src/modules/extra/m_ssl_openssl.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2007 InspIRCd Development Team
   6  * See: http://www.inspircd.org/wiki/index.php/Credits
   7  *
   8  * This program is free but copyrighted software; see
   9  *            the file COPYING for details.
  10  *
  11  * ---------------------------------------------------
  12  */
  13
  14 #include "inspircd.h"
  15
  16 #include <openssl/ssl.h>
  17 #include <openssl/err.h>
  18
  19 #ifdef WINDOWS
  20 #include <openssl/applink.c>
  21 #endif
  22
  23 #include "configreader.h"
  24 #include "users.h"
  25 #include "channels.h"
  26 #include "modules.h"
  27
  28 #include "socket.h"
  29 #include "hashcomp.h"
  30
  31 #include "transport.h"
  32
  33 #ifdef WINDOWS
  34 #pragma comment(lib, "libeay32MTd")
  35 #pragma comment(lib, "ssleay32MTd")
  36 #undef MAX_DESCRIPTORS
  37 #define MAX_DESCRIPTORS 10000
  38 #endif
  39
  40 /* $ModDesc: Provides SSL support for clients */
  41 /* $CompileFlags: pkgconfversion("openssl","0.9.7") pkgconfincludes("openssl","/openssl/ssl.h","") */
  42 /* $LinkerFlags: rpath("pkg-config --libs openssl") pkgconflibs("openssl","/libssl.so","-lssl -lcrypto -ldl") */
  43 /* $ModDep: transport.h */
  44
  45 enum issl_status { ISSL_NONE, ISSL_HANDSHAKING, ISSL_OPEN };
  46 enum issl_io_status { ISSL_WRITE, ISSL_READ };
  47
  48 static bool SelfSigned = false;
  49
  50 bool isin(int port, const std::vector<int> &portlist)
  51 {
  52         for(unsigned int i = 0; i < portlist.size(); i++)
  53                 if(portlist[i] == port)
  54                         return true;
  55
  56         return false;
  57 }
  58
  59 char* get_error()
  60 {
  61         return ERR_error_string(ERR_get_error(), NULL);
  62 }
  63
  64 static int error_callback(const char *str, size_t len, void *u);
  65
  66 /** Represents an SSL user's extra data
  67  */
  68 class issl_session : public classbase
  69 {
  70 public:
  71         SSL* sess;
  72         issl_status status;
  73         issl_io_status rstat;
  74         issl_io_status wstat;
  75
  76         unsigned int inbufoffset;
  77         char* inbuf;                    // Buffer OpenSSL reads into.
  78         std::string outbuf;     // Buffer for outgoing data that OpenSSL will not take.
  79         int fd;
  80         bool outbound;
  81
  82         issl_session()
  83         {
  84                 outbound = false;
  85                 rstat = ISSL_READ;
  86                 wstat = ISSL_WRITE;
  87         }
  88 };
  89
  90 static int OnVerify(int preverify_ok, X509_STORE_CTX *ctx)
  91 {
  92         /* XXX: This will allow self signed certificates.
  93          * In the future if we want an option to not allow this,
  94          * we can just return preverify_ok here, and openssl
  95          * will boot off self-signed and invalid peer certs.
  96          */
  97         int ve = X509_STORE_CTX_get_error(ctx);
  98
  99         SelfSigned = (ve == X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT);
 100
 101         return 1;
 102 }
 103
 104 class ModuleSSLOpenSSL : public Module
 105 {
 106
 107         ConfigReader* Conf;
 108
 109         std::vector<int> listenports;
 110
 111         int inbufsize;
 112         issl_session sessions[MAX_DESCRIPTORS];
 113
 114         SSL_CTX* ctx;
 115         SSL_CTX* clictx;
 116
 117         char* dummy;
 118         char cipher[MAXBUF];
 119
 120         std::string keyfile;
 121         std::string certfile;
 122         std::string cafile;
 123         // std::string crlfile;
 124         std::string dhfile;
 125         std::string sslports;
 126
 127         int clientactive;
 128
 129  public:
 130
 131         InspIRCd* PublicInstance;
 132
 133         ModuleSSLOpenSSL(InspIRCd* Me)
 134                 : Module(Me), PublicInstance(Me)
 135         {
 136                 ServerInstance->PublishInterface("InspSocketHook", this);
 137
 138                 // Not rehashable...because I cba to reduce all the sizes of existing buffers.
 139                 inbufsize = ServerInstance->Config->NetBufferSize;
 140
 141                 /* Global SSL library initialization*/
 142                 SSL_library_init();
 143                 SSL_load_error_strings();
 144
 145                 /* Build our SSL contexts:
 146                  * NOTE: OpenSSL makes us have two contexts, one for servers and one for clients. ICK.
 147                  */
 148                 ctx = SSL_CTX_new( SSLv23_server_method() );
 149                 clictx = SSL_CTX_new( SSLv23_client_method() );
 150
 151                 SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER | SSL_VERIFY_CLIENT_ONCE, OnVerify);
 152                 SSL_CTX_set_verify(clictx, SSL_VERIFY_PEER | SSL_VERIFY_CLIENT_ONCE, OnVerify);
 153
 154                 // Needs the flag as it ignores a plain /rehash
 155                 OnRehash(NULL,"ssl");
 156         }
 157
 158         virtual void OnRehash(userrec* user, const std::string &param)
 159         {
 160                 if (param != "ssl")
 161                         return;
 162
 163                 Conf = new ConfigReader(ServerInstance);
 164
 165                 for (unsigned int i = 0; i < listenports.size(); i++)
 166                 {
 167                         ServerInstance->Config->DelIOHook(listenports[i]);
 168                 }
 169
 170                 listenports.clear();
 171                 clientactive = 0;
 172                 sslports.clear();
 173
 174                 for (int i = 0; i < Conf->Enumerate("bind"); i++)
 175                 {
 176                         // For each <bind> tag
 177                         std::string x = Conf->ReadValue("bind", "type", i);
 178                         if (((x.empty()) || (x == "clients")) && (Conf->ReadValue("bind", "ssl", i) == "openssl"))
 179                         {
 180                                 // Get the port we're meant to be listening on with SSL
 181                                 std::string port = Conf->ReadValue("bind", "port", i);
 182                                 irc::portparser portrange(port, false);
 183                                 long portno = -1;
 184                                 while ((portno = portrange.GetToken()))
 185                                 {
 186                                         clientactive++;
 187                                         try
 188                                         {
 189                                                 if (ServerInstance->Config->AddIOHook(portno, this))
 190                                                 {
 191                                                         listenports.push_back(portno);
 192                                                                 for (size_t i = 0; i < ServerInstance->Config->ports.size(); i++)
 193                                                                 if (ServerInstance->Config->ports[i]->GetPort() == portno)
 194                                                                         ServerInstance->Config->ports[i]->SetDescription("ssl");
 195                                                         ServerInstance->Log(DEFAULT, "m_ssl_openssl.so: Enabling SSL for port %d", portno);
 196                                                         sslports.append("*:").append(ConvToStr(portno)).append(";");
 197                                                 }
 198                                                 else
 199                                                 {
 200                                                         ServerInstance->Log(DEFAULT, "m_ssl_openssl.so: FAILED to enable SSL on port %d, maybe you have another ssl or similar module loaded?", portno);
 201                                                 }
 202                                         }
 203                                         catch (ModuleException &e)
 204                                         {
 205                                                 ServerInstance->Log(DEFAULT, "m_ssl_openssl.so: FAILED to enable SSL on port %d: %s. Maybe it's already hooked by the same port on a different IP, or you have another SSL or similar module loaded?", portno, e.GetReason());
 206                                         }
 207                                 }
 208                         }
 209                 }
 210
 211                 if (!sslports.empty())
 212                         sslports.erase(sslports.end() - 1);
 213
 214                 std::string confdir(ServerInstance->ConfigFileName);
 215                 // +1 so we the path ends with a /
 216                 confdir = confdir.substr(0, confdir.find_last_of('/') + 1);
 217
 218                 cafile   = Conf->ReadValue("openssl", "cafile", 0);
 219                 certfile = Conf->ReadValue("openssl", "certfile", 0);
 220                 keyfile  = Conf->ReadValue("openssl", "keyfile", 0);
 221                 dhfile   = Conf->ReadValue("openssl", "dhfile", 0);
 222
 223                 // Set all the default values needed.
 224                 if (cafile.empty())
 225                         cafile = "ca.pem";
 226
 227                 if (certfile.empty())
 228                         certfile = "cert.pem";
 229
 230                 if (keyfile.empty())
 231                         keyfile = "key.pem";
 232
 233                 if (dhfile.empty())
 234                         dhfile = "dhparams.pem";
 235
 236                 // Prepend relative paths with the path to the config directory.
 237                 if (cafile[0] != '/')
 238                         cafile = confdir + cafile;
 239
 240                 if (certfile[0] != '/')
 241                         certfile = confdir + certfile;
 242
 243                 if (keyfile[0] != '/')
 244                         keyfile = confdir + keyfile;
 245
 246                 if (dhfile[0] != '/')
 247                         dhfile = confdir + dhfile;
 248
 249                 /* Load our keys and certificates
 250                  * NOTE: OpenSSL's error logging API sucks, don't blame us for this clusterfuck.
 251                  */
 252                 if ((!SSL_CTX_use_certificate_chain_file(ctx, certfile.c_str())) || (!SSL_CTX_use_certificate_chain_file(clictx, certfile.c_str())))
 253                 {
 254                         ServerInstance->Log(DEFAULT, "m_ssl_openssl.so: Can't read certificate file %s. %s", certfile.c_str(), strerror(errno));
 255                         ERR_print_errors_cb(error_callback, this);
 256                 }
 257
 258                 if (((!SSL_CTX_use_PrivateKey_file(ctx, keyfile.c_str(), SSL_FILETYPE_PEM))) || (!SSL_CTX_use_PrivateKey_file(clictx, keyfile.c_str(), SSL_FILETYPE_PEM)))
 259                 {
 260                         ServerInstance->Log(DEFAULT, "m_ssl_openssl.so: Can't read key file %s. %s", keyfile.c_str(), strerror(errno));
 261                         ERR_print_errors_cb(error_callback, this);
 262                 }
 263
 264                 /* Load the CAs we trust*/
 265                 if (((!SSL_CTX_load_verify_locations(ctx, cafile.c_str(), 0))) || (!SSL_CTX_load_verify_locations(clictx, cafile.c_str(), 0)))
 266                 {
 267                         ServerInstance->Log(DEFAULT, "m_ssl_openssl.so: Can't read CA list from %s. %s", cafile.c_str(), strerror(errno));
 268                         ERR_print_errors_cb(error_callback, this);
 269                 }
 270
 271                 FILE* dhpfile = fopen(dhfile.c_str(), "r");
 272                 DH* ret;
 273
 274                 if (dhpfile == NULL)
 275                 {
 276                         ServerInstance->Log(DEFAULT, "m_ssl_openssl.so Couldn't open DH file %s: %s", dhfile.c_str(), strerror(errno));
 277                         throw ModuleException("Couldn't open DH file " + dhfile + ": " + strerror(errno));
 278                 }
 279                 else
 280                 {
 281                         ret = PEM_read_DHparams(dhpfile, NULL, NULL, NULL);
 282                         if ((SSL_CTX_set_tmp_dh(ctx, ret) < 0) || (SSL_CTX_set_tmp_dh(clictx, ret) < 0))
 283                         {
 284                                 ServerInstance->Log(DEFAULT, "m_ssl_openssl.so: Couldn't set DH parameters %s. SSL errors follow:", dhfile.c_str());
 285                                 ERR_print_errors_cb(error_callback, this);
 286                         }
 287                 }
 288
 289                 fclose(dhpfile);
 290
 291                 DELETE(Conf);
 292         }
 293
 294         virtual void On005Numeric(std::string &output)
 295         {
 296                 output.append(" SSL=" + sslports);
 297         }
 298
 299         virtual ~ModuleSSLOpenSSL()
 300         {
 301                 SSL_CTX_free(ctx);
 302                 SSL_CTX_free(clictx);
 303         }
 304
 305         virtual void OnCleanup(int target_type, void* item)
 306         {
 307                 if (target_type == TYPE_USER)
 308                 {
 309                         userrec* user = (userrec*)item;
 310
 311                         if (user->GetExt("ssl", dummy) && IS_LOCAL(user) && isin(user->GetPort(), listenports))
 312                         {
 313                                 // User is using SSL, they're a local user, and they're using one of *our* SSL ports.
 314                                 // Potentially there could be multiple SSL modules loaded at once on different ports.
 315                                 userrec::QuitUser(ServerInstance, user, "SSL module unloading");
 316                         }
 317                         if (user->GetExt("ssl_cert", dummy) && isin(user->GetPort(), listenports))
 318                         {
 319                                 ssl_cert* tofree;
 320                                 user->GetExt("ssl_cert", tofree);
 321                                 delete tofree;
 322                                 user->Shrink("ssl_cert");
 323                         }
 324                 }
 325         }
 326
 327         virtual void OnUnloadModule(Module* mod, const std::string &name)
 328         {
 329                 if (mod == this)
 330                 {
 331                         for(unsigned int i = 0; i < listenports.size(); i++)
 332                         {
 333                                 ServerInstance->Config->DelIOHook(listenports[i]);
 334                                 for (size_t j = 0; j < ServerInstance->Config->ports.size(); j++)
 335                                         if (ServerInstance->Config->ports[j]->GetPort() == listenports[i])
 336                                                 ServerInstance->Config->ports[j]->SetDescription("plaintext");
 337                         }
 338                 }
 339         }
 340
 341         virtual Version GetVersion()
 342         {
 343                 return Version(1, 1, 0, 0, VF_VENDOR, API_VERSION);
 344         }
 345
 346         void Implements(char* List)
 347         {
 348                 List[I_OnRawSocketConnect] = List[I_OnRawSocketAccept] = List[I_OnRawSocketClose] = List[I_OnRawSocketRead] = List[I_OnRawSocketWrite] = List[I_OnCleanup] = List[I_On005Numeric] = 1;
 349                 List[I_OnRequest] = List[I_OnSyncUserMetaData] = List[I_OnDecodeMetaData] = List[I_OnUnloadModule] = List[I_OnRehash] = List[I_OnWhois] = List[I_OnPostConnect] = 1;
 350         }
 351
 352         virtual char* OnRequest(Request* request)
 353         {
 354                 ISHRequest* ISR = (ISHRequest*)request;
 355                 if (strcmp("IS_NAME", request->GetId()) == 0)
 356                 {
 357                         return "openssl";
 358                 }
 359                 else if (strcmp("IS_HOOK", request->GetId()) == 0)
 360                 {
 361                         char* ret = "OK";
 362                         try
 363                         {
 364                                 ret = ServerInstance->Config->AddIOHook((Module*)this, (InspSocket*)ISR->Sock) ? (char*)"OK" : NULL;
 365                         }
 366                         catch (ModuleException &e)
 367                         {
 368                                 return NULL;
 369                         }
 370
 371                         return ret;
 372                 }
 373                 else if (strcmp("IS_UNHOOK", request->GetId()) == 0)
 374                 {
 375                         return ServerInstance->Config->DelIOHook((InspSocket*)ISR->Sock) ? (char*)"OK" : NULL;
 376                 }
 377                 else if (strcmp("IS_HSDONE", request->GetId()) == 0)
 378                 {
 379                         ServerInstance->Log(DEBUG,"Module checking if handshake is done");
 380                         if (ISR->Sock->GetFd() < 0)
 381                                 return (char*)"OK";
 382
 383                         issl_session* session = &sessions[ISR->Sock->GetFd()];
 384                         return (session->status == ISSL_HANDSHAKING) ? NULL : (char*)"OK";
 385                 }
 386                 else if (strcmp("IS_ATTACH", request->GetId()) == 0)
 387                 {
 388                         issl_session* session = &sessions[ISR->Sock->GetFd()];
 389                         if (session->sess)
 390                         {
 391                                 VerifyCertificate(session, (InspSocket*)ISR->Sock);
 392                                 return "OK";
 393                         }
 394                 }
 395                 return NULL;
 396         }
 397
 398
 399         virtual void OnRawSocketAccept(int fd, const std::string &ip, int localport)
 400         {
 401                 issl_session* session = &sessions[fd];
 402
 403                 session->fd = fd;
 404                 session->inbuf = new char[inbufsize];
 405                 session->inbufoffset = 0;
 406                 session->sess = SSL_new(ctx);
 407                 session->status = ISSL_NONE;
 408                 session->outbound = false;
 409
 410                 if (session->sess == NULL)
 411                         return;
 412
 413                 if (SSL_set_fd(session->sess, fd) == 0)
 414                 {
 415                         ServerInstance->Log(DEBUG,"BUG: Can't set fd with SSL_set_fd: %d", fd);
 416                         return;
 417                 }
 418
 419                 Handshake(session);
 420         }
 421
 422         virtual void OnRawSocketConnect(int fd)
 423         {
 424                 ServerInstance->Log(DEBUG,"OnRawSocketConnect connecting");
 425                 issl_session* session = &sessions[fd];
 426
 427                 session->fd = fd;
 428                 session->inbuf = new char[inbufsize];
 429                 session->inbufoffset = 0;
 430                 session->sess = SSL_new(clictx);
 431                 session->status = ISSL_NONE;
 432                 session->outbound = true;
 433
 434                 if (session->sess == NULL)
 435                         return;
 436
 437                 if (SSL_set_fd(session->sess, fd) == 0)
 438                 {
 439                         ServerInstance->Log(DEBUG,"BUG: Can't set fd with SSL_set_fd: %d", fd);
 440                         return;
 441                 }
 442
 443                 Handshake(session);
 444                 ServerInstance->Log(DEBUG,"Exiting OnRawSocketConnect");
 445         }
 446
 447         virtual void OnRawSocketClose(int fd)
 448         {
 449                 CloseSession(&sessions[fd]);
 450
 451                 EventHandler* user = ServerInstance->SE->GetRef(fd);
 452
 453                 if ((user) && (user->GetExt("ssl_cert", dummy)))
 454                 {
 455                         ssl_cert* tofree;
 456                         user->GetExt("ssl_cert", tofree);
 457                         delete tofree;
 458                         user->Shrink("ssl_cert");
 459                 }
 460         }
 461
 462         virtual int OnRawSocketRead(int fd, char* buffer, unsigned int count, int &readresult)
 463         {
 464                 issl_session* session = &sessions[fd];
 465
 466                 ServerInstance->Log(DEBUG,"OnRawSocketRead");
 467
 468                 if (!session->sess)
 469                 {
 470                         ServerInstance->Log(DEBUG,"OnRawSocketRead has no session");
 471                         readresult = 0;
 472                         CloseSession(session);
 473                         return 1;
 474                 }
 475
 476                 if (session->status == ISSL_HANDSHAKING)
 477                 {
 478                         if (session->rstat == ISSL_READ || session->wstat == ISSL_READ)
 479                         {
 480                                 ServerInstance->Log(DEBUG,"Resume handshake in read");
 481                                 // The handshake isn't finished and it wants to read, try to finish it.
 482                                 if (!Handshake(session))
 483                                 {
 484                                         ServerInstance->Log(DEBUG,"Cant resume handshake in read");
 485                                         // Couldn't resume handshake.
 486                                         return -1;
 487                                 }
 488                         }
 489                         else
 490                         {
 491                                 errno = EAGAIN;
 492                                 return -1;
 493                         }
 494                 }
 495
 496                 // If we resumed the handshake then session->status will be ISSL_OPEN
 497
 498                 if (session->status == ISSL_OPEN)
 499                 {
 500                         if (session->wstat == ISSL_READ)
 501                         {
 502                                 if(DoWrite(session) == 0)
 503                                         return 0;
 504                         }
 505
 506                         if (session->rstat == ISSL_READ)
 507                         {
 508                                 int ret = DoRead(session);
 509
 510                                 if (ret > 0)
 511                                 {
 512                                         if (count <= session->inbufoffset)
 513                                         {
 514                                                 memcpy(buffer, session->inbuf, count);
 515                                                 // Move the stuff left in inbuf to the beginning of it
 516                                                 memcpy(session->inbuf, session->inbuf + count, (session->inbufoffset - count));
 517                                                 // Now we need to set session->inbufoffset to the amount of data still waiting to be handed to insp.
 518                                                 session->inbufoffset -= count;
 519                                                 // Insp uses readresult as the count of how much data there is in buffer, so:
 520                                                 readresult = count;
 521                                         }
 522                                         else
 523                                         {
 524                                                 // There's not as much in the inbuf as there is space in the buffer, so just copy the whole thing.
 525                                                 memcpy(buffer, session->inbuf, session->inbufoffset);
 526
 527                                                 readresult = session->inbufoffset;
 528                                                 // Zero the offset, as there's nothing there..
 529                                                 session->inbufoffset = 0;
 530                                         }
 531
 532                                         return 1;
 533                                 }
 534                                 else
 535                                 {
 536                                         return ret;
 537                                 }
 538                         }
 539                 }
 540
 541                 return -1;
 542         }
 543
 544         virtual int OnRawSocketWrite(int fd, const char* buffer, int count)
 545         {
 546                 issl_session* session = &sessions[fd];
 547
 548                 if (!session->sess)
 549                 {
 550                         ServerInstance->Log(DEBUG,"Close session missing sess");
 551                         CloseSession(session);
 552                         return -1;
 553                 }
 554
 555                 session->outbuf.append(buffer, count);
 556
 557                 if (session->status == ISSL_HANDSHAKING)
 558                 {
 559                         // The handshake isn't finished, try to finish it.
 560                         if (session->rstat == ISSL_WRITE || session->wstat == ISSL_WRITE)
 561                         {
 562                                 ServerInstance->Log(DEBUG,"Handshake resume");
 563                                 Handshake(session);
 564                         }
 565                 }
 566
 567                 if (session->status == ISSL_OPEN)
 568                 {
 569                         if (session->rstat == ISSL_WRITE)
 570                         {
 571                                 ServerInstance->Log(DEBUG,"DoRead");
 572                                 DoRead(session);
 573                         }
 574
 575                         if (session->wstat == ISSL_WRITE)
 576                         {
 577                                 ServerInstance->Log(DEBUG,"DoWrite");
 578                                 return DoWrite(session);
 579                         }
 580                 }
 581
 582                 return 1;
 583         }
 584
 585         int DoWrite(issl_session* session)
 586         {
 587                 if (!session->outbuf.size())
 588                         return -1;
 589
 590                 int ret = SSL_write(session->sess, session->outbuf.data(), session->outbuf.size());
 591
 592                 if (ret == 0)
 593                 {
 594                         ServerInstance->Log(DEBUG,"Oops, got 0 from SSL_write");
 595                         CloseSession(session);
 596                         return 0;
 597                 }
 598                 else if (ret < 0)
 599                 {
 600                         int err = SSL_get_error(session->sess, ret);
 601
 602                         if (err == SSL_ERROR_WANT_WRITE)
 603                         {
 604                                 session->wstat = ISSL_WRITE;
 605                                 return -1;
 606                         }
 607                         else if (err == SSL_ERROR_WANT_READ)
 608                         {
 609                                 session->wstat = ISSL_READ;
 610                                 return -1;
 611                         }
 612                         else
 613                         {
 614                                 ServerInstance->Log(DEBUG,"Close due to returned -1 in SSL_Write");
 615                                 CloseSession(session);
 616                                 return 0;
 617                         }
 618                 }
 619                 else
 620                 {
 621                         session->outbuf = session->outbuf.substr(ret);
 622                         return ret;
 623                 }
 624         }
 625
 626         int DoRead(issl_session* session)
 627         {
 628                 // Is this right? Not sure if the unencrypted data is garaunteed to be the same length.
 629                 // Read into the inbuffer, offset from the beginning by the amount of data we have that insp hasn't taken yet.
 630
 631                 ServerInstance->Log(DEBUG,"DoRead");
 632
 633                 int ret = SSL_read(session->sess, session->inbuf + session->inbufoffset, inbufsize - session->inbufoffset);
 634
 635                 if (ret == 0)
 636                 {
 637                         // Client closed connection.
 638                         ServerInstance->Log(DEBUG,"Oops, got 0 from SSL_read");
 639                         CloseSession(session);
 640                         return 0;
 641                 }
 642                 else if (ret < 0)
 643                 {
 644                         int err = SSL_get_error(session->sess, ret);
 645
 646                         if (err == SSL_ERROR_WANT_READ)
 647                         {
 648                                 session->rstat = ISSL_READ;
 649                                 ServerInstance->Log(DEBUG,"Setting want_read");
 650                                 return -1;
 651                         }
 652                         else if (err == SSL_ERROR_WANT_WRITE)
 653                         {
 654                                 session->rstat = ISSL_WRITE;
 655                                 ServerInstance->Log(DEBUG,"Setting want_write");
 656                                 return -1;
 657                         }
 658                         else
 659                         {
 660                                 ServerInstance->Log(DEBUG,"Closed due to returned -1 in SSL_Read");
 661                                 CloseSession(session);
 662                                 return 0;
 663                         }
 664                 }
 665                 else
 666                 {
 667                         // Read successfully 'ret' bytes into inbuf + inbufoffset
 668                         // There are 'ret' + 'inbufoffset' bytes of data in 'inbuf'
 669                         // 'buffer' is 'count' long
 670
 671                         session->inbufoffset += ret;
 672
 673                         return ret;
 674                 }
 675         }
 676
 677         // :kenny.chatspike.net 320 Om Epy|AFK :is a Secure Connection
 678         virtual void OnWhois(userrec* source, userrec* dest)
 679         {
 680                 if (!clientactive)
 681                         return;
 682
 683                 // Bugfix, only send this numeric for *our* SSL users
 684                 if (dest->GetExt("ssl", dummy) || (IS_LOCAL(dest) &&  isin(dest->GetPort(), listenports)))
 685                 {
 686                         ServerInstance->SendWhoisLine(source, dest, 320, "%s %s :is using a secure connection", source->nick, dest->nick);
 687                 }
 688         }
 689
 690         virtual void OnSyncUserMetaData(userrec* user, Module* proto, void* opaque, const std::string &extname, bool displayable)
 691         {
 692                 // check if the linking module wants to know about OUR metadata
 693                 if (extname == "ssl")
 694                 {
 695                         // check if this user has an swhois field to send
 696                         if(user->GetExt(extname, dummy))
 697                         {
 698                                 // call this function in the linking module, let it format the data how it
 699                                 // sees fit, and send it on its way. We dont need or want to know how.
 700                                 proto->ProtoSendMetaData(opaque, TYPE_USER, user, extname, displayable ? "Enabled" : "ON");
 701                         }
 702                 }
 703         }
 704
 705         virtual void OnDecodeMetaData(int target_type, void* target, const std::string &extname, const std::string &extdata)
 706         {
 707                 // check if its our metadata key, and its associated with a user
 708                 if ((target_type == TYPE_USER) && (extname == "ssl"))
 709                 {
 710                         userrec* dest = (userrec*)target;
 711                         // if they dont already have an ssl flag, accept the remote server's
 712                         if (!dest->GetExt(extname, dummy))
 713                         {
 714                                 dest->Extend(extname, "ON");
 715                         }
 716                 }
 717         }
 718
 719         bool Handshake(issl_session* session)
 720         {
 721                 ServerInstance->Log(DEBUG,"Handshake");
 722                 int ret;
 723
 724                 if (session->outbound)
 725                 {
 726                         ServerInstance->Log(DEBUG,"SSL_connect");
 727                         ret = SSL_connect(session->sess);
 728                 }
 729                 else
 730                         ret = SSL_accept(session->sess);
 731
 732                 if (ret < 0)
 733                 {
 734                         int err = SSL_get_error(session->sess, ret);
 735
 736                         if (err == SSL_ERROR_WANT_READ)
 737                         {
 738                                 ServerInstance->Log(DEBUG,"Want read, handshaking");
 739                                 session->rstat = ISSL_READ;
 740                                 session->status = ISSL_HANDSHAKING;
 741                                 return true;
 742                         }
 743                         else if (err == SSL_ERROR_WANT_WRITE)
 744                         {
 745                                 ServerInstance->Log(DEBUG,"Want write, handshaking");
 746                                 session->wstat = ISSL_WRITE;
 747                                 session->status = ISSL_HANDSHAKING;
 748                                 MakePollWrite(session);
 749                                 return true;
 750                         }
 751                         else
 752                         {
 753                                 ServerInstance->Log(DEBUG,"Handshake failed");
 754                                 CloseSession(session);
 755                         }
 756
 757                         return false;
 758                 }
 759                 else if (ret > 0)
 760                 {
 761                         // Handshake complete.
 762                         // This will do for setting the ssl flag...it could be done earlier if it's needed. But this seems neater.
 763                         userrec* u = ServerInstance->FindDescriptor(session->fd);
 764                         if (u)
 765                         {
 766                                 if (!u->GetExt("ssl", dummy))
 767                                         u->Extend("ssl", "ON");
 768                         }
 769
 770                         session->status = ISSL_OPEN;
 771
 772                         MakePollWrite(session);
 773
 774                         return true;
 775                 }
 776                 else if (ret == 0)
 777                 {
 778                         int ssl_err = SSL_get_error(session->sess, ret);
 779                         char buf[1024];
 780                         ERR_print_errors_fp(stderr);
 781                         ServerInstance->Log(DEBUG,"Handshake fail 2: %d: %s", ssl_err, ERR_error_string(ssl_err,buf));
 782                         CloseSession(session);
 783                         return true;
 784                 }
 785
 786                 return true;
 787         }
 788
 789         virtual void OnPostConnect(userrec* user)
 790         {
 791                 // This occurs AFTER OnUserConnect so we can be sure the
 792                 // protocol module has propogated the NICK message.
 793                 if ((user->GetExt("ssl", dummy)) && (IS_LOCAL(user)))
 794                 {
 795                         // Tell whatever protocol module we're using that we need to inform other servers of this metadata NOW.
 796                         std::deque<std::string>* metadata = new std::deque<std::string>;
 797                         metadata->push_back(user->nick);
 798                         metadata->push_back("ssl");             // The metadata id
 799                         metadata->push_back("ON");              // The value to send
 800                         Event* event = new Event((char*)metadata,(Module*)this,"send_metadata");
 801                         event->Send(ServerInstance);            // Trigger the event. We don't care what module picks it up.
 802                         DELETE(event);
 803                         DELETE(metadata);
 804
 805                         VerifyCertificate(&sessions[user->GetFd()], user);
 806                         if (sessions[user->GetFd()].sess)
 807                                 user->WriteServ("NOTICE %s :*** You are connected using SSL cipher \"%s\"", user->nick, SSL_get_cipher(sessions[user->GetFd()].sess));
 808                 }
 809         }
 810
 811         void MakePollWrite(issl_session* session)
 812         {
 813                 OnRawSocketWrite(session->fd, NULL, 0);
 814                 //EventHandler* eh = ServerInstance->FindDescriptor(session->fd);
 815                 //if (eh)
 816                 //      ServerInstance->SE->WantWrite(eh);
 817         }
 818
 819         void CloseSession(issl_session* session)
 820         {
 821                 if (session->sess)
 822                 {
 823                         SSL_shutdown(session->sess);
 824                         SSL_free(session->sess);
 825                 }
 826
 827                 if (session->inbuf)
 828                 {
 829                         delete[] session->inbuf;
 830                 }
 831
 832                 session->outbuf.clear();
 833                 session->inbuf = NULL;
 834                 session->sess = NULL;
 835                 session->status = ISSL_NONE;
 836         }
 837
 838         void VerifyCertificate(issl_session* session, Extensible* user)
 839         {
 840                 if (!session->sess || !user)
 841                         return;
 842
 843                 X509* cert;
 844                 ssl_cert* certinfo = new ssl_cert;
 845                 unsigned int n;
 846                 unsigned char md[EVP_MAX_MD_SIZE];
 847                 const EVP_MD *digest = EVP_md5();
 848
 849                 user->Extend("ssl_cert",certinfo);
 850
 851                 cert = SSL_get_peer_certificate((SSL*)session->sess);
 852
 853                 if (!cert)
 854                 {
 855                         certinfo->data.insert(std::make_pair("error","Could not get peer certificate: "+std::string(get_error())));
 856                         return;
 857                 }
 858
 859                 certinfo->data.insert(std::make_pair("invalid", SSL_get_verify_result(session->sess) != X509_V_OK ? ConvToStr(1) : ConvToStr(0)));
 860
 861                 if (SelfSigned)
 862                 {
 863                         certinfo->data.insert(std::make_pair("unknownsigner",ConvToStr(0)));
 864                         certinfo->data.insert(std::make_pair("trusted",ConvToStr(1)));
 865                 }
 866                 else
 867                 {
 868                         certinfo->data.insert(std::make_pair("unknownsigner",ConvToStr(1)));
 869                         certinfo->data.insert(std::make_pair("trusted",ConvToStr(0)));
 870                 }
 871
 872                 certinfo->data.insert(std::make_pair("dn",std::string(X509_NAME_oneline(X509_get_subject_name(cert),0,0))));
 873                 certinfo->data.insert(std::make_pair("issuer",std::string(X509_NAME_oneline(X509_get_issuer_name(cert),0,0))));
 874
 875                 if (!X509_digest(cert, digest, md, &n))
 876                 {
 877                         certinfo->data.insert(std::make_pair("error","Out of memory generating fingerprint"));
 878                 }
 879                 else
 880                 {
 881                         certinfo->data.insert(std::make_pair("fingerprint",irc::hex(md, n)));
 882                 }
 883
 884                 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))
 885                 {
 886                         certinfo->data.insert(std::make_pair("error","Not activated, or expired certificate"));
 887                 }
 888
 889                 X509_free(cert);
 890         }
 891 };
 892
 893 static int error_callback(const char *str, size_t len, void *u)
 894 {
 895         ModuleSSLOpenSSL* mssl = (ModuleSSLOpenSSL*)u;
 896         mssl->PublicInstance->Log(DEFAULT, "SSL error: " + std::string(str, len - 1));
 897         return 0;
 898 }
 899
 900 MODULE_INIT(ModuleSSLOpenSSL);
 901