src/modules/extra/m_ssl_openssl.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2007 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 #ifdef WINDOWS
  20 #include <openssl/applink.c>
  21 #endif
  22
  23 #include "configreader.h"
  24 #include "users.h"
  25 #include "channels.h"
  26 #include "modules.h"
  27
  28 #include "socket.h"
  29 #include "hashcomp.h"
  30
  31 #include "transport.h"
  32
  33 #ifdef WINDOWS
  34 #pragma comment(lib, "libeay32MTd")
  35 #pragma comment(lib, "ssleay32MTd")
  36 #undef MAX_DESCRIPTORS
  37 #define MAX_DESCRIPTORS 10000
  38 #endif
  39
  40 /* $ModDesc: Provides SSL support for clients */
  41 /* $CompileFlags: pkgconfversion("openssl","0.9.7") pkgconfincludes("openssl","/openssl/ssl.h","") */
  42 /* $LinkerFlags: rpath("pkg-config --libs openssl") pkgconflibs("openssl","/libssl.so","-lssl -lcrypto -ldl") */
  43 /* $ModDep: transport.h */
  44 /* $NoPedantic */
  45 /* $CopyInstall: conf/key.pem $(CONPATH) */
  46 /* $CopyInstall: conf/cert.pem $(CONPATH) */
  47
  48 enum issl_status { ISSL_NONE, ISSL_HANDSHAKING, ISSL_OPEN };
  49 enum issl_io_status { ISSL_WRITE, ISSL_READ };
  50
  51 static bool SelfSigned = false;
  52
  53 bool isin(int port, const std::vector<int> &portlist)
  54 {
  55         for(unsigned int i = 0; i < portlist.size(); i++)
  56                 if(portlist[i] == port)
  57                         return true;
  58
  59         return false;
  60 }
  61
  62 char* get_error()
  63 {
  64         return ERR_error_string(ERR_get_error(), NULL);
  65 }
  66
  67 static int error_callback(const char *str, size_t len, void *u);
  68
  69 /** Represents an SSL user's extra data
  70  */
  71 class issl_session : public classbase
  72 {
  73 public:
  74         SSL* sess;
  75         issl_status status;
  76         issl_io_status rstat;
  77         issl_io_status wstat;
  78
  79         unsigned int inbufoffset;
  80         char* inbuf;                    // Buffer OpenSSL reads into.
  81         std::string outbuf;     // Buffer for outgoing data that OpenSSL will not take.
  82         int fd;
  83         bool outbound;
  84
  85         issl_session()
  86         {
  87                 outbound = false;
  88                 rstat = ISSL_READ;
  89                 wstat = ISSL_WRITE;
  90         }
  91 };
  92
  93 static int OnVerify(int preverify_ok, X509_STORE_CTX *ctx)
  94 {
  95         /* XXX: This will allow self signed certificates.
  96          * In the future if we want an option to not allow this,
  97          * we can just return preverify_ok here, and openssl
  98          * will boot off self-signed and invalid peer certs.
  99          */
 100         int ve = X509_STORE_CTX_get_error(ctx);
 101
 102         SelfSigned = (ve == X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT);
 103
 104         return 1;
 105 }
 106
 107 class ModuleSSLOpenSSL : public Module
 108 {
 109         std::vector<int> listenports;
 110
 111         int inbufsize;
 112         issl_session sessions[MAX_DESCRIPTORS];
 113
 114         SSL_CTX* ctx;
 115         SSL_CTX* clictx;
 116
 117         char* dummy;
 118         char cipher[MAXBUF];
 119
 120         std::string keyfile;
 121         std::string certfile;
 122         std::string cafile;
 123         // std::string crlfile;
 124         std::string dhfile;
 125         std::string sslports;
 126
 127         int clientactive;
 128
 129  public:
 130
 131         InspIRCd* PublicInstance;
 132
 133         ModuleSSLOpenSSL(InspIRCd* Me)
 134         : Module(Me), PublicInstance(Me)
 135         {
 136                 ServerInstance->Modules->PublishInterface("BufferedSocketHook", this);
 137
 138                 // Not rehashable...because I cba to reduce all the sizes of existing buffers.
 139                 inbufsize = ServerInstance->Config->NetBufferSize;
 140
 141                 /* Global SSL library initialization*/
 142                 SSL_library_init();
 143                 SSL_load_error_strings();
 144
 145                 /* Build our SSL contexts:
 146                  * NOTE: OpenSSL makes us have two contexts, one for servers and one for clients. ICK.
 147                  */
 148                 ctx = SSL_CTX_new( SSLv23_server_method() );
 149                 clictx = SSL_CTX_new( SSLv23_client_method() );
 150
 151                 SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER | SSL_VERIFY_CLIENT_ONCE, OnVerify);
 152                 SSL_CTX_set_verify(clictx, SSL_VERIFY_PEER | SSL_VERIFY_CLIENT_ONCE, OnVerify);
 153
 154                 // Needs the flag as it ignores a plain /rehash
 155                 OnRehash(NULL,"ssl");
 156         }
 157
 158         virtual void OnRehash(User* user, const std::string &param)
 159         {
 160                 if (param != "ssl")
 161                         return;
 162
 163                 ConfigReader Conf(ServerInstance);
 164
 165                 for (unsigned int i = 0; i < listenports.size(); i++)
 166                 {
 167                         ServerInstance->Config->DelIOHook(listenports[i]);
 168                 }
 169
 170                 listenports.clear();
 171                 clientactive = 0;
 172                 sslports.clear();
 173
 174                 for (int i = 0; i < Conf.Enumerate("bind"); i++)
 175                 {
 176                         // For each <bind> tag
 177                         std::string x = Conf.ReadValue("bind", "type", i);
 178                         if (((x.empty()) || (x == "clients")) && (Conf.ReadValue("bind", "ssl", i) == "openssl"))
 179                         {
 180                                 // Get the port we're meant to be listening on with SSL
 181                                 std::string port = Conf.ReadValue("bind", "port", i);
 182                                 irc::portparser portrange(port, false);
 183                                 long portno = -1;
 184                                 while ((portno = portrange.GetToken()))
 185                                 {
 186                                         clientactive++;
 187                                         try
 188                                         {
 189                                                 if (ServerInstance->Config->AddIOHook(portno, this))
 190                                                 {
 191                                                         listenports.push_back(portno);
 192                                                                 for (size_t i = 0; i < ServerInstance->Config->ports.size(); i++)
 193                                                                 if (ServerInstance->Config->ports[i]->GetPort() == portno)
 194                                                                         ServerInstance->Config->ports[i]->SetDescription("ssl");
 195                                                         ServerInstance->Log(DEFAULT, "m_ssl_openssl.so: Enabling SSL for port %d", portno);
 196                                                         sslports.append("*:").append(ConvToStr(portno)).append(";");
 197                                                 }
 198                                                 else
 199                                                 {
 200                                                         ServerInstance->Log(DEFAULT, "m_ssl_openssl.so: FAILED to enable SSL on port %d, maybe you have another ssl or similar module loaded?", portno);
 201                                                 }
 202                                         }
 203                                         catch (ModuleException &e)
 204                                         {
 205                                                 ServerInstance->Log(DEFAULT, "m_ssl_openssl.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 another SSL or similar module loaded?", portno, e.GetReason());
 206                                         }
 207                                 }
 208                         }
 209                 }
 210
 211                 if (!sslports.empty())
 212                         sslports.erase(sslports.end() - 1);
 213
 214                 std::string confdir(ServerInstance->ConfigFileName);
 215                 // +1 so we the path ends with a /
 216                 confdir = confdir.substr(0, confdir.find_last_of('/') + 1);
 217
 218                 cafile   = Conf.ReadValue("openssl", "cafile", 0);
 219                 certfile = Conf.ReadValue("openssl", "certfile", 0);
 220                 keyfile  = Conf.ReadValue("openssl", "keyfile", 0);
 221                 dhfile   = Conf.ReadValue("openssl", "dhfile", 0);
 222
 223                 // Set all the default values needed.
 224                 if (cafile.empty())
 225                         cafile = "ca.pem";
 226
 227                 if (certfile.empty())
 228                         certfile = "cert.pem";
 229
 230                 if (keyfile.empty())
 231                         keyfile = "key.pem";
 232
 233                 if (dhfile.empty())
 234                         dhfile = "dhparams.pem";
 235
 236                 // Prepend relative paths with the path to the config directory.
 237                 if (cafile[0] != '/')
 238                         cafile = confdir + cafile;
 239
 240                 if (certfile[0] != '/')
 241                         certfile = confdir + certfile;
 242
 243                 if (keyfile[0] != '/')
 244                         keyfile = confdir + keyfile;
 245
 246                 if (dhfile[0] != '/')
 247                         dhfile = confdir + dhfile;
 248
 249                 /* Load our keys and certificates
 250                  * NOTE: OpenSSL's error logging API sucks, don't blame us for this clusterfuck.
 251                  */
 252                 if ((!SSL_CTX_use_certificate_chain_file(ctx, certfile.c_str())) || (!SSL_CTX_use_certificate_chain_file(clictx, certfile.c_str())))
 253                 {
 254                         ServerInstance->Log(DEFAULT, "m_ssl_openssl.so: Can't read certificate file %s. %s", certfile.c_str(), strerror(errno));
 255                         ERR_print_errors_cb(error_callback, this);
 256                 }
 257
 258                 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)))
 259                 {
 260                         ServerInstance->Log(DEFAULT, "m_ssl_openssl.so: Can't read key file %s. %s", keyfile.c_str(), strerror(errno));
 261                         ERR_print_errors_cb(error_callback, this);
 262                 }
 263
 264                 /* Load the CAs we trust*/
 265                 if (((!SSL_CTX_load_verify_locations(ctx, cafile.c_str(), 0))) || (!SSL_CTX_load_verify_locations(clictx, cafile.c_str(), 0)))
 266                 {
 267                         ServerInstance->Log(DEFAULT, "m_ssl_openssl.so: Can't read CA list from %s. %s", cafile.c_str(), strerror(errno));
 268                         ERR_print_errors_cb(error_callback, this);
 269                 }
 270
 271                 FILE* dhpfile = fopen(dhfile.c_str(), "r");
 272                 DH* ret;
 273
 274                 if (dhpfile == NULL)
 275                 {
 276                         ServerInstance->Log(DEFAULT, "m_ssl_openssl.so Couldn't open DH file %s: %s", dhfile.c_str(), strerror(errno));
 277                         throw ModuleException("Couldn't open DH file " + dhfile + ": " + strerror(errno));
 278                 }
 279                 else
 280                 {
 281                         ret = PEM_read_DHparams(dhpfile, NULL, NULL, NULL);
 282                         if ((SSL_CTX_set_tmp_dh(ctx, ret) < 0) || (SSL_CTX_set_tmp_dh(clictx, ret) < 0))
 283                         {
 284                                 ServerInstance->Log(DEFAULT, "m_ssl_openssl.so: Couldn't set DH parameters %s. SSL errors follow:", dhfile.c_str());
 285                                 ERR_print_errors_cb(error_callback, this);
 286                         }
 287                 }
 288
 289                 fclose(dhpfile);
 290         }
 291
 292         virtual void On005Numeric(std::string &output)
 293         {
 294                 output.append(" SSL=" + sslports);
 295         }
 296
 297         virtual ~ModuleSSLOpenSSL()
 298         {
 299                 SSL_CTX_free(ctx);
 300                 SSL_CTX_free(clictx);
 301         }
 302
 303         virtual void OnCleanup(int target_type, void* item)
 304         {
 305                 if (target_type == TYPE_USER)
 306                 {
 307                         User* user = (User*)item;
 308
 309                         if (user->GetExt("ssl", dummy) && IS_LOCAL(user) && isin(user->GetPort(), listenports))
 310                         {
 311                                 // User is using SSL, they're a local user, and they're using one of *our* SSL ports.
 312                                 // Potentially there could be multiple SSL modules loaded at once on different ports.
 313                                 User::QuitUser(ServerInstance, user, "SSL module unloading");
 314                         }
 315                         if (user->GetExt("ssl_cert", dummy) && isin(user->GetPort(), listenports))
 316                         {
 317                                 ssl_cert* tofree;
 318                                 user->GetExt("ssl_cert", tofree);
 319                                 delete tofree;
 320                                 user->Shrink("ssl_cert");
 321                         }
 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                                 ServerInstance->Config->DelIOHook(listenports[i]);
 332                                 for (size_t j = 0; j < ServerInstance->Config->ports.size(); j++)
 333                                         if (ServerInstance->Config->ports[j]->GetPort() == listenports[i])
 334                                                 ServerInstance->Config->ports[j]->SetDescription("plaintext");
 335                         }
 336                 }
 337         }
 338
 339         virtual Version GetVersion()
 340         {
 341                 return Version(1, 1, 0, 0, VF_VENDOR, API_VERSION);
 342         }
 343
 344         void Implements(char* List)
 345         {
 346                 List[I_OnRawSocketConnect] = List[I_OnRawSocketAccept] = List[I_OnRawSocketClose] = List[I_OnRawSocketRead] = List[I_OnRawSocketWrite] = List[I_OnCleanup] = List[I_On005Numeric] = 1;
 347                 List[I_OnBufferFlushed] = List[I_OnRequest] = List[I_OnSyncUserMetaData] = List[I_OnDecodeMetaData] = List[I_OnUnloadModule] = List[I_OnRehash] = List[I_OnWhois] = List[I_OnPostConnect] = 1;
 348         }
 349
 350         virtual char* OnRequest(Request* request)
 351         {
 352                 ISHRequest* ISR = (ISHRequest*)request;
 353                 if (strcmp("IS_NAME", request->GetId()) == 0)
 354                 {
 355                         return "openssl";
 356                 }
 357                 else if (strcmp("IS_HOOK", request->GetId()) == 0)
 358                 {
 359                         char* ret = "OK";
 360                         try
 361                         {
 362                                 ret = ServerInstance->Config->AddIOHook((Module*)this, (BufferedSocket*)ISR->Sock) ? (char*)"OK" : NULL;
 363                         }
 364                         catch (ModuleException &e)
 365                         {
 366                                 return NULL;
 367                         }
 368
 369                         return ret;
 370                 }
 371                 else if (strcmp("IS_UNHOOK", request->GetId()) == 0)
 372                 {
 373                         return ServerInstance->Config->DelIOHook((BufferedSocket*)ISR->Sock) ? (char*)"OK" : NULL;
 374                 }
 375                 else if (strcmp("IS_HSDONE", request->GetId()) == 0)
 376                 {
 377                         if (ISR->Sock->GetFd() < 0)
 378                                 return (char*)"OK";
 379
 380                         issl_session* session = &sessions[ISR->Sock->GetFd()];
 381                         return (session->status == ISSL_HANDSHAKING) ? NULL : (char*)"OK";
 382                 }
 383                 else if (strcmp("IS_ATTACH", request->GetId()) == 0)
 384                 {
 385                         issl_session* session = &sessions[ISR->Sock->GetFd()];
 386                         if (session->sess)
 387                         {
 388                                 VerifyCertificate(session, (BufferedSocket*)ISR->Sock);
 389                                 return "OK";
 390                         }
 391                 }
 392                 return NULL;
 393         }
 394
 395
 396         virtual void OnRawSocketAccept(int fd, const std::string &ip, int localport)
 397         {
 398                 /* Are there any possibilities of an out of range fd? Hope not, but lets be paranoid */
 399                 if ((fd < 0) || (fd > MAX_DESCRIPTORS))
 400                         return;
 401
 402                 issl_session* session = &sessions[fd];
 403
 404                 session->fd = fd;
 405                 session->inbuf = new char[inbufsize];
 406                 session->inbufoffset = 0;
 407                 session->sess = SSL_new(ctx);
 408                 session->status = ISSL_NONE;
 409                 session->outbound = false;
 410
 411                 if (session->sess == NULL)
 412                         return;
 413
 414                 if (SSL_set_fd(session->sess, fd) == 0)
 415                 {
 416                         ServerInstance->Log(DEBUG,"BUG: Can't set fd with SSL_set_fd: %d", fd);
 417                         return;
 418                 }
 419
 420                 Handshake(session);
 421         }
 422
 423         virtual void OnRawSocketConnect(int fd)
 424         {
 425                 /* Are there any possibilities of an out of range fd? Hope not, but lets be paranoid */
 426                 if ((fd < 0) || (fd > MAX_DESCRIPTORS))
 427                         return;
 428
 429                 issl_session* session = &sessions[fd];
 430
 431                 session->fd = fd;
 432                 session->inbuf = new char[inbufsize];
 433                 session->inbufoffset = 0;
 434                 session->sess = SSL_new(clictx);
 435                 session->status = ISSL_NONE;
 436                 session->outbound = true;
 437
 438                 if (session->sess == NULL)
 439                         return;
 440
 441                 if (SSL_set_fd(session->sess, fd) == 0)
 442                 {
 443                         ServerInstance->Log(DEBUG,"BUG: Can't set fd with SSL_set_fd: %d", fd);
 444                         return;
 445                 }
 446
 447                 Handshake(session);
 448         }
 449
 450         virtual void OnRawSocketClose(int fd)
 451         {
 452                 /* Are there any possibilities of an out of range fd? Hope not, but lets be paranoid */
 453                 if ((fd < 0) || (fd > MAX_DESCRIPTORS))
 454                         return;
 455
 456                 CloseSession(&sessions[fd]);
 457
 458                 EventHandler* user = ServerInstance->SE->GetRef(fd);
 459
 460                 if ((user) && (user->GetExt("ssl_cert", dummy)))
 461                 {
 462                         ssl_cert* tofree;
 463                         user->GetExt("ssl_cert", tofree);
 464                         delete tofree;
 465                         user->Shrink("ssl_cert");
 466                 }
 467         }
 468
 469         virtual int OnRawSocketRead(int fd, char* buffer, unsigned int count, int &readresult)
 470         {
 471                 /* Are there any possibilities of an out of range fd? Hope not, but lets be paranoid */
 472                 if ((fd < 0) || (fd > MAX_DESCRIPTORS))
 473                         return 0;
 474
 475                 issl_session* session = &sessions[fd];
 476
 477                 if (!session->sess)
 478                 {
 479                         readresult = 0;
 480                         CloseSession(session);
 481                         return 1;
 482                 }
 483
 484                 if (session->status == ISSL_HANDSHAKING)
 485                 {
 486                         if (session->rstat == ISSL_READ || session->wstat == ISSL_READ)
 487                         {
 488                                 // The handshake isn't finished and it wants to read, try to finish it.
 489                                 if (!Handshake(session))
 490                                 {
 491                                         // Couldn't resume handshake.
 492                                         return -1;
 493                                 }
 494                         }
 495                         else
 496                         {
 497                                 errno = EAGAIN;
 498                                 return -1;
 499                         }
 500                 }
 501
 502                 // If we resumed the handshake then session->status will be ISSL_OPEN
 503
 504                 if (session->status == ISSL_OPEN)
 505                 {
 506                         if (session->wstat == ISSL_READ)
 507                         {
 508                                 if(DoWrite(session) == 0)
 509                                         return 0;
 510                         }
 511
 512                         if (session->rstat == ISSL_READ)
 513                         {
 514                                 int ret = DoRead(session);
 515
 516                                 if (ret > 0)
 517                                 {
 518                                         if (count <= session->inbufoffset)
 519                                         {
 520                                                 memcpy(buffer, session->inbuf, count);
 521                                                 // Move the stuff left in inbuf to the beginning of it
 522                                                 memcpy(session->inbuf, session->inbuf + count, (session->inbufoffset - count));
 523                                                 // Now we need to set session->inbufoffset to the amount of data still waiting to be handed to insp.
 524                                                 session->inbufoffset -= count;
 525                                                 // Insp uses readresult as the count of how much data there is in buffer, so:
 526                                                 readresult = count;
 527                                         }
 528                                         else
 529                                         {
 530                                                 // There's not as much in the inbuf as there is space in the buffer, so just copy the whole thing.
 531                                                 memcpy(buffer, session->inbuf, session->inbufoffset);
 532
 533                                                 readresult = session->inbufoffset;
 534                                                 // Zero the offset, as there's nothing there..
 535                                                 session->inbufoffset = 0;
 536                                         }
 537                                         return 1;
 538                                 }
 539                                 return ret;
 540                         }
 541                 }
 542
 543                 return -1;
 544         }
 545
 546         virtual int OnRawSocketWrite(int fd, const char* buffer, int count)
 547         {
 548                 /* Are there any possibilities of an out of range fd? Hope not, but lets be paranoid */
 549                 if ((fd < 0) || (fd > MAX_DESCRIPTORS))
 550                         return 0;
 551
 552                 issl_session* session = &sessions[fd];
 553
 554                 if (!session->sess)
 555                 {
 556                         CloseSession(session);
 557                         return -1;
 558                 }
 559
 560                 session->outbuf.append(buffer, count);
 561                 MakePollWrite(session);
 562
 563                 if (session->status == ISSL_HANDSHAKING)
 564                 {
 565                         // The handshake isn't finished, try to finish it.
 566                         if (session->rstat == ISSL_WRITE || session->wstat == ISSL_WRITE)
 567                         {
 568                                 Handshake(session);
 569                         }
 570                 }
 571
 572                 if (session->status == ISSL_OPEN)
 573                 {
 574                         if (session->rstat == ISSL_WRITE)
 575                         {
 576                                 DoRead(session);
 577                         }
 578
 579                         if (session->wstat == ISSL_WRITE)
 580                         {
 581                                 return DoWrite(session);
 582                         }
 583                 }
 584
 585                 return 1;
 586         }
 587
 588         int DoWrite(issl_session* session)
 589         {
 590                 if (!session->outbuf.size())
 591                         return -1;
 592
 593                 int ret = SSL_write(session->sess, session->outbuf.data(), session->outbuf.size());
 594
 595                 if (ret == 0)
 596                 {
 597                         CloseSession(session);
 598                         return 0;
 599                 }
 600                 else if (ret < 0)
 601                 {
 602                         int err = SSL_get_error(session->sess, ret);
 603
 604                         if (err == SSL_ERROR_WANT_WRITE)
 605                         {
 606                                 session->wstat = ISSL_WRITE;
 607                                 return -1;
 608                         }
 609                         else if (err == SSL_ERROR_WANT_READ)
 610                         {
 611                                 session->wstat = ISSL_READ;
 612                                 return -1;
 613                         }
 614                         else
 615                         {
 616                                 CloseSession(session);
 617                                 return 0;
 618                         }
 619                 }
 620                 else
 621                 {
 622                         session->outbuf = session->outbuf.substr(ret);
 623                         return ret;
 624                 }
 625         }
 626
 627         int DoRead(issl_session* session)
 628         {
 629                 // Is this right? Not sure if the unencrypted data is garaunteed to be the same length.
 630                 // Read into the inbuffer, offset from the beginning by the amount of data we have that insp hasn't taken yet.
 631
 632                 int ret = SSL_read(session->sess, session->inbuf + session->inbufoffset, inbufsize - session->inbufoffset);
 633
 634                 if (ret == 0)
 635                 {
 636                         // Client closed connection.
 637                         CloseSession(session);
 638                         return 0;
 639                 }
 640                 else if (ret < 0)
 641                 {
 642                         int err = SSL_get_error(session->sess, ret);
 643
 644                         if (err == SSL_ERROR_WANT_READ)
 645                         {
 646                                 session->rstat = ISSL_READ;
 647                                 return -1;
 648                         }
 649                         else if (err == SSL_ERROR_WANT_WRITE)
 650                         {
 651                                 session->rstat = ISSL_WRITE;
 652                                 MakePollWrite(session);
 653                                 return -1;
 654                         }
 655                         else
 656                         {
 657                                 CloseSession(session);
 658                                 return 0;
 659                         }
 660                 }
 661                 else
 662                 {
 663                         // Read successfully 'ret' bytes into inbuf + inbufoffset
 664                         // There are 'ret' + 'inbufoffset' bytes of data in 'inbuf'
 665                         // 'buffer' is 'count' long
 666
 667                         session->inbufoffset += ret;
 668
 669                         return ret;
 670                 }
 671         }
 672
 673         // :kenny.chatspike.net 320 Om Epy|AFK :is a Secure Connection
 674         virtual void OnWhois(User* source, User* dest)
 675         {
 676                 if (!clientactive)
 677                         return;
 678
 679                 // Bugfix, only send this numeric for *our* SSL users
 680                 if (dest->GetExt("ssl", dummy) || (IS_LOCAL(dest) &&  isin(dest->GetPort(), listenports)))
 681                 {
 682                         ServerInstance->SendWhoisLine(source, dest, 320, "%s %s :is using a secure connection", source->nick, dest->nick);
 683                 }
 684         }
 685
 686         virtual void OnSyncUserMetaData(User* user, Module* proto, void* opaque, const std::string &extname, bool displayable)
 687         {
 688                 // check if the linking module wants to know about OUR metadata
 689                 if (extname == "ssl")
 690                 {
 691                         // check if this user has an swhois field to send
 692                         if(user->GetExt(extname, dummy))
 693                         {
 694                                 // call this function in the linking module, let it format the data how it
 695                                 // sees fit, and send it on its way. We dont need or want to know how.
 696                                 proto->ProtoSendMetaData(opaque, TYPE_USER, user, extname, displayable ? "Enabled" : "ON");
 697                         }
 698                 }
 699         }
 700
 701         virtual void OnDecodeMetaData(int target_type, void* target, const std::string &extname, const std::string &extdata)
 702         {
 703                 // check if its our metadata key, and its associated with a user
 704                 if ((target_type == TYPE_USER) && (extname == "ssl"))
 705                 {
 706                         User* dest = (User*)target;
 707                         // if they dont already have an ssl flag, accept the remote server's
 708                         if (!dest->GetExt(extname, dummy))
 709                         {
 710                                 dest->Extend(extname, "ON");
 711                         }
 712                 }
 713         }
 714
 715         bool Handshake(issl_session* session)
 716         {
 717                 int ret;
 718
 719                 if (session->outbound)
 720                         ret = SSL_connect(session->sess);
 721                 else
 722                         ret = SSL_accept(session->sess);
 723
 724                 if (ret < 0)
 725                 {
 726                         int err = SSL_get_error(session->sess, ret);
 727
 728                         if (err == SSL_ERROR_WANT_READ)
 729                         {
 730                                 session->rstat = ISSL_READ;
 731                                 session->status = ISSL_HANDSHAKING;
 732                                 return true;
 733                         }
 734                         else if (err == SSL_ERROR_WANT_WRITE)
 735                         {
 736                                 session->wstat = ISSL_WRITE;
 737                                 session->status = ISSL_HANDSHAKING;
 738                                 MakePollWrite(session);
 739                                 return true;
 740                         }
 741                         else
 742                         {
 743                                 CloseSession(session);
 744                         }
 745
 746                         return false;
 747                 }
 748                 else if (ret > 0)
 749                 {
 750                         // Handshake complete.
 751                         // This will do for setting the ssl flag...it could be done earlier if it's needed. But this seems neater.
 752                         User* u = ServerInstance->FindDescriptor(session->fd);
 753                         if (u)
 754                         {
 755                                 if (!u->GetExt("ssl", dummy))
 756                                         u->Extend("ssl", "ON");
 757                         }
 758
 759                         session->status = ISSL_OPEN;
 760
 761                         MakePollWrite(session);
 762
 763                         return true;
 764                 }
 765                 else if (ret == 0)
 766                 {
 767                         CloseSession(session);
 768                         return true;
 769                 }
 770
 771                 return true;
 772         }
 773
 774         virtual void OnPostConnect(User* user)
 775         {
 776                 // This occurs AFTER OnUserConnect so we can be sure the
 777                 // protocol module has propagated the NICK message.
 778                 if ((user->GetExt("ssl", dummy)) && (IS_LOCAL(user)))
 779                 {
 780                         // Tell whatever protocol module we're using that we need to inform other servers of this metadata NOW.
 781                         std::deque<std::string>* metadata = new std::deque<std::string>;
 782                         metadata->push_back(user->nick);
 783                         metadata->push_back("ssl");             // The metadata id
 784                         metadata->push_back("ON");              // The value to send
 785                         Event* event = new Event((char*)metadata,(Module*)this,"send_metadata");
 786                         event->Send(ServerInstance);            // Trigger the event. We don't care what module picks it up.
 787                         DELETE(event);
 788                         DELETE(metadata);
 789
 790                         VerifyCertificate(&sessions[user->GetFd()], user);
 791                         if (sessions[user->GetFd()].sess)
 792                                 user->WriteServ("NOTICE %s :*** You are connected using SSL cipher \"%s\"", user->nick, SSL_get_cipher(sessions[user->GetFd()].sess));
 793                 }
 794         }
 795
 796         void MakePollWrite(issl_session* session)
 797         {
 798                 //OnRawSocketWrite(session->fd, NULL, 0);
 799                 EventHandler* eh = ServerInstance->FindDescriptor(session->fd);
 800                 if (eh)
 801                 {
 802                         ServerInstance->SE->WantWrite(eh);
 803                 }
 804         }
 805
 806         virtual void OnBufferFlushed(User* user)
 807         {
 808                 if (user->GetExt("ssl"))
 809                 {
 810                         issl_session* session = &sessions[user->GetFd()];
 811                         if (session && session->outbuf.size())
 812                                 OnRawSocketWrite(user->GetFd(), NULL, 0);
 813                 }
 814         }
 815
 816         void CloseSession(issl_session* session)
 817         {
 818                 if (session->sess)
 819                 {
 820                         SSL_shutdown(session->sess);
 821                         SSL_free(session->sess);
 822                 }
 823
 824                 if (session->inbuf)
 825                 {
 826                         delete[] session->inbuf;
 827                 }
 828
 829                 session->outbuf.clear();
 830                 session->inbuf = NULL;
 831                 session->sess = NULL;
 832                 session->status = ISSL_NONE;
 833         }
 834
 835         void VerifyCertificate(issl_session* session, Extensible* user)
 836         {
 837                 if (!session->sess || !user)
 838                         return;
 839
 840                 X509* cert;
 841                 ssl_cert* certinfo = new ssl_cert;
 842                 unsigned int n;
 843                 unsigned char md[EVP_MAX_MD_SIZE];
 844                 const EVP_MD *digest = EVP_md5();
 845
 846                 user->Extend("ssl_cert",certinfo);
 847
 848                 cert = SSL_get_peer_certificate((SSL*)session->sess);
 849
 850                 if (!cert)
 851                 {
 852                         certinfo->data.insert(std::make_pair("error","Could not get peer certificate: "+std::string(get_error())));
 853                         return;
 854                 }
 855
 856                 certinfo->data.insert(std::make_pair("invalid", SSL_get_verify_result(session->sess) != X509_V_OK ? ConvToStr(1) : ConvToStr(0)));
 857
 858                 if (SelfSigned)
 859                 {
 860                         certinfo->data.insert(std::make_pair("unknownsigner",ConvToStr(0)));
 861                         certinfo->data.insert(std::make_pair("trusted",ConvToStr(1)));
 862                 }
 863                 else
 864                 {
 865                         certinfo->data.insert(std::make_pair("unknownsigner",ConvToStr(1)));
 866                         certinfo->data.insert(std::make_pair("trusted",ConvToStr(0)));
 867                 }
 868
 869                 certinfo->data.insert(std::make_pair("dn",std::string(X509_NAME_oneline(X509_get_subject_name(cert),0,0))));
 870                 certinfo->data.insert(std::make_pair("issuer",std::string(X509_NAME_oneline(X509_get_issuer_name(cert),0,0))));
 871
 872                 if (!X509_digest(cert, digest, md, &n))
 873                 {
 874                         certinfo->data.insert(std::make_pair("error","Out of memory generating fingerprint"));
 875                 }
 876                 else
 877                 {
 878                         certinfo->data.insert(std::make_pair("fingerprint",irc::hex(md, n)));
 879                 }
 880
 881                 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))
 882                 {
 883                         certinfo->data.insert(std::make_pair("error","Not activated, or expired certificate"));
 884                 }
 885
 886                 X509_free(cert);
 887         }
 888 };
 889
 890 static int error_callback(const char *str, size_t len, void *u)
 891 {
 892         ModuleSSLOpenSSL* mssl = (ModuleSSLOpenSSL*)u;
 893         mssl->PublicInstance->Log(DEFAULT, "SSL error: " + std::string(str, len - 1));
 894         return 0;
 895 }
 896
 897 MODULE_INIT(ModuleSSLOpenSSL)