/* * InspIRCd -- Internet Relay Chat Daemon * * Copyright (C) 2009-2010 Daniel De Graaf * Copyright (C) 2008 John Brooks * Copyright (C) 2006-2008 Craig Edwards * Copyright (C) 2007 Dennis Friis * Copyright (C) 2006 Oliver Lupton * * 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 * License as published by the Free Software Foundation, version 2. * * This program is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more * details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see . */ #include "inspircd.h" #include #include #include #include "modules/ssl.h" #include "modules/cap.h" #ifdef _WIN32 # pragma comment(lib, "libgnutls.lib") # pragma comment(lib, "libgcrypt.lib") # pragma comment(lib, "libgpg-error.lib") # pragma comment(lib, "user32.lib") # pragma comment(lib, "advapi32.lib") # pragma comment(lib, "libgcc.lib") # pragma comment(lib, "libmingwex.lib") # pragma comment(lib, "gdi32.lib") #endif /* $ModDesc: Provides SSL support for clients */ /* $CompileFlags: pkgconfincludes("gnutls","/gnutls/gnutls.h","") exec("libgcrypt-config --cflags") */ /* $LinkerFlags: rpath("pkg-config --libs gnutls") pkgconflibs("gnutls","/libgnutls.so","-lgnutls") exec("libgcrypt-config --libs") */ /* $NoPedantic */ // These don't exist in older GnuTLS versions #if ((GNUTLS_VERSION_MAJOR > 2) || (GNUTLS_VERSION_MAJOR == 2 && GNUTLS_VERSION_MINOR > 1) || (GNUTLS_VERSION_MAJOR == 2 && GNUTLS_VERSION_MINOR == 1 && GNUTLS_VERSION_MICRO >= 7)) #define GNUTLS_NEW_PRIO_API #endif #if(GNUTLS_VERSION_MAJOR < 2) typedef gnutls_certificate_credentials_t gnutls_certificate_credentials; typedef gnutls_dh_params_t gnutls_dh_params; #endif enum issl_status { ISSL_NONE, ISSL_HANDSHAKING_READ, ISSL_HANDSHAKING_WRITE, ISSL_HANDSHAKEN, ISSL_CLOSING, ISSL_CLOSED }; static std::vector x509_certs; static gnutls_x509_privkey_t x509_key; #if(GNUTLS_VERSION_MAJOR < 2 || ( GNUTLS_VERSION_MAJOR == 2 && GNUTLS_VERSION_MINOR < 12 ) ) static int cert_callback (gnutls_session_t session, const gnutls_datum_t * req_ca_rdn, int nreqs, const gnutls_pk_algorithm_t * sign_algos, int sign_algos_length, gnutls_retr_st * st) { st->type = GNUTLS_CRT_X509; #else static int cert_callback (gnutls_session_t session, const gnutls_datum_t * req_ca_rdn, int nreqs, const gnutls_pk_algorithm_t * sign_algos, int sign_algos_length, gnutls_retr2_st * st) { st->cert_type = GNUTLS_CRT_X509; st->key_type = GNUTLS_PRIVKEY_X509; #endif st->ncerts = x509_certs.size(); st->cert.x509 = &x509_certs[0]; st->key.x509 = x509_key; st->deinit_all = 0; return 0; } class RandGen : public HandlerBase2 { public: RandGen() {} void Call(char* buffer, size_t len) { gcry_randomize(buffer, len, GCRY_STRONG_RANDOM); } }; /** Represents an SSL user's extra data */ class issl_session { public: StreamSocket* socket; gnutls_session_t sess; issl_status status; reference cert; issl_session() : socket(NULL), sess(NULL) {} }; class CommandStartTLS : public SplitCommand { public: bool enabled; CommandStartTLS (Module* mod) : SplitCommand(mod, "STARTTLS") { enabled = true; works_before_reg = true; } CmdResult HandleLocal(const std::vector ¶meters, LocalUser *user) { if (!enabled) { user->WriteNumeric(691, "%s :STARTTLS is not enabled", user->nick.c_str()); return CMD_FAILURE; } if (user->registered == REG_ALL) { user->WriteNumeric(691, "%s :STARTTLS is not permitted after client registration is complete", user->nick.c_str()); } else { if (!user->eh.GetIOHook()) { user->WriteNumeric(670, "%s :STARTTLS successful, go ahead with TLS handshake", user->nick.c_str()); /* We need to flush the write buffer prior to adding the IOHook, * otherwise we'll be sending this line inside the SSL session - which * won't start its handshake until the client gets this line. Currently, * we assume the write will not block here; this is usually safe, as * STARTTLS is sent very early on in the registration phase, where the * user hasn't built up much sendq. Handling a blocked write here would * be very annoying. */ user->eh.DoWrite(); user->eh.AddIOHook(creator); creator->OnStreamSocketAccept(&user->eh, NULL, NULL); } else user->WriteNumeric(691, "%s :STARTTLS failure", user->nick.c_str()); } return CMD_FAILURE; } }; class ModuleSSLGnuTLS : public Module { issl_session* sessions; gnutls_certificate_credentials_t x509_cred; gnutls_dh_params_t dh_params; gnutls_digest_algorithm_t hash; #ifdef GNUTLS_NEW_PRIO_API gnutls_priority_t priority; #endif std::string sslports; int dh_bits; bool cred_alloc; bool dh_alloc; RandGen randhandler; CommandStartTLS starttls; GenericCap capHandler; ServiceProvider iohook; inline static const char* UnknownIfNULL(const char* str) { return str ? str : "UNKNOWN"; } static ssize_t gnutls_pull_wrapper(gnutls_transport_ptr_t session_wrap, void* buffer, size_t size) { issl_session* session = reinterpret_cast(session_wrap); if (session->socket->GetEventMask() & FD_READ_WILL_BLOCK) { #ifdef _WIN32 gnutls_transport_set_errno(session->sess, EAGAIN); #else errno = EAGAIN; #endif return -1; } int rv = ServerInstance->SE->Recv(session->socket, reinterpret_cast(buffer), size, 0); #ifdef _WIN32 if (rv < 0) { /* Windows doesn't use errno, but gnutls does, so check SocketEngine::IgnoreError() * and then set errno appropriately. * The gnutls library may also have a different errno variable than us, see * gnutls_transport_set_errno(3). */ gnutls_transport_set_errno(session->sess, SocketEngine::IgnoreError() ? EAGAIN : errno); } #endif if (rv < (int)size) ServerInstance->SE->ChangeEventMask(session->socket, FD_READ_WILL_BLOCK); return rv; } static ssize_t gnutls_push_wrapper(gnutls_transport_ptr_t session_wrap, const void* buffer, size_t size) { issl_session* session = reinterpret_cast(session_wrap); if (session->socket->GetEventMask() & FD_WRITE_WILL_BLOCK) { #ifdef _WIN32 gnutls_transport_set_errno(session->sess, EAGAIN); #else errno = EAGAIN; #endif return -1; } int rv = ServerInstance->SE->Send(session->socket, reinterpret_cast(buffer), size, 0); #ifdef _WIN32 if (rv < 0) { /* Windows doesn't use errno, but gnutls does, so check SocketEngine::IgnoreError() * and then set errno appropriately. * The gnutls library may also have a different errno variable than us, see * gnutls_transport_set_errno(3). */ gnutls_transport_set_errno(session->sess, SocketEngine::IgnoreError() ? EAGAIN : errno); } #endif if (rv < (int)size) ServerInstance->SE->ChangeEventMask(session->socket, FD_WRITE_WILL_BLOCK); return rv; } public: ModuleSSLGnuTLS() : starttls(this), capHandler(this, "tls"), iohook(this, "ssl/gnutls", SERVICE_IOHOOK) { gcry_control (GCRYCTL_INITIALIZATION_FINISHED, 0); sessions = new issl_session[ServerInstance->SE->GetMaxFds()]; gnutls_global_init(); // This must be called once in the program gnutls_x509_privkey_init(&x509_key); #ifdef GNUTLS_NEW_PRIO_API // Init this here so it's always initialized, avoids an extra boolean gnutls_priority_init(&priority, "NORMAL", NULL); #endif cred_alloc = false; dh_alloc = false; } void init() CXX11_OVERRIDE { // Needs the flag as it ignores a plain /rehash OnModuleRehash(NULL,"ssl"); ServerInstance->GenRandom = &randhandler; // Void return, guess we assume success gnutls_certificate_set_dh_params(x509_cred, dh_params); Implementation eventlist[] = { I_On005Numeric, I_OnRehash, I_OnModuleRehash, I_OnUserConnect, I_OnEvent, I_OnHookIO }; ServerInstance->Modules->Attach(eventlist, this, sizeof(eventlist)/sizeof(Implementation)); ServerInstance->Modules->AddService(iohook); ServerInstance->Modules->AddService(starttls); } void OnRehash(User* user) CXX11_OVERRIDE { sslports.clear(); ConfigTag* Conf = ServerInstance->Config->ConfValue("gnutls"); starttls.enabled = Conf->getBool("starttls", true); if (Conf->getBool("showports", true)) { sslports = Conf->getString("advertisedports"); if (!sslports.empty()) return; for (size_t i = 0; i < ServerInstance->ports.size(); i++) { ListenSocket* port = ServerInstance->ports[i]; if (port->bind_tag->getString("ssl") != "gnutls") continue; const std::string& portid = port->bind_desc; ServerInstance->Logs->Log("m_ssl_gnutls", LOG_DEFAULT, "m_ssl_gnutls.so: Enabling SSL for port %s", portid.c_str()); if (port->bind_tag->getString("type", "clients") == "clients" && port->bind_addr != "127.0.0.1") { /* * Found an SSL port for clients that is not bound to 127.0.0.1 and handled by us, display * the IP:port in ISUPPORT. * * We used to advertise all ports seperated by a ';' char that matched the above criteria, * but this resulted in too long ISUPPORT lines if there were lots of ports to be displayed. * To solve this by default we now only display the first IP:port found and let the user * configure the exact value for the 005 token, if necessary. */ sslports = portid; break; } } } } void OnModuleRehash(User* user, const std::string ¶m) CXX11_OVERRIDE { if(param != "ssl") return; std::string keyfile; std::string certfile; std::string cafile; std::string crlfile; OnRehash(user); ConfigTag* Conf = ServerInstance->Config->ConfValue("gnutls"); cafile = Conf->getString("cafile", CONFIG_PATH "/ca.pem"); crlfile = Conf->getString("crlfile", CONFIG_PATH "/crl.pem"); certfile = Conf->getString("certfile", CONFIG_PATH "/cert.pem"); keyfile = Conf->getString("keyfile", CONFIG_PATH "/key.pem"); dh_bits = Conf->getInt("dhbits"); std::string hashname = Conf->getString("hash", "md5"); // The GnuTLS manual states that the gnutls_set_default_priority() // call we used previously when initializing the session is the same // as setting the "NORMAL" priority string. // Thus if the setting below is not in the config we will behave exactly // the same as before, when the priority setting wasn't available. std::string priorities = Conf->getString("priority", "NORMAL"); if((dh_bits != 768) && (dh_bits != 1024) && (dh_bits != 2048) && (dh_bits != 3072) && (dh_bits != 4096)) dh_bits = 1024; if (hashname == "md5") hash = GNUTLS_DIG_MD5; else if (hashname == "sha1") hash = GNUTLS_DIG_SHA1; else throw ModuleException("Unknown hash type " + hashname); int ret; if (dh_alloc) { gnutls_dh_params_deinit(dh_params); dh_alloc = false; dh_params = NULL; } if (cred_alloc) { // Deallocate the old credentials gnutls_certificate_free_credentials(x509_cred); for(unsigned int i=0; i < x509_certs.size(); i++) gnutls_x509_crt_deinit(x509_certs[i]); x509_certs.clear(); } ret = gnutls_certificate_allocate_credentials(&x509_cred); cred_alloc = (ret >= 0); if (!cred_alloc) ServerInstance->Logs->Log("m_ssl_gnutls", LOG_DEBUG, "m_ssl_gnutls.so: Failed to allocate certificate credentials: %s", gnutls_strerror(ret)); if((ret =gnutls_certificate_set_x509_trust_file(x509_cred, cafile.c_str(), GNUTLS_X509_FMT_PEM)) < 0) ServerInstance->Logs->Log("m_ssl_gnutls", LOG_DEBUG, "m_ssl_gnutls.so: Failed to set X.509 trust file '%s': %s", cafile.c_str(), gnutls_strerror(ret)); if((ret = gnutls_certificate_set_x509_crl_file (x509_cred, crlfile.c_str(), GNUTLS_X509_FMT_PEM)) < 0) ServerInstance->Logs->Log("m_ssl_gnutls", LOG_DEBUG, "m_ssl_gnutls.so: Failed to set X.509 CRL file '%s': %s", crlfile.c_str(), gnutls_strerror(ret)); FileReader reader; reader.Load(certfile); std::string cert_string = reader.GetString(); gnutls_datum_t cert_datum = { (unsigned char*)cert_string.data(), static_cast(cert_string.length()) }; reader.Load(keyfile); std::string key_string = reader.GetString(); gnutls_datum_t key_datum = { (unsigned char*)key_string.data(), static_cast(key_string.length()) }; // If this fails, no SSL port will work. At all. So, do the smart thing - throw a ModuleException unsigned int certcount = 3; x509_certs.resize(certcount); ret = gnutls_x509_crt_list_import(&x509_certs[0], &certcount, &cert_datum, GNUTLS_X509_FMT_PEM, GNUTLS_X509_CRT_LIST_IMPORT_FAIL_IF_EXCEED); if (ret == GNUTLS_E_SHORT_MEMORY_BUFFER) { // the buffer wasn't big enough to hold all certs but gnutls updated certcount to the number of available certs, try again with a bigger buffer x509_certs.resize(certcount); ret = gnutls_x509_crt_list_import(&x509_certs[0], &certcount, &cert_datum, GNUTLS_X509_FMT_PEM, GNUTLS_X509_CRT_LIST_IMPORT_FAIL_IF_EXCEED); } if (ret <= 0) { // clear the vector so we won't call gnutls_x509_crt_deinit() on the (uninited) certs later x509_certs.clear(); throw ModuleException("Unable to load GnuTLS server certificate (" + certfile + "): " + ((ret < 0) ? (std::string(gnutls_strerror(ret))) : "No certs could be read")); } x509_certs.resize(ret); if((ret = gnutls_x509_privkey_import(x509_key, &key_datum, GNUTLS_X509_FMT_PEM)) < 0) throw ModuleException("Unable to load GnuTLS server private key (" + keyfile + "): " + std::string(gnutls_strerror(ret))); if((ret = gnutls_certificate_set_x509_key(x509_cred, &x509_certs[0], certcount, x509_key)) < 0) throw ModuleException("Unable to set GnuTLS cert/key pair: " + std::string(gnutls_strerror(ret))); #ifdef GNUTLS_NEW_PRIO_API // It's safe to call this every time as we cannot have this uninitialized, see constructor and below. gnutls_priority_deinit(priority); // Try to set the priorities for ciphers, kex methods etc. to the user supplied string // If the user did not supply anything then the string is already set to "NORMAL" const char* priocstr = priorities.c_str(); const char* prioerror; if ((ret = gnutls_priority_init(&priority, priocstr, &prioerror)) < 0) { // gnutls did not understand the user supplied string, log and fall back to the default priorities ServerInstance->Logs->Log("m_ssl_gnutls", LOG_DEFAULT, "m_ssl_gnutls.so: Failed to set priorities to \"%s\": %s Syntax error at position %u, falling back to default (NORMAL)", priorities.c_str(), gnutls_strerror(ret), (unsigned int) (prioerror - priocstr)); gnutls_priority_init(&priority, "NORMAL", NULL); } #else if (priorities != "NORMAL") ServerInstance->Logs->Log("m_ssl_gnutls", LOG_DEFAULT, "m_ssl_gnutls.so: You've set to a value other than the default, but this is only supported with GnuTLS v2.1.7 or newer. Your GnuTLS version is older than that so the option will have no effect."); #endif #if(GNUTLS_VERSION_MAJOR < 2 || ( GNUTLS_VERSION_MAJOR == 2 && GNUTLS_VERSION_MINOR < 12 ) ) gnutls_certificate_client_set_retrieve_function (x509_cred, cert_callback); #else gnutls_certificate_set_retrieve_function (x509_cred, cert_callback); #endif ret = gnutls_dh_params_init(&dh_params); dh_alloc = (ret >= 0); if (!dh_alloc) { ServerInstance->Logs->Log("m_ssl_gnutls", LOG_DEFAULT, "m_ssl_gnutls.so: Failed to initialise DH parameters: %s", gnutls_strerror(ret)); return; } std::string dhfile = Conf->getString("dhfile"); if (!dhfile.empty()) { // Try to load DH params from file reader.Load(dhfile); std::string dhstring = reader.GetString(); gnutls_datum_t dh_datum = { (unsigned char*)dhstring.data(), static_cast(dhstring.length()) }; if ((ret = gnutls_dh_params_import_pkcs3(dh_params, &dh_datum, GNUTLS_X509_FMT_PEM)) < 0) { // File unreadable or GnuTLS was unhappy with the contents, generate the DH primes now ServerInstance->Logs->Log("m_ssl_gnutls", LOG_DEFAULT, "m_ssl_gnutls.so: Generating DH parameters because I failed to load them from file '%s': %s", dhfile.c_str(), gnutls_strerror(ret)); GenerateDHParams(); } } else { GenerateDHParams(); } } void GenerateDHParams() { // 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 (!dh_alloc) return; int ret; if((ret = gnutls_dh_params_generate2(dh_params, dh_bits)) < 0) ServerInstance->Logs->Log("m_ssl_gnutls", LOG_DEFAULT, "m_ssl_gnutls.so: Failed to generate DH parameters (%d bits): %s", dh_bits, gnutls_strerror(ret)); } ~ModuleSSLGnuTLS() { for(unsigned int i=0; i < x509_certs.size(); i++) gnutls_x509_crt_deinit(x509_certs[i]); gnutls_x509_privkey_deinit(x509_key); #ifdef GNUTLS_NEW_PRIO_API gnutls_priority_deinit(priority); #endif if (dh_alloc) gnutls_dh_params_deinit(dh_params); if (cred_alloc) gnutls_certificate_free_credentials(x509_cred); gnutls_global_deinit(); delete[] sessions; ServerInstance->GenRandom = &ServerInstance->HandleGenRandom; } void OnCleanup(int target_type, void* item) CXX11_OVERRIDE { if(target_type == TYPE_USER) { LocalUser* user = IS_LOCAL(static_cast(item)); if (user && user->eh.GetIOHook() == this) { // User is using SSL, they're a local user, and they're using one of *our* SSL ports. // Potentially there could be multiple SSL modules loaded at once on different ports. ServerInstance->Users->QuitUser(user, "SSL module unloading"); } } } Version GetVersion() CXX11_OVERRIDE { return Version("Provides SSL support for clients", VF_VENDOR); } void On005Numeric(std::map& tokens) CXX11_OVERRIDE { if (!sslports.empty()) tokens["SSL"] = sslports; if (starttls.enabled) tokens["STARTTLS"]; } void OnHookIO(StreamSocket* user, ListenSocket* lsb) CXX11_OVERRIDE { if (!user->GetIOHook() && lsb->bind_tag->getString("ssl") == "gnutls") { /* Hook the user with our module */ user->AddIOHook(this); } } void OnRequest(Request& request) CXX11_OVERRIDE { if (strcmp("GET_SSL_CERT", request.id) == 0) { SocketCertificateRequest& req = static_cast(request); int fd = req.sock->GetFd(); issl_session* session = &sessions[fd]; req.cert = session->cert; } } void InitSession(StreamSocket* user, bool me_server) { issl_session* session = &sessions[user->GetFd()]; gnutls_init(&session->sess, me_server ? GNUTLS_SERVER : GNUTLS_CLIENT); session->socket = user; #ifdef GNUTLS_NEW_PRIO_API gnutls_priority_set(session->sess, priority); #endif gnutls_credentials_set(session->sess, GNUTLS_CRD_CERTIFICATE, x509_cred); gnutls_dh_set_prime_bits(session->sess, dh_bits); gnutls_transport_set_ptr(session->sess, reinterpret_cast(session)); gnutls_transport_set_push_function(session->sess, gnutls_push_wrapper); gnutls_transport_set_pull_function(session->sess, gnutls_pull_wrapper); if (me_server) gnutls_certificate_server_set_request(session->sess, GNUTLS_CERT_REQUEST); // Request client certificate if any. Handshake(session, user); } void OnStreamSocketAccept(StreamSocket* user, irc::sockets::sockaddrs* client, irc::sockets::sockaddrs* server) CXX11_OVERRIDE { issl_session* session = &sessions[user->GetFd()]; /* For STARTTLS: Don't try and init a session on a socket that already has a session */ if (session->sess) return; InitSession(user, true); } void OnStreamSocketConnect(StreamSocket* user) CXX11_OVERRIDE { InitSession(user, false); } void OnStreamSocketClose(StreamSocket* user) CXX11_OVERRIDE { CloseSession(&sessions[user->GetFd()]); } int OnStreamSocketRead(StreamSocket* user, std::string& recvq) CXX11_OVERRIDE { issl_session* session = &sessions[user->GetFd()]; if (!session->sess) { CloseSession(session); user->SetError("No SSL session"); return -1; } if (session->status == ISSL_HANDSHAKING_READ || session->status == ISSL_HANDSHAKING_WRITE) { // The handshake isn't finished, try to finish it. if(!Handshake(session, user)) { if (session->status != ISSL_CLOSING) return 0; return -1; } } // If we resumed the handshake then session->status will be ISSL_HANDSHAKEN. if (session->status == ISSL_HANDSHAKEN) { char* buffer = ServerInstance->GetReadBuffer(); size_t bufsiz = ServerInstance->Config->NetBufferSize; int ret = gnutls_record_recv(session->sess, buffer, bufsiz); if (ret > 0) { recvq.append(buffer, ret); return 1; } else if (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED) { return 0; } else if (ret == 0) { user->SetError("Connection closed"); CloseSession(session); return -1; } else { user->SetError(gnutls_strerror(ret)); CloseSession(session); return -1; } } else if (session->status == ISSL_CLOSING) return -1; return 0; } int OnStreamSocketWrite(StreamSocket* user, std::string& sendq) CXX11_OVERRIDE { issl_session* session = &sessions[user->GetFd()]; if (!session->sess) { CloseSession(session); user->SetError("No SSL session"); return -1; } if (session->status == ISSL_HANDSHAKING_WRITE || session->status == ISSL_HANDSHAKING_READ) { // The handshake isn't finished, try to finish it. Handshake(session, user); if (session->status != ISSL_CLOSING) return 0; return -1; } int ret = 0; if (session->status == ISSL_HANDSHAKEN) { ret = gnutls_record_send(session->sess, sendq.data(), sendq.length()); if (ret == (int)sendq.length()) { ServerInstance->SE->ChangeEventMask(user, FD_WANT_NO_WRITE); return 1; } else if (ret > 0) { sendq = sendq.substr(ret); ServerInstance->SE->ChangeEventMask(user, FD_WANT_SINGLE_WRITE); return 0; } else if (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED || ret == 0) { ServerInstance->SE->ChangeEventMask(user, FD_WANT_SINGLE_WRITE); return 0; } else // (ret < 0) { user->SetError(gnutls_strerror(ret)); CloseSession(session); return -1; } } return 0; } bool Handshake(issl_session* session, StreamSocket* user) { 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; ServerInstance->SE->ChangeEventMask(user, FD_WANT_POLL_READ | FD_WANT_NO_WRITE); } else { // gnutls_handshake() wants to write() again. session->status = ISSL_HANDSHAKING_WRITE; ServerInstance->SE->ChangeEventMask(user, FD_WANT_NO_READ | FD_WANT_SINGLE_WRITE); } } else { user->SetError("Handshake Failed - " + std::string(gnutls_strerror(ret))); CloseSession(session); session->status = ISSL_CLOSING; } return false; } else { // Change the seesion state session->status = ISSL_HANDSHAKEN; VerifyCertificate(session,user); // Finish writing, if any left ServerInstance->SE->ChangeEventMask(user, FD_WANT_POLL_READ | FD_WANT_NO_WRITE | FD_ADD_TRIAL_WRITE); return true; } } void OnUserConnect(LocalUser* user) CXX11_OVERRIDE { if (user->eh.GetIOHook() == this) { if (sessions[user->eh.GetFd()].sess) { const gnutls_session_t& sess = sessions[user->eh.GetFd()].sess; std::string cipher = UnknownIfNULL(gnutls_kx_get_name(gnutls_kx_get(sess))); cipher.append("-").append(UnknownIfNULL(gnutls_cipher_get_name(gnutls_cipher_get(sess)))).append("-"); cipher.append(UnknownIfNULL(gnutls_mac_get_name(gnutls_mac_get(sess)))); ssl_cert* cert = sessions[user->eh.GetFd()].cert; if (cert->fingerprint.empty()) user->WriteNotice("*** You are connected using SSL cipher '" + cipher + "'"); else user->WriteNotice("*** You are connected using SSL cipher '" + cipher + "' and your SSL fingerprint is " + cert->fingerprint); } } } void CloseSession(issl_session* session) { if (session->sess) { gnutls_bye(session->sess, GNUTLS_SHUT_WR); gnutls_deinit(session->sess); } session->socket = NULL; session->sess = NULL; session->cert = NULL; session->status = ISSL_NONE; } void VerifyCertificate(issl_session* session, StreamSocket* user) { if (!session->sess || !user) return; unsigned int status; const gnutls_datum_t* cert_list; int ret; unsigned int cert_list_size; gnutls_x509_crt_t cert; char name[512]; unsigned char digest[512]; size_t digest_size = sizeof(digest); size_t name_size = sizeof(name); ssl_cert* certinfo = new ssl_cert; session->cert = certinfo; /* This verification function uses the trusted CAs in the credentials * structure. So you must have installed one or more CA certificates. */ ret = gnutls_certificate_verify_peers2(session->sess, &status); if (ret < 0) { certinfo->error = std::string(gnutls_strerror(ret)); return; } certinfo->invalid = (status & GNUTLS_CERT_INVALID); certinfo->unknownsigner = (status & GNUTLS_CERT_SIGNER_NOT_FOUND); certinfo->revoked = (status & GNUTLS_CERT_REVOKED); certinfo->trusted = !(status & GNUTLS_CERT_SIGNER_NOT_CA); /* Up to here the process is the same for X.509 certificates and * OpenPGP keys. From now on X.509 certificates are assumed. This can * be easily extended to work with openpgp keys as well. */ if (gnutls_certificate_type_get(session->sess) != GNUTLS_CRT_X509) { certinfo->error = "No X509 keys sent"; return; } ret = gnutls_x509_crt_init(&cert); if (ret < 0) { certinfo->error = gnutls_strerror(ret); return; } cert_list_size = 0; cert_list = gnutls_certificate_get_peers(session->sess, &cert_list_size); if (cert_list == NULL) { certinfo->error = "No certificate was found"; goto info_done_dealloc; } /* This is not a real world example, since we only check the first * certificate in the given chain. */ ret = gnutls_x509_crt_import(cert, &cert_list[0], GNUTLS_X509_FMT_DER); if (ret < 0) { certinfo->error = gnutls_strerror(ret); goto info_done_dealloc; } gnutls_x509_crt_get_dn(cert, name, &name_size); certinfo->dn = name; gnutls_x509_crt_get_issuer_dn(cert, name, &name_size); certinfo->issuer = name; if ((ret = gnutls_x509_crt_get_fingerprint(cert, hash, digest, &digest_size)) < 0) { certinfo->error = gnutls_strerror(ret); } else { certinfo->fingerprint = BinToHex(digest, digest_size); } /* Beware here we do not check for errors. */ if ((gnutls_x509_crt_get_expiration_time(cert) < ServerInstance->Time()) || (gnutls_x509_crt_get_activation_time(cert) > ServerInstance->Time())) { certinfo->error = "Not activated, or expired certificate"; } info_done_dealloc: gnutls_x509_crt_deinit(cert); } void OnEvent(Event& ev) CXX11_OVERRIDE { if (starttls.enabled) capHandler.HandleEvent(ev); } }; MODULE_INIT(ModuleSSLGnuTLS)