nsswitch/wb_common.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    winbind client common code
   5
   6    Copyright (C) Tim Potter 2000
   7    Copyright (C) Andrew Tridgell 2000
   8    Copyright (C) Andrew Bartlett 2002
   9    Copyright (C) Matthew Newton 2015
  10
  11
  12    This library is free software; you can redistribute it and/or
  13    modify it under the terms of the GNU Lesser General Public
  14    License as published by the Free Software Foundation; either
  15    version 3 of the License, or (at your option) any later version.
  16
  17    This library is distributed in the hope that it will be useful,
  18    but WITHOUT ANY WARRANTY; without even the implied warranty of
  19    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  20    Library General Public License for more details.
  21
  22    You should have received a copy of the GNU Lesser General Public License
  23    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  24 */
  25
  26 #include "replace.h"
  27 #include "system/select.h"
  28 #include "winbind_client.h"
  29
  30 #ifdef HAVE_PTHREAD_H
  31 #include <pthread.h>
  32 #endif
  33
  34 static char client_name[32];
  35
  36 /* Global context */
  37
  38 struct winbindd_context {
  39         int winbindd_fd;        /* winbind file descriptor */
  40         bool is_privileged;     /* using the privileged socket? */
  41         pid_t our_pid;          /* calling process pid */
  42 };
  43
  44 #ifdef HAVE_PTHREAD
  45 static pthread_mutex_t wb_global_ctx_mutex = PTHREAD_MUTEX_INITIALIZER;
  46 #endif
  47
  48 static struct winbindd_context *get_wb_global_ctx(void)
  49 {
  50         static struct winbindd_context wb_global_ctx = {
  51                 .winbindd_fd = -1,
  52                 .is_privileged = false,
  53                 .our_pid = 0
  54         };
  55
  56 #ifdef HAVE_PTHREAD
  57         pthread_mutex_lock(&wb_global_ctx_mutex);
  58 #endif
  59         return &wb_global_ctx;
  60 }
  61
  62 static void put_wb_global_ctx(void)
  63 {
  64 #ifdef HAVE_PTHREAD
  65         pthread_mutex_unlock(&wb_global_ctx_mutex);
  66 #endif
  67         return;
  68 }
  69
  70 void winbind_set_client_name(const char *name)
  71 {
  72         if (name == NULL || strlen(name) == 0) {
  73                 return;
  74         }
  75
  76         (void)snprintf(client_name, sizeof(client_name), "%s", name);
  77 }
  78
  79 static const char *winbind_get_client_name(void)
  80 {
  81         if (client_name[0] == '\0') {
  82                 const char *progname = getprogname();
  83                 int len;
  84
  85                 if (progname == NULL) {
  86                         progname = "<unknown>";
  87                 }
  88
  89                 len = snprintf(client_name,
  90                                sizeof(client_name),
  91                                "%s",
  92                                progname);
  93                 if (len <= 0) {
  94                         return progname;
  95                 }
  96         }
  97
  98         return client_name;
  99 }
 100
 101 /* Initialise a request structure */
 102
 103 static void winbindd_init_request(struct winbindd_request *request,
 104                                   int request_type)
 105 {
 106         request->length = sizeof(struct winbindd_request);
 107
 108         request->cmd = (enum winbindd_cmd)request_type;
 109         request->pid = getpid();
 110
 111         (void)snprintf(request->client_name,
 112                        sizeof(request->client_name),
 113                        "%s",
 114                        winbind_get_client_name());
 115 }
 116
 117 /* Initialise a response structure */
 118
 119 static void init_response(struct winbindd_response *response)
 120 {
 121         /* Initialise return value */
 122
 123         response->result = WINBINDD_ERROR;
 124 }
 125
 126 /* Close established socket */
 127
 128 static void winbind_close_sock(struct winbindd_context *ctx)
 129 {
 130         if (!ctx) {
 131                 return;
 132         }
 133
 134         if (ctx->winbindd_fd != -1) {
 135                 close(ctx->winbindd_fd);
 136                 ctx->winbindd_fd = -1;
 137         }
 138 }
 139
 140 /* Destructor for global context to ensure fd is closed */
 141
 142 #ifdef HAVE_DESTRUCTOR_ATTRIBUTE
 143 __attribute__((destructor))
 144 #elif defined (HAVE_PRAGMA_FINI)
 145 #pragma fini (winbind_destructor)
 146 #endif
 147 static void winbind_destructor(void)
 148 {
 149         struct winbindd_context *ctx;
 150
 151         ctx = get_wb_global_ctx();
 152         winbind_close_sock(ctx);
 153         put_wb_global_ctx();
 154 }
 155
 156 #define CONNECT_TIMEOUT 30
 157
 158 /* Make sure socket handle isn't stdin, stdout or stderr */
 159 #define RECURSION_LIMIT 3
 160
 161 static int make_nonstd_fd_internals(int fd, int limit /* Recursion limiter */)
 162 {
 163         int new_fd;
 164         if (fd >= 0 && fd <= 2) {
 165 #ifdef F_DUPFD
 166                 if ((new_fd = fcntl(fd, F_DUPFD, 3)) == -1) {
 167                         return -1;
 168                 }
 169                 /* Paranoia */
 170                 if (new_fd < 3) {
 171                         close(new_fd);
 172                         return -1;
 173                 }
 174                 close(fd);
 175                 return new_fd;
 176 #else
 177                 if (limit <= 0)
 178                         return -1;
 179
 180                 new_fd = dup(fd);
 181                 if (new_fd == -1)
 182                         return -1;
 183
 184                 /* use the program stack to hold our list of FDs to close */
 185                 new_fd = make_nonstd_fd_internals(new_fd, limit - 1);
 186                 close(fd);
 187                 return new_fd;
 188 #endif
 189         }
 190         return fd;
 191 }
 192
 193 /****************************************************************************
 194  Set a fd into blocking/nonblocking mode. Uses POSIX O_NONBLOCK if available,
 195  else
 196  if SYSV use O_NDELAY
 197  if BSD use FNDELAY
 198  Set close on exec also.
 199 ****************************************************************************/
 200
 201 static int make_safe_fd(int fd)
 202 {
 203         int result, flags;
 204         int new_fd = make_nonstd_fd_internals(fd, RECURSION_LIMIT);
 205         if (new_fd == -1) {
 206                 close(fd);
 207                 return -1;
 208         }
 209
 210         /* Socket should be nonblocking. */
 211 #ifdef O_NONBLOCK
 212 #define FLAG_TO_SET O_NONBLOCK
 213 #else
 214 #ifdef SYSV
 215 #define FLAG_TO_SET O_NDELAY
 216 #else /* BSD */
 217 #define FLAG_TO_SET FNDELAY
 218 #endif
 219 #endif
 220
 221         if ((flags = fcntl(new_fd, F_GETFL)) == -1) {
 222                 close(new_fd);
 223                 return -1;
 224         }
 225
 226         flags |= FLAG_TO_SET;
 227         if (fcntl(new_fd, F_SETFL, flags) == -1) {
 228                 close(new_fd);
 229                 return -1;
 230         }
 231
 232 #undef FLAG_TO_SET
 233
 234         /* Socket should be closed on exec() */
 235 #ifdef FD_CLOEXEC
 236         result = flags = fcntl(new_fd, F_GETFD, 0);
 237         if (flags >= 0) {
 238                 flags |= FD_CLOEXEC;
 239                 result = fcntl( new_fd, F_SETFD, flags );
 240         }
 241         if (result < 0) {
 242                 close(new_fd);
 243                 return -1;
 244         }
 245 #endif
 246         return new_fd;
 247 }
 248
 249 /**
 250  * @internal
 251  *
 252  * @brief Check if we talk to the privileged pipe which should be owned by root.
 253  *
 254  * This checks if we have uid_wrapper running and if this is the case it will
 255  * allow one to connect to the winbind privileged pipe even it is not owned by root.
 256  *
 257  * @param[in]  uid      The uid to check if we can safely talk to the pipe.
 258  *
 259  * @return              If we have access it returns true, else false.
 260  */
 261 static bool winbind_privileged_pipe_is_root(uid_t uid)
 262 {
 263         if (uid == 0) {
 264                 return true;
 265         }
 266
 267         if (uid_wrapper_enabled()) {
 268                 return true;
 269         }
 270
 271         return false;
 272 }
 273
 274 /* Connect to winbindd socket */
 275
 276 static int winbind_named_pipe_sock(const char *dir)
 277 {
 278         struct sockaddr_un sunaddr;
 279         struct stat st;
 280         int fd;
 281         int wait_time;
 282         int slept;
 283         int ret;
 284
 285         /* Check permissions on unix socket directory */
 286
 287         if (lstat(dir, &st) == -1) {
 288                 errno = ENOENT;
 289                 return -1;
 290         }
 291
 292         /*
 293          * This tells us that the pipe is owned by a privileged
 294          * process, as we will be sending passwords to it.
 295          */
 296         if (!S_ISDIR(st.st_mode) ||
 297             !winbind_privileged_pipe_is_root(st.st_uid)) {
 298                 errno = ENOENT;
 299                 return -1;
 300         }
 301
 302         /* Connect to socket */
 303
 304         sunaddr = (struct sockaddr_un) { .sun_family = AF_UNIX };
 305
 306         ret = snprintf(sunaddr.sun_path, sizeof(sunaddr.sun_path),
 307                        "%s/%s", dir, WINBINDD_SOCKET_NAME);
 308         if ((ret == -1) || (ret >= sizeof(sunaddr.sun_path))) {
 309                 errno = ENAMETOOLONG;
 310                 return -1;
 311         }
 312
 313         /* If socket file doesn't exist, don't bother trying to connect
 314            with retry.  This is an attempt to make the system usable when
 315            the winbindd daemon is not running. */
 316
 317         if (lstat(sunaddr.sun_path, &st) == -1) {
 318                 errno = ENOENT;
 319                 return -1;
 320         }
 321
 322         /* Check permissions on unix socket file */
 323
 324         /*
 325          * This tells us that the pipe is owned by a privileged
 326          * process, as we will be sending passwords to it.
 327          */
 328         if (!S_ISSOCK(st.st_mode) ||
 329             !winbind_privileged_pipe_is_root(st.st_uid)) {
 330                 errno = ENOENT;
 331                 return -1;
 332         }
 333
 334         /* Connect to socket */
 335
 336         if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) {
 337                 return -1;
 338         }
 339
 340         /* Set socket non-blocking and close on exec. */
 341
 342         if ((fd = make_safe_fd( fd)) == -1) {
 343                 return fd;
 344         }
 345
 346         for (wait_time = 0; connect(fd, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) == -1;
 347                         wait_time += slept) {
 348                 struct pollfd pfd;
 349                 int connect_errno = 0;
 350                 socklen_t errnosize;
 351
 352                 if (wait_time >= CONNECT_TIMEOUT)
 353                         goto error_out;
 354
 355                 switch (errno) {
 356                         case EINPROGRESS:
 357                                 pfd.fd = fd;
 358                                 pfd.events = POLLOUT;
 359
 360                                 ret = poll(&pfd, 1, (CONNECT_TIMEOUT - wait_time) * 1000);
 361
 362                                 if (ret > 0) {
 363                                         errnosize = sizeof(connect_errno);
 364
 365                                         ret = getsockopt(fd, SOL_SOCKET,
 366                                                         SO_ERROR, &connect_errno, &errnosize);
 367
 368                                         if (ret >= 0 && connect_errno == 0) {
 369                                                 /* Connect succeed */
 370                                                 goto out;
 371                                         }
 372                                 }
 373
 374                                 slept = CONNECT_TIMEOUT;
 375                                 break;
 376                         case EAGAIN:
 377                                 slept = rand() % 3 + 1;
 378                                 sleep(slept);
 379                                 break;
 380                         default:
 381                                 goto error_out;
 382                 }
 383
 384         }
 385
 386   out:
 387
 388         return fd;
 389
 390   error_out:
 391
 392         close(fd);
 393         return -1;
 394 }
 395
 396 static const char *winbindd_socket_dir(void)
 397 {
 398         if (nss_wrapper_enabled()) {
 399                 const char *env_dir;
 400
 401                 env_dir = getenv("SELFTEST_WINBINDD_SOCKET_DIR");
 402                 if (env_dir != NULL) {
 403                         return env_dir;
 404                 }
 405         }
 406
 407         return WINBINDD_SOCKET_DIR;
 408 }
 409
 410 /* Connect to winbindd socket */
 411
 412 static int winbind_open_pipe_sock(struct winbindd_context *ctx,
 413                                   int recursing, int need_priv)
 414 {
 415 #ifdef HAVE_UNIXSOCKET
 416         struct winbindd_request request;
 417         struct winbindd_response response;
 418
 419         ZERO_STRUCT(request);
 420         ZERO_STRUCT(response);
 421
 422         if (!ctx) {
 423                 return -1;
 424         }
 425
 426         if (ctx->our_pid != getpid()) {
 427                 winbind_close_sock(ctx);
 428                 ctx->our_pid = getpid();
 429         }
 430
 431         if ((need_priv != 0) && !ctx->is_privileged) {
 432                 winbind_close_sock(ctx);
 433         }
 434
 435         if (ctx->winbindd_fd != -1) {
 436                 return ctx->winbindd_fd;
 437         }
 438
 439         if (recursing) {
 440                 return -1;
 441         }
 442
 443         ctx->winbindd_fd = winbind_named_pipe_sock(winbindd_socket_dir());
 444
 445         if (ctx->winbindd_fd == -1) {
 446                 return -1;
 447         }
 448
 449         ctx->is_privileged = false;
 450
 451         /* version-check the socket */
 452
 453         request.wb_flags = WBFLAG_RECURSE;
 454         if ((winbindd_request_response(ctx, WINBINDD_INTERFACE_VERSION, &request,
 455                                        &response) != NSS_STATUS_SUCCESS) ||
 456             (response.data.interface_version != WINBIND_INTERFACE_VERSION)) {
 457                 winbind_close_sock(ctx);
 458                 return -1;
 459         }
 460
 461         if (need_priv == 0) {
 462                 return ctx->winbindd_fd;
 463         }
 464
 465         /* try and get priv pipe */
 466
 467         request.wb_flags = WBFLAG_RECURSE;
 468
 469         /* Note that response needs to be initialized to avoid
 470          * crashing on clean up after WINBINDD_PRIV_PIPE_DIR call failed
 471          * as interface version (from the first request) returned as a fstring,
 472          * thus response.extra_data.data will not be NULL even though
 473          * winbindd response did not write over it due to a failure */
 474         ZERO_STRUCT(response);
 475         if (winbindd_request_response(ctx, WINBINDD_PRIV_PIPE_DIR, &request,
 476                                       &response) == NSS_STATUS_SUCCESS) {
 477                 int fd;
 478                 fd = winbind_named_pipe_sock((char *)response.extra_data.data);
 479                 if (fd != -1) {
 480                         close(ctx->winbindd_fd);
 481                         ctx->winbindd_fd = fd;
 482                         ctx->is_privileged = true;
 483                 }
 484
 485                 SAFE_FREE(response.extra_data.data);
 486         }
 487
 488         if (!ctx->is_privileged) {
 489                 return -1;
 490         }
 491
 492         return ctx->winbindd_fd;
 493 #else
 494         return -1;
 495 #endif /* HAVE_UNIXSOCKET */
 496 }
 497
 498 /* Write data to winbindd socket */
 499
 500 static int winbind_write_sock(struct winbindd_context *ctx, void *buffer,
 501                               int count, int recursing, int need_priv)
 502 {
 503         int fd, result, nwritten;
 504
 505         /* Open connection to winbind daemon */
 506
 507  restart:
 508
 509         fd = winbind_open_pipe_sock(ctx, recursing, need_priv);
 510         if (fd == -1) {
 511                 errno = ENOENT;
 512                 return -1;
 513         }
 514
 515         /* Write data to socket */
 516
 517         nwritten = 0;
 518
 519         while(nwritten < count) {
 520                 struct pollfd pfd;
 521                 int ret;
 522
 523                 /* Catch pipe close on other end by checking if a read()
 524                    call would not block by calling poll(). */
 525
 526                 pfd.fd = fd;
 527                 pfd.events = POLLIN|POLLOUT|POLLHUP;
 528
 529                 ret = poll(&pfd, 1, -1);
 530                 if (ret == -1) {
 531                         winbind_close_sock(ctx);
 532                         return -1;                   /* poll error */
 533                 }
 534
 535                 /* Write should be OK if fd not available for reading */
 536
 537                 if ((ret == 1) && (pfd.revents & (POLLIN|POLLHUP|POLLERR))) {
 538
 539                         /* Pipe has closed on remote end */
 540
 541                         winbind_close_sock(ctx);
 542                         goto restart;
 543                 }
 544
 545                 /* Do the write */
 546
 547                 result = write(fd, (char *)buffer + nwritten,
 548                                count - nwritten);
 549
 550                 if ((result == -1) || (result == 0)) {
 551
 552                         /* Write failed */
 553
 554                         winbind_close_sock(ctx);
 555                         return -1;
 556                 }
 557
 558                 nwritten += result;
 559         }
 560
 561         return nwritten;
 562 }
 563
 564 /* Read data from winbindd socket */
 565
 566 static int winbind_read_sock(struct winbindd_context *ctx,
 567                              void *buffer, int count)
 568 {
 569         int fd;
 570         int nread = 0;
 571         int total_time = 0;
 572
 573         fd = winbind_open_pipe_sock(ctx, false, false);
 574         if (fd == -1) {
 575                 return -1;
 576         }
 577
 578         /* Read data from socket */
 579         while(nread < count) {
 580                 struct pollfd pfd;
 581                 int ret;
 582
 583                 /* Catch pipe close on other end by checking if a read()
 584                    call would not block by calling poll(). */
 585
 586                 pfd.fd = fd;
 587                 pfd.events = POLLIN|POLLHUP;
 588
 589                 /* Wait for 5 seconds for a reply. May need to parameterise this... */
 590
 591                 ret = poll(&pfd, 1, 5000);
 592                 if (ret == -1) {
 593                         winbind_close_sock(ctx);
 594                         return -1;                   /* poll error */
 595                 }
 596
 597                 if (ret == 0) {
 598                         /* Not ready for read yet... */
 599                         if (total_time >= 300) {
 600                                 /* Timeout */
 601                                 winbind_close_sock(ctx);
 602                                 return -1;
 603                         }
 604                         total_time += 5;
 605                         continue;
 606                 }
 607
 608                 if ((ret == 1) && (pfd.revents & (POLLIN|POLLHUP|POLLERR))) {
 609
 610                         /* Do the Read */
 611
 612                         int result = read(fd, (char *)buffer + nread,
 613                               count - nread);
 614
 615                         if ((result == -1) || (result == 0)) {
 616
 617                                 /* Read failed.  I think the only useful thing we
 618                                    can do here is just return -1 and fail since the
 619                                    transaction has failed half way through. */
 620
 621                                 winbind_close_sock(ctx);
 622                                 return -1;
 623                         }
 624
 625                         nread += result;
 626
 627                 }
 628         }
 629
 630         return nread;
 631 }
 632
 633 /* Read reply */
 634
 635 static int winbindd_read_reply(struct winbindd_context *ctx,
 636                                struct winbindd_response *response)
 637 {
 638         int result1, result2 = 0;
 639
 640         if (!response) {
 641                 return -1;
 642         }
 643
 644         /* Read fixed length response */
 645
 646         result1 = winbind_read_sock(ctx, response,
 647                                     sizeof(struct winbindd_response));
 648
 649         /* We actually send the pointer value of the extra_data field from
 650            the server.  This has no meaning in the client's address space
 651            so we clear it out. */
 652
 653         response->extra_data.data = NULL;
 654
 655         if (result1 == -1) {
 656                 return -1;
 657         }
 658
 659         if (response->length < sizeof(struct winbindd_response)) {
 660                 return -1;
 661         }
 662
 663         /* Read variable length response */
 664
 665         if (response->length > sizeof(struct winbindd_response)) {
 666                 int extra_data_len = response->length -
 667                         sizeof(struct winbindd_response);
 668
 669                 /* Mallocate memory for extra data */
 670
 671                 if (!(response->extra_data.data = malloc(extra_data_len))) {
 672                         return -1;
 673                 }
 674
 675                 result2 = winbind_read_sock(ctx, response->extra_data.data,
 676                                             extra_data_len);
 677                 if (result2 == -1) {
 678                         winbindd_free_response(response);
 679                         return -1;
 680                 }
 681         }
 682
 683         /* Return total amount of data read */
 684
 685         return result1 + result2;
 686 }
 687
 688 /*
 689  * send simple types of requests
 690  */
 691
 692 static NSS_STATUS winbindd_send_request(
 693         struct winbindd_context *ctx,
 694         int req_type,
 695         int need_priv,
 696         struct winbindd_request *request)
 697 {
 698         struct winbindd_request lrequest;
 699
 700         /* Check for our tricky environment variable */
 701
 702         if (winbind_env_set()) {
 703                 return NSS_STATUS_NOTFOUND;
 704         }
 705
 706         if (!request) {
 707                 ZERO_STRUCT(lrequest);
 708                 request = &lrequest;
 709         }
 710
 711         /* Fill in request and send down pipe */
 712
 713         winbindd_init_request(request, req_type);
 714
 715         if (winbind_write_sock(ctx, request, sizeof(*request),
 716                                request->wb_flags & WBFLAG_RECURSE,
 717                                need_priv) == -1)
 718         {
 719                 /* Set ENOENT for consistency.  Required by some apps */
 720                 errno = ENOENT;
 721
 722                 return NSS_STATUS_UNAVAIL;
 723         }
 724
 725         if ((request->extra_len != 0) &&
 726             (winbind_write_sock(ctx, request->extra_data.data,
 727                                 request->extra_len,
 728                                 request->wb_flags & WBFLAG_RECURSE,
 729                                 need_priv) == -1))
 730         {
 731                 /* Set ENOENT for consistency.  Required by some apps */
 732                 errno = ENOENT;
 733
 734                 return NSS_STATUS_UNAVAIL;
 735         }
 736
 737         return NSS_STATUS_SUCCESS;
 738 }
 739
 740 /*
 741  * Get results from winbindd request
 742  */
 743
 744 static NSS_STATUS winbindd_get_response(struct winbindd_context *ctx,
 745                                         struct winbindd_response *response)
 746 {
 747         struct winbindd_response lresponse;
 748
 749         if (!response) {
 750                 ZERO_STRUCT(lresponse);
 751                 response = &lresponse;
 752         }
 753
 754         init_response(response);
 755
 756         /* Wait for reply */
 757         if (winbindd_read_reply(ctx, response) == -1) {
 758                 /* Set ENOENT for consistency.  Required by some apps */
 759                 errno = ENOENT;
 760
 761                 return NSS_STATUS_UNAVAIL;
 762         }
 763
 764         /* Throw away extra data if client didn't request it */
 765         if (response == &lresponse) {
 766                 winbindd_free_response(response);
 767         }
 768
 769         /* Copy reply data from socket */
 770         if (response->result != WINBINDD_OK) {
 771                 return NSS_STATUS_NOTFOUND;
 772         }
 773
 774         return NSS_STATUS_SUCCESS;
 775 }
 776
 777 /* Handle simple types of requests */
 778
 779 NSS_STATUS winbindd_request_response(struct winbindd_context *ctx,
 780                                      int req_type,
 781                                      struct winbindd_request *request,
 782                                      struct winbindd_response *response)
 783 {
 784         NSS_STATUS status = NSS_STATUS_UNAVAIL;
 785         bool release_global_ctx = false;
 786
 787         if (ctx == NULL) {
 788                 ctx = get_wb_global_ctx();
 789                 release_global_ctx = true;
 790         }
 791
 792         status = winbindd_send_request(ctx, req_type, 0, request);
 793         if (status != NSS_STATUS_SUCCESS) {
 794                 goto out;
 795         }
 796         status = winbindd_get_response(ctx, response);
 797
 798 out:
 799         if (release_global_ctx) {
 800                 put_wb_global_ctx();
 801         }
 802         return status;
 803 }
 804
 805 NSS_STATUS winbindd_priv_request_response(struct winbindd_context *ctx,
 806                                           int req_type,
 807                                           struct winbindd_request *request,
 808                                           struct winbindd_response *response)
 809 {
 810         NSS_STATUS status = NSS_STATUS_UNAVAIL;
 811         bool release_global_ctx = false;
 812
 813         if (ctx == NULL) {
 814                 ctx = get_wb_global_ctx();
 815                 release_global_ctx = true;
 816         }
 817
 818         status = winbindd_send_request(ctx, req_type, 1, request);
 819         if (status != NSS_STATUS_SUCCESS) {
 820                 goto out;
 821         }
 822         status = winbindd_get_response(ctx, response);
 823
 824 out:
 825         if (release_global_ctx) {
 826                 put_wb_global_ctx();
 827         }
 828         return status;
 829 }
 830
 831 /* Create and free winbindd context */
 832
 833 struct winbindd_context *winbindd_ctx_create(void)
 834 {
 835         struct winbindd_context *ctx;
 836
 837         ctx = calloc(1, sizeof(struct winbindd_context));
 838
 839         if (!ctx) {
 840                 return NULL;
 841         }
 842
 843         ctx->winbindd_fd = -1;
 844
 845         return ctx;
 846 }
 847
 848 void winbindd_ctx_free(struct winbindd_context *ctx)
 849 {
 850         winbind_close_sock(ctx);
 851         free(ctx);
 852 }