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