source: vendor/3.6.0/source3/modules/vfs_afsacl.c

Last change on this file was 740, checked in by Silvan Scherrer, 13 years ago

Samba Server: update vendor to 3.6.0
File size: 26.0 KB
Line 
1/*
2 * Convert AFS acls to NT acls and vice versa.
3 *
4 * Copyright (C) Volker Lendecke, 2003
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 3 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, see <http://www.gnu.org/licenses/>.
18 */
19
20#include "includes.h"
21#include "system/filesys.h"
22#include "smbd/smbd.h"
23#include "../librpc/gen_ndr/lsa.h"
24#include "../libcli/security/security.h"
25#include "../libcli/security/dom_sid.h"
26#include "passdb.h"
27
28#undef DBGC_CLASS
29#define DBGC_CLASS DBGC_VFS
30
31#include <afs/stds.h>
32#include <afs/afs.h>
33#include <afs/auth.h>
34#include <afs/venus.h>
35#include <afs/prs_fs.h>
36
37#define MAXSIZE 2048
38
39extern const struct dom_sid global_sid_World;
40extern const struct dom_sid global_sid_Builtin_Administrators;
41extern const struct dom_sid global_sid_Builtin_Backup_Operators;
42extern const struct dom_sid global_sid_Authenticated_Users;
43extern const struct dom_sid global_sid_NULL;
44
45static char space_replacement = '%';
46
47/* Do we expect SIDs as pts names? */
48static bool sidpts;
49
50extern int afs_syscall(int, char *, int, char *, int);
51
52struct afs_ace {
53 bool positive;
54 char *name;
55 struct dom_sid sid;
56 enum lsa_SidType type;
57 uint32 rights;
58 struct afs_ace *next;
59};
60
61struct afs_acl {
62 TALLOC_CTX *ctx;
63 int type;
64 int num_aces;
65 struct afs_ace *acelist;
66};
67
68struct afs_iob {
69 char *in, *out;
70 uint16 in_size, out_size;
71};
72
73
74static bool init_afs_acl(struct afs_acl *acl)
75{
76 ZERO_STRUCT(*acl);
77 acl->ctx = talloc_init("afs_acl");
78 if (acl->ctx == NULL) {
79 DEBUG(10, ("Could not init afs_acl"));
80 return False;
81 }
82 return True;
83}
84
85static void free_afs_acl(struct afs_acl *acl)
86{
87 if (acl->ctx != NULL)
88 talloc_destroy(acl->ctx);
89 acl->ctx = NULL;
90 acl->num_aces = 0;
91 acl->acelist = NULL;
92}
93
94static struct afs_ace *clone_afs_ace(TALLOC_CTX *mem_ctx, struct afs_ace *ace)
95{
96 struct afs_ace *result = TALLOC_P(mem_ctx, struct afs_ace);
97
98 if (result == NULL)
99 return NULL;
100
101 *result = *ace;
102
103 result->next = NULL;
104 result->name = talloc_strdup(mem_ctx, ace->name);
105
106 if (result->name == NULL) {
107 return NULL;
108 }
109
110 return result;
111}
112
113static struct afs_ace *new_afs_ace(TALLOC_CTX *mem_ctx,
114 bool positive,
115 const char *name, uint32 rights)
116{
117 struct dom_sid sid;
118 enum lsa_SidType type;
119 struct afs_ace *result;
120
121 if (strcmp(name, "system:administrators") == 0) {
122
123 sid_copy(&sid, &global_sid_Builtin_Administrators);
124 type = SID_NAME_ALIAS;
125
126 } else if (strcmp(name, "system:anyuser") == 0) {
127
128 sid_copy(&sid, &global_sid_World);
129 type = SID_NAME_ALIAS;
130
131 } else if (strcmp(name, "system:authuser") == 0) {
132
133 sid_copy(&sid, &global_sid_Authenticated_Users);
134 type = SID_NAME_WKN_GRP;
135
136 } else if (strcmp(name, "system:backup") == 0) {
137
138 sid_copy(&sid, &global_sid_Builtin_Backup_Operators);
139 type = SID_NAME_ALIAS;
140
141 } else if (sidpts) {
142 /* All PTS users/groups are expressed as SIDs */
143
144 sid_copy(&sid, &global_sid_NULL);
145 type = SID_NAME_UNKNOWN;
146
147 if (string_to_sid(&sid, name)) {
148 const char *user, *domain;
149 /* We have to find the type, look up the SID */
150 lookup_sid(talloc_tos(), &sid,
151 &domain, &user, &type);
152 }
153
154 } else {
155
156 const char *domain, *uname;
157 char *p;
158
159 p = strchr_m(name, *lp_winbind_separator());
160 if (p != NULL) {
161 *p = '\\';
162 }
163
164 if (!lookup_name(talloc_tos(), name, LOOKUP_NAME_ALL,
165 &domain, &uname, &sid, &type)) {
166 DEBUG(10, ("Could not find AFS user %s\n", name));
167
168 sid_copy(&sid, &global_sid_NULL);
169 type = SID_NAME_UNKNOWN;
170
171 }
172 }
173
174 result = TALLOC_P(mem_ctx, struct afs_ace);
175
176 if (result == NULL) {
177 DEBUG(0, ("Could not talloc AFS ace\n"));
178 return NULL;
179 }
180
181 result->name = talloc_strdup(mem_ctx, name);
182 if (result->name == NULL) {
183 DEBUG(0, ("Could not talloc AFS ace name\n"));
184 return NULL;
185 }
186
187 result->sid = sid;
188 result->type = type;
189
190 result->positive = positive;
191 result->rights = rights;
192
193 return result;
194}
195
196static void add_afs_ace(struct afs_acl *acl,
197 bool positive,
198 const char *name, uint32 rights)
199{
200 struct afs_ace *ace;
201
202 for (ace = acl->acelist; ace != NULL; ace = ace->next) {
203 if ((ace->positive == positive) &&
204 (strequal(ace->name, name))) {
205 ace->rights |= rights;
206 return;
207 }
208 }
209
210 ace = new_afs_ace(acl->ctx, positive, name, rights);
211
212 ace->next = acl->acelist;
213 acl->acelist = ace;
214
215 acl->num_aces += 1;
216
217 DEBUG(10, ("add_afs_ace: Added %s entry for %s with rights %d\n",
218 ace->positive?"positive":"negative",
219 ace->name, ace->rights));
220
221 return;
222}
223
224/* AFS ACLs in string form are a long string of fields delimited with \n.
225 *
226 * First line: Number of positive entries
227 * Second line: Number of negative entries
228 * Third and following lines: The entries themselves
229 *
230 * An ACE is a line of two fields, delimited by \t.
231 *
232 * First field: Name
233 * Second field: Rights
234 */
235
236static bool parse_afs_acl(struct afs_acl *acl, const char *acl_str)
237{
238 int nplus, nminus;
239 int aces;
240
241 char str[MAXSIZE+1];
242 char *p = str;
243
244 strncpy(str, acl_str, MAXSIZE);
245
246 if (sscanf(p, "%d", &nplus) != 1)
247 return False;
248
249 DEBUG(10, ("Found %d positive entries\n", nplus));
250
251 if ((p = strchr(p, '\n')) == NULL)
252 return False;
253 p += 1;
254
255 if (sscanf(p, "%d", &nminus) != 1)
256 return False;
257
258 DEBUG(10, ("Found %d negative entries\n", nminus));
259
260 if ((p = strchr(p, '\n')) == NULL)
261 return False;
262 p += 1;
263
264 for (aces = nplus+nminus; aces > 0; aces--)
265 {
266
267 const char *namep;
268 fstring name;
269 uint32 rights;
270 char *space;
271
272 namep = p;
273
274 if ((p = strchr(p, '\t')) == NULL)
275 return False;
276 *p = '\0';
277 p += 1;
278
279 if (sscanf(p, "%d", &rights) != 1)
280 return False;
281
282 if ((p = strchr(p, '\n')) == NULL)
283 return False;
284 p += 1;
285
286 fstrcpy(name, namep);
287
288 while ((space = strchr_m(name, space_replacement)) != NULL)
289 *space = ' ';
290
291 add_afs_ace(acl, nplus>0, name, rights);
292
293 nplus -= 1;
294 }
295
296 return True;
297}
298
299static bool unparse_afs_acl(struct afs_acl *acl, char *acl_str)
300{
301 /* TODO: String length checks!!!! */
302
303 int positives = 0;
304 int negatives = 0;
305 fstring line;
306
307 *acl_str = 0;
308
309 struct afs_ace *ace = acl->acelist;
310
311 while (ace != NULL) {
312 if (ace->positive)
313 positives++;
314 else
315 negatives++;
316 ace = ace->next;
317 }
318
319 fstr_sprintf(line, "%d\n", positives);
320 safe_strcat(acl_str, line, MAXSIZE);
321
322 fstr_sprintf(line, "%d\n", negatives);
323 safe_strcat(acl_str, line, MAXSIZE);
324
325 ace = acl->acelist;
326
327 while (ace != NULL) {
328 fstr_sprintf(line, "%s\t%d\n", ace->name, ace->rights);
329 safe_strcat(acl_str, line, MAXSIZE);
330 ace = ace->next;
331 }
332 return True;
333}
334
335static uint32 afs_to_nt_file_rights(uint32 rights)
336{
337 uint32 result = 0;
338
339 if (rights & PRSFS_READ)
340 result |= FILE_READ_DATA | FILE_READ_EA |
341 FILE_EXECUTE | FILE_READ_ATTRIBUTES |
342 READ_CONTROL_ACCESS | SYNCHRONIZE_ACCESS;
343
344 if (rights & PRSFS_WRITE)
345 result |= FILE_WRITE_DATA | FILE_WRITE_ATTRIBUTES |
346 FILE_WRITE_EA | FILE_APPEND_DATA;
347
348 if (rights & PRSFS_LOCK)
349 result |= WRITE_OWNER_ACCESS;
350
351 if (rights & PRSFS_DELETE)
352 result |= DELETE_ACCESS;
353
354 return result;
355}
356
357static void afs_to_nt_dir_rights(uint32 afs_rights, uint32 *nt_rights,
358 uint8 *flag)
359{
360 *nt_rights = 0;
361 *flag = SEC_ACE_FLAG_OBJECT_INHERIT |
362 SEC_ACE_FLAG_CONTAINER_INHERIT;
363
364 if (afs_rights & PRSFS_INSERT)
365 *nt_rights |= FILE_ADD_FILE | FILE_ADD_SUBDIRECTORY;
366
367 if (afs_rights & PRSFS_LOOKUP)
368 *nt_rights |= FILE_READ_DATA | FILE_READ_EA |
369 FILE_EXECUTE | FILE_READ_ATTRIBUTES |
370 READ_CONTROL_ACCESS | SYNCHRONIZE_ACCESS;
371
372 if (afs_rights & PRSFS_WRITE)
373 *nt_rights |= FILE_WRITE_ATTRIBUTES | FILE_WRITE_DATA |
374 FILE_APPEND_DATA | FILE_WRITE_EA;
375
376 if ((afs_rights & (PRSFS_INSERT|PRSFS_LOOKUP|PRSFS_DELETE)) ==
377 (PRSFS_INSERT|PRSFS_LOOKUP|PRSFS_DELETE))
378 *nt_rights |= FILE_WRITE_ATTRIBUTES | FILE_WRITE_EA |
379 GENERIC_WRITE_ACCESS;
380
381 if (afs_rights & PRSFS_DELETE)
382 *nt_rights |= DELETE_ACCESS;
383
384 if (afs_rights & PRSFS_ADMINISTER)
385 *nt_rights |= FILE_DELETE_CHILD | WRITE_DAC_ACCESS |
386 WRITE_OWNER_ACCESS;
387
388 if ( (afs_rights & PRSFS_LOOKUP) ==
389 (afs_rights & (PRSFS_LOOKUP|PRSFS_READ)) ) {
390 /* Only lookup right */
391 *flag = SEC_ACE_FLAG_CONTAINER_INHERIT;
392 }
393
394 return;
395}
396
397#define AFS_FILE_RIGHTS (PRSFS_READ|PRSFS_WRITE|PRSFS_LOCK)
398#define AFS_DIR_RIGHTS (PRSFS_INSERT|PRSFS_LOOKUP|PRSFS_DELETE|PRSFS_ADMINISTER)
399
400static void split_afs_acl(struct afs_acl *acl,
401 struct afs_acl *dir_acl,
402 struct afs_acl *file_acl)
403{
404 struct afs_ace *ace;
405
406 init_afs_acl(dir_acl);
407 init_afs_acl(file_acl);
408
409 for (ace = acl->acelist; ace != NULL; ace = ace->next) {
410 if (ace->rights & AFS_FILE_RIGHTS) {
411 add_afs_ace(file_acl, ace->positive, ace->name,
412 ace->rights & AFS_FILE_RIGHTS);
413 }
414
415 if (ace->rights & AFS_DIR_RIGHTS) {
416 add_afs_ace(dir_acl, ace->positive, ace->name,
417 ace->rights & AFS_DIR_RIGHTS);
418 }
419 }
420 return;
421}
422
423static bool same_principal(struct afs_ace *x, struct afs_ace *y)
424{
425 return ( (x->positive == y->positive) &&
426 (dom_sid_compare(&x->sid, &y->sid) == 0) );
427}
428
429static void merge_afs_acls(struct afs_acl *dir_acl,
430 struct afs_acl *file_acl,
431 struct afs_acl *target)
432{
433 struct afs_ace *ace;
434
435 init_afs_acl(target);
436
437 for (ace = dir_acl->acelist; ace != NULL; ace = ace->next) {
438 struct afs_ace *file_ace;
439 bool found = False;
440
441 for (file_ace = file_acl->acelist;
442 file_ace != NULL;
443 file_ace = file_ace->next) {
444 if (!same_principal(ace, file_ace))
445 continue;
446
447 add_afs_ace(target, ace->positive, ace->name,
448 ace->rights | file_ace->rights);
449 found = True;
450 break;
451 }
452 if (!found)
453 add_afs_ace(target, ace->positive, ace->name,
454 ace->rights);
455 }
456
457 for (ace = file_acl->acelist; ace != NULL; ace = ace->next) {
458 struct afs_ace *dir_ace;
459 bool already_seen = False;
460
461 for (dir_ace = dir_acl->acelist;
462 dir_ace != NULL;
463 dir_ace = dir_ace->next) {
464 if (!same_principal(ace, dir_ace))
465 continue;
466 already_seen = True;
467 break;
468 }
469 if (!already_seen)
470 add_afs_ace(target, ace->positive, ace->name,
471 ace->rights);
472 }
473}
474
475#define PERMS_READ 0x001200a9
476#define PERMS_CHANGE 0x001301bf
477#define PERMS_FULL 0x001f01ff
478
479static struct static_dir_ace_mapping {
480 uint8 type;
481 uint8 flags;
482 uint32 mask;
483 uint32 afs_rights;
484} ace_mappings[] = {
485
486 /* Full control */
487 { 0, SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT,
488 PERMS_FULL, 127 /* rlidwka */ },
489
490 /* Change (write) */
491 { 0, SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT,
492 PERMS_CHANGE, 63 /* rlidwk */ },
493
494 /* Read (including list folder content) */
495 { 0, SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT,
496 PERMS_READ, 9 /* rl */ },
497
498 /* Read without list folder content -- same as "l" */
499 { 0, SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT,
500 0x00120089, 8 /* l */ },
501
502 /* some stupid workaround for preventing fallbacks */
503 { 0, 0x3, 0x0012019F, 9 /* rl */ },
504 { 0, 0x13, PERMS_FULL, 127 /* full */ },
505
506 /* read, delete and execute access plus synchronize */
507 { 0, 0x3, 0x001300A9, 9 /* should be rdl, set to rl */},
508 /* classical read list */
509 { 0, 0x13, 0x001200A9, 9 /* rl */},
510 /* almost full control, no delete */
511 { 0, 0x13, PERMS_CHANGE, 63 /* rwidlk */},
512
513 /* List folder */
514 { 0, SEC_ACE_FLAG_CONTAINER_INHERIT,
515 PERMS_READ, 8 /* l */ },
516
517 /* FULL without inheritance -- in all cases here we also get
518 the corresponding INHERIT_ONLY ACE in the same ACL */
519 { 0, 0, PERMS_FULL, 127 /* rlidwka */ },
520
521 /* FULL inherit only -- counterpart to previous one */
522 { 0, SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_INHERIT_ONLY,
523 PERMS_FULL | SEC_GENERIC_WRITE, 127 /* rlidwka */ },
524
525 /* CHANGE without inheritance -- in all cases here we also get
526 the corresponding INHERIT_ONLY ACE in the same ACL */
527 { 0, 0, PERMS_CHANGE, 63 /* rlidwk */ },
528
529 /* CHANGE inherit only -- counterpart to previous one */
530 { 0, SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_INHERIT_ONLY,
531 PERMS_CHANGE | SEC_GENERIC_WRITE, 63 /* rlidwk */ },
532
533 /* End marker, hopefully there's no afs right 9999 :-) */
534 { 0, 0, 0, 9999 }
535};
536
537static uint32 nt_to_afs_dir_rights(const char *filename, const struct security_ace *ace)
538{
539 uint32 result = 0;
540 uint32 rights = ace->access_mask;
541 uint8 flags = ace->flags;
542
543 struct static_dir_ace_mapping *m;
544
545 for (m = &ace_mappings[0]; m->afs_rights != 9999; m++) {
546 if ( (ace->type == m->type) &&
547 (ace->flags == m->flags) &&
548 (ace->access_mask == m->mask) )
549 return m->afs_rights;
550 }
551
552 DEBUG(1, ("AFSACL FALLBACK: 0x%X 0x%X 0x%X %s %X\n",
553 ace->type, ace->flags, ace->access_mask, filename, rights));
554
555 if (rights & (GENERIC_ALL_ACCESS|WRITE_DAC_ACCESS)) {
556 result |= PRSFS_READ | PRSFS_WRITE | PRSFS_INSERT |
557 PRSFS_LOOKUP | PRSFS_DELETE | PRSFS_LOCK |
558 PRSFS_ADMINISTER;
559 }
560
561 if (rights & (GENERIC_READ_ACCESS|FILE_READ_DATA)) {
562 result |= PRSFS_LOOKUP;
563 if (flags & SEC_ACE_FLAG_OBJECT_INHERIT) {
564 result |= PRSFS_READ;
565 }
566 }
567
568 if (rights & (GENERIC_WRITE_ACCESS|FILE_WRITE_DATA)) {
569 result |= PRSFS_INSERT | PRSFS_DELETE;
570 if (flags & SEC_ACE_FLAG_OBJECT_INHERIT) {
571 result |= PRSFS_WRITE | PRSFS_LOCK;
572 }
573 }
574
575 return result;
576}
577
578static uint32 nt_to_afs_file_rights(const char *filename, const struct security_ace *ace)
579{
580 uint32 result = 0;
581 uint32 rights = ace->access_mask;
582
583 if (rights & (GENERIC_READ_ACCESS|FILE_READ_DATA)) {
584 result |= PRSFS_READ;
585 }
586
587 if (rights & (GENERIC_WRITE_ACCESS|FILE_WRITE_DATA)) {
588 result |= PRSFS_WRITE | PRSFS_LOCK;
589 }
590
591 return result;
592}
593
594static size_t afs_to_nt_acl_common(struct afs_acl *afs_acl,
595 SMB_STRUCT_STAT *psbuf,
596 uint32 security_info,
597 struct security_descriptor **ppdesc)
598{
599 struct security_ace *nt_ace_list;
600 struct dom_sid owner_sid, group_sid;
601 struct security_acl *psa = NULL;
602 int good_aces;
603 size_t sd_size;
604 TALLOC_CTX *mem_ctx = talloc_tos();
605
606 struct afs_ace *afs_ace;
607
608 uid_to_sid(&owner_sid, psbuf->st_ex_uid);
609 gid_to_sid(&group_sid, psbuf->st_ex_gid);
610
611 if (afs_acl->num_aces) {
612 nt_ace_list = TALLOC_ARRAY(mem_ctx, struct security_ace, afs_acl->num_aces);
613
614 if (nt_ace_list == NULL)
615 return 0;
616 } else {
617 nt_ace_list = NULL;
618 }
619
620 afs_ace = afs_acl->acelist;
621 good_aces = 0;
622
623 while (afs_ace != NULL) {
624 uint32_t nt_rights;
625 uint8 flag = SEC_ACE_FLAG_OBJECT_INHERIT |
626 SEC_ACE_FLAG_CONTAINER_INHERIT;
627
628 if (afs_ace->type == SID_NAME_UNKNOWN) {
629 DEBUG(10, ("Ignoring unknown name %s\n",
630 afs_ace->name));
631 afs_ace = afs_ace->next;
632 continue;
633 }
634
635 if (S_ISDIR(psbuf->st_ex_mode))
636 afs_to_nt_dir_rights(afs_ace->rights, &nt_rights,
637 &flag);
638 else
639 nt_rights = afs_to_nt_file_rights(afs_ace->rights);
640
641 init_sec_ace(&nt_ace_list[good_aces++], &(afs_ace->sid),
642 SEC_ACE_TYPE_ACCESS_ALLOWED, nt_rights, flag);
643 afs_ace = afs_ace->next;
644 }
645
646 psa = make_sec_acl(mem_ctx, NT4_ACL_REVISION,
647 good_aces, nt_ace_list);
648 if (psa == NULL)
649 return 0;
650
651 *ppdesc = make_sec_desc(mem_ctx, SD_REVISION,
652 SEC_DESC_SELF_RELATIVE,
653 (security_info & SECINFO_OWNER)
654 ? &owner_sid : NULL,
655 (security_info & SECINFO_GROUP)
656 ? &group_sid : NULL,
657 NULL, psa, &sd_size);
658
659 return sd_size;
660}
661
662static size_t afs_to_nt_acl(struct afs_acl *afs_acl,
663 struct connection_struct *conn,
664 struct smb_filename *smb_fname,
665 uint32 security_info,
666 struct security_descriptor **ppdesc)
667{
668 int ret;
669
670 /* Get the stat struct for the owner info. */
671 if (lp_posix_pathnames()) {
672 ret = SMB_VFS_LSTAT(conn, smb_fname);
673 } else {
674 ret = SMB_VFS_STAT(conn, smb_fname);
675 }
676 if (ret == -1) {
677 return 0;
678 }
679
680 return afs_to_nt_acl_common(afs_acl, &smb_fname->st, security_info,
681 ppdesc);
682}
683
684static size_t afs_fto_nt_acl(struct afs_acl *afs_acl,
685 struct files_struct *fsp,
686 uint32 security_info,
687 struct security_descriptor **ppdesc)
688{
689 SMB_STRUCT_STAT sbuf;
690
691 if (fsp->fh->fd == -1) {
692 /* Get the stat struct for the owner info. */
693 return afs_to_nt_acl(afs_acl, fsp->conn, fsp->fsp_name,
694 security_info, ppdesc);
695 }
696
697 if(SMB_VFS_FSTAT(fsp, &sbuf) != 0) {
698 return 0;
699 }
700
701 return afs_to_nt_acl_common(afs_acl, &sbuf, security_info, ppdesc);
702}
703
704static bool mappable_sid(const struct dom_sid *sid)
705{
706 struct dom_sid domain_sid;
707
708 if (dom_sid_compare(sid, &global_sid_Builtin_Administrators) == 0)
709 return True;
710
711 if (dom_sid_compare(sid, &global_sid_World) == 0)
712 return True;
713
714 if (dom_sid_compare(sid, &global_sid_Authenticated_Users) == 0)
715 return True;
716
717 if (dom_sid_compare(sid, &global_sid_Builtin_Backup_Operators) == 0)
718 return True;
719
720 string_to_sid(&domain_sid, "S-1-5-21");
721
722 if (sid_compare_domain(sid, &domain_sid) == 0)
723 return True;
724
725 return False;
726}
727
728static bool nt_to_afs_acl(const char *filename,
729 uint32 security_info_sent,
730 const struct security_descriptor *psd,
731 uint32 (*nt_to_afs_rights)(const char *filename,
732 const struct security_ace *ace),
733 struct afs_acl *afs_acl)
734{
735 const struct security_acl *dacl;
736 int i;
737
738 /* Currently we *only* look at the dacl */
739
740 if (((security_info_sent & SECINFO_DACL) == 0) ||
741 (psd->dacl == NULL))
742 return True;
743
744 if (!init_afs_acl(afs_acl))
745 return False;
746
747 dacl = psd->dacl;
748
749 for (i = 0; i < dacl->num_aces; i++) {
750 const struct security_ace *ace = &(dacl->aces[i]);
751 const char *dom_name, *name;
752 enum lsa_SidType name_type;
753 char *p;
754
755 if (ace->type != SEC_ACE_TYPE_ACCESS_ALLOWED) {
756 /* First cut: Only positive ACEs */
757 return False;
758 }
759
760 if (!mappable_sid(&ace->trustee)) {
761 DEBUG(10, ("Ignoring unmappable SID %s\n",
762 sid_string_dbg(&ace->trustee)));
763 continue;
764 }
765
766 if (dom_sid_compare(&ace->trustee,
767 &global_sid_Builtin_Administrators) == 0) {
768
769 name = "system:administrators";
770
771 } else if (dom_sid_compare(&ace->trustee,
772 &global_sid_World) == 0) {
773
774 name = "system:anyuser";
775
776 } else if (dom_sid_compare(&ace->trustee,
777 &global_sid_Authenticated_Users) == 0) {
778
779 name = "system:authuser";
780
781 } else if (dom_sid_compare(&ace->trustee,
782 &global_sid_Builtin_Backup_Operators)
783 == 0) {
784
785 name = "system:backup";
786
787 } else {
788
789 if (!lookup_sid(talloc_tos(), &ace->trustee,
790 &dom_name, &name, &name_type)) {
791 DEBUG(1, ("AFSACL: Could not lookup SID %s on file %s\n",
792 sid_string_dbg(&ace->trustee),
793 filename));
794 continue;
795 }
796
797 if ( (name_type == SID_NAME_USER) ||
798 (name_type == SID_NAME_DOM_GRP) ||
799 (name_type == SID_NAME_ALIAS) ) {
800 char *tmp;
801 tmp = talloc_asprintf(talloc_tos(), "%s%s%s",
802 dom_name, lp_winbind_separator(),
803 name);
804 if (tmp == NULL) {
805 return False;
806 }
807 strlower_m(tmp);
808 name = tmp;
809 }
810
811 if (sidpts) {
812 /* Expect all users/groups in pts as SIDs */
813 name = talloc_strdup(
814 talloc_tos(),
815 sid_string_tos(&ace->trustee));
816 if (name == NULL) {
817 return False;
818 }
819 }
820 }
821
822 while ((p = strchr_m(name, ' ')) != NULL)
823 *p = space_replacement;
824
825 add_afs_ace(afs_acl, True, name,
826 nt_to_afs_rights(filename, ace));
827 }
828
829 return True;
830}
831
832static bool afs_get_afs_acl(char *filename, struct afs_acl *acl)
833{
834 struct afs_iob iob;
835
836 int ret;
837
838 char space[MAXSIZE];
839
840 DEBUG(5, ("afs_get_afs_acl: %s\n", filename));
841
842 iob.in_size = 0;
843 iob.out_size = MAXSIZE;
844 iob.in = iob.out = space;
845
846 ret = afs_syscall(AFSCALL_PIOCTL, filename, VIOCGETAL,
847 (char *)&iob, 0);
848
849 if (ret) {
850 DEBUG(1, ("got error from PIOCTL: %d\n", ret));
851 return False;
852 }
853
854 if (!init_afs_acl(acl))
855 return False;
856
857 if (!parse_afs_acl(acl, space)) {
858 DEBUG(1, ("Could not parse AFS acl\n"));
859 free_afs_acl(acl);
860 return False;
861 }
862
863 return True;
864}
865
866/* For setting an AFS ACL we have to take care of the ACEs we could
867 * not properly map to SIDs. Merge all of them into the new ACL. */
868
869static void merge_unknown_aces(struct afs_acl *src, struct afs_acl *dst)
870{
871 struct afs_ace *ace;
872
873 for (ace = src->acelist; ace != NULL; ace = ace->next)
874 {
875 struct afs_ace *copy;
876
877 if (ace->type != SID_NAME_UNKNOWN) {
878 DEBUG(10, ("Not merging known ACE for %s\n",
879 ace->name));
880 continue;
881 }
882
883 DEBUG(10, ("Merging unknown ACE for %s\n", ace->name));
884
885 copy = clone_afs_ace(dst->ctx, ace);
886
887 if (copy == NULL) {
888 DEBUG(0, ("Could not clone ACE for %s\n", ace->name));
889 continue;
890 }
891
892 copy->next = dst->acelist;
893 dst->acelist = copy;
894 dst->num_aces += 1;
895 }
896}
897
898static NTSTATUS afs_set_nt_acl(vfs_handle_struct *handle, files_struct *fsp,
899 uint32 security_info_sent,
900 const struct security_descriptor *psd)
901{
902 struct afs_acl old_afs_acl, new_afs_acl;
903 struct afs_acl dir_acl, file_acl;
904 char acl_string[2049];
905 struct afs_iob iob;
906 int ret = -1;
907 char *name = NULL;
908 const char *fileacls;
909
910 fileacls = lp_parm_const_string(SNUM(handle->conn), "afsacl", "fileacls",
911 "yes");
912
913 sidpts = lp_parm_bool(SNUM(handle->conn), "afsacl", "sidpts", False);
914
915 ZERO_STRUCT(old_afs_acl);
916 ZERO_STRUCT(new_afs_acl);
917 ZERO_STRUCT(dir_acl);
918 ZERO_STRUCT(file_acl);
919
920 name = talloc_strdup(talloc_tos(), fsp->fsp_name->base_name);
921 if (!name) {
922 return NT_STATUS_NO_MEMORY;
923 }
924
925 if (!fsp->is_directory) {
926 /* We need to get the name of the directory containing the
927 * file, this is where the AFS acls live */
928 char *p = strrchr(name, '/');
929 if (p != NULL) {
930 *p = '\0';
931 } else {
932 name = talloc_strdup(talloc_tos(), ".");
933 if (!name) {
934 return NT_STATUS_NO_MEMORY;
935 }
936 }
937 }
938
939 if (!afs_get_afs_acl(name, &old_afs_acl)) {
940 DEBUG(3, ("Could not get old ACL of %s\n", fsp_str_dbg(fsp)));
941 goto done;
942 }
943
944 split_afs_acl(&old_afs_acl, &dir_acl, &file_acl);
945
946 if (fsp->is_directory) {
947
948 if (!strequal(fileacls, "yes")) {
949 /* Throw away file acls, we depend on the
950 * inheritance ACEs that also give us file
951 * permissions */
952 free_afs_acl(&file_acl);
953 }
954
955 free_afs_acl(&dir_acl);
956 if (!nt_to_afs_acl(fsp->fsp_name->base_name,
957 security_info_sent, psd,
958 nt_to_afs_dir_rights, &dir_acl))
959 goto done;
960 } else {
961 if (strequal(fileacls, "no")) {
962 ret = -1;
963 goto done;
964 }
965
966 if (strequal(fileacls, "ignore")) {
967 ret = 0;
968 goto done;
969 }
970
971 free_afs_acl(&file_acl);
972 if (!nt_to_afs_acl(fsp->fsp_name->base_name,
973 security_info_sent, psd,
974 nt_to_afs_file_rights, &file_acl))
975 goto done;
976 }
977
978 merge_afs_acls(&dir_acl, &file_acl, &new_afs_acl);
979
980 merge_unknown_aces(&old_afs_acl, &new_afs_acl);
981
982 unparse_afs_acl(&new_afs_acl, acl_string);
983
984 iob.in = acl_string;
985 iob.in_size = 1+strlen(iob.in);
986 iob.out = NULL;
987 iob.out_size = 0;
988
989 DEBUG(10, ("trying to set acl '%s' on file %s\n", iob.in, name));
990
991 ret = afs_syscall(AFSCALL_PIOCTL, name, VIOCSETAL, (char *)&iob, 0);
992
993 if (ret != 0) {
994 DEBUG(10, ("VIOCSETAL returned %d\n", ret));
995 }
996
997 done:
998 free_afs_acl(&dir_acl);
999 free_afs_acl(&file_acl);
1000 free_afs_acl(&old_afs_acl);
1001 free_afs_acl(&new_afs_acl);
1002
1003 return (ret == 0) ? NT_STATUS_OK : NT_STATUS_ACCESS_DENIED;
1004}
1005
1006static NTSTATUS afsacl_fget_nt_acl(struct vfs_handle_struct *handle,
1007 struct files_struct *fsp,
1008 uint32 security_info,
1009 struct security_descriptor **ppdesc)
1010{
1011 struct afs_acl acl;
1012 size_t sd_size;
1013
1014 DEBUG(5, ("afsacl_fget_nt_acl: %s\n", fsp_str_dbg(fsp)));
1015
1016 sidpts = lp_parm_bool(SNUM(fsp->conn), "afsacl", "sidpts", False);
1017
1018 if (!afs_get_afs_acl(fsp->fsp_name->base_name, &acl)) {
1019 return NT_STATUS_ACCESS_DENIED;
1020 }
1021
1022 sd_size = afs_fto_nt_acl(&acl, fsp, security_info, ppdesc);
1023
1024 free_afs_acl(&acl);
1025
1026 return (sd_size != 0) ? NT_STATUS_OK : NT_STATUS_ACCESS_DENIED;
1027}
1028
1029static NTSTATUS afsacl_get_nt_acl(struct vfs_handle_struct *handle,
1030 const char *name, uint32 security_info,
1031 struct security_descriptor **ppdesc)
1032{
1033 struct afs_acl acl;
1034 size_t sd_size;
1035 struct smb_filename *smb_fname = NULL;
1036 NTSTATUS status;
1037
1038 DEBUG(5, ("afsacl_get_nt_acl: %s\n", name));
1039
1040 sidpts = lp_parm_bool(SNUM(handle->conn), "afsacl", "sidpts", False);
1041
1042 if (!afs_get_afs_acl(name, &acl)) {
1043 return NT_STATUS_ACCESS_DENIED;
1044 }
1045
1046 status = create_synthetic_smb_fname(talloc_tos(), name, NULL, NULL,
1047 &smb_fname);
1048 if (!NT_STATUS_IS_OK(status)) {
1049 free_afs_acl(&acl);
1050 return status;
1051 }
1052
1053 sd_size = afs_to_nt_acl(&acl, handle->conn, smb_fname, security_info,
1054 ppdesc);
1055 TALLOC_FREE(smb_fname);
1056
1057 free_afs_acl(&acl);
1058
1059 return (sd_size != 0) ? NT_STATUS_OK : NT_STATUS_ACCESS_DENIED;
1060}
1061
1062NTSTATUS afsacl_fset_nt_acl(vfs_handle_struct *handle,
1063 files_struct *fsp,
1064 uint32 security_info_sent,
1065 const struct security_descriptor *psd)
1066{
1067 return afs_set_nt_acl(handle, fsp, security_info_sent, psd);
1068}
1069
1070static int afsacl_connect(vfs_handle_struct *handle,
1071 const char *service,
1072 const char *user)
1073{
1074 const char *spc;
1075 int ret = SMB_VFS_NEXT_CONNECT(handle, service, user);
1076
1077 if (ret < 0) {
1078 return ret;
1079 }
1080
1081 spc = lp_parm_const_string(SNUM(handle->conn), "afsacl", "space", "%");
1082
1083 if (spc != NULL)
1084 space_replacement = spc[0];
1085
1086 return 0;
1087}
1088
1089static struct vfs_fn_pointers vfs_afsacl_fns = {
1090 .connect_fn = afsacl_connect,
1091 .fget_nt_acl = afsacl_fget_nt_acl,
1092 .get_nt_acl = afsacl_get_nt_acl,
1093 .fset_nt_acl = afsacl_fset_nt_acl
1094};
1095
1096NTSTATUS vfs_afsacl_init(void);
1097NTSTATUS vfs_afsacl_init(void)
1098{
1099 return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "afsacl",
1100 &vfs_afsacl_fns);
1101}
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