/* * InspIRCd -- Internet Relay Chat Daemon * * Copyright (C) 2009-2010 Daniel De Graaf * Copyright (C) 2008 Pippijn van Steenhoven * Copyright (C) 2006-2008 Craig Edwards * Copyright (C) 2008 Thomas Stagner * 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 . */ /* HACK: This prevents OpenSSL on OS X 10.7 and later from spewing deprecation * warnings for every single function call. As far as I (SaberUK) know, Apple * have no plans to remove OpenSSL so this warning just causes needless spam. */ #ifdef __APPLE__ # define __AVAILABILITYMACROS__ # define DEPRECATED_IN_MAC_OS_X_VERSION_10_7_AND_LATER #endif #include "inspircd.h" #include #include #include "ssl.h" #ifdef _WIN32 # pragma comment(lib, "libcrypto.lib") # pragma comment(lib, "libssl.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") # 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") */ /* $NoPedantic */ 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: SSL* sess; issl_status status; reference cert; 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 { issl_session* sessions; SSL_CTX* ctx; SSL_CTX* clictx; std::string sslports; bool use_sha; ServiceProvider iohook; public: ModuleSSLOpenSSL() : iohook(this, "ssl/openssl", SERVICE_IOHOOK) { sessions = new issl_session[ServerInstance->SE->GetMaxFds()]; /* 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); } void init() { // Needs the flag as it ignores a plain /rehash OnModuleRehash(NULL,"ssl"); Implementation eventlist[] = { I_On005Numeric, I_OnRehash, I_OnModuleRehash, I_OnHookIO, I_OnUserConnect }; ServerInstance->Modules->Attach(eventlist, this, sizeof(eventlist)/sizeof(Implementation)); ServerInstance->Modules->AddService(iohook); } void OnHookIO(StreamSocket* user, ListenSocket* lsb) { if (!user->GetIOHook() && lsb->bind_tag->getString("ssl") == "openssl") { /* Hook the user with our module */ user->AddIOHook(this); } } void OnRehash(User* user) { sslports.clear(); ConfigTag* Conf = ServerInstance->Config->ConfValue("openssl"); 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") != "openssl") continue; const std::string& portid = port->bind_desc; ServerInstance->Logs->Log("m_ssl_openssl", DEFAULT, "m_ssl_openssl.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) { if (param != "ssl") return; std::string keyfile; std::string certfile; std::string cafile; std::string dhfile; OnRehash(user); ConfigTag* conf = ServerInstance->Config->ConfValue("openssl"); cafile = conf->getString("cafile", CONFIG_PATH "/ca.pem"); certfile = conf->getString("certfile", CONFIG_PATH "/cert.pem"); keyfile = conf->getString("keyfile", CONFIG_PATH "/key.pem"); dhfile = conf->getString("dhfile", CONFIG_PATH "/dhparams.pem"); std::string hash = conf->getString("hash", "md5"); if (hash != "sha1" && hash != "md5") throw ModuleException("Unknown hash type " + hash); use_sha = (hash == "sha1"); std::string ciphers = conf->getString("ciphers", ""); if (!ciphers.empty()) { if ((!SSL_CTX_set_cipher_list(ctx, ciphers.c_str())) || (!SSL_CTX_set_cipher_list(clictx, ciphers.c_str()))) { ServerInstance->Logs->Log("m_ssl_openssl",DEFAULT, "m_ssl_openssl.so: Can't set cipher list to %s.", ciphers.c_str()); ERR_print_errors_cb(error_callback, this); } } /* 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. This is only a problem if you want to verify client certificates, otherwise it's safe to ignore this message. Error: %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); delete[] sessions; } void OnUserConnect(LocalUser* user) { if (user->eh.GetIOHook() == this) { if (sessions[user->eh.GetFd()].sess) { if (!sessions[user->eh.GetFd()].cert->fingerprint.empty()) user->WriteServ("NOTICE %s :*** You are connected using SSL cipher \"%s\"" " and your SSL fingerprint is %s", user->nick.c_str(), SSL_get_cipher(sessions[user->eh.GetFd()].sess), sessions[user->eh.GetFd()].cert->fingerprint.c_str()); else user->WriteServ("NOTICE %s :*** You are connected using SSL cipher \"%s\"", user->nick.c_str(), SSL_get_cipher(sessions[user->eh.GetFd()].sess)); } } } void OnCleanup(int target_type, void* item) { if (target_type == TYPE_USER) { LocalUser* user = IS_LOCAL((User*)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() { return Version("Provides SSL support for clients", VF_VENDOR); } void OnRequest(Request& request) { 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 OnStreamSocketAccept(StreamSocket* user, irc::sockets::sockaddrs* client, irc::sockets::sockaddrs* server) { int fd = user->GetFd(); issl_session* session = &sessions[fd]; session->sess = SSL_new(ctx); session->status = ISSL_NONE; session->outbound = false; session->cert = NULL; 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->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); if (session->data_to_write) ServerInstance->SE->ChangeEventMask(user, FD_WANT_POLL_READ | FD_WANT_SINGLE_WRITE); return 1; } else if (ret == 0) { // Client closed connection. CloseSession(session); user->SetError("Connection closed"); 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); return 0; } else { CloseSession(session); return -1; } } } return 0; } bool Handshake(StreamSocket* 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, StreamSocket* user) { if (!session->sess || !user) return; X509* cert; ssl_cert* certinfo = new ssl_cert; session->cert = certinfo; unsigned int n; unsigned char md[EVP_MAX_MD_SIZE]; const EVP_MD *digest = use_sha ? EVP_sha1() : EVP_md5(); cert = SSL_get_peer_certificate((SSL*)session->sess); if (!cert) { certinfo->error = "Could not get peer certificate: "+std::string(get_error()); 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); } }; 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)