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                 OnModuleRehash(NULL,"ssl");
 153                 Implementation eventlist[] = { I_OnRawSocketConnect, I_OnRawSocketAccept,
 154                         I_OnRawSocketClose, I_OnRawSocketRead, I_OnRawSocketWrite, I_OnCleanup, I_On005Numeric,
 155                         I_OnBufferFlushed, I_OnRequest, I_OnSyncUserMetaData, I_OnDecodeMetaData,
 156                         I_OnUnloadModule, I_OnRehash, I_OnModuleRehash, I_OnWhois, I_OnPostConnect,
 157                         I_OnHookUserIO };
 158                 ServerInstance->Modules->Attach(eventlist, this, 17);
 159         }
 160
 161         virtual void OnHookUserIO(User* user, const std::string &targetip)
 162         {
 163                 if (!user->GetIOHook() && isin(targetip,user->GetPort(), listenports))
 164                 {
 165                         /* Hook the user with our module */
 166                         user->AddIOHook(this);
 167                 }
 168         }
 169
 170         virtual void OnRehash(User* user)
 171         {
 172                 ConfigReader Conf(ServerInstance);
 173
 174                 listenports.clear();
 175                 clientactive = 0;
 176                 sslports.clear();
 177
 178                 for(int index = 0; index < Conf.Enumerate("bind"); index++)
 179                 {
 180                         // For each <bind> tag
 181                         std::string x = Conf.ReadValue("bind", "type", index);
 182                         if(((x.empty()) || (x == "clients")) && (Conf.ReadValue("bind", "ssl", index) == "openssl"))
 183                         {
 184                                 // Get the port we're meant to be listening on with SSL
 185                                 std::string port = Conf.ReadValue("bind", "port", index);
 186                                 std::string addr = Conf.ReadValue("bind", "address", index);
 187
 188                                 if (!addr.empty())
 189                                 {
 190                                         // normalize address, important for IPv6
 191                                         int portint = 0;
 192                                         irc::sockets::sockaddrs bin;
 193                                         if (irc::sockets::aptosa(addr.c_str(), portint, &bin))
 194                                                 irc::sockets::satoap(&bin, addr, portint);
 195                                 }
 196
 197                                 irc::portparser portrange(port, false);
 198                                 long portno = -1;
 199                                 while ((portno = portrange.GetToken()))
 200                                 {
 201                                         clientactive++;
 202                                         try
 203                                         {
 204                                                 listenports.push_back(addr + ":" + ConvToStr(portno));
 205
 206                                                 for (size_t i = 0; i < ServerInstance->Config->ports.size(); i++)
 207                                                         if ((ServerInstance->Config->ports[i]->GetPort() == portno) && (ServerInstance->Config->ports[i]->GetIP() == addr))
 208                                                                 ServerInstance->Config->ports[i]->SetDescription("ssl");
 209                                                 ServerInstance->Logs->Log("m_ssl_openssl",DEFAULT, "m_ssl_openssl.so: Enabling SSL for port %ld", portno);
 210
 211                                                 if (addr != "127.0.0.1")
 212                                                         sslports.append((addr.empty() ? "*" : addr)).append(":").append(ConvToStr(portno)).append(";");
 213                                         }
 214                                         catch (ModuleException &e)
 215                                         {
 216                                                 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());
 217                                         }
 218                                 }
 219                         }
 220                 }
 221
 222                 if (!sslports.empty())
 223                         sslports.erase(sslports.end() - 1);
 224         }
 225
 226         virtual void OnModuleRehash(User* user, const std::string &param)
 227         {
 228                 if (param != "ssl")
 229                         return;
 230
 231                 OnRehash(user);
 232
 233                 ConfigReader Conf(ServerInstance);
 234
 235                 std::string confdir(ServerInstance->ConfigFileName);
 236                 // +1 so we the path ends with a /
 237                 confdir = confdir.substr(0, confdir.find_last_of('/') + 1);
 238
 239                 cafile   = Conf.ReadValue("openssl", "cafile", 0);
 240                 certfile = Conf.ReadValue("openssl", "certfile", 0);
 241                 keyfile  = Conf.ReadValue("openssl", "keyfile", 0);
 242                 dhfile   = Conf.ReadValue("openssl", "dhfile", 0);
 243
 244                 // Set all the default values needed.
 245                 if (cafile.empty())
 246                         cafile = "ca.pem";
 247
 248                 if (certfile.empty())
 249                         certfile = "cert.pem";
 250
 251                 if (keyfile.empty())
 252                         keyfile = "key.pem";
 253
 254                 if (dhfile.empty())
 255                         dhfile = "dhparams.pem";
 256
 257                 // Prepend relative paths with the path to the config directory.
 258                 if ((cafile[0] != '/') && (!ServerInstance->Config->StartsWithWindowsDriveLetter(cafile)))
 259                         cafile = confdir + cafile;
 260
 261                 if ((certfile[0] != '/') && (!ServerInstance->Config->StartsWithWindowsDriveLetter(certfile)))
 262                         certfile = confdir + certfile;
 263
 264                 if ((keyfile[0] != '/') && (!ServerInstance->Config->StartsWithWindowsDriveLetter(keyfile)))
 265                         keyfile = confdir + keyfile;
 266
 267                 if ((dhfile[0] != '/') && (!ServerInstance->Config->StartsWithWindowsDriveLetter(dhfile)))
 268                         dhfile = confdir + dhfile;
 269
 270                 /* Load our keys and certificates
 271                  * NOTE: OpenSSL's error logging API sucks, don't blame us for this clusterfuck.
 272                  */
 273                 if ((!SSL_CTX_use_certificate_chain_file(ctx, certfile.c_str())) || (!SSL_CTX_use_certificate_chain_file(clictx, certfile.c_str())))
 274                 {
 275                         ServerInstance->Logs->Log("m_ssl_openssl",DEFAULT, "m_ssl_openssl.so: Can't read certificate file %s. %s", certfile.c_str(), strerror(errno));
 276                         ERR_print_errors_cb(error_callback, this);
 277                 }
 278
 279                 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)))
 280                 {
 281                         ServerInstance->Logs->Log("m_ssl_openssl",DEFAULT, "m_ssl_openssl.so: Can't read key file %s. %s", keyfile.c_str(), strerror(errno));
 282                         ERR_print_errors_cb(error_callback, this);
 283                 }
 284
 285                 /* Load the CAs we trust*/
 286                 if (((!SSL_CTX_load_verify_locations(ctx, cafile.c_str(), 0))) || (!SSL_CTX_load_verify_locations(clictx, cafile.c_str(), 0)))
 287                 {
 288                         ServerInstance->Logs->Log("m_ssl_openssl",DEFAULT, "m_ssl_openssl.so: Can't read CA list from %s. %s", cafile.c_str(), strerror(errno));
 289                         ERR_print_errors_cb(error_callback, this);
 290                 }
 291
 292                 FILE* dhpfile = fopen(dhfile.c_str(), "r");
 293                 DH* ret;
 294
 295                 if (dhpfile == NULL)
 296                 {
 297                         ServerInstance->Logs->Log("m_ssl_openssl",DEFAULT, "m_ssl_openssl.so Couldn't open DH file %s: %s", dhfile.c_str(), strerror(errno));
 298                         throw ModuleException("Couldn't open DH file " + dhfile + ": " + strerror(errno));
 299                 }
 300                 else
 301                 {
 302                         ret = PEM_read_DHparams(dhpfile, NULL, NULL, NULL);
 303                         if ((SSL_CTX_set_tmp_dh(ctx, ret) < 0) || (SSL_CTX_set_tmp_dh(clictx, ret) < 0))
 304                         {
 305                                 ServerInstance->Logs->Log("m_ssl_openssl",DEFAULT, "m_ssl_openssl.so: Couldn't set DH parameters %s. SSL errors follow:", dhfile.c_str());
 306                                 ERR_print_errors_cb(error_callback, this);
 307                         }
 308                 }
 309
 310                 fclose(dhpfile);
 311         }
 312
 313         virtual void On005Numeric(std::string &output)
 314         {
 315                 output.append(" SSL=" + sslports);
 316         }
 317
 318         virtual ~ModuleSSLOpenSSL()
 319         {
 320                 SSL_CTX_free(ctx);
 321                 SSL_CTX_free(clictx);
 322                 ServerInstance->Modules->UnpublishInterface("BufferedSocketHook", this);
 323                 delete[] sessions;
 324         }
 325
 326         virtual void OnCleanup(int target_type, void* item)
 327         {
 328                 if (target_type == TYPE_USER)
 329                 {
 330                         User* user = (User*)item;
 331
 332                         if (user->GetIOHook() == this)
 333                         {
 334                                 // User is using SSL, they're a local user, and they're using one of *our* SSL ports.
 335                                 // Potentially there could be multiple SSL modules loaded at once on different ports.
 336                                 ServerInstance->Users->QuitUser(user, "SSL module unloading");
 337                                 user->DelIOHook();
 338                         }
 339                         if (user->GetExt("ssl_cert", dummy))
 340                         {
 341                                 ssl_cert* tofree;
 342                                 user->GetExt("ssl_cert", tofree);
 343                                 delete tofree;
 344                                 user->Shrink("ssl_cert");
 345                         }
 346                 }
 347         }
 348
 349         virtual void OnUnloadModule(Module* mod, const std::string &name)
 350         {
 351                 if (mod == this)
 352                 {
 353                         for(unsigned int i = 0; i < listenports.size(); i++)
 354                         {
 355                                 for (size_t j = 0; j < ServerInstance->Config->ports.size(); j++)
 356                                         if (listenports[i] == (ServerInstance->Config->ports[j]->GetIP()+":"+ConvToStr(ServerInstance->Config->ports[j]->GetPort())))
 357                                                 ServerInstance->Config->ports[j]->SetDescription("plaintext");
 358                         }
 359                 }
 360         }
 361
 362         virtual Version GetVersion()
 363         {
 364                 return Version("$Id$", VF_VENDOR, API_VERSION);
 365         }
 366
 367
 368         virtual const char* OnRequest(Request* request)
 369         {
 370                 ISHRequest* ISR = (ISHRequest*)request;
 371                 if (strcmp("IS_NAME", request->GetId()) == 0)
 372                 {
 373                         return "openssl";
 374                 }
 375                 else if (strcmp("IS_HOOK", request->GetId()) == 0)
 376                 {
 377                         const char* ret = "OK";
 378                         try
 379                         {
 380                                 ret = ISR->Sock->AddIOHook((Module*)this) ? "OK" : NULL;
 381                         }
 382                         catch (ModuleException &e)
 383                         {
 384                                 return NULL;
 385                         }
 386
 387                         return ret;
 388                 }
 389                 else if (strcmp("IS_UNHOOK", request->GetId()) == 0)
 390                 {
 391                         return ISR->Sock->DelIOHook() ? "OK" : NULL;
 392                 }
 393                 else if (strcmp("IS_HSDONE", request->GetId()) == 0)
 394                 {
 395                         if (ISR->Sock->GetFd() < 0)
 396                                 return "OK";
 397
 398                         issl_session* session = &sessions[ISR->Sock->GetFd()];
 399                         return (session->status == ISSL_HANDSHAKING) ? NULL : "OK";
 400                 }
 401                 else if (strcmp("IS_ATTACH", request->GetId()) == 0)
 402                 {
 403                         issl_session* session = &sessions[ISR->Sock->GetFd()];
 404                         if (session->sess)
 405                         {
 406                                 VerifyCertificate(session, (BufferedSocket*)ISR->Sock);
 407                                 return "OK";
 408                         }
 409                 }
 410                 else if (strcmp("GET_FP", request->GetId()) == 0)
 411                 {
 412                         if (ISR->Sock->GetFd() > -1)
 413                         {
 414                                 issl_session* session = &sessions[ISR->Sock->GetFd()];
 415                                 if (session->sess)
 416                                 {
 417                                         Extensible* ext = ISR->Sock;
 418                                         ssl_cert* certinfo;
 419                                         if (ext->GetExt("ssl_cert",certinfo))
 420                                                 return certinfo->GetFingerprint().c_str();
 421                                 }
 422                         }
 423                 }
 424                 return NULL;
 425         }
 426
 427
 428         virtual void OnRawSocketAccept(int fd, const std::string &ip, int localport)
 429         {
 430                 /* Are there any possibilities of an out of range fd? Hope not, but lets be paranoid */
 431                 if ((fd < 0) || (fd > ServerInstance->SE->GetMaxFds() - 1))
 432                         return;
 433
 434                 issl_session* session = &sessions[fd];
 435
 436                 session->fd = fd;
 437                 session->inbuf = new char[inbufsize];
 438                 session->inbufoffset = 0;
 439                 session->sess = SSL_new(ctx);
 440                 session->status = ISSL_NONE;
 441                 session->outbound = false;
 442
 443                 if (session->sess == NULL)
 444                         return;
 445
 446                 if (SSL_set_fd(session->sess, fd) == 0)
 447                 {
 448                         ServerInstance->Logs->Log("m_ssl_openssl",DEBUG,"BUG: Can't set fd with SSL_set_fd: %d", fd);
 449                         return;
 450                 }
 451
 452                 Handshake(session);
 453         }
 454
 455         virtual void OnRawSocketConnect(int fd)
 456         {
 457                 /* Are there any possibilities of an out of range fd? Hope not, but lets be paranoid */
 458                 if ((fd < 0) || (fd > ServerInstance->SE->GetMaxFds() -1))
 459                         return;
 460
 461                 issl_session* session = &sessions[fd];
 462
 463                 session->fd = fd;
 464                 session->inbuf = new char[inbufsize];
 465                 session->inbufoffset = 0;
 466                 session->sess = SSL_new(clictx);
 467                 session->status = ISSL_NONE;
 468                 session->outbound = true;
 469
 470                 if (session->sess == NULL)
 471                         return;
 472
 473                 if (SSL_set_fd(session->sess, fd) == 0)
 474                 {
 475                         ServerInstance->Logs->Log("m_ssl_openssl",DEBUG,"BUG: Can't set fd with SSL_set_fd: %d", fd);
 476                         return;
 477                 }
 478
 479                 Handshake(session);
 480         }
 481
 482         virtual void OnRawSocketClose(int fd)
 483         {
 484                 /* Are there any possibilities of an out of range fd? Hope not, but lets be paranoid */
 485                 if ((fd < 0) || (fd > ServerInstance->SE->GetMaxFds() - 1))
 486                         return;
 487
 488                 CloseSession(&sessions[fd]);
 489
 490                 EventHandler* user = ServerInstance->SE->GetRef(fd);
 491
 492                 if ((user) && (user->GetExt("ssl_cert", dummy)))
 493                 {
 494                         ssl_cert* tofree;
 495                         user->GetExt("ssl_cert", tofree);
 496                         delete tofree;
 497                         user->Shrink("ssl_cert");
 498                 }
 499         }
 500
 501         virtual int OnRawSocketRead(int fd, char* buffer, unsigned int count, int &readresult)
 502         {
 503                 /* Are there any possibilities of an out of range fd? Hope not, but lets be paranoid */
 504                 if ((fd < 0) || (fd > ServerInstance->SE->GetMaxFds() - 1))
 505                         return 0;
 506
 507                 issl_session* session = &sessions[fd];
 508
 509                 if (!session->sess)
 510                 {
 511                         readresult = 0;
 512                         CloseSession(session);
 513                         return 1;
 514                 }
 515
 516                 if (session->status == ISSL_HANDSHAKING)
 517                 {
 518                         if (session->rstat == ISSL_READ || session->wstat == ISSL_READ)
 519                         {
 520                                 // The handshake isn't finished and it wants to read, try to finish it.
 521                                 if (!Handshake(session))
 522                                 {
 523                                         // Couldn't resume handshake.
 524                                         errno = session->status == ISSL_NONE ? EIO : EAGAIN;
 525                                         return -1;
 526                                 }
 527                         }
 528                         else
 529                         {
 530                                 errno = EAGAIN;
 531                                 return -1;
 532                         }
 533                 }
 534
 535                 // If we resumed the handshake then session->status will be ISSL_OPEN
 536
 537                 if (session->status == ISSL_OPEN)
 538                 {
 539                         if (session->wstat == ISSL_READ)
 540                         {
 541                                 if(DoWrite(session) == 0)
 542                                         return 0;
 543                         }
 544
 545                         if (session->rstat == ISSL_READ)
 546                         {
 547                                 int ret = DoRead(session);
 548
 549                                 if (ret > 0)
 550                                 {
 551                                         if (count <= session->inbufoffset)
 552                                         {
 553                                                 memcpy(buffer, session->inbuf, count);
 554                                                 // Move the stuff left in inbuf to the beginning of it
 555                                                 memmove(session->inbuf, session->inbuf + count, (session->inbufoffset - count));
 556                                                 // Now we need to set session->inbufoffset to the amount of data still waiting to be handed to insp.
 557                                                 session->inbufoffset -= count;
 558                                                 // Insp uses readresult as the count of how much data there is in buffer, so:
 559                                                 readresult = count;
 560                                         }
 561                                         else
 562                                         {
 563                                                 // There's not as much in the inbuf as there is space in the buffer, so just copy the whole thing.
 564                                                 memcpy(buffer, session->inbuf, session->inbufoffset);
 565
 566                                                 readresult = session->inbufoffset;
 567                                                 // Zero the offset, as there's nothing there..
 568                                                 session->inbufoffset = 0;
 569                                         }
 570                                         return 1;
 571                                 }
 572                                 return ret;
 573                         }
 574                 }
 575
 576                 return -1;
 577         }
 578
 579         virtual int OnRawSocketWrite(int fd, const char* buffer, int count)
 580         {
 581                 /* Are there any possibilities of an out of range fd? Hope not, but lets be paranoid */
 582                 if ((fd < 0) || (fd > ServerInstance->SE->GetMaxFds() - 1))
 583                         return 0;
 584
 585                 errno = EAGAIN;
 586                 issl_session* session = &sessions[fd];
 587
 588                 if (!session->sess)
 589                 {
 590                         CloseSession(session);
 591                         return -1;
 592                 }
 593
 594                 session->outbuf.append(buffer, count);
 595                 MakePollWrite(session);
 596
 597                 if (session->status == ISSL_HANDSHAKING)
 598                 {
 599                         // The handshake isn't finished, try to finish it.
 600                         if (session->rstat == ISSL_WRITE || session->wstat == ISSL_WRITE)
 601                         {
 602                                 if (!Handshake(session))
 603                                 {
 604                                         // Couldn't resume handshake.
 605                                         errno = session->status == ISSL_NONE ? EIO : EAGAIN;
 606                                         return -1;
 607                                 }
 608                         }
 609                 }
 610
 611                 if (session->status == ISSL_OPEN)
 612                 {
 613                         if (session->rstat == ISSL_WRITE)
 614                         {
 615                                 DoRead(session);
 616                         }
 617
 618                         if (session->wstat == ISSL_WRITE)
 619                         {
 620                                 return DoWrite(session);
 621                         }
 622                 }
 623
 624                 return 1;
 625         }
 626
 627         int DoWrite(issl_session* session)
 628         {
 629                 if (!session->outbuf.size())
 630                         return -1;
 631
 632                 int ret = SSL_write(session->sess, session->outbuf.data(), session->outbuf.size());
 633
 634                 if (ret == 0)
 635                 {
 636                         CloseSession(session);
 637                         return 0;
 638                 }
 639                 else if (ret < 0)
 640                 {
 641                         int err = SSL_get_error(session->sess, ret);
 642
 643                         if (err == SSL_ERROR_WANT_WRITE)
 644                         {
 645                                 session->wstat = ISSL_WRITE;
 646                                 return -1;
 647                         }
 648                         else if (err == SSL_ERROR_WANT_READ)
 649                         {
 650                                 session->wstat = ISSL_READ;
 651                                 return -1;
 652                         }
 653                         else
 654                         {
 655                                 CloseSession(session);
 656                                 return 0;
 657                         }
 658                 }
 659                 else
 660                 {
 661                         session->outbuf = session->outbuf.substr(ret);
 662                         return ret;
 663                 }
 664         }
 665
 666         int DoRead(issl_session* session)
 667         {
 668                 // Is this right? Not sure if the unencrypted data is garaunteed to be the same length.
 669                 // Read into the inbuffer, offset from the beginning by the amount of data we have that insp hasn't taken yet.
 670
 671                 int ret = SSL_read(session->sess, session->inbuf + session->inbufoffset, inbufsize - session->inbufoffset);
 672
 673                 if (ret == 0)
 674                 {
 675                         // Client closed connection.
 676                         CloseSession(session);
 677                         return 0;
 678                 }
 679                 else if (ret < 0)
 680                 {
 681                         int err = SSL_get_error(session->sess, ret);
 682
 683                         if (err == SSL_ERROR_WANT_READ)
 684                         {
 685                                 session->rstat = ISSL_READ;
 686                                 return -1;
 687                         }
 688                         else if (err == SSL_ERROR_WANT_WRITE)
 689                         {
 690                                 session->rstat = ISSL_WRITE;
 691                                 MakePollWrite(session);
 692                                 return -1;
 693                         }
 694                         else
 695                         {
 696                                 CloseSession(session);
 697                                 return 0;
 698                         }
 699                 }
 700                 else
 701                 {
 702                         // Read successfully 'ret' bytes into inbuf + inbufoffset
 703                         // There are 'ret' + 'inbufoffset' bytes of data in 'inbuf'
 704                         // 'buffer' is 'count' long
 705
 706                         session->inbufoffset += ret;
 707
 708                         return ret;
 709                 }
 710         }
 711
 712         // :kenny.chatspike.net 320 Om Epy|AFK :is a Secure Connection
 713         virtual void OnWhois(User* source, User* dest)
 714         {
 715                 if (!clientactive)
 716                         return;
 717
 718                 // Bugfix, only send this numeric for *our* SSL users
 719                 if (dest->GetExt("ssl", dummy))
 720                 {
 721                         ServerInstance->SendWhoisLine(source, dest, 320, "%s %s :is using a secure connection", source->nick.c_str(), dest->nick.c_str());
 722                 }
 723         }
 724
 725         virtual void OnSyncUserMetaData(User* user, Module* proto, void* opaque, const std::string &extname, bool displayable)
 726         {
 727                 // check if the linking module wants to know about OUR metadata
 728                 if (extname == "ssl")
 729                 {
 730                         // check if this user has an swhois field to send
 731                         if(user->GetExt(extname, dummy))
 732                         {
 733                                 // call this function in the linking module, let it format the data how it
 734                                 // sees fit, and send it on its way. We dont need or want to know how.
 735                                 proto->ProtoSendMetaData(opaque, TYPE_USER, user, extname, displayable ? "Enabled" : "ON");
 736                         }
 737                 }
 738         }
 739
 740         virtual void OnDecodeMetaData(int target_type, void* target, const std::string &extname, const std::string &extdata)
 741         {
 742                 // check if its our metadata key, and its associated with a user
 743                 if ((target_type == TYPE_USER) && (extname == "ssl"))
 744                 {
 745                         User* dest = (User*)target;
 746                         // if they dont already have an ssl flag, accept the remote server's
 747                         if (!dest->GetExt(extname, dummy))
 748                         {
 749                                 dest->Extend(extname, "ON");
 750                         }
 751                 }
 752         }
 753
 754         bool Handshake(issl_session* session)
 755         {
 756                 int ret;
 757
 758                 if (session->outbound)
 759                         ret = SSL_connect(session->sess);
 760                 else
 761                         ret = SSL_accept(session->sess);
 762
 763                 if (ret < 0)
 764                 {
 765                         int err = SSL_get_error(session->sess, ret);
 766
 767                         if (err == SSL_ERROR_WANT_READ)
 768                         {
 769                                 session->rstat = ISSL_READ;
 770                                 session->status = ISSL_HANDSHAKING;
 771                                 return true;
 772                         }
 773                         else if (err == SSL_ERROR_WANT_WRITE)
 774                         {
 775                                 session->wstat = ISSL_WRITE;
 776                                 session->status = ISSL_HANDSHAKING;
 777                                 MakePollWrite(session);
 778                                 return true;
 779                         }
 780                         else
 781                         {
 782                                 CloseSession(session);
 783                         }
 784
 785                         return false;
 786                 }
 787                 else if (ret > 0)
 788                 {
 789                         // Handshake complete.
 790                         // This will do for setting the ssl flag...it could be done earlier if it's needed. But this seems neater.
 791                         EventHandler *u = ServerInstance->SE->GetRef(session->fd);
 792                         if (u)
 793                         {
 794                                 if (!u->GetExt("ssl", dummy))
 795                                         u->Extend("ssl", "ON");
 796                         }
 797
 798                         session->status = ISSL_OPEN;
 799
 800                         MakePollWrite(session);
 801
 802                         return true;
 803                 }
 804                 else if (ret == 0)
 805                 {
 806                         CloseSession(session);
 807                         return true;
 808                 }
 809
 810                 return true;
 811         }
 812
 813         virtual void OnPostConnect(User* user)
 814         {
 815                 // This occurs AFTER OnUserConnect so we can be sure the
 816                 // protocol module has propagated the NICK message.
 817                 if ((user->GetIOHook() == this) && (IS_LOCAL(user)))
 818                 {
 819                         // Tell whatever protocol module we're using that we need to inform other servers of this metadata NOW.
 820                         ServerInstance->PI->SendMetaData(user, TYPE_USER, "ssl", "on");
 821
 822                         VerifyCertificate(&sessions[user->GetFd()], user);
 823                         if (sessions[user->GetFd()].sess)
 824                                 user->WriteServ("NOTICE %s :*** You are connected using SSL cipher \"%s\"", user->nick.c_str(), SSL_get_cipher(sessions[user->GetFd()].sess));
 825                 }
 826         }
 827
 828         void MakePollWrite(issl_session* session)
 829         {
 830                 //OnRawSocketWrite(session->fd, NULL, 0);
 831                 EventHandler* eh = ServerInstance->SE->GetRef(session->fd);
 832                 if (eh)
 833                 {
 834                         ServerInstance->SE->WantWrite(eh);
 835                 }
 836         }
 837
 838         virtual void OnBufferFlushed(User* user)
 839         {
 840                 if (user->GetIOHook() == this)
 841                 {
 842                         issl_session* session = &sessions[user->GetFd()];
 843                         if (session && session->outbuf.size())
 844                                 OnRawSocketWrite(user->GetFd(), NULL, 0);
 845                 }
 846         }
 847
 848         void CloseSession(issl_session* session)
 849         {
 850                 if (session->sess)
 851                 {
 852                         SSL_shutdown(session->sess);
 853                         SSL_free(session->sess);
 854                 }
 855
 856                 if (session->inbuf)
 857                 {
 858                         delete[] session->inbuf;
 859                 }
 860
 861                 session->outbuf.clear();
 862                 session->inbuf = NULL;
 863                 session->sess = NULL;
 864                 session->status = ISSL_NONE;
 865                 errno = EIO;
 866         }
 867
 868         void VerifyCertificate(issl_session* session, Extensible* user)
 869         {
 870                 if (!session->sess || !user)
 871                         return;
 872
 873                 X509* cert;
 874                 ssl_cert* certinfo = new ssl_cert;
 875                 unsigned int n;
 876                 unsigned char md[EVP_MAX_MD_SIZE];
 877                 const EVP_MD *digest = EVP_md5();
 878
 879                 user->Extend("ssl_cert",certinfo);
 880
 881                 cert = SSL_get_peer_certificate((SSL*)session->sess);
 882
 883                 if (!cert)
 884                 {
 885                         certinfo->data.insert(std::make_pair("error","Could not get peer certificate: "+std::string(get_error())));
 886                         return;
 887                 }
 888
 889                 certinfo->data.insert(std::make_pair("invalid", SSL_get_verify_result(session->sess) != X509_V_OK ? ConvToStr(1) : ConvToStr(0)));
 890
 891                 if (SelfSigned)
 892                 {
 893                         certinfo->data.insert(std::make_pair("unknownsigner",ConvToStr(0)));
 894                         certinfo->data.insert(std::make_pair("trusted",ConvToStr(1)));
 895                 }
 896                 else
 897                 {
 898                         certinfo->data.insert(std::make_pair("unknownsigner",ConvToStr(1)));
 899                         certinfo->data.insert(std::make_pair("trusted",ConvToStr(0)));
 900                 }
 901
 902                 certinfo->data.insert(std::make_pair("dn",std::string(X509_NAME_oneline(X509_get_subject_name(cert),0,0))));
 903                 certinfo->data.insert(std::make_pair("issuer",std::string(X509_NAME_oneline(X509_get_issuer_name(cert),0,0))));
 904
 905                 if (!X509_digest(cert, digest, md, &n))
 906                 {
 907                         certinfo->data.insert(std::make_pair("error","Out of memory generating fingerprint"));
 908                 }
 909                 else
 910                 {
 911                         certinfo->data.insert(std::make_pair("fingerprint",irc::hex(md, n)));
 912                 }
 913
 914                 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))
 915                 {
 916                         certinfo->data.insert(std::make_pair("error","Not activated, or expired certificate"));
 917                 }
 918
 919                 X509_free(cert);
 920         }
 921
 922         void Prioritize()
 923         {
 924                 Module* server = ServerInstance->Modules->Find("m_spanningtree.so");
 925                 ServerInstance->Modules->SetPriority(this, I_OnPostConnect, PRIORITY_AFTER, &server);
 926         }
 927
 928 };
 929
 930 static int error_callback(const char *str, size_t len, void *u)
 931 {
 932         ModuleSSLOpenSSL* mssl = (ModuleSSLOpenSSL*)u;
 933         mssl->PublicInstance->Logs->Log("m_ssl_openssl",DEFAULT, "SSL error: " + std::string(str, len - 1));
 934
 935         //
 936         // XXX: Remove this line, it causes valgrind warnings...
 937         //
 938         // MD_update(&m, buf, j);
 939         //
 940         //
 941         // ... ONLY JOKING! :-)
 942         //
 943
 944         return 0;
 945 }
 946
 947 MODULE_INIT(ModuleSSLOpenSSL)