source: trunk/server/nsswitch/wb_common.c@ 590

Last change on this file since 590 was 590, checked in by Herwig Bauernfeind, 14 years ago

Samba 3.5: Update trunk to 3.5.6
File size: 14.7 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 FD_SET(fd, &w_fds);
248 tv.tv_sec = CONNECT_TIMEOUT - wait_time;
249 tv.tv_usec = 0;
250
251 ret = select(fd + 1, NULL, &w_fds, NULL, &tv);
252
253 if (ret > 0) {
254 errnosize = sizeof(connect_errno);
255
256 ret = getsockopt(fd, SOL_SOCKET,
257 SO_ERROR, &connect_errno, &errnosize);
258
259 if (ret >= 0 && connect_errno == 0) {
260 /* Connect succeed */
261 goto out;
262 }
263 }
264
265 slept = CONNECT_TIMEOUT;
266 break;
267 case EAGAIN:
268 slept = rand() % 3 + 1;
269 sleep(slept);
270 break;
271 default:
272 goto error_out;
273 }
274
275 }
276
277 out:
278
279 return fd;
280
281 error_out:
282
283 close(fd);
284 return -1;
285}
286
287static const char *winbindd_socket_dir(void)
288{
289#ifdef SOCKET_WRAPPER
290 const char *env_dir;
291
292 env_dir = getenv(WINBINDD_SOCKET_DIR_ENVVAR);
293 if (env_dir) {
294 return env_dir;
295 }
296#endif
297
298 return WINBINDD_SOCKET_DIR;
299}
300
301/* Connect to winbindd socket */
302
303static int winbind_open_pipe_sock(int recursing, int need_priv)
304{
305#ifdef HAVE_UNIXSOCKET
306 static pid_t our_pid;
307 struct winbindd_request request;
308 struct winbindd_response response;
309 ZERO_STRUCT(request);
310 ZERO_STRUCT(response);
311
312 if (our_pid != getpid()) {
313 winbind_close_sock();
314 our_pid = getpid();
315 }
316
317 if ((need_priv != 0) && (is_privileged == 0)) {
318 winbind_close_sock();
319 }
320
321 if (winbindd_fd != -1) {
322 return winbindd_fd;
323 }
324
325 if (recursing) {
326 return -1;
327 }
328
329 if ((winbindd_fd = winbind_named_pipe_sock(winbindd_socket_dir())) == -1) {
330 return -1;
331 }
332
333 is_privileged = 0;
334
335 /* version-check the socket */
336
337 request.wb_flags = WBFLAG_RECURSE;
338 if ((winbindd_request_response(WINBINDD_INTERFACE_VERSION, &request, &response) != NSS_STATUS_SUCCESS) || (response.data.interface_version != WINBIND_INTERFACE_VERSION)) {
339 winbind_close_sock();
340 return -1;
341 }
342
343 /* try and get priv pipe */
344
345 request.wb_flags = WBFLAG_RECURSE;
346 if (winbindd_request_response(WINBINDD_PRIV_PIPE_DIR, &request, &response) == NSS_STATUS_SUCCESS) {
347 int fd;
348 if ((fd = winbind_named_pipe_sock((char *)response.extra_data.data)) != -1) {
349 close(winbindd_fd);
350 winbindd_fd = fd;
351 is_privileged = 1;
352 }
353 }
354
355 if ((need_priv != 0) && (is_privileged == 0)) {
356 return -1;
357 }
358
359 SAFE_FREE(response.extra_data.data);
360
361 return winbindd_fd;
362#else
363 return -1;
364#endif /* HAVE_UNIXSOCKET */
365}
366
367/* Write data to winbindd socket */
368
369int winbind_write_sock(void *buffer, int count, int recursing, int need_priv)
370{
371 int result, nwritten;
372
373 /* Open connection to winbind daemon */
374
375 restart:
376
377 if (winbind_open_pipe_sock(recursing, need_priv) == -1) {
378 errno = ENOENT;
379 return -1;
380 }
381
382 /* Write data to socket */
383
384 nwritten = 0;
385
386 while(nwritten < count) {
387 struct timeval tv;
388 fd_set r_fds;
389
390 /* Catch pipe close on other end by checking if a read()
391 call would not block by calling select(). */
392
393 FD_ZERO(&r_fds);
394 FD_SET(winbindd_fd, &r_fds);
395 ZERO_STRUCT(tv);
396
397 if (select(winbindd_fd + 1, &r_fds, NULL, NULL, &tv) == -1) {
398 winbind_close_sock();
399 return -1; /* Select error */
400 }
401
402 /* Write should be OK if fd not available for reading */
403
404 if (!FD_ISSET(winbindd_fd, &r_fds)) {
405
406 /* Do the write */
407
408 result = write(winbindd_fd,
409 (char *)buffer + nwritten,
410 count - nwritten);
411
412 if ((result == -1) || (result == 0)) {
413
414 /* Write failed */
415
416 winbind_close_sock();
417 return -1;
418 }
419
420 nwritten += result;
421
422 } else {
423
424 /* Pipe has closed on remote end */
425
426 winbind_close_sock();
427 goto restart;
428 }
429 }
430
431 return nwritten;
432}
433
434/* Read data from winbindd socket */
435
436int winbind_read_sock(void *buffer, int count)
437{
438 int nread = 0;
439 int total_time = 0, selret;
440
441 if (winbindd_fd == -1) {
442 return -1;
443 }
444
445 /* Read data from socket */
446 while(nread < count) {
447 struct timeval tv;
448 fd_set r_fds;
449
450 /* Catch pipe close on other end by checking if a read()
451 call would not block by calling select(). */
452
453 FD_ZERO(&r_fds);
454 FD_SET(winbindd_fd, &r_fds);
455 ZERO_STRUCT(tv);
456 /* Wait for 5 seconds for a reply. May need to parameterise this... */
457 tv.tv_sec = 5;
458
459 if ((selret = select(winbindd_fd + 1, &r_fds, NULL, NULL, &tv)) == -1) {
460 winbind_close_sock();
461 return -1; /* Select error */
462 }
463
464 if (selret == 0) {
465 /* Not ready for read yet... */
466 if (total_time >= 30) {
467 /* Timeout */
468 winbind_close_sock();
469 return -1;
470 }
471 total_time += 5;
472 continue;
473 }
474
475 if (FD_ISSET(winbindd_fd, &r_fds)) {
476
477 /* Do the Read */
478
479 int result = read(winbindd_fd, (char *)buffer + nread,
480 count - nread);
481
482 if ((result == -1) || (result == 0)) {
483
484 /* Read failed. I think the only useful thing we
485 can do here is just return -1 and fail since the
486 transaction has failed half way through. */
487
488 winbind_close_sock();
489 return -1;
490 }
491
492 nread += result;
493
494 }
495 }
496
497 return nread;
498}
499
500/* Read reply */
501
502int winbindd_read_reply(struct winbindd_response *response)
503{
504 int result1, result2 = 0;
505
506 if (!response) {
507 return -1;
508 }
509
510 /* Read fixed length response */
511
512 result1 = winbind_read_sock(response,
513 sizeof(struct winbindd_response));
514 if (result1 == -1) {
515 return -1;
516 }
517
518 /* We actually send the pointer value of the extra_data field from
519 the server. This has no meaning in the client's address space
520 so we clear it out. */
521
522 response->extra_data.data = NULL;
523
524 /* Read variable length response */
525
526 if (response->length > sizeof(struct winbindd_response)) {
527 int extra_data_len = response->length -
528 sizeof(struct winbindd_response);
529
530 /* Mallocate memory for extra data */
531
532 if (!(response->extra_data.data = malloc(extra_data_len))) {
533 return -1;
534 }
535
536 result2 = winbind_read_sock(response->extra_data.data,
537 extra_data_len);
538 if (result2 == -1) {
539 winbindd_free_response(response);
540 return -1;
541 }
542 }
543
544 /* Return total amount of data read */
545
546 return result1 + result2;
547}
548
549/*
550 * send simple types of requests
551 */
552
553NSS_STATUS winbindd_send_request(int req_type, int need_priv,
554 struct winbindd_request *request)
555{
556 struct winbindd_request lrequest;
557
558 /* Check for our tricky environment variable */
559
560 if (winbind_env_set()) {
561 return NSS_STATUS_NOTFOUND;
562 }
563
564 if (!request) {
565 ZERO_STRUCT(lrequest);
566 request = &lrequest;
567 }
568
569 /* Fill in request and send down pipe */
570
571 winbindd_init_request(request, req_type);
572
573 if (winbind_write_sock(request, sizeof(*request),
574 request->wb_flags & WBFLAG_RECURSE,
575 need_priv) == -1)
576 {
577 /* Set ENOENT for consistency. Required by some apps */
578 errno = ENOENT;
579
580 return NSS_STATUS_UNAVAIL;
581 }
582
583 if ((request->extra_len != 0) &&
584 (winbind_write_sock(request->extra_data.data,
585 request->extra_len,
586 request->wb_flags & WBFLAG_RECURSE,
587 need_priv) == -1))
588 {
589 /* Set ENOENT for consistency. Required by some apps */
590 errno = ENOENT;
591
592 return NSS_STATUS_UNAVAIL;
593 }
594
595 return NSS_STATUS_SUCCESS;
596}
597
598/*
599 * Get results from winbindd request
600 */
601
602NSS_STATUS winbindd_get_response(struct winbindd_response *response)
603{
604 struct winbindd_response lresponse;
605
606 if (!response) {
607 ZERO_STRUCT(lresponse);
608 response = &lresponse;
609 }
610
611 init_response(response);
612
613 /* Wait for reply */
614 if (winbindd_read_reply(response) == -1) {
615 /* Set ENOENT for consistency. Required by some apps */
616 errno = ENOENT;
617
618 return NSS_STATUS_UNAVAIL;
619 }
620
621 /* Throw away extra data if client didn't request it */
622 if (response == &lresponse) {
623 winbindd_free_response(response);
624 }
625
626 /* Copy reply data from socket */
627 if (response->result != WINBINDD_OK) {
628 return NSS_STATUS_NOTFOUND;
629 }
630
631 return NSS_STATUS_SUCCESS;
632}
633
634/* Handle simple types of requests */
635
636NSS_STATUS winbindd_request_response(int req_type,
637 struct winbindd_request *request,
638 struct winbindd_response *response)
639{
640 NSS_STATUS status = NSS_STATUS_UNAVAIL;
641 int count = 0;
642
643 while ((status == NSS_STATUS_UNAVAIL) && (count < 10)) {
644 status = winbindd_send_request(req_type, 0, request);
645 if (status != NSS_STATUS_SUCCESS)
646 return(status);
647 status = winbindd_get_response(response);
648 count += 1;
649 }
650
651 return status;
652}
653
654NSS_STATUS winbindd_priv_request_response(int req_type,
655 struct winbindd_request *request,
656 struct winbindd_response *response)
657{
658 NSS_STATUS status = NSS_STATUS_UNAVAIL;
659 int count = 0;
660
661 while ((status == NSS_STATUS_UNAVAIL) && (count < 10)) {
662 status = winbindd_send_request(req_type, 1, request);
663 if (status != NSS_STATUS_SUCCESS)
664 return(status);
665 status = winbindd_get_response(response);
666 count += 1;
667 }
668
669 return status;
670}
671
672/*************************************************************************
673 ************************************************************************/
674
675const char *nss_err_str(NSS_STATUS ret)
676{
677 switch (ret) {
678 case NSS_STATUS_TRYAGAIN:
679 return "NSS_STATUS_TRYAGAIN";
680 case NSS_STATUS_SUCCESS:
681 return "NSS_STATUS_SUCCESS";
682 case NSS_STATUS_NOTFOUND:
683 return "NSS_STATUS_NOTFOUND";
684 case NSS_STATUS_UNAVAIL:
685 return "NSS_STATUS_UNAVAIL";
686#ifdef NSS_STATUS_RETURN
687 case NSS_STATUS_RETURN:
688 return "NSS_STATUS_RETURN";
689#endif
690 default:
691 return "UNKNOWN RETURN CODE!!!!!!!";
692 }
693}
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