src/modules/extra/m_ssl_openssl.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2009 InspIRCd Development Team
   6  * See: http://wiki.inspircd.org/Credits
   7  *
   8  * This program is free but copyrighted software; see
   9  *            the file COPYING for details.
  10  *
  11  * ---------------------------------------------------
  12  */
  13
  14 #include "inspircd.h"
  15 #include <openssl/ssl.h>
  16 #include <openssl/err.h>
  17 #include "transport.h"
  18
  19 #ifdef WINDOWS
  20 #pragma comment(lib, "libeay32MTd")
  21 #pragma comment(lib, "ssleay32MTd")
  22 #undef MAX_DESCRIPTORS
  23 #define MAX_DESCRIPTORS 10000
  24 #endif
  25
  26 /* $ModDesc: Provides SSL support for clients */
  27
  28 /* $LinkerFlags: if("USE_FREEBSD_BASE_SSL") -lssl -lcrypto */
  29 /* $CompileFlags: if(!"USE_FREEBSD_BASE_SSL") pkgconfversion("openssl","0.9.7") pkgconfincludes("openssl","/openssl/ssl.h","") */
  30 /* $LinkerFlags: if(!"USE_FREEBSD_BASE_SSL") rpath("pkg-config --libs openssl") pkgconflibs("openssl","/libssl.so","-lssl -lcrypto -ldl") */
  31
  32 /* $ModDep: transport.h */
  33 /* $NoPedantic */
  34 /* $CopyInstall: conf/key.pem $(CONPATH) */
  35 /* $CopyInstall: conf/cert.pem $(CONPATH) */
  36
  37
  38 enum issl_status { ISSL_NONE, ISSL_HANDSHAKING, ISSL_OPEN };
  39 enum issl_io_status { ISSL_WRITE, ISSL_READ };
  40
  41 static bool SelfSigned = false;
  42
  43 char* get_error()
  44 {
  45         return ERR_error_string(ERR_get_error(), NULL);
  46 }
  47
  48 static int error_callback(const char *str, size_t len, void *u);
  49
  50 /** Represents an SSL user's extra data
  51  */
  52 class issl_session : public classbase
  53 {
  54 public:
  55         SSL* sess;
  56         issl_status status;
  57         issl_io_status rstat;
  58         issl_io_status wstat;
  59
  60         unsigned int inbufoffset;
  61         char* inbuf;                    // Buffer OpenSSL reads into.
  62         std::string outbuf;     // Buffer for outgoing data that OpenSSL will not take.
  63         int fd;
  64         bool outbound;
  65
  66         issl_session()
  67         {
  68                 outbound = false;
  69                 rstat = ISSL_READ;
  70                 wstat = ISSL_WRITE;
  71         }
  72 };
  73
  74 static int OnVerify(int preverify_ok, X509_STORE_CTX *ctx)
  75 {
  76         /* XXX: This will allow self signed certificates.
  77          * In the future if we want an option to not allow this,
  78          * we can just return preverify_ok here, and openssl
  79          * will boot off self-signed and invalid peer certs.
  80          */
  81         int ve = X509_STORE_CTX_get_error(ctx);
  82
  83         SelfSigned = (ve == X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT);
  84
  85         return 1;
  86 }
  87
  88 class ModuleSSLOpenSSL : public Module
  89 {
  90         std::set<ListenSocketBase*> listenports;
  91
  92         int inbufsize;
  93         issl_session* sessions;
  94
  95         SSL_CTX* ctx;
  96         SSL_CTX* clictx;
  97
  98         char* dummy;
  99         char cipher[MAXBUF];
 100
 101         std::string keyfile;
 102         std::string certfile;
 103         std::string cafile;
 104         // std::string crlfile;
 105         std::string dhfile;
 106         std::string sslports;
 107
 108  public:
 109
 110         InspIRCd* PublicInstance;
 111
 112         ModuleSSLOpenSSL(InspIRCd* Me)
 113         : Module(Me), PublicInstance(Me)
 114         {
 115                 ServerInstance->Modules->PublishInterface("BufferedSocketHook", this);
 116
 117                 sessions = new issl_session[ServerInstance->SE->GetMaxFds()];
 118
 119                 // Not rehashable...because I cba to reduce all the sizes of existing buffers.
 120                 inbufsize = ServerInstance->Config->NetBufferSize;
 121
 122                 /* Global SSL library initialization*/
 123                 SSL_library_init();
 124                 SSL_load_error_strings();
 125
 126                 /* Build our SSL contexts:
 127                  * NOTE: OpenSSL makes us have two contexts, one for servers and one for clients. ICK.
 128                  */
 129                 ctx = SSL_CTX_new( SSLv23_server_method() );
 130                 clictx = SSL_CTX_new( SSLv23_client_method() );
 131
 132                 SSL_CTX_set_mode(ctx, SSL_MODE_ENABLE_PARTIAL_WRITE | SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER);
 133                 SSL_CTX_set_mode(clictx, SSL_MODE_ENABLE_PARTIAL_WRITE | SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER);
 134
 135                 SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER | SSL_VERIFY_CLIENT_ONCE, OnVerify);
 136                 SSL_CTX_set_verify(clictx, SSL_VERIFY_PEER | SSL_VERIFY_CLIENT_ONCE, OnVerify);
 137
 138                 // Needs the flag as it ignores a plain /rehash
 139                 OnModuleRehash(NULL,"ssl");
 140                 Implementation eventlist[] = { I_OnRawSocketConnect, I_OnRawSocketAccept,
 141                         I_OnRawSocketClose, I_OnRawSocketRead, I_OnRawSocketWrite, I_OnCleanup, I_On005Numeric,
 142                         I_OnBufferFlushed, I_OnRequest, I_OnRehash, I_OnModuleRehash, I_OnPostConnect,
 143                         I_OnHookIO };
 144                 ServerInstance->Modules->Attach(eventlist, this, sizeof(eventlist)/sizeof(Implementation));
 145         }
 146
 147         virtual void OnHookIO(EventHandler* user, ListenSocketBase* lsb)
 148         {
 149                 if (!user->GetIOHook() && listenports.find(lsb) != listenports.end())
 150                 {
 151                         /* Hook the user with our module */
 152                         user->AddIOHook(this);
 153                 }
 154         }
 155
 156         virtual void OnRehash(User* user)
 157         {
 158                 ConfigReader Conf(ServerInstance);
 159
 160                 listenports.clear();
 161                 sslports.clear();
 162
 163                 for (size_t i = 0; i < ServerInstance->ports.size(); i++)
 164                 {
 165                         ListenSocketBase* port = ServerInstance->ports[i];
 166                         std::string desc = port->GetDescription();
 167                         if (desc != "openssl")
 168                                 continue;
 169
 170                         listenports.insert(port);
 171                         std::string portid = port->GetBindDesc();
 172
 173                         ServerInstance->Logs->Log("m_ssl_openssl", DEFAULT, "m_ssl_openssl.so: Enabling SSL for port %s", portid.c_str());
 174                         if (port->GetIP() != "127.0.0.1")
 175                                 sslports.append(portid).append(";");
 176                 }
 177
 178                 if (!sslports.empty())
 179                         sslports.erase(sslports.end() - 1);
 180         }
 181
 182         virtual void OnModuleRehash(User* user, const std::string &param)
 183         {
 184                 if (param != "ssl")
 185                         return;
 186
 187                 OnRehash(user);
 188
 189                 ConfigReader Conf(ServerInstance);
 190
 191                 std::string confdir(ServerInstance->ConfigFileName);
 192                 // +1 so we the path ends with a /
 193                 confdir = confdir.substr(0, confdir.find_last_of('/') + 1);
 194
 195                 cafile   = Conf.ReadValue("openssl", "cafile", 0);
 196                 certfile = Conf.ReadValue("openssl", "certfile", 0);
 197                 keyfile  = Conf.ReadValue("openssl", "keyfile", 0);
 198                 dhfile   = Conf.ReadValue("openssl", "dhfile", 0);
 199
 200                 // Set all the default values needed.
 201                 if (cafile.empty())
 202                         cafile = "ca.pem";
 203
 204                 if (certfile.empty())
 205                         certfile = "cert.pem";
 206
 207                 if (keyfile.empty())
 208                         keyfile = "key.pem";
 209
 210                 if (dhfile.empty())
 211                         dhfile = "dhparams.pem";
 212
 213                 // Prepend relative paths with the path to the config directory.
 214                 if ((cafile[0] != '/') && (!ServerInstance->Config->StartsWithWindowsDriveLetter(cafile)))
 215                         cafile = confdir + cafile;
 216
 217                 if ((certfile[0] != '/') && (!ServerInstance->Config->StartsWithWindowsDriveLetter(certfile)))
 218                         certfile = confdir + certfile;
 219
 220                 if ((keyfile[0] != '/') && (!ServerInstance->Config->StartsWithWindowsDriveLetter(keyfile)))
 221                         keyfile = confdir + keyfile;
 222
 223                 if ((dhfile[0] != '/') && (!ServerInstance->Config->StartsWithWindowsDriveLetter(dhfile)))
 224                         dhfile = confdir + dhfile;
 225
 226                 /* Load our keys and certificates
 227                  * NOTE: OpenSSL's error logging API sucks, don't blame us for this clusterfuck.
 228                  */
 229                 if ((!SSL_CTX_use_certificate_chain_file(ctx, certfile.c_str())) || (!SSL_CTX_use_certificate_chain_file(clictx, certfile.c_str())))
 230                 {
 231                         ServerInstance->Logs->Log("m_ssl_openssl",DEFAULT, "m_ssl_openssl.so: Can't read certificate file %s. %s", certfile.c_str(), strerror(errno));
 232                         ERR_print_errors_cb(error_callback, this);
 233                 }
 234
 235                 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)))
 236                 {
 237                         ServerInstance->Logs->Log("m_ssl_openssl",DEFAULT, "m_ssl_openssl.so: Can't read key file %s. %s", keyfile.c_str(), strerror(errno));
 238                         ERR_print_errors_cb(error_callback, this);
 239                 }
 240
 241                 /* Load the CAs we trust*/
 242                 if (((!SSL_CTX_load_verify_locations(ctx, cafile.c_str(), 0))) || (!SSL_CTX_load_verify_locations(clictx, cafile.c_str(), 0)))
 243                 {
 244                         ServerInstance->Logs->Log("m_ssl_openssl",DEFAULT, "m_ssl_openssl.so: Can't read CA list from %s. %s", cafile.c_str(), strerror(errno));
 245                         ERR_print_errors_cb(error_callback, this);
 246                 }
 247
 248                 FILE* dhpfile = fopen(dhfile.c_str(), "r");
 249                 DH* ret;
 250
 251                 if (dhpfile == NULL)
 252                 {
 253                         ServerInstance->Logs->Log("m_ssl_openssl",DEFAULT, "m_ssl_openssl.so Couldn't open DH file %s: %s", dhfile.c_str(), strerror(errno));
 254                         throw ModuleException("Couldn't open DH file " + dhfile + ": " + strerror(errno));
 255                 }
 256                 else
 257                 {
 258                         ret = PEM_read_DHparams(dhpfile, NULL, NULL, NULL);
 259                         if ((SSL_CTX_set_tmp_dh(ctx, ret) < 0) || (SSL_CTX_set_tmp_dh(clictx, ret) < 0))
 260                         {
 261                                 ServerInstance->Logs->Log("m_ssl_openssl",DEFAULT, "m_ssl_openssl.so: Couldn't set DH parameters %s. SSL errors follow:", dhfile.c_str());
 262                                 ERR_print_errors_cb(error_callback, this);
 263                         }
 264                 }
 265
 266                 fclose(dhpfile);
 267         }
 268
 269         virtual void On005Numeric(std::string &output)
 270         {
 271                 if (!sslports.empty())
 272                         output.append(" SSL=" + sslports);
 273         }
 274
 275         virtual ~ModuleSSLOpenSSL()
 276         {
 277                 SSL_CTX_free(ctx);
 278                 SSL_CTX_free(clictx);
 279                 ServerInstance->Modules->UnpublishInterface("BufferedSocketHook", this);
 280                 delete[] sessions;
 281         }
 282
 283         virtual void OnCleanup(int target_type, void* item)
 284         {
 285                 if (target_type == TYPE_USER)
 286                 {
 287                         User* user = (User*)item;
 288
 289                         if (user->GetIOHook() == this)
 290                         {
 291                                 // User is using SSL, they're a local user, and they're using one of *our* SSL ports.
 292                                 // Potentially there could be multiple SSL modules loaded at once on different ports.
 293                                 ServerInstance->Users->QuitUser(user, "SSL module unloading");
 294                                 user->DelIOHook();
 295                         }
 296                         if (user->GetExt("ssl_cert", dummy))
 297                         {
 298                                 ssl_cert* tofree;
 299                                 user->GetExt("ssl_cert", tofree);
 300                                 delete tofree;
 301                                 user->Shrink("ssl_cert");
 302                         }
 303                 }
 304         }
 305
 306         virtual Version GetVersion()
 307         {
 308                 return Version("$Id$", VF_VENDOR, API_VERSION);
 309         }
 310
 311
 312         virtual const char* OnRequest(Request* request)
 313         {
 314                 ISHRequest* ISR = (ISHRequest*)request;
 315                 if (strcmp("IS_NAME", request->GetId()) == 0)
 316                 {
 317                         return "openssl";
 318                 }
 319                 else if (strcmp("IS_HOOK", request->GetId()) == 0)
 320                 {
 321                         const char* ret = "OK";
 322                         try
 323                         {
 324                                 ret = ISR->Sock->AddIOHook((Module*)this) ? "OK" : NULL;
 325                         }
 326                         catch (ModuleException &e)
 327                         {
 328                                 return NULL;
 329                         }
 330
 331                         return ret;
 332                 }
 333                 else if (strcmp("IS_UNHOOK", request->GetId()) == 0)
 334                 {
 335                         return ISR->Sock->DelIOHook() ? "OK" : NULL;
 336                 }
 337                 else if (strcmp("IS_HSDONE", request->GetId()) == 0)
 338                 {
 339                         if (ISR->Sock->GetFd() < 0)
 340                                 return "OK";
 341
 342                         issl_session* session = &sessions[ISR->Sock->GetFd()];
 343                         return (session->status == ISSL_HANDSHAKING) ? NULL : "OK";
 344                 }
 345                 else if (strcmp("IS_ATTACH", request->GetId()) == 0)
 346                 {
 347                         issl_session* session = &sessions[ISR->Sock->GetFd()];
 348                         if (session->sess)
 349                         {
 350                                 VerifyCertificate(session, (BufferedSocket*)ISR->Sock);
 351                                 return "OK";
 352                         }
 353                 }
 354                 else if (strcmp("GET_FP", request->GetId()) == 0)
 355                 {
 356                         if (ISR->Sock->GetFd() > -1)
 357                         {
 358                                 issl_session* session = &sessions[ISR->Sock->GetFd()];
 359                                 if (session->sess)
 360                                 {
 361                                         Extensible* ext = ISR->Sock;
 362                                         ssl_cert* certinfo;
 363                                         if (ext->GetExt("ssl_cert",certinfo))
 364                                                 return certinfo->GetFingerprint().c_str();
 365                                 }
 366                         }
 367                 }
 368                 return NULL;
 369         }
 370
 371
 372         virtual void OnRawSocketAccept(int fd, irc::sockets::sockaddrs* client, irc::sockets::sockaddrs* server)
 373         {
 374                 /* Are there any possibilities of an out of range fd? Hope not, but lets be paranoid */
 375                 if ((fd < 0) || (fd > ServerInstance->SE->GetMaxFds() - 1))
 376                         return;
 377
 378                 issl_session* session = &sessions[fd];
 379
 380                 session->fd = fd;
 381                 session->inbuf = new char[inbufsize];
 382                 session->inbufoffset = 0;
 383                 session->sess = SSL_new(ctx);
 384                 session->status = ISSL_NONE;
 385                 session->outbound = false;
 386
 387                 if (session->sess == NULL)
 388                         return;
 389
 390                 if (SSL_set_fd(session->sess, fd) == 0)
 391                 {
 392                         ServerInstance->Logs->Log("m_ssl_openssl",DEBUG,"BUG: Can't set fd with SSL_set_fd: %d", fd);
 393                         return;
 394                 }
 395
 396                 Handshake(session);
 397         }
 398
 399         virtual void OnRawSocketConnect(int fd)
 400         {
 401                 /* Are there any possibilities of an out of range fd? Hope not, but lets be paranoid */
 402                 if ((fd < 0) || (fd > ServerInstance->SE->GetMaxFds() -1))
 403                         return;
 404
 405                 issl_session* session = &sessions[fd];
 406
 407                 session->fd = fd;
 408                 session->inbuf = new char[inbufsize];
 409                 session->inbufoffset = 0;
 410                 session->sess = SSL_new(clictx);
 411                 session->status = ISSL_NONE;
 412                 session->outbound = true;
 413
 414                 if (session->sess == NULL)
 415                         return;
 416
 417                 if (SSL_set_fd(session->sess, fd) == 0)
 418                 {
 419                         ServerInstance->Logs->Log("m_ssl_openssl",DEBUG,"BUG: Can't set fd with SSL_set_fd: %d", fd);
 420                         return;
 421                 }
 422
 423                 Handshake(session);
 424         }
 425
 426         virtual void OnRawSocketClose(int fd)
 427         {
 428                 /* Are there any possibilities of an out of range fd? Hope not, but lets be paranoid */
 429                 if ((fd < 0) || (fd > ServerInstance->SE->GetMaxFds() - 1))
 430                         return;
 431
 432                 CloseSession(&sessions[fd]);
 433
 434                 EventHandler* user = ServerInstance->SE->GetRef(fd);
 435
 436                 if ((user) && (user->GetExt("ssl_cert", dummy)))
 437                 {
 438                         ssl_cert* tofree;
 439                         user->GetExt("ssl_cert", tofree);
 440                         delete tofree;
 441                         user->Shrink("ssl_cert");
 442                 }
 443         }
 444
 445         virtual int OnRawSocketRead(int fd, char* buffer, unsigned int count, int &readresult)
 446         {
 447                 /* Are there any possibilities of an out of range fd? Hope not, but lets be paranoid */
 448                 if ((fd < 0) || (fd > ServerInstance->SE->GetMaxFds() - 1))
 449                         return 0;
 450
 451                 issl_session* session = &sessions[fd];
 452
 453                 if (!session->sess)
 454                 {
 455                         readresult = 0;
 456                         CloseSession(session);
 457                         return 1;
 458                 }
 459
 460                 if (session->status == ISSL_HANDSHAKING)
 461                 {
 462                         if (session->rstat == ISSL_READ || session->wstat == ISSL_READ)
 463                         {
 464                                 // The handshake isn't finished and it wants to read, try to finish it.
 465                                 if (!Handshake(session))
 466                                 {
 467                                         // Couldn't resume handshake.
 468                                         errno = session->status == ISSL_NONE ? EIO : EAGAIN;
 469                                         return -1;
 470                                 }
 471                         }
 472                         else
 473                         {
 474                                 errno = EAGAIN;
 475                                 return -1;
 476                         }
 477                 }
 478
 479                 // If we resumed the handshake then session->status will be ISSL_OPEN
 480
 481                 if (session->status == ISSL_OPEN)
 482                 {
 483                         if (session->wstat == ISSL_READ)
 484                         {
 485                                 if(DoWrite(session) == 0)
 486                                         return 0;
 487                         }
 488
 489                         if (session->rstat == ISSL_READ)
 490                         {
 491                                 int ret = DoRead(session);
 492
 493                                 if (ret > 0)
 494                                 {
 495                                         if (count <= session->inbufoffset)
 496                                         {
 497                                                 memcpy(buffer, session->inbuf, count);
 498                                                 // Move the stuff left in inbuf to the beginning of it
 499                                                 memmove(session->inbuf, session->inbuf + count, (session->inbufoffset - count));
 500                                                 // Now we need to set session->inbufoffset to the amount of data still waiting to be handed to insp.
 501                                                 session->inbufoffset -= count;
 502                                                 // Insp uses readresult as the count of how much data there is in buffer, so:
 503                                                 readresult = count;
 504                                         }
 505                                         else
 506                                         {
 507                                                 // There's not as much in the inbuf as there is space in the buffer, so just copy the whole thing.
 508                                                 memcpy(buffer, session->inbuf, session->inbufoffset);
 509
 510                                                 readresult = session->inbufoffset;
 511                                                 // Zero the offset, as there's nothing there..
 512                                                 session->inbufoffset = 0;
 513                                         }
 514                                         return 1;
 515                                 }
 516                                 return ret;
 517                         }
 518                 }
 519
 520                 return -1;
 521         }
 522
 523         virtual int OnRawSocketWrite(int fd, const char* buffer, int count)
 524         {
 525                 /* Are there any possibilities of an out of range fd? Hope not, but lets be paranoid */
 526                 if ((fd < 0) || (fd > ServerInstance->SE->GetMaxFds() - 1))
 527                         return 0;
 528
 529                 errno = EAGAIN;
 530                 issl_session* session = &sessions[fd];
 531
 532                 if (!session->sess)
 533                 {
 534                         CloseSession(session);
 535                         return -1;
 536                 }
 537
 538                 session->outbuf.append(buffer, count);
 539                 MakePollWrite(session);
 540
 541                 if (session->status == ISSL_HANDSHAKING)
 542                 {
 543                         // The handshake isn't finished, try to finish it.
 544                         if (session->rstat == ISSL_WRITE || session->wstat == ISSL_WRITE)
 545                         {
 546                                 if (!Handshake(session))
 547                                 {
 548                                         // Couldn't resume handshake.
 549                                         errno = session->status == ISSL_NONE ? EIO : EAGAIN;
 550                                         return -1;
 551                                 }
 552                         }
 553                 }
 554
 555                 if (session->status == ISSL_OPEN)
 556                 {
 557                         if (session->rstat == ISSL_WRITE)
 558                         {
 559                                 DoRead(session);
 560                         }
 561
 562                         if (session->wstat == ISSL_WRITE)
 563                         {
 564                                 return DoWrite(session);
 565                         }
 566                 }
 567
 568                 return 1;
 569         }
 570
 571         int DoWrite(issl_session* session)
 572         {
 573                 if (!session->outbuf.size())
 574                         return -1;
 575
 576                 int ret = SSL_write(session->sess, session->outbuf.data(), session->outbuf.size());
 577
 578                 if (ret == 0)
 579                 {
 580                         CloseSession(session);
 581                         return 0;
 582                 }
 583                 else if (ret < 0)
 584                 {
 585                         int err = SSL_get_error(session->sess, ret);
 586
 587                         if (err == SSL_ERROR_WANT_WRITE)
 588                         {
 589                                 session->wstat = ISSL_WRITE;
 590                                 return -1;
 591                         }
 592                         else if (err == SSL_ERROR_WANT_READ)
 593                         {
 594                                 session->wstat = ISSL_READ;
 595                                 return -1;
 596                         }
 597                         else
 598                         {
 599                                 CloseSession(session);
 600                                 return 0;
 601                         }
 602                 }
 603                 else
 604                 {
 605                         session->outbuf = session->outbuf.substr(ret);
 606                         return ret;
 607                 }
 608         }
 609
 610         int DoRead(issl_session* session)
 611         {
 612                 // Is this right? Not sure if the unencrypted data is garaunteed to be the same length.
 613                 // Read into the inbuffer, offset from the beginning by the amount of data we have that insp hasn't taken yet.
 614
 615                 int ret = SSL_read(session->sess, session->inbuf + session->inbufoffset, inbufsize - session->inbufoffset);
 616
 617                 if (ret == 0)
 618                 {
 619                         // Client closed connection.
 620                         CloseSession(session);
 621                         return 0;
 622                 }
 623                 else if (ret < 0)
 624                 {
 625                         int err = SSL_get_error(session->sess, ret);
 626
 627                         if (err == SSL_ERROR_WANT_READ)
 628                         {
 629                                 session->rstat = ISSL_READ;
 630                                 return -1;
 631                         }
 632                         else if (err == SSL_ERROR_WANT_WRITE)
 633                         {
 634                                 session->rstat = ISSL_WRITE;
 635                                 MakePollWrite(session);
 636                                 return -1;
 637                         }
 638                         else
 639                         {
 640                                 CloseSession(session);
 641                                 return 0;
 642                         }
 643                 }
 644                 else
 645                 {
 646                         // Read successfully 'ret' bytes into inbuf + inbufoffset
 647                         // There are 'ret' + 'inbufoffset' bytes of data in 'inbuf'
 648                         // 'buffer' is 'count' long
 649
 650                         session->inbufoffset += ret;
 651
 652                         return ret;
 653                 }
 654         }
 655
 656         bool Handshake(issl_session* session)
 657         {
 658                 int ret;
 659
 660                 if (session->outbound)
 661                         ret = SSL_connect(session->sess);
 662                 else
 663                         ret = SSL_accept(session->sess);
 664
 665                 if (ret < 0)
 666                 {
 667                         int err = SSL_get_error(session->sess, ret);
 668
 669                         if (err == SSL_ERROR_WANT_READ)
 670                         {
 671                                 session->rstat = ISSL_READ;
 672                                 session->status = ISSL_HANDSHAKING;
 673                                 return true;
 674                         }
 675                         else if (err == SSL_ERROR_WANT_WRITE)
 676                         {
 677                                 session->wstat = ISSL_WRITE;
 678                                 session->status = ISSL_HANDSHAKING;
 679                                 MakePollWrite(session);
 680                                 return true;
 681                         }
 682                         else
 683                         {
 684                                 CloseSession(session);
 685                         }
 686
 687                         return false;
 688                 }
 689                 else if (ret > 0)
 690                 {
 691                         // Handshake complete.
 692                         // This will do for setting the ssl flag...it could be done earlier if it's needed. But this seems neater.
 693                         EventHandler *u = ServerInstance->SE->GetRef(session->fd);
 694                         if (u)
 695                         {
 696                                 u->Extend("ssl");
 697                         }
 698
 699                         session->status = ISSL_OPEN;
 700
 701                         MakePollWrite(session);
 702
 703                         return true;
 704                 }
 705                 else if (ret == 0)
 706                 {
 707                         CloseSession(session);
 708                         return true;
 709                 }
 710
 711                 return true;
 712         }
 713
 714         virtual void OnPostConnect(User* user)
 715         {
 716                 // This occurs AFTER OnUserConnect so we can be sure the
 717                 // protocol module has propagated the NICK message.
 718                 if ((user->GetIOHook() == this) && (IS_LOCAL(user)))
 719                 {
 720                         ssl_cert* certdata = VerifyCertificate(&sessions[user->GetFd()], user);
 721                         if (sessions[user->GetFd()].sess)
 722                                 user->WriteServ("NOTICE %s :*** You are connected using SSL cipher \"%s\"", user->nick.c_str(), SSL_get_cipher(sessions[user->GetFd()].sess));
 723
 724                         ServerInstance->PI->SendMetaData(user, "ssl", "ON");
 725                         if (certdata)
 726                                 ServerInstance->PI->SendMetaData(user, "ssl_cert", certdata->GetMetaLine().c_str());
 727                 }
 728         }
 729
 730         void MakePollWrite(issl_session* session)
 731         {
 732                 //OnRawSocketWrite(session->fd, NULL, 0);
 733                 EventHandler* eh = ServerInstance->SE->GetRef(session->fd);
 734                 if (eh)
 735                 {
 736                         ServerInstance->SE->WantWrite(eh);
 737                 }
 738         }
 739
 740         virtual void OnBufferFlushed(User* user)
 741         {
 742                 if (user->GetIOHook() == this)
 743                 {
 744                         issl_session* session = &sessions[user->GetFd()];
 745                         if (session && session->outbuf.size())
 746                                 OnRawSocketWrite(user->GetFd(), NULL, 0);
 747                 }
 748         }
 749
 750         void CloseSession(issl_session* session)
 751         {
 752                 if (session->sess)
 753                 {
 754                         SSL_shutdown(session->sess);
 755                         SSL_free(session->sess);
 756                 }
 757
 758                 if (session->inbuf)
 759                 {
 760                         delete[] session->inbuf;
 761                 }
 762
 763                 session->outbuf.clear();
 764                 session->inbuf = NULL;
 765                 session->sess = NULL;
 766                 session->status = ISSL_NONE;
 767                 errno = EIO;
 768         }
 769
 770         ssl_cert* VerifyCertificate(issl_session* session, Extensible* user)
 771         {
 772                 if (!session->sess || !user)
 773                         return NULL;
 774
 775                 X509* cert;
 776                 ssl_cert* certinfo = new ssl_cert;
 777                 unsigned int n;
 778                 unsigned char md[EVP_MAX_MD_SIZE];
 779                 const EVP_MD *digest = EVP_md5();
 780
 781                 user->Extend("ssl_cert",certinfo);
 782
 783                 cert = SSL_get_peer_certificate((SSL*)session->sess);
 784
 785                 if (!cert)
 786                 {
 787                         certinfo->error = "Could not get peer certificate: "+std::string(get_error());
 788                         return certinfo;
 789                 }
 790
 791                 certinfo->invalid = (SSL_get_verify_result(session->sess) != X509_V_OK);
 792
 793                 if (SelfSigned)
 794                 {
 795                         certinfo->unknownsigner = false;
 796                         certinfo->trusted = true;
 797                 }
 798                 else
 799                 {
 800                         certinfo->unknownsigner = true;
 801                         certinfo->trusted = false;
 802                 }
 803
 804                 certinfo->dn = X509_NAME_oneline(X509_get_subject_name(cert),0,0);
 805                 certinfo->issuer = X509_NAME_oneline(X509_get_issuer_name(cert),0,0);
 806
 807                 if (!X509_digest(cert, digest, md, &n))
 808                 {
 809                         certinfo->error = "Out of memory generating fingerprint";
 810                 }
 811                 else
 812                 {
 813                         certinfo->fingerprint = irc::hex(md, n);
 814                 }
 815
 816                 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))
 817                 {
 818                         certinfo->error = "Not activated, or expired certificate";
 819                 }
 820
 821                 X509_free(cert);
 822                 return certinfo;
 823         }
 824
 825         void Prioritize()
 826         {
 827                 Module* server = ServerInstance->Modules->Find("m_spanningtree.so");
 828                 ServerInstance->Modules->SetPriority(this, I_OnPostConnect, PRIORITY_AFTER, &server);
 829         }
 830
 831 };
 832
 833 static int error_callback(const char *str, size_t len, void *u)
 834 {
 835         ModuleSSLOpenSSL* mssl = (ModuleSSLOpenSSL*)u;
 836         mssl->PublicInstance->Logs->Log("m_ssl_openssl",DEFAULT, "SSL error: " + std::string(str, len - 1));
 837
 838         //
 839         // XXX: Remove this line, it causes valgrind warnings...
 840         //
 841         // MD_update(&m, buf, j);
 842         //
 843         //
 844         // ... ONLY JOKING! :-)
 845         //
 846
 847         return 0;
 848 }
 849
 850 MODULE_INIT(ModuleSSLOpenSSL)