src/modules/extra/m_ssl_openssl.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2009 InspIRCd Development Team
   6  * See: http://wiki.inspircd.org/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 #include <openssl/ssl.h>
  16 #include <openssl/err.h>
  17 #include "transport.h"
  18
  19 #ifdef WINDOWS
  20 #pragma comment(lib, "libeay32MTd")
  21 #pragma comment(lib, "ssleay32MTd")
  22 #undef MAX_DESCRIPTORS
  23 #define MAX_DESCRIPTORS 10000
  24 #endif
  25
  26 /* $ModDesc: Provides SSL support for clients */
  27
  28 /* $LinkerFlags: if("USE_FREEBSD_BASE_SSL") -lssl -lcrypto */
  29 /* $CompileFlags: if(!"USE_FREEBSD_BASE_SSL") pkgconfversion("openssl","0.9.7") pkgconfincludes("openssl","/openssl/ssl.h","") */
  30 /* $LinkerFlags: if(!"USE_FREEBSD_BASE_SSL") rpath("pkg-config --libs openssl") pkgconflibs("openssl","/libssl.so","-lssl -lcrypto -ldl") */
  31
  32 /* $ModDep: transport.h */
  33 /* $NoPedantic */
  34 /* $CopyInstall: conf/key.pem $(CONPATH) */
  35 /* $CopyInstall: conf/cert.pem $(CONPATH) */
  36
  37
  38 enum issl_status { ISSL_NONE, ISSL_HANDSHAKING, ISSL_OPEN };
  39 enum issl_io_status { ISSL_WRITE, ISSL_READ };
  40
  41 static bool SelfSigned = false;
  42
  43 bool isin(const std::string &host, int port, const std::vector<std::string> &portlist)
  44 {
  45         if (std::find(portlist.begin(), portlist.end(), "*:" + ConvToStr(port)) != portlist.end())
  46                 return true;
  47
  48         if (std::find(portlist.begin(), portlist.end(), ":" + ConvToStr(port)) != portlist.end())
  49                 return true;
  50
  51         return std::find(portlist.begin(), portlist.end(), host + ":" + ConvToStr(port)) != portlist.end();
  52 }
  53
  54 char* get_error()
  55 {
  56         return ERR_error_string(ERR_get_error(), NULL);
  57 }
  58
  59 static int error_callback(const char *str, size_t len, void *u);
  60
  61 /** Represents an SSL user's extra data
  62  */
  63 class issl_session : public classbase
  64 {
  65 public:
  66         SSL* sess;
  67         issl_status status;
  68         issl_io_status rstat;
  69         issl_io_status wstat;
  70
  71         unsigned int inbufoffset;
  72         char* inbuf;                    // Buffer OpenSSL reads into.
  73         std::string outbuf;     // Buffer for outgoing data that OpenSSL will not take.
  74         int fd;
  75         bool outbound;
  76
  77         issl_session()
  78         {
  79                 outbound = false;
  80                 rstat = ISSL_READ;
  81                 wstat = ISSL_WRITE;
  82         }
  83 };
  84
  85 static int OnVerify(int preverify_ok, X509_STORE_CTX *ctx)
  86 {
  87         /* XXX: This will allow self signed certificates.
  88          * In the future if we want an option to not allow this,
  89          * we can just return preverify_ok here, and openssl
  90          * will boot off self-signed and invalid peer certs.
  91          */
  92         int ve = X509_STORE_CTX_get_error(ctx);
  93
  94         SelfSigned = (ve == X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT);
  95
  96         return 1;
  97 }
  98
  99 class ModuleSSLOpenSSL : public Module
 100 {
 101         std::vector<std::string> listenports;
 102
 103         int inbufsize;
 104         issl_session* sessions;
 105
 106         SSL_CTX* ctx;
 107         SSL_CTX* clictx;
 108
 109         char* dummy;
 110         char cipher[MAXBUF];
 111
 112         std::string keyfile;
 113         std::string certfile;
 114         std::string cafile;
 115         // std::string crlfile;
 116         std::string dhfile;
 117         std::string sslports;
 118
 119         int clientactive;
 120
 121  public:
 122
 123         InspIRCd* PublicInstance;
 124
 125         ModuleSSLOpenSSL(InspIRCd* Me)
 126         : Module(Me), PublicInstance(Me)
 127         {
 128                 ServerInstance->Modules->PublishInterface("BufferedSocketHook", this);
 129
 130                 sessions = new issl_session[ServerInstance->SE->GetMaxFds()];
 131
 132                 // Not rehashable...because I cba to reduce all the sizes of existing buffers.
 133                 inbufsize = ServerInstance->Config->NetBufferSize;
 134
 135                 /* Global SSL library initialization*/
 136                 SSL_library_init();
 137                 SSL_load_error_strings();
 138
 139                 /* Build our SSL contexts:
 140                  * NOTE: OpenSSL makes us have two contexts, one for servers and one for clients. ICK.
 141                  */
 142                 ctx = SSL_CTX_new( SSLv23_server_method() );
 143                 clictx = SSL_CTX_new( SSLv23_client_method() );
 144
 145                 SSL_CTX_set_mode(ctx, SSL_MODE_ENABLE_PARTIAL_WRITE | SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER);
 146                 SSL_CTX_set_mode(clictx, SSL_MODE_ENABLE_PARTIAL_WRITE | SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER);
 147
 148                 SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER | SSL_VERIFY_CLIENT_ONCE, OnVerify);
 149                 SSL_CTX_set_verify(clictx, SSL_VERIFY_PEER | SSL_VERIFY_CLIENT_ONCE, OnVerify);
 150
 151                 // Needs the flag as it ignores a plain /rehash
 152                 OnModuleRehash(NULL,"ssl");
 153                 Implementation eventlist[] = { I_OnRawSocketConnect, I_OnRawSocketAccept,
 154                         I_OnRawSocketClose, I_OnRawSocketRead, I_OnRawSocketWrite, I_OnCleanup, I_On005Numeric,
 155                         I_OnBufferFlushed, I_OnRequest, I_OnUnloadModule, I_OnRehash, I_OnModuleRehash,
 156                         I_OnPostConnect, I_OnHookUserIO };
 157                 ServerInstance->Modules->Attach(eventlist, this, sizeof(eventlist)/sizeof(Implementation));
 158         }
 159
 160         virtual void OnHookUserIO(User* user)
 161         {
 162                 if (!user->GetIOHook() && isin(user->GetServerIP(),user->GetServerPort(), listenports))
 163                 {
 164                         /* Hook the user with our module */
 165                         user->AddIOHook(this);
 166                 }
 167         }
 168
 169         virtual void OnRehash(User* user)
 170         {
 171                 ConfigReader Conf(ServerInstance);
 172
 173                 listenports.clear();
 174                 clientactive = 0;
 175                 sslports.clear();
 176
 177                 for(int index = 0; index < Conf.Enumerate("bind"); index++)
 178                 {
 179                         // For each <bind> tag
 180                         std::string x = Conf.ReadValue("bind", "type", index);
 181                         if(((x.empty()) || (x == "clients")) && (Conf.ReadValue("bind", "ssl", index) == "openssl"))
 182                         {
 183                                 // Get the port we're meant to be listening on with SSL
 184                                 std::string port = Conf.ReadValue("bind", "port", index);
 185                                 std::string addr = Conf.ReadValue("bind", "address", index);
 186
 187                                 if (!addr.empty())
 188                                 {
 189                                         // normalize address, important for IPv6
 190                                         int portint = 0;
 191                                         irc::sockets::sockaddrs bin;
 192                                         if (irc::sockets::aptosa(addr.c_str(), portint, &bin))
 193                                                 irc::sockets::satoap(&bin, addr, portint);
 194                                 }
 195
 196                                 irc::portparser portrange(port, false);
 197                                 long portno = -1;
 198                                 while ((portno = portrange.GetToken()))
 199                                 {
 200                                         clientactive++;
 201                                         try
 202                                         {
 203                                                 listenports.push_back(addr + ":" + ConvToStr(portno));
 204
 205                                                 for (size_t i = 0; i < ServerInstance->ports.size(); i++)
 206                                                         if ((ServerInstance->ports[i]->GetPort() == portno) && (ServerInstance->ports[i]->GetIP() == addr))
 207                                                                 ServerInstance->ports[i]->SetDescription("ssl");
 208                                                 ServerInstance->Logs->Log("m_ssl_openssl",DEFAULT, "m_ssl_openssl.so: Enabling SSL for port %ld", portno);
 209
 210                                                 if (addr != "127.0.0.1")
 211                                                         sslports.append((addr.empty() ? "*" : addr)).append(":").append(ConvToStr(portno)).append(";");
 212                                         }
 213                                         catch (ModuleException &e)
 214                                         {
 215                                                 ServerInstance->Logs->Log("m_ssl_openssl",DEFAULT, "m_ssl_openssl.so: FAILED to enable SSL on port %ld: %s. Maybe it's already hooked by the same port on a different IP, or you have an other SSL or similar module loaded?", portno, e.GetReason());
 216                                         }
 217                                 }
 218                         }
 219                 }
 220
 221                 if (!sslports.empty())
 222                         sslports.erase(sslports.end() - 1);
 223         }
 224
 225         virtual void OnModuleRehash(User* user, const std::string &param)
 226         {
 227                 if (param != "ssl")
 228                         return;
 229
 230                 OnRehash(user);
 231
 232                 ConfigReader Conf(ServerInstance);
 233
 234                 std::string confdir(ServerInstance->ConfigFileName);
 235                 // +1 so we the path ends with a /
 236                 confdir = confdir.substr(0, confdir.find_last_of('/') + 1);
 237
 238                 cafile   = Conf.ReadValue("openssl", "cafile", 0);
 239                 certfile = Conf.ReadValue("openssl", "certfile", 0);
 240                 keyfile  = Conf.ReadValue("openssl", "keyfile", 0);
 241                 dhfile   = Conf.ReadValue("openssl", "dhfile", 0);
 242
 243                 // Set all the default values needed.
 244                 if (cafile.empty())
 245                         cafile = "ca.pem";
 246
 247                 if (certfile.empty())
 248                         certfile = "cert.pem";
 249
 250                 if (keyfile.empty())
 251                         keyfile = "key.pem";
 252
 253                 if (dhfile.empty())
 254                         dhfile = "dhparams.pem";
 255
 256                 // Prepend relative paths with the path to the config directory.
 257                 if ((cafile[0] != '/') && (!ServerInstance->Config->StartsWithWindowsDriveLetter(cafile)))
 258                         cafile = confdir + cafile;
 259
 260                 if ((certfile[0] != '/') && (!ServerInstance->Config->StartsWithWindowsDriveLetter(certfile)))
 261                         certfile = confdir + certfile;
 262
 263                 if ((keyfile[0] != '/') && (!ServerInstance->Config->StartsWithWindowsDriveLetter(keyfile)))
 264                         keyfile = confdir + keyfile;
 265
 266                 if ((dhfile[0] != '/') && (!ServerInstance->Config->StartsWithWindowsDriveLetter(dhfile)))
 267                         dhfile = confdir + dhfile;
 268
 269                 /* Load our keys and certificates
 270                  * NOTE: OpenSSL's error logging API sucks, don't blame us for this clusterfuck.
 271                  */
 272                 if ((!SSL_CTX_use_certificate_chain_file(ctx, certfile.c_str())) || (!SSL_CTX_use_certificate_chain_file(clictx, certfile.c_str())))
 273                 {
 274                         ServerInstance->Logs->Log("m_ssl_openssl",DEFAULT, "m_ssl_openssl.so: Can't read certificate file %s. %s", certfile.c_str(), strerror(errno));
 275                         ERR_print_errors_cb(error_callback, this);
 276                 }
 277
 278                 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)))
 279                 {
 280                         ServerInstance->Logs->Log("m_ssl_openssl",DEFAULT, "m_ssl_openssl.so: Can't read key file %s. %s", keyfile.c_str(), strerror(errno));
 281                         ERR_print_errors_cb(error_callback, this);
 282                 }
 283
 284                 /* Load the CAs we trust*/
 285                 if (((!SSL_CTX_load_verify_locations(ctx, cafile.c_str(), 0))) || (!SSL_CTX_load_verify_locations(clictx, cafile.c_str(), 0)))
 286                 {
 287                         ServerInstance->Logs->Log("m_ssl_openssl",DEFAULT, "m_ssl_openssl.so: Can't read CA list from %s. %s", cafile.c_str(), strerror(errno));
 288                         ERR_print_errors_cb(error_callback, this);
 289                 }
 290
 291                 FILE* dhpfile = fopen(dhfile.c_str(), "r");
 292                 DH* ret;
 293
 294                 if (dhpfile == NULL)
 295                 {
 296                         ServerInstance->Logs->Log("m_ssl_openssl",DEFAULT, "m_ssl_openssl.so Couldn't open DH file %s: %s", dhfile.c_str(), strerror(errno));
 297                         throw ModuleException("Couldn't open DH file " + dhfile + ": " + strerror(errno));
 298                 }
 299                 else
 300                 {
 301                         ret = PEM_read_DHparams(dhpfile, NULL, NULL, NULL);
 302                         if ((SSL_CTX_set_tmp_dh(ctx, ret) < 0) || (SSL_CTX_set_tmp_dh(clictx, ret) < 0))
 303                         {
 304                                 ServerInstance->Logs->Log("m_ssl_openssl",DEFAULT, "m_ssl_openssl.so: Couldn't set DH parameters %s. SSL errors follow:", dhfile.c_str());
 305                                 ERR_print_errors_cb(error_callback, this);
 306                         }
 307                 }
 308
 309                 fclose(dhpfile);
 310         }
 311
 312         virtual void On005Numeric(std::string &output)
 313         {
 314                 output.append(" SSL=" + sslports);
 315         }
 316
 317         virtual ~ModuleSSLOpenSSL()
 318         {
 319                 SSL_CTX_free(ctx);
 320                 SSL_CTX_free(clictx);
 321                 ServerInstance->Modules->UnpublishInterface("BufferedSocketHook", this);
 322                 delete[] sessions;
 323         }
 324
 325         virtual void OnCleanup(int target_type, void* item)
 326         {
 327                 if (target_type == TYPE_USER)
 328                 {
 329                         User* user = (User*)item;
 330
 331                         if (user->GetIOHook() == this)
 332                         {
 333                                 // User is using SSL, they're a local user, and they're using one of *our* SSL ports.
 334                                 // Potentially there could be multiple SSL modules loaded at once on different ports.
 335                                 ServerInstance->Users->QuitUser(user, "SSL module unloading");
 336                                 user->DelIOHook();
 337                         }
 338                         if (user->GetExt("ssl_cert", dummy))
 339                         {
 340                                 ssl_cert* tofree;
 341                                 user->GetExt("ssl_cert", tofree);
 342                                 delete tofree;
 343                                 user->Shrink("ssl_cert");
 344                         }
 345                 }
 346         }
 347
 348         virtual void OnUnloadModule(Module* mod, const std::string &name)
 349         {
 350                 if (mod == this)
 351                 {
 352                         for(unsigned int i = 0; i < listenports.size(); i++)
 353                         {
 354                                 for (size_t j = 0; j < ServerInstance->ports.size(); j++)
 355                                         if (listenports[i] == (ServerInstance->ports[j]->GetIP()+":"+ConvToStr(ServerInstance->ports[j]->GetPort())))
 356                                                 ServerInstance->ports[j]->SetDescription("plaintext");
 357                         }
 358                 }
 359         }
 360
 361         virtual Version GetVersion()
 362         {
 363                 return Version("$Id$", VF_VENDOR, API_VERSION);
 364         }
 365
 366
 367         virtual const char* OnRequest(Request* request)
 368         {
 369                 ISHRequest* ISR = (ISHRequest*)request;
 370                 if (strcmp("IS_NAME", request->GetId()) == 0)
 371                 {
 372                         return "openssl";
 373                 }
 374                 else if (strcmp("IS_HOOK", request->GetId()) == 0)
 375                 {
 376                         const char* ret = "OK";
 377                         try
 378                         {
 379                                 ret = ISR->Sock->AddIOHook((Module*)this) ? "OK" : NULL;
 380                         }
 381                         catch (ModuleException &e)
 382                         {
 383                                 return NULL;
 384                         }
 385
 386                         return ret;
 387                 }
 388                 else if (strcmp("IS_UNHOOK", request->GetId()) == 0)
 389                 {
 390                         return ISR->Sock->DelIOHook() ? "OK" : NULL;
 391                 }
 392                 else if (strcmp("IS_HSDONE", request->GetId()) == 0)
 393                 {
 394                         if (ISR->Sock->GetFd() < 0)
 395                                 return "OK";
 396
 397                         issl_session* session = &sessions[ISR->Sock->GetFd()];
 398                         return (session->status == ISSL_HANDSHAKING) ? NULL : "OK";
 399                 }
 400                 else if (strcmp("IS_ATTACH", request->GetId()) == 0)
 401                 {
 402                         issl_session* session = &sessions[ISR->Sock->GetFd()];
 403                         if (session->sess)
 404                         {
 405                                 VerifyCertificate(session, (BufferedSocket*)ISR->Sock);
 406                                 return "OK";
 407                         }
 408                 }
 409                 else if (strcmp("GET_FP", request->GetId()) == 0)
 410                 {
 411                         if (ISR->Sock->GetFd() > -1)
 412                         {
 413                                 issl_session* session = &sessions[ISR->Sock->GetFd()];
 414                                 if (session->sess)
 415                                 {
 416                                         Extensible* ext = ISR->Sock;
 417                                         ssl_cert* certinfo;
 418                                         if (ext->GetExt("ssl_cert",certinfo))
 419                                                 return certinfo->GetFingerprint().c_str();
 420                                 }
 421                         }
 422                 }
 423                 return NULL;
 424         }
 425
 426
 427         virtual void OnRawSocketAccept(int fd, irc::sockets::sockaddrs* client, irc::sockets::sockaddrs* server)
 428         {
 429                 /* Are there any possibilities of an out of range fd? Hope not, but lets be paranoid */
 430                 if ((fd < 0) || (fd > ServerInstance->SE->GetMaxFds() - 1))
 431                         return;
 432
 433                 issl_session* session = &sessions[fd];
 434
 435                 session->fd = fd;
 436                 session->inbuf = new char[inbufsize];
 437                 session->inbufoffset = 0;
 438                 session->sess = SSL_new(ctx);
 439                 session->status = ISSL_NONE;
 440                 session->outbound = false;
 441
 442                 if (session->sess == NULL)
 443                         return;
 444
 445                 if (SSL_set_fd(session->sess, fd) == 0)
 446                 {
 447                         ServerInstance->Logs->Log("m_ssl_openssl",DEBUG,"BUG: Can't set fd with SSL_set_fd: %d", fd);
 448                         return;
 449                 }
 450
 451                 Handshake(session);
 452         }
 453
 454         virtual void OnRawSocketConnect(int fd)
 455         {
 456                 /* Are there any possibilities of an out of range fd? Hope not, but lets be paranoid */
 457                 if ((fd < 0) || (fd > ServerInstance->SE->GetMaxFds() -1))
 458                         return;
 459
 460                 issl_session* session = &sessions[fd];
 461
 462                 session->fd = fd;
 463                 session->inbuf = new char[inbufsize];
 464                 session->inbufoffset = 0;
 465                 session->sess = SSL_new(clictx);
 466                 session->status = ISSL_NONE;
 467                 session->outbound = true;
 468
 469                 if (session->sess == NULL)
 470                         return;
 471
 472                 if (SSL_set_fd(session->sess, fd) == 0)
 473                 {
 474                         ServerInstance->Logs->Log("m_ssl_openssl",DEBUG,"BUG: Can't set fd with SSL_set_fd: %d", fd);
 475                         return;
 476                 }
 477
 478                 Handshake(session);
 479         }
 480
 481         virtual void OnRawSocketClose(int fd)
 482         {
 483                 /* Are there any possibilities of an out of range fd? Hope not, but lets be paranoid */
 484                 if ((fd < 0) || (fd > ServerInstance->SE->GetMaxFds() - 1))
 485                         return;
 486
 487                 CloseSession(&sessions[fd]);
 488
 489                 EventHandler* user = ServerInstance->SE->GetRef(fd);
 490
 491                 if ((user) && (user->GetExt("ssl_cert", dummy)))
 492                 {
 493                         ssl_cert* tofree;
 494                         user->GetExt("ssl_cert", tofree);
 495                         delete tofree;
 496                         user->Shrink("ssl_cert");
 497                 }
 498         }
 499
 500         virtual int OnRawSocketRead(int fd, char* buffer, unsigned int count, int &readresult)
 501         {
 502                 /* Are there any possibilities of an out of range fd? Hope not, but lets be paranoid */
 503                 if ((fd < 0) || (fd > ServerInstance->SE->GetMaxFds() - 1))
 504                         return 0;
 505
 506                 issl_session* session = &sessions[fd];
 507
 508                 if (!session->sess)
 509                 {
 510                         readresult = 0;
 511                         CloseSession(session);
 512                         return 1;
 513                 }
 514
 515                 if (session->status == ISSL_HANDSHAKING)
 516                 {
 517                         if (session->rstat == ISSL_READ || session->wstat == ISSL_READ)
 518                         {
 519                                 // The handshake isn't finished and it wants to read, try to finish it.
 520                                 if (!Handshake(session))
 521                                 {
 522                                         // Couldn't resume handshake.
 523                                         errno = session->status == ISSL_NONE ? EIO : EAGAIN;
 524                                         return -1;
 525                                 }
 526                         }
 527                         else
 528                         {
 529                                 errno = EAGAIN;
 530                                 return -1;
 531                         }
 532                 }
 533
 534                 // If we resumed the handshake then session->status will be ISSL_OPEN
 535
 536                 if (session->status == ISSL_OPEN)
 537                 {
 538                         if (session->wstat == ISSL_READ)
 539                         {
 540                                 if(DoWrite(session) == 0)
 541                                         return 0;
 542                         }
 543
 544                         if (session->rstat == ISSL_READ)
 545                         {
 546                                 int ret = DoRead(session);
 547
 548                                 if (ret > 0)
 549                                 {
 550                                         if (count <= session->inbufoffset)
 551                                         {
 552                                                 memcpy(buffer, session->inbuf, count);
 553                                                 // Move the stuff left in inbuf to the beginning of it
 554                                                 memmove(session->inbuf, session->inbuf + count, (session->inbufoffset - count));
 555                                                 // Now we need to set session->inbufoffset to the amount of data still waiting to be handed to insp.
 556                                                 session->inbufoffset -= count;
 557                                                 // Insp uses readresult as the count of how much data there is in buffer, so:
 558                                                 readresult = count;
 559                                         }
 560                                         else
 561                                         {
 562                                                 // There's not as much in the inbuf as there is space in the buffer, so just copy the whole thing.
 563                                                 memcpy(buffer, session->inbuf, session->inbufoffset);
 564
 565                                                 readresult = session->inbufoffset;
 566                                                 // Zero the offset, as there's nothing there..
 567                                                 session->inbufoffset = 0;
 568                                         }
 569                                         return 1;
 570                                 }
 571                                 return ret;
 572                         }
 573                 }
 574
 575                 return -1;
 576         }
 577
 578         virtual int OnRawSocketWrite(int fd, const char* buffer, int count)
 579         {
 580                 /* Are there any possibilities of an out of range fd? Hope not, but lets be paranoid */
 581                 if ((fd < 0) || (fd > ServerInstance->SE->GetMaxFds() - 1))
 582                         return 0;
 583
 584                 errno = EAGAIN;
 585                 issl_session* session = &sessions[fd];
 586
 587                 if (!session->sess)
 588                 {
 589                         CloseSession(session);
 590                         return -1;
 591                 }
 592
 593                 session->outbuf.append(buffer, count);
 594                 MakePollWrite(session);
 595
 596                 if (session->status == ISSL_HANDSHAKING)
 597                 {
 598                         // The handshake isn't finished, try to finish it.
 599                         if (session->rstat == ISSL_WRITE || session->wstat == ISSL_WRITE)
 600                         {
 601                                 if (!Handshake(session))
 602                                 {
 603                                         // Couldn't resume handshake.
 604                                         errno = session->status == ISSL_NONE ? EIO : EAGAIN;
 605                                         return -1;
 606                                 }
 607                         }
 608                 }
 609
 610                 if (session->status == ISSL_OPEN)
 611                 {
 612                         if (session->rstat == ISSL_WRITE)
 613                         {
 614                                 DoRead(session);
 615                         }
 616
 617                         if (session->wstat == ISSL_WRITE)
 618                         {
 619                                 return DoWrite(session);
 620                         }
 621                 }
 622
 623                 return 1;
 624         }
 625
 626         int DoWrite(issl_session* session)
 627         {
 628                 if (!session->outbuf.size())
 629                         return -1;
 630
 631                 int ret = SSL_write(session->sess, session->outbuf.data(), session->outbuf.size());
 632
 633                 if (ret == 0)
 634                 {
 635                         CloseSession(session);
 636                         return 0;
 637                 }
 638                 else if (ret < 0)
 639                 {
 640                         int err = SSL_get_error(session->sess, ret);
 641
 642                         if (err == SSL_ERROR_WANT_WRITE)
 643                         {
 644                                 session->wstat = ISSL_WRITE;
 645                                 return -1;
 646                         }
 647                         else if (err == SSL_ERROR_WANT_READ)
 648                         {
 649                                 session->wstat = ISSL_READ;
 650                                 return -1;
 651                         }
 652                         else
 653                         {
 654                                 CloseSession(session);
 655                                 return 0;
 656                         }
 657                 }
 658                 else
 659                 {
 660                         session->outbuf = session->outbuf.substr(ret);
 661                         return ret;
 662                 }
 663         }
 664
 665         int DoRead(issl_session* session)
 666         {
 667                 // Is this right? Not sure if the unencrypted data is garaunteed to be the same length.
 668                 // Read into the inbuffer, offset from the beginning by the amount of data we have that insp hasn't taken yet.
 669
 670                 int ret = SSL_read(session->sess, session->inbuf + session->inbufoffset, inbufsize - session->inbufoffset);
 671
 672                 if (ret == 0)
 673                 {
 674                         // Client closed connection.
 675                         CloseSession(session);
 676                         return 0;
 677                 }
 678                 else if (ret < 0)
 679                 {
 680                         int err = SSL_get_error(session->sess, ret);
 681
 682                         if (err == SSL_ERROR_WANT_READ)
 683                         {
 684                                 session->rstat = ISSL_READ;
 685                                 return -1;
 686                         }
 687                         else if (err == SSL_ERROR_WANT_WRITE)
 688                         {
 689                                 session->rstat = ISSL_WRITE;
 690                                 MakePollWrite(session);
 691                                 return -1;
 692                         }
 693                         else
 694                         {
 695                                 CloseSession(session);
 696                                 return 0;
 697                         }
 698                 }
 699                 else
 700                 {
 701                         // Read successfully 'ret' bytes into inbuf + inbufoffset
 702                         // There are 'ret' + 'inbufoffset' bytes of data in 'inbuf'
 703                         // 'buffer' is 'count' long
 704
 705                         session->inbufoffset += ret;
 706
 707                         return ret;
 708                 }
 709         }
 710
 711         bool Handshake(issl_session* session)
 712         {
 713                 int ret;
 714
 715                 if (session->outbound)
 716                         ret = SSL_connect(session->sess);
 717                 else
 718                         ret = SSL_accept(session->sess);
 719
 720                 if (ret < 0)
 721                 {
 722                         int err = SSL_get_error(session->sess, ret);
 723
 724                         if (err == SSL_ERROR_WANT_READ)
 725                         {
 726                                 session->rstat = ISSL_READ;
 727                                 session->status = ISSL_HANDSHAKING;
 728                                 return true;
 729                         }
 730                         else if (err == SSL_ERROR_WANT_WRITE)
 731                         {
 732                                 session->wstat = ISSL_WRITE;
 733                                 session->status = ISSL_HANDSHAKING;
 734                                 MakePollWrite(session);
 735                                 return true;
 736                         }
 737                         else
 738                         {
 739                                 CloseSession(session);
 740                         }
 741
 742                         return false;
 743                 }
 744                 else if (ret > 0)
 745                 {
 746                         // Handshake complete.
 747                         // This will do for setting the ssl flag...it could be done earlier if it's needed. But this seems neater.
 748                         EventHandler *u = ServerInstance->SE->GetRef(session->fd);
 749                         if (u)
 750                         {
 751                                 if (!u->GetExt("ssl", dummy))
 752                                         u->Extend("ssl", "ON");
 753                         }
 754
 755                         session->status = ISSL_OPEN;
 756
 757                         MakePollWrite(session);
 758
 759                         return true;
 760                 }
 761                 else if (ret == 0)
 762                 {
 763                         CloseSession(session);
 764                         return true;
 765                 }
 766
 767                 return true;
 768         }
 769
 770         virtual void OnPostConnect(User* user)
 771         {
 772                 // This occurs AFTER OnUserConnect so we can be sure the
 773                 // protocol module has propagated the NICK message.
 774                 if ((user->GetIOHook() == this) && (IS_LOCAL(user)))
 775                 {
 776                         ssl_cert* certdata = VerifyCertificate(&sessions[user->GetFd()], user);
 777                         if (sessions[user->GetFd()].sess)
 778                                 user->WriteServ("NOTICE %s :*** You are connected using SSL cipher \"%s\"", user->nick.c_str(), SSL_get_cipher(sessions[user->GetFd()].sess));
 779
 780                         ServerInstance->PI->SendMetaData(user, "ssl", "ON");
 781                         if (certdata)
 782                                 ServerInstance->PI->SendMetaData(user, "ssl_cert", certdata->GetMetaLine().c_str());
 783                 }
 784         }
 785
 786         void MakePollWrite(issl_session* session)
 787         {
 788                 //OnRawSocketWrite(session->fd, NULL, 0);
 789                 EventHandler* eh = ServerInstance->SE->GetRef(session->fd);
 790                 if (eh)
 791                 {
 792                         ServerInstance->SE->WantWrite(eh);
 793                 }
 794         }
 795
 796         virtual void OnBufferFlushed(User* user)
 797         {
 798                 if (user->GetIOHook() == this)
 799                 {
 800                         issl_session* session = &sessions[user->GetFd()];
 801                         if (session && session->outbuf.size())
 802                                 OnRawSocketWrite(user->GetFd(), NULL, 0);
 803                 }
 804         }
 805
 806         void CloseSession(issl_session* session)
 807         {
 808                 if (session->sess)
 809                 {
 810                         SSL_shutdown(session->sess);
 811                         SSL_free(session->sess);
 812                 }
 813
 814                 if (session->inbuf)
 815                 {
 816                         delete[] session->inbuf;
 817                 }
 818
 819                 session->outbuf.clear();
 820                 session->inbuf = NULL;
 821                 session->sess = NULL;
 822                 session->status = ISSL_NONE;
 823                 errno = EIO;
 824         }
 825
 826         ssl_cert* VerifyCertificate(issl_session* session, Extensible* user)
 827         {
 828                 if (!session->sess || !user)
 829                         return NULL;
 830
 831                 X509* cert;
 832                 ssl_cert* certinfo = new ssl_cert;
 833                 unsigned int n;
 834                 unsigned char md[EVP_MAX_MD_SIZE];
 835                 const EVP_MD *digest = EVP_md5();
 836
 837                 user->Extend("ssl_cert",certinfo);
 838
 839                 cert = SSL_get_peer_certificate((SSL*)session->sess);
 840
 841                 if (!cert)
 842                 {
 843                         certinfo->error = "Could not get peer certificate: "+std::string(get_error());
 844                         return certinfo;
 845                 }
 846
 847                 certinfo->invalid = (SSL_get_verify_result(session->sess) != X509_V_OK);
 848
 849                 if (SelfSigned)
 850                 {
 851                         certinfo->unknownsigner = false;
 852                         certinfo->trusted = true;
 853                 }
 854                 else
 855                 {
 856                         certinfo->unknownsigner = true;
 857                         certinfo->trusted = false;
 858                 }
 859
 860                 certinfo->dn = X509_NAME_oneline(X509_get_subject_name(cert),0,0);
 861                 certinfo->issuer = X509_NAME_oneline(X509_get_issuer_name(cert),0,0);
 862
 863                 if (!X509_digest(cert, digest, md, &n))
 864                 {
 865                         certinfo->error = "Out of memory generating fingerprint";
 866                 }
 867                 else
 868                 {
 869                         certinfo->fingerprint = irc::hex(md, n);
 870                 }
 871
 872                 if ((ASN1_UTCTIME_cmp_time_t(X509_get_notAfter(cert), ServerInstance->Time()) == -1) || (ASN1_UTCTIME_cmp_time_t(X509_get_notBefore(cert), ServerInstance->Time()) == 0))
 873                 {
 874                         certinfo->error = "Not activated, or expired certificate";
 875                 }
 876
 877                 X509_free(cert);
 878                 return certinfo;
 879         }
 880
 881         void Prioritize()
 882         {
 883                 Module* server = ServerInstance->Modules->Find("m_spanningtree.so");
 884                 ServerInstance->Modules->SetPriority(this, I_OnPostConnect, PRIORITY_AFTER, &server);
 885         }
 886
 887 };
 888
 889 static int error_callback(const char *str, size_t len, void *u)
 890 {
 891         ModuleSSLOpenSSL* mssl = (ModuleSSLOpenSSL*)u;
 892         mssl->PublicInstance->Logs->Log("m_ssl_openssl",DEFAULT, "SSL error: " + std::string(str, len - 1));
 893
 894         //
 895         // XXX: Remove this line, it causes valgrind warnings...
 896         //
 897         // MD_update(&m, buf, j);
 898         //
 899         //
 900         // ... ONLY JOKING! :-)
 901         //
 902
 903         return 0;
 904 }
 905
 906 MODULE_INIT(ModuleSSLOpenSSL)