src/modules/extra/m_ssl_openssl.cpp

   1 /*
   2  * InspIRCd -- Internet Relay Chat Daemon
   3  *
   4  *   Copyright (C) 2009-2010 Daniel De Graaf <danieldg@inspircd.org>
   5  *   Copyright (C) 2008 Pippijn van Steenhoven <pip88nl@gmail.com>
   6  *   Copyright (C) 2006-2008 Craig Edwards <craigedwards@brainbox.cc>
   7  *   Copyright (C) 2008 Thomas Stagner <aquanight@inspircd.org>
   8  *   Copyright (C) 2007 Dennis Friis <peavey@inspircd.org>
   9  *   Copyright (C) 2006 Oliver Lupton <oliverlupton@gmail.com>
  10  *
  11  * This file is part of InspIRCd.  InspIRCd is free software: you can
  12  * redistribute it and/or modify it under the terms of the GNU General Public
  13  * License as published by the Free Software Foundation, version 2.
  14  *
  15  * This program is distributed in the hope that it will be useful, but WITHOUT
  16  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  17  * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
  18  * details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  22  */
  23
  24  /* HACK: This prevents OpenSSL on OS X 10.7 and later from spewing deprecation
  25   * warnings for every single function call. As far as I (SaberUK) know, Apple
  26   * have no plans to remove OpenSSL so this warning just causes needless spam.
  27   */
  28 #ifdef __APPLE__
  29 # define __AVAILABILITYMACROS__
  30 # define DEPRECATED_IN_MAC_OS_X_VERSION_10_7_AND_LATER
  31 #endif
  32
  33 #include "inspircd.h"
  34 #include <openssl/ssl.h>
  35 #include <openssl/err.h>
  36 #include "ssl.h"
  37
  38 #ifdef _WIN32
  39 # pragma comment(lib, "ssleay32.lib")
  40 # pragma comment(lib, "libeay32.lib")
  41 # undef MAX_DESCRIPTORS
  42 # define MAX_DESCRIPTORS 10000
  43 #endif
  44
  45 /* $ModDesc: Provides SSL support for clients */
  46
  47 /* $LinkerFlags: if("USE_FREEBSD_BASE_SSL") -lssl -lcrypto */
  48 /* $CompileFlags: if(!"USE_FREEBSD_BASE_SSL") pkgconfversion("openssl","0.9.7") pkgconfincludes("openssl","/openssl/ssl.h","") */
  49 /* $LinkerFlags: if(!"USE_FREEBSD_BASE_SSL") rpath("pkg-config --libs openssl") pkgconflibs("openssl","/libssl.so","-lssl -lcrypto -ldl") */
  50
  51 /* $NoPedantic */
  52
  53
  54 enum issl_status { ISSL_NONE, ISSL_HANDSHAKING, ISSL_OPEN };
  55
  56 static bool SelfSigned = false;
  57
  58 char* get_error()
  59 {
  60         return ERR_error_string(ERR_get_error(), NULL);
  61 }
  62
  63 static int error_callback(const char *str, size_t len, void *u);
  64
  65 /** Represents an SSL user's extra data
  66  */
  67 class issl_session
  68 {
  69 public:
  70         SSL* sess;
  71         issl_status status;
  72         reference<ssl_cert> cert;
  73
  74         bool outbound;
  75         bool data_to_write;
  76
  77         issl_session()
  78         {
  79                 outbound = false;
  80                 data_to_write = false;
  81         }
  82 };
  83
  84 static int OnVerify(int preverify_ok, X509_STORE_CTX *ctx)
  85 {
  86         /* XXX: This will allow self signed certificates.
  87          * In the future if we want an option to not allow this,
  88          * we can just return preverify_ok here, and openssl
  89          * will boot off self-signed and invalid peer certs.
  90          */
  91         int ve = X509_STORE_CTX_get_error(ctx);
  92
  93         SelfSigned = (ve == X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT);
  94
  95         return 1;
  96 }
  97
  98 class ModuleSSLOpenSSL : public Module
  99 {
 100         issl_session* sessions;
 101
 102         SSL_CTX* ctx;
 103         SSL_CTX* clictx;
 104
 105         std::string sslports;
 106         bool use_sha;
 107
 108         ServiceProvider iohook;
 109  public:
 110
 111         ModuleSSLOpenSSL() : iohook(this, "ssl/openssl", SERVICE_IOHOOK)
 112         {
 113                 sessions = new issl_session[ServerInstance->SE->GetMaxFds()];
 114
 115                 /* Global SSL library initialization*/
 116                 SSL_library_init();
 117                 SSL_load_error_strings();
 118
 119                 /* Build our SSL contexts:
 120                  * NOTE: OpenSSL makes us have two contexts, one for servers and one for clients. ICK.
 121                  */
 122                 ctx = SSL_CTX_new( SSLv23_server_method() );
 123                 clictx = SSL_CTX_new( SSLv23_client_method() );
 124
 125                 SSL_CTX_set_mode(ctx, SSL_MODE_ENABLE_PARTIAL_WRITE | SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER);
 126                 SSL_CTX_set_mode(clictx, SSL_MODE_ENABLE_PARTIAL_WRITE | SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER);
 127
 128                 SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER | SSL_VERIFY_CLIENT_ONCE, OnVerify);
 129                 SSL_CTX_set_verify(clictx, SSL_VERIFY_PEER | SSL_VERIFY_CLIENT_ONCE, OnVerify);
 130
 131                 const unsigned char session_id[] = "inspircd";
 132                 SSL_CTX_set_session_id_context(ctx, session_id, sizeof(session_id) - 1);
 133         }
 134
 135         void init()
 136         {
 137                 // Needs the flag as it ignores a plain /rehash
 138                 OnModuleRehash(NULL,"ssl");
 139                 Implementation eventlist[] = { I_On005Numeric, I_OnRehash, I_OnModuleRehash, I_OnHookIO, I_OnUserConnect };
 140                 ServerInstance->Modules->Attach(eventlist, this, sizeof(eventlist)/sizeof(Implementation));
 141                 ServerInstance->Modules->AddService(iohook);
 142         }
 143
 144         void OnHookIO(StreamSocket* user, ListenSocket* lsb)
 145         {
 146                 if (!user->GetIOHook() && lsb->bind_tag->getString("ssl") == "openssl")
 147                 {
 148                         /* Hook the user with our module */
 149                         user->AddIOHook(this);
 150                 }
 151         }
 152
 153         void OnRehash(User* user)
 154         {
 155                 sslports.clear();
 156
 157                 ConfigTag* Conf = ServerInstance->Config->ConfValue("openssl");
 158
 159                 if (Conf->getBool("showports", true))
 160                 {
 161                         sslports = Conf->getString("advertisedports");
 162                         if (!sslports.empty())
 163                                 return;
 164
 165                         for (size_t i = 0; i < ServerInstance->ports.size(); i++)
 166                         {
 167                                 ListenSocket* port = ServerInstance->ports[i];
 168                                 if (port->bind_tag->getString("ssl") != "openssl")
 169                                         continue;
 170
 171                                 const std::string& portid = port->bind_desc;
 172                                 ServerInstance->Logs->Log("m_ssl_openssl", DEFAULT, "m_ssl_openssl.so: Enabling SSL for port %s", portid.c_str());
 173
 174                                 if (port->bind_tag->getString("type", "clients") == "clients" && port->bind_addr != "127.0.0.1")
 175                                 {
 176                                         /*
 177                                          * Found an SSL port for clients that is not bound to 127.0.0.1 and handled by us, display
 178                                          * the IP:port in ISUPPORT.
 179                                          *
 180                                          * We used to advertise all ports seperated by a ';' char that matched the above criteria,
 181                                          * but this resulted in too long ISUPPORT lines if there were lots of ports to be displayed.
 182                                          * To solve this by default we now only display the first IP:port found and let the user
 183                                          * configure the exact value for the 005 token, if necessary.
 184                                          */
 185                                         sslports = portid;
 186                                         break;
 187                                 }
 188                         }
 189                 }
 190         }
 191
 192         void OnModuleRehash(User* user, const std::string &param)
 193         {
 194                 if (param != "ssl")
 195                         return;
 196
 197                 std::string keyfile;
 198                 std::string certfile;
 199                 std::string cafile;
 200                 std::string dhfile;
 201                 OnRehash(user);
 202
 203                 ConfigTag* conf = ServerInstance->Config->ConfValue("openssl");
 204
 205                 cafile   = conf->getString("cafile", CONFIG_PATH "/ca.pem");
 206                 certfile = conf->getString("certfile", CONFIG_PATH "/cert.pem");
 207                 keyfile  = conf->getString("keyfile", CONFIG_PATH "/key.pem");
 208                 dhfile   = conf->getString("dhfile", CONFIG_PATH "/dhparams.pem");
 209                 std::string hash = conf->getString("hash", "md5");
 210                 if (hash != "sha1" && hash != "md5")
 211                         throw ModuleException("Unknown hash type " + hash);
 212                 use_sha = (hash == "sha1");
 213
 214                 std::string ciphers = conf->getString("ciphers", "");
 215
 216                 if (!ciphers.empty())
 217                 {
 218                         if ((!SSL_CTX_set_cipher_list(ctx, ciphers.c_str())) || (!SSL_CTX_set_cipher_list(clictx, ciphers.c_str())))
 219                         {
 220                                 ServerInstance->Logs->Log("m_ssl_openssl",DEFAULT, "m_ssl_openssl.so: Can't set cipher list to %s.", ciphers.c_str());
 221                                 ERR_print_errors_cb(error_callback, this);
 222                         }
 223                 }
 224
 225                 /* Load our keys and certificates
 226                  * NOTE: OpenSSL's error logging API sucks, don't blame us for this clusterfuck.
 227                  */
 228                 if ((!SSL_CTX_use_certificate_chain_file(ctx, certfile.c_str())) || (!SSL_CTX_use_certificate_chain_file(clictx, certfile.c_str())))
 229                 {
 230                         ServerInstance->Logs->Log("m_ssl_openssl",DEFAULT, "m_ssl_openssl.so: Can't read certificate file %s. %s", certfile.c_str(), strerror(errno));
 231                         ERR_print_errors_cb(error_callback, this);
 232                 }
 233
 234                 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)))
 235                 {
 236                         ServerInstance->Logs->Log("m_ssl_openssl",DEFAULT, "m_ssl_openssl.so: Can't read key file %s. %s", keyfile.c_str(), strerror(errno));
 237                         ERR_print_errors_cb(error_callback, this);
 238                 }
 239
 240                 /* Load the CAs we trust*/
 241                 if (((!SSL_CTX_load_verify_locations(ctx, cafile.c_str(), 0))) || (!SSL_CTX_load_verify_locations(clictx, cafile.c_str(), 0)))
 242                 {
 243                         ServerInstance->Logs->Log("m_ssl_openssl",DEFAULT, "m_ssl_openssl.so: Can't read CA list from %s. This is only a problem if you want to verify client certificates, otherwise it's safe to ignore this message. Error: %s", cafile.c_str(), strerror(errno));
 244                         ERR_print_errors_cb(error_callback, this);
 245                 }
 246
 247 #ifdef _WIN32
 248                 BIO* dhpfile = BIO_new_file(dhfile.c_str(), "r");
 249 #else
 250                 FILE* dhpfile = fopen(dhfile.c_str(), "r");
 251 #endif
 252                 DH* ret;
 253
 254                 if (dhpfile == NULL)
 255                 {
 256                         ServerInstance->Logs->Log("m_ssl_openssl",DEFAULT, "m_ssl_openssl.so Couldn't open DH file %s: %s", dhfile.c_str(), strerror(errno));
 257                         throw ModuleException("Couldn't open DH file " + dhfile + ": " + strerror(errno));
 258                 }
 259                 else
 260                 {
 261 #ifdef _WIN32
 262                         ret = PEM_read_bio_DHparams(dhpfile, NULL, NULL, NULL);
 263                         BIO_free(dhpfile);
 264 #else
 265                         ret = PEM_read_DHparams(dhpfile, NULL, NULL, NULL);
 266 #endif
 267                         if ((SSL_CTX_set_tmp_dh(ctx, ret) < 0) || (SSL_CTX_set_tmp_dh(clictx, ret) < 0))
 268                         {
 269                                 ServerInstance->Logs->Log("m_ssl_openssl",DEFAULT, "m_ssl_openssl.so: Couldn't set DH parameters %s. SSL errors follow:", dhfile.c_str());
 270                                 ERR_print_errors_cb(error_callback, this);
 271                         }
 272                         DH_free(ret);
 273                 }
 274
 275 #ifndef _WIN32
 276                 fclose(dhpfile);
 277 #endif
 278         }
 279
 280         void On005Numeric(std::string &output)
 281         {
 282                 if (!sslports.empty())
 283                         output.append(" SSL=" + sslports);
 284         }
 285
 286         ~ModuleSSLOpenSSL()
 287         {
 288                 SSL_CTX_free(ctx);
 289                 SSL_CTX_free(clictx);
 290                 delete[] sessions;
 291         }
 292
 293         void OnUserConnect(LocalUser* user)
 294         {
 295                 if (user->eh.GetIOHook() == this)
 296                 {
 297                         if (sessions[user->eh.GetFd()].sess)
 298                         {
 299                                 if (!sessions[user->eh.GetFd()].cert->fingerprint.empty())
 300                                         user->WriteServ("NOTICE %s :*** You are connected using SSL cipher \"%s\""
 301                                                 " and your SSL fingerprint is %s", user->nick.c_str(), SSL_get_cipher(sessions[user->eh.GetFd()].sess), sessions[user->eh.GetFd()].cert->fingerprint.c_str());
 302                                 else
 303                                         user->WriteServ("NOTICE %s :*** You are connected using SSL cipher \"%s\"", user->nick.c_str(), SSL_get_cipher(sessions[user->eh.GetFd()].sess));
 304                         }
 305                 }
 306         }
 307
 308         void OnCleanup(int target_type, void* item)
 309         {
 310                 if (target_type == TYPE_USER)
 311                 {
 312                         LocalUser* user = IS_LOCAL((User*)item);
 313
 314                         if (user && user->eh.GetIOHook() == this)
 315                         {
 316                                 // User is using SSL, they're a local user, and they're using one of *our* SSL ports.
 317                                 // Potentially there could be multiple SSL modules loaded at once on different ports.
 318                                 ServerInstance->Users->QuitUser(user, "SSL module unloading");
 319                         }
 320                 }
 321         }
 322
 323         Version GetVersion()
 324         {
 325                 return Version("Provides SSL support for clients", VF_VENDOR);
 326         }
 327
 328         void OnRequest(Request& request)
 329         {
 330                 if (strcmp("GET_SSL_CERT", request.id) == 0)
 331                 {
 332                         SocketCertificateRequest& req = static_cast<SocketCertificateRequest&>(request);
 333                         int fd = req.sock->GetFd();
 334                         issl_session* session = &sessions[fd];
 335
 336                         req.cert = session->cert;
 337                 }
 338         }
 339
 340         void OnStreamSocketAccept(StreamSocket* user, irc::sockets::sockaddrs* client, irc::sockets::sockaddrs* server)
 341         {
 342                 int fd = user->GetFd();
 343
 344                 issl_session* session = &sessions[fd];
 345
 346                 session->sess = SSL_new(ctx);
 347                 session->status = ISSL_NONE;
 348                 session->outbound = false;
 349                 session->cert = NULL;
 350
 351                 if (session->sess == NULL)
 352                         return;
 353
 354                 if (SSL_set_fd(session->sess, fd) == 0)
 355                 {
 356                         ServerInstance->Logs->Log("m_ssl_openssl",DEBUG,"BUG: Can't set fd with SSL_set_fd: %d", fd);
 357                         return;
 358                 }
 359
 360                 Handshake(user, session);
 361         }
 362
 363         void OnStreamSocketConnect(StreamSocket* user)
 364         {
 365                 int fd = user->GetFd();
 366                 /* Are there any possibilities of an out of range fd? Hope not, but lets be paranoid */
 367                 if ((fd < 0) || (fd > ServerInstance->SE->GetMaxFds() -1))
 368                         return;
 369
 370                 issl_session* session = &sessions[fd];
 371
 372                 session->sess = SSL_new(clictx);
 373                 session->status = ISSL_NONE;
 374                 session->outbound = true;
 375
 376                 if (session->sess == NULL)
 377                         return;
 378
 379                 if (SSL_set_fd(session->sess, fd) == 0)
 380                 {
 381                         ServerInstance->Logs->Log("m_ssl_openssl",DEBUG,"BUG: Can't set fd with SSL_set_fd: %d", fd);
 382                         return;
 383                 }
 384
 385                 Handshake(user, session);
 386         }
 387
 388         void OnStreamSocketClose(StreamSocket* user)
 389         {
 390                 int fd = user->GetFd();
 391                 /* Are there any possibilities of an out of range fd? Hope not, but lets be paranoid */
 392                 if ((fd < 0) || (fd > ServerInstance->SE->GetMaxFds() - 1))
 393                         return;
 394
 395                 CloseSession(&sessions[fd]);
 396         }
 397
 398         int OnStreamSocketRead(StreamSocket* user, std::string& recvq)
 399         {
 400                 int fd = user->GetFd();
 401                 /* Are there any possibilities of an out of range fd? Hope not, but lets be paranoid */
 402                 if ((fd < 0) || (fd > ServerInstance->SE->GetMaxFds() - 1))
 403                         return -1;
 404
 405                 issl_session* session = &sessions[fd];
 406
 407                 if (!session->sess)
 408                 {
 409                         CloseSession(session);
 410                         return -1;
 411                 }
 412
 413                 if (session->status == ISSL_HANDSHAKING)
 414                 {
 415                         // The handshake isn't finished and it wants to read, try to finish it.
 416                         if (!Handshake(user, session))
 417                         {
 418                                 // Couldn't resume handshake.
 419                                 if (session->status == ISSL_NONE)
 420                                         return -1;
 421                                 return 0;
 422                         }
 423                 }
 424
 425                 // If we resumed the handshake then session->status will be ISSL_OPEN
 426
 427                 if (session->status == ISSL_OPEN)
 428                 {
 429                         char* buffer = ServerInstance->GetReadBuffer();
 430                         size_t bufsiz = ServerInstance->Config->NetBufferSize;
 431                         int ret = SSL_read(session->sess, buffer, bufsiz);
 432
 433                         if (ret > 0)
 434                         {
 435                                 recvq.append(buffer, ret);
 436                                 if (session->data_to_write)
 437                                         ServerInstance->SE->ChangeEventMask(user, FD_WANT_POLL_READ | FD_WANT_SINGLE_WRITE);
 438                                 return 1;
 439                         }
 440                         else if (ret == 0)
 441                         {
 442                                 // Client closed connection.
 443                                 CloseSession(session);
 444                                 user->SetError("Connection closed");
 445                                 return -1;
 446                         }
 447                         else if (ret < 0)
 448                         {
 449                                 int err = SSL_get_error(session->sess, ret);
 450
 451                                 if (err == SSL_ERROR_WANT_READ)
 452                                 {
 453                                         ServerInstance->SE->ChangeEventMask(user, FD_WANT_POLL_READ);
 454                                         return 0;
 455                                 }
 456                                 else if (err == SSL_ERROR_WANT_WRITE)
 457                                 {
 458                                         ServerInstance->SE->ChangeEventMask(user, FD_WANT_NO_READ | FD_WANT_SINGLE_WRITE);
 459                                         return 0;
 460                                 }
 461                                 else
 462                                 {
 463                                         CloseSession(session);
 464                                         return -1;
 465                                 }
 466                         }
 467                 }
 468
 469                 return 0;
 470         }
 471
 472         int OnStreamSocketWrite(StreamSocket* user, std::string& buffer)
 473         {
 474                 int fd = user->GetFd();
 475
 476                 issl_session* session = &sessions[fd];
 477
 478                 if (!session->sess)
 479                 {
 480                         CloseSession(session);
 481                         return -1;
 482                 }
 483
 484                 session->data_to_write = true;
 485
 486                 if (session->status == ISSL_HANDSHAKING)
 487                 {
 488                         if (!Handshake(user, session))
 489                         {
 490                                 // Couldn't resume handshake.
 491                                 if (session->status == ISSL_NONE)
 492                                         return -1;
 493                                 return 0;
 494                         }
 495                 }
 496
 497                 if (session->status == ISSL_OPEN)
 498                 {
 499                         int ret = SSL_write(session->sess, buffer.data(), buffer.size());
 500                         if (ret == (int)buffer.length())
 501                         {
 502                                 session->data_to_write = false;
 503                                 ServerInstance->SE->ChangeEventMask(user, FD_WANT_POLL_READ | FD_WANT_NO_WRITE);
 504                                 return 1;
 505                         }
 506                         else if (ret > 0)
 507                         {
 508                                 buffer = buffer.substr(ret);
 509                                 ServerInstance->SE->ChangeEventMask(user, FD_WANT_SINGLE_WRITE);
 510                                 return 0;
 511                         }
 512                         else if (ret == 0)
 513                         {
 514                                 CloseSession(session);
 515                                 return -1;
 516                         }
 517                         else if (ret < 0)
 518                         {
 519                                 int err = SSL_get_error(session->sess, ret);
 520
 521                                 if (err == SSL_ERROR_WANT_WRITE)
 522                                 {
 523                                         ServerInstance->SE->ChangeEventMask(user, FD_WANT_SINGLE_WRITE);
 524                                         return 0;
 525                                 }
 526                                 else if (err == SSL_ERROR_WANT_READ)
 527                                 {
 528                                         ServerInstance->SE->ChangeEventMask(user, FD_WANT_POLL_READ);
 529                                         return 0;
 530                                 }
 531                                 else
 532                                 {
 533                                         CloseSession(session);
 534                                         return -1;
 535                                 }
 536                         }
 537                 }
 538                 return 0;
 539         }
 540
 541         bool Handshake(StreamSocket* user, issl_session* session)
 542         {
 543                 int ret;
 544
 545                 if (session->outbound)
 546                         ret = SSL_connect(session->sess);
 547                 else
 548                         ret = SSL_accept(session->sess);
 549
 550                 if (ret < 0)
 551                 {
 552                         int err = SSL_get_error(session->sess, ret);
 553
 554                         if (err == SSL_ERROR_WANT_READ)
 555                         {
 556                                 ServerInstance->SE->ChangeEventMask(user, FD_WANT_POLL_READ | FD_WANT_NO_WRITE);
 557                                 session->status = ISSL_HANDSHAKING;
 558                                 return true;
 559                         }
 560                         else if (err == SSL_ERROR_WANT_WRITE)
 561                         {
 562                                 ServerInstance->SE->ChangeEventMask(user, FD_WANT_NO_READ | FD_WANT_SINGLE_WRITE);
 563                                 session->status = ISSL_HANDSHAKING;
 564                                 return true;
 565                         }
 566                         else
 567                         {
 568                                 CloseSession(session);
 569                         }
 570
 571                         return false;
 572                 }
 573                 else if (ret > 0)
 574                 {
 575                         // Handshake complete.
 576                         VerifyCertificate(session, user);
 577
 578                         session->status = ISSL_OPEN;
 579
 580                         ServerInstance->SE->ChangeEventMask(user, FD_WANT_POLL_READ | FD_WANT_NO_WRITE | FD_ADD_TRIAL_WRITE);
 581
 582                         return true;
 583                 }
 584                 else if (ret == 0)
 585                 {
 586                         CloseSession(session);
 587                         return true;
 588                 }
 589
 590                 return true;
 591         }
 592
 593         void CloseSession(issl_session* session)
 594         {
 595                 if (session->sess)
 596                 {
 597                         SSL_shutdown(session->sess);
 598                         SSL_free(session->sess);
 599                 }
 600
 601                 session->sess = NULL;
 602                 session->status = ISSL_NONE;
 603                 errno = EIO;
 604         }
 605
 606         void VerifyCertificate(issl_session* session, StreamSocket* user)
 607         {
 608                 if (!session->sess || !user)
 609                         return;
 610
 611                 X509* cert;
 612                 ssl_cert* certinfo = new ssl_cert;
 613                 session->cert = certinfo;
 614                 unsigned int n;
 615                 unsigned char md[EVP_MAX_MD_SIZE];
 616                 const EVP_MD *digest = use_sha ? EVP_sha1() : EVP_md5();
 617
 618                 cert = SSL_get_peer_certificate((SSL*)session->sess);
 619
 620                 if (!cert)
 621                 {
 622                         certinfo->error = "Could not get peer certificate: "+std::string(get_error());
 623                         return;
 624                 }
 625
 626                 certinfo->invalid = (SSL_get_verify_result(session->sess) != X509_V_OK);
 627
 628                 if (!SelfSigned)
 629                 {
 630                         certinfo->unknownsigner = false;
 631                         certinfo->trusted = true;
 632                 }
 633                 else
 634                 {
 635                         certinfo->unknownsigner = true;
 636                         certinfo->trusted = false;
 637                 }
 638
 639                 char buf[512];
 640                 X509_NAME_oneline(X509_get_subject_name(cert), buf, sizeof(buf));
 641                 certinfo->dn = buf;
 642                 X509_NAME_oneline(X509_get_issuer_name(cert), buf, sizeof(buf));
 643                 certinfo->issuer = buf;
 644
 645                 if (!X509_digest(cert, digest, md, &n))
 646                 {
 647                         certinfo->error = "Out of memory generating fingerprint";
 648                 }
 649                 else
 650                 {
 651                         certinfo->fingerprint = irc::hex(md, n);
 652                 }
 653
 654                 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))
 655                 {
 656                         certinfo->error = "Not activated, or expired certificate";
 657                 }
 658
 659                 X509_free(cert);
 660         }
 661 };
 662
 663 static int error_callback(const char *str, size_t len, void *u)
 664 {
 665         ServerInstance->Logs->Log("m_ssl_openssl",DEFAULT, "SSL error: " + std::string(str, len - 1));
 666
 667         //
 668         // XXX: Remove this line, it causes valgrind warnings...
 669         //
 670         // MD_update(&m, buf, j);
 671         //
 672         //
 673         // ... ONLY JOKING! :-)
 674         //
 675
 676         return 0;
 677 }
 678
 679 MODULE_INIT(ModuleSSLOpenSSL)