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 bool isin(const std::string &host, int port, const std::vector<std::string> &portlist)
  44 {
  45         if (std::find(portlist.begin(), portlist.end(), "*:" + ConvToStr(port)) != portlist.end())
  46                 return true;
  47
  48         if (std::find(portlist.begin(), portlist.end(), ":" + ConvToStr(port)) != portlist.end())
  49                 return true;
  50
  51         return std::find(portlist.begin(), portlist.end(), host + ":" + ConvToStr(port)) != portlist.end();
  52 }
  53
  54 char* get_error()
  55 {
  56         return ERR_error_string(ERR_get_error(), NULL);
  57 }
  58
  59 static int error_callback(const char *str, size_t len, void *u);
  60
  61 /** Represents an SSL user's extra data
  62  */
  63 class issl_session : public classbase
  64 {
  65 public:
  66         SSL* sess;
  67         issl_status status;
  68         issl_io_status rstat;
  69         issl_io_status wstat;
  70
  71         unsigned int inbufoffset;
  72         char* inbuf;                    // Buffer OpenSSL reads into.
  73         std::string outbuf;     // Buffer for outgoing data that OpenSSL will not take.
  74         int fd;
  75         bool outbound;
  76
  77         issl_session()
  78         {
  79                 outbound = false;
  80                 rstat = ISSL_READ;
  81                 wstat = ISSL_WRITE;
  82         }
  83 };
  84
  85 static int OnVerify(int preverify_ok, X509_STORE_CTX *ctx)
  86 {
  87         /* XXX: This will allow self signed certificates.
  88          * In the future if we want an option to not allow this,
  89          * we can just return preverify_ok here, and openssl
  90          * will boot off self-signed and invalid peer certs.
  91          */
  92         int ve = X509_STORE_CTX_get_error(ctx);
  93
  94         SelfSigned = (ve == X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT);
  95
  96         return 1;
  97 }
  98
  99 class ModuleSSLOpenSSL : public Module
 100 {
 101         std::vector<std::string> listenports;
 102
 103         int inbufsize;
 104         issl_session* sessions;
 105
 106         SSL_CTX* ctx;
 107         SSL_CTX* clictx;
 108
 109         char* dummy;
 110         char cipher[MAXBUF];
 111
 112         std::string keyfile;
 113         std::string certfile;
 114         std::string cafile;
 115         // std::string crlfile;
 116         std::string dhfile;
 117         std::string sslports;
 118
 119         int clientactive;
 120
 121  public:
 122
 123         InspIRCd* PublicInstance;
 124
 125         ModuleSSLOpenSSL(InspIRCd* Me)
 126         : Module(Me), PublicInstance(Me)
 127         {
 128                 ServerInstance->Modules->PublishInterface("BufferedSocketHook", this);
 129
 130                 sessions = new issl_session[ServerInstance->SE->GetMaxFds()];
 131
 132                 // Not rehashable...because I cba to reduce all the sizes of existing buffers.
 133                 inbufsize = ServerInstance->Config->NetBufferSize;
 134
 135                 /* Global SSL library initialization*/
 136                 SSL_library_init();
 137                 SSL_load_error_strings();
 138
 139                 /* Build our SSL contexts:
 140                  * NOTE: OpenSSL makes us have two contexts, one for servers and one for clients. ICK.
 141                  */
 142                 ctx = SSL_CTX_new( SSLv23_server_method() );
 143                 clictx = SSL_CTX_new( SSLv23_client_method() );
 144
 145                 SSL_CTX_set_mode(ctx, SSL_MODE_ENABLE_PARTIAL_WRITE | SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER);
 146                 SSL_CTX_set_mode(clictx, SSL_MODE_ENABLE_PARTIAL_WRITE | SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER);
 147
 148                 SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER | SSL_VERIFY_CLIENT_ONCE, OnVerify);
 149                 SSL_CTX_set_verify(clictx, SSL_VERIFY_PEER | SSL_VERIFY_CLIENT_ONCE, OnVerify);
 150
 151                 // Needs the flag as it ignores a plain /rehash
 152                 OnRehash(NULL,"ssl");
 153                 Implementation eventlist[] = { I_OnRawSocketConnect, I_OnRawSocketAccept, I_OnRawSocketClose, I_OnRawSocketRead, I_OnRawSocketWrite, I_OnCleanup, I_On005Numeric,
 154                         I_OnBufferFlushed, I_OnRequest, I_OnSyncUserMetaData, I_OnDecodeMetaData, I_OnUnloadModule, I_OnRehash, I_OnWhois, I_OnPostConnect, I_OnHookUserIO };
 155                 ServerInstance->Modules->Attach(eventlist, this, 16);
 156         }
 157
 158         virtual void OnHookUserIO(User* user, const std::string &targetip)
 159         {
 160                 if (!user->GetIOHook() && isin(targetip,user->GetPort(), listenports))
 161                 {
 162                         /* Hook the user with our module */
 163                         user->AddIOHook(this);
 164                 }
 165         }
 166
 167         virtual void OnRehash(User* user, const std::string &param)
 168         {
 169                 ConfigReader Conf(ServerInstance);
 170
 171                 listenports.clear();
 172                 clientactive = 0;
 173                 sslports.clear();
 174
 175                 for(int index = 0; index < Conf.Enumerate("bind"); index++)
 176                 {
 177                         // For each <bind> tag
 178                         std::string x = Conf.ReadValue("bind", "type", index);
 179                         if(((x.empty()) || (x == "clients")) && (Conf.ReadValue("bind", "ssl", index) == "openssl"))
 180                         {
 181                                 // Get the port we're meant to be listening on with SSL
 182                                 std::string port = Conf.ReadValue("bind", "port", index);
 183                                 std::string addr = Conf.ReadValue("bind", "address", index);
 184
 185                                 if (!addr.empty())
 186                                 {
 187                                         // normalize address, important for IPv6
 188                                         int portint = 0;
 189                                         irc::sockets::sockaddrs bin;
 190                                         if (irc::sockets::aptosa(addr.c_str(), portint, &bin))
 191                                                 irc::sockets::satoap(&bin, addr, portint);
 192                                 }
 193
 194                                 irc::portparser portrange(port, false);
 195                                 long portno = -1;
 196                                 while ((portno = portrange.GetToken()))
 197                                 {
 198                                         clientactive++;
 199                                         try
 200                                         {
 201                                                 listenports.push_back(addr + ":" + ConvToStr(portno));
 202
 203                                                 for (size_t i = 0; i < ServerInstance->Config->ports.size(); i++)
 204                                                         if ((ServerInstance->Config->ports[i]->GetPort() == portno) && (ServerInstance->Config->ports[i]->GetIP() == addr))
 205                                                                 ServerInstance->Config->ports[i]->SetDescription("ssl");
 206                                                 ServerInstance->Logs->Log("m_ssl_openssl",DEFAULT, "m_ssl_openssl.so: Enabling SSL for port %ld", portno);
 207
 208                                                 sslports.append((addr.empty() ? "*" : addr)).append(":").append(ConvToStr(portno)).append(";");
 209                                         }
 210                                         catch (ModuleException &e)
 211                                         {
 212                                                 ServerInstance->Logs->Log("m_ssl_openssl",DEFAULT, "m_ssl_openssl.so: FAILED to enable SSL on port %ld: %s. Maybe it's already hooked by the same port on a different IP, or you have an other SSL or similar module loaded?", portno, e.GetReason());
 213                                         }
 214                                 }
 215                         }
 216                 }
 217
 218                 if (!sslports.empty())
 219                         sslports.erase(sslports.end() - 1);
 220
 221                 if (param != "ssl")
 222                 {
 223                         return;
 224                 }
 225
 226                 std::string confdir(ServerInstance->ConfigFileName);
 227                 // +1 so we the path ends with a /
 228                 confdir = confdir.substr(0, confdir.find_last_of('/') + 1);
 229
 230                 cafile   = Conf.ReadValue("openssl", "cafile", 0);
 231                 certfile = Conf.ReadValue("openssl", "certfile", 0);
 232                 keyfile  = Conf.ReadValue("openssl", "keyfile", 0);
 233                 dhfile   = Conf.ReadValue("openssl", "dhfile", 0);
 234
 235                 // Set all the default values needed.
 236                 if (cafile.empty())
 237                         cafile = "ca.pem";
 238
 239                 if (certfile.empty())
 240                         certfile = "cert.pem";
 241
 242                 if (keyfile.empty())
 243                         keyfile = "key.pem";
 244
 245                 if (dhfile.empty())
 246                         dhfile = "dhparams.pem";
 247
 248                 // Prepend relative paths with the path to the config directory.
 249                 if ((cafile[0] != '/') && (!ServerInstance->Config->StartsWithWindowsDriveLetter(cafile)))
 250                         cafile = confdir + cafile;
 251
 252                 if ((certfile[0] != '/') && (!ServerInstance->Config->StartsWithWindowsDriveLetter(certfile)))
 253                         certfile = confdir + certfile;
 254
 255                 if ((keyfile[0] != '/') && (!ServerInstance->Config->StartsWithWindowsDriveLetter(keyfile)))
 256                         keyfile = confdir + keyfile;
 257
 258                 if ((dhfile[0] != '/') && (!ServerInstance->Config->StartsWithWindowsDriveLetter(dhfile)))
 259                         dhfile = confdir + dhfile;
 260
 261                 /* Load our keys and certificates
 262                  * NOTE: OpenSSL's error logging API sucks, don't blame us for this clusterfuck.
 263                  */
 264                 if ((!SSL_CTX_use_certificate_chain_file(ctx, certfile.c_str())) || (!SSL_CTX_use_certificate_chain_file(clictx, certfile.c_str())))
 265                 {
 266                         ServerInstance->Logs->Log("m_ssl_openssl",DEFAULT, "m_ssl_openssl.so: Can't read certificate file %s. %s", certfile.c_str(), strerror(errno));
 267                         ERR_print_errors_cb(error_callback, this);
 268                 }
 269
 270                 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)))
 271                 {
 272                         ServerInstance->Logs->Log("m_ssl_openssl",DEFAULT, "m_ssl_openssl.so: Can't read key file %s. %s", keyfile.c_str(), strerror(errno));
 273                         ERR_print_errors_cb(error_callback, this);
 274                 }
 275
 276                 /* Load the CAs we trust*/
 277                 if (((!SSL_CTX_load_verify_locations(ctx, cafile.c_str(), 0))) || (!SSL_CTX_load_verify_locations(clictx, cafile.c_str(), 0)))
 278                 {
 279                         ServerInstance->Logs->Log("m_ssl_openssl",DEFAULT, "m_ssl_openssl.so: Can't read CA list from %s. %s", cafile.c_str(), strerror(errno));
 280                         ERR_print_errors_cb(error_callback, this);
 281                 }
 282
 283                 FILE* dhpfile = fopen(dhfile.c_str(), "r");
 284                 DH* ret;
 285
 286                 if (dhpfile == NULL)
 287                 {
 288                         ServerInstance->Logs->Log("m_ssl_openssl",DEFAULT, "m_ssl_openssl.so Couldn't open DH file %s: %s", dhfile.c_str(), strerror(errno));
 289                         throw ModuleException("Couldn't open DH file " + dhfile + ": " + strerror(errno));
 290                 }
 291                 else
 292                 {
 293                         ret = PEM_read_DHparams(dhpfile, NULL, NULL, NULL);
 294                         if ((SSL_CTX_set_tmp_dh(ctx, ret) < 0) || (SSL_CTX_set_tmp_dh(clictx, ret) < 0))
 295                         {
 296                                 ServerInstance->Logs->Log("m_ssl_openssl",DEFAULT, "m_ssl_openssl.so: Couldn't set DH parameters %s. SSL errors follow:", dhfile.c_str());
 297                                 ERR_print_errors_cb(error_callback, this);
 298                         }
 299                 }
 300
 301                 fclose(dhpfile);
 302         }
 303
 304         virtual void On005Numeric(std::string &output)
 305         {
 306                 output.append(" SSL=" + sslports);
 307         }
 308
 309         virtual ~ModuleSSLOpenSSL()
 310         {
 311                 SSL_CTX_free(ctx);
 312                 SSL_CTX_free(clictx);
 313                 ServerInstance->Modules->UnpublishInterface("BufferedSocketHook", this);
 314                 delete[] sessions;
 315         }
 316
 317         virtual void OnCleanup(int target_type, void* item)
 318         {
 319                 if (target_type == TYPE_USER)
 320                 {
 321                         User* user = (User*)item;
 322
 323                         if (user->GetIOHook() == this)
 324                         {
 325                                 // User is using SSL, they're a local user, and they're using one of *our* SSL ports.
 326                                 // Potentially there could be multiple SSL modules loaded at once on different ports.
 327                                 ServerInstance->Users->QuitUser(user, "SSL module unloading");
 328                                 user->DelIOHook();
 329                         }
 330                         if (user->GetExt("ssl_cert", dummy))
 331                         {
 332                                 ssl_cert* tofree;
 333                                 user->GetExt("ssl_cert", tofree);
 334                                 delete tofree;
 335                                 user->Shrink("ssl_cert");
 336                         }
 337                 }
 338         }
 339
 340         virtual void OnUnloadModule(Module* mod, const std::string &name)
 341         {
 342                 if (mod == this)
 343                 {
 344                         for(unsigned int i = 0; i < listenports.size(); i++)
 345                         {
 346                                 for (size_t j = 0; j < ServerInstance->Config->ports.size(); j++)
 347                                         if (listenports[i] == (ServerInstance->Config->ports[j]->GetIP()+":"+ConvToStr(ServerInstance->Config->ports[j]->GetPort())))
 348                                                 ServerInstance->Config->ports[j]->SetDescription("plaintext");
 349                         }
 350                 }
 351         }
 352
 353         virtual Version GetVersion()
 354         {
 355                 return Version("$Id$", VF_VENDOR, API_VERSION);
 356         }
 357
 358
 359         virtual const char* OnRequest(Request* request)
 360         {
 361                 ISHRequest* ISR = (ISHRequest*)request;
 362                 if (strcmp("IS_NAME", request->GetId()) == 0)
 363                 {
 364                         return "openssl";
 365                 }
 366                 else if (strcmp("IS_HOOK", request->GetId()) == 0)
 367                 {
 368                         const char* ret = "OK";
 369                         try
 370                         {
 371                                 ret = ISR->Sock->AddIOHook((Module*)this) ? "OK" : NULL;
 372                         }
 373                         catch (ModuleException &e)
 374                         {
 375                                 return NULL;
 376                         }
 377
 378                         return ret;
 379                 }
 380                 else if (strcmp("IS_UNHOOK", request->GetId()) == 0)
 381                 {
 382                         return ISR->Sock->DelIOHook() ? "OK" : NULL;
 383                 }
 384                 else if (strcmp("IS_HSDONE", request->GetId()) == 0)
 385                 {
 386                         if (ISR->Sock->GetFd() < 0)
 387                                 return "OK";
 388
 389                         issl_session* session = &sessions[ISR->Sock->GetFd()];
 390                         return (session->status == ISSL_HANDSHAKING) ? NULL : "OK";
 391                 }
 392                 else if (strcmp("IS_ATTACH", request->GetId()) == 0)
 393                 {
 394                         issl_session* session = &sessions[ISR->Sock->GetFd()];
 395                         if (session->sess)
 396                         {
 397                                 VerifyCertificate(session, (BufferedSocket*)ISR->Sock);
 398                                 return "OK";
 399                         }
 400                 }
 401                 return NULL;
 402         }
 403
 404
 405         virtual void OnRawSocketAccept(int fd, const std::string &ip, int localport)
 406         {
 407                 /* Are there any possibilities of an out of range fd? Hope not, but lets be paranoid */
 408                 if ((fd < 0) || (fd > ServerInstance->SE->GetMaxFds() - 1))
 409                         return;
 410
 411                 issl_session* session = &sessions[fd];
 412
 413                 session->fd = fd;
 414                 session->inbuf = new char[inbufsize];
 415                 session->inbufoffset = 0;
 416                 session->sess = SSL_new(ctx);
 417                 session->status = ISSL_NONE;
 418                 session->outbound = false;
 419
 420                 if (session->sess == NULL)
 421                         return;
 422
 423                 if (SSL_set_fd(session->sess, fd) == 0)
 424                 {
 425                         ServerInstance->Logs->Log("m_ssl_openssl",DEBUG,"BUG: Can't set fd with SSL_set_fd: %d", fd);
 426                         return;
 427                 }
 428
 429                 Handshake(session);
 430         }
 431
 432         virtual void OnRawSocketConnect(int fd)
 433         {
 434                 /* Are there any possibilities of an out of range fd? Hope not, but lets be paranoid */
 435                 if ((fd < 0) || (fd > ServerInstance->SE->GetMaxFds() -1))
 436                         return;
 437
 438                 issl_session* session = &sessions[fd];
 439
 440                 session->fd = fd;
 441                 session->inbuf = new char[inbufsize];
 442                 session->inbufoffset = 0;
 443                 session->sess = SSL_new(clictx);
 444                 session->status = ISSL_NONE;
 445                 session->outbound = true;
 446
 447                 if (session->sess == NULL)
 448                         return;
 449
 450                 if (SSL_set_fd(session->sess, fd) == 0)
 451                 {
 452                         ServerInstance->Logs->Log("m_ssl_openssl",DEBUG,"BUG: Can't set fd with SSL_set_fd: %d", fd);
 453                         return;
 454                 }
 455
 456                 Handshake(session);
 457         }
 458
 459         virtual void OnRawSocketClose(int fd)
 460         {
 461                 /* Are there any possibilities of an out of range fd? Hope not, but lets be paranoid */
 462                 if ((fd < 0) || (fd > ServerInstance->SE->GetMaxFds() - 1))
 463                         return;
 464
 465                 CloseSession(&sessions[fd]);
 466
 467                 EventHandler* user = ServerInstance->SE->GetRef(fd);
 468
 469                 if ((user) && (user->GetExt("ssl_cert", dummy)))
 470                 {
 471                         ssl_cert* tofree;
 472                         user->GetExt("ssl_cert", tofree);
 473                         delete tofree;
 474                         user->Shrink("ssl_cert");
 475                 }
 476         }
 477
 478         virtual int OnRawSocketRead(int fd, char* buffer, unsigned int count, int &readresult)
 479         {
 480                 /* Are there any possibilities of an out of range fd? Hope not, but lets be paranoid */
 481                 if ((fd < 0) || (fd > ServerInstance->SE->GetMaxFds() - 1))
 482                         return 0;
 483
 484                 issl_session* session = &sessions[fd];
 485
 486                 if (!session->sess)
 487                 {
 488                         readresult = 0;
 489                         CloseSession(session);
 490                         return 1;
 491                 }
 492
 493                 if (session->status == ISSL_HANDSHAKING)
 494                 {
 495                         if (session->rstat == ISSL_READ || session->wstat == ISSL_READ)
 496                         {
 497                                 // The handshake isn't finished and it wants to read, try to finish it.
 498                                 if (!Handshake(session))
 499                                 {
 500                                         // Couldn't resume handshake.
 501                                         return -1;
 502                                 }
 503                         }
 504                         else
 505                         {
 506                                 errno = EAGAIN;
 507                                 return -1;
 508                         }
 509                 }
 510
 511                 // If we resumed the handshake then session->status will be ISSL_OPEN
 512
 513                 if (session->status == ISSL_OPEN)
 514                 {
 515                         if (session->wstat == ISSL_READ)
 516                         {
 517                                 if(DoWrite(session) == 0)
 518                                         return 0;
 519                         }
 520
 521                         if (session->rstat == ISSL_READ)
 522                         {
 523                                 int ret = DoRead(session);
 524
 525                                 if (ret > 0)
 526                                 {
 527                                         if (count <= session->inbufoffset)
 528                                         {
 529                                                 memcpy(buffer, session->inbuf, count);
 530                                                 // Move the stuff left in inbuf to the beginning of it
 531                                                 memmove(session->inbuf, session->inbuf + count, (session->inbufoffset - count));
 532                                                 // Now we need to set session->inbufoffset to the amount of data still waiting to be handed to insp.
 533                                                 session->inbufoffset -= count;
 534                                                 // Insp uses readresult as the count of how much data there is in buffer, so:
 535                                                 readresult = count;
 536                                         }
 537                                         else
 538                                         {
 539                                                 // There's not as much in the inbuf as there is space in the buffer, so just copy the whole thing.
 540                                                 memcpy(buffer, session->inbuf, session->inbufoffset);
 541
 542                                                 readresult = session->inbufoffset;
 543                                                 // Zero the offset, as there's nothing there..
 544                                                 session->inbufoffset = 0;
 545                                         }
 546                                         return 1;
 547                                 }
 548                                 return ret;
 549                         }
 550                 }
 551
 552                 return -1;
 553         }
 554
 555         virtual int OnRawSocketWrite(int fd, const char* buffer, int count)
 556         {
 557                 /* Are there any possibilities of an out of range fd? Hope not, but lets be paranoid */
 558                 if ((fd < 0) || (fd > ServerInstance->SE->GetMaxFds() - 1))
 559                         return 0;
 560
 561                 issl_session* session = &sessions[fd];
 562
 563                 if (!session->sess)
 564                 {
 565                         CloseSession(session);
 566                         return -1;
 567                 }
 568
 569                 session->outbuf.append(buffer, count);
 570                 MakePollWrite(session);
 571
 572                 if (session->status == ISSL_HANDSHAKING)
 573                 {
 574                         // The handshake isn't finished, try to finish it.
 575                         if (session->rstat == ISSL_WRITE || session->wstat == ISSL_WRITE)
 576                         {
 577                                 Handshake(session);
 578                         }
 579                 }
 580
 581                 if (session->status == ISSL_OPEN)
 582                 {
 583                         if (session->rstat == ISSL_WRITE)
 584                         {
 585                                 DoRead(session);
 586                         }
 587
 588                         if (session->wstat == ISSL_WRITE)
 589                         {
 590                                 return DoWrite(session);
 591                         }
 592                 }
 593
 594                 return 1;
 595         }
 596
 597         int DoWrite(issl_session* session)
 598         {
 599                 if (!session->outbuf.size())
 600                         return -1;
 601
 602                 int ret = SSL_write(session->sess, session->outbuf.data(), session->outbuf.size());
 603
 604                 if (ret == 0)
 605                 {
 606                         CloseSession(session);
 607                         return 0;
 608                 }
 609                 else if (ret < 0)
 610                 {
 611                         int err = SSL_get_error(session->sess, ret);
 612
 613                         if (err == SSL_ERROR_WANT_WRITE)
 614                         {
 615                                 session->wstat = ISSL_WRITE;
 616                                 return -1;
 617                         }
 618                         else if (err == SSL_ERROR_WANT_READ)
 619                         {
 620                                 session->wstat = ISSL_READ;
 621                                 return -1;
 622                         }
 623                         else
 624                         {
 625                                 CloseSession(session);
 626                                 return 0;
 627                         }
 628                 }
 629                 else
 630                 {
 631                         session->outbuf = session->outbuf.substr(ret);
 632                         return ret;
 633                 }
 634         }
 635
 636         int DoRead(issl_session* session)
 637         {
 638                 // Is this right? Not sure if the unencrypted data is garaunteed to be the same length.
 639                 // Read into the inbuffer, offset from the beginning by the amount of data we have that insp hasn't taken yet.
 640
 641                 int ret = SSL_read(session->sess, session->inbuf + session->inbufoffset, inbufsize - session->inbufoffset);
 642
 643                 if (ret == 0)
 644                 {
 645                         // Client closed connection.
 646                         CloseSession(session);
 647                         return 0;
 648                 }
 649                 else if (ret < 0)
 650                 {
 651                         int err = SSL_get_error(session->sess, ret);
 652
 653                         if (err == SSL_ERROR_WANT_READ)
 654                         {
 655                                 session->rstat = ISSL_READ;
 656                                 return -1;
 657                         }
 658                         else if (err == SSL_ERROR_WANT_WRITE)
 659                         {
 660                                 session->rstat = ISSL_WRITE;
 661                                 MakePollWrite(session);
 662                                 return -1;
 663                         }
 664                         else
 665                         {
 666                                 CloseSession(session);
 667                                 return 0;
 668                         }
 669                 }
 670                 else
 671                 {
 672                         // Read successfully 'ret' bytes into inbuf + inbufoffset
 673                         // There are 'ret' + 'inbufoffset' bytes of data in 'inbuf'
 674                         // 'buffer' is 'count' long
 675
 676                         session->inbufoffset += ret;
 677
 678                         return ret;
 679                 }
 680         }
 681
 682         // :kenny.chatspike.net 320 Om Epy|AFK :is a Secure Connection
 683         virtual void OnWhois(User* source, User* dest)
 684         {
 685                 if (!clientactive)
 686                         return;
 687
 688                 // Bugfix, only send this numeric for *our* SSL users
 689                 if (dest->GetExt("ssl", dummy))
 690                 {
 691                         ServerInstance->SendWhoisLine(source, dest, 320, "%s %s :is using a secure connection", source->nick.c_str(), dest->nick.c_str());
 692                 }
 693         }
 694
 695         virtual void OnSyncUserMetaData(User* user, Module* proto, void* opaque, const std::string &extname, bool displayable)
 696         {
 697                 // check if the linking module wants to know about OUR metadata
 698                 if (extname == "ssl")
 699                 {
 700                         // check if this user has an swhois field to send
 701                         if(user->GetExt(extname, dummy))
 702                         {
 703                                 // call this function in the linking module, let it format the data how it
 704                                 // sees fit, and send it on its way. We dont need or want to know how.
 705                                 proto->ProtoSendMetaData(opaque, TYPE_USER, user, extname, displayable ? "Enabled" : "ON");
 706                         }
 707                 }
 708         }
 709
 710         virtual void OnDecodeMetaData(int target_type, void* target, const std::string &extname, const std::string &extdata)
 711         {
 712                 // check if its our metadata key, and its associated with a user
 713                 if ((target_type == TYPE_USER) && (extname == "ssl"))
 714                 {
 715                         User* dest = (User*)target;
 716                         // if they dont already have an ssl flag, accept the remote server's
 717                         if (!dest->GetExt(extname, dummy))
 718                         {
 719                                 dest->Extend(extname, "ON");
 720                         }
 721                 }
 722         }
 723
 724         bool Handshake(issl_session* session)
 725         {
 726                 int ret;
 727
 728                 if (session->outbound)
 729                         ret = SSL_connect(session->sess);
 730                 else
 731                         ret = SSL_accept(session->sess);
 732
 733                 if (ret < 0)
 734                 {
 735                         int err = SSL_get_error(session->sess, ret);
 736
 737                         if (err == SSL_ERROR_WANT_READ)
 738                         {
 739                                 session->rstat = ISSL_READ;
 740                                 session->status = ISSL_HANDSHAKING;
 741                                 return true;
 742                         }
 743                         else if (err == SSL_ERROR_WANT_WRITE)
 744                         {
 745                                 session->wstat = ISSL_WRITE;
 746                                 session->status = ISSL_HANDSHAKING;
 747                                 MakePollWrite(session);
 748                                 return true;
 749                         }
 750                         else
 751                         {
 752                                 CloseSession(session);
 753                         }
 754
 755                         return false;
 756                 }
 757                 else if (ret > 0)
 758                 {
 759                         // Handshake complete.
 760                         // This will do for setting the ssl flag...it could be done earlier if it's needed. But this seems neater.
 761                         EventHandler *u = ServerInstance->SE->GetRef(session->fd);
 762                         if (u)
 763                         {
 764                                 if (!u->GetExt("ssl", dummy))
 765                                         u->Extend("ssl", "ON");
 766                         }
 767
 768                         session->status = ISSL_OPEN;
 769
 770                         MakePollWrite(session);
 771
 772                         return true;
 773                 }
 774                 else if (ret == 0)
 775                 {
 776                         CloseSession(session);
 777                         return true;
 778                 }
 779
 780                 return true;
 781         }
 782
 783         virtual void OnPostConnect(User* user)
 784         {
 785                 // This occurs AFTER OnUserConnect so we can be sure the
 786                 // protocol module has propagated the NICK message.
 787                 if ((user->GetIOHook() == this) && (IS_LOCAL(user)))
 788                 {
 789                         // Tell whatever protocol module we're using that we need to inform other servers of this metadata NOW.
 790                         ServerInstance->PI->SendMetaData(user, TYPE_USER, "ssl", "on");
 791
 792                         VerifyCertificate(&sessions[user->GetFd()], user);
 793                         if (sessions[user->GetFd()].sess)
 794                                 user->WriteServ("NOTICE %s :*** You are connected using SSL cipher \"%s\"", user->nick.c_str(), SSL_get_cipher(sessions[user->GetFd()].sess));
 795                 }
 796         }
 797
 798         void MakePollWrite(issl_session* session)
 799         {
 800                 //OnRawSocketWrite(session->fd, NULL, 0);
 801                 EventHandler* eh = ServerInstance->SE->GetRef(session->fd);
 802                 if (eh)
 803                 {
 804                         ServerInstance->SE->WantWrite(eh);
 805                 }
 806         }
 807
 808         virtual void OnBufferFlushed(User* user)
 809         {
 810                 if (user->GetIOHook() == this)
 811                 {
 812                         issl_session* session = &sessions[user->GetFd()];
 813                         if (session && session->outbuf.size())
 814                                 OnRawSocketWrite(user->GetFd(), NULL, 0);
 815                 }
 816         }
 817
 818         void CloseSession(issl_session* session)
 819         {
 820                 if (session->sess)
 821                 {
 822                         SSL_shutdown(session->sess);
 823                         SSL_free(session->sess);
 824                 }
 825
 826                 if (session->inbuf)
 827                 {
 828                         delete[] session->inbuf;
 829                 }
 830
 831                 session->outbuf.clear();
 832                 session->inbuf = NULL;
 833                 session->sess = NULL;
 834                 session->status = ISSL_NONE;
 835         }
 836
 837         void VerifyCertificate(issl_session* session, Extensible* user)
 838         {
 839                 if (!session->sess || !user)
 840                         return;
 841
 842                 X509* cert;
 843                 ssl_cert* certinfo = new ssl_cert;
 844                 unsigned int n;
 845                 unsigned char md[EVP_MAX_MD_SIZE];
 846                 const EVP_MD *digest = EVP_md5();
 847
 848                 user->Extend("ssl_cert",certinfo);
 849
 850                 cert = SSL_get_peer_certificate((SSL*)session->sess);
 851
 852                 if (!cert)
 853                 {
 854                         certinfo->data.insert(std::make_pair("error","Could not get peer certificate: "+std::string(get_error())));
 855                         return;
 856                 }
 857
 858                 certinfo->data.insert(std::make_pair("invalid", SSL_get_verify_result(session->sess) != X509_V_OK ? ConvToStr(1) : ConvToStr(0)));
 859
 860                 if (SelfSigned)
 861                 {
 862                         certinfo->data.insert(std::make_pair("unknownsigner",ConvToStr(0)));
 863                         certinfo->data.insert(std::make_pair("trusted",ConvToStr(1)));
 864                 }
 865                 else
 866                 {
 867                         certinfo->data.insert(std::make_pair("unknownsigner",ConvToStr(1)));
 868                         certinfo->data.insert(std::make_pair("trusted",ConvToStr(0)));
 869                 }
 870
 871                 certinfo->data.insert(std::make_pair("dn",std::string(X509_NAME_oneline(X509_get_subject_name(cert),0,0))));
 872                 certinfo->data.insert(std::make_pair("issuer",std::string(X509_NAME_oneline(X509_get_issuer_name(cert),0,0))));
 873
 874                 if (!X509_digest(cert, digest, md, &n))
 875                 {
 876                         certinfo->data.insert(std::make_pair("error","Out of memory generating fingerprint"));
 877                 }
 878                 else
 879                 {
 880                         certinfo->data.insert(std::make_pair("fingerprint",irc::hex(md, n)));
 881                 }
 882
 883                 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))
 884                 {
 885                         certinfo->data.insert(std::make_pair("error","Not activated, or expired certificate"));
 886                 }
 887
 888                 X509_free(cert);
 889         }
 890
 891         void Prioritize()
 892         {
 893                 Module* server = ServerInstance->Modules->Find("m_spanningtree.so");
 894                 ServerInstance->Modules->SetPriority(this, I_OnPostConnect, PRIORITY_AFTER, &server);
 895         }
 896
 897 };
 898
 899 static int error_callback(const char *str, size_t len, void *u)
 900 {
 901         ModuleSSLOpenSSL* mssl = (ModuleSSLOpenSSL*)u;
 902         mssl->PublicInstance->Logs->Log("m_ssl_openssl",DEFAULT, "SSL error: " + std::string(str, len - 1));
 903
 904         //
 905         // XXX: Remove this line, it causes valgrind warnings...
 906         //
 907         // MD_update(&m, buf, j);
 908         //
 909         //
 910         // ... ONLY JOKING! :-)
 911         //
 912
 913         return 0;
 914 }
 915
 916 MODULE_INIT(ModuleSSLOpenSSL)