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