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