/* +------------------------------------+ * | 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" #include #include #include "transport.h" #ifdef WINDOWS #pragma comment(lib, "libeay32MTd") #pragma comment(lib, "ssleay32MTd") #undef MAX_DESCRIPTORS #define MAX_DESCRIPTORS 10000 #endif /* $ModDesc: Provides SSL support for clients */ /* $LinkerFlags: if("USE_FREEBSD_BASE_SSL") -lssl -lcrypto */ /* $CompileFlags: if(!"USE_FREEBSD_BASE_SSL") pkgconfversion("openssl","0.9.7") pkgconfincludes("openssl","/openssl/ssl.h","") */ /* $LinkerFlags: if(!"USE_FREEBSD_BASE_SSL") rpath("pkg-config --libs openssl") pkgconflibs("openssl","/libssl.so","-lssl -lcrypto -ldl") */ /* $ModDep: transport.h */ /* $NoPedantic */ /* $CopyInstall: conf/key.pem $(CONPATH) */ /* $CopyInstall: conf/cert.pem $(CONPATH) */ enum issl_status { ISSL_NONE, ISSL_HANDSHAKING, ISSL_OPEN }; static bool SelfSigned = false; char* get_error() { return ERR_error_string(ERR_get_error(), NULL); } static int error_callback(const char *str, size_t len, void *u); /** Represents an SSL user's extra data */ class issl_session : public classbase { public: SSL* sess; issl_status status; int fd; bool outbound; bool data_to_write; issl_session() { outbound = false; data_to_write = false; } }; static int OnVerify(int preverify_ok, X509_STORE_CTX *ctx) { /* XXX: This will allow self signed certificates. * In the future if we want an option to not allow this, * we can just return preverify_ok here, and openssl * will boot off self-signed and invalid peer certs. */ int ve = X509_STORE_CTX_get_error(ctx); SelfSigned = (ve == X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT); return 1; } class ModuleSSLOpenSSL : public Module { std::set listenports; int inbufsize; issl_session* sessions; SSL_CTX* ctx; SSL_CTX* clictx; char cipher[MAXBUF]; std::string keyfile; std::string certfile; std::string cafile; // std::string crlfile; std::string dhfile; std::string sslports; public: ModuleSSLOpenSSL() { ServerInstance->Modules->PublishInterface("BufferedSocketHook", this); sessions = new issl_session[ServerInstance->SE->GetMaxFds()]; // Not rehashable...because I cba to reduce all the sizes of existing buffers. inbufsize = ServerInstance->Config->NetBufferSize; /* Global SSL library initialization*/ SSL_library_init(); SSL_load_error_strings(); /* Build our SSL contexts: * NOTE: OpenSSL makes us have two contexts, one for servers and one for clients. ICK. */ ctx = SSL_CTX_new( SSLv23_server_method() ); clictx = SSL_CTX_new( SSLv23_client_method() ); SSL_CTX_set_mode(ctx, SSL_MODE_ENABLE_PARTIAL_WRITE | SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER); SSL_CTX_set_mode(clictx, SSL_MODE_ENABLE_PARTIAL_WRITE | SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER); SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER | SSL_VERIFY_CLIENT_ONCE, OnVerify); SSL_CTX_set_verify(clictx, SSL_VERIFY_PEER | SSL_VERIFY_CLIENT_ONCE, OnVerify); // Needs the flag as it ignores a plain /rehash OnModuleRehash(NULL,"ssl"); Implementation eventlist[] = { I_On005Numeric, I_OnRequest, I_OnRehash, I_OnModuleRehash, I_OnPostConnect, I_OnHookIO }; ServerInstance->Modules->Attach(eventlist, this, sizeof(eventlist)/sizeof(Implementation)); } void OnHookIO(StreamSocket* user, ListenSocketBase* lsb) { if (!user->GetIOHook() && listenports.find(lsb) != listenports.end()) { /* Hook the user with our module */ user->AddIOHook(this); } } void OnRehash(User* user) { ConfigReader Conf; listenports.clear(); sslports.clear(); for (size_t i = 0; i < ServerInstance->ports.size(); i++) { ListenSocketBase* port = ServerInstance->ports[i]; std::string desc = port->GetDescription(); if (desc != "openssl") continue; listenports.insert(port); std::string portid = port->GetBindDesc(); ServerInstance->Logs->Log("m_ssl_openssl", DEFAULT, "m_ssl_openssl.so: Enabling SSL for port %s", portid.c_str()); if (port->GetIP() != "127.0.0.1") sslports.append(portid).append(";"); } if (!sslports.empty()) sslports.erase(sslports.end() - 1); } void OnModuleRehash(User* user, const std::string ¶m) { if (param != "ssl") return; OnRehash(user); ConfigReader Conf; std::string confdir(ServerInstance->ConfigFileName); // +1 so we the path ends with a / confdir = confdir.substr(0, confdir.find_last_of('/') + 1); cafile = Conf.ReadValue("openssl", "cafile", 0); certfile = Conf.ReadValue("openssl", "certfile", 0); keyfile = Conf.ReadValue("openssl", "keyfile", 0); dhfile = Conf.ReadValue("openssl", "dhfile", 0); // Set all the default values needed. if (cafile.empty()) cafile = "ca.pem"; if (certfile.empty()) certfile = "cert.pem"; if (keyfile.empty()) keyfile = "key.pem"; if (dhfile.empty()) dhfile = "dhparams.pem"; // Prepend relative paths with the path to the config directory. if ((cafile[0] != '/') && (!ServerInstance->Config->StartsWithWindowsDriveLetter(cafile))) cafile = confdir + cafile; if ((certfile[0] != '/') && (!ServerInstance->Config->StartsWithWindowsDriveLetter(certfile))) certfile = confdir + certfile; if ((keyfile[0] != '/') && (!ServerInstance->Config->StartsWithWindowsDriveLetter(keyfile))) keyfile = confdir + keyfile; if ((dhfile[0] != '/') && (!ServerInstance->Config->StartsWithWindowsDriveLetter(dhfile))) dhfile = confdir + dhfile; /* Load our keys and certificates * NOTE: OpenSSL's error logging API sucks, don't blame us for this clusterfuck. */ if ((!SSL_CTX_use_certificate_chain_file(ctx, certfile.c_str())) || (!SSL_CTX_use_certificate_chain_file(clictx, certfile.c_str()))) { ServerInstance->Logs->Log("m_ssl_openssl",DEFAULT, "m_ssl_openssl.so: Can't read certificate file %s. %s", certfile.c_str(), strerror(errno)); ERR_print_errors_cb(error_callback, this); } if (((!SSL_CTX_use_PrivateKey_file(ctx, keyfile.c_str(), SSL_FILETYPE_PEM))) || (!SSL_CTX_use_PrivateKey_file(clictx, keyfile.c_str(), SSL_FILETYPE_PEM))) { ServerInstance->Logs->Log("m_ssl_openssl",DEFAULT, "m_ssl_openssl.so: Can't read key file %s. %s", keyfile.c_str(), strerror(errno)); ERR_print_errors_cb(error_callback, this); } /* Load the CAs we trust*/ if (((!SSL_CTX_load_verify_locations(ctx, cafile.c_str(), 0))) || (!SSL_CTX_load_verify_locations(clictx, cafile.c_str(), 0))) { ServerInstance->Logs->Log("m_ssl_openssl",DEFAULT, "m_ssl_openssl.so: Can't read CA list from %s. %s", cafile.c_str(), strerror(errno)); ERR_print_errors_cb(error_callback, this); } FILE* dhpfile = fopen(dhfile.c_str(), "r"); DH* ret; if (dhpfile == NULL) { ServerInstance->Logs->Log("m_ssl_openssl",DEFAULT, "m_ssl_openssl.so Couldn't open DH file %s: %s", dhfile.c_str(), strerror(errno)); throw ModuleException("Couldn't open DH file " + dhfile + ": " + strerror(errno)); } else { ret = PEM_read_DHparams(dhpfile, NULL, NULL, NULL); if ((SSL_CTX_set_tmp_dh(ctx, ret) < 0) || (SSL_CTX_set_tmp_dh(clictx, ret) < 0)) { ServerInstance->Logs->Log("m_ssl_openssl",DEFAULT, "m_ssl_openssl.so: Couldn't set DH parameters %s. SSL errors follow:", dhfile.c_str()); ERR_print_errors_cb(error_callback, this); } } fclose(dhpfile); } void On005Numeric(std::string &output) { if (!sslports.empty()) output.append(" SSL=" + sslports); } ~ModuleSSLOpenSSL() { SSL_CTX_free(ctx); SSL_CTX_free(clictx); ServerInstance->Modules->UnpublishInterface("BufferedSocketHook", this); delete[] sessions; } void OnCleanup(int target_type, void* item) { if (target_type == TYPE_USER) { User* user = (User*)item; if (user->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"); user->DelIOHook(); } } } Version GetVersion() { return Version("Provides SSL support for clients", VF_VENDOR, API_VERSION); } const char* OnRequest(Request* request) { ISHRequest* ISR = (ISHRequest*)request; if (strcmp("IS_NAME", request->GetId()) == 0) { return "openssl"; } else if (strcmp("IS_HOOK", request->GetId()) == 0) { ISR->Sock->AddIOHook(this); return "OK"; } else if (strcmp("IS_UNHOOK", request->GetId()) == 0) { ISR->Sock->DelIOHook(); return "OK"; } else if (strcmp("IS_HSDONE", request->GetId()) == 0) { if (ISR->Sock->GetFd() < 0) return "OK"; issl_session* session = &sessions[ISR->Sock->GetFd()]; return (session->status == ISSL_HANDSHAKING) ? NULL : "OK"; } else if (strcmp("IS_ATTACH", request->GetId()) == 0) { issl_session* session = &sessions[ISR->Sock->GetFd()]; if (session->sess) { return "OK"; } } else if (strcmp("GET_CERT", request->GetId()) == 0) { Module* sslinfo = ServerInstance->Modules->Find("m_sslinfo.so"); if (sslinfo) return sslinfo->OnRequest(request); } return NULL; } void OnStreamSocketAccept(StreamSocket* user, irc::sockets::sockaddrs* client, irc::sockets::sockaddrs* server) { int fd = user->GetFd(); issl_session* session = &sessions[fd]; session->fd = fd; session->sess = SSL_new(ctx); session->status = ISSL_NONE; session->outbound = false; if (session->sess == NULL) return; if (SSL_set_fd(session->sess, fd) == 0) { ServerInstance->Logs->Log("m_ssl_openssl",DEBUG,"BUG: Can't set fd with SSL_set_fd: %d", fd); return; } Handshake(user, session); } void OnStreamSocketConnect(StreamSocket* user) { int fd = user->GetFd(); /* Are there any possibilities of an out of range fd? Hope not, but lets be paranoid */ if ((fd < 0) || (fd > ServerInstance->SE->GetMaxFds() -1)) return; issl_session* session = &sessions[fd]; session->fd = fd; session->sess = SSL_new(clictx); session->status = ISSL_NONE; session->outbound = true; if (session->sess == NULL) return; if (SSL_set_fd(session->sess, fd) == 0) { ServerInstance->Logs->Log("m_ssl_openssl",DEBUG,"BUG: Can't set fd with SSL_set_fd: %d", fd); return; } Handshake(user, session); } void OnStreamSocketClose(StreamSocket* user) { int fd = user->GetFd(); /* Are there any possibilities of an out of range fd? Hope not, but lets be paranoid */ if ((fd < 0) || (fd > ServerInstance->SE->GetMaxFds() - 1)) return; CloseSession(&sessions[fd]); } int OnStreamSocketRead(StreamSocket* user, std::string& recvq) { int fd = user->GetFd(); /* Are there any possibilities of an out of range fd? Hope not, but lets be paranoid */ if ((fd < 0) || (fd > ServerInstance->SE->GetMaxFds() - 1)) return -1; issl_session* session = &sessions[fd]; if (!session->sess) { CloseSession(session); return -1; } if (session->status == ISSL_HANDSHAKING) { // The handshake isn't finished and it wants to read, try to finish it. if (!Handshake(user, session)) { // Couldn't resume handshake. if (session->status == ISSL_NONE) return -1; return 0; } } // If we resumed the handshake then session->status will be ISSL_OPEN if (session->status == ISSL_OPEN) { char* buffer = ServerInstance->GetReadBuffer(); size_t bufsiz = ServerInstance->Config->NetBufferSize; int ret = SSL_read(session->sess, buffer, bufsiz); if (ret > 0) { recvq.append(buffer, ret); return 1; } else if (ret == 0) { // Client closed connection. CloseSession(session); return -1; } else if (ret < 0) { int err = SSL_get_error(session->sess, ret); if (err == SSL_ERROR_WANT_READ) { ServerInstance->SE->ChangeEventMask(user, FD_WANT_POLL_READ); return 0; } else if (err == SSL_ERROR_WANT_WRITE) { ServerInstance->SE->ChangeEventMask(user, FD_WANT_NO_READ | FD_WANT_SINGLE_WRITE); return 0; } else { CloseSession(session); return -1; } } } return 0; } int OnStreamSocketWrite(StreamSocket* user, std::string& buffer) { int fd = user->GetFd(); issl_session* session = &sessions[fd]; if (!session->sess) { CloseSession(session); return -1; } session->data_to_write = true; if (session->status == ISSL_HANDSHAKING) { if (!Handshake(user, session)) { // Couldn't resume handshake. if (session->status == ISSL_NONE) return -1; return 0; } } if (session->status == ISSL_OPEN) { int ret = SSL_write(session->sess, buffer.data(), buffer.size()); if (ret == (int)buffer.length()) { session->data_to_write = false; ServerInstance->SE->ChangeEventMask(user, FD_WANT_POLL_READ | FD_WANT_NO_WRITE); return 1; } else if (ret > 0) { buffer = buffer.substr(ret); ServerInstance->SE->ChangeEventMask(user, FD_WANT_SINGLE_WRITE); return 0; } else if (ret == 0) { CloseSession(session); return -1; } else if (ret < 0) { int err = SSL_get_error(session->sess, ret); if (err == SSL_ERROR_WANT_WRITE) { ServerInstance->SE->ChangeEventMask(user, FD_WANT_SINGLE_WRITE); return 0; } else if (err == SSL_ERROR_WANT_READ) { ServerInstance->SE->ChangeEventMask(user, FD_WANT_POLL_READ | FD_WANT_NO_WRITE); return 0; } else { CloseSession(session); return -1; } } } return 0; } bool Handshake(EventHandler* user, issl_session* session) { int ret; if (session->outbound) ret = SSL_connect(session->sess); else ret = SSL_accept(session->sess); if (ret < 0) { int err = SSL_get_error(session->sess, ret); if (err == SSL_ERROR_WANT_READ) { ServerInstance->SE->ChangeEventMask(user, FD_WANT_POLL_READ | FD_WANT_NO_WRITE); session->status = ISSL_HANDSHAKING; return true; } else if (err == SSL_ERROR_WANT_WRITE) { ServerInstance->SE->ChangeEventMask(user, FD_WANT_NO_READ | FD_WANT_SINGLE_WRITE); session->status = ISSL_HANDSHAKING; return true; } else { CloseSession(session); } return false; } else if (ret > 0) { // Handshake complete. VerifyCertificate(session, user); session->status = ISSL_OPEN; ServerInstance->SE->ChangeEventMask(user, FD_WANT_POLL_READ | FD_WANT_NO_WRITE | FD_ADD_TRIAL_WRITE); return true; } else if (ret == 0) { CloseSession(session); return true; } return true; } void CloseSession(issl_session* session) { if (session->sess) { SSL_shutdown(session->sess); SSL_free(session->sess); } session->sess = NULL; session->status = ISSL_NONE; errno = EIO; } void VerifyCertificate(issl_session* session, Extensible* user) { if (!session->sess || !user) return; Module* sslinfo = ServerInstance->Modules->Find("m_sslinfo.so"); if (!sslinfo) return; X509* cert; ssl_cert* certinfo = new ssl_cert; unsigned int n; unsigned char md[EVP_MAX_MD_SIZE]; const EVP_MD *digest = EVP_md5(); cert = SSL_get_peer_certificate((SSL*)session->sess); if (!cert) { certinfo->error = "Could not get peer certificate: "+std::string(get_error()); BufferedSocketFingerprintSubmission(user, this, sslinfo, certinfo).Send(); return; } certinfo->invalid = (SSL_get_verify_result(session->sess) != X509_V_OK); if (SelfSigned) { certinfo->unknownsigner = false; certinfo->trusted = true; } else { certinfo->unknownsigner = true; certinfo->trusted = false; } certinfo->dn = X509_NAME_oneline(X509_get_subject_name(cert),0,0); certinfo->issuer = X509_NAME_oneline(X509_get_issuer_name(cert),0,0); if (!X509_digest(cert, digest, md, &n)) { certinfo->error = "Out of memory generating fingerprint"; } else { certinfo->fingerprint = irc::hex(md, n); } if ((ASN1_UTCTIME_cmp_time_t(X509_get_notAfter(cert), ServerInstance->Time()) == -1) || (ASN1_UTCTIME_cmp_time_t(X509_get_notBefore(cert), ServerInstance->Time()) == 0)) { certinfo->error = "Not activated, or expired certificate"; } X509_free(cert); BufferedSocketFingerprintSubmission(user, this, sslinfo, certinfo).Send(); } void Prioritize() { Module* server = ServerInstance->Modules->Find("m_spanningtree.so"); ServerInstance->Modules->SetPriority(this, I_OnPostConnect, PRIORITY_AFTER, &server); } }; static int error_callback(const char *str, size_t len, void *u) { ServerInstance->Logs->Log("m_ssl_openssl",DEFAULT, "SSL error: " + std::string(str, len - 1)); // // XXX: Remove this line, it causes valgrind warnings... // // MD_update(&m, buf, j); // // // ... ONLY JOKING! :-) // return 0; } MODULE_INIT(ModuleSSLOpenSSL)