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 <string>
  15 #include <vector>
  16
  17 #include <openssl/ssl.h>
  18 #include <openssl/err.h>
  19
  20 #include "inspircd_config.h"
  21 #include "configreader.h"
  22 #include "users.h"
  23 #include "channels.h"
  24 #include "modules.h"
  25
  26 #include "socket.h"
  27 #include "hashcomp.h"
  28 #include "inspircd.h"
  29
  30 #include "transport.h"
  31
  32 /* $ModDesc: Provides SSL support for clients */
  33 /* $CompileFlags: `perl extra/openssl_config.pl compile` */
  34 /* $LinkerFlags: `perl extra/openssl_config.pl link` */
  35 /* $ModDep: transport.h */
  36
  37 enum issl_status { ISSL_NONE, ISSL_HANDSHAKING, ISSL_OPEN };
  38 enum issl_io_status { ISSL_WRITE, ISSL_READ };
  39
  40 static bool SelfSigned = false;
  41
  42 bool isin(int port, const std::vector<int> &portlist)
  43 {
  44         for(unsigned int i = 0; i < portlist.size(); i++)
  45                 if(portlist[i] == port)
  46                         return true;
  47
  48         return false;
  49 }
  50
  51 char* get_error()
  52 {
  53         return ERR_error_string(ERR_get_error(), NULL);
  54 }
  55
  56 /** Represents an SSL user's extra data
  57  */
  58 class issl_session : public classbase
  59 {
  60 public:
  61         SSL* sess;
  62         issl_status status;
  63         issl_io_status rstat;
  64         issl_io_status wstat;
  65
  66         unsigned int inbufoffset;
  67         char* inbuf;                    // Buffer OpenSSL reads into.
  68         std::string outbuf;     // Buffer for outgoing data that OpenSSL will not take.
  69         int fd;
  70
  71         issl_session()
  72         {
  73                 rstat = ISSL_READ;
  74                 wstat = ISSL_WRITE;
  75         }
  76 };
  77
  78 static int OnVerify(int preverify_ok, X509_STORE_CTX *ctx)
  79 {
  80         /* XXX: This will allow self signed certificates.
  81          * In the future if we want an option to not allow this,
  82          * we can just return preverify_ok here, and openssl
  83          * will boot off self-signed and invalid peer certs.
  84          */
  85         int ve = X509_STORE_CTX_get_error(ctx);
  86
  87         SelfSigned = (ve == X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT);
  88
  89         return 1;
  90 }
  91
  92 class ModuleSSLOpenSSL : public Module
  93 {
  94
  95         ConfigReader* Conf;
  96
  97         CullList* culllist;
  98
  99         std::vector<int> listenports;
 100
 101         int inbufsize;
 102         issl_session sessions[MAX_DESCRIPTORS];
 103
 104         SSL_CTX* ctx;
 105
 106         char* dummy;
 107
 108         std::string keyfile;
 109         std::string certfile;
 110         std::string cafile;
 111         // std::string crlfile;
 112         std::string dhfile;
 113
 114  public:
 115
 116         ModuleSSLOpenSSL(InspIRCd* Me)
 117                 : Module::Module(Me)
 118         {
 119                 culllist = new CullList(ServerInstance);
 120
 121                 ServerInstance->PublishInterface("InspSocketHook", this);
 122
 123                 // Not rehashable...because I cba to reduce all the sizes of existing buffers.
 124                 inbufsize = ServerInstance->Config->NetBufferSize;
 125
 126                 /* Global SSL library initialization*/
 127                 SSL_library_init();
 128                 SSL_load_error_strings();
 129
 130                 /* Build our SSL context*/
 131                 ctx = SSL_CTX_new( SSLv23_server_method() );
 132
 133                 SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER | SSL_VERIFY_CLIENT_ONCE, OnVerify);
 134
 135                 // Needs the flag as it ignores a plain /rehash
 136                 OnRehash("ssl");
 137         }
 138
 139         virtual void OnRehash(const std::string &param)
 140         {
 141                 if (param != "ssl")
 142                         return;
 143
 144                 Conf = new ConfigReader(ServerInstance);
 145
 146                 for (unsigned int i = 0; i < listenports.size(); i++)
 147                 {
 148                         ServerInstance->Config->DelIOHook(listenports[i]);
 149                 }
 150
 151                 listenports.clear();
 152
 153                 for (int i = 0; i < Conf->Enumerate("bind"); i++)
 154                 {
 155                         // For each <bind> tag
 156                         if (((Conf->ReadValue("bind", "type", i) == "") || (Conf->ReadValue("bind", "type", i) == "clients")) && (Conf->ReadValue("bind", "ssl", i) == "openssl"))
 157                         {
 158                                 // Get the port we're meant to be listening on with SSL
 159                                 std::string port = Conf->ReadValue("bind", "port", i);
 160                                 irc::portparser portrange(port, false);
 161                                 long portno = -1;
 162                                 while ((portno = portrange.GetToken()))
 163                                 {
 164                                         if (ServerInstance->Config->AddIOHook(portno, this))
 165                                         {
 166                                                 listenports.push_back(portno);
 167                                                 for (unsigned int i = 0; i < ServerInstance->stats->BoundPortCount; i++)
 168                                                         if (ServerInstance->Config->ports[i] == portno)
 169                                                                 ServerInstance->Config->openSockfd[i]->SetDescription("ssl");
 170                                                 ServerInstance->Log(DEFAULT, "m_ssl_openssl.so: Enabling SSL for port %d", portno);
 171                                         }
 172                                         else
 173                                         {
 174                                                 ServerInstance->Log(DEFAULT, "m_ssl_openssl.so: FAILED to enable SSL on port %d, maybe you have another ssl or similar module loaded?", portno);
 175                                         }
 176                                 }
 177                         }
 178                 }
 179
 180                 std::string confdir(CONFIG_FILE);
 181                 // +1 so we the path ends with a /
 182                 confdir = confdir.substr(0, confdir.find_last_of('/') + 1);
 183
 184                 cafile   = Conf->ReadValue("openssl", "cafile", 0);
 185                 certfile = Conf->ReadValue("openssl", "certfile", 0);
 186                 keyfile  = Conf->ReadValue("openssl", "keyfile", 0);
 187                 dhfile   = Conf->ReadValue("openssl", "dhfile", 0);
 188
 189                 // Set all the default values needed.
 190                 if (cafile == "")
 191                         cafile = "ca.pem";
 192
 193                 if (certfile == "")
 194                         certfile = "cert.pem";
 195
 196                 if (keyfile == "")
 197                         keyfile = "key.pem";
 198
 199                 if (dhfile == "")
 200                         dhfile = "dhparams.pem";
 201
 202                 // Prepend relative paths with the path to the config directory.
 203                 if (cafile[0] != '/')
 204                         cafile = confdir + cafile;
 205
 206                 //if(crlfile[0] != '/')
 207                 //      crlfile = confdir + crlfile;
 208
 209                 if (certfile[0] != '/')
 210                         certfile = confdir + certfile;
 211
 212                 if (keyfile[0] != '/')
 213                         keyfile = confdir + keyfile;
 214
 215                 if (dhfile[0] != '/')
 216                         dhfile = confdir + dhfile;
 217
 218                 /* Load our keys and certificates*/
 219                 if (!SSL_CTX_use_certificate_chain_file(ctx, certfile.c_str()))
 220                 {
 221                         ServerInstance->Log(DEFAULT, "m_ssl_openssl.so: Can't read certificate file %s", certfile.c_str());
 222                 }
 223
 224                 if (!SSL_CTX_use_PrivateKey_file(ctx, keyfile.c_str(), SSL_FILETYPE_PEM))
 225                 {
 226                         ServerInstance->Log(DEFAULT, "m_ssl_openssl.so: Can't read key file %s", keyfile.c_str());
 227                 }
 228
 229                 /* Load the CAs we trust*/
 230                 if (!SSL_CTX_load_verify_locations(ctx, cafile.c_str(), 0))
 231                 {
 232                         ServerInstance->Log(DEFAULT, "m_ssl_openssl.so: Can't read CA list from ", cafile.c_str());
 233                 }
 234
 235                 FILE* dhpfile = fopen(dhfile.c_str(), "r");
 236                 DH* ret;
 237
 238                 if (dhpfile == NULL)
 239                 {
 240                         ServerInstance->Log(DEFAULT, "m_ssl_openssl.so Couldn't open DH file %s: %s", dhfile.c_str(), strerror(errno));
 241                         throw ModuleException("Couldn't open DH file " + dhfile + ": " + strerror(errno));
 242                 }
 243                 else
 244                 {
 245                         ret = PEM_read_DHparams(dhpfile, NULL, NULL, NULL);
 246
 247                         if(SSL_CTX_set_tmp_dh(ctx, ret) < 0)
 248                         {
 249                                 ServerInstance->Log(DEFAULT, "m_ssl_openssl.so: Couldn't set DH parameters");
 250                         }
 251                 }
 252
 253                 fclose(dhpfile);
 254
 255                 DELETE(Conf);
 256         }
 257
 258         virtual ~ModuleSSLOpenSSL()
 259         {
 260                 SSL_CTX_free(ctx);
 261                 delete culllist;
 262         }
 263
 264         virtual void OnCleanup(int target_type, void* item)
 265         {
 266                 if (target_type == TYPE_USER)
 267                 {
 268                         userrec* user = (userrec*)item;
 269
 270                         if (user->GetExt("ssl", dummy) && IS_LOCAL(user) && isin(user->GetPort(), listenports))
 271                         {
 272                                 // User is using SSL, they're a local user, and they're using one of *our* SSL ports.
 273                                 // Potentially there could be multiple SSL modules loaded at once on different ports.
 274                                 ServerInstance->Log(DEBUG, "m_ssl_openssl.so: Adding user %s to cull list", user->nick);
 275                                 culllist->AddItem(user, "SSL module unloading");
 276                         }
 277                         if (user->GetExt("ssl_cert", dummy) && isin(user->GetPort(), listenports))
 278                         {
 279                                 ssl_cert* tofree;
 280                                 user->GetExt("ssl_cert", tofree);
 281                                 delete tofree;
 282                                 user->Shrink("ssl_cert");
 283                         }
 284                 }
 285         }
 286
 287         virtual void OnUnloadModule(Module* mod, const std::string &name)
 288         {
 289                 if (mod == this)
 290                 {
 291                         // We're being unloaded, kill all the users added to the cull list in OnCleanup
 292                         int numusers = culllist->Apply();
 293                         ServerInstance->Log(DEBUG, "m_ssl_openssl.so: Killed %d users for unload of OpenSSL SSL module", numusers);
 294
 295                         for(unsigned int i = 0; i < listenports.size(); i++)
 296                         {
 297                                 ServerInstance->Config->DelIOHook(listenports[i]);
 298                                 for (unsigned int j = 0; j < ServerInstance->stats->BoundPortCount; j++)
 299                                         if (ServerInstance->Config->ports[j] == listenports[i])
 300                                                 ServerInstance->Config->openSockfd[j]->SetDescription("plaintext");
 301                         }
 302                 }
 303         }
 304
 305         virtual Version GetVersion()
 306         {
 307                 return Version(1, 1, 0, 0, VF_VENDOR, API_VERSION);
 308         }
 309
 310         void Implements(char* List)
 311         {
 312                 List[I_OnRawSocketConnect] = List[I_OnRawSocketAccept] = List[I_OnRawSocketClose] = List[I_OnRawSocketRead] = List[I_OnRawSocketWrite] = List[I_OnCleanup] = 1;
 313                 List[I_OnRequest] = List[I_OnSyncUserMetaData] = List[I_OnDecodeMetaData] = List[I_OnUnloadModule] = List[I_OnRehash] = List[I_OnWhois] = List[I_OnPostConnect] = 1;
 314         }
 315
 316         virtual char* OnRequest(Request* request)
 317         {
 318                 ISHRequest* ISR = (ISHRequest*)request;
 319                 ServerInstance->Log(DEBUG, "hook OnRequest");
 320                 if (strcmp("IS_NAME", request->GetId()) == 0)
 321                 {
 322                         return "openssl";
 323                 }
 324                 else if (strcmp("IS_HOOK", request->GetId()) == 0)
 325                 {
 326                         char* ret = "OK";
 327                         try
 328                         {
 329                                 ret = ServerInstance->Config->AddIOHook((Module*)this, (InspSocket*)ISR->Sock) ? (char*)"OK" : NULL;
 330                         }
 331                         catch (ModuleException &e)
 332                         {
 333                                 return NULL;
 334                         }
 335
 336                         return ret;
 337                 }
 338                 else if (strcmp("IS_UNHOOK", request->GetId()) == 0)
 339                 {
 340                         ServerInstance->Log(DEBUG, "Unhooking socket %08x", ISR->Sock);
 341                         return ServerInstance->Config->DelIOHook((InspSocket*)ISR->Sock) ? (char*)"OK" : NULL;
 342                 }
 343                 else if (strcmp("IS_HSDONE", request->GetId()) == 0)
 344                 {
 345                         issl_session* session = &sessions[ISR->Sock->GetFd()];
 346                         return (session->status == ISSL_HANDSHAKING) ? NULL : (char*)"OK";
 347                 }
 348                 else if (strcmp("IS_ATTACH", request->GetId()) == 0)
 349                 {
 350                         issl_session* session = &sessions[ISR->Sock->GetFd()];
 351                         if (session)
 352                         {
 353                                 VerifyCertificate(session, (InspSocket*)ISR->Sock);
 354                                 return "OK";
 355                         }
 356                 }
 357                 return NULL;
 358         }
 359
 360
 361         virtual void OnRawSocketAccept(int fd, const std::string &ip, int localport)
 362         {
 363                 ServerInstance->Log(DEBUG, "Hook accept %d", fd);
 364                 issl_session* session = &sessions[fd];
 365
 366                 session->fd = fd;
 367                 session->inbuf = new char[inbufsize];
 368                 session->inbufoffset = 0;
 369                 session->sess = SSL_new(ctx);
 370                 session->status = ISSL_NONE;
 371
 372                 if (session->sess == NULL)
 373                 {
 374                         ServerInstance->Log(DEBUG, "m_ssl.so: Couldn't create SSL object: %s", get_error());
 375                         return;
 376                 }
 377
 378                 if (SSL_set_fd(session->sess, fd) == 0)
 379                 {
 380                         ServerInstance->Log(DEBUG, "m_ssl.so: Couldn't set fd for SSL object: %s", get_error());
 381                         return;
 382                 }
 383
 384                 Handshake(session);
 385         }
 386
 387         virtual void OnRawSocketConnect(int fd)
 388         {
 389                 issl_session* session = &sessions[fd];
 390
 391                 session->fd = fd;
 392                 session->inbuf = new char[inbufsize];
 393                 session->inbufoffset = 0;
 394                 session->sess = SSL_new(ctx);
 395                 session->status = ISSL_NONE;
 396
 397                 if (session->sess == NULL)
 398                 {
 399                         ServerInstance->Log(DEBUG, "m_ssl.so: Couldn't create SSL object: %s", get_error());
 400                         return;
 401                 }
 402
 403                 if (SSL_set_fd(session->sess, fd) == 0)
 404                 {
 405                         ServerInstance->Log(DEBUG, "m_ssl.so: Couldn't set fd for SSL object: %s", get_error());
 406                         return;
 407                 }
 408
 409                 Handshake(session);
 410         }
 411
 412         virtual void OnRawSocketClose(int fd)
 413         {
 414                 ServerInstance->Log(DEBUG, "m_ssl_openssl.so: OnRawSocketClose: %d", fd);
 415                 CloseSession(&sessions[fd]);
 416
 417                 EventHandler* user = ServerInstance->SE->GetRef(fd);
 418
 419                 if ((user) && (user->GetExt("ssl_cert", dummy)))
 420                 {
 421                         ssl_cert* tofree;
 422                         user->GetExt("ssl_cert", tofree);
 423                         delete tofree;
 424                         user->Shrink("ssl_cert");
 425                 }
 426         }
 427
 428         virtual int OnRawSocketRead(int fd, char* buffer, unsigned int count, int &readresult)
 429         {
 430                 issl_session* session = &sessions[fd];
 431
 432                 if (!session->sess)
 433                 {
 434                         ServerInstance->Log(DEBUG, "m_ssl_openssl.so: OnRawSocketRead: No session to read from");
 435                         readresult = 0;
 436                         CloseSession(session);
 437                         return 1;
 438                 }
 439
 440                 if (session->status == ISSL_HANDSHAKING)
 441                 {
 442                         if (session->rstat == ISSL_READ || session->wstat == ISSL_READ)
 443                         {
 444                                 // The handshake isn't finished and it wants to read, try to finish it.
 445                                 if (Handshake(session))
 446                                 {
 447                                         // Handshake successfully resumed.
 448                                         ServerInstance->Log(DEBUG, "m_ssl_openssl.so: OnRawSocketRead: successfully resumed handshake");
 449                                 }
 450                                 else
 451                                 {
 452                                         // Couldn't resume handshake.
 453                                         ServerInstance->Log(DEBUG, "m_ssl_openssl.so: OnRawSocketRead: failed to resume handshake");
 454                                         return -1;
 455                                 }
 456                         }
 457                         else
 458                         {
 459                                 ServerInstance->Log(DEBUG, "m_ssl_openssl.so: OnRawSocketRead: handshake wants to write data but we are currently reading");
 460                                 return -1;
 461                         }
 462                 }
 463
 464                 // If we resumed the handshake then session->status will be ISSL_OPEN
 465
 466                 if (session->status == ISSL_OPEN)
 467                 {
 468                         if (session->wstat == ISSL_READ)
 469                         {
 470                                 if(DoWrite(session) == 0)
 471                                         return 0;
 472                         }
 473
 474                         if (session->rstat == ISSL_READ)
 475                         {
 476                                 int ret = DoRead(session);
 477
 478                                 if (ret > 0)
 479                                 {
 480                                         if (count <= session->inbufoffset)
 481                                         {
 482                                                 memcpy(buffer, session->inbuf, count);
 483                                                 // Move the stuff left in inbuf to the beginning of it
 484                                                 memcpy(session->inbuf, session->inbuf + count, (session->inbufoffset - count));
 485                                                 // Now we need to set session->inbufoffset to the amount of data still waiting to be handed to insp.
 486                                                 session->inbufoffset -= count;
 487                                                 // Insp uses readresult as the count of how much data there is in buffer, so:
 488                                                 readresult = count;
 489                                         }
 490                                         else
 491                                         {
 492                                                 // There's not as much in the inbuf as there is space in the buffer, so just copy the whole thing.
 493                                                 memcpy(buffer, session->inbuf, session->inbufoffset);
 494
 495                                                 readresult = session->inbufoffset;
 496                                                 // Zero the offset, as there's nothing there..
 497                                                 session->inbufoffset = 0;
 498                                         }
 499
 500                                         return 1;
 501                                 }
 502                                 else
 503                                 {
 504                                         return ret;
 505                                 }
 506                         }
 507                 }
 508
 509                 return -1;
 510         }
 511
 512         virtual int OnRawSocketWrite(int fd, const char* buffer, int count)
 513         {
 514                 issl_session* session = &sessions[fd];
 515
 516                 if (!session->sess)
 517                 {
 518                         ServerInstance->Log(DEBUG, "m_ssl_openssl.so: OnRawSocketWrite: No session to write to");
 519                         CloseSession(session);
 520                         return 1;
 521                 }
 522
 523                 session->outbuf.append(buffer, count);
 524
 525                 if (session->status == ISSL_HANDSHAKING)
 526                 {
 527                         // The handshake isn't finished, try to finish it.
 528                         if (session->rstat == ISSL_WRITE || session->wstat == ISSL_WRITE)
 529                         {
 530                                 if (Handshake(session))
 531                                 {
 532                                         // Handshake successfully resumed.
 533                                         ServerInstance->Log(DEBUG, "m_ssl_openssl.so: OnRawSocketWrite: successfully resumed handshake");
 534                                 }
 535                                 else
 536                                 {
 537                                         // Couldn't resume handshake.
 538                                         ServerInstance->Log(DEBUG, "m_ssl_openssl.so: OnRawSocketWrite: failed to resume handshake");
 539                                 }
 540                         }
 541                         else
 542                         {
 543                                 ServerInstance->Log(DEBUG, "m_ssl_openssl.so: OnRawSocketWrite: handshake wants to read data but we are currently writing");
 544                         }
 545                 }
 546
 547                 if (session->status == ISSL_OPEN)
 548                 {
 549                         if (session->rstat == ISSL_WRITE)
 550                         {
 551                                 DoRead(session);
 552                         }
 553
 554                         if (session->wstat == ISSL_WRITE)
 555                         {
 556                                 return DoWrite(session);
 557                         }
 558                 }
 559
 560                 return 1;
 561         }
 562
 563         int DoWrite(issl_session* session)
 564         {
 565                 if (!session->outbuf.size())
 566                         return -1;
 567
 568                 ServerInstance->Log(DEBUG, "m_ssl_openssl.so: To write: %d", session->outbuf.size());
 569                 int ret = SSL_write(session->sess, session->outbuf.data(), session->outbuf.size());
 570
 571                 if (ret == 0)
 572                 {
 573                         ServerInstance->Log(DEBUG, "m_ssl_openssl.so: DoWrite: Client closed the connection");
 574                         CloseSession(session);
 575                         return 0;
 576                 }
 577                 else if (ret < 0)
 578                 {
 579                         int err = SSL_get_error(session->sess, ret);
 580
 581                         if (err == SSL_ERROR_WANT_WRITE)
 582                         {
 583                                 ServerInstance->Log(DEBUG, "m_ssl_openssl.so: DoWrite: Not all SSL data written, need to retry: %s", get_error());
 584                                 session->wstat = ISSL_WRITE;
 585                                 return -1;
 586                         }
 587                         else if (err == SSL_ERROR_WANT_READ)
 588                         {
 589                                 ServerInstance->Log(DEBUG, "m_ssl_openssl.so: DoWrite: Not all SSL data written but the damn thing wants to read instead: %s", get_error());
 590                                 session->wstat = ISSL_READ;
 591                                 return -1;
 592                         }
 593                         else
 594                         {
 595                                 ServerInstance->Log(DEBUG, "m_ssl_openssl.so: DoWrite: Error writing SSL data: %s", get_error());
 596                                 CloseSession(session);
 597                                 return 0;
 598                         }
 599                 }
 600                 else
 601                 {
 602                         session->outbuf = session->outbuf.substr(ret);
 603                         return ret;
 604                 }
 605         }
 606
 607         int DoRead(issl_session* session)
 608         {
 609                 // Is this right? Not sure if the unencrypted data is garaunteed to be the same length.
 610                 // Read into the inbuffer, offset from the beginning by the amount of data we have that insp hasn't taken yet.
 611
 612                 int ret = SSL_read(session->sess, session->inbuf + session->inbufoffset, inbufsize - session->inbufoffset);
 613
 614                 if (ret == 0)
 615                 {
 616                         // Client closed connection.
 617                         ServerInstance->Log(DEBUG, "m_ssl_openssl.so: DoRead: Client closed the connection");
 618                         CloseSession(session);
 619                         return 0;
 620                 }
 621                 else if (ret < 0)
 622                 {
 623                         int err = SSL_get_error(session->sess, ret);
 624
 625                         if (err == SSL_ERROR_WANT_READ)
 626                         {
 627                                 ServerInstance->Log(DEBUG, "m_ssl_openssl.so: DoRead: Not all SSL data read, need to retry: %s", get_error());
 628                                 session->rstat = ISSL_READ;
 629                                 return -1;
 630                         }
 631                         else if (err == SSL_ERROR_WANT_WRITE)
 632                         {
 633                                 ServerInstance->Log(DEBUG, "m_ssl_openssl.so: DoRead: Not all SSL data read but the damn thing wants to write instead: %s", get_error());
 634                                 session->rstat = ISSL_WRITE;
 635                                 return -1;
 636                         }
 637                         else
 638                         {
 639                                 ServerInstance->Log(DEBUG, "m_ssl_openssl.so: DoRead: Error reading SSL data: %s", get_error());
 640                                 CloseSession(session);
 641                                 return 0;
 642                         }
 643                 }
 644                 else
 645                 {
 646                         // Read successfully 'ret' bytes into inbuf + inbufoffset
 647                         // There are 'ret' + 'inbufoffset' bytes of data in 'inbuf'
 648                         // 'buffer' is 'count' long
 649
 650                         session->inbufoffset += ret;
 651
 652                         return ret;
 653                 }
 654         }
 655
 656         // :kenny.chatspike.net 320 Om Epy|AFK :is a Secure Connection
 657         virtual void OnWhois(userrec* source, userrec* dest)
 658         {
 659                 // Bugfix, only send this numeric for *our* SSL users
 660                 if (dest->GetExt("ssl", dummy) || (IS_LOCAL(dest) &&  isin(dest->GetPort(), listenports)))
 661                 {
 662                         ServerInstance->SendWhoisLine(source, dest, 320, "%s %s :is using a secure connection", source->nick, dest->nick);
 663                 }
 664         }
 665
 666         virtual void OnSyncUserMetaData(userrec* user, Module* proto, void* opaque, const std::string &extname)
 667         {
 668                 // check if the linking module wants to know about OUR metadata
 669                 if (extname == "ssl")
 670                 {
 671                         // check if this user has an swhois field to send
 672                         if(user->GetExt(extname, dummy))
 673                         {
 674                                 // call this function in the linking module, let it format the data how it
 675                                 // sees fit, and send it on its way. We dont need or want to know how.
 676                                 proto->ProtoSendMetaData(opaque, TYPE_USER, user, extname, "ON");
 677                         }
 678                 }
 679         }
 680
 681         virtual void OnDecodeMetaData(int target_type, void* target, const std::string &extname, const std::string &extdata)
 682         {
 683                 // check if its our metadata key, and its associated with a user
 684                 if ((target_type == TYPE_USER) && (extname == "ssl"))
 685                 {
 686                         userrec* dest = (userrec*)target;
 687                         // if they dont already have an ssl flag, accept the remote server's
 688                         if (!dest->GetExt(extname, dummy))
 689                         {
 690                                 dest->Extend(extname, "ON");
 691                         }
 692                 }
 693         }
 694
 695         bool Handshake(issl_session* session)
 696         {
 697                 int ret = SSL_accept(session->sess);
 698
 699                 if (ret < 0)
 700                 {
 701                         int err = SSL_get_error(session->sess, ret);
 702
 703                         if (err == SSL_ERROR_WANT_READ)
 704                         {
 705                                 ServerInstance->Log(DEBUG, "m_ssl_openssl.so: Handshake: Not completed, need to read again: %s", get_error());
 706                                 session->rstat = ISSL_READ;
 707                                 session->status = ISSL_HANDSHAKING;
 708                         }
 709                         else if (err == SSL_ERROR_WANT_WRITE)
 710                         {
 711                                 ServerInstance->Log(DEBUG, "m_ssl_openssl.so: Handshake: Not completed, need to write more data: %s", get_error());
 712                                 session->wstat = ISSL_WRITE;
 713                                 session->status = ISSL_HANDSHAKING;
 714                                 MakePollWrite(session);
 715                         }
 716                         else
 717                         {
 718                                 ServerInstance->Log(DEBUG, "m_ssl_openssl.so: Handshake: Failed, bailing: %s", get_error());
 719                                 CloseSession(session);
 720                         }
 721
 722                         return false;
 723                 }
 724                 else
 725                 {
 726                         // Handshake complete.
 727                         ServerInstance->Log(DEBUG, "m_ssl_openssl.so: Handshake completed");
 728
 729                         // This will do for setting the ssl flag...it could be done earlier if it's needed. But this seems neater.
 730                         userrec* u = ServerInstance->FindDescriptor(session->fd);
 731                         if (u)
 732                         {
 733                                 if (!u->GetExt("ssl", dummy))
 734                                         u->Extend("ssl", "ON");
 735                         }
 736
 737                         session->status = ISSL_OPEN;
 738
 739                         MakePollWrite(session);
 740
 741                         return true;
 742                 }
 743         }
 744
 745         virtual void OnPostConnect(userrec* user)
 746         {
 747                 // This occurs AFTER OnUserConnect so we can be sure the
 748                 // protocol module has propogated the NICK message.
 749                 if ((user->GetExt("ssl", dummy)) && (IS_LOCAL(user)))
 750                 {
 751                         // Tell whatever protocol module we're using that we need to inform other servers of this metadata NOW.
 752                         std::deque<std::string>* metadata = new std::deque<std::string>;
 753                         metadata->push_back(user->nick);
 754                         metadata->push_back("ssl");             // The metadata id
 755                         metadata->push_back("ON");              // The value to send
 756                         Event* event = new Event((char*)metadata,(Module*)this,"send_metadata");
 757                         event->Send(ServerInstance);            // Trigger the event. We don't care what module picks it up.
 758                         DELETE(event);
 759                         DELETE(metadata);
 760
 761                         VerifyCertificate(&sessions[user->GetFd()], user);
 762                 }
 763         }
 764
 765         void MakePollWrite(issl_session* session)
 766         {
 767                 OnRawSocketWrite(session->fd, NULL, 0);
 768         }
 769
 770         void CloseSession(issl_session* session)
 771         {
 772                 if (session->sess)
 773                 {
 774                         SSL_shutdown(session->sess);
 775                         SSL_free(session->sess);
 776                 }
 777
 778                 if (session->inbuf)
 779                 {
 780                         delete[] session->inbuf;
 781                 }
 782
 783                 session->outbuf.clear();
 784                 session->inbuf = NULL;
 785                 session->sess = NULL;
 786                 session->status = ISSL_NONE;
 787         }
 788
 789         void VerifyCertificate(issl_session* session, Extensible* user)
 790         {
 791                 X509* cert;
 792                 ssl_cert* certinfo = new ssl_cert;
 793                 unsigned int n;
 794                 unsigned char md[EVP_MAX_MD_SIZE];
 795                 const EVP_MD *digest = EVP_md5();
 796
 797                 user->Extend("ssl_cert",certinfo);
 798
 799                 cert = SSL_get_peer_certificate((SSL*)session->sess);
 800
 801                 if (!cert)
 802                 {
 803                         certinfo->data.insert(std::make_pair("error","Could not get peer certificate: "+std::string(get_error())));
 804                         return;
 805                 }
 806
 807                 certinfo->data.insert(std::make_pair("invalid", SSL_get_verify_result(session->sess) != X509_V_OK ? ConvToStr(1) : ConvToStr(0)));
 808
 809                 if (SelfSigned)
 810                 {
 811                         certinfo->data.insert(std::make_pair("unknownsigner",ConvToStr(0)));
 812                         certinfo->data.insert(std::make_pair("trusted",ConvToStr(1)));
 813                 }
 814                 else
 815                 {
 816                         certinfo->data.insert(std::make_pair("unknownsigner",ConvToStr(1)));
 817                         certinfo->data.insert(std::make_pair("trusted",ConvToStr(0)));
 818                 }
 819
 820                 certinfo->data.insert(std::make_pair("dn",std::string(X509_NAME_oneline(X509_get_subject_name(cert),0,0))));
 821                 certinfo->data.insert(std::make_pair("issuer",std::string(X509_NAME_oneline(X509_get_issuer_name(cert),0,0))));
 822
 823                 if (!X509_digest(cert, digest, md, &n))
 824                 {
 825                         certinfo->data.insert(std::make_pair("error","Out of memory generating fingerprint"));
 826                 }
 827                 else
 828                 {
 829                         certinfo->data.insert(std::make_pair("fingerprint",irc::hex(md, n)));
 830                 }
 831
 832                 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))
 833                 {
 834                         certinfo->data.insert(std::make_pair("error","Not activated, or expired certificate"));
 835                 }
 836
 837                 X509_free(cert);
 838         }
 839 };
 840
 841 class ModuleSSLOpenSSLFactory : public ModuleFactory
 842 {
 843  public:
 844         ModuleSSLOpenSSLFactory()
 845         {
 846         }
 847
 848         ~ModuleSSLOpenSSLFactory()
 849         {
 850         }
 851
 852         virtual Module * CreateModule(InspIRCd* Me)
 853         {
 854                 return new ModuleSSLOpenSSL(Me);
 855         }
 856 };
 857
 858
 859 extern "C" void * init_module( void )
 860 {
 861         return new ModuleSSLOpenSSLFactory;
 862 }