if(gnutls_record_get_direction(session->sess) == 0)
+ {
+ // gnutls_handshake() wants to read() again.
+ session->status = ISSL_HANDSHAKING_READ;
+ log(DEBUG, "m_ssl_gnutls.so: Handshake needs resuming (reading) later, error string: %s", gnutls_strerror(ret));
+ }
+ else
+ {
+ // gnutls_handshake() wants to write() again.
+ session->status = ISSL_HANDSHAKING_WRITE;
+ log(DEBUG, "m_ssl_gnutls.so: Handshake needs resuming (writing) later, error string: %s", gnutls_strerror(ret));
+ MakePollWrite(session);
+ }
+ }
+ else
+ {
+ // Handshake failed.
+ CloseSession(session);
+ log(DEBUG, "m_ssl_gnutls.so: Handshake failed, error string: %s", gnutls_strerror(ret));
+ session->status = ISSL_CLOSING;
+ }
+
+ return false;
+ }
+ else
+ {
+ // Handshake complete.
+ log(DEBUG, "m_ssl_gnutls.so: Handshake completed");
+
+ // This will do for setting the ssl flag...it could be done earlier if it's needed. But this seems neater.
+ Srv->FindDescriptor(session->fd)->Extend("ssl", "ON");
+
+ session->status = ISSL_HANDSHAKEN;
+
+ MakePollWrite(session);
+
+ return true;
+ }
+ }
+
+ void MakePollWrite(issl_session* session)
+ {
+ OnRawSocketWrite(session->fd, NULL, 0);
+ }
+
+ void CloseSession(issl_session* session)
+ {
+ if(session->sess)
+ {
+ gnutls_bye(session->sess, GNUTLS_SHUT_WR);
+ gnutls_deinit(session->sess);
+ }
+
+ if(session->inbuf)
+ {
+ delete[] session->inbuf;
+ }
+
+ session->outbuf.clear();
+ session->inbuf = NULL;
+ session->sess = NULL;
+ session->status = ISSL_NONE;
+ }
+};
+
+class ModuleSSLFactory : public ModuleFactory
+{
+ public:
+ ModuleSSLFactory()
+ {
+ }
+
+ ~ModuleSSLFactory()
+ {
+ }
+
+ virtual Module * CreateModule(Server* Me)
+ {
+ return new ModuleSSL(Me);
+ }
+};
+
+
+extern "C" void * init_module( void )
+{
+ return new ModuleSSLFactory;
+}
+
projects / user / henk / code / inspircd.git / commitdiff