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", Conf_SSLOptions.DHFile);
 165                 ret = false;
 166         }
 167         fclose(fp);
 168         return ret;
 169 #endif
 170 #ifdef HAVE_LIBGNUTLS
 171         bool need_dhgenerate = true;
 172         int err;
 173         gnutls_dh_params_t tmp_dh_params;
 174
 175         err = gnutls_dh_params_init(&tmp_dh_params);
 176         if (err < 0) {
 177                 Log(LOG_ERR, "gnutls_dh_params_init: %s", gnutls_strerror(err));
 178                 return false;
 179         }
 180         if (Conf_SSLOptions.DHFile) {
 181                 gnutls_datum_t dhparms;
 182                 size_t size;
 183                 dhparms.data = (unsigned char *) openreadclose(Conf_SSLOptions.DHFile, &size);
 184                 if (dhparms.data) {
 185                         dhparms.size = size;
 186                         err = gnutls_dh_params_import_pkcs3(tmp_dh_params, &dhparms, GNUTLS_X509_FMT_PEM);
 187                         if (err == 0)
 188                                 need_dhgenerate = false;
 189                         else
 190                                 Log(LOG_ERR, "gnutls_dh_params_init: %s", gnutls_strerror(err));
 191
 192                         memset(dhparms.data, 0, size);
 193                         free(dhparms.data);
 194                 }
 195         }
 196         if (need_dhgenerate) {
 197                 Log(LOG_WARNING, "SSLDHFile not set, generating %u bit DH parameters. This may take a while...", DH_BITS);
 198                 err = gnutls_dh_params_generate2(tmp_dh_params, DH_BITS);
 199                 if (err < 0) {
 200                         Log(LOG_ERR, "gnutls_dh_params_generate2: %s", gnutls_strerror(err));
 201                         return false;
 202                 }
 203         }
 204         dh_params = tmp_dh_params;
 205         return true;
 206 #endif
 207 }
 208
 209
 210 void ConnSSL_Free(CONNECTION *c)
 211 {
 212 #ifdef HAVE_LIBSSL
 213         SSL *ssl = c->ssl_state.ssl;
 214         if (ssl) {
 215                 SSL_shutdown(ssl);
 216                 SSL_free(ssl);
 217                 c->ssl_state.ssl = NULL;
 218         }
 219 #endif
 220 #ifdef HAVE_LIBGNUTLS
 221         gnutls_session_t sess = c->ssl_state.gnutls_session;
 222         if (Conn_OPTION_ISSET(c, CONN_SSL)) {
 223                 gnutls_bye(sess, GNUTLS_SHUT_RDWR);
 224                 gnutls_deinit(sess);
 225         }
 226 #endif
 227         assert(Conn_OPTION_ISSET(c, CONN_SSL));
 228         Conn_OPTION_DEL(c, (CONN_SSL_CONNECT|CONN_SSL|CONN_SSL_WANT_WRITE));
 229 }
 230
 231
 232 bool
 233 ConnSSL_InitLibrary( void )
 234 {
 235 #ifdef HAVE_LIBSSL
 236         SSL_CTX *newctx;
 237
 238         if (!ssl_ctx) {
 239                 SSL_library_init();
 240                 SSL_load_error_strings();
 241         }
 242
 243         if (!RAND_status()) {
 244                 Log(LOG_ERR, "OpenSSL PRNG not seeded: /dev/urandom missing?");
 245                 /*
 246                  * it is probably best to fail and let the user install EGD or a similar program if no kernel random device is available.
 247                  * According to OpenSSL RAND_egd(3): "The automatic query of /var/run/egd-pool et al was added in OpenSSL 0.9.7";
 248                  * so it makes little sense to deal with PRNGD seeding ourselves.
 249                  */
 250                 return false;
 251         }
 252
 253         newctx = SSL_CTX_new(SSLv23_method());
 254         if (!newctx) {
 255                 LogOpenSSLError("SSL_CTX_new()", NULL);
 256                 return false;
 257         }
 258
 259         if (!ConnSSL_LoadServerKey_openssl(newctx))
 260                 goto out;
 261
 262         SSL_CTX_set_options(newctx, SSL_OP_SINGLE_DH_USE|SSL_OP_NO_SSLv2);
 263         SSL_CTX_set_mode(newctx, SSL_MODE_ENABLE_PARTIAL_WRITE);
 264         SSL_CTX_free(ssl_ctx);
 265         ssl_ctx = newctx;
 266         Log(LOG_INFO, "%s initialized", SSLeay_version(SSLEAY_VERSION));
 267         return true;
 268 out:
 269         SSL_CTX_free(newctx);
 270         return false;
 271 #endif
 272 #ifdef HAVE_LIBGNUTLS
 273         int err;
 274         static bool initialized;
 275         if (initialized) /* TODO: cannot reload gnutls keys: can't simply free x509 context -- it may still be in use */
 276                 return false;
 277
 278         err = gnutls_global_init();
 279         if (err) {
 280                 Log(LOG_ERR, "gnutls_global_init(): %s", gnutls_strerror(err));
 281                 return false;
 282         }
 283         if (!ConnSSL_LoadServerKey_gnutls())
 284                 return false;
 285         Log(LOG_INFO, "gnutls %s initialized", gnutls_check_version(NULL));
 286         initialized = true;
 287         return true;
 288 #endif
 289 }
 290
 291
 292 #ifdef HAVE_LIBGNUTLS
 293 static bool
 294 ConnSSL_LoadServerKey_gnutls(void)
 295 {
 296         int err;
 297         const char *cert_file;
 298
 299         err = gnutls_certificate_allocate_credentials(&x509_cred);
 300         if (err < 0) {
 301                 Log(LOG_ERR, "gnutls_certificate_allocate_credentials: %s", gnutls_strerror(err));
 302                 return false;
 303         }
 304
 305         cert_file = Conf_SSLOptions.CertFile ? Conf_SSLOptions.CertFile:Conf_SSLOptions.KeyFile;
 306         if (!cert_file) {
 307                 Log(LOG_ERR, "Neither Key nor certificate File set");
 308                 return false;
 309         }
 310
 311         if (array_bytes(&Conf_SSLOptions.KeyFilePassword))
 312                 Log(LOG_WARNING, "Ignoring KeyFilePassword: Not supported by GNUTLS");
 313
 314         if (!Load_DH_params())
 315                 return false;
 316
 317         gnutls_certificate_set_dh_params(x509_cred, dh_params);
 318         err = gnutls_certificate_set_x509_key_file(x509_cred, cert_file, Conf_SSLOptions.KeyFile, GNUTLS_X509_FMT_PEM);
 319         if (err < 0) {
 320                 Log(LOG_ERR, "gnutls_certificate_set_x509_key_file (cert %s, key %s): %s",
 321                                 cert_file, Conf_SSLOptions.KeyFile ? Conf_SSLOptions.KeyFile : "(NULL)", gnutls_strerror(err));
 322                 return false;
 323         }
 324         return true;
 325 }
 326 #endif
 327
 328
 329 #ifdef HAVE_LIBSSL
 330 static bool
 331 ConnSSL_LoadServerKey_openssl(SSL_CTX *ctx)
 332 {
 333         char *cert_key;
 334
 335         assert(ctx);
 336         if (!Conf_SSLOptions.KeyFile) {
 337                 Log(LOG_NOTICE, "No SSL Server Key configured, ssl disabled");
 338                 return false;
 339         }
 340
 341         SSL_CTX_set_default_passwd_cb(ctx, pem_passwd_cb);
 342         SSL_CTX_set_default_passwd_cb_userdata(ctx, &Conf_SSLOptions.KeyFilePassword);
 343
 344         if (SSL_CTX_use_PrivateKey_file(ctx, Conf_SSLOptions.KeyFile, SSL_FILETYPE_PEM) != 1) {
 345                 array_free_wipe(&Conf_SSLOptions.KeyFilePassword);
 346                 LogOpenSSLError("SSL_CTX_use_PrivateKey_file",  Conf_SSLOptions.KeyFile);
 347                 return false;
 348         }
 349
 350         cert_key = Conf_SSLOptions.CertFile ? Conf_SSLOptions.CertFile:Conf_SSLOptions.KeyFile;
 351         if (SSL_CTX_use_certificate_chain_file(ctx, cert_key) != 1) {
 352                 array_free_wipe(&Conf_SSLOptions.KeyFilePassword);
 353                 LogOpenSSLError("SSL_CTX_use_certificate_file", cert_key);
 354                 return false;
 355         }
 356
 357         array_free_wipe(&Conf_SSLOptions.KeyFilePassword);
 358
 359         if (!SSL_CTX_check_private_key(ctx)) {
 360                 LogOpenSSLError("Server Private Key does not match certificate", NULL);
 361                 return false;
 362         }
 363         if (Load_DH_params()) {
 364                 if (SSL_CTX_set_tmp_dh(ctx, dh_params) != 1)
 365                         LogOpenSSLError("Error setting DH Parameters", Conf_SSLOptions.DHFile);
 366                 /* don't return false here: the non-DH modes will still work */
 367                 DH_free(dh_params);
 368                 dh_params = NULL;
 369         }
 370         return true;
 371 }
 372
 373
 374 #endif
 375 static bool
 376 ConnSSL_Init_SSL(CONNECTION *c)
 377 {
 378         int ret;
 379         assert(c != NULL);
 380 #ifdef HAVE_LIBSSL
 381         assert(ssl_ctx);
 382         if (!ssl_ctx)   /* NULL when library initialization failed */
 383                 return false;
 384
 385         assert(c->ssl_state.ssl == NULL);
 386
 387         c->ssl_state.ssl = SSL_new(ssl_ctx);
 388         if (!c->ssl_state.ssl) {
 389                 LogOpenSSLError("SSL_new()", NULL);
 390                 return false;
 391         }
 392
 393         ret = SSL_set_fd(c->ssl_state.ssl, c->sock);
 394         if (ret != 1) {
 395                 LogOpenSSLError("SSL_set_fd()", NULL);
 396                 ConnSSL_Free(c);
 397                 return false;
 398         }
 399 #endif
 400 #ifdef HAVE_LIBGNUTLS
 401         ret = gnutls_set_default_priority(c->ssl_state.gnutls_session);
 402         if (ret < 0) {
 403                 Log(LOG_ERR, "gnutls_set_default_priority: %s", gnutls_strerror(ret));
 404                 ConnSSL_Free(c);
 405         }
 406         /*
 407          * The intermediate (long) cast is here to avoid a warning like:
 408          * "cast to pointer from integer of different size" on 64-bit platforms.
 409          * There doesn't seem to be an alternate GNUTLS API we could use instead, see e.g.
 410          * http://www.mail-archive.com/help-gnutls@gnu.org/msg00286.html
 411          */
 412         gnutls_transport_set_ptr(c->ssl_state.gnutls_session, (gnutls_transport_ptr_t) (long) c->sock);
 413         ret = gnutls_credentials_set(c->ssl_state.gnutls_session, GNUTLS_CRD_CERTIFICATE, x509_cred);
 414         if (ret < 0) {
 415                 Log(LOG_ERR, "gnutls_credentials_set: %s", gnutls_strerror(ret));
 416                 ConnSSL_Free(c);
 417         }
 418         gnutls_dh_set_prime_bits(c->ssl_state.gnutls_session, DH_BITS);
 419 #endif
 420         Conn_OPTION_ADD(c, CONN_SSL);
 421         return true;
 422 }
 423
 424
 425 bool
 426 ConnSSL_PrepareConnect(CONNECTION *c, UNUSED CONF_SERVER *s)
 427 {
 428         bool ret;
 429 #ifdef HAVE_LIBGNUTLS
 430         int err;
 431 #endif
 432         assert(c != NULL);
 433         assert(s != NULL);
 434 #ifdef HAVE_LIBGNUTLS
 435         err = gnutls_init(&c->ssl_state.gnutls_session, GNUTLS_CLIENT);
 436         if (err) {
 437                 Log(LOG_ERR, "gnutls_init: %s", gnutls_strerror(err));
 438                 return false;
 439         }
 440 #endif
 441         ret = ConnSSL_Init_SSL(c);
 442         if (!ret)
 443                 return false;
 444         Conn_OPTION_ADD(c, CONN_SSL_CONNECT);
 445 #ifdef HAVE_LIBSSL
 446         assert(c->ssl_state.ssl);
 447         SSL_set_verify(c->ssl_state.ssl, SSL_VERIFY_NONE, NULL);
 448 #endif
 449         return true;
 450 }
 451
 452
 453 /*
 454   Check an Handle Error return code after failed calls to ssl/tls functions.
 455   OpenSSL:
 456   SSL_connect(), SSL_accept(), SSL_do_handshake(), SSL_read(), SSL_peek(), or SSL_write() on ssl.
 457   GNUTLS:
 458   gnutlsssl_read(), gnutls_write() or gnutls_handshake().
 459   Return: -1 on fatal error, 0 if we can try again later.
 460  */
 461 static int
 462 ConnSSL_HandleError( CONNECTION *c, const int code, const char *fname )
 463 {
 464 #ifdef HAVE_LIBSSL
 465         int ret = SSL_ERROR_SYSCALL;
 466         unsigned long sslerr;
 467         int real_errno = errno;
 468
 469         assert( fname );
 470
 471         ret = SSL_get_error(c->ssl_state.ssl, code);
 472         switch (ret) {
 473         case SSL_ERROR_WANT_READ:
 474                 io_event_del(c->sock, IO_WANTWRITE);
 475                 Conn_OPTION_ADD(c, CONN_SSL_WANT_READ);
 476                 return 0;       /* try again later */
 477         case SSL_ERROR_WANT_WRITE:
 478                 io_event_del(c->sock, IO_WANTREAD);
 479                 Conn_OPTION_ADD(c, CONN_SSL_WANT_WRITE); /* fall through */
 480         case SSL_ERROR_NONE:
 481                 return 0;       /* try again later */
 482         case SSL_ERROR_ZERO_RETURN:     /* TLS/SSL Connection was shut down */
 483                 LogOpenSSLError("TLS/SSL Connection shutdown", fname);
 484                 break;
 485         /*
 486         SSL_ERROR_WANT_CONNECT, SSL_ERROR_WANT_ACCEPT, SSL_ERROR_WANT_X509_LOOKUP
 487         */
 488         case SSL_ERROR_SYSCALL:
 489                 sslerr = ERR_get_error();
 490                 if (sslerr) {
 491                         Log( LOG_ERR, "%s: %s", fname, ERR_error_string(sslerr, NULL ));
 492                 } else {
 493
 494                         switch (code) { /* EOF that violated protocol */
 495                         case 0:
 496                                 Log(LOG_ERR, "%s: Client Disconnected", fname );
 497                                 break;
 498                         case -1: /* low level socket I/O error, check errno */
 499                                 Log(LOG_ERR, "%s: %s", fname, strerror(real_errno));
 500                         }
 501                 }
 502                 break;
 503         case SSL_ERROR_SSL:
 504                 LogOpenSSLError("TLS/SSL Protocol Error", fname);
 505                 break;
 506         default:
 507                 Log( LOG_ERR, "%s: Unknown error %d!", fname, ret);
 508         }
 509         ConnSSL_Free(c);
 510         return -1;
 511 #endif
 512 #ifdef HAVE_LIBGNUTLS
 513         switch (code) {
 514         case GNUTLS_E_AGAIN:
 515         case GNUTLS_E_INTERRUPTED:
 516         if (gnutls_record_get_direction(c->ssl_state.gnutls_session)) { /* need write */
 517                 io_event_del(c->sock, IO_WANTREAD);
 518                 Conn_OPTION_ADD(c, CONN_SSL_WANT_WRITE); /* fall through */
 519                 break;
 520         } else { /* need read */
 521                 io_event_del(c->sock, IO_WANTWRITE);
 522                 Conn_OPTION_ADD(c, CONN_SSL_WANT_READ);
 523                 break;
 524         }
 525         default:
 526                 assert(code < 0);
 527                 if (gnutls_error_is_fatal(code)) {
 528                         Log(LOG_ERR, "%s: %s", fname, gnutls_strerror(code));
 529                         ConnSSL_Free(c);
 530                         return -1;
 531                 }
 532         }
 533         return 0;
 534 #endif
 535 }
 536
 537
 538 static void
 539 ConnSSL_LogCertInfo( CONNECTION *c )
 540 {
 541 #ifdef HAVE_LIBSSL
 542         SSL *ssl = c->ssl_state.ssl;
 543
 544         assert( c );
 545         assert( ssl );
 546
 547         Log( LOG_INFO, "New %s connection using cipher %s on socket %d",
 548                 SSL_get_version(ssl), SSL_get_cipher(ssl), c->sock);
 549 #endif
 550 #ifdef HAVE_LIBGNUTLS
 551         gnutls_session_t sess = c->ssl_state.gnutls_session;
 552         gnutls_cipher_algorithm_t cipher = gnutls_cipher_get(sess);
 553
 554         Log( LOG_INFO, "New %s connection using cipher %s-%s on socket %d",
 555                 gnutls_protocol_get_name(gnutls_protocol_get_version(sess)),
 556                 gnutls_cipher_get_name(cipher), gnutls_mac_get_name(gnutls_mac_get(sess)), c->sock);
 557 #endif
 558 }
 559
 560
 561 /*
 562  Accept incoming SSL connection.
 563  Return Values:
 564          1: SSL Connection established
 565          0: try again
 566         -1: SSL Connection not established due to fatal error.
 567 */
 568 int
 569 ConnSSL_Accept( CONNECTION *c )
 570 {
 571         assert(c != NULL);
 572 #ifdef HAVE_LIBSSL
 573         if (!c->ssl_state.ssl) {
 574 #endif
 575 #ifdef HAVE_LIBGNUTLS
 576         if (!Conn_OPTION_ISSET(c, CONN_SSL)) {
 577                 int err = gnutls_init(&c->ssl_state.gnutls_session, GNUTLS_SERVER);
 578                 if (err) {
 579                         Log(LOG_ERR, "gnutls_init: %s", gnutls_strerror(err));
 580                         return false;
 581                 }
 582 #endif
 583                 LogDebug("ConnSSL_Accept: Initializing SSL data");
 584                 if (!ConnSSL_Init_SSL(c))
 585                         return -1;
 586         }
 587         return ConnectAccept(c, false );
 588 }
 589
 590
 591 int
 592 ConnSSL_Connect( CONNECTION *c )
 593 {
 594         assert(c != NULL);
 595 #ifdef HAVE_LIBSSL
 596         assert(c->ssl_state.ssl);
 597 #endif
 598 #ifdef HAVE_LIBGNUTLS
 599         assert(Conn_OPTION_ISSET(c, CONN_SSL));
 600 #endif
 601         return ConnectAccept(c, true);
 602 }
 603
 604
 605 /* accept/connect wrapper. if connect is true, connect to peer, otherwise wait for incoming connection */
 606 static int
 607 ConnectAccept( CONNECTION *c, bool connect)
 608 {
 609         int ret;
 610 #ifdef HAVE_LIBSSL
 611         SSL *ssl = c->ssl_state.ssl;
 612         assert(ssl != NULL);
 613
 614         ret = connect ? SSL_connect(ssl) : SSL_accept(ssl);
 615         if (1 != ret)
 616                 return ConnSSL_HandleError(c, ret, connect ? "SSL_connect": "SSL_accept");
 617 #endif
 618 #ifdef HAVE_LIBGNUTLS
 619         (void) connect;
 620         assert(Conn_OPTION_ISSET(c, CONN_SSL));
 621         ret = gnutls_handshake(c->ssl_state.gnutls_session);
 622         if (ret)
 623                 return ConnSSL_HandleError(c, ret, "gnutls_handshake");
 624 #endif /* _GNUTLS */
 625         Conn_OPTION_DEL(c, (CONN_SSL_WANT_WRITE|CONN_SSL_WANT_READ|CONN_SSL_CONNECT));
 626         ConnSSL_LogCertInfo(c);
 627         return 1;
 628 }
 629
 630
 631 ssize_t
 632 ConnSSL_Write(CONNECTION *c, const void *buf, size_t count)
 633 {
 634         ssize_t bw;
 635
 636         Conn_OPTION_DEL(c, CONN_SSL_WANT_WRITE|CONN_SSL_WANT_READ);
 637
 638         assert(count > 0);
 639 #ifdef HAVE_LIBSSL
 640         bw = (ssize_t) SSL_write(c->ssl_state.ssl, buf, count);
 641 #endif
 642 #ifdef HAVE_LIBGNUTLS
 643         bw = gnutls_write(c->ssl_state.gnutls_session, buf, count);
 644 #endif
 645         if ( bw > 0 ) return bw;
 646         if (ConnSSL_HandleError( c, bw, "ConnSSL_Write") == 0)
 647                 errno = EAGAIN; /* try again */
 648         return -1;
 649 }
 650
 651
 652 ssize_t
 653 ConnSSL_Read(CONNECTION *c, void * buf, size_t count)
 654 {
 655         ssize_t br;
 656
 657         Conn_OPTION_DEL(c, CONN_SSL_WANT_WRITE|CONN_SSL_WANT_READ);
 658 #ifdef HAVE_LIBSSL
 659         br = (ssize_t) SSL_read(c->ssl_state.ssl, buf, count);
 660         if (br > 0)     /* on EOF we have to call ConnSSL_HandleError(), see SSL_read(3) */
 661                 return br;
 662 #endif
 663 #ifdef HAVE_LIBGNUTLS
 664         br = gnutls_read(c->ssl_state.gnutls_session, buf, count);
 665         if (br >= 0)    /* on EOF we must _not_ call ConnSSL_HandleError, see gnutls_record_recv(3) */
 666                 return br;
 667 #endif
 668         /* error on read: switch ConnSSL_HandleError() return values -> 0 is "try again", so return -1 and set EAGAIN */
 669         if (ConnSSL_HandleError(c, br, "ConnSSL_Read") == 0) {
 670                 errno = EAGAIN;
 671                 return -1;
 672         }
 673         return 0;
 674 }
 675
 676
 677 bool
 678 ConnSSL_GetCipherInfo(CONNECTION *c, char *buf, size_t len)
 679 {
 680 #ifdef HAVE_LIBSSL
 681         char *nl;
 682
 683         SSL *ssl;
 684         assert(c != NULL);
 685         assert(len >= 128);
 686         ssl = c->ssl_state.ssl;
 687         if (!ssl)
 688                 return false;
 689         *buf = 0;
 690         SSL_CIPHER_description(SSL_get_current_cipher(ssl), buf, len);
 691         nl = strchr(buf, '\n');
 692         if (nl)
 693                 *nl = 0;
 694         return true;
 695 #endif
 696 #ifdef HAVE_LIBGNUTLS
 697         assert(c != NULL);
 698         assert(len >= 128);
 699         if (Conn_OPTION_ISSET(c, CONN_SSL)) {
 700                 const char *name_cipher, *name_mac, *name_proto, *name_keyexchange;
 701                 unsigned keysize;
 702
 703                 gnutls_session_t sess = c->ssl_state.gnutls_session;
 704                 gnutls_cipher_algorithm_t cipher = gnutls_cipher_get(sess);
 705                 name_cipher = gnutls_cipher_get_name(cipher);
 706                 name_mac = gnutls_mac_get_name(gnutls_mac_get(sess));
 707                 keysize = gnutls_cipher_get_key_size(cipher) * 8;
 708                 name_proto = gnutls_protocol_get_name(gnutls_protocol_get_version(sess));
 709                 name_keyexchange = gnutls_kx_get_name(gnutls_kx_get(sess));
 710
 711                 return snprintf(buf, len, "%s-%s%15s Kx=%s      Enc=%s(%u) Mac=%s",
 712                         name_cipher, name_mac, name_proto, name_keyexchange, name_cipher, keysize, name_mac) > 0;
 713         }
 714         return false;
 715 #endif
 716 }
 717
 718
 719 #endif /* SSL_SUPPORT */
 720 /* -eof- */
 721
 722