src/modules/extra/m_ssl_openssl.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2008 InspIRCd Development Team
   6  * See: http://www.inspircd.org/wiki/index.php/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
  16 #include <openssl/ssl.h>
  17 #include <openssl/err.h>
  18
  19 #include "configreader.h"
  20 #include "users.h"
  21 #include "channels.h"
  22 #include "modules.h"
  23
  24 #include "socket.h"
  25 #include "hashcomp.h"
  26
  27 #include "transport.h"
  28
  29 #ifdef WINDOWS
  30 #pragma comment(lib, "libeay32MTd")
  31 #pragma comment(lib, "ssleay32MTd")
  32 #undef MAX_DESCRIPTORS
  33 #define MAX_DESCRIPTORS 10000
  34 #endif
  35
  36 /* $ModDesc: Provides SSL support for clients */
  37 /* $CompileFlags: pkgconfversion("openssl","0.9.7") pkgconfincludes("openssl","/openssl/ssl.h","") */
  38 /* $LinkerFlags: rpath("pkg-config --libs openssl") pkgconflibs("openssl","/libssl.so","-lssl -lcrypto -ldl") */
  39 /* $ModDep: transport.h */
  40 /* $NoPedantic */
  41 /* $CopyInstall: conf/key.pem $(CONPATH) */
  42 /* $CopyInstall: conf/cert.pem $(CONPATH) */
  43
  44 enum issl_status { ISSL_NONE, ISSL_HANDSHAKING, ISSL_OPEN };
  45 enum issl_io_status { ISSL_WRITE, ISSL_READ };
  46
  47 static bool SelfSigned = false;
  48
  49 bool isin(const std::string &hostandport, const std::vector<std::string> &portlist)
  50 {
  51         return std::find(portlist.begin(), portlist.end(), hostandport) != 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[MAX_DESCRIPTORS];
 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                 // Not rehashable...because I cba to reduce all the sizes of existing buffers.
 131                 inbufsize = ServerInstance->Config->NetBufferSize;
 132
 133                 /* Global SSL library initialization*/
 134                 SSL_library_init();
 135                 SSL_load_error_strings();
 136
 137                 /* Build our SSL contexts:
 138                  * NOTE: OpenSSL makes us have two contexts, one for servers and one for clients. ICK.
 139                  */
 140                 ctx = SSL_CTX_new( SSLv23_server_method() );
 141                 clictx = SSL_CTX_new( SSLv23_client_method() );
 142
 143                 SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER | SSL_VERIFY_CLIENT_ONCE, OnVerify);
 144                 SSL_CTX_set_verify(clictx, SSL_VERIFY_PEER | SSL_VERIFY_CLIENT_ONCE, OnVerify);
 145
 146                 // Needs the flag as it ignores a plain /rehash
 147                 OnRehash(NULL,"ssl");
 148                 Implementation eventlist[] = { I_OnRawSocketConnect, I_OnRawSocketAccept, I_OnRawSocketClose, I_OnRawSocketRead, I_OnRawSocketWrite, I_OnCleanup, I_On005Numeric,
 149                         I_OnBufferFlushed, I_OnRequest, I_OnSyncUserMetaData, I_OnDecodeMetaData, I_OnUnloadModule, I_OnRehash, I_OnWhois, I_OnPostConnect, I_OnHookUserIO };
 150                 ServerInstance->Modules->Attach(eventlist, this, 16);
 151         }
 152
 153         virtual void OnHookUserIO(User* user, const std::string &targetip)
 154         {
 155                 if (!user->io && isin(targetip + ":" + ConvToStr(user->GetPort()), listenports))
 156                 {
 157                         /* Hook the user with our module */
 158                         user->io = this;
 159                 }
 160         }
 161
 162         virtual void OnRehash(User* user, const std::string &param)
 163         {
 164                 ConfigReader Conf(ServerInstance);
 165
 166                 listenports.clear();
 167                 clientactive = 0;
 168                 sslports.clear();
 169
 170                 for(int index = 0; index < Conf.Enumerate("bind"); index++)
 171                 {
 172                         // For each <bind> tag
 173                         std::string x = Conf.ReadValue("bind", "type", index);
 174                         if(((x.empty()) || (x == "clients")) && (Conf.ReadValue("bind", "ssl", index) == "openssl"))
 175                         {
 176                                 // Get the port we're meant to be listening on with SSL
 177                                 std::string port = Conf.ReadValue("bind", "port", index);
 178                                 std::string addr = Conf.ReadValue("bind", "address", index);
 179
 180                                 irc::portparser portrange(port, false);
 181                                 long portno = -1;
 182                                 while ((portno = portrange.GetToken()))
 183                                 {
 184                                         clientactive++;
 185                                         try
 186                                         {
 187                                                 listenports.push_back(addr + ":" + ConvToStr(portno));
 188
 189                                                 for (size_t i = 0; i < ServerInstance->Config->ports.size(); i++)
 190                                                         if ((ServerInstance->Config->ports[i]->GetPort() == portno) && (ServerInstance->Config->ports[i]->GetIP() == addr))
 191                                                                 ServerInstance->Config->ports[i]->SetDescription("ssl");
 192                                                 ServerInstance->Logs->Log("m_ssl_openssl",DEFAULT, "m_ssl_gnutls.so: Enabling SSL for port %d", portno);
 193
 194                                                 sslports.append((addr.empty() ? "*" : addr)).append(":").append(ConvToStr(portno)).append(";");
 195                                         }
 196                                         catch (ModuleException &e)
 197                                         {
 198                                                 ServerInstance->Logs->Log("m_ssl_openssl",DEFAULT, "m_ssl_gnutls.so: FAILED to enable SSL on port %d: %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());
 199                                         }
 200                                 }
 201                         }
 202                 }
 203
 204                 if (!sslports.empty())
 205                         sslports.erase(sslports.end() - 1);
 206
 207                 if (param != "ssl")
 208                 {
 209                         return;
 210                 }
 211
 212                 std::string confdir(ServerInstance->ConfigFileName);
 213                 // +1 so we the path ends with a /
 214                 confdir = confdir.substr(0, confdir.find_last_of('/') + 1);
 215
 216                 cafile   = Conf.ReadValue("openssl", "cafile", 0);
 217                 certfile = Conf.ReadValue("openssl", "certfile", 0);
 218                 keyfile  = Conf.ReadValue("openssl", "keyfile", 0);
 219                 dhfile   = Conf.ReadValue("openssl", "dhfile", 0);
 220
 221                 // Set all the default values needed.
 222                 if (cafile.empty())
 223                         cafile = "ca.pem";
 224
 225                 if (certfile.empty())
 226                         certfile = "cert.pem";
 227
 228                 if (keyfile.empty())
 229                         keyfile = "key.pem";
 230
 231                 if (dhfile.empty())
 232                         dhfile = "dhparams.pem";
 233
 234                 // Prepend relative paths with the path to the config directory.
 235                 if (cafile[0] != '/')
 236                         cafile = confdir + cafile;
 237
 238                 if (certfile[0] != '/')
 239                         certfile = confdir + certfile;
 240
 241                 if (keyfile[0] != '/')
 242                         keyfile = confdir + keyfile;
 243
 244                 if (dhfile[0] != '/')
 245                         dhfile = confdir + dhfile;
 246
 247                 /* Load our keys and certificates
 248                  * NOTE: OpenSSL's error logging API sucks, don't blame us for this clusterfuck.
 249                  */
 250                 if ((!SSL_CTX_use_certificate_chain_file(ctx, certfile.c_str())) || (!SSL_CTX_use_certificate_chain_file(clictx, certfile.c_str())))
 251                 {
 252                         ServerInstance->Logs->Log("m_ssl_openssl",DEFAULT, "m_ssl_openssl.so: Can't read certificate file %s. %s", certfile.c_str(), strerror(errno));
 253                         ERR_print_errors_cb(error_callback, this);
 254                 }
 255
 256                 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)))
 257                 {
 258                         ServerInstance->Logs->Log("m_ssl_openssl",DEFAULT, "m_ssl_openssl.so: Can't read key file %s. %s", keyfile.c_str(), strerror(errno));
 259                         ERR_print_errors_cb(error_callback, this);
 260                 }
 261
 262                 /* Load the CAs we trust*/
 263                 if (((!SSL_CTX_load_verify_locations(ctx, cafile.c_str(), 0))) || (!SSL_CTX_load_verify_locations(clictx, cafile.c_str(), 0)))
 264                 {
 265                         ServerInstance->Logs->Log("m_ssl_openssl",DEFAULT, "m_ssl_openssl.so: Can't read CA list from %s. %s", cafile.c_str(), strerror(errno));
 266                         ERR_print_errors_cb(error_callback, this);
 267                 }
 268
 269                 FILE* dhpfile = fopen(dhfile.c_str(), "r");
 270                 DH* ret;
 271
 272                 if (dhpfile == NULL)
 273                 {
 274                         ServerInstance->Logs->Log("m_ssl_openssl",DEFAULT, "m_ssl_openssl.so Couldn't open DH file %s: %s", dhfile.c_str(), strerror(errno));
 275                         throw ModuleException("Couldn't open DH file " + dhfile + ": " + strerror(errno));
 276                 }
 277                 else
 278                 {
 279                         ret = PEM_read_DHparams(dhpfile, NULL, NULL, NULL);
 280                         if ((SSL_CTX_set_tmp_dh(ctx, ret) < 0) || (SSL_CTX_set_tmp_dh(clictx, ret) < 0))
 281                         {
 282                                 ServerInstance->Logs->Log("m_ssl_openssl",DEFAULT, "m_ssl_openssl.so: Couldn't set DH parameters %s. SSL errors follow:", dhfile.c_str());
 283                                 ERR_print_errors_cb(error_callback, this);
 284                         }
 285                 }
 286
 287                 fclose(dhpfile);
 288         }
 289
 290         virtual void On005Numeric(std::string &output)
 291         {
 292                 output.append(" SSL=" + sslports);
 293         }
 294
 295         virtual ~ModuleSSLOpenSSL()
 296         {
 297                 SSL_CTX_free(ctx);
 298                 SSL_CTX_free(clictx);
 299         }
 300
 301         virtual void OnCleanup(int target_type, void* item)
 302         {
 303                 if (target_type == TYPE_USER)
 304                 {
 305                         User* user = (User*)item;
 306
 307                         if (user->GetExt("ssl", dummy) && IS_LOCAL(user) && user->io == this)
 308                         {
 309                                 // User is using SSL, they're a local user, and they're using one of *our* SSL ports.
 310                                 // Potentially there could be multiple SSL modules loaded at once on different ports.
 311                                 User::QuitUser(ServerInstance, user, "SSL module unloading");
 312                         }
 313                         if (user->GetExt("ssl_cert", dummy))
 314                         {
 315                                 ssl_cert* tofree;
 316                                 user->GetExt("ssl_cert", tofree);
 317                                 delete tofree;
 318                                 user->Shrink("ssl_cert");
 319                         }
 320
 321                         user->io = NULL;
 322                 }
 323         }
 324
 325         virtual void OnUnloadModule(Module* mod, const std::string &name)
 326         {
 327                 if (mod == this)
 328                 {
 329                         for(unsigned int i = 0; i < listenports.size(); i++)
 330                         {
 331                                 for (size_t j = 0; j < ServerInstance->Config->ports.size(); j++)
 332                                         if (listenports[i] == (ServerInstance->Config->ports[j]->GetIP()+":"+ConvToStr(ServerInstance->Config->ports[j]->GetPort())))
 333                                                 ServerInstance->Config->ports[j]->SetDescription("plaintext");
 334                         }
 335                 }
 336         }
 337
 338         virtual Version GetVersion()
 339         {
 340                 return Version(1, 2, 0, 0, VF_VENDOR, API_VERSION);
 341         }
 342
 343
 344         virtual const char* OnRequest(Request* request)
 345         {
 346                 ISHRequest* ISR = (ISHRequest*)request;
 347                 if (strcmp("IS_NAME", request->GetId()) == 0)
 348                 {
 349                         return "openssl";
 350                 }
 351                 else if (strcmp("IS_HOOK", request->GetId()) == 0)
 352                 {
 353                         const char* ret = "OK";
 354                         try
 355                         {
 356                                 ret = ServerInstance->Config->AddIOHook((Module*)this, (BufferedSocket*)ISR->Sock) ? "OK" : NULL;
 357                         }
 358                         catch (ModuleException &e)
 359                         {
 360                                 return NULL;
 361                         }
 362
 363                         return ret;
 364                 }
 365                 else if (strcmp("IS_UNHOOK", request->GetId()) == 0)
 366                 {
 367                         return ServerInstance->Config->DelIOHook((BufferedSocket*)ISR->Sock) ? "OK" : NULL;
 368                 }
 369                 else if (strcmp("IS_HSDONE", request->GetId()) == 0)
 370                 {
 371                         if (ISR->Sock->GetFd() < 0)
 372                                 return "OK";
 373
 374                         issl_session* session = &sessions[ISR->Sock->GetFd()];
 375                         return (session->status == ISSL_HANDSHAKING) ? NULL : "OK";
 376                 }
 377                 else if (strcmp("IS_ATTACH", request->GetId()) == 0)
 378                 {
 379                         issl_session* session = &sessions[ISR->Sock->GetFd()];
 380                         if (session->sess)
 381                         {
 382                                 VerifyCertificate(session, (BufferedSocket*)ISR->Sock);
 383                                 return "OK";
 384                         }
 385                 }
 386                 return NULL;
 387         }
 388
 389
 390         virtual void OnRawSocketAccept(int fd, const std::string &ip, int localport)
 391         {
 392                 /* Are there any possibilities of an out of range fd? Hope not, but lets be paranoid */
 393                 if ((fd < 0) || (fd > MAX_DESCRIPTORS))
 394                         return;
 395
 396                 issl_session* session = &sessions[fd];
 397
 398                 session->fd = fd;
 399                 session->inbuf = new char[inbufsize];
 400                 session->inbufoffset = 0;
 401                 session->sess = SSL_new(ctx);
 402                 session->status = ISSL_NONE;
 403                 session->outbound = false;
 404
 405                 if (session->sess == NULL)
 406                         return;
 407
 408                 if (SSL_set_fd(session->sess, fd) == 0)
 409                 {
 410                         ServerInstance->Logs->Log("m_ssl_openssl",DEBUG,"BUG: Can't set fd with SSL_set_fd: %d", fd);
 411                         return;
 412                 }
 413
 414                 Handshake(session);
 415         }
 416
 417         virtual void OnRawSocketConnect(int fd)
 418         {
 419                 /* Are there any possibilities of an out of range fd? Hope not, but lets be paranoid */
 420                 if ((fd < 0) || (fd > MAX_DESCRIPTORS))
 421                         return;
 422
 423                 issl_session* session = &sessions[fd];
 424
 425                 session->fd = fd;
 426                 session->inbuf = new char[inbufsize];
 427                 session->inbufoffset = 0;
 428                 session->sess = SSL_new(clictx);
 429                 session->status = ISSL_NONE;
 430                 session->outbound = true;
 431
 432                 if (session->sess == NULL)
 433                         return;
 434
 435                 if (SSL_set_fd(session->sess, fd) == 0)
 436                 {
 437                         ServerInstance->Logs->Log("m_ssl_openssl",DEBUG,"BUG: Can't set fd with SSL_set_fd: %d", fd);
 438                         return;
 439                 }
 440
 441                 Handshake(session);
 442         }
 443
 444         virtual void OnRawSocketClose(int fd)
 445         {
 446                 /* Are there any possibilities of an out of range fd? Hope not, but lets be paranoid */
 447                 if ((fd < 0) || (fd > MAX_DESCRIPTORS))
 448                         return;
 449
 450                 CloseSession(&sessions[fd]);
 451
 452                 EventHandler* user = ServerInstance->SE->GetRef(fd);
 453
 454                 if ((user) && (user->GetExt("ssl_cert", dummy)))
 455                 {
 456                         ssl_cert* tofree;
 457                         user->GetExt("ssl_cert", tofree);
 458                         delete tofree;
 459                         user->Shrink("ssl_cert");
 460                 }
 461         }
 462
 463         virtual int OnRawSocketRead(int fd, char* buffer, unsigned int count, int &readresult)
 464         {
 465                 /* Are there any possibilities of an out of range fd? Hope not, but lets be paranoid */
 466                 if ((fd < 0) || (fd > MAX_DESCRIPTORS))
 467                         return 0;
 468
 469                 issl_session* session = &sessions[fd];
 470
 471                 if (!session->sess)
 472                 {
 473                         readresult = 0;
 474                         CloseSession(session);
 475                         return 1;
 476                 }
 477
 478                 if (session->status == ISSL_HANDSHAKING)
 479                 {
 480                         if (session->rstat == ISSL_READ || session->wstat == ISSL_READ)
 481                         {
 482                                 // The handshake isn't finished and it wants to read, try to finish it.
 483                                 if (!Handshake(session))
 484                                 {
 485                                         // Couldn't resume handshake.
 486                                         return -1;
 487                                 }
 488                         }
 489                         else
 490                         {
 491                                 errno = EAGAIN;
 492                                 return -1;
 493                         }
 494                 }
 495
 496                 // If we resumed the handshake then session->status will be ISSL_OPEN
 497
 498                 if (session->status == ISSL_OPEN)
 499                 {
 500                         if (session->wstat == ISSL_READ)
 501                         {
 502                                 if(DoWrite(session) == 0)
 503                                         return 0;
 504                         }
 505
 506                         if (session->rstat == ISSL_READ)
 507                         {
 508                                 int ret = DoRead(session);
 509
 510                                 if (ret > 0)
 511                                 {
 512                                         if (count <= session->inbufoffset)
 513                                         {
 514                                                 memcpy(buffer, session->inbuf, count);
 515                                                 // Move the stuff left in inbuf to the beginning of it
 516                                                 memcpy(session->inbuf, session->inbuf + count, (session->inbufoffset - count));
 517                                                 // Now we need to set session->inbufoffset to the amount of data still waiting to be handed to insp.
 518                                                 session->inbufoffset -= count;
 519                                                 // Insp uses readresult as the count of how much data there is in buffer, so:
 520                                                 readresult = count;
 521                                         }
 522                                         else
 523                                         {
 524                                                 // There's not as much in the inbuf as there is space in the buffer, so just copy the whole thing.
 525                                                 memcpy(buffer, session->inbuf, session->inbufoffset);
 526
 527                                                 readresult = session->inbufoffset;
 528                                                 // Zero the offset, as there's nothing there..
 529                                                 session->inbufoffset = 0;
 530                                         }
 531                                         return 1;
 532                                 }
 533                                 return ret;
 534                         }
 535                 }
 536
 537                 return -1;
 538         }
 539
 540         virtual int OnRawSocketWrite(int fd, const char* buffer, int count)
 541         {
 542                 /* Are there any possibilities of an out of range fd? Hope not, but lets be paranoid */
 543                 if ((fd < 0) || (fd > MAX_DESCRIPTORS))
 544                         return 0;
 545
 546                 issl_session* session = &sessions[fd];
 547
 548                 if (!session->sess)
 549                 {
 550                         CloseSession(session);
 551                         return -1;
 552                 }
 553
 554                 session->outbuf.append(buffer, count);
 555                 MakePollWrite(session);
 556
 557                 if (session->status == ISSL_HANDSHAKING)
 558                 {
 559                         // The handshake isn't finished, try to finish it.
 560                         if (session->rstat == ISSL_WRITE || session->wstat == ISSL_WRITE)
 561                         {
 562                                 Handshake(session);
 563                         }
 564                 }
 565
 566                 if (session->status == ISSL_OPEN)
 567                 {
 568                         if (session->rstat == ISSL_WRITE)
 569                         {
 570                                 DoRead(session);
 571                         }
 572
 573                         if (session->wstat == ISSL_WRITE)
 574                         {
 575                                 return DoWrite(session);
 576                         }
 577                 }
 578
 579                 return 1;
 580         }
 581
 582         int DoWrite(issl_session* session)
 583         {
 584                 if (!session->outbuf.size())
 585                         return -1;
 586
 587                 int ret = SSL_write(session->sess, session->outbuf.data(), session->outbuf.size());
 588
 589                 if (ret == 0)
 590                 {
 591                         CloseSession(session);
 592                         return 0;
 593                 }
 594                 else if (ret < 0)
 595                 {
 596                         int err = SSL_get_error(session->sess, ret);
 597
 598                         if (err == SSL_ERROR_WANT_WRITE)
 599                         {
 600                                 session->wstat = ISSL_WRITE;
 601                                 return -1;
 602                         }
 603                         else if (err == SSL_ERROR_WANT_READ)
 604                         {
 605                                 session->wstat = ISSL_READ;
 606                                 return -1;
 607                         }
 608                         else
 609                         {
 610                                 CloseSession(session);
 611                                 return 0;
 612                         }
 613                 }
 614                 else
 615                 {
 616                         session->outbuf = session->outbuf.substr(ret);
 617                         return ret;
 618                 }
 619         }
 620
 621         int DoRead(issl_session* session)
 622         {
 623                 // Is this right? Not sure if the unencrypted data is garaunteed to be the same length.
 624                 // Read into the inbuffer, offset from the beginning by the amount of data we have that insp hasn't taken yet.
 625
 626                 int ret = SSL_read(session->sess, session->inbuf + session->inbufoffset, inbufsize - session->inbufoffset);
 627
 628                 if (ret == 0)
 629                 {
 630                         // Client closed connection.
 631                         CloseSession(session);
 632                         return 0;
 633                 }
 634                 else if (ret < 0)
 635                 {
 636                         int err = SSL_get_error(session->sess, ret);
 637
 638                         if (err == SSL_ERROR_WANT_READ)
 639                         {
 640                                 session->rstat = ISSL_READ;
 641                                 return -1;
 642                         }
 643                         else if (err == SSL_ERROR_WANT_WRITE)
 644                         {
 645                                 session->rstat = ISSL_WRITE;
 646                                 MakePollWrite(session);
 647                                 return -1;
 648                         }
 649                         else
 650                         {
 651                                 CloseSession(session);
 652                                 return 0;
 653                         }
 654                 }
 655                 else
 656                 {
 657                         // Read successfully 'ret' bytes into inbuf + inbufoffset
 658                         // There are 'ret' + 'inbufoffset' bytes of data in 'inbuf'
 659                         // 'buffer' is 'count' long
 660
 661                         session->inbufoffset += ret;
 662
 663                         return ret;
 664                 }
 665         }
 666
 667         // :kenny.chatspike.net 320 Om Epy|AFK :is a Secure Connection
 668         virtual void OnWhois(User* source, User* dest)
 669         {
 670                 if (!clientactive)
 671                         return;
 672
 673                 // Bugfix, only send this numeric for *our* SSL users
 674                 if (dest->GetExt("ssl", dummy) || ((IS_LOCAL(dest) && dest->io == this)))
 675                 {
 676                         ServerInstance->SendWhoisLine(source, dest, 320, "%s %s :is using a secure connection", source->nick, dest->nick);
 677                 }
 678         }
 679
 680         virtual void OnSyncUserMetaData(User* user, Module* proto, void* opaque, const std::string &extname, bool displayable)
 681         {
 682                 // check if the linking module wants to know about OUR metadata
 683                 if (extname == "ssl")
 684                 {
 685                         // check if this user has an swhois field to send
 686                         if(user->GetExt(extname, dummy))
 687                         {
 688                                 // call this function in the linking module, let it format the data how it
 689                                 // sees fit, and send it on its way. We dont need or want to know how.
 690                                 proto->ProtoSendMetaData(opaque, TYPE_USER, user, extname, displayable ? "Enabled" : "ON");
 691                         }
 692                 }
 693         }
 694
 695         virtual void OnDecodeMetaData(int target_type, void* target, const std::string &extname, const std::string &extdata)
 696         {
 697                 // check if its our metadata key, and its associated with a user
 698                 if ((target_type == TYPE_USER) && (extname == "ssl"))
 699                 {
 700                         User* dest = (User*)target;
 701                         // if they dont already have an ssl flag, accept the remote server's
 702                         if (!dest->GetExt(extname, dummy))
 703                         {
 704                                 dest->Extend(extname, "ON");
 705                         }
 706                 }
 707         }
 708
 709         bool Handshake(issl_session* session)
 710         {
 711                 int ret;
 712
 713                 if (session->outbound)
 714                         ret = SSL_connect(session->sess);
 715                 else
 716                         ret = SSL_accept(session->sess);
 717
 718                 if (ret < 0)
 719                 {
 720                         int err = SSL_get_error(session->sess, ret);
 721
 722                         if (err == SSL_ERROR_WANT_READ)
 723                         {
 724                                 session->rstat = ISSL_READ;
 725                                 session->status = ISSL_HANDSHAKING;
 726                                 return true;
 727                         }
 728                         else if (err == SSL_ERROR_WANT_WRITE)
 729                         {
 730                                 session->wstat = ISSL_WRITE;
 731                                 session->status = ISSL_HANDSHAKING;
 732                                 MakePollWrite(session);
 733                                 return true;
 734                         }
 735                         else
 736                         {
 737                                 CloseSession(session);
 738                         }
 739
 740                         return false;
 741                 }
 742                 else if (ret > 0)
 743                 {
 744                         // Handshake complete.
 745                         // This will do for setting the ssl flag...it could be done earlier if it's needed. But this seems neater.
 746                         User* u = ServerInstance->FindDescriptor(session->fd);
 747                         if (u)
 748                         {
 749                                 if (!u->GetExt("ssl", dummy))
 750                                         u->Extend("ssl", "ON");
 751                         }
 752
 753                         session->status = ISSL_OPEN;
 754
 755                         MakePollWrite(session);
 756
 757                         return true;
 758                 }
 759                 else if (ret == 0)
 760                 {
 761                         CloseSession(session);
 762                         return true;
 763                 }
 764
 765                 return true;
 766         }
 767
 768         virtual void OnPostConnect(User* user)
 769         {
 770                 // This occurs AFTER OnUserConnect so we can be sure the
 771                 // protocol module has propagated the NICK message.
 772                 if ((user->GetExt("ssl", dummy)) && (IS_LOCAL(user)))
 773                 {
 774                         // Tell whatever protocol module we're using that we need to inform other servers of this metadata NOW.
 775                         std::deque<std::string>* metadata = new std::deque<std::string>;
 776                         metadata->push_back(user->nick);
 777                         metadata->push_back("ssl");             // The metadata id
 778                         metadata->push_back("ON");              // The value to send
 779                         Event* event = new Event((char*)metadata,(Module*)this,"send_metadata");
 780                         event->Send(ServerInstance);            // Trigger the event. We don't care what module picks it up.
 781                         delete event;
 782                         delete metadata;
 783
 784                         VerifyCertificate(&sessions[user->GetFd()], user);
 785                         if (sessions[user->GetFd()].sess)
 786                                 user->WriteServ("NOTICE %s :*** You are connected using SSL cipher \"%s\"", user->nick, SSL_get_cipher(sessions[user->GetFd()].sess));
 787                 }
 788         }
 789
 790         void MakePollWrite(issl_session* session)
 791         {
 792                 //OnRawSocketWrite(session->fd, NULL, 0);
 793                 EventHandler* eh = ServerInstance->FindDescriptor(session->fd);
 794                 if (eh)
 795                 {
 796                         ServerInstance->SE->WantWrite(eh);
 797                 }
 798         }
 799
 800         virtual void OnBufferFlushed(User* user)
 801         {
 802                 if (user->GetExt("ssl"))
 803                 {
 804                         issl_session* session = &sessions[user->GetFd()];
 805                         if (session && session->outbuf.size())
 806                                 OnRawSocketWrite(user->GetFd(), NULL, 0);
 807                 }
 808         }
 809
 810         void CloseSession(issl_session* session)
 811         {
 812                 if (session->sess)
 813                 {
 814                         SSL_shutdown(session->sess);
 815                         SSL_free(session->sess);
 816                 }
 817
 818                 if (session->inbuf)
 819                 {
 820                         delete[] session->inbuf;
 821                 }
 822
 823                 session->outbuf.clear();
 824                 session->inbuf = NULL;
 825                 session->sess = NULL;
 826                 session->status = ISSL_NONE;
 827         }
 828
 829         void VerifyCertificate(issl_session* session, Extensible* user)
 830         {
 831                 if (!session->sess || !user)
 832                         return;
 833
 834                 X509* cert;
 835                 ssl_cert* certinfo = new ssl_cert;
 836                 unsigned int n;
 837                 unsigned char md[EVP_MAX_MD_SIZE];
 838                 const EVP_MD *digest = EVP_md5();
 839
 840                 user->Extend("ssl_cert",certinfo);
 841
 842                 cert = SSL_get_peer_certificate((SSL*)session->sess);
 843
 844                 if (!cert)
 845                 {
 846                         certinfo->data.insert(std::make_pair("error","Could not get peer certificate: "+std::string(get_error())));
 847                         return;
 848                 }
 849
 850                 certinfo->data.insert(std::make_pair("invalid", SSL_get_verify_result(session->sess) != X509_V_OK ? ConvToStr(1) : ConvToStr(0)));
 851
 852                 if (SelfSigned)
 853                 {
 854                         certinfo->data.insert(std::make_pair("unknownsigner",ConvToStr(0)));
 855                         certinfo->data.insert(std::make_pair("trusted",ConvToStr(1)));
 856                 }
 857                 else
 858                 {
 859                         certinfo->data.insert(std::make_pair("unknownsigner",ConvToStr(1)));
 860                         certinfo->data.insert(std::make_pair("trusted",ConvToStr(0)));
 861                 }
 862
 863                 certinfo->data.insert(std::make_pair("dn",std::string(X509_NAME_oneline(X509_get_subject_name(cert),0,0))));
 864                 certinfo->data.insert(std::make_pair("issuer",std::string(X509_NAME_oneline(X509_get_issuer_name(cert),0,0))));
 865
 866                 if (!X509_digest(cert, digest, md, &n))
 867                 {
 868                         certinfo->data.insert(std::make_pair("error","Out of memory generating fingerprint"));
 869                 }
 870                 else
 871                 {
 872                         certinfo->data.insert(std::make_pair("fingerprint",irc::hex(md, n)));
 873                 }
 874
 875                 if ((ASN1_UTCTIME_cmp_time_t(X509_get_notAfter(cert), time(NULL)) == -1) || (ASN1_UTCTIME_cmp_time_t(X509_get_notBefore(cert), time(NULL)) == 0))
 876                 {
 877                         certinfo->data.insert(std::make_pair("error","Not activated, or expired certificate"));
 878                 }
 879
 880                 X509_free(cert);
 881         }
 882 };
 883
 884 static int error_callback(const char *str, size_t len, void *u)
 885 {
 886         ModuleSSLOpenSSL* mssl = (ModuleSSLOpenSSL*)u;
 887         mssl->PublicInstance->Logs->Log("m_ssl_openssl",DEFAULT, "SSL error: " + std::string(str, len - 1));
 888         return 0;
 889 }
 890
 891 MODULE_INIT(ModuleSSLOpenSSL)