source: branches/samba-3.5.x/nsswitch/wb_common.c@ 726

Last change on this file since 726 was 593, checked in by Herwig Bauernfeind, 14 years ago

Samba 3.5: Update trunk to 3.5.7
File size: 15.0 KB
Line 
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
10
11 This library is free software; you can redistribute it and/or
12 modify it under the terms of the GNU Lesser General Public
13 License as published by the Free Software Foundation; either
14 version 3 of the License, or (at your option) any later version.
15
16 This library is distributed in the hope that it will be useful,
17 but WITHOUT ANY WARRANTY; without even the implied warranty of
18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 Library General Public License for more details.
20
21 You should have received a copy of the GNU Lesser General Public License
22 along with this program. If not, see <http://www.gnu.org/licenses/>.
23*/
24
25#include "winbind_client.h"
26
27/* Global variables. These are effectively the client state information */
28
29int winbindd_fd = -1; /* fd for winbindd socket */
30static int is_privileged = 0;
31
32/* Free a response structure */
33
34void winbindd_free_response(struct winbindd_response *response)
35{
36 /* Free any allocated extra_data */
37
38 if (response)
39 SAFE_FREE(response->extra_data.data);
40}
41
42/* Initialise a request structure */
43
44void winbindd_init_request(struct winbindd_request *request, int request_type)
45{
46 request->length = sizeof(struct winbindd_request);
47
48 request->cmd = (enum winbindd_cmd)request_type;
49 request->pid = getpid();
50
51}
52
53/* Initialise a response structure */
54
55static void init_response(struct winbindd_response *response)
56{
57 /* Initialise return value */
58
59 response->result = WINBINDD_ERROR;
60}
61
62/* Close established socket */
63
64#if HAVE_FUNCTION_ATTRIBUTE_DESTRUCTOR
65__attribute__((destructor))
66#endif
67void winbind_close_sock(void)
68{
69 if (winbindd_fd != -1) {
70 close(winbindd_fd);
71 winbindd_fd = -1;
72 }
73}
74
75#define CONNECT_TIMEOUT 30
76
77/* Make sure socket handle isn't stdin, stdout or stderr */
78#define RECURSION_LIMIT 3
79
80static int make_nonstd_fd_internals(int fd, int limit /* Recursion limiter */)
81{
82 int new_fd;
83 if (fd >= 0 && fd <= 2) {
84#ifdef F_DUPFD
85 if ((new_fd = fcntl(fd, F_DUPFD, 3)) == -1) {
86 return -1;
87 }
88 /* Paranoia */
89 if (new_fd < 3) {
90 close(new_fd);
91 return -1;
92 }
93 close(fd);
94 return new_fd;
95#else
96 if (limit <= 0)
97 return -1;
98
99 new_fd = dup(fd);
100 if (new_fd == -1)
101 return -1;
102
103 /* use the program stack to hold our list of FDs to close */
104 new_fd = make_nonstd_fd_internals(new_fd, limit - 1);
105 close(fd);
106 return new_fd;
107#endif
108 }
109 return fd;
110}
111
112/****************************************************************************
113 Set a fd into blocking/nonblocking mode. Uses POSIX O_NONBLOCK if available,
114 else
115 if SYSV use O_NDELAY
116 if BSD use FNDELAY
117 Set close on exec also.
118****************************************************************************/
119
120static int make_safe_fd(int fd)
121{
122 int result, flags;
123 int new_fd = make_nonstd_fd_internals(fd, RECURSION_LIMIT);
124 if (new_fd == -1) {
125 close(fd);
126 return -1;
127 }
128
129 /* Socket should be nonblocking. */
130#ifdef O_NONBLOCK
131#define FLAG_TO_SET O_NONBLOCK
132#else
133#ifdef SYSV
134#define FLAG_TO_SET O_NDELAY
135#else /* BSD */
136#define FLAG_TO_SET FNDELAY
137#endif
138#endif
139
140 if ((flags = fcntl(new_fd, F_GETFL)) == -1) {
141 close(new_fd);
142 return -1;
143 }
144
145 flags |= FLAG_TO_SET;
146 if (fcntl(new_fd, F_SETFL, flags) == -1) {
147 close(new_fd);
148 return -1;
149 }
150
151#undef FLAG_TO_SET
152
153 /* Socket should be closed on exec() */
154#ifdef FD_CLOEXEC
155 result = flags = fcntl(new_fd, F_GETFD, 0);
156 if (flags >= 0) {
157 flags |= FD_CLOEXEC;
158 result = fcntl( new_fd, F_SETFD, flags );
159 }
160 if (result < 0) {
161 close(new_fd);
162 return -1;
163 }
164#endif
165 return new_fd;
166}
167
168/* Connect to winbindd socket */
169
170static int winbind_named_pipe_sock(const char *dir)
171{
172 struct sockaddr_un sunaddr;
173 struct stat st;
174 char *path = NULL;
175 int fd;
176 int wait_time;
177 int slept;
178
179 /* Check permissions on unix socket directory */
180
181 if (lstat(dir, &st) == -1) {
182 errno = ENOENT;
183 return -1;
184 }
185
186 if (!S_ISDIR(st.st_mode) ||
187 (st.st_uid != 0 && st.st_uid != geteuid())) {
188 errno = ENOENT;
189 return -1;
190 }
191
192 /* Connect to socket */
193
194 if (asprintf(&path, "%s/%s", dir, WINBINDD_SOCKET_NAME) < 0) {
195 return -1;
196 }
197
198 ZERO_STRUCT(sunaddr);
199 sunaddr.sun_family = AF_UNIX;
200 strncpy(sunaddr.sun_path, path, sizeof(sunaddr.sun_path) - 1);
201
202 /* If socket file doesn't exist, don't bother trying to connect
203 with retry. This is an attempt to make the system usable when
204 the winbindd daemon is not running. */
205
206 if (lstat(path, &st) == -1) {
207 errno = ENOENT;
208 SAFE_FREE(path);
209 return -1;
210 }
211
212 SAFE_FREE(path);
213 /* Check permissions on unix socket file */
214
215 if (!S_ISSOCK(st.st_mode) ||
216 (st.st_uid != 0 && st.st_uid != geteuid())) {
217 errno = ENOENT;
218 return -1;
219 }
220
221 /* Connect to socket */
222
223 if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) {
224 return -1;
225 }
226
227 /* Set socket non-blocking and close on exec. */
228
229 if ((fd = make_safe_fd( fd)) == -1) {
230 return fd;
231 }
232
233 for (wait_time = 0; connect(fd, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) == -1;
234 wait_time += slept) {
235 struct timeval tv;
236 fd_set w_fds;
237 int ret;
238 int connect_errno = 0;
239 socklen_t errnosize;
240
241 if (wait_time >= CONNECT_TIMEOUT)
242 goto error_out;
243
244 switch (errno) {
245 case EINPROGRESS:
246 FD_ZERO(&w_fds);
247 if (fd < 0 || fd >= FD_SETSIZE) {
248 errno = EBADF;
249 goto error_out;
250 }
251 FD_SET(fd, &w_fds);
252 tv.tv_sec = CONNECT_TIMEOUT - wait_time;
253 tv.tv_usec = 0;
254
255 ret = select(fd + 1, NULL, &w_fds, NULL, &tv);
256
257 if (ret > 0) {
258 errnosize = sizeof(connect_errno);
259
260 ret = getsockopt(fd, SOL_SOCKET,
261 SO_ERROR, &connect_errno, &errnosize);
262
263 if (ret >= 0 && connect_errno == 0) {
264 /* Connect succeed */
265 goto out;
266 }
267 }
268
269 slept = CONNECT_TIMEOUT;
270 break;
271 case EAGAIN:
272 slept = rand() % 3 + 1;
273 sleep(slept);
274 break;
275 default:
276 goto error_out;
277 }
278
279 }
280
281 out:
282
283 return fd;
284
285 error_out:
286
287 close(fd);
288 return -1;
289}
290
291static const char *winbindd_socket_dir(void)
292{
293#ifdef SOCKET_WRAPPER
294 const char *env_dir;
295
296 env_dir = getenv(WINBINDD_SOCKET_DIR_ENVVAR);
297 if (env_dir) {
298 return env_dir;
299 }
300#endif
301
302 return WINBINDD_SOCKET_DIR;
303}
304
305/* Connect to winbindd socket */
306
307static int winbind_open_pipe_sock(int recursing, int need_priv)
308{
309#ifdef HAVE_UNIXSOCKET
310 static pid_t our_pid;
311 struct winbindd_request request;
312 struct winbindd_response response;
313 ZERO_STRUCT(request);
314 ZERO_STRUCT(response);
315
316 if (our_pid != getpid()) {
317 winbind_close_sock();
318 our_pid = getpid();
319 }
320
321 if ((need_priv != 0) && (is_privileged == 0)) {
322 winbind_close_sock();
323 }
324
325 if (winbindd_fd != -1) {
326 return winbindd_fd;
327 }
328
329 if (recursing) {
330 return -1;
331 }
332
333 if ((winbindd_fd = winbind_named_pipe_sock(winbindd_socket_dir())) == -1) {
334 return -1;
335 }
336
337 is_privileged = 0;
338
339 /* version-check the socket */
340
341 request.wb_flags = WBFLAG_RECURSE;
342 if ((winbindd_request_response(WINBINDD_INTERFACE_VERSION, &request, &response) != NSS_STATUS_SUCCESS) || (response.data.interface_version != WINBIND_INTERFACE_VERSION)) {
343 winbind_close_sock();
344 return -1;
345 }
346
347 /* try and get priv pipe */
348
349 request.wb_flags = WBFLAG_RECURSE;
350 if (winbindd_request_response(WINBINDD_PRIV_PIPE_DIR, &request, &response) == NSS_STATUS_SUCCESS) {
351 int fd;
352 if ((fd = winbind_named_pipe_sock((char *)response.extra_data.data)) != -1) {
353 close(winbindd_fd);
354 winbindd_fd = fd;
355 is_privileged = 1;
356 }
357 }
358
359 if ((need_priv != 0) && (is_privileged == 0)) {
360 return -1;
361 }
362
363 SAFE_FREE(response.extra_data.data);
364
365 return winbindd_fd;
366#else
367 return -1;
368#endif /* HAVE_UNIXSOCKET */
369}
370
371/* Write data to winbindd socket */
372
373int winbind_write_sock(void *buffer, int count, int recursing, int need_priv)
374{
375 int result, nwritten;
376
377 /* Open connection to winbind daemon */
378
379 restart:
380
381 if (winbind_open_pipe_sock(recursing, need_priv) == -1) {
382 errno = ENOENT;
383 return -1;
384 }
385
386 /* Write data to socket */
387
388 nwritten = 0;
389
390 while(nwritten < count) {
391 struct timeval tv;
392 fd_set r_fds;
393
394 /* Catch pipe close on other end by checking if a read()
395 call would not block by calling select(). */
396
397 FD_ZERO(&r_fds);
398 if (winbindd_fd < 0 || winbindd_fd >= FD_SETSIZE) {
399 errno = EBADF;
400 winbind_close_sock();
401 return -1;
402 }
403 FD_SET(winbindd_fd, &r_fds);
404 ZERO_STRUCT(tv);
405
406 if (select(winbindd_fd + 1, &r_fds, NULL, NULL, &tv) == -1) {
407 winbind_close_sock();
408 return -1; /* Select error */
409 }
410
411 /* Write should be OK if fd not available for reading */
412
413 if (!FD_ISSET(winbindd_fd, &r_fds)) {
414
415 /* Do the write */
416
417 result = write(winbindd_fd,
418 (char *)buffer + nwritten,
419 count - nwritten);
420
421 if ((result == -1) || (result == 0)) {
422
423 /* Write failed */
424
425 winbind_close_sock();
426 return -1;
427 }
428
429 nwritten += result;
430
431 } else {
432
433 /* Pipe has closed on remote end */
434
435 winbind_close_sock();
436 goto restart;
437 }
438 }
439
440 return nwritten;
441}
442
443/* Read data from winbindd socket */
444
445int winbind_read_sock(void *buffer, int count)
446{
447 int nread = 0;
448 int total_time = 0, selret;
449
450 if (winbindd_fd == -1) {
451 return -1;
452 }
453
454 /* Read data from socket */
455 while(nread < count) {
456 struct timeval tv;
457 fd_set r_fds;
458
459 /* Catch pipe close on other end by checking if a read()
460 call would not block by calling select(). */
461
462 FD_ZERO(&r_fds);
463 if (winbindd_fd < 0 || winbindd_fd >= FD_SETSIZE) {
464 errno = EBADF;
465 winbind_close_sock();
466 return -1;
467 }
468 FD_SET(winbindd_fd, &r_fds);
469 ZERO_STRUCT(tv);
470 /* Wait for 5 seconds for a reply. May need to parameterise this... */
471 tv.tv_sec = 5;
472
473 if ((selret = select(winbindd_fd + 1, &r_fds, NULL, NULL, &tv)) == -1) {
474 winbind_close_sock();
475 return -1; /* Select error */
476 }
477
478 if (selret == 0) {
479 /* Not ready for read yet... */
480 if (total_time >= 30) {
481 /* Timeout */
482 winbind_close_sock();
483 return -1;
484 }
485 total_time += 5;
486 continue;
487 }
488
489 if (FD_ISSET(winbindd_fd, &r_fds)) {
490
491 /* Do the Read */
492
493 int result = read(winbindd_fd, (char *)buffer + nread,
494 count - nread);
495
496 if ((result == -1) || (result == 0)) {
497
498 /* Read failed. I think the only useful thing we
499 can do here is just return -1 and fail since the
500 transaction has failed half way through. */
501
502 winbind_close_sock();
503 return -1;
504 }
505
506 nread += result;
507
508 }
509 }
510
511 return nread;
512}
513
514/* Read reply */
515
516int winbindd_read_reply(struct winbindd_response *response)
517{
518 int result1, result2 = 0;
519
520 if (!response) {
521 return -1;
522 }
523
524 /* Read fixed length response */
525
526 result1 = winbind_read_sock(response,
527 sizeof(struct winbindd_response));
528 if (result1 == -1) {
529 return -1;
530 }
531
532 /* We actually send the pointer value of the extra_data field from
533 the server. This has no meaning in the client's address space
534 so we clear it out. */
535
536 response->extra_data.data = NULL;
537
538 /* Read variable length response */
539
540 if (response->length > sizeof(struct winbindd_response)) {
541 int extra_data_len = response->length -
542 sizeof(struct winbindd_response);
543
544 /* Mallocate memory for extra data */
545
546 if (!(response->extra_data.data = malloc(extra_data_len))) {
547 return -1;
548 }
549
550 result2 = winbind_read_sock(response->extra_data.data,
551 extra_data_len);
552 if (result2 == -1) {
553 winbindd_free_response(response);
554 return -1;
555 }
556 }
557
558 /* Return total amount of data read */
559
560 return result1 + result2;
561}
562
563/*
564 * send simple types of requests
565 */
566
567NSS_STATUS winbindd_send_request(int req_type, int need_priv,
568 struct winbindd_request *request)
569{
570 struct winbindd_request lrequest;
571
572 /* Check for our tricky environment variable */
573
574 if (winbind_env_set()) {
575 return NSS_STATUS_NOTFOUND;
576 }
577
578 if (!request) {
579 ZERO_STRUCT(lrequest);
580 request = &lrequest;
581 }
582
583 /* Fill in request and send down pipe */
584
585 winbindd_init_request(request, req_type);
586
587 if (winbind_write_sock(request, sizeof(*request),
588 request->wb_flags & WBFLAG_RECURSE,
589 need_priv) == -1)
590 {
591 /* Set ENOENT for consistency. Required by some apps */
592 errno = ENOENT;
593
594 return NSS_STATUS_UNAVAIL;
595 }
596
597 if ((request->extra_len != 0) &&
598 (winbind_write_sock(request->extra_data.data,
599 request->extra_len,
600 request->wb_flags & WBFLAG_RECURSE,
601 need_priv) == -1))
602 {
603 /* Set ENOENT for consistency. Required by some apps */
604 errno = ENOENT;
605
606 return NSS_STATUS_UNAVAIL;
607 }
608
609 return NSS_STATUS_SUCCESS;
610}
611
612/*
613 * Get results from winbindd request
614 */
615
616NSS_STATUS winbindd_get_response(struct winbindd_response *response)
617{
618 struct winbindd_response lresponse;
619
620 if (!response) {
621 ZERO_STRUCT(lresponse);
622 response = &lresponse;
623 }
624
625 init_response(response);
626
627 /* Wait for reply */
628 if (winbindd_read_reply(response) == -1) {
629 /* Set ENOENT for consistency. Required by some apps */
630 errno = ENOENT;
631
632 return NSS_STATUS_UNAVAIL;
633 }
634
635 /* Throw away extra data if client didn't request it */
636 if (response == &lresponse) {
637 winbindd_free_response(response);
638 }
639
640 /* Copy reply data from socket */
641 if (response->result != WINBINDD_OK) {
642 return NSS_STATUS_NOTFOUND;
643 }
644
645 return NSS_STATUS_SUCCESS;
646}
647
648/* Handle simple types of requests */
649
650NSS_STATUS winbindd_request_response(int req_type,
651 struct winbindd_request *request,
652 struct winbindd_response *response)
653{
654 NSS_STATUS status = NSS_STATUS_UNAVAIL;
655 int count = 0;
656
657 while ((status == NSS_STATUS_UNAVAIL) && (count < 10)) {
658 status = winbindd_send_request(req_type, 0, request);
659 if (status != NSS_STATUS_SUCCESS)
660 return(status);
661 status = winbindd_get_response(response);
662 count += 1;
663 }
664
665 return status;
666}
667
668NSS_STATUS winbindd_priv_request_response(int req_type,
669 struct winbindd_request *request,
670 struct winbindd_response *response)
671{
672 NSS_STATUS status = NSS_STATUS_UNAVAIL;
673 int count = 0;
674
675 while ((status == NSS_STATUS_UNAVAIL) && (count < 10)) {
676 status = winbindd_send_request(req_type, 1, request);
677 if (status != NSS_STATUS_SUCCESS)
678 return(status);
679 status = winbindd_get_response(response);
680 count += 1;
681 }
682
683 return status;
684}
685
686/*************************************************************************
687 ************************************************************************/
688
689const char *nss_err_str(NSS_STATUS ret)
690{
691 switch (ret) {
692 case NSS_STATUS_TRYAGAIN:
693 return "NSS_STATUS_TRYAGAIN";
694 case NSS_STATUS_SUCCESS:
695 return "NSS_STATUS_SUCCESS";
696 case NSS_STATUS_NOTFOUND:
697 return "NSS_STATUS_NOTFOUND";
698 case NSS_STATUS_UNAVAIL:
699 return "NSS_STATUS_UNAVAIL";
700#ifdef NSS_STATUS_RETURN
701 case NSS_STATUS_RETURN:
702 return "NSS_STATUS_RETURN";
703#endif
704 default:
705 return "UNKNOWN RETURN CODE!!!!!!!";
706 }
707}
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