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                 return NULL;
 411         }
 412
 413
 414         virtual void OnRawSocketAccept(int fd, const std::string &ip, int localport)
 415         {
 416                 /* Are there any possibilities of an out of range fd? Hope not, but lets be paranoid */
 417                 if ((fd < 0) || (fd > ServerInstance->SE->GetMaxFds() - 1))
 418                         return;
 419
 420                 issl_session* session = &sessions[fd];
 421
 422                 session->fd = fd;
 423                 session->inbuf = new char[inbufsize];
 424                 session->inbufoffset = 0;
 425                 session->sess = SSL_new(ctx);
 426                 session->status = ISSL_NONE;
 427                 session->outbound = false;
 428
 429                 if (session->sess == NULL)
 430                         return;
 431
 432                 if (SSL_set_fd(session->sess, fd) == 0)
 433                 {
 434                         ServerInstance->Logs->Log("m_ssl_openssl",DEBUG,"BUG: Can't set fd with SSL_set_fd: %d", fd);
 435                         return;
 436                 }
 437
 438                 Handshake(session);
 439         }
 440
 441         virtual void OnRawSocketConnect(int fd)
 442         {
 443                 /* Are there any possibilities of an out of range fd? Hope not, but lets be paranoid */
 444                 if ((fd < 0) || (fd > ServerInstance->SE->GetMaxFds() -1))
 445                         return;
 446
 447                 issl_session* session = &sessions[fd];
 448
 449                 session->fd = fd;
 450                 session->inbuf = new char[inbufsize];
 451                 session->inbufoffset = 0;
 452                 session->sess = SSL_new(clictx);
 453                 session->status = ISSL_NONE;
 454                 session->outbound = true;
 455
 456                 if (session->sess == NULL)
 457                         return;
 458
 459                 if (SSL_set_fd(session->sess, fd) == 0)
 460                 {
 461                         ServerInstance->Logs->Log("m_ssl_openssl",DEBUG,"BUG: Can't set fd with SSL_set_fd: %d", fd);
 462                         return;
 463                 }
 464
 465                 Handshake(session);
 466         }
 467
 468         virtual void OnRawSocketClose(int fd)
 469         {
 470                 /* Are there any possibilities of an out of range fd? Hope not, but lets be paranoid */
 471                 if ((fd < 0) || (fd > ServerInstance->SE->GetMaxFds() - 1))
 472                         return;
 473
 474                 CloseSession(&sessions[fd]);
 475
 476                 EventHandler* user = ServerInstance->SE->GetRef(fd);
 477
 478                 if ((user) && (user->GetExt("ssl_cert", dummy)))
 479                 {
 480                         ssl_cert* tofree;
 481                         user->GetExt("ssl_cert", tofree);
 482                         delete tofree;
 483                         user->Shrink("ssl_cert");
 484                 }
 485         }
 486
 487         virtual int OnRawSocketRead(int fd, char* buffer, unsigned int count, int &readresult)
 488         {
 489                 /* Are there any possibilities of an out of range fd? Hope not, but lets be paranoid */
 490                 if ((fd < 0) || (fd > ServerInstance->SE->GetMaxFds() - 1))
 491                         return 0;
 492
 493                 issl_session* session = &sessions[fd];
 494
 495                 if (!session->sess)
 496                 {
 497                         readresult = 0;
 498                         CloseSession(session);
 499                         return 1;
 500                 }
 501
 502                 if (session->status == ISSL_HANDSHAKING)
 503                 {
 504                         if (session->rstat == ISSL_READ || session->wstat == ISSL_READ)
 505                         {
 506                                 // The handshake isn't finished and it wants to read, try to finish it.
 507                                 if (!Handshake(session))
 508                                 {
 509                                         // Couldn't resume handshake.
 510                                         errno = session->status == ISSL_NONE ? EIO : EAGAIN;
 511                                         return -1;
 512                                 }
 513                         }
 514                         else
 515                         {
 516                                 errno = EAGAIN;
 517                                 return -1;
 518                         }
 519                 }
 520
 521                 // If we resumed the handshake then session->status will be ISSL_OPEN
 522
 523                 if (session->status == ISSL_OPEN)
 524                 {
 525                         if (session->wstat == ISSL_READ)
 526                         {
 527                                 if(DoWrite(session) == 0)
 528                                         return 0;
 529                         }
 530
 531                         if (session->rstat == ISSL_READ)
 532                         {
 533                                 int ret = DoRead(session);
 534
 535                                 if (ret > 0)
 536                                 {
 537                                         if (count <= session->inbufoffset)
 538                                         {
 539                                                 memcpy(buffer, session->inbuf, count);
 540                                                 // Move the stuff left in inbuf to the beginning of it
 541                                                 memmove(session->inbuf, session->inbuf + count, (session->inbufoffset - count));
 542                                                 // Now we need to set session->inbufoffset to the amount of data still waiting to be handed to insp.
 543                                                 session->inbufoffset -= count;
 544                                                 // Insp uses readresult as the count of how much data there is in buffer, so:
 545                                                 readresult = count;
 546                                         }
 547                                         else
 548                                         {
 549                                                 // There's not as much in the inbuf as there is space in the buffer, so just copy the whole thing.
 550                                                 memcpy(buffer, session->inbuf, session->inbufoffset);
 551
 552                                                 readresult = session->inbufoffset;
 553                                                 // Zero the offset, as there's nothing there..
 554                                                 session->inbufoffset = 0;
 555                                         }
 556                                         return 1;
 557                                 }
 558                                 return ret;
 559                         }
 560                 }
 561
 562                 return -1;
 563         }
 564
 565         virtual int OnRawSocketWrite(int fd, const char* buffer, int count)
 566         {
 567                 /* Are there any possibilities of an out of range fd? Hope not, but lets be paranoid */
 568                 if ((fd < 0) || (fd > ServerInstance->SE->GetMaxFds() - 1))
 569                         return 0;
 570
 571                 errno = EAGAIN;
 572                 issl_session* session = &sessions[fd];
 573
 574                 if (!session->sess)
 575                 {
 576                         CloseSession(session);
 577                         return -1;
 578                 }
 579
 580                 session->outbuf.append(buffer, count);
 581                 MakePollWrite(session);
 582
 583                 if (session->status == ISSL_HANDSHAKING)
 584                 {
 585                         // The handshake isn't finished, try to finish it.
 586                         if (session->rstat == ISSL_WRITE || session->wstat == ISSL_WRITE)
 587                         {
 588                                 if (!Handshake(session))
 589                                 {
 590                                         // Couldn't resume handshake.
 591                                         errno = session->status == ISSL_NONE ? EIO : EAGAIN;
 592                                         return -1;
 593                                 }
 594                         }
 595                 }
 596
 597                 if (session->status == ISSL_OPEN)
 598                 {
 599                         if (session->rstat == ISSL_WRITE)
 600                         {
 601                                 DoRead(session);
 602                         }
 603
 604                         if (session->wstat == ISSL_WRITE)
 605                         {
 606                                 return DoWrite(session);
 607                         }
 608                 }
 609
 610                 return 1;
 611         }
 612
 613         int DoWrite(issl_session* session)
 614         {
 615                 if (!session->outbuf.size())
 616                         return -1;
 617
 618                 int ret = SSL_write(session->sess, session->outbuf.data(), session->outbuf.size());
 619
 620                 if (ret == 0)
 621                 {
 622                         CloseSession(session);
 623                         return 0;
 624                 }
 625                 else if (ret < 0)
 626                 {
 627                         int err = SSL_get_error(session->sess, ret);
 628
 629                         if (err == SSL_ERROR_WANT_WRITE)
 630                         {
 631                                 session->wstat = ISSL_WRITE;
 632                                 return -1;
 633                         }
 634                         else if (err == SSL_ERROR_WANT_READ)
 635                         {
 636                                 session->wstat = ISSL_READ;
 637                                 return -1;
 638                         }
 639                         else
 640                         {
 641                                 CloseSession(session);
 642                                 return 0;
 643                         }
 644                 }
 645                 else
 646                 {
 647                         session->outbuf = session->outbuf.substr(ret);
 648                         return ret;
 649                 }
 650         }
 651
 652         int DoRead(issl_session* session)
 653         {
 654                 // Is this right? Not sure if the unencrypted data is garaunteed to be the same length.
 655                 // Read into the inbuffer, offset from the beginning by the amount of data we have that insp hasn't taken yet.
 656
 657                 int ret = SSL_read(session->sess, session->inbuf + session->inbufoffset, inbufsize - session->inbufoffset);
 658
 659                 if (ret == 0)
 660                 {
 661                         // Client closed connection.
 662                         CloseSession(session);
 663                         return 0;
 664                 }
 665                 else 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                                 return -1;
 673                         }
 674                         else if (err == SSL_ERROR_WANT_WRITE)
 675                         {
 676                                 session->rstat = ISSL_WRITE;
 677                                 MakePollWrite(session);
 678                                 return -1;
 679                         }
 680                         else
 681                         {
 682                                 CloseSession(session);
 683                                 return 0;
 684                         }
 685                 }
 686                 else
 687                 {
 688                         // Read successfully 'ret' bytes into inbuf + inbufoffset
 689                         // There are 'ret' + 'inbufoffset' bytes of data in 'inbuf'
 690                         // 'buffer' is 'count' long
 691
 692                         session->inbufoffset += ret;
 693
 694                         return ret;
 695                 }
 696         }
 697
 698         // :kenny.chatspike.net 320 Om Epy|AFK :is a Secure Connection
 699         virtual void OnWhois(User* source, User* dest)
 700         {
 701                 if (!clientactive)
 702                         return;
 703
 704                 // Bugfix, only send this numeric for *our* SSL users
 705                 if (dest->GetExt("ssl", dummy))
 706                 {
 707                         ServerInstance->SendWhoisLine(source, dest, 320, "%s %s :is using a secure connection", source->nick.c_str(), dest->nick.c_str());
 708                 }
 709         }
 710
 711         virtual void OnSyncUserMetaData(User* user, Module* proto, void* opaque, const std::string &extname, bool displayable)
 712         {
 713                 // check if the linking module wants to know about OUR metadata
 714                 if (extname == "ssl")
 715                 {
 716                         // check if this user has an swhois field to send
 717                         if(user->GetExt(extname, dummy))
 718                         {
 719                                 // call this function in the linking module, let it format the data how it
 720                                 // sees fit, and send it on its way. We dont need or want to know how.
 721                                 proto->ProtoSendMetaData(opaque, TYPE_USER, user, extname, displayable ? "Enabled" : "ON");
 722                         }
 723                 }
 724         }
 725
 726         virtual void OnDecodeMetaData(int target_type, void* target, const std::string &extname, const std::string &extdata)
 727         {
 728                 // check if its our metadata key, and its associated with a user
 729                 if ((target_type == TYPE_USER) && (extname == "ssl"))
 730                 {
 731                         User* dest = (User*)target;
 732                         // if they dont already have an ssl flag, accept the remote server's
 733                         if (!dest->GetExt(extname, dummy))
 734                         {
 735                                 dest->Extend(extname, "ON");
 736                         }
 737                 }
 738         }
 739
 740         bool Handshake(issl_session* session)
 741         {
 742                 int ret;
 743
 744                 if (session->outbound)
 745                         ret = SSL_connect(session->sess);
 746                 else
 747                         ret = SSL_accept(session->sess);
 748
 749                 if (ret < 0)
 750                 {
 751                         int err = SSL_get_error(session->sess, ret);
 752
 753                         if (err == SSL_ERROR_WANT_READ)
 754                         {
 755                                 session->rstat = ISSL_READ;
 756                                 session->status = ISSL_HANDSHAKING;
 757                                 return true;
 758                         }
 759                         else if (err == SSL_ERROR_WANT_WRITE)
 760                         {
 761                                 session->wstat = ISSL_WRITE;
 762                                 session->status = ISSL_HANDSHAKING;
 763                                 MakePollWrite(session);
 764                                 return true;
 765                         }
 766                         else
 767                         {
 768                                 CloseSession(session);
 769                         }
 770
 771                         return false;
 772                 }
 773                 else if (ret > 0)
 774                 {
 775                         // Handshake complete.
 776                         // This will do for setting the ssl flag...it could be done earlier if it's needed. But this seems neater.
 777                         EventHandler *u = ServerInstance->SE->GetRef(session->fd);
 778                         if (u)
 779                         {
 780                                 if (!u->GetExt("ssl", dummy))
 781                                         u->Extend("ssl", "ON");
 782                         }
 783
 784                         session->status = ISSL_OPEN;
 785
 786                         MakePollWrite(session);
 787
 788                         return true;
 789                 }
 790                 else if (ret == 0)
 791                 {
 792                         CloseSession(session);
 793                         return true;
 794                 }
 795
 796                 return true;
 797         }
 798
 799         virtual void OnPostConnect(User* user)
 800         {
 801                 // This occurs AFTER OnUserConnect so we can be sure the
 802                 // protocol module has propagated the NICK message.
 803                 if ((user->GetIOHook() == this) && (IS_LOCAL(user)))
 804                 {
 805                         // Tell whatever protocol module we're using that we need to inform other servers of this metadata NOW.
 806                         ServerInstance->PI->SendMetaData(user, TYPE_USER, "ssl", "on");
 807
 808                         VerifyCertificate(&sessions[user->GetFd()], user);
 809                         if (sessions[user->GetFd()].sess)
 810                                 user->WriteServ("NOTICE %s :*** You are connected using SSL cipher \"%s\"", user->nick.c_str(), SSL_get_cipher(sessions[user->GetFd()].sess));
 811                 }
 812         }
 813
 814         void MakePollWrite(issl_session* session)
 815         {
 816                 //OnRawSocketWrite(session->fd, NULL, 0);
 817                 EventHandler* eh = ServerInstance->SE->GetRef(session->fd);
 818                 if (eh)
 819                 {
 820                         ServerInstance->SE->WantWrite(eh);
 821                 }
 822         }
 823
 824         virtual void OnBufferFlushed(User* user)
 825         {
 826                 if (user->GetIOHook() == this)
 827                 {
 828                         issl_session* session = &sessions[user->GetFd()];
 829                         if (session && session->outbuf.size())
 830                                 OnRawSocketWrite(user->GetFd(), NULL, 0);
 831                 }
 832         }
 833
 834         void CloseSession(issl_session* session)
 835         {
 836                 if (session->sess)
 837                 {
 838                         SSL_shutdown(session->sess);
 839                         SSL_free(session->sess);
 840                 }
 841
 842                 if (session->inbuf)
 843                 {
 844                         delete[] session->inbuf;
 845                 }
 846
 847                 session->outbuf.clear();
 848                 session->inbuf = NULL;
 849                 session->sess = NULL;
 850                 session->status = ISSL_NONE;
 851                 errno = EIO;
 852         }
 853
 854         void VerifyCertificate(issl_session* session, Extensible* user)
 855         {
 856                 if (!session->sess || !user)
 857                         return;
 858
 859                 X509* cert;
 860                 ssl_cert* certinfo = new ssl_cert;
 861                 unsigned int n;
 862                 unsigned char md[EVP_MAX_MD_SIZE];
 863                 const EVP_MD *digest = EVP_md5();
 864
 865                 user->Extend("ssl_cert",certinfo);
 866
 867                 cert = SSL_get_peer_certificate((SSL*)session->sess);
 868
 869                 if (!cert)
 870                 {
 871                         certinfo->data.insert(std::make_pair("error","Could not get peer certificate: "+std::string(get_error())));
 872                         return;
 873                 }
 874
 875                 certinfo->data.insert(std::make_pair("invalid", SSL_get_verify_result(session->sess) != X509_V_OK ? ConvToStr(1) : ConvToStr(0)));
 876
 877                 if (SelfSigned)
 878                 {
 879                         certinfo->data.insert(std::make_pair("unknownsigner",ConvToStr(0)));
 880                         certinfo->data.insert(std::make_pair("trusted",ConvToStr(1)));
 881                 }
 882                 else
 883                 {
 884                         certinfo->data.insert(std::make_pair("unknownsigner",ConvToStr(1)));
 885                         certinfo->data.insert(std::make_pair("trusted",ConvToStr(0)));
 886                 }
 887
 888                 certinfo->data.insert(std::make_pair("dn",std::string(X509_NAME_oneline(X509_get_subject_name(cert),0,0))));
 889                 certinfo->data.insert(std::make_pair("issuer",std::string(X509_NAME_oneline(X509_get_issuer_name(cert),0,0))));
 890
 891                 if (!X509_digest(cert, digest, md, &n))
 892                 {
 893                         certinfo->data.insert(std::make_pair("error","Out of memory generating fingerprint"));
 894                 }
 895                 else
 896                 {
 897                         certinfo->data.insert(std::make_pair("fingerprint",irc::hex(md, n)));
 898                 }
 899
 900                 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))
 901                 {
 902                         certinfo->data.insert(std::make_pair("error","Not activated, or expired certificate"));
 903                 }
 904
 905                 X509_free(cert);
 906         }
 907
 908         void Prioritize()
 909         {
 910                 Module* server = ServerInstance->Modules->Find("m_spanningtree.so");
 911                 ServerInstance->Modules->SetPriority(this, I_OnPostConnect, PRIORITY_AFTER, &server);
 912         }
 913
 914 };
 915
 916 static int error_callback(const char *str, size_t len, void *u)
 917 {
 918         ModuleSSLOpenSSL* mssl = (ModuleSSLOpenSSL*)u;
 919         mssl->PublicInstance->Logs->Log("m_ssl_openssl",DEFAULT, "SSL error: " + std::string(str, len - 1));
 920
 921         //
 922         // XXX: Remove this line, it causes valgrind warnings...
 923         //
 924         // MD_update(&m, buf, j);
 925         //
 926         //
 927         // ... ONLY JOKING! :-)
 928         //
 929
 930         return 0;
 931 }
 932
 933 MODULE_INIT(ModuleSSLOpenSSL)