Line data Source code
1 : /*
2 : Unix SMB/CIFS implementation.
3 : Samba system utilities
4 : Copyright (C) Andrew Tridgell 1992-1998
5 : Copyright (C) Jeremy Allison 1998-2005
6 : Copyright (C) Timur Bakeyev 2005
7 : Copyright (C) Bjoern Jacke 2006-2007
8 :
9 : This program is free software; you can redistribute it and/or modify
10 : it under the terms of the GNU General Public License as published by
11 : the Free Software Foundation; either version 3 of the License, or
12 : (at your option) any later version.
13 :
14 : This program is distributed in the hope that it will be useful,
15 : but WITHOUT ANY WARRANTY; without even the implied warranty of
16 : MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 : GNU General Public License for more details.
18 :
19 : You should have received a copy of the GNU General Public License
20 : along with this program. If not, see <http://www.gnu.org/licenses/>.
21 : */
22 :
23 : #include "includes.h"
24 : #include "system/syslog.h"
25 : #include "system/capability.h"
26 : #include "system/passwd.h"
27 : #include "system/filesys.h"
28 : #include "lib/util/setid.h"
29 : #include "lib/util/time.h"
30 :
31 : #ifdef HAVE_SYS_SYSCTL_H
32 : #include <sys/sysctl.h>
33 : #endif
34 :
35 : #ifdef HAVE_SYS_PRCTL_H
36 : #include <sys/prctl.h>
37 : #endif
38 :
39 : /*
40 : The idea is that this file will eventually have wrappers around all
41 : important system calls in samba. The aims are:
42 :
43 : - to enable easier porting by putting OS dependent stuff in here
44 :
45 : - to allow for hooks into other "pseudo-filesystems"
46 :
47 : - to allow easier integration of things like the japanese extensions
48 :
49 : - to support the philosophy of Samba to expose the features of
50 : the OS within the SMB model. In general whatever file/printer/variable
51 : expansions/etc make sense to the OS should be acceptable to Samba.
52 : */
53 :
54 : /*******************************************************************
55 : A send wrapper that will deal with EINTR or EAGAIN or EWOULDBLOCK.
56 : ********************************************************************/
57 :
58 0 : ssize_t sys_send(int s, const void *msg, size_t len, int flags)
59 : {
60 0 : ssize_t ret;
61 :
62 0 : do {
63 0 : ret = send(s, msg, len, flags);
64 0 : } while (ret == -1 && (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK));
65 :
66 0 : return ret;
67 : }
68 :
69 : /*******************************************************************
70 : A recvfrom wrapper that will deal with EINTR.
71 : NB. As used with non-blocking sockets, return on EAGAIN/EWOULDBLOCK
72 : ********************************************************************/
73 :
74 9465 : ssize_t sys_recvfrom(int s, void *buf, size_t len, int flags, struct sockaddr *from, socklen_t *fromlen)
75 : {
76 0 : ssize_t ret;
77 :
78 0 : do {
79 9465 : ret = recvfrom(s, buf, len, flags, from, fromlen);
80 9465 : } while (ret == -1 && (errno == EINTR));
81 9465 : return ret;
82 : }
83 :
84 : /*******************************************************************
85 : A fcntl wrapper that will deal with EINTR.
86 : ********************************************************************/
87 :
88 205625 : int sys_fcntl_ptr(int fd, int cmd, void *arg)
89 : {
90 113 : int ret;
91 :
92 113 : do {
93 205625 : ret = fcntl(fd, cmd, arg);
94 205625 : } while (ret == -1 && errno == EINTR);
95 205625 : return ret;
96 : }
97 :
98 : /*******************************************************************
99 : A fcntl wrapper that will deal with EINTR.
100 : ********************************************************************/
101 :
102 0 : int sys_fcntl_long(int fd, int cmd, long arg)
103 : {
104 0 : int ret;
105 :
106 0 : do {
107 0 : ret = fcntl(fd, cmd, arg);
108 0 : } while (ret == -1 && errno == EINTR);
109 0 : return ret;
110 : }
111 :
112 : /*******************************************************************
113 : A fcntl wrapper that will deal with EINTR.
114 : ********************************************************************/
115 :
116 381264 : int sys_fcntl_int(int fd, int cmd, int arg)
117 : {
118 898 : int ret;
119 :
120 898 : do {
121 381264 : ret = fcntl(fd, cmd, arg);
122 381264 : } while (ret == -1 && errno == EINTR);
123 381264 : return ret;
124 : }
125 :
126 : /****************************************************************************
127 : Return the best approximation to a 'create time' under UNIX from a stat
128 : structure.
129 : ****************************************************************************/
130 :
131 39426439 : static struct timespec calc_create_time_stat(const struct stat *st)
132 : {
133 135549 : struct timespec ret, ret1;
134 39426439 : struct timespec c_time = get_ctimespec(st);
135 39426439 : struct timespec m_time = get_mtimespec(st);
136 39426439 : struct timespec a_time = get_atimespec(st);
137 :
138 39426439 : ret = timespec_compare(&c_time, &m_time) < 0 ? c_time : m_time;
139 39426439 : ret1 = timespec_compare(&ret, &a_time) < 0 ? ret : a_time;
140 :
141 39426439 : if(!null_timespec(ret1)) {
142 39424599 : return ret1;
143 : }
144 :
145 : /*
146 : * One of ctime, mtime or atime was zero (probably atime).
147 : * Just return MIN(ctime, mtime).
148 : */
149 1840 : return ret;
150 : }
151 :
152 : /****************************************************************************
153 : Return the best approximation to a 'create time' under UNIX from a stat_ex
154 : structure.
155 : ****************************************************************************/
156 :
157 16802 : static struct timespec calc_create_time_stat_ex(const struct stat_ex *st)
158 : {
159 5 : struct timespec ret, ret1;
160 16802 : struct timespec c_time = st->st_ex_ctime;
161 16802 : struct timespec m_time = st->st_ex_mtime;
162 16802 : struct timespec a_time = st->st_ex_atime;
163 :
164 16802 : ret = timespec_compare(&c_time, &m_time) < 0 ? c_time : m_time;
165 16802 : ret1 = timespec_compare(&ret, &a_time) < 0 ? ret : a_time;
166 :
167 16802 : if(!null_timespec(ret1)) {
168 16746 : return ret1;
169 : }
170 :
171 : /*
172 : * One of ctime, mtime or atime was zero (probably atime).
173 : * Just return MIN(ctime, mtime).
174 : */
175 56 : return ret;
176 : }
177 :
178 : /****************************************************************************
179 : Return the 'create time' from a stat struct if it exists (birthtime) or else
180 : use the best approximation.
181 : ****************************************************************************/
182 :
183 39425519 : static void make_create_timespec(const struct stat *pst, struct stat_ex *dst,
184 : bool fake_dir_create_times)
185 : {
186 39425519 : if (S_ISDIR(pst->st_mode) && fake_dir_create_times) {
187 0 : dst->st_ex_btime.tv_sec = 315493200L; /* 1/1/1980 */
188 0 : dst->st_ex_btime.tv_nsec = 0;
189 : }
190 :
191 39425519 : dst->st_ex_iflags &= ~ST_EX_IFLAG_CALCULATED_BTIME;
192 :
193 : #if defined(HAVE_STRUCT_STAT_ST_BIRTHTIMESPEC_TV_NSEC)
194 : dst->st_ex_btime = pst->st_birthtimespec;
195 : #elif defined(HAVE_STRUCT_STAT_ST_BIRTHTIMENSEC)
196 : dst->st_ex_btime.tv_sec = pst->st_birthtime;
197 : dst->st_ex_btime.tv_nsec = pst->st_birthtimenspec;
198 : #elif defined(HAVE_STRUCT_STAT_ST_BIRTHTIME)
199 : dst->st_ex_btime.tv_sec = pst->st_birthtime;
200 : dst->st_ex_btime.tv_nsec = 0;
201 : #else
202 39425519 : dst->st_ex_btime = calc_create_time_stat(pst);
203 39425519 : dst->st_ex_iflags |= ST_EX_IFLAG_CALCULATED_BTIME;
204 : #endif
205 :
206 : /* Deal with systems that don't initialize birthtime correctly.
207 : * Pointed out by SATOH Fumiyasu <fumiyas@osstech.jp>.
208 : */
209 39425519 : if (null_timespec(dst->st_ex_btime)) {
210 920 : dst->st_ex_btime = calc_create_time_stat(pst);
211 920 : dst->st_ex_iflags |= ST_EX_IFLAG_CALCULATED_BTIME;
212 : }
213 39425519 : }
214 :
215 : /****************************************************************************
216 : If we update a timestamp in a stat_ex struct we may have to recalculate
217 : the birthtime. For now only implement this for write time, but we may
218 : also need to do it for atime and ctime. JRA.
219 : ****************************************************************************/
220 :
221 373234 : void update_stat_ex_mtime(struct stat_ex *dst,
222 : struct timespec write_ts)
223 : {
224 373234 : dst->st_ex_mtime = write_ts;
225 :
226 : /* We may have to recalculate btime. */
227 373234 : if (dst->st_ex_iflags & ST_EX_IFLAG_CALCULATED_BTIME) {
228 16802 : dst->st_ex_btime = calc_create_time_stat_ex(dst);
229 : }
230 373234 : }
231 :
232 2499280 : void update_stat_ex_create_time(struct stat_ex *dst,
233 : struct timespec create_time)
234 : {
235 2499280 : dst->st_ex_btime = create_time;
236 2499280 : dst->st_ex_iflags &= ~ST_EX_IFLAG_CALCULATED_BTIME;
237 2499280 : }
238 :
239 3455021 : void update_stat_ex_from_saved_stat(struct stat_ex *dst,
240 : const struct stat_ex *src)
241 : {
242 3455021 : if (!VALID_STAT(*src)) {
243 509147 : return;
244 : }
245 :
246 2936854 : if (!(src->st_ex_iflags & ST_EX_IFLAG_CALCULATED_BTIME)) {
247 979501 : update_stat_ex_create_time(dst, src->st_ex_btime);
248 : }
249 : }
250 :
251 39425519 : void init_stat_ex_from_stat (struct stat_ex *dst,
252 : const struct stat *src,
253 : bool fake_dir_create_times)
254 : {
255 39425519 : dst->st_ex_dev = src->st_dev;
256 39425519 : dst->st_ex_ino = src->st_ino;
257 39425519 : dst->st_ex_mode = src->st_mode;
258 39425519 : dst->st_ex_nlink = src->st_nlink;
259 39425519 : dst->st_ex_uid = src->st_uid;
260 39425519 : dst->st_ex_gid = src->st_gid;
261 39425519 : dst->st_ex_rdev = src->st_rdev;
262 39425519 : dst->st_ex_size = src->st_size;
263 39425519 : dst->st_ex_atime = get_atimespec(src);
264 39425519 : dst->st_ex_mtime = get_mtimespec(src);
265 39425519 : dst->st_ex_ctime = get_ctimespec(src);
266 39425519 : dst->st_ex_iflags = 0;
267 39425519 : make_create_timespec(src, dst, fake_dir_create_times);
268 : #ifdef HAVE_STAT_ST_BLKSIZE
269 39425519 : dst->st_ex_blksize = src->st_blksize;
270 : #else
271 : dst->st_ex_blksize = STAT_ST_BLOCKSIZE;
272 : #endif
273 :
274 : #ifdef HAVE_STAT_ST_BLOCKS
275 39425519 : dst->st_ex_blocks = src->st_blocks;
276 : #else
277 : dst->st_ex_blocks = src->st_size / dst->st_ex_blksize + 1;
278 : #endif
279 :
280 : #ifdef HAVE_STAT_ST_FLAGS
281 : dst->st_ex_flags = src->st_flags;
282 : #else
283 39425519 : dst->st_ex_flags = 0;
284 : #endif
285 39425519 : }
286 :
287 : /*******************************************************************
288 : A stat() wrapper.
289 : ********************************************************************/
290 :
291 5678320 : int sys_stat(const char *fname, SMB_STRUCT_STAT *sbuf,
292 : bool fake_dir_create_times)
293 : {
294 11179 : int ret;
295 11179 : struct stat statbuf;
296 5678320 : ret = stat(fname, &statbuf);
297 5678320 : if (ret == 0) {
298 : /* we always want directories to appear zero size */
299 5207794 : if (S_ISDIR(statbuf.st_mode)) {
300 4877057 : statbuf.st_size = 0;
301 : }
302 5207794 : init_stat_ex_from_stat(sbuf, &statbuf, fake_dir_create_times);
303 : }
304 5678320 : return ret;
305 : }
306 :
307 : /*******************************************************************
308 : An fstat() wrapper.
309 : ********************************************************************/
310 :
311 34120413 : int sys_fstat(int fd, SMB_STRUCT_STAT *sbuf, bool fake_dir_create_times)
312 : {
313 125539 : int ret;
314 125539 : struct stat statbuf;
315 34120413 : ret = fstat(fd, &statbuf);
316 34120413 : if (ret == 0) {
317 : /* we always want directories to appear zero size */
318 34120205 : if (S_ISDIR(statbuf.st_mode)) {
319 20453734 : statbuf.st_size = 0;
320 : }
321 34120205 : init_stat_ex_from_stat(sbuf, &statbuf, fake_dir_create_times);
322 : }
323 34120413 : return ret;
324 : }
325 :
326 : /*******************************************************************
327 : An lstat() wrapper.
328 : ********************************************************************/
329 :
330 68900 : int sys_lstat(const char *fname,SMB_STRUCT_STAT *sbuf,
331 : bool fake_dir_create_times)
332 : {
333 70 : int ret;
334 70 : struct stat statbuf;
335 68900 : ret = lstat(fname, &statbuf);
336 68900 : if (ret == 0) {
337 : /* we always want directories to appear zero size */
338 48331 : if (S_ISDIR(statbuf.st_mode)) {
339 23888 : statbuf.st_size = 0;
340 : }
341 48331 : init_stat_ex_from_stat(sbuf, &statbuf, fake_dir_create_times);
342 : }
343 68900 : return ret;
344 : }
345 :
346 : /*******************************************************************
347 : An fstatat() wrapper.
348 : ********************************************************************/
349 :
350 49564 : int sys_fstatat(int fd,
351 : const char *pathname,
352 : SMB_STRUCT_STAT *sbuf,
353 : int flags,
354 : bool fake_dir_create_times)
355 : {
356 156 : int ret;
357 156 : struct stat statbuf;
358 :
359 49564 : ret = fstatat(fd, pathname, &statbuf, flags);
360 49564 : if (ret != 0) {
361 375 : return -1;
362 : }
363 :
364 : /* we always want directories to appear zero size */
365 49189 : if (S_ISDIR(statbuf.st_mode)) {
366 12416 : statbuf.st_size = 0;
367 : }
368 49189 : init_stat_ex_from_stat(sbuf, &statbuf, fake_dir_create_times);
369 49189 : return 0;
370 : }
371 :
372 : /*******************************************************************
373 : An posix_fallocate() wrapper.
374 : ********************************************************************/
375 0 : int sys_posix_fallocate(int fd, off_t offset, off_t len)
376 : {
377 : #if defined(HAVE_POSIX_FALLOCATE)
378 0 : return posix_fallocate(fd, offset, len);
379 : #elif defined(F_RESVSP64)
380 : /* this handles XFS on IRIX */
381 : struct flock64 fl;
382 : off_t new_len = offset + len;
383 : int ret;
384 : struct stat64 sbuf;
385 :
386 : /* unlikely to get a too large file on a 64bit system but ... */
387 : if (new_len < 0)
388 : return EFBIG;
389 :
390 : fl.l_whence = SEEK_SET;
391 : fl.l_start = offset;
392 : fl.l_len = len;
393 :
394 : ret=fcntl(fd, F_RESVSP64, &fl);
395 :
396 : if (ret != 0)
397 : return errno;
398 :
399 : /* Make sure the file gets enlarged after we allocated space: */
400 : fstat64(fd, &sbuf);
401 : if (new_len > sbuf.st_size)
402 : ftruncate64(fd, new_len);
403 : return 0;
404 : #else
405 : return ENOSYS;
406 : #endif
407 : }
408 :
409 : /*******************************************************************
410 : An fallocate() function that matches the semantics of the Linux one.
411 : ********************************************************************/
412 :
413 : #ifdef HAVE_LINUX_FALLOC_H
414 : #include <linux/falloc.h>
415 : #endif
416 :
417 186 : int sys_fallocate(int fd, uint32_t mode, off_t offset, off_t len)
418 : {
419 : #if defined(HAVE_LINUX_FALLOCATE)
420 186 : int lmode = 0;
421 :
422 186 : if (mode & VFS_FALLOCATE_FL_KEEP_SIZE) {
423 186 : lmode |= FALLOC_FL_KEEP_SIZE;
424 186 : mode &= ~VFS_FALLOCATE_FL_KEEP_SIZE;
425 : }
426 :
427 : #if defined(HAVE_FALLOC_FL_PUNCH_HOLE)
428 186 : if (mode & VFS_FALLOCATE_FL_PUNCH_HOLE) {
429 186 : lmode |= FALLOC_FL_PUNCH_HOLE;
430 186 : mode &= ~VFS_FALLOCATE_FL_PUNCH_HOLE;
431 : }
432 : #endif /* HAVE_FALLOC_FL_PUNCH_HOLE */
433 :
434 186 : if (mode != 0) {
435 0 : DEBUG(2, ("unmapped fallocate flags: %lx\n",
436 : (unsigned long)mode));
437 0 : errno = EINVAL;
438 0 : return -1;
439 : }
440 186 : return fallocate(fd, lmode, offset, len);
441 : #else /* HAVE_LINUX_FALLOCATE */
442 : /* TODO - plumb in fallocate from other filesysetms like VXFS etc. JRA. */
443 : errno = ENOSYS;
444 : return -1;
445 : #endif /* HAVE_LINUX_FALLOCATE */
446 : }
447 :
448 : /*******************************************************************
449 : An fdopendir wrapper.
450 : ********************************************************************/
451 :
452 306953 : DIR *sys_fdopendir(int fd)
453 : {
454 : #if defined(HAVE_FDOPENDIR)
455 306953 : return fdopendir(fd);
456 : #else
457 : errno = ENOSYS;
458 : return NULL;
459 : #endif
460 : }
461 :
462 : /*******************************************************************
463 : An mknod() wrapper.
464 : ********************************************************************/
465 :
466 0 : int sys_mknod(const char *path, mode_t mode, SMB_DEV_T dev)
467 : {
468 : #if defined(HAVE_MKNOD)
469 0 : return mknod(path, mode, dev);
470 : #else
471 : /* No mknod system call. */
472 : errno = ENOSYS;
473 : return -1;
474 : #endif
475 : }
476 :
477 : /*******************************************************************
478 : A mknodat() wrapper.
479 : ********************************************************************/
480 :
481 2 : int sys_mknodat(int dirfd, const char *path, mode_t mode, SMB_DEV_T dev)
482 : {
483 : #if defined(HAVE_MKNODAT)
484 2 : return mknodat(dirfd, path, mode, dev);
485 : #else
486 : /* No mknod system call. */
487 : errno = ENOSYS;
488 : return -1;
489 : #endif
490 : }
491 :
492 : /*******************************************************************
493 : System wrapper for getwd. Always returns MALLOC'ed memory, or NULL
494 : on error (malloc fail usually).
495 : ********************************************************************/
496 :
497 102336 : char *sys_getwd(void)
498 : {
499 : #ifdef GETCWD_TAKES_NULL
500 102336 : return getcwd(NULL, 0);
501 : #elif defined(HAVE_GETCWD)
502 : char *wd = NULL, *s = NULL;
503 : size_t allocated = PATH_MAX;
504 :
505 : while (1) {
506 : s = SMB_REALLOC_ARRAY(s, char, allocated);
507 : if (s == NULL) {
508 : return NULL;
509 : }
510 : wd = getcwd(s, allocated);
511 : if (wd) {
512 : break;
513 : }
514 : if (errno != ERANGE) {
515 : int saved_errno = errno;
516 : SAFE_FREE(s);
517 : errno = saved_errno;
518 : break;
519 : }
520 : allocated *= 2;
521 : if (allocated < PATH_MAX) {
522 : SAFE_FREE(s);
523 : break;
524 : }
525 : }
526 : return wd;
527 : #else
528 : char *wd = NULL;
529 : char *s = SMB_MALLOC_ARRAY(char, PATH_MAX);
530 : if (s == NULL) {
531 : return NULL;
532 : }
533 : wd = getwd(s);
534 : if (wd == NULL) {
535 : int saved_errno = errno;
536 : SAFE_FREE(s);
537 : errno = saved_errno;
538 : }
539 : return wd;
540 : #endif
541 : }
542 :
543 : #if defined(HAVE_POSIX_CAPABILITIES)
544 :
545 : /**************************************************************************
546 : Try and abstract process capabilities (for systems that have them).
547 : ****************************************************************************/
548 :
549 : /* Set the POSIX capabilities needed for the given purpose into the effective
550 : * capability set of the current process. Make sure they are always removed
551 : * from the inheritable set, because there is no circumstance in which our
552 : * children should inherit our elevated privileges.
553 : */
554 7183 : static bool set_process_capability(enum smbd_capability capability,
555 : bool enable)
556 : {
557 : /* "5" is the number of "num_cap_vals++" below */
558 7183 : cap_value_t cap_vals[5] = {0};
559 7183 : size_t num_cap_vals = 0;
560 :
561 5 : cap_t cap;
562 :
563 : #if defined(HAVE_PRCTL) && defined(PR_GET_KEEPCAPS) && defined(PR_SET_KEEPCAPS)
564 : /* On Linux, make sure that any capabilities we grab are sticky
565 : * across UID changes. We expect that this would allow us to keep both
566 : * the effective and permitted capability sets, but as of circa 2.6.16,
567 : * only the permitted set is kept. It is a bug (which we work around)
568 : * that the effective set is lost, but we still require the effective
569 : * set to be kept.
570 : */
571 7183 : if (!prctl(PR_GET_KEEPCAPS)) {
572 907 : prctl(PR_SET_KEEPCAPS, 1);
573 : }
574 : #endif
575 :
576 7183 : cap = cap_get_proc();
577 7183 : if (cap == NULL) {
578 0 : DEBUG(0,("set_process_capability: cap_get_proc failed: %s\n",
579 : strerror(errno)));
580 0 : return False;
581 : }
582 :
583 7183 : switch (capability) {
584 : /*
585 : * WARNING: If you add any #ifdef for a fresh
586 : * capability, bump up the array size in the
587 : * declaration of cap_vals[] above just to be
588 : * trivially safe to never overwrite cap_vals[].
589 : */
590 3147 : case KERNEL_OPLOCK_CAPABILITY:
591 : #ifdef CAP_NETWORK_MGT
592 : /* IRIX has CAP_NETWORK_MGT for oplocks. */
593 : cap_vals[num_cap_vals++] = CAP_NETWORK_MGT;
594 : #endif
595 3147 : break;
596 3147 : case DMAPI_ACCESS_CAPABILITY:
597 : #ifdef CAP_DEVICE_MGT
598 : /* IRIX has CAP_DEVICE_MGT for DMAPI access. */
599 : cap_vals[num_cap_vals++] = CAP_DEVICE_MGT;
600 : #elif CAP_MKNOD
601 : /* Linux has CAP_MKNOD for DMAPI access. */
602 3147 : cap_vals[num_cap_vals++] = CAP_MKNOD;
603 : #endif
604 3147 : break;
605 0 : case LEASE_CAPABILITY:
606 : #ifdef CAP_LEASE
607 0 : cap_vals[num_cap_vals++] = CAP_LEASE;
608 : #endif
609 0 : break;
610 889 : case DAC_OVERRIDE_CAPABILITY:
611 : #ifdef CAP_DAC_OVERRIDE
612 889 : cap_vals[num_cap_vals++] = CAP_DAC_OVERRIDE;
613 : #endif
614 : }
615 :
616 7183 : if (num_cap_vals == 0) {
617 3147 : cap_free(cap);
618 3147 : return True;
619 : }
620 :
621 4036 : cap_set_flag(cap, CAP_EFFECTIVE, num_cap_vals, cap_vals,
622 : enable ? CAP_SET : CAP_CLEAR);
623 :
624 : /* We never want to pass capabilities down to our children, so make
625 : * sure they are not inherited.
626 : */
627 4036 : cap_set_flag(cap, CAP_INHERITABLE, num_cap_vals, cap_vals, CAP_CLEAR);
628 :
629 4036 : if (cap_set_proc(cap) == -1) {
630 889 : DBG_ERR("adding capability %d: cap_set_proc failed: %s\n",
631 : capability, strerror(errno));
632 889 : cap_free(cap);
633 889 : return False;
634 : }
635 3147 : DBG_INFO("added capability %d\n", capability);
636 :
637 3147 : cap_free(cap);
638 3147 : return True;
639 : }
640 :
641 : #endif /* HAVE_POSIX_CAPABILITIES */
642 :
643 : /****************************************************************************
644 : Gain the oplock capability from the kernel if possible.
645 : ****************************************************************************/
646 :
647 : #if defined(HAVE_POSIX_CAPABILITIES) && defined(CAP_DAC_OVERRIDE)
648 : static bool have_cap_dac_override = true;
649 : #else
650 : static bool have_cap_dac_override = false;
651 : #endif
652 :
653 1492935 : void set_effective_capability(enum smbd_capability capability)
654 : {
655 1492935 : bool ret = false;
656 :
657 1492935 : if (capability != DAC_OVERRIDE_CAPABILITY || have_cap_dac_override) {
658 : #if defined(HAVE_POSIX_CAPABILITIES)
659 889 : ret = set_process_capability(capability, True);
660 : #endif /* HAVE_POSIX_CAPABILITIES */
661 : }
662 :
663 : /*
664 : * Fallback to become_root() if CAP_DAC_OVERRIDE is not
665 : * available.
666 : */
667 1492935 : if (capability == DAC_OVERRIDE_CAPABILITY) {
668 1492935 : if (!ret) {
669 1492935 : have_cap_dac_override = false;
670 : }
671 1492935 : if (!have_cap_dac_override) {
672 1492935 : become_root();
673 : }
674 : }
675 1492935 : }
676 :
677 1499229 : void drop_effective_capability(enum smbd_capability capability)
678 : {
679 1499229 : if (capability != DAC_OVERRIDE_CAPABILITY || have_cap_dac_override) {
680 : #if defined(HAVE_POSIX_CAPABILITIES)
681 6294 : set_process_capability(capability, False);
682 : #endif /* HAVE_POSIX_CAPABILITIES */
683 : } else {
684 1492935 : unbecome_root();
685 : }
686 1499229 : }
687 :
688 : /**************************************************************************
689 : Wrapper for random().
690 : ****************************************************************************/
691 :
692 1800 : long sys_random(void)
693 : {
694 : #if defined(HAVE_RANDOM)
695 1800 : return (long)random();
696 : #elif defined(HAVE_RAND)
697 : return (long)rand();
698 : #else
699 : DEBUG(0,("Error - no random function available !\n"));
700 : exit(1);
701 : #endif
702 : }
703 :
704 : /**************************************************************************
705 : Wrapper for srandom().
706 : ****************************************************************************/
707 :
708 39 : void sys_srandom(unsigned int seed)
709 : {
710 : #if defined(HAVE_SRANDOM)
711 39 : srandom(seed);
712 : #elif defined(HAVE_SRAND)
713 : srand(seed);
714 : #else
715 : DEBUG(0,("Error - no srandom function available !\n"));
716 : exit(1);
717 : #endif
718 39 : }
719 :
720 : #ifndef NGROUPS_MAX
721 : #define NGROUPS_MAX 32 /* Guess... */
722 : #endif
723 :
724 : /**************************************************************************
725 : Returns equivalent to NGROUPS_MAX - using sysconf if needed.
726 : ****************************************************************************/
727 :
728 46299 : int setgroups_max(void)
729 : {
730 : #if defined(SYSCONF_SC_NGROUPS_MAX)
731 46299 : int ret = sysconf(_SC_NGROUPS_MAX);
732 46299 : return (ret == -1) ? NGROUPS_MAX : ret;
733 : #else
734 : return NGROUPS_MAX;
735 : #endif
736 : }
737 :
738 46299 : int getgroups_max(void)
739 : {
740 : #if defined(DARWINOS)
741 : /*
742 : * On MacOS sysconf(_SC_NGROUPS_MAX) returns 16 due to MacOS's group
743 : * nesting. However, The initgroups() manpage states the following:
744 : * "Note that OS X supports group membership in an unlimited number
745 : * of groups. The OS X kernel uses the group list stored in the process
746 : * credentials only as an initial cache. Additional group memberships
747 : * are determined by communication between the operating system and the
748 : * opendirectoryd daemon."
749 : */
750 : return INT_MAX;
751 : #else
752 46299 : return setgroups_max();
753 : #endif
754 : }
755 :
756 : /**************************************************************************
757 : Wrap setgroups and getgroups for systems that declare getgroups() as
758 : returning an array of gid_t, but actually return an array of int.
759 : ****************************************************************************/
760 :
761 : #if defined(HAVE_BROKEN_GETGROUPS)
762 :
763 : #ifdef HAVE_BROKEN_GETGROUPS
764 : #define GID_T int
765 : #else
766 : #define GID_T gid_t
767 : #endif
768 :
769 : static int sys_broken_getgroups(int setlen, gid_t *gidset)
770 : {
771 : GID_T *group_list;
772 : int i, ngroups;
773 :
774 : if(setlen == 0) {
775 : return getgroups(0, NULL);
776 : }
777 :
778 : /*
779 : * Broken case. We need to allocate a
780 : * GID_T array of size setlen.
781 : */
782 :
783 : if(setlen < 0) {
784 : errno = EINVAL;
785 : return -1;
786 : }
787 :
788 : if((group_list = SMB_MALLOC_ARRAY(GID_T, setlen)) == NULL) {
789 : DEBUG(0,("sys_getgroups: Malloc fail.\n"));
790 : return -1;
791 : }
792 :
793 : if((ngroups = getgroups(setlen, group_list)) < 0) {
794 : int saved_errno = errno;
795 : SAFE_FREE(group_list);
796 : errno = saved_errno;
797 : return -1;
798 : }
799 :
800 : /*
801 : * We're safe here as if ngroups > setlen then
802 : * getgroups *must* return EINVAL.
803 : * pubs.opengroup.org/onlinepubs/009695399/functions/getgroups.html
804 : */
805 :
806 : for(i = 0; i < ngroups; i++)
807 : gidset[i] = (gid_t)group_list[i];
808 :
809 : SAFE_FREE(group_list);
810 : return ngroups;
811 : }
812 :
813 : static int sys_broken_setgroups(int setlen, gid_t *gidset)
814 : {
815 : GID_T *group_list;
816 : int i ;
817 :
818 : if (setlen == 0)
819 : return 0 ;
820 :
821 : if (setlen < 0 || setlen > setgroups_max()) {
822 : errno = EINVAL;
823 : return -1;
824 : }
825 :
826 : /*
827 : * Broken case. We need to allocate a
828 : * GID_T array of size setlen.
829 : */
830 :
831 : if((group_list = SMB_MALLOC_ARRAY(GID_T, setlen)) == NULL) {
832 : DEBUG(0,("sys_setgroups: Malloc fail.\n"));
833 : return -1;
834 : }
835 :
836 : for(i = 0; i < setlen; i++)
837 : group_list[i] = (GID_T) gidset[i];
838 :
839 : if(samba_setgroups(setlen, group_list) != 0) {
840 : int saved_errno = errno;
841 : SAFE_FREE(group_list);
842 : errno = saved_errno;
843 : return -1;
844 : }
845 :
846 : SAFE_FREE(group_list);
847 : return 0 ;
848 : }
849 :
850 : #endif /* HAVE_BROKEN_GETGROUPS */
851 :
852 : /* This is a list of systems that require the first GID passed to setgroups(2)
853 : * to be the effective GID. If your system is one of these, add it here.
854 : */
855 : #if defined (FREEBSD) || defined (DARWINOS)
856 : #define USE_BSD_SETGROUPS
857 : #endif
858 :
859 : #if defined(USE_BSD_SETGROUPS)
860 : /* Depending on the particular BSD implementation, the first GID that is
861 : * passed to setgroups(2) will either be ignored or will set the credential's
862 : * effective GID. In either case, the right thing to do is to guarantee that
863 : * gidset[0] is the effective GID.
864 : */
865 : static int sys_bsd_setgroups(gid_t primary_gid, int setlen, const gid_t *gidset)
866 : {
867 : gid_t *new_gidset = NULL;
868 : int max;
869 : int ret;
870 :
871 : /* setgroups(2) will fail with EINVAL if we pass too many groups. */
872 : max = setgroups_max();
873 :
874 : /* No group list, just make sure we are setting the effective GID. */
875 : if (setlen == 0) {
876 : return samba_setgroups(1, &primary_gid);
877 : }
878 :
879 : /* If the primary gid is not the first array element, grow the array
880 : * and insert it at the front.
881 : */
882 : if (gidset[0] != primary_gid) {
883 : new_gidset = SMB_MALLOC_ARRAY(gid_t, setlen + 1);
884 : if (new_gidset == NULL) {
885 : return -1;
886 : }
887 :
888 : memcpy(new_gidset + 1, gidset, (setlen * sizeof(gid_t)));
889 : new_gidset[0] = primary_gid;
890 : setlen++;
891 : }
892 :
893 : if (setlen > max) {
894 : DEBUG(3, ("forced to truncate group list from %d to %d\n",
895 : setlen, max));
896 : setlen = max;
897 : }
898 :
899 : #if defined(HAVE_BROKEN_GETGROUPS)
900 : ret = sys_broken_setgroups(setlen, new_gidset ? new_gidset : gidset);
901 : #else
902 : ret = samba_setgroups(setlen, new_gidset ? new_gidset : gidset);
903 : #endif
904 :
905 : if (new_gidset) {
906 : int errsav = errno;
907 : SAFE_FREE(new_gidset);
908 : errno = errsav;
909 : }
910 :
911 : return ret;
912 : }
913 :
914 : #endif /* USE_BSD_SETGROUPS */
915 :
916 : /**************************************************************************
917 : Wrapper for getgroups. Deals with broken (int) case.
918 : ****************************************************************************/
919 :
920 7597987 : int sys_getgroups(int setlen, gid_t *gidset)
921 : {
922 : #if defined(HAVE_BROKEN_GETGROUPS)
923 : return sys_broken_getgroups(setlen, gidset);
924 : #else
925 7597987 : return getgroups(setlen, gidset);
926 : #endif
927 : }
928 :
929 : /**************************************************************************
930 : Wrapper for setgroups. Deals with broken (int) case and BSD case.
931 : ****************************************************************************/
932 :
933 9879588 : int sys_setgroups(gid_t UNUSED(primary_gid), int setlen, gid_t *gidset)
934 : {
935 : #if !defined(HAVE_SETGROUPS)
936 : errno = ENOSYS;
937 : return -1;
938 : #endif /* HAVE_SETGROUPS */
939 :
940 : #if defined(USE_BSD_SETGROUPS)
941 : return sys_bsd_setgroups(primary_gid, setlen, gidset);
942 : #elif defined(HAVE_BROKEN_GETGROUPS)
943 : return sys_broken_setgroups(setlen, gidset);
944 : #else
945 9879588 : return samba_setgroups(setlen, gidset);
946 : #endif
947 : }
948 :
949 : /****************************************************************************
950 : Return the major devicenumber for UNIX extensions.
951 : ****************************************************************************/
952 :
953 576 : uint32_t unix_dev_major(SMB_DEV_T dev)
954 : {
955 : #if defined(HAVE_DEVICE_MAJOR_FN)
956 576 : return (uint32_t)major(dev);
957 : #else
958 : return (uint32_t)(dev >> 8);
959 : #endif
960 : }
961 :
962 : /****************************************************************************
963 : Return the minor devicenumber for UNIX extensions.
964 : ****************************************************************************/
965 :
966 576 : uint32_t unix_dev_minor(SMB_DEV_T dev)
967 : {
968 : #if defined(HAVE_DEVICE_MINOR_FN)
969 576 : return (uint32_t)minor(dev);
970 : #else
971 : return (uint32_t)(dev & 0xff);
972 : #endif
973 : }
974 :
975 : /**************************************************************************
976 : Wrapper for realpath.
977 : ****************************************************************************/
978 :
979 3522338 : char *sys_realpath(const char *path)
980 : {
981 12206 : char *result;
982 :
983 : #ifdef REALPATH_TAKES_NULL
984 3522338 : result = realpath(path, NULL);
985 : #else
986 : result = SMB_MALLOC_ARRAY(char, PATH_MAX + 1);
987 : if (result) {
988 : char *resolved_path = realpath(path, result);
989 : if (!resolved_path) {
990 : SAFE_FREE(result);
991 : } else {
992 : /* SMB_ASSERT(result == resolved_path) ? */
993 : result = resolved_path;
994 : }
995 : }
996 : #endif
997 3522338 : return result;
998 : }
999 :
1000 : #if 0
1001 : /*******************************************************************
1002 : Return the number of CPUs.
1003 : ********************************************************************/
1004 :
1005 : int sys_get_number_of_cores(void)
1006 : {
1007 : int ret = -1;
1008 :
1009 : #if defined(HAVE_SYSCONF)
1010 : #if defined(_SC_NPROCESSORS_ONLN)
1011 : ret = (int)sysconf(_SC_NPROCESSORS_ONLN);
1012 : #endif
1013 : #if defined(_SC_NPROCESSORS_CONF)
1014 : if (ret < 1) {
1015 : ret = (int)sysconf(_SC_NPROCESSORS_CONF);
1016 : }
1017 : #endif
1018 : #elif defined(HAVE_SYSCTL) && defined(CTL_HW)
1019 : int name[2];
1020 : unsigned int len = sizeof(ret);
1021 :
1022 : name[0] = CTL_HW;
1023 : #if defined(HW_AVAILCPU)
1024 : name[1] = HW_AVAILCPU;
1025 :
1026 : if (sysctl(name, 2, &ret, &len, NULL, 0) == -1) {
1027 : ret = -1;
1028 : }
1029 : #endif
1030 : #if defined(HW_NCPU)
1031 : if(ret < 1) {
1032 : name[0] = CTL_HW;
1033 : name[1] = HW_NCPU;
1034 : if (sysctl(nm, 2, &count, &len, NULL, 0) == -1) {
1035 : ret = -1;
1036 : }
1037 : }
1038 : #endif
1039 : #endif
1040 : if (ret < 1) {
1041 : ret = 1;
1042 : }
1043 : return ret;
1044 : }
1045 : #endif
1046 :
1047 323002 : bool sys_have_proc_fds(void)
1048 : {
1049 1273 : static bool checked = false;
1050 1273 : static bool have_proc_fds = false;
1051 1273 : struct stat sb;
1052 1273 : int ret;
1053 :
1054 323002 : if (checked) {
1055 294088 : return have_proc_fds;
1056 : }
1057 :
1058 28914 : ret = stat("/proc/self/fd/0", &sb);
1059 28914 : have_proc_fds = (ret == 0);
1060 28914 : checked = true;
1061 :
1062 28914 : return have_proc_fds;
1063 : }
1064 :
1065 266525 : char *sys_proc_fd_path(int fd, struct sys_proc_fd_path_buf *buf)
1066 : {
1067 399 : int written =
1068 266525 : snprintf(buf->buf, sizeof(buf->buf), "/proc/self/fd/%d", fd);
1069 :
1070 266525 : SMB_ASSERT(sys_have_proc_fds() && (written >= 0));
1071 :
1072 266525 : return buf->buf;
1073 : }
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