src/modules/extra/m_ssl_openssl.cpp

   1 /*
   2  * InspIRCd -- Internet Relay Chat Daemon
   3  *
   4  *   Copyright (C) 2009-2010 Daniel De Graaf <danieldg@inspircd.org>
   5  *   Copyright (C) 2008 Pippijn van Steenhoven <pip88nl@gmail.com>
   6  *   Copyright (C) 2006-2008 Craig Edwards <craigedwards@brainbox.cc>
   7  *   Copyright (C) 2008 Thomas Stagner <aquanight@inspircd.org>
   8  *   Copyright (C) 2007 Dennis Friis <peavey@inspircd.org>
   9  *   Copyright (C) 2006 Oliver Lupton <oliverlupton@gmail.com>
  10  *
  11  * This file is part of InspIRCd.  InspIRCd is free software: you can
  12  * redistribute it and/or modify it under the terms of the GNU General Public
  13  * License as published by the Free Software Foundation, version 2.
  14  *
  15  * This program is distributed in the hope that it will be useful, but WITHOUT
  16  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  17  * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
  18  * details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  22  */
  23
  24
  25 #include "inspircd.h"
  26 #include "iohook.h"
  27 #include "modules/ssl.h"
  28
  29 // Ignore OpenSSL deprecation warnings on OS X Lion and newer.
  30 #if defined __APPLE__
  31 # pragma GCC diagnostic ignored "-Wdeprecated-declarations"
  32 #endif
  33
  34 // Fix warnings about the use of `long long` on C++03.
  35 #if defined __clang__
  36 # pragma clang diagnostic ignored "-Wc++11-long-long"
  37 #elif defined __GNUC__
  38 # pragma GCC diagnostic ignored "-Wlong-long"
  39 #endif
  40
  41 #include <openssl/ssl.h>
  42 #include <openssl/err.h>
  43
  44 #ifdef _WIN32
  45 # pragma comment(lib, "ssleay32.lib")
  46 # pragma comment(lib, "libeay32.lib")
  47 #endif
  48
  49 /* $CompileFlags: pkgconfversion("openssl","0.9.7") pkgconfincludes("openssl","/openssl/ssl.h","") */
  50 /* $LinkerFlags: rpath("pkg-config --libs openssl") pkgconflibs("openssl","/libssl.so","-lssl -lcrypto") */
  51
  52 #if ((OPENSSL_VERSION_NUMBER >= 0x10000000L) && (!(defined(OPENSSL_NO_ECDH))))
  53 // OpenSSL 0.9.8 includes some ECC support, but it's unfinished. Enable only for 1.0.0 and later.
  54 #define INSPIRCD_OPENSSL_ENABLE_ECDH
  55 #endif
  56
  57 enum issl_status { ISSL_NONE, ISSL_HANDSHAKING, ISSL_OPEN };
  58
  59 static bool SelfSigned = false;
  60 static int exdataindex;
  61
  62 char* get_error()
  63 {
  64         return ERR_error_string(ERR_get_error(), NULL);
  65 }
  66
  67 static int OnVerify(int preverify_ok, X509_STORE_CTX* ctx);
  68 static void StaticSSLInfoCallback(const SSL* ssl, int where, int rc);
  69
  70 namespace OpenSSL
  71 {
  72         class Exception : public ModuleException
  73         {
  74          public:
  75                 Exception(const std::string& reason)
  76                         : ModuleException(reason) { }
  77         };
  78
  79         class DHParams
  80         {
  81                 DH* dh;
  82
  83          public:
  84                 DHParams(const std::string& filename)
  85                 {
  86                         BIO* dhpfile = BIO_new_file(filename.c_str(), "r");
  87                         if (dhpfile == NULL)
  88                                 throw Exception("Couldn't open DH file " + filename);
  89
  90                         dh = PEM_read_bio_DHparams(dhpfile, NULL, NULL, NULL);
  91                         BIO_free(dhpfile);
  92
  93                         if (!dh)
  94                                 throw Exception("Couldn't read DH params from file " + filename);
  95                 }
  96
  97                 ~DHParams()
  98                 {
  99                         DH_free(dh);
 100                 }
 101
 102                 DH* get()
 103                 {
 104                         return dh;
 105                 }
 106         };
 107
 108         class Context
 109         {
 110                 SSL_CTX* const ctx;
 111                 long ctx_options;
 112
 113          public:
 114                 Context(SSL_CTX* context)
 115                         : ctx(context)
 116                 {
 117                         // Sane default options for OpenSSL see https://www.openssl.org/docs/ssl/SSL_CTX_set_options.html
 118                         // and when choosing a cipher, use the server's preferences instead of the client preferences.
 119                         long opts = SSL_OP_NO_SSLv2 | SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION | SSL_OP_CIPHER_SERVER_PREFERENCE | SSL_OP_SINGLE_DH_USE;
 120                         // Only turn options on if they exist
 121 #ifdef SSL_OP_SINGLE_ECDH_USE
 122                         opts |= SSL_OP_SINGLE_ECDH_USE;
 123 #endif
 124 #ifdef SSL_OP_NO_TICKET
 125                         opts |= SSL_OP_NO_TICKET;
 126 #endif
 127
 128                         ctx_options = SSL_CTX_set_options(ctx, opts);
 129
 130                         long mode = SSL_MODE_ENABLE_PARTIAL_WRITE | SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER;
 131 #ifdef SSL_MODE_RELEASE_BUFFERS
 132                         mode |= SSL_MODE_RELEASE_BUFFERS;
 133 #endif
 134                         SSL_CTX_set_mode(ctx, mode);
 135                         SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER | SSL_VERIFY_CLIENT_ONCE, OnVerify);
 136                         SSL_CTX_set_session_cache_mode(ctx, SSL_SESS_CACHE_OFF);
 137                         SSL_CTX_set_info_callback(ctx, StaticSSLInfoCallback);
 138                 }
 139
 140                 ~Context()
 141                 {
 142                         SSL_CTX_free(ctx);
 143                 }
 144
 145                 bool SetDH(DHParams& dh)
 146                 {
 147                         ERR_clear_error();
 148                         return (SSL_CTX_set_tmp_dh(ctx, dh.get()) >= 0);
 149                 }
 150
 151 #ifdef INSPIRCD_OPENSSL_ENABLE_ECDH
 152                 void SetECDH(const std::string& curvename)
 153                 {
 154                         int nid = OBJ_sn2nid(curvename.c_str());
 155                         if (nid == 0)
 156                                 throw Exception("Unknown curve: " + curvename);
 157
 158                         EC_KEY* eckey = EC_KEY_new_by_curve_name(nid);
 159                         if (!eckey)
 160                                 throw Exception("Unable to create EC key object");
 161
 162                         ERR_clear_error();
 163                         bool ret = (SSL_CTX_set_tmp_ecdh(ctx, eckey) >= 0);
 164                         EC_KEY_free(eckey);
 165                         if (!ret)
 166                                 throw Exception("Couldn't set ECDH parameters");
 167                 }
 168 #endif
 169
 170                 bool SetCiphers(const std::string& ciphers)
 171                 {
 172                         ERR_clear_error();
 173                         return SSL_CTX_set_cipher_list(ctx, ciphers.c_str());
 174                 }
 175
 176                 bool SetCerts(const std::string& filename)
 177                 {
 178                         ERR_clear_error();
 179                         return SSL_CTX_use_certificate_chain_file(ctx, filename.c_str());
 180                 }
 181
 182                 bool SetPrivateKey(const std::string& filename)
 183                 {
 184                         ERR_clear_error();
 185                         return SSL_CTX_use_PrivateKey_file(ctx, filename.c_str(), SSL_FILETYPE_PEM);
 186                 }
 187
 188                 bool SetCA(const std::string& filename)
 189                 {
 190                         ERR_clear_error();
 191                         return SSL_CTX_load_verify_locations(ctx, filename.c_str(), 0);
 192                 }
 193
 194                 long GetDefaultContextOptions() const
 195                 {
 196                         return ctx_options;
 197                 }
 198
 199                 long SetRawContextOptions(long setoptions, long clearoptions)
 200                 {
 201                         // Clear everything
 202                         SSL_CTX_clear_options(ctx, SSL_CTX_get_options(ctx));
 203
 204                         // Set the default options and what is in the conf
 205                         SSL_CTX_set_options(ctx, ctx_options | setoptions);
 206                         return SSL_CTX_clear_options(ctx, clearoptions);
 207                 }
 208
 209                 SSL* CreateServerSession()
 210                 {
 211                         SSL* sess = SSL_new(ctx);
 212                         SSL_set_accept_state(sess); // Act as server
 213                         return sess;
 214                 }
 215
 216                 SSL* CreateClientSession()
 217                 {
 218                         SSL* sess = SSL_new(ctx);
 219                         SSL_set_connect_state(sess); // Act as client
 220                         return sess;
 221                 }
 222         };
 223
 224         class Profile : public refcountbase
 225         {
 226                 /** Name of this profile
 227                  */
 228                 const std::string name;
 229
 230                 /** DH parameters in use
 231                  */
 232                 DHParams dh;
 233
 234                 /** OpenSSL makes us have two contexts, one for servers and one for clients
 235                  */
 236                 Context ctx;
 237                 Context clictx;
 238
 239                 /** Digest to use when generating fingerprints
 240                  */
 241                 const EVP_MD* digest;
 242
 243                 /** Last error, set by error_callback()
 244                  */
 245                 std::string lasterr;
 246
 247                 /** True if renegotiations are allowed, false if not
 248                  */
 249                 const bool allowrenego;
 250
 251                 /** Rough max size of records to send
 252                  */
 253                 const unsigned int outrecsize;
 254
 255                 static int error_callback(const char* str, size_t len, void* u)
 256                 {
 257                         Profile* profile = reinterpret_cast<Profile*>(u);
 258                         profile->lasterr = std::string(str, len - 1);
 259                         return 0;
 260                 }
 261
 262                 /** Set raw OpenSSL context (SSL_CTX) options from a config tag
 263                  * @param ctxname Name of the context, client or server
 264                  * @param tag Config tag defining this profile
 265                  * @param context Context object to manipulate
 266                  */
 267                 void SetContextOptions(const std::string& ctxname, ConfigTag* tag, Context& context)
 268                 {
 269                         long setoptions = tag->getInt(ctxname + "setoptions");
 270                         long clearoptions = tag->getInt(ctxname + "clearoptions");
 271 #ifdef SSL_OP_NO_COMPRESSION
 272                         if (!tag->getBool("compression", true))
 273                                 setoptions |= SSL_OP_NO_COMPRESSION;
 274 #endif
 275                         if (!tag->getBool("sslv3", true))
 276                                 setoptions |= SSL_OP_NO_SSLv3;
 277                         if (!tag->getBool("tlsv1", true))
 278                                 setoptions |= SSL_OP_NO_TLSv1;
 279
 280                         if (!setoptions && !clearoptions)
 281                                 return; // Nothing to do
 282
 283                         ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "Setting %s %s context options, default: %ld set: %ld clear: %ld", name.c_str(), ctxname.c_str(), ctx.GetDefaultContextOptions(), setoptions, clearoptions);
 284                         long final = context.SetRawContextOptions(setoptions, clearoptions);
 285                         ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "%s %s context options: %ld", name.c_str(), ctxname.c_str(), final);
 286                 }
 287
 288          public:
 289                 Profile(const std::string& profilename, ConfigTag* tag)
 290                         : name(profilename)
 291                         , dh(ServerInstance->Config->Paths.PrependConfig(tag->getString("dhfile", "dh.pem")))
 292                         , ctx(SSL_CTX_new(SSLv23_server_method()))
 293                         , clictx(SSL_CTX_new(SSLv23_client_method()))
 294                         , allowrenego(tag->getBool("renegotiation")) // Disallow by default
 295                         , outrecsize(tag->getInt("outrecsize", 2048, 512, 16384))
 296                 {
 297                         if ((!ctx.SetDH(dh)) || (!clictx.SetDH(dh)))
 298                                 throw Exception("Couldn't set DH parameters");
 299
 300                         std::string hash = tag->getString("hash", "md5");
 301                         digest = EVP_get_digestbyname(hash.c_str());
 302                         if (digest == NULL)
 303                                 throw Exception("Unknown hash type " + hash);
 304
 305                         std::string ciphers = tag->getString("ciphers");
 306                         if (!ciphers.empty())
 307                         {
 308                                 if ((!ctx.SetCiphers(ciphers)) || (!clictx.SetCiphers(ciphers)))
 309                                 {
 310                                         ERR_print_errors_cb(error_callback, this);
 311                                         throw Exception("Can't set cipher list to \"" + ciphers + "\" " + lasterr);
 312                                 }
 313                         }
 314
 315 #ifdef INSPIRCD_OPENSSL_ENABLE_ECDH
 316                         std::string curvename = tag->getString("ecdhcurve", "prime256v1");
 317                         if (!curvename.empty())
 318                                 ctx.SetECDH(curvename);
 319 #endif
 320
 321                         SetContextOptions("server", tag, ctx);
 322                         SetContextOptions("client", tag, clictx);
 323
 324                         /* Load our keys and certificates
 325                          * NOTE: OpenSSL's error logging API sucks, don't blame us for this clusterfuck.
 326                          */
 327                         std::string filename = ServerInstance->Config->Paths.PrependConfig(tag->getString("certfile", "cert.pem"));
 328                         if ((!ctx.SetCerts(filename)) || (!clictx.SetCerts(filename)))
 329                         {
 330                                 ERR_print_errors_cb(error_callback, this);
 331                                 throw Exception("Can't read certificate file: " + lasterr);
 332                         }
 333
 334                         filename = ServerInstance->Config->Paths.PrependConfig(tag->getString("keyfile", "key.pem"));
 335                         if ((!ctx.SetPrivateKey(filename)) || (!clictx.SetPrivateKey(filename)))
 336                         {
 337                                 ERR_print_errors_cb(error_callback, this);
 338                                 throw Exception("Can't read key file: " + lasterr);
 339                         }
 340
 341                         // Load the CAs we trust
 342                         filename = ServerInstance->Config->Paths.PrependConfig(tag->getString("cafile", "ca.pem"));
 343                         if ((!ctx.SetCA(filename)) || (!clictx.SetCA(filename)))
 344                         {
 345                                 ERR_print_errors_cb(error_callback, this);
 346                                 ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "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", filename.c_str(), lasterr.c_str());
 347                         }
 348                 }
 349
 350                 const std::string& GetName() const { return name; }
 351                 SSL* CreateServerSession() { return ctx.CreateServerSession(); }
 352                 SSL* CreateClientSession() { return clictx.CreateClientSession(); }
 353                 const EVP_MD* GetDigest() { return digest; }
 354                 bool AllowRenegotiation() const { return allowrenego; }
 355                 unsigned int GetOutgoingRecordSize() const { return outrecsize; }
 356         };
 357 }
 358
 359 static int OnVerify(int preverify_ok, X509_STORE_CTX *ctx)
 360 {
 361         /* XXX: This will allow self signed certificates.
 362          * In the future if we want an option to not allow this,
 363          * we can just return preverify_ok here, and openssl
 364          * will boot off self-signed and invalid peer certs.
 365          */
 366         int ve = X509_STORE_CTX_get_error(ctx);
 367
 368         SelfSigned = (ve == X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT);
 369
 370         return 1;
 371 }
 372
 373 class OpenSSLIOHook : public SSLIOHook
 374 {
 375  private:
 376         SSL* sess;
 377         issl_status status;
 378         bool data_to_write;
 379         reference<OpenSSL::Profile> profile;
 380
 381         // Returns 1 if handshake succeeded, 0 if it is still in progress, -1 if it failed
 382         int Handshake(StreamSocket* user)
 383         {
 384                 ERR_clear_error();
 385                 int ret = SSL_do_handshake(sess);
 386                 if (ret < 0)
 387                 {
 388                         int err = SSL_get_error(sess, ret);
 389
 390                         if (err == SSL_ERROR_WANT_READ)
 391                         {
 392                                 SocketEngine::ChangeEventMask(user, FD_WANT_POLL_READ | FD_WANT_NO_WRITE);
 393                                 this->status = ISSL_HANDSHAKING;
 394                                 return 0;
 395                         }
 396                         else if (err == SSL_ERROR_WANT_WRITE)
 397                         {
 398                                 SocketEngine::ChangeEventMask(user, FD_WANT_NO_READ | FD_WANT_SINGLE_WRITE);
 399                                 this->status = ISSL_HANDSHAKING;
 400                                 return 0;
 401                         }
 402                         else
 403                         {
 404                                 CloseSession();
 405                                 return -1;
 406                         }
 407                 }
 408                 else if (ret > 0)
 409                 {
 410                         // Handshake complete.
 411                         VerifyCertificate();
 412
 413                         status = ISSL_OPEN;
 414
 415                         SocketEngine::ChangeEventMask(user, FD_WANT_POLL_READ | FD_WANT_NO_WRITE | FD_ADD_TRIAL_WRITE);
 416
 417                         return 1;
 418                 }
 419                 else if (ret == 0)
 420                 {
 421                         CloseSession();
 422                 }
 423                 return -1;
 424         }
 425
 426         void CloseSession()
 427         {
 428                 if (sess)
 429                 {
 430                         SSL_shutdown(sess);
 431                         SSL_free(sess);
 432                 }
 433                 sess = NULL;
 434                 certificate = NULL;
 435                 status = ISSL_NONE;
 436         }
 437
 438         void VerifyCertificate()
 439         {
 440                 X509* cert;
 441                 ssl_cert* certinfo = new ssl_cert;
 442                 this->certificate = certinfo;
 443                 unsigned int n;
 444                 unsigned char md[EVP_MAX_MD_SIZE];
 445
 446                 cert = SSL_get_peer_certificate(sess);
 447
 448                 if (!cert)
 449                 {
 450                         certinfo->error = "Could not get peer certificate: "+std::string(get_error());
 451                         return;
 452                 }
 453
 454                 certinfo->invalid = (SSL_get_verify_result(sess) != X509_V_OK);
 455
 456                 if (!SelfSigned)
 457                 {
 458                         certinfo->unknownsigner = false;
 459                         certinfo->trusted = true;
 460                 }
 461                 else
 462                 {
 463                         certinfo->unknownsigner = true;
 464                         certinfo->trusted = false;
 465                 }
 466
 467                 char buf[512];
 468                 X509_NAME_oneline(X509_get_subject_name(cert), buf, sizeof(buf));
 469                 certinfo->dn = buf;
 470                 // Make sure there are no chars in the string that we consider invalid
 471                 if (certinfo->dn.find_first_of("\r\n") != std::string::npos)
 472                         certinfo->dn.clear();
 473
 474                 X509_NAME_oneline(X509_get_issuer_name(cert), buf, sizeof(buf));
 475                 certinfo->issuer = buf;
 476                 if (certinfo->issuer.find_first_of("\r\n") != std::string::npos)
 477                         certinfo->issuer.clear();
 478
 479                 if (!X509_digest(cert, profile->GetDigest(), md, &n))
 480                 {
 481                         certinfo->error = "Out of memory generating fingerprint";
 482                 }
 483                 else
 484                 {
 485                         certinfo->fingerprint = BinToHex(md, n);
 486                 }
 487
 488                 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))
 489                 {
 490                         certinfo->error = "Not activated, or expired certificate";
 491                 }
 492
 493                 X509_free(cert);
 494         }
 495
 496         void SSLInfoCallback(int where, int rc)
 497         {
 498                 if ((where & SSL_CB_HANDSHAKE_START) && (status == ISSL_OPEN))
 499                 {
 500                         if (profile->AllowRenegotiation())
 501                                 return;
 502
 503                         // The other side is trying to renegotiate, kill the connection and change status
 504                         // to ISSL_NONE so CheckRenego() closes the session
 505                         status = ISSL_NONE;
 506                         SocketEngine::Shutdown(SSL_get_fd(sess), 2);
 507                 }
 508         }
 509
 510         bool CheckRenego(StreamSocket* sock)
 511         {
 512                 if (status != ISSL_NONE)
 513                         return true;
 514
 515                 ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "Session %p killed, attempted to renegotiate", (void*)sess);
 516                 CloseSession();
 517                 sock->SetError("Renegotiation is not allowed");
 518                 return false;
 519         }
 520
 521         // Returns 1 if application I/O should proceed, 0 if it must wait for the underlying protocol to progress, -1 on fatal error
 522         int PrepareIO(StreamSocket* sock)
 523         {
 524                 if (status == ISSL_OPEN)
 525                         return 1;
 526                 else if (status == ISSL_HANDSHAKING)
 527                 {
 528                         // The handshake isn't finished, try to finish it
 529                         return Handshake(sock);
 530                 }
 531
 532                 CloseSession();
 533                 return -1;
 534         }
 535
 536         // Calls our private SSLInfoCallback()
 537         friend void StaticSSLInfoCallback(const SSL* ssl, int where, int rc);
 538
 539  public:
 540         OpenSSLIOHook(IOHookProvider* hookprov, StreamSocket* sock, SSL* session, const reference<OpenSSL::Profile>& sslprofile)
 541                 : SSLIOHook(hookprov)
 542                 , sess(session)
 543                 , status(ISSL_NONE)
 544                 , data_to_write(false)
 545                 , profile(sslprofile)
 546         {
 547                 if (sess == NULL)
 548                         return;
 549                 if (SSL_set_fd(sess, sock->GetFd()) == 0)
 550                         throw ModuleException("Can't set fd with SSL_set_fd: " + ConvToStr(sock->GetFd()));
 551
 552                 SSL_set_ex_data(sess, exdataindex, this);
 553                 sock->AddIOHook(this);
 554                 Handshake(sock);
 555         }
 556
 557         void OnStreamSocketClose(StreamSocket* user) CXX11_OVERRIDE
 558         {
 559                 CloseSession();
 560         }
 561
 562         int OnStreamSocketRead(StreamSocket* user, std::string& recvq) CXX11_OVERRIDE
 563         {
 564                 // Finish handshake if needed
 565                 int prepret = PrepareIO(user);
 566                 if (prepret <= 0)
 567                         return prepret;
 568
 569                 // If we resumed the handshake then this->status will be ISSL_OPEN
 570                 {
 571                         ERR_clear_error();
 572                         char* buffer = ServerInstance->GetReadBuffer();
 573                         size_t bufsiz = ServerInstance->Config->NetBufferSize;
 574                         int ret = SSL_read(sess, buffer, bufsiz);
 575
 576                         if (!CheckRenego(user))
 577                                 return -1;
 578
 579                         if (ret > 0)
 580                         {
 581                                 recvq.append(buffer, ret);
 582                                 if (data_to_write)
 583                                         SocketEngine::ChangeEventMask(user, FD_WANT_POLL_READ | FD_WANT_SINGLE_WRITE);
 584                                 return 1;
 585                         }
 586                         else if (ret == 0)
 587                         {
 588                                 // Client closed connection.
 589                                 CloseSession();
 590                                 user->SetError("Connection closed");
 591                                 return -1;
 592                         }
 593                         else // if (ret < 0)
 594                         {
 595                                 int err = SSL_get_error(sess, ret);
 596
 597                                 if (err == SSL_ERROR_WANT_READ)
 598                                 {
 599                                         SocketEngine::ChangeEventMask(user, FD_WANT_POLL_READ);
 600                                         return 0;
 601                                 }
 602                                 else if (err == SSL_ERROR_WANT_WRITE)
 603                                 {
 604                                         SocketEngine::ChangeEventMask(user, FD_WANT_NO_READ | FD_WANT_SINGLE_WRITE);
 605                                         return 0;
 606                                 }
 607                                 else
 608                                 {
 609                                         CloseSession();
 610                                         return -1;
 611                                 }
 612                         }
 613                 }
 614         }
 615
 616         int OnStreamSocketWrite(StreamSocket* user) CXX11_OVERRIDE
 617         {
 618                 // Finish handshake if needed
 619                 int prepret = PrepareIO(user);
 620                 if (prepret <= 0)
 621                         return prepret;
 622
 623                 data_to_write = true;
 624
 625                 // Session is ready for transferring application data
 626                 StreamSocket::SendQueue& sendq = user->GetSendQ();
 627                 while (!sendq.empty())
 628                 {
 629                         ERR_clear_error();
 630                         FlattenSendQueue(sendq, profile->GetOutgoingRecordSize());
 631                         const StreamSocket::SendQueue::Element& buffer = sendq.front();
 632                         int ret = SSL_write(sess, buffer.data(), buffer.size());
 633
 634                         if (!CheckRenego(user))
 635                                 return -1;
 636
 637                         if (ret == (int)buffer.length())
 638                         {
 639                                 // Wrote entire record, continue sending
 640                                 sendq.pop_front();
 641                         }
 642                         else if (ret > 0)
 643                         {
 644                                 sendq.erase_front(ret);
 645                                 SocketEngine::ChangeEventMask(user, FD_WANT_SINGLE_WRITE);
 646                                 return 0;
 647                         }
 648                         else if (ret == 0)
 649                         {
 650                                 CloseSession();
 651                                 return -1;
 652                         }
 653                         else // if (ret < 0)
 654                         {
 655                                 int err = SSL_get_error(sess, ret);
 656
 657                                 if (err == SSL_ERROR_WANT_WRITE)
 658                                 {
 659                                         SocketEngine::ChangeEventMask(user, FD_WANT_SINGLE_WRITE);
 660                                         return 0;
 661                                 }
 662                                 else if (err == SSL_ERROR_WANT_READ)
 663                                 {
 664                                         SocketEngine::ChangeEventMask(user, FD_WANT_POLL_READ);
 665                                         return 0;
 666                                 }
 667                                 else
 668                                 {
 669                                         CloseSession();
 670                                         return -1;
 671                                 }
 672                         }
 673                 }
 674
 675                 data_to_write = false;
 676                 SocketEngine::ChangeEventMask(user, FD_WANT_POLL_READ | FD_WANT_NO_WRITE);
 677                 return 1;
 678         }
 679
 680         void TellCiphersAndFingerprint(LocalUser* user)
 681         {
 682                 if (sess)
 683                 {
 684                         std::string text = "*** You are connected using SSL cipher '";
 685                         GetCiphersuite(text);
 686                         text += '\'';
 687                         const std::string& fingerprint = certificate->fingerprint;
 688                         if (!fingerprint.empty())
 689                                 text += " and your SSL certificate fingerprint is " + fingerprint;
 690
 691                         user->WriteNotice(text);
 692                 }
 693         }
 694
 695         void GetCiphersuite(std::string& out) const
 696         {
 697                 out.append(SSL_get_version(sess)).push_back('-');
 698                 out.append(SSL_get_cipher(sess));
 699         }
 700
 701         bool IsHandshakeDone() const { return (status == ISSL_OPEN); }
 702 };
 703
 704 static void StaticSSLInfoCallback(const SSL* ssl, int where, int rc)
 705 {
 706         OpenSSLIOHook* hook = static_cast<OpenSSLIOHook*>(SSL_get_ex_data(ssl, exdataindex));
 707         hook->SSLInfoCallback(where, rc);
 708 }
 709
 710 class OpenSSLIOHookProvider : public refcountbase, public IOHookProvider
 711 {
 712         reference<OpenSSL::Profile> profile;
 713
 714  public:
 715         OpenSSLIOHookProvider(Module* mod, reference<OpenSSL::Profile>& prof)
 716                 : IOHookProvider(mod, "ssl/" + prof->GetName(), IOHookProvider::IOH_SSL)
 717                 , profile(prof)
 718         {
 719                 ServerInstance->Modules->AddService(*this);
 720         }
 721
 722         ~OpenSSLIOHookProvider()
 723         {
 724                 ServerInstance->Modules->DelService(*this);
 725         }
 726
 727         void OnAccept(StreamSocket* sock, irc::sockets::sockaddrs* client, irc::sockets::sockaddrs* server) CXX11_OVERRIDE
 728         {
 729                 new OpenSSLIOHook(this, sock, profile->CreateServerSession(), profile);
 730         }
 731
 732         void OnConnect(StreamSocket* sock) CXX11_OVERRIDE
 733         {
 734                 new OpenSSLIOHook(this, sock, profile->CreateClientSession(), profile);
 735         }
 736 };
 737
 738 class ModuleSSLOpenSSL : public Module
 739 {
 740         typedef std::vector<reference<OpenSSLIOHookProvider> > ProfileList;
 741
 742         ProfileList profiles;
 743
 744         void ReadProfiles()
 745         {
 746                 ProfileList newprofiles;
 747                 ConfigTagList tags = ServerInstance->Config->ConfTags("sslprofile");
 748                 if (tags.first == tags.second)
 749                 {
 750                         // Create a default profile named "openssl"
 751                         const std::string defname = "openssl";
 752                         ConfigTag* tag = ServerInstance->Config->ConfValue(defname);
 753                         ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "No <sslprofile> tags found, using settings from the <openssl> tag");
 754
 755                         try
 756                         {
 757                                 reference<OpenSSL::Profile> profile(new OpenSSL::Profile(defname, tag));
 758                                 newprofiles.push_back(new OpenSSLIOHookProvider(this, profile));
 759                         }
 760                         catch (OpenSSL::Exception& ex)
 761                         {
 762                                 throw ModuleException("Error while initializing the default SSL profile - " + ex.GetReason());
 763                         }
 764                 }
 765
 766                 for (ConfigIter i = tags.first; i != tags.second; ++i)
 767                 {
 768                         ConfigTag* tag = i->second;
 769                         if (tag->getString("provider") != "openssl")
 770                                 continue;
 771
 772                         std::string name = tag->getString("name");
 773                         if (name.empty())
 774                         {
 775                                 ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "Ignoring <sslprofile> tag without name at " + tag->getTagLocation());
 776                                 continue;
 777                         }
 778
 779                         reference<OpenSSL::Profile> profile;
 780                         try
 781                         {
 782                                 profile = new OpenSSL::Profile(name, tag);
 783                         }
 784                         catch (CoreException& ex)
 785                         {
 786                                 throw ModuleException("Error while initializing SSL profile \"" + name + "\" at " + tag->getTagLocation() + " - " + ex.GetReason());
 787                         }
 788
 789                         newprofiles.push_back(new OpenSSLIOHookProvider(this, profile));
 790                 }
 791
 792                 profiles.swap(newprofiles);
 793         }
 794
 795  public:
 796         ModuleSSLOpenSSL()
 797         {
 798                 // Initialize OpenSSL
 799                 SSL_library_init();
 800                 SSL_load_error_strings();
 801         }
 802
 803         void init() CXX11_OVERRIDE
 804         {
 805                 ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "OpenSSL lib version \"%s\" module was compiled for \"" OPENSSL_VERSION_TEXT "\"", SSLeay_version(SSLEAY_VERSION));
 806
 807                 // Register application specific data
 808                 char exdatastr[] = "inspircd";
 809                 exdataindex = SSL_get_ex_new_index(0, exdatastr, NULL, NULL, NULL);
 810                 if (exdataindex < 0)
 811                         throw ModuleException("Failed to register application specific data");
 812
 813                 ReadProfiles();
 814         }
 815
 816         void OnModuleRehash(User* user, const std::string &param) CXX11_OVERRIDE
 817         {
 818                 if (param != "ssl")
 819                         return;
 820
 821                 try
 822                 {
 823                         ReadProfiles();
 824                 }
 825                 catch (ModuleException& ex)
 826                 {
 827                         ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, ex.GetReason() + " Not applying settings.");
 828                 }
 829         }
 830
 831         void OnUserConnect(LocalUser* user) CXX11_OVERRIDE
 832         {
 833                 IOHook* hook = user->eh.GetIOHook();
 834                 if (hook && hook->prov->creator == this)
 835                         static_cast<OpenSSLIOHook*>(hook)->TellCiphersAndFingerprint(user);
 836         }
 837
 838         void OnCleanup(int target_type, void* item) CXX11_OVERRIDE
 839         {
 840                 if (target_type == TYPE_USER)
 841                 {
 842                         LocalUser* user = IS_LOCAL((User*)item);
 843
 844                         if (user && user->eh.GetIOHook() && user->eh.GetIOHook()->prov->creator == this)
 845                         {
 846                                 // User is using SSL, they're a local user, and they're using one of *our* SSL ports.
 847                                 // Potentially there could be multiple SSL modules loaded at once on different ports.
 848                                 ServerInstance->Users->QuitUser(user, "SSL module unloading");
 849                         }
 850                 }
 851         }
 852
 853         ModResult OnCheckReady(LocalUser* user) CXX11_OVERRIDE
 854         {
 855                 if ((user->eh.GetIOHook()) && (user->eh.GetIOHook()->prov->creator == this))
 856                 {
 857                         OpenSSLIOHook* iohook = static_cast<OpenSSLIOHook*>(user->eh.GetIOHook());
 858                         if (!iohook->IsHandshakeDone())
 859                                 return MOD_RES_DENY;
 860                 }
 861
 862                 return MOD_RES_PASSTHRU;
 863         }
 864
 865         Version GetVersion() CXX11_OVERRIDE
 866         {
 867                 return Version("Provides SSL support for clients", VF_VENDOR);
 868         }
 869 };
 870
 871 MODULE_INIT(ModuleSSLOpenSSL)