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 /* Free a response structure */
  71
  72 void winbindd_free_response(struct winbindd_response *response)
  73 {
  74         /* Free any allocated extra_data */
  75
  76         if (response)
  77                 SAFE_FREE(response->extra_data.data);
  78 }
  79
  80 void winbind_set_client_name(const char *name)
  81 {
  82         if (name == NULL || strlen(name) == 0) {
  83                 return;
  84         }
  85
  86         (void)snprintf(client_name, sizeof(client_name), "%s", name);
  87 }
  88
  89 static const char *winbind_get_client_name(void)
  90 {
  91         if (client_name[0] == '\0') {
  92                 const char *progname = getprogname();
  93                 int len;
  94
  95                 if (progname == NULL) {
  96                         progname = "<unknown>";
  97                 }
  98
  99                 len = snprintf(client_name,
 100                                sizeof(client_name),
 101                                "%s",
 102                                progname);
 103                 if (len <= 0) {
 104                         return progname;
 105                 }
 106         }
 107
 108         return client_name;
 109 }
 110
 111 /* Initialise a request structure */
 112
 113 static void winbindd_init_request(struct winbindd_request *request,
 114                                   int request_type)
 115 {
 116         request->length = sizeof(struct winbindd_request);
 117
 118         request->cmd = (enum winbindd_cmd)request_type;
 119         request->pid = getpid();
 120
 121         (void)snprintf(request->client_name,
 122                        sizeof(request->client_name),
 123                        "%s",
 124                        winbind_get_client_name());
 125 }
 126
 127 /* Initialise a response structure */
 128
 129 static void init_response(struct winbindd_response *response)
 130 {
 131         /* Initialise return value */
 132
 133         response->result = WINBINDD_ERROR;
 134 }
 135
 136 /* Close established socket */
 137
 138 static void winbind_close_sock(struct winbindd_context *ctx)
 139 {
 140         if (!ctx) {
 141                 return;
 142         }
 143
 144         if (ctx->winbindd_fd != -1) {
 145                 close(ctx->winbindd_fd);
 146                 ctx->winbindd_fd = -1;
 147         }
 148 }
 149
 150 /* Destructor for global context to ensure fd is closed */
 151
 152 #ifdef HAVE_DESTRUCTOR_ATTRIBUTE
 153 __attribute__((destructor))
 154 #endif
 155 static void winbind_destructor(void)
 156 {
 157         struct winbindd_context *ctx;
 158
 159         ctx = get_wb_global_ctx();
 160         winbind_close_sock(ctx);
 161         put_wb_global_ctx();
 162 }
 163
 164 #define CONNECT_TIMEOUT 30
 165
 166 /* Make sure socket handle isn't stdin, stdout or stderr */
 167 #define RECURSION_LIMIT 3
 168
 169 static int make_nonstd_fd_internals(int fd, int limit /* Recursion limiter */)
 170 {
 171         int new_fd;
 172         if (fd >= 0 && fd <= 2) {
 173 #ifdef F_DUPFD
 174                 if ((new_fd = fcntl(fd, F_DUPFD, 3)) == -1) {
 175                         return -1;
 176                 }
 177                 /* Paranoia */
 178                 if (new_fd < 3) {
 179                         close(new_fd);
 180                         return -1;
 181                 }
 182                 close(fd);
 183                 return new_fd;
 184 #else
 185                 if (limit <= 0)
 186                         return -1;
 187
 188                 new_fd = dup(fd);
 189                 if (new_fd == -1)
 190                         return -1;
 191
 192                 /* use the program stack to hold our list of FDs to close */
 193                 new_fd = make_nonstd_fd_internals(new_fd, limit - 1);
 194                 close(fd);
 195                 return new_fd;
 196 #endif
 197         }
 198         return fd;
 199 }
 200
 201 /****************************************************************************
 202  Set a fd into blocking/nonblocking mode. Uses POSIX O_NONBLOCK if available,
 203  else
 204  if SYSV use O_NDELAY
 205  if BSD use FNDELAY
 206  Set close on exec also.
 207 ****************************************************************************/
 208
 209 static int make_safe_fd(int fd)
 210 {
 211         int result, flags;
 212         int new_fd = make_nonstd_fd_internals(fd, RECURSION_LIMIT);
 213         if (new_fd == -1) {
 214                 close(fd);
 215                 return -1;
 216         }
 217
 218         /* Socket should be nonblocking. */
 219 #ifdef O_NONBLOCK
 220 #define FLAG_TO_SET O_NONBLOCK
 221 #else
 222 #ifdef SYSV
 223 #define FLAG_TO_SET O_NDELAY
 224 #else /* BSD */
 225 #define FLAG_TO_SET FNDELAY
 226 #endif
 227 #endif
 228
 229         if ((flags = fcntl(new_fd, F_GETFL)) == -1) {
 230                 close(new_fd);
 231                 return -1;
 232         }
 233
 234         flags |= FLAG_TO_SET;
 235         if (fcntl(new_fd, F_SETFL, flags) == -1) {
 236                 close(new_fd);
 237                 return -1;
 238         }
 239
 240 #undef FLAG_TO_SET
 241
 242         /* Socket should be closed on exec() */
 243 #ifdef FD_CLOEXEC
 244         result = flags = fcntl(new_fd, F_GETFD, 0);
 245         if (flags >= 0) {
 246                 flags |= FD_CLOEXEC;
 247                 result = fcntl( new_fd, F_SETFD, flags );
 248         }
 249         if (result < 0) {
 250                 close(new_fd);
 251                 return -1;
 252         }
 253 #endif
 254         return new_fd;
 255 }
 256
 257 /**
 258  * @internal
 259  *
 260  * @brief Check if we talk to the priviliged pipe which should be owned by root.
 261  *
 262  * This checks if we have uid_wrapper running and if this is the case it will
 263  * allow one to connect to the winbind privileged pipe even it is not owned by root.
 264  *
 265  * @param[in]  uid      The uid to check if we can safely talk to the pipe.
 266  *
 267  * @return              If we have access it returns true, else false.
 268  */
 269 static bool winbind_privileged_pipe_is_root(uid_t uid)
 270 {
 271         if (uid == 0) {
 272                 return true;
 273         }
 274
 275         if (uid_wrapper_enabled()) {
 276                 return true;
 277         }
 278
 279         return false;
 280 }
 281
 282 /* Connect to winbindd socket */
 283
 284 static int winbind_named_pipe_sock(const char *dir)
 285 {
 286         struct sockaddr_un sunaddr;
 287         struct stat st;
 288         int fd;
 289         int wait_time;
 290         int slept;
 291         int ret;
 292
 293         /* Check permissions on unix socket directory */
 294
 295         if (lstat(dir, &st) == -1) {
 296                 errno = ENOENT;
 297                 return -1;
 298         }
 299
 300         /*
 301          * This tells us that the pipe is owned by a privileged
 302          * process, as we will be sending passwords to it.
 303          */
 304         if (!S_ISDIR(st.st_mode) ||
 305             !winbind_privileged_pipe_is_root(st.st_uid)) {
 306                 errno = ENOENT;
 307                 return -1;
 308         }
 309
 310         /* Connect to socket */
 311
 312         sunaddr = (struct sockaddr_un) { .sun_family = AF_UNIX };
 313
 314         ret = snprintf(sunaddr.sun_path, sizeof(sunaddr.sun_path),
 315                        "%s/%s", dir, WINBINDD_SOCKET_NAME);
 316         if ((ret == -1) || (ret >= sizeof(sunaddr.sun_path))) {
 317                 errno = ENAMETOOLONG;
 318                 return -1;
 319         }
 320
 321         /* If socket file doesn't exist, don't bother trying to connect
 322            with retry.  This is an attempt to make the system usable when
 323            the winbindd daemon is not running. */
 324
 325         if (lstat(sunaddr.sun_path, &st) == -1) {
 326                 errno = ENOENT;
 327                 return -1;
 328         }
 329
 330         /* Check permissions on unix socket file */
 331
 332         /*
 333          * This tells us that the pipe is owned by a privileged
 334          * process, as we will be sending passwords to it.
 335          */
 336         if (!S_ISSOCK(st.st_mode) ||
 337             !winbind_privileged_pipe_is_root(st.st_uid)) {
 338                 errno = ENOENT;
 339                 return -1;
 340         }
 341
 342         /* Connect to socket */
 343
 344         if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) {
 345                 return -1;
 346         }
 347
 348         /* Set socket non-blocking and close on exec. */
 349
 350         if ((fd = make_safe_fd( fd)) == -1) {
 351                 return fd;
 352         }
 353
 354         for (wait_time = 0; connect(fd, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) == -1;
 355                         wait_time += slept) {
 356                 struct pollfd pfd;
 357                 int connect_errno = 0;
 358                 socklen_t errnosize;
 359
 360                 if (wait_time >= CONNECT_TIMEOUT)
 361                         goto error_out;
 362
 363                 switch (errno) {
 364                         case EINPROGRESS:
 365                                 pfd.fd = fd;
 366                                 pfd.events = POLLOUT;
 367
 368                                 ret = poll(&pfd, 1, (CONNECT_TIMEOUT - wait_time) * 1000);
 369
 370                                 if (ret > 0) {
 371                                         errnosize = sizeof(connect_errno);
 372
 373                                         ret = getsockopt(fd, SOL_SOCKET,
 374                                                         SO_ERROR, &connect_errno, &errnosize);
 375
 376                                         if (ret >= 0 && connect_errno == 0) {
 377                                                 /* Connect succeed */
 378                                                 goto out;
 379                                         }
 380                                 }
 381
 382                                 slept = CONNECT_TIMEOUT;
 383                                 break;
 384                         case EAGAIN:
 385                                 slept = rand() % 3 + 1;
 386                                 sleep(slept);
 387                                 break;
 388                         default:
 389                                 goto error_out;
 390                 }
 391
 392         }
 393
 394   out:
 395
 396         return fd;
 397
 398   error_out:
 399
 400         close(fd);
 401         return -1;
 402 }
 403
 404 static const char *winbindd_socket_dir(void)
 405 {
 406         if (nss_wrapper_enabled()) {
 407                 const char *env_dir;
 408
 409                 env_dir = getenv("SELFTEST_WINBINDD_SOCKET_DIR");
 410                 if (env_dir != NULL) {
 411                         return env_dir;
 412                 }
 413         }
 414
 415         return WINBINDD_SOCKET_DIR;
 416 }
 417
 418 /* Connect to winbindd socket */
 419
 420 static int winbind_open_pipe_sock(struct winbindd_context *ctx,
 421                                   int recursing, int need_priv)
 422 {
 423 #ifdef HAVE_UNIXSOCKET
 424         struct winbindd_request request;
 425         struct winbindd_response response;
 426
 427         ZERO_STRUCT(request);
 428         ZERO_STRUCT(response);
 429
 430         if (!ctx) {
 431                 return -1;
 432         }
 433
 434         if (ctx->our_pid != getpid()) {
 435                 winbind_close_sock(ctx);
 436                 ctx->our_pid = getpid();
 437         }
 438
 439         if ((need_priv != 0) && !ctx->is_privileged) {
 440                 winbind_close_sock(ctx);
 441         }
 442
 443         if (ctx->winbindd_fd != -1) {
 444                 return ctx->winbindd_fd;
 445         }
 446
 447         if (recursing) {
 448                 return -1;
 449         }
 450
 451         ctx->winbindd_fd = winbind_named_pipe_sock(winbindd_socket_dir());
 452
 453         if (ctx->winbindd_fd == -1) {
 454                 return -1;
 455         }
 456
 457         ctx->is_privileged = false;
 458
 459         /* version-check the socket */
 460
 461         request.wb_flags = WBFLAG_RECURSE;
 462         if ((winbindd_request_response(ctx, WINBINDD_INTERFACE_VERSION, &request,
 463                                        &response) != NSS_STATUS_SUCCESS) ||
 464             (response.data.interface_version != WINBIND_INTERFACE_VERSION)) {
 465                 winbind_close_sock(ctx);
 466                 return -1;
 467         }
 468
 469         if (need_priv == 0) {
 470                 return ctx->winbindd_fd;
 471         }
 472
 473         /* try and get priv pipe */
 474
 475         request.wb_flags = WBFLAG_RECURSE;
 476
 477         /* Note that response needs to be initialized to avoid
 478          * crashing on clean up after WINBINDD_PRIV_PIPE_DIR call failed
 479          * as interface version (from the first request) returned as a fstring,
 480          * thus response.extra_data.data will not be NULL even though
 481          * winbindd response did not write over it due to a failure */
 482         ZERO_STRUCT(response);
 483         if (winbindd_request_response(ctx, WINBINDD_PRIV_PIPE_DIR, &request,
 484                                       &response) == NSS_STATUS_SUCCESS) {
 485                 int fd;
 486                 fd = winbind_named_pipe_sock((char *)response.extra_data.data);
 487                 if (fd != -1) {
 488                         close(ctx->winbindd_fd);
 489                         ctx->winbindd_fd = fd;
 490                         ctx->is_privileged = true;
 491                 }
 492
 493                 SAFE_FREE(response.extra_data.data);
 494         }
 495
 496         if (!ctx->is_privileged) {
 497                 return -1;
 498         }
 499
 500         return ctx->winbindd_fd;
 501 #else
 502         return -1;
 503 #endif /* HAVE_UNIXSOCKET */
 504 }
 505
 506 /* Write data to winbindd socket */
 507
 508 static int winbind_write_sock(struct winbindd_context *ctx, void *buffer,
 509                               int count, int recursing, int need_priv)
 510 {
 511         int fd, result, nwritten;
 512
 513         /* Open connection to winbind daemon */
 514
 515  restart:
 516
 517         fd = winbind_open_pipe_sock(ctx, recursing, need_priv);
 518         if (fd == -1) {
 519                 errno = ENOENT;
 520                 return -1;
 521         }
 522
 523         /* Write data to socket */
 524
 525         nwritten = 0;
 526
 527         while(nwritten < count) {
 528                 struct pollfd pfd;
 529                 int ret;
 530
 531                 /* Catch pipe close on other end by checking if a read()
 532                    call would not block by calling poll(). */
 533
 534                 pfd.fd = fd;
 535                 pfd.events = POLLIN|POLLOUT|POLLHUP;
 536
 537                 ret = poll(&pfd, 1, -1);
 538                 if (ret == -1) {
 539                         winbind_close_sock(ctx);
 540                         return -1;                   /* poll error */
 541                 }
 542
 543                 /* Write should be OK if fd not available for reading */
 544
 545                 if ((ret == 1) && (pfd.revents & (POLLIN|POLLHUP|POLLERR))) {
 546
 547                         /* Pipe has closed on remote end */
 548
 549                         winbind_close_sock(ctx);
 550                         goto restart;
 551                 }
 552
 553                 /* Do the write */
 554
 555                 result = write(fd, (char *)buffer + nwritten,
 556                                count - nwritten);
 557
 558                 if ((result == -1) || (result == 0)) {
 559
 560                         /* Write failed */
 561
 562                         winbind_close_sock(ctx);
 563                         return -1;
 564                 }
 565
 566                 nwritten += result;
 567         }
 568
 569         return nwritten;
 570 }
 571
 572 /* Read data from winbindd socket */
 573
 574 static int winbind_read_sock(struct winbindd_context *ctx,
 575                              void *buffer, int count)
 576 {
 577         int fd;
 578         int nread = 0;
 579         int total_time = 0;
 580
 581         fd = winbind_open_pipe_sock(ctx, false, false);
 582         if (fd == -1) {
 583                 return -1;
 584         }
 585
 586         /* Read data from socket */
 587         while(nread < count) {
 588                 struct pollfd pfd;
 589                 int ret;
 590
 591                 /* Catch pipe close on other end by checking if a read()
 592                    call would not block by calling poll(). */
 593
 594                 pfd.fd = fd;
 595                 pfd.events = POLLIN|POLLHUP;
 596
 597                 /* Wait for 5 seconds for a reply. May need to parameterise this... */
 598
 599                 ret = poll(&pfd, 1, 5000);
 600                 if (ret == -1) {
 601                         winbind_close_sock(ctx);
 602                         return -1;                   /* poll error */
 603                 }
 604
 605                 if (ret == 0) {
 606                         /* Not ready for read yet... */
 607                         if (total_time >= 300) {
 608                                 /* Timeout */
 609                                 winbind_close_sock(ctx);
 610                                 return -1;
 611                         }
 612                         total_time += 5;
 613                         continue;
 614                 }
 615
 616                 if ((ret == 1) && (pfd.revents & (POLLIN|POLLHUP|POLLERR))) {
 617
 618                         /* Do the Read */
 619
 620                         int result = read(fd, (char *)buffer + nread,
 621                               count - nread);
 622
 623                         if ((result == -1) || (result == 0)) {
 624
 625                                 /* Read failed.  I think the only useful thing we
 626                                    can do here is just return -1 and fail since the
 627                                    transaction has failed half way through. */
 628
 629                                 winbind_close_sock(ctx);
 630                                 return -1;
 631                         }
 632
 633                         nread += result;
 634
 635                 }
 636         }
 637
 638         return nread;
 639 }
 640
 641 /* Read reply */
 642
 643 static int winbindd_read_reply(struct winbindd_context *ctx,
 644                                struct winbindd_response *response)
 645 {
 646         int result1, result2 = 0;
 647
 648         if (!response) {
 649                 return -1;
 650         }
 651
 652         /* Read fixed length response */
 653
 654         result1 = winbind_read_sock(ctx, response,
 655                                     sizeof(struct winbindd_response));
 656
 657         /* We actually send the pointer value of the extra_data field from
 658            the server.  This has no meaning in the client's address space
 659            so we clear it out. */
 660
 661         response->extra_data.data = NULL;
 662
 663         if (result1 == -1) {
 664                 return -1;
 665         }
 666
 667         if (response->length < sizeof(struct winbindd_response)) {
 668                 return -1;
 669         }
 670
 671         /* Read variable length response */
 672
 673         if (response->length > sizeof(struct winbindd_response)) {
 674                 int extra_data_len = response->length -
 675                         sizeof(struct winbindd_response);
 676
 677                 /* Mallocate memory for extra data */
 678
 679                 if (!(response->extra_data.data = malloc(extra_data_len))) {
 680                         return -1;
 681                 }
 682
 683                 result2 = winbind_read_sock(ctx, response->extra_data.data,
 684                                             extra_data_len);
 685                 if (result2 == -1) {
 686                         winbindd_free_response(response);
 687                         return -1;
 688                 }
 689         }
 690
 691         /* Return total amount of data read */
 692
 693         return result1 + result2;
 694 }
 695
 696 /*
 697  * send simple types of requests
 698  */
 699
 700 static NSS_STATUS winbindd_send_request(
 701         struct winbindd_context *ctx,
 702         int req_type,
 703         int need_priv,
 704         struct winbindd_request *request)
 705 {
 706         struct winbindd_request lrequest;
 707
 708         /* Check for our tricky environment variable */
 709
 710         if (winbind_env_set()) {
 711                 return NSS_STATUS_NOTFOUND;
 712         }
 713
 714         if (!request) {
 715                 ZERO_STRUCT(lrequest);
 716                 request = &lrequest;
 717         }
 718
 719         /* Fill in request and send down pipe */
 720
 721         winbindd_init_request(request, req_type);
 722
 723         if (winbind_write_sock(ctx, request, sizeof(*request),
 724                                request->wb_flags & WBFLAG_RECURSE,
 725                                need_priv) == -1)
 726         {
 727                 /* Set ENOENT for consistency.  Required by some apps */
 728                 errno = ENOENT;
 729
 730                 return NSS_STATUS_UNAVAIL;
 731         }
 732
 733         if ((request->extra_len != 0) &&
 734             (winbind_write_sock(ctx, request->extra_data.data,
 735                                 request->extra_len,
 736                                 request->wb_flags & WBFLAG_RECURSE,
 737                                 need_priv) == -1))
 738         {
 739                 /* Set ENOENT for consistency.  Required by some apps */
 740                 errno = ENOENT;
 741
 742                 return NSS_STATUS_UNAVAIL;
 743         }
 744
 745         return NSS_STATUS_SUCCESS;
 746 }
 747
 748 /*
 749  * Get results from winbindd request
 750  */
 751
 752 static NSS_STATUS winbindd_get_response(struct winbindd_context *ctx,
 753                                         struct winbindd_response *response)
 754 {
 755         struct winbindd_response lresponse;
 756
 757         if (!response) {
 758                 ZERO_STRUCT(lresponse);
 759                 response = &lresponse;
 760         }
 761
 762         init_response(response);
 763
 764         /* Wait for reply */
 765         if (winbindd_read_reply(ctx, response) == -1) {
 766                 /* Set ENOENT for consistency.  Required by some apps */
 767                 errno = ENOENT;
 768
 769                 return NSS_STATUS_UNAVAIL;
 770         }
 771
 772         /* Throw away extra data if client didn't request it */
 773         if (response == &lresponse) {
 774                 winbindd_free_response(response);
 775         }
 776
 777         /* Copy reply data from socket */
 778         if (response->result != WINBINDD_OK) {
 779                 return NSS_STATUS_NOTFOUND;
 780         }
 781
 782         return NSS_STATUS_SUCCESS;
 783 }
 784
 785 /* Handle simple types of requests */
 786
 787 NSS_STATUS winbindd_request_response(struct winbindd_context *ctx,
 788                                      int req_type,
 789                                      struct winbindd_request *request,
 790                                      struct winbindd_response *response)
 791 {
 792         NSS_STATUS status = NSS_STATUS_UNAVAIL;
 793         bool release_global_ctx = false;
 794
 795         if (ctx == NULL) {
 796                 ctx = get_wb_global_ctx();
 797                 release_global_ctx = true;
 798         }
 799
 800         status = winbindd_send_request(ctx, req_type, 0, request);
 801         if (status != NSS_STATUS_SUCCESS) {
 802                 goto out;
 803         }
 804         status = winbindd_get_response(ctx, response);
 805
 806 out:
 807         if (release_global_ctx) {
 808                 put_wb_global_ctx();
 809         }
 810         return status;
 811 }
 812
 813 NSS_STATUS winbindd_priv_request_response(struct winbindd_context *ctx,
 814                                           int req_type,
 815                                           struct winbindd_request *request,
 816                                           struct winbindd_response *response)
 817 {
 818         NSS_STATUS status = NSS_STATUS_UNAVAIL;
 819         bool release_global_ctx = false;
 820
 821         if (ctx == NULL) {
 822                 ctx = get_wb_global_ctx();
 823                 release_global_ctx = true;
 824         }
 825
 826         status = winbindd_send_request(ctx, req_type, 1, request);
 827         if (status != NSS_STATUS_SUCCESS) {
 828                 goto out;
 829         }
 830         status = winbindd_get_response(ctx, response);
 831
 832 out:
 833         if (release_global_ctx) {
 834                 put_wb_global_ctx();
 835         }
 836         return status;
 837 }
 838
 839 /* Create and free winbindd context */
 840
 841 struct winbindd_context *winbindd_ctx_create(void)
 842 {
 843         struct winbindd_context *ctx;
 844
 845         ctx = calloc(1, sizeof(struct winbindd_context));
 846
 847         if (!ctx) {
 848                 return NULL;
 849         }
 850
 851         ctx->winbindd_fd = -1;
 852
 853         return ctx;
 854 }
 855
 856 void winbindd_ctx_free(struct winbindd_context *ctx)
 857 {
 858         winbind_close_sock(ctx);
 859         free(ctx);
 860 }