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 (!array_bytes(&Conf_SSLOptions.ListenPorts))
 245                 return true;
 246
 247 #ifdef HAVE_LIBSSL
 248         SSL_CTX *newctx;
 249
 250         if (!ssl_ctx) {
 251                 SSL_library_init();
 252                 SSL_load_error_strings();
 253         }
 254
 255         if (!RAND_status()) {
 256                 Log(LOG_ERR, "OpenSSL PRNG not seeded: /dev/urandom missing?");
 257                 /*
 258                  * it is probably best to fail and let the user install EGD or a similar program if no kernel random device is available.
 259                  * According to OpenSSL RAND_egd(3): "The automatic query of /var/run/egd-pool et al was added in OpenSSL 0.9.7";
 260                  * so it makes little sense to deal with PRNGD seeding ourselves.
 261                  */
 262                 array_free(&Conf_SSLOptions.ListenPorts);
 263                 return false;
 264         }
 265
 266         newctx = SSL_CTX_new(SSLv23_method());
 267         if (!newctx) {
 268                 LogOpenSSLError("SSL_CTX_new()", NULL);
 269                 array_free(&Conf_SSLOptions.ListenPorts);
 270                 return false;
 271         }
 272
 273         if (!ConnSSL_LoadServerKey_openssl(newctx))
 274                 goto out;
 275
 276         SSL_CTX_set_options(newctx, SSL_OP_SINGLE_DH_USE|SSL_OP_NO_SSLv2);
 277         SSL_CTX_set_mode(newctx, SSL_MODE_ENABLE_PARTIAL_WRITE);
 278         SSL_CTX_free(ssl_ctx);
 279         ssl_ctx = newctx;
 280         Log(LOG_INFO, "%s initialized.", SSLeay_version(SSLEAY_VERSION));
 281         return true;
 282 out:
 283         SSL_CTX_free(newctx);
 284         array_free(&Conf_SSLOptions.ListenPorts);
 285         return false;
 286 #endif
 287 #ifdef HAVE_LIBGNUTLS
 288         int err;
 289         static bool initialized;
 290         if (initialized) /* TODO: cannot reload gnutls keys: can't simply free x509 context -- it may still be in use */
 291                 return false;
 292
 293         err = gnutls_global_init();
 294         if (err) {
 295                 Log(LOG_ERR, "gnutls_global_init(): %s", gnutls_strerror(err));
 296                 array_free(&Conf_SSLOptions.ListenPorts);
 297                 return false;
 298         }
 299         if (!ConnSSL_LoadServerKey_gnutls()) {
 300                 array_free(&Conf_SSLOptions.ListenPorts);
 301                 return false;
 302         }
 303         Log(LOG_INFO, "gnutls %s initialized.", gnutls_check_version(NULL));
 304         initialized = true;
 305         return true;
 306 #endif
 307 }
 308
 309
 310 #ifdef HAVE_LIBGNUTLS
 311 static bool
 312 ConnSSL_LoadServerKey_gnutls(void)
 313 {
 314         int err;
 315         const char *cert_file;
 316
 317         err = gnutls_certificate_allocate_credentials(&x509_cred);
 318         if (err < 0) {
 319                 Log(LOG_ERR, "gnutls_certificate_allocate_credentials: %s", gnutls_strerror(err));
 320                 return false;
 321         }
 322
 323         cert_file = Conf_SSLOptions.CertFile ? Conf_SSLOptions.CertFile:Conf_SSLOptions.KeyFile;
 324         if (!cert_file) {
 325                 Log(LOG_ERR, "No SSL server key configured!");
 326                 return false;
 327         }
 328
 329         if (array_bytes(&Conf_SSLOptions.KeyFilePassword))
 330                 Log(LOG_WARNING,
 331                     "Ignoring KeyFilePassword: Not supported by GNUTLS.");
 332
 333         if (!Load_DH_params())
 334                 return false;
 335
 336         gnutls_certificate_set_dh_params(x509_cred, dh_params);
 337         err = gnutls_certificate_set_x509_key_file(x509_cred, cert_file, Conf_SSLOptions.KeyFile, GNUTLS_X509_FMT_PEM);
 338         if (err < 0) {
 339                 Log(LOG_ERR, "gnutls_certificate_set_x509_key_file (cert %s, key %s): %s",
 340                                 cert_file, Conf_SSLOptions.KeyFile ? Conf_SSLOptions.KeyFile : "(NULL)", gnutls_strerror(err));
 341                 return false;
 342         }
 343         return true;
 344 }
 345 #endif
 346
 347
 348 #ifdef HAVE_LIBSSL
 349 static bool
 350 ConnSSL_LoadServerKey_openssl(SSL_CTX *ctx)
 351 {
 352         char *cert_key;
 353
 354         assert(ctx);
 355         if (!Conf_SSLOptions.KeyFile) {
 356                 Log(LOG_ERR, "No SSL server key configured!");
 357                 return false;
 358         }
 359
 360         SSL_CTX_set_default_passwd_cb(ctx, pem_passwd_cb);
 361         SSL_CTX_set_default_passwd_cb_userdata(ctx, &Conf_SSLOptions.KeyFilePassword);
 362
 363         if (SSL_CTX_use_PrivateKey_file(ctx, Conf_SSLOptions.KeyFile, SSL_FILETYPE_PEM) != 1) {
 364                 array_free_wipe(&Conf_SSLOptions.KeyFilePassword);
 365                 LogOpenSSLError("SSL_CTX_use_PrivateKey_file",  Conf_SSLOptions.KeyFile);
 366                 return false;
 367         }
 368
 369         cert_key = Conf_SSLOptions.CertFile ? Conf_SSLOptions.CertFile:Conf_SSLOptions.KeyFile;
 370         if (SSL_CTX_use_certificate_chain_file(ctx, cert_key) != 1) {
 371                 array_free_wipe(&Conf_SSLOptions.KeyFilePassword);
 372                 LogOpenSSLError("SSL_CTX_use_certificate_file", cert_key);
 373                 return false;
 374         }
 375
 376         array_free_wipe(&Conf_SSLOptions.KeyFilePassword);
 377
 378         if (!SSL_CTX_check_private_key(ctx)) {
 379                 LogOpenSSLError("Server Private Key does not match certificate", NULL);
 380                 return false;
 381         }
 382         if (Load_DH_params()) {
 383                 if (SSL_CTX_set_tmp_dh(ctx, dh_params) != 1)
 384                         LogOpenSSLError("Error setting DH Parameters", Conf_SSLOptions.DHFile);
 385                 /* don't return false here: the non-DH modes will still work */
 386                 DH_free(dh_params);
 387                 dh_params = NULL;
 388         }
 389         return true;
 390 }
 391
 392
 393 #endif
 394 static bool
 395 ConnSSL_Init_SSL(CONNECTION *c)
 396 {
 397         int ret;
 398         assert(c != NULL);
 399 #ifdef HAVE_LIBSSL
 400         if (!ssl_ctx) {
 401                 Log(LOG_ERR, "Cannot init ssl_ctx: OpenSSL initialization failed at startup");
 402                 return false;
 403         }
 404         assert(c->ssl_state.ssl == NULL);
 405
 406         c->ssl_state.ssl = SSL_new(ssl_ctx);
 407         if (!c->ssl_state.ssl) {
 408                 LogOpenSSLError("SSL_new()", NULL);
 409                 return false;
 410         }
 411
 412         ret = SSL_set_fd(c->ssl_state.ssl, c->sock);
 413         if (ret != 1) {
 414                 LogOpenSSLError("SSL_set_fd()", NULL);
 415                 ConnSSL_Free(c);
 416                 return false;
 417         }
 418 #endif
 419 #ifdef HAVE_LIBGNUTLS
 420         ret = gnutls_set_default_priority(c->ssl_state.gnutls_session);
 421         if (ret < 0) {
 422                 Log(LOG_ERR, "gnutls_set_default_priority: %s", gnutls_strerror(ret));
 423                 ConnSSL_Free(c);
 424                 return false;
 425         }
 426         /*
 427          * The intermediate (long) cast is here to avoid a warning like:
 428          * "cast to pointer from integer of different size" on 64-bit platforms.
 429          * There doesn't seem to be an alternate GNUTLS API we could use instead, see e.g.
 430          * http://www.mail-archive.com/help-gnutls@gnu.org/msg00286.html
 431          */
 432         gnutls_transport_set_ptr(c->ssl_state.gnutls_session, (gnutls_transport_ptr_t) (long) c->sock);
 433         ret = gnutls_credentials_set(c->ssl_state.gnutls_session, GNUTLS_CRD_CERTIFICATE, x509_cred);
 434         if (ret < 0) {
 435                 Log(LOG_ERR, "gnutls_credentials_set: %s", gnutls_strerror(ret));
 436                 ConnSSL_Free(c);
 437                 return false;
 438         }
 439         gnutls_dh_set_prime_bits(c->ssl_state.gnutls_session, DH_BITS_MIN);
 440 #endif
 441         Conn_OPTION_ADD(c, CONN_SSL);
 442         return true;
 443 }
 444
 445
 446 bool
 447 ConnSSL_PrepareConnect(CONNECTION *c, UNUSED CONF_SERVER *s)
 448 {
 449         bool ret;
 450 #ifdef HAVE_LIBGNUTLS
 451         int err;
 452
 453         err = gnutls_init(&c->ssl_state.gnutls_session, GNUTLS_CLIENT);
 454         if (err) {
 455                 Log(LOG_ERR, "gnutls_init: %s", gnutls_strerror(err));
 456                 return false;
 457         }
 458 #endif
 459         ret = ConnSSL_Init_SSL(c);
 460         if (!ret)
 461                 return false;
 462         Conn_OPTION_ADD(c, CONN_SSL_CONNECT);
 463 #ifdef HAVE_LIBSSL
 464         assert(c->ssl_state.ssl);
 465         SSL_set_verify(c->ssl_state.ssl, SSL_VERIFY_NONE, NULL);
 466 #endif
 467         return true;
 468 }
 469
 470
 471 /*
 472   Check an Handle Error return code after failed calls to ssl/tls functions.
 473   OpenSSL:
 474   SSL_connect(), SSL_accept(), SSL_do_handshake(), SSL_read(), SSL_peek(), or SSL_write() on ssl.
 475   GNUTLS:
 476   gnutlsssl_read(), gnutls_write() or gnutls_handshake().
 477   Return: -1 on fatal error, 0 if we can try again later.
 478  */
 479 static int
 480 ConnSSL_HandleError( CONNECTION *c, const int code, const char *fname )
 481 {
 482 #ifdef HAVE_LIBSSL
 483         int ret = SSL_ERROR_SYSCALL;
 484         unsigned long sslerr;
 485         int real_errno = errno;
 486
 487         ret = SSL_get_error(c->ssl_state.ssl, code);
 488         switch (ret) {
 489         case SSL_ERROR_WANT_READ:
 490                 io_event_del(c->sock, IO_WANTWRITE);
 491                 Conn_OPTION_ADD(c, CONN_SSL_WANT_READ);
 492                 return 0;       /* try again later */
 493         case SSL_ERROR_WANT_WRITE:
 494                 io_event_del(c->sock, IO_WANTREAD);
 495                 Conn_OPTION_ADD(c, CONN_SSL_WANT_WRITE); /* fall through */
 496         case SSL_ERROR_NONE:
 497                 return 0;       /* try again later */
 498         case SSL_ERROR_ZERO_RETURN:
 499                 LogDebug("TLS/SSL connection shut down normally");
 500                 break;
 501         /*
 502         SSL_ERROR_WANT_CONNECT, SSL_ERROR_WANT_ACCEPT, SSL_ERROR_WANT_X509_LOOKUP
 503         */
 504         case SSL_ERROR_SYSCALL:
 505                 sslerr = ERR_get_error();
 506                 if (sslerr) {
 507                         Log( LOG_ERR, "%s: %s", fname, ERR_error_string(sslerr, NULL ));
 508                 } else {
 509
 510                         switch (code) { /* EOF that violated protocol */
 511                         case 0:
 512                                 Log(LOG_ERR, "%s: Client Disconnected", fname );
 513                                 break;
 514                         case -1: /* low level socket I/O error, check errno */
 515                                 Log(LOG_ERR, "%s: %s", fname, strerror(real_errno));
 516                         }
 517                 }
 518                 break;
 519         case SSL_ERROR_SSL:
 520                 LogOpenSSLError("TLS/SSL Protocol Error", fname);
 521                 break;
 522         default:
 523                 Log( LOG_ERR, "%s: Unknown error %d!", fname, ret);
 524         }
 525         ConnSSL_Free(c);
 526         return -1;
 527 #endif
 528 #ifdef HAVE_LIBGNUTLS
 529         switch (code) {
 530         case GNUTLS_E_AGAIN:
 531         case GNUTLS_E_INTERRUPTED:
 532                 if (gnutls_record_get_direction(c->ssl_state.gnutls_session)) {
 533                         Conn_OPTION_ADD(c, CONN_SSL_WANT_WRITE);
 534                         io_event_del(c->sock, IO_WANTREAD);
 535                 } else {
 536                         Conn_OPTION_ADD(c, CONN_SSL_WANT_READ);
 537                         io_event_del(c->sock, IO_WANTWRITE);
 538                 }
 539                 break;
 540         default:
 541                 assert(code < 0);
 542                 if (gnutls_error_is_fatal(code)) {
 543                         Log(LOG_ERR, "%s: %s", fname, gnutls_strerror(code));
 544                         ConnSSL_Free(c);
 545                         return -1;
 546                 }
 547         }
 548         return 0;
 549 #endif
 550 }
 551
 552
 553 static void
 554 ConnSSL_LogCertInfo( CONNECTION *c )
 555 {
 556 #ifdef HAVE_LIBSSL
 557         SSL *ssl = c->ssl_state.ssl;
 558
 559         assert(ssl);
 560
 561         Log(LOG_INFO, "Connection %d: initialized %s using cipher %s.",
 562                 c->sock, SSL_get_version(ssl), SSL_get_cipher(ssl));
 563 #endif
 564 #ifdef HAVE_LIBGNUTLS
 565         gnutls_session_t sess = c->ssl_state.gnutls_session;
 566         gnutls_cipher_algorithm_t cipher = gnutls_cipher_get(sess);
 567
 568         Log(LOG_INFO, "Connection %d: initialized %s using cipher %s-%s.",
 569             c->sock,
 570             gnutls_protocol_get_name(gnutls_protocol_get_version(sess)),
 571             gnutls_cipher_get_name(cipher),
 572             gnutls_mac_get_name(gnutls_mac_get(sess)));
 573 #endif
 574 }
 575
 576
 577 /*
 578  Accept incoming SSL connection.
 579  Return Values:
 580          1: SSL Connection established
 581          0: try again
 582         -1: SSL Connection not established due to fatal error.
 583 */
 584 int
 585 ConnSSL_Accept( CONNECTION *c )
 586 {
 587         assert(c != NULL);
 588         if (!Conn_OPTION_ISSET(c, CONN_SSL)) {
 589 #ifdef HAVE_LIBGNUTLS
 590                 int err = gnutls_init(&c->ssl_state.gnutls_session, GNUTLS_SERVER);
 591                 if (err) {
 592                         Log(LOG_ERR, "gnutls_init: %s", gnutls_strerror(err));
 593                         return false;
 594                 }
 595 #endif
 596                 LogDebug("ConnSSL_Accept: Initializing SSL data");
 597                 if (!ConnSSL_Init_SSL(c))
 598                         return -1;
 599         }
 600         return ConnectAccept(c, false );
 601 }
 602
 603
 604 int
 605 ConnSSL_Connect( CONNECTION *c )
 606 {
 607         assert(c != NULL);
 608 #ifdef HAVE_LIBSSL
 609         assert(c->ssl_state.ssl);
 610 #endif
 611         assert(Conn_OPTION_ISSET(c, CONN_SSL));
 612         return ConnectAccept(c, true);
 613 }
 614
 615
 616 /* accept/connect wrapper. if connect is true, connect to peer, otherwise wait for incoming connection */
 617 static int
 618 ConnectAccept( CONNECTION *c, bool connect)
 619 {
 620         int ret;
 621 #ifdef HAVE_LIBSSL
 622         SSL *ssl = c->ssl_state.ssl;
 623         assert(ssl != NULL);
 624
 625         ret = connect ? SSL_connect(ssl) : SSL_accept(ssl);
 626         if (1 != ret)
 627                 return ConnSSL_HandleError(c, ret, connect ? "SSL_connect": "SSL_accept");
 628 #endif
 629 #ifdef HAVE_LIBGNUTLS
 630         (void) connect;
 631         ret = gnutls_handshake(c->ssl_state.gnutls_session);
 632         if (ret)
 633                 return ConnSSL_HandleError(c, ret, "gnutls_handshake");
 634 #endif /* _GNUTLS */
 635         Conn_OPTION_DEL(c, (CONN_SSL_WANT_WRITE|CONN_SSL_WANT_READ|CONN_SSL_CONNECT));
 636         ConnSSL_LogCertInfo(c);
 637
 638         Conn_StartLogin(CONNECTION2ID(c));
 639         return 1;
 640 }
 641
 642
 643 ssize_t
 644 ConnSSL_Write(CONNECTION *c, const void *buf, size_t count)
 645 {
 646         ssize_t bw;
 647
 648         Conn_OPTION_DEL(c, CONN_SSL_WANT_WRITE|CONN_SSL_WANT_READ);
 649
 650         assert(count > 0);
 651 #ifdef HAVE_LIBSSL
 652         bw = (ssize_t) SSL_write(c->ssl_state.ssl, buf, count);
 653 #endif
 654 #ifdef HAVE_LIBGNUTLS
 655         bw = gnutls_write(c->ssl_state.gnutls_session, buf, count);
 656 #endif
 657         if (bw > 0)
 658                 return bw;
 659         if (ConnSSL_HandleError( c, bw, "ConnSSL_Write") == 0)
 660                 errno = EAGAIN; /* try again */
 661         return -1;
 662 }
 663
 664
 665 ssize_t
 666 ConnSSL_Read(CONNECTION *c, void * buf, size_t count)
 667 {
 668         ssize_t br;
 669
 670         Conn_OPTION_DEL(c, CONN_SSL_WANT_WRITE|CONN_SSL_WANT_READ);
 671 #ifdef HAVE_LIBSSL
 672         br = (ssize_t) SSL_read(c->ssl_state.ssl, buf, count);
 673         if (br > 0)     /* on EOF we have to call ConnSSL_HandleError(), see SSL_read(3) */
 674                 return br;
 675 #endif
 676 #ifdef HAVE_LIBGNUTLS
 677         br = gnutls_read(c->ssl_state.gnutls_session, buf, count);
 678         if (br >= 0)    /* on EOF we must _not_ call ConnSSL_HandleError, see gnutls_record_recv(3) */
 679                 return br;
 680 #endif
 681         /* error on read: switch ConnSSL_HandleError() return values -> 0 is "try again", so return -1 and set EAGAIN */
 682         if (ConnSSL_HandleError(c, br, "ConnSSL_Read") == 0) {
 683                 errno = EAGAIN;
 684                 return -1;
 685         }
 686         return 0;
 687 }
 688
 689
 690 bool
 691 ConnSSL_GetCipherInfo(CONNECTION *c, char *buf, size_t len)
 692 {
 693 #ifdef HAVE_LIBSSL
 694         char *nl;
 695         SSL *ssl = c->ssl_state.ssl;
 696
 697         if (!ssl)
 698                 return false;
 699         *buf = 0;
 700         SSL_CIPHER_description(SSL_get_current_cipher(ssl), buf, len);
 701         nl = strchr(buf, '\n');
 702         if (nl)
 703                 *nl = 0;
 704         return true;
 705 #endif
 706 #ifdef HAVE_LIBGNUTLS
 707         if (Conn_OPTION_ISSET(c, CONN_SSL)) {
 708                 const char *name_cipher, *name_mac, *name_proto, *name_keyexchange;
 709                 unsigned keysize;
 710
 711                 gnutls_session_t sess = c->ssl_state.gnutls_session;
 712                 gnutls_cipher_algorithm_t cipher = gnutls_cipher_get(sess);
 713                 name_cipher = gnutls_cipher_get_name(cipher);
 714                 name_mac = gnutls_mac_get_name(gnutls_mac_get(sess));
 715                 keysize = gnutls_cipher_get_key_size(cipher) * 8;
 716                 name_proto = gnutls_protocol_get_name(gnutls_protocol_get_version(sess));
 717                 name_keyexchange = gnutls_kx_get_name(gnutls_kx_get(sess));
 718
 719                 return snprintf(buf, len, "%s-%s%15s Kx=%s      Enc=%s(%u) Mac=%s",
 720                         name_cipher, name_mac, name_proto, name_keyexchange, name_cipher, keysize, name_mac) > 0;
 721         }
 722         return false;
 723 #endif
 724 }
 725
 726 #else
 727
 728 bool
 729 ConnSSL_InitLibrary(void)
 730 {
 731         return true;
 732 }
 733
 734 #endif /* SSL_SUPPORT */
 735 /* -eof- */
 736
 737