2 Unix SMB/CIFS implementation.
4 winbind client common code
6 Copyright (C) Tim Potter 2000
7 Copyright (C) Andrew Tridgell 2000
8 Copyright (C) Andrew Bartlett 2002
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.
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.
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/>.
26 #include "system/select.h"
27 #include "winbind_client.h"
29 /* Global variables. These are effectively the client state information */
31 int winbindd_fd
= -1; /* fd for winbindd socket */
32 static int is_privileged
= 0;
34 /* Free a response structure */
36 void winbindd_free_response(struct winbindd_response
*response
)
38 /* Free any allocated extra_data */
41 SAFE_FREE(response
->extra_data
.data
);
44 /* Initialise a request structure */
46 static void winbindd_init_request(struct winbindd_request
*request
,
49 request
->length
= sizeof(struct winbindd_request
);
51 request
->cmd
= (enum winbindd_cmd
)request_type
;
52 request
->pid
= getpid();
56 /* Initialise a response structure */
58 static void init_response(struct winbindd_response
*response
)
60 /* Initialise return value */
62 response
->result
= WINBINDD_ERROR
;
65 /* Close established socket */
67 #if HAVE_FUNCTION_ATTRIBUTE_DESTRUCTOR
68 __attribute__((destructor
))
70 static void winbind_close_sock(void)
72 if (winbindd_fd
!= -1) {
78 #define CONNECT_TIMEOUT 30
80 /* Make sure socket handle isn't stdin, stdout or stderr */
81 #define RECURSION_LIMIT 3
83 static int make_nonstd_fd_internals(int fd
, int limit
/* Recursion limiter */)
86 if (fd
>= 0 && fd
<= 2) {
88 if ((new_fd
= fcntl(fd
, F_DUPFD
, 3)) == -1) {
106 /* use the program stack to hold our list of FDs to close */
107 new_fd
= make_nonstd_fd_internals(new_fd
, limit
- 1);
115 /****************************************************************************
116 Set a fd into blocking/nonblocking mode. Uses POSIX O_NONBLOCK if available,
120 Set close on exec also.
121 ****************************************************************************/
123 static int make_safe_fd(int fd
)
126 int new_fd
= make_nonstd_fd_internals(fd
, RECURSION_LIMIT
);
132 /* Socket should be nonblocking. */
134 #define FLAG_TO_SET O_NONBLOCK
137 #define FLAG_TO_SET O_NDELAY
139 #define FLAG_TO_SET FNDELAY
143 if ((flags
= fcntl(new_fd
, F_GETFL
)) == -1) {
148 flags
|= FLAG_TO_SET
;
149 if (fcntl(new_fd
, F_SETFL
, flags
) == -1) {
156 /* Socket should be closed on exec() */
158 result
= flags
= fcntl(new_fd
, F_GETFD
, 0);
161 result
= fcntl( new_fd
, F_SETFD
, flags
);
174 * @brief Check if we have priviliged access.
176 * This checks if we have uid_wrapper running and if yes turns it of so that we
177 * can check if we have access.
179 * @param[in] uid The uid to compare if we have access.
181 * @return If we have access it returns true, else false.
183 static bool winbind_privileged_access(uid_t uid
)
187 if (uid_wrapper_enabled()) {
188 setenv("UID_WRAPPER_MYUID", "1", 1);
193 if (uid_wrapper_enabled()) {
194 unsetenv("UID_WRAPPER_MYUID");
197 return (uid
== euid
);
200 /* Connect to winbindd socket */
202 static int winbind_named_pipe_sock(const char *dir
)
204 struct sockaddr_un sunaddr
;
211 /* Check permissions on unix socket directory */
213 if (lstat(dir
, &st
) == -1) {
218 /* This tells uid_wrapper to return the userid for the geteuid check */
219 if (!S_ISDIR(st
.st_mode
) ||
220 !winbind_privileged_access(st
.st_uid
)) {
225 /* Connect to socket */
227 if (asprintf(&path
, "%s/%s", dir
, WINBINDD_SOCKET_NAME
) < 0) {
231 ZERO_STRUCT(sunaddr
);
232 sunaddr
.sun_family
= AF_UNIX
;
233 strncpy(sunaddr
.sun_path
, path
, sizeof(sunaddr
.sun_path
) - 1);
235 /* If socket file doesn't exist, don't bother trying to connect
236 with retry. This is an attempt to make the system usable when
237 the winbindd daemon is not running. */
239 if (lstat(path
, &st
) == -1) {
246 /* Check permissions on unix socket file */
248 /* This tells uid_wrapper to return the userid for the geteuid check */
249 if (!S_ISSOCK(st
.st_mode
) ||
250 !winbind_privileged_access(st
.st_uid
)) {
255 /* Connect to socket */
257 if ((fd
= socket(AF_UNIX
, SOCK_STREAM
, 0)) == -1) {
261 /* Set socket non-blocking and close on exec. */
263 if ((fd
= make_safe_fd( fd
)) == -1) {
267 for (wait_time
= 0; connect(fd
, (struct sockaddr
*)&sunaddr
, sizeof(sunaddr
)) == -1;
268 wait_time
+= slept
) {
271 int connect_errno
= 0;
274 if (wait_time
>= CONNECT_TIMEOUT
)
280 pfd
.events
= POLLOUT
;
282 ret
= poll(&pfd
, 1, (CONNECT_TIMEOUT
- wait_time
) * 1000);
285 errnosize
= sizeof(connect_errno
);
287 ret
= getsockopt(fd
, SOL_SOCKET
,
288 SO_ERROR
, &connect_errno
, &errnosize
);
290 if (ret
>= 0 && connect_errno
== 0) {
291 /* Connect succeed */
296 slept
= CONNECT_TIMEOUT
;
299 slept
= rand() % 3 + 1;
318 static const char *winbindd_socket_dir(void)
320 if (nss_wrapper_enabled()) {
323 env_dir
= getenv("SELFTEST_WINBINDD_SOCKET_DIR");
324 if (env_dir
!= NULL
) {
329 return WINBINDD_SOCKET_DIR
;
332 /* Connect to winbindd socket */
334 static int winbind_open_pipe_sock(int recursing
, int need_priv
)
336 #ifdef HAVE_UNIXSOCKET
337 static pid_t our_pid
;
338 struct winbindd_request request
;
339 struct winbindd_response response
;
340 ZERO_STRUCT(request
);
341 ZERO_STRUCT(response
);
343 if (our_pid
!= getpid()) {
344 winbind_close_sock();
348 if ((need_priv
!= 0) && (is_privileged
== 0)) {
349 winbind_close_sock();
352 if (winbindd_fd
!= -1) {
360 if ((winbindd_fd
= winbind_named_pipe_sock(winbindd_socket_dir())) == -1) {
366 /* version-check the socket */
368 request
.wb_flags
= WBFLAG_RECURSE
;
369 if ((winbindd_request_response(WINBINDD_INTERFACE_VERSION
, &request
, &response
) != NSS_STATUS_SUCCESS
) || (response
.data
.interface_version
!= WINBIND_INTERFACE_VERSION
)) {
370 winbind_close_sock();
374 /* try and get priv pipe */
376 request
.wb_flags
= WBFLAG_RECURSE
;
378 /* Note that response needs to be initialized to avoid
379 * crashing on clean up after WINBINDD_PRIV_PIPE_DIR call failed
380 * as interface version (from the first request) returned as a fstring,
381 * thus response.extra_data.data will not be NULL even though
382 * winbindd response did not write over it due to a failure */
383 ZERO_STRUCT(response
);
384 if (winbindd_request_response(WINBINDD_PRIV_PIPE_DIR
, &request
, &response
) == NSS_STATUS_SUCCESS
) {
386 if ((fd
= winbind_named_pipe_sock((char *)response
.extra_data
.data
)) != -1) {
393 if ((need_priv
!= 0) && (is_privileged
== 0)) {
397 SAFE_FREE(response
.extra_data
.data
);
402 #endif /* HAVE_UNIXSOCKET */
405 /* Write data to winbindd socket */
407 static int winbind_write_sock(void *buffer
, int count
, int recursing
,
410 int fd
, result
, nwritten
;
412 /* Open connection to winbind daemon */
416 fd
= winbind_open_pipe_sock(recursing
, need_priv
);
422 /* Write data to socket */
426 while(nwritten
< count
) {
430 /* Catch pipe close on other end by checking if a read()
431 call would not block by calling poll(). */
434 pfd
.events
= POLLIN
|POLLOUT
|POLLHUP
;
436 ret
= poll(&pfd
, 1, -1);
438 winbind_close_sock();
439 return -1; /* poll error */
442 /* Write should be OK if fd not available for reading */
444 if ((ret
== 1) && (pfd
.revents
& (POLLIN
|POLLHUP
|POLLERR
))) {
446 /* Pipe has closed on remote end */
448 winbind_close_sock();
454 result
= write(fd
, (char *)buffer
+ nwritten
,
457 if ((result
== -1) || (result
== 0)) {
461 winbind_close_sock();
471 /* Read data from winbindd socket */
473 static int winbind_read_sock(void *buffer
, int count
)
479 fd
= winbind_open_pipe_sock(false, false);
484 /* Read data from socket */
485 while(nread
< count
) {
489 /* Catch pipe close on other end by checking if a read()
490 call would not block by calling poll(). */
493 pfd
.events
= POLLIN
|POLLHUP
;
495 /* Wait for 5 seconds for a reply. May need to parameterise this... */
497 ret
= poll(&pfd
, 1, 5000);
499 winbind_close_sock();
500 return -1; /* poll error */
504 /* Not ready for read yet... */
505 if (total_time
>= 30) {
507 winbind_close_sock();
514 if ((ret
== 1) && (pfd
.revents
& (POLLIN
|POLLHUP
|POLLERR
))) {
518 int result
= read(fd
, (char *)buffer
+ nread
,
521 if ((result
== -1) || (result
== 0)) {
523 /* Read failed. I think the only useful thing we
524 can do here is just return -1 and fail since the
525 transaction has failed half way through. */
527 winbind_close_sock();
541 static int winbindd_read_reply(struct winbindd_response
*response
)
543 int result1
, result2
= 0;
549 /* Read fixed length response */
551 result1
= winbind_read_sock(response
,
552 sizeof(struct winbindd_response
));
557 if (response
->length
< sizeof(struct winbindd_response
)) {
561 /* We actually send the pointer value of the extra_data field from
562 the server. This has no meaning in the client's address space
563 so we clear it out. */
565 response
->extra_data
.data
= NULL
;
567 /* Read variable length response */
569 if (response
->length
> sizeof(struct winbindd_response
)) {
570 int extra_data_len
= response
->length
-
571 sizeof(struct winbindd_response
);
573 /* Mallocate memory for extra data */
575 if (!(response
->extra_data
.data
= malloc(extra_data_len
))) {
579 result2
= winbind_read_sock(response
->extra_data
.data
,
582 winbindd_free_response(response
);
587 /* Return total amount of data read */
589 return result1
+ result2
;
593 * send simple types of requests
596 NSS_STATUS
winbindd_send_request(int req_type
, int need_priv
,
597 struct winbindd_request
*request
)
599 struct winbindd_request lrequest
;
601 /* Check for our tricky environment variable */
603 if (winbind_env_set()) {
604 return NSS_STATUS_NOTFOUND
;
608 ZERO_STRUCT(lrequest
);
612 /* Fill in request and send down pipe */
614 winbindd_init_request(request
, req_type
);
616 if (winbind_write_sock(request
, sizeof(*request
),
617 request
->wb_flags
& WBFLAG_RECURSE
,
620 /* Set ENOENT for consistency. Required by some apps */
623 return NSS_STATUS_UNAVAIL
;
626 if ((request
->extra_len
!= 0) &&
627 (winbind_write_sock(request
->extra_data
.data
,
629 request
->wb_flags
& WBFLAG_RECURSE
,
632 /* Set ENOENT for consistency. Required by some apps */
635 return NSS_STATUS_UNAVAIL
;
638 return NSS_STATUS_SUCCESS
;
642 * Get results from winbindd request
645 NSS_STATUS
winbindd_get_response(struct winbindd_response
*response
)
647 struct winbindd_response lresponse
;
650 ZERO_STRUCT(lresponse
);
651 response
= &lresponse
;
654 init_response(response
);
657 if (winbindd_read_reply(response
) == -1) {
658 /* Set ENOENT for consistency. Required by some apps */
661 return NSS_STATUS_UNAVAIL
;
664 /* Throw away extra data if client didn't request it */
665 if (response
== &lresponse
) {
666 winbindd_free_response(response
);
669 /* Copy reply data from socket */
670 if (response
->result
!= WINBINDD_OK
) {
671 return NSS_STATUS_NOTFOUND
;
674 return NSS_STATUS_SUCCESS
;
677 /* Handle simple types of requests */
679 NSS_STATUS
winbindd_request_response(int req_type
,
680 struct winbindd_request
*request
,
681 struct winbindd_response
*response
)
683 NSS_STATUS status
= NSS_STATUS_UNAVAIL
;
686 while ((status
== NSS_STATUS_UNAVAIL
) && (count
< 10)) {
687 status
= winbindd_send_request(req_type
, 0, request
);
688 if (status
!= NSS_STATUS_SUCCESS
)
690 status
= winbindd_get_response(response
);
697 NSS_STATUS
winbindd_priv_request_response(int req_type
,
698 struct winbindd_request
*request
,
699 struct winbindd_response
*response
)
701 NSS_STATUS status
= NSS_STATUS_UNAVAIL
;
704 while ((status
== NSS_STATUS_UNAVAIL
) && (count
< 10)) {
705 status
= winbindd_send_request(req_type
, 1, request
);
706 if (status
!= NSS_STATUS_SUCCESS
)
708 status
= winbindd_get_response(response
);