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 #elif defined (HAVE_PRAGMA_FINI)
 155 #pragma fini (winbind_destructor)
 156 #endif
 157 static void winbind_destructor(void)
 158 {
 159         struct winbindd_context *ctx;
 160
 161         ctx = get_wb_global_ctx();
 162         winbind_close_sock(ctx);
 163         put_wb_global_ctx();
 164 }
 165
 166 #define CONNECT_TIMEOUT 30
 167
 168 /* Make sure socket handle isn't stdin, stdout or stderr */
 169 #define RECURSION_LIMIT 3
 170
 171 static int make_nonstd_fd_internals(int fd, int limit /* Recursion limiter */)
 172 {
 173         int new_fd;
 174         if (fd >= 0 && fd <= 2) {
 175 #ifdef F_DUPFD
 176                 if ((new_fd = fcntl(fd, F_DUPFD, 3)) == -1) {
 177                         return -1;
 178                 }
 179                 /* Paranoia */
 180                 if (new_fd < 3) {
 181                         close(new_fd);
 182                         return -1;
 183                 }
 184                 close(fd);
 185                 return new_fd;
 186 #else
 187                 if (limit <= 0)
 188                         return -1;
 189
 190                 new_fd = dup(fd);
 191                 if (new_fd == -1)
 192                         return -1;
 193
 194                 /* use the program stack to hold our list of FDs to close */
 195                 new_fd = make_nonstd_fd_internals(new_fd, limit - 1);
 196                 close(fd);
 197                 return new_fd;
 198 #endif
 199         }
 200         return fd;
 201 }
 202
 203 /****************************************************************************
 204  Set a fd into blocking/nonblocking mode. Uses POSIX O_NONBLOCK if available,
 205  else
 206  if SYSV use O_NDELAY
 207  if BSD use FNDELAY
 208  Set close on exec also.
 209 ****************************************************************************/
 210
 211 static int make_safe_fd(int fd)
 212 {
 213         int result, flags;
 214         int new_fd = make_nonstd_fd_internals(fd, RECURSION_LIMIT);
 215         if (new_fd == -1) {
 216                 close(fd);
 217                 return -1;
 218         }
 219
 220         /* Socket should be nonblocking. */
 221 #ifdef O_NONBLOCK
 222 #define FLAG_TO_SET O_NONBLOCK
 223 #else
 224 #ifdef SYSV
 225 #define FLAG_TO_SET O_NDELAY
 226 #else /* BSD */
 227 #define FLAG_TO_SET FNDELAY
 228 #endif
 229 #endif
 230
 231         if ((flags = fcntl(new_fd, F_GETFL)) == -1) {
 232                 close(new_fd);
 233                 return -1;
 234         }
 235
 236         flags |= FLAG_TO_SET;
 237         if (fcntl(new_fd, F_SETFL, flags) == -1) {
 238                 close(new_fd);
 239                 return -1;
 240         }
 241
 242 #undef FLAG_TO_SET
 243
 244         /* Socket should be closed on exec() */
 245 #ifdef FD_CLOEXEC
 246         result = flags = fcntl(new_fd, F_GETFD, 0);
 247         if (flags >= 0) {
 248                 flags |= FD_CLOEXEC;
 249                 result = fcntl( new_fd, F_SETFD, flags );
 250         }
 251         if (result < 0) {
 252                 close(new_fd);
 253                 return -1;
 254         }
 255 #endif
 256         return new_fd;
 257 }
 258
 259 /**
 260  * @internal
 261  *
 262  * @brief Check if we talk to the privileged pipe which should be owned by root.
 263  *
 264  * This checks if we have uid_wrapper running and if this is the case it will
 265  * allow one to connect to the winbind privileged pipe even it is not owned by root.
 266  *
 267  * @param[in]  uid      The uid to check if we can safely talk to the pipe.
 268  *
 269  * @return              If we have access it returns true, else false.
 270  */
 271 static bool winbind_privileged_pipe_is_root(uid_t uid)
 272 {
 273         if (uid == 0) {
 274                 return true;
 275         }
 276
 277         if (uid_wrapper_enabled()) {
 278                 return true;
 279         }
 280
 281         return false;
 282 }
 283
 284 /* Connect to winbindd socket */
 285
 286 static int winbind_named_pipe_sock(const char *dir)
 287 {
 288         struct sockaddr_un sunaddr;
 289         struct stat st;
 290         int fd;
 291         int wait_time;
 292         int slept;
 293         int ret;
 294
 295         /* Check permissions on unix socket directory */
 296
 297         if (lstat(dir, &st) == -1) {
 298                 errno = ENOENT;
 299                 return -1;
 300         }
 301
 302         /*
 303          * This tells us that the pipe is owned by a privileged
 304          * process, as we will be sending passwords to it.
 305          */
 306         if (!S_ISDIR(st.st_mode) ||
 307             !winbind_privileged_pipe_is_root(st.st_uid)) {
 308                 errno = ENOENT;
 309                 return -1;
 310         }
 311
 312         /* Connect to socket */
 313
 314         sunaddr = (struct sockaddr_un) { .sun_family = AF_UNIX };
 315
 316         ret = snprintf(sunaddr.sun_path, sizeof(sunaddr.sun_path),
 317                        "%s/%s", dir, WINBINDD_SOCKET_NAME);
 318         if ((ret == -1) || (ret >= sizeof(sunaddr.sun_path))) {
 319                 errno = ENAMETOOLONG;
 320                 return -1;
 321         }
 322
 323         /* If socket file doesn't exist, don't bother trying to connect
 324            with retry.  This is an attempt to make the system usable when
 325            the winbindd daemon is not running. */
 326
 327         if (lstat(sunaddr.sun_path, &st) == -1) {
 328                 errno = ENOENT;
 329                 return -1;
 330         }
 331
 332         /* Check permissions on unix socket file */
 333
 334         /*
 335          * This tells us that the pipe is owned by a privileged
 336          * process, as we will be sending passwords to it.
 337          */
 338         if (!S_ISSOCK(st.st_mode) ||
 339             !winbind_privileged_pipe_is_root(st.st_uid)) {
 340                 errno = ENOENT;
 341                 return -1;
 342         }
 343
 344         /* Connect to socket */
 345
 346         if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) {
 347                 return -1;
 348         }
 349
 350         /* Set socket non-blocking and close on exec. */
 351
 352         if ((fd = make_safe_fd( fd)) == -1) {
 353                 return fd;
 354         }
 355
 356         for (wait_time = 0; connect(fd, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) == -1;
 357                         wait_time += slept) {
 358                 struct pollfd pfd;
 359                 int connect_errno = 0;
 360                 socklen_t errnosize;
 361
 362                 if (wait_time >= CONNECT_TIMEOUT)
 363                         goto error_out;
 364
 365                 switch (errno) {
 366                         case EINPROGRESS:
 367                                 pfd.fd = fd;
 368                                 pfd.events = POLLOUT;
 369
 370                                 ret = poll(&pfd, 1, (CONNECT_TIMEOUT - wait_time) * 1000);
 371
 372                                 if (ret > 0) {
 373                                         errnosize = sizeof(connect_errno);
 374
 375                                         ret = getsockopt(fd, SOL_SOCKET,
 376                                                         SO_ERROR, &connect_errno, &errnosize);
 377
 378                                         if (ret >= 0 && connect_errno == 0) {
 379                                                 /* Connect succeed */
 380                                                 goto out;
 381                                         }
 382                                 }
 383
 384                                 slept = CONNECT_TIMEOUT;
 385                                 break;
 386                         case EAGAIN:
 387                                 slept = rand() % 3 + 1;
 388                                 sleep(slept);
 389                                 break;
 390                         default:
 391                                 goto error_out;
 392                 }
 393
 394         }
 395
 396   out:
 397
 398         return fd;
 399
 400   error_out:
 401
 402         close(fd);
 403         return -1;
 404 }
 405
 406 static const char *winbindd_socket_dir(void)
 407 {
 408         if (nss_wrapper_enabled()) {
 409                 const char *env_dir;
 410
 411                 env_dir = getenv("SELFTEST_WINBINDD_SOCKET_DIR");
 412                 if (env_dir != NULL) {
 413                         return env_dir;
 414                 }
 415         }
 416
 417         return WINBINDD_SOCKET_DIR;
 418 }
 419
 420 /* Connect to winbindd socket */
 421
 422 static int winbind_open_pipe_sock(struct winbindd_context *ctx,
 423                                   int recursing, int need_priv)
 424 {
 425 #ifdef HAVE_UNIXSOCKET
 426         struct winbindd_request request;
 427         struct winbindd_response response;
 428
 429         ZERO_STRUCT(request);
 430         ZERO_STRUCT(response);
 431
 432         if (!ctx) {
 433                 return -1;
 434         }
 435
 436         if (ctx->our_pid != getpid()) {
 437                 winbind_close_sock(ctx);
 438                 ctx->our_pid = getpid();
 439         }
 440
 441         if ((need_priv != 0) && !ctx->is_privileged) {
 442                 winbind_close_sock(ctx);
 443         }
 444
 445         if (ctx->winbindd_fd != -1) {
 446                 return ctx->winbindd_fd;
 447         }
 448
 449         if (recursing) {
 450                 return -1;
 451         }
 452
 453         ctx->winbindd_fd = winbind_named_pipe_sock(winbindd_socket_dir());
 454
 455         if (ctx->winbindd_fd == -1) {
 456                 return -1;
 457         }
 458
 459         ctx->is_privileged = false;
 460
 461         /* version-check the socket */
 462
 463         request.wb_flags = WBFLAG_RECURSE;
 464         if ((winbindd_request_response(ctx, WINBINDD_INTERFACE_VERSION, &request,
 465                                        &response) != NSS_STATUS_SUCCESS) ||
 466             (response.data.interface_version != WINBIND_INTERFACE_VERSION)) {
 467                 winbind_close_sock(ctx);
 468                 return -1;
 469         }
 470
 471         if (need_priv == 0) {
 472                 return ctx->winbindd_fd;
 473         }
 474
 475         /* try and get priv pipe */
 476
 477         request.wb_flags = WBFLAG_RECURSE;
 478
 479         /* Note that response needs to be initialized to avoid
 480          * crashing on clean up after WINBINDD_PRIV_PIPE_DIR call failed
 481          * as interface version (from the first request) returned as a fstring,
 482          * thus response.extra_data.data will not be NULL even though
 483          * winbindd response did not write over it due to a failure */
 484         ZERO_STRUCT(response);
 485         if (winbindd_request_response(ctx, WINBINDD_PRIV_PIPE_DIR, &request,
 486                                       &response) == NSS_STATUS_SUCCESS) {
 487                 int fd;
 488                 fd = winbind_named_pipe_sock((char *)response.extra_data.data);
 489                 if (fd != -1) {
 490                         close(ctx->winbindd_fd);
 491                         ctx->winbindd_fd = fd;
 492                         ctx->is_privileged = true;
 493                 }
 494
 495                 SAFE_FREE(response.extra_data.data);
 496         }
 497
 498         if (!ctx->is_privileged) {
 499                 return -1;
 500         }
 501
 502         return ctx->winbindd_fd;
 503 #else
 504         return -1;
 505 #endif /* HAVE_UNIXSOCKET */
 506 }
 507
 508 /* Write data to winbindd socket */
 509
 510 static int winbind_write_sock(struct winbindd_context *ctx, void *buffer,
 511                               int count, int recursing, int need_priv)
 512 {
 513         int fd, result, nwritten;
 514
 515         /* Open connection to winbind daemon */
 516
 517  restart:
 518
 519         fd = winbind_open_pipe_sock(ctx, recursing, need_priv);
 520         if (fd == -1) {
 521                 errno = ENOENT;
 522                 return -1;
 523         }
 524
 525         /* Write data to socket */
 526
 527         nwritten = 0;
 528
 529         while(nwritten < count) {
 530                 struct pollfd pfd;
 531                 int ret;
 532
 533                 /* Catch pipe close on other end by checking if a read()
 534                    call would not block by calling poll(). */
 535
 536                 pfd.fd = fd;
 537                 pfd.events = POLLIN|POLLOUT|POLLHUP;
 538
 539                 ret = poll(&pfd, 1, -1);
 540                 if (ret == -1) {
 541                         winbind_close_sock(ctx);
 542                         return -1;                   /* poll error */
 543                 }
 544
 545                 /* Write should be OK if fd not available for reading */
 546
 547                 if ((ret == 1) && (pfd.revents & (POLLIN|POLLHUP|POLLERR))) {
 548
 549                         /* Pipe has closed on remote end */
 550
 551                         winbind_close_sock(ctx);
 552                         goto restart;
 553                 }
 554
 555                 /* Do the write */
 556
 557                 result = write(fd, (char *)buffer + nwritten,
 558                                count - nwritten);
 559
 560                 if ((result == -1) || (result == 0)) {
 561
 562                         /* Write failed */
 563
 564                         winbind_close_sock(ctx);
 565                         return -1;
 566                 }
 567
 568                 nwritten += result;
 569         }
 570
 571         return nwritten;
 572 }
 573
 574 /* Read data from winbindd socket */
 575
 576 static int winbind_read_sock(struct winbindd_context *ctx,
 577                              void *buffer, int count)
 578 {
 579         int fd;
 580         int nread = 0;
 581         int total_time = 0;
 582
 583         fd = winbind_open_pipe_sock(ctx, false, false);
 584         if (fd == -1) {
 585                 return -1;
 586         }
 587
 588         /* Read data from socket */
 589         while(nread < count) {
 590                 struct pollfd pfd;
 591                 int ret;
 592
 593                 /* Catch pipe close on other end by checking if a read()
 594                    call would not block by calling poll(). */
 595
 596                 pfd.fd = fd;
 597                 pfd.events = POLLIN|POLLHUP;
 598
 599                 /* Wait for 5 seconds for a reply. May need to parameterise this... */
 600
 601                 ret = poll(&pfd, 1, 5000);
 602                 if (ret == -1) {
 603                         winbind_close_sock(ctx);
 604                         return -1;                   /* poll error */
 605                 }
 606
 607                 if (ret == 0) {
 608                         /* Not ready for read yet... */
 609                         if (total_time >= 300) {
 610                                 /* Timeout */
 611                                 winbind_close_sock(ctx);
 612                                 return -1;
 613                         }
 614                         total_time += 5;
 615                         continue;
 616                 }
 617
 618                 if ((ret == 1) && (pfd.revents & (POLLIN|POLLHUP|POLLERR))) {
 619
 620                         /* Do the Read */
 621
 622                         int result = read(fd, (char *)buffer + nread,
 623                               count - nread);
 624
 625                         if ((result == -1) || (result == 0)) {
 626
 627                                 /* Read failed.  I think the only useful thing we
 628                                    can do here is just return -1 and fail since the
 629                                    transaction has failed half way through. */
 630
 631                                 winbind_close_sock(ctx);
 632                                 return -1;
 633                         }
 634
 635                         nread += result;
 636
 637                 }
 638         }
 639
 640         return nread;
 641 }
 642
 643 /* Read reply */
 644
 645 static int winbindd_read_reply(struct winbindd_context *ctx,
 646                                struct winbindd_response *response)
 647 {
 648         int result1, result2 = 0;
 649
 650         if (!response) {
 651                 return -1;
 652         }
 653
 654         /* Read fixed length response */
 655
 656         result1 = winbind_read_sock(ctx, response,
 657                                     sizeof(struct winbindd_response));
 658
 659         /* We actually send the pointer value of the extra_data field from
 660            the server.  This has no meaning in the client's address space
 661            so we clear it out. */
 662
 663         response->extra_data.data = NULL;
 664
 665         if (result1 == -1) {
 666                 return -1;
 667         }
 668
 669         if (response->length < sizeof(struct winbindd_response)) {
 670                 return -1;
 671         }
 672
 673         /* Read variable length response */
 674
 675         if (response->length > sizeof(struct winbindd_response)) {
 676                 int extra_data_len = response->length -
 677                         sizeof(struct winbindd_response);
 678
 679                 /* Mallocate memory for extra data */
 680
 681                 if (!(response->extra_data.data = malloc(extra_data_len))) {
 682                         return -1;
 683                 }
 684
 685                 result2 = winbind_read_sock(ctx, response->extra_data.data,
 686                                             extra_data_len);
 687                 if (result2 == -1) {
 688                         winbindd_free_response(response);
 689                         return -1;
 690                 }
 691         }
 692
 693         /* Return total amount of data read */
 694
 695         return result1 + result2;
 696 }
 697
 698 /*
 699  * send simple types of requests
 700  */
 701
 702 static NSS_STATUS winbindd_send_request(
 703         struct winbindd_context *ctx,
 704         int req_type,
 705         int need_priv,
 706         struct winbindd_request *request)
 707 {
 708         struct winbindd_request lrequest;
 709
 710         /* Check for our tricky environment variable */
 711
 712         if (winbind_env_set()) {
 713                 return NSS_STATUS_NOTFOUND;
 714         }
 715
 716         if (!request) {
 717                 ZERO_STRUCT(lrequest);
 718                 request = &lrequest;
 719         }
 720
 721         /* Fill in request and send down pipe */
 722
 723         winbindd_init_request(request, req_type);
 724
 725         if (winbind_write_sock(ctx, request, sizeof(*request),
 726                                request->wb_flags & WBFLAG_RECURSE,
 727                                need_priv) == -1)
 728         {
 729                 /* Set ENOENT for consistency.  Required by some apps */
 730                 errno = ENOENT;
 731
 732                 return NSS_STATUS_UNAVAIL;
 733         }
 734
 735         if ((request->extra_len != 0) &&
 736             (winbind_write_sock(ctx, request->extra_data.data,
 737                                 request->extra_len,
 738                                 request->wb_flags & WBFLAG_RECURSE,
 739                                 need_priv) == -1))
 740         {
 741                 /* Set ENOENT for consistency.  Required by some apps */
 742                 errno = ENOENT;
 743
 744                 return NSS_STATUS_UNAVAIL;
 745         }
 746
 747         return NSS_STATUS_SUCCESS;
 748 }
 749
 750 /*
 751  * Get results from winbindd request
 752  */
 753
 754 static NSS_STATUS winbindd_get_response(struct winbindd_context *ctx,
 755                                         struct winbindd_response *response)
 756 {
 757         struct winbindd_response lresponse;
 758
 759         if (!response) {
 760                 ZERO_STRUCT(lresponse);
 761                 response = &lresponse;
 762         }
 763
 764         init_response(response);
 765
 766         /* Wait for reply */
 767         if (winbindd_read_reply(ctx, response) == -1) {
 768                 /* Set ENOENT for consistency.  Required by some apps */
 769                 errno = ENOENT;
 770
 771                 return NSS_STATUS_UNAVAIL;
 772         }
 773
 774         /* Throw away extra data if client didn't request it */
 775         if (response == &lresponse) {
 776                 winbindd_free_response(response);
 777         }
 778
 779         /* Copy reply data from socket */
 780         if (response->result != WINBINDD_OK) {
 781                 return NSS_STATUS_NOTFOUND;
 782         }
 783
 784         return NSS_STATUS_SUCCESS;
 785 }
 786
 787 /* Handle simple types of requests */
 788
 789 NSS_STATUS winbindd_request_response(struct winbindd_context *ctx,
 790                                      int req_type,
 791                                      struct winbindd_request *request,
 792                                      struct winbindd_response *response)
 793 {
 794         NSS_STATUS status = NSS_STATUS_UNAVAIL;
 795         bool release_global_ctx = false;
 796
 797         if (ctx == NULL) {
 798                 ctx = get_wb_global_ctx();
 799                 release_global_ctx = true;
 800         }
 801
 802         status = winbindd_send_request(ctx, req_type, 0, request);
 803         if (status != NSS_STATUS_SUCCESS) {
 804                 goto out;
 805         }
 806         status = winbindd_get_response(ctx, response);
 807
 808 out:
 809         if (release_global_ctx) {
 810                 put_wb_global_ctx();
 811         }
 812         return status;
 813 }
 814
 815 NSS_STATUS winbindd_priv_request_response(struct winbindd_context *ctx,
 816                                           int req_type,
 817                                           struct winbindd_request *request,
 818                                           struct winbindd_response *response)
 819 {
 820         NSS_STATUS status = NSS_STATUS_UNAVAIL;
 821         bool release_global_ctx = false;
 822
 823         if (ctx == NULL) {
 824                 ctx = get_wb_global_ctx();
 825                 release_global_ctx = true;
 826         }
 827
 828         status = winbindd_send_request(ctx, req_type, 1, request);
 829         if (status != NSS_STATUS_SUCCESS) {
 830                 goto out;
 831         }
 832         status = winbindd_get_response(ctx, response);
 833
 834 out:
 835         if (release_global_ctx) {
 836                 put_wb_global_ctx();
 837         }
 838         return status;
 839 }
 840
 841 /* Create and free winbindd context */
 842
 843 struct winbindd_context *winbindd_ctx_create(void)
 844 {
 845         struct winbindd_context *ctx;
 846
 847         ctx = calloc(1, sizeof(struct winbindd_context));
 848
 849         if (!ctx) {
 850                 return NULL;
 851         }
 852
 853         ctx->winbindd_fd = -1;
 854
 855         return ctx;
 856 }
 857
 858 void winbindd_ctx_free(struct winbindd_context *ctx)
 859 {
 860         winbind_close_sock(ctx);
 861         free(ctx);
 862 }