src/modules/extra/m_ssl_openssl.cpp

   1 #include <string>
   2 #include <vector>
   3
   4 #include <openssl/ssl.h>
   5 #include <openssl/err.h>
   6
   7 #include "inspircd_config.h"
   8 #include "configreader.h"
   9 #include "users.h"
  10 #include "channels.h"
  11 #include "modules.h"
  12
  13 #include "socket.h"
  14 #include "hashcomp.h"
  15 #include "inspircd.h"
  16
  17 #include "transport.h"
  18
  19 /* $ModDesc: Provides SSL support for clients */
  20 /* $CompileFlags: `perl extra/openssl_config.pl compile` */
  21 /* $LinkerFlags: `perl extra/openssl_config.pl link` */
  22 /* $ModDep: transport.h */
  23
  24 enum issl_status { ISSL_NONE, ISSL_HANDSHAKING, ISSL_OPEN };
  25 enum issl_io_status { ISSL_WRITE, ISSL_READ };
  26
  27 static bool SelfSigned = false;
  28
  29 bool isin(int port, const std::vector<int> &portlist)
  30 {
  31         for(unsigned int i = 0; i < portlist.size(); i++)
  32                 if(portlist[i] == port)
  33                         return true;
  34
  35         return false;
  36 }
  37
  38 char* get_error()
  39 {
  40         return ERR_error_string(ERR_get_error(), NULL);
  41 }
  42
  43 /** Represents an SSL user's extra data
  44  */
  45 class issl_session : public classbase
  46 {
  47 public:
  48         SSL* sess;
  49         issl_status status;
  50         issl_io_status rstat;
  51         issl_io_status wstat;
  52
  53         unsigned int inbufoffset;
  54         char* inbuf;                    // Buffer OpenSSL reads into.
  55         std::string outbuf;     // Buffer for outgoing data that OpenSSL will not take.
  56         int fd;
  57
  58         issl_session()
  59         {
  60                 rstat = ISSL_READ;
  61                 wstat = ISSL_WRITE;
  62         }
  63 };
  64
  65 static int OnVerify(int preverify_ok, X509_STORE_CTX *ctx)
  66 {
  67         /* XXX: This will allow self signed certificates.
  68          * In the future if we want an option to not allow this,
  69          * we can just return preverify_ok here, and openssl
  70          * will boot off self-signed and invalid peer certs.
  71          */
  72         int ve = X509_STORE_CTX_get_error(ctx);
  73
  74         SelfSigned = (ve == X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT);
  75
  76         return 1;
  77 }
  78
  79 class ModuleSSLOpenSSL : public Module
  80 {
  81
  82         ConfigReader* Conf;
  83
  84         CullList* culllist;
  85
  86         std::vector<int> listenports;
  87
  88         int inbufsize;
  89         issl_session sessions[MAX_DESCRIPTORS];
  90
  91         SSL_CTX* ctx;
  92
  93         char* dummy;
  94
  95         std::string keyfile;
  96         std::string certfile;
  97         std::string cafile;
  98         // std::string crlfile;
  99         std::string dhfile;
 100
 101  public:
 102
 103         ModuleSSLOpenSSL(InspIRCd* Me)
 104                 : Module::Module(Me)
 105         {
 106                 culllist = new CullList(ServerInstance);
 107
 108                 ServerInstance->PublishInterface("InspSocketHook", this);
 109
 110                 // Not rehashable...because I cba to reduce all the sizes of existing buffers.
 111                 inbufsize = ServerInstance->Config->NetBufferSize;
 112
 113                 /* Global SSL library initialization*/
 114                 SSL_library_init();
 115                 SSL_load_error_strings();
 116
 117                 /* Build our SSL context*/
 118                 ctx = SSL_CTX_new( SSLv23_server_method() );
 119
 120                 SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER | SSL_VERIFY_CLIENT_ONCE, OnVerify);
 121
 122                 // Needs the flag as it ignores a plain /rehash
 123                 OnRehash("ssl");
 124         }
 125
 126         virtual void OnRehash(const std::string &param)
 127         {
 128                 if (param != "ssl")
 129                         return;
 130
 131                 Conf = new ConfigReader(ServerInstance);
 132
 133                 for (unsigned int i = 0; i < listenports.size(); i++)
 134                 {
 135                         ServerInstance->Config->DelIOHook(listenports[i]);
 136                 }
 137
 138                 listenports.clear();
 139
 140                 for (int i = 0; i < Conf->Enumerate("bind"); i++)
 141                 {
 142                         // For each <bind> tag
 143                         if (((Conf->ReadValue("bind", "type", i) == "") || (Conf->ReadValue("bind", "type", i) == "clients")) && (Conf->ReadValue("bind", "ssl", i) == "openssl"))
 144                         {
 145                                 // Get the port we're meant to be listening on with SSL
 146                                 std::string port = Conf->ReadValue("bind", "port", i);
 147                                 irc::portparser portrange(port, false);
 148                                 long portno = -1;
 149                                 while ((portno = portrange.GetToken()))
 150                                 {
 151                                         if (ServerInstance->Config->AddIOHook(portno, this))
 152                                         {
 153                                                 listenports.push_back(portno);
 154                                                 ServerInstance->Log(DEFAULT, "m_ssl_openssl.so: Enabling SSL for port %d", portno);
 155                                         }
 156                                         else
 157                                         {
 158                                                 ServerInstance->Log(DEFAULT, "m_ssl_openssl.so: FAILED to enable SSL on port %d, maybe you have another ssl or similar module loaded?", portno);
 159                                         }
 160                                 }
 161                         }
 162                 }
 163
 164                 std::string confdir(CONFIG_FILE);
 165                 // +1 so we the path ends with a /
 166                 confdir = confdir.substr(0, confdir.find_last_of('/') + 1);
 167
 168                 cafile   = Conf->ReadValue("openssl", "cafile", 0);
 169                 certfile = Conf->ReadValue("openssl", "certfile", 0);
 170                 keyfile  = Conf->ReadValue("openssl", "keyfile", 0);
 171                 dhfile   = Conf->ReadValue("openssl", "dhfile", 0);
 172
 173                 // Set all the default values needed.
 174                 if (cafile == "")
 175                         cafile = "ca.pem";
 176
 177                 if (certfile == "")
 178                         certfile = "cert.pem";
 179
 180                 if (keyfile == "")
 181                         keyfile = "key.pem";
 182
 183                 if (dhfile == "")
 184                         dhfile = "dhparams.pem";
 185
 186                 // Prepend relative paths with the path to the config directory.
 187                 if (cafile[0] != '/')
 188                         cafile = confdir + cafile;
 189
 190                 //if(crlfile[0] != '/')
 191                 //      crlfile = confdir + crlfile;
 192
 193                 if (certfile[0] != '/')
 194                         certfile = confdir + certfile;
 195
 196                 if (keyfile[0] != '/')
 197                         keyfile = confdir + keyfile;
 198
 199                 if (dhfile[0] != '/')
 200                         dhfile = confdir + dhfile;
 201
 202                 /* Load our keys and certificates*/
 203                 if (!SSL_CTX_use_certificate_chain_file(ctx, certfile.c_str()))
 204                 {
 205                         ServerInstance->Log(DEFAULT, "m_ssl_openssl.so: Can't read certificate file %s", certfile.c_str());
 206                 }
 207
 208                 if (!SSL_CTX_use_PrivateKey_file(ctx, keyfile.c_str(), SSL_FILETYPE_PEM))
 209                 {
 210                         ServerInstance->Log(DEFAULT, "m_ssl_openssl.so: Can't read key file %s", keyfile.c_str());
 211                 }
 212
 213                 /* Load the CAs we trust*/
 214                 if (!SSL_CTX_load_verify_locations(ctx, cafile.c_str(), 0))
 215                 {
 216                         ServerInstance->Log(DEFAULT, "m_ssl_openssl.so: Can't read CA list from ", cafile.c_str());
 217                 }
 218
 219                 FILE* dhpfile = fopen(dhfile.c_str(), "r");
 220                 DH* ret;
 221
 222                 if (dhpfile == NULL)
 223                 {
 224                         ServerInstance->Log(DEFAULT, "m_ssl_openssl.so Couldn't open DH file %s: %s", dhfile.c_str(), strerror(errno));
 225                         throw ModuleException("Couldn't open DH file " + dhfile + ": " + strerror(errno));
 226                 }
 227                 else
 228                 {
 229                         ret = PEM_read_DHparams(dhpfile, NULL, NULL, NULL);
 230
 231                         if(SSL_CTX_set_tmp_dh(ctx, ret) < 0)
 232                         {
 233                                 ServerInstance->Log(DEFAULT, "m_ssl_openssl.so: Couldn't set DH parameters");
 234                         }
 235                 }
 236
 237                 fclose(dhpfile);
 238
 239                 DELETE(Conf);
 240         }
 241
 242         virtual ~ModuleSSLOpenSSL()
 243         {
 244                 SSL_CTX_free(ctx);
 245                 delete culllist;
 246         }
 247
 248         virtual void OnCleanup(int target_type, void* item)
 249         {
 250                 if (target_type == TYPE_USER)
 251                 {
 252                         userrec* user = (userrec*)item;
 253
 254                         if (user->GetExt("ssl", dummy) && IS_LOCAL(user) && isin(user->GetPort(), listenports))
 255                         {
 256                                 // User is using SSL, they're a local user, and they're using one of *our* SSL ports.
 257                                 // Potentially there could be multiple SSL modules loaded at once on different ports.
 258                                 ServerInstance->Log(DEBUG, "m_ssl_openssl.so: Adding user %s to cull list", user->nick);
 259                                 culllist->AddItem(user, "SSL module unloading");
 260                         }
 261                         if (user->GetExt("ssl_cert", dummy) && isin(user->GetPort(), listenports))
 262                         {
 263                                 ssl_cert* tofree;
 264                                 user->GetExt("ssl_cert", tofree);
 265                                 delete tofree;
 266                                 user->Shrink("ssl_cert");
 267                         }
 268                 }
 269         }
 270
 271         virtual void OnUnloadModule(Module* mod, const std::string &name)
 272         {
 273                 if (mod == this)
 274                 {
 275                         // We're being unloaded, kill all the users added to the cull list in OnCleanup
 276                         int numusers = culllist->Apply();
 277                         ServerInstance->Log(DEBUG, "m_ssl_openssl.so: Killed %d users for unload of OpenSSL SSL module", numusers);
 278
 279                         for(unsigned int i = 0; i < listenports.size(); i++)
 280                                 ServerInstance->Config->DelIOHook(listenports[i]);
 281                 }
 282         }
 283
 284         virtual Version GetVersion()
 285         {
 286                 return Version(1, 1, 0, 0, VF_VENDOR, API_VERSION);
 287         }
 288
 289         void Implements(char* List)
 290         {
 291                 List[I_OnRawSocketConnect] = List[I_OnRawSocketAccept] = List[I_OnRawSocketClose] = List[I_OnRawSocketRead] = List[I_OnRawSocketWrite] = List[I_OnCleanup] = 1;
 292                 List[I_OnRequest] = List[I_OnSyncUserMetaData] = List[I_OnDecodeMetaData] = List[I_OnUnloadModule] = List[I_OnRehash] = List[I_OnWhois] = List[I_OnPostConnect] = 1;
 293         }
 294
 295         virtual char* OnRequest(Request* request)
 296         {
 297                 ISHRequest* ISR = (ISHRequest*)request;
 298                 ServerInstance->Log(DEBUG, "hook OnRequest");
 299                 if (strcmp("IS_NAME", request->GetId()) == 0)
 300                 {
 301                         return "openssl";
 302                 }
 303                 else if (strcmp("IS_HOOK", request->GetId()) == 0)
 304                 {
 305                         ServerInstance->Log(DEBUG, "Hooking socket %08x", ISR->Sock);
 306                         return ServerInstance->Config->AddIOHook((Module*)this, (InspSocket*)ISR->Sock) ? (char*)"OK" : NULL;
 307                 }
 308                 else if (strcmp("IS_UNHOOK", request->GetId()) == 0)
 309                 {
 310                         ServerInstance->Log(DEBUG, "Unhooking socket %08x", ISR->Sock);
 311                         return ServerInstance->Config->DelIOHook((InspSocket*)ISR->Sock) ? (char*)"OK" : NULL;
 312                 }
 313                 else if (strcmp("IS_HSDONE", request->GetId()) == 0)
 314                 {
 315                         issl_session* session = &sessions[ISR->Sock->GetFd()];
 316                         return (session->status == ISSL_HANDSHAKING) ? NULL : (char*)"OK";
 317                 }
 318                 else if (strcmp("IS_ATTACH", request->GetId()) == 0)
 319                 {
 320                         issl_session* session = &sessions[ISR->Sock->GetFd()];
 321                         if (session)
 322                         {
 323                                 VerifyCertificate(session, (InspSocket*)ISR->Sock);
 324                                 return "OK";
 325                         }
 326                 }
 327                 return NULL;
 328         }
 329
 330
 331         virtual void OnRawSocketAccept(int fd, const std::string &ip, int localport)
 332         {
 333                 ServerInstance->Log(DEBUG, "Hook accept %d", fd);
 334                 issl_session* session = &sessions[fd];
 335
 336                 session->fd = fd;
 337                 session->inbuf = new char[inbufsize];
 338                 session->inbufoffset = 0;
 339                 session->sess = SSL_new(ctx);
 340                 session->status = ISSL_NONE;
 341
 342                 if (session->sess == NULL)
 343                 {
 344                         ServerInstance->Log(DEBUG, "m_ssl.so: Couldn't create SSL object: %s", get_error());
 345                         return;
 346                 }
 347
 348                 if (SSL_set_fd(session->sess, fd) == 0)
 349                 {
 350                         ServerInstance->Log(DEBUG, "m_ssl.so: Couldn't set fd for SSL object: %s", get_error());
 351                         return;
 352                 }
 353
 354                 Handshake(session);
 355         }
 356
 357         virtual void OnRawSocketConnect(int fd)
 358         {
 359                 issl_session* session = &sessions[fd];
 360
 361                 session->fd = fd;
 362                 session->inbuf = new char[inbufsize];
 363                 session->inbufoffset = 0;
 364                 session->sess = SSL_new(ctx);
 365                 session->status = ISSL_NONE;
 366
 367                 if (session->sess == NULL)
 368                 {
 369                         ServerInstance->Log(DEBUG, "m_ssl.so: Couldn't create SSL object: %s", get_error());
 370                         return;
 371                 }
 372
 373                 if (SSL_set_fd(session->sess, fd) == 0)
 374                 {
 375                         ServerInstance->Log(DEBUG, "m_ssl.so: Couldn't set fd for SSL object: %s", get_error());
 376                         return;
 377                 }
 378
 379                 Handshake(session);
 380         }
 381
 382         virtual void OnRawSocketClose(int fd)
 383         {
 384                 ServerInstance->Log(DEBUG, "m_ssl_openssl.so: OnRawSocketClose: %d", fd);
 385                 CloseSession(&sessions[fd]);
 386
 387                 EventHandler* user = ServerInstance->SE->GetRef(fd);
 388
 389                 if ((user) && (user->GetExt("ssl_cert", dummy)))
 390                 {
 391                         ssl_cert* tofree;
 392                         user->GetExt("ssl_cert", tofree);
 393                         delete tofree;
 394                         user->Shrink("ssl_cert");
 395                 }
 396         }
 397
 398         virtual int OnRawSocketRead(int fd, char* buffer, unsigned int count, int &readresult)
 399         {
 400                 issl_session* session = &sessions[fd];
 401
 402                 if (!session->sess)
 403                 {
 404                         ServerInstance->Log(DEBUG, "m_ssl_openssl.so: OnRawSocketRead: No session to read from");
 405                         readresult = 0;
 406                         CloseSession(session);
 407                         return 1;
 408                 }
 409
 410                 if (session->status == ISSL_HANDSHAKING)
 411                 {
 412                         if (session->rstat == ISSL_READ || session->wstat == ISSL_READ)
 413                         {
 414                                 // The handshake isn't finished and it wants to read, try to finish it.
 415                                 if (Handshake(session))
 416                                 {
 417                                         // Handshake successfully resumed.
 418                                         ServerInstance->Log(DEBUG, "m_ssl_openssl.so: OnRawSocketRead: successfully resumed handshake");
 419                                 }
 420                                 else
 421                                 {
 422                                         // Couldn't resume handshake.
 423                                         ServerInstance->Log(DEBUG, "m_ssl_openssl.so: OnRawSocketRead: failed to resume handshake");
 424                                         return -1;
 425                                 }
 426                         }
 427                         else
 428                         {
 429                                 ServerInstance->Log(DEBUG, "m_ssl_openssl.so: OnRawSocketRead: handshake wants to write data but we are currently reading");
 430                                 return -1;
 431                         }
 432                 }
 433
 434                 // If we resumed the handshake then session->status will be ISSL_OPEN
 435
 436                 if (session->status == ISSL_OPEN)
 437                 {
 438                         if (session->wstat == ISSL_READ)
 439                         {
 440                                 if(DoWrite(session) == 0)
 441                                         return 0;
 442                         }
 443
 444                         if (session->rstat == ISSL_READ)
 445                         {
 446                                 int ret = DoRead(session);
 447
 448                                 if (ret > 0)
 449                                 {
 450                                         if (count <= session->inbufoffset)
 451                                         {
 452                                                 memcpy(buffer, session->inbuf, count);
 453                                                 // Move the stuff left in inbuf to the beginning of it
 454                                                 memcpy(session->inbuf, session->inbuf + count, (session->inbufoffset - count));
 455                                                 // Now we need to set session->inbufoffset to the amount of data still waiting to be handed to insp.
 456                                                 session->inbufoffset -= count;
 457                                                 // Insp uses readresult as the count of how much data there is in buffer, so:
 458                                                 readresult = count;
 459                                         }
 460                                         else
 461                                         {
 462                                                 // There's not as much in the inbuf as there is space in the buffer, so just copy the whole thing.
 463                                                 memcpy(buffer, session->inbuf, session->inbufoffset);
 464
 465                                                 readresult = session->inbufoffset;
 466                                                 // Zero the offset, as there's nothing there..
 467                                                 session->inbufoffset = 0;
 468                                         }
 469
 470                                         return 1;
 471                                 }
 472                                 else
 473                                 {
 474                                         return ret;
 475                                 }
 476                         }
 477                 }
 478
 479                 return -1;
 480         }
 481
 482         virtual int OnRawSocketWrite(int fd, const char* buffer, int count)
 483         {
 484                 issl_session* session = &sessions[fd];
 485
 486                 if (!session->sess)
 487                 {
 488                         ServerInstance->Log(DEBUG, "m_ssl_openssl.so: OnRawSocketWrite: No session to write to");
 489                         CloseSession(session);
 490                         return 1;
 491                 }
 492
 493                 session->outbuf.append(buffer, count);
 494
 495                 if (session->status == ISSL_HANDSHAKING)
 496                 {
 497                         // The handshake isn't finished, try to finish it.
 498                         if (session->rstat == ISSL_WRITE || session->wstat == ISSL_WRITE)
 499                         {
 500                                 if (Handshake(session))
 501                                 {
 502                                         // Handshake successfully resumed.
 503                                         ServerInstance->Log(DEBUG, "m_ssl_openssl.so: OnRawSocketWrite: successfully resumed handshake");
 504                                 }
 505                                 else
 506                                 {
 507                                         // Couldn't resume handshake.
 508                                         ServerInstance->Log(DEBUG, "m_ssl_openssl.so: OnRawSocketWrite: failed to resume handshake");
 509                                 }
 510                         }
 511                         else
 512                         {
 513                                 ServerInstance->Log(DEBUG, "m_ssl_openssl.so: OnRawSocketWrite: handshake wants to read data but we are currently writing");
 514                         }
 515                 }
 516
 517                 if (session->status == ISSL_OPEN)
 518                 {
 519                         if (session->rstat == ISSL_WRITE)
 520                         {
 521                                 DoRead(session);
 522                         }
 523
 524                         if (session->wstat == ISSL_WRITE)
 525                         {
 526                                 return DoWrite(session);
 527                         }
 528                 }
 529
 530                 return 1;
 531         }
 532
 533         int DoWrite(issl_session* session)
 534         {
 535                 if (!session->outbuf.size())
 536                         return -1;
 537
 538                 ServerInstance->Log(DEBUG, "m_ssl_openssl.so: To write: %d", session->outbuf.size());
 539                 int ret = SSL_write(session->sess, session->outbuf.data(), session->outbuf.size());
 540
 541                 if (ret == 0)
 542                 {
 543                         ServerInstance->Log(DEBUG, "m_ssl_openssl.so: DoWrite: Client closed the connection");
 544                         CloseSession(session);
 545                         return 0;
 546                 }
 547                 else if (ret < 0)
 548                 {
 549                         int err = SSL_get_error(session->sess, ret);
 550
 551                         if (err == SSL_ERROR_WANT_WRITE)
 552                         {
 553                                 ServerInstance->Log(DEBUG, "m_ssl_openssl.so: DoWrite: Not all SSL data written, need to retry: %s", get_error());
 554                                 session->wstat = ISSL_WRITE;
 555                                 return -1;
 556                         }
 557                         else if (err == SSL_ERROR_WANT_READ)
 558                         {
 559                                 ServerInstance->Log(DEBUG, "m_ssl_openssl.so: DoWrite: Not all SSL data written but the damn thing wants to read instead: %s", get_error());
 560                                 session->wstat = ISSL_READ;
 561                                 return -1;
 562                         }
 563                         else
 564                         {
 565                                 ServerInstance->Log(DEBUG, "m_ssl_openssl.so: DoWrite: Error writing SSL data: %s", get_error());
 566                                 CloseSession(session);
 567                                 return 0;
 568                         }
 569                 }
 570                 else
 571                 {
 572                         session->outbuf = session->outbuf.substr(ret);
 573                         return ret;
 574                 }
 575         }
 576
 577         int DoRead(issl_session* session)
 578         {
 579                 // Is this right? Not sure if the unencrypted data is garaunteed to be the same length.
 580                 // Read into the inbuffer, offset from the beginning by the amount of data we have that insp hasn't taken yet.
 581
 582                 int ret = SSL_read(session->sess, session->inbuf + session->inbufoffset, inbufsize - session->inbufoffset);
 583
 584                 if (ret == 0)
 585                 {
 586                         // Client closed connection.
 587                         ServerInstance->Log(DEBUG, "m_ssl_openssl.so: DoRead: Client closed the connection");
 588                         CloseSession(session);
 589                         return 0;
 590                 }
 591                 else if (ret < 0)
 592                 {
 593                         int err = SSL_get_error(session->sess, ret);
 594
 595                         if (err == SSL_ERROR_WANT_READ)
 596                         {
 597                                 ServerInstance->Log(DEBUG, "m_ssl_openssl.so: DoRead: Not all SSL data read, need to retry: %s", get_error());
 598                                 session->rstat = ISSL_READ;
 599                                 return -1;
 600                         }
 601                         else if (err == SSL_ERROR_WANT_WRITE)
 602                         {
 603                                 ServerInstance->Log(DEBUG, "m_ssl_openssl.so: DoRead: Not all SSL data read but the damn thing wants to write instead: %s", get_error());
 604                                 session->rstat = ISSL_WRITE;
 605                                 return -1;
 606                         }
 607                         else
 608                         {
 609                                 ServerInstance->Log(DEBUG, "m_ssl_openssl.so: DoRead: Error reading SSL data: %s", get_error());
 610                                 CloseSession(session);
 611                                 return 0;
 612                         }
 613                 }
 614                 else
 615                 {
 616                         // Read successfully 'ret' bytes into inbuf + inbufoffset
 617                         // There are 'ret' + 'inbufoffset' bytes of data in 'inbuf'
 618                         // 'buffer' is 'count' long
 619
 620                         session->inbufoffset += ret;
 621
 622                         return ret;
 623                 }
 624         }
 625
 626         // :kenny.chatspike.net 320 Om Epy|AFK :is a Secure Connection
 627         virtual void OnWhois(userrec* source, userrec* dest)
 628         {
 629                 // Bugfix, only send this numeric for *our* SSL users
 630                 if (dest->GetExt("ssl", dummy) || (IS_LOCAL(dest) &&  isin(dest->GetPort(), listenports)))
 631                 {
 632                         ServerInstance->SendWhoisLine(source, dest, 320, "%s %s :is using a secure connection", source->nick, dest->nick);
 633                 }
 634         }
 635
 636         virtual void OnSyncUserMetaData(userrec* user, Module* proto, void* opaque, const std::string &extname)
 637         {
 638                 // check if the linking module wants to know about OUR metadata
 639                 if (extname == "ssl")
 640                 {
 641                         // check if this user has an swhois field to send
 642                         if(user->GetExt(extname, dummy))
 643                         {
 644                                 // call this function in the linking module, let it format the data how it
 645                                 // sees fit, and send it on its way. We dont need or want to know how.
 646                                 proto->ProtoSendMetaData(opaque, TYPE_USER, user, extname, "ON");
 647                         }
 648                 }
 649         }
 650
 651         virtual void OnDecodeMetaData(int target_type, void* target, const std::string &extname, const std::string &extdata)
 652         {
 653                 // check if its our metadata key, and its associated with a user
 654                 if ((target_type == TYPE_USER) && (extname == "ssl"))
 655                 {
 656                         userrec* dest = (userrec*)target;
 657                         // if they dont already have an ssl flag, accept the remote server's
 658                         if (!dest->GetExt(extname, dummy))
 659                         {
 660                                 dest->Extend(extname, "ON");
 661                         }
 662                 }
 663         }
 664
 665         bool Handshake(issl_session* session)
 666         {
 667                 int ret = SSL_accept(session->sess);
 668
 669                 if (ret < 0)
 670                 {
 671                         int err = SSL_get_error(session->sess, ret);
 672
 673                         if (err == SSL_ERROR_WANT_READ)
 674                         {
 675                                 ServerInstance->Log(DEBUG, "m_ssl_openssl.so: Handshake: Not completed, need to read again: %s", get_error());
 676                                 session->rstat = ISSL_READ;
 677                                 session->status = ISSL_HANDSHAKING;
 678                         }
 679                         else if (err == SSL_ERROR_WANT_WRITE)
 680                         {
 681                                 ServerInstance->Log(DEBUG, "m_ssl_openssl.so: Handshake: Not completed, need to write more data: %s", get_error());
 682                                 session->wstat = ISSL_WRITE;
 683                                 session->status = ISSL_HANDSHAKING;
 684                                 MakePollWrite(session);
 685                         }
 686                         else
 687                         {
 688                                 ServerInstance->Log(DEBUG, "m_ssl_openssl.so: Handshake: Failed, bailing: %s", get_error());
 689                                 CloseSession(session);
 690                         }
 691
 692                         return false;
 693                 }
 694                 else
 695                 {
 696                         // Handshake complete.
 697                         ServerInstance->Log(DEBUG, "m_ssl_openssl.so: Handshake completed");
 698
 699                         // This will do for setting the ssl flag...it could be done earlier if it's needed. But this seems neater.
 700                         userrec* u = ServerInstance->FindDescriptor(session->fd);
 701                         if (u)
 702                         {
 703                                 if (!u->GetExt("ssl", dummy))
 704                                         u->Extend("ssl", "ON");
 705                         }
 706
 707                         session->status = ISSL_OPEN;
 708
 709                         MakePollWrite(session);
 710
 711                         return true;
 712                 }
 713         }
 714
 715         virtual void OnPostConnect(userrec* user)
 716         {
 717                 // This occurs AFTER OnUserConnect so we can be sure the
 718                 // protocol module has propogated the NICK message.
 719                 if ((user->GetExt("ssl", dummy)) && (IS_LOCAL(user)))
 720                 {
 721                         // Tell whatever protocol module we're using that we need to inform other servers of this metadata NOW.
 722                         std::deque<std::string>* metadata = new std::deque<std::string>;
 723                         metadata->push_back(user->nick);
 724                         metadata->push_back("ssl");             // The metadata id
 725                         metadata->push_back("ON");              // The value to send
 726                         Event* event = new Event((char*)metadata,(Module*)this,"send_metadata");
 727                         event->Send(ServerInstance);            // Trigger the event. We don't care what module picks it up.
 728                         DELETE(event);
 729                         DELETE(metadata);
 730
 731                         VerifyCertificate(&sessions[user->GetFd()], user);
 732                 }
 733         }
 734
 735         void MakePollWrite(issl_session* session)
 736         {
 737                 OnRawSocketWrite(session->fd, NULL, 0);
 738         }
 739
 740         void CloseSession(issl_session* session)
 741         {
 742                 if (session->sess)
 743                 {
 744                         SSL_shutdown(session->sess);
 745                         SSL_free(session->sess);
 746                 }
 747
 748                 if (session->inbuf)
 749                 {
 750                         delete[] session->inbuf;
 751                 }
 752
 753                 session->outbuf.clear();
 754                 session->inbuf = NULL;
 755                 session->sess = NULL;
 756                 session->status = ISSL_NONE;
 757         }
 758
 759         void VerifyCertificate(issl_session* session, Extensible* user)
 760         {
 761                 X509* cert;
 762                 ssl_cert* certinfo = new ssl_cert;
 763                 unsigned int n;
 764                 unsigned char md[EVP_MAX_MD_SIZE];
 765                 const EVP_MD *digest = EVP_md5();
 766
 767                 user->Extend("ssl_cert",certinfo);
 768
 769                 cert = SSL_get_peer_certificate((SSL*)session->sess);
 770
 771                 if (!cert)
 772                 {
 773                         certinfo->data.insert(std::make_pair("error","Could not get peer certificate: "+std::string(get_error())));
 774                         return;
 775                 }
 776
 777                 certinfo->data.insert(std::make_pair("invalid", SSL_get_verify_result(session->sess) != X509_V_OK ? ConvToStr(1) : ConvToStr(0)));
 778
 779                 if (SelfSigned)
 780                 {
 781                         certinfo->data.insert(std::make_pair("unknownsigner",ConvToStr(0)));
 782                         certinfo->data.insert(std::make_pair("trusted",ConvToStr(1)));
 783                 }
 784                 else
 785                 {
 786                         certinfo->data.insert(std::make_pair("unknownsigner",ConvToStr(1)));
 787                         certinfo->data.insert(std::make_pair("trusted",ConvToStr(0)));
 788                 }
 789
 790                 certinfo->data.insert(std::make_pair("dn",std::string(X509_NAME_oneline(X509_get_subject_name(cert),0,0))));
 791                 certinfo->data.insert(std::make_pair("issuer",std::string(X509_NAME_oneline(X509_get_issuer_name(cert),0,0))));
 792
 793                 if (!X509_digest(cert, digest, md, &n))
 794                 {
 795                         certinfo->data.insert(std::make_pair("error","Out of memory generating fingerprint"));
 796                 }
 797                 else
 798                 {
 799                         certinfo->data.insert(std::make_pair("fingerprint",irc::hex(md, n)));
 800                 }
 801
 802                 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))
 803                 {
 804                         certinfo->data.insert(std::make_pair("error","Not activated, or expired certificate"));
 805                 }
 806
 807                 X509_free(cert);
 808         }
 809 };
 810
 811 class ModuleSSLOpenSSLFactory : public ModuleFactory
 812 {
 813  public:
 814         ModuleSSLOpenSSLFactory()
 815         {
 816         }
 817
 818         ~ModuleSSLOpenSSLFactory()
 819         {
 820         }
 821
 822         virtual Module * CreateModule(InspIRCd* Me)
 823         {
 824                 return new ModuleSSLOpenSSL(Me);
 825         }
 826 };
 827
 828
 829 extern "C" void * init_module( void )
 830 {
 831         return new ModuleSSLOpenSSLFactory;
 832 }