src/ngircd/conn-ssl.c

   1 /*
   2  * ngIRCd -- The Next Generation IRC Daemon
   3  * Copyright (c) 2005-2008 Florian Westphal <fw@strlen.de>
   4  */
   5
   6 #include "portab.h"
   7
   8 /**
   9  * @file
  10  * SSL wrapper functions
  11  */
  12
  13 #include "imp.h"
  14 #include "conf-ssl.h"
  15
  16 #ifdef SSL_SUPPORT
  17
  18 #include "io.h"
  19 #include <assert.h>
  20 #include <stdio.h>
  21 #include <string.h>
  22 #include <stdlib.h>
  23 #include <errno.h>
  24
  25 #define CONN_MODULE
  26 #include "conn.h"
  27 #include "conf.h"
  28 #include "conn-func.h"
  29 #include "conn-ssl.h"
  30 #include "log.h"
  31
  32 #include "exp.h"
  33 #include "defines.h"
  34
  35 extern struct SSLOptions Conf_SSLOptions;
  36
  37 #ifdef HAVE_LIBSSL
  38 #include <openssl/err.h>
  39 #include <openssl/rand.h>
  40
  41 static SSL_CTX * ssl_ctx;
  42 static DH *dh_params;
  43
  44 static bool ConnSSL_LoadServerKey_openssl PARAMS(( SSL_CTX *c ));
  45 #endif
  46
  47 #ifdef HAVE_LIBGNUTLS
  48 #include <sys/types.h>
  49 #include <sys/stat.h>
  50 #include <fcntl.h>
  51 #include <unistd.h>
  52 #include <gnutls/x509.h>
  53
  54 #define DH_BITS 2048
  55 #define DH_BITS_MIN 1024
  56
  57 static gnutls_certificate_credentials_t x509_cred;
  58 static gnutls_dh_params_t dh_params;
  59 static bool ConnSSL_LoadServerKey_gnutls PARAMS(( void ));
  60 #endif
  61
  62 static bool ConnSSL_Init_SSL PARAMS(( CONNECTION *c ));
  63 static int ConnectAccept PARAMS(( CONNECTION *c, bool connect ));
  64 static int ConnSSL_HandleError PARAMS(( CONNECTION *c, const int code, const char *fname ));
  65
  66 #ifdef HAVE_LIBGNUTLS
  67 static char * openreadclose(const char *name, size_t *len)
  68 {
  69         char *buf = NULL;
  70         struct stat s;
  71         ssize_t br;
  72         int fd = open(name, O_RDONLY);
  73         if (fd < 0) {
  74                 Log(LOG_ERR, "Could not open %s: %s", name, strerror(errno));
  75                 return NULL;
  76         }
  77         if (fstat(fd, &s)) {
  78                 Log(LOG_ERR, "Could not fstat %s: %s", name, strerror(errno));
  79                 goto out;
  80         }
  81         if (!S_ISREG(s.st_mode)) {
  82                 Log(LOG_ERR, "%s: Not a regular file", name);
  83                 goto out;
  84         }
  85         if (s.st_size <= 0) {
  86                 Log(LOG_ERR, "%s: invalid file length (size %ld <= 0)", name, (long) s.st_size);
  87                 goto out;
  88         }
  89         buf = malloc(s.st_size);
  90         if (!buf) {
  91                 Log(LOG_ERR, "Could not malloc %lu bytes for file %s: %s", s.st_size, name, strerror(errno));
  92                 goto out;
  93         }
  94         br = read(fd, buf, s.st_size);
  95         if (br != (ssize_t)s.st_size) {
  96                 Log(LOG_ERR, "Could not read file %s: read returned %ld, expected %ld: %s",
  97                         name, (long) br, (long) s.st_size, br == -1 ? strerror(errno):"short read?!");
  98                 memset(buf, 0, s.st_size);
  99                 free(buf);
 100                 buf = NULL;
 101         } else {
 102                 *len = br;
 103         }
 104 out:
 105         close(fd);
 106         return buf;
 107 }
 108 #endif
 109
 110
 111 #ifdef HAVE_LIBSSL
 112 static void
 113 LogOpenSSLError( const char *msg, const char *msg2 )
 114 {
 115         unsigned long err = ERR_get_error();
 116         char * errmsg = err ? ERR_error_string(err, NULL) : "Unable to determine error";
 117
 118         if (!msg) msg = "SSL Error";
 119         if (msg2)
 120                 Log( LOG_ERR, "%s: %s: %s", msg, msg2, errmsg);
 121         else
 122                 Log( LOG_ERR, "%s: %s", msg, errmsg);
 123 }
 124
 125
 126 static int
 127 pem_passwd_cb(char *buf, int size, int rwflag, void *password)
 128 {
 129         array *pass = password;
 130         int passlen;
 131
 132         (void)rwflag;           /* rwflag is unused if DEBUG is not set. */
 133         assert(rwflag == 0);    /* 0 -> callback used for decryption.
 134                                  * See SSL_CTX_set_default_passwd_cb(3) */
 135
 136         passlen = (int) array_bytes(pass);
 137
 138         LogDebug("pem_passwd_cb buf size %d, array size %d", size, passlen);
 139         assert(passlen >= 0);
 140         if (passlen <= 0) {
 141                 Log(LOG_ERR, "pem_passwd_cb: password required, but not set");
 142                 return 0;
 143         }
 144         size = passlen > size ? size : passlen;
 145         memcpy(buf, (char *)(array_start(pass)), size);
 146         return size;
 147 }
 148 #endif
 149
 150
 151 static bool
 152 Load_DH_params(void)
 153 {
 154 #ifdef HAVE_LIBSSL
 155         FILE *fp;
 156         bool ret = true;
 157
 158         if (!Conf_SSLOptions.DHFile) {
 159                 Log(LOG_NOTICE, "Configuration option \"DHFile\" not set!");
 160                 return false;
 161         }
 162         fp = fopen(Conf_SSLOptions.DHFile, "r");
 163         if (!fp) {
 164                 Log(LOG_ERR, "%s: %s", Conf_SSLOptions.DHFile, strerror(errno));
 165                 return false;
 166         }
 167         dh_params = PEM_read_DHparams(fp, NULL, NULL, NULL);
 168         if (!dh_params) {
 169                 Log(LOG_ERR, "%s: PEM_read_DHparams failed!",
 170                     Conf_SSLOptions.DHFile);
 171                 ret = false;
 172         }
 173         fclose(fp);
 174         return ret;
 175 #endif
 176 #ifdef HAVE_LIBGNUTLS
 177         bool need_dhgenerate = true;
 178         int err;
 179         gnutls_dh_params_t tmp_dh_params;
 180
 181         err = gnutls_dh_params_init(&tmp_dh_params);
 182         if (err < 0) {
 183                 Log(LOG_ERR, "gnutls_dh_params_init: %s", gnutls_strerror(err));
 184                 return false;
 185         }
 186         if (Conf_SSLOptions.DHFile) {
 187                 gnutls_datum_t dhparms;
 188                 size_t size;
 189                 dhparms.data = (unsigned char *) openreadclose(Conf_SSLOptions.DHFile, &size);
 190                 if (dhparms.data) {
 191                         dhparms.size = size;
 192                         err = gnutls_dh_params_import_pkcs3(tmp_dh_params, &dhparms, GNUTLS_X509_FMT_PEM);
 193                         if (err == 0)
 194                                 need_dhgenerate = false;
 195                         else
 196                                 Log(LOG_ERR, "gnutls_dh_params_init: %s", gnutls_strerror(err));
 197
 198                         memset(dhparms.data, 0, size);
 199                         free(dhparms.data);
 200                 }
 201         }
 202         if (need_dhgenerate) {
 203                 Log(LOG_WARNING,
 204                     "DHFile not set, generating %u bit DH parameters. This may take a while ...",
 205                     DH_BITS);
 206                 err = gnutls_dh_params_generate2(tmp_dh_params, DH_BITS);
 207                 if (err < 0) {
 208                         Log(LOG_ERR, "gnutls_dh_params_generate2: %s", gnutls_strerror(err));
 209                         return false;
 210                 }
 211         }
 212         dh_params = tmp_dh_params;
 213         return true;
 214 #endif
 215 }
 216
 217
 218 void ConnSSL_Free(CONNECTION *c)
 219 {
 220 #ifdef HAVE_LIBSSL
 221         SSL *ssl = c->ssl_state.ssl;
 222         if (ssl) {
 223                 SSL_shutdown(ssl);
 224                 SSL_free(ssl);
 225                 c->ssl_state.ssl = NULL;
 226         }
 227 #endif
 228 #ifdef HAVE_LIBGNUTLS
 229         gnutls_session_t sess = c->ssl_state.gnutls_session;
 230         if (Conn_OPTION_ISSET(c, CONN_SSL)) {
 231                 gnutls_bye(sess, GNUTLS_SHUT_RDWR);
 232                 gnutls_deinit(sess);
 233         }
 234 #endif
 235         assert(Conn_OPTION_ISSET(c, CONN_SSL));
 236         /* can't just set bitmask to 0 -- there are other, non-ssl related flags, e.g. CONN_ZIP. */
 237         Conn_OPTION_DEL(c, CONN_SSL_FLAGS_ALL);
 238 }
 239
 240
 241 bool
 242 ConnSSL_InitLibrary( void )
 243 {
 244         if (!Conf_SSLInUse()) {
 245                 LogDebug("SSL not in use, skipping initialization.");
 246                 return true;
 247         }
 248
 249 #ifdef HAVE_LIBSSL
 250         SSL_CTX *newctx;
 251
 252         if (!ssl_ctx) {
 253                 SSL_library_init();
 254                 SSL_load_error_strings();
 255         }
 256
 257         if (!RAND_status()) {
 258                 Log(LOG_ERR, "OpenSSL PRNG not seeded: /dev/urandom missing?");
 259                 /*
 260                  * it is probably best to fail and let the user install EGD or a similar program if no kernel random device is available.
 261                  * According to OpenSSL RAND_egd(3): "The automatic query of /var/run/egd-pool et al was added in OpenSSL 0.9.7";
 262                  * so it makes little sense to deal with PRNGD seeding ourselves.
 263                  */
 264                 array_free(&Conf_SSLOptions.ListenPorts);
 265                 return false;
 266         }
 267
 268         newctx = SSL_CTX_new(SSLv23_method());
 269         if (!newctx) {
 270                 LogOpenSSLError("SSL_CTX_new()", NULL);
 271                 array_free(&Conf_SSLOptions.ListenPorts);
 272                 return false;
 273         }
 274
 275         if (!ConnSSL_LoadServerKey_openssl(newctx))
 276                 goto out;
 277
 278         SSL_CTX_set_options(newctx, SSL_OP_SINGLE_DH_USE|SSL_OP_NO_SSLv2);
 279         SSL_CTX_set_mode(newctx, SSL_MODE_ENABLE_PARTIAL_WRITE);
 280         SSL_CTX_free(ssl_ctx);
 281         ssl_ctx = newctx;
 282         Log(LOG_INFO, "%s initialized.", SSLeay_version(SSLEAY_VERSION));
 283         return true;
 284 out:
 285         SSL_CTX_free(newctx);
 286         array_free(&Conf_SSLOptions.ListenPorts);
 287         return false;
 288 #endif
 289 #ifdef HAVE_LIBGNUTLS
 290         int err;
 291         static bool initialized;
 292         if (initialized) /* TODO: cannot reload gnutls keys: can't simply free x509 context -- it may still be in use */
 293                 return false;
 294
 295         err = gnutls_global_init();
 296         if (err) {
 297                 Log(LOG_ERR, "gnutls_global_init(): %s", gnutls_strerror(err));
 298                 array_free(&Conf_SSLOptions.ListenPorts);
 299                 return false;
 300         }
 301         if (!ConnSSL_LoadServerKey_gnutls()) {
 302                 array_free(&Conf_SSLOptions.ListenPorts);
 303                 return false;
 304         }
 305         Log(LOG_INFO, "gnutls %s initialized.", gnutls_check_version(NULL));
 306         initialized = true;
 307         return true;
 308 #endif
 309 }
 310
 311
 312 #ifdef HAVE_LIBGNUTLS
 313 static bool
 314 ConnSSL_LoadServerKey_gnutls(void)
 315 {
 316         int err;
 317         const char *cert_file;
 318
 319         err = gnutls_certificate_allocate_credentials(&x509_cred);
 320         if (err < 0) {
 321                 Log(LOG_ERR, "gnutls_certificate_allocate_credentials: %s", gnutls_strerror(err));
 322                 return false;
 323         }
 324
 325         cert_file = Conf_SSLOptions.CertFile ? Conf_SSLOptions.CertFile:Conf_SSLOptions.KeyFile;
 326         if (!cert_file) {
 327                 Log(LOG_ERR, "No SSL server key configured!");
 328                 return false;
 329         }
 330
 331         if (array_bytes(&Conf_SSLOptions.KeyFilePassword))
 332                 Log(LOG_WARNING,
 333                     "Ignoring KeyFilePassword: Not supported by GNUTLS.");
 334
 335         if (!Load_DH_params())
 336                 return false;
 337
 338         gnutls_certificate_set_dh_params(x509_cred, dh_params);
 339         err = gnutls_certificate_set_x509_key_file(x509_cred, cert_file, Conf_SSLOptions.KeyFile, GNUTLS_X509_FMT_PEM);
 340         if (err < 0) {
 341                 Log(LOG_ERR, "gnutls_certificate_set_x509_key_file (cert %s, key %s): %s",
 342                                 cert_file, Conf_SSLOptions.KeyFile ? Conf_SSLOptions.KeyFile : "(NULL)", gnutls_strerror(err));
 343                 return false;
 344         }
 345         return true;
 346 }
 347 #endif
 348
 349
 350 #ifdef HAVE_LIBSSL
 351 static bool
 352 ConnSSL_LoadServerKey_openssl(SSL_CTX *ctx)
 353 {
 354         char *cert_key;
 355
 356         assert(ctx);
 357         if (!Conf_SSLOptions.KeyFile) {
 358                 Log(LOG_ERR, "No SSL server key configured!");
 359                 return false;
 360         }
 361
 362         SSL_CTX_set_default_passwd_cb(ctx, pem_passwd_cb);
 363         SSL_CTX_set_default_passwd_cb_userdata(ctx, &Conf_SSLOptions.KeyFilePassword);
 364
 365         if (SSL_CTX_use_PrivateKey_file(ctx, Conf_SSLOptions.KeyFile, SSL_FILETYPE_PEM) != 1) {
 366                 array_free_wipe(&Conf_SSLOptions.KeyFilePassword);
 367                 LogOpenSSLError("SSL_CTX_use_PrivateKey_file",  Conf_SSLOptions.KeyFile);
 368                 return false;
 369         }
 370
 371         cert_key = Conf_SSLOptions.CertFile ? Conf_SSLOptions.CertFile:Conf_SSLOptions.KeyFile;
 372         if (SSL_CTX_use_certificate_chain_file(ctx, cert_key) != 1) {
 373                 array_free_wipe(&Conf_SSLOptions.KeyFilePassword);
 374                 LogOpenSSLError("SSL_CTX_use_certificate_file", cert_key);
 375                 return false;
 376         }
 377
 378         array_free_wipe(&Conf_SSLOptions.KeyFilePassword);
 379
 380         if (!SSL_CTX_check_private_key(ctx)) {
 381                 LogOpenSSLError("Server Private Key does not match certificate", NULL);
 382                 return false;
 383         }
 384         if (Load_DH_params()) {
 385                 if (SSL_CTX_set_tmp_dh(ctx, dh_params) != 1)
 386                         LogOpenSSLError("Error setting DH Parameters", Conf_SSLOptions.DHFile);
 387                 /* don't return false here: the non-DH modes will still work */
 388                 DH_free(dh_params);
 389                 dh_params = NULL;
 390         }
 391         return true;
 392 }
 393
 394
 395 #endif
 396 static bool
 397 ConnSSL_Init_SSL(CONNECTION *c)
 398 {
 399         int ret;
 400         assert(c != NULL);
 401 #ifdef HAVE_LIBSSL
 402         if (!ssl_ctx) {
 403                 Log(LOG_ERR, "Cannot init ssl_ctx: OpenSSL initialization failed at startup");
 404                 return false;
 405         }
 406         assert(c->ssl_state.ssl == NULL);
 407
 408         c->ssl_state.ssl = SSL_new(ssl_ctx);
 409         if (!c->ssl_state.ssl) {
 410                 LogOpenSSLError("SSL_new()", NULL);
 411                 return false;
 412         }
 413
 414         ret = SSL_set_fd(c->ssl_state.ssl, c->sock);
 415         if (ret != 1) {
 416                 LogOpenSSLError("SSL_set_fd()", NULL);
 417                 ConnSSL_Free(c);
 418                 return false;
 419         }
 420 #endif
 421 #ifdef HAVE_LIBGNUTLS
 422         ret = gnutls_set_default_priority(c->ssl_state.gnutls_session);
 423         if (ret < 0) {
 424                 Log(LOG_ERR, "gnutls_set_default_priority: %s", gnutls_strerror(ret));
 425                 ConnSSL_Free(c);
 426                 return false;
 427         }
 428         /*
 429          * The intermediate (long) cast is here to avoid a warning like:
 430          * "cast to pointer from integer of different size" on 64-bit platforms.
 431          * There doesn't seem to be an alternate GNUTLS API we could use instead, see e.g.
 432          * http://www.mail-archive.com/help-gnutls@gnu.org/msg00286.html
 433          */
 434         gnutls_transport_set_ptr(c->ssl_state.gnutls_session, (gnutls_transport_ptr_t) (long) c->sock);
 435         ret = gnutls_credentials_set(c->ssl_state.gnutls_session, GNUTLS_CRD_CERTIFICATE, x509_cred);
 436         if (ret < 0) {
 437                 Log(LOG_ERR, "gnutls_credentials_set: %s", gnutls_strerror(ret));
 438                 ConnSSL_Free(c);
 439                 return false;
 440         }
 441         gnutls_dh_set_prime_bits(c->ssl_state.gnutls_session, DH_BITS_MIN);
 442 #endif
 443         Conn_OPTION_ADD(c, CONN_SSL);
 444         return true;
 445 }
 446
 447
 448 bool
 449 ConnSSL_PrepareConnect(CONNECTION *c, UNUSED CONF_SERVER *s)
 450 {
 451         bool ret;
 452 #ifdef HAVE_LIBGNUTLS
 453         int err;
 454
 455         err = gnutls_init(&c->ssl_state.gnutls_session, GNUTLS_CLIENT);
 456         if (err) {
 457                 Log(LOG_ERR, "gnutls_init: %s", gnutls_strerror(err));
 458                 return false;
 459         }
 460 #endif
 461         ret = ConnSSL_Init_SSL(c);
 462         if (!ret)
 463                 return false;
 464         Conn_OPTION_ADD(c, CONN_SSL_CONNECT);
 465 #ifdef HAVE_LIBSSL
 466         assert(c->ssl_state.ssl);
 467         SSL_set_verify(c->ssl_state.ssl, SSL_VERIFY_NONE, NULL);
 468 #endif
 469         return true;
 470 }
 471
 472
 473 /*
 474   Check an Handle Error return code after failed calls to ssl/tls functions.
 475   OpenSSL:
 476   SSL_connect(), SSL_accept(), SSL_do_handshake(), SSL_read(), SSL_peek(), or SSL_write() on ssl.
 477   GNUTLS:
 478   gnutlsssl_read(), gnutls_write() or gnutls_handshake().
 479   Return: -1 on fatal error, 0 if we can try again later.
 480  */
 481 static int
 482 ConnSSL_HandleError( CONNECTION *c, const int code, const char *fname )
 483 {
 484 #ifdef HAVE_LIBSSL
 485         int ret = SSL_ERROR_SYSCALL;
 486         unsigned long sslerr;
 487         int real_errno = errno;
 488
 489         ret = SSL_get_error(c->ssl_state.ssl, code);
 490         switch (ret) {
 491         case SSL_ERROR_WANT_READ:
 492                 io_event_del(c->sock, IO_WANTWRITE);
 493                 Conn_OPTION_ADD(c, CONN_SSL_WANT_READ);
 494                 return 0;       /* try again later */
 495         case SSL_ERROR_WANT_WRITE:
 496                 io_event_del(c->sock, IO_WANTREAD);
 497                 Conn_OPTION_ADD(c, CONN_SSL_WANT_WRITE); /* fall through */
 498         case SSL_ERROR_NONE:
 499                 return 0;       /* try again later */
 500         case SSL_ERROR_ZERO_RETURN:
 501                 LogDebug("TLS/SSL connection shut down normally");
 502                 break;
 503         /*
 504         SSL_ERROR_WANT_CONNECT, SSL_ERROR_WANT_ACCEPT, SSL_ERROR_WANT_X509_LOOKUP
 505         */
 506         case SSL_ERROR_SYSCALL:
 507                 sslerr = ERR_get_error();
 508                 if (sslerr) {
 509                         Log( LOG_ERR, "%s: %s", fname, ERR_error_string(sslerr, NULL ));
 510                 } else {
 511
 512                         switch (code) { /* EOF that violated protocol */
 513                         case 0:
 514                                 Log(LOG_ERR, "%s: Client Disconnected", fname );
 515                                 break;
 516                         case -1: /* low level socket I/O error, check errno */
 517                                 Log(LOG_ERR, "%s: %s", fname, strerror(real_errno));
 518                         }
 519                 }
 520                 break;
 521         case SSL_ERROR_SSL:
 522                 LogOpenSSLError("TLS/SSL Protocol Error", fname);
 523                 break;
 524         default:
 525                 Log( LOG_ERR, "%s: Unknown error %d!", fname, ret);
 526         }
 527         ConnSSL_Free(c);
 528         return -1;
 529 #endif
 530 #ifdef HAVE_LIBGNUTLS
 531         switch (code) {
 532         case GNUTLS_E_AGAIN:
 533         case GNUTLS_E_INTERRUPTED:
 534                 if (gnutls_record_get_direction(c->ssl_state.gnutls_session)) {
 535                         Conn_OPTION_ADD(c, CONN_SSL_WANT_WRITE);
 536                         io_event_del(c->sock, IO_WANTREAD);
 537                 } else {
 538                         Conn_OPTION_ADD(c, CONN_SSL_WANT_READ);
 539                         io_event_del(c->sock, IO_WANTWRITE);
 540                 }
 541                 break;
 542         default:
 543                 assert(code < 0);
 544                 if (gnutls_error_is_fatal(code)) {
 545                         Log(LOG_ERR, "%s: %s", fname, gnutls_strerror(code));
 546                         ConnSSL_Free(c);
 547                         return -1;
 548                 }
 549         }
 550         return 0;
 551 #endif
 552 }
 553
 554
 555 static void
 556 ConnSSL_LogCertInfo( CONNECTION *c )
 557 {
 558 #ifdef HAVE_LIBSSL
 559         SSL *ssl = c->ssl_state.ssl;
 560
 561         assert(ssl);
 562
 563         Log(LOG_INFO, "Connection %d: initialized %s using cipher %s.",
 564                 c->sock, SSL_get_version(ssl), SSL_get_cipher(ssl));
 565 #endif
 566 #ifdef HAVE_LIBGNUTLS
 567         gnutls_session_t sess = c->ssl_state.gnutls_session;
 568         gnutls_cipher_algorithm_t cipher = gnutls_cipher_get(sess);
 569
 570         Log(LOG_INFO, "Connection %d: initialized %s using cipher %s-%s.",
 571             c->sock,
 572             gnutls_protocol_get_name(gnutls_protocol_get_version(sess)),
 573             gnutls_cipher_get_name(cipher),
 574             gnutls_mac_get_name(gnutls_mac_get(sess)));
 575 #endif
 576 }
 577
 578
 579 /*
 580  Accept incoming SSL connection.
 581  Return Values:
 582          1: SSL Connection established
 583          0: try again
 584         -1: SSL Connection not established due to fatal error.
 585 */
 586 int
 587 ConnSSL_Accept( CONNECTION *c )
 588 {
 589         assert(c != NULL);
 590         if (!Conn_OPTION_ISSET(c, CONN_SSL)) {
 591 #ifdef HAVE_LIBGNUTLS
 592                 int err = gnutls_init(&c->ssl_state.gnutls_session, GNUTLS_SERVER);
 593                 if (err) {
 594                         Log(LOG_ERR, "gnutls_init: %s", gnutls_strerror(err));
 595                         return false;
 596                 }
 597 #endif
 598                 LogDebug("ConnSSL_Accept: Initializing SSL data");
 599                 if (!ConnSSL_Init_SSL(c))
 600                         return -1;
 601         }
 602         return ConnectAccept(c, false );
 603 }
 604
 605
 606 int
 607 ConnSSL_Connect( CONNECTION *c )
 608 {
 609         assert(c != NULL);
 610 #ifdef HAVE_LIBSSL
 611         assert(c->ssl_state.ssl);
 612 #endif
 613         assert(Conn_OPTION_ISSET(c, CONN_SSL));
 614         return ConnectAccept(c, true);
 615 }
 616
 617
 618 /* accept/connect wrapper. if connect is true, connect to peer, otherwise wait for incoming connection */
 619 static int
 620 ConnectAccept( CONNECTION *c, bool connect)
 621 {
 622         int ret;
 623 #ifdef HAVE_LIBSSL
 624         SSL *ssl = c->ssl_state.ssl;
 625         assert(ssl != NULL);
 626
 627         ret = connect ? SSL_connect(ssl) : SSL_accept(ssl);
 628         if (1 != ret)
 629                 return ConnSSL_HandleError(c, ret, connect ? "SSL_connect": "SSL_accept");
 630 #endif
 631 #ifdef HAVE_LIBGNUTLS
 632         (void) connect;
 633         ret = gnutls_handshake(c->ssl_state.gnutls_session);
 634         if (ret)
 635                 return ConnSSL_HandleError(c, ret, "gnutls_handshake");
 636 #endif /* _GNUTLS */
 637         Conn_OPTION_DEL(c, (CONN_SSL_WANT_WRITE|CONN_SSL_WANT_READ|CONN_SSL_CONNECT));
 638         ConnSSL_LogCertInfo(c);
 639
 640         Conn_StartLogin(CONNECTION2ID(c));
 641         return 1;
 642 }
 643
 644
 645 ssize_t
 646 ConnSSL_Write(CONNECTION *c, const void *buf, size_t count)
 647 {
 648         ssize_t bw;
 649
 650         Conn_OPTION_DEL(c, CONN_SSL_WANT_WRITE|CONN_SSL_WANT_READ);
 651
 652         assert(count > 0);
 653 #ifdef HAVE_LIBSSL
 654         bw = (ssize_t) SSL_write(c->ssl_state.ssl, buf, count);
 655 #endif
 656 #ifdef HAVE_LIBGNUTLS
 657         bw = gnutls_write(c->ssl_state.gnutls_session, buf, count);
 658 #endif
 659         if (bw > 0)
 660                 return bw;
 661         if (ConnSSL_HandleError( c, bw, "ConnSSL_Write") == 0)
 662                 errno = EAGAIN; /* try again */
 663         return -1;
 664 }
 665
 666
 667 ssize_t
 668 ConnSSL_Read(CONNECTION *c, void * buf, size_t count)
 669 {
 670         ssize_t br;
 671
 672         Conn_OPTION_DEL(c, CONN_SSL_WANT_WRITE|CONN_SSL_WANT_READ);
 673 #ifdef HAVE_LIBSSL
 674         br = (ssize_t) SSL_read(c->ssl_state.ssl, buf, count);
 675         if (br > 0)     /* on EOF we have to call ConnSSL_HandleError(), see SSL_read(3) */
 676                 return br;
 677 #endif
 678 #ifdef HAVE_LIBGNUTLS
 679         br = gnutls_read(c->ssl_state.gnutls_session, buf, count);
 680         if (br >= 0)    /* on EOF we must _not_ call ConnSSL_HandleError, see gnutls_record_recv(3) */
 681                 return br;
 682 #endif
 683         /* error on read: switch ConnSSL_HandleError() return values -> 0 is "try again", so return -1 and set EAGAIN */
 684         if (ConnSSL_HandleError(c, br, "ConnSSL_Read") == 0) {
 685                 errno = EAGAIN;
 686                 return -1;
 687         }
 688         return 0;
 689 }
 690
 691
 692 bool
 693 ConnSSL_GetCipherInfo(CONNECTION *c, char *buf, size_t len)
 694 {
 695 #ifdef HAVE_LIBSSL
 696         char *nl;
 697         SSL *ssl = c->ssl_state.ssl;
 698
 699         if (!ssl)
 700                 return false;
 701         *buf = 0;
 702         SSL_CIPHER_description(SSL_get_current_cipher(ssl), buf, len);
 703         nl = strchr(buf, '\n');
 704         if (nl)
 705                 *nl = 0;
 706         return true;
 707 #endif
 708 #ifdef HAVE_LIBGNUTLS
 709         if (Conn_OPTION_ISSET(c, CONN_SSL)) {
 710                 const char *name_cipher, *name_mac, *name_proto, *name_keyexchange;
 711                 unsigned keysize;
 712
 713                 gnutls_session_t sess = c->ssl_state.gnutls_session;
 714                 gnutls_cipher_algorithm_t cipher = gnutls_cipher_get(sess);
 715                 name_cipher = gnutls_cipher_get_name(cipher);
 716                 name_mac = gnutls_mac_get_name(gnutls_mac_get(sess));
 717                 keysize = gnutls_cipher_get_key_size(cipher) * 8;
 718                 name_proto = gnutls_protocol_get_name(gnutls_protocol_get_version(sess));
 719                 name_keyexchange = gnutls_kx_get_name(gnutls_kx_get(sess));
 720
 721                 return snprintf(buf, len, "%s-%s%15s Kx=%s      Enc=%s(%u) Mac=%s",
 722                         name_cipher, name_mac, name_proto, name_keyexchange, name_cipher, keysize, name_mac) > 0;
 723         }
 724         return false;
 725 #endif
 726 }
 727
 728 #else
 729
 730 bool
 731 ConnSSL_InitLibrary(void)
 732 {
 733         return true;
 734 }
 735
 736 #endif /* SSL_SUPPORT */
 737 /* -eof- */
 738
 739