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

Last change on this file was 988, checked in by Silvan Scherrer, 9 years ago

Samba Server: update vendor to version 4.4.3
File size: 25.8 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#include "lib/afs/afs_settoken.h"
28
29#undef DBGC_CLASS
30#define DBGC_CLASS DBGC_VFS
31
32#include <afs/stds.h>
33#include <afs/afs_args.h>
34#include <afs/venus.h>
35#include <afs/prs_fs.h>
36
37#define MAXSIZE 2049
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
50struct afs_ace {
51 bool positive;
52 char *name;
53 struct dom_sid sid;
54 enum lsa_SidType type;
55 uint32_t rights;
56 struct afs_ace *next;
57};
58
59struct afs_acl {
60 TALLOC_CTX *ctx;
61 int type;
62 int num_aces;
63 struct afs_ace *acelist;
64};
65
66struct afs_iob {
67 char *in, *out;
68 uint16_t in_size, out_size;
69};
70
71
72static bool init_afs_acl(struct afs_acl *acl)
73{
74 ZERO_STRUCT(*acl);
75 acl->ctx = talloc_init("afs_acl");
76 if (acl->ctx == NULL) {
77 DEBUG(10, ("Could not init afs_acl"));
78 return false;
79 }
80 return true;
81}
82
83static void free_afs_acl(struct afs_acl *acl)
84{
85 if (acl->ctx != NULL)
86 talloc_destroy(acl->ctx);
87 acl->ctx = NULL;
88 acl->num_aces = 0;
89 acl->acelist = NULL;
90}
91
92static struct afs_ace *clone_afs_ace(TALLOC_CTX *mem_ctx, struct afs_ace *ace)
93{
94 struct afs_ace *result = talloc(mem_ctx, struct afs_ace);
95
96 if (result == NULL)
97 return NULL;
98
99 *result = *ace;
100
101 result->next = NULL;
102 result->name = talloc_strdup(mem_ctx, ace->name);
103
104 if (result->name == NULL) {
105 return NULL;
106 }
107
108 return result;
109}
110
111static struct afs_ace *new_afs_ace(TALLOC_CTX *mem_ctx,
112 bool positive,
113 const char *name, uint32_t rights)
114{
115 struct dom_sid sid;
116 enum lsa_SidType type;
117 struct afs_ace *result;
118
119 if (strcmp(name, "system:administrators") == 0) {
120
121 sid_copy(&sid, &global_sid_Builtin_Administrators);
122 type = SID_NAME_ALIAS;
123
124 } else if (strcmp(name, "system:anyuser") == 0) {
125
126 sid_copy(&sid, &global_sid_World);
127 type = SID_NAME_ALIAS;
128
129 } else if (strcmp(name, "system:authuser") == 0) {
130
131 sid_copy(&sid, &global_sid_Authenticated_Users);
132 type = SID_NAME_WKN_GRP;
133
134 } else if (strcmp(name, "system:backup") == 0) {
135
136 sid_copy(&sid, &global_sid_Builtin_Backup_Operators);
137 type = SID_NAME_ALIAS;
138
139 } else if (sidpts) {
140 /* All PTS users/groups are expressed as SIDs */
141
142 sid_copy(&sid, &global_sid_NULL);
143 type = SID_NAME_UNKNOWN;
144
145 if (string_to_sid(&sid, name)) {
146 const char *user, *domain;
147 /* We have to find the type, look up the SID */
148 lookup_sid(talloc_tos(), &sid,
149 &domain, &user, &type);
150 }
151
152 } else {
153
154 const char *domain, *uname;
155 char *p;
156
157 p = strchr_m(name, *lp_winbind_separator());
158 if (p != NULL) {
159 *p = '\\';
160 }
161
162 if (!lookup_name(talloc_tos(), name, LOOKUP_NAME_ALL,
163 &domain, &uname, &sid, &type)) {
164 DEBUG(10, ("Could not find AFS user %s\n", name));
165
166 sid_copy(&sid, &global_sid_NULL);
167 type = SID_NAME_UNKNOWN;
168
169 }
170 }
171
172 result = talloc(mem_ctx, struct afs_ace);
173
174 if (result == NULL) {
175 DEBUG(0, ("Could not talloc AFS ace\n"));
176 return NULL;
177 }
178
179 result->name = talloc_strdup(mem_ctx, name);
180 if (result->name == NULL) {
181 DEBUG(0, ("Could not talloc AFS ace name\n"));
182 return NULL;
183 }
184
185 result->sid = sid;
186 result->type = type;
187
188 result->positive = positive;
189 result->rights = rights;
190
191 return result;
192}
193
194static void add_afs_ace(struct afs_acl *acl,
195 bool positive,
196 const char *name, uint32_t rights)
197{
198 struct afs_ace *ace;
199
200 for (ace = acl->acelist; ace != NULL; ace = ace->next) {
201 if ((ace->positive == positive) &&
202 (strequal(ace->name, name))) {
203 ace->rights |= rights;
204 return;
205 }
206 }
207
208 ace = new_afs_ace(acl->ctx, positive, name, rights);
209
210 ace->next = acl->acelist;
211 acl->acelist = ace;
212
213 acl->num_aces += 1;
214
215 DEBUG(10, ("add_afs_ace: Added %s entry for %s with rights %d\n",
216 ace->positive?"positive":"negative",
217 ace->name, ace->rights));
218}
219
220/* AFS ACLs in string form are a long string of fields delimited with \n.
221 *
222 * First line: Number of positive entries
223 * Second line: Number of negative entries
224 * Third and following lines: The entries themselves
225 *
226 * An ACE is a line of two fields, delimited by \t.
227 *
228 * First field: Name
229 * Second field: Rights
230 */
231
232static bool parse_afs_acl(struct afs_acl *acl, const char *acl_str)
233{
234 int nplus, nminus;
235 int aces;
236
237 char str[MAXSIZE];
238 char *p = str;
239
240 strlcpy(str, acl_str, MAXSIZE);
241
242 if (sscanf(p, "%d", &nplus) != 1)
243 return false;
244
245 DEBUG(10, ("Found %d positive entries\n", nplus));
246
247 if ((p = strchr(p, '\n')) == NULL)
248 return false;
249 p += 1;
250
251 if (sscanf(p, "%d", &nminus) != 1)
252 return false;
253
254 DEBUG(10, ("Found %d negative entries\n", nminus));
255
256 if ((p = strchr(p, '\n')) == NULL)
257 return false;
258 p += 1;
259
260 for (aces = nplus+nminus; aces > 0; aces--)
261 {
262
263 const char *namep;
264 fstring name;
265 uint32_t rights;
266 char *space;
267
268 namep = p;
269
270 if ((p = strchr(p, '\t')) == NULL)
271 return false;
272 *p = '\0';
273 p += 1;
274
275 if (sscanf(p, "%d", &rights) != 1)
276 return false;
277
278 if ((p = strchr(p, '\n')) == NULL)
279 return false;
280 p += 1;
281
282 fstrcpy(name, namep);
283
284 while ((space = strchr_m(name, space_replacement)) != NULL)
285 *space = ' ';
286
287 add_afs_ace(acl, nplus>0, name, rights);
288
289 nplus -= 1;
290 }
291
292 return true;
293}
294
295static bool unparse_afs_acl(struct afs_acl *acl, char *acl_str)
296{
297 /* TODO: String length checks!!!! */
298
299 int positives = 0;
300 int negatives = 0;
301 fstring line;
302 struct afs_ace *ace = acl->acelist;
303
304 *acl_str = 0;
305
306 while (ace != NULL) {
307 if (ace->positive)
308 positives++;
309 else
310 negatives++;
311 ace = ace->next;
312 }
313
314 fstr_sprintf(line, "%d\n", positives);
315 if (strlcat(acl_str, line, MAXSIZE) >= MAXSIZE) {
316 return false;
317 }
318
319 fstr_sprintf(line, "%d\n", negatives);
320 if (strlcat(acl_str, line, MAXSIZE) >= MAXSIZE) {
321 return false;
322 }
323
324 ace = acl->acelist;
325
326 while (ace != NULL) {
327 fstr_sprintf(line, "%s\t%d\n", ace->name, ace->rights);
328 if (strlcat(acl_str, line, MAXSIZE) >= MAXSIZE) {
329 return false;
330 }
331 ace = ace->next;
332 }
333 return true;
334}
335
336static uint32_t afs_to_nt_file_rights(uint32_t rights)
337{
338 uint32_t result = 0;
339
340 if (rights & PRSFS_READ)
341 result |= FILE_READ_DATA | FILE_READ_EA |
342 FILE_EXECUTE | FILE_READ_ATTRIBUTES |
343 READ_CONTROL_ACCESS | SYNCHRONIZE_ACCESS;
344
345 if (rights & PRSFS_WRITE)
346 result |= FILE_WRITE_DATA | FILE_WRITE_ATTRIBUTES |
347 FILE_WRITE_EA | FILE_APPEND_DATA;
348
349 if (rights & PRSFS_LOCK)
350 result |= WRITE_OWNER_ACCESS;
351
352 if (rights & PRSFS_DELETE)
353 result |= DELETE_ACCESS;
354
355 return result;
356}
357
358static void afs_to_nt_dir_rights(uint32_t afs_rights, uint32_t *nt_rights,
359 uint8_t *flag)
360{
361 *nt_rights = 0;
362 *flag = SEC_ACE_FLAG_OBJECT_INHERIT |
363 SEC_ACE_FLAG_CONTAINER_INHERIT;
364
365 if (afs_rights & PRSFS_INSERT)
366 *nt_rights |= FILE_ADD_FILE | FILE_ADD_SUBDIRECTORY;
367
368 if (afs_rights & PRSFS_LOOKUP)
369 *nt_rights |= FILE_READ_DATA | FILE_READ_EA |
370 FILE_EXECUTE | FILE_READ_ATTRIBUTES |
371 READ_CONTROL_ACCESS | SYNCHRONIZE_ACCESS;
372
373 if (afs_rights & PRSFS_WRITE)
374 *nt_rights |= FILE_WRITE_ATTRIBUTES | FILE_WRITE_DATA |
375 FILE_APPEND_DATA | FILE_WRITE_EA;
376
377 if ((afs_rights & (PRSFS_INSERT|PRSFS_LOOKUP|PRSFS_DELETE)) ==
378 (PRSFS_INSERT|PRSFS_LOOKUP|PRSFS_DELETE))
379 *nt_rights |= FILE_WRITE_ATTRIBUTES | FILE_WRITE_EA |
380 GENERIC_WRITE_ACCESS;
381
382 if (afs_rights & PRSFS_DELETE)
383 *nt_rights |= DELETE_ACCESS;
384
385 if (afs_rights & PRSFS_ADMINISTER)
386 *nt_rights |= FILE_DELETE_CHILD | WRITE_DAC_ACCESS |
387 WRITE_OWNER_ACCESS;
388
389 if ( (afs_rights & PRSFS_LOOKUP) ==
390 (afs_rights & (PRSFS_LOOKUP|PRSFS_READ)) ) {
391 /* Only lookup right */
392 *flag = SEC_ACE_FLAG_CONTAINER_INHERIT;
393 }
394}
395
396#define AFS_FILE_RIGHTS (PRSFS_READ|PRSFS_WRITE|PRSFS_LOCK)
397#define AFS_DIR_RIGHTS (PRSFS_INSERT|PRSFS_LOOKUP|PRSFS_DELETE|PRSFS_ADMINISTER)
398
399static void split_afs_acl(struct afs_acl *acl,
400 struct afs_acl *dir_acl,
401 struct afs_acl *file_acl)
402{
403 struct afs_ace *ace;
404
405 init_afs_acl(dir_acl);
406 init_afs_acl(file_acl);
407
408 for (ace = acl->acelist; ace != NULL; ace = ace->next) {
409 if (ace->rights & AFS_FILE_RIGHTS) {
410 add_afs_ace(file_acl, ace->positive, ace->name,
411 ace->rights & AFS_FILE_RIGHTS);
412 }
413
414 if (ace->rights & AFS_DIR_RIGHTS) {
415 add_afs_ace(dir_acl, ace->positive, ace->name,
416 ace->rights & AFS_DIR_RIGHTS);
417 }
418 }
419}
420
421static bool same_principal(struct afs_ace *x, struct afs_ace *y)
422{
423 return ( (x->positive == y->positive) &&
424 (dom_sid_compare(&x->sid, &y->sid) == 0) );
425}
426
427static void merge_afs_acls(struct afs_acl *dir_acl,
428 struct afs_acl *file_acl,
429 struct afs_acl *target)
430{
431 struct afs_ace *ace;
432
433 init_afs_acl(target);
434
435 for (ace = dir_acl->acelist; ace != NULL; ace = ace->next) {
436 struct afs_ace *file_ace;
437 bool found = false;
438
439 for (file_ace = file_acl->acelist;
440 file_ace != NULL;
441 file_ace = file_ace->next) {
442 if (!same_principal(ace, file_ace))
443 continue;
444
445 add_afs_ace(target, ace->positive, ace->name,
446 ace->rights | file_ace->rights);
447 found = true;
448 break;
449 }
450 if (!found)
451 add_afs_ace(target, ace->positive, ace->name,
452 ace->rights);
453 }
454
455 for (ace = file_acl->acelist; ace != NULL; ace = ace->next) {
456 struct afs_ace *dir_ace;
457 bool already_seen = false;
458
459 for (dir_ace = dir_acl->acelist;
460 dir_ace != NULL;
461 dir_ace = dir_ace->next) {
462 if (!same_principal(ace, dir_ace))
463 continue;
464 already_seen = true;
465 break;
466 }
467 if (!already_seen)
468 add_afs_ace(target, ace->positive, ace->name,
469 ace->rights);
470 }
471}
472
473#define PERMS_READ 0x001200a9
474#define PERMS_CHANGE 0x001301bf
475#define PERMS_FULL 0x001f01ff
476
477static struct static_dir_ace_mapping {
478 uint8_t type;
479 uint8_t flags;
480 uint32_t mask;
481 uint32_t afs_rights;
482} ace_mappings[] = {
483
484 /* Full control */
485 { 0, SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT,
486 PERMS_FULL, 127 /* rlidwka */ },
487
488 /* Change (write) */
489 { 0, SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT,
490 PERMS_CHANGE, 63 /* rlidwk */ },
491
492 /* Read (including list folder content) */
493 { 0, SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT,
494 PERMS_READ, 9 /* rl */ },
495
496 /* Read without list folder content -- same as "l" */
497 { 0, SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT,
498 0x00120089, 8 /* l */ },
499
500 /* some stupid workaround for preventing fallbacks */
501 { 0, 0x3, 0x0012019F, 9 /* rl */ },
502 { 0, 0x13, PERMS_FULL, 127 /* full */ },
503
504 /* read, delete and execute access plus synchronize */
505 { 0, 0x3, 0x001300A9, 9 /* should be rdl, set to rl */},
506 /* classical read list */
507 { 0, 0x13, 0x001200A9, 9 /* rl */},
508 /* almost full control, no delete */
509 { 0, 0x13, PERMS_CHANGE, 63 /* rwidlk */},
510
511 /* List folder */
512 { 0, SEC_ACE_FLAG_CONTAINER_INHERIT,
513 PERMS_READ, 8 /* l */ },
514
515 /* FULL without inheritance -- in all cases here we also get
516 the corresponding INHERIT_ONLY ACE in the same ACL */
517 { 0, 0, PERMS_FULL, 127 /* rlidwka */ },
518
519 /* FULL inherit only -- counterpart to previous one */
520 { 0, SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_INHERIT_ONLY,
521 PERMS_FULL | SEC_GENERIC_WRITE, 127 /* rlidwka */ },
522
523 /* CHANGE without inheritance -- in all cases here we also get
524 the corresponding INHERIT_ONLY ACE in the same ACL */
525 { 0, 0, PERMS_CHANGE, 63 /* rlidwk */ },
526
527 /* CHANGE inherit only -- counterpart to previous one */
528 { 0, SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_INHERIT_ONLY,
529 PERMS_CHANGE | SEC_GENERIC_WRITE, 63 /* rlidwk */ },
530
531 /* End marker, hopefully there's no afs right 9999 :-) */
532 { 0, 0, 0, 9999 }
533};
534
535static uint32_t nt_to_afs_dir_rights(const char *filename, const struct security_ace *ace)
536{
537 uint32_t result = 0;
538 uint32_t rights = ace->access_mask;
539 uint8_t flags = ace->flags;
540
541 struct static_dir_ace_mapping *m;
542
543 for (m = &ace_mappings[0]; m->afs_rights != 9999; m++) {
544 if ( (ace->type == m->type) &&
545 (ace->flags == m->flags) &&
546 (ace->access_mask == m->mask) )
547 return m->afs_rights;
548 }
549
550 DEBUG(1, ("AFSACL FALLBACK: 0x%X 0x%X 0x%X %s %X\n",
551 ace->type, ace->flags, ace->access_mask, filename, rights));
552
553 if (rights & (GENERIC_ALL_ACCESS|WRITE_DAC_ACCESS)) {
554 result |= PRSFS_READ | PRSFS_WRITE | PRSFS_INSERT |
555 PRSFS_LOOKUP | PRSFS_DELETE | PRSFS_LOCK |
556 PRSFS_ADMINISTER;
557 }
558
559 if (rights & (GENERIC_READ_ACCESS|FILE_READ_DATA)) {
560 result |= PRSFS_LOOKUP;
561 if (flags & SEC_ACE_FLAG_OBJECT_INHERIT) {
562 result |= PRSFS_READ;
563 }
564 }
565
566 if (rights & (GENERIC_WRITE_ACCESS|FILE_WRITE_DATA)) {
567 result |= PRSFS_INSERT | PRSFS_DELETE;
568 if (flags & SEC_ACE_FLAG_OBJECT_INHERIT) {
569 result |= PRSFS_WRITE | PRSFS_LOCK;
570 }
571 }
572
573 return result;
574}
575
576static uint32_t nt_to_afs_file_rights(const char *filename, const struct security_ace *ace)
577{
578 uint32_t result = 0;
579 uint32_t rights = ace->access_mask;
580
581 if (rights & (GENERIC_READ_ACCESS|FILE_READ_DATA)) {
582 result |= PRSFS_READ;
583 }
584
585 if (rights & (GENERIC_WRITE_ACCESS|FILE_WRITE_DATA)) {
586 result |= PRSFS_WRITE | PRSFS_LOCK;
587 }
588
589 return result;
590}
591
592static size_t afs_to_nt_acl_common(struct afs_acl *afs_acl,
593 SMB_STRUCT_STAT *psbuf,
594 uint32_t security_info,
595 TALLOC_CTX *mem_ctx,
596 struct security_descriptor **ppdesc)
597{
598 struct security_ace *nt_ace_list;
599 struct dom_sid owner_sid, group_sid;
600 struct security_acl *psa = NULL;
601 int good_aces;
602 size_t sd_size;
603
604 struct afs_ace *afs_ace;
605
606 uid_to_sid(&owner_sid, psbuf->st_ex_uid);
607 gid_to_sid(&group_sid, psbuf->st_ex_gid);
608
609 if (afs_acl->num_aces) {
610 nt_ace_list = talloc_array(mem_ctx, struct security_ace, afs_acl->num_aces);
611
612 if (nt_ace_list == NULL)
613 return 0;
614 } else {
615 nt_ace_list = NULL;
616 }
617
618 afs_ace = afs_acl->acelist;
619 good_aces = 0;
620
621 while (afs_ace != NULL) {
622 uint32_t nt_rights;
623 uint8_t flag = SEC_ACE_FLAG_OBJECT_INHERIT |
624 SEC_ACE_FLAG_CONTAINER_INHERIT;
625
626 if (afs_ace->type == SID_NAME_UNKNOWN) {
627 DEBUG(10, ("Ignoring unknown name %s\n",
628 afs_ace->name));
629 afs_ace = afs_ace->next;
630 continue;
631 }
632
633 if (S_ISDIR(psbuf->st_ex_mode))
634 afs_to_nt_dir_rights(afs_ace->rights, &nt_rights,
635 &flag);
636 else
637 nt_rights = afs_to_nt_file_rights(afs_ace->rights);
638
639 init_sec_ace(&nt_ace_list[good_aces++], &(afs_ace->sid),
640 SEC_ACE_TYPE_ACCESS_ALLOWED, nt_rights, flag);
641 afs_ace = afs_ace->next;
642 }
643
644 psa = make_sec_acl(mem_ctx, NT4_ACL_REVISION,
645 good_aces, nt_ace_list);
646 if (psa == NULL)
647 return 0;
648
649 *ppdesc = make_sec_desc(mem_ctx, SD_REVISION,
650 SEC_DESC_SELF_RELATIVE,
651 (security_info & SECINFO_OWNER)
652 ? &owner_sid : NULL,
653 (security_info & SECINFO_GROUP)
654 ? &group_sid : NULL,
655 NULL, psa, &sd_size);
656
657 return sd_size;
658}
659
660static size_t afs_to_nt_acl(struct afs_acl *afs_acl,
661 struct connection_struct *conn,
662 struct smb_filename *smb_fname,
663 uint32_t security_info,
664 TALLOC_CTX *mem_ctx,
665 struct security_descriptor **ppdesc)
666{
667 int ret;
668
669 /* Get the stat struct for the owner info. */
670 if (lp_posix_pathnames()) {
671 ret = SMB_VFS_LSTAT(conn, smb_fname);
672 } else {
673 ret = SMB_VFS_STAT(conn, smb_fname);
674 }
675 if (ret == -1) {
676 return 0;
677 }
678
679 return afs_to_nt_acl_common(afs_acl, &smb_fname->st, security_info,
680 mem_ctx, ppdesc);
681}
682
683static size_t afs_fto_nt_acl(struct afs_acl *afs_acl,
684 struct files_struct *fsp,
685 uint32_t security_info,
686 TALLOC_CTX *mem_ctx,
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, mem_ctx, 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,
702 mem_ctx, ppdesc);
703}
704
705static bool mappable_sid(const struct dom_sid *sid)
706{
707 struct dom_sid domain_sid;
708
709 if (dom_sid_compare(sid, &global_sid_Builtin_Administrators) == 0)
710 return true;
711
712 if (dom_sid_compare(sid, &global_sid_World) == 0)
713 return true;
714
715 if (dom_sid_compare(sid, &global_sid_Authenticated_Users) == 0)
716 return true;
717
718 if (dom_sid_compare(sid, &global_sid_Builtin_Backup_Operators) == 0)
719 return true;
720
721 string_to_sid(&domain_sid, "S-1-5-21");
722
723 if (sid_compare_domain(sid, &domain_sid) == 0)
724 return true;
725
726 return false;
727}
728
729static bool nt_to_afs_acl(const char *filename,
730 uint32_t security_info_sent,
731 const struct security_descriptor *psd,
732 uint32_t (*nt_to_afs_rights)(const char *filename,
733 const struct security_ace *ace),
734 struct afs_acl *afs_acl)
735{
736 const struct security_acl *dacl;
737 int i;
738
739 /* Currently we *only* look at the dacl */
740
741 if (((security_info_sent & SECINFO_DACL) == 0) ||
742 (psd->dacl == NULL))
743 return true;
744
745 if (!init_afs_acl(afs_acl))
746 return false;
747
748 dacl = psd->dacl;
749
750 for (i = 0; i < dacl->num_aces; i++) {
751 const struct security_ace *ace = &(dacl->aces[i]);
752 const char *dom_name, *name;
753 enum lsa_SidType name_type;
754 char *p;
755
756 if (ace->type != SEC_ACE_TYPE_ACCESS_ALLOWED) {
757 /* First cut: Only positive ACEs */
758 return false;
759 }
760
761 if (!mappable_sid(&ace->trustee)) {
762 DEBUG(10, ("Ignoring unmappable SID %s\n",
763 sid_string_dbg(&ace->trustee)));
764 continue;
765 }
766
767 if (dom_sid_compare(&ace->trustee,
768 &global_sid_Builtin_Administrators) == 0) {
769
770 name = "system:administrators";
771
772 } else if (dom_sid_compare(&ace->trustee,
773 &global_sid_World) == 0) {
774
775 name = "system:anyuser";
776
777 } else if (dom_sid_compare(&ace->trustee,
778 &global_sid_Authenticated_Users) == 0) {
779
780 name = "system:authuser";
781
782 } else if (dom_sid_compare(&ace->trustee,
783 &global_sid_Builtin_Backup_Operators)
784 == 0) {
785
786 name = "system:backup";
787
788 } else {
789
790 if (!lookup_sid(talloc_tos(), &ace->trustee,
791 &dom_name, &name, &name_type)) {
792 DEBUG(1, ("AFSACL: Could not lookup SID %s on file %s\n",
793 sid_string_dbg(&ace->trustee),
794 filename));
795 continue;
796 }
797
798 if ( (name_type == SID_NAME_USER) ||
799 (name_type == SID_NAME_DOM_GRP) ||
800 (name_type == SID_NAME_ALIAS) ) {
801 char *tmp;
802 tmp = talloc_asprintf(talloc_tos(), "%s%s%s",
803 dom_name, lp_winbind_separator(),
804 name);
805 if (tmp == NULL) {
806 return false;
807 }
808 if (!strlower_m(tmp)) {
809 return false;
810 }
811 name = tmp;
812 }
813
814 if (sidpts) {
815 /* Expect all users/groups in pts as SIDs */
816 name = talloc_strdup(
817 talloc_tos(),
818 sid_string_tos(&ace->trustee));
819 if (name == NULL) {
820 return false;
821 }
822 }
823 }
824
825 while ((p = strchr_m(name, ' ')) != NULL)
826 *p = space_replacement;
827
828 add_afs_ace(afs_acl, true, name,
829 nt_to_afs_rights(filename, ace));
830 }
831
832 return true;
833}
834
835static bool afs_get_afs_acl(const char *filename, struct afs_acl *acl)
836{
837 struct afs_iob iob;
838
839 int ret;
840
841 char space[MAXSIZE];
842
843 DEBUG(5, ("afs_get_afs_acl: %s\n", filename));
844
845 iob.in_size = 0;
846 iob.out_size = MAXSIZE;
847 iob.in = iob.out = space;
848
849 ret = afs_syscall(AFSCALL_PIOCTL, filename, VIOCGETAL,
850 (char *)&iob, 0);
851
852 if (ret) {
853 DEBUG(1, ("got error from PIOCTL: %d\n", ret));
854 return false;
855 }
856
857 if (!init_afs_acl(acl))
858 return false;
859
860 if (!parse_afs_acl(acl, space)) {
861 DEBUG(1, ("Could not parse AFS acl\n"));
862 free_afs_acl(acl);
863 return false;
864 }
865
866 return true;
867}
868
869/* For setting an AFS ACL we have to take care of the ACEs we could
870 * not properly map to SIDs. Merge all of them into the new ACL. */
871
872static void merge_unknown_aces(struct afs_acl *src, struct afs_acl *dst)
873{
874 struct afs_ace *ace;
875
876 for (ace = src->acelist; ace != NULL; ace = ace->next)
877 {
878 struct afs_ace *copy;
879
880 if (ace->type != SID_NAME_UNKNOWN) {
881 DEBUG(10, ("Not merging known ACE for %s\n",
882 ace->name));
883 continue;
884 }
885
886 DEBUG(10, ("Merging unknown ACE for %s\n", ace->name));
887
888 copy = clone_afs_ace(dst->ctx, ace);
889
890 if (copy == NULL) {
891 DEBUG(0, ("Could not clone ACE for %s\n", ace->name));
892 continue;
893 }
894
895 copy->next = dst->acelist;
896 dst->acelist = copy;
897 dst->num_aces += 1;
898 }
899}
900
901static NTSTATUS afs_set_nt_acl(vfs_handle_struct *handle, files_struct *fsp,
902 uint32_t security_info_sent,
903 const struct security_descriptor *psd)
904{
905 struct afs_acl old_afs_acl, new_afs_acl;
906 struct afs_acl dir_acl, file_acl;
907 char acl_string[MAXSIZE];
908 struct afs_iob iob;
909 int ret = -1;
910 char *name = NULL;
911 const char *fileacls;
912
913 fileacls = lp_parm_const_string(SNUM(handle->conn), "afsacl", "fileacls",
914 "yes");
915
916 sidpts = lp_parm_bool(SNUM(handle->conn), "afsacl", "sidpts", false);
917
918 ZERO_STRUCT(old_afs_acl);
919 ZERO_STRUCT(new_afs_acl);
920 ZERO_STRUCT(dir_acl);
921 ZERO_STRUCT(file_acl);
922
923 name = talloc_strdup(talloc_tos(), fsp->fsp_name->base_name);
924 if (!name) {
925 return NT_STATUS_NO_MEMORY;
926 }
927
928 if (!fsp->is_directory) {
929 /* We need to get the name of the directory containing the
930 * file, this is where the AFS acls live */
931 char *p = strrchr(name, '/');
932 if (p != NULL) {
933 *p = '\0';
934 } else {
935 name = talloc_strdup(talloc_tos(), ".");
936 if (!name) {
937 return NT_STATUS_NO_MEMORY;
938 }
939 }
940 }
941
942 if (!afs_get_afs_acl(name, &old_afs_acl)) {
943 DEBUG(3, ("Could not get old ACL of %s\n", fsp_str_dbg(fsp)));
944 goto done;
945 }
946
947 split_afs_acl(&old_afs_acl, &dir_acl, &file_acl);
948
949 if (fsp->is_directory) {
950
951 if (!strequal(fileacls, "yes")) {
952 /* Throw away file acls, we depend on the
953 * inheritance ACEs that also give us file
954 * permissions */
955 free_afs_acl(&file_acl);
956 }
957
958 free_afs_acl(&dir_acl);
959 if (!nt_to_afs_acl(fsp->fsp_name->base_name,
960 security_info_sent, psd,
961 nt_to_afs_dir_rights, &dir_acl))
962 goto done;
963 } else {
964 if (strequal(fileacls, "no")) {
965 ret = -1;
966 goto done;
967 }
968
969 if (strequal(fileacls, "ignore")) {
970 ret = 0;
971 goto done;
972 }
973
974 free_afs_acl(&file_acl);
975 if (!nt_to_afs_acl(fsp->fsp_name->base_name,
976 security_info_sent, psd,
977 nt_to_afs_file_rights, &file_acl))
978 goto done;
979 }
980
981 merge_afs_acls(&dir_acl, &file_acl, &new_afs_acl);
982
983 merge_unknown_aces(&old_afs_acl, &new_afs_acl);
984
985 unparse_afs_acl(&new_afs_acl, acl_string);
986
987 iob.in = acl_string;
988 iob.in_size = 1+strlen(iob.in);
989 iob.out = NULL;
990 iob.out_size = 0;
991
992 DEBUG(10, ("trying to set acl '%s' on file %s\n", iob.in, name));
993
994 ret = afs_syscall(AFSCALL_PIOCTL, name, VIOCSETAL, (char *)&iob, 0);
995
996 if (ret != 0) {
997 DEBUG(10, ("VIOCSETAL returned %d\n", ret));
998 }
999
1000 done:
1001 free_afs_acl(&dir_acl);
1002 free_afs_acl(&file_acl);
1003 free_afs_acl(&old_afs_acl);
1004 free_afs_acl(&new_afs_acl);
1005
1006 return (ret == 0) ? NT_STATUS_OK : NT_STATUS_ACCESS_DENIED;
1007}
1008
1009static NTSTATUS afsacl_fget_nt_acl(struct vfs_handle_struct *handle,
1010 struct files_struct *fsp,
1011 uint32_t security_info,
1012 TALLOC_CTX *mem_ctx,
1013 struct security_descriptor **ppdesc)
1014{
1015 struct afs_acl acl;
1016 size_t sd_size;
1017
1018 DEBUG(5, ("afsacl_fget_nt_acl: %s\n", fsp_str_dbg(fsp)));
1019
1020 sidpts = lp_parm_bool(SNUM(fsp->conn), "afsacl", "sidpts", false);
1021
1022 if (!afs_get_afs_acl(fsp->fsp_name->base_name, &acl)) {
1023 return NT_STATUS_ACCESS_DENIED;
1024 }
1025
1026 sd_size = afs_fto_nt_acl(&acl, fsp, security_info, mem_ctx, ppdesc);
1027
1028 free_afs_acl(&acl);
1029
1030 return (sd_size != 0) ? NT_STATUS_OK : NT_STATUS_ACCESS_DENIED;
1031}
1032
1033static NTSTATUS afsacl_get_nt_acl(struct vfs_handle_struct *handle,
1034 const char *name, uint32_t security_info,
1035 TALLOC_CTX *mem_ctx,
1036 struct security_descriptor **ppdesc)
1037{
1038 struct afs_acl acl;
1039 size_t sd_size;
1040 struct smb_filename *smb_fname = NULL;
1041
1042 DEBUG(5, ("afsacl_get_nt_acl: %s\n", name));
1043
1044 sidpts = lp_parm_bool(SNUM(handle->conn), "afsacl", "sidpts", false);
1045
1046 if (!afs_get_afs_acl(name, &acl)) {
1047 return NT_STATUS_ACCESS_DENIED;
1048 }
1049
1050 smb_fname = synthetic_smb_fname(talloc_tos(), name, NULL, NULL);
1051 if (smb_fname == NULL) {
1052 free_afs_acl(&acl);
1053 return NT_STATUS_NO_MEMORY;
1054 }
1055
1056 sd_size = afs_to_nt_acl(&acl, handle->conn, smb_fname, security_info,
1057 mem_ctx, ppdesc);
1058 TALLOC_FREE(smb_fname);
1059
1060 free_afs_acl(&acl);
1061
1062 return (sd_size != 0) ? NT_STATUS_OK : NT_STATUS_ACCESS_DENIED;
1063}
1064
1065static NTSTATUS afsacl_fset_nt_acl(vfs_handle_struct *handle,
1066 files_struct *fsp,
1067 uint32_t security_info_sent,
1068 const struct security_descriptor *psd)
1069{
1070 return afs_set_nt_acl(handle, fsp, security_info_sent, psd);
1071}
1072
1073static int afsacl_connect(vfs_handle_struct *handle,
1074 const char *service,
1075 const char *user)
1076{
1077 const char *spc;
1078 int ret = SMB_VFS_NEXT_CONNECT(handle, service, user);
1079
1080 if (ret < 0) {
1081 return ret;
1082 }
1083
1084 spc = lp_parm_const_string(SNUM(handle->conn), "afsacl", "space", "%");
1085
1086 if (spc != NULL)
1087 space_replacement = spc[0];
1088
1089 return 0;
1090}
1091
1092/* We don't have a linear form of the AFS ACL yet */
1093static int afsacl_sys_acl_blob_get_file(vfs_handle_struct *handle, const char *path_p, TALLOC_CTX *mem_ctx, char **blob_description, DATA_BLOB *blob)
1094{
1095 errno = ENOSYS;
1096 return -1;
1097}
1098
1099/* We don't have a linear form of the AFS ACL yet */
1100static int afsacl_sys_acl_blob_get_fd(vfs_handle_struct *handle, files_struct *fsp, TALLOC_CTX *mem_ctx, char **blob_description, DATA_BLOB *blob)
1101{
1102 errno = ENOSYS;
1103 return -1;
1104}
1105
1106static struct vfs_fn_pointers vfs_afsacl_fns = {
1107 .connect_fn = afsacl_connect,
1108 .fget_nt_acl_fn = afsacl_fget_nt_acl,
1109 .get_nt_acl_fn = afsacl_get_nt_acl,
1110 .fset_nt_acl_fn = afsacl_fset_nt_acl,
1111 .sys_acl_blob_get_file_fn = afsacl_sys_acl_blob_get_file,
1112 .sys_acl_blob_get_fd_fn = afsacl_sys_acl_blob_get_fd
1113};
1114
1115NTSTATUS vfs_afsacl_init(void);
1116NTSTATUS vfs_afsacl_init(void)
1117{
1118 return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "afsacl",
1119 &vfs_afsacl_fns);
1120}
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