source: trunk-3.0/source/nsswitch/wb_common.c@ 102

Last change on this file since 102 was 71, checked in by Paul Smedley, 18 years ago

Update source to 3.0.26a
File size: 14.4 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 Library General Public
13 License as published by the Free Software Foundation; either
14 version 2 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 Library General Public
22 License along with this library; if not, write to the
23 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
24 Boston, MA 02111-1307, USA.
25*/
26
27#include "winbind_client.h"
28
29BOOL winbind_env_set( void );
30BOOL winbind_off( void );
31BOOL winbind_on( void );
32
33/* Global variables. These are effectively the client state information */
34
35int winbindd_fd = -1; /* fd for winbindd socket */
36static int is_privileged = 0;
37
38/* Free a response structure */
39
40void free_response(struct winbindd_response *response)
41{
42 /* Free any allocated extra_data */
43
44 if (response)
45 SAFE_FREE(response->extra_data.data);
46}
47
48/* Initialise a request structure */
49
50void init_request(struct winbindd_request *request, int request_type)
51{
52 request->length = sizeof(struct winbindd_request);
53
54 request->cmd = (enum winbindd_cmd)request_type;
55 request->pid = getpid();
56
57}
58
59/* Initialise a response structure */
60
61static void init_response(struct winbindd_response *response)
62{
63 /* Initialise return value */
64
65 response->result = WINBINDD_ERROR;
66}
67
68/* Close established socket */
69
70void close_sock(void)
71{
72 if (winbindd_fd != -1) {
73 close(winbindd_fd);
74 winbindd_fd = -1;
75 }
76}
77
78#define CONNECT_TIMEOUT 30
79
80/* Make sure socket handle isn't stdin, stdout or stderr */
81#define RECURSION_LIMIT 3
82
83static int make_nonstd_fd_internals(int fd, int limit /* Recursion limiter */)
84{
85 int new_fd;
86 if (fd >= 0 && fd <= 2) {
87#ifdef F_DUPFD
88 if ((new_fd = fcntl(fd, F_DUPFD, 3)) == -1) {
89 return -1;
90 }
91 /* Paranoia */
92 if (new_fd < 3) {
93 close(new_fd);
94 return -1;
95 }
96 close(fd);
97 return new_fd;
98#else
99 if (limit <= 0)
100 return -1;
101
102 new_fd = dup(fd);
103 if (new_fd == -1)
104 return -1;
105
106 /* use the program stack to hold our list of FDs to close */
107 new_fd = make_nonstd_fd_internals(new_fd, limit - 1);
108 close(fd);
109 return new_fd;
110#endif
111 }
112 return fd;
113}
114
115/****************************************************************************
116 Set a fd into blocking/nonblocking mode. Uses POSIX O_NONBLOCK if available,
117 else
118 if SYSV use O_NDELAY
119 if BSD use FNDELAY
120 Set close on exec also.
121****************************************************************************/
122
123static int make_safe_fd(int fd)
124{
125 int result, flags;
126 int new_fd = make_nonstd_fd_internals(fd, RECURSION_LIMIT);
127 if (new_fd == -1) {
128 close(fd);
129 return -1;
130 }
131
132 /* Socket should be nonblocking. */
133#ifdef O_NONBLOCK
134#define FLAG_TO_SET O_NONBLOCK
135#else
136#ifdef SYSV
137#define FLAG_TO_SET O_NDELAY
138#else /* BSD */
139#define FLAG_TO_SET FNDELAY
140#endif
141#endif
142
143 if ((flags = fcntl(new_fd, F_GETFL)) == -1) {
144 close(new_fd);
145 return -1;
146 }
147
148 flags |= FLAG_TO_SET;
149 if (fcntl(new_fd, F_SETFL, flags) == -1) {
150 close(new_fd);
151 return -1;
152 }
153
154#undef FLAG_TO_SET
155
156 /* Socket should be closed on exec() */
157#ifdef FD_CLOEXEC
158 result = flags = fcntl(new_fd, F_GETFD, 0);
159 if (flags >= 0) {
160 flags |= FD_CLOEXEC;
161 result = fcntl( new_fd, F_SETFD, flags );
162 }
163 if (result < 0) {
164 close(new_fd);
165 return -1;
166 }
167#endif
168 return new_fd;
169}
170
171/* Connect to winbindd socket */
172
173static int winbind_named_pipe_sock(const char *dir)
174{
175 struct sockaddr_un sunaddr;
176 struct stat st;
177 pstring path;
178 int fd;
179 int wait_time;
180 int slept;
181
182 /* Check permissions on unix socket directory */
183
184 if (lstat(dir, &st) == -1) {
185 return -1;
186 }
187
188 if (!S_ISDIR(st.st_mode) ||
189 (st.st_uid != 0 && st.st_uid != geteuid())) {
190 return -1;
191 }
192
193 /* Connect to socket */
194
195 strncpy(path, dir, sizeof(path) - 1);
196 path[sizeof(path) - 1] = '\0';
197
198 strncat(path, "/", sizeof(path) - 1 - strlen(path));
199 path[sizeof(path) - 1] = '\0';
200
201 strncat(path, WINBINDD_SOCKET_NAME, sizeof(path) - 1 - strlen(path));
202 path[sizeof(path) - 1] = '\0';
203
204 ZERO_STRUCT(sunaddr);
205 sunaddr.sun_family = AF_UNIX;
206 strncpy(sunaddr.sun_path, path, sizeof(sunaddr.sun_path) - 1);
207
208 /* If socket file doesn't exist, don't bother trying to connect
209 with retry. This is an attempt to make the system usable when
210 the winbindd daemon is not running. */
211
212 if (lstat(path, &st) == -1) {
213 return -1;
214 }
215
216 /* Check permissions on unix socket file */
217
218 if (!S_ISSOCK(st.st_mode) ||
219 (st.st_uid != 0 && st.st_uid != geteuid())) {
220 return -1;
221 }
222
223 /* Connect to socket */
224
225 if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) {
226 return -1;
227 }
228
229 /* Set socket non-blocking and close on exec. */
230
231 if ((fd = make_safe_fd( fd)) == -1) {
232 return fd;
233 }
234
235 for (wait_time = 0; connect(fd, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) == -1;
236 wait_time += slept) {
237 struct timeval tv;
238 fd_set w_fds;
239 int ret;
240 int connect_errno = 0;
241 socklen_t errnosize;
242
243 if (wait_time >= CONNECT_TIMEOUT)
244 goto error_out;
245
246 switch (errno) {
247 case EINPROGRESS:
248 FD_ZERO(&w_fds);
249 FD_SET(fd, &w_fds);
250 tv.tv_sec = CONNECT_TIMEOUT - wait_time;
251 tv.tv_usec = 0;
252
253 ret = select(fd + 1, NULL, &w_fds, NULL, &tv);
254
255 if (ret > 0) {
256 errnosize = sizeof(connect_errno);
257
258 ret = getsockopt(fd, SOL_SOCKET,
259 SO_ERROR, &connect_errno, &errnosize);
260
261 if (ret >= 0 && connect_errno == 0) {
262 /* Connect succeed */
263 goto out;
264 }
265 }
266
267 slept = CONNECT_TIMEOUT;
268 break;
269 case EAGAIN:
270 slept = rand() % 3 + 1;
271 sleep(slept);
272 break;
273 default:
274 goto error_out;
275 }
276
277 }
278
279 out:
280
281 return fd;
282
283 error_out:
284
285 close(fd);
286 return -1;
287}
288
289/* Connect to winbindd socket */
290
291static int winbind_open_pipe_sock(int recursing, int need_priv)
292{
293#ifdef HAVE_UNIXSOCKET
294 static pid_t our_pid;
295 struct winbindd_request request;
296 struct winbindd_response response;
297 ZERO_STRUCT(request);
298 ZERO_STRUCT(response);
299
300 if (our_pid != getpid()) {
301 close_sock();
302 our_pid = getpid();
303 }
304
305 if ((need_priv != 0) && (is_privileged == 0)) {
306 close_sock();
307 }
308
309 if (winbindd_fd != -1) {
310 return winbindd_fd;
311 }
312
313 if (recursing) {
314 return -1;
315 }
316
317 if ((winbindd_fd = winbind_named_pipe_sock(WINBINDD_SOCKET_DIR)) == -1) {
318 return -1;
319 }
320
321 is_privileged = 0;
322
323 /* version-check the socket */
324
325 request.flags = WBFLAG_RECURSE;
326 if ((winbindd_request_response(WINBINDD_INTERFACE_VERSION, &request, &response) != NSS_STATUS_SUCCESS) || (response.data.interface_version != WINBIND_INTERFACE_VERSION)) {
327 close_sock();
328 return -1;
329 }
330
331 /* try and get priv pipe */
332
333 request.flags = WBFLAG_RECURSE;
334 if (winbindd_request_response(WINBINDD_PRIV_PIPE_DIR, &request, &response) == NSS_STATUS_SUCCESS) {
335 int fd;
336 if ((fd = winbind_named_pipe_sock((char *)response.extra_data.data)) != -1) {
337 close(winbindd_fd);
338 winbindd_fd = fd;
339 is_privileged = 1;
340 }
341 }
342
343 if ((need_priv != 0) && (is_privileged == 0)) {
344 return -1;
345 }
346
347 SAFE_FREE(response.extra_data.data);
348
349 return winbindd_fd;
350#else
351 return -1;
352#endif /* HAVE_UNIXSOCKET */
353}
354
355/* Write data to winbindd socket */
356
357int write_sock(void *buffer, int count, int recursing, int need_priv)
358{
359 int result, nwritten;
360
361 /* Open connection to winbind daemon */
362
363 restart:
364
365 if (winbind_open_pipe_sock(recursing, need_priv) == -1) {
366 return -1;
367 }
368
369 /* Write data to socket */
370
371 nwritten = 0;
372
373 while(nwritten < count) {
374 struct timeval tv;
375 fd_set r_fds;
376
377 /* Catch pipe close on other end by checking if a read()
378 call would not block by calling select(). */
379
380 FD_ZERO(&r_fds);
381 FD_SET(winbindd_fd, &r_fds);
382 ZERO_STRUCT(tv);
383
384 if (select(winbindd_fd + 1, &r_fds, NULL, NULL, &tv) == -1) {
385 close_sock();
386 return -1; /* Select error */
387 }
388
389 /* Write should be OK if fd not available for reading */
390
391 if (!FD_ISSET(winbindd_fd, &r_fds)) {
392
393 /* Do the write */
394
395 result = write(winbindd_fd,
396 (char *)buffer + nwritten,
397 count - nwritten);
398
399 if ((result == -1) || (result == 0)) {
400
401 /* Write failed */
402
403 close_sock();
404 return -1;
405 }
406
407 nwritten += result;
408
409 } else {
410
411 /* Pipe has closed on remote end */
412
413 close_sock();
414 goto restart;
415 }
416 }
417
418 return nwritten;
419}
420
421/* Read data from winbindd socket */
422
423static int read_sock(void *buffer, int count)
424{
425 int nread = 0;
426 int total_time = 0, selret;
427
428 if (winbindd_fd == -1) {
429 return -1;
430 }
431
432 /* Read data from socket */
433 while(nread < count) {
434 struct timeval tv;
435 fd_set r_fds;
436
437 /* Catch pipe close on other end by checking if a read()
438 call would not block by calling select(). */
439
440 FD_ZERO(&r_fds);
441 FD_SET(winbindd_fd, &r_fds);
442 ZERO_STRUCT(tv);
443 /* Wait for 5 seconds for a reply. May need to parameterise this... */
444 tv.tv_sec = 5;
445
446 if ((selret = select(winbindd_fd + 1, &r_fds, NULL, NULL, &tv)) == -1) {
447 close_sock();
448 return -1; /* Select error */
449 }
450
451 if (selret == 0) {
452 /* Not ready for read yet... */
453 if (total_time >= 30) {
454 /* Timeout */
455 close_sock();
456 return -1;
457 }
458 total_time += 5;
459 continue;
460 }
461
462 if (FD_ISSET(winbindd_fd, &r_fds)) {
463
464 /* Do the Read */
465
466 int result = read(winbindd_fd, (char *)buffer + nread,
467 count - nread);
468
469 if ((result == -1) || (result == 0)) {
470
471 /* Read failed. I think the only useful thing we
472 can do here is just return -1 and fail since the
473 transaction has failed half way through. */
474
475 close_sock();
476 return -1;
477 }
478
479 nread += result;
480
481 }
482 }
483
484 return nread;
485}
486
487/* Read reply */
488
489int read_reply(struct winbindd_response *response)
490{
491 int result1, result2 = 0;
492
493 if (!response) {
494 return -1;
495 }
496
497 /* Read fixed length response */
498
499 if ((result1 = read_sock(response, sizeof(struct winbindd_response)))
500 == -1) {
501
502 return -1;
503 }
504
505 /* We actually send the pointer value of the extra_data field from
506 the server. This has no meaning in the client's address space
507 so we clear it out. */
508
509 response->extra_data.data = NULL;
510
511 /* Read variable length response */
512
513 if (response->length > sizeof(struct winbindd_response)) {
514 int extra_data_len = response->length -
515 sizeof(struct winbindd_response);
516
517 /* Mallocate memory for extra data */
518
519 if (!(response->extra_data.data = malloc(extra_data_len))) {
520 return -1;
521 }
522
523 if ((result2 = read_sock(response->extra_data.data, extra_data_len))
524 == -1) {
525 free_response(response);
526 return -1;
527 }
528 }
529
530 /* Return total amount of data read */
531
532 return result1 + result2;
533}
534
535BOOL winbind_env_set( void )
536{
537 char *env;
538
539 if ((env=getenv(WINBINDD_DONT_ENV)) != NULL) {
540 if(strcmp(env, "1") == 0) {
541 return True;
542 }
543 }
544 return False;
545}
546
547/*
548 * send simple types of requests
549 */
550
551NSS_STATUS winbindd_send_request(int req_type, int need_priv,
552 struct winbindd_request *request)
553{
554 struct winbindd_request lrequest;
555
556 /* Check for our tricky environment variable */
557
558 if (winbind_env_set()) {
559 return NSS_STATUS_NOTFOUND;
560 }
561
562 if (!request) {
563 ZERO_STRUCT(lrequest);
564 request = &lrequest;
565 }
566
567 /* Fill in request and send down pipe */
568
569 init_request(request, req_type);
570
571 if (write_sock(request, sizeof(*request),
572 request->flags & WBFLAG_RECURSE, need_priv) == -1) {
573 return NSS_STATUS_UNAVAIL;
574 }
575
576 if ((request->extra_len != 0) &&
577 (write_sock(request->extra_data.data, request->extra_len,
578 request->flags & WBFLAG_RECURSE, need_priv) == -1)) {
579 return NSS_STATUS_UNAVAIL;
580 }
581
582 return NSS_STATUS_SUCCESS;
583}
584
585/*
586 * Get results from winbindd request
587 */
588
589NSS_STATUS winbindd_get_response(struct winbindd_response *response)
590{
591 struct winbindd_response lresponse;
592
593 if (!response) {
594 ZERO_STRUCT(lresponse);
595 response = &lresponse;
596 }
597
598 init_response(response);
599
600 /* Wait for reply */
601 if (read_reply(response) == -1) {
602 return NSS_STATUS_UNAVAIL;
603 }
604
605 /* Throw away extra data if client didn't request it */
606 if (response == &lresponse) {
607 free_response(response);
608 }
609
610 /* Copy reply data from socket */
611 if (response->result != WINBINDD_OK) {
612 return NSS_STATUS_NOTFOUND;
613 }
614
615 return NSS_STATUS_SUCCESS;
616}
617
618/* Handle simple types of requests */
619
620NSS_STATUS winbindd_request_response(int req_type,
621 struct winbindd_request *request,
622 struct winbindd_response *response)
623{
624 NSS_STATUS status = NSS_STATUS_UNAVAIL;
625 int count = 0;
626
627 while ((status == NSS_STATUS_UNAVAIL) && (count < 10)) {
628 status = winbindd_send_request(req_type, 0, request);
629 if (status != NSS_STATUS_SUCCESS)
630 return(status);
631 status = winbindd_get_response(response);
632 count += 1;
633 }
634
635 return status;
636}
637
638NSS_STATUS winbindd_priv_request_response(int req_type,
639 struct winbindd_request *request,
640 struct winbindd_response *response)
641{
642 NSS_STATUS status = NSS_STATUS_UNAVAIL;
643 int count = 0;
644
645 while ((status == NSS_STATUS_UNAVAIL) && (count < 10)) {
646 status = winbindd_send_request(req_type, 1, request);
647 if (status != NSS_STATUS_SUCCESS)
648 return(status);
649 status = winbindd_get_response(response);
650 count += 1;
651 }
652
653 return status;
654}
655
656/*************************************************************************
657 A couple of simple functions to disable winbindd lookups and re-
658 enable them
659 ************************************************************************/
660
661/* Use putenv() instead of setenv() in these functions as not all
662 environments have the latter. */
663
664BOOL winbind_off( void )
665{
666 static char *s = CONST_DISCARD(char *, WINBINDD_DONT_ENV "=1");
667
668 return putenv(s) != -1;
669}
670
671BOOL winbind_on( void )
672{
673 static char *s = CONST_DISCARD(char *, WINBINDD_DONT_ENV "=0");
674
675 return putenv(s) != -1;
676}
677
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