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(NULL,"ssl");
 137         }
 138
 139         virtual void OnRehash(userrec* user, 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                                                 if (ServerInstance->Config->openSockfd[j])
 301                                                         ServerInstance->Config->openSockfd[j]->SetDescription("plaintext");
 302                         }
 303                 }
 304         }
 305
 306         virtual Version GetVersion()
 307         {
 308                 return Version(1, 1, 0, 0, VF_VENDOR, API_VERSION);
 309         }
 310
 311         void Implements(char* List)
 312         {
 313                 List[I_OnRawSocketConnect] = List[I_OnRawSocketAccept] = List[I_OnRawSocketClose] = List[I_OnRawSocketRead] = List[I_OnRawSocketWrite] = List[I_OnCleanup] = 1;
 314                 List[I_OnRequest] = List[I_OnSyncUserMetaData] = List[I_OnDecodeMetaData] = List[I_OnUnloadModule] = List[I_OnRehash] = List[I_OnWhois] = List[I_OnPostConnect] = 1;
 315         }
 316
 317         virtual char* OnRequest(Request* request)
 318         {
 319                 ISHRequest* ISR = (ISHRequest*)request;
 320                 ServerInstance->Log(DEBUG, "hook OnRequest");
 321                 if (strcmp("IS_NAME", request->GetId()) == 0)
 322                 {
 323                         return "openssl";
 324                 }
 325                 else if (strcmp("IS_HOOK", request->GetId()) == 0)
 326                 {
 327                         char* ret = "OK";
 328                         try
 329                         {
 330                                 ret = ServerInstance->Config->AddIOHook((Module*)this, (InspSocket*)ISR->Sock) ? (char*)"OK" : NULL;
 331                         }
 332                         catch (ModuleException &e)
 333                         {
 334                                 return NULL;
 335                         }
 336
 337                         return ret;
 338                 }
 339                 else if (strcmp("IS_UNHOOK", request->GetId()) == 0)
 340                 {
 341                         ServerInstance->Log(DEBUG, "Unhooking socket %08x", ISR->Sock);
 342                         return ServerInstance->Config->DelIOHook((InspSocket*)ISR->Sock) ? (char*)"OK" : NULL;
 343                 }
 344                 else if (strcmp("IS_HSDONE", request->GetId()) == 0)
 345                 {
 346                         issl_session* session = &sessions[ISR->Sock->GetFd()];
 347                         return (session->status == ISSL_HANDSHAKING) ? NULL : (char*)"OK";
 348                 }
 349                 else if (strcmp("IS_ATTACH", request->GetId()) == 0)
 350                 {
 351                         issl_session* session = &sessions[ISR->Sock->GetFd()];
 352                         if (session)
 353                         {
 354                                 VerifyCertificate(session, (InspSocket*)ISR->Sock);
 355                                 return "OK";
 356                         }
 357                 }
 358                 return NULL;
 359         }
 360
 361
 362         virtual void OnRawSocketAccept(int fd, const std::string &ip, int localport)
 363         {
 364                 ServerInstance->Log(DEBUG, "Hook accept %d", fd);
 365                 issl_session* session = &sessions[fd];
 366
 367                 session->fd = fd;
 368                 session->inbuf = new char[inbufsize];
 369                 session->inbufoffset = 0;
 370                 session->sess = SSL_new(ctx);
 371                 session->status = ISSL_NONE;
 372
 373                 if (session->sess == NULL)
 374                 {
 375                         ServerInstance->Log(DEBUG, "m_ssl.so: Couldn't create SSL object: %s", get_error());
 376                         return;
 377                 }
 378
 379                 if (SSL_set_fd(session->sess, fd) == 0)
 380                 {
 381                         ServerInstance->Log(DEBUG, "m_ssl.so: Couldn't set fd for SSL object: %s", get_error());
 382                         return;
 383                 }
 384
 385                 Handshake(session);
 386         }
 387
 388         virtual void OnRawSocketConnect(int fd)
 389         {
 390                 issl_session* session = &sessions[fd];
 391
 392                 session->fd = fd;
 393                 session->inbuf = new char[inbufsize];
 394                 session->inbufoffset = 0;
 395                 session->sess = SSL_new(ctx);
 396                 session->status = ISSL_NONE;
 397
 398                 if (session->sess == NULL)
 399                 {
 400                         ServerInstance->Log(DEBUG, "m_ssl.so: Couldn't create SSL object: %s", get_error());
 401                         return;
 402                 }
 403
 404                 if (SSL_set_fd(session->sess, fd) == 0)
 405                 {
 406                         ServerInstance->Log(DEBUG, "m_ssl.so: Couldn't set fd for SSL object: %s", get_error());
 407                         return;
 408                 }
 409
 410                 Handshake(session);
 411         }
 412
 413         virtual void OnRawSocketClose(int fd)
 414         {
 415                 ServerInstance->Log(DEBUG, "m_ssl_openssl.so: OnRawSocketClose: %d", fd);
 416                 CloseSession(&sessions[fd]);
 417
 418                 EventHandler* user = ServerInstance->SE->GetRef(fd);
 419
 420                 if ((user) && (user->GetExt("ssl_cert", dummy)))
 421                 {
 422                         ssl_cert* tofree;
 423                         user->GetExt("ssl_cert", tofree);
 424                         delete tofree;
 425                         user->Shrink("ssl_cert");
 426                 }
 427         }
 428
 429         virtual int OnRawSocketRead(int fd, char* buffer, unsigned int count, int &readresult)
 430         {
 431                 issl_session* session = &sessions[fd];
 432
 433                 if (!session->sess)
 434                 {
 435                         ServerInstance->Log(DEBUG, "m_ssl_openssl.so: OnRawSocketRead: No session to read from");
 436                         readresult = 0;
 437                         CloseSession(session);
 438                         return 1;
 439                 }
 440
 441                 if (session->status == ISSL_HANDSHAKING)
 442                 {
 443                         if (session->rstat == ISSL_READ || session->wstat == ISSL_READ)
 444                         {
 445                                 // The handshake isn't finished and it wants to read, try to finish it.
 446                                 if (Handshake(session))
 447                                 {
 448                                         // Handshake successfully resumed.
 449                                         ServerInstance->Log(DEBUG, "m_ssl_openssl.so: OnRawSocketRead: successfully resumed handshake");
 450                                 }
 451                                 else
 452                                 {
 453                                         // Couldn't resume handshake.
 454                                         ServerInstance->Log(DEBUG, "m_ssl_openssl.so: OnRawSocketRead: failed to resume handshake");
 455                                         return -1;
 456                                 }
 457                         }
 458                         else
 459                         {
 460                                 ServerInstance->Log(DEBUG, "m_ssl_openssl.so: OnRawSocketRead: handshake wants to write data but we are currently reading");
 461                                 return -1;
 462                         }
 463                 }
 464
 465                 // If we resumed the handshake then session->status will be ISSL_OPEN
 466
 467                 if (session->status == ISSL_OPEN)
 468                 {
 469                         if (session->wstat == ISSL_READ)
 470                         {
 471                                 if(DoWrite(session) == 0)
 472                                         return 0;
 473                         }
 474
 475                         if (session->rstat == ISSL_READ)
 476                         {
 477                                 int ret = DoRead(session);
 478
 479                                 if (ret > 0)
 480                                 {
 481                                         if (count <= session->inbufoffset)
 482                                         {
 483                                                 memcpy(buffer, session->inbuf, count);
 484                                                 // Move the stuff left in inbuf to the beginning of it
 485                                                 memcpy(session->inbuf, session->inbuf + count, (session->inbufoffset - count));
 486                                                 // Now we need to set session->inbufoffset to the amount of data still waiting to be handed to insp.
 487                                                 session->inbufoffset -= count;
 488                                                 // Insp uses readresult as the count of how much data there is in buffer, so:
 489                                                 readresult = count;
 490                                         }
 491                                         else
 492                                         {
 493                                                 // There's not as much in the inbuf as there is space in the buffer, so just copy the whole thing.
 494                                                 memcpy(buffer, session->inbuf, session->inbufoffset);
 495
 496                                                 readresult = session->inbufoffset;
 497                                                 // Zero the offset, as there's nothing there..
 498                                                 session->inbufoffset = 0;
 499                                         }
 500
 501                                         return 1;
 502                                 }
 503                                 else
 504                                 {
 505                                         return ret;
 506                                 }
 507                         }
 508                 }
 509
 510                 return -1;
 511         }
 512
 513         virtual int OnRawSocketWrite(int fd, const char* buffer, int count)
 514         {
 515                 issl_session* session = &sessions[fd];
 516
 517                 if (!session->sess)
 518                 {
 519                         ServerInstance->Log(DEBUG, "m_ssl_openssl.so: OnRawSocketWrite: No session to write to");
 520                         CloseSession(session);
 521                         return 1;
 522                 }
 523
 524                 session->outbuf.append(buffer, count);
 525
 526                 if (session->status == ISSL_HANDSHAKING)
 527                 {
 528                         // The handshake isn't finished, try to finish it.
 529                         if (session->rstat == ISSL_WRITE || session->wstat == ISSL_WRITE)
 530                         {
 531                                 if (Handshake(session))
 532                                 {
 533                                         // Handshake successfully resumed.
 534                                         ServerInstance->Log(DEBUG, "m_ssl_openssl.so: OnRawSocketWrite: successfully resumed handshake");
 535                                 }
 536                                 else
 537                                 {
 538                                         // Couldn't resume handshake.
 539                                         ServerInstance->Log(DEBUG, "m_ssl_openssl.so: OnRawSocketWrite: failed to resume handshake");
 540                                 }
 541                         }
 542                         else
 543                         {
 544                                 ServerInstance->Log(DEBUG, "m_ssl_openssl.so: OnRawSocketWrite: handshake wants to read data but we are currently writing");
 545                         }
 546                 }
 547
 548                 if (session->status == ISSL_OPEN)
 549                 {
 550                         if (session->rstat == ISSL_WRITE)
 551                         {
 552                                 DoRead(session);
 553                         }
 554
 555                         if (session->wstat == ISSL_WRITE)
 556                         {
 557                                 return DoWrite(session);
 558                         }
 559                 }
 560
 561                 return 1;
 562         }
 563
 564         int DoWrite(issl_session* session)
 565         {
 566                 if (!session->outbuf.size())
 567                         return -1;
 568
 569                 ServerInstance->Log(DEBUG, "m_ssl_openssl.so: To write: %d", session->outbuf.size());
 570                 int ret = SSL_write(session->sess, session->outbuf.data(), session->outbuf.size());
 571
 572                 if (ret == 0)
 573                 {
 574                         ServerInstance->Log(DEBUG, "m_ssl_openssl.so: DoWrite: Client closed the connection");
 575                         CloseSession(session);
 576                         return 0;
 577                 }
 578                 else if (ret < 0)
 579                 {
 580                         int err = SSL_get_error(session->sess, ret);
 581
 582                         if (err == SSL_ERROR_WANT_WRITE)
 583                         {
 584                                 ServerInstance->Log(DEBUG, "m_ssl_openssl.so: DoWrite: Not all SSL data written, need to retry: %s", get_error());
 585                                 session->wstat = ISSL_WRITE;
 586                                 return -1;
 587                         }
 588                         else if (err == SSL_ERROR_WANT_READ)
 589                         {
 590                                 ServerInstance->Log(DEBUG, "m_ssl_openssl.so: DoWrite: Not all SSL data written but the damn thing wants to read instead: %s", get_error());
 591                                 session->wstat = ISSL_READ;
 592                                 return -1;
 593                         }
 594                         else
 595                         {
 596                                 ServerInstance->Log(DEBUG, "m_ssl_openssl.so: DoWrite: Error writing SSL data: %s", get_error());
 597                                 CloseSession(session);
 598                                 return 0;
 599                         }
 600                 }
 601                 else
 602                 {
 603                         session->outbuf = session->outbuf.substr(ret);
 604                         return ret;
 605                 }
 606         }
 607
 608         int DoRead(issl_session* session)
 609         {
 610                 // Is this right? Not sure if the unencrypted data is garaunteed to be the same length.
 611                 // Read into the inbuffer, offset from the beginning by the amount of data we have that insp hasn't taken yet.
 612
 613                 int ret = SSL_read(session->sess, session->inbuf + session->inbufoffset, inbufsize - session->inbufoffset);
 614
 615                 if (ret == 0)
 616                 {
 617                         // Client closed connection.
 618                         ServerInstance->Log(DEBUG, "m_ssl_openssl.so: DoRead: Client closed the connection");
 619                         CloseSession(session);
 620                         return 0;
 621                 }
 622                 else if (ret < 0)
 623                 {
 624                         int err = SSL_get_error(session->sess, ret);
 625
 626                         if (err == SSL_ERROR_WANT_READ)
 627                         {
 628                                 ServerInstance->Log(DEBUG, "m_ssl_openssl.so: DoRead: Not all SSL data read, need to retry: %s", get_error());
 629                                 session->rstat = ISSL_READ;
 630                                 return -1;
 631                         }
 632                         else if (err == SSL_ERROR_WANT_WRITE)
 633                         {
 634                                 ServerInstance->Log(DEBUG, "m_ssl_openssl.so: DoRead: Not all SSL data read but the damn thing wants to write instead: %s", get_error());
 635                                 session->rstat = ISSL_WRITE;
 636                                 return -1;
 637                         }
 638                         else
 639                         {
 640                                 ServerInstance->Log(DEBUG, "m_ssl_openssl.so: DoRead: Error reading SSL data: %s", get_error());
 641                                 CloseSession(session);
 642                                 return 0;
 643                         }
 644                 }
 645                 else
 646                 {
 647                         // Read successfully 'ret' bytes into inbuf + inbufoffset
 648                         // There are 'ret' + 'inbufoffset' bytes of data in 'inbuf'
 649                         // 'buffer' is 'count' long
 650
 651                         session->inbufoffset += ret;
 652
 653                         return ret;
 654                 }
 655         }
 656
 657         // :kenny.chatspike.net 320 Om Epy|AFK :is a Secure Connection
 658         virtual void OnWhois(userrec* source, userrec* dest)
 659         {
 660                 // Bugfix, only send this numeric for *our* SSL users
 661                 if (dest->GetExt("ssl", dummy) || (IS_LOCAL(dest) &&  isin(dest->GetPort(), listenports)))
 662                 {
 663                         ServerInstance->SendWhoisLine(source, dest, 320, "%s %s :is using a secure connection", source->nick, dest->nick);
 664                 }
 665         }
 666
 667         virtual void OnSyncUserMetaData(userrec* user, Module* proto, void* opaque, const std::string &extname)
 668         {
 669                 // check if the linking module wants to know about OUR metadata
 670                 if (extname == "ssl")
 671                 {
 672                         // check if this user has an swhois field to send
 673                         if(user->GetExt(extname, dummy))
 674                         {
 675                                 // call this function in the linking module, let it format the data how it
 676                                 // sees fit, and send it on its way. We dont need or want to know how.
 677                                 proto->ProtoSendMetaData(opaque, TYPE_USER, user, extname, "ON");
 678                         }
 679                 }
 680         }
 681
 682         virtual void OnDecodeMetaData(int target_type, void* target, const std::string &extname, const std::string &extdata)
 683         {
 684                 // check if its our metadata key, and its associated with a user
 685                 if ((target_type == TYPE_USER) && (extname == "ssl"))
 686                 {
 687                         userrec* dest = (userrec*)target;
 688                         // if they dont already have an ssl flag, accept the remote server's
 689                         if (!dest->GetExt(extname, dummy))
 690                         {
 691                                 dest->Extend(extname, "ON");
 692                         }
 693                 }
 694         }
 695
 696         bool Handshake(issl_session* session)
 697         {
 698                 int ret = SSL_accept(session->sess);
 699
 700                 if (ret < 0)
 701                 {
 702                         int err = SSL_get_error(session->sess, ret);
 703
 704                         if (err == SSL_ERROR_WANT_READ)
 705                         {
 706                                 ServerInstance->Log(DEBUG, "m_ssl_openssl.so: Handshake: Not completed, need to read again: %s", get_error());
 707                                 session->rstat = ISSL_READ;
 708                                 session->status = ISSL_HANDSHAKING;
 709                         }
 710                         else if (err == SSL_ERROR_WANT_WRITE)
 711                         {
 712                                 ServerInstance->Log(DEBUG, "m_ssl_openssl.so: Handshake: Not completed, need to write more data: %s", get_error());
 713                                 session->wstat = ISSL_WRITE;
 714                                 session->status = ISSL_HANDSHAKING;
 715                                 MakePollWrite(session);
 716                         }
 717                         else
 718                         {
 719                                 ServerInstance->Log(DEBUG, "m_ssl_openssl.so: Handshake: Failed, bailing: %s", get_error());
 720                                 CloseSession(session);
 721                         }
 722
 723                         return false;
 724                 }
 725                 else
 726                 {
 727                         // Handshake complete.
 728                         ServerInstance->Log(DEBUG, "m_ssl_openssl.so: Handshake completed");
 729
 730                         // This will do for setting the ssl flag...it could be done earlier if it's needed. But this seems neater.
 731                         userrec* u = ServerInstance->FindDescriptor(session->fd);
 732                         if (u)
 733                         {
 734                                 if (!u->GetExt("ssl", dummy))
 735                                         u->Extend("ssl", "ON");
 736                         }
 737
 738                         session->status = ISSL_OPEN;
 739
 740                         MakePollWrite(session);
 741
 742                         return true;
 743                 }
 744         }
 745
 746         virtual void OnPostConnect(userrec* user)
 747         {
 748                 // This occurs AFTER OnUserConnect so we can be sure the
 749                 // protocol module has propogated the NICK message.
 750                 if ((user->GetExt("ssl", dummy)) && (IS_LOCAL(user)))
 751                 {
 752                         // Tell whatever protocol module we're using that we need to inform other servers of this metadata NOW.
 753                         std::deque<std::string>* metadata = new std::deque<std::string>;
 754                         metadata->push_back(user->nick);
 755                         metadata->push_back("ssl");             // The metadata id
 756                         metadata->push_back("ON");              // The value to send
 757                         Event* event = new Event((char*)metadata,(Module*)this,"send_metadata");
 758                         event->Send(ServerInstance);            // Trigger the event. We don't care what module picks it up.
 759                         DELETE(event);
 760                         DELETE(metadata);
 761
 762                         VerifyCertificate(&sessions[user->GetFd()], user);
 763                 }
 764         }
 765
 766         void MakePollWrite(issl_session* session)
 767         {
 768                 OnRawSocketWrite(session->fd, NULL, 0);
 769         }
 770
 771         void CloseSession(issl_session* session)
 772         {
 773                 if (session->sess)
 774                 {
 775                         SSL_shutdown(session->sess);
 776                         SSL_free(session->sess);
 777                 }
 778
 779                 if (session->inbuf)
 780                 {
 781                         delete[] session->inbuf;
 782                 }
 783
 784                 session->outbuf.clear();
 785                 session->inbuf = NULL;
 786                 session->sess = NULL;
 787                 session->status = ISSL_NONE;
 788         }
 789
 790         void VerifyCertificate(issl_session* session, Extensible* user)
 791         {
 792                 X509* cert;
 793                 ssl_cert* certinfo = new ssl_cert;
 794                 unsigned int n;
 795                 unsigned char md[EVP_MAX_MD_SIZE];
 796                 const EVP_MD *digest = EVP_md5();
 797
 798                 user->Extend("ssl_cert",certinfo);
 799
 800                 cert = SSL_get_peer_certificate((SSL*)session->sess);
 801
 802                 if (!cert)
 803                 {
 804                         certinfo->data.insert(std::make_pair("error","Could not get peer certificate: "+std::string(get_error())));
 805                         return;
 806                 }
 807
 808                 certinfo->data.insert(std::make_pair("invalid", SSL_get_verify_result(session->sess) != X509_V_OK ? ConvToStr(1) : ConvToStr(0)));
 809
 810                 if (SelfSigned)
 811                 {
 812                         certinfo->data.insert(std::make_pair("unknownsigner",ConvToStr(0)));
 813                         certinfo->data.insert(std::make_pair("trusted",ConvToStr(1)));
 814                 }
 815                 else
 816                 {
 817                         certinfo->data.insert(std::make_pair("unknownsigner",ConvToStr(1)));
 818                         certinfo->data.insert(std::make_pair("trusted",ConvToStr(0)));
 819                 }
 820
 821                 certinfo->data.insert(std::make_pair("dn",std::string(X509_NAME_oneline(X509_get_subject_name(cert),0,0))));
 822                 certinfo->data.insert(std::make_pair("issuer",std::string(X509_NAME_oneline(X509_get_issuer_name(cert),0,0))));
 823
 824                 if (!X509_digest(cert, digest, md, &n))
 825                 {
 826                         certinfo->data.insert(std::make_pair("error","Out of memory generating fingerprint"));
 827                 }
 828                 else
 829                 {
 830                         certinfo->data.insert(std::make_pair("fingerprint",irc::hex(md, n)));
 831                 }
 832
 833                 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))
 834                 {
 835                         certinfo->data.insert(std::make_pair("error","Not activated, or expired certificate"));
 836                 }
 837
 838                 X509_free(cert);
 839         }
 840 };
 841
 842 class ModuleSSLOpenSSLFactory : public ModuleFactory
 843 {
 844  public:
 845         ModuleSSLOpenSSLFactory()
 846         {
 847         }
 848
 849         ~ModuleSSLOpenSSLFactory()
 850         {
 851         }
 852
 853         virtual Module * CreateModule(InspIRCd* Me)
 854         {
 855                 return new ModuleSSLOpenSSL(Me);
 856         }
 857 };
 858
 859
 860 extern "C" void * init_module( void )
 861 {
 862         return new ModuleSSLOpenSSLFactory;
 863 }