source/lib/tls/tls.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    transport layer security handling code
   5
   6    Copyright (C) Andrew Tridgell 2004-2005
   7    Copyright (C) Stefan Metzmacher 2004
   8    Copyright (C) Andrew Bartlett 2006
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 3 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  22 */
  23
  24 #include "includes.h"
  25 #include "lib/events/events.h"
  26 #include "lib/socket/socket.h"
  27 #include "lib/tls/tls.h"
  28 #include "param/param.h"
  29
  30 #if ENABLE_GNUTLS
  31 #include "gnutls/gnutls.h"
  32
  33 #define DH_BITS 1024
  34
  35 #if defined(HAVE_GNUTLS_DATUM) && !defined(HAVE_GNUTLS_DATUM_T)
  36 typedef gnutls_datum gnutls_datum_t;
  37 #endif
  38
  39 /* hold persistent tls data */
  40 struct tls_params {
  41         gnutls_certificate_credentials x509_cred;
  42         gnutls_dh_params dh_params;
  43         BOOL tls_enabled;
  44 };
  45 #endif
  46
  47 /* hold per connection tls data */
  48 struct tls_context {
  49         struct socket_context *socket;
  50         struct fd_event *fde;
  51         BOOL tls_enabled;
  52 #if ENABLE_GNUTLS
  53         gnutls_session session;
  54         BOOL done_handshake;
  55         BOOL have_first_byte;
  56         uint8_t first_byte;
  57         BOOL tls_detect;
  58         const char *plain_chars;
  59         BOOL output_pending;
  60         gnutls_certificate_credentials xcred;
  61         BOOL interrupted;
  62 #endif
  63 };
  64
  65 BOOL tls_enabled(struct socket_context *sock)
  66 {
  67         struct tls_context *tls;
  68         if (!sock) {
  69                 return False;
  70         }
  71         if (strcmp(sock->backend_name, "tls") != 0) {
  72                 return False;
  73         }
  74         tls = talloc_get_type(sock->private_data, struct tls_context);
  75         if (!tls) {
  76                 return False;
  77         }
  78         return tls->tls_enabled;
  79 }
  80
  81
  82 #if ENABLE_GNUTLS
  83
  84 static const struct socket_ops tls_socket_ops;
  85
  86 static NTSTATUS tls_socket_init(struct socket_context *sock)
  87 {
  88         switch (sock->type) {
  89         case SOCKET_TYPE_STREAM:
  90                 break;
  91         default:
  92                 return NT_STATUS_INVALID_PARAMETER;
  93         }
  94
  95         sock->backend_name = "tls";
  96
  97         return NT_STATUS_OK;
  98 }
  99
 100 #define TLSCHECK(call) do { \
 101         ret = call; \
 102         if (ret < 0) { \
 103                 DEBUG(0,("TLS %s - %s\n", #call, gnutls_strerror(ret))); \
 104                 goto failed; \
 105         } \
 106 } while (0)
 107
 108
 109 /*
 110   callback for reading from a socket
 111 */
 112 static ssize_t tls_pull(gnutls_transport_ptr ptr, void *buf, size_t size)
 113 {
 114         struct tls_context *tls = talloc_get_type(ptr, struct tls_context);
 115         NTSTATUS status;
 116         size_t nread;
 117
 118         if (tls->have_first_byte) {
 119                 *(uint8_t *)buf = tls->first_byte;
 120                 tls->have_first_byte = False;
 121                 return 1;
 122         }
 123
 124         status = socket_recv(tls->socket, buf, size, &nread);
 125         if (NT_STATUS_EQUAL(status, NT_STATUS_END_OF_FILE)) {
 126                 return 0;
 127         }
 128         if (NT_STATUS_IS_ERR(status)) {
 129                 EVENT_FD_NOT_READABLE(tls->fde);
 130                 EVENT_FD_NOT_WRITEABLE(tls->fde);
 131                 errno = EBADF;
 132                 return -1;
 133         }
 134         if (!NT_STATUS_IS_OK(status)) {
 135                 EVENT_FD_READABLE(tls->fde);
 136                 errno = EAGAIN;
 137                 return -1;
 138         }
 139         if (tls->output_pending) {
 140                 EVENT_FD_WRITEABLE(tls->fde);
 141         }
 142         if (size != nread) {
 143                 EVENT_FD_READABLE(tls->fde);
 144         }
 145         return nread;
 146 }
 147
 148 /*
 149   callback for writing to a socket
 150 */
 151 static ssize_t tls_push(gnutls_transport_ptr ptr, const void *buf, size_t size)
 152 {
 153         struct tls_context *tls = talloc_get_type(ptr, struct tls_context);
 154         NTSTATUS status;
 155         size_t nwritten;
 156         DATA_BLOB b;
 157
 158         if (!tls->tls_enabled) {
 159                 return size;
 160         }
 161
 162         b.data = discard_const(buf);
 163         b.length = size;
 164
 165         status = socket_send(tls->socket, &b, &nwritten);
 166         if (NT_STATUS_EQUAL(status, STATUS_MORE_ENTRIES)) {
 167                 errno = EAGAIN;
 168                 return -1;
 169         }
 170         if (!NT_STATUS_IS_OK(status)) {
 171                 EVENT_FD_WRITEABLE(tls->fde);
 172                 return -1;
 173         }
 174         if (size != nwritten) {
 175                 EVENT_FD_WRITEABLE(tls->fde);
 176         }
 177         return nwritten;
 178 }
 179
 180 /*
 181   destroy a tls session
 182  */
 183 static int tls_destructor(struct tls_context *tls)
 184 {
 185         int ret;
 186         ret = gnutls_bye(tls->session, GNUTLS_SHUT_WR);
 187         if (ret < 0) {
 188                 DEBUG(0,("TLS gnutls_bye failed - %s\n", gnutls_strerror(ret)));
 189         }
 190         return 0;
 191 }
 192
 193
 194 /*
 195   possibly continue the handshake process
 196 */
 197 static NTSTATUS tls_handshake(struct tls_context *tls)
 198 {
 199         int ret;
 200
 201         if (tls->done_handshake) {
 202                 return NT_STATUS_OK;
 203         }
 204
 205         ret = gnutls_handshake(tls->session);
 206         if (ret == GNUTLS_E_INTERRUPTED || ret == GNUTLS_E_AGAIN) {
 207                 if (gnutls_record_get_direction(tls->session) == 1) {
 208                         EVENT_FD_WRITEABLE(tls->fde);
 209                 }
 210                 return STATUS_MORE_ENTRIES;
 211         }
 212         if (ret < 0) {
 213                 DEBUG(0,("TLS gnutls_handshake failed - %s\n", gnutls_strerror(ret)));
 214                 return NT_STATUS_UNEXPECTED_NETWORK_ERROR;
 215         }
 216         tls->done_handshake = True;
 217         return NT_STATUS_OK;
 218 }
 219
 220 /*
 221   possibly continue an interrupted operation
 222 */
 223 static NTSTATUS tls_interrupted(struct tls_context *tls)
 224 {
 225         int ret;
 226
 227         if (!tls->interrupted) {
 228                 return NT_STATUS_OK;
 229         }
 230         if (gnutls_record_get_direction(tls->session) == 1) {
 231                 ret = gnutls_record_send(tls->session, NULL, 0);
 232         } else {
 233                 ret = gnutls_record_recv(tls->session, NULL, 0);
 234         }
 235         if (ret == GNUTLS_E_INTERRUPTED || ret == GNUTLS_E_AGAIN) {
 236                 return STATUS_MORE_ENTRIES;
 237         }
 238         tls->interrupted = False;
 239         return NT_STATUS_OK;
 240 }
 241
 242 /*
 243   see how many bytes are pending on the connection
 244 */
 245 static NTSTATUS tls_socket_pending(struct socket_context *sock, size_t *npending)
 246 {
 247         struct tls_context *tls = talloc_get_type(sock->private_data, struct tls_context);
 248         if (!tls->tls_enabled || tls->tls_detect) {
 249                 return socket_pending(tls->socket, npending);
 250         }
 251         *npending = gnutls_record_check_pending(tls->session);
 252         if (*npending == 0) {
 253                 NTSTATUS status = socket_pending(tls->socket, npending);
 254                 if (*npending == 0) {
 255                         /* seems to be a gnutls bug */
 256                         (*npending) = 100;
 257                 }
 258                 return status;
 259         }
 260         return NT_STATUS_OK;
 261 }
 262
 263 /*
 264   receive data either by tls or normal socket_recv
 265 */
 266 static NTSTATUS tls_socket_recv(struct socket_context *sock, void *buf,
 267                                 size_t wantlen, size_t *nread)
 268 {
 269         int ret;
 270         NTSTATUS status;
 271         struct tls_context *tls = talloc_get_type(sock->private_data, struct tls_context);
 272
 273         if (tls->tls_enabled && tls->tls_detect) {
 274                 status = socket_recv(tls->socket, &tls->first_byte, 1, nread);
 275                 NT_STATUS_NOT_OK_RETURN(status);
 276                 if (*nread == 0) return NT_STATUS_OK;
 277                 tls->tls_detect = False;
 278                 /* look for the first byte of a valid HTTP operation */
 279                 if (strchr(tls->plain_chars, tls->first_byte)) {
 280                         /* not a tls link */
 281                         tls->tls_enabled = False;
 282                         *(uint8_t *)buf = tls->first_byte;
 283                         return NT_STATUS_OK;
 284                 }
 285                 tls->have_first_byte = True;
 286         }
 287
 288         if (!tls->tls_enabled) {
 289                 return socket_recv(tls->socket, buf, wantlen, nread);
 290         }
 291
 292         status = tls_handshake(tls);
 293         NT_STATUS_NOT_OK_RETURN(status);
 294
 295         status = tls_interrupted(tls);
 296         NT_STATUS_NOT_OK_RETURN(status);
 297
 298         ret = gnutls_record_recv(tls->session, buf, wantlen);
 299         if (ret == GNUTLS_E_INTERRUPTED || ret == GNUTLS_E_AGAIN) {
 300                 if (gnutls_record_get_direction(tls->session) == 1) {
 301                         EVENT_FD_WRITEABLE(tls->fde);
 302                 }
 303                 tls->interrupted = True;
 304                 return STATUS_MORE_ENTRIES;
 305         }
 306         if (ret < 0) {
 307                 return NT_STATUS_UNEXPECTED_NETWORK_ERROR;
 308         }
 309         *nread = ret;
 310         return NT_STATUS_OK;
 311 }
 312
 313
 314 /*
 315   send data either by tls or normal socket_recv
 316 */
 317 static NTSTATUS tls_socket_send(struct socket_context *sock,
 318                                 const DATA_BLOB *blob, size_t *sendlen)
 319 {
 320         NTSTATUS status;
 321         int ret;
 322         struct tls_context *tls = talloc_get_type(sock->private_data, struct tls_context);
 323
 324         if (!tls->tls_enabled) {
 325                 return socket_send(tls->socket, blob, sendlen);
 326         }
 327
 328         status = tls_handshake(tls);
 329         NT_STATUS_NOT_OK_RETURN(status);
 330
 331         status = tls_interrupted(tls);
 332         NT_STATUS_NOT_OK_RETURN(status);
 333
 334         ret = gnutls_record_send(tls->session, blob->data, blob->length);
 335         if (ret == GNUTLS_E_INTERRUPTED || ret == GNUTLS_E_AGAIN) {
 336                 if (gnutls_record_get_direction(tls->session) == 1) {
 337                         EVENT_FD_WRITEABLE(tls->fde);
 338                 }
 339                 tls->interrupted = True;
 340                 return STATUS_MORE_ENTRIES;
 341         }
 342         if (ret < 0) {
 343                 DEBUG(0,("gnutls_record_send of %d failed - %s\n", (int)blob->length, gnutls_strerror(ret)));
 344                 return NT_STATUS_UNEXPECTED_NETWORK_ERROR;
 345         }
 346         *sendlen = ret;
 347         tls->output_pending = (ret < blob->length);
 348         return NT_STATUS_OK;
 349 }
 350
 351
 352 /*
 353   initialise global tls state
 354 */
 355 struct tls_params *tls_initialise(TALLOC_CTX *mem_ctx)
 356 {
 357         struct tls_params *params;
 358         int ret;
 359         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 360         const char *keyfile = private_path(tmp_ctx, lp_tls_keyfile(global_loadparm));
 361         const char *certfile = private_path(tmp_ctx, lp_tls_certfile(global_loadparm));
 362         const char *cafile = private_path(tmp_ctx, lp_tls_cafile(global_loadparm));
 363         const char *crlfile = private_path(tmp_ctx, lp_tls_crlfile(global_loadparm));
 364         const char *dhpfile = private_path(tmp_ctx, lp_tls_dhpfile(global_loadparm));
 365         void tls_cert_generate(TALLOC_CTX *, const char *, const char *, const char *);
 366
 367         params = talloc(mem_ctx, struct tls_params);
 368         if (params == NULL) {
 369                 talloc_free(tmp_ctx);
 370                 return NULL;
 371         }
 372
 373         if (!lp_tls_enabled(global_loadparm) || keyfile == NULL || *keyfile == 0) {
 374                 params->tls_enabled = False;
 375                 talloc_free(tmp_ctx);
 376                 return params;
 377         }
 378
 379         if (!file_exist(cafile)) {
 380                 tls_cert_generate(params, keyfile, certfile, cafile);
 381         }
 382
 383         ret = gnutls_global_init();
 384         if (ret < 0) goto init_failed;
 385
 386         gnutls_certificate_allocate_credentials(&params->x509_cred);
 387         if (ret < 0) goto init_failed;
 388
 389         if (cafile && *cafile) {
 390                 ret = gnutls_certificate_set_x509_trust_file(params->x509_cred, cafile,
 391                                                              GNUTLS_X509_FMT_PEM);
 392                 if (ret < 0) {
 393                         DEBUG(0,("TLS failed to initialise cafile %s\n", cafile));
 394                         goto init_failed;
 395                 }
 396         }
 397
 398         if (crlfile && *crlfile) {
 399                 ret = gnutls_certificate_set_x509_crl_file(params->x509_cred,
 400                                                            crlfile,
 401                                                            GNUTLS_X509_FMT_PEM);
 402                 if (ret < 0) {
 403                         DEBUG(0,("TLS failed to initialise crlfile %s\n", crlfile));
 404                         goto init_failed;
 405                 }
 406         }
 407
 408         ret = gnutls_certificate_set_x509_key_file(params->x509_cred,
 409                                                    certfile, keyfile,
 410                                                    GNUTLS_X509_FMT_PEM);
 411         if (ret < 0) {
 412                 DEBUG(0,("TLS failed to initialise certfile %s and keyfile %s\n",
 413                          certfile, keyfile));
 414                 goto init_failed;
 415         }
 416
 417
 418         ret = gnutls_dh_params_init(&params->dh_params);
 419         if (ret < 0) goto init_failed;
 420
 421         if (dhpfile && *dhpfile) {
 422                 gnutls_datum_t dhparms;
 423                 size_t size;
 424                 dhparms.data = (uint8_t *)file_load(dhpfile, &size, mem_ctx);
 425
 426                 if (!dhparms.data) {
 427                         DEBUG(0,("Failed to read DH Parms from %s\n", dhpfile));
 428                         goto init_failed;
 429                 }
 430                 dhparms.size = size;
 431
 432                 ret = gnutls_dh_params_import_pkcs3(params->dh_params, &dhparms, GNUTLS_X509_FMT_PEM);
 433                 if (ret < 0) goto init_failed;
 434         } else {
 435                 ret = gnutls_dh_params_generate2(params->dh_params, DH_BITS);
 436                 if (ret < 0) goto init_failed;
 437         }
 438
 439         gnutls_certificate_set_dh_params(params->x509_cred, params->dh_params);
 440
 441         params->tls_enabled = True;
 442
 443         talloc_free(tmp_ctx);
 444         return params;
 445
 446 init_failed:
 447         DEBUG(0,("GNUTLS failed to initialise - %s\n", gnutls_strerror(ret)));
 448         params->tls_enabled = False;
 449         talloc_free(tmp_ctx);
 450         return params;
 451 }
 452
 453
 454 /*
 455   setup for a new connection
 456 */
 457 struct socket_context *tls_init_server(struct tls_params *params,
 458                                        struct socket_context *socket,
 459                                        struct fd_event *fde,
 460                                        const char *plain_chars)
 461 {
 462         struct tls_context *tls;
 463         int ret;
 464         struct socket_context *new_sock;
 465         NTSTATUS nt_status;
 466
 467         nt_status = socket_create_with_ops(socket, &tls_socket_ops, &new_sock,
 468                                            SOCKET_TYPE_STREAM,
 469                                            socket->flags | SOCKET_FLAG_ENCRYPT);
 470         if (!NT_STATUS_IS_OK(nt_status)) {
 471                 return NULL;
 472         }
 473
 474         tls = talloc(new_sock, struct tls_context);
 475         if (tls == NULL) {
 476                 return NULL;
 477         }
 478
 479         tls->socket          = socket;
 480         tls->fde             = fde;
 481         if (talloc_reference(tls, fde) == NULL) {
 482                 talloc_free(new_sock);
 483                 return NULL;
 484         }
 485         if (talloc_reference(tls, socket) == NULL) {
 486                 talloc_free(new_sock);
 487                 return NULL;
 488         }
 489
 490         new_sock->private_data    = tls;
 491
 492         if (!params->tls_enabled) {
 493                 talloc_free(new_sock);
 494                 return NULL;
 495         }
 496
 497         TLSCHECK(gnutls_init(&tls->session, GNUTLS_SERVER));
 498
 499         talloc_set_destructor(tls, tls_destructor);
 500
 501         TLSCHECK(gnutls_set_default_priority(tls->session));
 502         TLSCHECK(gnutls_credentials_set(tls->session, GNUTLS_CRD_CERTIFICATE,
 503                                         params->x509_cred));
 504         gnutls_certificate_server_set_request(tls->session, GNUTLS_CERT_REQUEST);
 505         gnutls_dh_set_prime_bits(tls->session, DH_BITS);
 506         gnutls_transport_set_ptr(tls->session, (gnutls_transport_ptr)tls);
 507         gnutls_transport_set_pull_function(tls->session, (gnutls_pull_func)tls_pull);
 508         gnutls_transport_set_push_function(tls->session, (gnutls_push_func)tls_push);
 509         gnutls_transport_set_lowat(tls->session, 0);
 510
 511         tls->plain_chars = plain_chars;
 512         if (plain_chars) {
 513                 tls->tls_detect = True;
 514         } else {
 515                 tls->tls_detect = False;
 516         }
 517
 518         tls->output_pending  = False;
 519         tls->done_handshake  = False;
 520         tls->have_first_byte = False;
 521         tls->tls_enabled     = True;
 522         tls->interrupted     = False;
 523
 524         new_sock->state = SOCKET_STATE_SERVER_CONNECTED;
 525
 526         return new_sock;
 527
 528 failed:
 529         DEBUG(0,("TLS init connection failed - %s\n", gnutls_strerror(ret)));
 530         talloc_free(new_sock);
 531         return NULL;
 532 }
 533
 534
 535 /*
 536   setup for a new client connection
 537 */
 538 struct socket_context *tls_init_client(struct socket_context *socket,
 539                                        struct fd_event *fde)
 540 {
 541         struct tls_context *tls;
 542         int ret = 0;
 543         const int cert_type_priority[] = { GNUTLS_CRT_X509, GNUTLS_CRT_OPENPGP, 0 };
 544         char *cafile;
 545         struct socket_context *new_sock;
 546         NTSTATUS nt_status;
 547
 548         nt_status = socket_create_with_ops(socket, &tls_socket_ops, &new_sock,
 549                                            SOCKET_TYPE_STREAM,
 550                                            socket->flags | SOCKET_FLAG_ENCRYPT);
 551         if (!NT_STATUS_IS_OK(nt_status)) {
 552                 return NULL;
 553         }
 554
 555         tls = talloc(new_sock, struct tls_context);
 556         if (tls == NULL) return NULL;
 557
 558         tls->socket          = socket;
 559         tls->fde             = fde;
 560         if (talloc_reference(tls, fde) == NULL) {
 561                 return NULL;
 562         }
 563         if (talloc_reference(tls, socket) == NULL) {
 564                 return NULL;
 565         }
 566         new_sock->private_data    = tls;
 567
 568         cafile = private_path(tls, lp_tls_cafile(global_loadparm));
 569         if (!cafile || !*cafile) {
 570                 goto failed;
 571         }
 572
 573         gnutls_global_init();
 574
 575         gnutls_certificate_allocate_credentials(&tls->xcred);
 576         gnutls_certificate_set_x509_trust_file(tls->xcred, cafile, GNUTLS_X509_FMT_PEM);
 577         talloc_free(cafile);
 578         TLSCHECK(gnutls_init(&tls->session, GNUTLS_CLIENT));
 579         TLSCHECK(gnutls_set_default_priority(tls->session));
 580         gnutls_certificate_type_set_priority(tls->session, cert_type_priority);
 581         TLSCHECK(gnutls_credentials_set(tls->session, GNUTLS_CRD_CERTIFICATE, tls->xcred));
 582
 583         talloc_set_destructor(tls, tls_destructor);
 584
 585         gnutls_transport_set_ptr(tls->session, (gnutls_transport_ptr)tls);
 586         gnutls_transport_set_pull_function(tls->session, (gnutls_pull_func)tls_pull);
 587         gnutls_transport_set_push_function(tls->session, (gnutls_push_func)tls_push);
 588         gnutls_transport_set_lowat(tls->session, 0);
 589         tls->tls_detect = False;
 590
 591         tls->output_pending  = False;
 592         tls->done_handshake  = False;
 593         tls->have_first_byte = False;
 594         tls->tls_enabled     = True;
 595         tls->interrupted     = False;
 596
 597         new_sock->state = SOCKET_STATE_CLIENT_CONNECTED;
 598
 599         return new_sock;
 600
 601 failed:
 602         DEBUG(0,("TLS init connection failed - %s\n", gnutls_strerror(ret)));
 603         tls->tls_enabled = False;
 604         return new_sock;
 605 }
 606
 607 static NTSTATUS tls_socket_set_option(struct socket_context *sock, const char *option, const char *val)
 608 {
 609         set_socket_options(socket_get_fd(sock), option);
 610         return NT_STATUS_OK;
 611 }
 612
 613 static char *tls_socket_get_peer_name(struct socket_context *sock, TALLOC_CTX *mem_ctx)
 614 {
 615         struct tls_context *tls = talloc_get_type(sock->private_data, struct tls_context);
 616         return socket_get_peer_name(tls->socket, mem_ctx);
 617 }
 618
 619 static struct socket_address *tls_socket_get_peer_addr(struct socket_context *sock, TALLOC_CTX *mem_ctx)
 620 {
 621         struct tls_context *tls = talloc_get_type(sock->private_data, struct tls_context);
 622         return socket_get_peer_addr(tls->socket, mem_ctx);
 623 }
 624
 625 static struct socket_address *tls_socket_get_my_addr(struct socket_context *sock, TALLOC_CTX *mem_ctx)
 626 {
 627         struct tls_context *tls = talloc_get_type(sock->private_data, struct tls_context);
 628         return socket_get_my_addr(tls->socket, mem_ctx);
 629 }
 630
 631 static int tls_socket_get_fd(struct socket_context *sock)
 632 {
 633         struct tls_context *tls = talloc_get_type(sock->private_data, struct tls_context);
 634         return socket_get_fd(tls->socket);
 635 }
 636
 637 static const struct socket_ops tls_socket_ops = {
 638         .name                   = "tls",
 639         .fn_init                = tls_socket_init,
 640         .fn_recv                = tls_socket_recv,
 641         .fn_send                = tls_socket_send,
 642         .fn_pending             = tls_socket_pending,
 643
 644         .fn_set_option          = tls_socket_set_option,
 645
 646         .fn_get_peer_name       = tls_socket_get_peer_name,
 647         .fn_get_peer_addr       = tls_socket_get_peer_addr,
 648         .fn_get_my_addr         = tls_socket_get_my_addr,
 649         .fn_get_fd              = tls_socket_get_fd
 650 };
 651
 652 BOOL tls_support(struct tls_params *params)
 653 {
 654         return params->tls_enabled;
 655 }
 656
 657 #else
 658
 659 /* for systems without tls we just fail the operations, and the caller
 660  * will retain the original socket */
 661
 662 struct tls_params *tls_initialise(TALLOC_CTX *mem_ctx)
 663 {
 664         return talloc_new(mem_ctx);
 665 }
 666
 667 /*
 668   setup for a new connection
 669 */
 670 struct socket_context *tls_init_server(struct tls_params *params,
 671                                     struct socket_context *socket,
 672                                     struct fd_event *fde,
 673                                     const char *plain_chars)
 674 {
 675         return NULL;
 676 }
 677
 678
 679 /*
 680   setup for a new client connection
 681 */
 682 struct socket_context *tls_init_client(struct socket_context *socket,
 683                                        struct fd_event *fde)
 684 {
 685         return NULL;
 686 }
 687
 688 BOOL tls_support(struct tls_params *params)
 689 {
 690         return False;
 691 }
 692
 693 #endif
 694