source: trunk/server/nsswitch/wb_common.c@ 559

Last change on this file since 559 was 414, checked in by Herwig Bauernfeind, 16 years ago

Samba 3.5.0: Initial import
File size: 13.9 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
64void winbind_close_sock(void)
65{
66 if (winbindd_fd != -1) {
67 close(winbindd_fd);
68 winbindd_fd = -1;
69 }
70}
71
72#define CONNECT_TIMEOUT 30
73
74/* Make sure socket handle isn't stdin, stdout or stderr */
75#define RECURSION_LIMIT 3
76
77static int make_nonstd_fd_internals(int fd, int limit /* Recursion limiter */)
78{
79 int new_fd;
80 if (fd >= 0 && fd <= 2) {
81#ifdef F_DUPFD
82 if ((new_fd = fcntl(fd, F_DUPFD, 3)) == -1) {
83 return -1;
84 }
85 /* Paranoia */
86 if (new_fd < 3) {
87 close(new_fd);
88 return -1;
89 }
90 close(fd);
91 return new_fd;
92#else
93 if (limit <= 0)
94 return -1;
95
96 new_fd = dup(fd);
97 if (new_fd == -1)
98 return -1;
99
100 /* use the program stack to hold our list of FDs to close */
101 new_fd = make_nonstd_fd_internals(new_fd, limit - 1);
102 close(fd);
103 return new_fd;
104#endif
105 }
106 return fd;
107}
108
109/****************************************************************************
110 Set a fd into blocking/nonblocking mode. Uses POSIX O_NONBLOCK if available,
111 else
112 if SYSV use O_NDELAY
113 if BSD use FNDELAY
114 Set close on exec also.
115****************************************************************************/
116
117static int make_safe_fd(int fd)
118{
119 int result, flags;
120 int new_fd = make_nonstd_fd_internals(fd, RECURSION_LIMIT);
121 if (new_fd == -1) {
122 close(fd);
123 return -1;
124 }
125
126 /* Socket should be nonblocking. */
127#ifdef O_NONBLOCK
128#define FLAG_TO_SET O_NONBLOCK
129#else
130#ifdef SYSV
131#define FLAG_TO_SET O_NDELAY
132#else /* BSD */
133#define FLAG_TO_SET FNDELAY
134#endif
135#endif
136
137 if ((flags = fcntl(new_fd, F_GETFL)) == -1) {
138 close(new_fd);
139 return -1;
140 }
141
142 flags |= FLAG_TO_SET;
143 if (fcntl(new_fd, F_SETFL, flags) == -1) {
144 close(new_fd);
145 return -1;
146 }
147
148#undef FLAG_TO_SET
149
150 /* Socket should be closed on exec() */
151#ifdef FD_CLOEXEC
152 result = flags = fcntl(new_fd, F_GETFD, 0);
153 if (flags >= 0) {
154 flags |= FD_CLOEXEC;
155 result = fcntl( new_fd, F_SETFD, flags );
156 }
157 if (result < 0) {
158 close(new_fd);
159 return -1;
160 }
161#endif
162 return new_fd;
163}
164
165/* Connect to winbindd socket */
166
167static int winbind_named_pipe_sock(const char *dir)
168{
169 struct sockaddr_un sunaddr;
170 struct stat st;
171 char *path = NULL;
172 int fd;
173 int wait_time;
174 int slept;
175
176 /* Check permissions on unix socket directory */
177
178 if (lstat(dir, &st) == -1) {
179 errno = ENOENT;
180 return -1;
181 }
182
183 if (!S_ISDIR(st.st_mode) ||
184 (st.st_uid != 0 && st.st_uid != geteuid())) {
185 errno = ENOENT;
186 return -1;
187 }
188
189 /* Connect to socket */
190
191 if (asprintf(&path, "%s/%s", dir, WINBINDD_SOCKET_NAME) < 0) {
192 return -1;
193 }
194
195 ZERO_STRUCT(sunaddr);
196 sunaddr.sun_family = AF_UNIX;
197 strncpy(sunaddr.sun_path, path, sizeof(sunaddr.sun_path) - 1);
198
199 /* If socket file doesn't exist, don't bother trying to connect
200 with retry. This is an attempt to make the system usable when
201 the winbindd daemon is not running. */
202
203 if (lstat(path, &st) == -1) {
204 errno = ENOENT;
205 SAFE_FREE(path);
206 return -1;
207 }
208
209 SAFE_FREE(path);
210 /* Check permissions on unix socket file */
211
212 if (!S_ISSOCK(st.st_mode) ||
213 (st.st_uid != 0 && st.st_uid != geteuid())) {
214 errno = ENOENT;
215 return -1;
216 }
217
218 /* Connect to socket */
219
220 if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) {
221 return -1;
222 }
223
224 /* Set socket non-blocking and close on exec. */
225
226 if ((fd = make_safe_fd( fd)) == -1) {
227 return fd;
228 }
229
230 for (wait_time = 0; connect(fd, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) == -1;
231 wait_time += slept) {
232 struct timeval tv;
233 fd_set w_fds;
234 int ret;
235 int connect_errno = 0;
236 socklen_t errnosize;
237
238 if (wait_time >= CONNECT_TIMEOUT)
239 goto error_out;
240
241 switch (errno) {
242 case EINPROGRESS:
243 FD_ZERO(&w_fds);
244 FD_SET(fd, &w_fds);
245 tv.tv_sec = CONNECT_TIMEOUT - wait_time;
246 tv.tv_usec = 0;
247
248 ret = select(fd + 1, NULL, &w_fds, NULL, &tv);
249
250 if (ret > 0) {
251 errnosize = sizeof(connect_errno);
252
253 ret = getsockopt(fd, SOL_SOCKET,
254 SO_ERROR, &connect_errno, &errnosize);
255
256 if (ret >= 0 && connect_errno == 0) {
257 /* Connect succeed */
258 goto out;
259 }
260 }
261
262 slept = CONNECT_TIMEOUT;
263 break;
264 case EAGAIN:
265 slept = rand() % 3 + 1;
266 sleep(slept);
267 break;
268 default:
269 goto error_out;
270 }
271
272 }
273
274 out:
275
276 return fd;
277
278 error_out:
279
280 close(fd);
281 return -1;
282}
283
284static const char *winbindd_socket_dir(void)
285{
286#ifdef SOCKET_WRAPPER
287 const char *env_dir;
288
289 env_dir = getenv(WINBINDD_SOCKET_DIR_ENVVAR);
290 if (env_dir) {
291 return env_dir;
292 }
293#endif
294
295 return WINBINDD_SOCKET_DIR;
296}
297
298/* Connect to winbindd socket */
299
300static int winbind_open_pipe_sock(int recursing, int need_priv)
301{
302#ifdef HAVE_UNIXSOCKET
303 static pid_t our_pid;
304 struct winbindd_request request;
305 struct winbindd_response response;
306 ZERO_STRUCT(request);
307 ZERO_STRUCT(response);
308
309 if (our_pid != getpid()) {
310 winbind_close_sock();
311 our_pid = getpid();
312 }
313
314 if ((need_priv != 0) && (is_privileged == 0)) {
315 winbind_close_sock();
316 }
317
318 if (winbindd_fd != -1) {
319 return winbindd_fd;
320 }
321
322 if (recursing) {
323 return -1;
324 }
325
326 if ((winbindd_fd = winbind_named_pipe_sock(winbindd_socket_dir())) == -1) {
327 return -1;
328 }
329
330 is_privileged = 0;
331
332 /* version-check the socket */
333
334 request.wb_flags = WBFLAG_RECURSE;
335 if ((winbindd_request_response(WINBINDD_INTERFACE_VERSION, &request, &response) != NSS_STATUS_SUCCESS) || (response.data.interface_version != WINBIND_INTERFACE_VERSION)) {
336 winbind_close_sock();
337 return -1;
338 }
339
340 /* try and get priv pipe */
341
342 request.wb_flags = WBFLAG_RECURSE;
343 if (winbindd_request_response(WINBINDD_PRIV_PIPE_DIR, &request, &response) == NSS_STATUS_SUCCESS) {
344 int fd;
345 if ((fd = winbind_named_pipe_sock((char *)response.extra_data.data)) != -1) {
346 close(winbindd_fd);
347 winbindd_fd = fd;
348 is_privileged = 1;
349 }
350 }
351
352 if ((need_priv != 0) && (is_privileged == 0)) {
353 return -1;
354 }
355
356 SAFE_FREE(response.extra_data.data);
357
358 return winbindd_fd;
359#else
360 return -1;
361#endif /* HAVE_UNIXSOCKET */
362}
363
364/* Write data to winbindd socket */
365
366int winbind_write_sock(void *buffer, int count, int recursing, int need_priv)
367{
368 int result, nwritten;
369
370 /* Open connection to winbind daemon */
371
372 restart:
373
374 if (winbind_open_pipe_sock(recursing, need_priv) == -1) {
375 errno = ENOENT;
376 return -1;
377 }
378
379 /* Write data to socket */
380
381 nwritten = 0;
382
383 while(nwritten < count) {
384 struct timeval tv;
385 fd_set r_fds;
386
387 /* Catch pipe close on other end by checking if a read()
388 call would not block by calling select(). */
389
390 FD_ZERO(&r_fds);
391 FD_SET(winbindd_fd, &r_fds);
392 ZERO_STRUCT(tv);
393
394 if (select(winbindd_fd + 1, &r_fds, NULL, NULL, &tv) == -1) {
395 winbind_close_sock();
396 return -1; /* Select error */
397 }
398
399 /* Write should be OK if fd not available for reading */
400
401 if (!FD_ISSET(winbindd_fd, &r_fds)) {
402
403 /* Do the write */
404
405 result = write(winbindd_fd,
406 (char *)buffer + nwritten,
407 count - nwritten);
408
409 if ((result == -1) || (result == 0)) {
410
411 /* Write failed */
412
413 winbind_close_sock();
414 return -1;
415 }
416
417 nwritten += result;
418
419 } else {
420
421 /* Pipe has closed on remote end */
422
423 winbind_close_sock();
424 goto restart;
425 }
426 }
427
428 return nwritten;
429}
430
431/* Read data from winbindd socket */
432
433int winbind_read_sock(void *buffer, int count)
434{
435 int nread = 0;
436 int total_time = 0, selret;
437
438 if (winbindd_fd == -1) {
439 return -1;
440 }
441
442 /* Read data from socket */
443 while(nread < count) {
444 struct timeval tv;
445 fd_set r_fds;
446
447 /* Catch pipe close on other end by checking if a read()
448 call would not block by calling select(). */
449
450 FD_ZERO(&r_fds);
451 FD_SET(winbindd_fd, &r_fds);
452 ZERO_STRUCT(tv);
453 /* Wait for 5 seconds for a reply. May need to parameterise this... */
454 tv.tv_sec = 5;
455
456 if ((selret = select(winbindd_fd + 1, &r_fds, NULL, NULL, &tv)) == -1) {
457 winbind_close_sock();
458 return -1; /* Select error */
459 }
460
461 if (selret == 0) {
462 /* Not ready for read yet... */
463 if (total_time >= 30) {
464 /* Timeout */
465 winbind_close_sock();
466 return -1;
467 }
468 total_time += 5;
469 continue;
470 }
471
472 if (FD_ISSET(winbindd_fd, &r_fds)) {
473
474 /* Do the Read */
475
476 int result = read(winbindd_fd, (char *)buffer + nread,
477 count - nread);
478
479 if ((result == -1) || (result == 0)) {
480
481 /* Read failed. I think the only useful thing we
482 can do here is just return -1 and fail since the
483 transaction has failed half way through. */
484
485 winbind_close_sock();
486 return -1;
487 }
488
489 nread += result;
490
491 }
492 }
493
494 return nread;
495}
496
497/* Read reply */
498
499int winbindd_read_reply(struct winbindd_response *response)
500{
501 int result1, result2 = 0;
502
503 if (!response) {
504 return -1;
505 }
506
507 /* Read fixed length response */
508
509 result1 = winbind_read_sock(response,
510 sizeof(struct winbindd_response));
511 if (result1 == -1) {
512 return -1;
513 }
514
515 /* We actually send the pointer value of the extra_data field from
516 the server. This has no meaning in the client's address space
517 so we clear it out. */
518
519 response->extra_data.data = NULL;
520
521 /* Read variable length response */
522
523 if (response->length > sizeof(struct winbindd_response)) {
524 int extra_data_len = response->length -
525 sizeof(struct winbindd_response);
526
527 /* Mallocate memory for extra data */
528
529 if (!(response->extra_data.data = malloc(extra_data_len))) {
530 return -1;
531 }
532
533 result2 = winbind_read_sock(response->extra_data.data,
534 extra_data_len);
535 if (result2 == -1) {
536 winbindd_free_response(response);
537 return -1;
538 }
539 }
540
541 /* Return total amount of data read */
542
543 return result1 + result2;
544}
545
546/*
547 * send simple types of requests
548 */
549
550NSS_STATUS winbindd_send_request(int req_type, int need_priv,
551 struct winbindd_request *request)
552{
553 struct winbindd_request lrequest;
554
555 /* Check for our tricky environment variable */
556
557 if (winbind_env_set()) {
558 return NSS_STATUS_NOTFOUND;
559 }
560
561 if (!request) {
562 ZERO_STRUCT(lrequest);
563 request = &lrequest;
564 }
565
566 /* Fill in request and send down pipe */
567
568 winbindd_init_request(request, req_type);
569
570 if (winbind_write_sock(request, sizeof(*request),
571 request->wb_flags & WBFLAG_RECURSE,
572 need_priv) == -1)
573 {
574 /* Set ENOENT for consistency. Required by some apps */
575 errno = ENOENT;
576
577 return NSS_STATUS_UNAVAIL;
578 }
579
580 if ((request->extra_len != 0) &&
581 (winbind_write_sock(request->extra_data.data,
582 request->extra_len,
583 request->wb_flags & WBFLAG_RECURSE,
584 need_priv) == -1))
585 {
586 /* Set ENOENT for consistency. Required by some apps */
587 errno = ENOENT;
588
589 return NSS_STATUS_UNAVAIL;
590 }
591
592 return NSS_STATUS_SUCCESS;
593}
594
595/*
596 * Get results from winbindd request
597 */
598
599NSS_STATUS winbindd_get_response(struct winbindd_response *response)
600{
601 struct winbindd_response lresponse;
602
603 if (!response) {
604 ZERO_STRUCT(lresponse);
605 response = &lresponse;
606 }
607
608 init_response(response);
609
610 /* Wait for reply */
611 if (winbindd_read_reply(response) == -1) {
612 /* Set ENOENT for consistency. Required by some apps */
613 errno = ENOENT;
614
615 return NSS_STATUS_UNAVAIL;
616 }
617
618 /* Throw away extra data if client didn't request it */
619 if (response == &lresponse) {
620 winbindd_free_response(response);
621 }
622
623 /* Copy reply data from socket */
624 if (response->result != WINBINDD_OK) {
625 return NSS_STATUS_NOTFOUND;
626 }
627
628 return NSS_STATUS_SUCCESS;
629}
630
631/* Handle simple types of requests */
632
633NSS_STATUS winbindd_request_response(int req_type,
634 struct winbindd_request *request,
635 struct winbindd_response *response)
636{
637 NSS_STATUS status = NSS_STATUS_UNAVAIL;
638 int count = 0;
639
640 while ((status == NSS_STATUS_UNAVAIL) && (count < 10)) {
641 status = winbindd_send_request(req_type, 0, request);
642 if (status != NSS_STATUS_SUCCESS)
643 return(status);
644 status = winbindd_get_response(response);
645 count += 1;
646 }
647
648 return status;
649}
650
651NSS_STATUS winbindd_priv_request_response(int req_type,
652 struct winbindd_request *request,
653 struct winbindd_response *response)
654{
655 NSS_STATUS status = NSS_STATUS_UNAVAIL;
656 int count = 0;
657
658 while ((status == NSS_STATUS_UNAVAIL) && (count < 10)) {
659 status = winbindd_send_request(req_type, 1, request);
660 if (status != NSS_STATUS_SUCCESS)
661 return(status);
662 status = winbindd_get_response(response);
663 count += 1;
664 }
665
666 return status;
667}
668
669/*************************************************************************
670 ************************************************************************/
671
672const char *nss_err_str(NSS_STATUS ret)
673{
674 switch (ret) {
675 case NSS_STATUS_TRYAGAIN:
676 return "NSS_STATUS_TRYAGAIN";
677 case NSS_STATUS_SUCCESS:
678 return "NSS_STATUS_SUCCESS";
679 case NSS_STATUS_NOTFOUND:
680 return "NSS_STATUS_NOTFOUND";
681 case NSS_STATUS_UNAVAIL:
682 return "NSS_STATUS_UNAVAIL";
683#ifdef NSS_STATUS_RETURN
684 case NSS_STATUS_RETURN:
685 return "NSS_STATUS_RETURN";
686#endif
687 default:
688 return "UNKNOWN RETURN CODE!!!!!!!";
689 }
690}
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