source: branches/samba-3.0/source/nsswitch/wb_common.c@ 612

Last change on this file since 612 was 165, checked in by Paul Smedley, 17 years ago

Add 'missing' 3.0.34 diffs
File size: 14.1 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 errno = ENOENT;
186 return -1;
187 }
188
189 if (!S_ISDIR(st.st_mode) ||
190 (st.st_uid != 0 && st.st_uid != geteuid())) {
191 errno = ENOENT;
192 return -1;
193 }
194
195 /* Connect to socket */
196
197 strncpy(path, dir, sizeof(path) - 1);
198 path[sizeof(path) - 1] = '\0';
199
200 strncat(path, "/", sizeof(path) - 1 - strlen(path));
201 path[sizeof(path) - 1] = '\0';
202
203 strncat(path, WINBINDD_SOCKET_NAME, sizeof(path) - 1 - strlen(path));
204 path[sizeof(path) - 1] = '\0';
205
206 ZERO_STRUCT(sunaddr);
207 sunaddr.sun_family = AF_UNIX;
208 strncpy(sunaddr.sun_path, path, sizeof(sunaddr.sun_path) - 1);
209
210 /* If socket file doesn't exist, don't bother trying to connect
211 with retry. This is an attempt to make the system usable when
212 the winbindd daemon is not running. */
213
214 if (lstat(path, &st) == -1) {
215 errno = ENOENT;
216 return -1;
217 }
218
219 /* Check permissions on unix socket file */
220
221 if (!S_ISSOCK(st.st_mode) ||
222 (st.st_uid != 0 && st.st_uid != geteuid())) {
223 errno = ENOENT;
224 return -1;
225 }
226
227 /* Connect to socket */
228
229 if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) {
230 return -1;
231 }
232
233 /* Set socket non-blocking and close on exec. */
234
235 if ((fd = make_safe_fd( fd)) == -1) {
236 return fd;
237 }
238
239 for (wait_time = 0; connect(fd, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) == -1;
240 wait_time += slept) {
241 struct timeval tv;
242 fd_set w_fds;
243 int ret;
244 int connect_errno = 0;
245 socklen_t errnosize;
246
247 if (wait_time >= CONNECT_TIMEOUT)
248 goto error_out;
249
250 switch (errno) {
251 case EINPROGRESS:
252 FD_ZERO(&w_fds);
253 FD_SET(fd, &w_fds);
254 tv.tv_sec = CONNECT_TIMEOUT - wait_time;
255 tv.tv_usec = 0;
256
257 ret = select(fd + 1, NULL, &w_fds, NULL, &tv);
258
259 if (ret > 0) {
260 errnosize = sizeof(connect_errno);
261
262 ret = getsockopt(fd, SOL_SOCKET,
263 SO_ERROR, &connect_errno, &errnosize);
264
265 if (ret >= 0 && connect_errno == 0) {
266 /* Connect succeed */
267 goto out;
268 }
269 }
270
271 slept = CONNECT_TIMEOUT;
272 break;
273 case EAGAIN:
274 slept = rand() % 3 + 1;
275 sleep(slept);
276 break;
277 default:
278 goto error_out;
279 }
280
281 }
282
283 out:
284
285 return fd;
286
287 error_out:
288
289 close(fd);
290 return -1;
291}
292
293/* Connect to winbindd socket */
294
295static int winbind_open_pipe_sock(int recursing, int need_priv)
296{
297#ifdef HAVE_UNIXSOCKET
298 static pid_t our_pid;
299 struct winbindd_request request;
300 struct winbindd_response response;
301 ZERO_STRUCT(request);
302 ZERO_STRUCT(response);
303
304 if (our_pid != getpid()) {
305 close_sock();
306 our_pid = getpid();
307 }
308
309 if ((need_priv != 0) && (is_privileged == 0)) {
310 close_sock();
311 }
312
313 if (winbindd_fd != -1) {
314 return winbindd_fd;
315 }
316
317 if (recursing) {
318 return -1;
319 }
320
321 if ((winbindd_fd = winbind_named_pipe_sock(WINBINDD_SOCKET_DIR)) == -1) {
322 return -1;
323 }
324
325 is_privileged = 0;
326
327 /* version-check the socket */
328
329 request.flags = WBFLAG_RECURSE;
330 if ((winbindd_request_response(WINBINDD_INTERFACE_VERSION, &request, &response) != NSS_STATUS_SUCCESS) || (response.data.interface_version != WINBIND_INTERFACE_VERSION)) {
331 close_sock();
332 return -1;
333 }
334
335 /* try and get priv pipe */
336
337 request.flags = WBFLAG_RECURSE;
338 if (winbindd_request_response(WINBINDD_PRIV_PIPE_DIR, &request, &response) == NSS_STATUS_SUCCESS) {
339 int fd;
340 if ((fd = winbind_named_pipe_sock((char *)response.extra_data.data)) != -1) {
341 close(winbindd_fd);
342 winbindd_fd = fd;
343 is_privileged = 1;
344 }
345 }
346
347 if ((need_priv != 0) && (is_privileged == 0)) {
348 return -1;
349 }
350
351 SAFE_FREE(response.extra_data.data);
352
353 return winbindd_fd;
354#else
355 return -1;
356#endif /* HAVE_UNIXSOCKET */
357}
358
359/* Write data to winbindd socket */
360
361int write_sock(void *buffer, int count, int recursing, int need_priv)
362{
363 int result, nwritten;
364
365 /* Open connection to winbind daemon */
366
367 restart:
368
369 if (winbind_open_pipe_sock(recursing, need_priv) == -1) {
370 errno = ENOENT;
371 return -1;
372 }
373
374 /* Write data to socket */
375
376 nwritten = 0;
377
378 while(nwritten < count) {
379 struct timeval tv;
380 fd_set r_fds;
381
382 /* Catch pipe close on other end by checking if a read()
383 call would not block by calling select(). */
384
385 FD_ZERO(&r_fds);
386 FD_SET(winbindd_fd, &r_fds);
387 ZERO_STRUCT(tv);
388
389 if (select(winbindd_fd + 1, &r_fds, NULL, NULL, &tv) == -1) {
390 close_sock();
391 return -1; /* Select error */
392 }
393
394 /* Write should be OK if fd not available for reading */
395
396 if (!FD_ISSET(winbindd_fd, &r_fds)) {
397
398 /* Do the write */
399
400 result = write(winbindd_fd,
401 (char *)buffer + nwritten,
402 count - nwritten);
403
404 if ((result == -1) || (result == 0)) {
405
406 /* Write failed */
407
408 close_sock();
409 return -1;
410 }
411
412 nwritten += result;
413
414 } else {
415
416 /* Pipe has closed on remote end */
417
418 close_sock();
419 goto restart;
420 }
421 }
422
423 return nwritten;
424}
425
426/* Read data from winbindd socket */
427
428static int read_sock(void *buffer, int count)
429{
430 int nread = 0;
431 int total_time = 0, selret;
432
433 if (winbindd_fd == -1) {
434 return -1;
435 }
436
437 /* Read data from socket */
438 while(nread < count) {
439 struct timeval tv;
440 fd_set r_fds;
441
442 /* Catch pipe close on other end by checking if a read()
443 call would not block by calling select(). */
444
445 FD_ZERO(&r_fds);
446 FD_SET(winbindd_fd, &r_fds);
447 ZERO_STRUCT(tv);
448 /* Wait for 5 seconds for a reply. May need to parameterise this... */
449 tv.tv_sec = 5;
450
451 if ((selret = select(winbindd_fd + 1, &r_fds, NULL, NULL, &tv)) == -1) {
452 close_sock();
453 return -1; /* Select error */
454 }
455
456 if (selret == 0) {
457 /* Not ready for read yet... */
458 if (total_time >= 30) {
459 /* Timeout */
460 close_sock();
461 return -1;
462 }
463 total_time += 5;
464 continue;
465 }
466
467 if (FD_ISSET(winbindd_fd, &r_fds)) {
468
469 /* Do the Read */
470
471 int result = read(winbindd_fd, (char *)buffer + nread,
472 count - nread);
473
474 if ((result == -1) || (result == 0)) {
475
476 /* Read failed. I think the only useful thing we
477 can do here is just return -1 and fail since the
478 transaction has failed half way through. */
479
480 close_sock();
481 return -1;
482 }
483
484 nread += result;
485
486 }
487 }
488
489 return nread;
490}
491
492/* Read reply */
493
494int read_reply(struct winbindd_response *response)
495{
496 int result1, result2 = 0;
497
498 if (!response) {
499 return -1;
500 }
501
502 /* Read fixed length response */
503
504 if ((result1 = read_sock(response, sizeof(struct winbindd_response)))
505 == -1) {
506
507 return -1;
508 }
509
510 /* We actually send the pointer value of the extra_data field from
511 the server. This has no meaning in the client's address space
512 so we clear it out. */
513
514 response->extra_data.data = NULL;
515
516 /* Read variable length response */
517
518 if (response->length > sizeof(struct winbindd_response)) {
519 int extra_data_len = response->length -
520 sizeof(struct winbindd_response);
521
522 /* Mallocate memory for extra data */
523
524 if (!(response->extra_data.data = malloc(extra_data_len))) {
525 return -1;
526 }
527
528 if ((result2 = read_sock(response->extra_data.data, extra_data_len))
529 == -1) {
530 free_response(response);
531 return -1;
532 }
533 }
534
535 /* Return total amount of data read */
536
537 return result1 + result2;
538}
539
540BOOL winbind_env_set( void )
541{
542 char *env;
543
544 if ((env=getenv(WINBINDD_DONT_ENV)) != NULL) {
545 if(strcmp(env, "1") == 0) {
546 return True;
547 }
548 }
549 return False;
550}
551
552/*
553 * send simple types of requests
554 */
555
556NSS_STATUS winbindd_send_request(int req_type, int need_priv,
557 struct winbindd_request *request)
558{
559 struct winbindd_request lrequest;
560
561 /* Check for our tricky environment variable */
562
563 if (winbind_env_set()) {
564 return NSS_STATUS_NOTFOUND;
565 }
566
567 if (!request) {
568 ZERO_STRUCT(lrequest);
569 request = &lrequest;
570 }
571
572 /* Fill in request and send down pipe */
573
574 init_request(request, req_type);
575
576 if (write_sock(request, sizeof(*request),
577 request->flags & WBFLAG_RECURSE, need_priv) == -1) {
578 /* Set ENOENT for consistency. Required by some apps */
579 errno = ENOENT;
580
581 return NSS_STATUS_UNAVAIL;
582 }
583
584 if ((request->extra_len != 0) &&
585 (write_sock(request->extra_data.data, request->extra_len,
586 request->flags & WBFLAG_RECURSE, need_priv) == -1)) {
587 /* Set ENOENT for consistency. Required by some apps */
588 errno = ENOENT;
589
590 return NSS_STATUS_UNAVAIL;
591 }
592
593 return NSS_STATUS_SUCCESS;
594}
595
596/*
597 * Get results from winbindd request
598 */
599
600NSS_STATUS winbindd_get_response(struct winbindd_response *response)
601{
602 struct winbindd_response lresponse;
603
604 if (!response) {
605 ZERO_STRUCT(lresponse);
606 response = &lresponse;
607 }
608
609 init_response(response);
610
611 /* Wait for reply */
612 if (read_reply(response) == -1) {
613 /* Set ENOENT for consistency. Required by some apps */
614 errno = ENOENT;
615
616 return NSS_STATUS_UNAVAIL;
617 }
618
619 /* Throw away extra data if client didn't request it */
620 if (response == &lresponse) {
621 free_response(response);
622 }
623
624 /* Copy reply data from socket */
625 if (response->result != WINBINDD_OK) {
626 return NSS_STATUS_NOTFOUND;
627 }
628
629 return NSS_STATUS_SUCCESS;
630}
631
632/* Handle simple types of requests */
633
634NSS_STATUS winbindd_request_response(int req_type,
635 struct winbindd_request *request,
636 struct winbindd_response *response)
637{
638 NSS_STATUS status = NSS_STATUS_UNAVAIL;
639 int count = 0;
640
641 while ((status == NSS_STATUS_UNAVAIL) && (count < 10)) {
642 status = winbindd_send_request(req_type, 0, request);
643 if (status != NSS_STATUS_SUCCESS)
644 return(status);
645 status = winbindd_get_response(response);
646 count += 1;
647 }
648
649 return status;
650}
651
652NSS_STATUS winbindd_priv_request_response(int req_type,
653 struct winbindd_request *request,
654 struct winbindd_response *response)
655{
656 NSS_STATUS status = NSS_STATUS_UNAVAIL;
657 int count = 0;
658
659 while ((status == NSS_STATUS_UNAVAIL) && (count < 10)) {
660 status = winbindd_send_request(req_type, 1, request);
661 if (status != NSS_STATUS_SUCCESS)
662 return(status);
663 status = winbindd_get_response(response);
664 count += 1;
665 }
666
667 return status;
668}
669
670/*************************************************************************
671 A couple of simple functions to disable winbindd lookups and re-
672 enable them
673 ************************************************************************/
674
675/* Use putenv() instead of setenv() in these functions as not all
676 environments have the latter. */
677
678BOOL winbind_off( void )
679{
680 static char *s = CONST_DISCARD(char *, WINBINDD_DONT_ENV "=1");
681
682 return putenv(s) != -1;
683}
684
685BOOL winbind_on( void )
686{
687 static char *s = CONST_DISCARD(char *, WINBINDD_DONT_ENV "=0");
688
689 return putenv(s) != -1;
690}
691
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