src/ngircd/conn-ssl.c

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